Method performed by terminal or network in wireless communication system and device therefor

Abstract

A terminal according to at least one of embodiments disclosed in the present specification may: receive information regarding a channel state information (CSI) reporting configuration through upper layer signaling; acquire CSI on the basis of as many CSI-reference signal (RS) resources as L among as many CSI-RS resources as K; and transmit a CSI report on the basis of the CSI. As many CSI-RS resources as P among the as many CSI-RS resources as L may be determined through the information regarding the CSI reporting configuration. The remaining as many CSI-RS resources as (L-P) may be selected by the terminal. The CSI report may include as many CSI-RS resource indicators (CRIs) as (L-P) regarding the as many CSI-RS resources as (L-P) selected by the terminal.

Description

Method performed by a terminal or network in a wireless communication system and device therefor

[0001] The present disclosure relates to a wireless communication system, and more particularly, to a method and device for transmitting or receiving an uplink / downlink wireless signal by a terminal or a network 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] In NR Rel.15~18, up to 32-Tx port CSI-RS transmission is supported, and a CRI (CSI-RS resource indicator) is defined to indicate the CSI-RS that the terminal uses for CSI reporting, and the structure is such that 1 CRI is linked to 1 CSI report.

[0004] To increase system throughput in NR Rel-19, discussions are underway to expand to a maximum of 128 port CSI-RS.

[0005] The technical task of this disclosure is to provide a method and device for efficiently performing wireless signal transmission and reception processes. As an example, methods for CSI reporting for multiple CRIs are provided.

[0006] In addition to the technical challenges described above, other technical challenges can be inferred from the description below.

[0007] According to one aspect, a method performed by a terminal includes receiving information about a CSI (channel state information) reporting configuration through upper layer signaling; acquiring CSI based on L CSI-RS resources among K CSI-RS resources; and transmitting a CSI report based on the CSI, wherein P CSI-RS resources among the L CSI-RS resources are determined through the information about the CSI reporting configuration, and the remaining LP CSI-RS resources are selected by the terminal, and the CSI report may include LP CRIs (CSI-RS resource indicators) for the LP CSI-RS resources selected by the terminal.

[0008] The above LP CSI-RS resources can be selected from among the KP CSI-RS resources remaining after excluding the P CSI-RS resources among the K CSI-RS resources.

[0009] Each of the above LP CRIs may include bits indicating which of the KP CSI-RS resources each CRI is associated with.

[0010] The total number of bits included in each CRI can be determined based on KP.

[0011] The above CSI report may be related to a Type-2 CSI codebook. The combination of parameters constituting the Type-2 CSI codebook may be set in common for the L CSI resources.

[0012] The above CSI report can be configured to individually report an RI (rank indicator) for each of the L CSI-RS resources.

[0013] The above CSI report can be configured to individually report a CQI (channel quality indicator) for each of the L CSI-RS resources.

[0014] A codebook subset restriction (CBSR) for the CSI codebook can be set for each CSI-RS resource.

[0015] In the above CSI report, the LP CSIs for the LP CSI-RS resources can be sorted according to the order in which the LP CRIs are arranged.

[0016] According to another aspect of the present disclosure, a non-transitory computer-readable recording medium having recorded thereon a program for performing the method described above may be provided.

[0017] According to another aspect of the present disclosure, a device includes a memory configured to store instructions; and a processor configured to perform operations by executing the instructions, wherein the operations of the processor include receiving information about a channel state information (CSI) reporting configuration through higher layer signaling; acquiring CSI based on L CSI-RS resources among K CSI-RS resources; and transmitting a CSI report based on the CSI, wherein P CSI-RS resources among the L CSI-RS resources are determined through the information about the CSI reporting configuration, and the remaining LP CSI-RS resources are selected by the terminal, and the CSI report may include LP CRIs (CSI-RS resource indicators) for the LP CSI-RS resources selected by the terminal.

[0018] The above device may further include a transceiver.

[0019] The above device may be a terminal in a wireless communication system.

[0020] The above device may be a processing device configured to control a terminal in a wireless communication system.

[0021] According to another aspect of the present disclosure, a method performed by a base station includes transmitting information on a channel state information (CSI) reporting configuration to a terminal through higher layer signaling; and receiving, from the terminal, a CSI report for L CSI-RS resources among K CSI-RS (reference signal) resources configured for the terminal, wherein P CSI-RS resources among the L CSI-RS resources are determined through the information on the CSI reporting configuration, and the remaining LP CSI-RS resources are selected by the terminal, and the CSI report may include LP CRIs (CSI-RS resource indicators) for the LP CSI-RS resources selected by the terminal.

[0022] According to another aspect of the present disclosure, a base station for wireless communication includes a memory configured to store instructions; and a processor configured to perform operations by executing the instructions, wherein the operations of the processor include transmitting information on a channel state information (CSI) reporting configuration to a terminal through higher layer signaling; and receiving a CSI report for L CSI-RS resources among K CSI-RS (reference signal) resources configured for the terminal from the terminal, wherein P CSI-RS resources among the L CSI-RS resources are determined through the information on the CSI reporting configuration, and the remaining LP CSI-RS resources are selected by the terminal, and the CSI report may include LP CRIs (CSI-RS resource indicators) for the LP CSI-RS resources selected by the terminal.

[0023] According to the present disclosure, wireless signal transmission and reception can be efficiently performed in a wireless communication system. For example, by reporting multiple CRIs through CSI reporting, CSI reporting can be performed more efficiently, and up to 128 ports can be accurately utilized based on CSI reporting, thereby improving system throughput.

[0024] In addition to the technical effects described above, other technical effects can be inferred from the description below.

[0025] 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.

[0026] Figure 2 illustrates the structure of a radio frame.

[0027] Figure 3 illustrates a resource grid of slots.

[0028] Figure 4 illustrates an example of physical channels being mapped within a slot.

[0029] Figure 5 illustrates the PDSCH and ACK / NACK transmission process.

[0030] Figure 6 illustrates a PUSCH transmission process.

[0031] Figure 7 shows an example of a CSI-related procedure.

[0032] Figure 8 illustrates the antenna configuration and the port configuration within the panel.

[0033] Figure 9 is a diagram illustrating the structure of an enhanced Type II codebook.

[0034] FIG. 10 is a diagram illustrating a method for performing CSI reporting for multiple CSI-RS resources according to one embodiment.

[0035] FIG. 11 is a diagram illustrating a method for reporting CSI to a network in a terminal according to one embodiment.

[0036] FIG. 12 illustrates a flow of a method performed by a terminal according to one embodiment.

[0037] FIG. 13 illustrates a flow of a method performed by a base station according to one embodiment.

[0038] Figures 14 to 17 illustrate communication systems and wireless devices applicable to the present disclosure.

[0039] 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.

[0040] As more and more communication devices demand greater communication capacity, the need for improved mobile broadband communications compared to existing RAT (Radio Access Technology) is emerging. Furthermore, massive MTC (Machine Type Communications), 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.

[0041] For clarity of explanation, the description will focus on 3GPP NR, but the technical idea of ​​the present invention is not limited thereto.

[0042] 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.

[0043] 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.

[0044] Figure 1 is a drawing for explaining physical channels used in a 3GPP NR system and a general signal transmission method using them.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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

[0052] * N slot symb : Number of symbols in the slot

[0053] * N frame,u slot : Number of slots in the frame

[0054] * N subframe,u slot : Number of slots in a subframe

[0055] 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.

[0056] SCS (15*2^u)N slot symb N frame,u slot N subframe,u slot 60KHz (u=2)12404

[0057] 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.

[0058] 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).

[0059] 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.

[0060] 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.

[0061] Below, each physical channel is described in more detail.

[0062] 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).

[0063] 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.

[0064] 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.

[0065] - controlResourceSetId: Indicates the CORESET associated with the search space.

[0066] - monitoringSlotPeriodicityAndOffset: Indicates the PDCCH monitoring period (in slots) and the PDCCH monitoring interval offset (in slots).

[0067] - monitoringSymbolsWithinSlot: Indicates the PDCCH monitoring symbols within the slot (e.g., the first symbol(s) of the CORESET).

[0068] - nrofCandidates: AL={1, 2, 4, 8, 16} indicates the number of PDCCH candidates (one of 0, 1, 2, 3, 4, 5, 6, 8)

[0069] * 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.

[0070] Table 3 illustrates the characteristics of each search space type.

[0071] 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

[0072] Table 4 illustrates DCI formats transmitted via PDCCH.

[0073] 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

[0074] 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.

[0075] 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.

[0076] 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.

[0077] PUCCH carries Uplink Control Information (UCI). UCI includes:

[0078] - SR (Scheduling Request): Information used to request UL-SCH resources.

[0079] - 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.

[0080] - 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).

[0081] 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).

[0082] 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)

[0083] 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.

[0084] 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).

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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:

[0091] - Frequency domain resource assignment: Indicates the set of RBs allocated to the PDSCH.

[0092] - 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).

[0093] - PDSCH-to-HARQ_feedback timing indicator: Indicates K1

[0094] - HARQ process number (4 bits): Indicates the HARQ process ID (Identity) for data (e.g., PDSCH, TB)

[0095] - PUCCH resource indicator (PRI): Indicates the PUCCH resource to be used for UCI transmission among multiple PUCCH resources within the PUCCH resource set.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] 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.

[0104] - Frequency domain resource assignment: Indicates the set of RBs allocated to PUSCH.

[0105] - 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.

[0106] 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.

[0107] CSI-related actions

[0108] Figure 7 shows an example of a CSI-related procedure.

[0109] 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.

[0110] - 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.

[0111] - 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.

[0112] - 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.

[0113] - 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.

[0114] - 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.

[0115] 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).

[0116] 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.

[0117] 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.

[0118] CSI codebooks defined in the NR standard (e.g., PMI codebooks) can be broadly divided into Type I and Type II codebooks. Type I codebooks are primarily targeted at SU (Single User)-MIMO, which supports both high-order and low-order signals. Type II codebooks can primarily support MI-MIMO, which supports up to two layers. Compared to Type I, Type II codebooks can provide more accurate CSI, but may increase signaling overhead. Meanwhile, Enhanced Type II codebooks were introduced to address the CSI overhead shortcomings of existing Type II codebooks. Enhanced Type II codebooks were introduced by reducing the codebook payload by considering frequency-axis correlation.

[0119] CSI reporting via PUSCH can be configured as Part 1 and Part 2. Part 1 has a fixed payload size and is used to identify the number of information bits in Part 2. Part 1 is transmitted in its entirety before Part 2.

[0120] - For Type I CSI feedback, Part 1 contains the RI (if reported), the CRI (if reported), and the CQI of the first code word. Part 2 contains the PMI, and when RI > 4, Part 2 contains the CQI.

[0121] - For Type II CSI feedback, Part 1 contains the RI (if reported), CQI, and an indication of the number of non-zero WB amplitude coefficients per layer of Type II CSI. Part 2 contains the PMI of Type II CSI.

[0122] - For Enhanced Type II CSI feedback, Part 1 contains the RI (if reported), CQI, and the total number of non-zero WB amplitude coefficients for all layers of Enhanced Type II CSI. Part 2 contains the PMI of Enhanced Type II CSI.

[0123] If CSI reporting on PUSCH includes two parts and the CSI payload to be reported is less than the payload size provided by the PUSCH resources allocated for CSI reporting, the UE may omit part of Part 2 CSI.

[0124] Meanwhile, semi-persistent CSI reporting performed in PUCCH format 3 or 4 supports Type II CSI feedback, but only Part 1 of Type II CSI feedback.

[0125] QCL (quasi-co location)

[0126] 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.

[0127] 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:

[0128] - 'QCL-TypeA': {Doppler shift, Doppler spread, average delay, delay spread}

[0129] - 'QCL-TypeB': {Doppler shift, Doppler spread}

[0130] - 'QCL-TypeC': {Doppler shift, average delay}

[0131] - 'QCL-TypeD': {Spatial Rx parameter}

[0132] Figure 8 illustrates the antenna configuration and the port configuration within the panel.

[0133] Referring to FIG. 8, the antenna configuration (910) can be set for the first domain (1st domain) and the second domain (2nd domain), and TXRU virtualization can be applied in relation to the antenna configuration (910) in relation to the port configuration (920).

[0134] With respect to the antenna configuration (910), M represents the number of columns in the panel (i.e., the number of antenna ports in the first domain within the panel), N represents the number of rows in the panel (i.e., the number of antenna ports in the second domain within the panel), P represents polarization (1: co-pol, 2: X-pol), Mg represents the number of panels in the first domain, and Ng represents the number of panels in the second domain. Accordingly, the total number of antenna elements can be expressed as P*M*N*Mg*Ng. As an example, the antenna configuration (910) illustrated in FIG. 8 corresponds to [(M, N, P, Mg, Ng) = (4, 4, 2, 2, 2)]. In Fig. 8, dgH represents panel spacing in the first domain, dgV represents channel spacing in the second domain, dH represents antenna spacing in the first domain, and dV represents antenna spacing in the second domain.

[0135] With respect to the panel configuration (920), N1 represents the number of columns in the first domain (the number of antenna ports in the first domain within the panel), N2 represents the number of rows in the second domain (the number of antenna ports in the second domain within the panel), and P represents polarization (1: co-pol, 2: X-pol). Accordingly, the total number of CSI-RS ports in the panel can be expressed as P*N1*N2. For example, the panel configuration (920) illustrated in FIG. 8 corresponds to [(N1, N2, P) = (2, 2, 2)].

[0136] CSI Codebook

[0137] CSI codebooks defined in the NR standard (e.g., PMI codebooks) can be broadly categorized into Type I and Type II codebooks. For a deeper understanding of these codebooks, refer to Section 5.2.2.2 of TS 38.214 (incorporated by reference).

[0138] (1) Type I codebook

[0139] Type I codebooks primarily target Single User (SU)-MIMO, which supports both high-order and low-order signals. Type I codebooks can be divided into (i) single-panel codebooks and (ii) multi-panel codebooks. (i) A single-panel codebook may be based on the assumption that a terminal receives downlink transmissions from a single antenna panel. (ii) A multi-panel codebook may support base station configurations that use multiple (e.g., two or four) antenna panels. Unlike a single-panel codebook, which supports ranks 1 through 8, a multi-panel codebook can support ranks 1 through 4.

[0140] A Type I codebook can be configured with the selection of preferred DFT vector(s) from an oversampled DFT vector set as a spatial domain basis and the co-phase instructions for the cross polarization of the base station antenna.

[0141] As an example, the codeword vector for 1-layer transmission for a 1D array antenna can be defined based on mathematical expression 1.

[0142]

[0143] In mathematical expression 1, N represents the number of antenna elements included in the 1D antenna array, O represents an oversampling factor, and the index of the codebook vector l can be 0, 1, 2..., O*N-1.

[0144] Meanwhile, the precoder vector for a 2D antenna array can be defined based on the Kronecker product between two 1D array precoder vectors.

[0145] (2) Type II codebook

[0146] Type II codebooks can primarily support MI-MIMO, which supports up to two layers. Compared to Type I, Type II codebooks can provide more accurate CSI, but may increase signaling overhead. In a Type II codebook, the PMI can identify a set of beams and a set of amplitude coefficients. The amplitude coefficients can be used to generate a weighted sum of the beams. Type II codebooks can also identify the phase shift due to co-phasing between beams. Type II port selection codebooks can support wideband / long-term CSI (e.g., i1) and subband / short-term CSI (e.g., i2) reporting based on precoded (or beamformed) CSI-RSs when the base station knows information about the channel between the terminal and the base station.

[0147] For Type II codebooks, multiple DFT vectors are selected as SD basis, and the selected DFT vectors are linearly combined to achieve high resolution and excellent MU-MIMO performance.

[0148] Meanwhile, the enhanced Type II codebook was introduced to address the CSI overhead shortcomings of the existing Type II codebook by reducing the payload of the codebook by considering the correlation of the frequency axis.

[0149] Figure 9 is a diagram illustrating the structure of an enhanced Type II codebook.

[0150] Referring to Fig. 9, the precoding matrix W in the enhanced Type II codebook can be expressed as W = W1*W2*W3. W1 corresponds to the SD basis related to SD compression, W3 corresponds to the FD basis related to FD compression, and W2 corresponds to linear combining (LC) coefficients according to the FD compression of W3. When the terminal determines the matrix W as the PMI of the enhanced Type II, it reports the indices of W1, the coefficients of W2, and the indices of W3 to the network. The dimension of the matrix W is P(=2N1*N2)*N3, where W1 is P*2L, W2 is 2L*M, and W3 is N3*M. The terminal selects 2L basis beam vectors with respect to W1, M LC coefficients with respect to W2, and M FD basis vectors with respect to W3 (wherein each vector is an orthogonal DFT vector with a size of N3*1). L is the number of SD beams as a parameter for SD compression, which can be 2, 3, or 6. N3 and M are parameters for FD compression, where N3 is the DFT size for FD compression, and N3=N SB *It is expressed as R, where R is the granularity between CQI and PMI, which can be 1 or 2. M is the number of FD compression units, and is expressed as M = ceiling (p*(N3 / R)). The (L, p, β) parameter combination (paramCombination-r16) that defines enhanced Type II is as shown in Table 6.

[0151] paramCombination-r16LP v βυ ∈{1,2}υ ∈{3,4}121 / 41 / 81 / 4221 / 41 / 81 / 2341 / 41 / 81 / 4441 / 41 / 81 / 2541 / 41 / 43 / 4641 / 21 / 41 / 2

[0152] In Table 6, v corresponds to RI, and β is a parameter related to the upper limit of the LC coefficients selected by the terminal.

[0153] The enhanced Type II codebook vector constituting the l-th layer is expressed as in mathematical expression 2.

[0154]

[0155]

[0156] In Equation 2, l = 1, 2, 3, 4, and N1 and N2 represent the lengths of the first and second spatial domains (SD) of each base station (or each port group). v m1 (i) , m2 (j) (i=0,1,...,L-1) are L SD DFT vectors selected for linear combining (e.g., they can be 1-dimensional DFT vectors or 2-dimensional DFT vectors depending on the antenna geometry of each base station). The codebook vectors are determined by the parameters q1, q2, n1, and n2, which correspond to parameters introduced to select the optimal L beams among a total of Q1*N1*Q2*N2 beams (where Q1 and Q2 are oversampling factors for the first and second domains). n3 is a parameter introduced to select a frequency domain (FD) DFT basis. p l (1) , p l (2) corresponds to the amplitude coefficient. p l (1) is an indicator of a 4-bit quantization level, and is an indicator that indicates the relative amplitude through 4 bits based on the largest value among the strongest coefficients (p_ref) for each polarization for each layer (polarization with the strongest coefficient). p l(2) corresponds to an indicator indicating the relative amplitude of 3 bits based on p_ref within each polarity. The 4-bit phase coefficient indicator is i ,2,5,l and this is φ l,i,f is associated with . t represents the frequency domain index (t=0,...,N3-1, e.g., a group of PRBs or subbands), and y is a DFT vector of length-N3, which is the FD basis. t,l (f) Each element can correspond to Mv. Mv corresponds to the number of FD bases selected by the terminal among N3 FD bases.

[0157] CSI reporting based on multiple CSI-RS / CRI

[0158] In the following description, a channel measurement resource (CMR) may include a CSI-RS resource configured for channel measurement (e.g., non-zero power CSI-RS). An interference measurement resource (IMR) may include a CSI-RS resource configured for interference measurement (e.g., zero / non-zero power CSI-RS).

[0159] In Rel-19 NR MIMO or later standards, CSI supporting up to 128 CSI-RS ports in FR1 can be considered to increase system throughput of DL / UL and for more flexible MIMO operation.

[0160] a. Type-I codebook refinement supporting up to a total of 128 CSI-RS ports across all resources, assuming legacy CSI-RS resources (with up to 32 CSI-RS ports per resource), based on extension of legacy codebooks.

[0161] b. Type-II codebook refinement supporting up to a total of 128 CSI-RS ports across all resources, assuming legacy CSI-RS resources (with up to 32 CSI-RS ports per resource), based on extension of legacy codebooks, without modifying any codebook parameter other than introducing additional values ​​for the number of ports codebook parameter(s).

[0162] c. Extension of CRI(s)-based CSI reporting (CQI / PMI / RI calculated per CRI for ≥ 1 CRI) for hybrid beamforming supporting up to a total of 128 CSI-RS ports across all resources, with up to 32 CSI-RS ports per resource, without new codebook design.

[0163] In relation to the above, TS 38.214 has the following restrictions on the number of CSI-RS resources and CSI-RS ports, as shown in Table 7.

[0164] When a UE is configured with a CSI-ReportConfig with the upper layer parameter reportQuantity set to 'cri-RSRP', 'cri-RI-PMI-CQI', 'cri-RI-i1', 'cri-RI-i1-CQI', 'cri-RI-CQI', 'cri-RI-LI-PMI-CQI', 'cri-SINR' or 'cri-SINR-Index' and Ks>1 resources are configured in the corresponding resource set for channel measurement, the UE shall derive CSI parameters other than the reported CRI, where CRI k (k ≥ 0) is the corresponding resource set for channel measurement. The (k+1)th entry of the associated nzp-CSI-RS-Resources of the NZP-CSI-RS-ResourceSet, andCorresponds to the (k+1)th entry of the associated csi-IM-Resource of the corresponding csi-IM-ResourceSet for interference measurements (if configured) or the (k+1)th entry of the associated nzp-CSI-RS-Resources of the corresponding NZP-CSI-RS-ResourceSet (if reportQuantity is set to 'cri-SINR' or 'cri-SINR- Index ' for CSI-ReportConfig). If Ks=2 CSI-RS resources are configured, each resource shall contain at most 16 CSI-RS ports. 2 <Ks≤8 CSI-RS 자원이 설정된 경우 각 자원은 최대 8개의 CSI-RS 포트를 포함해야 한다.(Except for a CSI-ReportConfig configured with reportQuantity set to 'cri-RI-PMI-CQI' and codebookType set to 'typeII-CJT-r18', 'typeII-CJT-PortSelection-r18', 'typeII-Doppler-r18', or 'typeII-Doppler-PortSelection-r18', if the UE is configured with a CSI-ReportConfig with the higher layer parameter reportQuantity set to 'cri-RSRP', 'cri-RI-PMI-CQI ', 'cri-RI-i1', 'cri-RI-i1-CQI', 'cri-RI-CQI', 'cri-RI-LI-PMI-CQI', 'cri-SINR', or 'cri-SINR- Index ', and Ks> 1 resources are configured in the corresponding resource set for channel measurement, then the UE shall derive the CSI parameters other than CRI conditioned on the reported CRI,where CRI k(k≥0) corresponds to the configured (k+1)-th entry of associated nzp-CSI-RS-Resources in the corresponding NZP-CSI-RS-ResourceSet for channel measurement, and (k+1)-th entry of associated csi-IM-Resource in the corresponding csi-IM-ResourceSet (if configured) or (k+1)-th entry of associated nzp-CSI-RS-Resources in the corresponding NZP-CSI-RS-ResourceSet (if configured for CSI-ReportConfig with reportQuantity set to 'cri-SINR' or 'cri-SINR- Index ') for interference measurement. If Ks=2 CSI-RS resources are configured, each resource shall contain at most 16 CSI-RS ports. If 2 <Ks≤8 CSI-RS resources are configured, each resource shall contain at most 8 CSI-RS ports.),

[0165] The constraints in Table 7 are intended to prevent the computational complexity of the terminal from becoming too large. According to one embodiment of the present disclosure, the constraints can be relaxed as follows.

[0166] For terminals that support Release 19 multiple CRI reporting, the following CSI-RS port and CSI-RS resource limitations may apply.

[0167] - When 4 or fewer CSI-RS resources are set, each resource contains up to 32 CSI-RS ports.

[0168] - When more than 4 and less than 8 CSI-RS resources are set, each resource contains up to 16 CSI-RS ports.

[0169] With regard to multiple CSI reporting, the following CSI reporting and CMR / IMR setting methods are supported in the existing NR standard.

[0170] 1) STRP: Single CRI reporting (CRI / CQI / RI / PMI / LI)

[0171] 2) NCJT (Rel-17):

[0172] i) CMR / IMR settings

[0173] a. M1, M2 CMR for 1st and 2nd groups (for STRP)

[0174] b. N CMR pair for NCJT

[0175] c. M1+M2+N CSI-IMs (ZP CSI-RS only)

[0176] ii) Reporting options

[0177] a. Option 1:

[0178] X STRP CSI (CRI / PMI / RI / LI / CQI)

[0179] 1 NCJT CSI (CRI - preferred CMR pair, CQI + (RI1, PMI1), (RI2, PMI2))

[0180] b. Option 2:

[0181] CRI for either CMR pair or CMR for STRP

[0182] If CMR is NCJT: 1 NCJT CSI (CQI + (RI1, PMI1), (RI2, PMI2))

[0183] If CMR is NCJT: CQI / RI / PMI / LI

[0184] 3) CJT (Rel-18): Up to 4 TRPs through the same number of ports from one CSI-RS resource set (up to 128 ports / 32 ports per resource)

[0185] i) Only one NZP CSI-RS resource can be set for interference measurement, and only one CSI-IM resource can be set regardless of the NTRP value.

[0186] ii) Selection of N among N_TRP(CMR) is included in CSI Part 1

[0187] In this disclosure, to increase the probability of MU pairing, we consider performing CSI reporting associated with multiple CRIs. However, if individual reporting is performed for each CRI, the payload increases by the number of CSI-RSs, resulting in the same payload as if each CSI report were triggered individually, potentially resulting in little benefit in terms of payload or resource allocation. Therefore, we propose an effective CRI-based CSI reporting scheme to address these issues.

[0188] Proposal 1

[0189] The terminal can select L CSI-RS resources from among K CSI-RS resources and perform CSI reporting for the selected L CSI-RS resources. L and K are integers greater than or equal to 1, and L≤K. At this time, for CSI reporting, the CRI (CSI-RS resource indicator) can be determined / reported based on at least one of the following methods.

[0190] (1) Method 1: K CSI-RS resources are set within a CSI-RS resource set, and reporting for L CSI-RS resources is instructed / set or agreed upon in advance through higher layer signaling (e.g., RRC, MAC-CE, DCI), and the (best / preferred) CRI is reported to the base station as a combination of K choose L, and its bit width can be determined as in mathematical expression 3.

[0191]

[0192] In mathematical expression 3, () means combination operation ( K C L ).

[0193] (2) Method 2: K CSI-RS resources are configured within a CSI-RS resource set, and the (max) number of CSI-RS resources L to be reported by the UE is indicated / configured by higher layer signaling (e.g., RRC, MAC-CE, DCI) or agreed upon in advance. Based on the L values, the K resources are grouped into K1, K2, ..., KL (K1+K2+... + KL = K), and (best / preferred) CRI reporting is performed for each of the L groups. In this case, the (total) bit width of the CRI can be determined as in Equation 4.

[0194]

[0195] (3) Method 3: K CSI-RS resources are set within the CSI-RS resource set, and using the K bit-map, L resources are selected to report (best / preferred) CRI by instructing / setting or pre-arranging to report L CSI-RS resources through higher layer signaling (e.g., RRC, MAC-CE, DCI).

[0196] (4) Method 4: K CSI-RS resources are configured within a CSI-RS resource set, and reporting on L CSI-RS resources is instructed / configured or agreed upon in advance through higher layer signaling (e.g., RRC, MAC-CE, DCI). In this case, M combinations of selecting L resources from among K resources are predefined or configured as higher layers, and the terminal reports one of the M combinations as the (best / preferred) CRI. In this case, the bit width of the CRI becomes Ceiling (log2M).

[0197] (5) Method 5: K CSI-RS resources are configured within a CSI-RS resource set, and reporting on the K CSI-RS resources is instructed / configured through higher layer signaling (e.g., RRC, MAC-CE, DCI), or can be agreed upon in advance. In this case, reporting on CRI is not necessary, and therefore, the terminal does not have the CRI field (absent), and the base station ignores the field in the CSI report.

[0198] (6) Method 6: A method in which a base station pre-selects P (e.g., P=1 or 2) CSI-RS resources among L CSI-RS resources to be reported by a UE and instructs the UE. In this case, the UE must select the remaining CSI-RSs based on the LP resources excluding the P resources. In other words, the UE selects the LP CSI-RS resources among the remaining KP CSI-RS resources excluding the P resources from the total K resources. Each of the LP CRIs corresponding to the LP CSI-RS resources can indicate which of the KP CSI-RS resources the corresponding CSI-RS is. In other words, the first CRI among the LP CRIs can include bits indicating one of the KP CSI-RS resources, and the second CRI can include bits indicating the other one of the KP CSI-RS resources.

[0199] For example, each CRI may contain Ceiling (log2(KP)) bits to indicate one of the KP CSI-RS resources.

[0200] As another example, each CRI may point to any one of the KP CSI-RS resources via the KP bitmap.

[0201] As another example, the (total) bit width of CRI can be determined as in Equation 5 to indicate which combination of LP CSI-RS resources is selected among various combinations of selecting LP resources from among the total KP resources.

[0202]

[0203] Meanwhile, at least one of the K, L, and P values ​​may be provided to the terminal through network signaling (e.g., RRC signaling).

[0204] For example, CRIs may be omitted for P CSI-RS resources indicated by the base station. For example, P CRIs may not be transmitted, and LP CRIs may be included in the CSI report.

[0205] Meanwhile, for the convenience of explanation, let us consider the following resource configuration example. As an example of multiple CRI reporting, let us set up 128 CSI-RSs, and assume that multiple CSI-RS resources are set up as follows within the CSI-RS resource set.

[0206] - CSI-RS resource #1 → 32 port CSI-RS,

[0207] - CSI-RS resource #2 → 32 port CSI-RS,

[0208] - CSI-RS resource #3 → 32 port CSI-RS,

[0209] - CSI-RS resource #4 → 32 port CSI-RS,

[0210] - CSI-RS resource #5 → 32 port CSI-RS,

[0211] - CSI-RS resource #6 → 32 port CSI-RS,

[0212] - CSI-RS resource #7 → 32 port CSI-RS,

[0213] - CSI-RS resource #8 → 32 port CSI-RS,

[0214] Then, among the above 8 CSI-RS resources (K=8), 4 (L=4) are selected to perform CSI reporting based on (total) 128 port CSI-RS. The criterion for selecting L resources out of K by the terminal is that L CSI-RS resources can be selected based on RSRP / SINR / CQI measured by the terminal.

[0215] (1) In the case of method 1, in the example above, 8C4 (8*7*6*5 / 4! = 56) has a total of 6 bits of CRI bit field, and CRI for 4 resources is indicated in common.

[0216] (2) In the case of method 2, assuming that K1=K2=K3=K4 are each set to a value of 2, and CSI-RS resources #1 and #2 correspond to K1, CSI-RS resources #3 and #4 correspond to K2, CSI-RS resources #5 and #6 correspond to K3, and CSI-RS resources #7 and #8 correspond to K4, then based on ceiling log22 = 1, for L=4 CSI-RSs reported based on 1 bit each, a total of 4 bits, either 4 bits are indicated as common to the resource, or 1 bit CRI is indicated for each resource reported using a 1-bit CRI field. For the convenience of setting and reporting in method 2, K1=K2,...,=K L = We can promise to limit to K / L. Another way to determine the bit width of Method 2 is to consider the following.

[0217] - The bit width for joint indication for L groups is Ceiling (log2K1K2..K) L ) may be.

[0218] - To prevent field size variation for each group when reporting each L CRI, the bit width can be as shown in mathematical expression 6.

[0219]

[0220] (3) In the case of method 3, 4 resources can be indicated using an 8 bit-map. For example, in the case of "10101010", it can mean indicating CSI-RS resources #1, #3, #5, and #7, respectively.

[0221] (4) Method 4 is a method in which the index of a CSI-RS resource group / combination is reported through the CRI instead of the CRI explicitly indicating CSI-RS resources. For example, if M=2, the 1st group is indicated / set as "CSI-RS resource #1, #3, #5, #7" and the 2nd group is indicated / set as "CSI-RS resource #2, #4, #6, #8", this means that whether it is the 1st group or the 2nd group is reported through the CRI with 1 bit. In the case of the above group, although mutually exclusive was expressed in the above example, in some cases, it is sufficient for the base station configuration to allow for overlapping resources between groups.

[0222] (5) In the case of method 5, in the above proposal

[0223] - CSI-RS resource #1 → 32 port CSI-RS,

[0224] - CSI-RS resource #2 → 32 port CSI-RS,

[0225] - CSI-RS resource #3 → 32 port CSI-RS,

[0226] - CSI-RS resource #4 → 32 port CSI-RS,

[0227] This means that the terminal reports CSI for all resources within the resource set, as set as above (K=4) and L=4 within the CSI-RS resource set. In this case, CRI is omitted.

[0228] (6) In the case of the above method 6, since CSI for P CSI-RS resources commonly applied to multiple UEs must be reported, the base station can use the corresponding CSI-RS resources for MU-MIMO at the desired time.

[0229] FIG. 10 is a diagram illustrating a method for performing CSI reporting for multiple CSI-RS resources according to method 6. In FIG. 10, the K, P, and L values ​​can be provided to a terminal through upper layer signaling of information about CSI reporting configuration.

[0230] Based on the P CSI-RS resources among the K CSI-RS resources indicated by the network, LP CSI-RS resources can be selected from the KP resources. In the example of Fig. 10, for convenience, it is assumed that P = 1 and LP = 2.

[0231] A terminal may transmit CSI reports for a total of L CSI-RS resources to the network. At this time, CRI reports may be omitted for P CSI-RS resources (e.g., CSI-RS resource #1) indicated by the network, and only Part 1 / 2-CSI may be reported. CRIs (e.g., CRI#1, CRI#2) may be reported for LP CSI-RS resources selected by the terminal itself. CRI#1 may include information (e.g., bits) indicating CSI-RS resource #3 among KP CSI-RS resources, and CRI#2 may include information (e.g., bits) indicating CSI-RS resource #5 among KP CSI-RS resources.

[0232] Meanwhile, the number of CSIs actually reported by the terminal by measuring / calculating the CSI-RS may differ from the L value set / indicated by the base station. For example, in the above example, the L value is indicated as 4, but the number of CSIs actually reported by the terminal may be determined to be 2 as a result of measurement / calculation by the terminal (e.g., through SINR measurement per resource). In this case, a problem may arise where the CSI payload determined by the base station and the CSI payload actually reported by the terminal differ. To address this issue, the above methods may be considered.

[0233] Proposal 1-1

[0234] When a terminal selects M CSI-RS resources, which are less than L CSI-RS resources that the base station configures / instructs to report to the terminal among multiple K CSI-RS resources, and performs CSI reporting for multiple M resources, the CRI (CSI-RS resource indicator) is calculated / reported in the following manner. Here, M ≤ L ≤ K.

[0235] - Method A: The bit width for CRI is set as in mathematical expression 7, and the value of M is determined according to the corresponding codepoint.

[0236]

[0237] - Method B: Report M CSI-RS resources as K-bitmaps as in Method 3.

[0238] - Method C: Report information about the M value for CSI part 0, and for CRI, report using the method of Proposal 1 (replacing the L value with M). Here, CSI part 0 refers to CSIs including CSI contents that determine the payload of CSI part 1.

[0239] In the above proposal 1-1, the criterion for selecting M resources of the terminal may be based on RSRP / SINR / CQI / RI / Throughput and / or threshold measured by the terminal to select M CSI-RS resources. As an example of the threshold, the terminal may instruct / configure a higher layer (e.g., RRC, MAC-CE, DCI) to select M CSI-RS resources within -Y dB of the minimum requirement value for RSRP / SINR (e.g., X dB) or the RSRP / SINR / CQI value of the best CSI-RS resource (e.g., resource corresponding to SCRI).

[0240] For example, when specifying / setting a minimum requirement, RSRP / SINR for each resource can be measured / calculated, and M resources that achieve the requirement can be selected. If the selected value of M is greater than L, the terminal selects L resources (e.g., best L) and performs CRI reporting.

[0241] For example, if the Y value is indicated / set to 3 dB in the Best CSI-RS resource-based operation, M resources having SINR / RSRP / CQI performance within a 3 dB difference compared to the SINR / RSRP of the Best CSI-RS are selected and CRI is reported. If the selected value of M is greater than L, the terminal selects L resources (e.g., best L) and performs CRI reporting.

[0242] For method A of the above proposal 1-1, K C1+ K C2+..+ K C L In the method of jointly indicating, M is located between 1 and L, and based on the codepoint, the base station can know information about the M value. In the case of method C, it means 3 part encoding, so in the case of CSI part 0, information about M is reported, and CSI part 1 and CSI part 2 are reported by the terminal as in the existing legacy. In the case of CSI part 1, it includes CRI, RI, CQI for 1st CW, # of non-zero coefficient (only for Type 2), and in the case of CSI part 2, it includes CQI for 2nd CW, PMI, LI, etc. In other words, CSI part 0 is composed of CSI contents with fixed payload, and determines the payload of CSI part 1, and in the case of CSI part 2, the payload is determined based on the contents of CSI part 1.

[0243] If method 6 of the above proposal 1 is applied, the values ​​of K or L can be applied as KP and LP, and the above methods A / B / C can be applied and set.

[0244] Proposal 2

[0245] In order to report CSI for multiple resources by selecting multiple CSI-RS resources from among multiple CSI-RS resources, RI (Rank indicator) can be calculated / reported based on at least one of the following methods.

[0246] (0) Method 0: RI is reported / calculated individually / independently for each of multiple CSI-RS resources.

[0247] (1) Method 1: Multiple CSI-RS resources are commonly reported as one RI value.

[0248] (2) Method 2: For the representative / reference resource, report RI as in the existing legacy CSI report, and for the remaining resources, report differential values ​​based on the representative / reference resource.

[0249] (3) Method 3: RI reports corresponding to the best N (e.g., N=1) resources (e.g., representative resource) among multiple CSI-RS resources can be freely reported, but for the resources reporting the remaining CSI, they can be limited to a specific RI value (e.g., RI=r, where r is configurable by gNB) or reported in a resource common manner.

[0250] Method 0 in the above proposal 2 has the advantage of reporting RI for each CSI-RS resource, which allows for more accurate RI reporting for each CSI-RS. For example, L RIs can be individually calculated / reported for each of L (>1) CSI-RS resources. However, this may have the disadvantage of increasing CSI overhead and the complexity of CSI-RS calculations at the terminal.

[0251] In method 1, as a way to solve the problems described above in method 0, the same RI value is limited for all resources, and the RI report is reported only for the representative resource, or, as in method 3 of proposal 1-1, the common RI value can be included and reported in CSI part 0. In method 2, as a way to reduce the payload of method 0, the remaining resources are reported based on a differential value (e.g., 1-bit / 2-bit differential indicator) based on the RI value in the CSI report for a specific reference resource. The differential RI can include examples of Table 8 (1-bit) and Table 9 (2-bit) below.

[0252] IndexDifferential RI001-1

[0253] IndexDifferential RI01102-13-2

[0254] In the case of Table 8 above, it is suitable for option 2 described below, in which the value corresponding to the representative / reference resource always has the largest RI value, and the rest have 0 or a minus value.

[0255] In the case of the above method 3, if the number of CSI resources that the terminal must report is L, full RI is reported for N, and the remaining NL is reported with a predefined rank value, or (NL) resource is reported with a single value in common. In the case of the predefined / configured rank, RI reporting of the NL resources may be omitted.

[0256] Representative / reference resources in the above methods 1, 2, and 3 can be determined based on the following options. The reference resource does not mean a resource that serves as a reference for CQI measurement in TS 38.214, but rather a representative or reference resource among multiple CSI-RS resources.

[0257] (i) Option 1: The CSI-RS resource corresponding to the first / last / medium in the order in which the CSI-RS resource is set in the CSI-RS resource config (or the order in which it is set in the group, as in method 4 / 5 of proposal 1) is determined as the representative resource.

[0258] (ii) Option 2: A separate strongest CSI-RS resource indicator is provided, and the resource corresponding to this indicator is determined as the representative resource.

[0259] (iii) Option 3: Determine the representative resource based on the lowest / highest index order of the CSI-RS resource ID.

[0260] (iv) Option 4: In the order of receiving CSI-RS resources, the resource corresponding to first / last / medium is determined as the representative resource.

[0261] In the case of the above options, it is possible to apply them to all K resources that the base station sets for the terminal, but the above options can also be applied to a method of selecting a reference / representative resource from among the CSI-RS resources corresponding to L CSI reports that the base station sets / or the terminal selects and reports from among the total K resources.

[0262] In the case of the strongest CSI-RS resource in the above option 2, the representative resource is determined as the resource with the highest CSI-RS reception SINR or RSRP, or the resource with the highest RI (if there are multiple resources, based on options 1, 3, and 4) is determined as the representative resource. In the case of the strongest CSI-RS resource indicator (SCRI), it may be included in CSI part 0 or may be included in CSI part 1 and reported to the base station. In addition, since the CSI corresponding to the CSI-RS indicated by the strongest CSI-RS resource indicator has a high probability of being the best CSI value of the terminal, the reporting of the best CSI can be set to report a more accurate CSI value than the reporting corresponding to other CSI-RS resources. For example, in the case of RI / CQI, in the case of SCRI, the RI / CQI value of full information rather than a differential value can be reported, or the granularity can be increased and reported. In the case of PMI, CSI reports corresponding to SCRI, especially if they are type 2 codebook-based reports, report the granularity of phase and amplitude as 4 bit / 4 bit, but the remaining CSI reports can be reported with a lower granularity (e.g., 3 bit / 3 bit granularity of phase and amplitude) to reduce the payload.

[0263] Proposal 3

[0264] In order to report CSI for multiple resources by selecting multiple CSI-RS resources from among multiple CSI-RS resources, a CQI (Channel quality indicator) can be calculated / reported based on at least one of the following methods.

[0265] (0) Method 0: CQIs can be reported / calculated individually / independently for each of multiple CSI-RS resources. For example, L CQIs can be individually calculated / reported for each of L(>1) CSI-RS resources.

[0266] (1) Method 1: A single CQI value is commonly reported for multiple CSI-RS resources.

[0267] (2) Method 2: For the representative / reference resource, report CQI as in the existing legacy CSI report, and for the remaining resources, report differential values ​​based on the representative / reference resource.

[0268] (3) Method 3: CQI reports corresponding to the best N (e.g., N=1) resources (e.g., representative resource) among multiple CSI-RS resources are freely reported, but for the resources reporting the remaining CSI, a specific CQI value (e.g., RI=r, where r is configurable by gNB) may be limited or reported in a resource common manner.

[0269] For the above proposal 3, it can be applied similarly to proposal 2. However, setting / indicating the same CQI value to all resources as in method 1 may slightly violate the purpose of increasing MU pairing. However, from the perspective of NW energy saving, it can be set for the purpose of providing a common CQI, setting different numbers of ports per resource, and receiving a CSI report on whether the target CQI can be achieved. In this case, the target CQI can be preset by the base station in a higher layer, and the terminal can report to the base station only whether the target CQI has been achieved using the CQI field, the CRI field (if reported, it means that it has been achieved), or a new field. Alternatively, the terminal can report to the base station how much the target CQI differs from the target CQI using a differential CQI value. The differential CQI value can use the legacy differential CQI table or include Tables 8 / 9 of proposal 2 or Table 10 (2 bits) below as an example. Additionally, the reference resource can also utilize / apply the options of Proposal 2 as is.

[0270] IndexDifferential CQI001-12-23-3

[0271] In the case of the above method 3, if the number of CSI resources that the terminal must report is L, full CQI is reported for N, and CSI is calculated as a predefined CQI (Target CQI) value for the remaining NL, or (NL) resources are commonly reported as a single value. In the case of the predefined / configured CQI, CQI reporting of the NL resources may be omitted.

[0272] Proposal 4

[0273] To select multiple CSI-RS resources from among multiple CSI-RS resources and report CSI for the multiple resources, PMI (Precoding matrix indicator) is calculated using the following method.

[0274] (0) Method 0: Report PMI for each of multiple CSI-RS resources.

[0275] (1) Method 1: Distinguish between common PMI and resource-specific PMI. Common PMI is a PMI that commonly corresponds to multiple CSI-RS resources, and resource-specific PMI refers to a PMI specific to each resource. In the case of the above common PMI, it is included and reported only in the CSI report corresponding to the representative resource determined by the representative resource setting method of Proposal 2 / 3, and in the case of resource-specific PMI, it is reported for each resource wise.

[0276] (2) Method 2: CSI reporting for the representative resource determined by the representative resource setting method of Proposal 2 / 3 or the best N (e.g., N=1 set by the base station to the UE) CSI resources is SB CSI reporting, and CSI reporting for the remaining CSI resources is limited to WB CSI reporting.

[0277] For the above proposal 4, multiple CSI-RS resources may be restricted to the same number of CSI-RS ports and / or codebook types. For example, in the above example, the codebook type may be set to 32-port, Type 1, or Type 2 codebook. In addition, it is expected that the codebook parameters are also set to the same indication. For example, the parameter combination of the Rel-16 Type 2 codebook (e.g., enhanced Type 2) described in Table 6 above may be set to resource common. In this case, the number of CSI-RS resources for which the UE reports CSI may be L=2, but is not limited thereto.

[0278] For example, if you want to receive more accurate CSI reports for the (SCRI) resource corresponding to the best CSI-RS resource as described in Proposal 3, the parameter combination for this can be set to a large value. For example, different codebook parameters can be set for each resource (each resource group). For example, resources corresponding to SCRI can indicate / set index 6 of the above paramCombination-r16, and the remaining resources can set index 2. As another example, CSI reports corresponding to SCRI can perform full PMI reporting, but the remaining CSI reports can only report some PMI (e.g., WB PMI (e.g., i11, i12)) or not perform PMI reporting.

[0279] In addition, in the case of the codebook subset restriction set by the base station for interference management purposes, the above-described SD basis restriction and / or per SD group basis amplitude restriction are supported. It can be promised that this CBSR (codebook subset restriction) will be commonly applied to multiple CSI-RS resources. Alternatively, since the degree of interference to the adjacent cell may differ for each CSI-RS resource, it can be set as resource-wise CBSR (codebook subset restriction) (per CMR). For example, a CSI-RS resource-specific CBSR (codebook subset restriction) can be individually set for each of the K CSI-RS resources. Alternatively, multiple CSI-RS resources can be grouped into multiple groups, and CBSR (per CMR group) can be set / applied to each group. An example of the grouping includes an example of method 3 / 4 of proposal 1.

[0280] In the above method 1, WB PMI can be assumed as a representative property of PMI belonging to common PMI. For example, spatial domain basis (i.e., 1D / 2D DFT vector for SD) is representative, which is defined in TS 38.214 (section 5.2.2.2) i 1,1, i 1,2 This is the PMI reported as an index. For the remaining resource-specific PMI, it is the remaining PMI excluding the WB PMI.

[0281] As another example, the values ​​transmitted as CSI part 1 of the PMI could be set as resource common, while the remaining PMI portions (values ​​transmitted as CSI part 2) could be reported separately for each CSI-RS. For example, the PMI portion of CSI part 1 could have a non-zero power coefficient across rank that is linearly combined in type 2 CSI. Making this portion common could have the advantage of reducing payload.

[0282] In the case of the above method 2, the CSI reporting for the representative resource determined by the representative resource setting method of proposal 2 / 3 or the best N (e.g., N=1 set by the base station to the UE) CSI resources is SB CSI reporting, and the CSI reporting for the remaining CSI resources is limited to WB CSI reporting, so that the payload of the PMI reporting can be reduced by reflecting the frequency selectivity for reporting for resources with good performance and only reporting WB CSI for the set BW for the remaining resources. In addition to the above method 2, the base station can set / instruct information about the resources to receive SB CSI / WB CSI reporting to a higher layer.

[0283] For the layer indicator (LI), which stands for Strongest layer, it can be reported resource-wise.

[0284] Proposal 5

[0285] When performing CSI reporting for multiple resources by selecting multiple CSI-RS resources from multiple CSI-RS resources, if the terminal has multiple Rx antenna groups (or panels) and receives a specific CSI-RS resource with a specific Rx antenna group (or panel), information about the Rx antenna group (or panel) can also be included in the CSI report and reported.

[0286] In the case of the above proposal 5, the terminal can receive and / or perform CSI calculation for multiple CSI-RS resources by dividing them into Rx antenna groups (or panels or Rx beams), and in this case, operation for each Rx antenna group becomes possible, which can increase scheduling flexibility from the base station's perspective. Accordingly, the above information is also reported as part of the CSI report, and in particular, it can be a value reported as part of CSI part 1. For example, if the terminal uses two Rx antenna groups, one value among Rx antenna group 1, Rx Antenna group 2, and both Rx antenna groups can be reported with 2 bits. In addition, information on the maximum CSI-RS resource that the terminal can simultaneously receive for each Rx antenna group (or panel or Rx beam) common or Rx antenna group (or panel or Rx beam) can be reported as UE capability.

[0287] Proposal 6

[0288] In a CSI report corresponding to multiple CSI-RSs reported based on some or all of Proposals 1 / 1-1 / 2 / 3 / 4 / 5, CSI is reported in the following CSI encoding order.

[0289] (1) Method 1: CSI part 0 (if present) → CSI part 1 (for CSI report #1) → CSI part 2 (for CSI report #1) → CSI part 1 (for CSI report #2) → CSI part 2 (for CSI report #2) → … CSI part 1 (for CSI report #L) → CSI part 2 (for CSI report #L)

[0290] (2) Method 2: CSI part 0 (if present) → CSI part 1 (for CSI report #1) → CSI part 1 (for CSI report #2) … → CSI part 1 (for CSI report #L) → CSI part 2 (for CSI report #1) → CSI part 2 (for CSI report #2) → … CSI part 2 (for CSI report #L)

[0291] In the case of the above method 1, it is a method of encoding in the order of report ID, and in the case of method 2, it is a method of first grouping by high-level CSI part and then grouping and reporting in the order of the next level part. In the case of methods 1 and 2 of the above proposal 6, the CSI report ID may be defined separately (e.g., based on different mapping rules between CRI and CSI report), and the report ID may be included and reported in Part 1 CSI. Alternatively, it may be implicitly determined in the order in which multiple CSI-RS resources in the CRI are indicated, in which case the report ID reporting is omitted. For example, the LP CSIs for the LP CSI-RS resources may be arranged in the order in which the LP CRIs are arranged in the CSI report.

[0292] If the strongest CSI-RS resource indicator of Proposal 1 / 1-1 is introduced, report ID #1 is determined as the CSI report corresponding to the strongest CSI-RS resource indicator, and the remaining IDs are reported in order according to a specific rule (e.g., the CSI-RS resource ordering method of Proposal 1 / 2 / 3 / 4 / 5), except for the CSI corresponding to the strongest CSI-RS resource indicator.

[0293] For the above proposals 1 / 1-1 / 2 / 3 / 4 / 5 / 6, a common IMR resource (ZP CSI-RS or NZP-CSI-RS) can be set and applied to multiple CMR resources (K). ZP CSI-RS and NZP CSI-RS can be applied / set as the IMR resource.

[0294] This has the advantage of alleviating the complexity of interference measurement of the terminal. However, in the case of MU pair criterion, since it may vary depending on various types of interference (e.g., hypothesis may vary depending on the pair of CMR and IMR), in such cases, the base station may configure multiple IMRs (ZP / NZP CSI-RS). For example, multiple (J) NZP CSI-RSs for IMR may be configured. In this case, since SINR / CQI calculations according to the IMR (ZP / NZP CSI-RS) may differ, one CRI may be used to indicate the CMR + IMR (ZP / NZP CSI-RS) pair and may be reported to the base station.

[0295] For example, consider the following example (K=4, J=2):

[0296] - CMR#1: CSI-RS resource #1 → 32 port CSI-RS,

[0297] - CMR#2: CSI-RS resource #2 → 32 port CSI-RS,

[0298] - CMR#3: CSI-RS resource #3 → 32 port CSI-RS,

[0299] - CMR#4: CSI-RS resource #4 → 32 port CSI-RS,

[0300] - IMR#1: NZP CSI-RS resource #1 → pattern 0 (2-by-2 REs)

[0301] - IMR#2: NZP CSI-RS resource #2 → pattern 1 (4-by-1 REs),

[0302] In the above example, 4 CMRs and 2 IMRs (NZP CSI-RS) are set, and the total number of pairs of CMRs and IMRs can be 8. Therefore, CRI can be used to indicate the 8 CMR and IMR pairs, and the value (K*J) can be set / applied by replacing the K value in Proposals 1 and 1-1. If the CMRs are mapped 1:1 with IMRs (ZP / NZP-CSI-RS), the total hypothesis (K*J) increases, which can increase the size of the CRI field. To this end, it can be agreed that IMRs (ZP / NZP-CSI-RS) are set / applied per CMR group, and the CMR group can be set by the base station in a higher layer or agreed upon in advance. For example, in the above example, CMR#1 and CMR#2 can be divided into CMR group#1, CMR#3 and CMR#4 can be divided into CMR group#2, and different IMRs are mapped to the CMR groups#1 / #2. For example, IMR#1 can be mapped to CMR group#1, and IMR#2 can be mapped to CMR group#2. In this case, there is an advantage of reducing the number of hypotheses to 4 in total, which is half the number of hypotheses in the former case, which is 8. In the above example, only NZP CSI-RS is described as being used for IMR, but it can be extended to an example of using ZP CSI-RS as IMR and / or an example of using NZP CSI-RS and ZP CSI-RS together for IMR. In the case of reporting RI / CQI / PMI, etc. in a common resource in the above proposals 2 / 3 / 4, the above proposals 2 / 3 / 4 can be applied only to CMR resources set to the same IMR.

[0303] In the case of the above proposals 1 / 1-1 / 2 / 3 / 4 / 5 / 6, the invention is to select multiple resources for the terminal to report from multiple CSI-RS resources set by the base station, perform resource-wise CSI reporting corresponding to the number of CSI-RS ports indicated / set for the multiple selected resources, and, in such reporting, to distinguish CSI corresponding to common part / differential part for reporting efficiency and payload reduction, and to report the same.

[0304] Additionally, to increase base station scheduling flexibility, the multiple CSI hypothesis can be further expanded and considered. While the above example considered the hypothesis based on pairs of CMR / IMR resources, CMR resource aggregation can also be considered as another hypothesis. For example, the CMRs to be aggregated can be selected using the CRI indication method in Proposal 1 / 1-1. In this case, 4 CMRs can be selected / reported from the 8 examples described in Proposal 1 to report PMI / CQI / RI for 128 ports. Alternatively, if the best 3 and / or 2 and / or 1 CMRs are used through CRI, some or all of the CSIs (e.g., PMI / CQI / RI) for the aggregated 96 / 64 / 32 ports can be reported together. In this way, the base station can perform port on / off operations for NW energy conservation or allocate the corresponding resources to other UEs based on the reported CSIs. The number of CMRs to be aggregated can be selected and reported to the base station by the terminal (via Proposal 1 / 1-1), but the base station can also configure / instruct in advance through a higher layer. For example, in the hypothesis for the CSI measurement, the base station can configure the terminal with information about the combination to be indicated as CRI in advance.

[0305] Below is an example of this.

[0306] - CMR#1: CSI-RS resource #1 → 32 port CSI-RS,

[0307] - CMR#2: CSI-RS resource #2 → 32 port CSI-RS,

[0308] - CMR#3: CSI-RS resource #3 → 32 port CSI-RS,

[0309] - CMR#4: CSI-RS resource #4 → 32 port CSI-RS

[0310] CRI index12345678CMR Combination1,2,3,41,21,32,41234

[0311] In the above example, if multiple CRIs are selected, it can be understood that the resources are aggregated and reported, and the base station can additionally instruct the terminal whether this is a CSI report for a resource composed of the aggregation or an individual report for multiple CSI-RSs.

[0312] As another example, for network energy conservation purposes, a base station may want to receive CSI for 128-port, 64-port, and 32-port configurations, respectively, and determine how many antenna ports to activate based on this information. Therefore, rather than providing the joint CRI indication, consider indicating an aggregation port for each sub-configuration and receiving CSI for it, as shown below.

[0313] Tables 12 and 13 are modified examples of the above example.

[0314] Table 12 shows Sub-configuration #1 (for 128-port use), where CRI is not required.

[0315] CRI index1CMR Combination1,2,3,4

[0316] Table 13 shows Sub-configuration #2 (for 64-port use), where CRI is 2 bits.

[0317] CRI index123CMR Combination1,21,32,4

[0318] Table 14 shows Sub-configuration #3 (for 32-port use), where CRI is 2 bits.

[0319] CRI index1234CMR Combination1234

[0320] FIG. 11 is a diagram illustrating a method for a terminal to report CSI to a network according to one embodiment. FIG. 11 may relate to at least one of the above-described proposals 1 / 1-1 / 2 / 3 / 4 / 5 / 6.

[0321] Referring to FIG. 11, a terminal may transmit a UE capability report to a base station via upper layer signaling (A05). The UE Capability report may include, but is not limited to, at least one of the maximum number of CSI-RS resources / maximum number of CSI-RS ports that the terminal can support, the total number of CSI-RS ports that can be simultaneously supported, and / or the number of Rx antenna groups.

[0322] The terminal can receive configuration information related to CSI RS transmission and / or CSI reporting from the base station (A10).

[0323] The terminal can receive CSI-RS(s) from the base station (A15) and measure / predict / calculate CSI (A20).

[0324] The terminal can report measured / predicted / calculated CSI to the base station (A25).

[0325] The terminal can receive information for scheduling a downlink channel (e.g., PDCCH, PDSCH) from the base station (A30).

[0326] The terminal can receive a scheduled downlink channel (e.g., PDCCH, PDSCH) (A35).

[0327] FIG. 12 illustrates a flow of a method performed by a terminal according to one embodiment.

[0328] Referring to FIG. 12, the terminal can receive information about CSI (channel state information) reporting settings through upper layer signaling (B05).

[0329] A terminal can acquire CSI based on L CSI-RS resources among K CSI-RS (reference signal) resources (B10). Among the L CSI-RS resources, P CSI-RS resources can be determined based on information about the CSI reporting configuration. The remaining LP CSI-RS resources can be selected by the terminal.

[0330] The terminal may transmit a CSI report based on the CSI (B15). The CSI report may include LP CRIs (CSI-RS resource indicators) for the LP CSI-RS resources selected by the terminal.

[0331] The above LP CSI-RS resources can be selected from among the KP CSI-RS resources remaining after excluding the P CSI-RS resources among the K CSI-RS resources.

[0332] Each of the above LP CRIs may include bits indicating which of the KP CSI-RS resources each CRI is associated with.

[0333] The total number of bits included in each CRI can be determined based on KP.

[0334] The above CSI report may relate to a Type-2 CSI codebook (e.g., enhanced Type 2). The combination of parameters constituting the Type-2 CSI codebook may be set in common for the L CSI resources.

[0335] The above CSI report can be configured to individually report an RI (rank indicator) for each of the L CSI-RS resources.

[0336] The above CSI report can be configured to individually report a CQI (channel quality indicator) for each of the L CSI-RS resources.

[0337] A codebook subset restriction (CBSR) for the CSI codebook can be set for each CSI-RS resource.

[0338] In the above CSI report, the LP CSIs for the LP CSI-RS resources can be sorted according to the order in which the LP CRIs are arranged.

[0339] FIG. 13 illustrates a flow of a method performed by a base station according to one embodiment.

[0340] Referring to FIG. 13, the base station can transmit information about CSI (channel state information) reporting settings to the terminal through upper layer signaling (C05).

[0341] The base station can receive a CSI report for L CSI-RS resources among K CSI-RS (reference signal) resources set for the terminal from the terminal (C10).

[0342] Among the L CSI-RS resources, P CSI-RS resources may be determined based on information about the CSI reporting configuration, and the remaining LP CSI-RS resources may be selected by the terminal. The LP CSI-RS resources may be selected from among the KP CSI-RS resources remaining after excluding the P CSI-RS resources among the K CSI-RS resources.

[0343] The above CSI report may include LP CRIs (CSI-RS resource indicators) for the LP CSI-RS resources selected by the terminal. Each of the LP CRIs may include bits for indicating which of the KP CSI-RS resources each CRI is associated with. The total number of bits included in each CRI may be determined based on KP.

[0344] The above CSI report may relate to a Type-2 CSI codebook (e.g., enhanced Type 2). The combination of parameters constituting the Type-2 CSI codebook may be set in common for the L CSI resources.

[0345] The above CSI report can be configured to individually report an RI (rank indicator) for each of the L CSI-RS resources.

[0346] The above CSI report can be configured to individually report a CQI (channel quality indicator) for each of the L CSI-RS resources.

[0347] A codebook subset restriction (CBSR) for the CSI codebook can be set for each CSI-RS resource.

[0348] In the above CSI report, the LP CSIs for the LP CSI-RS resources can be sorted according to the order in which the LP CRIs are arranged.

[0349] Fig. 14 illustrates a communication system (1) applicable to the present disclosure.

[0350] Referring to FIG. 14, 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.

[0351] 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).

[0352] 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.

[0353] Figure 15 illustrates a wireless device applicable to the present disclosure.

[0354] Referring to FIG. 15, 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. 14.

[0355] 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.

[0356] 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.

[0357] 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.

[0358] 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.

[0359] 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.

[0360] 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.

[0361] Figure 16 illustrates another example of a wireless device applicable to the present invention. The wireless device may be implemented in various forms depending on the use case / service (see Figure 14).

[0362] Referring to FIG. 16, the wireless device (100, 200) corresponds to the wireless device (100, 200) of FIG. 15 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. 15. For example, the transceiver(s) (114) may include one or more transceivers (106, 206) and / or one or more antennas (108, 208) of FIG. 15. 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).

[0363] 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. 14, 100a), a vehicle (Fig. 14, 100b-1, 100b-2), an XR device (Fig. 14, 100c), a portable device (Fig. 14, 100d), a home appliance (Fig. 14, 100e), an IoT device (Fig. 14, 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. 14, 400), a base station (Fig. 14, 200), a network node, etc. Wireless devices may be mobile or stationary depending on the use / service.

[0364] In FIG. 16, 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 one or more processor sets. 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.

[0365] Figure 17 illustrates a vehicle or autonomous vehicle applicable to the present disclosure. The vehicle or autonomous vehicle may be implemented as a mobile robot, a car, a train, a manned or unmanned aerial vehicle (AV), a ship, or the like.

[0366] Referring to FIG. 17, 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. 16, respectively.

[0367] 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.

[0368] 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.

[0369] 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.

[0370] 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.

[0371] The present disclosure may be used in a terminal, base station, or other equipment of a wireless mobile communication system.

Claims

1. In a method performed by a terminal, Receive information about channel state information (CSI) reporting settings via higher layer signaling; Acquire CSI based on L CSI-RS resources among K CSI-RS (reference signal) resources; and Including transmitting a CSI report based on the above CSI, Among the above L CSI-RS resources, P CSI-RS resources are determined through information about the CSI reporting settings, and the remaining LP CSI-RS resources are selected by the terminal. A method wherein the CSI report includes LP CRIs (CSI-RS resource indicators) for the LP CSI-RS resources selected by the terminal.

2. In paragraph 1, A method wherein the above LP CSI-RS resources are selected from among the KP CSI-RS resources remaining after excluding the P CSI-RS resources from the K CSI-RS resources.

3. In paragraph 1, A method wherein each of the above LP CRIs includes bits indicating which of the KP CSI-RS resources each CRI is associated with.

4. In paragraph 1, A method in which the total number of bits included in each CRI is determined based on KP.

5. In paragraph 1, The above CSI report relates to the Type-2 CSI codebook, A method in which a combination of parameters constituting the above Type-2 CSI codebook is set in common to the L CSI resources.

6. In paragraph 1, A method wherein the above CSI report is configured to individually report RI (rank indicator) for each of the L CSI-RS resources.

7. In paragraph 1, A method wherein the above CSI report is configured to individually report a CQI (channel quality indicator) for each of the L CSI-RS resources.

8. In paragraph 1, A method in which a codebook subset restriction (CBSR) is set for each CSI-RS resource for the CSI codebook.

9. In paragraph 1, A method in which LP CSIs for the LP CSI-RS resources are arranged according to the order in which the LP CRIs are arranged in the CSI report.

10. A non-transitory computer-readable recording medium having recorded thereon a program for performing the method described in paragraph 1.

11. In the device, a memory configured to store instructions; and A processor configured to perform operations by executing the above instructions, The operations of the above processor are: Receive information about channel state information (CSI) reporting settings via higher layer signaling; Acquire CSI based on L CSI-RS resources among K CSI-RS (reference signal) resources; and Including transmitting a CSI report based on the above CSI, Among the above L CSI-RS resources, P CSI-RS resources are determined through information about the CSI reporting settings, and the remaining LP CSI-RS resources are selected by the terminal. The above CSI report includes LP CRIs (CSI-RS resource indicators) for the LP CSI-RS resources selected by the terminal, the device.

12. In paragraph 11, Including a transceiver, The above device is a terminal in a wireless communication system.

13. In paragraph 11, The above device is a processing device configured to control a terminal in a wireless communication system.

14. In a method performed by a base station, Transmitting information about CSI (channel state information) reporting settings to the terminal via upper layer signaling; and Including receiving a CSI report for L CSI-RS resources among K CSI-RS (reference signal) resources set in the terminal from the terminal, Among the above L CSI-RS resources, P CSI-RS resources are determined through information about the CSI reporting settings, and the remaining LP CSI-RS resources are selected by the terminal. A method wherein the CSI report includes LP CRIs (CSI-RS resource indicators) for the LP CSI-RS resources selected by the terminal.

15. In a base station for wireless communication, a memory configured to store instructions; and A processor configured to perform operations by executing the above instructions, The operations of the above processor are: Transmitting information about CSI (channel state information) reporting settings to the terminal via upper layer signaling; and Including receiving a CSI report for L CSI-RS resources among K CSI-RS (reference signal) resources set in the terminal from the terminal, Among the above L CSI-RS resources, P CSI-RS resources are determined through information about the CSI reporting settings, and the remaining LP CSI-RS resources are selected by the terminal. A base station, wherein the above CSI report includes LP CRIs (CSI-RS resource indicators) for the LP CSI-RS resources selected by the terminal.

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