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    • 专利摘要:
    the present invention relates to a method for receiving a synchronization signal block by an eu in a wireless communication system. in particular, the method includes receiving at least one ssb mapped to a plurality of symbols, where two regions for candidate ssbs in which at least one ssb can be received are allocated in a specific length of time including the plurality of symbols, and a time between the two regions, a time before the two regions and a time after the two regions are identical in the specific length of time.
    公开号:BR112019000576A2
    申请号:R112019000576
    申请日:2018-06-07
    公开日:2020-01-21
    发明作者:Kim Eunsun；Park Haewook；Ko Hyunsoo；Kim Kijun；Yoon Sukhyon；Kim Youngsub
    申请人:Lg Electronics Inc；
    IPC主号:
    专利说明:

    “METHOD FOR TRANSMITTING AND RECEIVING SYNCHRONIZATION SIGNAL BLOCK AND APPLIANCE FOR THE SAME”
    FIELD OF TECHNIQUE [001] The present description relates to a method for transmitting and receiving a synchronization signal block and an apparatus for that purpose, and more specifically, a method for varying the positions in which a signal block of synchronization can be transmitted when a numerology for the sync signal block differs from a numerology for data to transmit and receive the sync signal block and an apparatus for that purpose.
    THE INVENTION BACKGROUND [002] As more and more communication devices require more communication traffic along with current trends, one 5 â system generation (5G) of future generation is needed to provide a broadband communication enhanced wireless in compared to the legacy LTE system. In the future generation 5G system, the communication scenarios are divided into enhanced mobile broadband (eMBB), low-latency and ultra-reliable communication (URLLC), massive machine-type communication (mMTC), and so on.
    [003] Here, 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, and 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, short package, and massive connectivity (for example, Internet of things (loT)).
    SUMMARY OF THE INVENTION [Technical Problem]
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    2/55 [004] An objective of the present description is to provide a method for transmitting and receiving a synchronization signal block and an apparatus for this purpose.
    [005] Those skilled in the art will appreciate that the objectives that could be achieved with the present description are not limited to what was particularly described above and the objectives above and others that this description could achieve will be more clearly understood from the following detailed description .
    [Technical Solution] [006] A method for receiving a synchronization signal block (SSB) by a UE in a wireless communication system according to an embodiment of the present description includes receiving at least one SSB mapped to a plurality of symbols , where two regions for candidate SSBs in which at least one SSB can be received are allocated in a specific length of time including the plurality of symbols, where a time between the two regions, a time before the two regions and a time after the two regions are identical in the specific length of time.
    [007] Here, SSB candidates can be eliminated consecutively by a first number in each of the two regions.
    [008] Here, candidate SSBs can be consecutively arranged by a first number in each of the two regions.
    [009] In addition, 4 symbols can be included at the same time when a spacing between SSB subcarriers is a first value, and 8 symbols can be included at the same time when the spacing between SSB subcarriers is a second value.
    [010] In addition, regions for candidate SSBs may be consecutively arranged by a second number in units of the specific time duration in a half-frame and then consecutively arranged again by the second number after a predetermined time.
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    3/55 [011] In addition, regions for candidate SSBs can be consecutively arranged by the second number in units of specific time duration when the spacing between SSB subcarriers is the first value, regions being repeatedly arranged four times in an interval predetermined time.
    [012] In addition, the number of intervals included in the predetermined time can be 2 when the spacing between SSB subcarriers is the first value and the number of intervals included in the predetermined time can be 4 when the spacing between SSB subcarriers is the second value.
    [013] In addition, a frequency range in which the UE operates can be equal to or greater than a specific value.
    [014] In addition, the identical time can consist of two symbols.
    [015] Furthermore, the specific length of time over which the two regions are allocated can be repeatedly arranged by a specific number determined based on the frequency band in which the UE operates in a localized manner within a half-frame.
    [016] In addition, the specific number can be 2 when the frequency band in which the UE operates is equal to or less than the specific value and 4 when the frequency band in which the UE operates is greater than the specific value .
    [017] A UE that receives a synchronization signal block (SSB) in a wireless communication system according to the present description includes: a transceiver for transmitting / receiving signals to / from a base station; and a processor connected to the transceiver to control the transceiver to receive at least one SSB mapped to a plurality of symbols, where two regions for candidate SSBs in which at least one SSB can be received are allocated in a specific length of time including the plurality of symbols, where a time between the two regions, a time before the two regions and a time after the two regions
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    4/55 regions are identical in the specific length of time.
    [018] A method for transmitting a synchronization signal block (SSB) through a base station in a wireless communication system according to one embodiment of the present description includes transmitting at least one SSB mapped to a plurality of symbols, where two regions for candidate SSBs in which at least one SSB can be received are allocated in a specific length of time including the plurality of symbols, where a time between the two regions, a time before the two regions and a time after the two regions are identical in the specific length of time.
    [019] A base station that transmits a synchronization signal block (SSB) in a wireless communication system according to the present description includes: a transceiver for transmitting / receiving signals to / from a UE; and a processor connected to the transceiver to control the transceiver to transmit at least one SSB mapped to a plurality of symbols, where two regions for candidate SSBs in which at least one SSB can be received are allocated in a specific length of time including the plurality of symbols, where a time between the two regions, a time before the two regions and a time after the two regions are identical in the specific length of time.
    ADVANTAGEOUS EFFECTS [020] According to the present description, it is possible to efficiently control the transmission and reception of control information for data transmission, even a numerology for a synchronization signal block differing from a numerology for data.
    [021] It will be appreciated by those skilled in the art that the effects that could be achieved with the present description are not limited to what was particularly described above and other advantages of the present description will be more clearly understood from the following detailed description taken together
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    5/55 with the attached drawings.
    BRIEF DESCRIPTION OF THE DRAWINGS [022] Figure 1 is a view that illustrates the architecture of the control plan and user plan of radio interface protocols between a user equipment (UE) and an evolved UMTS terrestrial radio access network (E-UTRAN) according to a standard network access via radio partnership project of 3 â generation (3GPP).
    [023] Figure 2 is a view that illustrates physical channels and a general method of signal transmission using the physical channels in a 3GPP system.
    [024] Figure 3 is a view that illustrates a radio frame structure for transmitting a synchronization signal (SS) in a long-term evolution (LTE) system.
    [025] Figure 4 is a view that illustrates an exemplary interval structure available in the new radio access technology (NR).
    [026] Figure 5 is a view illustrating exemplary connection schemes between transceiver units (TXRUs) and antenna elements.
    [027] Figure 6 is a view that abstractly illustrates a hybrid beam-forming structure in terms of TXRUs and physical antennas.
    [028] Figure 7 is a view that illustrates the scanning of the beam for a synchronization signal and system information during downlink transmission (DL).
    [029] Figure 8 is a view that illustrates an example cell in an NR system.
    [030] Figures 9 to 14 show examples of SS burst configuration according to a spacing between SSB subcarriers.
    [031] Figures 15 to 29 show examples of configuring candidate SSBs in bursts of SS.
    [032] Figures 30 and 31 show examples of indication of ATSSs between
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    6/55
    Candidate SSBs.
    [033] Figure 32 is a block diagram of a communication device according to an embodiment of the present description.
    DETAILED DESCRIPTION [034] The configuration, operation and other characteristics of this description will be easily understood with the modalities of this description described with reference to the attached drawings. The embodiments of the present disclosure as set forth herein are examples in which technical features of the present disclosure are applied to a third generation partnership project systems (3GPP).
    [035] Although the modalities of this description are described in the context of the long-term evolution (LTE) and advanced LTE (LTE-A) systems, they are purely exemplary. Therefore, the modalities of this description are applicable to any other communication system, as long as the above definitions are valid for the communication system.
    [036] The term Base Station (BS) can be used to cover the meanings of terms including remote radio head (RRH), evolved Node B (eNB or eNode B), transmission point (TP), reception point (RP ), relay, and so on.
    [037] 3GPP communication standards define physical downlink channels (DL) corresponding to resource elements (REs) that carry information originating from an upper layer, and physical DL signals that are used in the physical layer and correspond to REs that they do not carry information originating from an upper layer. For example, shared physical downlink channel (PDSCH), physical broadcast channel (PBCH), physical multicast channel (PMCH), physical control format indicator channel (PCFICH), physical downlink control channel (PDCCH), and physical channel indicating the hybrid ARQ (PHICH) are defined as channels
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    7/55 physical DL, and the reference signals (RSs) and synchronization signals (SSs) are defined as physical DL signals. An RS, also called a pilot signal, is a signal with a predefined special waveform, known by both gNode B (gNB) and UE. For example, cell specific RS, EU specific RS (UE-RS), positioning RS (PRS) and channel status information RS (CSI-RS) are defined as DL RSs. The 3GPP LTE / LTE-A standards define physical uplink channels (UL) corresponding to REs that carry information originating from an upper layer, and UL physical signals that are used in the physical layer and correspond to REs that do not carry information originating from from a higher layer. For example, shared physical uplink channel (PUSCH), physical uplink control channel (PUCCH) and physical random access channel (PRACH) are defined as UL physical channels, and a demodulation reference signal (DMRS) for a signal UL data / control data and a probe reference signal (SRS) used for UL channel measurement are defined as UL physical signals.
    [038] In the present description, the PDCCH / PCFICH / PHICH / PDSCH refers to a set of time-frequency resources or a set of REs, which carry downlink control information (DCI) / a control format indicator (CFI) / a negative recognition / recognition (ACK / NACK) DL / DL data. In addition, PUCCH / PUSCH / PRACH refers to a set of time resources - frequency or a set of REs, which carry UL control information (UCI) / UL data / a random access signal. In this description, particularly a time-frequency resource or an ER that is allocated or belongs to the PDCCH / PCFICH / PHICH / PDSCH / PUCCH / PUSCH / PRACH is referred to as a PDCCH RE / PCFICH RE / PHICH RE / PDSCH RE / PUCCH RE / PUSCH RE / PRACH RE or a PDCCH feature / PCFICH feature / PHICH feature / PDSCH feature / PUCCH feature / PUSCH feature / PRACH feature. Down here,
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    8/55 if a UE is said to transmit a PUCCH / PUSCH / PRACH, this means that UCI / UL data / a random access signal is transmitted on or through PUCCH / PUSCH / PRACH. In addition, if a gNB is said to transmit a PDCCH / PCFICH / PHICH / PDSCH, it means that DCI / control information is transmitted on or through the PDCCH / PCFICH / PHICH / PDSCH.
    [039] The following is a frequency division orthogonal multiplexing (OFDM) symbol / carrier / subcarrier for which a CRS / DMRS / CSI-RS / SRS / UE-RS is allocated to or for which the CRS / DMRS / CSI-RS / SRS / UE-RS is configured is referred to as a symbol / carrier / subcarrier / RE CRS / DMRS / CSI-RS / SRS / UE-RS. For example, an OFDM symbol to which a tracking RS (TRS) is allocated or to which TRS is configured is referred to as a TRS symbol, a subcarrier to which a TRS is allocated or to which TRS is configured it is referred to as a TRS subcarrier, and an RE to which a TRS is allocated or to which the TRS is configured is referred to as a TRS RE. In addition, a subframe configured to transmit a TRS is referred to as a TRS subframe. In addition, a subframe carrying a broadcast signal is referred to as a broadcast subframe or a PBCH subframe, and a subframe carrying a synchronization signal (SS) (for example, a primary synchronization signal (PSS) and / or a Secondary synchronization (SSS)) is referred to as an SS subframe or a PSS / SSS subframe. A symbol / subcarrier / RE OFDM to which a PSS / SSS is allocated or to which the PSS / SSS is configured is referred to as a symbol / subcarrier / RE PSS / SSS.
    [040] In the present description, 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 configured to transmit a TRS, respectively. The configured antenna port
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    9/55 to transmit CRSs can be distinguished from each other by the positions of the REs occupied by the CRSs according to the CRS ports, the antenna ports configured to transmit UE-RSs can be distinguished from each other by the positions of the REs occupied by the UE- RSs according to the UE-RS ports, and the antenna ports configured to transmit CSI-RSs can be distinguished from each other by the positions of the REs occupied by the CSI-RSs according to the CSI-RS ports. Therefore, the term CRS / UE-RS / CSI-RS / TRS port is also used to refer to a pattern of REs occupied by a CRS / UE-RS / CSI-RS / TRS in a predetermined resource area.
    [041] Figure 1 illustrates control plane and user plane protocol stacks in a radio interface protocol architecture according to a 3GPP wireless access network standard between a user device (UE) and a access network developed by UMTS terrestrial radio (E-UTRAN). The control plan is a path in which the UE and E-UTRAN transmit control messages to manage calls, and the user plan is a path in which data generated from an application layer, for example, data from voice or Internet packet data, are transmitted.
    [042] A physical layer (PHY) in layer 1 (L1) provides a service for transferring information to its upper layer, a layer of access control to the medium (MAC). The PHY layer is connected to the MAC layer through transport channels. Transport channels deliver data between the MAC layer and the PHY layer. Data is transmitted on physical channels between the PHY layers of a transmitter and a receiver. Physical channels use time and frequency as radio resources. Specifically, the physical channels are modulated in orthogonal frequency division multiple access (OFDMA) for downlink (DL) and single carrier frequency division multiple access (SC-FDMA) for uplink (UL).
    [043] The MAC layer in layer 2 (L2) provides service to your layer
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    Upper 10/55, a radio link control layer (RLC) via logical channels. The L2 RLC layer supports reliable data transmission. The RLC functionality can be implemented in a MAC layer function block. An L2 packet data convergence protocol (PDCP) layer performs header compression to reduce the amount of unnecessary control information and thus efficiently transmit Internet protocol (IP) packets such as IP version 4 (IPv4) packets or IP version 6 (IPv6) via an air interface having a narrow bandwidth.
    [044] A radio resource control layer (RRC) at the bottom of layer 3 (or L3) is defined only in the control plane. The RRC layer controls logical channels, transport channels, and physical channels in relation to the configuration, reconfiguration and release of radio carriers. A radio carrier refers to a service provided in L2, for data transmission between the UE and the E-UTRAN. For this purpose, the RRC layers of the UE and E-UTRAN exchange RRC messages with each other. If an RRC connection is established between the UE and the EUTRAN, the UE is in Connected RRC mode and, conversely, the UE is in RRC Inactive mode. A Non-Access Stratum (NAS) layer above the RRC layer performs functions including session management and mobility management.
    [045] The DL transport channels used to provide E-UTRAN data to the UEs include a broadcast channel (BCH) carrying system information, a paging channel (PCH) carrying a paging message, and a shared channel ( SCH) carrying user traffic or a control message. Multicast traffic or DL control messages or broadcast traffic or DL control messages can be transmitted on a DL SCH or on a separately defined DL multicast channel (MCH). The UL transport channels used to provide data from a UE to the E-UTRAN include an access channel
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    11/55 random (RACH) carrying an initial control message and an UL SCH carrying user traffic or a control message. The logical channels that are defined above the transport channels and mapped to the transport channels include a broadcast control channel (BCCH), a paging control channel (PCCH), a common control channel (CCCH), a channel multicast control (MCCH), a multicast traffic channel (MTCH), etc.
    [046] Figure 2 illustrates the physical channels and a general method for transmitting signals on the physical channels in the 3GPP system.
    [047] With reference to Figure 2, when a UE is turned on or enters a new cell, the UE performs an initial cell search (S201). The initial cell search involves acquiring synchronization with an eNB. Specifically, the UE synchronizes its timing with the eNB and acquires a cell identifier (ID) and other information, receiving a primary synchronization channel (P-SCH) and a secondary synchronization channel (S-SCH) from the eNB . Then, the UE can acquire information transmitted in the cell, receiving a physical broadcast channel (PBCH) from the eNB. During the initial cell search, the UE can monitor a DL channel state, receiving a downlink reference signal (DL RS).
    [048] After the initial cell search, the UE can acquire detailed system information, receiving a physical downlink control channel (PDCCH) and receiving a shared physical downlink channel (PDSCH) based on the information included in the PDCCH (S202 ).
    [049] If the UE initially accesses the eNB or does not have radio resources for signal transmission to the eNB, the UE may perform a random access procedure with the eNB (S203 to S206). In the random access procedure, the UE can transmit a predetermined sequence as a preamble on a physical random access channel (PRACH) (S203 and S205) and can receive a preamble response message on a PDCCH and a PDSCH associated with the PDCCH ( S204 and S206). At the
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    12/55 case of a contention-based RACH, the UE may additionally perform a containment resolution procedure.
    [050] After the above procedure, the UE can receive a PDCCH and / or a PDSCH from the eNB (S207) and transmit a shared physical uplink channel (PUSCH) and / or a physical uplink control channel (PUCCH) for eNB (S208), which is a general DL and UL signal transmission procedure. In particular, the UE receives downlink control information (DCI) on a PDCCH. Here, the DCI includes control information, such as resource allocation information for the UE. Different DCI formats are defined according to different uses of DCI.
    [051] The control information that the UE transmits to the eNB on the UL or receives from the eNB on the DL includes a negative recognition / recognition signal (ACK / NACK) DL / UL, a channel quality indicator (CQI) , a pre-coding matrix index (PMI), a classification indicator (RI), etc. In the 3GPP LTE system, the UE can transmit control information, such as a CQI, a PMI, an RI, etc., in a PUSCH and / or in a PUCCH.
    [052] Figure 3 is a diagram illustrating a radio frame structure for transmitting a synchronization signal (SS) in the LTE system. In particular, Figure 3 illustrates a radio frame structure for transmitting a frequency division duplex (FDD) synchronization and PBCH signal. Figure 3 (a) shows positions in which the SS and PBCH are transmitted in a radio frame configured by a normal cyclic prefix (CP) and Figure 3 (b) shows positions in which the SS and PBCH are transmitted in a radio frame configured by an extended PLC.
    [053] An SS will be described in more detail with reference to Figure 3. An SS is categorized into a primary sync signal (PSS) and a secondary sync signal (SSS). The PSS is used to acquire time domain synchronization, such as OFDM symbol synchronization, interval synchronization, etc. and / or synchronization in the frequency domain. SSS is used to
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    13/55 acquire frame synchronization, a cell group ID and / or a cell's CP configuration (ie information indicating whether a normal or extended CP is used). With respect to Figure 3, a PSS and an SSS are transmitted via two OFDM symbols on each radio frame. In particular, the SS is transmitted in the first time interval in each subframe 0 and subframe 5 considering a GSM (Global System for Mobile Communication) frame length of 4.6 ms to facilitate the measurement of inter-radio access technology ( inter-RAT). In particular, the PSS is transmitted in one last OFDM symbol in each of the first interval of subframe 0 and in the first interval of subframe 5. The SSS is transmitted in one second to the last OFDM symbol in each of the first interval of subframe 0 and the first subframe interval 5. The limits of a corresponding radio frame can be detected via the SSS. The PSS is transmitted on the last OFDM symbol of the corresponding interval and the SSS is transmitted on the OFDM symbol immediately before the OFDM symbol on which the PSS is transmitted. According to a transmission diversity scheme for the SS, only a single antenna port is used. However, the transmission diversity scheme for SS standards is not defined separately in the current standard.
    [054] Upon detecting the PSS, a UE can know that a corresponding subframe is one of subframe 0 and subframe 5 since the PSS is transmitted every 5 ms, but the UE cannot know whether the subframe is subframe 0 or subframe 5. In other words, frame synchronization cannot be obtained only from the PSS. The UE detects the limits of the radio frame in order to detect an SSS that is transmitted twice in a radio frame with different sequences.
    [055] Having demodulated a DL signal by performing a cell search procedure using the PSS / SSS and the determined time and frequency parameters necessary to carry out the transmission of the UL signal in a precise time, a UE can communicate with an eNB only after obtaining system information
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    14/55 required for a UE system configuration from eNB.
    [056] The system information is configured with a master information block (MIB) and system information blocks (SIBs). Each SIB includes a set of functionally related parameters and is categorized into a MIB, SIB Type 1 (SIB1), SIB Type 2 (SIB2) and SIB3 to SIB8 according to the included parameters.
    [057] The MIB includes parameters transmitted more frequently, which are essential for an UE to initially access a network served by an eNB. The UE can receive the MIB through a broadcast channel (for example, a PBCH). The MIB includes a downlink system bandwidth (DL BW), a PHICH configuration, and a system frame number (SFN). Thus, the UE can explicitly know information about the configuration of DL BW, SFN and PHICH receiving the PBCH. On the other hand, the UE can implicitly know information about the number of eNB transmission antenna ports. Information about the number of eNB transmit antennas is implicitly signaled by masking (for example, XOR operation) a sequence corresponding to the number of transmit antennas for 16-bit cyclic redundancy check (CRC) used to detect an error in the PBCH.
    [058] SIB1 includes not only information on time domain scaling for other SIBs, but also parameters needed to determine whether a specific cell is suitable for cell selection. The UE receives SIB1 via broadcast signaling or dedicated signaling.
    [059] A DL carrier frequency and corresponding system bandwidth can be obtained by the MIB loaded by the PBCH. A UL carrier frequency and corresponding system bandwidth can be obtained from the system information corresponding to a DL signal. Having received the MIB, if there is no valid system information stored in a corresponding cell, a UE applies a value from a DL BW included in the MIB to
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    15/55 a UL bandwidth until type 2 system information block (SystemlnformationBlockType2, SIB2) is received. For example, if the UE obtains the SIB2, the UE is able to identify the entire bandwidth of the UL system capable of being used for UL transmission through UL carrier frequency and UL bandwidth information included in the SIB2.
    [060] In the frequency domain, the PSS / SSS and PBCH are transmitted independently of an actual system bandwidth totaling 6 RBs, that is, 3 RBs on the left side and 3 RBs on the right side with reference to a DC subcarrier inside a corresponding OFDM symbol. In other words, PSS / SSS and PBCH are transmitted only on 72 subcarriers. Therefore, a UE is configured to detect or decode the SS and PBCH, regardless of a downlink transmission bandwidth configured for the UE.
    [061] Having completed the initial cell search, the UE can perform a random access procedure to complete access to the eNB. For this purpose, the UE transmits a preamble via PRACH (physical random access channel) and can receive a reply message via PDCCH and PDSCH in response to the preamble. In the case of contention-based random access, it can transmit additional PRACH and perform a contention resolution procedure, such as PDCCH and PDSCH, corresponding to the PDCCH.
    [062] Having performed the procedure mentioned above, the UE can perform PDCCH / PDSCH reception and PUSCH / PUCCH transmission as a general UL / DL signal transmission procedure.
    [063] The random access procedure is also called a random access channel (RACH) procedure. The random access procedure is used for a number of uses, including initial access, UL synchronization adjustment, resource allocation, automatic pattern change between cells, and the like.
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    16/55
    The random access procedure is categorized into a contention-based procedure and a dedicated procedure (that is, not based on contention). In general, the contention-based random access procedure is used to perform the initial access. On the other hand, the dedicated random access procedure is used strictly to perform automatic pattern changes between cells and the like. When the contention-based random access procedure is performed, a UE randomly selects a preamble sequence from the RACH. Thus, a plurality of UEs can transmit the same RACH preamble sequence at the same time. As a result, a containment resolution procedure is necessary from then on. Conversely, when the dedicated random access procedure is performed, the UE uses a dedicated RACH preamble sequence allocated to the UE by an eNB. Thus, the UE can perform the random access procedure without colliding with a different UE.
    [064] The contention-based random access procedure includes 4 steps described below. The messages transmitted through the 4 steps can be called message (Msg) 1 to 4 respectively in the present description.
    [065] - Step 1: preamble to RACH (via PRACH) (EU for eNB) [066] - Step 2: Random access response (RAR) (via PDCCH and PDSCH (eNB for EU) [067] - Step 3 : Layer 2 / Layer 3 message (via PUSCH) (EU to eNB) [068] - Step 4: Containment resolution message (eNB to EU) [069] On the other hand, the dedicated random access procedure includes 3 steps The messages transmitted through the 3 steps can be called message (Msg) 0 to 2 in this description respectively. You can also perform uplink transmission (ie step 3) corresponding to PAR as a part of the access procedure. The random access procedure
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    17/55 dedicated random can be triggered using the PDCCH (then PDCCH order) which is used for an eNB to indicate the transmission of a RACH preamble.
    [070] - Step 0: Assignment of RACH Preamble via dedicated signaling (eNB for EU) [071] - Step 1: Preamble of RACH (via PRACH) (EU for eNB) [072] - Step 2: Access response random (RAR) (via PDCCH and PDSCH) (eNB for UE) [073] After the RACH preamble is transmitted, the UE tries to receive a random access response (RAR) in a pre-configured time window. Specifically, the UE attempts to detect PDCCH (then RA-RNTI PDCCH) (for example, a masked CRC with RA-RNTI in PDCCH) having RA-RNTI (random access RNTI) in a time window. If the RA-RNTI PDCCH is detected, the UE checks whether or not there is a RAR for the UE in PDSCH corresponding to the RARNTI PDCCH. The RAR includes timing advance information (TA) indicating timing shift information for UL synchronization, UL resource allocation information (UL grant information), a temporary UE identifier (for example, temporary cell RNTI, TC- RNTI) and the like. The UE can perform UL transmission (for example, message 3) according to the resource allocation information and the TA value included in the RAR. HARQ is applied to the UL transmission corresponding to the RAR. In particular, the UE may receive reception response information (e.g., PHICH) corresponding to message 3 after transmission of message 3.
    [074] A random access preamble (ie, the RACH preamble) consists of a cyclic prefix of a length of TCP and a portion of the sequence of a length of TSEQ. TCP and TSEQ depend on a frame structure and a random access configuration. A preamble format is
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    18/55 controlled by the top layer. The preamble to RACH is transmitted in a UL subframe. The transmission of the random access preamble is restricted to a specific time resource and a frequency resource. The resources are called PRACH resources. To match an index 0 with a PRB and a subframe of a smaller number in a radio frame, PRACH resources are numbered in an ascending order of PRBs in subframe numbers in the radio frame and frequency domain. The random access features are defined according to a PRACH configuration index (see standard document 3GPP TS 36.211). The RACH configuration index is provided by an upper layer signal (transmitted by an eNB).
    [075] In the LTE / LTE-A system, a spacing between subcarriers for a random access preamble (ie, the RACH preamble) is regulated by 1.25 kHz and 7.5 kHz for preamble formats 0 to 3 and one preamble format 4, respectively (refer to 3GPP TS 36.211).
    <OFDM Numerology>
    [076] A New RAT system adopts an OFDM transmission scheme or a transmission scheme similar to the OFDM transmission scheme. The New RAT system can use OFDM parameters different from the LTE OFDM parameters. Or the New RAT system may follow legacy LTE / LTE-A numerology, but may have a higher system bandwidth (for example, 100 MHz). Or a cell can support a plurality of numerologies. That is, UEs operating with different numerologies can coexist within a cell.
    <Subframe Structure>
    [077] In the 3GPP LTE / LTE-A system, a radio frame is 10 ms (307200T s ) long, including 10 equally sized subframes (SFs). The 10 SFs of a radio frame can be assigned numbers. T s represents a sampling time and is expressed as T s = 1 / (2048 * 15 kHz). Each SF is 1 ms, including
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    19/55 two intervals. The 20 intervals of a radio frame can be numbered sequentially from 0 to 19. Each interval is 0.5 ms long. A time taken to transmit an SF is defined as a transmission time interval (TTI). A time resource can be distinguished by a radio frame number (or radio frame index), an SF number (or SF index), an interval number (or interval index), and so on. A TTI refers to an interval over which data can be scaled. In the current LTE / LTE-A system, for example, there is an opportunity to transmit UL grant or DL grant every 1 ms, without a plurality of UL / DL grant opportunities for less than 1 ms. Thus, a TTI is 1 ms in the legacy LTE / LTE-A system.
    [078] Figure 4 illustrates an example range structure available in the new radio access technology (NR).
    [079] To minimize a data transmission delay, a timing structure in which a control channel and a data channel are multiplexed on multiplexing by time division (TDM) is considered in the NR 5 Generation (5G).
    [080] In Figure 4, an area marked with slanted lines represents a transmission region of a DL control channel (for example, PDCCH) carrying DCI, and a black part represents a transmission region of an UL control channel. (e.g., PUCCH) loading UCI. DCI is the control information that a gNB transmits to a UE, and may include information about a cell configuration that a UE must know, specific DL information such as DL scheduling, and specific UL information such as a UL grant. In addition, the UCI is a control information that a UE transmits to a gNB. The UCI can include a HARQ ACK / NACK report for DL data, a CSI report for a DL channel state, an escalation request (SR), and so on.
    [081] In Figure 4, the symbols with the symbol index 1 to the symbol index
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    20/55 can be used for transmission of a physical channel (for example, PDSCH) that carries DL data, and also for transmission of a physical channel (for example, PUSCH) carrying UL data. According to the interval structure illustrated in Figure 2, as DL transmission and UL transmission occur sequentially in an interval, transmission / reception of DL data and reception / transmission of an ACK / NACK UL for DL data can be performed in an interval . As a consequence, when an error is generated during data transmission, the time taken for a data retransmission can be reduced, thereby minimizing the delay for a final data transmission.
    [082] In this interval structure, a time frame is required to allow a gNB and UE to switch from a transmission mode to a reception mode or from the reception mode to the transmission mode. For switching between the transmit mode and the receive mode, an OFDM symbol corresponding to a switching time DL to UL is configured as a guard period (GP) in the interval structure.
    [083] In the legacy LTE / LTE-A system, a DL control channel is multiplexed with a TDM data channel, and a control channel, PDCCH, is transmitted distributed over a full system band. In NR, however, it is expected that the bandwidth of a system will be at least approximately 100 MHz, which makes it impossible to transmit a control channel over a full band. If a UE monitors the full bandwidth to receive a DL control channel, for data transmission / reception, this can increase the UE's battery consumption and decrease efficiency. Accordingly, a DL control channel can be transmitted located or distributed over some frequency band within a system band, that is, a channel band in the present description.
    [084] In the NR system, a basic transmission unit is an interval. An interval duration includes 14 symbols, each with a normal cyclic prefix (CP),
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    21/55 or 12 symbols each with an extended CP. In addition, an interval is scaled over time by a function of a subcarrier spacing used. That is, as the spacing between subcarriers increases, the length of an interval decreases. For example, given 14 symbols per interval, if the number of intervals in a 10 ms frame is 10 for a 15 kHz subcarrier spacing, the number of intervals is 20 for a 30 kHz subcarrier spacing and 40 for a spacing between subcarriers between 60 kHz subcarriers. As the spacing between subcarriers increases, the length of an OFDM symbol decreases. The number of OFDM symbols per interval is different depending on the normal or extended CP, and is not changed according to the spacing between subcarriers. The basic time unit for LTE, T s , is defined as 1 / (15000 * 2048) seconds, considering the basic subcarrier spacing of 15 kHz and a maximum FFT size of 2048. T s is also a sampling time for the spacing between 15 kHz subcarriers. In the NR system, many other subcarrier spacing beyond 15kHz is available, and as a spacing between subcarriers is inversely proportional to a corresponding length of time, an actual sampling time T s corresponding to subcarrier spacing greater than 15 kHz becomes smaller than 1 / (15000 * 2048) seconds. For example, the actual sampling time for the 30 kHz, 60 kHz and 120 kHz subcarrier spacing can be 1 / (2 * 15000 * 2048) seconds, 1 / (4 * 15000 * 2048) seconds and 1 / (8 * 15000 * 2048) seconds, respectively.
    <Analog Beam Formation>
    [085] For a 5G mobile communication system under discussion, a technique for using an ultra-high frequency band, that is, a millimeter frequency range of 6 GHz or above, is considered to transmit data to a plurality of users high transmission rate over a wide range of
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    22/55 frequency. 3GPP calls this technique NR, so a 5G mobile communication system will be called an NR system in this description. However, the millimeter frequency band has the frequency property that a signal is attenuated very quickly according to the distance due to the use of a very high frequency band. Consequently, the NR system using a frequency range equal to or greater than at least 6 GHz employs a narrow beam transmission scheme in which a signal is transmitted with energy concentrated in a specific direction, not omnidirectionally, in order to compensate for the rapid attenuation of propagation and thus overcome the decrease in coverage caused by the rapid attenuation of propagation. However, if a service is provided using only a narrow beam, the service coverage of a gNB becomes narrow, and thus gNB provides service over a broadband, collecting a plurality of narrow beams.
    [086] As a wavelength becomes short in the millimeter frequency band, that is, the millimeter wave (mmW), it is possible to install a plurality of antenna elements in the same area. For example, a total of 100 antenna elements can be installed at 0.5 lamda intervals (wavelength) in a 30 GHz band with a wavelength of approximately 1 cm in a two-dimensional (2D) array on a panel 5 by 5 cm. Therefore, it is considered to increase coverage or throughput by increasing a beam formation gain through the use of a plurality of mmW antenna elements.
    [087] To form a narrow beam in the millimeter frequency band, a beam formation scheme is mainly considered, in which a gNB or UE transmits the same signals with appropriate phase differences across multiple antennas, thus increasing energy only in a specific direction. Such beam formation schemes include digital beam formation to generate a phase difference between digital baseband signals, analog beam formation for
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    23/55 generate a phase difference between modulated analog signals using a time delay (ie, a cyclic shift), and hybrid beam formation using digital beam formation and analog beam formation. If a TXRU is provided per antenna element to allow control of the transmission power and one phase per antenna, it is possible to carry out an independent beam formation by frequency resource. However, installing TXRUs for all approximately 100 antenna elements is not cost effective. That is, to compensate for the rapid attenuation of propagation in the millimeter frequency range, multiple antennas must be used and the digital beam formation requires so many RF components (for example, digital-to-analog converters (DACs), mixers, power amplifiers and linear amplifiers) and antennas. Therefore, the implementation of digital beam formation in the millimeter frequency band faces the problem of increasing the cost of communication devices. Therefore, in the case where a large number of antennas are required, as in the millimeter frequency band, analog beam formation or hybrid beam formation is considered. In analog beam formation, a plurality of antenna elements are mapped to a TXRU, and the direction of a beam is controlled by an analog phase shifter. A disadvantage with this analog beam formation scheme is that frequency selective beam formation (BF) cannot be provided because only one beam direction can be produced in a total band. The hybrid BF is between the digital BF and the analog BF, in which less TXRUs B are used than the antenna elements Q. In hybrid BF, the directions of the transmissible beams at the same time are limited to or below B, although the number of beam directions is different according to the connections between the B TXRUs and Q antenna elements.
    [088] Figure 5 is a view that illustrates exemplary connection schemes between TXRUs and antenna elements.
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    24/55 [089] Figure 5 (a) illustrates the connection between a TXRU and a subarray. In this case, an antenna element is connected only to a TXRU. In contrast, Figure 5 (b) illustrates the connection between a TXRU and all antenna elements. In this case, an antenna element is connected to all TXRUs. In Figure 5, W represents a phase vector submitted to multiplication in an analog phase shifter. That is, an analog beamforming direction is determined by W. Here, the CSI-RS antenna ports can be mapped to TXRUs in one to one or one to many correspondence.
    [090] As mentioned earlier, once a digital baseband signal to be transmitted or a received digital baseband signal is subjected to a digital beam forming signal process, a signal can be transmitted or received on or at from a plurality of directions in multiple beams. In contrast, in analog beam formation, an analog signal to be transmitted or an analog signal received is subjected to beam formation in a modulated state. Thus, signals cannot be transmitted or received simultaneously in or from a plurality of directions beyond the coverage of a beam. A gNB generally communicates with several users at the same time, relying on broadband transmission or the ownership of multiple antennas. If gNB uses analog BF or hybrid BF and forms an analog beam in the direction of a beam, gNB has no other way than to communicate only with users covered in the same direction as the analog beam in view of the nature of analog BF. An allocation of RACH resources and a scheme of utilization of gNB resources described later, in accordance with the present description, are proposed reflecting limitations caused by the nature of analog BF or hybrid BF.
    <Hybrid analog beam formation>
    [091] Figure 6 illustrates abstractly a hybrid beam-forming structure in terms of TXRUs and physical antennas.
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    25/55 [092] For the case where multiple antennas are used, hybrid BF with digital BF and analog BF in combination has emerged. Analog BF (or RF BF) is a pre-coding (or combination) operation on an RF unit. Due to the pre-coding (combination) in each base band unit and RF unit, the hybrid BF offers the performance benefit close to the performance of the digital BF, reducing the number of RF chains and the number of DACs (or analog converters) - digital). For convenience, a hybrid BF structure can be represented by N TXRUs and M physical antennas. The digital BF for L data layers to be transmitted by a transmission end can be represented as an N by N matrix, and then N converted digital signals are converted into analog signals via TXRUs and submitted to the analog BF represented as an M matrix by N. In Figure 6, the number of digital beams is L, and the number of analog beams is N. In addition, it is considered in the NR system that a gNB is configured to change the analog BF based on symbols, so to more efficiently support BF for a UE located in a specific area. In addition, when an antenna panel is defined by N TXRUs and M RF antennas, the introduction of a plurality of antenna panels to which the independent hybrid BF is applicable is also considered. As such, in the case where a gNB uses a plurality of analog beams, a different analog beam may be preferred for signal reception in each UE. Therefore, a beam scan operation is being considered, in which at least one SS, system and paging information, a gNB alters a plurality of analog beams based on symbols in a specific range or SF to allow all UEs to have reception opportunities.
    [093] Figure 7 is a view that illustrates the beam scan for an SS and system information during DL transmission. In Figure 7, physical resources or a physical channel that transmits system information from the New RAT system is referred to as an xPBCH. Analog beams from different antenna panels can be
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    26/55 transmitted simultaneously in a symbol, and the introduction of a beam reference signal (BRS) transmitted to a single analog beam corresponding to a specific antenna panel, as illustrated in Figure 7, is under discussion to measure a channel by analog beam. BRSs can be defined for a plurality of antenna ports, and each antenna port of the BRSs can correspond to a single analog beam. Unlike BRSs, the SS or xPBCH can be transmitted for all analog beams included in a group of analog beams, so that any UE can receive the SS or xPBCH successfully.
    [094] Figure 8 is a view that illustrates an example cell in the NR system.
    [095] With reference to Figure 8, in comparison with a wireless communication system, such as legacy LTE in which an eNB forms a cell, the configuration of a cell by a plurality of TRPs is under discussion in the NR system. If a plurality of TRPs form a cell, even if a TRP serving a UE is changed, continuous communication is advantageously possible, thus facilitating mobility management for UEs.
    [096] Compared to the LTE / LTE-A system where a PSS / SSS is transmitted in an omnidirectional way, a method for transmitting a signal like a PSS / SSS / PBCH via BF performed by sequentially changing a beam direction for all directions in a gNB applying millimeter wave is considered. The transmission / reception of the signal performed when changing the direction of the beam is called beam scanning or beam scanning. In the present description, “beam scanning” is a behavior on the transmitting side, and “beam scanning” is a behavior on the receiving side. For example, if up to N beam directions are available for gNB, gNB transmits a signal such as a PSS / SSS / PBCH in N beam directions. That is, gNB transmits an SS such as PSS / SSS / PBCH in each direction by sweeping a beam in directions available to or
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    27/55 supported by gNB. Or, if the gNB is capable of forming N beams, the beams can be grouped, and the PSS / SSS / PBCH can be transmitted / received on a group basis. A bundle group includes one or more bundles. Signals such as PSS / SSS / PBCH transmitted in the same direction can be defined as an SS block (SSB), and a plurality of SSBs can exist in a cell. If there are a plurality of SSBs, an SSB index can be used to identify each SSB. 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 form an SSB, and it can be understood that 10 SSBs exist in the system. In the present description, a beam index can be interpreted as an SSB index.
    [097] Prior to the description of the present description, the positions in which the SSBs are arranged, which are described in the present description, mean positions of the resource regions in which the SSBs can be transmitted and, therefore, can be called candidate SSBs as resource regions where SSBs can be transmitted.
    [098] That is, although the positions of candidate SSBs or resource regions in which SSBs can be transmitted are defined in this description, SSBs are not necessarily transmitted in defined positions of candidate SSBs. In other words, although SSBs can be transmitted in defined positions of candidate SSBs, there may be positions of candidate SSBs in which SSBs are not transmitted in some cases. Consequently, in addition to defining candidate SSB positions, the present description further describes a method of indicating information about a actually transmitted sync signal block (ATSS).
    [099] Furthermore, an SS burst proposed in the present description is a set of candidate SSB positions and represents a set or arrangement of candidate SSBs in a specific length of time or unit of time
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    28/55 specific. The SS burst can have different specific time durations or specific time units according to the spacing between subcarriers. For example, when the number of OFDM symbols included in a symbol is 14, an SS burst having a 15 kHz or 30 kHz subcarrier spacing used in bands of 6 GHz or less may refer to a set or arrangement of included candidate SSBs in an interval and an SS burst with a 120 kHz or 240 kHz subcarrier spacing used in bands of 6 GHz or higher may refer to a set or arrangement of candidate SSBs included within 0.25 ms.
    [0100] In addition, an SS burst is a group of SS bursts and can refer to a set or arrangement of SS bursts in a unit time of 5 ms.
    <SS burst set configuration>
    [0101] The following description describes a method of configuring a set of SS bursts according to the subcarrier spacing (SCS) of a synchronization signal block (SSB) in a system that supports New RAT (NR).
    [0102] In NR, all SSBs are positioned within a 5 ms window, regardless of the periodicity of a set of SS bursts. In addition, the number of SSBs that need to be positioned within 5 ms is defined differently, depending on the frequency range.
    [0103] For example, a maximum of 4 SSBs are arranged within the 5 ms window in bands of 3 GHz or less and a maximum of 8 SSBs are arranged within the 5 ms window in bands from 3 GHz to 6 GHz. In addition, a maximum of 64 SSBs can be arranged within the 5 ms window in bands of 6 GHz or higher. In addition, as the spacing between subcarriers for SSBs, 15 kHz or 30 kHz can be used in bands of 6 GHz or less and 120 kHz or 240 kHz can be used in bands of 6 GHz or higher. However, it is assumed that only the spacing between 15 kHz subcarriers is used in 3 GHz bands or
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    29/55 lower in this description.
    [0104] To satisfy the conditions described above, a set of SS bursts needs to be configured in such a way that a maximum of 4 or 8 SSBs are arranged within 5 ms in a 15 kHz subcarrier spacing and must be configured in such a way that a maximum of 8 SSBs are arranged within 5 ms in a spacing between subcarriers of 30 kHz. In addition, a set of SS bursts needs to be configured so that a maximum of 64 SSBs are arranged in 120 kHz and 240 kHz subcarrier spacing.
    [0105] As shown in Table 1, there are several minimum times required to arrange a maximum number of SSBs from 2 ms to 4 ms for each spacing between subcarriers. Consequently, it is necessary to configure several sets of SS bursts within the 5 ms window.
    [0106] Therefore, this description describes how to arrange SSBs within the 5 ms window according to the subcarrier spacing.
    [Table 1]
    Spacing between subcarriers The maximum number of SS block llllllll llllllll llllllll lllllllll llllllll llllllll 15 kHz 1 ms 1 ms 2 ms 4 ms - - 30 kHz - 0.5ms 1 ms 2 ms - - 120 kHz - - - - 2 ms 4 ms 240 kHz - - - - 1 ms 2 ms
    [0107] 1. SS burst set configuration in bands of 3 GHz or less [0108] It is assumed that only the spacing between subcarriers of 15 kHz is used as spacing between subcarriers for SSBs in bands of 3 GHz or less in the present description. A maximum of 4 SSBs can be included in a 5 ms window in bands of 3 GHz or less. A maximum of 2 SSBs can be arranged within 1 ms in the case of 15 kHz subcarrier spacing and,
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    Therefore, a minimum of 2 ms is required to include a maximum of 4 SSBs. In addition, a set of SS bursts can be configured in bands of 3 GHz or less based on the description above, as shown in Figure 9.
    Mode 1-1 [0109] As shown in Figure 9 (a), a set of SS bursts configured so that 4 SSBs are arranged within 2 ms can be considered. When the burst burst SS is configured as shown in Figure 9 (a), an UE in an inactive state can use only 2 ms for SSB decoding and thus is advantageous from the point of view of energy consumption. If 4 or less SSBs are used within a 5 ms window, the transmitted SSBs can actually be signaled to a UE using a bitmap. However, the UE can assume that SSBs are transmitted by being arranged from the front of candidate SSB transmission positions for transmission of SSB if there is no bitmap information.
    Mode 1-2 [0110] In mode 1 -2, 2 SSBs are defined as a single SS burst unit and SS burst units are arranged at a predetermined interval of 1 ms or more, as shown in Figure 9 (b). That is, since 2 SSBs constitute a single SS burst, a single SS burst becomes a single SS burst unit in 1-2 mode. When a set of SS bursts is configured in this way, the durations in which the SSBs are not arranged can be used for uplink transmission and, therefore, low latency communication using the same can be performed. If 4 SSBs or less are used within the 5 ms window, the SSBs actually transmitted can be signaled to a UE using a bitmap. However, the UE can assume that SSBs are transmitted by being arranged from the front of transmission positions of candidate SSBs for SSB transmission or SS burst units are alternately arranged if not
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    31/55 there is bitmap information. For example, when 2 SSBs are arranged, one SSB can be arranged on the first SS burst unit and the remaining SSBs can be arranged on the second SS burst unit.
    [0111] 2. SS burst set configuration in bands from 3 GHz to 6 GHz [0112] 15 kHz and 30 kHz are used as spacer spacing for SSBs in bands from 3 GHz to 6 GHz. A maximum of 8 SSBs can be arranged within a window 5 ms in the corresponding bands. Specifically, a maximum of 2 SSBs can be arranged in 1 ms in the spacing between 15 kHz subcarriers and a maximum of 2 SSBs can be arranged in 0.5 ms in the spacing between 30 kHz subcarriers. Therefore, a minimum of 4 ms is required to arrange 8 SSBs in the spacing between 15 kHz subcarriers and a minimum of 2 ms is required to arrange 8 SSBs in the spacing between 30 kHz subcarriers. Based on this, modalities for configuring the SS burst set in bands from 3 GHz to 6 GHz are described with reference to Figures 10 and 11.
    [0113] (1) When the spacing between SSB subcarriers is 15 kHz
    Mode 2-1 [0114] As shown in Figure 10 (a), an SS burst set can be configured in such a way that all 4 SSBs are arranged in 4 ms. When an SS burst set is configured as shown in Figure 10 (a), an UE in an inactive state can use only 4 ms for decoding SSB and thus is advantageous from the point of view of energy consumption. If 8 SSBs or less are used in a 5 ms window, the SSBs actually transmitted can be signaled to a UE using a bitmap. However, the UE can assume that SSBs are transmitted by being arranged at the front of transmission positions of candidate SSBs for transmission of SSB if there is no bitmap information.
    Mode 2-2
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    32/55 [0115] In 2-2 mode, 4 SSBs are defined as a single SS burst unit and SS burst units are arranged at a predetermined interval of 1 ms or more, as shown in Figure 10 (b). That is, since 2 SSBs constitute a single SS burst, 2 SS bursts are defined as a single SS burst unit in 2-2 mode. When an SS burst set is configured in this way, the durations over which the SSBs are not arranged can be used for uplink transmission and, therefore, low latency communication using it can be performed.
    [0116] If 8 SSBs or less are used within a 5 ms window, the SSBs actually transmitted can be signaled to a UE using a bitmap. However, the UE can assume that SSBs are transmitted by being arranged from the front of transmission positions of candidate SSBs for SSB transmission or SS burst units are alternately arranged if there is no bitmap information. For example, when 3 SSBs are arranged, one SSB can be arranged on the first SS burst unit, another SSB can be arranged on the second SS burst unit and the remaining SSB can be arranged on the first SS burst unit.
    [0117] (2) When the spacing between SSB subcarriers is 30 kHz
    Mode 2-3 [0118] As shown in Figure 11 (a), an SS burst set can be configured so that all 8 SSBs are arranged in 2 ms. When an SS burst set is configured as shown in Figure 11 (a), an UE in an inactive state can use only 2 ms for SSB decoding and thus is advantageous from the point of view of energy consumption. If 8 SSBs or less are used in a 5 ms window, the SSBs actually transmitted can be signaled to a UE using a bitmap. However, the UE can assume that SSBs are transmitted by being arranged from the front of transmission positions
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    33/55 candidate SSBs for SSB transmission if there is no bitmap information.
    Modes 2-4 [0119] In mode 2-4, N SSBs are defined as a single SS burst unit and SS burst units are arranged at a predetermined interval of 0.5 ms or more, as shown in Figure 11 ( B). When an SS burst set is configured in this way, the durations over which the SSBs are not arranged can be used for uplink transmission and, therefore, low latency communication using it can be performed.
    [0120] If 8 SSBs or less are used within a 5 ms window, the SSBs actually transmitted can be signaled to a UE using a bitmap. However, the UE can assume that SSBs are transmitted by being arranged from the front of transmission positions of candidate SSBs for SSB transmission or SS burst units are alternately arranged if there is no bitmap information. For example, when 3 SSBs are arranged, one SSB can be arranged on the first SS burst unit, another SSB can be arranged on the second SS burst unit and the remaining SSB can be arranged on the third SS burst unit.
    [0121] 3. Configuring the SS burst set in bands of 6 GHz or higher [0122] 120 kHz and 240 kHz are used as spacing between subcarriers for SSBs in bands of 6 GHz or more. A maximum of 64 SSBs can be arranged within a 5 ms window on the corresponding bands. A maximum of 2 SSBs can be arranged in 0.125 ms in the spacing between 120 kHz subcarriers and a maximum of 4 SSBs can be arranged in 0.125 ms in the spacing between 240 kHz subcarriers. Therefore, a minimum of 4 ms is required to arrange 64 SSBs in the spacing between 120 kHz subcarriers and it is necessary
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    34/55 a minimum of 2 ms to arrange 64 SSBs in the 240 kHz subcarrier spacing. Based on this, modalities for configuring sets of SS bursts in bands of 6 GHz or higher are described with reference to Figures 12 to 15. Additionally, in modalities 3-1 to 3-3, it is assumed that a single burst unit SSB is configured in units of 8 SSBs considering the smooth operation of URLLC (Ultra Reliable Low Latency Communications) and overload of a bitmap indicating information about ATSSs for UEs.
    Mode 3-1 [0123] As shown in Figure 12, an SS burst set can be configured so that all 64 SSBs are consecutive. Here, Figure 12 (a) shows an SS burst set configuration in the case of a 120 kHz subcarrier spacing and Figure 12 (b) shows an SS burst set configuration in the case of a 240 subarray spacing kHz.
    [0124] When a set of SS bursts is configured as shown in Figure 12, a UE in an inactive state can use only 4 ms for SSB decoding in the case of 120 kHz and uses 2 ms for SSB decoding in the case of 240 kHz and so it is advantageous from the point of view of energy consumption. If 64 SSBs or less are used in a 5 ms window, the SS burst units actually transmitted can be signaled to a UE using a bitmap. In addition, the UE can learn information about the number of SSBs used per SS burst unit by performing blind detection or using other methods. However, the UE can assume that SSBs are transmitted by being arranged from the front of transmission positions of candidate SSBs for transmission of SSB if there is no bitmap information.
    Mode 3-2 [0125] In mode 3-2, the N SSBs are defined as a single SS burst unit and the SS burst units are arranged in an interval
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    35/55 predetermined 0.125 ms or more, as shown in Figure 13. Figure 13 (a) shows an SS burst set configuration in the case of a 120 kHz subcarrier spacing and Figure 13 (b) shows a configuration of the SS burst set in the case of a 240 kHz subcarrier spacing.
    [0126] When an SS burst set is configured in this way, the durations in which the SSBs are not arranged can be used for uplink transmission and, therefore, low latency communication using the same can be performed.
    [0127] If 64 SSBs or less are used within a 5 ms window, the SS burst units actually transmitted can be signaled to a UE using a bitmap. In addition, the UE can learn information about the number of SSBs used per SS burst unit by performing blind detection or using other methods.
    [0128] However, the UE can assume that SSBs are transmitted by being arranged from the front of transmission positions of candidate SSBs for SSB transmission or SS burst units are alternately arranged if there is no bitmap information. For example, when 3 SSBs are arranged, one SSB can be arranged on the first SS burst unit, another SSB can be arranged on the second SS burst unit and the remaining SSB can be arranged on the third SS burst unit.
    Mode 3-3 [0129] In NR, SSBs and data can be multiplexed and transmitted even when a spacing between SSB subcarriers differs from a spacing between data subcarriers. That is, a 60 kHz and 120 kHz one can be selected as the spacing between data subcarriers, a 120 kHz and 240 kHz one can be selected as the spacing between SSBs subcarriers and the data and SSBs can be multiplexed.
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    36/55 [0130] If the spacing between data subcarriers is 60 kHz and the spacing between SSB subcarriers is 120 kHz, when an SS burst set is configured as in 3-2 mode, SSBs are arranged from the middle of an interval having a spacing between subcarriers of 60 kHz, as shown in Figure 14 (a).
    [0131] However, when the SS burst set is configured as shown in Figure 14 (a), the control regions of the front and rear of the groove having a 60 kHz subcarrier spacing may not be guaranteed because the symbols for downlink control and symbols for uplink control need to be allocated to the front and back of an NR range. Consequently, SS bursts can be reconfigured as shown in Figure 14 (b) only in cases where SS bursts are configured so that data control regions cannot be guaranteed.
    [0132] Alternatively, an SS burst set configuration can be designed according to an interval duration of 60 kHz. As shown in Figure 15, it is possible to design an SS burst set configuration so that SSBs are arranged from the front of an interval having a 60 kHz subcarrier spacing allocating a predetermined duration over which no SSB is arranged for. uplink communication, similar to mode 3-2 Here, Figure 15 (a) shows a mode in which the spacing between SSB subcarriers is 120 kHz and the spacing between data subcarriers is 60 kHz and Figure 15 (b) shows a modality in which the spacing between SSB subcarriers is 240 kHz and the spacing between data subcarriers is 60 kHz.
    [0133] In addition, the addition of a cell ID compensation to the SS burst set configurations proposed in modalities 1-1 to 3-3 can be considered. When compensation is added, interference from
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    37/55
    SSBs from a neighboring cell can be reduced.
    <SS Burst Configuration>
    [0134] Now, a method of configuring an SS burst when a spacing between SSB subcarriers differs from a spacing between data subcarriers in a system that supports NR (New RAT) is described. In NR, the time / frequency resource grids are configured using a data numerology as a reference numerology. An SSB can be identical to or different from reference numerology and resource grids configured based on data numerology can be multiplexed.
    [0135] In addition, in the system that supports NR, each interval can include symbols for downlink control, a guard period for downlink / uplink switching and symbols for uplink control. Here, if a situation occurs in which an SSB and data that have spacing between different subcarriers are multiplexed, the SSB can be mapped overlaid with symbols for downlink control due to a difference in symbol duration. In this case, it is possible to avoid the collision between the SSB and symbols for data control according to the configuration of an SS burst, which is a bundle of SSBs.
    [0136] Meanwhile, a range can be made up of 14 OFDM symbols or 7 OFDM symbols in the current NR. As shown in Figures 16 (a) and (b), an SS burst configuration can vary according to the number of symbols in an interval. Consequently, a gNB needs to allocate 1 bit to the PBCH content to transmit information indicating whether the number of symbols in the current range is 7 or 14 for a UE and signal information about the number of symbols per range of a cell neighboring the UE via the PBCH content.
    [0137] In addition, an SSB discussed in NR is composed of a total of 4 symbols, including a PSS, an SSS and a PBCH, and 2 SSBs can be included in a range composed of 14 OFDM symbols and 1 SSB can be included on a
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    38/55 range consisting of 7 OFDM symbols.
    [0138] In addition, the SSB can have a spacing between subcarriers of 15 kHz or 30 kHz in bands of 6 GHz or less and 120 kHz or 240 kHz in bands of 6 GHz or higher. In contrast, a spacing between subcarriers for data can be any 15 kHz, 30 kHz, 60 kHz and 120 kHz. In addition, referring to the NR range structure currently discussed, a range includes 1 or 2 symbols for downlink control, a guard period and 2 symbols for uplink control when the range consists of 14 OFDM symbols. If a range is made up of 7 OFDM symbols, the range includes a symbol for downlink control, a guard period and 2 symbols for uplink control.
    [0139] Based on the above description, the present description describes a method of arranging SSBs in an interval when an SSB and data having different spacing between subcarriers are multiplexed.
    [0140] 4. SS burst configuration in bands of 6 GHz or lower [0141] The following describes methods of laying out SSBs when an SSB and data are multiplexed. A spacing between data subcarriers can be 15 kHz, 30 kHz or 60 kHz and a spacing between SSB subcarriers can be 15 kHz or 30 kHz in bands of 6 GHz or less. In addition, a symbol for a guard period for downlink / uplink switching, a symbol for uplink control and one or two symbols for downlink control are required at an interval. The methods of arranging SSBs in an SS burst based on the description above will be described in modalities 4-1 to 4-4. It is assumed that a set of SS bursts including the SS bursts described in modalities 4-1 to 4-4 is configured as shown in Figure 17.
    Mode 4-1 [0142] When SSBs having a spacing between subcarriers of 15 kHz and data having a spacing between subcarriers of 30 kHz are multiplexed in
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    39/55 an interval composed of 14 OFDM symbols, SSBs can be arranged as shown in Figure 18. In this case, SSBs with a spacing between subcarriers of 15 kHz are arranged so as not to interfere in the control regions, even when the spacing between data subcarriers is 15 kHz or 30 kHz. Here, considering the SS burst configurations and SS burst array configurations shown in Figures 17 and 18, a method of arranging SSBs within a 5 ms window can be organized as follows.
    [0143] - Spacing between 15 kHz subcarriers [0144] The first OFDM symbols of candidate SSBs have indices of {2, 8} + 14 * n. Here, n = 0, 1 for carrier frequencies less than or equal to 3 GHz and n = 0, 1,2, 3 for carrier frequencies greater than 3 GHz and less than or equal to 6 GH.
    Mode 4-2 [0145] When SSBs having a spacing between subcarriers of 30 kHz and data having a spacing between subcarriers of 60 kHz are multiplexed in a range composed of 14 OFDM symbols, SSBs can be arranged as shown in Figure 19. In this In this case, SSBs having a spacing between subcarriers of 30 kHz are arranged so as not to interfere in the control regions, even when the spacing between data subcarriers is 30 kHz or 60 kHz. Here, considering the SS burst configurations and SS burst set configurations shown in Figures 17 and 19, a method of arranging SSBs within a 5 ms window can be organized as follows.
    [0146] - Spacing between 30 kHz subcarriers [0147] The first OFDM symbols of candidate SSBs have indices of {2, 8} + 14 * n. Here, n = 0, 1 for carrier frequencies less than or equal to 3 GHz and n = 0, 1,2, 3 for carrier frequencies greater than 3 GHz and less than or equal to 6 GH.
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    40/55
    Mode 4-3 [0148] When SSBs having a spacing between subcarriers of 15 kHz and data having a spacing between subcarriers of 60 kHz are multiplexed in a range composed of 14 OFDM symbols, SSBs can be arranged as shown in Figure 20. In this case, SSBs having 15 kHz subcarrier spacing override the guard periods and uplink control symbols included in the first and third data intervals with 60 kHz subcarrier spacing and downlink control symbols included in the second and fourth data intervals. Consequently, the first and third intervals can be configured as downlink-only intervals without any uplink control symbol.
    Mode 4-4 [0149] When SSBs having a spacing between subcarriers of 15 kHz and data having a spacing between subcarriers of 30 kHz are multiplexed in a range composed of 7 OFDM symbols, SSBs can be arranged as shown in Figure 21. In this In this case, SSBs having a 15 kHz subcarrier spacing overlap with a guard period and an uplink control symbol included in the first data range having a 30 kHz subcarrier spacing and a downlink control symbol included in the second data range. Consequently, the first interval can be configured as a downlink-only interval without any uplink control symbol.
    [0150] 5. SS burst configuration in 6 GHz bands or higher [0151] Now, the SSB arrangement when SSBs and data are multiplexed in 6 GHz bands or higher is described based on modalities 5-1 to 5-3. A spacing between data subcarriers can be 60 kHz or 120kHz and a spacing between SSB subcarriers can be 120 kHz or 240 kHz in bands of 6 GHz or higher. In addition, a symbol for a guard period for the
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    41/55 downlink / uplink switching, one symbol for uplink control and one or two symbols for downlink control are required at an interval. Methods of arranging the SSBs in an SS burst based on the description above will be described in modalities 5-1 to 5-3. It is assumed that a set of SS bursts including the SS bursts described in modalities 5-1 to 5-3 is configured as shown in Figure 22.
    Mode 5-1 [0152] When SSBs having a spacing between subcarriers of 120 kHz and data having a spacing between subcarriers of 60 kHz are multiplexed in a range composed of 14 OFDM symbols, SSBs can be arranged as shown in Figure 23. In this case, SSBs with a spacing between 120 kHz subcarriers are arranged not to invade control regions, even when the spacing between data subcarriers is 60 kHz or 120 kHz. Here, considering the SS burst configurations and SS burst set configurations shown in Figures 22 and 23, a method of arranging the SSBs within a 5 ms window can be organized as follows.
    [0153] - Spacing between 120 kHz subcarriers [0154] The first OFDM symbols of candidate SSBs have indices of {4, 8, 16, 20} + 28 * n. Here, n = 0, 1, 2, 3, 5, 6, 7, 8, 10, 11, 12, 13, 15, 16, 17, 18 for carrier frequencies above 6 GHz.
    Mode 5-2 [0155] When SSBs having a spacing between subcarriers of 240 kHz and data having a spacing between subcarriers of 60 kHz or 120 kHz are multiplexed in a range composed of 14 OFDM symbols, SSBs can be arranged as shown in Figure 24. In this case, SSBs with a 240 kHz subcarrier spacing are arranged so as not to invade the control regions.
    [0156] Here, considering the SS burst settings and
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    42/55 set of SS bursts shown in Figures 22 and 24, a method of arranging the SSBs within a 5 ms window can be arranged as follows.
    [0157] - Spacing between 240 kHz subcarriers [0158] The first OFDM symbols of candidate SSBs have indices {8, 12, 16, 20, 32, 36, 40, 44} + 56 * n. Here, n = 0, 1, 2, 3, 5, 6, 7, 8 for carrier frequencies above 6 GHz.
    Mode 5-3 [0159] Arrangement of SSBs when SSBs with a spacing between subcarriers of 120 kHz or 240 kHz and data having a spacing between subcarriers of 60 kHz are multiplexed in a range composed of 14 OFDM symbols was described in modalities 5-1 and 5-2. In addition, when considering all SS burst configurations and SS burst set configurations, data control regions having a 60 kHz subcarrier spacing may not be guaranteed as shown in Figure 26 in the case of a burst set Specific SS as shown in Figure 25.
    [0160] In other words, if a set of SS bursts is configured as shown in Figure 25 and an SS burst is configured as in 5-1 mode, a space period for uplink control transmission or a downlink control symbol can overlap with SSBs, as shown in Figure 26.
    [0161] Thus, to ensure a guard period for uplink control and 2 downlink control symbols in a specific SS burst configuration and SS burst configuration, the SS burst configuration shown in Figure 26 can be reconfigured as shown in Figure 27. In addition, when the spacing between SBS subcarriers is 240 kHz, SSBs can be arranged corresponding to the positions of SSBs with a spacing between subcarriers of 120 kHz. For example, 2 SSBs having a 240 kHz subcarrier spacing can be arranged in a duration corresponding to an SSB with a
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    43/55 spacing between 120 kHz subcarriers.
    [0162] This is, when SSBs are arranged from the central part of an interval having a spacing between subcarriers of 60 kHz, the SS burst set configuration can be represented as shown in Figures 28 and 29. Here, Figure 28 shows a case in which the spacing between SSB subcarriers is 120 kHz and Figure 29 shows a case in which the spacing between SSB subcarriers is 240 kHz.
    [0163] Here, considering the SS burst configurations and SS burst set configurations shown in Figures 25 and 27 to 29, a method of arranging the SSBs within a 5 ms window can be organized as follows.
    [0164] - Spacing between 120 kHz subcarriers [0165] The first OFDM symbols of candidate SSBs have indices {4, 8, 16, 20, 32, 36, 44, 48} + 70 * n. Here, n = 0, 2, 4, 6 for carrier frequencies greater than 6 GHz.
    [0166] The first OFDM symbols for candidate SSBs have indices {2, 6, 18, 22, 30, 34, 46, 50} + 70 * n. Here, n = 1, 3, 5, 7 for carrier frequencies above 6 GHz.
    [0167] - Spacing between 240 kHz subcarriers [0168] The first OFDM symbols of candidate SSBs have indices {8, 12, 16, 20, 32, 36, 40, 44, 64, 68, 72, 76, 88, 92 , 96, 100} + 140 * n. Here, n = 0, 2 for carrier frequencies greater than 6 GHz.
    [0169] The first OFDM symbols of candidate SSBs have indices {4, 8, 12, 16, 36, 40, 44, 48, 60, 64, 68, 72, 92, 96, 100, 104} + 140 * n. Here, n = 1.3 for carrier frequencies greater than 6 GHz.
    [0170] When an SS burst is configured as described above, the symbols on which the SSBs are transmitted are fixed regardless of the spacing between subcarriers in bands of 6 GHz or higher. That is, SSBs can be
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    44/55 transmitted from the third to the sixth and the ninth to the twelfth symbols when a spacing between interval subcarriers is 60 kHz, and the SSBs can be transmitted in symbols aligned in time with the symbol positions in which the SSBs are transmitted in an interval having a spacing between subcarriers of 60 kHz when the SSBs have a spacing between subcarriers of 120 kHz and 240 kHz from the point of view of the SSBs.
    [0171] Therefore, when a UE detects an SSB based on the description above, the UE can estimate the positions of the remaining SSBs. In addition, SSBs can be used for measurement using such information. If the combination of SSBs is allowed in an SS burst, an additional combination gain can be obtained.
    <Method of indicating the actual transmitted synchronization signal block (ATSS)>
    [0172] 6. General ATSS indication method [0173] Hereinafter, the methods of indicating an ATSS to a UE in a system that supports NR (New RAT) will be described. In the current NR, all SSBs are positioned within a 5 ms window, regardless of the periodicity of SS burst sets. The number of SSBs that need to be positioned at 5 ms is defined according to the frequency range.
    [0174] That is, a maximum of 4 SSBs are arranged in 5 ms in bands of 3 GHz or less and a maximum of 8 SSBs are arranged in 5 ms in bands from 3 GHz to 6 GHz. A maximum of 64 SSBs can be arranged in 5 ms in bands of 6 GHz or higher.
    [0175] In addition, SSBs can have a spacing between subcarriers of 15 kHz or 30 kHz in bands of 6 GHz or less and 120 kHz or 240 kHz in bands of 6 GHz or higher. Meanwhile, the positions at which SSBs can be transmitted in an SS burst set are defined by spacing
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    45/55 between subcarriers in standard documents.
    [0176] It is assumed that an ATSS is indicated through the minimum remaining system information (RMSI) or other system information (OSI) in the present modality.
    [0177] To signal ATSS information about a maximum of 64 SSBs, there is a method of signaling only the number of SSBs transmitted and a method of signaling information about all positions using a bitmap. According to the method of signaling only the number of ATSSs, ATSSs can be indicated using only 6 bits, but the flexibility with respect to SSB transmission of a gNB decreases. In contrast, the method using a bitmap provides full flexibility for gNB, but requires a maximum of 64 bits.
    [0178] However, allocating a 64-bit resource to all neighboring cells can cause considerable overhead. Consequently, several ATSS indication methods to efficiently indicate an ATSS need to be considered. Therefore, the modes of indicating an ATSS in a system supporting NR are described in the present embodiment.
    [0179] A maximum number of SSBs that can be transmitted in frequency bands of 3 GHz or less is 4 and a maximum number of SSBs that can be transmitted in frequency bands from 3 GHz to 6 GHz is 8. The positions in which SSBs can be transmitted by frequency band can be defined as shown in Figure 30 (a). Now, specific methods for indicating an ATSS will be described.
    Mode 6-1 [0180] This is a method of indicating only a total number of SSBs transmitted. That is, a maximum of 4 SSBs are transmitted in bands of 3 GHz or less and therefore 2 bits are required, and a maximum of 8 SSBs are transmitted in frequency bands from 3 GHz to 6 GHz and, therefore, 3 bits are required. . In this
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    46/55 case, the flexibility in the transmission of SSB decreases although a small number of bits is used. That is, a gNB needs to sequentially transmit the total number of SSBs from SSB # 0 because gNB knows only the total number of SSBs. For example, if the number of SSBs transmitted is 3, SSB # 0, SSB # 1 and SSB # 2 are transmitted in Figure 30 (a).
    Mode 6-2 [0181] This is a method of indicating information about the SSBs transmitted using a bitmap. That is, a maximum of 4 SSBs are transmitted in bands of 3 GHz or less and therefore 4 bits are used, and a maximum of 8 SSBs are transmitted in frequency bands from 3 GHz to 6 GHz and, therefore, 8 bits are used . In this case, full flexibility in the transmission of SSB can be provided although the number of bits used increases in comparison with mode 6-1. That is, a gNB can select desired SSBs from SSBs # 0 to # 7 and transmit the selected SSBs because 1 bit is allocated per SSB index.
    [0182] However, a maximum number of SSBs is 64 in 6 GHz or higher frequency bands and the positions in which SSBs can be transmitted in 6 GHz or higher bands are defined as type 1 or type 2 in Figure 30 (B). To carry out a fully flexible transmission through a bitmap, as in bands of 6 GHz or less, 64 bits are required. The 64-bit number can act as a considerable overhead, although the ATSS indication is performed using RMSI / OSI. Therefore, an ATSS can be indicated using methods 6-3 to 6-7 to provide maximum flexibility with a smaller number of bits, although total flexibility cannot be supported.
    Mode 6-3 [0183] This is a method of indicating only a total number of SSBs transmitted. That is, a maximum of 64 SSBs are transmitted in bands of 6 GHz or higher and therefore 6 bits are used. In this case, flexibility in transmission
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    Ϊ7Ι55 of SSB decreases although a small number of bits is used. That is, a gNB needs to transmit the total number of SSBs starting from SSB # 0 because gNB only knows the total number of SSBs. For example, referring to type 1 of Figure 30 (b), if the number of SSBs transmitted is 16, 16 SSBs from SSB # 0 to SSB # 15 are transmitted.
    Mode 6-4 [0184] Only the total number of SSBs transmitted is indicated and the SSBs to be transmitted can be divided into groups of SSBs and transmitted. In the present embodiment, it is assumed that a single group of SSBs includes 8 SSBs as in type 2 of Figure 20 (b). It takes 6 bits for a gNB to signal information about the number of ATSSs between 64 SSBs to a UE, and the number of SSBs actually transmitted per group of SSBs can be recognized using the information. The number of SSBs actually transmitted is calculated by the following equation 1.
    [Equation 1] # of SSBs actually transmitted = N # of SSBs actually transmitted by group of SSBs
    NN 8 , if SSB group index> N - 8 * 8 NN .8. + 1, if SSB group index <N - 8 * .8.
    [0185] Here, when the number of ATTSs per group of SSBs is indicated, it can be assumed that ATSSs are transmitted sequentially from the beginning of a group of SSBs.
    Mode 6-5 [0186] An ATSS can be indicated indicating information related to the transmission of the group of SSBs using a bitmap and indicating information about the number of SSBs in a group of SSBs using bits other than the bitmap.
    [0187] For example, 64 SSBs can be divided into 8 SSB groups as in type 2 of Figure 30 (b) and an 8-bit bitmap can be transmitted to
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    48/55 signaling information about SSB groups used to transmit ATSS to a UE. When the regions in which SSBs can be transmitted are defined as type 2 of Figure 30 (b), there is an advantage that the limits of the SSB groups are aligned with the limits of the intervals having a spacing between subcarriers of 60 kHz when the SSBs they are multiplexed with the intervals having the spacing between subcarriers of 60 kHz. Therefore, when groups of SSBs are used using a bitmap, the UE is able to know whether SSBs are transmitted per interval for all spacing between subcarriers in frequency bands of 6 GHz or higher.
    [0188] In addition, for indication of ATSS, additional information is needed to indicate which SSB among 8 SSBs in each group of SSBs is transmitted. Consequently, a method of signaling information about how many SSBs are used among 8 SSBs included in a group of SSBs can be used using additional bits. Here, 3 bits are needed to signal information about the number of SSBs actually used among the 8 SSBs included in a group and the corresponding information needs to be applied equally to all SSB groups.
    [0189] For example, if SSB Group # 0 and SSB Group # 1 are indicated by bitmap information and the transmission of 3 SSBs in a group of SSBs is indicated by means of the 3 bit information, Group SSBs # 0 and SSB Group # 1 will include 3 SSBs respectively and thus a total number of ATSSs is 6. Here, SSBs are sequentially arranged in the SSB group from the position of the first candidate SSB.
    [0190] If the 8-bit bitmap information to indicate a group of SSBs used is 00000000 (all zero), a different indication method than mode 6-5 can be applied. This will be described in detail through modality 7, which will be described later.
    Mode 6-6
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    49/55 [0191] An ATSS can be indicated indicating information related to the transmission of the group of SSBs using a bitmap and indicating information about the number of SSBs in a group of SSBs using bits other than the bitmap.
    [0192] For example, 64 SSBs can be divided into 8 SSB groups as in type 2 of Figure 30 (b) and an 8-bit bitmap can be transmitted to signal information about SSB groups used for transmitting ATSS to a UE. When the regions in which SSBs can be transmitted are defined as type 2 in Figure 30 (b), there is an advantage that the limits of the SSB groups are aligned with the limits of the intervals having a spacing between subcarriers of 60 kHz when the SSBs are multiplexed with the intervals having a spacing between subcarriers of 60 kHz. Therefore, when groups of SSBs are used using a bitmap, the UE is able to know whether SSBs are transmitted per interval for all spacing between subcarriers in frequency bands of 6 GHz or higher.
    [0193] For indication of ATSS, additional information is needed to indicate which SSB among 8 SSBs in each group of SSBs is transmitted. Consequently, a method of signaling information about how many SSBs are used among 8 SSBs included in a group of SSBs can be used using additional bits. 6 bits are required to signal information about the number of SSBs actually used among the 64 SSBs, and the number of ATSSs transmitted in a group of SSBs can be recognized using the corresponding information. This is calculated by the following equation 2.
    [Equation 2] # of SSB groups actually transmitted = B (defines the SSB Group Index actually transmitted: AT SSB Group # 0 ~ AT SSB Group # B-1) # of SSBs actually transmitted = N
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    50/55 # of SSBs actually transmitted by SSB Group
    N
    ΒΓ if AT index of SSB group> N - B * + 1, and AT index of SSB group
    N
    B
    N * -
    LbJ [0194] Here, when the number of ATSSs per group of SSBs is indicated, it can be assumed that ATSSs are transmitted sequentially from the beginning of each group of SSBs.
    [0195] If the 8-bit bitmap information to indicate a group of SSBs used is 00000000 (all zero), an indication method other than mode 6-6 can be applied. This will be described in detail through modality 7, which will be described later.
    Mode 6-7 [0196] An ATSS can be indicated by indicating the information related to the transmission of the group of SSBs using a bitmap and indicating whether the SSBs in a group of SSBs are transmitted using bits other than the bitmap.
    [0197] For example, 64 SSBs can be divided into 8 SSB groups as in type 2 of Figure 30 (b) and an 8-bit bitmap can be transmitted to signal information about SSB groups used for transmitting ATSS to a UE. When regions in which SSBs can be transmitted are defined as type 2 in Figure 30 (b), there is an advantage that the limits of the SSB groups are aligned with the limits of the ranges having a spacing between subcarriers of 60 kHz when the SSBs they are multiplexed with the intervals having the spacing between subcarriers of 60 kHz. Therefore, when groups of SSBs are used using a bitmap, the UE is able to know whether SSBs are transmitted per interval for all spacing between subcarriers in frequency bands of 6 GHz or higher.
    [0198] In addition, for indication of ATSS, additional information is needed to indicate which SSB out of 8 SSBs in each group of SSBs is transmitted.
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    51/55
    Consequently, information about which SSBs out of 8 SSBs included in a group of SSBs are transmitted can be signaled using a bitmap. In this case, 8 bits are required because the bitmap information about 8 SSBs included in a group of SSBs needs to be transmitted and the corresponding information needs to be applied equally to all SSB groups. For example, if the use of SSB Group # 0 and SSB Group # 1 is indicated by means of a bitmap over SSB groups and the transmission of the first and fifth SSB in a group of SSBs is indicated by a bitmap over SSBs, the first and fifth SSB in SSB Group # 0 and SSB Group # 1 are transmitted and therefore a total number of ATSSs is 4.
    [0199] If the 8-bit bitmap information to indicate a group of SSBs used is 00000000 (all zero), a different indication method than mode 6-7 can be applied. This will be described in detail through modality 7, which will be described later.
    [0200] When an ATSS is indicated as in modalities 6-1 to 6-7, a compensation in relation to an SSB position in a 5 ms window can also be indicated. In addition, UEs can assume that there is no ATSS for a duration corresponding to the indicated compensation. However, although the cells included in a list of cells transmitted to the UEs can use the indication methods described above from modalities 6-1 to 6-7, a standard format can be defined for cases where a cell that is not included in the cell list can be detected. In addition, a procedure may be required to recheck the ATSS information signaled to the UEs via ISMS or OSI via EU-dedicated RRC signaling. For example, when a group of SSBs including ATSSs is indicated using 8 bits and then the ATSS indices in the indicated group of SSBs are indicated using 8 bits as in 6-7 mode, a procedure to recheck ATSSs using a bitmap complete
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    52/55 through RRC signaling can be carried out similarly to mode 6-2. [0201] 7. ATSS indication methods under specific conditions [0202] Mode 7 describes the ATSS indication mechanisms that can be used when the 8-bit bitmap for SSB group indication is 00000000 (all zero) in the modalities described above 6-5 to 6-7, as shown in Figure 31. Here, bits other than the 8 bits for SSB group indication can be used for ATSS indication. That is, with respect to Figure 31, bits included in the part “bit for indicating SSBs actually transmitted from the group of SSBs” can be used. The specific mechanisms for indicating ATSS are described through modalities 7-1 to 7-4.
    Mode 7-1 [0203] The locations of ATSSs can be defined in the form of a standard. When the number of bits in the “bit for SSB indication actually transmitted in the SSB group” of Figure 31 is K, at least one of a maximum of 2 K patterns can be indicated using the K bits. When the standard is indicated, a UE can operate on the assumption that ATSSs are transmitted in the standard.
    Mode 7-2 [0204] A group of SSBs used for ATSSs between groups of SSBs is indicated for the UE using K bits as a bitmap. The UE operates on the assumption that 8 SSBs that can be included in the indicated SSB group are all ATSS.
    Mode 7-3 [0205] An SSB that is an ATSS among the initial K SSBs is indicated for the UE using K bits as a bitmap. The UE operates on the assumption that the SSB is repeatedly transmitted in a 5 ms window, using the indicated K pieces of ATSS information as a standard.
    Mode 7-4 [0206] ATSS frequency and a total number of transmitted ATSSs can
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    53/55 be indicated using K bits. Some of the K bits are used to indicate ATSS frequency and the remaining bits are used to indicate the number of ATSSs. Consequently, the UE can acquire ATSS location information through the ATSS frequency and information on the number of ATSSs.
    [0207] When an ATSS is indicated as in modalities 7-1 to 7-4, a compensation in relation to the location of the SSB within a 5 ms window can also be indicated. The UE can assume that there is no ATSS for a duration corresponding to the indicated compensation.
    [0208] With reference to Figure 32, a 3300 communication device includes a 3310 processor, a 3320 memory, an RF 3330 module, a 3340 display module and a User Interface (Ul) 3350 module.
    [0209] The communication device 3300 is shown as having the configuration illustrated in Figure 32, for the convenience of the description. Some modules can be added or omitted from the 3300 communication device. In addition, one module of the 3300 communication device can be divided into more modules. The 3310 processor is configured to perform operations according to the modalities of the present description described above with reference to the drawings. Specifically, for detailed 3310 processor operations, the descriptions in Figures 1 to 31 can be referred to.
    [0210] The 3320 memory is connected to the 3310 processor and stores an operating system (OS), applications, program codes, data, etc. The RF 3330 module, which is connected to the 3310 processor, converts a baseband signal to an RF signal or decodes an RF signal to a baseband signal. For this purpose, the RF 3330 module performs digital-to-analog conversion, amplification, filtering and frequency conversion or performs these processes in reverse. The 3340 display module is connected to the 3310 processor and displays various types of information. The 3340 display module can be configured as,
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    54/55 not limited to, a known component, such as a liquid crystal display (LCD), a Light Emitting Diode (LED) screen, and an Organic Light Emitting Diode (OLED) screen. The UI 3350 module is connected to the 3310 processor and can be configured with a combination of known user interfaces, such as a keyboard, a touchscreen, etc.
    [0211] The modalities of the present description described above are combinations of elements and characteristics of the present description. The elements or characteristics can be considered selective, unless otherwise indicated. Each element or characteristic can be practiced without being combined with other elements or characteristics. In addition, an embodiment of the present description can be constructed by combining parts of the elements and / or characteristics. The operating orders described in the modalities of the present description can be rearranged. Some constructions of any of the modalities can be included in another modality and can be replaced by corresponding constructions of another modality. It is obvious to those skilled in the art that claims that are not explicitly cited to one another in the appended claims can be presented in combination as a form of the present description or included as a new claim for a subsequent change after the application is filed.
    [0212] A specific operation described as performed by a BS can be performed by an upper node of the BS. That is, it is evident that, in a network composed of a plurality of network nodes including a BS, several operations performed for communication with a UE can be performed by the BS, or network nodes other than the BS. The term ‘BS’ can be replaced by ‘fixed station’, ‘Node B’, ‘evolved Node B (eNode B or eNB)’, ‘Access Point (AP)’, etc.
    [0213] The modalities of this description can be achieved by several means, for example, hardware, unalterable software, software or
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    55/55 combination thereof. In a hardware configuration, methods according to the exemplary modalities of this description can be achieved by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), processors, controllers, microcontrollers, microprocessors, etc.
    [0214] In an unalterable software or software configuration, a modality of the present description can be implemented in the form of a module, a procedure, a function, etc. The software code can be stored on a memory unit and executed by a processor. The memory unit is located inside or outside the processor and can transmit and receive data to and from the processor through various known means.
    [0215] Those skilled in the art will appreciate that the present description can be carried out in other specific ways than those established here without abandoning the spirit and essential characteristics of the present description. The above modalities are, therefore, to be interpreted in all aspects as illustrative and not restrictive. The scope of the description must be determined by the appended claims and their legal equivalents, not by the description above, and any changes that fall within the meaning and equivalence range of the appended claims are intended to be included in them.
    [Industrial Applicability] [0216] Although the method for transmitting and receiving a synchronization signal block and its apparatus have been described with a focus on examples in which they are applied to 5G New RAT, the method and apparatus may be applied to several wireless communication systems in addition to 5G New RAT.
    权利要求:
    Claims (13)
    [1]
    1. Method for receiving a sync signal block (SSB) by a UE in a wireless communication system, FEATURED by the fact that it comprises:
    receive at least one SSB mapped to a plurality of symbols, where two regions for candidate SSBs in which at least one SSB can be received are allocated in a specific length of time including the plurality of symbols, where a time between the two regions, one time before the two regions and one time after the two regions are identical in the specific length of time.
    [2]
    2. Method, according to claim 1, CHARACTERIZED by the fact that the candidate SSBs are arranged consecutively by a first number in each of the two regions.
    [3]
    3. Method, according to claim 1, CHARACTERIZED by the fact that 4 symbols are included in the identical time, when a spacing between SSB subcarriers is a first value, and 8 symbols are included in the same time when the spacing between SSB subcarriers is a second value.
    [4]
    4. Method, according to claim 1, CHARACTERIZED by the fact that the regions for the candidate SSBs are consecutively arranged by a second number in units of the specific time duration in a half-frame and then arranged again consecutively by the second number after a predetermined time.
    [5]
    5. Method according to claim 4, CHARACTERIZED by the fact that the regions for candidate SSBs are consecutively arranged by the second number in units of the specific time duration when the spacing between SSB subcarriers is the first value, the regions being repeatedly arranged four times in a predetermined time interval.
    Petition 870190003298, of 11/01/2019, p. 73/107
    2/3
    [6]
    6. Method according to claim 5, CHARACTERIZED by the fact that the number of intervals included in the predetermined time is 2 when the spacing between SSB subcarriers is the first value and the number of intervals included in the predetermined time is 4 when the spacing is between SSB subcarriers is the second value.
    [7]
    7. Method, according to claim 1, CHARACTERIZED by the fact that a frequency band in which the UE operates is greater than a specific value.
    [8]
    8. Method, according to claim 1, CHARACTERIZED by the fact that the identical time is composed of two symbols.
    [9]
    9. Method, according to claim 1, CHARACTERIZED by the fact that the specific length of time in which the two regions are allocated is repeatedly arranged by a specific number determined based on the frequency band in which the UE operates in a manner located in a half frame.
    [10]
    10. Method, according to claim 9, CHARACTERIZED by the fact that the specific number is 2 when the frequency band in which the UE operates is equal to or less than the specific value and 4 when the frequency band in which the UE operates is greater than the specific value.
    [11]
    11. UE that receives a synchronization signal block (SSB) in a wireless communication system, FEATURED by the fact that it comprises:
    a transceiver to transmit / receive signals to / from a base station, and a processor connected to the transceiver to control the transceiver to receive at least one SSB mapped to a plurality of symbols, where two regions for candidate SSBs in which at least one SSB can be received, they are allocated in a specific length of time, including the plurality of symbols, where a time between the two regions, a time before the two regions and
    Petition 870190003298, of 11/01/2019, p. 74/107
    3/3 a time after the two regions are identical in the specific length of time.
    [12]
    12. Method for transmitting a synchronization signal block (SSB) through a base station in a wireless communication system, CHARACTERIZED by the fact that it comprises:
    transmit at least one SSB mapped to a plurality of symbols, where two regions for candidate SSBs in which at least one SSB can be received, are allocated in a specific length of time, including the plurality of symbols, where a time between the two regions , a time before the two regions and a time after the two regions are identical in the specific length of time.
    [13]
    13. Base station that transmits a synchronization signal block (SSB) in a wireless communication system, CHARACTERIZED by the fact that it comprises:
    a transceiver for transmitting / receiving signals to / from a UE; and a processor connected to the transceiver to control the transceiver to transmit at least one SSB mapped to a plurality of symbols, where two regions for candidate SSBs in which at least one SSB can be received, are allocated in a specific length of time, including the plurality of symbols, where a time between the two regions, a time before the two regions and a time after the two regions are identical in the specific length of time.
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    法律状态:
    2021-10-13| B350| Update of information on the portal [chapter 15.35 patent gazette]|
    优先权:
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    US201762520451P| true| 2017-06-15|2017-06-15|
    US201762520705P| true| 2017-06-16|2017-06-16|
    US201762542209P| true| 2017-08-07|2017-08-07|
    US201762542207P| true| 2017-08-07|2017-08-07|
    US201762558872P| true| 2017-09-15|2017-09-15|
    US201762561153P| true| 2017-09-20|2017-09-20|
    PCT/KR2018/006448|WO2018230879A1|2017-06-15|2018-06-07|Method for transmitting and receiving synchronization signal block and device therefor|
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