method, user equipment and base station to transmit and receive random access channel

专利摘要:
the present disclosure provides a method for transmitting a random access channel (crack) via an eu in a wireless communication system. in particular, the method includes receiving information about actually transmitted sync signal blocks (ssbs) and rach configuration information about rach resources and transmitting a rach to at least one rach resource among rach resources mapped to actually transmitted ssbs based on in information about actually transmitted ssbs and in rach configuration information, where transmitted ssbs are actually mapped repeatedly to rach resources by a positive integer multiple of the number of ssbs actually transmitted in a rach configuration period based on information from rach configuration.
公开号:BR112019009899A2
申请号:R112019009899
申请日:2018-05-03
公开日:2020-04-22
发明作者:Kim Eunsun；Ko Hyunsoo；Kim Kijun；Yoon Sukhyon
申请人:Lg Electronics Inc；
IPC主号:

专利说明:

“METHOD, USER EQUIPMENT AND BASE STATION TO TRANSMIT AND RECEIVE RANDOM ACCESS CHANNEL”
TECHNICAL FIELD [001] The present disclosure concerns a method for transmitting and receiving a random access channel and an apparatus for doing so, and more specifically a method for transmitting and receiving a random access channel by means of channel resources. random access corresponding to sync signal blocks when mapping sync signal blocks to resources for random access channels, and a device for that.
PREVIOUS TECHNIQUE [002] As more and more communication devices demand increased communication traffic along with current trends, a future generation fifth generation (5G) system is required to provide enhanced wireless broadband communication when compared to legacy LTE system. In the future generation 5G system, communication scenarios are divided into enhanced mobile broadband (eMBB), highly reliable and low latency communication (URLLC), massive machine type communication (mMTC) and so on.
[003] In this document, eMBB is a future generation mobile communication scenario characterized by high spectral efficiency, high data rate experienced by the user and high peak data rate, URLLC is a future generation mobile communication scenario characterized by reliability ultra-high, ultra-low latency and ultra-high availability (eg vehicle for everything (V2X), emergency service and remote control), and mMTC is a future generation mobile communication scenario characterized by low cost, low energy, package small and massive connectivity (eg Internet of things (loT)).
REVELATION
Technical problem
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2/113 [004] An objective of the present disclosure is to provide a method for transmitting and receiving a random access channel and an apparatus for doing so.
[005] It will be understood by those skilled in the art that the objectives that can be achieved with the present disclosure are not limited to what was previously described in a particular way and those mentioned above and other objectives that the present revelation can achieve will be understood more clearly from detailed description below.
Technical Solution [006] A method for transmitting a random access channel (RACH) over a UE in a wireless communication system according to one embodiment of the present disclosure includes: receiving information about synchronization signal blocks (SSBs) actually transmitted and RACH configuration information regarding RACH resources; and transmit a RACH on at least one RACH resource among RACH resources mapped to actually transmitted SSBs based on information about actually transmitted SSBs and RACH configuration information, where transmitted SSBs are actually repeatedly mapped to RACH resources by a number positive integer multiple of the number of SSBs actually transmitted in a RACH configuration period based on the RACH configuration information.
[007] Here, RACH resources remaining after repeated mapping by the positive integer multiple of the number of SSBs actually transmitted may not be mapped to the SSBs actually transmitted.
[008] In addition, an uplink signal other than RACH can be transmitted or a downlink signal can be received on RACH resources that are not mapped to the SSBs actually transmitted.
[009] In addition, when the number of SSBs that can be mapped by RACH resource is less than 1, one SSB can be mapped to as many RACH resources
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3/113 consecutive as a reciprocal of the number of SSBs that can be mapped by RACH resource.
[010] A UE transmitting a random access channel (RACH) in a wireless communication system in accordance with the present disclosure includes: a transceiver for transmitting / receiving radio signals to / from a base station; and a processor connected to the transceiver and configured to control the transceiver, where the processor controls the transceiver to receive information about actually transmitted sync signal blocks (SSBs) and RACH configuration information about RACH resources and controls the transceiver to transmit a RACH on at least one RACH resource among RACH resources mapped to actually transmitted SSBs based on information about actually transmitted SSBs and RACH configuration information, where transmitted SSBs are actually repeatedly mapped to RACH resources by a number positive integer multiple of the number of SSBs actually transmitted in a RACH configuration period based on the RACH configuration information.
[011] Here, RACH resources remaining after repeated mapping by the positive integer multiple of the number of SSBs actually transmitted may not be mapped to the SSBs actually transmitted.
[012] In addition, an up link signal other than RACH can be transmitted or a down link signal can be received on RACH resources that are not mapped to the actually transmitted SSBs.
[013] In addition, when the number of SSBs that can be mapped by RACH resource is less than 1, an SSB can be mapped to as many consecutive RACH resources as a reciprocal of the number of SSBs that can be mapped by RACH resource.
[014] A method for receiving a random access channel (RACH) through a base station in a wireless communication system according to a modality
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4/113 of the present disclosure includes: transmitting information about actually transmitted sync signal blocks (SSBs) and RACH configuration information about RACH resources; and perform RACH reception on RACH resources mapped to actually transmitted SSBs based on information about actually transmitted SSBs and RACH configuration information, where transmitted SSBs are actually repeatedly mapped to RACH resources by a positive integer multiple of the number of the SSBs actually transmitted in a RACH configuration period based on the RACH configuration information.
[015] Here, information about a transmitted SSB actually corresponding to the intended synchronization to be acquired by a UE that has transmitted the RACH can be acquired based on a RACH resource on which the RACH was received.
[016] A base station receiving a random access channel (RACH) in a wireless communication system in accordance with the present disclosure includes: a transceiver for transmitting / receiving radio signals to / from a UE; and a processor connected to the transceiver and configured to control the transceiver, where the processor controls the transceiver to transmit information about actually transmitted sync signal blocks (SSBs) and RACH configuration information about RACH resources and controls the transceiver to perform RACH reception on RACH resources mapped to actually transmitted SSBs based on information about actually transmitted SSBs and RACH configuration information, where transmitted SSBs are actually repeatedly mapped to RACH resources by a positive integer multiple of the number of the SSBs actually transmitted in a RACH configuration period based on the RACH configuration information.
Advantageous Effects [017] According to the present disclosure, it is possible to perform a
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5/113 efficient initial access procedure when mapping resources for random access channels to the sync signal blocks and transmitting / receiving other signals through resources for random access channels that are not mapped to the sync signal blocks.
[018] It will be appreciated by those skilled in the art that the effects that can be achieved with the present disclosure are not limited to what has been described particularly above and other advantages of the present disclosure will be understood more clearly from the detailed description below considered together with the attached drawings.
DESCRIPTION OF THE DRAWINGS [019] The accompanying drawings, which are included to provide an additional understanding of the present disclosure and are incorporated into this document and form a part of this specification, illustrate modalities of the present disclosure and together with the description serve to explain the principles of the present revelation.
[020] Figure 1 illustrates a random access preamble format in LTE / LTE-A.
[021] Figure 2 illustrates an interval structure usable in new radio access technology (NR).
[022] Figure 3 illustrates in an abstract way a hybrid beam formation structure from the point of view of a transceiver unit (TXRII) and a physical antenna [023] Figure 4 illustrates a new access technology cell radio (NR).
[024] Figure 5 illustrates transmission of SS blocks and RACH resources connected to SS blocks.
[025] Figure 6 illustrates a configuration / format of a random access channel preamble (RACH) and a receiver function.
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6/113 [026] Figure 7 illustrates reception beams (Rx) formed in a gNB to receive a RACH preamble.
[027] Figure 8 is a diagram to describe terms used in describing the present disclosure in relation to RACH signals and RACH resources.
[028] Figure 9 illustrates a set of RACH resources.
[029] Figure 10 is a diagram to describe the present disclosure in relation to RACH resource limit alignment.
[030] Figure 11 illustrates a method of configuring a mini-interval in an INTERVALOrach interval for a RACH when BC is effective.
[031] Figure 12 illustrates another method of configuring a mini-interval in an INTERVALOrach interval for a RACH when BC is effective.
[032] Figure 13 illustrates a method of configuring a mini-interval in an INTERVALOrach interval for a RACH when BC is not effective.
[033] Figure 14 illustrates a method of setting up a mini-interval using a safety time.
[034] Figure 15 illustrates an example of concatenating mini-intervals in the same length as a normal interval with an effective BC to transmit data.
[035] Figures 16 to 28 illustrate modalities regarding a method of configuring RACH resources and a method of allocating RACH resources.
[036] Figure 29 is a block diagram illustrating components of a transmitter 10 and a receiver 20 carrying out the present disclosure.
BEST MODE [037] Reference will now be made in detail to the exemplary modalities of the present invention, examples of which are illustrated in the accompanying drawings. The detailed description, which will be given below with reference to the accompanying drawings, is made to explain exemplary modalities of the present invention, instead of showing the only modalities that can be implemented
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7/113 according to the invention. The following detailed description includes specific details in order to provide a complete understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without such specific details.
[038] In some instances, known structures and devices are omitted or shown in the form of a block diagram, focusing on important features of the structures and devices, in order not to obscure the concept of the present invention. The same reference numbers will be used throughout this specification to refer to the same or similar parts.
[039] The techniques, devices and systems set out below can be applied to a variety of wireless multiple access systems. Examples of multiple access systems include a code division multiple access system (CDMA), a frequency division multiple access system (FDMA), a time division multiple access system (TDMA), an access system orthogonal frequency division multiple (OFDMA), a single carrier frequency division multiple access system (SC-FDMA) and a multiple carrier frequency division multiple access system (MC-FDMA). CDMA can be incorporated using radio technology such as universal terrestrial radio access (IITRA) or CDMA2000. TDMA can be incorporated through radio technology such as global system for mobile communications (GSM), general packet radio service (GPRS) or enhanced data rates for GSM evolution (EDGE). OFDMA can be incorporated through radio technology such as 802.11 (Wi-Fi), IEEE 802.16 (WiMAX) and IEEE 802.20 from the Institute of Electrical and Electronic Engineers (IEEE), or Evolved IITRA (E-LITRA). IITRA is a part of a universal mobile telecommunications system (IIMTS). Long term evolution (LTE) of third generation partnership project (3GPP) is a part of evolved IIMTS (E-LIMTS) using E-LITRA. LTE 3GPP employs OFDMA in DL and SC-FDMA
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8/113 in UL. LTE-advanced (LTE-A) is an evolved version of LTE 3GPP. For convenience of description, it is assumed that the present invention is applied to a 3GPP-based communication system, for example, LTE / LTE-A, NR. However, the technical resources of the present invention are not limited to this. For example, although the following detailed description is based on a mobile communication system corresponding to an LTE / LTE-A / NR 3GPP system, aspects of the present invention that are not specific to LTE / LTE-A / NR 3GPP are applicable to other mobile communications systems.
[040] For example, the present invention is applicable for contention-based communication such as Wi-Fi as well as non-contention-based communication such as in the LTE / LTE-A 3GPP system in which an eNB allocates a DL time / frequency resource / UL for a UE and the UE receives a DL signal and transmits a UL signal according to the resource allocation of the eNB. In a non-contention-based communication scheme, an access point (AP) or a control node to control the AP allocates a resource for communication between the UE and the AP, while in a contention-based communication scheme a resource of communication is occupied by means of contention between UEs that wish to access the AP. The contention-based communication scheme will now be briefly described. One type of contention-based communication scheme is multiple access with carrier detection (CSMA). CSMA refers to a probabilistic media access control (MAC) protocol to confirm, before a node or communication device transmits traffic on a shared transmission medium (also called a shared channel) such as a frequency band, that there is no other traffic on the same shared transmission medium. In CSMA, a transmitting device determines whether another transmission is being performed before attempting to transmit traffic to a receiving device. In other words, the transmission device tries to
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9/113 detects the presence of a carrier from another transmission device before attempting to perform transmission. Upon detecting the carrier, the transmission device waits for another transmission device that is performing transmission to finish transmitting, before executing transmission of the same. Consequently, CSMA can be a communication scheme based on the principle of “detect before transmitting” or “listening before speaking”. A scheme to avoid collision between transmission devices in the contention-based communication system using CSMA includes multiple access with collision detection carrier (CSMA / CD) and / or multiple access with collision prevention carrier detection (CSMA / HERE). CSMA / CD is a collision detection scheme in a wired local area network (LAN) environment. In CSMA / CD, a personal computer (PC) or a server that wants to perform communication in an Ethernet environment first confirms that communication occurs on a network and, if another device carries data on the network, the PC or server waits and then transmits data. That is, when two or more users (for example, PCs, UEs, etc.) transmit data simultaneously, collision occurs between simultaneous transmission and CSMA / CD is a scheme for transmitting data flexibly when monitoring collision. A transmission device using CSMA / CD adjusts data transmission from the same when detecting data transmission performed by another device using a specific rule. CSMA / CA is a MAC protocol specified in the IEEE 802.11 standards. A wireless LAN (WLAN) system complying with IEEE 802.11 standards does not use CSMA / CD that has been used in IEEE 802.3 standards and uses CA, that is, a collision avoidance scheme. Transmission devices always detect a network carrier and, if the network is empty, the transmission devices wait for a specified time according to their locations registered in a list and then transmit data. Various methods are used to determine the priority of transmission devices in the list and to reconfigure
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10/113 priority. In a system according to some versions of the IEEE 802.11 standards, collision may occur, in which case a collision detection procedure is performed. A transmission device using CSMA / CA prevents collision between data transmission from the same and data transmission from another transmission device using a specific rule.
[041] In embodiments of the present invention described below, the term "assume" can mean that a person to transmit a channel transmits the channel according to the corresponding "assumption". This can also mean that a person to receive the channel receives or decodes the channel in a form in accordance with the "assumption", on the assumption that the channel was transmitted according to the "assumption".
[042] In the present invention, suppression of bits of a channel in a specific resource means that the channel signal is mapped to the specific resource in the channel resource mapping procedure, but a part of the signal mapped to the resource with suppression of channel bits is excluded when transmitting the channel. In other words, the specific resource that is bit suppressed is counted as a resource for the channel in the channel's resource mapping procedure, and a signal mapped to the specific resource among the channel's signals is not actually transmitted. The channel receiver receives, demodulates or decodes the channel, assuming that the signal mapped to the specific resource is not transmitted. On the other hand, matching a channel's rate to a specific resource means that the channel is never mapped to the specific resource in the channel's resource mapping procedure, so the specific resource is not used for channel transmission. In other words, the matched rate resource is not counted as a resource for the channel in the channel resource mapping procedure. The channel receiver receives, demodulates or decodes the channel, assuming that the specific matched rate feature is not used for channel mapping and transmission.
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11/113 [043] In the present invention, a user equipment (UE) can be a fixed or mobile device. Examples of the UE include various devices that transmit and receive user data and / or various types of control information to and from a base station (BS). The UE can be referred to as a terminal equipment (TE), a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, a digital assistant (PDA), a wireless modem, a portable device, etc. Furthermore, in the present invention, a BS generally refers to a fixed station that performs communication with a UE and / or with another BS, and exchanges various types of data and control information with the UE and with a another BS. BS can be referred to as an advanced base station (ABS), a B node (NB), an evolved B node (eNB), a base transceiver system (BTS), an access point (AP), a processing server (PS), etc. In particular, a BS from a UTRAN is referred to as a Node B, a BS from an E-UTRAN is referred to as an eNB, and a BS from a new radio access technology network is referred to as a gNB. In describing the present invention, a BS will be referred to as a gNB.
[044] In the present invention, a node refers to a fixed point capable of transmitting / receiving a radio signal by means of communication with a UE. Various types of gNBs can be used as nodes regardless of their names. For example, a BS, a B node (NB), an evolved B node (eNB), a picocell eNB (PeNB), a domestic eNB (HeNB), gNB, a retransmission, a repeater, etc. it may be a knot. Furthermore, the node may not be a gNB. For example, the node can be a remote radio head (RRH) or a remote radio unit (RRU). RRH or RRU in general has a lower power level than a gNB power level. Since RRH or RRU (then RRH / RRU) is generally connected to gNB via a dedicated line such as an optical cable, cooperative communication between RRH / RRU and gNB
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12/113 can be performed directly compared to cooperative communication between gNBs connected by a radio line. At least one antenna is installed per node. The antenna can mean a physical antenna or it can mean an antenna port or a virtual antenna.
[045] In the present invention, a cell refers to a prescribed geographical area for which one or more nodes provide a communication service. Therefore, in the present invention, communication with a specific cell can mean communication with a gNB or with a node that provides a communication service for the specific cell. Furthermore, a DL / LIL signal from a specific cell refers to a DL / LIL signal from / to a gNB or a node that provides a communication service for the specific cell. A node providing UL / DL communication services to a UE is called a server node and a cell for which UL / DL communication services are provided by the server node is called especially a server cell. In addition, channel status / quality of a specific cell refers to the channel status / quality of a channel or communication link formed between a gNB or node that provides a communication service for the specific cell and a UE. In the 3GPP-based communication system, the UE can measure DL channel status received from a specific node using specific cell reference signal (s) (CRS (s)) transmitted on a CRS resource and / or channel status information reference signal (s) (CSI-RS (s)) transmitted on a CSI-RS resource, allocated by the specific node's antenna port (s) to the specific node.
[046] However, a 3GPP-based communication system uses the concept of a cell in order to manage radio resources and a cell associated with radio resources is distinguished from a cell in a geographic region.
[047] A “cell” of a geographic region can be understood as a cover within which a node can provide service using a carrier and a
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13/113 “cell” of a radio resource is associated with bandwidth (BW) which is a frequency range configured by the carrier. Since DL coverage, which is a range within which the node is capable of transmitting a valid signal, and UL coverage, which is a range within which the node is capable of receiving a valid signal from the UE, depends on a carrier carrying the signal, node coverage can be associated with "cell" coverage of a radio resource used by the node. Therefore, the term “cell” can be used to indicate node service coverage at times, a radio resource at other times, or a range that a signal using a radio resource can reach with valid intensity at other times.
[048] However, 3GPP communication standards use the concept of a cell to manage radio resources. The “cell” associated with the radio resources is defined through a combination of down link resources and up link resources, that is, a combination of CC DL and CC UL. The cell can be configured only via downlink resources, or it can be configured through downlink resources and uplink resources. If carrier aggregation is supported, a link between a carrier frequency of the downlink resources (or CC DL) and a carrier frequency of the uplink resources (or CC UL) can be indicated by system information. For example, combination of DL resources and UL resources can be indicated by linkage of type 2 system information block (SIB2). The carrier frequency means a central frequency for each cell or DC. A cell operating on a primary frequency can be referred to as a primary cell (Pcell) or PCC, and a cell operating on a secondary frequency can be referred to as a secondary cell (Scell) or SCC. The carrier corresponding to Pcell on the downlink will be referred to as a primary CC on the downlink (PCC DL), and the carrier corresponding to Pcell on the downlink will be referred to as a primary CC on the downlink (PCC UL). A Scell means a cell that can be
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14/113 configured after completion of radio resource control (RRC) connection establishment and used to provide additional radio resources. Scell can form a set of server cells for the UE together with Pcell according to the capabilities of the UE. The carrier corresponding to Scell on the downlink will be referred to as the secondary CC of the downlink (SCC DL), and the carrier corresponding to Scell on the downlink will be referred to as the secondary CC of the downlink (SCC UL). Although the UE is in a connected RRC state, if it is not configured through carrier aggregation or does not support carrier aggregation, there is only a single server cell configured by Pcell.
[049] 3GPP-based communication standards define DL physical channels corresponding to resource elements carrying information derived from a higher layer and DL physical signals corresponding to resource elements that are used by a physical layer, but which do not carry information derived from a higher layer. For example, a physical downlink shared channel (PDSCH), a physical broadcast channel (PBCH), a physical multicast channel (PMCH), a physical control format indicator channel (PCFICH), a physical control channel Downlink link (PDCCH) and a hybrid ARQ indicator physical channel (PHICH) are defined as the physical DL channels, and a reference signal and a synchronization signal are defined as the physical DL signals. A reference signal (RS), also called a pilot, refers to a special waveform of a predefined signal known to both a BS and a UE. For example, a cell-specific RS (CRS), a UE-specific RS (UE-RS), a positioning RS (PRS) and RS channel status information (CSI-RS) can be defined as DL RSs. However, LTE / LTE-A 3GPP standards define physical UL channels corresponding to resource elements carrying information derived from a higher layer and physical UL signals corresponding to resource elements
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15/113 that are used by a physical layer, but that do not carry information derived from a higher layer. For example, a physical uphill link shared channel (PlISCH), an uphill link physical control channel (PlICCH) and a random access physical channel (PRACH) are defined as the UL physical channels, and a reference signal demodulation (RS DM) for a UL control / data signal and a probe reference signal (SRS) used for UL channel measurement are defined as physical UL signals.
[050] In the present invention, a physical downlink link control channel (PDCCH), a physical control format indicator channel (PCFICH), a physical channel indicating hybrid automatic retransmission request (PHICH) and a shared physical channel Downlink links (PDSCH) refer to a set of time-frequency resources or resource elements (REs) carrying downlink link control (DCI) information, a set of time-frequency resources or REs carrying an indicator control format (CFI), a set of time-frequency resources or REs carrying down-link confirmation (ACK) / negative ACK (NACK), and a set of time-frequency resources or REs carrying data link data descent, respectively. In addition, a physical uphill link control channel (PUCCH), a physical uphill link shared channel (PUSCH) and a physical random access channel (PRACH) refer to a set of time-frequency resources or REs carrying uphill link control (UCI) information, a set of time-frequency resources or REs carrying uphill link data and a set of time-frequency resources or ERs carrying random access signals, respectively. In the present invention, in particular, a time-frequency or RE resource that is assigned to or belongs to PDCCH / PCFICH / PHICH / PDSCH / PUCCH / PUSCH / PRACH is referred to as PDCCH / PCFICH / PHICH / PDSCH / PUCCH / RE PUSCH / PRACH or time feature
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16/113 frequency of PDCCH / PCFICH / PHICH / PDSCH / PUCCH / PUSCH / PRACH, respectively. Therefore, in the present invention, PUCCH / PUSCH / PRACH transmission from a UE is conceptually identical to the transmission of UCI / uphill link data / random access signal in PUSCH / PUCCH / PRACH, respectively. Furthermore, the PDCCH / PCFICH / PHICH / PDSCH transmission of a gNB is conceptually identical to the downlink / DCI data transmission in PDCCH / PCFICH / PHICH / PDSCH, respectively.
[051] Next, the OFDM / subcarrier / RE symbol in or for which CRS / DMRS / CSI-RS / SRS / UE-RS / TRS is designated or configured will be referred to as the CRS / DMRS symbol / carrier / subcarrier / RE / CSI-RS / SRS / UE-RS / TRS. For example, an OFDM symbol on or for which a tracking RS (TRS) is assigned or configured is referred to as a TRS symbol, a subcarrier on or for which TRS is assigned or configured is referred to as a TRS subcarrier, and an RE on or for which the TRS is assigned or configured is referred to as an RE TRS. Furthermore, a subframe configured for transmission of the TRS is referred to as a TRS subframe. In addition, a subframe in which a broadcast signal is transmitted is referred to as a broadcast subframe or PBCH subframe and a subframe in which a synchronization signal (for example, PSS and / or SSS) is transmitted is referred to as a subframe synchronization signal or a PSS / SSS subframe. OFDM / subcarrier / RE symbol in or for which PSS / SSS is assigned or configured is referred to as PSS / SSS symbol / subcarrier / RE, respectively.
[052] In the present invention, a CRS port, an UE-RS port, a CSI-RS port and a TRS port refer to an antenna port configured to transmit a CRS, an antenna port configured to transmit an UE-RS , an antenna port configured to transmit a CSI-RS, and an antenna port
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17/113 configured to transmit a TRS, respectively. Antenna ports configured to transmit CRSs can be distinguished from each other by the locations of REs occupied by CRSs according to CRS ports, antenna ports configured to transmit UE-RSs can be distinguished from each other by the locations of REs occupied by UE-RSs according to UE-RS ports, and antenna ports configured to transmit CSI-RSs can be distinguished from each other by the locations of REs occupied by CSI-RSs according to CSIRS ports. Therefore, the term CRS / UE-RS / CSI-RS / TRS ports can also be used to indicate a pattern of REs occupied by CRSs / UE-RSs / CSI-RSs / TRSs in a predetermined resource region. In the present invention, both a DMRS and an UE-RS refer to RSs for demodulation and, therefore, the terms DMRS and UE-RS are used to refer to RSs for demodulation.
[053] For terms and technologies that are not described in detail in the present invention, reference can be made to the standard document of LTE / LTE-A 3GPP, for example, 3GPP TS 36.211, 3GPP TS 36.212, 3GPP TS 36.213, 3GPP TS 36.321 and 3GPP TS 36.331 and for the standard document of 3GPP NR, for example, 3GPP TS 38.211,3GPP TS 38.212, 3GPP 38.213, 3GPP 38.214, 3GPP 38.215, 3GPP TS 38.321 and 3GPP TS 36.331.
[054] In an LTE / LTE-A system, when a UE is turned on or wants to access a new cell, the UE performs an initial cell search procedure including acquiring time and frequency synchronization with the cell and detecting a cell identity of physical layer N ^cell iD of the cell. For this purpose, the UE can receive synchronization signals, for example, a primary synchronization signal (PSS) and a secondary synchronization signal (SSS), from an eNB to thus establish synchronization with the eNB and acquire information such as an identity cell (ID). After the initial cell search procedure, the UE can perform a random access procedure to complete access to the eNB. For this
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18/113 purpose, the UE can transmit a preamble by means of a physical random access channel (PRACH) and receive a response message to the preamble by means of a PDCCH and a PDSCH. After performing the procedures mentioned above, the UE can perform PDCCH / PDSCH reception and PUSCH / PUCCH transmission as a normal UL / DL transmission procedure. The random access procedure is also referred to as a random access channel (RACH) procedure. The random access procedure is used for a variety of purposes including initial access, UL synchronization adjustment, resource designation and transfer between cells.
[055] After transmitting the RACH preamble, the UE attempts to receive a random access response (RAR) within a predefined time window. Specifically, the UE attempts to detect a PDCCH with a temporary random access radio network identifier (RA-RNTI) (then PDCCH RA-RNTI) (for example, CRC is masked with RA-RNTI in the PDCCH) in the time. Upon detecting the PDCCH RA-RNTI, the UE checks the PDSCH corresponding to the PDCCH RARNTI for the presence of a RAR targeted for this. The RAR includes time advance information (TA) indicating time shift information for UL synchronization, UL resource allocation information (UL grant information) and a temporary UE identifier (for example, temporary cell RNTI (TC- RNTI)). The UE can perform UL transmission (for example, from Msg3) according to the resource allocation information and the TA value in the RAR. HARQ is applied for UL transmission corresponding to RAR. Therefore, after transmitting Msg3, the UE can receive confirmation information (for example, PHICH) corresponding to Msg3.
[056] Figure 1 illustrates a random access preamble format on a legacy LTE / LTE-A system.
[057] In the legacy LTE / LTE-A system, a preamble of random access, ie
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19/113 is, a RACH preamble, includes a cyclic prefix having a Tcp length and a sequence part having a Tseq length in a physical layer. The values of the Tcp and Tseq parameters are listed in the following table, and depend on the frame structure and the random access configuration. Higher layers control the preamble format. In the LTE / LTE-A 3GPP system, PRACH configuration information is signaled through system information and mobility control information for a cell. The PRACH configuration information indicates a root sequence index, a Ncs cyclic displacement unit of a Zadoff-Chu sequence, the length of the root sequence and a preamble format, which must be used for a RACH procedure in the cell. In the LTE / LTE-A 3GPP system, a PRACH opportunity, which is a time when the preamble format and the RACH preamble can be transmitted, is indicated by a PRACH configuration index, which is a part of the configuration information RACH (refer to Section 5.7 of 3GPP TS 36.211 and “PRACH-Config” of 3GPP TS 36.331). The length of the Zadoff-Chu sequence used for the RACH preamble is determined according to the preamble format (refer to Table 4)
Table 1
Preamble format Tcp Tseq 0 3168Ts 24576 Ts 1 21024Ts 24576 Ts 2 6240 Ts 2-24576Ts 3 21024Ts 2-24576Ts 4 448 Ts 4096 Ts
[058] In the LTE / LTE-A system, the RACH preamble is transmitted in a UL subframe. The transmission of a random access preamble is restricted to certain time and frequency resources. These resources are called PRACH resources, and are listed in ascending order of the number of subframes within the radio frame and of PRBs in the frequency domain such that index 0 corresponds to the PRB and subframe with the lowest numbers within the radio frame. Random access resources are defined according to the index of access
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20/113 PRACH configuration (refer to the 3GPP TS 36.211 standard document). The PRACH configuration index is given by a higher layer signal (transmitted by an eNB).
[059] The sequence part of the RACH preamble (then the preamble sequence) uses a Zadoff-Chu sequence. The preamble sequences for RACH are generated from the Zadoff-Chus sequence with zero correlation zone, generated from one or more root Zadoff-Chu sequences. The network configures the set of preamble strings that the UE can use. In the legacy LTE / LTE-A system, there are 64 preambles available in each cell. The set of 64 preamble sequences in a cell is discovered by first including, in the order of increasing cyclic displacement, all available cyclic displacements of a root Zadoff-Chu sequence with the logical index RACH_ROOT_SEQUENCE, where RACH_ROOT_SEQUENCE is diffused as part of the information of system. Additional preamble sequences, in the case that 64 preambles cannot be generated from a single root Zadoff-Chu sequence, are obtained from the root sequences with the consecutive logical indexes until all 64 sequences are discovered. The order of logical root sequence is cyclic: logical index 0 is consecutive to 837. The relationship between a logical root sequence index and physical root sequence index u is given in Table 2 and Table 3 for 0 ~ preamble formats 3 and 4, respectively.
Table 2
Logical root sequence number Physical root sequence number u (in ascending order of corresponding logical sequence number) 0-23 129, 710, 140, 699, 120, 719, 210, 629, 168, 671, 84, 755,105, 734, 93, 746, 70, 769, 60, 779, 2, 837, 1, 838 24-29 56, 783, 112, 727, 148, 691 30-35 80, 759, 42, 797, 40, 799 36-41 35, 804, 73, 766, 146, 693 42-51 31, 808, 28, 811, 30, 809, 27, 812, 29, 810 52-63 24, 815, 48, 791.68, 771, 74, 765, 178, 661, 136, 703 64-75 86, 753, 78, 761.43, 796, 39, 800, 20, 819, 21, 818
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76-89 95, 744, 202, 637, 190, 649, 181,658, 137, 702, 125, 714,151,688 90-115 217, 622, 128, 711, 142, 697, 122, 717, 203, 636, 118, 721, 110, 729, 89, 750, 103, 736, 61,778, 55, 784, 15, 824, 14, 825 116-135 12, 827, 23, 816, 34, 805, 37, 802, 46, 793, 207, 632, 179,660, 145, 694, 130, 709, 223, 616 136-167 228, 611,227, 612, 132, 707, 133, 706, 143, 696, 135, 704,161,678, 201,638, 173, 666, 106, 733, 83, 756, 91,748, 66,773, 53, 786, 10, 829, 9, 830 168-203 7, 832, 8, 831, 16, 823, 47, 792, 64, 775, 57, 782, 104, 735,101,738, 108, 731,208, 631, 184, 655, 197, 642, 191,648, 121, 718, 141,698, 149, 690, 216, 623, 218, 621 204-263 152, 687, 144, 695, 134, 705, 138, 701, 199, 640, 162, 677, 176, 663, 119, 720, 158, 681, 164, 675, 174, 665, 171,668, 170, 669, 87, 752, 169, 670, 88, 751, 107, 732, 81, 758, 82, 757, 100, 739, 98, 741, 71,768, 59, 780, 65, 774, 50, 789, 49, 790, 26, 813, 17, 822, 13, 826, 6, 833 264-327 5, 834, 33, 806, 51, 788, 75, 764, 99, 740, 96, 743, 97, 742, 166, 673, 172, 667, 175, 664, 187, 652, 163, 676, 185, 654,200, 639, 114, 725, 189, 650, 115, 724, 194, 645, 195, 644,192, 647, 182, 657, 157, 682, 156, 683, 211,628, 154, 685,123, 716, 139, 700, 212, 627, 153, 686, 213, 626, 215, 624,150, 689 328-383 225, 614, 224, 615, 221,618, 220, 619, 127, 712, 147, 692, 124, 715, 193, 646, 205, 634, 206, 633, 116, 723, 160, 679, 186, 653, 167, 672, 79, 760, 85, 754, 77, 762, 92, 747, 58, 781.62, 777, 69, 770, 54, 785, 36, 803, 32, 807, 25, 814, 18, 821, 11, 828, 4, 835 384-455 3, 836, 19, 820, 22, 817, 41,798, 38, 801, 44, 795, 52, 787,45, 794, 63, 776, 67, 772, 72, 767, 76, 763, 94, 745, 102, 737, 90, 749, 109, 730, 165, 674, 111, 728, 209, 630, 204, 635, 117, 722, 188, 651, 159, 680, 198, 641, 113, 726, 183, 656, 180, 659, 177, 662, 196, 643, 155, 684, 214, 625, 126, 713, 131, 708, 219, 620, 222, 617, 226, 613 456-513 230, 609, 232, 607, 262, 577, 252, 587, 418, 421, 416, 423,413, 426, 411,428, 376, 463, 395, 444, 283, 556, 285, 554,379, 460, 390, 449, 363, 476, 384, 455, 388, 451, 386, 453,361,478, 387, 452, 360, 479, 310, 529, 354, 485, 328, 511,315, 524, 337, 502, 349, 490, 335, 504, 324, 515 514-561 323, 516, 320, 519, 334, 505, 359, 480, 295, 544, 385, 454,292, 547, 291, 548, 381, 458, 399, 440, 380, 459, 397, 442,369, 470, 377, 462, 410, 429, 407, 432, 281,558, 414, 425,247, 592, 277, 562, 271, 568, 272, 567, 264, 575, 259, 580 562-629 237, 602, 239, 600, 244, 595, 243, 596, 275, 564, 278, 561,250, 589, 246, 593, 417, 422, 248, 591,394, 445, 393, 446,370, 469, 365, 474, 300, 539, 299, 540, 364, 475, 362, 477,298, 541, 312, 527, 313, 526, 314, 525, 353, 486, 352, 487,
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343, 496, 327, 512, 350, 489, 326, 513, 319, 520, 332, 507,333, 506, 348, 491, 347, 492, 322, 517 630-659 330, 509, 338, 501, 341,498, 340, 499, 342, 497, 301, 538,366, 473, 401,438, 371,468, 408, 431,375, 464, 249, 590,269, 570, 238, 601,234, 605 660-707 257, 582, 273, 566, 255, 584, 254, 585, 245, 594, 251, 588,412, 427, 372, 467, 282, 557, 403, 436, 396, 443, 392, 447,391,448, 382, 457, 389, 450, 294, 545, 297, 542, 311, 528,344, 495, 345, 494, 318, 521, 331, 508, 325, 514, 321, 518 708-729 346, 493, 339, 500, 351,488, 306, 533, 289, 550, 400, 439,378, 461, 374, 465, 415, 424, 270, 569, 241, 598 730-751 231,608, 260, 579, 268, 571,276, 563, 409, 430, 398, 441, 290, 549, 304, 535, 308, 531, 358, 481, 316, 523 752-765 293, 546, 288, 551,284, 555, 368, 471,253, 586, 256, 583,263, 576 766-777 242, 597, 274, 565, 402, 437, 383, 456, 357, 482, 329, 510 778-789 317, 522, 307, 532, 286, 553, 287, 552, 266, 573, 261, 578 790-795 236, 603, 303, 536, 356, 483 796-803 355, 484, 405, 434, 404, 435, 406, 433 804-809 235, 604, 267, 572, 302, 537 810-815 309, 530, 265, 574, 233, 606 816-819 367, 472, 296, 543 820-837 336, 503, 305, 534, 373, 466, 280, 559, 279, 560, 419, 420,240, 599, 258, 581,229, 610
Table 3
Logical root sequence number Physical root sequence number u(in ascending order of the corresponding logical sequence number) 0-19 1 138 2 137 3 136 4 135 5 134 6 133 7 132 8 131 9 130 10 129 20-39 11 128 12 127 13 126 14 125 15 124 16 123 17 122 18 121 19 120 20 119 40-59 21 118 22 117 23 116 24 115 25 114 26 113 27 112 28 111 28 110 30 109 60-79 31 108 32 107 33 106 34 105 35 104 36 103 37 102 38 101 39 100 40 99 80-99 41 98 42 97 43 96 44 95 45 94 46 93 47 92 48 91 49 90 50 89 100-119 51 88 52 87 53 86 54 85 55 84 56 83 57 82 58 81 59 80 60 79 120-137 61 78 62 77 63 76 64 75 65 74 66 73 67 72 68 71 69 70 -138-837 AT
[060] The root Zadoff-Chu sequence of order u is defined by the following equation.
[061] Equation 1
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23/113 .7nm (n + Y) x _u (n) - e ^Azc , 0 <n <N _zc -1
Table 4
Preamble format Nzc 0 ~ 3 839 4 139
[062] From the root Zadoff-Chu sequence of order u, random access preambles with zero correlation zones of length Nzc-1 are defined by cyclic shifts according to Xu, v (n) = x _u ((n + Cv) mod Nzc), where the cyclic shift is given by the following equation.
[063] Equation 2 ívA / x V · - 0,1 ... ,, 1 jVg _C / À ^f _fs j - 1. 0 for unrestricted sets
A '.- _s 0 for unrestricted sets i + (vnioti - 5èsi ⁺ “í for restricted sets [064] Ncs is given in Table 5 for preamble format 0 ~ 3 and in Table 6 for preamble format 4.
Table 5
zeroCorrelationZoneConfig Value N cs Unrestricted set Restricted set 0 0 15 1 13 18 2 15 22 3 18 26 4 22 32 5 26 38 6 32 46 7 38 55 8 46 68 9 59 82 10 76 100 11 93 128 12 119 158 13 167 202 14 279 237 15 419 -
Table 6
zeroCorrelationZoneConfig Ncs Value
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0 2 1 4 2 6 3 8 4 10 5 12 6 15 7 AT 8 AT 9 AT 10 AT 11 AT 12 AT 13 AT 14 AT 15 AT
[065] The zeroCorrelationZoneConfig parameter is provided by higher layers. The High-speed-flag parameter provided by higher layers determines whether to use an unrestricted set or a restricted set.
[066] The variable du is the cyclic shift corresponding to an effect
Magnitude 1 Doppler / Tseq and is given by the following equation.
[067] Equation 3

otherwise [068] P is the smallest non-negative integer that meets (pu) mod Nzc = 1. The parameters for restricted sets of cyclic displacements depend on du. For Nzc ^ du ^ Nzc / 3, the parameters are given by the following equation.
[069] Equation 4

[070] For Nzc / ^ 3du <(Nzc-Ncs) / 2, the parameters are given by the equation
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25/113 following.
[071] Equation 5 = L (Azc-2 <JM'cs.
= ^ -2 ^ + »“ A - [_dit / J
4t · ,.
/ 7 ^RA '* grnpo
- min ^ mâxjj ^ [072] For all other values of du, there are no cyclical shifts in the restricted set.
[073] The continuous random access signal at time s (t) which is the RACH baseband signal is defined by the following equation.
[074] Equation 6, 2mk
Nzc. _and .i2n (kap + K (kt _} + y [075] Where 0 <t <TsEQ-Tcp, 3prach is an amplitude scaling factor in order to comply with the transmission power specified in 3GPP TS
36,211, and ko = n ^RA pRBN ^RB sc - N ^ul rbN ^rb sc / 2. N ^rb sc denotes the number of subcarriers constituting a resource block (RB). N ^ul rb denotes the number of RBs in an UL interval and depends on a UL transmission bandwidth. The location in the frequency domain is controlled by the parameter ^ra prb which is derived from the section
5.7.1 of 3GPP TS 36.211. The K = Aí / Aíra factor considers the difference in subcarrier spacing between the preamble of random access and the transmission of uplink data. The variable Aíra, the subcarrier spacing for the random access preamble, and the variable φ, a fixed offset determining the domain location of the frequency of the random access preamble within the physical resource blocks, are both given by the following table.
[076] Table 7
Preamble format Aíra φ 0 ~ 3 1,250 Hz 7
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4 7,500 Hz 2
[077] In the LTE / LTE-A system, a Δί subcarrier spacing is 15 kHz or 7.5 kHz. However, as given in Table 7, an Aíra subcarrier spacing for a random access preamble is 1.25 kHz or 0.75 kHz.
[078] As more communication devices have demanded greater communication capacity, there is a need for improved mobile broadband in relation to legacy radio access technology (RAT). Furthermore, massive machine-type communication to provide various services regardless of time and place when connecting a plurality of devices and objects to each other is a major issue to be considered in future generation communication. Additionally, a communication system design in which services / UEs sensitive to reliability and latency are considered is under discussion. The introduction of future generation RAT has been discussed taking into account enhanced mobile broadband communication, massive MTC, very reliable and low latency communication (URLLC) and more. In the current 3GPP, a study of the future generation mobile communication system after EPC is being conducted. In the present invention, the corresponding technology is referred to as a new RAT (NR) or RAT 5G, for convenience.
[079] An NR communication system demands that performance far better than that of a legacy fourth generation (4G) system must be supported in terms of data rate, capacity, latency, energy consumption and cost. Therefore, the NR system needs to make progress in terms of bandwidth, spectrum, energy, signaling efficiency and cost per bit.
[080] OFDM numerology [081] The new RAT system uses an OFDM transmission scheme or a similar transmission scheme. The new RAT system can follow the OFDM parameters different from the OFDM parameters of the LTE system. Alternatively, the new
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27/113 RAT system may be in accordance with legacy LTE / LTE-A system numerology, but may have a wider system bandwidth (eg 100 MHz) than that of legacy LTE / LTE-A system. A cell can support a plurality of numerologies. That is, UEs that operate with different numerologies can coexist within a cell.
[082] Subframe Structure [083] In the LTE / LTE-A 3GPP system, the radio frame is 10 ms (307,200 T _s ) in duration. The radio board is divided into 10 subframes of equal size. Numbers of subframes can be assigned to the 10 subframes within a radio frame, respectively. Here, T _s denotes sampling time where Ts = 1 / (2048 * 15kHz). The basic unit of time for LTE is Ts. Each subframe is 1 ms long and is further divided into two intervals. 20 intervals are numbered sequentially from 0 to 19 on a radio board. Duration of each interval is 0.5 ms. A time interval in which a subframe is transmitted is defined as a transmission time interval (TTI). Time resources can be distinguished by a radio frame number (or radio frame index), a subframe number (or subframe index), an interval number (or interval index) and more. TTI refers to an interval over which data can be scaled. For example, in a current LTE / LTE-A system, a transmission opportunity from a UL concession or a DL concession is present every 1 ms and several transmission opportunities from the UL / DL concession are not present within a shorter time. than 1 ms. Therefore, the TTI in the legacy LTE / LTE-A system is 1 ms.
[084] Figure 2 illustrates an interval structure usable in a new radio access technology (NR).
[085] To minimize data transmission latency, in a new 5G RAT, an interval structure in which a control channel and a data channel
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11/28 are multiplexed by time division is considered.
[086] In figure 2, the hatched area represents the transmission region of a DL control channel (for example, PDCCH) carrying the DCI, and the dark area represents the transmission region of a UL control channel (for example, PUCCH) loading the UCI. Here, DCI is control information that gNB transmits to the UE. The DCI can include information regarding cell configuration that the UE must know, specific DL information such as DL scheduling, and specific UL information such as UL grant. The UCI is control information that the UE transmits to the gNB. The UCI may include a HARQ ACK / NACK report regarding DL data, a CSI report regarding DL channel status and an escalation request (SR).
[087] In figure 2, the symbol region from symbol index 1 to symbol index 12 can be used to transmit a physical channel (for example, a PDSCH) carrying downlink data, or it can be used for transmission of a physical channel (for example, PUSCH) carrying uphill link data. According to the interval structure of figure 2, DL transmission and UL transmission can be performed sequentially in one interval, and thus DL data transmission / reception and ACK / NACK UL reception / transmission for DL data can be performed in one interval. As a result, the time taken to retransmit data when a data transmission error occurs can be reduced, thereby minimizing the final data transmission latency.
[088] In an interval structure like this, a slack time is required for the process of switching from transmission mode to reception mode or from reception mode to gNB and UE transmission mode. In the name of the process of switching between the transmit mode and the receive mode, some OFDM symbols in the time of switching from DL to UL in the interval structure are established as a guard period (GP).
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29/113 [089] In the legacy LTE / LTE-A system, a DL control channel is multiplexed by time division with a data channel and a PDCCH, which is a control channel, is transmitted over an entire band of total system. However, in the new RAT, a system's bandwidth is expected to reach approximately a minimum of 100 MHz and it is difficult to distribute the control channel over the entire band for transmission of the control channel. For data transmission / reception from a UE, if the total bandwidth is monitored to receive the DL control channel, this can cause an increase in battery consumption of the UE and deterioration in efficiency. Therefore, in the present invention, the DL control channel can be transmitted locally or transmitted distributively in a partial frequency band in a system band, i.e., a channel band.
[090] In the NR system, a basic transmission unit is an interval. An interval duration can consist of 14 symbols with a normal cyclic prefix (CP) or 12 symbols with an extended CP. The interval is scaled in time as a function of a used subcarrier spacing. That is, if the subcarrier spacing increases, the length of the gap is shortened. For example, when the number of symbols per interval is 14, the number of intervals in a 10 ms frame is 10 in a 15 kHz subcarrier spacing, 20 in a 30 kHz subcarrier spacing, and 40 in a subcarrier spacing 60 kHz. If a subcarrier spacing increases, the length of OFDM symbols is shortened. The number of OFDM symbols in a range depends on whether the OFDM symbols have a normal CP or an extended CP and does not vary according to subcarrier spacing. A basic time unit used in the LTE system, T _s , is defined as T _s = 1 / (15,000 * 2,048) seconds when considering a basic subcarrier spacing of 15 kHz and a maximum TFT size of 2,048 for the LTE system and corresponds to a sampling time for a 15 kHz subcarrier spacing. In the NR system, several lengths of subcarrier besides
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30/113 of the 15 kHz subcarrier spacing can be used. Since the subcarrier spacing and a corresponding time length are inversely proportional, an actual sampling time corresponding to subcarrier spacing greater than 15 kHz is less than T _s = 1 / (15,000 * 2,048) seconds. For example, actual sampling times for 30 kHz, 60 kHz and 120 kHz subcarrier spacing will be 1 / (2 * 15,000 * 2,048) seconds, 1 / (4 * 15,000 * 2,048) seconds and 1 / (8 * 15,000 * 2,048) seconds, respectively.
[091] Analog Beam Formation [092] A fifth generation (5G) mobile communication system discussed recently is considering using an ultra-high frequency band, that is, a frequency band of millimeter equal to or greater than 6 GHz, to transmit data to a plurality of users over a wide frequency band while maintaining a high transmission rate. In 3GPP, this system is used as NR and, in the present invention, this system will be referred to as an NR system. Since the millimeter frequency band uses a very high frequency band, a frequency characteristic of the same band exhibits very strong signal attenuation depending on distance. Therefore, in order to correct an accentuated propagation attenuation feature, the NR system using a band at least above 6 GHz uses a narrow beam transmission scheme to solve a coverage decrease problem caused by accentuated propagation attenuation when transmitting signals in a specific direction in order to focus energy instead of in all directions. However, if a signal transmission service is provided using only a narrow beam, since a range served by a BS becomes narrow, BS provides a broadband service by collecting a plurality of narrow beams.
[093] In the millimeter frequency band, that is, millimeter wave band
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31/113 (mmW), the wavelength is shortened, and thus a plurality of antenna elements can be installed in the same area. For example, a total of 100 antenna elements can be installed on a 5 by 5 cm panel in a 30 GHz band with a wavelength of about 1 cm in a two-dimensional array at 0.5λ intervals (length of wave). Therefore, in mmW, increasing the coverage or throughput by increasing the beam formation gain (BF) using multiple antenna elements is taken into account.
[094] As a method of forming a narrow beam in the millimeter frequency band, a beam formation scheme is considered mainly in which the BS or the UE transmits the same signal using an appropriate phase difference by means of a large number antennas so that power only increases in a specific direction. A beamforming scheme like this includes digital beamforming to give a phase difference to a digital baseband signal, analog beamforming to give a phase difference to a modulated analog signal using time latency (i.e., offset cyclic), and hybrid beam formation using both digital beam formation and analog beam formation. If a transceiver unit (TXRU) is provided for each antenna element to enable adjustment of power and transmission phase, independent beam formation is possible for each frequency resource. However, installing TXRU in the total of about 100 antenna elements is less cost-effective. That is, the millimeter frequency band needs to use numerous antennas to correct the pronounced attenuation characteristic. Digital beam formation requires as many radio frequency (RF) components (for example, a digital to analog converter (DAC), a mixer, a power amplifier, a linear amplifier, etc.) as the number of antennas. Therefore, if digital beam formation is desired to be implemented in the millimeter frequency band, the cost of communication devices increases.
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Consequently, when a large number of antennas is required such as in the millimeter frequency band, use of analog beam formation or hybrid beam formation is considered. In the analog beamforming method, multiple antenna elements are mapped to a TXRU and a beam direction is adjusted using an analog phase switch. This analog beamforming method can use only one beam direction in the entire band, and thus may not perform frequency selective beamforming (BF), which is disadvantageous. The hybrid BF method is an intermediate type of digital BF and analog BF and uses B TXRUs less in number than Q antenna elements. In the case of hybrid BF, the number of directions in which beams can be transmitted at the same time is limited a B or less, which depends on the accumulation method of B TXRUs and Q antenna elements.
[095] As mentioned earlier, digital BF can simultaneously transmit or receive signals in multiple directions using multiple beams when processing a baseband digital signal to be transmitted or received, while analog BF cannot simultaneously transmit or receive signals in multiple directions exceeding a beam coverage range when executing BF in a state in which an analog signal to be transmitted or received is modulated. Typically, BS simultaneously performs communication with a plurality of users using broadband transmission or characteristics of multiple antennas. If BS uses analog or hybrid BF and forms an analog beam in one beam direction, eNB communicates only with users included in the same analog beam direction because of an analog BF feature. A method of allocating RACH resources and a method of using BS resources according to the present invention, which will be described later, are proposed considering restrictions caused by the characteristic of analog BF or hybrid BF.
[096] Formation of Analog Hybrid Beams
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33/113 [097] Figure 3 illustrates in an abstract form TXRUs and a hybrid BF structure in terms of physical antennas.
[098] When a plurality of antennas are used, a hybrid BF method in which digital BF and analog BF are combined is considered. Analog BF (or BF RF) refers to an operation in which an RF unit performs pre-coding (or combining). In hybrid BF, each of a baseband unit and the RF unit (also referred to as a transceiver) performs pre-coding (or combination) so that performance approaching digital BF can be achieved while the number of RF strings and the number of digital to analog (D / A) converters (or analog to digital (A / D)) are reduced. For convenience, the hybrid BF structure can be expressed as N TXRUs and M physical antennas. Digital BF for L layers of data to be transmitted by a transmitter can be expressed as a matrix of N by L. Next, N converted digital signals are converted to analog signals via the TXRUs and analog BF expressed as a matrix and M by N is applied to analog signals. In figure 3, the number of digital beams is L and the number of analog beams is N. In the NR system, BS is designed to change analog BF into symbol units and efficient BF support for a UE located in a region specific is considered. If the N TXRUs and M RF antennas are defined as an antenna panel, the NR system still considers a method of introducing multiple antenna panels to which independent hybrid BF is applicable. Thus, when BS uses a plurality of analog beams, since the analog beam is favorable for signal reception and may differ according to each UE, a beam scan operation is considered in such a way that, for at least one signal of synchronization, system information and pagination, all UEs can have reception opportunities by changing a plurality of analog beams, which the BS is to apply, according to symbols in a specific range or subframe.
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34/113 [099] Currently a 3GPP standardization organization is considering network slicing to reach a plurality of logical networks on a single physical network in a new RAT system, that is, the NR system, which is a communication system without 5G wire. Logical networks must be able to support several services (for example, eMBB, mMTC, IIRLLC, etc.) having several requirements. A physical layer system of the NR system considers a method supporting an orthogonal frequency division multiplexing (OFDM) scheme using variable numerologies according to various services. In other words, the NR system can consider the OFDM scheme (or multiple access scheme) using independent numerologies in respective regions of time and frequency resources.
[0100] Recently, as data traffic increases noticeably with the appearance of smart phone devices, the NR system needs to support greater communication capacity (for example, data transfer rate). One method considered to increase communication capacity is to transmit data using a plurality of transmit (or receive) antennas. If digital BF is desired to be applied to multiple antennas, each antenna requires an RF chain (for example, a chain consisting of RF elements such as a power amplifier and a down converter) and a D / A or A / D converter . This structure increases hardware complexity and consumes high energy, which may not be practical. Therefore, when multiple antennas are used, the NR system considers the hybrid BF method mentioned above in which digital BF and analog BF are combined.
[0101] Figure 4 illustrates a cell in a new radio access technology (NR) system.
[0102] Referring to figure 4, in the NR system, a method in which a plurality of transmission and reception points (TRPs) form a cell is
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35/113 being discussed, differently from a legacy LTE wireless communication system in which a BS forms a cell. If multiple TRPs form a cell, seamless communication can be provided even when a TRP that provides a service to a UE is changed, so mobility management of the UE is facilitated.
[0103] In an LTE / LTE-A system, a PSS / SSS is transmitted in an omnidirectional way. However, a method is considered in which a gNB using millimeter wave (mmWave) transmits a signal such as a PSS / SSS / PBCH via BF while sweeping beam directions omnidirectionally. Transmitting / receiving a signal while scanning beam directions is referred to as beam scanning or beam scanning. In the present invention, "beam scan" represents a transmitter's behavior and "beam scan" represents a receiver's behavior. For example, assuming that the gNB can have a maximum of N beam directions, the gNB transmits a signal such as a PSS / SSS / PBCH in each of the N beam directions. That is, the gNB transmits a synchronization signal such as the PSS / SSS / PBCH in each direction while sweeping directions that the gNB may have or that the gNB wishes to support. Alternatively, when gNB can form N beams, a group of beams can be configured by grouping a few beams and the PSS / SSS / PBCH can be transmitted / received in relation to each group of beams. In this case, a bundle of bundles includes one or more bundles. The signal such as the PSS / SSS / PBCH transmitted in the same direction can be defined as a synchronization block (SS) and a plurality of SS blocks can be present in a cell. When multiple SS blocks are present, SS block indexes can be used to distinguish between SS blocks. For example, if the PSS / SSS / PBCH is transmitted in 10 beam directions in a system, the PSS / SSS / PBCH transmitted in the same direction can constitute an SS block and it can be understood that 10 SS blocks are present in the
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36/113 system. In the present invention, a beam index can be interpreted as an SS block index.
[0104] Figure 5 illustrates transmission of an SS block and a RACH resource connected to the SS block.
[0105] To communicate with a UE, the gNB must acquire an optimal beam direction between the gNB and the UE and must continually track the ideal beam direction because the ideal beam direction is changed as the UE moves . A procedure of acquiring the ideal beam direction between the gNB and the UE is referred to as a beam acquisition procedure and a procedure of continuously tracking the ideal beam direction is referred to as a beam tracking procedure. The beam acquisition procedure is necessary for 1) initial access in which the UE first attempts to access the gNB, 2) transfer between cells in which the UE is transferred from one gNB to another gNB, or 3) beam recovery to recover from a state in which the UE and gNB cannot maintain an ideal communication state or enter an impossible communication state, that is, beam failure, as a result of losing an ideal beam while performing beam tracking to search for the beam ideal between UE and gNB.
[0106] In the case of the NR system being developed, a multi-stage beam acquisition procedure is under discussion, for beam acquisition in an environment using multiple beams. In the multi-stage beam acquisition procedure, gNB and UE perform connection setup using a wide beam in an initial access stage and, after connection setup is completed, gNB and UE perform optimal quality communication using a narrow band. In the present invention, although several methods for beam acquisition of the NR system are discussed mainly, the method most actively discussed today is as follows.
[0107] 1) The gNB transmits an SS block per wide beam in order to the UE
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37/113 researching gNB in an initial access procedure, that is, performing cell search or cell acquisition, and to look for a wide beam ideal for use in a first beam acquisition stage when measuring channel quality of each wide beam. 2) The UE performs cell search for an SS block per beam and performs DL beam acquisition using a cell detection result for each beam. 3) The UE performs a RACH procedure to inform the gNB that the UE will access the gNB that the UE has discovered. 4) The gNB connects or associates the beam transmitted SS block and a RACH resource to be used for RACH transmission, in order to induce the UE to inform the gNB of a result of the RACH procedure and simultaneously of a result of DL beam acquisition (e.g. beam index) at a wide beam level. If the UE performs the RACH procedure using a RACH resource connected to an ideal beam direction that the UE has discovered, the gNB obtains information about a DL beam suitable for the UE in a procedure of receiving a RACH preamble.
[0108] Beam Matching (BC) [0109] In a multi-beam environment, whether a UE and / or a TRP can accurately determine a transmit (Tx) or receive (Rx) beam direction between the UE and the TRP is problematic. In the multi-beam environment, repetition of signal transmission or beam scanning for signal reception can be considered according to a reciprocal Tx / Rx capacity of the TRP (for example, the eNB) or the UE. The reciprocal capacity Tx / Rx is also referred to as beam matching (BC) Tx / Rx in the TRP and UE. In the multi-beam environment, if the reciprocal Tx / Rx capacity in the TRP or UE is not maintained, the UE may not transmit a UL signal in a beam direction in which the UE has received a DL signal because an ideal UL path may be different from an ideal DL path. BC Tx / Rx in the TRP remains if the TRP can determine an Rx TRP beam for UL reception based on DL EU measurement for one or more Tx beams from the TRP and / or
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38/113 if the TRP can determine a Tx TRP beam for DL transmission based on UL measurement for one or more RP beams from the TRP. BC Tx / Rx in the UE remains if the UE can determine an UE Rx beam for UL transmission based on DL measurement of UE for one or more UE Rx beams and / or if the UE can determine an UE Tx beam for DL reception according to TRP indication based on UL measurement for one or more UE Tx beams.
[0110] In the LTE system and in the NR system, a RACH signal used for initial access to gNB, that is, initial access to gNB through a cell used by gNB, can be configured using the following elements.
[0111] * Cyclic prefix (CP): This element is used to prevent interference generated by a previous / front symbol (OFDM) and to group RACH preamble signals arriving at gNB with several time delays in a time zone. That is, if the CP is configured to match a maximum radius of a cell, RACH preambles that UEs in the cell have transmitted in the same resource are included in a RACH reception window corresponding to the length of RACH preambles configured by gNB for RACH reception. A CP length is generally set to be equal to or greater than a maximum round-trip delay.
[0112] * Preamble: A sequence used by gNB to detect signal transmission is defined and the preamble is used to load this sequence.
[0113] * Safety time (GT): This element is defined to induce a RACH signal reaching the gNB with a delay farther from the gNB in RACH coverage so as not to create interference in relation to a signal arriving after a RACH symbol duration. During this GT, the UE does not transmit a signal so that the GT cannot be defined as the RACH signal.
[0114] Figure 6 illustrates the configuration / format of a RACH preamble and a receiver function.
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39/113 [0115] The UE transmits a RACH signal by means of a RACH resource designated in a gNB system timing obtained by means of an SS. The gNB receives signals from multiple UEs. In general, the gNB performs the procedure illustrated in figure 5 for receiving the RACH signal. Once a CP for the RACH signal is established for a maximum round trip delay or more, gNB can set an arbitrary point between the maximum round trip delay and the CP length as a limit for signal reception. If the threshold is determined as a starting point for signal reception and if correlation is applied to a signal of a length corresponding to a sequence length from the starting point, gNB can acquire information as to whether the RACH signal is present and information about the PC.
[0116] If a communication environment operated by gNB such as a millimeter band uses multiple beams, the RACH signal arrives at the eNB in multiple directions and the gNB needs to detect the RACH preamble (ie, PRACH) while sweeping beam directions for receive the RACH signal arriving from multiple directions. As mentioned earlier, when analog BF is used, gNB performs RACH reception only in one direction at a time. For this reason, it is necessary to design the RACH preamble and a RACH procedure so that the gNB can properly detect the RACH preamble. The present invention proposes the preamble RACH and / or the RACH procedure for a high frequency band to which the NR system, especially BF, is applicable when considering the case in which BC from gNB remains and the case in which BC does not remain .
[0117] Figure 7 illustrates a receiving beam (Rx) formed in a gNB to receive a RACH preamble.
[0118] If BC does not hold, beam directions can be mismatched even when gNB forms an Rx beam in a Tx beam direction of an SS block in a state in which a RACH resource is connected to the SS block. Therefore, a
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40/113 RACH preamble can be configured in a format illustrated in figure 7 (a) so that gNB can perform beam scan to perform / attempt to perform RACH preamble detection in multiple directions while scanning Rx beams. However, if BC remains, once the RACH resource is connected to the SS block, gNB can form an Rx beam in a direction used to transmit the SS block in relation to a RACH resource and detect the RACH preamble only in that direction. Therefore, the RACH preamble can be configured in a format illustrated in figure 7 (b).
[0119] As previously described, a RACH signal and a RACH resource must be configured when considering two purposes of a DL beam acquisition report and a preferred DL beam report from the UE and gNB beam scanning according to BC.
[0120] Figure 8 illustrates a RACH signal and a RACH resource to explain terms used to describe the present invention. In the present invention, the RACH signal can be configured as follows.
[0121] * RACH resource element: The RACH resource element is a basic unit used when the UE transmits the RACH signal. Since elements of different RACH resources can be used for transmitting a RACH signal by different UEs, respectively, a CP is inserted into the RACH signal in each RACH resource element. Protection for signals between UEs is already maintained by the CP and, therefore, a GT is not needed between elements of RACH resources.
[0122] * RACH resource: The RACH resource is defined as a set of elements of concatenated RACH resources connected to an SS block. If RACH resources are allocated consecutively consecutively, two successive RACH resources can be used for signal transmission by different UEs, respectively, just like the elements of RACH resources. Therefore, the CP can be inserted in the RACH signal in each RACH resource. The GT is unnecessary among resources
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RACH because signal detection distortion caused by time delay is prevented by the CP. However, if only one RACH resource is configured, that is, RACH resources are not configured consecutively, since a PUSCH / PUCCH can be allocated after the RACH resource, the GT can be inserted in front of the PUSCH / PUCCH.
[0123] * RACH resource set: The RACH resource set is a set of concatenated RACH resources. If multiple SS blocks are present in a cell and RACH resources connected respectively to the multiple SS blocks are concatenated, the concatenated RACH resources can be defined as a set of RACH resources. The GT is inserted at the bottom of the RACH resource set which is a part where the RACH resource set including RACH resources and another signal such as a PUSCH / PUCCH can be found. As mentioned earlier, since the GT is a duration in which a signal is not transmitted, the GT may not be defined as a signal. The GT is not illustrated in figure 8.
[0124] * RACH preamble repetition: When a RACH preamble for gNB Rx beam scan is configured, that is, when gNB configures a RACH preamble format so that gNB can perform Rx beam scan, if the same signal (ie, same sequence) is repeated within the RACH preamble, the CP is not necessary between the repeated signals because the repeated signals serve as the CP. However, when preambles are repeated within the RACH preamble using different signals, CP is required between preambles. The GT is not needed between RACH preambles. Next, the present invention is described with the assumption that the same signal is repeated. For example, if the RACH preamble is configured in the form of 'CP + preamble + preamble', the present invention is described with the assumption that the preambles within the RACH preamble are configured in the same sequence.
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42/113 [0125] Figure 8 illustrates RACH resources for a plurality of SS blocks and RACH preambles in each RACH resource in terms of gNB. GNB tries to receive a RACH preamble on each RACH resource in a time region in which RACH resources are configured. The UE transmits a RACH preamble to it via RACH resource (s) linked to specific SS block (s) (e.g. SS block (s) having better Rx quality) instead of transmitting the preamble RACH on each of the RACH resources for all SS blocks in the cell. As mentioned earlier, elements of different RACH resources or different RACH resources can be used to transmit RACH preambles across different UEs.
[0126] Figure 9 illustrates a set of RACH resources. Figure 9 (a) illustrates the case where two elements of RACH resources per RACH resource are configured in a gNB cell in which BC remains. Figure 9 (b) illustrates the case where a RACH resource element per RACH resource is configured in the gNB cell in which BC remains. Referring to figure 9 (a), two RACH preambles can be transmitted in a RACH resource connected to an SS block. Referring to figure 9 (b), a RACH preamble can be transmitted on a RACH resource connected to an SS block.
[0127] A set of RACH resources can be configured as shown in figure 9 in order to maximize the efficiency of a RACH resource using the RACH signal configuration feature described in figure 8. As shown in figure 9, in order to increase use / allocation efficiency of the RACH resource, RACH resources or RACH resource elements can be configured to be completely concatenated without allocating an empty duration between RACH resources in the RACH resource pool.
[0128] However, if RACH resources are configured as shown in figure 9, the following problems may arise. 1) When BC remains and gNB receives a RACH resource corresponding to the SS #N block when forming a
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43/113 beam in the direction of the SS #N block, since an Rx beam is switched in a medium of OFDM symbols (OSs) defined for a data or control channel, the gNB only partially uses resources unless a frequency resource allocated as the RACH resource. That is, as illustrated in figure 9 (a), if the gNB forms an Rx beam to receive the SS # 1 block, OS # 4 cannot be used for the data channel or the control channel. 2) When BC does not hold and gNB performs Rx beam scanning within a RACH resource element, gNB can perform RACH preamble detection while receiving a data / control signal when forming an Rx beam in each of the OSs in an OS # 1 / OS # 2 / OS # 3 limit on a RACH resource corresponding to the SS # 1 block. However, when gNB performs a beam scan for a RACH resource corresponding to the SS # 2 block, a beam direction to receive the data / control signal and a beam direction to receive a RACH preamble are not matched in a duration corresponding to the OS # 4 so that a problem occurs when detecting the RACH preamble.
[0129] In summary, if the gNB performs beam scanning while changing the direction of an Rx beam to receive the RACH signal and a time when the Rx beam is changed diverges from a defined OFDM symbol limit for the data channel or For control purposes, there is a problem of decreasing the efficiency of resource use / allocation of the data or control channel served in a frequency region other than a frequency resource allocated as the RACH resource. To solve this problem, the present invention proposes to allocate a RACH resource as a structure aligned with an OFDM symbol limit, in order for the gNB to perform RACH preamble detection while changing a beam direction in a multi-beam scenario and simultaneously for the gNB use all radio resources except the RACH resource for the data and control channels. When BC remains, for example, a RACH resource or a RACH preamble transmitted via the RACH resource can be aligned with an OFDM symbol limit using two methods such as
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44/113 as illustrated in figure 10.
[0130] Figure 10 illustrates limit alignment of a RACH resource according to the present invention. An example illustrated in figure 10 corresponds to the case where BC remains and two elements of RACH resources can be transmitted in a RACH resource. When BC is not maintained, a RACH preamble can be configured by means of a CP and a plurality of consecutive preambles as illustrated in figure 7 (a) or figure 8 (a). Even in this case, the present invention is applicable. Only one RACH resource element can be transmitted in a RACH resource and the present invention is applicable to this.
[0131] 1) One of the methods (hereinafter Method 1) for aligning an OFDM symbol limit and a RACH resource limit determines a CP length and a preamble length of a RACH preamble when taking into account ability to detect RACH preamble by gNB, gNB coverage and a subcarrier spacing from the RACH preamble, and then configure a RACH resource element using the CP length and the preamble length, as shown in figure 10 (a). GNB can configure the RACH resource when determining the number of RACH resource elements per RACH resource when considering the capacity of the RACH resource. The gNB configures RACH resource (s) in such a way that a limit of each of the RACH resources that must be used consecutively is aligned with an OFDM symbol limit (s) that must be used for the channels of data and control. In this case, an empty duration can occur between RACH resources. The empty duration can be configured as a duration in which signals are not transmitted. Alternatively, a signal can be transmitted additionally as a post fixation only for the last element of the RACH resource in the RACH resource. That is, the UE that transmits a RACH preamble using the last RACH resource element in the time domain among RACH resource elements in a RACH resource can add a post-fix signal to the preamble
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RACH and then transmit the RACH preamble. The UE that transmits a RACH preamble using a RACH resource element other than the last RACH resource element can transmit the RACH preamble without adding the postfix signal.
[0132] 2) Another method (then Method 2) among the methods of aligning the OFDM symbol limit and the RACH resource limit sets a CP length and a preamble length in order to align the RACH resource limit with the OFDM symbol limit as shown in figure 10 (b). However, since the number of RACH resource elements in each RACH resource can vary, if the length of the RACH preamble is changed to match the OFDM symbol limit, there is a danger of changing characteristics of a preamble sequence in the RACH preamble. . That is, the length of a ZadoffChu (ZC) sequence used to generate a preamble is determined to be 839 or 130 according to a preamble format as shown in Table 4. If the preamble length is changed in order to align the length of the RACH preamble with the OFDM symbol limit, the characteristics of the ZC sequence which is the preamble sequence may vary. Therefore, if a RACH preamble format is determined and RACH resource elements per RACH resource are determined, the length of the RACH preamble can be fixed, but a CP length can become greater than a given length when configuring the RACH preamble format of way that the RACH resource is aligned with the OFDM symbol limit. That is, this method serves to align a RACH resource limit, that is, a RACH preamble limit transmitted via the RACH resource, with an OFDM symbol used to transmit the data / control channel (ie, normal OFDM symbol) by fixing the length of each preamble to the RACH preamble and increasing the CP length to match the OFDM symbol limit in order to maintain characteristics of the preamble sequence. In this case, only CP lengths
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46/113 of some RACH resource elements can be configured to be increased (that is, only CP lengths of some RACH preambles are configured to be increased) or CP lengths of all RACH resource elements can be configured to be increased so appropriate (ie, a CP length of each RACH preamble is configured to be appropriately increased). For example, if gNB configures the RACH resource in the time domain configured using OFDM symbols, gNB configures a preamble format indicating a CP length and a sequence part length such that the sequence part length is a multiple of a positive integer of a preamble length obtained from a specific length (for example, the length of a ZC sequence for a RACH) according to the number of preambles to be included in a corresponding RACH preamble and the CP length is equal to a value obtained by subtracting the length of the sequence part from the total length of the normal OFDM symbols. If the lengths of OFDM symbols are all the same, the RACH preamble format according to the present invention will be defined in such a way that the sum of a multiple of a positive integer of a predefined preamble length (for example, a length of preamble obtained from a predefined length of a sequence ZC) and a length CP is a multiple of an OFDM symbol length. When the UE detects an SS block from a cell and generates a RACH preamble to be transmitted in a RACH resource connected to the SS block, the UE generates the RACH preamble by generating each preamble to be included in the RACH preamble using a sequence of a specific length (for example, a ZC sequence) according to a preamble format configured by the gNB and add a CP to a front part of the preamble or repetition (s) of the preamble.
[0133] Method 1 and Method 2 can be applied equally even
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47/113 when gNB performs an Rx beam scan because BC does not hold. When BC holds to Method 1 and Method 2, there is a high possibility that a RACH preamble is configured in a format including a preamble. However, except that there is a high possibility that the RACH preamble is configured to include preamble repetition when BC does not hold, Method 1 and Method 2 described with reference to figure 10 can be applied equally to the case where gNB want to perform Rx beam scan because BS does not retain. For example, when BC is not maintained in such a way that the gNB wants to perform beam scanning Rx, the gNB sets up and signals a preamble format (for example, refer to figure 7 (a) or figure 8 (a)) in the form of including preamble repetition. Here, the RACH resource can be configured in the form of Method 1 in order to monitor RACH preamble (s) when considering a duration from the end of a RACH resource to a part immediately before the start of the next RACH resource as an empty duration or post-fixation duration. Alternatively, the RACH resource can be configured in the form of Method 2 in order to monitor RACH preamble (s) on each RACH resource configured by gNB with the assumption that the RACH preamble limit is equal to the OFDM symbol limit.
[0134] The RACH resource allocation method proposed in the present invention serves to efficiently use a frequency resource, other than a frequency resource occupied by the RACH resource, in one interval or in multiple intervals used for the RACH resource, as a data resource or a control channel resource. Therefore, for efficient use of the data / control channel feature considering the RACH feature, gNB needs to scale the data or control channel using information such as which unit is used to form a beam in relation to an interval for which the RACH resource is allocated. The UE can receive information such as which OFDM symbol unit is used when the gNB performs scaling and can transmit the data or control channel based on
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48/113 in the information. For this purpose, two methods can be considered so that gNB can scale the data or control channel over a time region to which the RACH resource is allocated.
[0135] * Allocation of Mini-Interval.
[0136] When a channel is staggered in a time region to which the RACH resource is allocated, since the staggered channel must be included in a beam region, a time length of a resource for which the channel is allocated must be less than a RACH resource time length and a plurality of small length intervals can be included for a RACH resource.
[0137] If gNB operates by setting a beam direction for each RACH resource and units of time in which gNB allocates a resource to the UE are not matched in a time region to which the RACH resource is allocated and in a time region for which the RACH resource is not allocated, gNB must define an interval for scheduling in a time region occupied by the RACH resource and notify the UE of information related to the interval. Then, the interval used for scheduling in the time region occupied by the RACH resource will be referred to as a mini-interval. In this structure, there are some considerations in order to transmit the data or control channel through the mini-interval. For example, the following considerations are given.
[0138] 1) The case where a mini-interval is defined for an interval for which the RACH resource is allocated:
[0139] Figure 11 illustrates a method of configuring a mini-interval within a RACH INTERVALOrach interval when BC remains.
[0140] The UE is aware of all information regarding RACH resources that gNB uses through system information. Therefore, a set of minimal OFDM symbols including an entire RACH resource allocated per SS block can be
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49/113 defined as a mini-break. When the gNB performs scheduling at a time for which the RACH resource is allocated, the UE interprets the mini-interval as a TTI and transmits the data or control channel in the TTI. If multiple mini-intervals are included in a normal interval, the UE needs to determine by which mini-interval the UE should transmit the data / control channel. A method for the UE to determine a mini-interval to be used to transmit the data / control channel in general can include the following two schemes.
[0141] A. If the gNB stagger transmission from a UL control / data channel, the gNB may designate, for the UE, which mini-interval within a range the UE should use for transmission, through DCI.
[0142] B. The UE continuously performs beam tracking in a multi-beam scenario. If the UE has previously received information from the gNB about an SS block to which a beam that is serving which the UE currently receives a service is connected to, the UE interprets the same time region as a time region to which the RACH resource connected to the SS block associated with the beam it is serving is allocated as a time region in which the UE must perform transmission. If the RACH resource connected to the SS block associated with the beam serving the UE is not present in a staggered interval for the UE, the UE can determine that beam divergence has occurred.
[0143] 2) The case where multiple mini-intervals are defined in an interval for which the RACH resource is allocated:
[0144] Figure 12 illustrates another method of configuring a mini-interval within a RACH INTERVALOrach interval when BC remains.
[0145] When multiple mini-intervals are defined in an interval to which a RACH resource is allocated, this is basically similar to the case in which multiple mini-intervals are defined in an interval to which a RACH resource is allocated except that multiple mini-intervals are present in an interval for which a
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50/113 RACH resource is allocated. The same operation as the method proposed in figure 11 is performed. However, as illustrated in figure 12, a set of minimal OFDM symbols including an entire RACH resource is divided into a few subsets and each subset is defined as a mini-gap. In this case, the gNB must first inform the UE of how the minimum OFDM symbol set including a RACH resource should be divided to use the mini-ranges. For example, gNB can indicate to the UE, in a bitmap form, how the minimum OFDM symbols including the RACH feature are divided. Alternatively, when the minimum OFDM symbols including the RACH resource can be divided into a plurality of equal subsets, the gNB can inform the UE about the number of allocated mini-intervals. Furthermore, the gNB must indicate, for the staggered UE, by which mini-interval among the multiple mini-intervals the UE should transmit the data / control channel. The gNB can directly indicate through the DCI a mini interval through which the data / control channel must be transmitted. Alternatively, when the UE is staggered over a time region for which the RACH resource is allocated, gNB can inform the UE of a mini-interval to be used, in advance (for example, during connection setup). Alternatively, it is possible to determine a mini-interval to be used by means of a predetermined rule using information, such as a UE ID, which is shared between the UE and the gNB.
[0146] 3) The case in which BC does not hold, and thus beam scanning is performed during preamble repetition:
[0147] Figure 13 illustrates a method of configuring a mini-interval within a RACH INTERVALOrach interval when BC is not maintained.
[0148] When BC is not maintained, gNB performs beam scanning while scanning beam directions from a receiver at an interval to which a RACH resource is allocated, as previously described. So this case can
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51/113 operate in a similar way to a scheme in which BC remains and multiple mini-intervals are present in an interval to which the RACH resource is allocated. For this purpose, similarly to the method described in figure 12, gNB transmits information to the UE as to how the beam scan will be performed against a set of minimal OFDM symbols including the RACH feature and information such as which SS block each beam is connected to. This information can be used as information as to which mini-interval can be scaled to the UE. In this case, similar to the method described in figure 12, the UE can receive, through DCI, the information about which mini-interval among the multiple mini-intervals that can be scaled to the UE is scaled to transmit the data / control channel. Alternatively, the information can be pre-scaled using an RRC signal or it can be defined using a predefined rule using information shared between the gNB and the UE.
[0149] 4) The case of free concession scheduling:
[0150] A. When a data / control channel time resource transmitted by the UE in a concession free resource overlaps a RACH resource, the data / control channel can be transmitted in a defined mini-interval in a region of time of the RACH resource. However, when concession free scaling is used and a data / control channel signal format that the UE is to transmit through concession free scaling, that is, through a concession free resource, is a normal interval or an interval that is less than the normal interval, but is greater than the mini interval defined in a RACH resource region and when the length of the mini interval is too small, so that a transmission code rate of the data / control via the mini interval is too high in relation to a designated code rate, the UE can i) drop the transmission, ii) change a transport block size, or iii) transmit the data / control channel using multiple mini-intervals when multiple mini
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52/113 ranges are available. On the other hand, when the transmission code rate of the data / control channel is less than the designated code rate, even if the data / control channel is transmitted with the length of the mini-gap, the UE can transmit the channel data / control with a designated transport block size.
[0151] B. When concession-free scaling is used and the signal format of the data / control channel that the UE is to transmit through concession-free scaling, that is, through the concession-free resource, is less than the mini-interval, the data / control channel can be transmitted normally at a mini-interval location determined in the scheme mentioned above. That is, if the data / control channel through concession-free scaling requires a resource of a length shorter than that of the mini-interval in the time domain, the UE transmits the data / control channel through a mini interval corresponding to the same Rx gNB beam as the data / control channel among mini-intervals configured to match the length of the RACH resource (that is, of the RACH preamble). In this case, the transport block size may increase according to a predetermined rule in proportion to a mini-gap length compared to a pre-configured signal format. For example, if the signal format in which the data / control channel is transmitted via concession-free scaling is defined as using two OFDM symbols and the mini-interval length in a RACH interval corresponds to three OFDM symbols, the transport block size capable of loading the data channel / concession free escalation control can be multiplied by 1.5.
[0152] 5) Allocation of mini-interval for safety time or empty duration:
[0153] Figure 14 illustrates a method of setting up a mini interval using
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53/113 a safety time.
[0154] gNB can freely configure an Rx beam with respect to a part of a duration configured as the safety time, or an empty duration in a remaining interval after configuring a RACH resource in an interval, even if the empty duration is not for use of security time. Therefore, the gNB can notify the UE of information about a mini-gap capable of being used independently of a beam for receiving the RACH resource together with information related to the RACH resource and the UE can expect that dynamic scaling will be performed in relation to to the mini-interval configured in the safety time. The location (s) of allocated mini-range (s) can be determined using the methods described above (for example, methods of indicating the length and locations of configured mini-ranges in a RACH interval and a beam direction).
[0155] 6) Small PUCCH resource allocation:
[0156] In a TDD system, a control channel can be transmitted in a partial duration of an interval by configuring the control channel with a short length. In an NR system, schemes in which a DL control channel is transmitted at the front of an interval and an UL control channel is transmitted at the last part of an interval are under discussion. In particular, the UL control channel transmitted in this way is referred to as a small PUCCH. Since the small PUCCH is configured to be transmitted in the last or the last two symbols, the small PUCCH can be transmitted in the mini-interval described above. However, as mentioned earlier, since a beam direction can vary within a range, the small PUCCH cannot always be located in the last part of the range. Therefore, when the small PUCCH is staggered in an interval region to which a RACH resource is allocated, the UE transmits the small PUCCH in a mini-interval in which a beam in the
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54/113 same direction of a beam from which the UE receives a service (that is, an Rx gNB beam, or a Tx UE beam corresponding to the Rx gNB beam) or a beam in which the gNB previously forms a link to the small PUCCH (i.e., an Rx gNB beam, or a Tx UE beam corresponding to the Rx gNB beam) is present. In this case, the PUCCH can be transmitted at the last symbol location in the mini-interval, at a symbol location designated by gNB via signaling or at a symbol location determined by a rule. However, the UE may drop the transmission of the small PUCCH when the beam in the same direction as a beam from which the UE receives a service or the beam in which the gNB previously forms a link to the small PUCCH is not present.
[0157] * Concatenation of Mini-Interval.
[0158] In the procedure of forming the Rx beam for the RACH resource pool, if the Rx beam directions of the respective RACH resources are not very different, the data or control channel can be transmitted through a long interval to perform transmission over a lifetime of the RACH resource pool. This can be referred to as mini-gap concatenation in which the mini-ranges described above are used by means of concatenation as previously described.
[0159] Figure 15 illustrates an example of transmitting data when performing concatenation of mini-intervals with the same length as a normal interval when BC remains. In particular, figure 15 illustrates transmission of concatenated mini-intervals and insertion of a reference signal in a RACH resource duration when BC remains. For example, a data packet can be transmitted over a long interval obtained by concatenating mini-intervals so that the long interval can be the same length as a normal interval. In this case, a data packet is transmitted divided into mini-intervals within the long interval.
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55/113 [0160] Thus, in the case of data transmission using the concatenated mini-intervals, since gNB forms an Rx beam of each RACH resource using information about an SS block transmission direction, the UE desirably transmits a signal in a direction capable of receiving each SS block with the best quality. Therefore, gNB notifies the UE about information related to Rx beam formation (for example, information associated with the SS block) in relation to each OFDM symbol (when BC is not maintained) or in relation to each RACH resource (when BC remains) in a RACH resource time region. In this case, uniform reception of the data channel may not be performed because the RX beam of the gNB is changed during signal transmission while the UE performs signal transmission through concatenated mini-intervals and transmits a reference signal in a format set to a normal range. Therefore, it is necessary to insert the reference signal in a unit in which the gNB Rx beam direction varies when considering variation in the gNB Rx beam direction. For this purpose, a reference signal structure for the concatenated mini-intervals allocated in a RACH resource duration can be desirably defined. The UE to which the data or control channel of a concatenated mini-interval format is allocated in the duration of the RACH resource must transmit the reference signal of the concatenated mini-interval format.
[0161] During transmission of a PUSCH or PUCCH, if a stable Rx gNB beam for a PUSCH or PUCCH EU Tx beam direction is not present or if a plurality of beams are of similar quality, the PUSCH or a long PUCCH it can be received steadily when transmitting PUSCH or PUCCH via concatenated mini-intervals in order to use a beam diversity feature. In this case, gNB can efficiently use a time resource to which a RACH resource is allocated when transmitting PUSCH or PUCCH in a region of RACH resources.
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56/113 [0162] Additionally, gNB performs beam tracking for a Tx beam or for an Rx beam in such a way that a beam having the best quality is maintained as a beam that is serving in order to steadily maintain a service in a multi-beam environment. Therefore, gNB can measure quality of the Rx gNB beam or the Tx UE beam and perform beam tracking by inducing the UE to perform repetitive transmission of the PUSCH, long PUCCH or small PUCCH in each RACH resource region or transmit an RS defined for beam tracking through a plurality of mini-intervals, using a feature in which gNB changes the Rx beam by an interval duration for which the RACH resource is allocated. That is, for efficient use of a beam tracking feature, gNB can induce the UE to transmit a physical channel suitable for a characteristic to a time region to which the RACH resource is allocated and gNB can use the physical channel. as a feature for beam tracking. In other words, for efficient use of the beam tracking feature, the gNB can indicate to the UE that the UE should transmit the physical channel through a Tx UE beam suitable for each of the mini-intervals configured in the region of time for which the RACH resource is allocated and gNB can use the physical channel in each mini-gap for beam tracking. In order for the UE to efficiently transmit a signal for beam tracking, the gNB notifies the UE of information about a change in a beam direction as described above and the UE inserts a reference signal in each RN beam of the gNB according to this information and a predefined rule and transmits the reference signal. The gNB can use the reference signal as a signal for channel estimation for an Rx beam duration or as a signal for measuring signal quality for beam tracking.
[0163] When transmitting the PUSCH or the long PUCCH that is received in the gNB through beam diversity, since the gNB tries to receive a signal in each Rx beam duration, antenna gain may have a different characteristic. Therefore,
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57/113 the UE can differently configure PUSCH / PUCCH transmit power in relation to each Rx beam direction (for example, each RACH resource region). For this purpose, the gNB can inform the UE that reference channel / signal information and a power control parameter, for calculating path loss used for open loop power control, must be configured separately for each RACH resource region. The UE configures and transmits different transmission powers in a RACH resource time region using this information.
[0164] Unlike this, when transmitting a signal for beam tracking (or beam management) in a plurality of RACH resource regions, the respective RACH resource regions must maintain the same transmission power in order for a gNB to measure quality of a signal received by gNB. In this case, only one reference / signal channel is necessary to control a power. If the gNB notifies the UE of information about the reference / signal channel or if the information is predefined by a rule, the UE can determine the magnitude of transmission power using the reference / signal channel and transmit the PUSCH / PUCCH to the apply transmission power equally to all regions.
[0165] The gNB can inform the UE as to whether UL data or the control channel transmitted in a RACH resource transmission time region, that is, a time region for which the RACH resource is configured in a cell corresponding, is used for beam diversity or for beam tracking in relation to each UL channel and to induce the UE to perform a power control operation according to the use indicated above.
[0166] PRACH configuration.
[0167] PRACH configuration includes time / frequency information for a RACH resource and can be included in the remaining minimum system information
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58/113 (ISMS). The ISMS can be interpreted as a system information block 1 (SIB1) and represents system information that the UE must acquire after receiving a master system information block (MIB) through a physical broadcast channel (PBCH). Upon receiving the PRACH configuration information, the UE is able to transmit the PRACH 1 message (Msg1) in a designated time and frequency resource using a preamble in a set of preambles included in the PRACH configuration. A preamble format in the PRACH configuration information can also provide CP length, number of repetitions, subcarrier spacing, sequence length, etc.
[0168] Next, the PRACH configuration will be described in detail.
[0169] 1. Configuration of RACH resources in the time domain.
[0170] Configuration of RACH resources in the time domain will be described with reference to figures 16 and 17. Here, RACH resources refer to time / frequency resources through which the PRACH 1 message can be transmitted. Configuration of RACH preamble index in RACH resources is described. RACH resources are associated with SS blocks to identify a preferred downlink link Tx beam direction. That is, each RACH resource in the time domain is associated with an SS block index.
[0171] Furthermore, a set of time domain RACH resources can be defined in relation to the standard SS block periodicity in a cell. A plurality of RACH resources associated with a single SS block can be within the time domain RACH resource set. Referring to figure 16, an SS block period and a RACH resource pool period can be established as shown in figure 16. The RACH resource pool period can be determined based on the SS block period and a plurality RACH resource pool can be configured in the RACH resource pool period. The RACH resource pool period can be established according to
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59/113 PRACH configuration information, as previously described. In this case, the RACH resource pool period can be identical to a PRACH configuration period. In the present disclosure, the PRACH configuration period, that is, the RACH configuration period can refer to a period of time in which a set of RACH resources appears according to the corresponding RACH configuration.
[0172] In figure 16, an instance of time for which a RACH resource is allocated is called a RACH occasion. That is, a RACH resource can be called a RACH occasion when only the time domain and the frequency domain are considered without a sequence domain. If the RACH resource pool period is determined based on the SS block period, a correct timing instance can be indicated as an offset from the moment of transmission of an SS block associated with the corresponding RACH resource. Correct positions of RACH occasions in a set of RACH resources are also provided for UEs.
[0173] Figure 17 illustrates a method of indicating association between SS blocks and RACH resources. Each set of RACH resources is established using an SS block period. Since the correct starting points for RACH resource sets corresponding to SS blocks in the time domain can be different, a synchronism offset between each SS block and a corresponding RACH resource set can be signaled.
[0174] A RACH resource duration is determined using a PRACH preamble format. The length (for example, preamble format) of a RACH preamble including a safety time is established according to cell coverage. Furthermore, the number of repetitions in a preamble determines the duration of the RACH resource. Therefore, configuration of RACH resources includes the number of repetitions of a RACH sequence to indicate a length of
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60/113 preamble in addition to the RACH preamble format for a CP length.
[0175] As previously described, a procedure for acquiring an initial downlink link beam in an NR system using multiple beams is preferably performed by detecting an SS block having the highest reception quality. Therefore, information about a downlink link preferred by a UE is signaled to a gNB through an initial RACH procedure. Therefore, information about a beam index corresponding to an SS block detected by a UE can be signaled indirectly through the resource positions for transmitting the RACH preamble in the NR system. For example, a RACH resource is linked to each SS block and a UE signals, for a gNB, information about a beam index in the form of a RACH resource connected to each SS block, as described previously with reference to the figure That is, the UE can signal a preferred downlink beam, i.e., SS block, to the gNB when transmitting a PRACH using the RACH resource associated with the SS block detected by the UE.
[0176] As previously described, time / frequency resources of RACH resources are linked to SS blocks basically, and so it is desirable to allocate RACH resources based on a standard SS block transmission period used in an initial access stage. However, when the number of UEs located in a gNB cell is small, RACH resources can be allocated intermittently when compared to a standard transmission period. Therefore, the present disclosure proposes defining an interval for which RACH resources are allocated as a RACH interval and allocating a RACH interval period for a multiple of a standard SS block transmission period. Although the previous description is based on a multi-beam environment, it can be efficient to allocate RACH resources in the same way in a single beam environment in order to maintain the same structure. Furthermore, the RACH interval period can be
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61/113 associated with a RACH configuration period established by the aforementioned PRACH configuration information, and a period between RACH intervals located in the same position within a RACH configuration period or having the same index can be identical to the RACH configuration period. Information regarding RACH time resources among RACH resource allocation information transmitted from a / gNB network to UEs may include the following.
[0177] 1) An associated SS block index;
[0178] 2) The position of a RACH interval from an SS block;
[0179] 3) A RACH interval period represented by a multiple of an SS block period or a function of the SS block period;
[0180] 4) A displacement value to indicate a correct position without ambiguity when a RACH interval period in relation to an SS block period is greater than 1. Here, the displacement value is established based on subframe number 0 .
[0181] When time / frequency resources to which RACH resources are allocated are linked to SS blocks, the number of RACH resources on which a UE can perform RACH transmission can be identical to the number of SS blocks. Although RACH resources include time, frequency and code domain resources capable of carrying a RACH preamble in general, RACH resources are used as blocks of time / frequency resources capable of carrying a RACH preamble in the present disclosure for the convenience of description. However, RACH resources mentioned together with a preamble sequence can be used as a concept including a sequence domain, that is, a code domain. For example, when RACH resources are represented as sharing the same time / frequency resource, RACH resources can correspond to a plurality of RACH resources when the sequence domain is also considered, however they are a RACH resource from the point of view.
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62/113 of resources has ρο / frequency.
[0182] However, it may be inefficient to allocate different RACH resources to SS blocks in an environment where the number of UEs located in a gNB is small. Therefore, if the gNB is capable of receiving RACH preambles via the same Rx beam or simultaneously receiving RACH preambles via a plurality of beams, the same time / frequency resource can be allocated to RACH resources connected to a plurality of SS blocks . That is, a plurality of SS blocks can be associated with a single RACH time-frequency resource. In this case, SS blocks in relation to a RACH resource can be broken down by means of preamble indices or sets of preamble indices used in the RACH resource. That is, the number of RACH resources can be allocated to be equal to or less than the number of SS blocks.
[0183] The gNB determines a time / frequency domain for which RACH resources will be allocated and signals information to a UE through system information. In the case of LTE, one or two subframes constitute a RACH interval according to a preamble format and thus a UE can be made aware of the position of a RACH resource in the time domain if the gNB designates a specific subframe position by means of information PRACH configuration On the other hand, the NR system requires different types of information according to the gNB configuration and environment. In particular, a RACH preamble is established in such a way that a short basic sequence is robustly defined against a high Doppler frequency, Rx beam scan, design complying with TDD / FDD and others and repeated for beam scan and ensure coverage. Therefore, the position of a RACH time resource can be very variable depending on a gNB or environment. Furthermore, the NR system can be composed of a plurality of very small cells. In this case, the RACH preamble can become considerably small and thus an interval
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RACH in which a plurality of RACH preambles can be transmitted can be configured in the time domain. For example, RACH time resource information can be provided for UEs as illustrated in figure 18.
[0184] Figure 18 illustrates RACH time resource information. Information regarding RACH resource time resources, that is, PRACH time resource information, may include the following information.
[0185] 1) A relative position of a RACH resource / interval in relation to an SS block position or a position of a RACH interval in relation to an SS period;
[0186] 2) The position of an OFDM symbol where a RACH resource starts at a RACH interval;
[0187] 3) A preamble format (that is, CP length and sequence length) in relation to a RACH resource and the repetition number of a sequence; and / or [0188] 4) Information on how many RACH resources defined as above will be allocated for a time axis. Information corresponding to the position of each of a plurality of RACH resources; for example, a relative position or an absolute position for each RACH resource when RACH resources are allocated and are not consecutive on the time axis.
[0189] However, even if RACH resources connected to a plurality of SS blocks share the same time / frequency resources, a UE needs to discriminate and transmit RACH preambles in relation to its respective RACH resources connected to SS blocks for the same time resources / frequency in order to transfer beam acquisition information to gNB. For this purpose, sequences of preambles available in a single RACH resource need to be divided into SS blocks and allocated for this. Sequences of preambles in LTE and NR systems are composed of a root sequence that determines a basic sequence and
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64/113 combination of sequences cyclically displaced having zero correlation in each root sequence and an orthogonal coverage sequence. Here, to improve resource efficiency, a plurality of root sequences can be allocated to ensure a large number of preamble sequences within a RACH resource. In general, a cross correlation between root sequences is greater than a cross correlation between sequences having different cyclic displacement versions or sequences having different orthogonal coverage sequences. In addition, a signal received via a beam other than a suitable beam for a UE is weak because of the beam characteristics, and so cross-correlation between corresponding sequences does not significantly affect RACH reception performance even if the cross-correlation is slightly large in a beam direction other than a beam direction for the UE. Therefore, when a plurality of RACH resources share the same time / frequency resource, it is desirable that each RACH resource is composed of sequences of preambles having a small cross-correlation. If sequences of RACH preambles are composed of a root sequence and a combination of sequences having different cyclic displacement versions or orthogonal cover sequences in the root sequence as in the embodiment described above, preamble sequences having different cyclic displacement versions in the same root sequence or sequences of preambles having different orthogonal coverage sequences in the same root sequence can preferably be allocated to the same bundle, that is, RACH resources linked to a single SS block, and then different root sequence indexes can be allocated. For example, preamble strings can be allocated to RACH time / frequency resources as illustrated in figure 19.
[0190] Figure 19 illustrates an example of RACH preamble sequence allocation.
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65/113 [0191] Referring to figure 19, the root strings {15, 27, 127, 138} are allocated to a single time / frequency resource and an orthogonal coverage {0, 1} and a cyclic shift version {0,1,2, 3} are allocated to each root sequence. Here, when two RACH resources are allocated to the time / frequency resource, an OCC index and a ZC index composed of a cyclic shift version are allocated preferentially to a RACH resource connected to the umpteenth SS block, and a set of sequences of RACH preambles composed of two root sequences {15, 27} are allocated. A set of sequences of RACH preambles is allocated to a RACH resource linked to an order SS block (N + 1) in the same order. To signal RACH resources to a UE, a gNB signals information to configure a set of RACH preamble strings per RACH resource and determines the order of RACH preamble strings in the set of RACH preamble strings according to a predefined rule. Here, the predefined rule preferably increases a RACH preamble sequence index to {OCC index, cyclic shift version} and then increases the next RACH preamble sequence index based on a root sequence index. That is, the RACH preamble sequence index preferably increases in increasing order of cross correlations between sequences.
[0192] 2. Configuration of RACH resources in the frequency domain.
[0193] PRACH configuration can provide information about a frequency domain of a RACH resource. When a UE attempts PRACH transmission in a situation in which the UE has not yet been connected to a cell, the UE cannot recognize the system bandwidth or resource block indexing.
[0194] In LTE, a UE can easily acquire the correct position of a RACH resource because a synchronization signal is transmitted at the center of the system bandwidth and a PBCH provides the system bandwidth. However, NR
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66/113 does not guarantee transmission of the synchronization in the center of the system bandwidth. Therefore, a UE cannot easily acquire resource block indexing for PRACH transmission in NR. Therefore, a method of providing a RACH resource position in the frequency domain is required.
[0195] Since UEs in an idle mode acquire frequency synchronization based on an SS block, it is desirable that information regarding a frequency position of a RACH resource is provided in relation to an SS block bandwidth. That is, a RACH resource in the frequency domain needs to be positioned within an SS block bandwidth in which a UE detects an SS block. A RACH preamble transmission bandwidth has a value set at a standard 15 kHz subcarrier spacing of a PSS / SSS / PBCH. For example, the RACH preamble transmission bandwidth can be fixed at 1.08 MHz at the standard 15 kHz subcarrier spacing. In addition, when the RACH preamble transmission bandwidth is 1.08 MHz, an SS block transmission bandwidth on the assumption that a subcarrier spacing is 15 kHz is four times the bandwidth of RACH transmission. A network needs to provide a correct RACH resource position in the frequency domain within an SS block.
[0196] If the network sets up a RACH resource outside an SS block on which a PSS / SSS / PBCH is transmitted, information about the RACH resource needs to be signaled based on the bandwidth of the SS block and the bandwidth of the RACH. Here, the system bandwidth is indexed in units of the SS block bandwidth.
[0197] 3. The number of resources in the time domain.
[0198] A short ZC sequence is used as a PRACH NR preamble. The short ZC sequence can cause a lack of sequences in a time resource defined as a provisional CP and RACH preamble. To solve this problem, a
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67/113 plurality of time and frequency resources can be allocated to RACH resources in a RACH interval and a gNB needs to signal the amount of time resources used in the RACH interval in addition to frequency resource information for UEs.
[0199] 4. Sequence information.
[0200] In LTE, 64 strings are allocated to a RACH resource and, when a root code (ie, root sequence) is allocated, the cyclic shift version of the root code is mapped to a preamble index first before other codes roots are used because of the zero-pass correlation feature.
[0201] The same feature can be reused in an NR-PRACH. Sequences having zero-pass correlation can preferably be allocated to a RACH preamble. Here, pass-through correlation is provided according to a cyclic shift version and a defined orthogonal coverage (when defined). When a root code is allocated, an orthogonal coverage is allocated according to a rule or predefined settings and a cyclic offset version having the root code and the orthogonal coverage is mapped to a preamble index.
[0202] In summary, PRACH configuration signaled by gNB for UEs can include the following parameters.
[0203] - Allocation of RACH resources in the time / frequency domain: a preamble format (a CP duration and the repetition number of a ZC sequence);
[0204] - Sequence information: a root code index, an orthogonal coverage index (if defined) and a cyclic offset length.
[0205] 5. RACH interval pattern.
[0206] A plurality of interval patterns within a specific time interval in which RACH resources can be included is determined with
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68/113 Msg 1 RACH subcarrier spacing base.
[0207] (1) RACH 1 interval pattern configuration method.
[0208] When an SS block transmission period is 5 ms, all first intervals within the 5 ms period are reserved for SS block transmission. If the SS block transmission period is 10 ms, the first interval of the first half frame with the 10 ms period is reserved for SS block transmission.
[0209] Although NR defines interval positions for transmission of SS blocks, that is, candidate interval positions for SS blocks in which transmission of SS blocks is possible, SS blocks are not transmitted at candidate interval positions all the time. That is, candidate interval positions are not reserved for transmission of SS blocks all the time.
[0210] However, a RACH interval standard for RACH resources depends considerably on the candidate interval positions for transmission of SS blocks. However, it is not efficient to define a RACH interval pattern depending only on the candidate interval positions for SS block transmission in terms of resource flexibility, and so the RACH interval pattern needs to be defined when considering intervals at which SS blocks are actually transmitted. . Therefore, the present disclosure defines a rule for allocating RACH interval for RACH resources as follows.
[0211] - An interval in which SS blocks can be transmitted can be reserved for RACH resources according to SS blocks actually transmitted. Here, information about the transmitted SS blocks is actually signaled via ISMS.
[0212] - Even if a RACH interval is reserved as RACH resources according to the PRACH configuration, the RACH interval may not be used as RACH resources according to an SS block transmission period.
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69/113 [0213] - Even though RACH intervals are reserved as RACH resources according to the PRACH configuration, a RACH interval flagged as an interval in which SS blocks are actually transmitted via RMSI may not be used as RACH resources.
[0214] Since the transmitted SS block positions are actually determined according to network selection, corresponding information is signaled to UEs via ISMS, but it is difficult to define a single RACH interval pattern linked to RACH resources according to SS block patterns actually transmitted and different SS block transmission periods. Therefore, a rule for defining a RACH interval pattern can be defined in such a way that information about a transmitted SS block actually takes precedence over configuring RACH resources.
[0215] A RACH interval configuration duration for RACH resources can be 10/20 ms and is determined when considering network load and operation. In addition, to support RACH interval pattern configuration for RACH resources that have a longer period such as 80 ms or 160 ms, the network needs to provide a RACH interval pattern period based on a basic interval pattern such as a 20 ms interval pattern.
[0216] Specifically, an interval pattern that can include RACH resources can be configured independently of candidate interval positions in which SS blocks can be transmitted or configured in a candidate interval position in which SS blocks can be transmitted.
[0217] Figure 20 illustrates candidate interval positions where SS blocks can be transmitted within a 10 ms window in bands of 6 GHz or less. Subcarrier spacing usable for transmission of SS blocks at 6 GHz or less is 15 kHz and 30 kHz and the number of slot positions where SS blocks can be transmitted is a maximum of 8.
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70/113 [0218] If a long string having a 1.25 kHz or 5 kHz subcarrier spacing is used for 6 GHz RACH preamble transmission, the RACH interval pattern setting that can be reserved as RACH resources can be established based on an interval having a length of 1 ms. Table 8 shows examples of RACH interval pattern settings established based on the interval having a length of 1 ms, as previously described.
[0219] However, accurate information regarding the RACH preamble format used in Table 8 can be flagged separately.
Table 8
interval pattern setting index Preamble format Number of system frames Subframe (or range) number 0 0, 1.3 Pair 0 1 0, 1.3 Pair 1 2 0, 1.3 Pair 2 3 0, 1.3 Pair 3 4 0, 1.3 Pair 4 5 0, 1.3 Pair 5 6 0, 1.3 Pair 6 7 0, 1.3 Pair 7 8 0, 1.3 Pair 8 9 0, 1.3 Pair 9 10 0, 1.3 Any 1 11 0, 1.3 Any 2 12 0, 1.3 Any 3 13 0, 1.3 Any 4 14 0, 1.3 Any 5 15 0, 1.3 Any 6 16 0, 1.3 Any 7 17 0, 1.3 Any 8 18 0, 1.3 Any 9 19 0, 1.3 Pair 1.5 20 0, 1.3 Pair 1, 6 21 0, 1.3 Pair 2, 7 22 0, 1.3 Pair 3, 8 23 0, 1.3 Pair 4, 9 24 0, 1.3 Any 1, 6 25 0, 1.3 Any 2, 7
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26 0, 1.3 Any 3, 8 27 0, 1.3 Any 4, 9 28 0, 1.3 Pair 0, 3, 7 29 0, 1.3 Pair 1.4, 8 30 0, 1.3 Pair 2, 4, 7 31 0, 1.3 Pair 3, 6, 8 32 0, 1.3 Pair 4, 7, 9 33 0, 1.3 Any 1, 3, 6 34 0, 1.3 Any 2, 4, 7 35 0, 1.3 Any 3, 7, 9 36 0, 1.3 Any 4, 7, 9 37 0, 1.3 Pair 2, 4, 7, 9 38 0, 1.3 Any 2, 4, 7, 9 39 2 Pair 0, 1, 2, 3 40 2 Pair 5, 6, 7, 8 41 2 Pair 0, 1,2, 3, 5, 6, 7, 8 42 2 Any 3, 4, 5, 6 43 2 Any 4, 5, 6, 7 44 2 Any 5, 6, 7, 8
[0220] A RACH interval pattern in the case of a short string needs to be determined based on Msg 1 subcarrier spacing when considering alignment with a PUSCH interval limit having a subcarrier spacing of a RACH preamble such as 15/30 / 60/120 kHz. Determining a RACH gap pattern based on Msg 1 subcarrier spacing means that RACH gap pattern information is determined using a gap length determined by Msg 1 subcarrier spacing as a base unit and signaled for UEs. Msg 1's subcarrier spacing is 15/30 kHz at 60 GHz or less and 60/120 kHz at 6 GHz or more.
[0221] The SS block subcarrier spacing may differ from the Msg 1 subcarrier spacing. For example, in bandwidths of 6 GHz or less, the SS block subcarrier spacing can be 15 kHz and the subcarrier spacing of the Msg 1 is 30 kHz or the SS block subcarrier spacing can be 30 kHz and Msg 1 subcarrier spacing is 15 kHz. Similarly, the SS block subcarrier spacing can be 120 kHz and the Msg 1 subcarrier spacing is 60 kHz or the
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72/113 SS block carrier spacing can be 240 kHz and Msg 1's sub carrier spacing is 120 kHz.
[0222] However, the RACH interval pattern relates to the uphill link interval configuration information and therefore needs to have at least Msg 1 numerology resolution. Therefore, the RACH interval pattern for RACH resources needs to be determined based on in Msg 1 subcarrier spacing when considering an interval / time duration over which SS blocks can be transmitted regardless of SS block subcarrier spacing. Furthermore, as previously described, the RACH resource allocation principle considering SS block allocation can be defined in such a way that information about transmitted SS blocks actually takes precedence over the configuration of RACH resources as previously discussed in relation to the RACH preamble based on long sequence.
[0223] In addition, in the case of a RACH preamble format having a 15 kHz subcarrier spacing, a RACH interval duration is determined based on the 15 kHz subcarrier spacing. That is, in this case, the RACH interval duration is 1 ms and so a RACH preamble having a 15 kHz subcarrier spacing can have a RACH interval pattern arranged in at least one symbol (preferably, two or more symbols) in an interval of 1 ms. In addition, since the RACH interval duration based on the 15 kHz subcarrier spacing is 1 ms, the RACH interval pattern based on the 15 kHz subcarrier spacing can be used as a RACH interval pattern for a long sequence, which is defined in relation to the 1 ms interval.
[0224] That is, an interval pattern for the RACH preamble format having a 15 kHz subcarrier spacing can use the same pattern as the RACH preamble format having a long string, as shown in
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Table 8.
[0225] Furthermore, in the case of a RACH preamble format having a subcarrier spacing of 30 kHz, a RACH interval duration is determined based on the subcarrier spacing of 30 kHz. That is, the RACH interval duration is 0.5 ms and 20 intervals are included per radio frame. Similarly, in the case of a RACH preamble format having a subcarrier spacing of 60 kHz, a RACH interval pattern includes an interval of 0.25 ms, that is, 40 intervals per radio frame. In the case of a RACH preamble format having a 120 kHz subcarrier spacing, a RACH interval pattern is determined based on 80 intervals per radio frame. Therefore, the RACH interval pattern can be specified according to a subcarrier spacing of a RACH preamble. In other words, M states need to be specified according to the subcarrier spacing of the RACH preamble, and states according to the subcarrier spacing have RACH interval frequencies (the numbers of RACH intervals over a specific period of time) and / or different periodicities.
[0226] Alternatively, a basic interval pattern such as a RACH interval pattern for 15 kHz subcarrier spacing can be used for greater subcarrier spacing when repeated in the time domain.
[0227] This method reuses the RACH interval pattern described earlier based on an interval having a length of 1 ms and reduces the interval length according to the subcarrier spacing through a scaling method to set up a pattern. For example, when the subcarrier spacing is 30 kHz, the interval length is reduced to 0.5 ms and 20 intervals are included in a radio frame. That is, in the case of the RACH gap pattern configuration index 0 in Table 8, the 0 interval index is reserved for a RACH resource in frames having even numbers. This
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74/113 is, it is assumed that a standard RACH interval base includes 10 intervals in a 10 ms radio frame. When this is scaled to an interval having a 30 kHz subcarrier spacing, two groups of 10 intervals are present in a 10 ms radio frame. That is, two interval patterns having 10 intervals as a base RACH interval pattern are present in the corresponding time duration (10 ms). Here, a range actually allocated to RACH resources can be signaled in units of a standard RACH range base. For example, an interval allocated to RACH resources can be specified by flagging a bitmap by number of even-numbered system frames as follows.
[0228] - “11”: Patterns of 10 intervals in two groups repeated in a 10 ms radio frame are effective as a RACH interval pattern for RACH resources.
[0229] - “10”: Only the first pattern of the 10 interval patterns in two groups repeated on the 10 ms radio frame is effective as a RACH interval pattern for RACH resources.
[0230] - “01”: Only the second pattern of 10 interval patterns in two groups repeated on the 10 ms radio frame is effective as a RACH interval pattern for RACH resources.
[0231] Similarly, when the standard RACH interval base mentioned earlier is scaled to an interval having a 60 kHz subcarrier spacing, four groups of 10 intervals are present in a 10 ms radio frame. Four RACH interval patterns having 10 intervals as a RACH interval pattern window are present in the corresponding time duration (10 ms). In the case of an interval having a 120 kHz subcarrier spacing, 8 RACH interval patterns are present.
[0232] That is, the RACH interval pattern setting is defined primarily based on the 15 kHz subcarrier spacing, an
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75/113 plurality of gap patterns can be repeated within a base time (for example, 10 ms) as the subcarrier spacing that determines the gap length of the RACH gap pattern increases, and any of N groups of repeated intervals that is actually used for RACH resources can be signaled in the form of a bitmap or the like.
[0233] (2) RACH 2 interval pattern configuration method.
[0234] Since a RACH preamble for a long sequence has a length of at least 1 ms, a RACH interval pattern needs to be configured in relation to an interval having a length of 1 ms. Figure 20 shows interval positions at which SS blocks can be transmitted within a 10 ms window at 6 GHz or less. Referring to figure 20, however, candidate interval positions in which SS blocks can be transmitted are defined, but candidate intervals are not always reserved for SS blocks. Furthermore, a RACH gap pattern for RACH resources depends to a considerable extent on an interval position for transmission of SS blocks. Therefore, it is practically difficult to define the RACH interval pattern when considering intervals at which SS blocks are transmitted. Therefore, the present disclosure proposes slot allocation for RACH resources when considering a maximum number of SS blocks that can be transmitted according to bandwidth.
Table 9
5 ms SSB frequency 10 ms SSB frequency SSB with 15 kHz SCS, L = 4 2, 3, 4, 7, 8, 9 2, 3, 4, 5, 6, 7, 8, 9 SSB with 15 kHz SCS, L = 8 4, 9 4, 5, 6, 7, 8, 9 SSB with 30 kHz SCS, L = 4 1, 2, 3, 4, 5, 6, 7, 8, 9 1,2, 3, 4, 5, 6, 7, 8, 9 SSB with 30 kHz SCS, L = 8 2, 3, 4, 7, 8, 9 2, 3, 4, 5, 6, 7, 8, 9
[0235] Table 9 shows indexes of RACH intervals for RACH resources in a radio frame at 6 GHz or less. A method of supporting a number
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76/113 maximum RACH resources corresponding to a maximum number of SS blocks is described with reference to Table 9. CDM / FDM is used mainly at 6 GHz or less, and so RACH resources can be discussed when considering a transmission period of 5 ms SS block and a RACH resource pattern can be configured over a 10/20 ms duration.
[0236] However, to support allocation of RACH resources within an 80/160 ms window, an offset value in relation to a RACH resource start position can be determined based on a basic time duration such as 10 ms or 20 ms.
[0237] In the case of a short string, a RACH gap pattern needs to be determined based on Msg 1 subcarrier spacing when considering alignment with a PlISCH range boundary having a subcarrier spacing of a RACH preamble such as 15 / 30/60/120 kHz. In the case of Msg 1 subcarrier spacing, a 15/30 kHz subcarrier spacing is used at 6 GHz or less and a 60/120 kHz subcarrier spacing is used at 6 GHz or more.
[0238] An SS block subcarrier spacing may differ from the Msg 1 subcarrier spacing. For example, an SS block subcarrier spacing can be 15 kHz and the Msg 1 subcarrier spacing can be 30 kHz or the Sub carrier spacing of SS blocks can be 30 kHz and Msg 1 sub carrier spacing can be 15 kHz in bandwidths of 6 GHz or less. Similarly, SS blocks having a 120 kHz subcarrier spacing and Msg 1 having a 60 kHz subcarrier spacing can be transmitted or SS blocks having a 240 kHz subcarrier spacing and Msg 1 having a 120 kHz subcarrier spacing. can be transmitted in bandwidths of 6 GHz or more. However, the RACH interval pattern relates to the interval configuration information
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77/113 uphill link and thus needs to be configured based on Msg 1 numerology resolution. Therefore, the RACH interval pattern for RACH resources needs to be determined based on Msg 1 subcarrier spacing when considering an interval duration / time in which SS blocks can be transmitted regardless of SS block subcarrier spacing. Here, determining the RACH gap pattern based on Msg 1 subcarrier spacing means that RACH gap pattern information is determined using a gap length determined by Msg 1 subcarrier spacing as a base unit and signaled for UEs.
[0239] Furthermore, in the case of a RACH preamble format having a 15 kHz subcarrier spacing, the length of a RACH interval is determined based on the 15 kHz subcarrier spacing. In this case, the length of the RACH interval is 1 ms and so the RACH preamble having a 15 kHz subcarrier spacing can have a RACH interval pattern arranged in at least one symbol (preferably, two or more symbols) within an interval 1 ms. In addition, since the length of the RACH interval based on the 15 kHz subcarrier spacing is 1 ms, the RACH interval pattern based on the 15 kHz subcarrier spacing can be used as a RACH interval pattern for a sequence long for which a RACH interval pattern is defined in relation to an interval having a length of 1 ms.
[0240] Furthermore, in the case of a RACH preamble format having a subcarrier spacing of 30 kHz, a RACH gap length is determined based on the subcarrier spacing of 30 kHz. That is, the RACH interval length is 0.5 ms and includes 20 intervals per radio frame. Figure 21 shows interval positions at which SS blocks can be transmitted in bandwidths of 6 GHz or less. The position of a range for resources
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RACH in a radio frame can be determined, as shown in Table
10, based on SS block subcarrier spacing and Msg 1 subcarrier spacing.
Table 10
Msg 1 with 15 kHz SCS, 10 ms SSB frequency Msg 1 with 30 kHz SCS, 10 ms SSB frequency SSB with 15 kHz SCS, L = 8 4, 5, 6, 7, 8, 9 8 ~ 19 SSB with 30 kHz SCS, L = 8 4 ~ 19 2 ~ 9
[0241] The RACH interval pattern is based on an interval having a length of 0.25 ms and including 40 intervals per radio frame when a 60 kHz subcarrier spacing is used and based on an interval having a length of 0.125 ms and inclusion of 80 intervals per radio frame when a 120 kHz subcarrier spacing is used. Therefore, the RACH interval pattern varies according to the subcarrier spacing of the RACH preamble. Figure 22 shows slot positions at which SS blocks can be transmitted based on SS block subcarrier spacing and Msg 1 subcarrier spacing. The position of an interval for RACH resources can be determined, as shown in Table 11, based on SS block subcarrier spacing and Msg 1 subcarrier spacing.
Table 11
Msg 1 with 60 kHz SCS, 10 ms SSB frequency Msg 1 with 120 kHz SCS, 10 ms SSB frequency SSB with 120 kHz SCS, L = 64 4, 9, 14, 19-39 8, 9, 18, 19, 28, 29, 38-79 SSB with 240 kHz SCS, L = 128 4, 9-39 8, 9, 18-79
[0242] In summary, M states per subcarrier spacing for the RACH preamble need to be specified and the respective states according to subcarrier spacing can have RACH interval frequencies and / or periods
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79/113 different.
[0243] 6. Priority between ATSS (Synchronized Signal Really Transmitted) and RACH resource [0244] Next, methods for solving problems in a case where an SS block is actually transmitted (then an transmitted SS block is actually referred to as “ATSS”) in a specific range included in a RACH range pattern for configuring RACH resources or in a case where an ATSS is generated for a duration corresponding to a specific RACH range pattern within a PRACH configuration window, or a PRACH setup period are proposed.
[0245] Collision between RACH resources and an ATSS can occur in both the RACH 1 and 2 interval pattern configuration methods described earlier. A difference between the two methods is that collision with an ATSS occurs in units of an interval in Method 1 whereas collision occurs according to the SS block transmission period in Method 2.
[0246] To solve this problem more efficiently, the RACH interval pattern settings table mentioned above can be configured using specific intervals, eg 10 or 20 intervals, as a basic unit, distinguished from Table 8 to configure a RACH interval pattern in which a RACH interval configuration index varies according to the number of system frames corresponding to the third column is an even number.
[0247] Here, a basis for configuring the RACH gap pattern may vary according to the RACH preamble format, Msg 1 subcarrier spacing and the length of a gap constituting a RACH gap pattern. For example, the basis for configuring the RACH interval pattern can be 10 intervals for a 1 ms interval and 20 intervals for a 0.25 ms interval. Then, it is assumed that a unit length that determines
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80/113 a RACH interval standard base is referred to as a RACH interval standard base and the RACH interval standard base is designated by the number of intervals instead of an absolute unit of time, i.e., ms.
[0248] When the standard RACH interval base for configuring RACH resources is configured similarly to Table 8, Table 12 is obtained.
Table 12
interval pattern setting index Subframe number (or range) interval pattern setting index Subframe number (or range) interval pattern setting index Subframe (or range) number 0 0 13 3, 8 26 3, 4, 5, 6, 1 1 14 4, 9 27 4, 5, 6, 7 2 2 15 1, 3, 7 28 5, 6, 7, 8 3 3 16 0, 4, 8 29 6, 7, 8, 9 4 4 17 2, 4, 7 30 0, 1,2, 3, 4, 5, 6,7 5 5 18 3, 6, 8 31 2, 3, 4, 5, 6, 7, 8,9 6 6 19 4, 7, 9 7 7 20 0, 2, 4, 6 8 8 21 1, 3, 5, 7 9 9 22 2, 4, 6, 8 10 0, 5 23 3, 5, 7, 9 11 1.6 24 0, 1,2, 3, 12 2, 7 25 2, 3, 4, 5
[0249] A difference between Table 8 and Table 12 is that the RACH interval pattern settings table is configured in units of a standard RACH interval base length. That is, one or more bases of RACH interval patterns can be repeated in a real RACH resource configuration window. The RACH resource configuration window designates a length of time in which RACH resources are configured and configuration of RACH resources is repeated per window. For example, if the RACH resource configuration window consists of 40 intervals while the standard RACH interval base is 10 intervals, a standard 10 interval RACH interval base is repeated four times during 40 intervals. Here, all four bases
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81/113 patterns of repeated RACH intervals can be allocated to RACH resources or only some of them can be allocated to RACH resources. That is, the number of a standard RACH range base allocated to RACH resources among the four standard RACH range bases # 0, # 1, # 2 and # 3 can be flagged. For example, [0250] - When all standard RACH range bases are allocated: 1111 [0251] - When only some of the standard RACH range bases are allocated to RACH resources: the number of a standard RACH range base actually allocated to RACH resources are signaled directly (for example, when the standard bases of RACH intervals # 1 and # 3 are allocated to RACH resources: 0101).
[0252] When it is determined whether a specific RACH interval standard base is allocated to RACH resources and the specific RACH interval standard base is signaled, the SS block transmission period also needs to be considered. For example, when the RACH interval length is 1 ms and the SS block transmission period is 20 ms in the mode described above, RACH resources may not be configured in a duration corresponding to frames in which SS blocks are transmitted. More specifically, the standard bases of RACH intervals # 0, # 1, # 2 and # 3 can be mapped to the zero, first, second and third frames, each having a length of 10 ms. When SS blocks are transmitted in frames # 0 and # 2, the standard bases of RACH intervals # 0 and # 2 are excluded from the configuration of RACH resources and a RACH interval pattern for RACH resources is applied to frames # 1 and # 3. However, when the SS block transmission period is 40 ms, the zero number frame is excluded from the RACH resource configuration and the first, second and third frames can be configured as RACH resources. Additional signage
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82/113 is required for frames that are not configured as RACH resources.
[0253] When the PRACH configuration window has a length of an integer multiple of a standard RACH interval base, which is greater than 1, if the number of an effective RACH interval standard base for RACH resources among standard interval bases Repeated RACH is flagged, a UE recognizes that RACH resources are configured only for a duration for which the standard RACH interval base is applied and does not recognize other durations as RACH resources.
[0254] In other words, when a portion of a standard RACH interval base duration effective for using RACH resources overlaps with an ATSS, [0255] 1) The total RACH interval standard base duration is not used as RACH resources . Even in this case, however, when an effective standard RACH interval base that does not overlap with an ATSS in the PRACH configuration window is additionally present, this standard RACH interval base can be used.
[0256] 2) A half frame or frame in which an ATSS is included in units of half a frame in the standard base duration of the corresponding RACH interval is not used as RACH resources and a half frame or frame in which an ATSS is not included and is used as RACH resources. In particular, when a plurality of standard RACH interval bases is present within the PRACH configuration window and the SS block transmission period is greater than the standard RACH interval base length, this method can be applied.
[0257] 3) An interval in which an ATSS is included in the standard base duration of the corresponding RACH interval is not used as RACH resources and an interval in which an ATSS is not included can be used as RACH resources. Particularly, when only a standard RACH range base is present
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83/113 in the PRACH configuration window and the SS block transmission period is equal to the standard base length of the RACH interval, this method should be used.
[0258] 4) That one of the methods 1), 2) and 3) above will be employed to use RACH resources while avoiding collision with an ATSS needs to be flagged or pointed further, and the three methods can be combined / selected according to conditions / environments.
[0259] The method of signaling a RACH interval pattern for configuring RACH resources based on Msg 1 subcarrier spacing in the case of a short string and signaling the RACH interval pattern based on the length (1 ms) of an interval configured based on a 15 kHz subcarrier spacing in the case of a long sequence has been proposed. Furthermore, in the case of Msg 1 based on a short sequence, the RACH interval pattern is configured using Msg 1 for interval limit alignment for PlISCH transmission. This can be interpreted as meaning that transmission of a PLISCH such as Msg 3 needs to match Msg 1's subcarrier spacing. Msg 1's subcarrier spacing can become different from Msg 3's subcarrier spacing for several reasons. . In addition, the network can establish standard numerology or reference numerology such as subcarrier spacing or gap length for operations such as a speed reduction mode. In this case, a RACH interval standard for configuring RACH resources needs to be determined based on standard numerology or reference numerology. Standard numerology or reference numerology can be signaled by the network to UEs as configuration or PRACH system information. Furthermore, standard numerology or reference numerology can be designated directly as a specific value or can be connected to a numerology of a RACH range that determines an interval pattern for configuring RACH resources by
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84/113 Msg 1 subcarrier spacing.
[0260] 7. Association between RACH resource and SS block index.
[0261] Next, a method of signaling a Tx beam direction of a gNB and connection information regarding RACH resources for UEs in an initial access state will be described in detail. The beam direction Tx of the gNB refers to a beam direction of SS blocks as previously described. In addition, when a UE can perceive / measure a specific RS other than SS blocks in the initial access state, the beam direction Tx can refer to the RS. For example, the specific RS can be a CSI-RS.
[0262] In NR, a plurality of SS blocks can be formed and transmitted according to the number of beams in a gNB. Furthermore, each SS block can have a unique index and a UE can infer the index of an SS block including a PSS / SSS / PBCH when detecting the PSS / SSS and decoding the PBCH. System information transmitted by gNB includes RACH configuration information. The RACH configuration information can include a list regarding a plurality of RACH resources, information to identify the plurality of RACH resources and connection information about each RACH resource and SS block.
[0263] Similar to the previous description in which RACH resources are limited to time / frequency resources in which a UE can transmit a PRACH preamble, RACH resources are limited to time / frequency resources in the description below. A method for indicating a RACH position on the frequency axis as well as a RACH position on the time axis will be described below. In the previous description, a RACH resource is linked to one or more SS blocks and consecutive RACH resources on the time axis are defined as a set of RACH resources. A plurality of consecutive sets of RACH resources on the frequency axis as well as on the time axis is defined as a block of RACH resources.
[0264] Figure 23 illustrates a RACH resource block.
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85/113 [0265] As illustrated in figure 23, the RACH resource block can be defined as a time / frequency grouping of RACH resources and each RACH resource in the RACH resource block has a unique index determined by the time / frequency.
[0266] The RACH resource index in the RACH resource block is mapped according to a specific rule. For example, the RACH resource index can be designated according to frequency-time ordering or time-frequency ordering. For example, referring to figure 21, RACH resources in the RACH resource blocks can be indexed as follows in the case of frequency-time ordering.
[0267] - RACH resource # 0 (time, frequency): (0, 0) [0268] - RACH resource # 1: (1, 0);
[0269] - RACH resource # 2: (2, 0);
[0270] Here, the time axis length unit in the RACH resource block can be determined using a RACH preamble format and the frequency axis length unit can be determined using a resource bandwidth. RACH (for example, 1.08 MHz) or a resource block group (RBG) unit.
[0271] When a UE requests transmission of system information when transmitting a specific RACH preamble, a plurality of RACH resource blocks can be designated in order to transmit information regarding the number of SS blocks or system information in a system / cell . Particularly, when there is a large number of SS blocks, if all the RACH resources corresponding to the respective SS blocks are configured to be consecutive, as described above, considerable restrictions can be imposed on uplink / downlink data services. Therefore, the network can configure consecutive RACH resources on the time / frequency axis as resource blocks
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RACH and fix the discontinued configured RACH resource blocks. Therefore, a plurality of RACH resource blocks can be configured and each RACH resource block can also have a unique index.
[0272] In other words, a duration in which RACH resource blocks are configured (referred to as a RACH configuration duration next) can be assigned in a system / cell, and one or more RACH blocks can be present in the configuration duration RACH. Figure 22 illustrates a RACH configuration duration in accordance with the present disclosure. Information that needs to be signaled by the network / gNB for UEs can include the length of the RACH configuration duration, the number of RACH resource blocks (ie, RACH blocks), the position of each RACH block and more. As shown in figure 24, UEs can be notified of RACH block intervals in the RACH configuration duration (i.e., RACH configuration period). For example, the / gNB network can signal the number of intervals or relative positions such as offset information in an absolute time unit of the RACH block # 0 as RACH block position information or directly signal the start interval index of a RACH block in the RACH configuration duration per RACH block.
[0273] Each RACH resource in a RACH resource block can have a unique configuration. In this case, RACH resources can have different frequencies and generation periods, and each RACH resource can be connected to a specific SSI-RS of the specific SS block or beam link-down direction. When there is a connection relationship like this, information about the connection is also provided for UEs. Figure 22 illustrates a RACH resource configuration in a RACH resource block. range indices that can be reserved for RACH resources in a specific RACH resource period can be defined in the standard document, and different configuration numbers can be allocated according to the frequency of generating RACH resources as illustrated in figure 25. The network / gNB can
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87/113 signaling a generation frequency / period for a specific RACH resource for UEs by signaling a specific configuration number via system information.
[0274] The network can signal the number of RACH resource blocks (ie RACH blocks) and a starting point (eg range index) for each RACH resource for UEs. In addition, the network signals the number of RACH resources, Nt, on the time axis and the number of RACH resources, Nf, on the frequency axis by signaling information about each block of RACH resources for UEs. Nt and Nf can be different for RACH resource blocks. The / gNB network maps RACH resource indices according to RACH resource time / frequency positions in a RACH resource block and signals information indicating a generation period / frequency per RACH resource (for example, configuration number) and information such as as a connected SS block or a CSI-RS index for UEs. Here, the / gNB network can signal the generation period / frequency per RACH resource by specifying a specific configuration number established according to the frequency of generation of RACH resource, as previously described.
[0275] Furthermore, the RACH preamble format can be established by means of a RACH resource. Although all formats of RACH preambles can be configured to be identical in the system, the same subcarrier spacing and number of repetitions are maintained in one RACH resource block and different RACH preamble formats can be established for respective RACH resource blocks. However, the number of repetitions of a RACH preamble is fixed in the same RACH resource block, but the respective RACH resources included in the RACH resource block can be configured to use different preamble strings. For example, different root indexes or different cyclic displacement (CS) versions can be established for the respective RACH resources included in the RACH resource block.
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88/113 [0276] RACH configuration signaling is summarized as follows. The network performs a process of identifying time / frequency resources, that is, RACH resources for transmission of RACH preamble. For this purpose, a RACH resource index can be determined using a RACH resource block index and a RACH resource index in a RACH resource block, and a RACH resource generation frequency / period per resource index RACH can correspond to each of a plurality of numbers of RACH configurations in the present disclosure. In addition, the network transmits RACH preamble information that can be used by RACH resource to a UE and transmits connected SS block index or CSI-RS indexing information. Therefore, the UE can acquire information regarding time / frequency resources and RACH preamble resources to be used when the UE intends to perform RACH in a specific downlink beam direction and perform RACH using the corresponding resources.
[0277] However, when a RACH interval pattern for configuring RACH resources is determined, as described previously, a RACH interval pattern that can include RACH resources can be configured regardless of intervals at which SS blocks can be transmitted or can be transmitted. configured for intervals at which SS blocks can be transmitted.
[0278] (1) Multiplexing of RACH resources (TDM / FDM / CDM).
[0279] Up to 8 SS blocks can be transmitted in bands of 6 GHz or less. For cases in which a maximum of 8 SS blocks are transmitted, 8 intervals in which RACH resources can be reserved may necessarily be required in a RACH interval pattern window or the 8 intervals may not necessarily be reserved. This is because restrictions that a gNB needs to transmit / receive signals in only one direction at a time are eliminated since it reserves 8 intervals having a length of 1 ms for
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89/113 RACH feature, which corresponds to the number of SS blocks, causes considerable system overload and digital beam formation can be applied apart from mmWave because of bands of 6 GHz or less.
[0280] Therefore, RACH resources in bands of 6 GHz or less can be multiplexed by code division or multiplexed by frequency division in a configured range. That is, as the number of transmitted SS blocks increases, the number of frequency axis resources need to be increased or RACH preamble resources need to be divided and used by SS blocks.
[0281] Up to 64 or 128 SS blocks can be transmitted in bands of 6 GHz or more. For 128 SS block transmission, 128 RACH resources may not be configured according to TDM all the time. When a large subcarrier spacing is used, a gap length on the time axis is reduced, but setting up 128 RACH resources according to TDM all the time acts on the network as an overhead, distinguished from cases in which a small subcarrier spacing is used. it is used. Therefore, although beamforming is performed in one direction only for transmission of SS blocks, CDM / FDM of RACH resources needs to be considered in addition to TDM of RACH resources as in the previously mentioned 6 GHz system or less when RACH preambles can be received simultaneously in a plurality of directions or signals can be transmitted simultaneously in a plurality of directions according to gNB capacity.
[0282] For this purpose, the number of resources multiplexed by frequency division needs to be signaled in an indicated RACH interval pattern configuration. Frequency axis information for RACH preamble transmission, that is, start frequency information, the number of frequency bands allocated to RACH resources, and whether frequency allocation is performed in a direction in which a frequency increases from one start frequency or in
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90/113 a direction in which a frequency decreases from the start frequency when RACH resources are multiplexed by frequency division, needs to be signaled or pointed out as a specific direction between a UE and a gNB. When multiple resources are multiplexed by frequency division on the frequency axis, resources or bands multiplexed by frequency division can be indexed at a specific time or at a specific interval, and frequency resource indexing information mapped by SS block needs to be flagged or pointed in a specific way between the UE and the gNB.
[0283] In addition, in the case of CDM using a RACH preamble, information regarding the number of RACH preambles allocated per SS block needs to be flagged. Furthermore, the number of RACH preambles allocated per SS block needs to be flagged when considering cases in which CDM / FDM are executed.
[0284] (2) ATSS block in RMSI (SIB 1/2).
[0285] Although up to 8 or 128 SS blocks can be transmitted, 8 or 128 or less SS blocks can be transmitted in a real system. If gNB does not additionally signal information about the number of SS blocks transmitted, gNB needs to signal information through RMSI (Minimum Remaining System Information) because UEs know the information exactly. This information is referred to as actually transmitted SS blocks (ATSSs).
[0286] It is desirable to allocate RACH resources based on actually transmitted SS blocks instead of allocating them based on an assumed maximum number of SS blocks comprised in the standard in order to prevent system waste. As shown in Table 9, when a RACH interval pattern for allocating RACH resources is configured, SS blocks may be transmitted or may not be transmitted at an interval indicated in the RACH interval pattern configuration. Such information can be detected using an ATSS included in the ISMS. Although a RACH interval pattern for
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91/113 RACH resources are configured except intervals in which SS blocks can be transmitted even in the RACH 2 interval pattern configuration method, mapping to real RACH resources is based on ATSSs. When RACH interval pattern configuration collides with part of ATSS information, that is, when the RMSI indicating ATSS transmission of SS blocks in an interval indicated by a RACH interval pattern, a UE recognizes that SS blocks are transmitted in the interval and thus the range cannot be used. That is, the UE does not attempt to transmit RACH preamble in the interval and the interval is excluded from the mapping for association between SS blocks and RACH resources.
[0287] The UE checks the number and positions of available RACH intervals by combining PRACH configuration and ATSS information. The number of intervals available on the time axis, the number of RACH resources in a RACH interval according to a RACH preamble format, the number of resources on the frequency axis and / or the number of available RACH preambles per SS block are combined to determine association between SS blocks and RACH resources. That is, the association between SS blocks and RACH resources is not previously established according to a RACH interval standard for allocation of RACH resources and a maximum number of SS blocks, but is determined according to the signaling provided and mapping between SS blocks and resources RACH is performed.
[0288] If RACH resources are multiplexed by time division and then RACH resources are multiplexed by frequency division, the positions of frequency axis resources, the number of frequency axis resources, information about the number of frequency resources for which an SS block is allocated and information about the number of RACH preambles allocated by frequency resource needs to be signaled. If RACH resources are multiplexed by time division and then RACH resources are multiplexed by code division, information about the number of RACH preambles that can be
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92/113 to be used per SS block needs to be flagged.
[0289] In other words, when Ns is the number of SS blocks, the following information needs to be signaled.
[0290] - Nf: The number of RACH resources that are multiplexed by frequency division at a time.
[0291] - Nfc: The number of RACH preambles that can be used in a frequency resource.
[0292] - Nfs: The number of frequency resources that can be associated with an SS block.
[0293] - Nc: The number of RACH preambles allocated per SS block.
[0294] A UE detects the number and positions of intervals that can be used as RACH resources available on the time axis by combining RACH interval pattern configuration and ATSS information and calculates the number of RACH resources on the time axis using a format of signaled RACH preamble.
[0295] The UE then calculates time / frequency / code information that can be used as RACH resources by combining frequency information and signaled code, performs indexing for corresponding RACH resources and then performs mapping between SS blocks and indexes corresponding RACH resources. However, a method by which the UE calculates a RACH resource index needs to be performed using a method previously pointed out between the UE and the network, and transmitted SS blocks are actually mapped / associated with RACH resource indexes in ascending order of indexes of SS blocks.
[0296] That is, when SS block indices signaled by RMSI indicating ATSSs are 2, 5, 5 and 7 and RACH resource indices are 0, 1,2 and 3, SS blocks # 2, # 4, # 5 and # 7 are mapped to RACH resources # 0, # 1, # 2 and # 3 respectively.
[0297] Indexing of RACH resources is performed in such a way that
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93/113 RACH resources are indexed in order of code resources in an index base time / frequency domain, indexing for code resources is performed at the same time, and then indexing is performed in ascending order of frequency and indexing resources runs in the order of code resources. Alternatively, indexing for frequency resources is performed at the same time and then indexing is performed for time resources.
[0298] After indexing for RACH resources is performed in a given order, the number of RACH resources may not correspond to the number of SS blocks at all times. In this case, the number of RACH resources is usually equal to or greater than the number of SS blocks. When there are RACH resources remaining after association with all ATSSs and thus there are RACH resources that are not associated with any SS block in a RACH resource configuration window or in a RACH interval pattern configuration window, the time / frequency resources Corresponding RACHs are not reserved for RACH resources. The UE does not assume that RACH is transmitted on the corresponding resources and the uphill link is transmitted all the time. If there is no RACH resource associated with a specific ATSS, that is, RACH resources are insufficient for the number of SS blocks, the network can transmit signaling to allow intervals adjacent to a specific interval included in the RACH interval pattern configuration for RACH resources such as RACH resources for the UE.
[0299] Here, a specific interval index and the number of intervals can be designated by signaling, and by the first interval in which SS blocks are not transmitted between intervals adjacent to the last of the intervals indicated implicitly in the RACH interval pattern configuration. or a specific range indicated as RACH resources.
[0300] Alternatively, the UE can additionally use RACH resources corresponding to the number of intervals in which
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94/113 RACH interval collides with ATSS information. When two intervals are used for transmission of SS blocks, the UE may use intervals, which are adjacent to the two intervals used for transmission of SS blocks within intervals indicated by the corresponding RACH interval pattern setting, such as intervals for RACH. The corresponding intervals must be intervals that are not used for transmission of SS blocks. When SS blocks are transmitted at a neighboring interval, an interval following the interval is selected. Processing for remaining RACH resources is performed in the same way as described above.
[0301] As another method for cases in which there are RACH resources that are not associated with any SS block, remaining RACH resources are mapped sequentially again from the first ATSS. That is, the number of RACH resources can be greater than the number of ATSSs and, preferably, a RACH resource is mapped k times by ATSS. In other words, ATSSs are cyclically associated with RACH resources k times. Referring to figure 26, when there are 3 ATSSs and 8 RACH resources, the 3 ATSSs are mapped to 3 RACH resources and mapped to the next 3 RACH resources again, and the remaining 2 RACH resources are not associated with the ATSSs. The number of ATSSs is related to the number of RACH resources in such a way that at least one RACH resource must be mapped by ATSS in a PRACH configuration window and an ATSS-RACH resource mapping pattern can be repeated k times according to a degree of freedom from the network. If there are remaining RACH resources even after ATSSs are mapped to RACH resources k times, the remaining RACH resources are not reserved for RACH resources. When the remaining RACH resources have an interval / mini-interval length, the UE performs DCI monitoring at the corresponding intervals. Here, k is a positive integer and can be a maximum number of times to map ATSSs to
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95/113 RACH resources. That is, k can be a base (the number of RACH resources / the number of ATSSs). In other words, ATSSs are repeatedly mapped to RACH resources by k which is a positive integer in the PRACH configuration window and remaining RACH resources are not effective as RACH resources.
[0302] Furthermore, a pattern in which each ATSS is mapped to at least one RACH resource can be repeated in the PRACH configuration window. This is described in detail using the example described above. When 3 ATSSs are mapped to 8 RACH resources twice in a PRACH configuration window of a specific duration and 2 RACH resources remain, 3 ATSSs are mapped sequentially to 8 RACH resources twice in the same pattern in a next duration PRACH configuration window and 2 remaining RACH resources are ineffective RACH resources and thus may not be reserved for RACH resources.
[0303] The PRACH configuration window can have the same duration as a PRACH configuration period unless there are special circumstances such as establishment of the PRACH configuration window by means of additional signaling. That is, the PRACH configuration window can be the same as the PRACH configuration period unless mentioned otherwise.
[0304] (3) ATSS indication through RRC signaling.
[0305] The aforementioned ATSS is information transmitted at the same time as the PRACH configuration is carried out and is transmitted via RMSI carrying most of the basic information of the system after PBCH transmission, that is, SIB1 / 2. However, this information needs to be disseminated to all UEs in a cell and causes considerable signal overload to indicate whether a maximum of 128 SS blocks is transmitted.
[0306] Therefore, information regarding ATSSs is transmitted in the form of a compressed bitmap instead of a total bitmap in the ISMS. The system
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96/113 provides accurate ATSS information for cell measurement serving after a random access procedure and ATSS information is transmitted via RRC. ATSS information received through ISMS may differ from ATSS information received through RRC. In this case, the ATSS information transmitted by means of RRC signaling takes precedence over the ATSS information transmitted by the ISMS. In this case, an additional factor needs to be considered for UE operation in relation to RACH resources.
[0307] A UE does not assume that a PUSCH / PUCCH and a downlink channel are transmitted / received in time / frequency resources allocated to RACH resources. Resources reserved for RACH have resource allocation priority immediately following resources on which SS blocks are transmitted. However, when the UE knows that some SS blocks among ATSSs received through ISMS were not actually transmitted using ATSS information transmitted via RRC, the UE releases all RACH resources associated with SS blocks that have not actually been transmitted . That is, it is assumed that a RACH preamble is not transmitted in the released resources. In addition, the released resources can be used as downlink resources. That is, the UE performs DCI monitoring on released resources / intervals.
[0308] 8. Resource allocation in RACH interval.
[0309] When information about RACH intervals is provided correctly, RACH resources in each RACH interval can be acquired based on a combination of a RACH preamble format and a subcarrier spacing indicated by Msg 1.
[0310] Furthermore, in order to signal correct positions of RACH resources at intervals, the network needs to signal RACH interval type information such as a symbol index of the start of a RACH resource, as shown in figure 27. Here, the start symbol index can be 0, 1 or 2. Although signaling
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97/113 RACH interval type information can be performed per RACH interval, it is more desirable to perform RACH interval type information signaling for all RACH intervals in order to reduce signaling overhead.
[0311] (1) Frequency domain configuration.
[0312] Frequency positions of RACH resources are signaled based on a part of initial bandwidth (BWP) for uplink on a part of bandwidth and on resource allocation information for RACH transmission.
[0313] (2) Allocation of RACH resources in RACH interval.
[0314] When a RACH preamble based on a short string is used, a plurality of RACH resources can be included in a single RACH range. In this case, RACH resources can be allocated consecutively or non-consecutively. Although non-consecutive allocation of RACH resources can be advantageous in terms of flexibility and reduced latency, the network needs to indicate which symbol is reserved for RACH. Therefore, it is desirable to allocate RACH resources consecutively over a RACH interval when considering resource efficiency and signaling overhead. That is, when a plurality of RACH resources are included in a RACH range, it is desirable that the RACH resources are arranged consecutively even though all the resources included in the RACH range are not used as RACH resources.
[0315] When RACH resources are consecutive, RACH B preamble format is applied to the last RACH resource among consecutive RACH resources in a RACH interval and RACH A / B preamble format is applied to the remaining RACH resources.
[0316] Furthermore, to support IIRLLC in NR, RACH intervals can be configured as follows.
[0317] - Option 1: Allocation of RACH resources in a RACH interval is
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98/113 configured based on a mini-gap and the length of the mini-gap is determined according to RMS I transmission in an idle mode or other system information.
[0318] - Option 2: A RACH interval pattern is determined based on a mini-interval and the mini-interval is supported by systems in idle mode.
[0319] - Option 3: Dynamic or semi-static signaling takes precedence over the configuration of RACH resources.
[0320] In the case of options 1 and 2, RACH resources are allocated consecutively in a mini-interval in a RACH interval and RACH resources are not allocated to a mini-interval following the mini-interval to which the RACH resources have been allocated consecutively. Furthermore, in the case of options 1 and 2, indexes of RACH resource start symbols included in a mini-interval to which RACH resources are allocated can be flagged or mini-intervals can have the same RACH resource allocation pattern in a RACH interval.
[0321] However, in the case of option 2, the number of RACH interval patterns increases as the number of mini-intervals included in a RACH interval increases, and thus the overhead to designate a RACH interval pattern may increase. Therefore, network signaling can take precedence over configuring RACH resources for dynamic resource utilization and flexibility. However, the method described above is not desirable because RACH resources are reserved in idle mode with high priority.
[0322] Association of RACH resources.
[0323] When RACH resource information is acquired, an SS block index associated with each RACH resource needs to be obtained. The simplest method for this is to signal the SS block index associated with each RACH resource. However, SS blocks need to be mapped to RACH resources using a predefined rule in order to reduce signaling overhead. For example, the rule
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The predefined 99/113 can be considered as a method of sequentially mapping SS blocks to groups of RACH resources in the time domain and mapping SS blocks actually transmitted to groups of RACH resources again.
[0324] (1) Derivation of effective RACH interval and effective RACH symbol.
[0325] Since RACH resources are mapped to RACH intervals according to a PRACH configuration independent of SS block temporal positions actually transmitted in TDD / FDD, a UE needs to be able to derive effective RACH intervals by combining information included in the PRACH configuration and information about SS blocks actually transmitted via ISMS. Furthermore, candidate slot positions for transmission of SS blocks are not always reserved for transmission of SS blocks. That is, information as to whether each SS block is actually transmitted is indicated by RMSI, that is, SS block information actually transmitted, as previously described.
[0326] In other words, the UE needs to be able to combine information about SS blocks actually transmitted through ISMS and PRACH configuration information and derive effective RACH intervals when considering predefined rules.
[0327] Furthermore, when the UE derives effective RACH intervals, the UE must be able to derive effective RACH symbols based on a signaled RACH preamble format and specified RACH interval start symbol indices for all cells. In addition, a symbol indicated as a rising link by means of an interval format indication (SFI) can be an effective RACH symbol, so the UE needs to derive effective RACH symbols when considering SFI. Here, effective RACH symbols must satisfy the number of consecutive symbols defined by the RACH preamble format. In addition, a single set of effective RACH symbols can be defined as a single RACH occasion.
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100/113 [0328] Furthermore, since it is necessary to determine whether RACH resources are always allocated consecutively in a RACH interval and if the number of RACH occasions per RACH interval is identical for all RACH intervals, explicit signaling needs to be performed when the number of RACH occasions per RACH range is different for cells. In addition, in order to calculate a total number of RACH occasions by the UE, the network needs to signal the number of RACH resources multiplexed by frequency division through the RACH configuration index in the regions of two-dimensional time / frequency resources.
[0329] (2) Rule to map effective RACH resources or effective RACH occasions to SS blocks.
[0330] If a total number of RACH occasions that can be allocated within a PRACH configuration period is determined, a method of mapping SS blocks to RACH occasions needs to be determined. If the number of RACH occasions per SS block is one, that is, if SS blocks are mapped one by one for RACH occasions, the method of mapping SS blocks to RACH occasions can be easily determined because SS blocks can be mapped sequentially to RACH occasions . Similarly, when there are frequency division multiplexed RACH occasions, it is desirable to map SS blocks to frequency division multiplexed RACH occasions first and then map SS blocks to time domain RACH occasions. Here, a time period of RACH occasions needs to be established according to a PRACH configuration period.
[0331] Figure 28 shows a case in which a RACH preamble format having a length of 4 symbols, 4 RACH occasions in a time interval and a start symbol index of 2 are assumed. A mapping relationship between SS blocks and RACH occasions is described with reference to figure 28. When frequency division multiplexed RACH occasions are present, a method of mapping SS blocks to the frequency axis and then map SS blocks to the axis
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101/113 of time can be used.
[0332] A standard RACH resource mapping period is determined based on actually transmitted SS blocks and a rule mapping SS blocks for effective RACH occasions, so the standard RACH resource mapping period may differ from the PRACH configuration period .
[0333] To create a more general mapping rule, the following parameters can be assumed.
[0334] - X: The total number of RACH occasions.
[0335] - NssB_ _P r_Ro: The number of SS blocks per RACH occasion.
[0336] - Nseq_per_ssB_per_Ro: The number of CBRA preambles per SS block in relation to the RACH transmission occasions.
[0337] - Μ: The number of RACH occasions per SS block. M is acquired through Nseq_ _per_SSB / Nseq_per_SSB_per_RO.
[0338] - Fd: The number of RACH occasions that can be mapped simultaneously to an SS block.
[0339] 1) When M> 1.
[0340] When an SS block is mapped to a plurality of RACH occasions, that is, one to many mapping is performed, the value M is an integer corresponding to M> 1, and Fd = 1, M RACH occasions multiplexed by time division can be mapped sequentially to an SS block.
[0341] In other words, when 1 / M, which is the number of SS blocks per RACH occasion, is less than 1, an SS block can be mapped to M RACH occasions. Here, RACH occasions mapped to an SS block can be consecutive RACH occasions.
[0342] If Fd> 1, M RACH occasions are mapped to an SS block in a first frequency and next time mode. Preferably, when M is a multiple of Fd, a single SS block can be mapped to RACH occasions
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102/113 multiplexed by frequency division for a predetermined time. If a plurality of SS blocks are mapped to a RACH occasion within the same time, a direction in which the network can receive beams simultaneously corresponding to the plurality of SS blocks needs to be guaranteed.
[0343] The previous description is summarized as shown in Table 13.
[0344] Table 13
M = 1 M> 1 Fd = 1 Each SSB is mapped to an RO in a time domain sequential mode. An SSB is associated with TDMed NRo_ _P er_ssB occasions RACH. Fd> 1 Each SSB is mapped to an RO in first frequency and next time mode according to the sequential order of SSB index. A SSB is associated with NRo_ er_ssB _P RACH occasions. RACH occasions are mapped to an SSB in first frequency and next time mode according to the sequential order of SSB index.
[0345] 2) When M <1.
[0346] A case in which a plurality of SS blocks is mapped to a RACH occasion, that is, many to one mapping is performed, is described. If 0 <M <1, 1 / M = N where N is defined as the number of SS blocks mapped to a RACH occasion, and it is assumed that a plurality of SS blocks is multiplexed by code division on a RACH occasion and directions beams corresponding to the plurality of SS blocks are directions in which the network can simultaneously receive the beams corresponding to the SS blocks.
[0347] If a maximum number of RACH preamble indexes, such as 64, is allocated for a RACH occasion, RACH preambles mapped to SS blocks can be mapped in comb type to increase RACH reception performance on the assumption that RACH preambles are received according to multiple access by spatial division (SDM). In other words, if 2 SS blocks are mapped to a RACH occasion, other indexes of RACH preambles are mapped to the 2 SS blocks. Here, to improve reception performance of
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103/113 preamble RACH, actual cyclical offsets allocated per SS block are defined as N * Ncs.
[0348] However, when a plurality of SS blocks are associated with a RACH occasion, CBRA preamble indices for each SS block can be mapped non-consecutively to improve RACH performance. Furthermore, mapping a plurality of SS blocks to multiple RACH occasions can be considered, but this mapping method causes implementation complexity and therefore it is preferable to exclude the mapping method from the types of mappings.
[0349] (4) Rule to map RACH resource to RACH preamble.
[0350] Since a maximum number of RACH preambles per RACH resource and per RACH resource group is limited, RACH preambles need to be allocated to a RACH resource / RACH resource group in a direction in which a cyclic root index offset increases, a root index increases and the time domain increases. Here, a start root index mapped to the first RACH resource needs to be flagged.
[0351] A common RACH preamble format needs to be applied to all RACH resources for the same number of repetitions because there is no reason to use different RACH preamble formats for RACH resources when considering target cell coverage for at least one RACH procedure in the idle state.
[0352] 1) Mode 1: The number of RACH preambles per RACH or SS block.
[0353] Information regarding RACH preambles and a range of supported RACH preamble values that a UE needs to know in order to map RACH preambles for RACH occasions is shown in Table 14. Furthermore, the UE can calculate the number of RACH preambles on the occasion RACH based on
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104/113 number of RACH preambles per SS block for contention-based random access (CBRA) and the number of RACH occasions per SS block and signal the number of RACH occasions per SS block.
[0354] Table 14
Parameter Value Explanation for current suggestion Number of PRACH preambles to CBRA per SSB {4, 6, 8, 16, 24,32, 48, 64} This parameter is explicitly flagged by ISMS Number of PRACH preambles for CBRA and CBRA per SSB {8, 16, 32, 64} This parameter is explicitly flagged by ISMS Maximum number of PRACH preambles for CBRA per RACH occasion {[64]} This parameter is not flagged explicitly. Instead, the SSB number associated with a RACH occasion is flagged either explicitly or implicitly, which is related to the preamble pratch mapping rule. Maximum number of PRACH preambles forCBRA and CBRA on the occasion of RACH {[64], [128 or 256]} The maximum number of PRACH preambles per RACH occasion must be determined for FAST size, and [64] can be considered as a baseline.The large number (for example, 128, 256) can be used only for beam recovery or any other purpose (with a lower CS value and lightly loaded scenario). Configuration of RACH resources is performed separately for beam recovery, not by ISMS, and this is provided for the purpose of the same configuration structure.
[0355] When M> 1, the number of RACH preambles for CBRA per occasion
RACH is calculated as a value obtained by dividing the number of RACH preambles for CBRA per SS block by M. Here, if there is a non-zero remainder, RACH preambles that are not mapped to RACH occasions are allocated to a RACH occasion having an index maximum or minimum associated with SS blocks. Alternatively, RACH preambles can be mapped to RACH occasions by
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105/113 using a circular scheduling method. For example, when the number of RACH preambles per SS block is 48 and the number of RACH occasions mapped to an SS block is 4, the number of preambles per RACH occasion is 12. If the number of RACH preambles per SS block is 48 and the number of RACH occasions mapped to an SS block is 5, at least 9 RACH preambles can be used per RACH occasion. The remaining 3 RACH preambles can be mapped sequentially to indexes of RACH occasions in first frequency and next time mode for each RACH occasion mapped to the SS block.
[0356] When M <1, if a plurality of SS blocks are mapped to a RACH occasion and the same RA-RNTI is shared by the plurality of SS blocks, the maximum number of RACH preambles per RACH occasion is 64 FAST. If the sum of RACH preambles for the plurality of SS blocks is not greater than 64, the UE may use the number of RACH preambles per SS block for a signaled RACH occasion. However, if the sum of RACH preambles for the plurality of SS blocks is greater than 64, numbers of RACH preambles that can be used by the UE can be recalculated in such a way that the number of RACH preambles per SSB on the RACH occasion does not exceed 64. For example, when M is 1/4 and the number of RACH preambles per SS block is 16, the sum of RACH preambles per SS block for 4 SS blocks does not exceed 64, so 16 preambles per RACH occasion are used. That is, if M is 1/4 and the number of RACH preambles per SS block is 32, the number of RACH preambles per SS block for an RACH occasion needs to be limited to 16.
[0357] When a plurality of SS blocks are mapped to a RACH occasion, that is, M <1, RA-RNTI can be allocated per SS block at the same time / frequency position. In other words, when M is 1/4 and the number of RACH preambles per SS block is 32, 32 * 4 RACH preambles can be used for an RACH occasion having RA-RNTI specific to SS blocks, and thus different RARs
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106/113 are generated for SS blocks in relation to the RACH occasion. This concerns a method of calculating RA-RNTI regardless of whether a virtual SS block index is calculated.
[0358] 2) Mode 2: Method of mapping SS blocks and RACH occasions to RACH preamble indexes.
[0359] The number of RACH preambles per SS block and the number of RACH preambles per RACH occasion are determined according to a RACH preamble index mapping rule. indexes of RACH preambles are mapped into a group of RACH resources. If a single SS block is associated with a group of RACH resources, the indexes of RACH preambles are mapped to RACH occasions associated with SS blocks.
[0360] When M> 1, if the number of RACH preambles per RACH occasion is Npreamble_occasion and each RACH occasion has the index #n (n = 0, 1, ..., M-1), an umpteenth RACH occasion has the preamble indexes RACH {0 to (Npreamble_occasion-1) + (n * Npreamble_occasion)}.
[0361] Conversely, when M <1, if RA-RNTI is shared by SS blocks on one RACH occasion and the calculated number of RACH preambles per SS block is Npreamble_SSB, the RACH preamble indices {0 to (Npreamble_SSB1) + ( m * Npreamble_SSB)} are allocated to an SS block of order m. Here, m is an SS block index reordered based on actually transmitted SS blocks. Furthermore, a RACH occasion can have values from 0 to Npreamble_occasion as indexes of RACH preambles to Npreamble_occasion. Here, Npreamble_occasion can be 64.
[0362] However, RA-RNTI is allocated per SS block and the RACH preamble indices {0 to (Npreamble_SSB-1)} are allocated per SS block. The number of RACH preambles that can be associated with a RACH occasion can be m * Npreamble_SSB. Here, m is the number of SS blocks mapped to the occasion
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107/113
RACH and Npreamble_SSB is the number of RACH preambles per SS block and can be acquired through signaling.
[0363] 3) Mode 3: Method of mapping RACH occasion / SS block to RACH preamble.
[0364] Basically, RACH preambles are allocated to RACH occasions in a direction in which a cyclic shift of the root index increases and a root index increases. If a group of RACH resources is made up of time division multiplexed RACH occasions with Fd = 1, RACH preambles can be allocated to the RACH resource group in a direction in which the root index cyclic offset increases, the root index increases and the time domain increases, that is, a RACH occasion index increases.
[0365] Furthermore, if a RACH resource group is made up of time division multiplexed RACH occasions with Fd> 1, RACH preambles can be allocated to the RACH resource group in a direction in which the cyclic index shift of root increases, the root index increases, the frequency domain increases and the time domain increases.
[0366] If a sequence of RACH preambles can be different for different groups of RACH resources, RACH preambles can generally be allocated in a direction in which the cyclic root index offset increases, the root index increases and, when Fd> 1, the frequency domain increases and the time domain increases.
[0367] (5) The total number of RACH occasions in the PRACH configuration period.
[0368] The total number of RACH occasions can be calculated by multiplying the number of RACH intervals in a subframe, the number of RACH occasions in a RACH interval, the number of subframes per PRACH configuration index, the number of RACH occasions multiplexed by frequency division in an instance
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108/113 of time indicated by a 2-bit value and a PRACH configuration period that are included in the PRACH configuration.
[0369] Furthermore, the UE can derive the total number of RACH occasions in the two-dimensional time / frequency domain based on the information mentioned above.
[0370] However, the total number of RACH occasions may not be exactly the same as the number of RACH occasions required to be associated with SS blocks actually transmitted in the PRACH configuration period. When the total number of RACH occasions is greater than the number of required RACH occasions, the remaining RACH occasions are not used as RACH occasions and are used for transmitting uphill link data. When the total number of RACH occasions is less than the number of required RACH occasions, this needs to be recognized by the network as a configuration error and this type of configuration needs to be avoided.
[0371] Figure 29 is a block diagram illustrating components of a transmission device 10 and a receiving device 20 that implement the present disclosure.
[0372] The transmitting device 10 and the receiving device 20, respectively, include radio frequency (RF) units 13 and 23 that transmit or receive radio signals carrying information and / or data, signals and messages, memories 12 and 22 that store various types of information related to communication in a wireless communication system, and processors 11 and 21 that are operationally coupled to components such as RF units 13 and 23 and memories 12 and 22, and that control memories 12 and 22 and / or RF units 13 and 23 to perform at least one of the modalities set out above in the present disclosure.
[0373] Memories 12 and 22 can store programs for
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109/113 processing and control of processors 11 and 21, and temporarily store input / output information. Memories 12 and 22 can be used as temporary stores.
[0374] Processors 11 and 21 generally provide full control for the operations of various modules in the transmitting device or the receiving device. In particular, processors 11 and 21 can perform various control functions to implement the present disclosure. Processors 11 and 21 can be called controllers, microcontrollers, microprocessors, microcomputers and so on. Processors 11 and 21 can be realized by means of various devices such as, for example, hardware, firmware, software or a combination thereof. In a hardware configuration, processors 11 and 21 can be provided with application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), arrays field programmable ports (FPGAs), etc. In a firmware or software configuration, firmware or software can be configured to include a module, procedure, function or the like. The firmware or software configured to implement the present disclosure can be provided on processors 11 and 21, or can be stored in memories 12 and 22 and executed by processors 11 and 21.
[0375] Processor 11 of transmission device 10 performs predetermined encoding and modulation of a signal and / or data that is scaled by processor 11 or by a scaler connected to processor 11 and which will be transmitted abroad, and then transmits the signal and / or data encoded and modulated for RF unit 13. For example, processor 11 converts a transmission data stream to K layers after demultiplexing, channel coding, scrambling, modulation and so on. The encoded data stream is
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110/113 referred to as a code word, equivalent to a data block provided by the MAC layer, that is, a transport block (TB). A TB is encoded to a code word, and each code word is transmitted in the form of one or more layers to the receiving device. For upward frequency conversion, the RF unit 13 may include an oscillator. The RF unit 13 can include Nt transmission antennas (Nt is a positive integer equal to or greater than 1).
[0376] The signal processing of the receiving device 20 is configured to be the reverse of the signal processing of the transmitting device 10. The RF unit 23 of the receiving device 20 receives a radio signal from the transmitting device 10 under control of processor 21. RF unit 23 may include Nr receiving antennas, and retrieves a received signal via each of the receiving antennas to a baseband signal by way of frequency downward conversion. For downward frequency conversion, the RF unit 23 may include an oscillator. The processor 21 can retrieve the original data that the transmitting device 10 intends to transmit by decoding and demodulating radio signals received via the receiving antennas.
[0377] Each of the RF units 13 and 23 can include one or more antennas. The antennas transmit signals processed by RF units 13 and 23 to the outside, or receive radio signals from outside and supply the received radio signals to RF units 13 and 23 under the control of processors 11 and 21 according to a modality of present revelation. An antenna can also be called an antenna port. Each antenna can correspond to a physical antenna or can be configured to be a combination of two or more physical antenna elements. A signal transmitted by each antenna may not be further decomposed by the receiving device 20. An RS transmitted in correspondence with a corresponding antenna defines an antenna seen from the side of the receiving device 20, and enables the receiving device 20 to perform channel estimation. for the antenna,
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111/113 regardless of whether a channel is a single radio channel from a physical antenna or a channel composed of a plurality of physical antenna elements including the antenna. That is, the antenna is defined in such a way that a channel carrying a symbol about the antenna can be derived from the channel carrying another symbol about the same antenna. In the case of an RF unit supporting MIMO in which data is transmitted and received via a plurality of antennas, the RF unit can be connected to two or more antennas.
[0378] In the present disclosure, RF units 13 and 23 can support BF reception and BF transmission. For example, RF units 13 and 23 can be configured to perform the exemplary functions described above with reference to figures 5 to 8 in the present disclosure. Furthermore, RF units 13 and 23 can be referred to as transceivers.
[0379] In disclosure modalities, a UE operates as the transmission device 10 in UL, and as the receiving device 20 in DL. In the disclosure modalities, the gNB operates as the receiving device 20 in UL, and as the transmitting device 10 in DL. Next, a processor, an RF unit and a memory in a UE are referred to as an UE processor, an RF EU unit and an UE memory, respectively, and a processor, an RF unit and a memory in a gNB are referred to as a gNB processor, an RF gNB unit and a gNB memory, respectively.
[0380] The gNB processor of the present disclosure can transmit information about ATSSs and RACH configuration information about RACH resources to a UE. Upon receipt of a RACH on a RACH resource, gNB can acquire information about SSBs corresponding to the synchronization that the UE intends to acquire based on the RACH resource on which the RACH was transmitted. That is, the gNB processor is capable of knowing information about SSBs corresponding to selected beams when measuring, by UE, ATSSs having the
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112/113 highest RSRP value among ATSSs based on the RACH resource on which the RACH was transmitted. Therefore, the gNB processor cannot receive a RACH through RACH resources that are not mapped to ATSSs.
[0381] The UE processor in this disclosure maps ATSSs to RACH resources based on ATSS information and information about RACH resources received from a gNB and transmits a RACH on a RACH resource mapped to an SSB having the highest RSRP value selected. number of SSBs received based on ATSS information. Therefore, the UE does not transmit a RACH on RACH resources that are not mapped to ATSSs.
[0382] On RACH resources that are not mapped to ATSSs, upward link transmission other than RACH resource transmission may occur or downlink link reception may be performed.
[0383] Here, the UE processor repeatedly maps ATSSs to RACH resources by a positive integer multiple of the number of ATSSs in a RACH configuration period and does not transmit a RACH through remaining RACH resources after mapping. Furthermore, the number of times to repeatedly map ATSSs can be equal to the largest integer among integers less than the value obtained by dividing the number of RACH resources by the number of ATSSs. Furthermore, when the number of SSBs that can be mapped to RACH resources is less than 1, an SSB is mapped to as many consecutive RACH resources as a reciprocal of the number.
[0384] The gNB processor or the UE processor of the present disclosure can be configured to implement the present disclosure in a cell operating in a high frequency band at 6 GHz or above where analog BF or hybrid BF is used.
[0385] As explained above, a detailed description has been given of preferred embodiments of the present disclosure so that those skilled in the art
Petition 870190108796, of 10/25/2019, p. 119/128
113/113 can implement and execute the present disclosure. Although reference has been made above to the preferred embodiments of the present disclosure, those skilled in the art will understand that various modifications and changes can be made to the present disclosure within the scope of the present disclosure. For example, those skilled in the art can use the components described in the modalities set out above in combination. The modalities previously exposed, therefore, must be interpreted in all aspects as illustrative and not restrictive. The scope of the disclosure must be determined by the appended claims and their legal equivalences, and not by the previous description, and all changes being within the meaning and equivalence range of the appended claims are considered to be covered by them.
INDUSTRIAL APPLICABILITY [0386] Although the method for transmitting and receiving a random access channel and the apparatus for this have been described with a focus on examples in which they are applied for NewRAT 5G, the method and apparatus can be applied for various communication systems wireless in addition to NewRAT 5G.

权利要求:
Claims (19)
[1]
1. Method for transmitting a random access channel (RACH) through user equipment (UE) in a wireless communication system, FEATURED by the fact that it comprises:
receiving first information related to the transmission of at least one synchronization signal block (SSB), and second information related to (i) a plurality of RACH resources in which to transmit RACH, and (ii) a period of time within which to transmit RACH in the plurality of RACH resources;
determining a mapping of at least one SSB to at least one first RACH resource between the plurality of RACH resources within the time period, where the mapping comprises repeated mappings of at least one SSB over at least one first RACH resource by a number positive integer of times within the time period; and transmitting RACH on a RACH resource between at least one first RACH resource that is mapped to at least one SSB, where the plurality of RACH resources further comprises at least one second RACH resource that remains unmapped to at least one SSB after the positive integer of repeated mappings from at least one SSB over at least one first RACH resource; and where RACH is not transmitted on at least one second RACH resource that remains unmapped to at least one SSB.
[2]
2. Method according to claim 1, CHARACTERIZED by the fact that in a state where the number of SSBs that can be mapped by RACH resource is less than 1, an SSB is mapped to as many consecutive first RACH resources as one reciprocal of the number of SSBs that can be mapped by RACH resource.
[3]
3. Method, according to claim 1, CHARACTERIZED by the fact that
Petition 870190108796, of 10/25/2019, p. 121/128
2/7 that the repeated mappings of at least one SSB over at least one first RACH resource by the positive integer number of times within the time period comprises:
each SSB out of at least one SSB being mapped k times over at least one first RACH resource within the time period, where k is the positive integer number of times for repeated mappings.
[4]
4. Method, according to claim 3, CHARACTERIZED by the fact that at least one SSB is mapped to k different groups of first RACH resources among the at least one first RACH resource.
[5]
5. Method according to claim 3, CHARACTERIZED by the fact that at least one second RACH resource remains unmapped to at least one SSB after each SSB out of at least one SSB is mapped k times over at least one first RACH resource within the time period.
[6]
6. User equipment (UE) configured to transmit a random access channel (RACH) in a wireless communication system, CHARACTERIZED by the fact that it comprises:
a transceiver;
at least one processor; and at least one computer memory that operably connects to at least one processor and stores instructions that, when executed, cause at least one processor to perform operations comprising:
receive, through the transceiver, first information related to the transmission of at least one block of synchronization signal (SSB), and second information related to (i) a plurality of RACH resources, which to transmit the RACH, and (ii) a period of time within which to transmit RACH in the plurality of RACH resources;
determine a mapping from at least one SSB to at least one
Petition 870190108796, of 10/25/2019, p. 122/128
3/7 first RACH resource among the plurality of RACH resources within the time period, where the mapping comprises repeated mappings of at least one SSB over at least one first RACH resource for a positive integer number of times within the time period ; and transmit, through the transceiver, the RACH on a RACH resource from at least one first RACH resource that is mapped to at least one SSB, where the plurality of RACH resources further comprises at least one second RACH resource that remains unmapped for at least one SSB after the positive integer of repeated mappings from at least one SSB over at least one first RACH resource; and in which the RACH is not transmitted by the UE on at least one second RACH resource which remains unmapped to the at least one SSB.
[7]
7. User equipment according to claim 6, CHARACTERIZED by the fact that in a state in which the number of SSBs that can be mapped by RACH resource is less than 1, an SSB is mapped to as many consecutive RACH resources as a reciprocal of the number of SSBs that can be mapped by RACH resource.
[8]
8. User equipment according to claim 6, CHARACTERIZED by the fact that the repeated mappings of at least one SSB over at least one first RACH resource by the positive integer number of times within the time period comprises:
each SSB out of at least one SSB being mapped k times over at least one first RACH resource within the time period, where k is the positive integer number of times for repeated mappings.
[9]
9. User equipment according to claim 8, CHARACTERIZED by the fact that at least one SSB is mapped to k different groups of first RACH resources from at least one first
Petition 870190108796, of 10/25/2019, p. 123/128
4/7 RACH feature.
[10]
10. User equipment according to claim 8, CHARACTERIZED by the fact that at least one second RACH resource remains unmapped to at least one SSB after each SSB out of at least one SSB is mapped k times over the hair least one first RACH resource within the time period.
[11]
11. Method for receiving a random access channel (RACH) by a base station from a user equipment (UE) in a wireless communication system, FEATURED by the fact that it comprises:
transmit, to the UE, first information related to the transmission of at least one synchronization signal block (SSB), and second information related to (i) a plurality of RACH resources which the UE is for transmitting the RACH, and (ii ) a period of time within which the UE is to transmit the RACH in the plurality of RACH resources;
determining a mapping of at least one SSB to at least one first RACH resource among the plurality of RACH resources within the time period, where the mapping comprises repeated mappings of at least one SSB over at least one first RACH resource by a number positive integer of times within the time period; and receive, from the UE, the RACH on a RACH resource among at least one first RACH resource that is mapped to at least one SSB, where the plurality of RACH resources further comprises at least one second RACH resource that remains unused. mapped to at least one SSB after the positive integer of repeated mappings from at least one SSB over at least one first RACH resource; and in which the RACH is not transmitted by the UE on at least one second RACH resource which remains unmapped to the at least one SSB.
Petition 870190108796, of 10/25/2019, p. 124/128
5/7
[12]
12. Method, according to claim 11, CHARACTERIZED by the fact that it further comprises:
acquire, based on the first RACH resource, from which the RACH was received, information related to at least one SSB that corresponds to a synchronization to be acquired by the UE.
[13]
13. Method according to claim 11, CHARACTERIZED by the fact that the repeated mappings of at least one SSB over at least one first RACH resource by the positive integer number of times within the time period comprises:
each SSB out of at least one SSB being mapped k times over at least one first RACH resource within the time period, where k is the positive integer number of times for repeated mappings.
[14]
14. Method, according to claim 13, CHARACTERIZED by the fact that at least one SSB is mapped to k different groups of first RACH resources among at least one first RACH resource.
[15]
15. Method according to claim 13, CHARACTERIZED by the fact that at least one second RACH resource remains unmapped to at least one SSB after each SSB out of at least one SSB is mapped k times over at least one first RACH resource within the time period.
[16]
16. Base station (BS) configured to receive, from a user equipment (UE), a random access channel (RACH) in a wireless communication system, CHARACTERIZED by the fact that it comprises:
a transceiver, at least one processor, and at least one computer memory operably connectable to at least one processor and storing instructions that, when executed, cause at least one processor to perform operations comprising:
Petition 870190108796, of 10/25/2019, p. 125/128
6/7 transmit, through the transceiver and to the UE, first information related to the transmission of at least one synchronization signal block (SSB), and second information related to (i) a plurality of RACH resources which the UE is for transmit the RACH, and (ii) a period of time within which the UE is to transmit the RACH in the plurality of RACH resources;
determining a mapping of at least one SSB to at least one first RACH resource among the plurality of RACH resources within the time period, where the mapping comprises repeated mappings of at least one SSB over at least one first RACH resource by a number positive integer of times within the time period; and receive, through a transceiver and from the UE, the RACH in a RACH resource among the at least one first RACH resource that is mapped to the at least one SSB, where the plurality of RACH resources still comprises at least one second RACH resource that remains unmapped to at least one SSB after the positive integer of repeated mappings from at least one SSB over at least one first RACH resource; and where RACH is not transmitted by the UE on at least one second RACH resource which remains unmapped to at least one SSB.
[17]
17. Base station, according to claim 16, CHARACTERIZED by the fact that the repeated mappings of at least one SSB over at least one first RACH resource by the positive integer number of times within the time period comprises:
each SSB out of at least one SSB being mapped k times over at least one first RACH resource within the time period, where k is the positive integer number of times for repeated mappings.
[18]
18. Base station, according to claim 17, CHARACTERIZED by
Petition 870190108796, of 10/25/2019, p. 126/128
7/7 the fact that at least one SSB is mapped to k different groups of first RACH resources from at least one first RACH resource.
[19]
19. Base station according to claim 17, CHARACTERIZED by the fact that at least one second RACH resource remains unmapped to at least one SSB after each SSB out of at least one SSB is mapped k times over at least a first RACH resource within the time period.

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法律状态:
2021-10-19| B350| Update of information on the portal [chapter 15.35 patent gazette]|

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