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

Abstract

A terminal according to at least one of the embodiments disclosed in the present invention receives configuration information for a TCI via higher layer signaling, receives a DCI including one TCI field via a PDCCH signal, and obtains TCI status information for at least some of a plurality of signals based on the TCI field, the plurality of signals including a first set of signals including a first PDSCH signal and a second set of signals including a second PDSCH signal, and at least one of a plurality of code points for the TCI field is mapped to a combination of first TCI status information for the first set of signals including the first PDSCH signal and second TCI status information for the second set of signals including the second PDSCH signal.

Description

[Technical field]

[0001] The present invention relates to wireless communication systems, and more particularly to a method and apparatus for transmitting or receiving uplink / downlink radio signals in a wireless communication system. [Background technology]

[0002] Wireless communication systems have been widely deployed to provide various communication services such as voice and data. In general, wireless communication systems are multiple access systems capable of supporting communication with multiple users by sharing available system resources (bandwidth, transmission power, etc.). Examples of multiple access systems include code division multiple access (CDMA) systems, frequency division multiple access (FDMA) systems, time division multiple access (TDMA) systems, orthogonal frequency division multiple access (OFDMA) systems, single carrier frequency division multiple access (SC-FDMA) systems, etc. Summary of the Invention [Problem to be solved by the invention]

[0003] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a method and apparatus for efficiently performing a process of transmitting and receiving a radio signal.

[0004] The technical problem to be achieved in the present invention is not limited to the above technical problem, and other technical problems not mentioned will be clearly understood by a person having ordinary skill in the art to which the present invention pertains from the following description. [Means for solving the problem]

[0005] A method for a terminal (UE) receiving a signal in a wireless communication system according to an aspect of the present invention includes receiving configuration information for a transmission configuration indication (TCI) via higher layer signaling, and receiving downlink control information (DCI) including one TCI field via a physical downlink control channel (PDCCH) signal. The terminal obtains TCI state information for at least some of a plurality of signals based on the TCI field. The plurality of signals include a first set of signals including a first physical downlink shared channel (PDSCH) signal and a second set of signals including a second PDSCH signal. At least one of a plurality of codepoints for the TCI field is mapped to a combination of first TCI state information for the first set of signals including the first PDSCH signal and second TCI state information for the second set of signals including the second PDSCH signal.

[0006] As an example, the first TCI status information is first joint TCI status information in which a first DL TCI for a first downlink (DL) signal and a first UL TCI for a first uplink (UL) signal are joined among the signals of the first set, and the second TCI status information is second joint TCI status information in which a second DL TCI for a second DL signal and a second UL TCI for a second UL signal are joined among the signals of the second set.

[0007] As an example, the first TCI status information indicates at least one of a first DL TCI for a first downlink (DL) signal among the signals of the first set or a first UL TCI that is separate from the first DL TCI and is a UL TCI for a first uplink (UL) signal, and the second TCI status information indicates at least one of a second DL TCI for a second DL signal among the signals of the second set or a second UL TCI that is separate from the second DL TCI and is a UL TCI for a second UL signal.

[0008] The first set of signals includes at least one of a first PDCCH signal, a first channel state information-reference signal (CSI-RS), a first physical uplink shared channel (PUSCH) signal, a first physical uplink control channel (PUCCH) signal, and a first sounding reference signal (SRS) on a first control resource set (CORESET). The second set of signals includes at least one of a second PDCCH signal, a second CSI-RS, a second PUSCH signal, a second PUCCH signal, and a second SRS on a second CORESET.

[0009] First subset information for at least some of the signals in the first set to which the first TCI status information applies, and second subset information for at least some of the signals in the second set to which the second TCI status information applies are configured in the terminal via higher layer signaling.

[0010] First quasi-co location (QCL) information is applied in common to the first set of signals based on the first TCI status information, and second QCL information is applied in common to the second set of signals based on the second TCI status information.

[0011] The DCI has a DL-grant DCI format for downlink (DL) scheduling.

[0012] At least one code point mapped to a combination of the first TCI status information and the second TCI status information is associated with a multi-transmission reception point (TRP) operation.

[0013] The terminal transmits or receives at least one of the first set of signals based on the first TCI status information and the second set of signals based on the second TCI status information.

[0014] According to another aspect of the present invention, there is provided a processor-readable recording medium having a program recorded thereon for performing a signal receiving method.

[0015] According to yet another aspect of the present invention, there is provided a terminal for performing the above-mentioned signal receiving method.

[0016] According to yet another aspect of the present invention, there is provided an apparatus for controlling a terminal that performs the above-described signal receiving method.

[0017] According to another aspect of the present invention, a method for transmitting a signal by a base station in a wireless communication system includes transmitting configuration information for a transmission configuration indication (TCI) to a terminal (UE) via higher layer signaling, and transmitting downlink control information (DCI) including one TCI field to the terminal via a physical downlink control channel (PDCCH) signal. The base station indicates TCI state information for at least some of a plurality of signals to the terminal based on the TCI field. The plurality of signals include a first set of signals including a first physical downlink shared channel (PDSCH) signal and a second set of signals including a second PDSCH signal. At least one of a plurality of codepoints for the TCI field is mapped to a combination of first TCI state information for the first set of signals including the first PDSCH signal and second TCI state information for the second set of signals including the second PDSCH signal.

[0018] According to yet another aspect of the present invention, there is provided a base station for performing the above-described method for transmitting a signal. Effect of the Invention

[0019] According to the present invention, it is possible to efficiently transmit and receive radio signals in a radio communication system.

[0020] The effects obtained by the present invention are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those having ordinary skill in the art to which the present invention pertains from the following description. [Brief description of the drawings]

[0021] [Figure 1]1 is a diagram illustrating physical channels used in a 3GPP (registered trademark) system, which is an example of a wireless communication system, and a general signal transmission method using these channels. [Diagram 2] FIG. 1 illustrates a structure of a radio frame. [Diagram 3] FIG. 2 illustrates a resource grid of slots. [Figure 4] A diagram showing an example of mapping physical channels within a slot. [Diagram 5] A diagram illustrating a PDSCH and ACK / NACK transmission process. [Figure 6] FIG. 2 illustrates a PUSCH transmission process. [Figure 7] FIG. 1 is a diagram illustrating an example of a procedure related to CSI. [Figure 8] FIG. 1 is a diagram for explaining the concept of the Unified TCI framework. [Figure 9] FIG. 1 is a diagram for explaining the concept of an extended Unified TCI framework. [Figure 10] 1 illustrates an example of a method for a terminal to receive a signal (e.g., a PDCCH) in a wireless communication system according to an embodiment. [Figure 11] 1 illustrates an example of a method for a base station to transmit a signal (e.g., a PDCCH) in a wireless communication system according to an embodiment. [Figure 12] 1 is a diagram illustrating a communication system 1 and wireless devices applicable to the present invention. [Figure 13] 1 is a diagram illustrating a communication system 1 and wireless devices applicable to the present invention. [Figure 14] 1 is a diagram illustrating a communication system 1 and wireless devices applicable to the present invention. [Figure 15] 1 is a diagram illustrating a communication system 1 and wireless devices applicable to the present invention. [Figure 16] FIG. 2 is a diagram illustrating a DRX (Discontinuous Reception) operation applicable to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] The following technologies are used in various wireless access systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. CDMA can be implemented by radio technologies such as Universal Terrestrial Radio Access (UTRA) and CDMA2000. TDMA can be implemented by radio technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented by radio technologies such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA), etc. UTRA is part of the Universal Mobile Telecommunications System (UMTS). 3GPP (3rd Generation Partnership Project) LTE (long term evolution) is a 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.

[0023] As more communication devices require larger communication capacity, the need for improved mobile broadband (eMBB) communication compared to existing radio access technology (RAT) is emerging. In addition, large-scale MTC (massive machine type communications), which connects multiple devices and objects to provide various services anytime and anywhere, is one of the important issues to be considered in next-generation communications. In addition, system designs that take into account reliability and latency-sensitive services / terminals are being discussed. Thus, the introduction of next-generation RATs that take into account eMBB (enhanced mobile broadband communication), large-scale MTC, URLLC (ultra-reliable and low latency communication), etc. is being discussed, and in the present invention, the relevant technology is referred to as NR (New radio or New RAT) for convenience.

[0024] For clarity of explanation, 3GPP NR will be mainly described, but the technical idea of ​​the present invention is not limited thereto.

[0025] In this specification, the term "setting" may be replaced with the term "configure / configuration", and the two terms may be used interchangeably. Conditional expressions (e.g., "if", "in a case", or "when") may be replaced with expressions such as "based on that" or "in a state / status". The operation or SW / HW configuration of a terminal / base station due to the satisfaction of the relevant condition may be inferred / understood. In addition, in signal transmission / reception between wireless communication devices (e.g., base station, terminal), if the process of the receiving (or transmitting) side can be inferred / understood from the process of the transmitting (or receiving) side, the explanation may be omitted. For example, the signal determination / generation / encoding / transmission of the transmitting side can be understood as the signal monitoring reception / decoding / determination of the receiving side. In addition, an expression that a terminal performs (or does not perform) a specific operation may also be interpreted as the base station operating while expecting / assuming (or expecting / assuming not to perform) the specific operation of the terminal. The expression that the base station performs (or does not perform) a specific operation can also be interpreted as the terminal expecting / assuming (or expecting / assuming not to perform) the execution of a specific operation of the base station. In addition, in the following description, the divisions and indexes of each section, embodiment, example, option, method, solution, etc. are for convenience of explanation and should not be interpreted as meaning that each necessarily constitutes an independent invention or that each necessarily must be implemented individually. In addition, in describing each section, embodiment, example, option, method, solution, etc., unless there is an explicitly conflicting / opposing technology, it is inferred / interpreted that at least some of them may be combined and implemented together, or at least some may be omitted and implemented.

[0026] In a wireless communication system, a terminal receives information from a base station through a downlink (DL), and transmits information to the base station through an uplink (UL). 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 / purpose of the information transmitted and received.

[0027] FIG. 1 is a diagram illustrating physical channels used in a 3GPP NR system and a typical signal transmission method using these channels.

[0028] A terminal that has been turned on in a power-off state or that has newly entered a cell performs an initial cell search operation such as establishing synchronization with a 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). The terminal establishes synchronization with the base station based on the PSS / SSS and obtains information such as a cell identity (cell ID). The terminal also obtains broadcast information within the cell based on the PBCH. In addition, the terminal can receive a downlink reference signal (DL RS) during the initial cell search stage to check the state of the downlink channel.

[0029] After completing the initial cell search, the terminal receives a physical downlink control channel (PDCCH) and a physical downlink shared channel (PDSCH) based on information of the physical downlink control channel in step S102 to obtain more specific system information.

[0030] Thereafter, the terminal performs a random access procedure such as steps S103 to S106 to complete connection to the base station. To this end, the terminal transmits a preamble through a physical random access channel (PRACH) (S103) and receives 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, the terminal performs a contention resolution procedure such as transmitting a further physical random access channel (S105) and receiving a physical downlink control channel and a corresponding physical downlink shared channel (S106).

[0031] After performing this procedure, the terminal then receives a physical downlink control channel / physical downlink shared channel (S107) and transmits a physical uplink shared channel (Physical Uplink Shared Channel, PUSCH) / physical uplink control channel (Physical Uplink Control Channel, PUCCH) as a general uplink / downlink signal transmission procedure (S108). The control information transmitted by the terminal 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 via PUCCH, but is transmitted via PUSCH when control information and traffic data need to be transmitted simultaneously. In addition, UCI can be transmitted aperiodically via PUSCH upon request / instruction from the network.

[0032] FIG. 2 illustrates the structure of a radio frame. In NR, uplink and downlink transmissions are composed of frames. A radio frame has a length of 10 ms and is divided into two 5 ms half-frames (HF). A half-frame is divided into five 1 ms subframes (SF). A subframe is divided into one or more slots, and the number of slots in a subframe depends on the subcarrier spacing (SCS). Each slot contains 12 or 14 OFDM (Otrhogonal Frequency Division Multiplexing) symbols depending on the cyclic prefix (CP). If a normal CP is used, each slot contains 14 OFDM symbols. If an extended CP is used, each slot contains 12 symbols.

[0033] Table 1 illustrates that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe change depending on the SCS when a general CP is used.

[0034] [Table 1]

[0035] *N slot symb :Number of symbols in the slot

[0036] *N frame,u slot : Number of slots in the frame

[0037] *N subframe,u slot : Number of slots in a subframe

[0038] Table 2 illustrates that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary with the SCS when an extended CP is used.

[0039] [Table 2]

[0040] The frame structure is exemplary only, and the number of subframes, slots, and symbols within a frame can vary.

[0041] In the NR system, OFDM numerology (e.g., SCS) can be set to be different between multiple cells merged into one terminal. Accordingly, the (absolute time) duration of time resources (e.g., SF, slot, or TTI) (commonly referred to as TU (Time Unit) for convenience) consisting of the same number of symbols can be set to be different between the merged cells. Here, the symbols include OFDM symbols (or CP-OFDM symbols) and SC-FDMA symbols (or Discrete Fourier Transform-spread-OFDM, DFT-s-OFDM symbols).

[0042] FIG. 3 is a diagram illustrating a resource grid of a slot. A slot includes a number of symbols in the time domain. For example, in the case of a general CP, one slot includes 14 symbols, while in the case of an extended CP, one slot includes 12 symbols. A carrier includes a number of subcarriers in the frequency domain. A resource block (RB) is defined as a number of (e.g., 12) consecutive subcarriers in the frequency domain. A bandwidth part (BWP) is defined as a number of consecutive physical RBs (PRBs) in the frequency domain, and can correspond to one numerology (e.g., SCS, CP length, etc.). A carrier includes up to N (e.g., 5) BWPs. Data communication is performed in an activated BWP, and only one BWP is activated for one terminal. In the resource grid, each element is called a resource element (RE), and one complex symbol can be mapped to it.

[0043] Figure 4 is a diagram showing an example of mapping physical channels within a slot. PDCCH is transmitted in the DL control region, and PDSCH is transmitted in the DL data region. PUCCH is transmitted in the UL control region, and PUSCH is transmitted in the UL data region. GP provides a time gap when the base station and the terminal switch from a transmission mode to a reception mode or from a reception mode to a transmission mode. Some symbols at the time of switching from DL to UL within a subframe can be set as GP.

[0044] Each physical channel is described in more detail below.

[0045] The PDCCH carries Downlink Control Information (DCI). For example, the PDCCH (i.e., DCI) carries the transmission format and resource allocation of the DL-SCH (downlink shared channel), resource allocation information for the UL-SCH (uplink shared channel), paging information for the PCH (paging channel), system information on the DL-SCH, resource allocation information for higher layer control messages such as an voluntary access response transmitted on the PDSCH, a transmission power control command, activation / deactivation of configured scheduling (CS), etc. The DCI includes a cyclic redundancy check (CRC), and the CRC is masked / scrambled with various identifiers (e.g., Radio Network Temporary Identifier, RNTI) depending on the owner or use 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 a P-RNTI (Paging-RNTI). If the PDCCH is for system information (e.g., System Information Block, SIB), the CRC is masked with a System Information RNTI (SI-RNTI). If the PDCCH is for an unsolicited access response, the CRC is masked with a Random Access-RNTI (RA-RNTI).

[0046] The PDCCH is composed of 1, 2, 4, 8, or 16 CCEs (Control Channel Elements) depending on the AL (Aggregation Level). A CCE is a logical allocation unit used to provide a PDCCH with a predetermined code rate according to the radio channel condition. A CCE is composed of 6 REGs (Resource Element Groups). A REG is defined by one OFDM symbol and one (P)RB. The PDCCH is transmitted by a CORESET (Control Resource Set). A CORESET is defined by a set of REGs having a given neurology (e.g., SCS, CP length, etc.). Multiple CORESETs for one UE can be overlapped in the time / frequency domain. A CORESET is set by system information (e.g., Master Information Block, MIB) or UE-specific higher layer (e.g., Radio Resource Control, RRC, layer) signaling. Specifically, the number of RBs and the number of OFDM symbols (maximum 3) constituting a CORESET are set by higher layer signaling.

[0047] For PDCCH reception / detection, the terminal monitors PDCCH candidates. PDCCH candidates indicate the CCEs that the terminal monitors for PDCCH detection. Each PDCCH candidate is defined by 1, 2, 4, 8, or 16 CCEs depending on the AL. Monitoring includes (blind) decoding the PDCCH candidates. The set of PDCCH candidates that the terminal 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 terminal can obtain DCI by monitoring PDCCH candidates in one or more search spaces configured by 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 is defined based on the following parameters:

[0048] - controlResourceSetId: Indicates the CORESET associated with the search space.

[0049] - monitoringSlotPeriodicityAndOffset: indicates the PDCCH monitoring period (in slots) and the PDCCH monitoring period offset (in slots).

[0050] - monitoringSymbolsWithinSlot: indicates the PDCCH monitoring symbols within the slot (e.g. indicates the first symbol of CORESET).

[0051] - nrofCandidates: indicates the number of PDCCH candidates (one of 0, 1, 2, 3, 4, 5, 6, 8) for AL={1, 2, 4, 8, 16}.

[0052] *An opportunity (e.g., time / frequency resource) for monitoring a PDCCH candidate is defined as a PDCCH (monitoring) opportunity. One or more PDCCH (monitoring) opportunities are configured within a slot.

[0053] Table 3 illustrates the characteristics of each search space type.

[0054] [Table 3]

[0055] Table 4 illustrates an example of a DCI format transmitted via the PDCCH.

[0056] [Table 4]

[0057] DCI format 0_0 is used to schedule TB-based (or TB-level) PUSCH, and DCI format 0_1 ​​is used to schedule TB-based (or TB-level) PUSCH or CBG (Code Block Group)-based (or CBG-level) PUSCH. DCI format 1_0 is used to schedule TB-based (or TB-level) PDSCH, and DCI format 1_1 is used to schedule TB-based (or TB-level) PDSCH or CBG-based (or CBG-level) PDSCH (DL grant DCI). DCI format 0_0 / 0_1 is called UL grant DCI or UL scheduling information, and DCI format 1_0 / 1_1 is called DL grant DCI or DL ​​scheduling information. DCI format 2_0 is used to deliver dynamic slot format information (e.g., dynamic SFI) to the terminal, and DCI format 2_1 is used to deliver downlink pre-Emption information to the terminal. DCI format 2_0 and / or DCI format 2_1 are transmitted to terminals in a corresponding group via a group common PDCCH, which is a PDCCH transmitted to terminals defined in one group.

[0058] DCI format 0_0 and DCI format 1_0 are called fallback DCI formats, and DCI format 0_1 ​​and DCI format 1_1 are called non-fallback DCI formats. The fallback DCI format maintains the same DCI size / field configuration regardless of the terminal settings. On the other hand, the non-fallback DCI format has a different DCI size / field configuration depending on the terminal settings.

[0059] PDSCH carries downlink data (e.g. DL-SCH transport block, DL-SCH TB) and uses modulation methods such as QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), 64QAM, and 256QAM. The TB is encoded to generate a codeword. PDSCH carries up to two codewords. Scrambling and modulation mapping are performed for each codeword, and the modulation symbols generated from each codeword are mapped to one or more layers. Each layer is mapped to resources together with DMRS (Demodulation Reference Signal) to generate an OFDM symbol signal, which is then transmitted by the corresponding antenna port.

[0060] The PUCCH carries Uplink Control Information (UCI), which includes:

[0061] - SR (Scheduling Request): Information used to request UL-SCH resources.

[0062] - HARQ (Hybrid Automatic Repeat reQuest)-ACK (Acknowledgement): A response to a downlink data packet (e.g., a codeword) on a PDSCH. It indicates whether the downlink data packet is successfully received. One HARQ-ACK bit is transmitted as a response to a single codeword, and two HARQ-ACK bits are transmitted as a response to two codewords. HARQ-ACK responses include positive ACK (simply ACK), negative ACK (NACK), DTX (Discontinuous Transmission), or NACK / DTX. Here, the term HARQ-ACK is used interchangeably with HARQ ACK / NACK and ACK / NACK.

[0063] Channel State Information (CSI): Feedback information for a downlink channel. Multiple Input Multiple Output (MIMO)-related feedback information includes a Rank Indicator (RI) and a Precoding Matrix Indicator (PMI).

[0064] Table 5 shows an example of a PUCCH format. According to the PUCCH transmission length, it can be divided into Short PUCCH (formats 0 and 2) and Long PUCCH (formats 1, 3 and 4).

[0065] [Table 5]

[0066] PUCCH format 0 carries UCI with a maximum size of 2 bits and is mapped and transmitted based on a sequence. Specifically, the terminal transmits one of a plurality of sequences via a PUCCH with PUCCH format 0 to transmit a specific UCI to the base station. The terminal transmits a PUCCH with PUCCH format 0 within a PUCCH resource for a corresponding SR setting only when transmitting a positive SR.

[0067] PUCCH format 1 carries UCI with a maximum size of 2 bits, and the modulation symbols are spread in the time domain by an orthogonal cover code (OCC) (the setting of which varies depending on whether frequency hopping is used or not). DMRS is transmitted in symbols where no modulation symbols are transmitted (i.e., it is transmitted using TDM (Time Division Multiplexing)).

[0068] PUCCH format 2 carries UCI with a bit size larger than 2 bits, and modulation symbols are transmitted after frequency division multiplexing (FDM) with DMRS. DM-RS is located at symbol indexes #1, #4, #7, and #10 in a 1 / 3 density resource block. A Pseudo Noise (PN) sequence is used for the DM_RS sequence. Frequency hopping can be activated for the 2-symbol PUCCH format 2.

[0069] In PUCCH format 3, terminal multiplexing is not performed within the same physical resource block, and UCI with a bit size larger than 2 bits is carried. That is, the PUCCH resource of PUCCH format 3 does not include an orthogonal cover code. The modulation symbol is transmitted after being subjected to TDM (Time Division Multiplexing) with DMRS.

[0070] PUCCH format 4 supports multiplexing of up to four terminals in the same physical resource block and carries UCI with a bit size larger than 2 bits. That is, the PUCCH resource of PUCCH format 3 includes an orthogonal cover code. Modulation symbols are transmitted after being time division multiplexed (TDM) with DMRS.

[0071] At least one of the one or more configured cells in the terminal is configured for PUCCH transmission. At least the Primary Cell is configured as a cell for PUCCH transmission. At least one PUCCH cell group is configured in the terminal based on the at least one cell configured for PUCCH transmission, and each PUCCH cell group includes one or more cells. The PUCCH cell group is also simply called a PUCCH group. PUCCH transmission is configured not only for the Primary Cell but also for the SCell, the Primary Cell belongs to the Primary PUCCH group, and the PUCCH-SCell configured for PUCCH transmission belongs to the Secondary PUCCH group. The PUCCH on the Primary Cell is used for the Cell belonging to the Primary PUCCH group, and the PUCCH on the PUCCH-SCell is used for the Cell belonging to the Secondary PUCCH group.

[0072] The 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 Cyclic Prefix-Orthogonal Frequency Division Multiplexing (CP-OFDM) waveform or a Discrete Fourier Transform-spread-Orthogonal Frequency Division Multiplexing (DFT-s-OFDM) waveform. When the PUSCH is transmitted based on the DFT-s-OFDM waveform, the terminal applies transform precoding to transmit the PUSCH. As an example, when transform precoding is not possible (e.g., transform precoding is disabled), the terminal transmits the PUSCH based on the CP-OFDM waveform, and when transform precoding is possible (e.g., transform precoding is enabled), the terminal transmits the PUSCH based on the CP-OFDM waveform or the DFT-s-OFDM waveform. PUSCH transmissions may be dynamically scheduled by UL grants in the 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 may be codebook-based or non-codebook-based.

[0073] Figure 5 is a diagram illustrating an ACK / NACK transmission process. Referring to Figure 5, a terminal detects a PDCCH in slot #n. Here, the PDCCH includes downlink scheduling information (e.g., DCI format 1_0, 1_1), and the PDCCH indicates DL allocation-to-PDSCH offset (K0) and PDSCH-HARQ-ACK report offset (K1). For example, DCI formats 1_0, 1_1 include the following information:

[0074] - Frequency domain resource assignment: Indicates the RB set assigned to the PDSCH.

[0075] - Time domain resource assignment: Indicates K0 (e.g. slot offset), 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).

[0076] - PDSCH-to-HARQ_feedback timing indicator: Indicates K1.

[0077] - HARQ process number (4 bits): Indicates the HARQ process ID (Identity) for data (e.g., PDSCH, TB).

[0078] - PUCCH resource indicator (PRI): indicates the PUCCH resource used for UCI transmission from among multiple PUCCH resources in a PUCCH resource set.

[0079] Thereafter, the terminal receives the PDSCH from slot #(n+K0) according to the scheduling information of slot #n, and then transmits UCI via PUCCH in slot #(n1+K1) when the reception of the PDSCH is completed in slot #n1 (where n+K0≦n1). Here, the UCI includes a HARQ-ACK response to the PDSCH. For convenience, in FIG. 5, it is assumed that the SCS for the PDSCH and the SCS for the PUCCH are the same and that slot #n1=slot #n+K0, but the present invention is not limited thereto. If the SCSs are different, K1 is indicated / interpreted based on the SCS of the PUCCH.

[0080] If the PDSCH is configured to transmit up to 1 TB, the HARQ-ACK response consists of 1 bit. If the PDSCH is configured to transmit up to 2 TB, the HARQ-ACK response consists of 2 bits if spatial bundling is not configured, and 1 bit if spatial bundling is configured. If the transmission time of the HARQ-ACK for multiple PDSCHs is specified as slot #(n+K1), the UCI transmitted in slot #(n+K1) includes the HARQ-ACK response for multiple PDSCHs.

[0081] Whether or not the UE should perform spatial bundling for the HARQ-ACK response is configured for each cell group (e.g., RRC / higher layer signaling). As an example, spatial bundling is configured individually for each of the HARQ-ACK response transmitted via the PUCCH and / or the HARQ-ACK response transmitted via the PUSCH.

[0082] Spatial bundling is supported when the maximum number of TBs (or codewords) that can be received at one time (or scheduled by one DCI) in a corresponding serving cell is two (or more than two) (for example, when the upper layer parameter maxNrofCodeWordsScheduledByDCI corresponds to 2-TB). Meanwhile, for 2-TB transmission, more than four layers are used, and for 1-TB transmission, up to four layers are used. As a result, when spatial bundling is configured in a corresponding cell group, spatial bundling is performed on serving cells in the corresponding cell group in which more than four layers can be scheduled. A terminal that wishes to transmit a HARQ-ACK response through spatial bundling on a corresponding serving cell can generate a HARQ-ACK response by performing a bit-wise logical AND operation on A / N bits for multiple TBs.

[0083] For example, assuming that a terminal receives DCI scheduling 2-TB and receives 2-TB via PDSCH based on the DCI, a terminal performing spatial bundling may perform a logical AND operation on a first A / N bit for the first TB and a second A / N bit for the second TB to generate a single A / N bit. As a result, if both the first TB and the second TB are ACK, the terminal reports an ACK bit value to the base station, and if any one of the TBs is NACK, the terminal reports a NACK bit value to the base station.

[0084] For example, if only 1-TB is actually scheduled on a serving cell that is 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 a bit value of 1. As a result, the terminal reports the A / N bit for the 1-TB to the base station as is.

[0085] A base station / terminal has multiple parallel DL HARQ processes for DL ​​transmission. Multiple parallel HARQ processes allow DL transmission to be performed continuously while waiting for HARQ feedback for successful or unsuccessful reception of previous DL transmission. Each HARQ process is associated with a HARQ buffer in the Medium Access Control (MAC) layer. Each DL HARQ process manages state variables related to the number of transmissions of MAC Physical Data Blocks (PDUs) in the buffer, HARQ feedback for MAC PDUs in the buffer, current redundancy version, etc. Each HARQ process is distinguished by a HARQ process ID.

[0086] 6 illustrates a PUSCH transmission process. Referring to FIG. 6, a UE detects 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 include the following information:

[0087] - Frequency domain resource assignment: Indicates the RB set assigned to the PUSCH.

[0088] - Time domain resource assignment: indicates the slot offset K2, 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 are indicated by the Start and Length Indicator Value (SLIV) or are indicated respectively.

[0089] Thereafter, the terminal transmits a PUSCH in slot #(n+K2) according to the scheduling information of slot #n, where the PUSCH includes a UL-SCH TB.

[0090] CSI-related actions

[0091] FIG. 7 is a diagram showing an example of a procedure related to CSI.

[0092] The terminal receives configuration information related to CSI from the base station via RRC signaling (710). The configuration information related to CSI includes at least one of information on a CSI-IM (interference management) resource, information on a CSI measurement configuration, information on a CSI resource configuration, information on a CSI-RS resource, or information on a CSI report configuration.

[0093] - CSI-IM resources are configured for interference measurement (IM) of the terminal. In the time domain, the CSI-IM resource set is configured periodically, semi-persistently, or aperiodically. The CSI-IM resources are configured as Zero Power (ZP)-CSI-RS for the terminal. The ZP-CSI-RS is configured separately from the Non-Zero Power (NZP)-CSI-RS.

[0094] - The UE may assume that the CSI-RS resources for channel measurement configured for one CSI report and the CSI-IM / NZP CSI-RS resources for interference measurement (when the NZP CSI-RS resources are used for interference measurement) are in a QCL relationship with respect to "QCL-Type D" for each resource.

[0095] - The CSI resource configuration includes 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. A CMR (channel measurement resource) is an NZP CSI-RS for CSI acquisition, and an IMR (Interference measurement resource) is an NZP CSI-RS for CSI-IM and IM.

[0096] - CSI-RS may be configured for one or more terminals. A different CSI-RS configuration may be provided for each terminal, or the same CSI-RS configuration may be provided for multiple terminals. CSI-RS can support up to 32 antenna ports. CSI-RS corresponding to N (N is 1 or more) antenna ports are mapped to N RE positions within a time-frequency unit corresponding to one slot and one RB. If N is 2 or more, the N-port CSI-RS are multiplexed by CDM, FDM and / or TDM. CSI-RS is mapped to other REs except REs to which CORESET, DMRS and SSB are mapped. In the frequency domain, CSI-RS is configured for the entire bandwidth, a partial bandwidth portion (BWP) or a part of the bandwidth. CSI-RS is transmitted in each RB in the bandwidth where CSI-RS is configured (i.e., density = 1) or CSI-RS is transmitted 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 onto three subcarriers in each resource block (i.e., density=3). One or more CSI-RS resource sets are configured for a terminal in the time domain. Each CSI-RS resource set includes one or more CSI-RS configurations. Each CSI-RS resource set is configured to be periodic, semi-persistent, or aperiodic.

[0097] - The CSI reporting configuration includes configurations for feedback type, measurement resource, report type, etc. The NZP-CSI-RS resource set is used for the CSI report configuration of the terminal. The NZP-CSI-RS resource set is associated with CSI-RS or SSB. In addition, multiple periodic NZP-CSI-RS resource sets are configured by the TRS resource set. (i) The feedback type includes 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 first layer-reference signal received strength (L1-Reference Signal Received Strength (RSRP), etc. (ii) The measurement resource includes configurations for downlink signals and / or downlink resources on which the terminal performs measurements to determine feedback information. The measurement resource is configured as a ZP and / or NZP CSI-RS resource set associated with the CSI reporting configuration. The NZP CSI-RS resource set includes a CSI-RS set or an SSB set. For example, the L1-RSRP is measured for the CSI-RS set or the SSB set. (iii) The report type includes a configuration for a time when the terminal performs a report and an uplink channel, etc. The report time is configured to be periodic, semi-persistent, or aperiodic. The periodic CSI report is transmitted on the PUCCH. The semi-persistent CSI report is transmitted on the PUCCH or PUSCH based on the MAC CE indicating activation / deactivation. The aperiodic CSI report is indicated by DCI signaling. For example, the CSI request field of the uplink grant indicates one of various report trigger sizes. The aperiodic CSI report is transmitted on the PUSCH.

[0098] The terminal measures the CSI based on configuration information related to the CSI. The CSI measurement includes a procedure of receiving a CSI-RS (720), computing the received CSI-RS, and acquiring the CSI (730).

[0099] The terminal transmits a CSI report to the base station (740). The time and frequency resources available to the UE for CSI reporting are controlled by the base station. The channel state information (CSI) includes at least one of a channel quality indicator (CQI), a precoding matrix indicator (PMI), a CSI-RS resource indicator (CRI), a SS / PBCH block resource indicator (SSBRI), a layer indicator (LI), a rank indicator (RI), an L1-RSRP, and / or an L-SINR.

[0100] 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 are configured by RRC and refer to the CSI-ReportConfig IE. ii) Semi-periodic (SP) CSI reporting is performed on short PUCCH, long PUCCH, or PUSCH. In the case of SP CSI on short / long PUCCH, the periodicity and slot offset are configured by RRC, and CSI reporting is activated / deactivated by another MAC CE / DCI. In the 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). A separate RNTI (SP-CSI C-RNTI) is used for SP CSI reporting on PUSCH. The first CSI reporting timing follows the PUSCH time domain allocation value indicated by DCI, and subsequent CSI reporting timing follows the period set by RRC. DCI format 0_1 ​​includes a CSI request field to activate / deactivate a specific configured SP-CSI trigger state. SP CSI reporting has the same or similar activation / deactivation mechanism as that with data transmission on SPS PUSCH. iii) Aperiodic CSI reporting is performed on PUSCH and is triggered by DCI. In this case, information regarding triggering of aperiodic CSI reporting is conveyed / indicated / configured by MAC-CE. In case of AP CSI with AP CSI-RS, AP CSI-RS timing is configured by RRC, and timing for AP CSI reporting is dynamically controlled by DCI.

[0101] QCL (quasi-co location)

[0102] Two antenna ports are quasi co-located if the channel properties of an antenna port can be inferred from the channel of the other antenna port. The channel properties include one or more of the following: Delay spread, Doppler spread, Frequency / Doppler shift, Average received power, Received Timing / average delay, and Spatial RX parameters.

[0103] In relation to the PDCCH / PDSCH QCL, multiple TCI (Transmission Configuration Indication) states are configured in the terminal via higher layer signaling. Up to 64 TCI states are RRC configured for the PDCCH QCL, and up to 128 TCI states are RRC configured for the PDSCH QCL. In the case of the PDSCH QCL, a list for configuring multiple TCI-States is provided by the higher layer parameter PDSCH-Config.

[0104] Each TCI-State is associated with QCL configuration parameters between one or two DL reference signals and the DM-RS port of the PDSCH / PDCCH. The QCL configuration parameters include qcl-Type1 for the first DL RS and qcl-Type2 for the second DL RS. The QCL type corresponds to one of the following:

[0105] - 'QCL-TypeA':{Doppler shift, Doppler spread, average delay, delay spread}

[0106] - 'QCL-TypeB':{Doppler shift, Doppler spread}

[0107] -'QCL-TypeC':{Doppler shift, average delay}

[0108] -'QCL-TypeD':{Spatial Rx parameter}

[0109] The TCI state set via RRC signaling is deactivated as default.

[0110] In the case of the PDSCH QCL, among the RRC-configured TCI states, up to eight TCI states are activated by the MAC CE. The TCI field included in the DCI that schedules the PDSCH indicates one of the activated TCI states (e.g., when the provision of the TCI field in the DCI is activated by RRC signaling), and the terminal receives the PDSCH based on the QCL information corresponding to the indicated TCI state.

[0111] In the case of the PDCCH QCL, among the RRC configured TCI states, one TCI state is activated for the corresponding CORESET by the MAC CE. In order to receive the PDCCH in the corresponding CORESET, the terminal receives the PDCCH based on the QCL information corresponding to the activated TCI state.

[0112] Operations related to M-TRP (multiple-transmission / reception point)

[0113] The M-TRP transmission method, in which M TRPs transmit data to one terminal, can be broadly divided into 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.

[0114] Meanwhile, the DL M-TRP URLLC transmission method means a method in which multiple TRPs transmit the same data / DCI using different space (e.g., layers / ports) / time / frequency resources. For example, TRP 1 transmits specific data / DCI in resource 1, and TRP 2 transmits the specific data / DCI (i.e., the same data / DCI) in resource 2.

[0115] That is, when the DL M-TRP URLLC transmission mode is configured, the terminal receives the same data / DCI using different space / time / frequency resources. In this case, the terminal receives an instruction from the base station regarding the QCL RS / type (i.e., DL TCI state) to be used in the space / time / frequency resource for receiving the data / DCI.

[0116] For example, when the data / DCI is received on resource 1 and resource 2, the base station instructs the terminal on the DL TCI state used on resource 1 and the DL TCI state used on resource 2. The terminal can achieve high reliability by receiving the data / DCI via resource 1 and resource 2. This M-TRP URLLC transmission method is applied to PDSCH / PDCCH.

[0117] The UL M-TRP URLLC transmission method refers to a method in which multiple TRPs receive the same data / UCI from one UE using different space / time / frequency resources. For example, TRP 1 receives the same data / UCI from the UE in resource 1, and TRP 2 receives the same data / UCI from the UE in resource 2. In addition, TRP 1 and TRP 2 share the data / UCI received from the UE via a backhaul link (connected between the TRPs).

[0118] That is, when the UL M-TRP URLLC transmission method is configured, the terminal transmits the same data / UCI to each TRP using different space / time / frequency resources. At this time, the terminal receives instructions from the base station of the Tx beam and Tx power (i.e., UL TCI state) to be used in the space / time / frequency resources to transmit the same data / UCI. For example, when the same data / UCI is transmitted in resource 1 and resource 2, the terminal receives instructions from the base station of the UL TCI state to be used in resource 1 and the UL TCI state to be used in resource 2. Such UL M-TRP URLLC is applied to PUSCH / PUCCH.

[0119] Also, from the viewpoint of DCI transmission, the M-TRP transmission method is divided into i) an M-TRP transmission method based on M-DCI (multiple DCI) in which each TRP transmits different DCI, and ii) an M-TRP transmission method based on S-DCI (single DCI) in which one TRP transmits DCI. For example, in the case of S-DCI, all scheduling information for data transmitted by the M-TRP needs to be transmitted through one DCI, and therefore, it is used in an ideal BH (ideal BackHaul) environment in which dynamic cooperation between two TRPs is possible.

[0120] Regarding M-TRP transmission and reception in the Rel-16 NR standardization, PDSCH transmission and reception using the S-DCI-based M-TRP transmission method and the M-DCI-based M-TRP transmission method are supported.

[0121] First, the S-DCI-based M-TRP PDSCH transmission method will be described.

[0122] For S-DCI-based M-TRP PDSCH transmission, one of SDM / FDM / TDM methods is used. 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 Tx beams (i.e., QCL RS or TCI states). This increases the number of layers compared to the conventional S-TRP transmission method, thereby improving the transmission capacity. In addition, when one TB is transmitted using multiple layers, some layers are transmitted to TRP 1 and other layers are transmitted to TRP 2, thereby improving channel reliability through diversity gain.

[0123] In the case of FDM, two schemes, schemes 2a and 2b, are supported. Here, scheme 2a is a scheme in which one TB is transmitted to multiple RBs, but RBs belonging to different RB groups are transmitted in different Tx beams (i.e., QCL RS or TCI states). Scheme 2b is a scheme in which the same TB is transmitted to different RB groups, but RBs belonging to different RB groups are transmitted in different Tx beams (i.e., QCL RS or TCI states). In the case of TDM, two schemes, schemes 3 and 4, are supported. Here, scheme 4 (i.e., inter-slot TDM) is a scheme in which the same TB is repeatedly transmitted in multiple slots, but slots belonging to different slot groups are transmitted in different Tx beams (i.e., QCL RS or TCI states). On the other hand, Scheme 3 (i.e., intra-slot TDM) is a scheme in which the same TB is repeatedly transmitted from multiple OFDM symbol groups, but some OFDM symbol groups and other OFDM symbol groups are transmitted in different Tx beams (i.e., QCL RS or TCI states).

[0124] Next, the M-DCI-based M-TRP PDSCH transmission method will be described.

[0125] M-DCI based MTRP PDSCH transmission is a method in which each TRP schedules and transmits PDSCH via DCI. That is, TRP 1 transmits PDSCH 1 via DCI 1, and TRP 2 transmits PDSCH 2 via DCI 2. When PDSCH 1 and PDSCH 2 are superimposed on the same frequency-time resource, two PDSCHs are received for the same RE, improving resource efficiency and increasing transmission capacity. For this purpose, the concept of a CORESET pool, which means a group of multiple CORESETs, has been introduced. For example, TRP 1 transmits PDCCH via a CORESET belonging to CORESET pool 0, and also transmits PDSCH scheduled by the PDCCH. TRP 2 transmits PDCCH via a CORESET belonging to CORESET pool 1, and also transmits PDSCH scheduled by the PDCCH.

[0126] In the case of PUSCH, a specific TRP also schedules PUSCH transmission to a terminal via a CORESET belonging to each COERSET pool. For example, some PUCCH resources are scheduled by TRP 1, and other PUCCH resources are scheduled by TRP 2. The terminal transmits independent PUSCH / PUCCH to each of TRP 1 and 2.

[0127] In addition, the terminal recognizes PUSCHs (or PUCCHs) scheduled by DCIs received based on different CORESETs (or CORESETs belonging to different CORESET groups) as PUSCHs (or PUCCHs) to be transmitted to different TRPs, or as PUSCHs (or PUCCHs) of different TRPs. In addition, the method for UL transmissions (e.g., PUSCHs / PUCCHs) to be transmitted to different TRPs is similarly applied to UL transmissions to different panels belonging to the same TRP.

[0128] Hereinafter, CORESET group ID (or COERSET pool index with the same meaning) means an index / identification information (e.g., ID) for distinguishing CORESET for each TRP / panel. Also, CORESET group means a group / union of CORESETs distinguished by an index / identification information (e.g., ID) / CORESET group ID for distinguishing CORESET for each TRP / panel. As an example, CORESET group ID is specific index information defined in a CORESET configuration. That is, a CORESET group is set / indicated / defined by an index defined in a CORESET configuration for each CORESET. And / or, CORESET group ID means an index / identification information / indicator, etc. for distinguishing / identifying between CORESETs set / associated with each TRP / panel.

[0129] Hereinafter, the CORESET group ID may be expressed as a specific index / specific identification information / specific indicator for distinguishing / identifying between CORESETs set / associated with each TRP / panel. The information is set / indicated through higher layer signaling (e.g., RRC signaling, MAC-CE, etc.) and / or physical layer signaling (e.g., DCI). As an example, it is set / instructed to perform PDCCH detection for each TRP / panel in the CORESET group unit, and it is set / instructed to separate and manage / control UCI (e.g., CSI, HARQ-ACK / NACK, SR, etc.) and / or uplink physical channel resources (e.g., PUCCH / PRACH / SRS resources) for each TRP / panel in the CORESET group unit. And / or, HARQ ACK / NACK (process / retransmission) for PDSCH / PUSCH, etc. scheduled for each TRP / panel in the CORESET group unit is managed.

[0130] For example, the ControlResourceSet IE (information element), which is an upper layer parameter, includes a CORESET-related ID (e.g., controlResourceSetID), a CORESET pool index for the CORESET (e.g., CORESETPoolIndex), time / frequency resource settings of the CORESET, TCI information related to the CORESET, etc. As an example, the CORESET pool index (e.g., CORESETPoolIndex) is set to 0 or 1. The CORESET group described above in the present invention corresponds to the CORESET pool, and the CORESET group ID corresponds to the CORESET pool index (e.g., CORESETPoolIndex).

[0131] Furthermore, in relation to M-TRP transmission and reception in the Rel-17 NR standard, M-TRP PDCCH / PDSCH SFN transmission, S-DCI-based M-TRP PUSCH repeat transmission, and single PUCCH resource-based M-TRP PUCCH repeat transmission are supported. In this transmission method, the same contents (i.e., DCI / UL TB / UCI, etc.) are repeatedly transmitted according to URLLC target improvement for increasing reliability. Here, M-TRP PDCCH repeat transmission is performed based on TDM or FDM, M-TRP PDCCH / PDSCH SFN transmission is performed at the same time / frequency / layer, S-DCI-based M-TRP PUSCH repeat transmission is performed based on TDM, and single PUCCH resource-based M-TRP PUCCH repeat transmission is performed based on TDM.

[0132] First, the S-DCI-based M-TRP PDCCH repetitive transmission method will be described.

[0133] In the NR Rel-17 standard, multiple CORESETs with different TCI states (i.e., different QCL RSs) are configured in a terminal for M-TRP PDCCH repeated transmission, and multiple SS (Search Space) sets linked to the CORESETs are configured. The base station instructs / configures the terminal that the SS set linked to one CORESET and the SS set linked to the other CORESET are linked for repeated transmission. As a result, the terminal knows that the PDCCH candidates of the SS set are repeatedly transmitted.

[0134] For example, two CORESETs, CORESET 0 and CORESET 1, are configured in a terminal, and CORESET 0 and CORESET 1 are connected to SS set 0 and SS set 1, respectively, and SS set 0 and SS set 1 are linked. The terminal can determine that the same DCI is repeatedly transmitted in the PDCCH candidate of SS set 0 and the PDCCH candidate of SS set 1, and can determine that a specific PDCCH candidate of SS set 0 and a specific PDCCH candidate of SS set 1 are a pair set to repeatedly transmit the same DCI based on a specific rule. The two PDCCH candidates are referred to as linked PDCCH candidates, and when the terminal properly receives any one of the two PDCCH candidates, it can successfully decode the DCI. However, when receiving PDCCH candidates of SS set 0, the terminal uses a QCL RS (i.e., DL beam) in the TCI state of COERSET 0 connected to SS set 0, and when receiving PDCCH candidates of SS set 1, the terminal uses a QCL RS (i.e., DL beam) in the TCI state of COERSET 1 connected to SS set 1. In this way, the terminal receives linked PDCCH candidates using different beams.

[0135] Next, the transmission method of the M-TRP SFN PDCCH / PDSCH will be described.

[0136] As one of the M-TRP PDCCH repeat transmission methods, multiple TRPs repeatedly transmit the same DCI via the same time / frequency / DMRS port, and such a transmission method is called SFN PDCCH transmission. However, for SFN PDCCH transmission, the base station sets multiple TCI states in one CORESET instead of setting multiple CORESETs in which different TCI states are set. When the terminal receives PDCCH candidates through the SS set connected to the one CORESET, the terminal performs channel estimation of the PDCCH DMRS and attempts decoding using all of the multiple TCI states.

[0137] Also, in the above-mentioned M-TRP PDSCH repeated transmission, the two TRPs repeatedly transmit the channel on different resources. However, even if the two TRPs use the same resources, i.e., the same channel is repeatedly transmitted through the same frequency / time / layer (i.e., DMRS port), the reliability of the channel can be improved. In this case, the same channel repeatedly transmitted cannot be divided into resources and is received by matching during transmission (i.e., air), so that it is recognized as one channel (e.g., a composite channel) from the viewpoint of the receiving end (e.g., terminal). For SFN PDSCH transmission, two DL TCI states for PDSCH DMRS reception are configured in the terminal.

[0138] Next, the S-DCI-based M-TRP PUSCH repetitive transmission method will be described.

[0139] In the NR Rel-17 standardization, the base station configures two SRS sets in the terminal for S-DCI-based M-TRP PUSCH transmission, and each of the sets is used to indicate UL Tx port and UL beam / QCL information for TRP 1 and TRP 2. In addition, the base station can indicate SRS resources for each SRS resource set through two SRI fields included in one DCI and indicate up to two PC parameter sets. For example, the first SRI field indicates SRS resources and PC parameter sets defined in SRS resource set 0, and the second SRI field indicates SRS resources and PC parameter sets defined in SRS resource set 1. The terminal receives an indication of the UL Tx port, PC parameter set, and UL beam / QCL information for TRP 1 through the first SRI field, and thus the terminal transmits PUSCH through a TO corresponding to SRS resource set 0. Similarly, the terminal receives an indication of the UL Tx port, PC parameter set, and UL beam / QCL information for TRP 2 through the second SRI field, and the terminal transmits a PUSCH in a TO corresponding to SRS resource set 1. In addition to the SRI field, the conventional one field is expanded to two fields so that the TPMI, PTRS, TPC field, etc. can be indicated for each TRP. In addition, a 2-bit SRS resource set indication field is introduced to select a specific one of the two SRS sets to perform STRP PUSCH repeated transmission, and both of the two can be selected to perform MTRP PUSCH repeated transmission. That is, when the field is 00 or 01, it indicates SRS set 0 or SRS set 1, respectively, and STRP PUSCH transmission corresponding to each set is performed, and when the field is 10, it indicates (SRS set 0, SRS set 1), and MTRP PUSCH transmission is performed in the order in which the set pairs are indicated. That is, set 0 corresponds to the first PUSCH TO. If the set pair is 11 (SRS set 1, SRS set 0), the MTRP PUSCH transmission is performed in the indicated order.That is, set 1 corresponds to the first PUSCH TO.

[0140] Next, a single PUCCH resource-based M-TRP PUCCH repetition transmission method will be described.

[0141] In the NR Rel-17 standard, the base station activates / configures two spatial relation info (spatial relation info) for a single PUCCH resource (if FR1, activates / configures two PC parameter sets) to the terminal for single PUCCH resource-based M-TRP PUCCH transmission. When UL UCI is transmitted through the PUCCH resource, each of the spatial relation info is used to indicate spatial relation information toward TRP 1 and TRP 2 to the terminal. For example, according to a value indicated in the first spatial relation information, the terminal receives an indication of Tx beam / PC parameters toward TRP 1, and the terminal uses the information to transmit PUCCH with a TO corresponding to TRP 1. Similarly, according to a value indicated in the second spatial relation information, the terminal receives an indication of Tx beam / PC parameters toward TRP 2, and the terminal uses the information to transmit PUCCH with a TO corresponding to TRP 2.

[0142] In addition, for the M-TRP PUCCH repeated transmission, the setting method is improved so that two spatial relation info are set in the PUCCH resource. That is, when a PC (power control) parameter such as PLRS, Alpha, P0, closed loop index, etc. is set in each spatial relation information, the spatial relation RS is set. As a result, the PC information and spatial relation RS information corresponding to two TRPs are set by the two spatial relation information. In this way, the terminal transmits UCI (i.e., CSI, ACK / NACK, SR, etc.) PUCCH using the first spatial relation information in the first TO, and transmits the same UCI PUCCH using the second spatial relation information in the second TO. In the present invention, the PUCCH resource in which two pieces of spatial relation information are set is called an M-TRP PUCCH resource, and the PUCCH resource in which one piece of spatial relation information is set is called an S-TRP PUCCH resource.

[0143] TCI (transmission configuration indication) status / beam indication

[0144] In addition, for purposes of describing the present disclosure, when receiving / transmitting data / DCI / UCI via a specific space / time / frequency resource, using (or mapping) a specific TCI state (or TCI) means, 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 a specific space / time / frequency resource, and receiving / demodulating the data / DCI / UCI using the estimated channel.

[0145] Furthermore, when receiving / transmitting data / DCI / UCI via a particular space / time / frequency resource, using (or mapping) a particular TCI state (or TCI) means, in the UL case, transmitting / modulating the DMRS and data / UCI using the Tx beam and / or Tx power indicated by the particular TCI state in the particular space / time / frequency resource.

[0146] The UL TCI state also includes Tx beam or Tx power information of the terminal. The base station also sets spatial relation info, etc., to the terminal through other parameters instead of the TCI state.

[0147] For example, the UL TCI state may be directly indicated to the terminal via a UL grant DCI, or the UL TCI state may refer to spatial relationship information of SRS resources indicated via an SRS resource indicator (SRI) field of the UL grant DCI, or the UL TCI state may refer to an open loop (OP) Tx power control parameter linked to a value indicated via the SRI field of the UL grant DCI.

[0148] Here, the OL Tx power control parameters include, for example, j (index for OP parameter Po and alpha (maximum 32 parameter value sets per cell)), q_d (index of DL RS resource for PL (path loss) measurement (maximum 4 measurements per cell)), and / or I (closed loop power control process index (maximum 2 processes per cell)).

[0149] For convenience of explanation of the present disclosure, it is assumed that two TRPs cooperate with each other to perform transmission / reception operations, but is not limited thereto. That is, the present disclosure can be extended to a multi-TRP environment of three or more, and can be extended to an environment in which the same TRP transmits / receives using different panels or beams. A terminal recognizes different TRPs as different TCI states. When a terminal transmits / receives data / DCI / UCI using TCI state 1, it means transmitting / receiving data / DCI / UCI from (or to) TRP1.

[0150] TO (Transmission Occasion) refers to each channel transmitted at a different time when multiple channels are TDMed, each channel transmitted to a different frequency / RB when multiple channels are FDMed, and each channel transmitted to a different layer / beam / DMRS port when multiple channels are SDMed. One TCI state is mapped to each TO. When the same channel is repeatedly transmitted, complete data / DCI / UCI is transmitted to one TO, and the receiving end can receive multiple TOs to increase the reception success rate.

[0151] Single DCI based multi-TB PUSCH / PDSCH scheduling

[0152] In Rel.17 NR, a method is supported in which one DCI simultaneously schedules multiple PUSCHs / PDSCHs in the ultra-high frequency band (beyond 5.26GHz). For example, multiple TDRAs (=TOs) can be indicated at once through the TDRA field of the PUSCH scheduling DCI, and different TBs are transmitted through the PUSCH for each TO. The FDRA, MCS, TPMI, and SRI values ​​of the DCI are commonly applied to multiple scheduled TBs. In addition, NDI and RV are indicated for each TB through the DCI, and one value is indicated for the HARQ number, which increases sequentially in the order of the TOs based on the initial TO.

[0153] STxMP(simultaneous transmission across multiple panels)

[0154] Recently, for the Rel.18 NR standardization, a method in which a UE transmits multiple channels / RSs of the same kind or multiple channels / RSs of different kinds at the same time is being discussed. Conventional UEs are limited in transmitting multiple channels / RSs at a time (e.g., multiple SRS resources of different SRS sets can be transmitted at the same time for UL beam measurement, but multiple PUSCHs cannot be transmitted at the same time), but in the case of future advanced terminals, such restrictions can be relaxed and multiple channels or RSs can be transmitted at the same time using multiple transmission panels, and this UE is called STxMP UE. For example, two PUSCHs corresponding to two UL TBs are scheduled in 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 respectively set for transmitting PUSCHs 1 and 2. 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.

[0155] When the base station schedules PUSCH via DCI, it indicates whether the PUSCH is to be transmitted in STxMP, in a single panel, or repeatedly transmitted in MTRP PUSCH. Of course, the UE must have STxMP capability, and the STxMP mode must be enabled in advance by RRC signaling, etc. For this purpose, the conventional SRS resource set indication field is redefined and used, or a new DCI field is introduced.

[0156] Enhanced UL / DL beam configuration in integrated TCI framework

[0157] In NR Rel-15 / Rel-16, higher layer signaling such as RRC and MAC CE is mainly used for beam indication / update operations for reception / transmission between a base station and a terminal, and DCI-based beam indication operations are supported for some channels / RS (PDSCH, PUSCH, etc.).

[0158] 8 is a diagram for explaining the concept of a unified TCI framework introduced in NR Rel.17. In the unified TCI framework of Rel.17, not only the DL TCI state but also the UL TCI state may be indicated via DL DCI (e.g., DCI format 1-1 or 1-2), or only the UL TCI state may be indicated via DL DCI without indicating the DL TCI state. In this way, Rel.17 supports the operation of dynamic beam update by joint DL / UL TCI state indication or separate DL / UL TCI state indication.

[0159] Such dynamic beam update operations include common beam updates, for example, in which the base station instructs the terminal to use one beam in common for multiple specific channel / RS combinations via DCI and / or MAC-CE, causing the terminal to perform a common beam update operation.

[0160] Therefore, the method used for setting UL beam and power control (PC) in the conventional Rel.15 / 16 is replaced by the UL TCI state indication method in Rel.17. In Rel.17, one UL TCI state is indicated through the TCI field of DL DCI, and the UL TCI state is applied to all PUSCHs and all PUCCHs after a predetermined time called beam application time, and is applied to some or all of the indicated SRS resource sets. Specifically, in the case of UL, common beam update is applied to all or a subset of DG (dynamic grant) / CG (configured grant)-PUSCH and dedicated PUCCH, and aperiodic CSI-RS / BM and SRS for tracking are set as target channels / RS for common beam update.

[0161] In addition, in the case of DL, common beam update is applied to the UE-dedicated CORESET and UE-dedicated reception on PDSCH.

[0162] For such common beam applicability, Rel-17 beam pointing operations are primarily related to single-TRP operations.

[0163] In the unified TCI framework of Rel.17, if the number of DL TCI states is M and the number of UL TCI states is N, then the number of DL / UL TCI states for common beam update is M=1 / N=1, respectively.

[0164] Meanwhile, in the standardization process of the integrated TCI framework, the discussion on the M and N values ​​can be summarized as shown in Table 6 below. In Table 6, (iii) M=N=1 is related to the common beam update.

[0165] [Table 6]

[0166] Meanwhile, in the recent NR Rel. 18 standardization, a method of indicating multiple UL TCI states (and / or DL ​​TCI states) via the TCI field of DL DCI (DL grant DCI, for example, DCI format 1_x) is being discussed.

[0167] In addition, in relation to the NR Rel-18 MIMO standardization, discussions will be conducted on extensions (M>1 and / or N>1) to the setting of the integrated TCI framework and the multi-TRP operation according to the setting. Table 7 is the subject of discussion in relation to the NR Rel-18 MIMO standardization. For example, as a specific embodiment of multi-TRP operation, M DL TCI states are associated with M DL signal transmission points, and N UL TCI states are associated with N UL signal reception points, but are not limited thereto. Meanwhile, in Table 6 related to Rel.17, M>1 and / or N>1 in (iv) to (vi) are for single-TRP operation, but the extensions (M>1 and / or N>1) to the setting of the integrated TCI framework discussed in Rel.18 are related to multi-TRP operation.

[0168] [Table 7-1] [Table 7-2]

[0169] When the setting of M=N=1 in Rel-17 multi-beam is expanded and the values ​​of M and N are set to the same / different as 1 or 2, respectively, multiple TCI states must be set, unlike the single TCI state of the conventional Rel.17. Also, a method of setting each of the target channels / RSs of common beam applicability using each TCI state in the form of a subset must be considered.

[0170] We propose a method for setting DCI and / or MAC-CE TCI status fields for beam indication purposes according to M and / or N values ​​in a unified framework and utilizing beam indication thereby.

[0171] According to one embodiment of the present disclosure, the number of TCI fields in DCI and / or MAC-CE for beam indication is indicated / activated (determined) by M>1 and / or N>1.

[0172] - Configuration for M>1 and / or N>1 (configuration of M, N values ​​and / or TCI states corresponding to M, N) is provided via RRC or MAC-CE.

[0173] - if M ≠ N, the number of TCI fields in the beam indication DCI / MAC-CE follows the larger of the M and N configuration values, or if M ≠ N, the TCI field for UL or DL ​​set to a smaller value by a pre-defined / explicit method is indicated.

[0174] - Each DL / UL target channel / RS for common beam applicability is configured singly or in the form of multiple subsets (RRC configured) by M and / or N values, which are pre-defined and associated with each TCI field or configured by a separate indicator.

[0175] This proposal refers to a method for indicating TCI states when M and N for DL / UL beams and common beam applicability in a unified TCI framework are set to values ​​of 2 or more (not the conventional 1). In the conventional Rel-17, beam indication DCI and / or MAC-CE for common beam indication indicated joint or separate DL / UL TCI states by a single TCI state (M=N=1), but when M>1 and / or N>1 are set by RRC or MAC-CE, a method is required for supporting (at least) two TCI states in the beam indication DCI / MAC-CE.

[0176] As a specific example, the joint TCI state 0 is indicated through the TCI field #1, and the joint TCI state 3 is indicated through the TCI field #2, but is not limited thereto. As an example, if any one of M and N is set to 2, the number of TCI fields in the beam instruction DCI / MAC-CE may be 2, but is not limited thereto. On the other hand, assuming such a situation, if M=N=2, there is no problem, but if the setting values ​​for DL / UL are different, such as {M=2, N=1} or {M=1, N=2}, it becomes unclear which TCI field is used to perform the operation of the integrated TCI framework by M / N. Specifically, if {M=2, N=1}, both TCI field #1 and TCI field #2 are used for DL, but it becomes unclear whether to follow TCI field #1 or TCI field #2 for UL. To solve this problem, the TCI field corresponding to the smaller value of M or N is used in a decreasing / increasing order according to a predetermined method (e.g., M=2 and N=1 case, TCI field #1 for DL / UL, TCI field #2 for DL ​​only with decreasing order for N=1), or explicitly indicated which TCI field corresponds to the M / N setting (e.g., TCI field = { #1, #2} for M=2 and TCI field = {1} for N=1).

[0177] - Each DL / UL target channel / RS for common beam applicability is configured singly by M and / or N values ​​or in the form of multiple subsets (RRC configured), which are pre-defined and associated with each TCI field or associated with a separate indicator.

[0178] This proposal refers to a method of indicating TCI states when M and N for DL / UL beams and common beam applicability in an integrated TCI framework are set to values ​​of 2 or more (not the conventional 1). In the conventional Rel-17, beam indication DCI and / or MAC-CE for common beam indication indicated joint or separate DL / UL TCI states by a single TCI state (M=N=1), but when M>1 and / or N>1 are set by RRC or MAC-CE, the beam indication DCI / MAC-CE also needs a method to support (at least) two TCI states.

[0179] As a specific example, joint TCI state 0 is indicated through TCI field #1, and joint TCI state 3 is indicated through TCI field #2, but is not limited thereto. As an example, if any one of M and N is set to 2, the number of TCI fields in the beam indication DCI / MAC-CE may be 2, but is not limited thereto. On the other hand, assuming such a situation, if M=N=2, there is no problem, but if the setting values ​​for DL / UL are different, such as {M=2, N=1} or {M=1, N=2}, it becomes unclear which TCI field is used to perform the operation of the integrated TCI framework by M / N. Specifically, if {M=2, N=1}, both TCI field #1 and TCI field #2 are used for DL, but it becomes unclear whether to follow TCI field #1 or TCI field #2 for UL. To solve this problem, either use the TCI field corresponding to the smaller of M and N in a decreasing / increasing order according to a pre-defined method (e.g., M=2 and N=1 case, TCI field#1 for DL / UL, TCI field#2 for DL ​​only with decreasing order for N=1), or explicitly indicate which TCI field corresponds to the M / N setting (e.g., TCI field={#1, #2}for M=2 and TCI field={1} for N=1).

[0180] 11 is an embodiment of a method for transmitting a PDCCH signal by a base station according to at least some of the above-mentioned proposals. The present invention is not limited to FIG. 11, and the above content can be referred to for understanding FIG. 11.

[0181] Referring to FIG. 11, a base station transmits configuration information for a transmission configuration indication (TCI) to a terminal (UE) through higher layer signaling (B05).

[0182] The base station transmits downlink control information (DCI) including one TCI field to the terminal via a physical downlink control channel (PDCCH) signal (B10).

[0183] The base station indicates, to the terminal, TCI state information for at least some of a plurality of signals based on the TCI field, the plurality of signals including a first set of signals including a first physical downlink shared channel (PDSCH) signal and a second set of signals including a second PDSCH signal, and at least one of a plurality of codepoints for the TCI field is mapped to a combination of first TCI state information for the first set of signals including the first PDSCH signal and second TCI state information for the second set of signals including the second PDSCH signal.

[0184] As an example, the first TCI status information is first joint TCI status information in which a first DL TCI for a first downlink (DL) signal and a first UL TCI for a first uplink (UL) signal are joined among the signals of the first set, and the second TCI status information is second joint TCI status information in which a second DL TCI for a second DL signal and a second UL TCI for a second UL signal are joined among the signals of the second set.

[0185] As an example, the first TCI status information indicates at least one of a first DL TCI for a first downlink (DL) signal among the signals of the first set or a first UL TCI that is separate from the first DL TCI and is a UL TCI for a first uplink (UL) signal, and the second TCI status information indicates at least one of a second DL TCI for a second DL signal among the signals of the second set or a second UL TCI that is separate from the second DL TCI and is a UL TCI for a second UL signal.

[0186] The first set of signals includes at least one of a first PDCCH signal, a first channel state information-reference signal (CSI-RS), a first physical uplink shared channel (PUSCH) signal, a first physical uplink control channel (PUCCH) signal, and a first sounding reference signal (SRS) on a first control resource set (CORESET). The second set of signals includes at least one of a second PDCCH signal, a second CSI-RS, a second PUSCH signal, a second PUCCH signal, and a second SRS on a second CORESET.

[0187] First subset information for at least some of the signals in the first set to which the first TCI status information applies, and second subset information for at least some of the signals in the second set to which the second TCI status information applies are configured in the terminal via higher layer signaling.

[0188] First quasi-co location (QCL) information is applied in common to the first set of signals based on the first TCI state information, and second QCL information is applied in common to the second set of signals based on the second TCI state information.

[0189] The DCI has a DL-grant DCI format for downlink (DL) scheduling.

[0190] At least one code point mapped to a combination of the first TCI status information and the second TCI status information is associated with a multi-transmission / reception point (TRP) operation.

[0191] The base station transmits or receives at least one of the first set of signals based on the first TCI status information and the second set of signals based on the second TCI status information.

[0192] FIG. 12 illustrates a communication system 1 to which the present invention can be applied.

[0193] Referring to FIG. 12, the communication system 1 includes wireless devices, base stations, and networks. Here, the wireless devices refer to devices that communicate using wireless connection technology (e.g., 5G NR (New RAT), LTE (Long Term Evolution)), and are also referred to as communication / wireless / 5G devices. The wireless devices include, but are not limited to, a robot 100a, vehicles 100b-1, 100b-2, an XR (eXtended Reality) device 100c, a handheld device (Hand-held Device) 100d, a home appliance 100e, an IoT (Internet of Thing) device 100f, and an AI device / server 400. For example, the vehicles include vehicles equipped with wireless communication functions, autonomous vehicles, vehicles capable of inter-vehicle communication, and the like. Here, the vehicles include UAVs (Unmanned Aerial Vehicles) (e.g., drones). XR devices include Augmented Reality (AR) / Virtual Reality (VR) / Mixed Reality (MR) devices, and are embodied in the form of Head-Mounted Devices (HMDs), Head-Up Displays (HUDs) mounted on vehicles, TVs, smartphones, computers, wearable devices, home appliances, digital signage, vehicles, robots, etc. Portable devices include smartphones, smart pads, wearable devices (e.g., smart watches, smart glasses), computers (e.g., notebook computers, etc.), etc. Home appliances include TVs, refrigerators, washing machines, etc. IoT devices include sensors, smart meters, etc. For example, base stations and networks may also be embodied as wireless devices, and a specific wireless device 200a may operate as a base station / network node for other wireless devices.

[0194] The wireless devices 100a to 100f are connected to a network 300 via a base station 200. AI (Artificial Intelligence) technology is applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f are connected to an AI server 400 via the network 300. The network 300 is configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. 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, the vehicles 100b-1 and 100b-2 can communicate directly (e.g., V2V (Vehicle to Vehicle) / V2X (Vehicle to everything) communication). Also, an IoT device (e.g., a sensor) can directly communicate with another IoT device (e.g., a sensor) or another wireless device 100a to 100f.

[0195] Wireless communication / connections 150a, 150b, and 150c are performed between the wireless devices 100a to 100f / base stations 200 and the base stations 200. Here, the wireless communication / connections are performed by various wireless connection technologies such as uplink / downlink communication 150a and sidelink communication 150b (or D2D communication) and communication between base stations 150c (e.g., relay, IAB (Integrated Access Backhaul) (e.g., 5G NR). Through the wireless communication / connections 150a, 150b, and 150c, the wireless devices and base stations, and the base stations and base stations can transmit / receive wireless signals to each other. For example, the wireless communication / connections 150a, 150b, and 150c can transmit / receive signals via various physical channels. To this end, based on various proposals of the present invention, any one of various configuration information setting processes for transmitting / receiving wireless signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, resource mapping / demapping, etc.), and resource allocation processes is performed.

[0196] FIG. 13 illustrates a wireless device to which the present invention can be applied.

[0197] 13, a first wireless device 100 and a second wireless device 200 transmit and receive wireless signals using various wireless access technologies (e.g., LTE, NR), where {first wireless device 100, second wireless device 200} corresponds to {wireless device 100x, base station 200} and / or {wireless device 100x, wireless device 100x} in FIG.

[0198] The first wireless device 100 includes one or more processors 102 and one or more memories 104, and further includes one or more transceivers 106 and / or one or more antennas 108. The processor 102 is configured to control the memory 104 and / or the transceiver 106 to implement the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. For example, the processor 102 processes information in the memory 104 to generate a first information / signal, and then transmits a wireless signal including the first information / signal via the transceiver 106. The processor 102 also receives a wireless signal including a second information / signal via the transceiver 106, and then stores information obtained from signal processing of the second information / signal in the memory 104. The memory 104 is coupled to the processor 102 and stores various information related to the operation of the processor 102. For example, the memory 104 stores software code including instructions for performing some or all of the processes controlled by the processor 102 or for performing the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. Here, the processor 102 and memory 104 are part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 106 is coupled to the processor 102 and transmits and / or receives wireless signals via one or more antennas 108. The transceiver 106 includes a transmitter and / or a receiver. The transceiver 106 may also be referred to as an RF (Radio Frequency) unit. In the present invention, a wireless device may also refer to a communication modem / circuit / chip.

[0199] The second wireless device 200 includes one or more processors 202 and one or more memories 204, and further includes one or more transceivers 206 and / or one or more antennas 208. The processor 202 is configured to control the memory 204 and / or the transceiver 206 to implement the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. For example, the processor 202 processes information in the memory 204 to generate a third information / signal, and then transmits a wireless signal including the third information / signal via the transceiver 206. The processor 202 also receives a wireless signal including a fourth information / signal via the transceiver 206, and then stores information obtained from the signal processing of the fourth information / signal in the memory 204. The memory 204 is coupled to the processor 202 and stores various information related to the operation of the processor 202. For example, the memory 204 stores software code including instructions for performing some or all of the processes controlled by the processor 202 or for performing the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein. Here, the processor 202 and memory 204 are part of a communication modem / circuit / chip designed to implement a wireless communication technology (e.g., LTE, NR). The transceiver 206 is coupled to the processor 202 and transmits and / or receives wireless signals via one or more antennas 208. The transceiver 206 includes a transmitter and / or a receiver. The transceiver 206 may also be referred to as an RF unit. In the present invention, a wireless device may also refer to a communication modem / circuit / chip.

[0200] The hardware elements of the wireless device 100, 200 are described in more detail below. One or more protocol layers may be implemented by, but are not limited to, one or more processors 102, 202. For example, the one or more processors 102, 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, SDAP). The 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, suggestions, methods and / or flowcharts disclosed herein. The one or more processors 102, 202 may generate messages, control information, data or information according to the descriptions, functions, procedures, suggestions, methods and / or flowcharts disclosed herein. The one or more processors 102, 202 may generate and provide signals (e.g., baseband signals) including PDUs, SDUs, messages, control information, data or information according to the functions, procedures, suggestions and / or methods disclosed herein to the one or more transceivers 106, 206. The one or more processors 102, 202 may receive signals (e.g., baseband signals) from the one or more transceivers 106, 206 and obtain the PDUs, SDUs, messages, control information, data or information according to the descriptions, functions, procedures, suggestions, methods and / or flowcharts disclosed herein.

[0201] The one or more processors 102, 202 may also be referred to as controllers, microcontrollers, microprocessors, or microcomputers. The one or more processors 102, 202 may be implemented using hardware, firmware, software, or a combination thereof. As an example, the one or more processors 102, 202 may include 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). The descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein may be implemented using firmware or software, and the firmware or software may be implemented to include modules, procedures, functions, and the like. The firmware or software configured to perform the descriptions, functions, procedures, suggestions, methods, and / or flowcharts disclosed herein may be included in the one or more processors 102, 202, or may be stored in one or more memories 104, 204 and run by the one or more processors 102, 202. The descriptions, functions, procedures, suggestions, methods and / or flow charts disclosed in this specification may be embodied using firmware or software in the form of code, instructions and / or sets of instructions.

[0202] The one or more memories 104, 204 may be coupled to the one or more processors 102, 202 and may store various forms of data, signals, messages, information, programs, code, instructions, and / or commands. The one or more memories 104, 204 may be comprised of 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 internal and / or external 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 techniques, such as wired or wireless connections.

[0203] One or more transceivers 106, 206 may transmit user data, control information, wireless signals / channels, etc., as described in the methods and / or flow charts, etc., herein to one or more other devices. One or more transceivers 106, 206 may receive user data, control information, wireless signals / channels, etc., as described in the descriptions, functions, procedures, suggestions, methods and / or flow charts, etc., disclosed herein from one or more other devices. For example, one or more transceivers 106, 206 may be coupled to one or more processors 102, 202 and may transmit and receive wireless signals. For example, one or more processors 102, 202 may control one or more transceivers 106, 206 to transmit user data, control information, or wireless signals to one or more other devices. Also, 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. Also, the one or more transceivers 106, 206 are coupled to one or more antennas 108, 208, and the one or more transceivers 106, 206 are configured to transmit and receive user data, control information, radio signals / channels, etc., as referred to in the descriptions, functions, procedures, suggestions, methods and / or flow charts disclosed herein, via the one or more antennas 108, 208. In this specification, the one or more antennas are multiple physical antennas or multiple logical antennas (e.g., antenna ports). The one or more transceivers 106, 206 convert the received user data, control information, radio signals / channels, etc., from RF band signals to baseband signals for processing using the one or more processors 102, 202. The one or more transceivers 106, 206 convert the user data, control information, radio signals / channels, etc., processed using the one or more processors 102, 202, from baseband signals to RF band signals. For this purpose, the one or more transceivers 106, 206 include (analog) oscillators and / or filters.

[0204] 14 shows another example of a wireless device to which the present invention is applied. The wireless device may be embodied in various forms depending on the use case / service (see FIG. 12).

[0205] Referring to Fig. 14, the wireless devices 100, 200 correspond to the wireless devices 100, 200 of Fig. 13 and are composed of various elements, components, units and / or modules. For example, the wireless devices 100, 200 include a communication unit 110, a control unit 120, a memory unit 130 and an additional element 140. The communication unit includes a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 includes one or more processors 102, 202 and / or one or more memories 104, 204 in Fig. 13. For example, the transceiver 114 includes one or more transceivers 106, 206 and / or one or more antennas 108, 208 in Fig. 13. The control unit 120 is electrically connected to the communication unit 110, the memory unit 130 and the additional element 140 and controls the overall operation of the wireless device. For example, the control unit 120 controls electrical / mechanical operations of the wireless device based on the programs / codes / commands / information stored in the memory unit 130. In addition, the control unit 120 transmits information stored in the memory unit 130 to the outside (e.g., another communication device) via the communication unit 110 through a wireless / wired interface, or stores information received from the outside (e.g., another communication device) via the communication unit 110 through a wireless / wired interface in the memory unit 130.

[0206] The additional element 140 may be configured in various ways depending on the type of wireless device. For example, the additional element 140 may include any one of a power unit / battery, an input / output unit (I / O unit), a driving unit, and a computer unit. The wireless device may be embodied in the form of, but is not limited to, a robot (FIG. 12, 100a), a vehicle (FIG. 12, 100b-1, 100b-2), an XR device (FIG. 12, 100c), a mobile device (FIG. 12, 100d), a home appliance (FIG. 12, 100e), an IoT device (FIG. 12, 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 / environment device, an AI server / device (FIG. 12, 400), a base station (FIG. 12, 200), and a network node. The wireless device may be mobile or fixed depending on the use case / service.

[0207] In Fig. 14, various elements, components, units / parts and / or modules in the wireless devices 100 and 200 are entirely connected to each other by a wired interface, or at least some of them are wirelessly connected by the communication unit 110. For example, in the wireless devices 100 and 200, the control unit 120 and the communication unit 110 are wired connected, and the control unit 120 and a first unit (e.g., 130, 140) are wirelessly connected by the communication unit 110. Also, each element, component, unit / part and / or module in the wireless devices 100 and 200 further includes one or more elements. For example, the control unit 120 is configured with a set of one or more processors. For example, the control unit 120 is configured with a set of a communication control processor, an application processor, an ECU (Electronic Control Unit), a graphics processor, a memory control processor, etc. As another example, the memory unit 130 may be composed of a Random Access Memory (RAM), a Dynamic RAM (DRAM), a Read Only Memory (ROM), a flash memory, a volatile memory, a non-volatile memory, and / or a combination thereof.

[0208] 15 is a diagram illustrating a vehicle or an autonomous vehicle to which the present invention is applied. The vehicle or the autonomous vehicle may be realized as a mobile robot, a car, a train, an aerial vehicle (AV), a ship, or the like.

[0209] 15, a vehicle or autonomous vehicle 100 includes an antenna unit 108, a communication unit 110, a control unit 120, a drive unit 140a, a power supply unit 140b, a sensor unit 140c, and an autonomous driving unit 140d. The antenna unit 108 is configured as a part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to blocks 110 / 130 / 140 in FIG. 14, respectively.

[0210] The communication unit 110 transmits and receives signals (e.g., data, control signals, etc.) to and from external devices such as other vehicles, base stations (e.g., base stations, road side units, etc.), and servers. The control unit 120 controls elements of the vehicle or autonomous vehicle 100 to perform various operations. The control unit 120 includes an ECU (Electronic Control Unit). The driving unit 140a enables the vehicle or autonomous vehicle 100 to run on the ground. The driving unit 140a includes an engine, a motor, a powertrain, wheels, brakes, a steering device, etc. The power supply unit 140b supplies power to the vehicle or autonomous vehicle 100 and includes wired / wireless charging circuits, a battery, etc. The sensor unit 140c can obtain vehicle status, surrounding environment information, user information, etc. The sensor unit 140c includes an IMU (inertial measurement unit) sensor, a collision sensor, a wheel sensor, a speed sensor, a tilt sensor, a weight sensor, a heading sensor, a position module, a vehicle forward / reverse 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 embodies a technology for maintaining a lane while driving, a technology for automatically adjusting speed such as an adaptive cruise control, a technology for automatically driving according to a predetermined route, a technology for automatically setting a route when a destination is set, and the like.

[0211] For example, the communication unit 110 receives map data, traffic information data, etc. from an external server. The autonomous driving unit 140d generates an autonomous driving route and a drive plan based on the obtained data. The control unit 120 controls the driving unit 140a (e.g., speed / direction adjustment) so that the vehicle or autonomous driving vehicle 100 moves along the autonomous driving route according to the drive plan. The communication unit 110 non-periodically obtains the latest traffic information data from an external server during autonomous driving, and also obtains surrounding traffic information data from surrounding vehicles. In addition, the sensor unit 140c obtains vehicle status and surrounding environment information during autonomous driving. The autonomous driving unit 140d updates the autonomous driving route and the drive plan based on the newly obtained data / information. The communication unit 110 transmits information regarding the vehicle position, the autonomous driving route, the drive plan, etc. to the external server. The external server can predict traffic information data in advance using AI technology, etc. based on information collected from the vehicle or autonomous driving vehicle, and provide the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0212] FIG. 16 is a diagram for explaining a DRX (Discontinuous Reception) operation of a terminal according to one embodiment of the present invention.

[0213] A terminal can perform DRX operation while executing the procedures and / or methods described / proposed above. A terminal configured for DRX can reduce power consumption by discontinuously receiving DL signals. DRX is performed in RRC (Radio Resource Control)_IDLE state, RRC_INACTIVE state, and RRC_CONNECTED state. DRX in the RRC_IDLE state and RRC_INACTIVE state is used to discontinuously receive paging signals. DRX performed in the RRC_CONNECTED state will be described below (RRC_CONNECTED DRX).

[0214] Referring to FIG. 16, the DRX cycle consists of On Duration and Opportunity for DRX. The DRX cycle defines a time interval in which On Duration is repeated periodically. On Duration indicates a time period in which the terminal monitors to receive the PDCCH. When DRX is configured, the terminal performs PDCCH monitoring during On Duration. If there is a successfully detected PDCCH during PDCCH monitoring, the terminal operates an inactivity timer and maintains an awake state. On the other hand, if there is no successfully detected PDCCH during PDCCH monitoring, the terminal enters a sleep state after the On Duration ends. Thus, when DRX is configured, PDCCH monitoring / reception is performed discontinuously in the time domain when performing the above-described / proposed procedure and / or method. For example, when DRX is configured, in the present invention, PDCCH reception opportunities (e.g., slots having a PDCCH search space) are set discontinuously according to the DRX configuration. On the other hand, when DRX is not configured, PDCCH monitoring / reception is performed continuously in the time domain when performing the above / proposed procedures and / or methods. For example, when DRX is not configured, in the present invention, PDCCH reception opportunities (e.g., slots having PDCCH search space) are configured continuously. On the other hand, regardless of whether DRX is configured, PDCCH monitoring may be restricted in the time period configured in the measurement gap.

[0215] Table 8 shows the process of the terminal related to DRX (RRC_CONNECTED state). Referring to Table 13, DRX configuration information is received via higher layer (e.g., RRC) signaling, and DRX ON / OFF is controlled by a DRX command of the MAC layer. If DRX is configured, the terminal can perform PDCCH monitoring discontinuously when performing the procedures and / or methods described / proposed in the present invention.

[0216] [Table 8]

[0217] Here, MAC-CellGroupConfig includes configuration information required to set MAC (Medium Access Control) parameters for a cell group. MAC-CellGroupConfig may include configuration information related to DRX. For example, MAC-CellGroupConfig includes the following information in the definition of DRX:

[0218] - Value of drx-OnDurationTimer: defines the length of the start period of the DRX cycle

[0219] - Value of drx-InactivityTimer: defines the length of the time interval in which the UE is in an awake state after a PDCCH opportunity in which a PDCCH indicating initial UL or DL ​​data is detected

[0220] - Value of drx-HARQ-RTT-TimerDL: defines the length of the maximum time interval after a DL initial transmission is received until a DL retransmission is received.

[0221] - Value of drx-HARQ-RTT-TimerDL: defines the length of the maximum time interval between when a grant for a UL initial transmission is received and when a grant for a UL retransmission is received.

[0222] - drx-LongCycleStartOffset: defines the length and start time of a DRX cycle

[0223] - drx-ShortCycle(optional): defines the time length of a short DRX cycle

[0224] Here, if any one of the drx-OnDurationTimer, drx-InactivityTimer, drx-HARQ-RTT-TimerDL, and drx-HARQ-RTT-TimerDL is operating, the terminal maintains an active state and performs PDCCH monitoring at every PDCCH opportunity.

[0225] The above-described embodiments are combinations of the components and features of the present invention in a predetermined form. Each component or feature should be considered as optional unless otherwise expressly stated. Each component or feature may be implemented in a form not combined with other components or features. It is also possible to combine some components and / or features to configure an embodiment of the present invention. The order of each operation described in the embodiments of the present invention may be changed. Some configurations or features of any embodiment may be included in other embodiments, or may be replaced with corresponding configurations or features of other embodiments. It is obvious that claims that are not explicitly cited in the claims may be combined to configure an embodiment, or may be included as a new claim by amendment after filing.

[0226] It is obvious to those skilled in the art that the present invention can be embodied in other specific forms without departing from the characteristics of the present invention. Therefore, the above detailed description should not be interpreted as limiting in all respects, but should be considered as illustrative. The scope of the present invention should be determined by reasonable interpretation of the appended claims, and all modifications within the equivalent scope of the present invention are included in the scope of the present invention. [Industrial Applicability]

[0227] The present invention can be used in a terminal, a base station or other equipment of a wireless mobile communication system.

Claims

1. A method for a terminal (UE) receiving a signal in a wireless communication system, comprising: receiving configuration information for a transmission configuration indication (TCI) via higher layer signaling; Receiving downlink control information (DCI) including one TCI field via a physical downlink control channel (PDCCH) signal; The terminal obtains TCI state information for at least some of the signals based on the TCI field; The plurality of signals includes a first set of signals including a first physical downlink shared channel (PDSCH) signal and a second set of signals including a second PDSCH signal; 11. The method of claim 10, wherein at least one of a plurality of codepoints for the TCI field is mapped to a combination of first TCI status information for a first set of signals that includes the first PDSCH signal and second TCI status information for a second set of signals that includes the second PDSCH signal.

2. The first TCI status information is first joint TCI status information obtained by combining a first downlink (DL) TCI for a first DL signal and a first uplink (UL) TCI for a first UL signal among the first set of signals; 2. The method of claim 1, wherein the second TCI status information is second joint TCI status information combining a second DL TCI for a second DL signal and a second UL TCI for a second UL signal of the second set of signals.

3. The first TCI status information indicates at least one of a first downlink (DL) TCI for a first DL signal or a first uplink (UL) TCI that is separate from the first DL TCI and is a UL TCI for a first UL signal of the first set of signals; 2. The method of claim 1, wherein the second TCI status information indicates at least one of a second DL TCI for a second DL signal or a second UL TCI that is distinct from the second DL TCI and is a UL TCI for a second UL signal in the second set of signals.

4. The first set of signals includes at least one of a first PDCCH signal, a first channel state information-reference signal (CSI-RS), a first physical uplink shared channel (PUSCH) signal, a first physical uplink control channel (PUCCH) signal, and a first sounding reference signal (SRS) on a first control resource set (CORESET); 2. The method of claim 1, wherein the second set of signals includes at least one of a second PDCCH signal, a second CSI-RS, a second PUSCH signal, a second PUCCH signal, and a second SRS on a second CORESET.

5. 2. The method of claim 1, wherein first subset information for at least some of the signals in the first set to which the first TCI status information applies, and second subset information for at least some of the signals in the second set to which the second TCI status information applies, are configured in the terminal via higher layer signaling.

6. applying first quasi-co location (QCL) information commonly to the first set of signals based on the first TCI status information; The method of claim 1 , further comprising applying second QCL information commonly to the second set of signals based on the second TCI status information.

7. The method of claim 1 , wherein the DCI has a DL-grant DCI format for downlink (DL) scheduling.

8. 2. The method of claim 1, wherein at least one code point mapped to a combination of the first TCI status information and the second TCI status information is associated with a multi-transmission reception point (TRP) operation.

9. 2. The method of claim 1, further comprising transmitting or receiving at least one of the first set of signals based on the first TCI status information and the second set of signals based on the second TCI status information.

10. A computer-readable recording medium having a program recorded thereon for carrying out the method according to claim 1.

11. A device for wireless communication, comprising: A memory for storing instruction words; A processor that operates by executing the instructions; The operation of the processor includes: receiving configuration information for a transmission configuration indication (TCI) via higher layer signaling; Receiving downlink control information (DCI) including one TCI field via a physical downlink control channel (PDCCH) signal; The processor obtains TCI state information for at least some of the signals based on the TCI field; The plurality of signals includes a first set of signals including a first physical downlink shared channel (PDSCH) signal and a second set of signals including a second PDSCH signal; at least one of a plurality of codepoints for the TCI field is mapped to a combination of first TCI status information for a first set of signals that includes the first PDSCH signal and second TCI status information for a second set of signals that includes the second PDSCH signal.

12. a transceiver for transmitting or receiving wireless signals under the control of said processor; The device of claim 11, wherein the device is a terminal (UE) in a wireless communication system.

13. The device according to claim 11, wherein the device is an application specific integrated circuit (ASIC) or a digital signal processing device for controlling a terminal (UE).

14. 1. A method for a base station to transmit a signal in a wireless communication system, comprising: Transmitting configuration information for a transmission configuration indication (TCI) to a terminal (UE) via higher layer signaling; Transmitting a downlink control information (DCI) including one TCI field to the terminal via a physical downlink control channel (PDCCH) signal; The base station indicates, to the terminal, TCI state information for at least some of the signals based on the TCI field; The plurality of signals includes a first set of signals including a first physical downlink shared channel (PDSCH) signal and a second set of signals including a second PDSCH signal; 11. The method of claim 10, wherein at least one of a plurality of codepoints for the TCI field is mapped to a combination of first TCI status information for a first set of signals that includes the first PDSCH signal and second TCI status information for a second set of signals that includes the second PDSCH signal.

15. 1. A base station for wireless communication, comprising: A transceiver; A processor for controlling the transceiver to transmit configuration information for a transmission configuration indication (TCI) to a terminal (UE) through higher layer signaling and to transmit downlink control information (DCI) including one TCI field to the terminal through a physical downlink control channel (PDCCH) signal, The processor indicates, to the terminal, TCI state information for at least some of the signals based on the TCI field; The plurality of signals includes a first set of signals including a first physical downlink shared channel (PDSCH) signal and a second set of signals including a second PDSCH signal; At least one of a plurality of codepoints for the TCI field is mapped to a combination of first TCI status information for a first set of signals including the first PDSCH signal and second TCI status information for a second set of signals including the second PDSCH signal.

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