method for transmitting and receiving downlink data channel and respective device

专利摘要:
The present invention relates to a method by which a terminal receives a shared physical downlink channel (PDSCH) in a wireless communication system. More particularly, the method comprises: receiving, from a first part of bandwidth (BWP), downlink control information (DCI) including first information to change an active BWP from the first BWP to a second BWP, and second information related to at least one transmission block (TB) for the PDSCH; and receive the PDSCH from the second BWP based on the first information and the second information, where when the number of first programmable TBs through the second information is equal to one and the number of second programmable TBs for the second BWP is equal to 2, information related to the second TB among the second TBs is disabled.
公开号:BR112020002285A2
申请号:R112020002285-3
申请日:2019-04-05
公开日:2020-07-28
发明作者:Daesung Hwang；Yunjung Yi
申请人:Lg Electronics Inc.；
IPC主号:

专利说明:

[001] [001] The present invention relates to a method for transmitting and receiving a downlink data channel and a respective apparatus. More specifically, the method and apparatus for interpreting information included in DCI (Downlink Control Information) for transmitting and receiving the PDSCH when the DCI (Downlink Control Information) received in the former BWP (part of Lar- Bandwidth) programs the PDSCH (Shared Physical Downlink Channel) received in the new BWP. PREVIOUS TECHNIQUE
[002] [002] As more and more communication devices demand more communication traffic along with current trends, a future generation 5th generation (5G) system is needed to provide enhanced wireless broadband communication, compared to the system Legacy LTE. In the future generation 5G system, the communication scenarios are divided into improved mobile broadband (eMBB), ultra-reliable and low latency communication (URLLC), massive machine-type communication (mMTC) and so on.
[003] [003] Here, eMBB is a future generation mobile communication scenario characterized by high spectral efficiency, high data rate for user experience and high peak data rate, URLLC is a future generation mobile communication scenario characterized by ultra-high reliability, ultra-low latency and ultra-high availability (for example, vehicle-for-everything (V2X), emergency service and remote control), and mMTC is a future generation mobile communications scenario characterized for low cost, low energy, short package and massive connectivity (for example, Internet of Things (IoT)). For traffic in line with current trends, a next generation 5G system is needed, which is a wireless broadband communication system evolved from LTE. In a next generation 5G system called NewRAT, the communication scenarios are divided into improved mobile broadband (eMBB), ultra-reliable and low latency communication (URLLC), massive machine type communication (mMTC) etc. DISCLOSURE TECHNICAL PROBLEM
[004] [004] An object of the present invention is to provide a method for transmitting and receiving a downlink data channel and a respective device.
[005] [005] It will be appreciated by persons skilled in the art that objects that could be achieved with the present invention are not limited to what was described above above and that the objects above and others that the present invention could achieve will be more clearly understood from the detailed description below. TECHNICAL SOLUTION
[006] [006] A general aspect of the present invention includes a method of receiving a shared physical downlink channel (PDSCH) by user equipment (UE) in a wireless communication system, the method including: receiving, in a first part of bandwidth (BWP), a down-link control (DCI) information that includes first information indicating the switching of an active BWP from the first BWP to a second BWP and second information related to the programming of at least one transport block (TB) for the PDSCH. The method also includes receiving, in the second BWP, the PDSCH based on the first information and the second information, where based on a number of TBs in a first group of TBs, which can be programmed through the second information, being equal to one, and based on a number of TBs in a second group of TBs,
[007] [007] Implementations may include one or more of the following features. The device on which the second information related to the programming of at least one TB includes: a set of bits related to a modulation and coding scheme (MCS), a new data indicator (NDI) and a redundancy version (RV ). The method in which the information related to the second TB is filled with zero. The device on which the information related to the second TB is ignored. The device on which the transmission configuration information (TCI) for the second BWP is the same as the DCI related TCI information. The method in which DCI related TCI information includes: TCI information for a Control Resource Set (CORESET) that is related to DCI. Implementations of the techniques described can include computer hardware, a method or process or software in a computer-accessible medium.
[008] [008] Another general aspect includes a device configured to receive a shared physical downlink channel (PDSCH) in a wireless communication system, the device including: at least one processor; and at least one memory operationally connectable to at least one processor and storage instructions that, when executed by at least one processor, perform operations including: receiving, in a first part of bandwidth (BWP), information downlink control (DCI) that includes first information that indicates the switching of an active BWP from the first BWP to a second BWP, and second information related to the programming of at least one transport block (TB) for the PDSCH . The operations also include receiving, in the second BWP, the PDSCH based on the first information and the second information, where based on a number of TBs in a first group of TBs, which can be programmed through the second information, being equal to one, and based on a number of TBs in a second group of TBs, which can be programmed for the second BWP, being equal to two: among the second information related to the programming of at least one TB, the information related to a second TB among the second group of TBs is disabled. Other embodiments of this aspect include computer systems, apparatus and corresponding computer programs recorded on one or more computer storage devices, each configured to perform the actions of the methods.
[009] [009] Implementations may include one or more of the following features. The device on which the second information related to the programming of at least one TB includes: a set of bits related to a modulation and coding scheme (MCS), a new data indicator (NDI) and a redundancy version (RV ). The device on which the information related to the second TB is filled with zero. The device on which the information related to the second TB is ignored. The device on which the transmission configuration information (TCI) for the second BWP is the same as the TCI information related to the DCI. The device on which DCI-related TCI information includes: TCI information for a Control Resource Set (CORESET) that is related to DCI.
[010] [010] Another general aspect includes a user equipment (UE) configured to receive a shared physical downlink channel (PDSCH) in a wireless communication system, the UE including: a transceiver. The user equipment also includes at least one processor; and at least one memory operably connectable to at least one processor and storing instructions that, when executed by at least one processor, perform operations including: receiving, in a first part of bandwidth (BWP), control information downlink control (DCI) that includes (i) first information indicating the switching from an active BWP from the first BWP to a second BWP, and (ii) second information related to the programming of at least one transport block (TB) for the PDSCH. The operations also include receiving, in the second BWP, the PDSCH based on the first information and the second information, where based on a number of TBs in a first group of TBs, which can be programmed through the second information, being equal to one , and based on a number of TBs in a second group of TBs, which can be programmed for the second BWP, being equal to two: among the second information related to the programming of at least one TB, the information related to a second TB among the second group of TBs are disabled. Other modalities of this aspect include computer systems, devices and corresponding computer programs recorded on one or more computer storage devices, each configured to carry out the actions of the methods.
[011] [011] Another general aspect includes a method of transmitting a physical downlink shared channel (PDSCH) in a wireless communication system, the method including: transmitting, in a first part of bandwidth (BWP), a downlink control information (DCI) that includes first information that indicates the switching of an active BWP from the first BWP to a second BWP, and second information related to the programming of at least one transport block (TB) for the PDSCH. The method also includes transmitting, in the second BWP, the PDSCH based on the first information and the second information, where based on a number of TBs, in a first group of TBs that can be programmed through the second information, being equal to one , and based on a number of TBs, in a second group of TBs that can be programmed for the second BWP, being equal to two: among the second information related to the programming of at least one TB, the information related to a second TB among the second group of TBs are disabled. Other embodiments of this aspect include computer systems, apparatus and corresponding computer programs recorded on one or more computer storage devices, each configured to perform the actions of the methods.
[012] [012] Another general aspect includes a base station (BS) configured to transmit a shared physical downlink channel (PDSCH) in a wireless communication system, to BS including: a transceiver. The base station also includes at least one processor; and at least one memory operationally connectable to at least one processor and storing instructions that, when executed by at least one processor, perform operations including: transmitting, in a first part of bandwidth (BWP), information of down-link control (DCI) that includes first information indicating the exchange of an active BWP from the first BWP to a second BWP, and second information related to the programming of at least one transport block (TB) for the PDSCH. The operations also include transmitting, in the second BWP, the PDSCH based on the first information and the second information, where based on a number of TBs, in a first group of TBs that can be programmed through the second information, equal to one, and based on a number of TBs, in a second group of TBs that can be programmed for the second BWP, being equal to two: among the second information related to the programming of at least one TB, information related to a second TB among the second group of TBs are disabled. Other embodiments of this aspect include computer systems, apparatus and corresponding computer programs recorded on one or more computer storage devices, each configured to perform the actions of the methods.
[013] [013] All or part of the features described in this application may be implemented as a computer program product, including instructions that are stored on one or more non-transitory, machine-readable storage media and that are executable on one or more computer devices. processing. All or part of the features described in this application can be implemented as an apparatus, method or electronic system that can include one or more processing and memory devices to store executable instructions for implementing the declared functions. ADVANTAGE EFFECTS
[014] [014] According to the present invention, it is possible to transmit and receive the downlink data channel in a stable and unambiguous way, even when the old BWP configuration (part of bandwidth) and the new BWP configuration are different.
[015] [015] It will be appreciated by persons skilled in the art that the effects that could be achieved with the present invention are not limited to what was described above above and that other advantages of the present invention will be more clearly understood from the detailed description below in conjunction with the accompanying drawings. DESCRIPTION OF THE DRAWINGS
[016] [016] Figure 1 is a diagram showing an example of a control plan and a user plan structure for a wireless interface protocol between a terminal and an E-UTRAN based on the radio access network standard 3GPP;
[017] [017] Figure 2 is a diagram showing an example of a physical channel used in 3GPP system and a method of transmitting general signal using said channel;
[018] [018] Figures 3 to 5 are diagrams showing examples of radio frame structures and partitions used in a wireless communication system;
[019] [019] Figure 6 is a diagram showing an example of a hybrid beam-forming structure in terms of a transceiver unit (TXRU) and a physical antenna;
[020] [020] Figure 7 is a diagram showing an example of a beam scan operation for a synchronization signal and system information in a downlink transmission process;
[021] [021] Figure 8 is a diagram showing an example of a cell in a new radio access technology (NR) system;
[022] [022] Figure 9 is a diagram showing an example of HARQ-ACK timing in the NR system;
[023] [023] Figures 10 to 11 are diagrams showing examples of HARQ-ACK transmission in units of a group of code blocks (CBG) in the NR system;
[024] [024] Figures 12 to 14 are diagrams showing examples of HARQ-ACK transmission in Carrier Aggregation (CA);
[025] [025] Figures 15 to 17 are diagrams showing examples of operations of a terminal, a BS and a network for transmitting and receiving HARQ-ACK according to the implementations of the present invention;
[026] [026] Figure 18 is a diagram showing an example where the DCI programs the PDSCH according to implementations of the present invention;
[027] [027] Figures 19 to 21 are diagrams showing examples of operations of a terminal, a base station and a network for transmitting and receiving a PDSCH according to implementations of the present invention; and
[028] [028] Figure 22 is a block diagram that illustrates an example of components of a wireless device according to implementations of the present invention. BEST MODE
[029] [029] In the following, the structure, operation and other features of the present invention will be easily understood by the implementations of the present invention described with reference to the accompanying drawings. The implementations described below are examples in which the technical resources of the present invention are applied to a 3GPP system.
[030] [030] Although the present specification describes an implementation of the present invention using an LTE system, an LTE-A system and an NR system, implementations of the present invention can be applied to any suitable communication system that is compatible with the above standards.
[031] [031] Furthermore, although the present invention uses specific terminology, such as a remote radio head (RRH), an eNB, a transmission point (TP), a reception point (RP), a retransmitter and the like, implementations of the present invention can be applied to more general systems using similar resources.
[032] [032] 3GPP-based communication standards typically include physical downlink channels corresponding to resource elements that carry information originating from an upper layer, as well as physical downlink signals used by the physical layer, but corresponding to resource elements that do not carry information originating from an upper layer.
[033] [033] For example, physical downlink channels may include a shared physical downlink channel (PDSCH), a physical transmission channel (PBCH), a multicast physical channel (PMCH), a physical control format indicator channel , a physical downlink control channel (PDCCH) and a physical hybrid ARQ indicator channel (PHICH).
[034] [034] Physical downlink signals can include a reference signal and a synchronization signal. A reference signal (RS), also referred to as a pilot, refers to a signal of a specific and predetermined waveform that is known by the gNB and the UE. Examples of downlink reference signals include, for example, a cell-specific RS, a UE-specific RS (UE-RS), a positioning RS (PRS) and channel status RS (CSI-RS).
[035] [035] For uplink communications, 3GPP-based communication standards typically include physical uplink channels corresponding to resource elements that carry information originating from an upper layer, as well as physical uplink signals corresponding to resource elements used by the layer physical, but do not carry information originating from a higher layer.
[036] [036] For example, physical uplink channels include a shared physical uplink channel (PUSCH), a physical uplink control channel (PUCCH), a physical random access channel (PRACH), a reference signal from demodulation (DMRS) for the uplink data / control signal and an audible reference signal (SRS) used for measuring the uplink channel.
[037] [037] In the present invention, a physical downlink control channel (PDCCH), a physical control format indicator channel (PCFICH), a hybrid automatic repeat request physical channel (PHICH) and a shared physical channel downlink (PDSCH), a physical uplink control channel (PUCCH), a physical uplink control channel (PUSCH), a physical uplink control channel (PUSCH) and a physical uplink control channel (PUSCH) ( shared uplink channel) / PRACH (physical random access channel) refers to a set of time frequency resources or a set of resource elements that carry downlink control information (DCI), control format indicator ( CFI),
[038] [038] In the following, the expression that a user device (UE) transmits PUCCH / PUSCH / PRACH is used in the same sense as to transmit uplink control information / uplink data / random access signal on PUSCH / PUCCH / PRACH, respectively. In addition, the expression that a gNode B (gNB) transmits PDCCH / PCFICH / PHICH / PDSCH is used in the same sense as to transmit control information / downlink data in PDCCH / PCFICH / PHICH / PDSCH, respectively. In the following description, an OFDM / subcarrier / RE symbol allocated with CRS / DMRS / CSI-RS / SRS / UE-RS is referred to as CRS / DMRS / CSI-RS / SRS / UE-RS / carrier / subcarrier / RE symbol . For example, an OFDM symbol to which a tracking RS is allocated or configured is referred to as a “TRS symbol”, a subcarrier to which a TRS is allocated or configured is referred to as a “TRS subcarrier”, and an RE to which a TRS is allocated or configured is called “TRS RE”. In addition, a subframe configured for TRS transmission is referred to as a “TRS subframe”. A subframe in which a transmission signal is transmitted is called a "transmission subframe" or "PBCH subframe", and a subframe in which a synchronization signal (for example, PSS and / or SSS) is called a "subframe synchronization signal ”or“ PSS / SSS subframe ”. The OFDM / subcarriers / REs symbols for which the PSS / SSS is configured or defined are referred to as “PSS / SSS symbol / subcarrier / RE”, respectively.
[039] [039] In the present invention, a CRS port, UE-RS port, CSI-RS port and TRS port are respectively configured as an antenna port configured to transmit CRS, an antenna port configured to transmit UE-RS, an antenna configured to transmit CSI-RS and an antenna port configured to transmit TRS. The antenna ports configured to transmit CRSs can be differentiated by the location of the REs occupied by the CRS according to the CRS ports, the antenna ports configured to transmit UE-RSs can be differentiated by the location of the REs occupied by the CRS. UE-RS according to the UE-RS ports, and the antenna ports configured to transmit the CSI-RSs can be differentiated by the positions of the REs occupied by the CSI-RS according to the CSI-RS ports. Therefore, the term CRS / UE-RS / CSI-RS / TRS port is also used as a term for a standard of ERs occupied by CRS / UE-RS / CSI-RS / TRS within a given resource area.
[040] [040] Figure 1 is a diagram illustrating an example of a control plan and user plan structure for a radio interface protocol between a UE and an E-UTRAN based on the 3GPP radio access network standard. . The control plane refers to a route through which the control messages used by a UE and a network are transmitted. The user plan refers to a route through which data generated at the application layer, for example, voice data or Internet packet data, is transmitted.
[041] [041] The physical layer (PHY), which is the first layer, provides an information transfer service to an upper layer using a physical channel. The physical layer is connected to the upper layer of Media Access Control (MAC) through a transmission channel (transport channel). The data moves between the MAC layer and the PHY layer over the transmission channel. Data is transferred between a transmitting side (eg, transmitting device) and a receiving side (eg, receiving device) in the physical layer through the physical channel. The physical channel uses time and frequency as radio resources. For example, the physical channel can be modulated according to Orthogonal Frequency Division Multiple Access (OFDMA) in a downlink and can be modulated according to Single Carrier Frequency Division Multiple Access (SC-FDMA) in an uplink.
[042] [042] The Media Access Control (MAC) layer of the second layer provides a service for a radio link control (RLC) layer, which is an upper layer, through a logical channel. The RLC layer of the second layer supports reliable data transmission. In some implementations, the RLC layer function can be implemented as a functional block in the MAC. The Packet Data Convergence Protocol (PDCP) layer of the second layer performs a header compression function to reduce the amount of control information and efficiently transmit IP packets, such as IPv4 and IPv6 packets, over a wireless interface with narrow bandwidth.
[043] [043] The Radio Resource Control (RRC) layer located at the bottom of the third layer is, in some implementations, defined only in the control plane. The RRC layer is responsible for the control of logical channels, transmission channels and physical channels in connection with the configuration, reconfiguration and release of radio bearers. A "radio bearer" refers to a service provided by the second layer for transmitting data between a UE and a network. To this end, the terminal and the RRC layer of the network can exchange RRC messages with each other. If there is an RRC connection between the UE and the RRC layer of the network, the UE is in a “Connected RRC Mode” and, otherwise, the UE is in an “Idle RRC Mode”. The Non-Access Stratum (NAS) layer at the top of the RRC layer performs functions such as session management and mobility management.
[044] [044] A downlink transmission channel for transmitting data from a network to a terminal (for example, a UE) includes, for example, a BCH (Transmission Channel) for transmitting system information, a PCH (Transmission Channel) Paging) to transmit a paging message, a downlink SCH (Shared Channel) to transmit control messages and user traffic. In the case of a control or traffic message from a broadcast or downlink multicast service, these messages can be transmitted via a downlink SCH or can be transmitted via a separate multicast downlink channel (MCH). In some implementations, the uplink transmission channel for transmitting data from the UE to the network includes, for example, a RACH (Random Access Channel) to transmit an initial control message and an uplink SCH (Shared Channel) to transmit control messages or user traffic. A logical channel mapped to a transmission channel includes, for example, a Transmission Control Channel (BCCH), a Paging Control Channel (PCCH), a Common Control Channel (CCCH), a Multicast Control Channel (MCCH) and Multicast Traffic Channel (MTCH).
[045] [045] Figure 2 is a diagram showing an example of a physical channel used in a 3GPP system and a general signal transmission method using that channel.
[046] [046] When the UE is turned on or enters a cell, the UE performs an initial cell search operation, such as synchronization with the base station (BS) (S201). For this purpose, the UE receives a primary synchronization channel (P-SCH) and a secondary synchronization channel (S-SCH) from the BS, synchronizes with the BS and acquires information, such as a cell ID. The UE can then receive the physical transmission channel from the BS and acquire the transmission information in the cell. In some implementations, the UE may receive a downlink reference signal (DL RS) in the initial cell search step, to check the status of the downlink channel.
[047] [047] Upon completion of the initial cell search, the UE receives more detailed system information when receiving a Physical Downlink Control Channel (PDCCH), as well as a Physical Downlink Control Channel (PDSCH), according to information in the PDCCH (S202).
[048] [048] In some implementations, if the UEs are connecting to a base station (BS) as an initial connection, or if there is no radio resource for signal transmission, then the UE can perform a random access procedure ( RACH) for BS (steps S203 to S206). For this purpose, the UE transmits a specific sequence through a Physical Random Access Channel (PRACH) as a preamble (S203 and S205) and receives a response message to that preamble on the PDCCH and the corresponding PDSCH (S204 and S206). In containment-based RACH scenarios, a containment resolution procedure can be additionally performed.
[049] [049] The UE having performed the above procedure can then perform the reception of PDCCH / PDSCH (S207) and transmission of the uplink shared physical channel (PUSCH) / uplink control physical channel control channel (PUCCH) (S208). For example, the UE can receive downlink control (DCI) information through the PDCCH. In such scenarios, the DCI may include control information, such as resource allocation information for the UE, and the DCI formats may be different according to the purpose of use.
[050] [050] In some implementations, control information transmitted by the UE to Node B via the uplink or received from Node B by the UE includes, for example, a downlink / uplink ACK / NACK signal, a channel quality indicator ( CQI), a pre-coding matrix index (PMI), a classification indicator (RI), and the like. In some systems, for example, those compatible with the LTE 3GPP standard, the UE can transmit control information, such as CQI / PMI / RI, as described above through PUSCH and / or PUCCH.
[051] [051] Figure 3 illustrates an example of the structure of a radio frame used in NR.
[052] [052] In NR, the uplink and downlink transmission is composed of frames. The radio frame can be 10 ms long and can be defined as two 5 ms halfframes (HFs). Each half-frame can be defined as five 1-ms (SF) subframes. A subframe can be divided into one or more partitions,
[053] [053] Table 1 illustrates an example of a normal PLC, in which the number of symbols per partition, the number of partitions per frame and the number of partitions per subframe are different, according to the SCS.
[054] [054] Table 2 illustrates an example of a normal PLC, in which the number of symbols per partition, the number of partitions per frame and the number of partitions per subframe are different, according to the SCS.
[055] [055] In an NR system, OFDM (A) numerology (for example, SCS, CP length, etc.) can be defined differently among a plurality of cells for a UE. Consequently, the interval (absolute time) of a time resource (for example, SF, partition or TTI) (for convenience, TU (Time Unit)) composed of the same number of symbols can be defined differently between the merged cells .
[056] [056] Figure 4 illustrates an example of an NR frame partition structure. A partition includes a plurality of symbols in the time domain. For example, in the case of a normal PLC, a partition includes seven symbols, whereas, in the case of an extended PLC, a partition includes six symbols.
[057] [057] A carrier wave includes a plurality of subcarriers in the frequency domain. A RB (resource block) is defined as a plurality (for example, 12) of consecutive subcarriers in the frequency domain. A BWP (part of bandwidth) is defined as a plurality of consecutive RBs (or physical RBs) in the frequency domain and can correspond to a numerology (for example, an SCS, a CP length, etc.). Each carrier can include up to N (for example, 5) BWPs.
[058] [058] In some implementations, data communication is performed through an activated BWP and only one BWP can be activated for an UE. In a resource grid representation, each element of the resource grid is called a Resource Element (RE), to which a complex symbol can be mapped.
[059] [059] Figure 5 illustrates an example of the structure of an independent partition.
[060] [060] A resource area (hereinafter referred to as the data area) between the DL control area and the UL control area can be used for DL data transmission or UL data transmission. For example, the following configuration can be implemented. Each section is listed in chronological order.
[061] [061] The PDCCH can be transmitted in the DL control region, and the PDSCH can be transmitted in the DL data region. Similarly, in the UL control region, PUCCH can be transmitted and, in the UL data region, PUSCH can be transmitted. The PDCCH can transmit downlink control (DCI) information, such as, for example, DL data programming information, UL data programming information and the like. The PUCCH can transmit uplink control (UCI) information, such as, for example, ACK / NACK information, CSI DL and Programming Request (SR) information, and the like.
[062] [062] The GP provides a time interval in the process of switching from a transmission mode to a receiving mode, or switching from the receiving mode to the transmission mode. A part of the symbols within a subframe can be defined as GP to switch from DL to UL.
[063] [063] In some implementations, an NR system can use a high frequency band, for example, a millimeter frequency band of 6 GHz or more, in order to transmit data, while maintaining a high data rate for a large number of users in a broad frequency band. However, in these scenarios, the millimeter frequency band can have a frequency characteristic in which the signal attenuation due to distance is very pronounced due to the high frequency nature of the band. Therefore, to compensate for these sudden attenuation characteristics, an NR system that uses at least a 6-band
[064] [064] In the millimeter frequency band, that is, in the millimeter wave band (mmW), the wavelengths are typically reduced, and this allows a plurality of antenna elements to be installed in the same area. For example, in a 30 GHz band with a wavelength of about 1 cm, a total of 100 antenna elements can be installed on a 5 x 5 cm panel in a two-dimensional array at 0.5 lambda intervals (length wave). Therefore, in mmW, the coverage or throughput can be increased by increasing the beam formation gain through a plurality of antenna elements.
[065] [065] In some implementations, as a technique to form a narrow beam in the millimeter frequency band, the beam formation can be implemented, in which the energy is only elevated in a specific direction, transmitting the same signal using a difference appropriate for a large number of antennas on a base station or UE. Such beam formation schemes include (i) digital beam formation that creates a phase difference in a digital baseband signal, (ii) analog beam formation that creates a phase difference using a time delay (i.e. , a cyclic shift) in the modulated analog signal, and (iii) hybrid beam formation using digital beam formation and analog beam formation.
[066] [066] In scenarios where a transceiver unit (TXRU) is provided to allow the adjustment of phase and transmission power for each element of the antenna, then an independent beam formation for each frequency resource can be implemented. However, problems can arise as the TXRU may not be cost effective in terms of installing multiple antenna elements of 100 or more. For example, a millimeter frequency band may require a large number of antennas to compensate for sudden attenuation characteristics. In such scenarios, digital beam formation may require several RF components (for example, a digital-to-analog converter (DAC)), mixers, power amplifiers, linear amplifiers and the like, in a number that is the number of antennas. Thus, the formation of digital beam in the millimeter frequency band can face problems in the sense that the price of communication devices may increase.
[067] [067] Therefore, when a large number of antennas are required, such as in the millimeter frequency band, implementations can use analog beam formation or hybrid beam formation. In the analog beamforming scheme, a plurality of antenna elements are mapped to a TXRU and the direction of a beam is adjusted by an analog phase shifter. In some scenarios, this analog beam formation scheme may have a disadvantage, as it can generate only one beam direction across the entire band and may not be able to perform frequency selective beam formation (BF). Hybrid BF is an intermediate form of digital BF and analog BF, and has a number (for example, B) of TXRUs that is less than the number (for example, Q) of antenna elements. In the case of hybrid BF, the number of beams that can be transmitted at the same time may be limited to B or less, although the scenarios may vary depending on the method of connecting the B TXRUs and Q antenna elements.
[068] [068] As mentioned above, since the digital beamform performs signal processing on a digital baseband signal to be transmitted or received, it is possible to transmit or receive signals in several directions simultaneously using multiple bundles. On the other hand, since the analog beam formation performs beam formation in the modulated state of an analog signal to be transmitted or received, it cannot transmit or receive signals simultaneously in a plurality of directions beyond the range covered by a beam.
[069] [069] In general, a base station communicates with a plurality of users (UEs) at the same time using a broadband transmission or a multi-antenna feature. When a base station uses analog or hybrid beam formation and forms an analog beam in a beam direction, the base station may be able to communicate only with users included in the same analog beam direction due to the characteristics analog beam formation.
[070] [070] The implementations disclosed in this document provide allocation of RACH resources and resource utilization for a base station that can, in some scenarios, mitigate these constraint inconsistencies caused by analog beam formation or hybrid beam formation characteristics.
[071] [071] Figure 6 illustrates an example of a hybrid beam-forming structure in terms of a transceiver unit (TXRU) and a physical antenna.
[072] [072] In scenarios where multiple antennas are used, a hybrid beam formation technique, which combines digital beam formation and analog beam formation, can be implemented. In analog beam formation (or RF beam formation), a transceiver (or an RF unit) performs pre-coding (or combination). In hybrid beam formation, a baseband unit and a transceiver (or RF unit) perform pre-coding (or combination), respectively. This can have the advantage of obtaining a performance close to the formation of a digital beam, while reducing the number of RF chains and the number of D / A (or A / D) converters.
[073] [073] For convenience, the hybrid beamforming structure can be represented by physical N antennas TXRUs and M. The digital beamform for L data layers to be transmitted at the transmission end can be represented by a matrix N by L. The converted N digital signals can then be converted to analog signals by means of a TXRU and then the analog beam formation represented by an M by N matrix is applied.
[074] [074] In the example in Figure 6, the number of digital beams is L and the number of analog beams is N. In addition, in an NR system, a base station can be configured to change the analog beam formation in units of symbols and thus provide more efficient beam formation for UEs located in a specific region. In addition, when the N TXRU and M RF antennas are defined as an antenna panel, a plurality of antenna panels can be implemented, to which independent hybrid beam formation is applicable in the NR system. When a base station uses a plurality of analog beams, an analog beam that is advantageous for signal reception may be different for each UE. Therefore, in some scenarios, such as for a synchronous signal, system information, paging, etc., a beam scan operation can be implemented, in which a base station changes several analog beams on a symbol-by-symbol basis to a specific partition or subframe, to provide reception opportunities for multiple UEs.
[075] [075] Figure 7 is a diagram illustrating an example of a beam scan operation for a synchronization signal and system information in a downlink transmission process;
[076] [076] In the example in Figure 7, a physical resource or a physical channel through which the system information of the NewRAT system is transmitted is referred to as xPBCH (physical transmission channel). In some implementations, analog beams belonging to different antenna panels can be transmitted simultaneously within a symbol. In order to measure the channel for each analog beam, as shown in Figure 7, implementations can use a Beam Reference Signal (BRS), which is a reference signal that is transmitted to a single corresponding analog beam. In some scenarios, a BRS can be defined for a plurality of antenna ports, and each BRS antenna port can correspond to a single analog beam. In some implementations, unlike BRS, the synchronization signal or xPBCH can be transmitted to all analog beams included in the group of analog beams, so that any UE can receive it well.
[077] [077] Figure 8 illustrates an example of a cell in a new radio access technology (NR) system.
[078] [078] Referring to the example in Figure 8, in some scenarios, an NR system can implement a plurality of TRPs that constitute a cell, unlike a scenario where a base station forms a cell in a communication system wireless. In scenarios where a plurality of TRPs constitute a cell, even if the TRP to serve the UE is changed, there may be an advantage that continuous communication can be provided and the mobility management of the UE can be facilitated.
[079] [079] On some systems, for example, systems that are compatible with LTE / LTE-A, PSS / SSS can be transmitted in an omnidirectional direction. In some implementations, a gNB that applies a millimeter wave beam forms a signal, such as a PSS / SSS / PBCH, while rotating the beam direction in an omnidirectional manner. The transmission / reception of signals when rotating the beam direction is referred to as "beam scan" or "beam scan". In the present invention, beam scanning refers to the behavior on the transmitter side and beam scanning refers to the behavior on the receiver side.
[080] [080] For example, assuming that gNB can have at most N beam directions, gNB can transmit signals (for example, PSS / SSS / PBCH) through N beam directions, respectively. In other words, gNB can transmit synchronization signals (for example, PSS / SSS / PBCH) to each direction while scanning the directions that gNB can implement or support. Alternatively, if gNB can form N beams, then several beams can be grouped into a group of beams, and the PSS / SSS / PBCH can be transmitted and / or received for each group of beams. Each bundle group can include one or more bundles.
[081] [081] A signal (for example, PSS / SSS / PBCH) that is transmitted in the same direction can be defined as an SS block, and a plurality of SS blocks can be implemented in a cell. In scenarios where there are a plurality of SS blocks, an SS block index can be used to distinguish each SS block. For example, when a PSS / SSS / PBCH is transmitted in 10 beam directions in a system, then a PSS / SSS / PBCH in the same direction can constitute an SS block.
[082] [082] In some implementations, an NR system can support a bandwidth per carrier of up to 400 MHz per carrier. If a UE operating on a broadband carrier always operates with the radio frequency module activated for the entire carrier wave, the UE's battery consumption may increase. In addition, different usage scenarios (eg, eMBB, URLLC, mMTC, V2X etc.) operating on a single broadband carrier, different amplitudes (eg sub carrier spacing) can be supported for each frequency band - coia within the corresponding carrier. In addition, the capacity for the maximum bandwidth per EU may be different.
[083] [083] Considering these factors, a base station can instruct a UE to operate only on a portion of the bandwidth, rather than on the entire bandwidth of the broadband carrier. The corresponding bandwidth on which the UE is instructed to operate is referred to as a “part of bandwidth” (BWP). In the frequency domain, BWP is a subset of contiguous common resource blocks
[084] [084] In some implementations, a base station can configure one or more BWPs on a carrier wave configured for a UE. Alternatively, some UEs can be moved to another BWP for load balancing when multiple UEs overload a specific BWP. Alternatively, inter-cell interference cancellation in the frequency domain between adjacent cells can be considered, and the BWPs on both sides of the cell can be configured on the same partition, excluding some of the spectra of the entire bandwidth.
[085] [085] For example, the base station can configure at least one DL / UL BWP for a UE associated with a broadband carrier and activate at least one DL / UL BWP between the DL / UL BWPs defined at a specific point in the time.
[086] [086] In some implementations, the DCI 1_1 format or the DCI 0_1 format can be used by the base station to instruct the UE to switch to another configured DL / UL BWP. The activated BWP DL / UL can be specifically referred to as “Active BWP DL / UL”. If the UE is in an initial access procedure or has not yet configured an RRC connection, the UE may not receive the configuration from the BWP DL / UL. In such situations, the BWP DL / UL assumed by the UE is called the initial active BWP DL / UL.
[087] [087] As used here, the term “BWP DL” refers to a BWP to transmit / receive a downlink signal (for example, PDCCH and / or PDSCH) and the term “BWP UL” refers to a BWP to transmit / receive an uplink signal (for example, PUCCH and / or PUSCH).
[088] [088] The HARQ-ACK operation in relation to the UE operation for reporting control information will be described below. The HARQ-ACK is information that indicates whether the UE has successfully received a physical downlink channel. If the UE successfully receives the physical downlink channel, then the UE sends a confirmation feedback (ACK) to the base station. If the UE does not successfully receive the physical downlink channel, then the UE sends a negative acknowledgment feedback (NACK) to the base station. HARQ in NR supports one HARQ-ACK feedback bit per transport block.
[089] [089] Figure 9 is a diagram showing an example of HARQ-ACK timing.
[090] [090] In the example in Figure 9, K0 indicates the number of partitions starting from the partition with the PDCCH carrying the DL allocation (ie, the DL grant) to the partition having the corresponding PDSCH transmission. K1 indicates the number of partitions starting from the PDSCH partition to the corresponding HARQ-ACK transmission partition. K2 indicates the number of partitions starting from the partition having the PDCCH (carrying the UL grant) to the partition having the corresponding PUSCH transmission. That is, K0, K1 and K2 can be summarized as shown in Table 3 below.
[091] [091] The base station can provide the UE with the HARQ-ACK feedback time dynamically in DCI or semi-statically via RRC signaling.
[092] [092] In some implementations, for example, systems that are compatible with NR, different minimum HARQ processing times can be supported between UEs. The HARQ processing time includes the delay between the DL data reception time and the corresponding HARQ-ACK transmission time and the delay between the UL grant reception time and the UL data transmission time. corresponding. The UE transmits information about the capacity of its minimum HARQ processing time to the base station. From the UE point of view, HARQ ACK / NACK feedback for multiple DL transmissions in the time domain can be transmitted in a UL data / control domain. The time between receipt of DL data and the corresponding ACK is indicated by the DCI.
[093] [093] Unlike some systems (for example, some LTE-compatible systems) in which the HARQ process is performed for each transport block or code word, the implementations disclosed in this document (which may be compatible with NR) support transmission based on code block groups with multibit / single bit HARQ-ACK feedback. The transport block can be mapped to one or more CBs, depending on the size of the TB. For example, in the channel encoding process, a CRC code is attached to the TB. If the TB with the CRC is not larger than the predetermined size, the TB with the CRC corresponds to a block of code. If the TB with the CRC is larger than the predetermined size, the TB will be segmented into a plurality of CBs. In the NR system, the UE can be configured to receive CBG-based transmissions, and retransmission can be programmed to transport a subset of all TB's CBs.
[094] [094] In some systems, such as those compatible with LTE, a transport block (TB) based HARQ process is supported. On systems that are compatible with NR, a CBG-based HARQ process is supported with a TB-based HARQ process.
[095] [095] Figure 10 illustrates an example of TB processing and structure.
[096] [096] Referring to the example in Figure 10, the transmitter performs a CRC (for example, 24 bits) (TB CRC) to check for errors in the TB. Then, the transmitter can divide the TB + CRC into a plurality of code blocks, considering the size of the channel encoder. In one example, the maximum size of a code block in LTE is 6144 bits. Therefore, if the size of the TB is 6144 bits or less, the code block is not formed. If the size of the TB is greater than 6144 bits, the TB is divided into units of 6144 bits to constitute a plurality of code blocks. In each code block, a CRC (for example, 24 bits) (CB CRC) is added separately for error checking. Each code block is encoded by channel and with corresponding rate and then combines to form a code word. In the TB-based HARQ process, data programming and the HARQ process are performed on the basis of TB, and the CB CRC is used to determine the early termination of TB decoding.
[097] [097] Figure 11 illustrates an example of a CBG based HARQ process. In the CBG-based HARQ process, data programming and the HARQ process can be performed in TB units.
[098] [098] Referring to the example in Figure 11, a UE can receive, from a base station (for example, Node B), information about an M number of code block groups per transport block, and this information can be received via an upper layer signal (for example, RRC signal) (S1102). After the
[099] [099] Based on whether the UE received the data correctly, the UE can provide, as feedback, CBG-based ACK / NACK information, relating to the data for the base station (S1106), and the base station. base can perform data retransmission of data in CBG units (S1108). A / N information can be transmitted via PUCCH or PUSCH. In some implementations, A / N information includes a plurality of A / N bits for data, where each A / N bit represents each A / N response that is generated for each CBG. In some scenarios, the payload size of the A / N information can be kept the same based on M, regardless of the number of CBGs that make up the data.
[0100] [0100] The NR supports a dynamic HARQ-ACK codebook scheme and a semi-static HARQ-ACK codebook scheme. The HARQ-ACK codebook (or A / N) can be replaced with a HARQ-ACK payload.
[0101] [0101] When the dynamic HARQ-ACK codebook scheme is defined, the size of the A / N payload varies depending on the number of DL data actually programmed. To that end, the PDCCH associated with DL programming includes a DAI-counter (Downlink Attribution Index) and a total-DAI. The DAI counter indicates the value of the {CC, Partition} programming order calculated in the CC (Component Carrier) (or cell) in the first way and is used to designate the position of the A / N bit within the A codebook / N. The DAI-total indicates the cumulative value of partition-by-partition programming up to the current partition and is used to determine the size of the A / N codebook.
[0102] [0102] When the semi-static A / N codebook scheme is defined, the size of the A / N codebook is fixed (at a maximum value), regardless of the actual number of programmed DL data. Specifically, the A / N (maximum) payload (size) transmitted through a PUCCH on a partition is used for all CCs configured in the UE and all DL programming partitions for which the A / N transmission time is used. can be indicated Either a combination of a PDSCH transmission partition or a PDCCH monitoring partition (hereinafter referred to as the cluster window). For example, the DL grant DCI (PDCCH) includes PDSCH timing information for A / N and the PDSCH timing information for A / N can have one of a plurality of values (for example, k ). For example, if the PDSCH is received on partition #m and the PDSCH timing information for A / N in the DL grant DCI (PDCCH) programming the PDSCH indicates k, then the A / N information for the PDSCH can be transmitted on partition # (m + k). For example, k being an element in the set {1, 2, 3, 4, 5, 6, 7, 8} can be provided. On the other hand, when the A / N information is transmitted on the #n partition, then the A / N information can include the maximum possible A / N based on the cluster window. That is, the A / N information of partition #n can include A / N corresponding to partition # (n-k). For example, if k is an element of the set {1, 2, 3, 4, 5, 6, 7, 8}, the A / N information of partition #n corresponds to the A / N information of partition # (n -8) for partition # (n-1) (that is, the maximum number of A / N). Here, the A / N information can be replaced by an A / N codebook and an A / N payload. In addition, a partition can be understood / replaced as a candidate occasion for receiving DL data. As illustrated, the grouping window is determined based on the PDSCH to A / N timing with respect to the A / N partition and the PDSCH to A / N timing set has a default value, for example, {1, 2, 3, 4, 5, 6, 7, 8} and upper layer signaling (RRC).
[0103] [0103] In the following, a method for transmitting / receiving HARQ-ACK according to an implementation of the present invention will be described in detail.
[0104] [0104] In the 5th generation NR system, the bandwidth portion (BWP) is dynamically altered and can allow energy savings and / or load balancing through the RF / baseband switching.
[0105] [0105] In addition, the HARQ-ACK codebook configuration, CSI reports and the like can be changed based on the BWP change. In particular, when carrier aggregation (CA) is applied, BWP is independent. It is necessary to define the HARQ-ACK codebook configuration and the CSI configuration method according to the change.
[0106] [0106] In the present invention, for example, when different BWPs use a semi-static HARQ-ACK code book and a dynamic HARQ-ACK code book, they use a TB-based HARQ-ACK and a HARQ-ACK based in CBG. a method of transmitting HARQ-ACK in a case where the methods of transmitting HARQ-ACK are different for each BWP will be described. In addition, a method of transmitting HARQ-ACK in the process of changing BWP by alternating BWP will be described. The implementations of the present invention are not limited to the transmission of HARQ-ACK and can be extended to other UCI transmissions, such as CSI.
[0107] [0107] Basically, the HARQ-ACK feedback transmission method in the NR system includes a semistatic HARQ-ACK codebook scheme and a dynamic HARQ-ACK codebook scheme.
[0108] [0108] In the case of the semistatic HARQ-ACK codebook scheme, taking into account all PDCCH monitoring occasions associated with a specific PUCCH transmission time, considering the plurality of PDSCH to HARQ feed-back times -ACK defined for the UE, HARQ-, the UE can process
[0109] [0109] Among the PDSCH reception occasions that can expect a PDSCH to be received on a plurality of partitions based on the PDSCH feed-back time for HARQ-ACK associated with a specific PUCCH transmission time point (ie, a HARQ-ACK transmission point in time), PDSCH reception occasions other than PDSCH reception occasions that cannot be programmed by the PDCCH between the PDSCH reception occasions, that is, opportunities PDSCH reception opportunities other than the PDSCH reception opportunity that cannot be programmed by the PDCCH, are called “candidate PDSCH reception opportunities”.
[0110] [0110] Among the occasions for receiving PDSCH candidates, occasions for receiving PDSCH candidates that are not programmed by the actual PDCCH monitoring occasions and have not received the PDSCH can be processed as NACK.
[0111] [0111] In some implementations, in the case of the dynamic HARQ-ACK codebook scheme, the total DAI field and / or the counter DAI field are defined in the DCI and generate / transmit HARQ-ACK bits to the PDSCH that it is really programmed by the PDCCH monitoring opportunities based on the corresponding DAI value.
[0112] [0112] In some implementations, when carrier aggregation is applied, the transmission of HARQ-ACK to a plurality of cells can be multiplexed to a PUCCH and transmitted.
[0113] [0113] In this case, when the semistatic HARQ-ACK codebook is used, the order of HARQ-ACK bits is the order of the PDCCH monitoring opportunities from the beginning, based on the union of the monitoring opportunities. - PDCCH of each cell. When a dynamic HARQ-ACK codebook is used, as shown in Figure 13, when a DCI that programs a PDSCH in a corresponding cell actually exists, the HARQ-HARQ-ACK can be generated based on this.
[0114] [0114] In some implementations, such as those compatible with NR, CBG-based retransmission and / or HARQ-ACK feedback can be set for each service cell and the number of HARQ-ACK bits based on CBG and / or maximum HARQ-ACK bits based on CBG can be defined for each service cell. If a semi-static HARQ-ACK codebook is used, it is necessary to generate a TB-based HARQ-ACK for each occasion of PDCCH monitoring, according to the determination of whether a CBG-based HARQ-ACK is defined for each cell or a number of CBGs and / or a maximum number of CBGs based on the HARQ-ACK bit based on CBG. In some implementations, the TB-based HARQ-ACK can be generated with 1 bit or 2 bits, according to the maximum number of TBs.
[0115] [0115] In the case of using a dynamic HARQ-ACK codebook, as shown in Figure 14, the HARQ-ACK bits are generated based on the TB-based HARQ-ACK for all service cells, in addition to the service cells for which CBG transmission is defined, the number of CBGs to be programmed for each service cell is generated based on the maximum value of the number of CBGs defined in each service cell. In some implementations, the maximum value of the number of CBGs can be twice the maximum number of TBs defined. On the other hand, in some systems (for example, systems that are compatible with NR), the downlink and uplink signals (for example, subcarrier ranges) may be different. Therefore, when determining the time between the PDSCH and the HARQ-ACK feedback, it is necessary to consider the difference in signaling for the transmission of the HARQ-ACK and the feedback for the PDSCH. Basically, K1 representing the displacement value between the PDSCH and the PUCCH to which the HARQ-ACK is transmitted is expressed based on the numerology of the PUCCH. Therefore, if the partition where the last PDSCH symbol overlaps is n, the PUCCH is transmitted in the partition corresponding to n + K1. However, if the PDSCH subcarrier range is less than the PUCCH subcarrier range, the partition based on the PUCCH subcarrier range may be different according to the time-domain (time- RA domain) of the time domain.
[0116] [0116] In this case, a set of rows from the RA domain-time tables for a plurality of feedback times from PDSCH to HARQ, in which the last PDSCH symbol in each PUCCH partition overlaps, can be defined. More specifically, the last symbol of the PDSCH can be derived from the SLIV of the RA time-domain field. In this case, the last symbol of the PDSCH can be defined as limited to the last partition of the aggregated partitions, considering the aggregation of partitions. Alternatively, the maximum value of the number of PDSCH combinations (non-overlapping PDSCH) that do not overlap between the PDSCHs can be set.
[0117] [0117] On the other hand, if the PDSCH subcarrier range is greater than the PUCCH subcarrier range, a plurality of partitions for the PDSCH can overlap a partition based on the PUCCH subcarrier range. In this case, the HARQ-ACK codebook can be calculated based on the maximum number of PDSCHs (non-overlapping PDSCHs) that do not overlap with each partition. Specifically, a set for all PDSCH partitions that overlap with a specific PUCCH partition is defined, a maximum value for the number of PDSCH combinations (non-overlapping PDSCH) that is not overlapping for each PDSCH partition is defined and added and another PDSCH feedback time for HARQ can be applied repeatedly. In this case, considering the aggregation of partitions, the implementation can be applied only to the last partition of the aggregated partition.
[0118] [0118] By integrating the methods mentioned above, the following implementations can be derived. For example, if PUCCH is transmitted on PUCCH partition n, it can constitute a set of combinations of SLIV and PDSCH partitions for all PDSCHs in which the last symbol overlaps the PUCCH n-k partition (where k are all values included in K1). In some implementations, if partition aggregation is defined, the last symbol can be the last symbol corresponding to the last partition between the aggregated partitions. The combination of SLIV and PDSCH partitions, including uplink symbols in the set for combining SLIV and / or PDSCH partitions for all PDSCHs on which the last symbol overlaps, can be excluded from the corresponding set. If the PDCCH monitoring occasion corresponding to the combination of SLIV and PDSCH partitions is not defined, the combination of corresponding SLIV and PDSCH partitions can be excluded from the corresponding set. The maximum number of non-overlapping PDSCH combinations can be derived by applying an algorithm to locate non-overlapping PDSCHs within the given set, by performing the procedure described above. At that time, the maximum number of combinations can be derived for each PDSCH partition and, if partition aggregation is used, the derivation method can be modified.
[0119] [0119] On the other hand, the occasion for monitoring PDCCH may be different for each DCI format. For example, the PDCCH monitoring occasion of the DCI 1_0 format may consist of a subset of PDCCH monitoring occasions of the DCI 1_1 format. In this case, the time-domain resource allocation set may differ according to the DCI format.
[0120] [0120] Therefore, the HARQ-ACK codebook configuration scheme may differ according to the DCI format. For example, if only the DCI 1_1 format is considered for the occasion of PDCCH monitoring, then the HARQ-ACK codebook can be configured based on the time table lines-
[0121] [0121] For example, a set of rows from the PDSCH RA time-domain table and a DCI format pair (format pair) can be defined. For example, when the availability of PDCCH is determined for each line, the occasion for monitoring PDCCH of the DCI format paired with the corresponding line can be checked to define the corresponding set. That is, the DCI format PDCCH monitoring occasions are confirmed based on the K0 offset value between the partitions to receive the PDSCH of the partition on which the DCI is received when checking each row of the RA domain-time table. If there is an occasion for PDCCH monitoring at this point in time, it can be considered when building a HARQ-ACK codebook and, otherwise, it can be excluded from the HARQ-ACK codebook configuration.
[0122] [0122] On the other hand, the UE can perform PDCCH monitoring only within the currently active BWP DL. In some implementations, CORESET and / or the search space can be independently configured for each BWP. The research space may include monitoring occasions on the time axis for the PDCCH.
[0123] [0123] However, if the PDCCH monitoring occasions differ according to the BWP, the HARQ-ACK codebook setting can also be changed dynamically. In addition, the PDSCH feedback time value range for HARQ-ACK can be set independently for each BWP, and the HARQ-ACK codebook setting can be changed even in this case.
[0124] [0124] When the BWP is changed, an interval in which the ledger setting
[0125] [0125] In some implementations, the bits that configure the HARQ-ACK code-book size or the HARQ-ACK code-book can be changed in various ways according to the circumstances. For example, a set of PDSCH times for HARQ-ACK is defined in {4, 5, 6, 7} partitions in BWP # (defined time) is defined in {4, 6} partitions.
[0126] [0126] For example, when transmitting feedback from HARQ-ACK on partition n, it is assumed to operate on BWP # 1 up to partition n-4 and operate as BWP # 2 on partition n-4. In this case, the UE may be ambiguous as to the transmission of a 4-bit HARQ-ACK for n-7, n-6, n-5 and n-4 partitions and / or a 2-bit HARQ-ACK for partitions n-6 and n-4 in partition n. In particular, considering the situation of the CA, the general configuration of the HARQ-ACK codebook may need to be changed as the size of the HARQ-ACK changes. However, the PDSCH to HARQ-ACK time aggregation ratio according to the assumption above can be extended by combining according to the PDCCH to PDSCH timing.
[0127] [0127] Now, more specific implementations of a HARQ-ACK codebook construction method according to BWP switching will be described.
[0128] [0128] First, the operating procedure of the UE, the BS and the network according to the implementation of the present invention will be described with reference to Figures 15 to 17.
[0129] [0129] FIG. 15 is a flow chart illustrating an example of an UE operation in accordance with an implementation of the present invention. Referring to Figure 15, the UE can receive a plurality of BWPs to receive a downlink signal from a base station (S1501). In some implementations, the plurality of BWPs can be configured through the upper layer signaling. Then, the UE receives, from the base station, DCI and / or upper layer signaling to activate the first BWP among the plurality of BWPs (S1503), and receives the first PDSCH through the first activated BWP (S1505). Subsequently, the UE receives, from the base station, DCI to change the active BWP from the first BWP to the second BWP (S1507), and receives the second PDSCH through the second active BWP (S1509).
[0130] [0130] The UE then transmits HARQ-ACK to at least one of (i) the first PDSCH received via the BWP prior to the change or (ii) the second PDSCH received via the changed BWP (S1511). In some implementations, the HARQ-ACK configuration method and a transmission method can be performed according to implementations 1 to 4, described below.
[0131] [0131] With reference to Figure 16, an example of a base station operation according to an implementation of the present invention will be described.
[0132] [0132] The base station receives from the UE a HARQ-ACK for at least one of (i) the first PDSCH transmitted through the BWP before the change, or (ii) the second PDSCH transmitted through the changed BWP (S1611) . In some implementations, the HARQ-ACK is configured and a receiving method according to the first to fourth implementations to be described below.
[0133] [0133] Considering the operations of Figures 15 and 16 from the network perspective in Figure 17, the base station configures a plurality of BWPs for transmitting the downlink signal to the UE through upper layer signaling (S1701), transmitting the BWPs the plurality of BWPs and transmit the DCI and / or upper layer signaling to activate the first BWP for the UE (S1703). The base station then transmits the first PDSCH via the first activated BWP (S1705).
[0134] [0134] The UE transmits, to the base station, HARQ-ACK to at least one of (i) the first PDSCH that was transmitted through the BWP before the BWP change, or (ii) the second PDSCH that was transmitted through the BWP BWP after the BWP change (S1711). In some implementations, the UE configures HARQ-ACK and a receiving method according to the first to fourth implementations to be described below.
[0135] [0135] When using a semistatic HARQ-ACK codebook, a UE does not wait for the BWP to change. Alternatively, the UE can expect that the set of PDCCH monitoring occasions or the DL association set associated with HARQ-ACK feedback will not be changed, even if the BWP is changed.
[0136] [0136] In some scenarios, in the case of the first implementation, it is possible to avoid or expect not to change the HARQ-ACK codebook configuration, even if the BWP is changed.
[0137] [0137] When a plurality of BWPs are configured, the UE determines whether the HARQ-ACK bits are generated based on a combination of downlink association sets or PDCCH monitoring occasions for all BWPs configured for each cell . Specifically, when a semi-static HARQ-ACK codebook is used, the HARQ-ACK bits can be generated for each PDCCH monitoring occasion for all configured BWPs or for each PDCCH monitoring occasion when joining sets down link association. In this case, the number of bits of HARQ-ACK can be one or two bits, depending on the number of TBs.
[0138] [0138] On the other hand, when the dynamic HARQ-ACK codebook is used, the HARQ-ACK bits can be generated according to the PDSCH schedule based on the combination of the PDCCH monitoring occasions or the association downlink definition defined for all configured BWPs.
[0139] [0139] In the second implementation, the number of HARQ-ACK bits can be increased. In particular, in the semi-static HARQ-ACK codebook, the number of HARQ-ACK bits can be excessively large. However, even when the BWP is dynamically changed and the PDCCH monitoring occasion, the PDCCH to PDSCH timing and / or the PDSCH to HARQ-ACK feedback time are dynamically changed, the HARQ-ACK setting does not change dynamically. is changed.
[0140] [0140] The UE can generate bits of HARQ-ACK based on the active BWP, that is, active BWP (downlink), at the point in time of the corresponding HARQ-ACK feedback transmission. Alternatively, the HARQ-ACK bits can be generated based on the BWP (downlink) corresponding to the PDSCH closest to the point of view among the PDSCHs associated with the HARQ-ACK feedback.
[0141] [0141] Specifically, in the case of a single cell, the HARQ-ACK for the
[0142] [0142] On the other hand, in the CA situation, the order between the HARQ-ACK bits for a plurality of service cells can be rearranged, so that the encoding for the HARQ-ACK feedback may need to be performed again.
[0143] [0143] However, this problem can be avoided by defining the interval at which the BWP is changed to be long enough and by not executing new programming (downlink) within the interval. Or it can be expected that the HARQ-ACK feedback for programming (downlink) that occurs in the interval between the BWP switching, that is, in the BWP switching, will be programmed to match the BWP before the change or match the BWP after the change.
[0144] [0144] In the case of the third implementation, the HARQ-ACK feedback detection performance can be improved by generating as many HARQ-ACK bits as needed. In particular, in the case of the semi-static HARQ-ACK codebook, it is possible to generate as many HARQ-ACK bits as needed.
[0145] [0145] Specifically, in the case of semi-static HARQ-ACK codebook, when generating the number of HARQ-ACK bits, the HARQ-ACK bit associated with the PDCCH monitoring occasions for the BWP before the change is not generated , only the HARQ-ACK bits associated with the PDCCH monitoring occasions can be generated. That is, the number of HARQ-ACK bits is a number of candidate PDSCH opportunities that can expect PDSCH reception on a plurality of partitions according to the PDSCH to HARQ feedback time related to the HARQ- ACK and generate HARQ -ACK bits as many as the number of candidate PDSCH opportunities associated with the changed BWP.
[0146] [0146] In other words, the number of HARQ-ACK bits after the BWP switch is performed may be less than the number of HARQ-ACK bits when the BWP switch is not performed. However, after a certain period of time since performing the BWP switchover, all candidate PDSCH opportunities related to HARQ-ACK feedback may be present on the partitions after the BWP change. As time passes after the BWP change, the number of ACK bits may gradually increase. In other words, the bits for candidate PDSCH opportunities associated with the pre-change BWP that are discarded in the HARQ-ACK bits are not included.
[0147] [0147] When the UE determines that all downlink BWPs indicated by the PDCCH by programming PDSCH in the downlink association set corresponding to the HARQ-ACK feedback are all the same or when the set of PDCCH monitoring occasions or HARQ feedback -ACK is used, the UE determines that the downlink association set is the same.
[0148] [0148] For example, the downlink association set for HARQ-ACK feedback at one point can correspond to only one specific BWP for each cell. Different HARQ-ACK feedback can be performed in different Orthogonal Cover Code (OCC) and frequency / symbol regions when the HARQ-ACK feedback is divided into the ACK / NACK feature indicator (ARI). For each different HARQ-ACK feedback, the BWPs associated with the downlink association set can be configured individually.
[0149] [0149] In this case, a fallback operation can be implemented within the BWP toggle period. For example, in some implementations (for example, in an NR system), the UE receives only one disaster recovery DCI, just like the DCI format 1_0, and when the received DAI value from the disaster recovery DCI is 1, it can transmit only bits of HARQ-ACK to the corresponding DCI.
[0150] [0150] In some implementations, the disaster recovery DCI can be transmitted in a common research space. In addition, when the UE detects PDCCH and / or PDSCH on the first partition or on the first occasions of PDCCH monitoring in the downlink association set associated with HARQ-ACK in the NR system, the UE can transmit only bits of HARQ-ACK for the corresponding PDSCH.
[0151] [0151] Alternatively, the alternation of BWP can be directed to the DCI for non-failure recovery, so that if the UE detects only one DCI with DAI = 1, then, regardless of the DCI format, it can transmit only bits of HARQ-ACK for that PDSCH. In this case, the DCI with DAI = 1 can be a DCI by programming the corresponding PDSCH. Specifically, even if only one DCI with DAI = 1 is transmitted in SCell, that is, DCI with DAI = 1 is not transmitted in another cell, the HARQ-ACK bits for the corresponding PDSCH can be transmitted.
[0152] [0152] However, in the case of using the semi-static HARQ-ACK codebook, there may be no DAI field for non-failure recovery and therefore the PDSCH is programmed on the first occasion of monitoring the corresponding PDCCH- corresponding to the downlink association set for HARQ-. Only when the PDCCH is detected, can the HARQ-ACK bit for the PDSCH be transmitted. That is, even if the semi-static HARQ-ACK codebook is set, the HARQ-ACK bits for all PDCCH monitoring occasions associated with HARQ-ACK feedback are not generated, but the related HARQ-ACK bits DCI-based disaster recovery operation with DAI = Can be generated.
[0153] [0153] In some implementations, the HARQ-ACK codebook generation method according to the BWP change may be different depending on whether the HARQ-ACK codebook defined in the implementation above is a codebook of Semi-static HARQ-ACK or a dynamic HARQ-ACK codebook. In addition, the implementations of the present invention need not necessarily be performed in isolation, but can be performed in combination with the implementations. That is, a plurality of methods included in the above implementations can be used in combination. For example, in an implementation of the present invention, a disaster recovery operation can always be supported.
[0154] [0154] In addition, the HARQ-ACK association set can be differentiated according to the BWP index and / or the ARI combination indicated by the DCI. For example, if some of the different BWP inter-PDCCH monitoring opportunities overlap, then based on the BWP index and / or the ARI value in the DCI transmitted in the overlap region, the UE can determine which BWP based on the downlink association set to be referred to when generating the HARQ-ACK ledger. That is, if some of the PDCCH monitoring opportunities between different BWPs overlap, then the PDCCHs corresponding to PDSCHs in a downlink association set for a specific BWP criterion may have the same BWP and / or ARI index . Specifically, the ARI value can be classified according to whether the value of the ARI field is the same or not.
[0155] [0155] Furthermore, when the PUCCH resource set to be indicated by the ARI is different for each BWP, the HARQ-ACK ledger generation and transmission operation can be performed based on the fact that the PUCCH resource finally selected to be the same.
[0156] [0156] If the BWP indices are different and the ARIs are the same, it can be considered that the HARQ-ACKs for PDSCHs corresponding to different BWPs are transmitted on the same channel. Specifically, HARQ-ACKs for PDSCHs corresponding to different BWPs can be transmitted simultaneously after HARQ-ACKs are generated for each BWP, and are transmitted simultaneously.
[0157] [0157] In some implementations of the present invention, the semistatic HARQ-ACK codebook or the dynamic HARQ-ACK codebook can be UE specific, regardless of BWP, and when the codebook type is defined for each BWP, they can all have the same configuration.
[0158] [0158] In some implementations (for example, NR-compatible systems), the HARQ-ACK codebook configuration method can be changed by means of upper layer signaling. In such scenarios, there may be a need to operate unambiguously between the UE and gNB during the RRC restart period. In this case, the potential ambiguity between the gNB and the UE can be mitigated by operating in the failure recovery operation mode described in the above implementations within the period.
[0159] [0159] In the HARQ-ACK code book type, the factor of a semi-static HARQ-ACK code book or of a dynamic HARQ-ACK code book can be configured or cannot be changed according to Downlink BWP and / or uplink BWP. For example, a semi-static HARQ-ACK codebook can be useful when the size of the downlink association set for HARQ-ACK feedback differs according to the downlink BWP and, conversely, a HARQ codebook - Dynamic ACK can be useful.
[0160] [0160] For example, if the DL association set is large, the size of the HARQ-ACK codebook can be large, so it can be configured as a dynamic HARQ-ACK codebook.
[0161] [0161] On the other hand, when ambiguity can occur if a DAI-based dynamic HARQ-ACK codebook is used due to a change in channel quality or in the interference environment according to the downlink BWP, then a semi-static HARQ-ACK codebook can be used. In this case, as the UE dynamically changes the BWP, the HARQ-ACK codebook type can also be changed dynamically.
[0162] [0162] Since the PUCCH will be transmitted on PCcell (including PSCell or PUCCH-SCell), the type of HARQ-ACK codebook can be determined according to the PCell BWP (downlink). For example, the presence of the DAI field in the DCI at SCell can be determined based on whether the HARQ-ACK codebook configured in the PCell BWP is a dynamic HARQ-ACK codebook. However, even in this case, the disaster recovery DCI can still have a counter DAI field.
[0163] [0163] On the other hand, a DAI field can be created or deleted based on the time point at which the BWP is actually changed. The UE assumes that the downlink BWP indicated by the PDCCH in the DL association set corresponding to the corresponding HARQ-ACK feedback is the same at the HARQ-ACK feedback time point. For example, all DCIs associated with HARQ-ACK feedback can be thought of as assuming a semi-static HARQ-ACK code book or a dynamic HARQ-ACK code book. Specifically, the HARQ-ACK feedback can be divided into the BWP index and / or the ARI value in the associated DCI, and the DCIs corresponding to the same HARQ-ACK feedback channel or the same group of HARQ-ACK feedback channels may have a BWP index and / or ARI value of the same value.
[0164] [0164] On the other hand, when the interval or BWP is changed, such as when the configuration of the search space is changed, a disaster recovery operation can be performed. Here, the disaster recovery operation refers to a DCI-based operation with DAI = 1 or a DCI detection operation only on the first occasion of PDCCH monitoring of the configured cell downlink association set.
[0165] [0165] On the other hand, due to the switching of DCI-based BWP, there may be a discrepancy between the size of the required DCI field and the size of the DCI field actually transmitted in the changed BWP.
[0166] [0166] For example, as can be seen in the example in Figure 18, the DCI is received in the pre-change BWP, and the BWP is subsequently changed according to the received DCI indication. So, if DCI programs the PDSCH in the BWP (post-change) after the change, inconsistencies can occur between the number of DCI bits required depending on the BWP settings before the change and the number of DCI bits needed depending on the settings for the BWP after the change. That is, the size of the bits required for the PDSCH programming transmitted in the BWP after the change may differ from the size of the DCI bits transmitted in the BWP before the actual change.
[0167] [0167] In this case, the bit field for the relevant configuration contained in the DCI field can be filled in with zero or truncated before interpreting the information contained in the DCI, depending on the relevant configuration in which inconsistencies may occur. That is, when the UE interprets the DCI, it can interpret the DCI assuming that the bit field for the relevant configuration is filled with zero or truncated.
[0168] [0168] If the bit field size required for the changed BWP is less than or equal to the bit field size of the actually transmitted DCI, the DCI can represent all possible values of the corresponding bit field, so that the constraint of programming due to the difference in field size does not occur. However, if the bit field size needed for the changed BWP is larger than the bit field size of the actually transmitted DCI, the DCI cannot point to some bit field value needed for the changed BWP and therefore , you can limit the PDSCH schedule.
[0169] [0169] Therefore, according to some implementations of the present invention, UE DCI analysis techniques will be described, which can address incompatibilities that occur between the size of the DCI required to program the PDSCH due to the BWP change and the size of the DCI actually transmitted.
[0170] [0170] Before explaining the analysis techniques for each DCI format, the operation in terms of UE, base station and network according to the implementation of the present invention will be described with reference to Figures 19 to 21, below.
[0171] [0171] Figure 19 shows an example of an operating procedure according to the present invention from a UE perspective. Referring to the example in Figure 19, the UE receives (S1901) a DCI including the first information to change an active BWP from a first BWP to a second BWP, and transmits the DCI included in the DCI based on the settings of the second information related to BWP's PDSCH programming (S1903). In some implementations, the bits included in the DCI can be generated based on the configuration for the first BWP.
[0172] [0172] If the UE obtains the PDSCH programming information through the DCI analysis received in accordance with the implementations described below, the PDSCH can be received on the second BWP based on the obtained PDSCH programming information (S1905) .
[0173] [0173] Figure 20 is a diagram showing an example of a base station operation procedure according to an implementation of the present invention. With reference to Figure 20, BS can transmit to a UE a
[0174] [0174] Therefore, according to some implementations disclosed in this document, techniques are disclosed to deal with each bit field in view of such inconsistency. However, if the bit size required for the second BWP is larger than the size of the DCI actually transmitted, the BS can program the PDSCH in the second BWP taking this into account. For example, the base station can consider the ambiguity of the DCI size that can occur due to inconsistency between the configuration for the first BWP and the configuration for the second BWP, and can program the PDSCH in the second BWP within a range which can be represented by the bit size of the DCI actually transmitted. The BS can transmit the PDSCH in the second BWP based on the DCI (S2003).
[0175] [0175] Referring to the example in Figure 21, a base station can transmit, to a UE, a DCI including first information to change an active BWP from a first BWP to a second BWP (S2101). In some implementations, the DCI may include various information to program the PDSCH, in addition to the first information to change the active BWP. In this case, although the PDSCH can be programmed to be transmitted on the second BWP, the criteria for generating DCI can be based on the configuration for the first BWP. For example, the DCI bit size can be determined based on the configuration for the first BWP and may be inconsistent with the bit size required by the UE in order to actually program the transmitted PDSCH from the second BWP.
[0176] [0176] Therefore, according to some implementations disclosed in this document, techniques are disclosed to deal with each field of bits in view of such inconsistency. However, if the bit size required for the second BWP is larger than the size of the DCI actually transmitted, then the BS can program the PDSCH in the second BWP taking this into account. For example, the base station can consider the ambiguity of the DCI size that can occur due to inconsistency between the configuration for the first BWP and the configuration for the second BWP, and can program the PDSCH in the second BWP within a range that can be represented by the bit size of the DCI actually transmitted.
[0177] [0177] In some implementations, the UE that receives the DCI analyzes and acquires information related to the PDSCH programming included in the DCI based on the configuration for the second BWP (S2103). In some implementations, the bits included in the DCI can be generated based on the configuration for the first BWP.
[0178] [0178] In some implementations, the BS can transmit the PDSCH in the second BWP based on the DCI (S2105).
[0179] [0179] Now, a description of an example of techniques that address scenarios in which there is an incompatibility between the bit size of the DCI required for the changed BWP and the bit size of the DCI actually transmitted for each DCI format for programming will be provided. of the PDSCH.
[0180] [0180] Table 4 presents an example of fields of the DCI 0_1 format that are filled with zero or truncated before analyzing the DCI, due to the BWP change.
[0181] [0181] Referring to Table 4, when analyzing the DCI field included in the DCI format 0_1 according to the BWP change, when filling in zero in a bit field for allocation of resources in the frequency domain - cia / tempo, programming flexibility may be limited. However, the complexity of the system can be reduced. In addition, when performing frequency hopping, filling in zero can correspond to the non-frequency hop being used for PUSCH transmission. On the other hand, since the Audible Reference Signal (SRS) is transmitted after changing the active BWP UL (Uplink), gNB programs the DCI 0_1 format indicating the change in BWP UL without precise information about the channel status or beam information for the new BWP to do. In addition, when the BWP change is triggered, the Transmission Configuration Indication (TCI), the Modulation and Coding Scheme (MCS) and / or the Programming Request Indicator (SRI) due to the BWP change does not can be used because the disaster recovery DCI (for example, DCI format 0_0) Indicator) may not be accurate. On the other hand, information about the new BWP may be inaccurate without taking into account the number of bits available for each DCI field.
[0182] [0182] Likewise, on an antenna port or PTRS-DMRS association, since gNB cannot accurately determine the most appropriate DMRS port to transmit PUSCH or PTRS before receiving SRS, the size of the field of bits associated with the antenna port or PTRS-DMRS is not limited. In other words, the new BWP-related antenna port or PTRS-DMRS association information may be inaccurate, regardless of the bit field size limitation, because the base station cannot accurately capture the information from association of PTRS-DMRS or antenna port to the BWP after the change.
[0183] [0183] In scenarios where the beta shift indicator is conservatively defined as the semi-static beta shift, a dynamic beta shift indicator can be used. On the other hand, one of the values that can be indicated by the beta displacement indicator may need to be conservatively defined. For example, the conservatively configured value can be indicated using a bit field index of 0.
[0184] [0184] DMRS sequence initialization can be used to support MU-MIMO (Multiple Outputs and Multiple Inputs from Multiple Users). Even though the DCI format 0_1 indicating the change in BWP UL does not have a bit field for initialization of the DMRS sequence or the initialization value of the DMRS sequence is set to 0, gNB can set the DMRS sequence of 1 to support other UEs for MU-. The DCI indicating initialization can be programmed.
[0185] [0185] To summarize the above description, no restrictions are placed on the selection of the bit fields of the DCI 0_1 format, even if a large part of the bit fields for the BWP is truncated after the change. Thus, even when the BWP is changed, the bit fields of the DCI 0_1 format can be used as is. However, regardless of the bit field size, information about some DCI fields, such as SRS resource indication, pre-coding information, number of layers, antenna port and / or PTRS- association information DMRS, may not be accurate.
[0186] [0186] Table 5 below shows an example of fields in the DCI 1_1 format that are filled in with zero or truncated before DCI analysis, due to the BWP change.
[0187] [0187] When executing padding with zero in the bit field to allocate resources in the frequency / time domain, the flexibility of programming can be limited, but the complexity of the system can be reduced. If the VRB to PRB mapping field is not filled with zero, then the VRB to PRB mapping not interleaved can be used for PDSCH transmission.
[0188] [0188] If the PRB cluster size indicator is not filled with zero, then a value of the second PRB cluster size can be used for receiving PDSCH. In some scenarios, even this may not be disadvantageous in terms of programming flexibility compared to the semistatic PRB cluster size.
[0189] [0189] The rate match indicator or ZP CSI-RS trigger can be significant only if the rate match pattern or ZP CSI-RS pattern to be indicated (by the rate match indicator or the ZP trigger CSI-RS) overlap (partially or completely) with the allocated resources that are indicated by the allocation of resources in the time / frequency domain. Therefore, even if there is a restriction in the bit field size of the rate matching indicator or the ZP CSI-RS trigger, gNB can control to avoid overlapping the resources allocated with the rate matching pattern or pattern ZP CSI-RS which cannot be indicated by the rate matching indicator or the ZP CSI-RS trigger, respectively. Thus, restricting the bit field size of the rate matching indicator or the ZP CSI-RS trigger is not problematic for the operation of the UE and the base station.
[0190] [0190] In the bit field for transport block 2, if the DCI format 1_1, indicating the change of active BWP DL can program only one transport block, but the new BWP (ie the changed BWP) supports up to two transport blocks, then, in some implementations, the second transmission block can be disabled. In other words, according to some implementations,
[0191] [0191] As a specific example, even if the 'maxNrofCo- deWordsScheduledByDCI' parameter set by the upper layers indicates that two code word transmissions are enabled, if the DCI indicating the active BWP change contains only a set of MCS bit fields, NDI and RV, then, only one transport block can be activated. For example, even if 'maxN- rofCodeWordsScheduledByDCI' is set to 2 for BWP after the top layer change, if there is only a set of MCS, NDI and RV bit fields in the DCI that indicate the change in the active BWP sent in the BWP before the change, the second transport block can be deactivated.
[0192] [0192] Here, if the second transport block is disabled, according to some implementations, the UE can detect the DCI assuming that the MCS, NDI and RV bit field sets for the second transport block in the DCI 1_1 format are transmitted with zero padding. Alternatively, the UE can ignore the MCS, NDI and RV bit field sets for the second transport block in DCI 1_1 format. In some implementations, the UE can perform both actions. That is, the UE can ignore the field set assuming that the MCS, NDI and RV bit field sets for the second transport block in the DCI 1_1 format are filled with zero.
[0193] [0193] In some implementations, DMRS sequence initialization can be used to support MU-MIMO. For example, even in scenarios where the DCI 1_1 format (indicating BWP DL switching) does not have a bit field for initializing the DMRS sequence (and therefore the value for initializing the DMRS sequence is set to 0), gNB can, however, program the DCI indicating the initialization of the DMRS sequence from 1 to another UE to support the MU-MIMO operation.
[0194] [0194] In other words, for some DCI fields (for example, antenna ports or transmission configuration indication (TCI)), regardless of the size of the bit field, the network may not know the information for the field corresponding to the BWP after switching. Consequently, even if a bit field is truncated significantly to match the new BWP after switching, there are no restrictions on the selection of bit fields for the DCI 1_1 format.
[0195] [0195] For MIMO-related parameters, since CSI-RS or SRS will be transmitted after switching BWP, gNB may not be able to perform channel estimation or beam detection on the new BWP (ie, BWP after alternation) to program the PDSCH or PUSCH. In this case, instead of using a Transmitted Pre-Coding Matrix Indicator (TPMI) indicated by DCI, antenna ports, Programming Request Indicator (SRI) or Transmission Configuration Indicator (TCI), a standard configuration can be used, as in the initial transmission before the RRC (Radio Resource Control) configuration.
[0196] [0196] As a specific example, if the PUSCH is programmed by DCI, which indicates the switching of BWP UL active, then the beam information for PUSCH transmission can reuse the same beam information as the information of the PUCCH resource having a lower index among the PUCCH resources. In addition, if the PDSCH is programmed by the DCI which indicates an active BWP DL toggle, then the beam information for the PDSCH transmission can reuse the same beam information as the Control Resource Set beam information (CORESET) having a lower index among CORESETs.
[0197] [0197] In some implementations, these operations may ignore DCI fields that are not present in the DCI disaster recovery format, so the operations behave in a manner similar to that of PDSCH / PUSCH programming, which is programmed by disaster recovery DCI. In other words, if a default setting is assumed, one can consider ignoring DCI fields that do not exist in the Disaster Recovery DCI format, in order to simplify the DCI that drives the BWP change.
[0198] [0198] For example, consider a scenario in which the DCI schedules a PDSCH transmission in a post-alternation BWP and where this DCI indicates the alternation of BWP. In these scenarios, the Quasi Colocation (QCL) information, spatial relationship information or Transmission Configuration Indication (TCI) information can be considered equal to that of the lowest index CORESET.
[0199] [0199] For example, after a change in BWP by DCI indicating the change in BWP, the QCL information, spatial relation information or TCI information for the PDSCH transmission programmed in the BWP may be the same as the QCL information , spatial relation information or the TCI Information that is configured for the CORESET associated with the DCI, indicating the change in the BWP.
[0200] [0200] Likewise, in the PUSCH transmission that is programmed by the DCI indicating the alternation of BWP, it can be assumed that the QCL information, the spatial relation information or the SRS resource indicator information are the same as that of the PUCCH of the lowest index or the same as the QCL Information, spatial relation information or SRS resource indicator information for an Msg3 in the new BWP (post-toggle). Specifically, the techniques described above can be applied collectively to DCI to change the BWP.
[0201] [0201] In some implementations, changing the DCI-based BWP can occur flexibly and, in some cases, operations based on the standard configuration can be performed only for a specific combination of MIMO-related parameters in order to to use the MIMO parameter value based on DCI indication. For example, when the parameters related to MIMO are all set to 0, the operation according to the standard configuration can be performed.
[0202] [0202] Figure 22 shows an example of a radio communication device according to an implementation of the present invention.
[0203] [0203] The wireless communication apparatus illustrated in Figure 22 can represent a terminal and / or a base station according to an implementation of the present invention. However, the wireless communication device in Figure 22 is not necessarily limited to the terminal and / or the base station according to the present invention and can implement various types of devices, such as a communication system or device in vehicle, wearable device, laptop etc.
[0204] [0204] In the example of Figure 22, a terminal and / or a base station according to an implementation of the present invention includes at least one processor 10, such as a digital signal processor or a microprocessor, a transceiver 35, a power management module 5, an antenna 40, a battery 55, a screen 15, a keyboard 20, at least one memory 30, a subscriber identity module (SIM) card 25, a speaker 45 and a microphone 50, and the like. In addition, the terminal and / or the base station may include a single antenna or multiple antennas. Transceiver 35 can also be referred to as an RF module.
[0205] [0205] The at least one processor 10 can be configured to implement the functions, procedures and / or methods described in Figures 1 to 21. In at least some of the implementations described in Figures 1 to 21, the at least one processor 10 it can implement one or more protocols, such as layers of the overhead interface protocol (for example, functional layers).
[0206] [0206] At least one memory 30 is connected to at least one processor 10 and stores information related to the operation of at least one processor 10. The at least one memory 30 can be internal or external to at least one processor 10 and can be coupled to at least one processor 10 through a variety of techniques, such as wired or wireless communication.
[0207] [0207] The user can enter various types of information (for example, instructional information, such as a phone number) by various techniques, such as pressing a button on the keyboard 20 or activating a voice using the micro- phone 50. The at least one processor 10 performs appropriate functions, such as receiving and / or processing user information and dialing a phone number.
[0208] [0208] It is also possible to recover data (for example, operational data) from SIM card 25 or at least one memory 30 to perform the appropriate functions. In addition, at least one processor 10 can receive and process GPS information from the GPS chip to obtain location information from the terminal and / or base station, such as vehicle navigation, map service or the like. , or perform functions related to location information. In addition, at least one processor 10 can display these various types of information and data on screen 15 for user reference and convenience.
[0209] [0209] Transceiver 35 is coupled to at least one processor 10 for transmitting and / or receiving radio signals, such as RF signals. At this time, at least one processor 10 can control transceiver 35 to initiate communications and transmit wireless signals, including various types of information or data, such as voice communication data. Transceiver 35 may comprise a receiver for receiving the radio signal and a transmitter for transmission. Antenna 40 facilitates the transmission and reception of radio signals. In some implementations, after receiving a radio signal, transceiver 35 can route and convert the signal to a baseband frequency for processing by at least one processor 10. Processed signals can be processed accordingly with various techniques, such as being converted into audible or readable information, and these signals can be emitted through the speaker 45.
[0210] [0210] In some implementations, a sensor can also be coupled to at least one processor 10. The sensor can include one or more detection devices configured to detect various types of information, including speed, acceleration, light, vibration and the like . The at least one processor 10 receives and processes the sensor information obtained from the sensor, such as proximity, position, image and the like, thus performing various functions, such as collision prevention and autonomous displacement.
[0211] [0211] Also, several components, such as a camera, a USB port and the like can be included in the terminal and / or in the base station. For example, a camera can also be connected to at least one processor 10, which can be used for a variety of services, such as autonomous navigation, vehicle security services and the like.
[0212] [0212] Figure 22 merely illustrates an example of an apparatus that constitutes the terminal and / or the base station, and the present invention is not limited to it. For example, some components, such as keyboard 20, Global Positioning System (GPS) chip, sensor, speaker 45 and / or microphone 50, may be excluded for terminal and / or base station implementations in some implementations.
[0213] [0213] Specifically, in order to implement implementations of the present invention, an example of operations of the wireless communication apparatus represented in Figure 22 in the case of a terminal, according to an implementation of the present invention, will be described. If the wireless communication device is a terminal, according to an implementation of the present invention, the at least one processor 10 can include a transceiver 35 for receiving a DCI containing first information to change an active BWP from a first BWP to a second BWP, and can interpret and obtain information related to the PDSCH programming included in the DCI based on the configuration of the second BWP. The bits included in the DCI can be generated based on the configuration for the first BWP, and the bits based on the settings for the second BWP may be needed to interpret the PDSCH programming information received on the second BWP. If there is a discrepancy between the number of bits needed to interpret the PDSCH programming information and the number of bits included in the received DCI, then the DCI can be interpreted according to the implementations described based on Figures 1 to 21 and [ Table 4] to [Table 5] for programming information for the PDSCH.
[0214] [0214] If at least one processor 10 obtains PDSCH programming information through an interpretation of DCI according to the implementations described based on Figures 1 to 21 and [Table 4] to [Table 5], then, the at least one processor 10 can control transceiver 35 to receive the PDSCH in the second BWP based on the obtained PDSCH programming information.
[0215] [0215] In some implementations of the present invention, when the wireless communication apparatus shown in Figure 15 is a base station, the at least one processor 10 can control transceiver 35 to send the DCI to the UE which includes the first information for change the active BWP from the first BWP to the second BWP. In this case, the DCI can include various information to program the PDSCH, in addition to changing the active BWP. In this case, the PDSCH can be programmed to be transmitted on the second BWP, for example. For example, the DCI bit size can be determined based on the configuration for the first BWP,
[0216] [0216] However, if the bit size required for the second BWP is greater than the size of the DCI actually transmitted, the BS can program the PDSCH in the second BWP taking this into account. For example, if the UE 10 has an incompatibility between the settings for the first BWP and the settings for the second BWP, given the ambiguity of the DCI size that can occur, the PDSCH in the second BWP can be programmed within a range that can be represented by the bit size of the DCI actually transmitted. However, the base station can control transceiver 35 to transmit the PDSCH on the second BWP based on the DCI.
[0217] [0217] The implementations described above are those in which the elements and resources of the present invention are combined in a predetermined way.
[0218] [0218] The specific operation described here as being performed by the base station can be performed by its upper node, in some cases. That is, it is evident that various operations performed for communication with a terminal on a network, including a plurality of network nodes that include a base station, can be performed by the base station or by a network node other than the base station. base. A base station can be replaced by terms such as a fixed station, a Node B, an eNode B (eNB), an access point and the like.
[0219] [0219] Implementations according to the present invention can be implemented by various means, for example, hardware, firmware, software or a combination of them. In the case of hardware implementation, an implementation of the present invention may include one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), arrays of field programmable ports of programmable logic devices (PLDs), processors, controllers, microcontrollers, microprocessors and the like.
[0220] [0220] In the case of an implementation by firmware or software, an implementation of the present invention can be implemented in the form of a module, a procedure, a function or the like to perform the functions or operations described above. The software code can be stored in a memory unit and triggered by the processor. The memory unit can be located inside or outside the processor and can exchange data with the processor by several well-known means.
[0221] [0221] It will be apparent to those skilled in the art that the present invention can be incorporated into other specific forms without departing from the spirit of the invention. Therefore, the above description should not be interpreted in a limiting sense in all aspects and should be considered illustrative. The scope of the present invention must be determined by the rational interpretation of the appended claims, and all changes in the scope of equivalents of the present invention are included in the scope of the present invention. INDUSTRIAL APPLICABILITY
[0222] [0222] Although the method and apparatus for transmitting and receiving the downlink data channel have been described with reference to the fifth generation NewRAT system, the present invention can be applied to various wireless communication systems that do not be the fifth generation NewRAT system.

权利要求:
Claims (20)
[1]
1. Method performed by a user equipment (UE) in a wireless communication system, CHARACTERIZED by the fact that it comprises: receiving, in a first part of Bandwidth (BWP) of downlink (DL), Control Information of Downlink (DCI) comprising (i) BWP switching information that indicates switching from an active BWP DL from the first BWP DL to a second BWP DL, and (ii) Transport Block (TB) information that is relative to a TB for a Shared Physical Downlink Channel (PDSCH); based on UE being configured to receive a maximum of 1 TB for the PDSCH in the first BWP DL and a maximum of 2 TBs for the PDSCH in the second BWP DL: process the TB information in the DCI as relating to only one TB among the 2 TBs configured for the PDSCH in the second BWP DL; and receiving the PDSCH on the second BWP DL based on the BWP switching information and the TB information.
[2]
2. Method, according to claim 1, CHARACTERIZED by the fact that the processing of TB information in the DCI as relating to only one TB among the 2 TBs configured for the PDSCH in the second BWP DL comprises: processing first TB information that are related to one TB among the 2 TBs; and determine that the second TB information, which is related to another TB among the 2 TBs, consists of filling in with zero.
[3]
3. Method, according to claim 1, CHARACTERIZED by the fact that the processing of TB information in the DCI as relating to only one TB among the 2 TBs configured for the PDSCH in the second BWP DL comprises: processing first TB information that are related to one TB among the 2 TBs; and ignore second TB information that is related to another TB among the 2 TBs.
[4]
4. Method, according to claim 3, CHARACTERIZED by the fact that ignoring the second TB information comprises: processing the TB information in the DCI ignoring the bit fields for a Modulation and Coding Scheme (MCS), a New Indicator (NDI) and a Redundancy Version (RV) for the other TB among the 2 TBs.
[5]
5. Method, according to claim 1, CHARACTERIZED by the fact that the processing of TB information in the DCI as relating to only one TB among the 2 TBs configured for the PDSCH in the second BWP DL comprises: processing first TB information that are related to one TB among the 2 TB; and determine that second TB information, which is related to another TB among the 2 TBs, is disabled.
[6]
6. Method, according to claim 1, CHARACTERIZED by the fact that the UE being configured to receive a maximum of 1 TB for the PDSCH in the first BWP DL and a maximum of 2 TBs for the PDSCH in the second BWP DL is based on: receive, through the UE, through a first RRC layer signaling, a first maxNrofCodeWordsScheduledByDCI parameter for the first BWP DL which is equal to 1, and receive, through the UE, through a second RRC layer signaling, a second maxNrofCodeWordsScheduledByDCI parameter for the second BWP DL which is equal to 2.
[7]
7. Method, according to claim 1, CHARACTERIZED by the fact that the transmission configuration information (TCI) for the second BWP DL is the same as the TCI information related to DCI.
[8]
8. Method, according to claim 7, CHARACTERIZED by the fact that the TCI information related to the DCI comprises: TCI information for a Set of Control Resources (CORESET) that are related to the DCI.
[9]
9. Method, according to claim 1, CHARACTERIZED by the fact that the first BWP DL consists of a first plurality of physical resource blocks (PRBs) that are contiguous in frequency, and that the second BWP DL consists of a second plurality of PRBs that are contiguous in frequency.
[10]
10. Method, according to claim 1, CHARACTERIZED by the fact that the active BWP DL consists of a plurality of physical resource blocks (PRBs) that are contiguous in frequency and in which the UE is configured to receive the PDSCH.
[11]
11. Device configured to control user equipment (UE) to operate in a wireless communication system, CHARACTERIZED by the fact that it comprises: at least one processor; and at least one memory operationally connectable to at least one processor and storing instructions that, when executed by at least one processor, perform operations comprising: receiving, in a first Downlink Bandwidth (BWP) Part, DL Information Downlink Control (DCI) comprising (i) BWP switching information that indicates switching from an active BWP DL from the first BWP DL to a second BWP DL, and (ii) Transport Block (TB) information that is related to a TB for a Shared Physical Downlink Channel (PDSCH); based on UE being configured to receive a maximum of 1 TB for the PDSCH in the first BWP DL and a maximum of 2 TB for the PDSCH in the second BWP
DL: process the TB information in the DCI as relating to only one TB among the 2 TBs configured for the PDSCH in the second BWP DL; and receiving the PDSCH on the second BWP DL based on the BWP switching information and the TB information.
[12]
12. Apparatus, according to claim 11, CHARACTERIZED by the fact that the processing of TB information in the DCI as relating to only one TB among the 2 TBs configured for the PDSCH in the second BWP DL comprises: processing first TB information that are related to one TB among the 2 TBs; and determine that the second TB information, which is related to another TB among the 2 TBs, consists of filling in with zero.
[13]
13. Apparatus, according to claim 11, CHARACTERIZED by the fact that the processing of TB information in the DCI as relating to only one TB among the 2 TBs configured for the PDSCH in the second BWP DL comprises: processing first TB information that are related to one TB among the 2 TBs; and ignore second TB information that is related to another TB among the 2 TBs.
[14]
14. Apparatus, according to claim 13, CHARACTERIZED by the fact that ignoring the second TB information comprises: processing the TB information in the DCI ignoring the bit fields for a Modulation and Coding Scheme (MCS), a New Indicator (NDI) and a Redundancy Version (RV) for the other TB among the 2 TBs.
[15]
15. Device according to claim 11, CHARACTERIZED by the fact that the UE being configured to receive a maximum of 1 TB for the PDSCH in the first BWP DL and a maximum of 2 TBs for the PDSCH in the second BWP DL is based on:
receive, by the UE, through a first signaling of the RRC layer, a first maxNrofCodeWordsScheduledByDCI parameter for the first BWP DL which is equal to 1, and receive, by the UE, through a second signaling of the RRC layer, a second maxNrofCodeWordsScheduledByDCI parameter for the second BWP DL which is equal to 2.
[16]
16. User equipment (UE) configured to operate in a wireless communication system, CHARACTERIZED by the fact that it comprises: a transceiver; at least one processor; and at least one memory operationally connectable to at least one processor and storing instructions that, when executed by at least one processor, perform operations comprising: receiving, in a first Downlink Bandwidth (BWP) Part, DL Information Downlink Control (DCI) comprising (i) BWP switching information that indicates switching from an active BWP DL from the first BWP DL to a second BWP DL, and (ii) Transport Block (TB) information that is related to a TB for a Shared Physical Downlink Channel (PDSCH); based on UE being configured to receive a maximum of 1 TB for the PDSCH in the first BWP DL and a maximum of 2 TBs for the PDSCH in the second BWP DL: process the TB information in the DCI as relating to only one TB among the 2 TBs configured for the PDSCH in the second BWP DL; and receiving the PDSCH on the second BWP DL based on the BWP switching information and the TB information.
[17]
17. EU, according to claim 16, CHARACTERIZED by the fact that the processing of TB information in the DCI as relating to only one TB among the 2 TBs configured for the PDSCH in the second BWP DL comprises:
process first TB information that is related to one TB among the 2 TBs; and determine that the second TB information, which is related to another TB among the 2 TBs, consists of filling in with zero.
[18]
18. EU, according to claim 16, CHARACTERIZED by the fact that the processing of TB information in the DCI as relating to only one TB among the 2 TBs configured for the PDSCH in the second BWP DL comprises: processing first TB information that are related to one TB among the 2 TBs; and ignore second TB information that is related to another TB among the 2 TBs.
[19]
19. EU, according to claim 18, CHARACTERIZED by the fact that ignoring the second TB information comprises: processing the TB information in the DCI ignoring the bit fields for a Modulation and Coding Scheme (MCS), a New Indicator (NDI) and a Redundancy Version (RV) for the other TB among the 2 TBs.
[20]
20. UE, according to claim 16, CHARACTERIZED by the fact that the UE being configured to receive a maximum of 1 TB for the PDSCH in the first BWP DL and a maximum of 2 TBs for the PDSCH in the second BWP DL is based on: receive, through the UE, through a first RRC layer signaling, a first maxNrofCodeWordsScheduledByDCI parameter for the first BWP DL which is equal to 1, and receive, through the UE, through a second RRC layer signaling, a second maxNrofCodeWordsScheduledByDCI parameter for the second BWP DL which is equal to 2.

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