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 may include: receiving configuration information for a beam measurement report through higher layer signaling; measuring multiple signals; and transmitting a terminal-initiated beam measurement report on the basis of at least one of one or more events configured through the configuration information being satisfied, wherein: the multiple signals are related to multiple active transmission configuration index (TCI) states of the terminal, respectively; and the terminal acquires a first measurement value on the basis of a signal having at least X-th highest quality among the multiple signals related to the multiple active TCI states, and determines that a first event among the one or more events has been satisfied on the basis of the quality of a specific beam being better than the acquired first measurement value by a first threshold value or more.

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 may include receiving configuration information for a beam measurement report via upper layer signaling; measuring a plurality of signals; and transmitting a terminal-initiated beam measurement report based on satisfaction of at least one of one or more events configured through the configuration information. Each of the plurality of signals may be related to a plurality of active transmission configuration index (TCI) states of the terminal. The terminal may obtain a first measurement value based on a signal having at least an Xth highest quality among the plurality of signals related to the plurality of active TCI states, and may determine that a first event of the one or more events is satisfied based on a quality of a specific beam being better than the obtained first measurement value by a first threshold or more.

[0008] The above plurality of active TCI states may be related to a plurality of current beams set in the terminal.

[0009] The above specific beam may be a new beam different from the current beams.

[0010] At least one of the above first threshold and the above X can be set through the above setting information.

[0011] The above plurality of signals may be reference signals for the plurality of active TCI states.

[0012] The above quality may be L1-RSRP (layer 1-reference signal received power).

[0013] The above one or more events may include a second event.

[0014] The second event may be satisfied based on the number of instances in which the quality of the new beam is judged to be better than the current beam of the terminal by a second threshold value or more within the time window exceeding M.

[0015] At least one of the above time window, the second threshold, and the M can be set through the above setting information.

[0016] The above one or more events may include a third event.

[0017] The third event may be satisfied based on the quality of the new beam being lower than the current beam of the terminal by a third threshold.

[0018] The above third threshold can be set through the above setting information.

[0019] 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.

[0020] According to another aspect of the present disclosure, a device includes a memory for storing commands; and a processor for performing operations by executing the commands, wherein the operations of the processor may include receiving configuration information for a beam measurement report through upper layer signaling; measuring a plurality of signals; and transmitting a device-initiated beam measurement report based on satisfaction of at least one of one or more events configured through the configuration information. Each of the plurality of signals may be associated with a plurality of active transmission configuration index (TCI) states of the device. The device may: obtain a first measurement value based on a signal having at least an Xth highest quality among the plurality of signals associated with the plurality of active TCI states, and determine that a first event of the one or more events is satisfied based on a quality of a specific beam being better than the obtained first measurement value by a first threshold or more.

[0021] The device may further include a transceiver for transmitting or receiving a wireless signal under the control of the processor.

[0022] The above device may be a terminal in a wireless communication system.

[0023] The above device may be a processing device configured to control a terminal in a wireless communication system.

[0024] According to another aspect of the present disclosure, a method performed by a base station may include transmitting configuration information for a beam measurement report to a terminal via upper layer signaling; transmitting a plurality of signals; and receiving a terminal-initiated beam measurement report from the terminal. One or more events for receiving the terminal-initiated beam measurement report may be configured in the terminal via the configuration information. Each of the plurality of signals may be associated with a plurality of active transmission configuration index (TCI) states of the terminal. The one or more events may include a first event satisfied based on a quality of a specific beam being better than a first measurement value at the terminal by a first threshold or more. The first measurement value for the first event may be obtained based on a signal having at least an Xth highest quality among the plurality of signals associated with the plurality of active TCI states.

[0025] According to another aspect of the present disclosure, a base station includes a memory for storing commands; and a processor for performing operations by executing the commands, wherein the operations of the processor may include transmitting configuration information for a beam measurement report to a terminal through upper layer signaling; transmitting a plurality of signals; and receiving a terminal-initiated beam measurement report from the terminal. One or more events for receiving the terminal-initiated beam measurement report may be configured in the terminal through the configuration information. Each of the plurality of signals may be related to a plurality of active transmission configuration index (TCI) states of the terminal. The one or more events may include a first event that is satisfied based on a quality of a specific beam being better than a first measurement value at the terminal by a first threshold or more. The first measurement value for the first event may be obtained based on a signal having at least an Xth highest quality among the plurality of signals related to the plurality of active TCI states.

[0026] According to the present disclosure, wireless signal transmission and reception can be efficiently performed in a wireless communication system. For example, beam measurement reporting is performed through a UE-initiated measurement report, thereby mitigating the overhead of the signal to be measured and the overhead of the terminal's measurement report, thereby improving power consumption efficiency.

[0027] Other technical effects can be inferred from the detailed description.

[0028] 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.

[0029] Figure 2 illustrates the structure of a radio frame.

[0030] Figure 3 illustrates a resource grid of slots.

[0031] Figure 4 illustrates an example of physical channels being mapped within a slot.

[0032] Figure 5 illustrates the PDSCH and ACK / NACK transmission process.

[0033] Figure 6 illustrates a PUSCH transmission process.

[0034] Figure 7 shows an example of a CSI-related procedure.

[0035] Figure 8 illustrates a beam measurement reporting process according to one embodiment.

[0036] FIG. 9 illustrates a flow of a method performed by a terminal according to one embodiment.

[0037] FIG. 10 illustrates a flow of a method performed by a base station according to one embodiment.

[0038] Figures 11 to 14 illustrate a communication system (1) and a wireless device applicable to the present disclosure.

[0039] The following technologies can be used in various wireless access systems, such as CDMA (code division multiple access), FDMA (frequency division multiple access), TDMA (time division multiple access), OFDMA (orthogonal frequency division multiple access), and SC-FDMA (single carrier frequency division multiple access). CDMA can be implemented with radio technologies such as UTRA (Universal Terrestrial Radio Access) or CDMA2000. TDMA can be implemented with radio technologies such as GSM (Global System for Mobile communications) / GPRS (General Packet Radio Service) / EDGE (Enhanced Data Rates for GSM Evolution). OFDMA can be implemented with radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, and E-UTRA (Evolved UTRA). UTRA is a part of UMTS (Universal Mobile Telecommunications System). 3GPP (3rd Generation Partnership Project) LTE (long term evolution) is part of E-UMTS (Evolved UMTS) that uses E-UTRA, and LTE-A (Advanced) is an evolved version of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolved version of 3GPP LTE / LTE-A.

[0040] As more and more communication devices demand greater communication capacity, the need for improved mobile broadband communications compared to existing RAT (Radio Access Technology) is emerging. Furthermore, massive MTC (Machine Type Communications), which connects multiple devices and objects to provide diverse services anytime, anywhere, is also a key issue to be considered in next-generation communications. Furthermore, communication system design that considers reliability and latency-sensitive services / terminals is being discussed. Accordingly, the introduction of next-generation RATs that consider enhanced Mobile BroadBand Communication (eMBB), massive MTC, and Ultra-Reliable and Low Latency Communication (URLLC) is being discussed. For convenience, this technology is referred to as NR (New Radio or New RAT) in the present invention.

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

[0042] In this specification, the expression "setting" can be replaced with the expression "configure / configuration", and the two can be used interchangeably. In addition, conditional expressions (e.g., "if", "in a case", or "when", etc.) can be replaced with the expression "based on that ~~" or "in a state / status". In addition, the operation of the terminal / base station or the SW / HW configuration according to the satisfaction of the condition can be inferred / understood. In addition, if the process of the receiving (or transmitting) side can be inferred / understood from the process of the transmitting (or receiving) side in signal transmission / reception between wireless communication devices (e.g., base stations, terminals), the description thereof can be omitted. For example, signal determination / generation / encoding / transmission, etc. of the transmitting side can be understood as signal monitoring reception / decoding / determination, etc. of the receiving side. In addition, the expression that the terminal performs (or does not perform) a specific operation can also be interpreted as meaning that the base station operates while expecting / assuming (or expecting / assuming that the terminal does not perform) the specific operation. In addition, the expression that the base station performs (or does not perform) a specific operation can also be interpreted as meaning that the terminal operates while expecting / assuming (or expecting / assuming that the base station does not perform) the specific operation. In addition, the division and index of each section, embodiment, example, option, method, plan, etc. in the following description are for the convenience of explanation and should not be interpreted as meaning that each constitutes an independent invention or that each must be implemented only individually. In addition, in describing each section, embodiment, example, option, method, plan, etc., if there is no explicitly conflicting / opposing description, it can be inferred / interpreted that at least some of them can be combined and implemented together, or at least some can be implemented with the omission of each.

[0043] In a wireless communication system, a terminal receives information from a base station via the downlink (DL) and transmits it to the base station via the uplink (UL). The information transmitted and received between the base station and the terminal includes data and various control information, and various physical channels exist depending on the type and purpose of the information being transmitted and received.

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

[0045] When a terminal is powered on again from a powered-off state or enters a new cell, it performs an initial cell search operation, such as synchronizing with the base station, in step S101. To this end, the terminal receives a Synchronization Signal Block (SSB) from the base station. The SSB includes a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Physical Broadcast Channel (PBCH). Based on the PSS / SSS, the terminal synchronizes with the base station and obtains information such as a cell ID (cell identity). In addition, the terminal can obtain broadcast information within the cell based on the PBCH. Meanwhile, the terminal can check the downlink channel status by receiving a Downlink Reference Signal (DL RS) during the initial cell search phase.

[0046] After completing the initial cell search, the terminal can obtain more specific system information by receiving a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) based on the physical downlink control channel information in step S102.

[0047] Thereafter, the terminal may perform a random access procedure such as steps S103 to S106 to complete connection to the base station. To this end, the terminal may transmit a preamble through a physical random access channel (PRACH) (S103) and receive a response message to the preamble through a physical downlink control channel and a corresponding physical downlink shared channel (S104). In the case of contention-based random access, a contention resolution procedure such as transmission of an additional physical random access channel (S105) and reception of a physical downlink control channel and a corresponding physical downlink shared channel (S106) may be performed.

[0048] The terminal that has performed the procedure as described above can then perform the general uplink / downlink signal transmission procedure, such as receiving a physical downlink control channel / physical downlink shared channel (S107) and transmitting a physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) (S108). The control information that the terminal transmits to the base station is collectively referred to as uplink control information (UCI). UCI includes HARQ ACK / NACK (Hybrid Automatic Repeat and request Acknowledgement / Negative-ACK), SR (Scheduling Request), CSI (Channel State Information), etc. CSI includes CQI (Channel Quality Indicator), PMI (Precoding Matrix Indicator), RI (Rank Indication), etc. UCI is generally transmitted through PUCCH, but can be transmitted through PUSCH when control information and traffic data must be transmitted simultaneously. Additionally, UCI can be transmitted aperiodically via PUSCH upon request / instruction from the network.

[0049] Figure 2 illustrates the structure of a radio frame. In NR, uplink and downlink transmissions are organized into frames. Each radio frame is 10 ms long and is divided into two 5 ms half-frames (HF). Each half-frame is divided into five 1 ms sub-frames (SF). A sub-frame is divided into one or more slots, and the number of slots within a sub-frame depends on the subcarrier spacing (SCS). Each slot contains 12 or 14 OFDM (Orthogonal Frequency Division Multiplexing) symbols, depending on the cyclic prefix (CP). When a normal CP is used, each slot contains 14 OFDM symbols. When an extended CP is used, each slot contains 12 OFDM symbols.

[0050] Table 1 illustrates that when CP is normally used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS.

[0051] SCS (15*2^u)N slot symb N frame,u slot N subframe,u slot 15KHz (u=0)1410130KHz (u=1)1420260KHz (u=2)14404120KHz (u=3)14808240KHz (u=4)1416016

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

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

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

[0055] Table 2 illustrates that when extended CP is used, the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary depending on the SCS.

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

[0057] The structure of the frame is only an example, and the number of subframes, number of slots, and number of symbols in the frame can be varied.

[0058] In an NR system, OFDM numerology (e.g., SCS) may be set differently between multiple cells that are merged into a single terminal. Accordingly, the (absolute time) interval of a time resource (e.g., SF, slot, or TTI) (conveniently referred to as TU (Time Unit)) consisting of the same number of symbols may be set differently between the merged cells. Here, the symbol may include an OFDM symbol (or CP-OFDM symbol), an SC-FDMA symbol (or Discrete Fourier Transform-spread-OFDM, DFT-s-OFDM symbol).

[0059] Figure 3 illustrates a resource grid of a slot. A slot contains multiple symbols in the time domain. For example, in the case of a regular CP, one slot contains 14 symbols, but in the case of an extended CP, one slot contains 12 symbols. A carrier contains multiple subcarriers in the frequency domain. A Resource Block (RB) is defined as multiple (e.g., 12) consecutive subcarriers in the frequency domain. A Bandwidth Part (BWP) is defined as multiple consecutive Physical RBs (PRBs) in the frequency domain and can correspond to a single numerology (e.g., SCS, CP length, etc.). A carrier can contain up to N (e.g., 5) BWPs. Data communication is performed through activated BWPs, and only one BWP can be activated for a single terminal. Each element in the resource grid is referred to as a Resource Element (RE), to which one complex symbol can be mapped.

[0060] Figure 4 illustrates an example of how physical channels are mapped within a slot. A PDCCH can be transmitted in the DL control region, and a PDSCH can be transmitted in the DL data region. A PUCCH can be transmitted in the UL control region, and a PUSCH can be transmitted in the UL data region. GP provides a time gap between the base station and the terminal when switching from transmission mode to reception mode or from reception mode to transmission mode. Some symbols within a subframe at the time of transition from DL to UL can be set as GP.

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

[0062] The PDCCH carries Downlink Control Information (DCI). For example, the PCCCH (i.e., DCI) carries the transmission format and resource allocation of the downlink shared channel (DL-SCH), resource allocation information for the uplink shared channel (UL-SCH), paging information for the paging channel (PCH), system information on the DL-SCH, resource allocation information for upper layer control messages such as random access responses transmitted on the PDSCH, transmission power control commands, activation / deactivation of Configured Scheduling (CS), etc. The DCI includes a cyclic redundancy check (CRC), which is masked / scrambled with various identifiers (e.g., Radio Network Temporary Identifier, RNTI) depending on the owner or usage of the PDCCH. For example, if the PDCCH is for a specific terminal, the CRC is masked with a terminal identifier (e.g., Cell-RNTI, C-RNTI). If the PDCCH is for paging, the CRC is masked with the Paging-RNTI (P-RNTI). If the PDCCH is for system information (e.g., a System Information Block, SIB), the CRC is masked with the System Information RNTI (SI-RNTI). If the PDCCH is for a random access response, the CRC is masked with the Random Access-RNTI (RA-RNTI).

[0063] The PDCCH consists of 1, 2, 4, 8, or 16 Control Channel Elements (CCEs) depending on the Aggregation Level (AL). A CCE is a logical allocation unit used to provide a PDCCH with a predetermined code rate depending on the radio channel status. A CCE consists of six Resource Element Groups (REGs). A REG is defined as one OFDM symbol and one (P)RB. The PDCCH is transmitted through a Control Resource Set (CORESET). A CORESET is defined as a set of REGs with a given numerology (e.g., SCS, CP length, etc.). Multiple CORESETs for a single UE can overlap in the time / frequency domain. A CORESET can be configured through system information (e.g., Master Information Block, MIB) or UE-specific upper layer (e.g., Radio Resource Control, RRC, layer) signaling. Specifically, the number of RBs and the number of OFDM symbols (up to 3) that constitute the CORESET can be set by upper layer signaling.

[0064] To receive / detect PDCCH, the UE monitors PDCCH candidates. PDCCH candidates represent the CCE(s) that the UE should monitor for PDCCH detection. Each PDCCH candidate is defined as 1, 2, 4, 8, or 16 CCEs depending on the AL. Monitoring involves (blind) decoding the PDCCH candidates. The set of PDCCH candidates that the UE monitors is defined as a PDCCH Search Space (SS). The search space includes a Common Search Space (CSS) or a UE-specific search space (USS). The UE can acquire DCI by monitoring PDCCH candidates in one or more search spaces configured by the MIB or higher-layer signaling. Each CORESET is associated with one or more search spaces, and each search space is associated with one COREST. The search space can be defined based on the following parameters.

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

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

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

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

[0069] * An opportunity (e.g., time / frequency resource) for monitoring PDCCH candidates is defined as a PDCCH (monitoring) opportunity. One or more PDCCH (monitoring) opportunities can be configured within a slot.

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

[0071] TypeSearch SpaceRNTIUse CaseType0-PDCCHCommonSI-RNTI on a primary cellSIB DecodingType0A-PDCCHCommonSI-RNTI on a primary cellSIB DecodingType1-PDCCHCommonRA-RNTI or TC-RNTI on a primary cellMsg2, Msg4 decoding in RACHType2-PDCCHCommonP-RNTI on a primary cellPaging DecodingType3-PDCCHCommonINT-RNTI, SFI-RNTI, TPC-PUSCH-RNTI, TPC-PUCCH-RNTI, TPC-SRS-RNTI, C-RNTI, MCS-C-RNTI, or CS-RNTI(s)UE SpecificUE SpecificC-RNTI, or MCS-C-RNTI, or CS-RNTI(s)User specific PDSCH decoding

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

[0073] DCI formatUsage0_0Scheduling of PUSCH in one cell0_1Scheduling of PUSCH in one cell1_0Scheduling of PDSCH in one cell1_1Scheduling of PDSCH in one cell2_0Notifying a group of UEs of the slot format2_1Notifying a group of UEs of the PRB(s) and OFDM symbol(s) where UE may assume no transmission is intended for the UE2_2Transmission of TPC commands for PUCCH and PUSCH2_3Transmission of a group of TPC commands for SRS transmissions by one or more UEs

[0074] DCI format 0_0 is used to schedule a TB-based (or TB-level) PUSCH, and DCI format 0_1 ​​can be used to schedule a TB-based (or TB-level) PUSCH or a CBG (Code Block Group)-based (or CBG-level) PUSCH. DCI format 1_0 is used to schedule a TB-based (or TB-level) PDSCH, and DCI format 1_1 can be used to schedule a TB-based (or TB-level) PDSCH or a CBG-based (or CBG-level) PDSCH (DL grant DCI). DCI format 0_0 / 0_1 may be referred to as UL grant DCI or UL scheduling information, and DCI format 1_0 / 1_1 may be referred to as DL grant DCI or DL ​​scheduling information. DCI format 2_0 is used to convey dynamic slot format information (e.g., dynamic SFI) to the terminal, and DCI format 2_1 is used to convey downlink pre-emption information to the terminal. DCI format 2_0 and / or DCI format 2_1 can be conveyed to the terminals within a group through the group common PDCCH, which is a PDCCH conveyed to the terminals defined as a group.

[0075] DCI format 0_0 and DCI format 1_0 may be referred to as fallback DCI formats, while DCI format 0_1 ​​and DCI format 1_1 may be referred to as non-fallback DCI formats. In the fallback DCI format, the DCI size / field configuration remains the same regardless of the terminal configuration. On the other hand, in the non-fallback DCI format, the DCI size / field configuration varies depending on the terminal configuration.

[0076] PDSCH carries downlink data (e.g., DL-SCH transport block, DL-SCH TB) and applies modulation methods such as Quadrature Phase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (QAM), 64 QAM, and 256 QAM. TB is encoded to generate a codeword. PDSCH can carry up to two codewords. Scrambling and modulation mapping are performed for each codeword, and modulation symbols generated from each codeword can be mapped to one or more layers. Each layer is mapped to resources along with a Demodulation Reference Signal (DMRS), generated as an OFDM symbol signal, and transmitted through the corresponding antenna port.

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

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

[0079] - HARQ(Hybrid Automatic Repeat reQuest)-ACK(Acknowledgement): This is a response to a downlink data packet (e.g., codeword) on the PDSCH. It indicates whether the downlink data packet was successfully received. One HARQ-ACK bit can be transmitted in response to a single codeword, and two HARQ-ACK bits can be transmitted in response to two codewords. The HARQ-ACK response includes a positive ACK (simply, ACK), a negative ACK (NACK), a DTX, or a NACK / DTX. Here, HARQ-ACK is used interchangeably with HARQ ACK / NACK and ACK / NACK.

[0080] - CSI (Channel State Information): Feedback information for the downlink channel. MIMO (Multiple Input Multiple Output)-related feedback information includes the Rank Indicator (RI) and Precoding Matrix Indicator (PMI).

[0081] Table 5 illustrates PUCCH formats. Depending on the PUCCH transmission length, they can be classified into Short PUCCH (formats 0 and 2) and Long PUCCH (formats 1, 3, and 4).

[0082] PUCCH formatLength in OFDM symbols N PUCCH symb Number of bitsUsageEtc01 - 2≤2HARQ, SRSequence selection14 - 14≤2HARQ, [SR]Sequence modulation21 - 2>2HARQ, CSI, [SR]CP-OFDM34 - 14>2HARQ, CSI, [SR]DFT-s-OFDM(no UE multiplexing)44 - 14>2HARQ, CSI, [SR]DFT-s-OFDM(Pre DFT OCC)

[0083] PUCCH format 0 carries UCI of up to 2 bits in size and is mapped and transmitted based on sequence. Specifically, the terminal transmits a specific UCI to the base station by transmitting one of multiple sequences through the PUCCH of PUCCH format 0. The terminal transmits the PUCCH of PUCCH format 0 within the PUCCH resources for the corresponding SR configuration only when transmitting a positive SR.

[0084] PUCCH format 1 carries UCI of up to 2 bits in size, and modulation symbols are spread in the time domain using an orthogonal cover code (OCC) (which is set differently depending on whether frequency hopping is used). DMRS are transmitted in symbols where modulation symbols are not transmitted (i.e., transmitted using Time Division Multiplexing (TDM).

[0085] PUCCH format 2 carries UCI with a bit size greater than 2 bits, and modulation symbols are transmitted by frequency division multiplexing (FDM) with DMRS. DM-RSs are located at symbol indices #1, #4, #7, and #10 within a given resource block with a density of 1 / 3. Pseudo Noise (PN) sequences are used for DM_RS sequences. Frequency hopping can be enabled for 2-symbol PUCCH format 2.

[0086] PUCCH format 3 does not multiplex terminals within the same physical resource blocks and carries UCI with a bit size greater than 2 bits. In other words, PUCCH resources in PUCCH format 3 do not include orthogonal cover codes. Modulation symbols are transmitted through time division multiplexing (TDM) with DMRS.

[0087] PUCCH format 4 supports multiplexing of up to four terminals within the same physical resource blocks and carries UCI with a bit size greater than 2 bits. In other words, PUCCH resources in PUCCH format 3 include orthogonal cover codes. Modulation symbols are transmitted through time division multiplexing (TDM) with DMRS.

[0088] At least one of one or more configured cells in a terminal may be configured for PUCCH transmission. At least the primary cell may be configured as a cell for PUCCH transmission. At least one PUCCH cell group may be configured in the terminal based on at least one cell configured for PUCCH transmission, and each PUCCH cell group includes one or more cells. The PUCCH cell group may be simply referred to as a PUCCH group. PUCCH transmission may be configured not only for the primary cell but also for the SCell, and the primary cell belongs to the primary PUCCH group, and the PUCCH-SCell configured for PUCCH transmission belongs to the secondary PUCCH group. For cells belonging to the primary PUCCH group, the PUCCH on the primary cell may be used, and for cells belonging to the secondary PUCCH group, the PUCCH on the PUCCH-SCell may be used.

[0089] PUSCH carries uplink data (e.g., UL-SCH transport block, UL-SCH TB) and / or uplink control information (UCI), and is transmitted based on a CP-OFDM (Cyclic Prefix - Orthogonal Frequency Division Multiplexing) waveform or a DFT-s-OFDM (Discrete Fourier Transform - spread - Orthogonal Frequency Division Multiplexing) waveform. When the PUSCH is transmitted based on a DFT-s-OFDM waveform, the UE transmits the PUSCH by applying transform precoding. For example, when transform precoding is disabled (e.g., transform precoding is disabled), the UE transmits the PUSCH based on the CP-OFDM waveform, and when transform precoding is enabled (e.g., transform precoding is enabled), the UE can transmit the PUSCH based on the CP-OFDM waveform or the DFT-s-OFDM waveform. PUSCH transmissions can be dynamically scheduled by UL grants in DCI, or semi-statically scheduled (configured grant) based on higher layer (e.g., RRC) signaling (and / or Layer 1 (L1) signaling (e.g., PDCCH)). PUSCH transmissions can be performed in a codebook-based or non-codebook-based manner.

[0090] Figure 5 illustrates an ACK / NACK transmission process. Referring to Figure 5, a terminal can detect a PDCCH in slot #n. Here, the PDCCH includes downlink scheduling information (e.g., DCI formats 1_0, 1_1), and the PDCCH indicates a DL assignment-to-PDSCH offset (K0) and a PDSCH-HARQ-ACK reporting offset (K1). For example, DCI formats 1_0, 1_1 can include the following information:

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

[0092] - Time domain resource assignment: K0 (e.g., slot offset), indicates the starting position of the PDSCH within slot #n+K0 (e.g., OFDM symbol index), and the length of the PDSCH (e.g., number of OFDM symbols).

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

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

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

[0096] Afterwards, the terminal receives PDSCH from slot #(n+K0) according to the scheduling information of slot #n, and when reception of PDSCH is finished in slot #n1 (where, n+K0≤n1), UCI can be transmitted through PUCCH in slot #(n1+K1). Here, UCI may include HARQ-ACK response for PDSCH. In Fig. 5, for convenience, it is assumed that SCS for PDSCH and SCS for PUCCH are the same and slot # n1 = slot #n+K0, but the present invention is not limited thereto. If the SCSs are different, K1 can be indicated / interpreted based on the SCS of PUCCH.

[0097] When the PDSCH is configured to transmit at most 1 TB, the HARQ-ACK response may consist of 1 bit. When the PDSCH is configured to transmit at most 2 TB, the HARQ-ACK response may consist of 2 bits if spatial bundling is not configured, and may consist of 1 bit if spatial bundling is configured. When the HARQ-ACK transmission timing for multiple PDSCHs is designated as slot #(n+K1), the UCI transmitted in slot #(n+K1) includes HARQ-ACK responses for multiple PDSCHs.

[0098] Whether a UE should perform spatial bundling for a HARQ-ACK response can be configured (e.g., via RRC / higher layer signaling) for each cell group. For example, spatial bundling can be individually configured for each HARQ-ACK response transmitted over the PUCCH and / or each HARQ-ACK response transmitted over the PUSCH.

[0099] Spatial bundling can be supported when the maximum number of TBs (or codewords) that can be received at a time (or scheduled via 1 DCI) in the serving cell is 2 (or more than 2) (e.g., when the upper layer parameter maxNrofCodeWordsScheduledByDCI corresponds to 2-TB). Meanwhile, more than 4 layers can be used for 2-TB transmission, and up to 4 layers can be used for 1-TB transmission. Consequently, when spatial bundling is configured for the cell group, spatial bundling can be performed for serving cells that can schedule more than 4 layers among the serving cells in the cell group. On the serving cell, a terminal that wishes to transmit a HARQ-ACK response via spatial bundling can generate the HARQ-ACK response by performing a (bit-wise) logical AND operation on the A / N bits for multiple TBs.

[0100] For example, assuming that a terminal receives a DCI scheduling 2 TB and receives 2 TB via PDSCH based on the DCI, the terminal performing spatial bundling can generate a single A / N bit by logically ANDing the first A / N bit for the first TB and the second A / N bit for the second TB. Consequently, if both the first TB and the second TB are ACK, the terminal reports the ACK bit value to the base station, and if either TB is NACK, the terminal reports the NACK bit value to the base station.

[0101] For example, if only 1-TB is actually scheduled on a serving cell configured to receive 2-TB, the terminal can generate a single A / N bit by logically ANDing the A / N bit for the 1-TB with bit value 1. Consequently, the terminal reports the A / N bit for the 1-TB to the base station as is.

[0102] A base station / terminal has multiple parallel DL HARQ processes for DL ​​transmission. These multiple parallel HARQ processes allow DL transmissions to be performed continuously while waiting for HARQ feedback regarding the successful or unsuccessful reception of a previous DL transmission. Each HARQ process is associated with a HARQ buffer in the MAC (Medium Access Control) layer. Each DL HARQ process manages state variables such as the number of transmissions of MAC Physical Data Blocks (PDUs) in the buffer, HARQ feedback for MAC PDUs in the buffer, and the current redundancy version. Each HARQ process is identified by a HARQ process ID.

[0103] Figure 6 illustrates a PUSCH transmission process. Referring to Figure 6, a terminal can detect a PDCCH in slot #n. Here, the PDCCH includes uplink scheduling information (e.g., DCI formats 0_0 and 0_1). DCI formats 0_0 and 0_1 can include the following information.

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

[0105] - Time domain resource assignment: Slot offset K2 indicates the starting position (e.g., symbol index) and length (e.g., number of OFDM symbols) of the PUSCH within the slot. The starting symbol and length can be indicated through SLIV (Start and Length Indicator Value) or can be indicated separately.

[0106] Thereafter, the terminal can transmit a PUSCH in slot #(n+K2) according to the scheduling information of slot #n. Here, the PUSCH includes a UL-SCH TB.

[0107] CSI-related actions

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

[0109] The terminal receives configuration information related to CSI from the base station via RRC signaling (710). The configuration information related to CSI may include at least one of CSI-IM (interference management) resource-related information, CSI measurement configuration-related information, CSI resource configuration-related information, CSI-RS resource-related information, or CSI report configuration-related information.

[0110] - CSI-IM resources can be configured for interference measurement (IM) of the terminal. In the time domain, the CSI-IM resource set can be configured periodically, semi-persistently, or aperiodicly. The CSI-IM resources can be configured as Zero Power (ZP)-CSI-RS for the terminal. The ZP-CSI-RS can be configured separately from the Non-Zero Power (NZP)-CSI-RS.

[0111] - The UE may assume that the CSI-RS resource(s) for channel measurement configured for one CSI reporting and the CSI-IM / NZP CSI-RS resource(s) for interference measurement (when NZP CSI-RS resource(s) are used for interference measurement) are in a QCL relationship with respect to 'QCL-TypeD' per resource.

[0112] - The CSI resource configuration may include at least one of a CSI-IM resource for interference measurement, an NZP CSI-RS resource for interference measurement, and an NZP CSI-RS resource for channel measurement. The CMR (channel measurement resource) may be an NZP CSI-RS for CSI acquisition, and the IMR (Interference measurement resource) may be an NZP CSI-RS for CSI-IM and IM.

[0113] - CSI-RS can be configured for one or more terminals. Different CSI-RS configurations may be provided for each terminal, or the same CSI-RS configuration may be provided to multiple terminals. CSI-RS can support up to 32 antenna ports. CSI-RS corresponding to N (N is 1 or greater) antenna ports can be mapped to N RE locations within a time-frequency unit corresponding to one slot and one RB. When N is 2 or greater, N-port CSI-RS can be multiplexed using CDM, FDM, and / or TDM schemes. CSI-RS can be mapped to REs other than REs to which CORESET, DMRS, and SSB are mapped. In the frequency domain, CSI-RS can be configured for the entire bandwidth, a portion of the bandwidth (BWP), or a portion of the bandwidth. CSI-RS may be transmitted in each RB within the bandwidth for which CSI-RS is configured (i.e., density = 1), or in every second RB (e.g., even or odd RB) (i.e., density = 1 / 2). When CSI-RS is used as a Tracking Reference Signal (TRS), a single-port CSI-RS may be mapped on three subcarriers in each resource block (i.e., density = 3). One or more CSI-RS resource sets may be configured for a UE in the time domain. Each CSI-RS resource set may include one or more CSI-RS configurations. Each CSI-RS resource set may be configured periodically, semi-persistently, or aperiodicly.

[0114] - The CSI report configuration may include configurations for feedback type, measurement resources, report type, etc. The NZP-CSI-RS resource set may be used for the CSI report configuration of the corresponding terminal. The NZP-CSI-RS resource set may be associated with CSI-RS or SSB. In addition, multiple periodic NZP-CSI-RS resource sets may be configured as TRS resource sets. (i) The feedback type may include a Channel Quality Indicator (CQI), a Precoding Matrix Indicator (PMI), a CSI-RS Resource Indicator (CRI), an SSB Resource block Indicator (SSBRI), a Layer Indicator (LI), a Rank Indicator (RI), a Layer 1-Reference Signal Received Strength (RSRP), etc. (ii) Measurement resources may include configurations for downlink signals and / or downlink resources on which the terminal performs measurements to determine feedback information. The measurement resources may be configured as ZP and / or NZP CSI-RS resource sets associated with CSI reporting configurations. The NZP CSI-RS resource set may include a CSI-RS set or an SSB set. For example, L1-RSRP may be measured for a CSI-RS set or an SSB set. (iii) Reporting types may include configurations for a time point at which the terminal performs reporting and an uplink channel, etc. The reporting time point may be configured as periodic, semi-persistent, or aperiodic. Periodic CSI reporting may be transmitted on PUCCH. Semi-persistent CSI reporting may be transmitted on PUCCH or PUSCH based on a MAC CE indicating activation / deactivation. Aperiodic CSI reporting may be indicated by DCI signaling.For example, the CSI request field of an uplink grant may indicate one of several report trigger sizes. Aperiodic CSI reports may be transmitted on the PUSCH.

[0115] The terminal measures CSI based on configuration information related to CSI. CSI measurement may include a procedure of receiving a CSI-RS (720) and computing the received CSI-RS to acquire CSI (730).

[0116] The UE can transmit a CSI report to the base station (740). For the CSI report, the time and frequency resources that the UE can use are controlled by the base station. The CSI (channel state information) can include at least one of a channel quality indicator (CQI), a precoding matrix indicator (PMI), a CSI-RS resource indicator (CRI), an SS / PBCH block resource indicator (SSBRI), a layer indicator (LI), a rank indicator (RI), L1-RSRP, and / or L-SINR.

[0117] The time domain behavior of CSI reporting supports periodic, semi-persistent, and aperiodic. i) Periodic CSI reporting is performed on short PUCCH and long PUCCH. The periodicity and slot offset of periodic CSI reporting can be configured by RRC, and refer to the CSI-ReportConfig IE. ii) SP (semi-periodic) CSI reporting is performed on short PUCCH, long PUCCH, or PUSCH. In case of SP CSI on short / long PUCCH, the periodicity and slot offset are configured by RRC, and CSI reporting is activated / deactivated by separate MAC CE / DCI. In case of SP CSI on PUSCH, the periodicity of SP CSI reporting is configured by RRC, but the slot offset is not configured by RRC, and SP CSI reporting is activated / deactivated by DCI (format 0_1). For SP CSI reporting on PUSCH, a separate RNTI (SP-CSI C-RNTI) is used. The initial CSI reporting timing follows the PUSCH time domain allocation value indicated in the DCI, and subsequent CSI reporting timings follow the cycle set by RRC. DCI format 0_1 ​​includes a CSI request field and can activate / deactivate a specific configured SP-CSI trigger state. SP CSI reporting has the same or similar activation / deactivation mechanism as the data transmission mechanism on the SPS PUSCH.iii) Aperiodic CSI reporting is performed on PUSCH and is triggered by DCI. In this case, information related to the triggering of aperiodic CSI reporting can be transmitted / indicated / configured via MAC-CE. For AP CSI with AP CSI-RS, the AP CSI-RS timing is configured by RRC, and the timing for AP CSI reporting is dynamically controlled by DCI.

[0118] Beam Management (BM)

[0119] 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.

[0120] - Beam measurement: An operation in which a base station or UE measures the characteristics of a received beam-forming signal.

[0121] - Beam determination: An operation in which a base station or UE selects its own transmit beam (Tx beam) / receive beam (Rx beam).

[0122] - 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.

[0123] - Beam report: An operation in which a UE reports information about a beam-formed signal based on beam measurement.

[0124] 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).

[0125] Additionally, each BM procedure may include Tx beam sweeping to determine the Tx beam and Rx beam sweeping to determine the Rx beam.

[0126] DL BM

[0127] 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.

[0128] Here, beam reporting may include preferred DL RS ID(identifier)(s) and corresponding L1-RSRP (Reference Signal Received Power).

[0129] The above DL RS ID may be an SSBRI (SSB Resource Indicator) or a CRI (CSI-RS Resource Indicator).

[0130] 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.

[0131] (1) SSB beam

[0132] 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.

[0133] 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.

[0134] (2) CSI-RS beam

[0135] 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.

[0136] 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)'.

[0137] 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'.

[0138] (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.

[0139] 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.

[0140] - 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'.

[0141] - 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.

[0142] - The terminal determines its own Rx beam.

[0143] - The terminal omits the CSI report. In this case, the reportQuantity of the CSI report config can be set to 'No report (or None)'.

[0144] That is, the terminal can omit the CSI report when repetition is set to 'ON'.

[0145] DL BM related beam indication

[0146] 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.

[0147] 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.

[0148] 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.

[0149] Rel-16 / 17 enhancement

[0150] 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.

[0151] 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.

[0152] - Joint DL / UL TCI Setting / Instruction Mode: The DL RS set / instructed by the Joint TCI state is applied not only as a QCL type-D source RS for DL ​​channels / RSs, but also as a spatial relation RS (and PL RS) for UL channels / RSs. That is, when the joint TCI state is instructed to update, the beam RS (and PL RS) for the corresponding DL channels / RSs and UL channels / RSs are changed together.

[0153] - 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.

[0154] 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.

[0155] 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.

[0156] QCL (quasi-co location)

[0157] 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.

[0158] 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.

[0159] 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:

[0160] - 'QCL-TypeA': {Doppler shift, Doppler spread, average delay, delay spread}

[0161] - 'QCL-TypeB': {Doppler shift, Doppler spread}

[0162] - 'QCL-TypeC': {Doppler shift, average delay}

[0163] - 'QCL-TypeD': {Spatial Rx parameter}

[0164] TCI states set through RRC signaling are deactivated by default.

[0165] 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.

[0166] 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.

[0167] M-TRP (multiple-transmission / reception point) related operations

[0168] 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.

[0169] 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.

[0170] 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 regarding the QCL RS / type (i.e., DL TCI state) used in the space / time / frequency resources for receiving the corresponding data / DCI.

[0171] 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.

[0172] 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).

[0173] 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.

[0174] 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.

[0175] 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.

[0176] First, we will look at the S-DCI-based M-TRP PDSCH transmission method.

[0177] 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.

[0178] 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).

[0179] Next, we will look at the M-DCI-based M-TRP PDSCH transmission method.

[0180] 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.

[0181] 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.

[0182] 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.

[0183] 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.

[0184] 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.

[0185] 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).

[0186] 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.

[0187] First, we will look at the S-DCI-based M-TRP PDCCH repetition transmission method.

[0188] 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.

[0189] 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.

[0190] Next, we will look at the M-TRP SFN PDCCH / PDSCH transmission method.

[0191] 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.

[0192] 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.

[0193] Next, we will look at the S-DCI-based M-TRP PUSCH repetitive transmission scheme.

[0194] 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.

[0195] Next, we examine a single PUCCH resource-based M-TRP PUCCH repetition transmission scheme.

[0196] 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.

[0197] 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.

[0198] TCI (transmission configuration indication) state / beam indication

[0199] 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.

[0200] 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.

[0201] 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.

[0202] 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.

[0203] 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)).

[0204] 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).

[0205] 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.

[0206] Single DCI based multi-TB PUSCH / PDSCH scheduling

[0207] 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.

[0208] STxMP (simultaneous transmission across multiple panels)

[0209] 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.

[0210] 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.

[0211] Multi-transmission reception point (MTRP) / multi-panel user equipment (MPUE) related UE-initiated beam / CSI report

[0212] For UE-initiated beam management / CSI reporting (MTRP / MP(multi-panel)UE related) beam / CSI reporting, the events and related actions required for the corresponding operation are proposed.

[0213] 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.

[0214] 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.

[0215] In NR Rel-17, a beam reporting method to support STxMP of Rel-18 as well as group-based beam reporting in MTRP environment and beam reporting considering multi panel (MP) of terminals was agreed upon as shown in Table 6 below.

[0216] Regarding beam measurements to support M-TRP simultaneous transmissions in Rel-17 group-based beam reporting, - Supports a single CSI report consisting of N beam pairs / groups and M (M>1) beams per pair / group, and allows simultaneous reception of different beams within a pair / group. - M=2, N=1 and N=2 are supported. Whether values ​​of N greater than 2 are supported and whether UE can report beams received on different RX beams is for further discussion.* The above may be applicable to L1-RSRP and whether it may be applicable to L1-SINR is for further discussion. For beam reporting option 2, - The following alternatives are considered for the maximum number of beam pairs / groups (N) that can be reported in a single CSI report: Alt1: Support maximum value of N = {1, 2} Alt2: Support maximum value of N = {1, 2, 3, 4} - In Rel.17, the maximum value of N can be a UE capability. - The value of N can be configured via RRC signaling. For channel measurement resource (CMR) resource configuration for beam reporting option 2, - Two sets or subsets of CMR resources are supported per periodic / semi-persistent CMR resource configuration. - Each beam pair CSI-report reported in a single CSI-report consists of M = 2 SSB-RI / CRI values, each An SSB-RI / CRI represents CMR resources from another CMR resource set or subset. The bit width of each SSBRI / CRI is determined by the number of SSB / CSI-RS resources in the associated CMR resource set. For beam measurement / reporting option 2, the maximum number of beam groups in a single CSI-report is a UE capability and can take values ​​from Nmax = {1,2,3,4} of Rel.17.For aperiodic reporting in Beam Measurement / Reporting Option 2, - When associated with an aperiodic resource configuration, the existing RRC parameter CSI-AssociatedReportConfigInfo may be extended to consist of two CMR resource sets, each configurable with its own QCL information. - When associated with a periodic / semi-persistent resource configuration, the resource configuration may consist of two CMR resource sets. Differential L1 RSRP reporting is supported in a UCI reduction manner for Beam Measurement / Reporting Option 2. Differential reporting for every beam group in the CSI report; - Including a 1-bit indicator of the CMR set associated with the highest RSRP value across all groups; - 1 bit indicating the CMR set with the higher RSRP value (e.g. 0 indicates the first SSBRI / CRI of the first CMR set, 1 indicates the first SSBRI / CRI of the second CMR set, etc.); UCI payload split = 7 / 4 bits for the 1st / 2nd SSBRI / CRI of the first beam group; 4 bits for all beams in different groups; To extend the existing RRC parameter CSI-AssociatedReportConfigInfo for the purpose of M-TRP beam reporting Option 2, a second 'resourcesForChannel' is introduced in CSI-AssociatedReportConfigInfo. For Option 2 with differential reporting, for each reported beam group other than the first beam group, the same SSBRI / CRI ordering as in the first beam group is assumed. "N CMR pairs" and "2 CMR groups" are configured in NZP-CSI-RS-ResourceSet. "sharedCMR" is configured in CSI-ReportConfig.Regarding how to differentiate between Rel-15 / 16 and Rel-17 group based beam reporting procedures, - Alt-1: Introduce RRC parameter groupBasedBeamReportingR17 Example: groupBasedBamReportingR17 Rel-18 enhancements for STxMP based transmission To enhance Rel-17 group based beam L1-RSRP reporting to support STxMP based transmission, the system may configure the UE to report either: - Alt1: Simultaneously apply UL Tx spatial filters determined from the reported CRI or SSBRI pairs for each reported CRI or SSBRI pair and simultaneously receive the reported CRI or SSBRI pairs. - Alt2: Simultaneously apply UL Tx spatial filters determined from the reported CRI or SSBRI pairs for each reported CRI or SSBRI pair. - Supporting Alt1 and / or Alt2 is a UE capability. For Rel-17 MPUE, the UE may report a list of UE capability values ​​[sets] for UE-initiated panel activation and selection. - Each UE capability value [set] consists of the maximum number of SRS ports supported. - Any two capability values ​​[sets] are different. - It can be discussed whether a UE capability value [set] can be common across all BWPs / CCs in the same band or BC. For Rel.17 enhancements that facilitate UE-initiated panel activation and selection, the UE may report one UE capability value [set] index for each CRI / SSBRI reported in one beam report.

[0217] Based on Table 6, the beam reporting method considering MTRP and MP in BM can be summarized as follows.

[0218] (1) DL MTRP group-based beam reporting

[0219] (a) Group-based beam reporting behavior for L1-RSRP is introduced in Rel-17 (via RRC configuration).

[0220] (b) A single CSI report consisting of N beam pairs, each pair containing M beams, and different beams within a pair can be received simultaneously.

[0221] i. N_max = {1,2,3,4} is the UE capability, M = 2

[0222] ii. CMR resource settings

[0223] - 2 CMR resource sets (per P / SP / AP CMR resource set)

[0224] - Each beam pair reported in a CSI report consists of M=2 CRI / SSBRI values, and each CRI / SSBRI indicates a CMR from a different set of CMR resources.

[0225] iii. Differential L1-RSRP reporting as a UCI reduction method

[0226] - Contains a 1-bit indicator of the CMR set associated with the largest RSRP across all groups.

[0227] (2) UL MTRP STxMP beam report

[0228] (a) As an improvement to Rel-17 group-based beam reporting, to support STxMP, it is possible to know whether the reported CRI / SSBRI pair is capable of simultaneous transmission and reception or simultaneous transmission based on UE capability.

[0229] (3) UL STRP MP beam report

[0230] (a) Define a UE capability value index (i.e. C-ID) to report how many C-IDs the UE has.

[0231] (b) C-ID can be included in the beam report and reported.

[0232] i. Report the CRI / SSBRI associated with the best N base station Tx beams and the corresponding C-ID along with the L1-RSRP or L1-SINR, which is the reception quality value of the corresponding RS.

[0233] This current beam measurement / reporting process requires frequent beam measurement / reporting to find the optimal beam in environments with significant terminal movement or significant movement of objects around the terminal, which presents problems of RS overhead, implementation burden due to terminal measurement / reporting, and increased power consumption.

[0234] In the Rel-19 standardization discussion, it was agreed to standardize the following to introduce a UE-initiated beam reporting operation in which a terminal performs a beam report when the terminal determines that the current beam quality is degraded or a beam change is needed, and a series of processes in which beam instructions are performed based on the UE-initiated beam report:

[0235] 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.

[0236] - UL signaling content for UE-initiated / event-based beam reporting for rapid beam switching

[0237] - UL signaling means / container considering the UE-initiated / event-driven characteristics of UE transmissions designed primarily for beam reporting purposes.

[0238] In this context, this specification defines the events that serve as the basis for UE-initiated BM (e.g., beam / CSI report). Currently, NR beam / CSI measurement / reporting is performed by the base station's configuration / instruction. Furthermore, we propose a method for the base station to trust and apply the quality of new beam(s) / CSI-RS(s) measured and judged by the UE based on the defined events.

[0239] Proposal 1

[0240] The terminal can perform a UE-initiated beam / CSI report when the following events occur.

[0241] Case 1) Based on simultaneous transmission / reception situation changes and / or C-ID changes

[0242] (1) Group based beam / CSI report:

[0243] (a) If the resource(s) within each CMR resource set are mapped to C-ID in an implicit / explicit manner, and the C-ID value for the current pair becomes different when a new beam is applied, the terminal can transmit a Group-based beam / CSI report.

[0244] For example, if the terminal reports that it receives C-ID#0 and C-ID#1 simultaneously, but only 2 beams must be received with a specific C-ID due to UE rotation, UE initiated beam reporting can be performed.

[0245] (b) Or, if group-based beam reporting is performed with simultaneous transmission / simultaneous reception / simultaneous transmission and reception set by RRC, but the status changes, the terminal can perform UE-initiated beam reporting.

[0246] i. For example, if the beam pair that most recently performed a report on a beam report capable of simultaneous reception or transmission is determined by the terminal to be unable to perform simultaneous reception or transmission at the current point in time, a UE-initiated beam report may be performed.

[0247] ii. For example, if a beam pair that most recently reported that simultaneous transmission and reception is possible is currently unable to perform one or more of simultaneous transmission or reception, a UE-initiated beam report may be performed.

[0248] In this case, the availability or unavailability of certain actions can be reported via indicators in the beam report. For example, since the beam report can indicate a situation triggered by the UE, it can also be used for subsequent beam indications.

[0249] (2) Perform beam reporting based on the MPE (Maximum Permissible Exposure) report.

[0250] Since the MPE report indicates that there are restrictions on the UL transmission utilization of the corresponding RS index or panel, the base station and the terminal can agree to include the terminal's preferred beam in the MPE report or perform beam reporting subsequent to the MPE report.

[0251] Case 2) Based on Current beam(s) / CSI(s) quality

[0252] (1) UE initiated beam reporting may be performed when the quality of the new beam / CSI(s) is higher than that of the current beam(s) / CSI(s), and / or when the quality of the current beam(s) / CSI(s) is lower than a threshold.

[0253] (a) When the number of current beams is multiple,

[0254] i. For beams / RS corresponding to activated TCI states,

[0255] A beam report can be performed if a specific [x] number of quality values ​​satisfies the above condition. [x] may mean [x] indicating higher quality. For example, a terminal may have multiple TCI states activated, and whether an event condition is met may be determined based on the quality of the top [x] quality values ​​among the quality measurements of RSs for the multiple active TCI states. For example, the terminal may calculate a first measurement result value based on a measurement for an RS for an active TCI state having at least the xth best quality, and may determine whether an event is met based on the calculated first measurement result value. The x value may be provided through higher layer signaling (e.g., configuration information for beam measurement reporting).

[0256] If the (average) quality values ​​of all or part of the beams corresponding to the activated TCI states satisfy the above conditions, beam reporting can be performed. For example, whether the event condition is satisfied can be determined based on all or part of the top [x] qualities. For example, whether the event condition is satisfied can be determined based on one of the top [x] qualities. More specifically, whether the event condition is satisfied can be determined based on the measurement result of the RS for the active TCI state with the lowest quality among the top [x] qualities (e.g., L1-RSRP). In other words, whether the event condition described below is satisfied can be determined based on the measurement of the RS for the active TCI state with the xth best quality among the quality measurements of the RSs for a plurality of active TCI states.

[0257] ii. For multi-TCIs or multiple serving beams, such as the Unified TCI framework for MTRP, the quality values ​​of each new beam corresponding to multiple TCIs can be compared to determine single or multiple event conditions, and an indicator can be included in the beam report indicating which TCI the event corresponds to. Subsequent beam indications / updates based on this indicator can be applied to the TCI(s) indicated by the indicator.

[0258] (b) For New beam / CSI quality(ies), either instantaneous values ​​(occasionally / some multiple new beam RSs) or average values ​​can be used.

[0259] (2) Here, the current beam may refer to the RS of the TCI state applied after the beam indication and beam application time (BAT) via MAC-CE and / or DCI. In addition, multiple current beams may refer to the RS of up to eight activated TCI states via MAC-CE and / or up to two indicated TCI states managed at the terminal in the unified TCI framework. In addition, new beam(s) may refer to the RS of the TCI state(s) set for channel measurement or beam management purposes.

[0260] Case 3) Based on the value for UE initiated 'dedicated' beam(s) / CSI-RS(s)

[0261] The base station sets the beam(s) / CSI-RS(s) that are the triggering target of the UE-initiated BM / CSI report, not the current beam / CSI-RS, and the terminal can report one of the beam(s) / CSI-RS(s) if the quality of the beam(s) / CSI-RS(s) exceeds the threshold (a method that does not indicate a connection with the current beam / CSI quality).

[0262] Proposal 1 proposes a condition where, as a starting point for performing UE-initiated BM / CSI reports, the UE performs a beam report to the base station on its own when a specific triggering condition is satisfied, rather than the base station configuring / instructing the UE to perform beam / CSI reports. Below, we examine more detailed examples for Cases 1), 2), and 3) of Proposal 1.

[0263] Case 1) is a method of linking group-based reporting (with STxMP) and MPUE's C-ID to an event, in which a beam / CSI report is performed when the C-ID corresponding to a new beam / CSI-RS and the shape of the beam / CSI-RS pair are different from the existing ones. If the presence or absence of simultaneous transmission and reception changes, or even if simultaneous transmission and reception is possible, but the panel(s) performing it changes (i.e., if the C-ID changes), a beam / CSI report is required to reflect this, and even if a C-ID is not assigned, the above operation method can be applied through a method such as resource grouping for the panel. The following can be considered as a specific embodiment of this. In this case, a report is performed again for the CSI report config that performed the latest report.

[0264] Rel-15 beam group report: If the beam group report is enabled, the terminal can report two different CRIs or SSBRIs (for each report setting) in the report instance, enabling simultaneous reception. In this case, if the beam pair that most recently reported is currently incapable of simultaneous reception, the terminal can perform a UE-initiated beam report.

[0265] There are two options for the Rel-17 NCJT (non-coherent joint transmission) CSI report:

[0266] - Option 1: The terminal is configured to report X(=0,1,2) CSIs associated with single-TRP measurement hypothesis and one CSI associated with NCJT measurement hypothesis. In this case, the quality value (e.g. CQI) of the CSI associated with the latest reported NCJT can be compared with the quality value (e.g. CQI) of the CSI that is the target of the event measurement, or the report can be triggered based on a threshold for the corresponding CSI quality value. And / or the event trigger condition can be determined based on the corresponding PMI. For example, in terms of CQI, even if the difference between the latest report CSI and the CSI that is the target of the event measurement is almost similar or similar, an event can be triggered to perform a CSI report if the PMI is different. At this time, information that the PMI has changed to a specific index and / or the amount of change in the CQI can be reported. In this case, including the corresponding {CQI, PMI} in the report content can follow a preset method, and the CQI can be a common CQI or a CQI specific to the corresponding CSI-RS. Alternatively, if the PMI changes but the CQI remains similar to a certain level, a report trigger may not be triggered.

[0267] - Option 2: The terminal can be configured to report one CSI associated with the best one among NCJT and a single-TRP measurement hypothesis. In this case, whether the corresponding quality value (e.g., CQI) is associated with the NCJT can be determined through the CRI, and this value can be used as the trigger method in Option 1. In this case, events can be configured by considering both CQI and / or PMI, as in Option 1.

[0268] Rel-18 CJT (coherent joint transmission) CSI report: For CJT purposes, given CSI-RSs are aggregated and the corresponding measurements are reported. Additionally, the combination of CSI-RSs to be included in CSI-RS aggregation can be signaled through RRC configuration. Therefore, the report can be triggered based on a threshold for the given CSI-RS aggregation value, or if the UE determines that the performance (e.g., CQI) of a specific CSI-RS combination has improved to a certain level compared to the latest report, this can be regarded as an event and a report can be performed. In this case, the corresponding combination information can be included in the report. In this case, considering the corresponding PMI and / or co-phase components, even if the performance is similar in terms of CQI, if there is a change in the PMI and / or co-phase components, it can be defined as an event to perform a CSI report.

[0269] Rel-17 C-ID MPUE report: Since it can report the CRI / SSBRI associated with the best N base station Tx beams and the corresponding C-ID along with the reception quality value of the corresponding RS, L1-RSRP or L1-SINR, the beam reporting can be triggered based on a comparison of the quality value in the most recently reported report with the quality value for the new beam and / or a change in the corresponding C-ID.

[0270] Rel-18 STxMP report: Since the group-based reporting with STxMP enables reporting of resource pairs capable of simultaneous reception / simultaneous transmission / simultaneous transmission / reception based on RRC, for example, if the beam pair that most recently reported a beam report capable of simultaneous reception or transmission is currently determined by the UE to be unable to perform simultaneous reception or simultaneous transmission, a UE-initiated beam report can be performed. Similarly, if the beam pair that most recently reported that simultaneous transmission and reception are possible is currently unable to perform one or more of simultaneous transmission or simultaneous reception, a UE-initiated beam report can be performed. In this case, an indicator can be reported during the beam report to indicate which operation is available or unavailable. For example, since the beam report can indicate a situation triggered by the UE, it can also be used for subsequent beam indications based on this.

[0271] Alternatively, it could work by including preferred beam reporting in addition to panel / RS information with MPE issues through the MPUE-related MPE (Maximum Permissible Exposure) report introduced in Rel-17, or by promising that beam reporting will be performed subsequent to the MPE report.

[0272] Case 2) refers to determining the beam / CSI report triggering condition by comparing the quality value of the new beam / CSI with the quality value of the current beam / CSI. For example, if the quality value of the current current beam / CSI is degraded compared to the newly measured beam / CSI quality value or the quality value of the new beam / CSI is better, a report can be performed including the beam quality value, which can be used for subsequent beam activation / indication. At this time, events can be configured by considering not only the current beam quality but also the activated beam(s). For example, event conditions can be configured based on the average quality value of multiple activated beams or the qualities of the top specific [x] beams.

[0273] Additionally, the new beam quality value may not be based on a single instantaneous value, but rather on multiple measurement counts and multiple measurement samples / instances. This will be described in more detail in Proposal 2. Meanwhile, the CSI report configuration or CMR (channel measurement resource) / IMR (interference measurement resource) set that becomes the UE-initiated beam / CSI report may be separately configured in advance for this purpose.

[0274] Case 3) is different from Case 2) in that it is not based on the current beam / CSI quality value, but rather sets up dedicated RS(s) for the purpose of event triggering of UE-initiated BM / CSI report and performs beam / CSI report when the quality value of the RS is above a certain level. For example, it has the advantage of not only simple STRP operation but also setting up a specific beam / CSI for each TRP as dedicated and allowing multiple TRPs to participate and operate according to this quality value, or vice versa.

[0275] In addition, as a specific example of the current beam / CSI of Case 2) and the dedicated beam / CSI of Case 3, (up to 2) indicated TCI state(s) based on the unified TCI framework of Rel-17 or Rel-18 can be considered. If the indicated TCI states are managed as 2 in the MTRP environment and the beam applicability of target channels / RSs based on them is applied, an MTRP specific reportConfig (associated with 2 CMR sets) can be set for UE initiated beam reporting. In this case, if a beam with a better quality than the indicated TCI state associated with the CMR set is measured in a specific CMR set, an STRP beam report is performed, and if beams with a better quality than 2 indicated TCI states are measured in 2 CMR sets, an MTRP beam report is performed, etc., thereby performing a beam reporting method based on the quality values ​​of the indicated TCI state(s) and the new beam(s).

[0276] In the above case, the occurrence of beam / CSI report triggering events due to instantaneous changes in L1 quality values ​​(e.g., L1-RSRP) may occur too frequently, increasing reporting overhead and potentially reducing the reliability of the report. Therefore, to address this issue and ensure the reliability of the report quantity, we propose Proposal 2, which can be implemented alongside Proposal 1.

[0277] Proposal 2

[0278] Proposal 2 is a method to increase the reliability of event-related beam / CSI reports. The options in Proposal 2 can be implemented individually, or at least two options can be implemented together.

[0279] (1) Option 1: Setting an Offset. The offset may be the same as or different from the threshold mentioned in Proposal 1 above. Additionally, different thresholds / offsets may be set for each beam / CSI-RS.

[0280] (2) Option 2: A method of judgment through measurements taken at multiple points in time or multiple measurement samples.

[0281] At this time, the base station can set a measurement window, and the terminal can perform a beam / CSI report if the above event occurs (consecutive) more than a certain number of times within the window.

[0282] At this time, the measurement window and specific number of times to judge each case of Proposal 1 can be set differently / individually.

[0283] (3) Option 3: A method of reporting confidence / accuracy values ​​for the corresponding contents together with the Beam / CSI report.

[0284] As an example, average beam / CSI quality information for a given measurement (how many times or for how long was the measurement, the corresponding C-ID report, etc.) could be reported.

[0285] In the case of multi-TCI in Case 2 / 3, an event may occur for one or all TCIs due to a comparison between the corresponding current beam and the new beam, and the event occurrence probability according to multi-TCI may be included in addition to the average beam quality. Similarly, when defining an event for simultaneous transmission / simultaneous reception / simultaneous transmission and reception in Case 1, the occurrence probability of the corresponding event for multiple samples / measurements may be included.

[0286] (4) Option 4: If the case of the above-defined proposal 1 is not performed alone, but multiple cases are met, the beam / CSI report is performed.

[0287] At this time, you can explicitly add to the report content which cases were considered and performed for beam reporting (report all cases or only a single case among multiple cases), or perform beam / CSI reporting when all specific events indicated through RRC settings are met.

[0288] Proposal 2, like Proposal 1, addresses the issue of frequent event triggers due to the large degree of beam quality value fluctuations caused by the instantaneous nature of L1 quality values ​​when performing events based on quality values ​​or specific conditions, resulting in the resulting overhead and reduced reliability of beam reporting. Below, we examine more detailed examples of each option in Proposal 2.

[0289] As in Option 1, in addition to defining a threshold for each event, it is necessary to separately set and operate an offset. For example, by additionally considering a threshold(offset), such as current (average) beam / CSI quality + threshold(offset), an event can be determined to have occurred if the value is lower than the new beam / CSI quality value. The threshold(offset) can be provided through higher-layer signaling (e.g., configuration information for beam measurement reports).

[0290] As a specific example of applying Option 1 of Proposal 2 to Case 2 of Proposal 1, an event may be set / defined based on the quality of a new beam (e.g., L1-RSRP (layer 1-reference signal received power)) being better than the RS of the active TCI state with the Xth highest quality among multiple active TCI states set in the terminal by more than a threshold(offset). The threshold(offset) and X may be provided via upper layer signaling (e.g., configuration information for beam measurement reporting).

[0291] Additionally, rather than the terminal performing a measurement report immediately upon satisfying the conditions for a triggering event, as in Option 2, the terminal may determine that the event has been satisfied and perform a report only if the same trigger condition is satisfied a specific number of times M (consecutive) during a specific duration (time window) based on the time at which the condition is satisfied. The specific duration (time window) and M can be provided through upper layer signaling (e.g., configuration information for beam measurement reporting).

[0292] As an example where Option 1 and Option 2 are implemented together, an event may be defined / set based on the number of instances where the quality of a new beam is judged to be better than the current beam of the terminal by a threshold (offset) within a specific time window exceeding M. At least one of the time window, the threshold (offset), and M may be set via higher layer signaling (e.g., configuration information for beam measurement reporting).

[0293] For Option 3, the reliability of the report can be improved by reporting the instantaneous or average difference in the quality values ​​of the new beam(s) / CSI(s) compared to the current beam / CSI. Alternatively, information on the confidence / accuracy of the dwell time interval of the new beam / CSI can also be included.

[0294] Option 4 means that rather than judging only a single case among the multiple cases defined as in Proposal 1 above, it considers multiple cases to determine whether an event is met. In this case, beam / CSI reporting can be performed only when all cases pre-defined through RRC are met, or an indicator indicating which case(s) are met and for which report to be performed can be added to the report content for each beam / CSI report. Alternatively, by assigning priorities to specific cases, beam reporting is not performed immediately even if a lower priority event is met until the event condition of a case with a higher priority is met, but a lower priority event can be triggered and performed if the high priority event is not met by a specific time window.

[0295] Figure 8 illustrates a beam measurement reporting process according to one embodiment.

[0296] Referring to FIG. 8, a terminal may receive at least one upper layer signaling (e.g., RRC signaling) from a network. The upper layer signaling may include configurations for various measurement reports of the terminal, and may include configurations for beam measurement reports, for example. The configurations for beam measurement reports may include information about TCI states for beam measurement reports, information about related reference signals, and / or information about one or more events for terminal-initiated beam measurement reports.

[0297] The one or more events may include, but are not limited to, at least one of a first event, a second event, and a third event.

[0298] The first event may be satisfied based on the quality of a specific beam being better than a first measurement value obtained by the terminal by a first threshold or more. The first measurement value may be obtained based on a signal having at least an Xth highest quality among the plurality of signals related to the plurality of active TCI states. At least one of the first threshold and the X may be set via higher layer signaling. The specific beam may be a new beam different from the current beams.

[0299] The second event may be satisfied based on the number of instances where the quality of the new beam is determined to be better than the current beam of the terminal by a second threshold within the time window exceeding M. At least one of the time window, the second threshold, and M may be set via higher layer signaling.

[0300] The third event may be satisfied based on the quality of the new beam being lower than the current beam of the terminal by a third threshold. The third threshold may be set using the configuration information.

[0301] The terminal can perform beam measurement based on a downlink reference signal (810) transmitted from the network (815).

[0302] Based on the beam measurement result that at least one event is satisfied, the terminal can report the beam measurement result to the network (820).

[0303] FIG. 9 illustrates a flow of a method performed by a terminal according to one embodiment.

[0304] Referring to FIG. 9, the terminal can receive configuration information for beam measurement report through upper layer signaling (905).

[0305] A terminal may measure a plurality of signals (910). Each of the plurality of signals may be associated with a plurality of active transmission configuration index (TCI) states of the terminal. The plurality of signals may be reference signals for the plurality of active TCI states. The plurality of active TCI states may be associated with a plurality of current beams set in the terminal.

[0306] The terminal may transmit a terminal-initiated beam measurement report based on satisfaction of at least one of one or more events set through the above configuration information (915).

[0307] The terminal may obtain a first measurement value based on a signal having at least the Xth highest quality among the plurality of signals related to the plurality of active TCI states, and may determine that a first event among the one or more events is satisfied based on a quality of a specific beam being better than the obtained first measurement value by a first threshold or more. At least one of the first threshold and the X may be set through the configuration information. The specific beam may be a new beam different from the current beams. The quality may be L1-RSRP (layer 1-reference signal received power).

[0308] The above one or more events may include a second event. The second event may be satisfied based on the number of instances in which the quality of the new beam is determined to be better than the current beam of the terminal by a second threshold within the time window exceeding M. At least one of the time window, the second threshold, and M may be set using the configuration information.

[0309] The above one or more events may include a third event. The third event may be satisfied based on the quality of the new beam being lower than the current beam of the terminal by a third threshold. The third threshold may be set using the configuration information.

[0310] FIG. 10 illustrates a flow of a method performed by a base station according to one embodiment.

[0311] Referring to FIG. 10, a base station can transmit configuration information for a beam measurement report to a terminal via upper layer signaling (1005). Through the configuration information, one or more events for receiving the terminal-initiated beam measurement report can be configured in the terminal.

[0312] A base station may transmit a plurality of signals (1010). Each of the plurality of signals may be associated with a plurality of active transmission configuration index (TCI) states of the terminal. The plurality of signals may be reference signals for the plurality of active TCI states. The plurality of active TCI states may be associated with a plurality of current beams configured for the terminal.

[0313] The base station can receive a terminal-initiated beam measurement report from the terminal.

[0314] The one or more events may include a first event that is satisfied based on a quality of a specific beam being better than a first measurement value at the terminal by a first threshold or more. The first measurement value for the first event may be obtained based on a signal having at least an Xth highest quality among the plurality of signals related to the plurality of active TCI states. At least one of the first threshold and the X may be set via the configuration information. The specific beam may be a new beam different from the current beams. The quality may be L1-RSRP (layer 1-reference signal received power).

[0315] The above one or more events may include a second event. The second event may be satisfied based on the number of instances in which the quality of the new beam is determined to be better than the current beam of the terminal by a second threshold within the time window exceeding M. At least one of the time window, the second threshold, and M may be set using the configuration information.

[0316] The above one or more events may include a third event. The third event may be satisfied based on the quality of the new beam being lower than the current beam of the terminal by a third threshold. The third threshold may be set using the configuration information.

[0317] Fig. 11 illustrates a communication system (1) applicable to the present disclosure.

[0318] Referring to FIG. 11, 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.

[0319] 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).

[0320] 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.

[0321] Figure 12 illustrates a wireless device applicable to the present disclosure.

[0322] Referring to FIG. 12, 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. 11.

[0323] 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.

[0324] 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.

[0325] 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.

[0326] 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.

[0327] 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.

[0328] 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.

[0329] Figure 13 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 11).

[0330] Referring to FIG. 13, the wireless device (100, 200) corresponds to the wireless device (100, 200) of FIG. 12 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. 12. For example, the transceiver(s) (114) may include one or more transceivers (106, 206) and / or one or more antennas (108, 208) of FIG. 12. 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).

[0331] 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. 11, 100a), a vehicle (Fig. 11, 100b-1, 100b-2), an XR device (Fig. 11, 100c), a portable device (Fig. 11, 100d), a home appliance (Fig. 11, 100e), an IoT device (Fig. 11, 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. 11, 400), a base station (Fig. 11, 200), a network node, etc. Wireless devices may be mobile or stationary depending on the use / service.

[0332] In FIG. 13, various elements, components, units / parts, and / or modules within the wireless device (100, 200) may be entirely interconnected via a wired interface, or at least some may be wirelessly connected via a communication unit (110). For example, within the wireless device (100, 200), the control unit (120) and the communication unit (110) may be wired, and the control unit (120) and a first unit (e.g., 130, 140) may be wirelessly connected via the communication unit (110). In addition, each element, component, unit / part, and / or module within the wireless device (100, 200) may further include one or more elements. For example, the control unit (120) may be composed of a set of one or more processors. For example, the control unit (120) may be composed of a set of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing processor, a memory control processor, etc. As another example, the memory unit (130) may be composed of RAM (Random Access Memory), DRAM (Dynamic RAM), ROM (Read Only Memory), flash memory, volatile memory, non-volatile memory, and / or a combination thereof.

[0333] Figure 14 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.

[0334] Referring to FIG. 14, 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. 13, respectively.

[0335] 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.

[0336] 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.

[0337] 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.

[0338] 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.

[0339] The present disclosure may be used in a terminal, base station, or other equipment of a wireless mobile communication system.

Claims

1. In a method performed by a terminal, Receive configuration information for beam measurement reports via upper layer signaling; measuring multiple signals; and Including transmitting a terminal-initiated beam measurement report based on at least one of one or more events set through the above configuration information being satisfied; Each of the above plurality of signals is related to a plurality of active TCI (transmission configuration index) states of the terminal, The above terminal: Obtaining a first measurement value based on a signal having at least Xth highest quality among the plurality of signals related to the plurality of active TCI states, A method for determining that a first event among the one or more events is satisfied based on the quality of a specific beam being better than a first threshold value or more than the first measurement value obtained above.

2. In paragraph 1, The above plurality of active TCI states are related to the plurality of current beams set in the terminal, A method wherein the specific beam is a new beam different from the current beams.

3. In paragraph 1, A method wherein at least one of the first threshold and X is set through the setting information.

4. In paragraph 1, A method wherein the plurality of said signals are reference signals for the plurality of active TCI states.

5. In paragraph 1, The above quality is L1-RSRP (layer 1-reference signal received power), method.

6. In paragraph 1, The above one or more events include a second event, A method wherein the second event is satisfied based on the number of instances in which the quality of a new beam is determined to be better than a current beam of the terminal by a second threshold value or more within a time window exceeds M.

7. In paragraph 6, A method wherein at least one of the time window, the second threshold and the M is set through the setting information.

8. In paragraph 1, The above one or more events include a third event, A method wherein the third event is satisfied based on the quality of the new beam being lower than a third threshold than the current beam of the terminal.

9. In paragraph 1, A method wherein the third threshold is set through the setting information.

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: Receive configuration information for beam measurement reports via upper layer signaling; measuring multiple signals; and Including transmitting a device-initiated beam measurement report based on at least one of one or more events set via the above configuration information being satisfied; Each of said plurality of signals relates to a plurality of active transmission configuration index (TCI) states of said device, The above device: Obtaining a first measurement value based on a signal having at least Xth highest quality among the plurality of signals related to the plurality of active TCI states, A device that determines that a first event among the one or more events is satisfied based on the quality of a specific beam being better than a first threshold value or more than the first measurement value acquired above.

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, Transmit configuration information for beam measurement reports to the terminal via upper layer signaling; Transmitting multiple signals; and Including receiving a terminal-initiated beam measurement report from said terminal, Through the above setting information, one or more events for receiving the terminal-initiated beam measurement report are set in the terminal, Each of the above plurality of signals is related to a plurality of active TCI (transmission configuration index) states of the terminal, The above one or more events include a first event satisfied based on the quality of a specific beam being better than a first threshold value or more than a first measurement value at the terminal, A method wherein the first measurement value for the first event is obtained based on a signal having at least an Xth highest quality among the plurality of signals related to the plurality of active TCI states.

15. At the base station, memory for storing commands; and A processor for performing operations by executing the above instructions, The operations of the above processor are: Transmit configuration information for beam measurement reports to the terminal via upper layer signaling; Transmitting multiple signals; and Including receiving a terminal-initiated beam measurement report from said terminal, Through the above setting information, one or more events for receiving the terminal-initiated beam measurement report are set in the terminal, Each of the above plurality of signals is related to a plurality of active TCI (transmission configuration index) states of the terminal, The above one or more events include a first event satisfied based on the quality of a specific beam being better than a first threshold value or more than a first measurement value at the terminal, A base station, wherein the first measurement value for the first event is obtained based on a signal having at least an Xth highest quality among the plurality of signals associated with the plurality of active TCI states.

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