Method and apparatus for transmitting and receiving signal in wireless communication system

Abstract

A method according to at least one of embodiments disclosed in the present specification may comprise: receiving downlink control information (DCI) for uplink scheduling; and transmitting an uplink signal on the basis of at least one codebook in a frequency band allocated through the DCI, wherein pieces of precoding matrix information (PMI) included in the at least one codebook are grouped into multiple PMI groups, and the DCI includes i) a first field for allocating a specific PMI group among the multiple PMI groups to the frequency band, and ii) a second field for allocating PMI within the specific PMI group to each subband of the frequency band.

Description

Method and device for transmitting and receiving signals in a wireless communication system

[0001] This specification relates to a wireless communication system, and more particularly, to a method and device for transmitting or receiving an uplink / downlink wireless signal in a wireless communication system.

[0002] Wireless communication systems are widely deployed to provide various types of communication services, such as voice and data. Typically, wireless communication systems are multiple access systems that support communication with multiple users by sharing available system resources (e.g., bandwidth, transmission power). Examples of multiple access systems include code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), and single-carrier frequency division multiple access (SC-FDMA).

[0003] The technical task to be achieved is to provide a method and a device for performing the process of transmitting and receiving wireless signals more accurately and efficiently.

[0004] The technical tasks to be achieved are not limited to these, and other technical tasks can be inferred from the disclosure of this specification.

[0005] In a wireless communication system according to one aspect, a method for transmitting a signal by a terminal comprises: receiving DCI (downlink control information) for uplink scheduling; and transmitting an uplink signal based on at least one codebook in a frequency band allocated through the DCI, wherein PMI (precoding matrix information) included in the at least one codebook are grouped into a plurality of PMI groups, and the DCI may include i) a first field for allocating a specific PMI group among the plurality of PMI groups to the frequency band, and ii) a second field for allocating a PMI within the specific PMI group for each subband of the frequency band.

[0006] Through the second field above, PMI can be individually assigned to each sub-band.

[0007] All PMIs assigned to sub-bands of the above frequency band may be related to the same rank.

[0008] The above second field can provide differential PMI information based on the PMI of a reference sub-band among the sub-bands of the frequency band.

[0009] The above reference sub-band may be set or predefined via higher layer signaling.

[0010] The size of the first field may be determined based on the total number of the plurality of PMI groups.

[0011]

[0012] The size of the second field may be determined based on a PMI group that includes the largest number of PMIs among the plurality of PMI groups.

[0013] The above second field can assign a PMI to each sub-band through any one of the PMI patterns configured within the above specific PMI group.

[0014] According to another aspect, a computer-readable recording medium having recorded thereon a program for performing the above-described signal transmission method may be provided.

[0015] According to another aspect, a device for wireless communication includes a memory for storing commands; and a processor for performing operations by executing the commands, wherein the operations of the processor include receiving downlink control information (DCI) for uplink scheduling; and transmitting an uplink signal based on at least one codebook in a frequency band allocated through the DCI, wherein PMIs (precoding matrix informations) included in the at least one codebook are grouped into a plurality of PMI groups, and the DCI may include i) a first field for assigning a specific PMI group among the plurality of PMI groups to the frequency band, and ii) a second field for assigning a PMI within the specific PMI group for each subband of the frequency band.

[0016] The above device may further include a transmitter and receiver.

[0017] The above device may be a terminal operating in a wireless communication system.

[0018] The above device may be a processing device configured to control a terminal operating in a wireless communication system.

[0019] In another aspect, a method for a base station to receive a signal in a wireless communication system includes: transmitting downlink control information (DCI) for uplink scheduling; and receiving an uplink signal based on at least one codebook in a frequency band allocated through the DCI, wherein PMI (precoding matrix information) included in the at least one codebook are grouped into a plurality of PMI groups, and the DCI may include i) a first field for allocating a specific PMI group among the plurality of PMI groups to the frequency band, and ii) a second field for allocating a PMI within the specific PMI group for each subband of the frequency band.

[0020] According to another aspect, a base station for wireless communication includes a memory for storing commands; and a processor for performing operations by executing the commands, wherein the operations of the processor include transmitting downlink control information (DCI) for uplink scheduling; and receiving an uplink signal based on at least one codebook in a frequency band allocated through the DCI, wherein PMIs (precoding matrix informations) included in the at least one codebook are grouped into a plurality of PMI groups, and the DCI may include i) a first field for assigning a specific PMI group among the plurality of PMI groups to the frequency band, and ii) a second field for assigning a PMI within the specific PMI group for each subband of the frequency band.

[0021] According to one embodiment, wireless signal transmission and reception can be efficiently performed in a wireless communication system.

[0022] The effects that can be obtained are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art to which the present invention pertains from the description below.

[0023] Figure 1 illustrates physical channels used in a 3GPP system, which is an example of a wireless communication system, and a general signal transmission method using the channels.

[0024] Figure 2 illustrates the structure of a radio frame.

[0025] Figure 3 illustrates a resource grid of slots.

[0026] Figure 4 illustrates an example of physical channels being mapped within a slot.

[0027] Figure 5 illustrates the PDSCH and ACK / NACK transmission process.

[0028] Figure 6 illustrates a PUSCH transmission process.

[0029] Figure 7 shows an example of a CSI-related procedure.

[0030] Figure 8 illustrates multiple TRP transmissions.

[0031] Figure 9 illustrates an example of grouping for an uplink codebook.

[0032] Figures 10 to 12 each illustrate an example of the sliding window method.

[0033] Figure 13 illustrates an example of a differential TPMI instruction method.

[0034] Fig. 14 illustrates an implementation example of the operation of a terminal in a wireless communication system according to one embodiment.

[0035] FIG. 15 illustrates an implementation example of the operation of a base station in a wireless communication system according to one embodiment.

[0036] Figures 16 to 19 illustrate a communication system (1) and a wireless device applicable to the embodiments.

[0037] The following technologies can be used in various wireless access systems, such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), and SC-FDMA (single carrier frequency division multiple access). CDMA can be implemented with radio technologies such as UTRA (Universal Terrestrial Radio Access) or CDMA2000. TDMA can be implemented with radio technologies such as GSM (Global System for Mobile communications) / GPRS (General Packet Radio Service) / EDGE (Enhanced Data Rates for GSM Evolution). OFDMA can be implemented with radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (Evolved UTRA). UTRA is a part of UMTS (Universal Mobile Telecommunications System). 3GPP (3rd Generation Partnership Project) LTE (long term evolution) is part of E-UMTS (Evolved UMTS) that uses E-UTRA, and LTE-A (Advanced) is an evolved version of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolved version of 3GPP LTE / LTE-A.

[0038] As more and more communication devices demand greater communication capacity, the need for improved mobile broadband communications compared to existing Radio Access Technology (RAT) is emerging. Furthermore, massive Machine Type Communications (MTC), which connects multiple devices and objects to provide diverse services anytime, anywhere, is also a key issue to be considered in next-generation communications. Furthermore, communication system design that considers reliability and latency-sensitive services / terminals is being discussed. Accordingly, the introduction of next-generation RATs that consider enhanced Mobile BroadBand Communication (eMBB), massive MTC, and Ultra-Reliable and Low Latency Communication (URLLC) is being discussed. For convenience, this technology is referred to as NR (New Radio or New RAT) in the present invention.

[0039] For clarity of explanation, the description will focus on 3GPP NR, but the technical idea of ​​the present invention is not limited thereto.

[0040] In this specification, the expression "setting" can be replaced with the expression "configure / configuration", and the two can be used interchangeably. In addition, conditional expressions (e.g., "if", "in a case", or "when", etc.) can be replaced with the expression "based on that ~~" or "in a state / status". In addition, the operation of the terminal / base station or the SW / HW configuration according to the satisfaction of the condition can be inferred / understood. In addition, if the process of the receiving (or transmitting) side can be inferred / understood from the process of the transmitting (or receiving) side in signal transmission / reception between wireless communication devices (e.g., base stations, terminals), the description thereof can be omitted. For example, signal determination / generation / encoding / transmission, etc. of the transmitting side can be understood as signal monitoring reception / decoding / determination, etc. of the receiving side. In addition, the expression that the terminal performs (or does not perform) a specific operation can also be interpreted as meaning that the base station operates while expecting / assuming (or expecting / assuming that the terminal does not perform) the specific operation. In addition, the expression that the base station performs (or does not perform) a specific operation can also be interpreted as meaning that the terminal operates while expecting / assuming (or expecting / assuming that the base station does not perform) the specific operation. In addition, the division and index of each section, embodiment, example, option, method, plan, etc. in the following description are for the convenience of explanation and should not be interpreted as meaning that each constitutes an independent invention or that each must be implemented only individually. In addition, in describing each section, embodiment, example, option, method, plan, etc., if there is no explicitly conflicting / opposing description, it can be inferred / interpreted that at least some of them can be combined and implemented together, or at least some can be implemented with the omission of each.

[0041] In a wireless communication system, a terminal receives information from a base station via the downlink (DL) and transmits it to the base station via the uplink (UL). The information transmitted and received between the base station and the terminal includes data and various control information, and various physical channels exist depending on the type and purpose of the information being transmitted and received.

[0042] Figure 1 is a drawing for explaining physical channels used in a 3GPP NR system and a general signal transmission method using them.

[0043] When a terminal is powered on again from a powered-off state or enters a new cell, it performs an initial cell search operation, such as synchronizing with the base station, in step S101. To this end, the terminal receives a Synchronization Signal Block (SSB) from the base station. The SSB includes a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). Based on the PSS / SSS, the terminal synchronizes with the base station and obtains information such as a cell ID (cell identity). In addition, the terminal can obtain broadcast information within the cell based on the PBCH. Meanwhile, the terminal can check the downlink channel status by receiving a Downlink Reference Signal (DL RS) during the initial cell search phase.

[0044] After completing the initial cell search, the terminal can obtain more specific system information by receiving a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) based on the physical downlink control channel information in step S102.

[0045] Thereafter, the terminal may perform a random access procedure such as steps S103 to S106 to complete connection to the base station. To this end, the terminal may transmit a preamble through a physical random access channel (PRACH) (S103) and receive a response message to the preamble through a physical downlink control channel and a corresponding physical downlink shared channel (S104). In the case of contention-based random access, a contention resolution procedure such as transmission of an additional physical random access channel (S105) and reception of a physical downlink control channel and a corresponding physical downlink shared channel (S106) may be performed.

[0046] The terminal that has performed the procedure as described above can then perform the general uplink / downlink signal transmission procedure, such as receiving a physical downlink control channel / physical downlink shared channel (S107) and transmitting a physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) (S108). The control information that the terminal transmits to the base station is collectively referred to as uplink control information (UCI). UCI includes HARQ ACK / NACK (Hybrid Automatic Repeat and request Acknowledgement / Negative-ACK), SR (Scheduling Request), CSI (Channel State Information), etc. CSI includes CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), RI (Rank Indication), etc. UCI is generally transmitted through PUCCH, but can be transmitted through PUSCH when control information and traffic data must be transmitted simultaneously. Additionally, UCI can be transmitted aperiodically via PUSCH upon request / instruction from the network.

[0047] Figure 2 illustrates the structure of a radio frame. In NR, uplink and downlink transmissions are organized into frames. Each radio frame is 10 ms long and is divided into two 5 ms half-frames (HF). Each half-frame is divided into five 1 ms sub-frames (SF). A sub-frame is divided into one or more slots, and the number of slots within a sub-frame depends on the subcarrier spacing (SCS). Each slot contains 12 or 14 OFDM (Orthogonal Frequency Division Multiplexing) symbols, depending on the cyclic prefix (CP). When a normal CP is used, each slot contains 14 OFDM symbols. When an extended CP is used, each slot contains 12 OFDM symbols.

[0048] Table 1 illustrates that when CP is normally used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS.

[0049] SCS (15*2^u)N slot symb N frame,u slot N subframe,u slot 15KHz (u=0)1410130KHz (u=1)1420260KHz (u=2)14404120KHz (u=3)14808240KHz (u=4)1416016

[0050] * N slot symb : Number of symbols in the slot

[0051] * N frame,u slot : Number of slots in the frame

[0052] * N subframe,u slot : Number of slots in a subframe

[0053] Table 2 illustrates that when extended CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS.

[0054] SCS (15*2^u)N slot symb N frame,u slot N subframe,u slot 60KHz (u=2)12404

[0055] The structure of the frame is only an example, and the number of subframes, number of slots, and number of symbols in the frame can be varied.

[0056] In an NR system, OFDM numerology (e.g., SCS) may be set differently between multiple cells that are merged into a single terminal. Accordingly, the (absolute time) interval of a time resource (e.g., SF, slot, or TTI) (conveniently referred to as TU (Time Unit)) consisting of the same number of symbols may be set differently between the merged cells. Here, the symbol may include an OFDM symbol (or CP-OFDM symbol), an SC-FDMA symbol (or Discrete Fourier Transform-spread-OFDM, DFT-s-OFDM symbol).

[0057] Figure 3 illustrates a resource grid of a slot. A slot contains multiple symbols in the time domain. For example, in the case of a regular CP, one slot contains 14 symbols, but in the case of an extended CP, one slot contains 12 symbols. A carrier contains multiple subcarriers in the frequency domain. A Resource Block (RB) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A Bandwidth Part (BWP) is defined as multiple consecutive Physical RBs (PRBs) in the frequency domain and can correspond to a single numerology (e.g., SCS, CP length, etc.). A carrier can contain up to N (e.g., 5) BWPs. Data communication is performed through activated BWPs, and only one BWP can be activated for a single terminal. Each element in the resource grid is referred to as a Resource Element (RE), to which one complex symbol can be mapped.

[0058] Figure 4 illustrates an example of how physical channels are mapped within a slot. A PDCCH can be transmitted in the DL control region, and a PDSCH can be transmitted in the DL data region. A PUCCH can be transmitted in the UL control region, and a PUSCH can be transmitted in the UL data region. GP provides a time gap between the base station and the terminal when switching from transmission mode to reception mode or from reception mode to transmission mode. Some symbols within a subframe at the time of transition from DL to UL can be set as GP.

[0059] Below, each physical channel is described in more detail.

[0060] The PDCCH carries Downlink Control Information (DCI). For example, the PCCCH (i.e., DCI) carries the transmission format and resource allocation of the downlink shared channel (DL-SCH), resource allocation information for the uplink shared channel (UL-SCH), paging information for the paging channel (PCH), system information on the DL-SCH, resource allocation information for upper layer control messages such as random access responses transmitted on the PDSCH, transmission power control commands, activation / deactivation of Configured Scheduling (CS), etc. The DCI includes a cyclic redundancy check (CRC), which is masked / scrambled with various identifiers (e.g., Radio Network Temporary Identifier, RNTI) depending on the owner or usage of the PDCCH. For example, if the PDCCH is for a specific terminal, the CRC is masked with a terminal identifier (e.g., Cell-RNTI, C-RNTI). If the PDCCH is for paging, the CRC is masked with the Paging-RNTI (P-RNTI). If the PDCCH is for system information (e.g., a System Information Block, SIB), the CRC is masked with the System Information RNTI (SI-RNTI). If the PDCCH is for a random access response, the CRC is masked with the Random Access-RNTI (RA-RNTI).

[0061] The PDCCH consists of 1, 2, 4, 8, or 16 Control Channel Elements (CCEs) depending on the Aggregation Level (AL). A CCE is a logical allocation unit used to provide a PDCCH with a predetermined code rate depending on the radio channel status. A CCE consists of six Resource Element Groups (REGs). A REG is defined as one OFDM symbol and one (P)RB. The PDCCH is transmitted through a Control Resource Set (CORESET). A CORESET is defined as a set of REGs with a given numerology (e.g., SCS, CP length, etc.). Multiple CORESETs for a single UE can overlap in the time / frequency domain. A CORESET can be configured through system information (e.g., Master Information Block, MIB) or UE-specific upper layer (e.g., Radio Resource Control, RRC, layer) signaling. Specifically, the number of RBs and the number of OFDM symbols (up to 3) that constitute the CORESET can be set by upper layer signaling.

[0062] To receive / detect PDCCH, the UE monitors PDCCH candidates. PDCCH candidates represent the CCE(s) that the UE should monitor for PDCCH detection. Each PDCCH candidate is defined as 1, 2, 4, 8, or 16 CCEs depending on the AL. Monitoring involves (blind) decoding the PDCCH candidates. The set of PDCCH candidates that the UE monitors is defined as a PDCCH Search Space (SS). The search space includes a Common Search Space (CSS) or a UE-specific search space (USS). The UE can acquire DCI by monitoring PDCCH candidates in one or more search spaces configured by the MIB or higher-layer signaling. Each CORESET is associated with one or more search spaces, and each search space is associated with one COREST. The search space can be defined based on the following parameters.

[0063] - controlResourceSetId: Indicates the CORESET associated with the search space.

[0064] - monitoringSlotPeriodicityAndOffset: Indicates the PDCCH monitoring period (in slots) and the PDCCH monitoring interval offset (in slots).

[0065] - monitoringSymbolsWithinSlot: Indicates the PDCCH monitoring symbols within the slot (e.g., the first symbol(s) of the CORESET).

[0066] - nrofCandidates: AL={1, 2, 4, 8, 16} indicates the number of PDCCH candidates (one of 0, 1, 2, 3, 4, 5, 6, 8)

[0067] * An opportunity (e.g., time / frequency resource) for monitoring PDCCH candidates is defined as a PDCCH (monitoring) opportunity. One or more PDCCH (monitoring) opportunities can be configured within a slot.

[0068] Table 3 illustrates the characteristics of each search space type.

[0069] TypeSearch SpaceRNTIUse CaseType0-PDCCHCommonSI-RNTI on a primary cellSIB DecodingType0A-PDCCHCommonSI-RNTI on a primary cellSIB DecodingType1-PDCCHCommonRA-RNTI or TC-RNTI on a primary cellMsg2, Msg4 decoding in RACHType2-PDCCHCommonP-RNTI on a primary cellPaging DecodingType3-PDCCHCommonINT-RNTI, SFI-RNTI, TPC-PUSCH-RNTI, TPC-PUCCH-RNTI, TPC-SRS-RNTI, C-RNTI, MCS-C-RNTI, or CS-RNTI(s)UE SpecificUE SpecificC-RNTI, or MCS-C-RNTI, or CS-RNTI(s)User specific PDSCH decoding

[0070] Table 4 illustrates DCI formats transmitted via PDCCH.

[0071] DCI formatUsage0_0Scheduling of PUSCH in one cell0_1Scheduling of PUSCH in one cell1_0Scheduling of PDSCH in one cell1_1Scheduling of PDSCH in one cell2_0Notifying a group of UEs of the slot format2_1Notifying a group of UEs of the PRB(s) and OFDM symbol(s) where UE may assume no transmission is intended for the UE2_2Transmission of TPC commands for PUCCH and PUSCH2_3Transmission of a group of TPC commands for SRS transmissions by one or more UEs

[0072] DCI format 0_0 is used to schedule a TB-based (or TB-level) PUSCH, and DCI format 0_1 ​​can be used to schedule a TB-based (or TB-level) PUSCH or a CBG (Code Block Group)-based (or CBG-level) PUSCH. DCI format 1_0 is used to schedule a TB-based (or TB-level) PDSCH, and DCI format 1_1 can be used to schedule a TB-based (or TB-level) PDSCH or a CBG-based (or CBG-level) PDSCH (DL grant DCI). DCI format 0_0 / 0_1 may be referred to as UL grant DCI or UL scheduling information, and DCI format 1_0 / 1_1 may be referred to as DL grant DCI or DL ​​scheduling information. DCI format 2_0 is used to convey dynamic slot format information (e.g., dynamic SFI) to the terminal, and DCI format 2_1 is used to convey downlink pre-emption information to the terminal. DCI format 2_0 and / or DCI format 2_1 can be conveyed to the terminals within a group through the group common PDCCH, which is a PDCCH conveyed to the terminals defined as a group.

[0073] DCI format 0_0 and DCI format 1_0 may be referred to as fallback DCI formats, while DCI format 0_1 ​​and DCI format 1_1 may be referred to as non-fallback DCI formats. In the fallback DCI format, the DCI size / field configuration remains the same regardless of the terminal configuration. On the other hand, in the non-fallback DCI format, the DCI size / field configuration varies depending on the terminal configuration.

[0074] PDSCH carries downlink data (e.g., DL-SCH transport block, DL-SCH TB) and applies modulation methods such as Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (QAM), 64 QAM, and 256 QAM. TB is encoded to generate a codeword. PDSCH can carry up to two codewords. Scrambling and modulation mapping are performed for each codeword, and modulation symbols generated from each codeword can be mapped to one or more layers. Each layer is mapped to resources along with a Demodulation Reference Signal (DMRS), generated as an OFDM symbol signal, and transmitted through the corresponding antenna port.

[0075] PUCCH carries Uplink Control Information (UCI). UCI includes:

[0076] - SR (Scheduling Request): Information used to request UL-SCH resources.

[0077] - HARQ(Hybrid Automatic Repeat reQuest)-ACK(Acknowledgement): This is a response to a downlink data packet (e.g., codeword) on the PDSCH. It indicates whether the downlink data packet was successfully received. One HARQ-ACK bit can be transmitted in response to a single codeword, and two HARQ-ACK bits can be transmitted in response to two codewords. The HARQ-ACK response includes a positive ACK (simply, ACK), a negative ACK (NACK), a DTX, or a NACK / DTX. Here, HARQ-ACK is used interchangeably with HARQ ACK / NACK and ACK / NACK.

[0078] - CSI (Channel State Information): Feedback information for the downlink channel. MIMO (Multiple Input Multiple Output)-related feedback information includes the Rank Indicator (RI) and Precoding Matrix Indicator (PMI).

[0079] Table 5 illustrates PUCCH formats. Depending on the PUCCH transmission length, they can be classified into Short PUCCH (formats 0 and 2) and Long PUCCH (formats 1, 3, and 4).

[0080] PUCCH formatLength in OFDM symbols N PUCCH symb Number of bitsUsageEtc01 - 2≤2HARQ, SRSequence selection14 - 14≤2HARQ, [SR]Sequence modulation21 - 2>2HARQ, CSI, [SR]CP-OFDM34 - 14>2HARQ, CSI, [SR]DFT-s-OFDM(no UE multiplexing)44 - 14>2HARQ, CSI, [SR]DFT-s-OFDM(Pre DFT OCC)

[0081] PUCCH format 0 carries UCI of up to 2 bits in size and is mapped and transmitted based on sequence. Specifically, the terminal transmits a specific UCI to the base station by transmitting one of multiple sequences through the PUCCH of PUCCH format 0. The terminal transmits the PUCCH of PUCCH format 0 within the PUCCH resources for the corresponding SR configuration only when transmitting a positive SR.

[0082] PUCCH format 1 carries UCI of up to 2 bits in size, and modulation symbols are spread in the time domain using an orthogonal cover code (OCC) (which is set differently depending on whether frequency hopping is used). DMRS are transmitted in symbols where modulation symbols are not transmitted (i.e., transmitted using Time Division Multiplexing (TDM).

[0083] PUCCH format 2 carries UCI with a bit size greater than 2 bits, and modulation symbols are transmitted by frequency division multiplexing (FDM) with DMRS. DM-RSs are located at symbol indices #1, #4, #7, and #10 within a given resource block with a density of 1 / 3. Pseudo Noise (PN) sequences are used for DM_RS sequences. Frequency hopping can be enabled for 2-symbol PUCCH format 2.

[0084] PUCCH format 3 does not multiplex terminals within the same physical resource blocks and carries UCI with a bit size greater than 2 bits. In other words, PUCCH resources in PUCCH format 3 do not include orthogonal cover codes. Modulation symbols are transmitted through time division multiplexing (TDM) with DMRS.

[0085] PUCCH format 4 supports multiplexing of up to four terminals within the same physical resource blocks and carries UCI with a bit size greater than 2 bits. In other words, PUCCH resources in PUCCH format 3 include orthogonal cover codes. Modulation symbols are transmitted through time division multiplexing (TDM) with DMRS.

[0086] At least one of one or more configured cells in a terminal may be configured for PUCCH transmission. At least the primary cell may be configured as a cell for PUCCH transmission. At least one PUCCH cell group may be configured in the terminal based on at least one cell configured for PUCCH transmission, and each PUCCH cell group includes one or more cells. The PUCCH cell group may be simply referred to as a PUCCH group. PUCCH transmission may be configured not only for the primary cell but also for the SCell, and the primary cell belongs to the primary PUCCH group, and the PUCCH-SCell configured for PUCCH transmission belongs to the secondary PUCCH group. For cells belonging to the primary PUCCH group, the PUCCH on the primary cell may be used, and for cells belonging to the secondary PUCCH group, the PUCCH on the PUCCH-SCell may be used.

[0087] PUSCH carries uplink data (e.g., UL-SCH transport block, UL-SCH TB) and / or uplink control information (UCI), and is transmitted based on a CP-OFDM (Cyclic Prefix - Orthogonal Frequency Division Multiplexing) waveform or a DFT-s-OFDM (Discrete Fourier Transform - spread - Orthogonal Frequency Division Multiplexing) waveform. When the PUSCH is transmitted based on a DFT-s-OFDM waveform, the UE transmits the PUSCH by applying transform precoding. For example, when transform precoding is disabled (e.g., transform precoding is disabled), the UE transmits the PUSCH based on the CP-OFDM waveform, and when transform precoding is enabled (e.g., transform precoding is enabled), the UE can transmit the PUSCH based on the CP-OFDM waveform or the DFT-s-OFDM waveform. PUSCH transmissions can be dynamically scheduled by UL grants in DCI, or semi-statically scheduled (configured grant) based on higher layer (e.g., RRC) signaling (and / or Layer 1 (L1) signaling (e.g., PDCCH)). PUSCH transmissions can be performed in a codebook-based or non-codebook-based manner.

[0088] Figure 5 illustrates an ACK / NACK transmission process. Referring to Figure 5, a terminal can detect a PDCCH in slot #n. Here, the PDCCH includes downlink scheduling information (e.g., DCI formats 1_0, 1_1), and the PDCCH indicates a DL assignment-to-PDSCH offset (K0) and a PDSCH-HARQ-ACK reporting offset (K1). For example, DCI formats 1_0, 1_1 can include the following information:

[0089] - Frequency domain resource assignment: Indicates the set of RBs allocated to the PDSCH.

[0090] - Time domain resource assignment: K0 (e.g., slot offset), indicates the starting position of the PDSCH within slot #n+K0 (e.g., OFDM symbol index), and the length of the PDSCH (e.g., number of OFDM symbols).

[0091] - PDSCH-to-HARQ_feedback timing indicator: Indicates K1

[0092] - HARQ process number (4 bits): Indicates the HARQ process ID (Identity) for data (e.g., PDSCH, TB)

[0093] - PUCCH resource indicator (PRI): Indicates the PUCCH resource to be used for UCI transmission among multiple PUCCH resources within the PUCCH resource set.

[0094] Afterwards, the terminal receives PDSCH from slot #(n+K0) according to the scheduling information of slot #n, and when reception of PDSCH is finished in slot #n1 (where, n+K0≤n1), UCI can be transmitted through PUCCH in slot #(n1+K1). Here, UCI may include HARQ-ACK response for PDSCH. In Fig. 5, for convenience, it is assumed that SCS for PDSCH and SCS for PUCCH are the same and slot # n1 = slot #n+K0, but the present invention is not limited thereto. If the SCSs are different, K1 can be indicated / interpreted based on the SCS of PUCCH.

[0095] When the PDSCH is configured to transmit at most 1 TB, the HARQ-ACK response may consist of 1 bit. When the PDSCH is configured to transmit at most 2 TB, the HARQ-ACK response may consist of 2 bits if spatial bundling is not configured, and may consist of 1 bit if spatial bundling is configured. When the HARQ-ACK transmission timing for multiple PDSCHs is designated as slot #(n+K1), the UCI transmitted in slot #(n+K1) includes HARQ-ACK responses for multiple PDSCHs.

[0096] Whether a UE should perform spatial bundling for a HARQ-ACK response can be configured (e.g., via RRC / higher layer signaling) for each cell group. For example, spatial bundling can be individually configured for each HARQ-ACK response transmitted over the PUCCH and / or each HARQ-ACK response transmitted over the PUSCH.

[0097] Spatial bundling can be supported when the maximum number of TBs (or codewords) that can be received at a time (or scheduled via 1 DCI) in the serving cell is 2 (or more than 2) (e.g., when the upper layer parameter maxNrofCodeWordsScheduledByDCI corresponds to 2-TB). Meanwhile, more than 4 layers can be used for 2-TB transmission, and up to 4 layers can be used for 1-TB transmission. Consequently, when spatial bundling is configured for the cell group, spatial bundling can be performed for serving cells that can schedule more than 4 layers among the serving cells in the cell group. On the serving cell, a terminal that wishes to transmit a HARQ-ACK response via spatial bundling can generate the HARQ-ACK response by performing a (bit-wise) logical AND operation on the A / N bits for multiple TBs.

[0098] For example, assuming that a terminal receives a DCI scheduling 2 TB and receives 2 TB via PDSCH based on the DCI, the terminal performing spatial bundling can generate a single A / N bit by logically ANDing the first A / N bit for the first TB and the second A / N bit for the second TB. Consequently, if both the first TB and the second TB are ACK, the terminal reports the ACK bit value to the base station, and if either TB is NACK, the terminal reports the NACK bit value to the base station.

[0099] For example, if only 1-TB is actually scheduled on a serving cell configured to receive 2-TB, the terminal can generate a single A / N bit by logically ANDing the A / N bit for the 1-TB with bit value 1. Consequently, the terminal reports the A / N bit for the 1-TB to the base station as is.

[0100] A base station / terminal has multiple parallel DL HARQ processes for DL ​​transmission. These multiple parallel HARQ processes allow DL transmissions to be performed continuously while waiting for HARQ feedback regarding the success or failure of the previous DL transmission. Each HARQ process is associated with a HARQ buffer in the MAC (Medium Access Control) layer. Each DL HARQ process manages state variables such as the number of transmissions of MAC Physical Data Blocks (PDUs) in the buffer, HARQ feedback for MAC PDUs in the buffer, and the current redundancy version. Each HARQ process is identified by a HARQ process ID.

[0101] Figure 6 illustrates a PUSCH transmission process. Referring to Figure 6, a terminal can detect a PDCCH in slot #n. Here, the PDCCH includes uplink scheduling information (e.g., DCI formats 0_0 and 0_1). DCI formats 0_0 and 0_1 can include the following information.

[0102] - Frequency domain resource assignment: Indicates the set of RBs allocated to PUSCH.

[0103] - Time domain resource assignment: Slot offset K2 indicates the starting position (e.g., symbol index) and length (e.g., number of OFDM symbols) of the PUSCH within the slot. The starting symbol and length can be indicated through SLIV (Start and Length Indicator Value) or can be indicated separately.

[0104] Thereafter, the terminal can transmit a PUSCH in slot #(n+K2) according to the scheduling information of slot #n. Here, the PUSCH includes a UL-SCH TB.

[0105] DCI (e.g., UL scheduling DCI format 0_1, 0_2, etc.) includes an SRS resource indicator (SRI) and an SRS request. The SRI field can indicate SRS resources configured within the SRS resource set associated with the upper layer parameter 'usage'. In addition, 'spatialRelationInfo' can be configured for each SRS resource, and its value can be one of {CRI, SSB, SRI}.

[0106] i) In codebook-based PUSCH transmission, the UE can determine a PUSCH transmission precoder based on the SRI, TPMI (Transmit Precoding Matrix Indicator) and transmission rank of the DCI. The TPMI is used to indicate a precoder to be applied across antenna ports, and corresponds to an SRS resource selected by the SRI when multiple SRS resources are configured. Alternatively, when a single SRS resource is configured, the TPMI is used to indicate a precoder to be applied across antenna ports, and corresponds to the single SRS resource. The transmission precoder is selected from an uplink codebook having the same number of antenna ports as the upper layer parameter 'nrofSRS-Ports'. When the upper layer in which the UE is set to 'codebook' is configured with the parameter 'txConfig', the UE is configured with at least one SRS resource. The SRI indicated in slot n is associated with the most recent transmission of the SRS resource identified by the SRI, where the SRS resource precedes the PDCCH carrying the SRI (i.e., slot n).

[0107] Tables 6 through 12 are excerpts from the UL codebooks defined in the NR standard.

[0108] Table 6 is a codebook for single layer transmission through two antenna ports.

[0109]

[0110] Table 7 is a codebook for single layer transmission over 4 antenna ports when transform precoding is enabled.

[0111]

[0112] Table 8 is a codebook for single layer transmission over 4 antenna ports when transform precoding is disabled.

[0113]

[0114] Table 9 is a codebook for two-layer transmission over two antenna ports when transform precoding is disabled.

[0115]

[0116] Table 10 is a codebook for 2-layer transmission over 4 antenna ports when transform precoding is disabled.

[0117]

[0118] Table 11 is a codebook for 3-layer transmission over 4 antenna ports when transform precoding is disabled.

[0119]

[0120] Table 12 is a codebook for 4-layer transmission over 4 antenna ports when transform precoding is disabled.

[0121]

[0122] ii) In non-codebook based PUSCH transmission, when multiple SRS resources are configured, the UE can determine the PUSCH precoder and transmission rank based on the wideband SRI, where the SRI is given by the SRS resource indicator in the DCI or by the higher layer parameter 'srs-ResourceIndicator'. The UE uses one or multiple SRS resources for SRS transmission, where the number of SRS resources can be configured for simultaneous transmission within the same RB based on the UE capability. Only one SRS port is configured for each SRS resource. Only one SRS resource can be configured with the higher layer parameter 'usage' set to 'nonCodebook'. The maximum number of SRS resources that can be configured for non-codebook based uplink transmission is 4. The SRI indicated in slot n is associated with the most recent transmission of the SRS resource identified by the SRI, where the SRS transmission precedes the PDCCH carrying the SRI (i.e., slot n).

[0123] CSI-related actions

[0124] Figure 7 shows an example of a CSI-related procedure.

[0125] The terminal receives configuration information related to CSI from the base station via RRC signaling (710). The configuration information related to CSI may include at least one of CSI-IM (interference management) resource-related information, CSI measurement configuration-related information, CSI resource configuration-related information, CSI-RS resource-related information, or CSI report configuration-related information.

[0126] - CSI-IM resources can be configured for interference measurement (IM) of the terminal. In the time domain, the CSI-IM resource set can be configured periodically, semi-persistently, or aperiodicly. The CSI-IM resources can be configured as Zero Power (ZP)-CSI-RS for the terminal. The ZP-CSI-RS can be configured separately from the Non-Zero Power (NZP)-CSI-RS.

[0127] - The UE may assume that the CSI-RS resource(s) for channel measurement configured for one CSI reporting and the CSI-IM / NZP CSI-RS resource(s) for interference measurement (when NZP CSI-RS resource(s) are used for interference measurement) are in a QCL relationship with respect to 'QCL-TypeD' per resource.

[0128] - The CSI resource configuration may include at least one of a CSI-IM resource for interference measurement, an NZP CSI-RS resource for interference measurement, and an NZP CSI-RS resource for channel measurement. The CMR (channel measurement resource) may be an NZP CSI-RS for CSI acquisition, and the IMR (Interference measurement resource) may be an NZP CSI-RS for CSI-IM and IM.

[0129] - CSI-RS can be configured for one or more terminals. Different CSI-RS configurations may be provided for each terminal, or the same CSI-RS configuration may be provided to multiple terminals. CSI-RS can support up to 32 antenna ports. CSI-RS corresponding to N (N is 1 or greater) antenna ports can be mapped to N RE locations within a time-frequency unit corresponding to one slot and one RB. When N is 2 or greater, N-port CSI-RS can be multiplexed using CDM, FDM, and / or TDM schemes. CSI-RS can be mapped to REs other than REs to which CORESET, DMRS, and SSB are mapped. In the frequency domain, CSI-RS can be configured for the entire bandwidth, a portion of the bandwidth (BWP), or a portion of the bandwidth. CSI-RS may be transmitted in each RB within the bandwidth for which CSI-RS is configured (i.e., density = 1), or in every second RB (e.g., even or odd RB) (i.e., density = 1 / 2). When CSI-RS is used as a Tracking Reference Signal (TRS), a single-port CSI-RS may be mapped on three subcarriers in each resource block (i.e., density = 3). One or more CSI-RS resource sets may be configured for a UE in the time domain. Each CSI-RS resource set may include one or more CSI-RS configurations. Each CSI-RS resource set may be configured periodically, semi-persistently, or aperiodicly.

[0130] - The CSI report configuration may include configurations for feedback type, measurement resources, report type, etc. The NZP-CSI-RS resource set may be used for the CSI report configuration of the corresponding terminal. The NZP-CSI-RS resource set may be associated with CSI-RS or SSB. In addition, multiple periodic NZP-CSI-RS resource sets may be configured as TRS resource sets. (i) The feedback type may include a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), an SSB Resource block Indicator (SSBRI), a Layer Indicator (LI), a Rank Indicator (RI), a Layer 1-Reference Signal Received Strength (RSRP), etc. (ii) Measurement resources may include configurations for downlink signals and / or downlink resources on which the terminal performs measurements to determine feedback information. The measurement resources may be configured as ZP and / or NZP CSI-RS resource sets associated with CSI reporting configurations. The NZP CSI-RS resource set may include a CSI-RS set or an SSB set. For example, L1-RSRP may be measured for a CSI-RS set or an SSB set. (iii) Reporting types may include configurations for a time point at which the terminal performs reporting and an uplink channel, etc. The reporting time point may be configured as periodic, semi-persistent, or aperiodic. Periodic CSI reporting may be transmitted on PUCCH. Semi-persistent CSI reporting may be transmitted on PUCCH or PUSCH based on a MAC CE indicating activation / deactivation. Aperiodic CSI reporting may be indicated by DCI signaling.For example, the CSI request field of an uplink grant may indicate one of several report trigger sizes. Aperiodic CSI reports may be transmitted on the PUSCH.

[0131] The terminal measures CSI based on configuration information related to CSI. CSI measurement may include a procedure of receiving a CSI-RS (720) and computing the received CSI-RS to acquire CSI (730).

[0132] The UE can transmit a CSI report to the base station (740). For the CSI report, the time and frequency resources that the UE can use are controlled by the base station. The CSI (channel state information) can include at least one of a channel quality indicator (CQI), a precoding matrix indicator (PMI), a CSI-RS resource indicator (CRI), an SS / PBCH block resource indicator (SSBRI), a layer indicator (LI), a rank indicator (RI), L1-RSRP, and / or L-SINR.

[0133] The time domain behavior of CSI reporting supports periodic, semi-persistent, and aperiodic. i) Periodic CSI reporting is performed on short PUCCH and long PUCCH. The periodicity and slot offset of periodic CSI reporting can be configured by RRC, and refer to the CSI-ReportConfig IE. ii) SP (semi-periodic) CSI reporting is performed on short PUCCH, long PUCCH, or PUSCH. In case of SP CSI on short / long PUCCH, the periodicity and slot offset are configured by RRC, and CSI reporting is activated / deactivated by separate MAC CE / DCI. In case of SP CSI on PUSCH, the periodicity of SP CSI reporting is configured by RRC, but the slot offset is not configured by RRC, and SP CSI reporting is activated / deactivated by DCI (format 0_1). For SP CSI reporting on PUSCH, a separate RNTI (SP-CSI C-RNTI) is used. The initial CSI reporting timing follows the PUSCH time domain allocation value indicated in the DCI, and subsequent CSI reporting timings follow the cycle set by RRC. DCI format 0_1 ​​includes a CSI request field and can activate / deactivate a specific configured SP-CSI trigger state. SP CSI reporting has the same or similar activation / deactivation mechanism as the data transmission mechanism on the SPS PUSCH.iii) Aperiodic CSI reporting is performed on PUSCH and is triggered by DCI. In this case, information related to the triggering of aperiodic CSI reporting can be transmitted / indicated / configured via MAC-CE. For AP CSI with AP CSI-RS, the AP CSI-RS timing is configured by RRC, and the timing for AP CSI reporting is dynamically controlled by DCI.

[0134] QCL (quasi-co location)

[0135] Two antenna ports are quasi-co-located if the channel properties of one antenna port can be inferred from the channel properties of the other antenna port. The channel properties may include one or more of Delay spread, Doppler spread, Frequency / Doppler shift, Average received power, Received Timing / average delay, and Spatial RX parameters.

[0136] A terminal can configure a list of multiple TCI-State configurations via the upper layer parameter PDSCH-Config. Each TCI-State is associated with one or two DL reference signals and a QCL configuration parameter between the DM-RS port of the PDSCH. The QCL can include qcl-Type1 for the first DL RS and qcl-Type2 for the second DL RS. The QCL type can correspond to one of the following:

[0137] - 'QCL-TypeA': {Doppler shift, Doppler spread, average delay, delay spread}

[0138] - 'QCL-TypeB': {Doppler shift, Doppler spread}

[0139] - 'QCL-TypeC': {Doppler shift, average delay}

[0140] - 'QCL-TypeD': {Spatial Rx parameter}

[0141] M-TRP (multiple-transmission / reception point) related operations

[0142] Figure 8 illustrates multi-TRP transmission. Referring to Figure 8(a), groups of layers transmitting the same CW (codeword) (or TB) correspond to different TRPs. Referring to Figure 8(b), different CWs are transmitted through layer groups of different TRPs. At this time, it can be assumed that the TBs corresponding to CW #1 and CW #2 in the figure are identical. That is, CW #1 and CW #2 each mean that the same TB is converted into different CWs through channel coding, etc. by different TRPs. Therefore, it can be viewed as an example of repeated transmission of the same TB. In the case of Figure 8(b), compared to Figure 8(a), it may have the disadvantage of a high code rate corresponding to the TB. However, it has the advantage of being able to adjust the code rate or control the modulation order of each CW by indicating different RV (redundancy version) values ​​for encoded bits generated from the same TB depending on the channel environment.

[0143] According to the method exemplified in Figures 8(a) and 8(b), the same TB is repeatedly transmitted through different layer groups, and since each layer group is transmitted by a different TRP / panel, the data reception probability of the terminal can be increased. This is referred to as an SDM (Spatial Division Multiplexing)-based M-TRP URLLC transmission method. Layers belonging to different layer groups are transmitted through DMRS ports belonging to different DMRS CDM groups.

[0144] In addition, although the above-described multiple TRP related content was explained based on the SDM (spatial division multiplexing) method using different layers, it can be extended and applied to the FDM (frequency division multiplexing) method based on different frequency domain resources (e.g., RB / PRB (set) etc.) and / or the TDM (time division multiplexing) method based on different time domain resources (e.g., slots, symbols, sub-symbols etc.).

[0145] MTRP URLLC

[0146] In the methods proposed below, DL MTRP-URLLC means that multiple TRPs transmit the same data / DCI using different layer / time / frequency resources. For example, TRP 1 transmits the same data / DCI on resource 1, and TRP 2 transmits the same data / DCI on resource 2. A UE configured with the DL MTRP-URLLC transmission method receives the same data / DCI using different layer / time / frequency resources. At this time, the UE is instructed by the base station which QCL RS / type (i.e., DL TCI state) to use in the layer / time / frequency resource where the same data / DCI is received. For example, if the same data / DCI is received on resource 1 and resource 2, the UE is instructed which DL TCI state is used on resource 1 and which DL TCI state is used on resource 2. Since the UE receives the same data / DCI through both resource 1 and resource 2, high reliability can be achieved. This DL MTRP URLLC can be applied to PDSCH / PDCCH.

[0147] Conversely, UL MTRP-URLLC means that multiple TRPs receive the same data / UCI from a UE using different layer / time / frequency resources. For example, TRP 1 receives the same data / DCI from the UE on resource 1, and TRP 2 receives the same data / DCI from the UE on resource 2, and then shares the received data / DCI through the connected backhaul link between the TRPs. A UE configured with the UL MTRP-URLLC transmission method transmits the same data / UCI using different layer / time / frequency resources. At this time, the UE is instructed by the base station which Tx beam and which Tx power (i.e., UL TCI state) to use in the layer / time / frequency resource transmitting the same data / UCI. For example, if the same data / UCI is transmitted on resource 1 and resource 2, the UE is instructed on the UL TCI state used on resource 1 and the UL TCI state used on resource 2. This UL MTRP URLLC can be applied to PUSCH / PUCCH.

[0148] In addition, in the methods proposed below, using (mapping) a specific TCI state (or TCI) when receiving data / DCI / UCI for a certain frequency / time / spatial resource can mean that, in the case of DL, a channel is estimated from DMRS using the QCL type and QCL RS indicated by the corresponding TCI state in the frequency / time / spatial resource, and data / DCI is received / demodulated with the estimated channel. In the case of UL, it can mean that DMRS and data / UCI are transmitted / modulated using the Tx beam and / or Tx power indicated by the corresponding TCI state in the frequency / time / spatial resource.

[0149] The above UL TCI state contains Tx beam or Tx power information of the UE, and may be set to the UE through other parameters such as spatial relation info instead of the TCI state. The UL TCI state may be directly indicated in the UL grant DCI, or may mean spatial relation info of the SRS resource indicated through the SRI field of the UL grant DCI. Or, it may mean the OL Tx power control parameter ( j: index for open loop parameters Po & alpha (maximum 32 parameter value sets per cell), q_d: index of DL RS resource for PL measurement (maximum 4 measurements per cell), l: closed loop power control process index (maximum 2 processes per cell) ) linked to the value indicated through the SRI field of the UL grant DCI.

[0150] On the other hand, MTRP-eMBB means that different data is transmitted using different layers / time / frequency of Multiple TRPs, and a UE configured with the MTRP-eMBB transmission method is instructed to multiple TCI states by DCI, and it is assumed that the data received using the QCL RS of each TCI state is different data.

[0151] Additionally, the UE can determine whether it is MTRP URLLC transmission / reception or MTRP eMBB transmission / reception by using the RNTI for MTRP-URLLC and the RNTI for MTRP-eMBB separately. That is, if the RNTI for URLLC is used and the DCI is CRC masked, it is identified as URLLC transmission, and if the RNTI for eMBB is used and the DCI is CRC masked, it is identified as eMBB transmission. Alternatively, the base station can configure MTRP URLLC transmission / reception or MTRP eMBB transmission / reception to the UE through other new signaling.

[0152] For convenience of explanation, this specification assumes cooperative transmission / reception between two TRPs and applies the proposed method. However, it can also be applied to multi-TRP environments with three or more TRPs, and can be expanded to multi-panel environments. Different TRPs can be recognized by the UE as different TCI states, and when the UE receives / transmits data / DCI / UCI using TCI state 1, it means that the data / DCI / UCI has been received / transmitted from / to TRP 1.

[0153] The proposals in this specification can be utilized in situations where MTRP performs cooperative transmission of PDCCH (repeated transmission or divided transmission of the same PDCCH), and some of the proposals can also be utilized in situations where MTRP performs cooperative transmission of PDSCH or cooperative reception of PUSCH / PUCCH.

[0154] In addition, in the following, the meaning that multiple base stations (i.e. MTRP) repeatedly transmit the same PDCCH may mean that the same DCI was transmitted through multiple PDCCH candidates, and is the same as the meaning that multiple base stations repeatedly transmit the same DCI. The same DCI may mean two DCIs with the same DCI format / size / payload. Alternatively, even if the payloads of two DCIs are different, they can be said to be the same DCI if the scheduling results are the same. For example, the TDRA (time domain resource allocation) field of the DCI relatively determines the slot / symbol positions of the data and the slot / symbol positions of the A / N based on the time point of reception of the DCI. If the DCI received at time n and the DCI received at time n+1 inform the UE of the same scheduling result, the TDRA fields of the two DCIs will be different, and consequently, the DCI payloads will inevitably be different. The number of repetitions R can be directly indicated by the base station to the UE or can be mutually agreed upon. Or, even if the payloads of two DCIs are different and the scheduling results are not the same, if the scheduling result of one DCI is a subset of the scheduling result of the other DCI, they can be said to be the same DCI. For example, if the same data is TDMed and repeatedly transmitted N times, DCI 1 received before the first data indicates data repetition N times, and DCI 2 received after the first data and before the second data indicates data repetition N-1 times. The scheduling data of DCI 2 becomes a subset of the scheduling data of DCI 1, and since both DCIs are scheduling for the same data, they can also be said to be the same DCI in this case.

[0155] Also, in the following, the meaning that multiple base stations (i.e., MTRPs) divide and transmit the same PDCCH may mean, for example, that one DCI is transmitted through one PDCCH candidate, but some resources for which the PDCCH candidate is defined are transmitted by TRP 1 and the remaining resources are transmitted by TRP 2. For example, when TRP 1 and TRP 2 divide and transmit a PDCCH candidate corresponding to an aggregation level m1+m2, the PDCCH candidate is divided into PDCCH candidate 1 corresponding to an aggregation level m1 and PDCCH candidate 2 corresponding to an aggregation level m2, and TRP 1 transmits PDCCH candidate 1 and TRP 2 transmits PDCCH candidate 2 using different time / frequency resources. After receiving PDCCH candidate 1 and PDCCH candidate 2, the UE generates a PDCCH candidate corresponding to an aggregation level m1+m2 and attempts DCI decoding.

[0156] Meanwhile, there may be two implementation methods when the same DCI is transmitted by dividing it into multiple PDCCH candidates.

[0157] First, the DCI payload (control information bits + CRC) is encoded through a single channel encoder (e.g., polar encoder), and the resulting coded bits are divided and transmitted by two TRPs. In this case, the coded bits transmitted by each TRP may encode the entire DCI payload or only a portion of the DCI payload. The second method divides the DCI payload (control information bits + CRC) into two (DCI 1 and DCI 2), and each is encoded through a channel encoder (e.g., polar encoder). Afterwards, the two TRPs transmit the coded bits corresponding to DCI 1 and the coded bits corresponding to DCI 2, respectively.

[0158] Whether the PDCCH is transmitted repeatedly or in segments, it can be understood that the PDCCH is transmitted multiple times across multiple Transmission Occasions (i.e., TOs), where TOs represent specific time / frequency resource units in which the PDCCH is transmitted. For example, if the PDCCH is transmitted multiple times across slots 1, 2, 3, and 4 (to specific RBs), TOs can represent each slot. If the PDCCH is transmitted multiple times across RB sets 1, 2, 3, and 4 (in specific slots), TOs can represent each RB set. Alternatively, if the PDCCH is transmitted multiple times across different times and frequencies, TOs can represent each time / frequency resource. In addition, the TCI state used for DMRS channel estimation may be set differently for each TO, and TOs with different TCI states can be assumed to have been transmitted by different TRPs / panels. When multiple base stations transmit a PDCCH repeatedly or in segments, it means that the PDCCH is transmitted across multiple TOs, and the union of the TCI states set for the TOs consists of two or more TCI states. For example, if a PDCCH is transmitted across TOs 1, 2, 3, and 4, TCI states 1, 2, 3, and 4 may be set for TOs 1, 2, 3, and 4 respectively, which means that TRP i cooperatively transmitted the PDCCH on TO i.

[0159] Also, in the following, when a UE repeatedly transmits the same PUSCH so that multiple base stations (i.e., MTRPs) can receive it, it may mean that the same data is transmitted through multiple PUSCHs, and each PUSCH may be optimized for a UL channel of a different TRP. For example, when a UE repeatedly transmits the same data through PUSCH 1 and 2, PUSCH 1 is transmitted using UL TCI state 1 for TRP 1, and link adaptation such as precoder / MCS is also scheduled and transmitted with values ​​optimized for the channel of TRP 1. PUSCH 2 is transmitted using UL TCI state 2 for TRP 2, and link adaptation such as precoder / MCS is also scheduled and transmitted with values ​​optimized for the channel of TRP 2. In this case, the repeatedly transmitted PUSCHs 1 and 2 may be transmitted at different times and may be TDM, FDM, or SDM.

[0160] Also, below, the UE dividing and transmitting the same PUSCH so that multiple base stations (i.e. MTRPs) can receive it means that one data can be transmitted through one PUSCH, but the resources allocated to the PUSCH can be split and transmitted in an optimized manner on the UL channels of different TRPs. For example, if the UE transmits the same data through a 10-symbol PUSCH, the first 5 symbols are transmitted using UL TCI state 1 for TRP 1, and link adaptations such as precoder / MCS are also scheduled and transmitted with values ​​optimized for the channel of TRP 1. The remaining 5 symbols are transmitted using UL TCI state 2 for TRP 2, and link adaptations such as precoder / MCS are also scheduled and transmitted with values ​​optimized for the channel of TRP 2. In the above example, one PUSCH is divided into time resources and transmission toward TRP 1 and transmission toward TRP 2 is TDM, but it can also be transmitted in FDM / SDM manner.

[0161] Similar to PUSCH transmission, PUCCH can also be transmitted repeatedly by the UE for reception by multiple base stations (i.e. MTRP) or by dividing the same PUCCH.

[0162] Codebook-based uplink frequency-selective precoding

[0163] In future standards (e.g., Rel-19 NR MIMO or later standards), individual / independent precoding (hereinafter referred to as subband precoding) may be applied to each subband (SB) included in the entire transmission frequency band for UL PUSCH transmission. That is, in the current standard, UL PUSCH only supports wideband (WB) precoding in which the same precoder (e.g., precoding matrix, PMI) is applied to all scheduled RBs, but in the future, different precodings may be supported for each SB. As a result, UL precoding optimized for each SB becomes possible in a frequency selective channel, and higher UL throughput can be achieved. A frequency selective channel can refer to a wireless channel in which channel characteristics, including interference, appear diverse / different depending on each frequency location.

[0164] To this end, the following methods are proposed for a method in which a base station instructs a UE to select a precoder for each SB to be applied to codebook-based PUSCH transmission.

[0165] 1. Proposal 1

[0166] Existing codebooks (codebooks organized by each rank) (e.g., uplink 2Tx, 4Tx, 8Tx codebooks of TS 38.211) can be grouped into multiple codebook groups. Groups are indicated by WB attributes through group indicators, and TRI / TPMI can be indicated for each SB within the indicated group through the group indicator.

[0167] Fig. 9 illustrates an example of codebook grouping according to Proposal 1. For convenience of explanation, Fig. 9 illustrates grouping into five groups based on the NR 2-Tx UL codebooks in Tables 6 and 9; however, the application of Proposal 1 is not limited thereto and can be applied to various other codebooks and group configurations.

[0168] The group indicator can indicate one of five groups. If the base station indicates group 2 through the group indicator and the number of scheduled SBs configured / indicated for uplink transmission is 3, the PMI to be used for UL transmission can be indicated within group 2 through 1 bit per SB.

[0169] DCI can be composed of one group indicator (WB indicator) field and N SB TPMI indicator fields for N scheduled SBs. In the example of Fig. 9, 3 bits are required for the group indicator and 1 bit is required for each of the 3 SBs, so a total of 3+1*3=6 bits are required for the 2Tx SB precoding indication.

[0170] In the above example, codebook grouping is applied across multiple ranks, and the group indicator can be used to indicate TRI.

[0171] The SB TPMI indicator can be determined based on the number of TPMIs in the group containing the most TPMIs. In the example of Fig. 9, since the number of TPMIs per group is 1 or 2, the SB TPMI indicator can be configured as 1 bit. If the number of TPMIs in groups 1 / 2 / 3 is 2 / 3 / 4 respectively, the size of the field of the SB TPMI indicator can be determined as 2 bits based on 4.

[0172] Alternatively, the maximum field size of SB precoder indicators in the DCI is determined based on the number of group indicators and / or the maximum TPMI number in each group as described above, but the actual field size may be determined based on the group indicator. For example, in the example where the number of TPMIs in groups 1 / 2 / 3 is 2 / 3 / 4, the max DCI size is based on the number of TPMIs in group 3, which is 4, but the actual field size is based on the group indicator. For example, if the group indicator indicates 1, the size of each SB TPMI field becomes 1 bit, and if the group indicator indicates 2 or 3, the size of each SB TPMI field becomes 2 bits. If the actual SB TPMI field(s) is smaller than the size of the max SB TPMI field(s) in the DCI, the remaining bits may be reserved bits or zero-paded to improve DCI decoding performance.

[0173] In another embodiment, a per rank SB TPMI indicator may be considered, in which case, a TRI field + group indicator field + N * SB TPMI indicator fields may be indicated / set in the DCI for TPMI indication. Here, the size of the group indicator field is determined by the maximum number of groups for each rank. In the example of FIG. 9, groups 1, 2, and 3 are rank 1, and groups 4 and 5 are rank 2. Therefore, the field size of the group indicator is determined to be 2 bits based on 3, which is the number of groups corresponding to rank 1. In addition, the SB TPMI indicator is determined based on the largest value of the number of TPMIs in each group. In the example of FIG. 9, since the number of TPMIs per group is 1 or 2, the SB TPMI indicator may be 1 bit. If the number of TPMIs of groups 1 / 2 / 3 are 2 / 3 / 4 respectively, the SB TPMI indicator can be determined as 2 bits based on 4. Alternatively, the examples and max payload described above are determined based on the number of group indicators per rank and / or the number of TPMIs per group, but the actual SB TPMI indicator field can also be determined based on the TRI and group indicators. If the actual SB TPMI indicator field(s) is(are) smaller than the size of the max SB TPMI indicator field(s) in the DCI, the remaining bits can be reserved bits or zero-paded to improve DCI decoding performance.

[0174] As another implementation example of Proposal 1, a sliding window method can be used. In this method, the reference point (starting index) is set / indicated as a WB component, and the TPMIs within a specific window are indicated by SB from the reference point. The reference point (starting index) can be set for each rank or across ranks. In the case of across ranks, the reference point (starting index) can be indicated / set using a value obtained by accumulating and re-indexing the codebooks of all ranks.

[0175] As an example, Table 13 is a table indicating the TPMI and layer (rank) of the 2-Tx codebook in the NR standard document TS 38.212. Table 13 can be used for transmission through the 2Tx antenna port when transform precoding is disabled, the maximum rank is set to 2, and ul-FullPowerTransmission is not set or fullpowerMode2 / fullpower is set. In this case, the interpretation of the Precoding information and number of layers bit field values ​​in the DCI is based on Table 13. In Table 13, 1 layer, TPMI=x can mean TPMI=x in Table 6, and 2 layers, TPMI=x can mean TPMI=x in Table 9.

[0176] Bit fields mapped to indices codebookSubset=fullyAndPartialAndNonCoherent Bit fields mapped to indices codebookSubset=nonCoherent 01 layer: TPMI=001 layer: TPMI=011 layer: TPMI=111 layer: TPMI=122 layers: TPMI=022 layers: TPMI=031 layer: TPMI=23reserved 41 layer: TPMI=351 layer: TPMI=461 layer: TPMI=572 layers: TPMI=182 layers: TPMI=29-15reserved

[0177] Meanwhile, in the case of the codebook in Table 13, the rank and codebook subset are mixed and indexed due to the coherency codebook subset. For Proposal 1, re-indexing as in Tables 14 and 15 can be considered.

[0178] Table 14 is an example of codebook indexing performed across multiple ranks.

[0179] Bit fields mapped to indices codebookSubset=fullyAndPartialAndNonCoherent Bit fields mapped to indices codebookSubset=nonCoherent 01 layer: TPMI=001 layer: TPMI=011 layer: TPMI=111 layer: TPMI=121 layer: TPMI=222 layers: TPMI=031 layer: TPMI=33reserved 41 layer: TPMI=451 layer: TPMI=562 layers: TPMI=072 layers: TPMI=182 layers: TPMI=29-15reserved

[0180] Table 15 is an example of codebook indexing for each rank.

[0181] Bit field mapped to index codebookSubset=fullyAndPartialAndNonCoherent Bit field mapped to index codebookSubset=nonCoherent 01 layer: TPMI=001 layer: TPMI=011 layer: TPMI=111 layer: TPMI=121 layer: TPMI=202 layers: TPMI=031 layer: TPMI=31reserved 41 layer: TPMI=451 layer: TPMI=502 layers: TPMI=012 layers: TPMI=122 layers: TPMI=2

[0182] The above window can be a value set by the base station, a value determined by a specific rule, a value agreed upon in advance, or a value reported as terminal capability. Furthermore, the window can be a consecutive window or a distributed window separated by a specific pattern or offset. Information regarding these windows can also be agreed upon in advance or set by the base station.

[0183] Figure 10 illustrates an example of a sliding window method. The start index is used to indicate the TPMI within the entire specified codebook. In Figure 10, the step size is 1 and the window size is 4.

[0184] For example, in the case of Fig. 10, a field for indicating a start index and 2 bits for indicating TPMI within a window for each N SB may be required. When operating in rank-specific mode, a separate TRI field may be required to indicate the rank. When operating across ranks, TRI may be indicated jointly with the start index indication.

[0185] Figure 11 illustrates another example of the sliding window method. When the step size is set to a small value, such as 1, the start index instruction incurs a large amount of payload / overhead. Therefore, the step size can be set to a large value. Figure 11 illustrates a case where the step size is set to 2, but the step size can be set to various other values.

[0186] Figure 12 illustrates another example of the sliding window method. While Figures 10 and 11 illustrate cases where the window is a consecutive window, a non-consecutive window, as in Figure 12, may also be used. In Figure 12, an offset value (either set by the base station or agreed upon in advance) between elements within the window can be used to instruct the SB precoder. Using a non-consecutive window has the advantage of being suitable for channel environments with low correlation between SBs, compared to the consecutive window method as in Figures 10 and 11.

[0187] In FIGS. 10, 11, and 12, if the window is set beyond the last TPMI index, indexing is performed again from the first TPMI after the last TPMI index. In other words, indexing is performed from the beginning through a modulo operation based on the total number of TPMI indices. For example, in FIG. 10, if there are a total of 8 TPMIs and the start index indicates 6, a window of size 5 is set across TPMIs of 6, 7, 0, and 1.

[0188] For the above SB precoders, they can be applied to each codebook subset based on the terminal's coherency capability (e.g., full, partial, non-coherent). Alternatively, in Proposal 1, the TPMI grouping can be configured / applied by grouping the TPMIs by coherency, i.e., full coherent codebook, partial coherent codebook, and non-coherent codebook.

[0189] 2. Proposal 2

[0190] A specific reference SB is indicated as a conventional WB precoder instruction, and the instructions of the precoder corresponding to the remaining SBs can be indicated as differential values ​​from the reference SB.

[0191] Fig. 13 is an example of TPMI signaling per SB based on Proposal 2. In Fig. 13, the reference SB is assumed to be the first SB, and the location of this reference SB can be pre-arranged or configured by the base station. If pre-arranged, it can be the first SB or an intermediate SB, as shown in Fig. 13. That is, the reference SB can be determined as the 1st SB, the ceiling (N / 2)th SB, or the floor (N / 2)th SB, where the value of N is the number of scheduled / configured SBs. In addition, the granularity of the differential indicator can also be pre-arranged or configured by the base station.

[0192] Tables 16 and 17 show examples of 1-bit and 2-bit differential indications, respectively. Proposal 2 has the advantage of not having a WB TPMI indicator. For SB 1, as with legacy, TRI / TPMI can be jointly indicated, and for the remaining (N-1) SBs, a differential TPMI index can be indicated / set based on the number of bits in the table below. In the example of Fig. 13, the TPMI index of SB2 is 8, and the TPMI index of SB3 is 5.

[0193] Differential indexvalue001+1

[0194] Differential indexvalue0-1102+13+2

[0195] Another implementation example of Proposal 2 is a method in which, instead of individually indicating the SB index of the differential, the base station sets multiple patterns agreed upon in advance, such as through RRC, and indicates the pattern values ​​for these.

[0196] For example, in the example of Fig. 13, the patterns of SB2 and SB3 can be set in advance as 00 / 01 / 02 / 12, etc., and printed as DCI to reduce DCI overhead. Table 18 shows an example of a 2-bit differential pattern instruction.

[0197] indexSB2 / SB3 value00 / 010 / 120 / +23+1 / +2

[0198] (1) Proposal 2-1

[0199] Similar to the UL precoder indication for MTRP, multiple TPMI fields can be provided, each field mapped to a respective SB, and used for indicating the same. However, the first TPMI field indicates the TRI / TPMI index corresponding to the reference SB, as in Proposal 2, and the remaining fields 2 through N-1 only indicate TPMIs assuming the same rank as the TRI corresponding to the reference SB. For Proposal 2 / 2-1, re-indexing of the TPMI can be considered, similar to Table 14 / Table 15 of Proposal 1.

[0200] In Proposal 2-1, the sizes of the 2nd to N-1th fields are determined based on the rank with the largest TPMI for each rank. For example, in the example of 2Tx above, where rank 1 has a TPMI of 6 and rank 2 has a TPMI of 3, the sizes of each field are determined in 3-bit increments based on rank 1.

[0201] Although the above methods are explained based on the SB precoding setting method of the single DCI method, they can also be applied to a structure in which the WB precoder is set / instructed to the first DCI and the SB precoder is set / instructed to the second DCI.

[0202] For Proposal 1 / 2 / 2-1, the terminal can report the maximum support # of SBs to the base station as a capability.

[0203] Proposals 1 / 2 / 2-1 may be implemented singly or in combination.

[0204] Fig. 14 illustrates an implementation example of the operation of a terminal in a wireless communication system according to one embodiment.

[0205] Referring to FIG. 14, the terminal can receive DCI (downlink control information) for uplink scheduling (1405).

[0206] The terminal can transmit an uplink signal based on at least one codebook in a frequency band allocated through DCI (1410).

[0207] The PMI (precoding matrix information) included in at least one codebook above can be grouped into multiple PMI groups.

[0208] The DCI may include i) a first field for assigning a specific PMI group among the plurality of PMI groups to the frequency band, and ii) a second field for assigning a PMI within the specific PMI group for each subband of the frequency band.

[0209] Through the second field above, PMI can be individually assigned to each sub-band.

[0210] All PMIs assigned to sub-bands of the above frequency band may be related to the same rank.

[0211] The above second field can provide differential PMI information based on the PMI of a reference sub-band among the sub-bands of the frequency band.

[0212] The above reference sub-band may be set or predefined via higher layer signaling.

[0213] The size of the first field may be determined based on the total number of the plurality of PMI groups.

[0214] The size of the second field may be determined based on a PMI group that includes the largest number of PMIs among the plurality of PMI groups.

[0215] The above second field can assign a PMI to each sub-band through any one of the PMI patterns configured within the above specific PMI group.

[0216] FIG. 15 illustrates an implementation example of the operation of a base station in a wireless communication system according to one embodiment.

[0217] Referring to FIG. 15, the base station can transmit DCI (downlink control information) for uplink scheduling (1505).

[0218] The base station can receive an uplink signal based on at least one codebook in a frequency band allocated through the DCI (1510).

[0219] The PMI (precoding matrix information) included in at least one codebook above can be grouped into multiple PMI groups.

[0220] The DCI may include i) a first field for assigning a specific PMI group among the plurality of PMI groups to the frequency band, and ii) a second field for assigning a PMI within the specific PMI group for each subband of the frequency band.

[0221] Through the second field above, PMI can be individually assigned to each sub-band.

[0222] All PMIs assigned to sub-bands of the above frequency band may be related to the same rank.

[0223] The above second field can provide differential PMI information based on the PMI of a reference sub-band among the sub-bands of the frequency band.

[0224] The above reference sub-band may be set or predefined via higher layer signaling.

[0225] The size of the first field may be determined based on the total number of the plurality of PMI groups.

[0226] The size of the second field may be determined based on a PMI group that includes the largest number of PMIs among the plurality of PMI groups.

[0227] The above second field can assign a PMI to each sub-band through any one of the PMI patterns configured within the above specific PMI group.

[0228] Fig. 16 illustrates a communication system (1) applicable to this embodiment.

[0229] Referring to FIG. 16, a communication system (1) includes a wireless device, a base station, and a network. Here, the wireless device refers to a device that performs communication using a wireless access technology (e.g., 5G NR (New RAT), LTE (Long Term Evolution)) and may be referred to as a communication / wireless / 5G device. Although not limited thereto, the wireless device may include a robot (100a), a vehicle (100b-1, 100b-2), an XR (eXtended Reality) device (100c), a hand-held device (100d), a home appliance (100e), an IoT (Internet of Things) device (100f), and an AI device / server (400). For example, the vehicle may include a vehicle equipped with a wireless communication function, an autonomous vehicle, a vehicle capable of performing vehicle-to-vehicle communication, etc. Here, the vehicle may include an Unmanned Aerial Vehicle (UAV) (e.g., a drone). XR devices include AR (Augmented Reality) / VR (Virtual Reality) / MR (Mixed Reality) devices, and can be implemented in the form of HMD (Head-Mounted Device), HUD (Head-Up Display) installed in a vehicle, television, smartphone, computer, wearable device, home appliance, digital signage, vehicle, robot, etc. Mobile devices can include smartphone, smart pad, wearable device (e.g., smart watch, smart glass), computer (e.g., laptop, etc.), etc. Home appliances can include TV, refrigerator, washing machine, etc. IoT devices can include sensors, smart meters, etc. For example, base stations and networks can also be implemented as wireless devices, and a specific wireless device (200a) can act as a base station / network node to other wireless devices.

[0230] Wireless devices (100a to 100f) can be connected to a network (300) via a base station (200). Artificial Intelligence (AI) technology can be applied to the wireless devices (100a to 100f), and the wireless devices (100a to 100f) can be connected to an AI server (400) via the network (300). The network (300) can be configured using a 3G network, a 4G (e.g., LTE) network, a 5G (e.g., NR) network, etc. The wireless devices (100a to 100f) can communicate with each other via the base station (200) / network (300), but can also communicate directly (e.g., sidelink communication) without going through the base station / network. For example, vehicles (100b-1, 100b-2) can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to Everything) communication). In addition, IoT devices (e.g., sensors) can communicate directly with other IoT devices (e.g., sensors) or other wireless devices (100a to 100f).

[0231] Wireless communication / connection (150a, 150b, 150c) can be established between wireless devices (100a~100f) / base stations (200), and base stations (200) / base stations (200). Here, wireless communication / connection can be achieved through various wireless access technologies (e.g., 5G NR) such as uplink / downlink communication (150a), sidelink communication (150b) (or D2D communication), and communication between base stations (150c) (e.g., relay, IAB (Integrated Access Backhaul). Through wireless communication / connection (150a, 150b, 150c), wireless devices and base stations / wireless devices, and base stations and base stations can transmit / receive wireless signals to each other. For example, wireless communication / connection (150a, 150b, 150c) can transmit / receive signals through various physical channels. To this end, at least some of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel encoding / decoding, modulation / demodulation, resource mapping / demapping, etc.), and resource allocation processes can be performed based on various proposals of the present invention.

[0232] Fig. 17 illustrates a wireless device that can be applied to this embodiment.

[0233] Referring to FIG. 17, the first wireless device (100) and the second wireless device (200) can transmit and receive wireless signals through various wireless access technologies (e.g., LTE, NR). Here, {the first wireless device (100), the second wireless device (200)} can correspond to {the wireless device (100x), the base station (200)} and / or {the wireless device (100x), the wireless device (100x)} of FIG. 16.

[0234] A first wireless device (100) includes one or more processors (102) and one or more memories (104), and may further include one or more transceivers (106) and / or one or more antennas (108). The processor (102) controls the memories (104) and / or the transceivers (106), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (102) may process information in the memory (104) to generate first information / signal, and then transmit a wireless signal including the first information / signal via the transceiver (106). In addition, the processor (102) may receive a wireless signal including second information / signal via the transceiver (106), and then store information obtained from signal processing of the second information / signal in the memory (104). The memory (104) may be connected to the processor (102) and may store various information related to the operation of the processor (102). For example, the memory (104) may perform some or all of the processes controlled by the processor (102), or may store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor (102) and the memory (104) may be part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver (106) may be connected to the processor (102) and may transmit and / or receive wireless signals via one or more antennas (108). The transceiver (106) may include a transmitter and / or a receiver. The transceiver (106) may be used interchangeably with an RF (Radio Frequency) unit. In the present invention, a wireless device may also mean a communication modem / circuit / chip.

[0235] The second wireless device (200) includes one or more processors (202), one or more memories (204), and may further include one or more transceivers (206) and / or one or more antennas (208). The processor (202) controls the memories (204) and / or the transceivers (206), and may be configured to implement the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document. For example, the processor (202) may process information in the memory (204) to generate third information / signals, and then transmit a wireless signal including the third information / signals via the transceivers (206). Furthermore, the processor (202) may receive a wireless signal including fourth information / signals via the transceivers (206), and then store information obtained from signal processing of the fourth information / signals in the memory (204). The memory (204) may be connected to the processor (202) and may store various information related to the operation of the processor (202). For example, the memory (204) may perform some or all of the processes controlled by the processor (202), or may store software code including commands for performing the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. Here, the processor (202) and the memory (204) may be part of a communication modem / circuit / chip designed to implement wireless communication technology (e.g., LTE, NR). The transceiver (206) may be connected to the processor (202) and may transmit and / or receive wireless signals via one or more antennas (208). The transceiver (206) may include a transmitter and / or a receiver. The transceiver (206) may be used interchangeably with an RF unit. In the present invention, a wireless device may also mean a communication modem / circuit / chip.

[0236] Hereinafter, the hardware elements of the wireless device (100, 200) will be described in more detail. Although not limited thereto, one or more protocol layers may be implemented by one or more processors (102, 202). For example, one or more processors (102, 202) may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). One or more processors (102, 202) may generate one or more Protocol Data Units (PDUs) and / or one or more Service Data Units (SDUs) according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) may generate messages, control information, data, or information according to the descriptions, functions, procedures, proposals, methods, and / or operation flowcharts disclosed in this document. One or more processors (102, 202) can generate signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, proposals and / or methods disclosed herein, and provide the signals to one or more transceivers (106, 206). One or more processors (102, 202) can receive signals (e.g., baseband signals) from one or more transceivers (106, 206) and obtain PDUs, SDUs, messages, control information, data or information according to the descriptions, functions, procedures, proposals, methods and / or operational flowcharts disclosed herein.

[0237] One or more processors (102, 202) may be referred to as a controller, a microcontroller, a microprocessor, or a microcomputer. One or more processors (102, 202) may be implemented by hardware, firmware, software, or a combination thereof. For example, one or more Application Specific Integrated Circuits (ASICs), one or more Digital Signal Processors (DSPs), one or more Digital Signal Processing Devices (DSPDs), one or more Programmable Logic Devices (PLDs), or one or more Field Programmable Gate Arrays (FPGAs) may be included in one or more processors (102, 202). The descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, etc. The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software configured to perform one or more processors (102, 202) or stored in one or more memories (104, 204) and executed by one or more processors (102, 202). The descriptions, functions, procedures, suggestions, methods and / or operation flowcharts disclosed in this document may be implemented using firmware or software in the form of codes, instructions and / or sets of instructions.

[0238] One or more memories (104, 204) may be coupled to one or more processors (102, 202) and may store various forms of data, signals, messages, information, programs, codes, instructions, and / or commands. The one or more memories (104, 204) may be configured as ROM, RAM, EPROM, flash memory, hard drives, registers, cache memory, computer-readable storage media, and / or combinations thereof. The one or more memories (104, 204) may be located internally and / or externally to the one or more processors (102, 202). Additionally, the one or more memories (104, 204) may be coupled to the one or more processors (102, 202) via various technologies, such as wired or wireless connections.

[0239] One or more transceivers (106, 206) can transmit user data, control information, wireless signals / channels, etc., as mentioned in the methods and / or flowcharts of this document, to one or more other devices. One or more transceivers (106, 206) can receive user data, control information, wireless signals / channels, etc., as mentioned in the descriptions, functions, procedures, proposals, methods and / or flowcharts of this document, from one or more other devices. For example, one or more transceivers (106, 206) can be connected to one or more processors (102, 202) and can transmit and receive wireless signals. For example, one or more processors (102, 202) can control one or more transceivers (106, 206) to transmit user data, control information, or wireless signals to one or more other devices. Additionally, one or more processors (102, 202) may control one or more transceivers (106, 206) to receive user data, control information, or wireless signals from one or more other devices. Additionally, one or more transceivers (106, 206) may be coupled to one or more antennas (108, 208), and one or more transceivers (106, 206) may be configured to transmit and receive user data, control information, wireless signals / channels, or the like, as referred to in the descriptions, functions, procedures, proposals, methods, and / or operational flowcharts disclosed herein, via one or more antennas (108, 208). In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers (106, 206) can convert received user data, control information, wireless signals / channels, etc. from RF band signals to baseband signals in order to process the received user data, control information, wireless signals / channels, etc. using one or more processors (102, 202).One or more transceivers (106, 206) may convert user data, control information, wireless signals / channels, etc. processed by one or more processors (102, 202) from baseband signals to RF band signals. For this purpose, one or more transceivers (106, 206) may include an (analog) oscillator and / or filter.

[0240] Figure 18 illustrates another example of a wireless device applicable to this embodiment. The wireless device may be implemented in various forms depending on the use case / service (see Figure 16).

[0241] Referring to FIG. 18, the wireless device (100, 200) corresponds to the wireless device (100, 200) of FIG. 17 and may be composed of various elements, components, units / units, and / or modules. For example, the wireless device (100, 200) may include a communication unit (110), a control unit (120), a memory unit (130), and an additional element (140). The communication unit may include a communication circuit (112) and a transceiver(s) (114). For example, the communication circuit (112) may include one or more processors (102, 202) and / or one or more memories (104, 204) of FIG. 17. For example, the transceiver(s) (114) may include one or more transceivers (106, 206) and / or one or more antennas (108, 208) of FIG. 17. The control unit (120) is electrically connected to the communication unit (110), the memory unit (130), and the additional elements (140) and controls the overall operation of the wireless device. For example, the control unit (120) may control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit (130). In addition, the control unit (120) may transmit information stored in the memory unit (130) to an external device (e.g., another communication device) via a wireless / wired interface through the communication unit (110), or store information received from an external device (e.g., another communication device) via a wireless / wired interface in the memory unit (130).

[0242] The additional element (140) may be configured in various ways depending on the type of the wireless device. For example, the additional element (140) may include at least one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computing unit. Although not limited thereto, the wireless device may be implemented in the form of a robot (Fig. 16, 100a), a vehicle (Fig. 16, 100b-1, 100b-2), an XR device (Fig. 16, 100c), a portable device (Fig. 16, 100d), a home appliance (Fig. 16, 100e), an IoT device (Fig. 16, 100f), a digital broadcasting terminal, a hologram device, a public safety device, an MTC device, a medical device, a fintech device (or a financial device), a security device, a climate / environmental device, an AI server / device (Fig. 16, 400), a base station (Fig. 16, 200), a network node, etc. Wireless devices may be mobile or stationary depending on the use / service.

[0243] In FIG. 18, various elements, components, units / parts, and / or modules within the wireless device (100, 200) may be entirely interconnected via a wired interface, or at least some may be wirelessly connected via a communication unit (110). For example, within the wireless device (100, 200), the control unit (120) and the communication unit (110) may be wired, and the control unit (120) and a first unit (e.g., 130, 140) may be wirelessly connected via the communication unit (110). In addition, each element, component, unit / part, and / or module within the wireless device (100, 200) may further include one or more elements. For example, the control unit (120) may be composed of a set of one or more processors. For example, the control unit (120) may be composed of a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing processor, a memory control processor, etc. As another example, the memory unit (130) may be composed of RAM (Random Access Memory), DRAM (Dynamic RAM), ROM (Read Only Memory), flash memory, volatile memory, non-volatile memory, and / or a combination thereof.

[0244] Figure 19 illustrates a vehicle or autonomous vehicle applicable to this embodiment. The vehicle or autonomous vehicle may be implemented as a mobile robot, car, train, manned / unmanned aerial vehicle (AV), ship, etc.

[0245] Referring to FIG. 19, a vehicle or autonomous vehicle (100) may include an antenna unit (108), a communication unit (110), a control unit (120), a driving unit (140a), a power supply unit (140b), a sensor unit (140c), and an autonomous driving unit (140d). The antenna unit (108) may be configured as a part of the communication unit (110). Blocks 110 / 130 / 140a to 140d correspond to blocks 110 / 130 / 140 of FIG. 18, respectively.

[0246] The communication unit (110) can transmit and receive signals (e.g., data, control signals, etc.) with external devices such as other vehicles, base stations (e.g., base stations, road side units, etc.), and servers. The control unit (120) can control elements of the vehicle or autonomous vehicle (100) to perform various operations. The control unit (120) can include an ECU (Electronic Control Unit). The drive unit (140a) can drive the vehicle or autonomous vehicle (100) on the ground. The drive unit (140a) can include an engine, a motor, a power train, wheels, brakes, a steering device, etc. The power supply unit (140b) supplies power to the vehicle or autonomous vehicle (100) and can include a wired / wireless charging circuit, a battery, etc. The sensor unit (140c) can obtain vehicle status, surrounding environment information, user information, etc. The sensor unit (140c) may include an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, an incline sensor, a weight detection sensor, a heading sensor, a position module, a vehicle forward / backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, an illuminance sensor, a pedal position sensor, etc. The autonomous driving unit (140d) may implement a technology for maintaining a driving lane, a technology for automatically controlling speed such as adaptive cruise control, a technology for automatically driving along a set path, a technology for automatically setting a path and driving when a destination is set, etc.

[0247] For example, the communication unit (110) can receive map data, traffic information data, etc. from an external server. The autonomous driving unit (140d) can generate an autonomous driving route and driving plan based on the acquired data. The control unit (120) can control the drive unit (140a) so that the vehicle or autonomous vehicle (100) moves along the autonomous driving route according to the driving plan (e.g., speed / direction control). During autonomous driving, the communication unit (110) can irregularly / periodically acquire the latest traffic information data from an external server and can acquire surrounding traffic information data from surrounding vehicles. In addition, during autonomous driving, the sensor unit (140c) can acquire vehicle status and surrounding environment information. The autonomous driving unit (140d) can update the autonomous driving route and driving plan based on newly acquired data / information. The communication unit (110) can transmit information regarding the vehicle location, autonomous driving route, driving plan, etc. to the external server. External servers can predict traffic information data in advance using AI technology or other technologies based on information collected from vehicles or autonomous vehicles, and provide the predicted traffic information data to the vehicles or autonomous vehicles.

[0248] The embodiments described above are combinations of components and features of the present invention in a predetermined form. Each component or feature should be considered optional unless explicitly stated otherwise. Each component or feature may be implemented without being combined with other components or features. Furthermore, it is also possible to form an embodiment of the present invention by combining some components and / or features. The order of operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is self-evident that claims that do not have an explicit citation relationship in the patent claims may be combined to form an embodiment or may be incorporated as a new claim through a post-application amendment.

[0249] It will be apparent to those skilled in the art that the present invention can be embodied in other specific forms without departing from the scope of the invention. Therefore, the above detailed description should not be construed as limiting in any respect, but rather as illustrative. The scope of the present invention should be determined by a reasonable interpretation of the appended claims, and all modifications within the scope of equivalents of the present invention are intended to be included within the scope of the present invention.

[0250] The present invention can be used in a terminal, base station, or other equipment of a wireless mobile communication system.

Claims

1. In a method for a terminal to transmit a signal in a wireless communication system, Receiving DCI (downlink control information) for uplink scheduling; and Including transmitting an uplink signal based on at least one codebook in a frequency band allocated through the DCI, The PMI (precoding matrix information) included in at least one codebook above is grouped into multiple PMI groups, A method wherein the DCI comprises: i) a first field for assigning a specific PMI group among the plurality of PMI groups to the frequency band; and ii) a second field for assigning a PMI within the specific PMI group for each subband of the frequency band.

2. In paragraph 1, A method in which a PMI is individually assigned to each sub-band through the second field.

3. In paragraph 1, A method in which all PMIs assigned to sub-bands of the above frequency band are related to the same rank.

4. In paragraph 1, A method wherein the second field provides differential PMI information based on the PMI of a reference sub-band among the sub-bands of the frequency band.

5. In paragraph 4, The above reference sub-band is set or predefined through upper layer signaling.

6. In paragraph 1, A method wherein the size of the first field is determined based on the total number of the plurality of PMI groups.

7. In paragraph 1, A method wherein the size of the second field is determined based on a PMI group that includes the largest number of PMIs among the plurality of PMI groups.

8. In paragraph 1, A method in which the second field assigns a PMI to each sub-band through one of the PMI patterns configured within the specific PMI group.

9. A computer-readable recording medium recording a program for performing the method described in paragraph 1.

10. In a device for wireless communication, memory that stores commands; and A processor that performs operations by executing the above instructions, The operations of the above processor are: Receiving DCI (downlink control information) for uplink scheduling; and Including transmitting an uplink signal based on at least one codebook in a frequency band allocated through the DCI, The PMI (precoding matrix information) included in at least one codebook above is grouped into multiple PMI groups, A device wherein the DCI comprises: i) a first field for assigning a specific PMI group among the plurality of PMI groups to the frequency band, and ii) a second field for assigning a PMI within the specific PMI group for each subband of the frequency band.

11. In paragraph 10, Including a transmitter and receiver, The above device is a terminal operating in a wireless communication system.

12. In paragraph 10, The above device is a processing device configured to control a terminal operating in a wireless communication system.

13. In a method for a base station to receive a signal in a wireless communication system, Transmitting DCI (downlink control information) for uplink scheduling; and Including receiving an uplink signal based on at least one codebook in a frequency band allocated through the DCI, The PMI (precoding matrix information) included in at least one codebook above is grouped into multiple PMI groups, A method wherein the DCI comprises: i) a first field for assigning a specific PMI group among the plurality of PMI groups to the frequency band; and ii) a second field for assigning a PMI within the specific PMI group for each subband of the frequency band.

14. In a base station for wireless communication, memory that stores commands; and A processor that performs operations by executing the above instructions, The operations of the above processor are: Transmitting DCI (downlink control information) for uplink scheduling; and Including receiving an uplink signal based on at least one codebook in a frequency band allocated through the DCI, The PMI (precoding matrix information) included in at least one codebook above is grouped into multiple PMI groups, A base station, wherein the DCI comprises: i) a first field for assigning a specific PMI group among the plurality of PMI groups to the frequency band, and ii) a second field for assigning a PMI within the specific PMI group for each subband of the frequency band.

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