Method performed by terminal or base station in wireless communication system, and device therefor

Abstract

A method performed by a terminal, according to at least one of embodiments disclosed in the present specification, comprises: determining a preference / non-preference of the terminal with respect to a plurality of physical cell IDs (PCIs); measuring M beams per PCI on the basis of the preferred PCIs of the terminal; and transmitting a terminal-initiated beam measurement report for inter-cell beam management (ICBM) on the basis of the measurement, wherein the terminal-initiated beam measurement report can include measurement values of at least N or more beams from among the M beams measured per PCI, and reference signal identification information for the at least N or more beams.

Description

Method performed by a terminal or base station 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 uplink / downlink wireless signals by a terminal or base station in a wireless communication system.

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

[0003] The existing NR standard defines that base stations provide terminals with configuration information for beam measurement / reporting for beam management. This configuration information explicitly indicates the beams that the terminal should measure / report.

[0004] Depending on the channel environment, for example, in an environment where the terminal has high mobility, the terminal must frequently perform beam measurement reports to find the optimal beam. In this case, problems such as reference signal overhead, terminal measurement / reporting overhead, and increased power consumption arise.

[0005] The technical task of the present disclosure is to provide a method and a device for efficiently performing a wireless signal transmission and reception process. For example, a method and a device for more efficiently transmitting and receiving beam measurement reports between a terminal and a base station through a UE-initiated measurement report can be provided.

[0006] Other technical challenges can be inferred from the detailed description.

[0007] A method performed by a terminal according to one aspect of the present disclosure comprises: determining a preference / dispreference of the terminal for a plurality of physical cell IDs (PCIs); measuring M beams per each PCI based on the preferred PCIs of the terminal; and transmitting a terminal-initiated beam measurement report for inter-cell beam management (ICBM) based on the measurement, wherein the terminal-initiated beam measurement report can be configured to include measurement values ​​of at least N beams among the M beams measured per each PCI and reference signal identification information for the at least N beams.

[0008] The number of the above preferred PCIs is L, and at least some of the total L*M measurement values ​​may be omitted from the terminal-initiated beam measurement report.

[0009] Measurement values ​​of at least N beams per each PCI above may always be included in the terminal-initiated beam measurement report without being omitted.

[0010] The sorting order of the measurement values ​​of at least N beams per each PCI within the terminal-initiated beam measurement report may be determined based on the average or maximum value of the measurement values ​​of M beams per each PCI.

[0011] The above terminal-initiated beam measurement report can be constructed based on a plurality of {measurement value, reference signal identification information}-pairs.

[0012] The measurement values ​​included in at least one first {measurement value, reference signal identification information}-pair among the plurality of {measurement value, reference signal identification information}-pairs may be encoded as absolute values, and the measurement values ​​included in at least one second {measurement value, reference signal identification information}-pairs may be encoded as differential values ​​with respect to the absolute values.

[0013] The above measurement values ​​encoded as absolute values ​​may include the highest measurement value per PCI.

[0014] For each absolute value, an X-bit is allocated, and for each differential value, a Y-bit is allocated, where Y can be less than X.

[0015] The above terminal-initiated beam measurement report may include information indicating which PCI each absolute value is associated with.

[0016] The terminal can transmit information about the terminal's preference / non-preference determined for the plurality of PCIs.

[0017] 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.

[0018] According to another aspect of the present disclosure, a device includes a memory for storing instructions; and a processor for performing operations by executing the instructions, wherein the operations of the processor include determining preference / dispreference of the device for a plurality of physical cell IDs (PCIs); measuring M beams per each PCI based on the preferred PCIs of the device; and transmitting a device-initiated beam measurement report for inter-cell beam management (ICBM) based on the measurement, wherein the device-initiated beam measurement report can be configured to include measurement values ​​of at least N beams among the M beams measured per each PCI and reference signal identification information for the at least N beams.

[0019] The device may further include a transceiver for transmitting or receiving a wireless signal under the control of the processor.

[0020] The above device may be a terminal in a wireless communication system.

[0021] The above device may be a processing device configured to control a terminal in a wireless communication system.

[0022] According to another aspect of the present disclosure, a base station comprises: obtaining information on preference / dispreference of a terminal for a plurality of physical cell IDs (PCIs); transmitting M beams per each PCI based on the preferred PCIs of the terminal; and receiving a terminal-initiated beam measurement report for inter-cell beam management (ICBM) from the terminal, wherein the terminal-initiated beam measurement report may include measurement values ​​of at least N beams among the M beams measured per each PCI and reference signal identification information for the at least N beams.

[0023] According to another aspect of the present disclosure, a base station comprises at least one memory for storing commands; and at least one processor for performing operations by executing the commands, wherein the operations of the at least one processor include obtaining information on preference / dispreference of a terminal for a plurality of physical cell IDs (PCIs); transmitting M beams per each PCI based on the preferred PCIs of the terminal; and receiving a terminal-initiated beam measurement report for inter-cell beam management (ICBM) from the terminal, wherein the terminal-initiated beam measurement report may include measurement values ​​of at least N beams among the M beams measured per each PCI and reference signal identification information for the at least N beams.

[0024] According to the present disclosure, wireless signal transmission and reception can be efficiently performed in a wireless communication system. For example, information regarding a UE's preferred / non-preferred cell and / or related reference signal resource set is provided to the network through UE-initiated inter-cell beam management (ICBM) beam reporting, thereby enabling the UE and the network to operate more efficiently.

[0025] Other technical effects can be inferred from the detailed description.

[0026] 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.

[0027] Figure 2 illustrates the structure of a radio frame.

[0028] Figure 3 illustrates a resource grid of slots.

[0029] Figure 4 illustrates an example of physical channels being mapped within a slot.

[0030] Figure 5 illustrates the PDSCH and ACK / NACK transmission process.

[0031] Figure 6 illustrates a PUSCH transmission process.

[0032] Figure 7 shows an example of a CSI-related procedure.

[0033] FIGS. 8 to 10 are diagrams each illustrating encoding of beam measurement values ​​according to one embodiment.

[0034] FIGS. 11 to 14 are diagrams each illustrating the alignment of report contents within a beam measurement report according to one embodiment.

[0035] FIG. 15 illustrates a flow of a method performed by a terminal according to one embodiment.

[0036] FIG. 16 illustrates a flow of a method performed by a base station according to one embodiment.

[0037] Figures 17 to 20 illustrate a communication system (1) and a wireless device applicable to the present disclosure.

[0038] 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.

[0039] As more and more communication devices demand greater communication capacity, the need for improved mobile broadband communications compared to existing Radio Access Technology (RAT) is emerging. Furthermore, massive Machine Type Communications (MTC), which connects multiple devices and objects to provide diverse services anytime, anywhere, is also a key issue to be considered in next-generation communications. Furthermore, communication system design that considers reliability and latency-sensitive services / terminals is being discussed. Accordingly, the introduction of next-generation RATs that consider enhanced Mobile BroadBand Communication (eMBB), massive MTC, and Ultra-Reliable and Low Latency Communication (URLLC) is being discussed. For convenience, this technology is referred to as NR (New Radio or New RAT) in the present invention.

[0040] For clarity of explanation, the description will focus on 3GPP NR, but the technical idea of ​​the present invention is not limited thereto.

[0041] 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.

[0042] 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.

[0043] Figure 1 is a drawing for explaining physical channels used in a 3GPP NR system and a general signal transmission method using them.

[0044] 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.

[0045] 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.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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

[0051] * N slot symb : Number of symbols in the slot

[0052] * N frame,u slot : Number of slots in the frame

[0053] * N subframe,u slot : Number of slots in a subframe

[0054] 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.

[0055] SCS (15*2^u)N slot symb N frame,u slot N subframe,u slot 60KHz (u=2)12404

[0056] 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.

[0057] 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).

[0058] 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.

[0059] 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.

[0060] Below, each physical channel is described in more detail.

[0061] 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).

[0062] 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.

[0063] 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.

[0064] - controlResourceSetId: Indicates the CORESET associated with the search space.

[0065] - monitoringSlotPeriodicityAndOffset: Indicates the PDCCH monitoring period (in slots) and the PDCCH monitoring interval offset (in slots).

[0066] - monitoringSymbolsWithinSlot: Indicates the PDCCH monitoring symbols within the slot (e.g., the first symbol(s) of the CORESET).

[0067] - nrofCandidates: AL={1, 2, 4, 8, 16} indicates the number of PDCCH candidates (one of 0, 1, 2, 3, 4, 5, 6, 8)

[0068] * 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.

[0069] Table 3 illustrates the characteristics of each search space type.

[0070] 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

[0071] Table 4 illustrates DCI formats transmitted via PDCCH.

[0072] 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

[0073] 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.

[0074] 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.

[0075] 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.

[0076] PUCCH carries Uplink Control Information (UCI). UCI includes:

[0077] - SR (Scheduling Request): Information used to request UL-SCH resources.

[0078] - 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.

[0079] - 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).

[0080] 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).

[0081] 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)

[0082] 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.

[0083] 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).

[0084] 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.

[0085] 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.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] 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:

[0090] - Frequency domain resource assignment: Indicates the set of RBs allocated to the PDSCH.

[0091] - 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).

[0092] - PDSCH-to-HARQ_feedback timing indicator: Indicates K1

[0093] - HARQ process number (4 bits): Indicates the HARQ process ID (Identity) for data (e.g., PDSCH, TB)

[0094] - PUCCH resource indicator (PRI): Indicates the PUCCH resource to be used for UCI transmission among multiple PUCCH resources within the PUCCH resource set.

[0095] 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.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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.

[0100] 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.

[0101] 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.

[0102] 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.

[0103] - Frequency domain resource assignment: Indicates the set of RBs allocated to PUSCH.

[0104] - 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.

[0105] 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.

[0106] CSI-related actions

[0107] Figure 7 shows an example of a CSI-related procedure.

[0108] 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.

[0109] - 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.

[0110] - 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.

[0111] - 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.

[0112] - 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.

[0113] - 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.

[0114] 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).

[0115] 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.

[0116] 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.

[0117] Beam Management (BM)

[0118] BM procedures are L1 (layer 1) / L2 (layer 2) procedures for acquiring and maintaining a set of base station (e.g., gNB, TRP, etc.) and / or terminal (e.g., UE) beams that can be used for downlink (DL) and uplink (UL) transmission / reception, and may include the following procedures and terminology.

[0119] - Beam measurement: An operation in which a base station or UE measures the characteristics of a received beam-forming signal.

[0120] - Beam determination: An operation in which a base station or UE selects its own transmit beam (Tx beam) / receive beam (Rx beam).

[0121] - Beam sweeping: The operation of covering a spatial area using a transmit and / or receive beam over a predetermined time interval in a predetermined manner.

[0122] - Beam report: An operation in which a UE reports information about a beam-formed signal based on beam measurement.

[0123] The BM procedure can be divided into (1) a DL BM procedure using SS (synchronization signal) / PBCH (physical broadcast channel) Block or CSI-RS, and (2) a UL BM procedure using SRS (sounding reference signal).

[0124] Additionally, each BM procedure may include Tx beam sweeping to determine the Tx beam and Rx beam sweeping to determine the Rx beam.

[0125] DL BM

[0126] The DL BM procedure may include transmission of beamformed DL RSs (reference signals) (e.g., CSI-RS or SS Block (SSB)) of the base station and beam reporting of the terminal.

[0127] Here, beam reporting may include preferred DL RS ID(identifier)(s) and corresponding L1-RSRP (Reference Signal Received Power).

[0128] The above DL RS ID may be an SSBRI (SSB Resource Indicator) or a CRI (CSI-RS Resource Indicator).

[0129] Both SSB and CSI-RS beams can be used for beam measurement. The measurement metric is L1-RSRP per resource / block. SSB is used for coarse beam measurement, and CSI-RS can be used for fine beam measurement. SSB can be used for both Tx beam sweeping and Rx beam sweeping.

[0130] (1) SSB beam

[0131] Rx beam sweeping using SSB can be performed by the UE changing the Rx beam for the same SSBRI across multiple SSB bursts, where one SS burst contains one or more SSBs, and one SS burst set contains one or more SSB bursts.

[0132] The configuration for beam reporting using SSB is performed during CSI / beam configuration in the RRC connected state (or RRC connected mode). The terminal receives a CSI-ResourceConfig IE containing a CSI-SSB-ResourceSetList containing SSB resources used for BM from the base station.

[0133] (2) CSI-RS beam

[0134] Looking at the usage of CSI-RS, i) if the repetition parameter is set to a specific CSI-RS resource set and trs-Info is not set, CSI-RS is used for beam management. ii) if the repetition parameter is not set and trs-Info is set, CSI-RS is used for TRS (tracking reference signal). iii) if the repetition parameter is not set and trs-Info is not set, CSI-RS is used for CSI acquisition.

[0135] This repetition parameter can only be set for CSI-RS resource sets associated with a CSI-ReportConfig that is set to report L1 RSRP or 'No Report (or None)'.

[0136] If the terminal receives a CSI-ReportConfig with reportQuantity set to 'cri-RSRP', 'cri-SINR' or 'none', and if the CSI-ResourceConfig for channel measurement (higher layer parameter resourcesForChannelMeasurement) includes an NZP-CSI-RS-ResourceSet with higher layer parameter 'repetition' set but without higher layer parameter 'trs-Info', the terminal may only configure all CSI-RS resources in the NZP-CSI-RS-ResourceSet with the same number of ports (1-port or 2-port) with the higher layer parameter 'nrofPorts'.

[0137] (higher layer parameter) When repetition is set to 'ON', it is related to the Rx beam sweeping procedure of the terminal. In this case, when the terminal receives an NZP-CSI-RS-ResourceSet with repetition set to 'ON', the terminal can assume that at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is transmitted through the same downlink spatial domain transmission filter. That is, at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is transmitted through the same Tx beam. Here, at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet can be transmitted in a different OFDM symbol. In addition, the terminal does not expect to receive different periods in periodicityAndOffset among all CSI-RS resources in the NZP-CSI-RS-Resourceset.

[0138] On the other hand, when Repetition is set to 'OFF', it is related to the Tx beam sweeping procedure of the base station. In this case, when repetition is set to 'OFF', the terminal does not assume that at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is transmitted through the same downlink spatial domain transmission filter. That is, at least one CSI-RS resource in the NZP-CSI-RS-ResourceSet is transmitted through a different Tx beam.

[0139] - The terminal receives an NZP CSI-RS resource set IE including a higher layer parameter repetition from the base station via RRC signaling. Here, the repetition parameter is set to 'ON'.

[0140] - The terminal repeatedly receives CSI-RS resource(s) within the NZP CSI-RS resource set with repetition 'ON' in different OFDM symbols through the same Tx beam (or DL ​​spatial domain transmission filter) of the base station.

[0141] - The terminal determines its own Rx beam.

[0142] - The terminal omits the CSI report. In this case, the reportQuantity of the CSI report config can be set to 'No report (or None)'.

[0143] That is, the terminal can omit the CSI report when repetition is set to 'ON'.

[0144] DL BM related beam indication

[0145] A UE may receive an RRC configuration list of at most M candidate Transmission Configuration Indication (TCI) states for the purpose of at least a Quasi Co-location (QCL) indication. Here, M may vary depending on the capability of the UE and may be, for example, 64.

[0146] Each TCI state can be configured with one RS set. At least each ID of a DL RS for spatial QCL purposes (QCL Type D) within an RS set can refer to one of the DL RS types, such as SSB, P-CSI RS, SP-CSI RS, or A-CSI RS.

[0147] At least the initialization / update of the IDs of DL RS(s) within the RS set used for spatial QCL purposes can be performed at least through explicit signaling.

[0148] Rel-16 / 17 enhancement

[0149] In Rel-16, enhancements were made not only for beam / PL RS indication but also for beam reporting. Rel-15 supports a mode in which the terminal measures / reports the L1-RSRP for each beam RS. However, in an environment with high inter-beam interference, it is difficult to guarantee that the RS has good quality as a serving beam just because the L1-RSRP of a specific beam RS is high, i.e., the reception intensity is high. In other words, the terminal may select a beam with high reception intensity but also high beam interference and report it to the base station. To overcome this drawback, Rel-16 newly supports a beam reporting mode in which the base station sets resources for interference measurement as well as RS for channel measurement, and the terminal measures the L1-SINR for the corresponding channel resource and interference resource based on this and reports several RSs with high L1-SINR values.

[0150] In this way, various BM enhancements were made in Rel-16. In particular, features were created that can significantly reduce signaling overhead / latency related to beam indication methods. However, beams were still not configured / indicated in an integrated channel / RS manner for terminals operating with a single serving beam. Based on this motivation, Rel-17 standardized a method for integrated channel / RS beam configuration / indication. In NR, DL beams are indicated through the transmit configuration indicator (TCI), so this is called the unified TCI state. While the existing TCI state was configured / indicated separately for each DL RS / channel, the unified TCI state is characterized by integrated configuration / indication. Basically, the DL unified TCI state indicates QCL type-D RS that is integrated and applied to (some) PDCCH, PDSCH, and (some) CSI-RS resources, and the UL unified TCI state indicates spatial relation RS (and PL RS) that is integrated and applied to (some) PUCCH, PUSCH, and (some) SRS resources. In addition, similar to the Rel-16 default spatial relation / PL RS feature, the UL spatial relation and PL RS can also be aligned with the DL beam RS for UEs that establish beam correspondence, so the channels / RSs to which the unified TCI state is applied can encompass both DL and UL channels / RSs. This is called a joint DL / UL TCI state. That is, the following two modes are supported.

[0151] - Joint DL / UL TCI Setting / Instruction Mode: The DL RS set / instructed as the Joint TCI state is applied not only as the QCL type-D source RS for the DL channel / RS, but also as the spatial relation RS (and PL RS) for the UL channel / RS. That is, when the joint TCI state is instructed to update, the beam RS (and PL RS) for the corresponding DL channel / RS and UL channel / RS are changed together.

[0152] - Separate DL and UL TCI setting / indication mode: QCL type-D source RS for DL ​​channels / RSs are integrated and set / indicated to the DL TCI state, and spatial relation RS (and PL RS) for UL channels / RSs are integrated and set / indicated to the UL TCI state. Here, the DL TCI state and UL TCI state are separately set / indicated.

[0153] The above DL / UL / joint TCI states will be indicated / updated via MAC-CE and / or DCI. More specifically, one or more TCI states will be activated via MAC-CE among multiple TCI states configured via RRC (called TCI state pool). If multiple TCI states are activated via MAC-CE, one of the TCI states will be indicated via DCI. This DCI indication will be supported via downlink DCI formats (DCI1-1 / 1-2) that support the TCI field, and can be supported both with and without PDSCH scheduling. In the latter case, since PDSCH scheduling is omitted (similar to the DCI-based semi-persistent scheduling (SPS) release method), ACK transmission by the terminal for the corresponding DCI can be supported.

[0154] The Rel-17 beam report mode can support a mode in which the terminal measures / reports the optimal beam RS for each TRP, targeting a multi-TRP environment. To this end, the beam measurement RS set / group can be divided into two subsets / sub-groups, which the base station configures, and the terminal can then select RS(es) for each subset / sub-group and report them along with the quality value (L1-RSRP, [L1-SINR]) of the corresponding RS.

[0155] QCL (quasi-co location)

[0156] 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.

[0157] Regarding PDCCH / PDSCH QCL, multiple Transmission Configuration Indication (TCI) states can be configured to the terminal via higher layer signaling. Up to 64 TCI states can be configured via RRC for PDCCH QCL, and up to 128 TCI states can be configured via RRC for PDSCH QCL. For PDSCH QCL, a list for configuring multiple TCI-States can be provided via the higher layer parameter PDSCH-Config.

[0158] 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 / PDSCH. The QCL configuration parameter may include qcl-Type1 for the first DL RS and qcl-Type2 for the second DL RS. The QCL type may correspond to one of the following:

[0159] - 'QCL-TypeA': {Doppler shift, Doppler spread, average delay, delay spread}

[0160] - 'QCL-TypeB': {Doppler shift, Doppler spread}

[0161] - 'QCL-TypeC': {Doppler shift, average delay}

[0162] - 'QCL-TypeD': {Spatial Rx parameter}

[0163] TCI states set through RRC signaling are deactivated by default.

[0164] For PDSCH QCL, up to eight TCI states can be activated through MAC CE among the RRC configured TCI states. The TCI field included in the DCI scheduling the PDSCH can indicate one of the activated TCI states (e.g., if the provision of the TCI field in the corresponding DCI is activated via RRC signaling), and the UE can receive the PDSCH based on the QCL information corresponding to the indicated TCI state.

[0165] For PDCCH QCL, one TCI state can be activated for the corresponding CORESET through MAC CE among the RRC configured TCI states. To receive the PDCCH in the corresponding CORESET, the UE can receive the PDCCH based on the QCL information corresponding to the activated TCI state.

[0166] M-TRP (multiple-transmission / reception point) related operations

[0167] The M-TRP transmission method, in which M TRPs transmit data to one terminal, can be broadly divided into two types: eMBB M-TRP transmission, which is a method for increasing the transmission rate, and URLLC M-TRP transmission, which is a method for increasing the reception success rate and reducing latency.

[0168] Meanwhile, the DL M-TRP URLLC transmission method refers to a method in which multiple TRPs transmit the same data / DCI using different space (e.g., layer / port) / time / frequency resources. For example, TRP 1 can transmit specific data / DCI in resource 1, and TRP 2 can transmit the specific data / DCI (i.e., the same data / DCI) in resource 2.

[0169] That is, when the DL M-TRP URLLC transmission method is set, the terminal can receive the same data / DCI using different space / time / frequency resources. At this time, the terminal can receive an indication from the base station about the QCL RS / type (i.e., DL TCI state) used in the space / time / frequency resources for receiving the corresponding data / DCI.

[0170] For example, if the corresponding data / DCI is received from resource 1 and resource 2, the terminal can be instructed by the base station about the DL TCI state used in resource 1 and the DL TCI state used in resource 2. By receiving the corresponding data / DCI through resource 1 and resource 2, high reliability can be achieved. This M-TRP URLLC transmission method can be applied to PDSCH / PDCCH.

[0171] UL M-TRP URLLC transmission method refers to a method in which multiple TRPs receive the same data / UCI from a terminal using different space / time / frequency resources. For example, TRP 1 can receive the same data / UCI from a terminal on resource 1, and TRP 2 can receive the same data / UCI from a terminal on resource 2. In addition, TRP 1 and TRP 2 can share the data / UCI received from the terminal through a backhaul link (connected between TRPs).

[0172] That is, when the UL M-TRP URLLC transmission method is set, the terminal can transmit the same data / UCI to each TRP using different space / time / frequency resources. At this time, the terminal can be instructed by the base station about the Tx beam and Tx power (i.e., UL TCI state) to be used in the space / time / frequency resources for transmitting the same data / UCI. For example, when the same data / UCI is transmitted in resource 1 and resource 2, the terminal can be instructed by the base station about the UL TCI state used in resource 1 and the UL TCI state used in resource 2. This UL M-TRP URLLC can be applied to PUSCH / PUCCH.

[0173] In addition, from the perspective of DCI transmission, the M-TRP transmission method can be divided into i) M-TRP transmission method based on M-DCI (multiple DCI) in which each TRP transmits a different DCI, and ii) M-TRP transmission method based on S-DCI (single DCI) in which one TRP transmits a DCI. For example, in the case of S-DCI, all scheduling information for data transmitted by an M-TRP must be transmitted through a single DCI, so it can be used in an ideal BH (ideal BackHaul) environment in which dynamic cooperation between two TRPs is possible.

[0174] In relation to M-TRP transmission and reception in Rel-16 NR standardization, PDSCH transmission and reception according to S-DCI-based M-TRP transmission method and M-DCI-based M-TRP transmission method are supported.

[0175] First, we will look at the S-DCI-based M-TRP PDSCH transmission method.

[0176] S-DCI-based M-TRP PDSCH transmission can use one of SDM / FDM / TDM methods. In the case of SDM, the base station transmits one TB using multiple layers, and transmits layers belonging to different DMRS CDM groups using different transmit beams (i.e., QCL RS or TCI states). This can increase the number of layers compared to the existing S-TRP transmission method, thereby improving transmission capacity. In addition, when one TB is transmitted using multiple layers, some layers are transmitted to TRP 1 and the remaining layers are transmitted to TRP 2, which can improve channel reliability due to diversity gain.

[0177] For FDM, two schemes, scheme 2a and 2b, are supported. Here, scheme 2a transmits one TB to multi-RBs, but transmits RBs belonging to different RB groups with different Tx beams (i.e., QCL RS or TCI states). Scheme 2b transmits the same TB to different RB groups, but transmits RBs belonging to different RB groups with different Tx beams (i.e., QCL RS or TCI states). For TDM, two schemes, scheme 3 and 4, are supported. Here, scheme 4 (i.e., inter-slot TDM) repeatedly transmits the same TB in multiple slots, but transmits slots belonging to different slot groups with different Tx beams (i.e., QCL RS or TCI states). On the other hand, Scheme 3 (i.e., intra-slot TDM) repeatedly transmits the same TB in multiple OFDM symbol groups, but transmits some OFDM symbol groups and the remaining OFDM symbol groups with different Tx beams (i.e., QCL RS or TCI state).

[0178] Next, we will look at the M-DCI-based M-TRP PDSCH transmission method.

[0179] M-DCI based MTRP PDSCH transmission is a method in which each TRP schedules and transmits PDSCH through DCI. That is, TRP 1 transmits PDSCH 1 through DCI 1, and TRP 2 transmits PDSCH 2 through DCI 2. When PDSCH 1 and PDSCH 2 overlap in the same frequency / time resource, two PDSCHs are received for the same RE, which increases resource efficiency and increases transmission capacity. To this end, the concept of a CORESET pool, which refers to a group of multiple CORESETs, was introduced. For example, TRP 1 transmits a PDCCH through a CORESET belonging to CORESET pool 0, and also transmits the PDSCH scheduled by the PDCCH. TRP 2 transmits a PDCCH through a CORESET belonging to CORESET pool 1, and also transmits the PDSCH scheduled by the PDCCH.

[0180] Even for PUSCH, specific TRPs can schedule PUSCH transmissions to UEs via CORESETs within each COERSET pool. For example, some PUCCH resources may be scheduled by TRP 1, while the remaining PUCCH resources may be scheduled by TRP 2. UEs can transmit independent PUSCH / PUCCHs for each of TRPs 1 and 2.

[0181] In addition, the terminal may recognize the PUSCH (or PUCCH) scheduled by the DCI received based on different CORESETs (or CORESETs belonging to different CORESET groups) as a PUSCH (or PUCCH) transmitted to different TRPs or as a PUSCH (or PUCCH) of different TRPs. In addition, the method for UL transmission (e.g., PUSCH / PUCCH) transmitted to different TRPs can be equally applied to UL transmission transmitted to different panels belonging to the same TRP.

[0182] Hereinafter, the CORESET group ID (or COERSET pool index having the same meaning) may mean an index / identification information (e.g., ID) for distinguishing the CORESET for each TRP / panel. And the CORESET group may mean a group / union of CORESETs distinguished by an index / identification information (e.g., ID) / CORESET group ID for distinguishing the CORESET for each TRP / panel. For example, the CORESET group ID may be specific index information defined in the CORESET configuration. That is, the CORESET group may be set / indicated / defined by an index defined in the CORESET configuration for each CORESET. And / or, the CORESET group ID may mean an index / identification information / indicator for distinguishing / identifying between the CORESETs set / associated in each TRP / panel.

[0183] Hereinafter, the CORESET group ID may be replaced with a specific index / specific identification information / specific indicator for distinguishing / identifying the CORESETs set / associated with each TRP / panel. The information may be set / indicated via higher layer signaling (e.g., RRC signaling, MAC-CE, etc.) and / or physical layer signaling (e.g., DCI). For example, PDCCH detection may be set / indicated to be performed for each TRP / panel in units of the corresponding CORESET group, and UCI (e.g., CSI, HARQ-ACK / NACK, SR, etc.) and / or uplink physical channel resources (e.g., PUCCH / PRACH / SRS resources) may be set / indicated to be managed / controlled separately for each TRP / panel in units of the corresponding CORESET group. And / or, HARQ ACK / NACK (process / retransmission) for PDSCH / PUSCH, etc. scheduled for each TRP / panel by CORESET group unit can be managed.

[0184] For example, the upper layer parameter ControlResourceSet IE (information element) may include a CORESET related ID (e.g., controlResourceSetID) / CORESET pool index for CORESET (e.g., CORESETPoolIndex) / time / frequency resource settings of CORESET / TCI information related to CORESET, etc. For example, the index of the CORESET pool (e.g., CORESETPoolIndex) may be set to 0 or 1. In the description above in the present disclosure, a CORESET group may correspond to a CORESET pool, and a CORESET group ID may correspond to a CORESET pool index (e.g., CORESETPoolIndex).

[0185] Additionally, with respect to M-TRP transmission and reception in Rel-17 NR standardization, M-TRP PDCCH / PDSCH SFN transmission, S-DCI-based M-TRP PUSCH repeated transmission, and single PUCCH resource-based M-TRP PUCCH repeated transmission are supported. These transmission techniques repeatedly transmit the same contents (i.e., DCI / UL TB / UCI, etc.) with improved URLLC target for increased reliability. Here, M-TRP PDCCH repeated transmission is performed based on TDM or FDM, M-TRP PDCCH / PDSCH SFN transmission is performed in the same time / frequency / layer, S-DCI-based M-TRP PUSCH repeated transmission is performed based on TDM, and single PUCCH resource-based M-TRP PUCCH repeated transmission is performed based on TDM.

[0186] First, we will look at the S-DCI-based M-TRP PDCCH repetition transmission method.

[0187] In the NR Rel-17 standardization, multiple CORESETs with different TCI states (i.e., different QCL RSs) are configured for the UE for repeated M-TRP PDCCH transmission, and multiple SS (Search Space) sets are configured, each linked to the corresponding CORESETs. The base station can instruct / configure the UE that the SS set connected to one CORESET and the SS set connected to another CORESET are linked for repeated transmission. Through this, the UE can be informed that the PDCCH candidates of the corresponding SS set are being repeatedly transmitted.

[0188] For example, two CORESETs, CORESET 0 and CORESET 1, may be set for a terminal, CORESET 0 and CORESET 1 may be connected to SS set 0 and SS set 1, respectively, and SS set 0 and SS set 1 may be linked. The terminal may recognize that the same DCI has been repeatedly transmitted in the PDCCH candidate of SS set 0 and the PDCCH candidate of SS set 1, and may recognize that a specific PDCCH candidate of SS set 0 and a specific PDCCH candidate of SS set 1 are a pair set for repeatedly transmitting the same DCI based on a specific rule. The two PDCCH candidates are referred to as linked PDCCH candidates, and the terminal may successfully decode the corresponding DCI if it properly receives either of the two PDCCH candidates. However, when receiving a PDCCH candidate of SS set 0, the terminal may use the QCL RS (i.e., DL beam) of the TCI state of COERSET 0 connected to SS set 0, and when receiving a PDCCH candidate of SS set 1, the terminal may use the QCL RS (i.e., DL beam) of the TCI state of COERSET 1 connected to SS set 1. Accordingly, the terminal receives linked PDCCH candidates using different beams.

[0189] Next, we will look at the M-TRP SFN PDCCH / PDSCH transmission method.

[0190] M-TRP is a type of PDCCH repetition transmission, in which multiple TRPs can repeatedly transmit the same DCI through the same time / frequency / DMRS port. This transmission method can be referred to as SFN PDCCH transmission. However, for SFN PDCCH transmission, instead of configuring multiple CORESETs with different TCI states, the base station configures multiple TCI states in a single CORESET. When a terminal receives a PDCCH candidate through an SS set connected to a single CORESET, it can perform channel estimation of the PDCCH DMRS using all of the multiple TCI states and attempt decoding.

[0191] In addition, when the above-described M-TRP PDSCH is repeatedly transmitted, the two TRPs repeatedly transmit the corresponding channel on different resources. However, if the two TRPs use the same resource, that is, if the same channel is repeatedly transmitted through the same frequency / time / layer (i.e., DMRS port), the reliability of the corresponding channel can be improved. In this case, the repeatedly transmitted same channel is not distinguished in terms of resources, so it is received by being combined during transmission (i.e., over the air), and thus can be recognized as a single channel (e.g., a composite channel) from the perspective of the receiving end (e.g., a terminal). For SFN PDSCH transmission, two DL TCI states for PDSCH DMRS reception can be set for the terminal.

[0192] Next, we will look at the S-DCI-based M-TRP PUSCH repetitive transmission scheme.

[0193] In NR Rel-17 standardization, the base station configures two SRS sets for the UE for S-DCI-based M-TRP PUSCH transmission, and each set is used to indicate the UL Tx port and UL beam / QCL information for TRP 1 and TRP 2, respectively. In addition, the base station can indicate SRS resources for each SRS resource set through two SRI fields included in one DCI, and can indicate up to two PC parameter sets. For example, the first SRI field can indicate the SRS resources and PC parameter set defined in SRS resource set 0, and the second SRI field can indicate the SRS resources and PC parameter set defined in SRS resource set 1. The UE can be indicated the UL Tx port, PC parameter set, and UL beam / QCL information for TRP 1 through the first SRI field, and through this, the UE performs PUSCH transmission in the TO corresponding to SRS resource set 0. Similarly, the terminal can be instructed about the UL Tx port, PC parameter set, and UL beam / QCL information for TRP 2 through the second SRI field, and through this, the terminal performs PUSCH transmission in the TO corresponding to SRS resource set 1. In addition to the SRI field, the TPMI, PTRS, and TPC fields can also be instructed for each TRP, so that the existing single field is expanded into two fields. In addition, by introducing a 2-bit SRS resource set indication field, STRP PUSCH repeated transmission can be performed by selecting a specific one of the two SRS sets, and MTRP PUSCH repeated transmission can be performed by selecting both.That is, if the field is 00, 01, SRS set 0 and SRS set 1 are indicated respectively, and STRP PUSCH transmission corresponding to each set is performed. If it is 10, (SRS set 0, SRS set 1) is indicated, and MTRP PUSCH transmission is performed in the indicated order of set pairs. That is, set 0 corresponds to the first PUSCH TO. If it is 11, (SRS set 1, SRS set 0) is indicated, and MTRP PUSCH transmission is performed in the indicated order of set pairs. That is, set 1 corresponds to the first PUSCH TO.

[0194] Next, we examine a single PUCCH resource-based M-TRP PUCCH repetition transmission scheme.

[0195] In NR Rel-17 standardization, for M-TRP PUCCH transmission based on a single PUCCH resource, a base station can activate / configure two spatial relation info (if FR1, activate / configure two PC parameter sets) for a single PUCCH resource to a UE. When UL UCI is transmitted through the PUCCH resource, each spatial relation info is used to indicate spatial relation info toward TRP 1 and TRP 2 to the UE. For example, through the value indicated in the first spatial relation info, the UE is instructed with Tx beam / PC parameter(s) toward TRP 1, and the UE performs PUCCH transmission at the TO corresponding to TRP 1 using the information. Similarly, through the value indicated in the second spatial relation info, the UE is instructed with Tx beam / PC parameter(s) toward TRP 2, and the UE performs PUCCH transmission at the TO corresponding to TRP 2 using the information.

[0196] In addition, for M-TRP PUCCH repeated transmission, the configuration method has been improved so that two new spatial relation info can be configured for a PUCCH resource. That is, if PC (power control) parameters such as PLRS, Alpha, P0, and Closed loop index are configured for each spatial relation info, a spatial relation RS can be configured. Consequently, PC information and spatial relation RS information corresponding to two TRPs can be configured through two spatial relation info. Through this, the terminal transmits a UCI (i.e., CSI, ACK / NACK, SR, etc.) PUCCH using the first spatial relation info in the first TO, and transmits the same UCI PUCCH using the second spatial relation info in the second TO. In the present disclosure, a PUCCH resource with two spatial relation info configured is referred to as an M-TRP PUCCH resource, and a PUCCH resource with one spatial relation info configured is referred to as an S-TRP PUCCH resource.

[0197] TCI (transmission configuration indication) state / beam indication

[0198] In addition, in describing the present disclosure, when receiving / transmitting data / DCI / UCI through specific space / time / frequency resources, using (or mapping) a specific TCI state (or TCI) may mean, in the case of DL, estimating a channel from a DMRS using a QCL type and QCL RS indicated by the specific TCI state in the specific space / time / frequency resources, and receiving / demodulating data / DCI / UCI with the estimated channel.

[0199] And, when receiving / transmitting data / DCI / UCI through specific space / time / frequency resources, using (or mapping) a specific TCI state (or TCI) may mean, in the case of UL, transmitting / modulating DMRS and data / UCI using a Tx beam and / or Tx power indicated by a specific TCI state in a specific space / time / frequency resource.

[0200] In addition, the UL TCI state may include Tx beam or Tx power information of the terminal. In addition, the base station may set other parameters, such as spatial relation information, to the terminal instead of the TCI state.

[0201] For example, the UL TCI state can be directly indicated to the UE via the UL grant DCI. Alternatively, the UL TCI state can mean spatial relationship information of SRS resources indicated via the SRI (SRS resource indicator) field of the UL grant DCI. Alternatively, the UL TCI state can mean an open loop (OP) Tx power control parameter linked to a value indicated via the SRI field of the UL grant DCI.

[0202] Here, the OL Tx power control parameters may include, for example, j (index for OP parameter(s) Po and alpha (set of up to 32 parameter values ​​per cell), q_d (index of DL RS resources for path loss (PL) measurement (up to 4 measurements per cell), or / and I (closed-loop power control process index (up to 2 processes per cell)).

[0203] For the convenience of explanation of the present disclosure, it is assumed that two TRPs cooperate with each other to perform transmission / reception operations, but this is not limited thereto. That is, the present disclosure can be expanded to a multi-TRP environment of three or more, and can also be expanded to an environment in which transmission / reception is performed using different panels or beams in the same TRP. A terminal can recognize different TRPs as having different TCI states. When a terminal transmits / receives data / DCI / UCI using TCI state 1, it means that it transmits / receives data / DCI / UCI / from TRP 1 (or to TRP 1).

[0204] TO(Transmission Occasion) refers to each channel transmitted at a different time when multiple channels are TDMed, each channel transmitted on a different frequency / RB when multiple channels are FDMed, and each channel transmitted on a different layer / beam / DMRS port when multiple channels are SDMed. Each TO can be mapped to one TCI state. When the same channel is repeatedly transmitted, complete data / DCI / UCI is transmitted on one TO, and the receiver can receive multiple TOs to increase the reception success rate.

[0205] Single DCI based multi-TB PUSCH / PDSCH scheduling

[0206] In Rel.17 NR, a method for scheduling multiple PUSCH / PDSCH simultaneously with a single DCI is supported in the ultra-high frequency band (beyond 5.26 GHz). For example, multiple TDRAs (=TOs) can be indicated at once through the TDRA field of the PUSCH scheduling DCI, and a different TB is transmitted via the PUSCH for each TO. The FDRA, MCS, TPMI, and SRI values ​​of the DCI are commonly applied to multiple scheduled TBs. In addition, the NDI and RV for each TB are individually indicated through the DCI, and a single HARQ number is indicated, but they sequentially increase in the order of the TOs based on the initial TO.

[0207] STxMP (simultaneous transmission across multiple panels)

[0208] Recently, for the Rel. 18 NR standardization, methods for UEs to simultaneously transmit multiple channels / RSs of the same type or multiple channels / RSs of different types are being discussed. In the case of existing UEs, the operation of transmitting multiple channels / RSs at a time is restricted (e.g., simultaneous transmission of multiple SRS resources of different SRS sets is possible for UL beam measurement, but simultaneous transmission of multiple PUSCHs is not possible). However, in the future, advanced UEs will be able to relax these restrictions and transmit multiple channels or RSs simultaneously using multiple transmission panels. Such UEs are called STxMP UEs. For example, two PUSCHs corresponding to two UL TBs are scheduled on the same RE, and Spatial relation RS 1 and PC parameter Set 1 (i.e., UL TCI state 1) and Spatial relation RS 2 and PC parameter Set 2 (i.e., UL TCI state 2) are set for PUSCH 1 and 2 transmission, respectively. The UE transmits PUSCH 1 using panel 1 corresponding to UL TCI state 1 and simultaneously transmits PUSCH 2 using panel 2 corresponding to UL TCI state 2.

[0209] When a base station schedules a PUSCH through DCI, it can indicate whether the PUSCH will be transmitted as STxMP, as a single panel, or as MTRP PUSCH repetitions. Of course, the UE must have STxMP capability, and the STxMP mode must be enabled in advance, such as through RRC signaling. To achieve this, the existing SRS resource set indication field can be redefined and used, or a new DCI field can be introduced.

[0210] UCI encoding method of UE-initiated beam report for inter-cell BM and MTRP

[0211] For UE-initiated beam reports considering inter-cell beam management and inter-cell MTRP, we propose a method for encoding and configuring report contents.

[0212] In the following description, 'beam' can mean source RS for 'spatial filter' or 'spatial relation', and can be interpreted as QCL (type-D) RS or (DL / UL / joint) TCI state or (in case of uplink) spatial relation RS. Beam measurement can mean measurement of a signal (e.g., reference signal) transmitted and received through the beam / beamforming. In addition, for convenience, a cell having a specific PCI can be simply referred to as PCI.

[0213] Currently, in NR, beam measurement / reporting methods and beam activation / indication of the base station are defined for beam management (BM). For example, the beam measurement / reporting of a terminal is set / instructed by the base station, and the base station can perform beam activation and beam indication instructions to the terminal based on the beam measurement / reporting of the terminal.

[0214] In NR Rel-17, beam measurement reporting for ICBM and inter-cell MTRP operations was agreed upon as shown in Table 6. The encoding method for the information included in the report is also included.

[0215] Regarding Rel.17 multi-beam measurement / reporting enhancements for L1 / L2-centric inter-cell mobility and inter-cell mTRP:- The quality of up to Kmax beams associated with non-serving cells can be reported in a single CSI reporting instance.- For each beam, the UE can report at least (1) the measured RS indicator and (2) the beam metric associated with the measured RS indicator:- The network can mix beams associated with non-serving cells with beams associated with serving cells in a single reporting instance.- Supports at least K=4, where K is defined as the number of beams associated with non-serving cells reported in a single CSI reporting instance.- The maximum value of K, Kmax, is UE capability.- K is configured by the network according to UE capability.- For K>4, the maximum number of beams associated with a cell is 4.*Note: The above may also apply if beam metrics other than L1-RSRP are supported. Regarding Rel.17 enhancements for ICBM and inter-cell mTRP About:- L1-RSRP reporting reuses the Rel-15 L1-RSRP table.- N MAX (The maximum number of PCIs that can be RRC configured differently from the serving cell for measurement / reporting) may vary depending on the UE capability, and its candidate values ​​include at least 1 and X. - N MAXWhen is set to X, the UE may be RRC configured to measure L1-RSRP for up to X different PCIs from the serving cell PCI. - The Rel-15 L1-RSRP reporting format is reused for all SSBRI-RSRP pairs in one L1-RSRP reporting instance, i.e., for K>1, (K-1) 4-bit differential L1-RSRP are computed for the reference (absolute) 7-bit L1-RSRP. - The CSI-SSB-ResourceSet configured for L1-RSRP measurement / reporting contains at least one set of SSB indices, each of which is associated with a PCI index. A PCI index refers to a PCI within a PCI set configured for ICBM or inter-cell multi-TRP.

[0216] Based on Table 6, beam measurements / reports to support ICBMs can be summarized as follows.

[0217] Multi-beam measurement report for L1 / L2-centered ICBM / MTRP

[0218] (1) Measurement reference signal

[0219] 1) SSB is supported, and L1-RSRP is used as the reporting quantity.

[0220] 2) The CSI-SSB-ResourceSet configured for L1-RSRP measurement / reporting includes a set of at least one SSB indices.

[0221] i. A set of SSB indices and PCI indices are linked respectively.

[0222] ii. AdditionalInfo associated with SSB(s) different from the PCI(s) of the serving cell may also be applied to the ICBM.

[0223] 3) Nmax (the number of PCIs RRC configured differently from the serving cell for measurement / reporting) is a UE capability, and candidate values ​​include 1 to 7.

[0224] i. When Nmax is set to X, L1-RSRP measurements for up to X PCIs different from the serving cell PCI can be configured in RRC on the terminal.

[0225] (2) Report content

[0226] 1) Quality and measured RS indicators of up to 4 beams

[0227] 2) In one reporting instance, beams associated with non-serving cells can be mixed with associated serving cell beams.

[0228] 3) L1-RSRP reporting reuses the Rel-15 L1-RSRP table / format.

[0229] In particular, as an example of the encoding method of the reporting contents to be covered in this specification, the existing Rel-15 method can be reused as a method for expressing beam quality for up to 4 values, so that the value with the best quality can be expressed as an absolute value through 7 bits, and the remaining beam quality values ​​can be expressed as differential values ​​based on the absolute value using 4 bits.

[0230] Meanwhile, the problem with the current ICBM beam measurement / reporting process is that in environments where the terminal moves a lot or when there is a lot of movement of objects around the terminal, beam measurement / reporting must be performed frequently to find the optimal beam, which causes problems such as RS overhead and power consumption for transmitting the corresponding RSs on the base station side, implementation burden due to terminal measurement / reporting, and increased power consumption.

[0231] N set to RRC as described above maxSince the terminal must measure the measurement RSs of non-serving cell(s) every time according to the value, the terminal power consumption may increase depending on the number of measurement RSs. And / or, depending on the configuration of the base station, the terminal may also perform measurements for RSs for PCI(s) that do not have a large impact on the terminal in terms of signal strength or channel characteristics according to the distance from the cell / TRP, which may further increase the terminal power consumption. In addition, as explained above, for ICBM / MTRP purposes, the measurement RSs of non-serving cell(s) are added according to the measurement RS configuration, so when measuring / reporting based on the RSs, the size of the indication field (e.g. CRI / SSBRI field) for indicating a specific RS ID used for measurement / reporting increases, and if it is based on the preset RS configuration, the size of the indication field is fixed for each report instance, so there is an overhead accordingly.

[0232] In the Rel-19 standardization discussion, it was agreed to standardize the following to introduce a process in which beam reports are triggered based on changes in beam quality at the terminal level, rather than beam measurement / reporting by the terminal set / instructed by the base station, and beam instructions are performed accordingly:

[0233] Define UE-initiated / event-based beam management to reduce overhead and / or latency, assume unified TCI but leverage the framework of existing CSI measurement reporting settings where possible, and target FR2 and intra-cell / inter-cell STRP.

[0234] - UL signaling content for UE-initiated / event-based beam reporting for rapid beam switching

[0235] - UL signaling means / container considering the UE-initiated / event-driven characteristics of UE transmissions designed primarily for beam reporting purposes.

[0236] Currently supported NR beam measurements / reporting are performed by base station configuration / instruction. Specifically for ICBMs, the number of RSs a terminal must measure increases with the number of non-serving cells configured, exacerbating the problem of terminal power consumption and base station power consumption due to transmitting these RSs in a pre-configured manner.

[0237] Accordingly, according to one embodiment, rather than the terminal performing (ICBM) beam measurement / reporting in a manner and target set by the network as before, if the terminal determines on its own that the quality of measurement beams corresponding to different PCI(s) is degraded or a beam change is required, the terminal can perform (ICBM) beam report, and / or the terminal can effectively determine a candidate for the measurement RS by selecting PCI(s) on its own for the (ICBM) beam report.

[0238] Accordingly, the terminal can proactively perform (ICBM) beam reports. When the terminal selects multiple PCIs / RS sets and performs beam reports for the corresponding beam qualities and IDs, the size of the beam report payload can (linearly) increase depending on the number of included PCI / RS sets. Therefore, we propose an encoding and sorting method of reporting quantities to effectively configure UE-initiated beam report contents during such operation.

[0239] For example, in relation to UE-initiated beam report, when a terminal selects and reports multiple PCI / RS sets during the corresponding operation, encoding and configuration methods for the corresponding reporting contents, and / or reconfiguration of indication fields according to the measurement RS selection method of (subsequent) terminals through indication of candidates of measurement RS associated with (serving / non-serving) PCIs are proposed.

[0240] According to the embodiments described below, when a terminal reports information on preferred / dispreferred PCI and related resource sets to the network, the network may turn off the corresponding measurement RS / cell. In this case, the terminal can reduce the reporting overhead by variably setting the size of the indication field indicating the RS ID for the beam quality value in the beam report. In addition, the proposed encoding and sorting method can solve the problem of the beam report payload size (linearly) increasing according to the number of included PCI / RS sets when performing a beam report by selecting multiple PCIs / RS sets of the terminal.

[0241] In the following, we consider a case where a terminal proactively selects (optimal) M PCI(s) / RS set(s) for measurement RSs associated with different PCI(s) for inter-cell BM / MTRP purposes and / or selects a corresponding resource set or resource configuration, and configures a report quantity of up to N (best) beam quality values ​​and their corresponding RS IDs for each PCI. In this case, the report quantity for multiple PCIs included in the report can be expressed as in the example in Table 7. For convenience, we would like to describe the proposals based on the example in Table 7. The number of PCIs and the number of beams per PCI in Table 7 are exemplary and may be varied.

[0242] In Table 7, it is assumed that three PCIs (PCI#1, PCI#2, PCI#3) are selected and four {beam quality, RS ID} pairs are reported for each PCI as report quantity.

[0243] PCI#1 (P1)PCI#2 (P2)PCI#3 (P3)1 st beam (B1){Q(P1, B1), ID(P1, B1)}{Q(P2, B1), ID(P2, B1)}{Q(P3, B1), ID(P3, B1)}2 nd beam (B2){Q(P1, B2), ID(P1, B2)}{Q(P2, B2), ID(P2, B2)}{Q(P3, B2), ID(P3, B2)}3 rd beam (B3){Q(P1, B3), ID(P1, B3)}{Q(P2, B3), ID(P2, B3)}{Q(P3, B3), ID(P3, B3)}4 th beam (B4){Q(P1, B4), ID(P1, B4)}{Q(P2, B4), ID(P2, B4)}{Q(P3, B4), ID(P3, B4)}

[0244] - {P1, P2, P3}: IDs corresponding to PCI - {B1, B2, B3, B4}: Beam IDs in order of the size of the beam quality value

[0245] - Q(Pi, Bj): The actual beam quality value representing the size of the j-th beam quality value within the i-th PCI.

[0246] - ID(Pi, Bj): RS ID corresponding to Q(Pi, Bj)

[0247] For example, in Table 7, the order of the quality values ​​of beams within the same PCI may be B1 > B2 > B3 > B4. However, if the PCIs are different, B1 of a specific PCI may have a lower quality value than B2 of another PCI.

[0248] In the example in Table 7, PCI can also be applied to be replaced with RS set.

[0249] Meanwhile, the table-based representation used in FIG. 7 (and FIGS. 8 to 10 described below) is merely a representation for easily explaining the proposed encoding method, and does not imply that the measurement values ​​(Q) and ID values ​​(ID) are arranged / positioned in a table structure in the Report reported by the actual terminal. The measurement values ​​(Q) and ID values ​​(ID) in the Report will be described in detail in Proposal 2.

[0250] Additionally, in the description below, the encoding method for specific information may refer to the method for determining the field value (or code point) to be set in the field providing the specific information. For example, a quality value called A and / or an ID value called B may be included in the measurement report as is, but A and / or B may be reported / indicated with a smaller number of bits depending on a specific encoding method agreed upon / set in advance between the terminal and the network.

[0251] Proposal 1

[0252] We propose an encoding method for beam quality values ​​and RS indication fields in beam reports containing PCI / RS sets.

[0253] [Beam quality value]

[0254] (1) Alt 1-1: Apply encoding method to absolute / differential values ​​of beam quality values ​​for each PCI / RS set.

[0255] Figure 8 is an example for explaining the encoding method of a beam report according to Alt 1-1.

[0256] For example, as a method of representing the beam quality value for each PCI / RS set, among the maximum N beams corresponding to each PCI, the value with the largest L1-RSRP (e.g., B1 in each PCI in the example of Fig. 8) is set as the absolute value, and an X-bit can be allocated to represent it. The remaining N-1 L1-RSRPs in each PCI are set as differential values, which are the differences from the absolute values, and a Y-bit can be allocated to represent them. X > Y.

[0257] In Fig. 8, at PCI# i (i is 1, 2 or 3), Q(Pi, B1) is expressed as an absolute value, and each of Q(Pi, B2), Q(Pi, B3) and Q(Pi, B4) can be expressed as a differential value with respect to Q(Pi, B1).

[0258] (2) Alt 1-2: Apply encoding method to the absolute / differential values ​​of beam quality values ​​of all reported PCIs / RS sets.

[0259] Figure 9 is an example of an encoding method of a beam report according to Alt 1-2.

[0260] The largest value among the (instantaneous and / or average) beam quality values ​​in all reported PCIs / RS sets is set as the absolute value, and an X-bit is allocated to represent this.

[0261] The beam quality values ​​of the remaining values ​​(i.e. [number of PCIs / RS sets reported] * [number of beams reported per PCI / RS set] - 1) are expressed as differential values ​​for the absolute values, and Y-bits can be allocated for this.

[0262] For example, referring to Figure 9, if B1 of PCI#2 has a higher (highest) quality than B1 of other PCIs, Q(P2, B1) is reported / encoded as an absolute value, but all the remaining quality values ​​can be encoded / reported as differential values ​​with respect to Q(P2, B1).

[0263] For example, a terminal can report to a base station which PCI a beam quality value determined as an absolute value belongs to.

[0264] (3) Alt 1-3: After encoding the values ​​of B1 for the beam quality values ​​of all PCIs / RS sets reported as in Alt 1-2 above (differential encoding between different PCIs in B1), B2-B4 corresponding to each PCI encodes the difference value for the value of B1 of each PCI (differential B2-B4 encoding based on B1 for each PCI)

[0265] for example,

[0266] - As in the example of Alt 1-2 above, since the beam quality value included in PCI#2 in B1 is the largest, set that value as the absolute value (X-bit).

[0267] - The quality values ​​corresponding to PCI#1 and PCI#3 of B1 are set as differential values ​​based on Q(P2,B1) (Y1-bit).

[0268] - The B2-B4 beam quality for each PCI is set as a differential value (Y2-bit) based on the encoded B1 value for each PCI. For example, for i=1, 3, 4, Q(Pi,B2), Q(Pi,B3), and Q(Pi,B4) can be encoded / reported as differential values ​​based on Q(Pi,B1) rather than Q(P2,B1).

[0269] - At this time, the Y1 and Y2 values ​​can be set / indicated to be the same or different.

[0270] For example, a terminal can report to a base station which PCI a beam quality value determined as an absolute value belongs to.

[0271] (4) Alt 1-4: Differential encoding for each Bi for the beam quality values ​​of all reported PCIs / RS sets

[0272] Figure 10 is an example of the encoding method of a beam report according to Alt 1-4.

[0273] The terminal can set the largest beam quality value in each Bi across multiple PCIs as an absolute value (X-bit) and set the beam quality values ​​corresponding to the remaining PCI(s) of the corresponding Bi as a differential value which is the difference between the absolute values ​​of the corresponding Bi (Y-bit).

[0274] Referring to FIG. 10, for the B1 measurement, it is assumed that among PCI#1, PCI#2, and PCI#3, PCI#2 has the highest measurement value; for the B2 measurement, it is assumed that among PCI#1, PCI#2, and PCI#3, PCI#1 has the highest measurement value; for the B3 measurement, it is assumed that among PCI#1, PCI#2, and PCI#3, PCI#2 has the highest measurement value; and for the B4 measurement, it is assumed that among PCI#1, PCI#2, and PCI#3, PCI#3 has the highest measurement value.

[0275] - In B1, the beam quality value Q(P2,B1) corresponding to PCI#2 is set as an absolute value, and the beam quality values ​​corresponding to PCI#1 and PCI#3 are each set as differential values ​​for Q(P2,B1).

[0276] - In B2, the beam quality value Q(P1,B2) corresponding to PCI#1 is set as an absolute value, and the beam quality values ​​corresponding to PCI#2 and PCI#3 are each set as a differential value for Q(P1,B2).

[0277] - In B3, the beam quality value Q(P2,B3) corresponding to PCI#2 is set as an absolute value, and the beam quality values ​​corresponding to PCI#1 and PCI#3 are each set as differential values ​​for Q(P2,B3).

[0278] - In B4, the beam quality value Q(P3,B4) corresponding to PCI#3 is set as an absolute value, and the beam quality values ​​corresponding to PCI#1 and PCI#2 are each set as differential values ​​for Q(P3,B4).

[0279] For example, a terminal can report to the base station which PCI each Bi beam quality value, determined as an absolute value, belongs to.

[0280] [RS instruction field (or information)]

[0281] If only some PCI(s) / RS set(s) from the whole are selected for measurement / reporting purposes, the codepoints corresponding to the unselected PCI(s) / RS set(s) may become unused surplus codepoints.

[0282] Therefore, the terminal may use the codepoint corresponding to the measurement RS subset(s) reduced by the PCI(s) / RS set(s) selection to indicate the RS ID (which RS it is measuring / reporting) in subsequent RS measurements / reports.

[0283] At this time, PCI / RS set selection for the RS subset configuration may be indicated / reported through a beam report of the terminal or the PCI / RS set may be indicated through signaling (i.e. MAC-CE and / or DCI) of the base station.

[0284] The encoding of report quantity in Proposal 1 can be broadly divided into a beam quality value and a corresponding RS indication field.

[0285] For example, for the beam quality value, as shown in Fig. 8, the beam quality value corresponding to B1 for each PCI can be configured as an absolute value of X (e.g. 7) bits, and the remaining values ​​corresponding to B2 to B4 can be configured as differential values ​​of Y (e.g. 4) bits based on the absolute value of B1.

[0286] Alternatively, as shown in Fig. 9, the largest value among all beam quality values ​​for PCIs reported / considered without distinguishing by PCI may be configured as an X-bit as an absolute value, and the remaining beam quality values ​​(i.e. [number of PCIs / RS sets reported] * [number of beams reported per PCI / RS set] - 1) may be configured as a Y-bit as the differential value. In this case, information about which PCI the absolute value corresponds to may be included as reporting information.

[0287] Alternatively, for the beam quality values ​​of all PCIs / RS sets being reported, after encoding the values ​​of B1 as in Alt 1-2 above (differential encoding from the perspective of B1), B2-B4 corresponding to each PCI can encode the difference value for the value of B1 of each PCI. (e.g., including a method of encoding differential B2-B4 based on differential B1).

[0288] Alternatively, a method may be used in which the largest beam quality value in each Bi is set as an absolute value (X-bit), as in Fig. 10, and the beam quality values ​​corresponding to the remaining PCI(s) of the corresponding Bi are set as differential values ​​which are the difference values ​​of the absolute values ​​of the corresponding Bi (Y-bit).

[0289] Alternatively, if sorting by beam quality value size from B1 to B4 for up to K beam information per PCI is not considered / supported, an indicator may be needed for which beam quality will be the absolute value for each PCI.

[0290] Alternatively, the beam quality of a specific position (e.g., the first) per PCI can be set as an absolute value in a predefined manner, and the remaining beam quality values ​​can be expressed as differential values. In this case, since the differential values ​​expressed against the absolute values ​​may need to be summed or added, a pointer to this may be required. Alternatively, the candidate(s) that add positive values ​​to the differential beam quality value table can be configured, and then the corresponding ID can be indicated.

[0291] Regarding encoding for RS indication field (e.g., CRI / SSBRI), the terminal may perform RS measurement and report using some PCI subset / RS set(s), and based on this, the base station may or may not transmit RSs corresponding to / not corresponding to the above information. Since the terminal and the base station can know RSs corresponding to / not corresponding to specific PCI(s) / RS set(s) based on the preset RS configuration and report configuration through the indicated PCI subset / RS set(s), the terminal may indicate RS ID using codepoints corresponding to RS subset(s) reduced by the PCI subset / RS set(s) selection operation, rather than configuring RS indication field (e.g., CRI / SSBRI) for all existing RSs for the purpose of indicating RS ID in subsequent RS measurement / reporting.

[0292] For example, if the number of measurement RSs configured by RRC is 4 (CRI bits = 2 and the corresponding RS IDs = RS#0, RS#1, RS#2, RS#3), and the network signaling indicates that measurement reports corresponding to RS#1 and RS#2 are not necessary, the number of RSs actually used for measurement is 2 (RS#0, RS#3). Therefore, the CRI bit for indicating 2 RSs can be changed when configuring the beam report content by applying 1 instead of the existing 2. In this case, if CRI = 0, it can correspond to RS#0, if CRI = 1, it can correspond to RS#3, and so on.

[0293] Alternatively, in the above example, the RS subset can be set in advance (e.g., set#0={RS#0, RS#1, RS#2, RS#3} / set#1={RS#0, RS#3} / set#2={RS#0, RS#1, RS#2}) and the candidate set of the measurement RS can be signaled by indicating the corresponding set index with MAC-CE and / or DCI.

[0294] Considering measurement reports that are reported on different physical channels in different reporting instances, rather than encoded within the same UCI, a mismatch issue with the selected RS subset(s) may occur between the base station and the UE if the base station has not received the information from the previous reporting instance. For example, if the UE has applied codepoints corresponding to the RS subset(s) in the current reporting instance, the base station may not be able to interpret them correctly. To address this issue, the UE may perform the above actions (e.g., update the RS subset(s) and reuse unused codepoints, etc.) by receiving a confirmation / ACK from the base station for the information reported in the most recent reporting instance.

[0295] Proposal 1-1

[0296] In the above proposal 1, we will look at an example of how to set / instruct PCI-specific X and Y values ​​when encoding report contents.

[0297] For example, a table can be set / indicated for sorting PCIs according to a specific criterion, and the number of bits to express the absolute / differential value for each PCI and / or the corresponding beam quality value.

[0298] Example 1) When there are three PCIs (i.e. PCI#1, PCI#2, PCI#3) as in the example of Proposal 1,

[0299] - Corresponding absolute bit number candidates {X#1 X#2, X#3} = {7, 6, 5}; and

[0300] - Corresponding differential bit number candidates {Y#1, Y#2, Y#3} = {5, 4, 4} can be predefined / set, and based on this, the absolute bit number and / or differential bit number can be determined / indicated.

[0301] Meanwhile, for settings having the same number of X bits and / or the same number of Y bits, the RSRP table for expressing the beam quality value can be set differently to configure the RSRP resolution differently for each table index.

[0302] Example 2) Beam quality value table corresponding to the number of differential bits in Example 1 above

[0303] {T#1, T#2, T#3} = {5-bit table, 4-bit table#1, 4-bit table #2}

[0304] - 4-bit table#1 is 1dB interval (e.g. 0, -1dB, -2dB…)

[0305] - 4-bit table#2 is 3dB interval (e.g. 0, -3dB, -6dB…)

[0306] Here, one or more of the following may be considered as examples of specific criteria:

[0307] - Comparison of beam quality values ​​(best and / or average) by PCI / RS set;

[0308] - (best and / or average) beam quality values ​​for each PCI / RS set corresponding to the threshold(s); and / or

[0309] - Number of times the PCI / RS set is selected in multiple instances

[0310] The X, Y values ​​and / or corresponding beam quality value table for each PCI may be predefined / fixed or may be information that the base station sets for the terminal. Alternatively, when considering two-part encoding, the terminal may determine the X, Y values ​​and / or corresponding beam quality value table (common or specific to the PCI(s) / RS set(s)) and report information about such terminal decision to the network as part 1 information.

[0311] Proposal 1-1 is a method of differentially setting / indicating the bit numbers X and Y applied when encoding beam quality values ​​for each PCI, as in Proposal 1, by using the relationship between absolute values ​​and differential values ​​and / or by PCI, rather than applying them equally as before, such as X=7, Y=4.

[0312] As a criterion for differentiating X and Y values ​​for each PCI, (i) the performance level of the beam quality value of the PCI, (ii) the average beam quality, and / or (iii) reliability in the time domain, such as whether the PCI is selected for the beam report even when measurements are performed at multiple time instances, can be considered.

[0313] Based on these criteria, if a specific PCI has priority, the absolute or differential value can be expressed in more detail than before, or the resolution of the table for expressing the (differential) beam quality value can be differentiated to utilize it for beam information for the PCI and beam indication based on it. In addition, even if the same number of bits is set / indicated, multiple beam quality value tables can be indicated, and the resolution can be set differently for each table, so that the difference from the actual value for the beam quality value information can be expressed by minimizing the difference according to the beam quality value characteristics in the PCI. For such settings / indications, the values ​​for {X, Y, table ID} can be fixed, or the base station can set the values ​​to the terminal. Alternatively, the terminal can indicate the corresponding value(s) at its own discretion and report them to the base station. For example, when considering two-part encoding, the above information can be reported as part 1 information.

[0314] Proposal 2

[0315] We will examine the method / order in which beam quality values ​​(encoded based on Proposal 1, for example) are arranged / included as report contents within a report. In the following Figures 11 to 14, which illustrate examples of Proposal 2, the direction of the arrows may indicate the order in which the corresponding information is arranged / sorted / included in the terminal's measurement report.

[0316] (1) Alt 2-1: Sequential sorting method for absolute / differential values ​​of beam quality values ​​by PCI / RS set

[0317] For example, report content can be composed by sorting encoded beam quality values ​​in order from B1 to B4 in each PCI / RS set.

[0318] Figure 11 is a drawing for explaining the alignment of report contents according to Alt 2-1.

[0319] Referring to Fig. 11, report contents can be configured by concatenating encoded L1-RSRP in the order of B1-B4 in each PCI / RS set.

[0320] In Fig. 11, for convenience of explanation, the order of B1-B4 in PCI#1 > B1-B4 in PCI#2 > B1-B4 in PCI#3 is assumed, but the order of PCI is not limited to this.

[0321] For example, the PCIs can be sorted in descending order of the quality value of B1 by comparing the sizes of each B1 in the PCI / RS sets. For example, if Q(P2, B1) > Q(P3, B1) > Q(P1,B1), the sorting order can be PCI#2→PCI#3→PCI#1.

[0322] (2) Alt 2-2: For encoding based on Alt 1-2, beam quality values ​​for PCI / RS sets with absolute values ​​can be sorted first.

[0323] At this time, as described in Alt 1-2, the terminal may be required to report information or index of the PCI / RS set corresponding to the absolute value.

[0324] Figure 12 is a drawing for explaining the alignment of report contents according to Alt 2-2.

[0325] Referring to Fig. 12, at this time, PCI#1 with absolute value Q(P1, B1) is arranged first. Within PCI#1, the order may be B1, B2, B3, and B4. The order of values ​​corresponding to the remaining PCI / RS sets that do not correspond to absolute values ​​may follow at least one of the following, but is not limited thereto.

[0326] (i) increasing / decreasing order according to PCI / RS set ID;

[0327] (ii) Apply circular rotation based on specific PCI;

[0328] (iii) Compare the size of B1 for each PCI / RS set and arrange the PCIs starting from the largest one.

[0329] (3) Alt 2-3: Sorts the PCIs under consideration in order of beam quality value.

[0330] In one embodiment, at least one of the beams (B1, B2, B3, B4) may be sorted by PCI rather than by beam quality value. For example, all quality values ​​may be sorted by PCI rather than by quality value. Alternatively, some may be sorted by PCI rather than by quality value, while others may be sorted by beam quality value.

[0331] Meanwhile, omissions may occur / require the reporting UCI payload. For example, due to constraints on the maximum reportable payload size, some quality values ​​may need to be omitted. In this case, the quality values ​​included / placed / ordered last may be omitted first.

[0332] As an example of a simple omission, one could sort the beam qualities (across all PCIs) in ascending order and omit B4→B3→B2 from the report content when omission is needed (e.g., omit from lowest beam quality value). However, this approach could result in all B1 to B4 of a specific PCI being omitted if that PCI has a poor quality. For example, if B1 of PCI#2 has a lower quality value than B4 of PCI#1, B4 of PCI#1 would be reported, but B1 to B4 of PCI#2 would be omitted entirely.

[0333] If PCIs #1, #2, and #3 are PCIs selected by the terminal, the network needs to anticipate and prepare for transmission and reception based on those PCIs. To this end, it may be desirable to receive at least some beam quality reports from the terminal for those PCIs. However, if B1 through B4 are omitted entirely for a specific PCI, this network operation may become unfeasible.

[0334] As an example to address this issue, a method for sorting measurement values, as shown in Fig. 13 or Fig. 14, is proposed. To achieve this, the probability that the overall beam quality value is good for a PCI with a large average beam quality value and / or absolute value for each PCI can be considered. Measurement values ​​arranged / sorted later in Fig. 13 / 14 can be omitted first.

[0335] Figure 13 is a drawing to explain an example of the alignment of report contents according to Alt 2-3.

[0336] Referring to Fig. 13, the quality value for B1 for each PCI is included first, and then B2, B3, and B4 for each PCI are sequentially included / sorted. In the example of Fig. 13, it is illustrated that PCI#1, PCI#2, and PCI#3 are included in the same Bi order, but this is not limited thereto. For example, each PCI may be arranged / sorted in the order of the highest average beam quality value of B1-B4 within the same Bi, or each PCI may be arranged / sorted in the order of the largest absolute value within the same Bi.

[0337] Figure 14 is a drawing to explain another example of alignment of report contents according to Alt 2-3.

[0338] Referring to Figure 14, B1 to B2 are sorted in the same manner as Figure 13. After B2, report content can be organized by sorting in order of B3 and B4 quality values ​​by PCI.

[0339] The example of Fig. 14 can be understood as following the alignment method of Fig. 13 for at least some beams including B1 corresponding to the Best beam, and applying the method of Fig. 11 or the method of Fig. 12 for the remaining beams.

[0340] For example, a terminal must report at least one (e.g., B1) quality for each preferred / selected PCI, and then across PCI, Bi, the quality values ​​can be sorted / included in descending order.

[0341] (4) Alt 2-4: When the encoding method is Alt 1-3, the best beam quality value in B1 can be sequentially sorted. Thereafter, the reporting quantities of B2-B4 can be concatenated according to the PCI order sorted based on the quality value in B1, or by applying circular rotation based on the increasing / decreasing order of the PCI or a specific PCI.

[0342] (5) Alt 2-5: When the encoding method is Alt 1-4, the best beam quality value for each Bi is sorted first, and the remaining PCI(s) in the corresponding Bi can be sorted in order of beam quality value, increasing / decreasing order of PCI index, or by applying circular rotation based on a specific PCI.

[0343] In this case, the PCI indicator can be included as reporting information about which PCI was used for encoding by Bi.

[0344] Alternatively, the remaining Bi can be concatenated in the same way based on the PCI ordering in B1.

[0345] For the above Alt 2-2, 2-3, and 2-4, information on PCI(s) that serve as the basis for sorting may be included as report content. In the case of two-part encoding, the information may be configured as part 1 information.

[0346] Proposal 2 discussed above can mean a UCI configuration method for UE-initiated beam report for inter-cell BM / MTRP, considering the beam quality value and corresponding RS ID of the PCI / RS set encoded in Proposal 1.

[0347] For example, as in Alt 2-1, the {beam quality value, RS ID} pairs can be arranged in order from B1 to B4 in each PCI / RS set based on the beam quality values ​​configured for each PCI. At this time, it can be arranged in increasing / decreasing order according to the PCI ID, but PCIs can also be arranged based on the 'specific criteria' in the above proposal 1-1, and concatenation can be performed based on this.

[0348] Alternatively, if the encoding method of the beam quality value is Alt-1-2, such as Alt 2-2, the {beam quality value, RS ID} pairs of the PCI containing the absolute value can be sorted first, and then the report quantity for the remaining PCI / RS set(s) can be sorted. In this case, it can also be based on the PCI ID, or the 'specific criteria' of the above proposal 1-1 can be applied to the remaining PCI.

[0349] Alternatively, rather than sorting by PCI, a method can be applied to sort the report quantity by utilizing the relationship between the order of beam quality values ​​(i.e. B1-B4), such as Alt 2-3. This has the advantage of preventing all or most of the information about a specific PCI from being omitted when considering omission due to a large UCI payload, and allowing subsequent beam indications that consider multiple beams for the considered PCIs / RS set(s). Alternatively, the above method can be followed for B1 and / or B2, which can be said to have relatively good beam quality, and sorting by PCI can be performed for (B2) B3 and B4. In this case, most of the information about a specific PCI is dropped, but it is possible to include a lot of beam information about a specific PCI with relatively good quality and a good average beam quality value, and utilize it for subsequent operations such as beam indications based on the corresponding priority.

[0350] For example, in the case of Alt 2-2, it includes information corresponding to the absolute value in two-part encoding and PCI information (i.e. PCI#2) corresponding to the absolute value, and as part 2 information, {beam quality, RS ID} pairs corresponding to B2-B4 of the remaining PCI#2 and {beam quality, RS ID} pairs of B1-B4 of each PCI can be concatenated in the order of PCI#1, PCI#3 in increasing order for the remaining PCIs. In this case, when CSI omission is performed, some information of part 2, i.e., B1-B4 information corresponding to PCI#3 will be dropped first depending on the degree of omission, and when additional omission is performed, information of B1-B4 corresponding to PCI#1 will be additionally dropped, and so on.

[0351] The above encoding method and sorting method can be determined and operated singly, or combined or used simultaneously. Furthermore, the operation can be performed according to a preset method, or the encoding / sorting method can be selected and indicated in a (separate) report from the terminal. Alternatively, the base station can indicate a specific encoding / sorting method to the terminal through signaling (i.e., MAC-CE and / or DCI).

[0352] FIG. 15 illustrates a flow of a method performed by a terminal according to one embodiment.

[0353] Referring to FIG. 15, the terminal can determine the terminal's preference / non-preference for multiple PCIs (physical cell IDs) (1505).

[0354] The terminal can measure M beams per PCI based on the terminal's preferred PCIs (1510).

[0355] The terminal may transmit a terminal-initiated beam measurement report for inter-cell beam management (ICBM) based on the measurement (1515). The terminal-initiated beam measurement report may be configured to include measurement values ​​of at least N beams among the M beams measured per PCI and reference signal identification information for the at least N beams.

[0356] The number of the above preferred PCIs is L, and at least some of the total L*M measurement values ​​may be omitted from the terminal-initiated beam measurement report.

[0357] Measurement values ​​of at least N beams per each PCI above may always be included in the terminal-initiated beam measurement report without being omitted.

[0358] The sorting order of the measurement values ​​of at least N beams per each PCI within the terminal-initiated beam measurement report may be determined based on the average or maximum value of the measurement values ​​of M beams per each PCI.

[0359] The above terminal-initiated beam measurement report can be constructed based on a plurality of {measurement value, reference signal identification information}-pairs.

[0360] The measurement values ​​included in at least one first {measurement value, reference signal identification information}-pair among the plurality of {measurement value, reference signal identification information}-pairs may be encoded as absolute values, and the measurement values ​​included in at least one second {measurement value, reference signal identification information}-pairs may be encoded as differential values ​​with respect to the absolute values.

[0361] The above measurement values ​​encoded as absolute values ​​may include the highest measurement value per PCI.

[0362] For each absolute value, an X-bit is allocated, and for each differential value, a Y-bit is allocated, where Y can be less than X.

[0363] The above terminal-initiated beam measurement report may include information indicating which PCI each absolute value is associated with.

[0364] The terminal can transmit information about the terminal's preference / non-preference determined for the plurality of PCIs.

[0365] FIG. 16 illustrates a flow of a method performed by a base station according to one embodiment.

[0366] Referring to FIG. 16, the base station can obtain information on the preference / non-preference of the terminal for multiple PCIs (physical cell IDs) (1605).

[0367] The base station can transmit M beams per PCI based on the preferred PCIs of the terminal (1610).

[0368] The base station may receive a terminal-initiated beam measurement report for inter-cell beam management (ICBM) from the terminal (1615). The terminal-initiated beam measurement report may include measurement values ​​of at least N beams among the M beams measured per PCI and reference signal identification information for the at least N beams.

[0369] The number of the above preferred PCIs is L, and at least some of the total L*M measurement values ​​may be omitted from the terminal-initiated beam measurement report.

[0370] Measurement values ​​of at least N beams per each PCI above may always be included in the terminal-initiated beam measurement report without being omitted.

[0371] The sorting order of the measurement values ​​of at least N beams per each PCI within the terminal-initiated beam measurement report may be determined based on the average or maximum value of the measurement values ​​of M beams per each PCI.

[0372] The above terminal-initiated beam measurement report can be constructed based on a plurality of {measurement value, reference signal identification information}-pairs.

[0373] The measurement values ​​included in at least one first {measurement value, reference signal identification information}-pair among the plurality of {measurement value, reference signal identification information}-pairs may be encoded as absolute values, and the measurement values ​​included in at least one second {measurement value, reference signal identification information}-pairs may be encoded as differential values ​​with respect to the absolute values.

[0374] The above measurement values ​​encoded as absolute values ​​may include the highest measurement value per PCI.

[0375] For each absolute value, an X-bit is allocated, and for each differential value, a Y-bit is allocated, where Y can be less than X.

[0376] The above terminal-initiated beam measurement report may include information indicating which PCI each absolute value is associated with.

[0377] Fig. 17 illustrates a communication system (1) applicable to the present disclosure.

[0378] Referring to FIG. 17, 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.

[0379] 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).

[0380] 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.

[0381] Figure 18 illustrates a wireless device applicable to the present disclosure.

[0382] Referring to FIG. 18, 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. 17.

[0383] 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.

[0384] 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.

[0385] 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.

[0386] 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.

[0387] 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.

[0388] 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.

[0389] Figure 19 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 17).

[0390] Referring to FIG. 19, the wireless device (100, 200) corresponds to the wireless device (100, 200) of FIG. 18 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. 18. For example, the transceiver(s) (114) may include one or more transceivers (106, 206) and / or one or more antennas (108, 208) of FIG. 18. 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).

[0391] 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. 17, 100a), a vehicle (Fig. 17, 100b-1, 100b-2), an XR device (Fig. 17, 100c), a portable device (Fig. 17, 100d), a home appliance (Fig. 17, 100e), an IoT device (Fig. 17, 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. 17, 400), a base station (Fig. 17, 200), a network node, etc. Wireless devices may be mobile or stationary depending on the use / service.

[0392] In FIG. 19, 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.

[0393] Figure 20 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.

[0394] Referring to FIG. 20, 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. 19, respectively.

[0395] 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.

[0396] 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.

[0397] 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.

[0398] 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.

[0399] 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, Determine preference / non-preference of the terminal for multiple PCI (physical cell IDs); Measuring M beams per PCI based on the preferred PCIs of the terminal; and Including transmitting a terminal-initiated beam measurement report for inter-cell beam management (ICBM) based on the above measurement, A method wherein the terminal-initiated beam measurement report is configured to include measurement values of at least N beams among the M beams measured for each PCI and reference signal identification information for the at least N beams.

2. In paragraph 1, The number of preferred PCIs above is L, At least some of the total L*M measurement values are omitted from the terminal-initiated beam measurement report, A method wherein the measurement values of at least N beams per each PCI are always included in the terminal-initiated beam measurement report without being omitted.

3. In paragraph 1, A method wherein the sorting order of the measurement values of at least N beams per each PCI within the terminal-initiated beam measurement report is determined based on the average or maximum value of the measurement values of M beams per each PCI.

4. In paragraph 1, A method wherein the terminal-initiated beam measurement report is constructed based on a plurality of {measurement value, reference signal identification information}-pairs.

5. In paragraph 4, A method wherein the measurement values included in at least one first {measurement value, reference signal identification information}-pair among the plurality of {measurement value, reference signal identification information}-pairs are encoded as absolute values, and the measurement values included in at least one second {measurement value, reference signal identification information}-pairs are encoded as differential values with respect to the absolute values.

6. In paragraph 5, A method wherein said measurement values encoded with said absolute values include the highest measurement value per PCI.

7. In paragraph 5, For each absolute value, an X-bit is allocated, for each differential value, a Y-bit is allocated, where Y is less than X.

8. In paragraph 5, A method wherein the terminal-initiated beam measurement report includes information indicating which PCI each absolute value is associated with.

9. In paragraph 1, A method further comprising transmitting information about the preference / non-preference of the terminal determined for the plurality of PCIs.

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, memory for storing commands; and A processor for performing operations by executing the above instructions, The operations of the above processor are: Determine preference / non-preference of the device for multiple PCI (physical cell IDs); Measure M beams per PCI based on the preferred PCIs of the device; and Including transmitting a device-initiated beam measurement report for inter-cell beam management (ICBM) based on the above measurements, A device wherein the above device-initiated beam measurement report is configured to include measurement values of at least N beams among the M beams measured per PCI and reference signal identification information for the at least N beams.

12. In paragraph 11, Further comprising a transceiver for transmitting or receiving a wireless signal under the control of the processor, 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, Obtain information about terminal preference / non-preference for multiple PCI (physical cell IDs); Transmitting M beams per PCI based on the preferred PCIs of the terminal; and Including receiving a terminal-initiated beam measurement report for ICBM (inter-cell beam management) from the terminal, A method wherein the terminal-initiated beam measurement report includes measurement values of at least N beams among the M beams measured for each PCI and reference signal identification information for the at least N beams.

15. At the base station, At least one memory for storing instructions; and At least one processor for performing operations by executing the above instructions, The operations of at least one processor, Obtain information about terminal preference / non-preference for multiple PCI (physical cell IDs); Transmitting M beams per PCI based on the preferred PCIs of the terminal; and Including receiving a terminal-initiated beam measurement report for ICBM (inter-cell beam management) from the terminal, A base station, wherein the terminal-initiated beam measurement report includes measurement values of at least N beams among the M beams measured for each PCI and reference signal identification information for the at least N beams.

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