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

Abstract

A terminal according to at least one embodiment disclosed in the present specification may: receive configuration information on a TCI through high layer signaling; receiving DCI (Downlink Control Information) including one TCI field through the PDCCH signal; and obtaining, based on the TCI field, TCI state information of at least a portion of the plurality of signals, where the plurality of signals may include a first signal set including a first PDSCH signal and a second signal set including a second PDSCH signal, and at least one code point of the plurality of code points of the TCI field may be mapped to a combination of first TCI state information of a first signal set including the first PDSCH signal and second TCI state information of a second signal set including the second PDSCH.

Description

Technical Field

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

[0002] In general, wireless communication systems are developing to cover a wide range in various ways to provide communication services such as audio communication services, data communication services, etc. Wireless communication is a multiple access system that can support communication with multiple users by sharing available system resources (e.g., bandwidth, transmission power, etc.). For example, the multiple access system can be any of a code division multiple access (CDMA) system, a frequency division multiple access (FDMA) system, a time division multiple access (TDMA) system, an orthogonal frequency division multiple access (OFDMA) system, and a single carrier frequency division multiple access (SC-FDMA) system. Summary of the invention

[0003] Technical issues

[0004] An object of the present disclosure is to provide a method and apparatus for efficiently performing a wireless signal transmission / reception process.

[0005] Those skilled in the art will understand that the objectives that can be achieved using the present disclosure are not limited to those specifically described above, and the above and other objectives that can be achieved by the present disclosure will be more clearly understood from the following detailed description.

[0006] Technical Solution

[0007] In one aspect of the present disclosure, a method for receiving a signal by a user equipment (UE) in a wireless communication system is provided herein. The method may include the following steps: receiving configuration information about a transmission configuration indication (TCI) through high-layer signaling; and receiving downlink control information (DCI) including a TCI field through a physical downlink control channel (PDCCH) signal. The UE may obtain TCI state information about at least part of a plurality of signals based on the TCI field. The plurality of signals may include: a first signal set including a first physical downlink shared channel (PDSCH) signal; and a second signal set including a second PDSCH signal. At least one of the plurality of code points of the TCI field may be mapped to a combination of first TCI state information about a first signal set including a first PDSCH signal and second TCI state information about a second signal set including a second PDSCH signal.

[0008] For example, the first TCI status information may be first joint TCI status information which is a combination of a first downlink (DL) TCI of a first DL signal in the first signal set and a first uplink (UL) TCI of a first UL signal in the first signal set, and the second TCI status information may be second joint TCI status information which is a combination of a second DLTCI of a second DL signal in the second signal set and a second UL TCI of a second UL signal in the second signal set.

[0009] For example, the first TCI state information may indicate at least one of a first DL TCI of a first DL signal in the first signal set or a first UL TCI of a first UL signal in the first signal set, wherein the first DL TCI is separated from the first UL TCI, and the second TCI state information may indicate at least one of a second DL TCI of a second DL signal in the second signal set or a second UL TCI of a second UL signal in the second signal set, wherein the second DL TCI is separated from the second UL TCI.

[0010] The first signal set may include 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, or a first sounding reference signal (SRS) on a first control resource set (CORESET), and the second signal set may include at least one of a second PDCCH signal, a second CSI-RS, a second PUSCH signal, a second PUCCH signal, or a second SRS on a second CORESET.

[0011] The UE may be configured with first subset information about at least part of the signals in the first signal set to which the first TCI state information is to be applied and second subset information about at least part of the signals in the second signal set to which the second TCI state information is to be applied through high-layer signaling.

[0012] The first quasi-coordinate (QCL) information may be commonly applied to the first signal set based on the first TCI state information, and the second QCL information may be commonly applied to the second signal set based on the second TCI state information.

[0013] The DCI may have a DL grant DCI format for DL ​​scheduling.

[0014] At least one code point mapped to the combination of the first TCI state information and the second TCI state information may be related to a multiple transmission / reception point (M-TRP) operation.

[0015] The UE may send or receive at least one of a first signal set based on the first TCI state information and a second signal set based on the second TCI state information.

[0016] In another aspect of the present disclosure, a processor-readable recording medium having recorded thereon a program for executing the above-mentioned signal receiving method is provided herein.

[0017] In another aspect of the present disclosure, a UE configured to perform the above signal receiving method is provided herein.

[0018] In another aspect of the present disclosure, a device configured to control a UE to perform the above-mentioned signal receiving method is provided herein.

[0019] In another aspect of the present disclosure, a method for sending a signal by a base station (BS) in a wireless communication system is provided herein. The method may include the following steps: sending configuration information about TCI to a UE through high-layer signaling; and sending a DCI including a TCI field to the UE through a PDCCH signal. The BS may provide the UE with TCI status information about at least some of the multiple signals based on the TCI field. The multiple signals may include: a first signal set including a first PDSCH signal; and a second signal set including a second PDSCH signal. At least one of the multiple code points of the TCI field may be mapped to a combination of first TCI status information about a first signal set including a first PDSCH signal and second TCI status information about a second signal set including a second PDSCH signal.

[0020] In another aspect of the present disclosure, a BS configured to perform the above-mentioned signal transmission method is provided herein.

[0021] Beneficial Effects

[0022] According to the present disclosure, wireless signal transmission and reception can be efficiently performed in a wireless communication system.

[0023] Those skilled in the art will appreciate that the effects that can be achieved using the present disclosure are not limited to those specifically described above, and other advantages of the present disclosure will be more clearly understood from the following detailed description in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Physical channels used in a 3rd Generation Partnership Project (3GPP) system as an exemplary wireless communication system and a general signal transmission method using the same are shown.

[0025] Figure 2 Shows the radio frame structure.

[0026] Figure 3 A resource grid showing time slots.

[0027] Figure 4 An exemplary mapping of physical channels in time slots is shown.

[0028] Figure 5 An exemplary PDSCH and acknowledgement / negative acknowledgement (ACK / NACK) transmission process is shown.

[0029] Figure 6 An exemplary PUSCH transmission process is shown.

[0030] Figure 7 An example of a channel state information (CSI) related process is shown.

[0031] Figure 8 is a diagram for explaining the concept of a unified transmission configuration indication (TCI) framework.

[0032] Fig. 9 It is a diagram used to illustrate the concept of extending the unified TCI framework.

[0033] Fig.10 An implementation example of a method in which a user equipment (UE) receives a signal (eg, a physical downlink control channel (PDCCH)) in a wireless communication system according to an embodiment is shown.

[0034] Fig.11 An implementation example of a method in which a base station (BS) transmits a signal (eg, PDCCH) in a wireless communication system according to an embodiment is shown.

[0035] Figures 12 to 15 A communication system 1 and a wireless device suitable for use with the present disclosure are shown.

[0036] Fig.16 A discontinuous reception (DRX) operation suitable for the present disclosure is shown. DETAILED DESCRIPTION

[0037] Embodiments of the present disclosure are applicable to various wireless access technologies such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), and single carrier frequency division multiple access (SC-FDMA). CDMA can be implemented as a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000. TDMA can be implemented as a radio technology such as Global System for Mobile Communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE). OFDMA can be implemented as a radio technology such as Institute of Electrical and Electronics Engineers (IEEE) 802.11 (Wireless Fidelity (Wi-Fi)), IEEE 802.16 (Worldwide Interoperability for Microwave Access (WiMAX)), IEEE 802.20, and Evolved UTRA (E-UTRA). UTRA is part of Universal Mobile Telecommunications System (UMTS). 3rd Generation Partnership Project (3GPP) Long Term Evolution (LTE) is a part of Evolved UMTS (E-UMTS) using E-UTRA, and LTE-Advanced (A) is an evolved version of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is an evolved version of 3GPP LTE / LTE-A.

[0038] As more and more communication devices require greater communication capacity, enhanced mobile broadband communications relative to traditional radio access technologies (RATs) are needed. In addition, large-scale machine-type communications (MTC), which can provide various services anytime and anywhere by connecting multiple devices and objects, is another important issue to be considered for next-generation communications. Discussions are also underway to design communication systems that take into account services / UEs that are sensitive to reliability and latency. Therefore, discussions are underway to introduce new radio access technologies that take into account enhanced mobile broadband communications (eMBB), massive MTC, and ultra-reliable low-latency communications (URLLC). In this disclosure, for simplicity, this technology will be referred to as NR (new radio or new RAT).

[0039] For the sake of brevity, 3GPP NR is mainly described, but the technical concept of the present disclosure is not limited thereto.

[0040] In the present disclosure, the term "setting" may be replaced by "configuration", and the two may be used interchangeably. In addition, conditional expressions (e.g., "if", "in the case of..." or "when") may be replaced by "based on..." or "under the state of...". In addition, the operation or software / hardware (SW / HW) configuration of the user equipment (UE) / base station (BS) may be derived / understood based on satisfying the corresponding conditions. When the processing of the receiving (or transmitting) side can be derived / understood from the processing of the transmitting (or receiving) side in the signal transmission / reception between the wireless communication device (e.g., BS and UE), its description may be omitted. For example, the signal determination / generation / encoding / transmission of the transmitting side may be understood as the signal monitoring reception / decoding / determination of the receiving side. In addition, when it is said that the UE performs (or does not perform) a specific operation, this may also be interpreted as the BS expecting / assuming (or not expecting / assuming) that the UE performs the specific operation. When it is said that the BS performs (or does not perform) a specific operation, this may also be interpreted as the UE expecting / assuming (or not expecting / assuming) that the BS performs the specific operation. In the following description, for the convenience of description, sections, implementations, examples, options, methods, schemes, etc. are distinguished and indexed from each other, which does not mean that each of them necessarily constitutes an independent invention or that each of them should only be implemented separately. Unless explicitly contradicted, it can be deduced / understood that at least some sections, implementations, examples, options, methods, schemes, etc. can be implemented in combination or can be omitted.

[0041] In a wireless communication system, a user equipment (UE) receives information from a base station (BS) through a downlink (DL) and transmits information to the BS through an uplink (UL). The information transmitted and received by the BS and the UE includes data and various control information, and includes various physical channels according to the type / purpose of the information transmitted and received by the UE and the BS.

[0042] Figure 1 Physical channels used in the 3GPP NR system and a general signal transmission method using the same are shown.

[0043] When the UE is powered on again from a power-off state or enters a new cell, in step S101, the UE performs an initial cell search process (e.g., establishes synchronization with the BS). To this end, the UE receives a synchronization signal block (SSB) from the BS. The SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). The UE establishes synchronization with the BS based on the PSS / SSS and obtains information such as a cell identity (ID). The UE can obtain broadcast information in the cell based on the PBCH. The UE can receive a DL reference signal (RS) during the initial cell search process to monitor the DL channel status.

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

[0045] The UE may perform a random access procedure to access the BS in steps S103 to S106. For random access, the UE may send a preamble to the BS on a physical random access channel (PRACH) (S103) and receive a response message to the preamble on a PDCCH and a PDSCH corresponding to the PDCCH (S104). In the case of contention-based random access, the UE may perform a contention resolution procedure by further sending a PRACH (S105) and receiving a PDCCH and a PDSCH corresponding to the PDCCH (S106).

[0046] After the foregoing process, the UE may receive PDCCH / PDSCH (S107) and send a physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) (S108) as a general downlink / uplink signal transmission process. The control information sent from the UE to the BS is called uplink control information (UCI). UCI includes hybrid automatic repeat and request confirmation / negative determination (HARQ-ACK / NACK), scheduling request (SR), channel state information (CSI), etc. CSI includes channel quality indicator (CQI), precoding matrix indicator (PMI), rank indicator (RI), etc. Although UCI is usually sent on PUCCH, UCI may be sent on PUSCH when control information and business data need to be sent simultaneously. In addition, UCI may be sent aperiodically via PUSCH according to the request / command of the network.

[0047] Figure 2 The radio frame structure is shown. In NR, uplink transmission and downlink transmission are configured in frames. Each radio frame has a length of 10ms and is divided into two 5ms half frames (HF). Each half frame is divided into five 1ms subframes (SF). A subframe is divided into one or more time slots, and the number of time slots in a subframe depends on the subcarrier spacing (SCS). Depending on the cyclic prefix (CP), each time slot includes 12 or 14 orthogonal frequency division multiplexing (OFDM) symbols. When a normal CP is used, each time slot includes 14 OFDM symbols. When an extended CP is used, each time slot includes 12 OFDM symbols.

[0048] Table 1 exemplarily shows that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to the SCS when a normal CP is used.

[0049] [Table 1]

[0050] <![CDATA[SCS(15*2 u )]]> <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot ]]> 15KHz(u=0) 14 10 1 30KHz(u=1) 14 20 2 60KHz(u=2) 14 40 4 120KHz(u=3) 14 80 8 240KHz(u=4) 14 160 16

[0051] *N slot symb : The number of symbols in a time slot

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

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

[0054] Table 2 shows that the number of symbols per slot, the number of slots per frame, and the number of slots per subframe vary according to the SCS when the extended CP is used.

[0055] [Table 2]

[0056] <![CDATA[SCS(15*2 u )]]> <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot ]]> 60KHz(u=2) 12 40 4

[0057] The structure of the frame is only an example. The number of subframes, the number of time slots, and the number of symbols in a frame may vary.

[0058] In the NR system, OFDM parameter sets (e.g., SCS) may be configured differently for multiple cells aggregated for one UE. Therefore, the (absolute time) duration of a time resource (e.g., SF, time slot, or TTI) (referred to as a time unit (TU) for simplicity) consisting of the same number of symbols may be configured differently between aggregated cells. Here, the symbol may include an OFDM symbol (or CP-OFDM symbol) and an SC-FDMA symbol (or a discrete Fourier transform-spread-OFDM (DFT-s-OFDM) symbol).

[0059] Figure 3 A resource grid showing a time slot. A time slot includes multiple symbols in the time domain. For example, when a normal CP is used, a time slot includes 14 symbols. However, when an extended CP is used, a time slot includes 12 symbols. A carrier includes multiple subcarriers in the frequency domain. A resource block (RB) is defined as a plurality of consecutive subcarriers (e.g., 12 consecutive subcarriers) in the frequency domain. A bandwidth part (BWP) may be defined as a plurality of consecutive physical RBs (PRBs) in the frequency domain and corresponds to a single parameter set (e.g., SCS, CP length, etc.). A carrier may include up to N (e.g., five) BWPs. Data communication may be performed via enabled BWPs, and only one BWP may be enabled for a UE. In a resource grid, each element is referred to as a resource element (RE), and a complex symbol may be mapped to each RE.

[0060] Figure 4An exemplary mapping of physical channels in a time slot is shown. PDCCH may be sent in the DL control region, and PDSCH may be sent in the DL data region. PUCCH may be sent in the UL control region, and PUSCH may be sent in the UL data region. A guard period (GP) provides a time gap for a transmission mode to a reception mode switch or a reception mode to a transmission mode switch at the BS and the UE. Some symbols in a subframe at the time of a DL to UL switch may be configured as a GP.

[0061] The individual physical channels are described in more detail below.

[0062] PDCCH transmits DCI. For example, PDCCH (i.e., DCI) may carry information about the transmission format and resource allocation of the DL shared channel (DL-SCH), resource allocation information of the uplink shared channel (UL-SCH), paging information about the paging channel (PCH), system information about DL-SCH, information about resource allocation of high-level control messages (e.g., RAR sent on PDSCH), transmit power control commands, information about the activation / release of the configured scheduling, etc. DCI includes a cyclic redundancy check (CRC). The CRC is masked using various identifiers (IDs) (e.g., radio network temporary identifier (RNTI)) according to the owner or purpose of the PDCCH. For example, if the PDCCH is used for a specific UE, the CRC is masked by the UE ID (e.g., cell-RNTI (C-RNTI)). If the PDCCH is used for a paging message, the CRC is masked by the paging-RNTI (P-RNTI). If the PDCCH is for system information (eg, system information block (SIB)), the CRC is masked by a system information RNTI (SI-RNTI). When the PDCCH is for RAR, the CRC is masked by a random access-RNTI (RA-RNTI).

[0063] The PDCCH includes 1, 2, 4, 8 or 16 control channel elements (CCEs) depending on its aggregation level (AL). CCE is a logical allocation unit for providing a specific code rate to the PDCCH according to the radio channel state. CCE includes 6 resource element groups (REGs), each REG being defined by one OFDM symbol × one (P)RB. The PDCCH is transmitted in a control resource set (CORESET). A CORESET is defined as a set of REGs with a given set of parameters (e.g., SCS, CP length, etc.). Multiple CORESETs for one UE may overlap with each other in the time / frequency domain. The CORESET may be configured by system information (e.g., master information block (MIB)) or UE-specific high-level signaling (e.g., radio resource control (RRC) signaling). Specifically, the number of RBs and the number of symbols (up to 3) in a CORESET may be configured by high-level signaling.

[0064] For PDCCH reception / detection, the UE monitors PDCCH candidates. PDCCH candidates are CCEs that the UE should monitor to detect PDCCH. Each PDCCH candidate is defined as 1, 2, 4, 8 or 16 CCEs according to the AL. Monitoring includes (blind) decoding of the PDCCH candidates. The set of PDCCH candidates decoded by the UE is defined as the PDCCH search space (SS). The SS can be a common search space (CSS) or a UE-specific search space (USS). The UE can obtain DCI by monitoring PDCCH candidates in one or more SSs configured by MIB or high-level signaling. Each CORESET is associated with one or more SSs, and each SS is associated with a CORESET. The SS can be defined based on the following parameters.

[0065] -controlResourceSetId: CORESET related to SS.

[0066] -monitoringSlotPeriodicityAndOffset: PDCCH monitoring periodicity (time slot) and PDCCH monitoring offset (time slot).

[0067] - monitoringSymbolsWithinSlot: PDCCH monitoring symbols in a slot (eg, the first symbol of a CORESET).

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

[0069] *The timing (eg, time / frequency resources) at which the UE is to monitor a PDCCH candidate is defined as a PDCCH (monitoring) timing. One or more PDCCH (monitoring) timings may be configured in a time slot.

[0070] Table 3 shows the characteristics of each SS.

[0071] [Table 3]

[0072]

[0073] Table 4 shows the DCI format transmitted on the PDCCH.

[0074] [Table 4]

[0075]

[0076] DCI format 0_0 can be used to schedule TB-based (or TB-level) PUSCH, and DCI format 0_1 ​​can be used to schedule TB-based (or TB-level) PUSCH or code block group (CBG)-based (or CBG-level) PUSCH. DCI format 1_0 can be used to schedule TB-based (or TB-level) PDSCH, and DCI format 1_1 can be used to schedule TB-based (or TB-level) PDSCH or CBG-based (or CBG-level) PDSCH (or DL ​​grant DCI). DCI format 0_0 / 0_1 can be called UL grant DCI or UL scheduling information, and DCI format 1_0 / 1_1 can be called DL grant DCI or DL ​​scheduling information. DCI format 2_0 is used to transmit dynamic slot format information (e.g., dynamic slot format indicator (SFI)) to the UE, and DCI format 2_1 is used to transmit DL preemption information to the UE. DCI format 2_0 and / or DCI format 2_1 can be transmitted to a corresponding group of UEs on a group common PDCCH (a PDCCH pointing to a group of UEs).

[0077] DCI format 0_0 and DCI format 1_0 may be referred to as fallback DCI formats, while DCI format 0_1 ​​and DCI format 1_1 may be referred to as non-fallback DCI formats. Under the fallback DCI format, the DCI size / field configuration remains the same regardless of the UE configuration. In contrast, under the non-fallback DCI format, the DCI size / field configuration varies according to the UE configuration.

[0078] PDSCH transmits DL data (e.g., DL shared channel transport block (DL-SCH TB)) and uses modulation schemes such as quadrature phase shift keying (QPSK), 16-ary quadrature amplitude modulation (16QAM), 64QAM, or 256QAM. TB is encoded as a codeword. PDSCH can transmit up to two codewords. Scrambling and modulation mapping can be performed on the basis of the codeword, and the modulation symbols generated from each codeword can be mapped to one or more layers. Each layer is mapped to a resource together with a demodulation reference signal (DMRS), and an OFDM symbol signal is generated from the layer mapped with the DMRS and sent through the corresponding antenna port.

[0079] PUCCH transmits uplink control information (UCI). UCI includes the following information.

[0080] -SR (Scheduling Request): Information used to request UL-SCH resources.

[0081] -HARQ (Hybrid Automatic Repeat Request) -ACK (Acknowledgement): A response to a DL data packet (e.g., a codeword) on the PDSCH. HARQ-ACK indicates whether the DL data packet was successfully received. In response to a single codeword, a 1-bit HARQ-ACK may be sent. In response to two codewords, a 2-bit HARQ-ACK may be sent. HARQ-ACK responses include positive ACK (abbreviated as ACK), negative ACK (NACK), discontinuous transmission (DTX), or NACK / DTX. The term HARQ-ACK may be used interchangeably with HARQ ACK / NACK and ACK / NACK.

[0082] -CSI (Channel State Information): Feedback information of DL channels. Multiple Input Multiple Output (MIMO) related feedback information includes RI and PMI.

[0083] Table 5 shows an exemplary PUCCH format. Based on PUCCH transmission duration, the PUCCH format may be divided into short PUCCH (formats 0 and 2) and long PUCCH (formats 1, 3, and 4).

[0084] [Table 5]

[0085]

[0086] PUCCH format 0 transmits up to 2 bits of UCI and is mapped in a sequence-based manner for easy transmission. Specifically, the UE sends a specific UCI to the BS by sending one of multiple sequences on the PUCCH of PUCCH format 0. The UE sends the PUCCH of PUCCH format 0 in the PUCCH resources configured for the corresponding SR only when the UE sends a positive SR.

[0087] PUCCH format 1 transmits up to 2 bits of UCI, and the modulation symbol of UCI is spread in the time domain with an orthogonal cover code (OCC) (configured differently depending on whether frequency hopping is performed). DMRS is transmitted in symbols where modulation symbols are not transmitted (ie, transmitted in time division multiplexing (TDM)).

[0088] PUCCH format 2 transmits more than 2 bits of UCI, and the modulation symbols of DCI are sent with frequency division multiplexing (FDM) using DMRS. DMRS are located in symbols #1, #4, #7, and #10 of a given RB at a density of 1 / 3. Pseudo-noise (PN) sequences are used for DMRS sequences. For 2-symbol PUCCH format 2, frequency hopping can be enabled.

[0089] PUCCH format 3 does not support UE multiplexing in the same PRBS and transmits UCI of more than 2 bits. In other words, the PUCCH resource of PUCCH format 3 does not include OCC. The modulation symbol is transmitted in TDM using DMRS.

[0090] PUCCH format 4 supports multiplexing of up to 4 UEs in the same PRBS and transmits UCI of more than 2 bits. In other words, the PUCCH resource of PUCCH format 3 includes OCC. The modulation symbol is transmitted in TDM using DMRS.

[0091] At least one of the one or two or more cells configured to the UE may be configured for PUCCH transmission. At least the primary cell may be set as a cell for PUCCH transmission. Based on at least one cell configured for PUCCH transmission, at least one PUCCH cell group may be configured for the UE, and each PUCCH cell group includes one or two or more cells. The PUCCH cell group may be referred to as a PUCCH group. PUCCH transmission may be configured not only in the primary cell, but also in the secondary cell (Scell). The primary cell belongs to the primary PUCCH group, and the PUCCH-SCell configured for PUCCH transmission belongs to the secondary PUCCH group. For cells belonging to the primary PUCCH group, the PUCCH on the primary cell may be used. For cells belonging to the secondary PUCCH group, the PUCCH on the PUCCH-SCell may be used.

[0092] The PUSCH transmits UL data (e.g., UL shared channel transport block (UL-SCH TB)) and / or UCI based on a CP-OFDM waveform or a DFT-s-OFDM waveform. When the PUSCH is sent with a DFT-s-OFDM waveform, the UE sends the PUSCH with transform precoding. For example, when transform precoding is not possible (e.g., disabled), the UE may send the PUSCH with a CP-OFDM waveform, and when transform precoding is possible (e.g., enabled), the UE may send the PUSCH with a CP-OFDM or DFT-s-OFDM waveform. PUSCH transmission may be dynamically scheduled by a UL grant in the DCI, or semi-statically scheduled by higher layer (e.g., RRC) signaling (and / or layer 1 (L1) signaling such as PDCCH) (configured scheduling or configured grant). PUSCH transmission may be performed in a codebook-based or non-codebook-based manner.

[0093] Figure 5 An exemplary ACK / NACK transmission process is shown. Figure 5 , the UE may detect the PDCCH in slot #n. The PDCCH includes DL scheduling information (e.g., DCI format 1_0 or DCI format 1_1). The PDCCH indicates DL assignment with PDSCH offset K0 and PDSCH with HARQ-ACK report offset K1. For example, DCI format 1_0 and DCI format 1_1 may include the following information.

[0094] - Frequency domain resource assignment: indicates the RB set assigned to PDSCH.

[0095] - Time domain resource assignment: indicates K0 and the starting position (eg, OFDM symbol index) and length (eg, number of OFDM symbols) of the PDSCH in the slot.

[0096] -PDSCH-to-HARQ_feedback timing indicator: indicates K1.

[0097] -HARQ process number (4 bits): indicates the HARQ process ID of the data (eg, PDSCH or TB).

[0098] - PUCCH resource indicator (PRI): indicates a PUCCH resource to be used for UCI transmission among multiple PUCCH resources in a PUCCH resource set.

[0099] After receiving PDSCH in slot #(n+K0) according to the scheduling information of slot #n, the UE may send UCI on PUCCH in slot #(n+K1). UCI may include a HARQ-ACK response to PDSCH. For convenience, Figure 5Based on the assumption that the SCS of PDSCH is equal to the SCS of PUCCH and slot #n1=slot #(n+K0), this should not be construed as limiting the present disclosure. When the SCSs are different, K1 may be indicated / interpreted based on the SCS of PUCCH.

[0100] In the case where the PDSCH is configured to carry up to one TB, the HARQ-ACK response may be configured in one bit. In the case where the PDSCH is configured to carry up to two TBs, if spatial bundling is not configured, the HARQ-ACK response may be configured in two bits, and if spatial bundling is configured, the HARQ-ACK response may be configured in one bit. When slot #(n+K1) is designated as the HARQ-ACK transmission timing of multiple PDSCHs, the UCI sent in slot #(n+K1) includes HARQ-ACK responses to multiple PDSCHs.

[0101] Whether the UE should perform spatial bundling for HARQ-ACK responses may be configured for each cell group (e.g., via RRC / high-layer signaling). For example, spatial bundling may be configured for each individual HARQ-ACK response sent on the PUCCH and / or a HARQ-ACK response sent on the PUSCH.

[0102] Spatial bundling can be supported when up to two (or two or more) TBs (or codewords) can be received at a time (can be or be scheduled by one DCI) in the corresponding serving cell (for example, when the high-level parameter maxNrofCodeWordsScheduledByDCI indicates 2 TBs). More than four layers can be used for 2TB transmission, and up to four layers can be used for 1TB transmission. As a result, when spatial bundling is configured for the corresponding cell group, spatial bundling can be performed for serving cells in the cell group where more than four layers can be scheduled. A UE that wants to send a HARQ-ACK response through spatial bundling can generate a HARQ-ACK response by performing a (bit-by-bit) logical AND operation on the A / N bits of multiple TBs.

[0103] For example, assuming that a UE receives a DCI that schedules two TBs and receives the two TBs on a PDSCH based on the DCI, the UE that performs spatial bundling can generate a single A / N bit by a logical AND operation between a first A / N bit of a first TB and a second A / N bit of a second TB. As a result, when both the first TB and the second TB are ACK, the UE reports an ACK bit value to the BS, and when at least one TB is NACK, the UE reports a NACK bit value to the BS.

[0104] For example, when only one TB is actually scheduled in a serving cell configured to receive two TBs, the UE may generate a single A / N bit by performing a logical AND operation on the A / N bits of the one TB and a bit value 1. As a result, the UE reports the A / N bits of the one TB to the BS.

[0105] There are multiple parallel DL HARQ processes at the BS / UE for DL ​​transmissions. Multiple parallel HARQ processes allow continuous DL transmissions while the BS waits for HARQ feedback indicating the success or failure of reception of the 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 such as the number of MAC physical data unit (PDU) transmissions, HARQ feedback for the MAC PDUs in the buffer, and the current redundancy version. Each HARQ process is identified by a HARQ process ID.

[0106] Figure 6 An exemplary PUSCH transmission process is shown. Figure 6 , the UE may detect the PDCCH in slot #n. The PDCCH includes DL scheduling information (eg, DCI format 1_0 or 1_1). The DCI format 1_0 or 1_1 may include the following information.

[0107] - Frequency domain resource assignment: indicates the RB set assigned to PUSCH.

[0108] -Time domain resource assignment: Indicates the slot offset K2 and the starting position (e.g., OFDM symbol index) and duration (e.g., number of OFDM symbols) of the PUSCH in the slot. The starting symbol and length of the PUSCH may be indicated by a start and length indicator value (SLIV) or separately.

[0109] Then, the UE may transmit the PUSCH in slot #(n+K2) according to the scheduling information in slot #n. The PUSCH includes the UL-SCH TB.

[0110] CSI related operations

[0111] Figure 7 An example of a CSI-related process is shown.

[0112] The UE receives CSI-related configuration information from the BS via RRC signaling (710). The CSI-related configuration information may include at least one of channel state information-interference measurement (CSI-IM) related information, CSI measurement related information, CSI resource configuration related information, CSI-RS resource related information, or CSI report configuration related information.

[0113] -CSI-IM resources may be configured for interference measurement (IM) of the UE. In the time domain, the CSI-IM resource set may be configured as periodic, semi-persistent, or aperiodic. The CSI-IM resources may be configured as zero power (ZP)-CSI-RS of the UE. The ZP-CSI-RS may be configured to be distinguished from the non-zero power (NZP)-CSI-RS.

[0114] - The UE may assume that the CSI-RS resources for channel measurement and the CSI-IM / NZP CSI-RS resources for interference measurement configured for one CSI report have a QCL relationship with respect to the "QCL-TypeD" of each resource (when the NZP CSI-RS resources are used for interference measurement).

[0115] - The CSI resource configuration may include at least one of a CSI-IM resource for interference measurement, an NZP CSI-RS resource for interference measurement, and an NZP CSI-RS resource for channel measurement. The channel measurement resource (CMR) may be an NZP CSI-RS for CSI acquisition, and the interference measurement resource (IMR) may be an NZP CSI-RS for CSI-IM and IM.

[0116] -CSI-RS can be configured for one or more UEs. Different CSI-RS configurations can be provided for each UE, or the same CSI-RS configuration can be provided to multiple UEs. CSI-RS can support up to 32 antenna ports. CSI-RS corresponding to N (N is 1 or greater) antenna ports can be mapped to N RE positions within a time-frequency unit corresponding to one time slot and one RB. When N is 2 or greater, N-port CSI-RS can be multiplexed by CDM, FDM and / or TDM methods. CSI-RS can be mapped to the remaining REs except for REs mapped with CORESET, DMRS and SSB. In the frequency domain, CSI-RS can be configured for the entire bandwidth, a partial bandwidth part (BWP) or a partial bandwidth. CSI-RS can be sent in each RB within the bandwidth in which CSI-RS is configured (ie, density = 1), or CSI-RS can be sent in every two RBs (eg, even or odd RBs) (ie, density = 1 / 2). When CSI-RS is used as a tracking reference signal (TRS), a single-port CSI-RS may be mapped on three subcarriers in each resource block (i.e., density = 3). One or more CSI-RS resource sets may be configured for a UE in the time domain. Each CSI-RS resource set may include one or more CSI-RS configurations. Each CSI-RS resource set may be configured as periodic, semi-persistent, or aperiodic.

[0117] -CSI report configuration may include configuration of feedback type, measurement resources, report type, etc. NZP-CSI-RS resource set may be used for CSI report configuration of corresponding UE. NZP-CSI-RS resource set may be associated with CSI-RS or SSB. Multiple periodic NZP-CSI-RS resource sets may be configured as TRS resource sets. (i) Feedback type includes channel quality indicator (CQI), precoding matrix indicator (PMI), CSI-RS resource indicator (CRI), SSB resource block indicator (SSBRI), layer indicator (LI), rank indicator (RI), first layer (L1)-reference signal received strength (RSRP), etc. (ii) Measurement resources may include configuration of downlink signals and / or downlink resources on which UE performs measurements to determine feedback information. Measurement resources may be configured as ZP and / or NZP CSI-RS resource sets associated with CSI report configuration. NZP CSI-RS resource sets may include CSI-RS sets or SSB sets. For example, L1-RSRP may be measured for a CSI-RS set or an SSB set. (iii) The report type may include the time at which the UE performs the report and the configuration of the uplink channel. The reporting time may be configured as periodic, semi-persistent, or aperiodic. Periodic CSI reports may be sent on the PUCCH. Semi-persistent CSI reports may be sent on the PUCCH or PUSCH based on a medium access control (MAC) control element (CE) indicating enable / disable. Aperiodic CSI reports may be indicated by DCI signaling. For example, the CSI request field of an uplink grant may indicate one of various report trigger sizes. Aperiodic CSI reports may be sent on the PUSCH.

[0118] The UE measures the CSI based on the configuration information related to the CSI. The CSI measurement may include receiving a CSI-RS (720) and acquiring the CSI by calculating the received CSI-RS (730).

[0119] The UE may send a CSI report to the BS (740). For the CSI report, time resources and frequency resources available to the UE are controlled by the BS. 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), L1-RSRP, and / or L-SINR.

[0120] The time domain behavior of CSI reporting supports periodic, semi-persistent, and aperiodic. i) Periodic CSI reporting is performed in short PUCCH and long PUCCH. The periodicity and slot offset of periodic CSI reporting can be configured by RRC, and refer to CSI-ReportConfig IE. ii) SP (semi-periodic) CSI reporting is performed in short PUCCH, long PUCCH or PUSCH. For SP CSI in short / long PUCCH, the periodicity and slot offset are configured by RRC, and CSI reporting is enabled / disabled through a separate MAC CE / DCI. For SP CSI in 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 enabled / disabled by DCI (format 0_1). For SP CSI reporting in PUSCH, a separate RNTI (SP-CSI C-RNTI) is used. The initial CSI report timing follows the PUSCH time domain allocation value indicated by DCI, and subsequent CSI report timing follows the periodicity configured by RRC. DCI format 0_1 ​​may include a CSI request field and enable / disable a specific configured SP-CSI triggering state. SP CSI reporting has the same or similar enable / disable mechanism as with data transmission in SPS PUSCH. iii) Aperiodic CSI reporting is performed in PUSCH and triggered by DCI. In this case, information related to the triggering of aperiodic CSI reporting may be transmitted / indicated / configured via MAC-CE. For AP CSI with AP CSI-RS, the AP CSI-RS timing is configured by RRC and the timing of the AP CSI report is dynamically controlled by DCI.

[0121] Quasi-isotope (QCL)

[0122] Two antenna ports are quasi-colocated when the channel properties of an antenna port are to be inferred from the channel of another antenna port. The channel properties may include one or more of delay spread, Doppler spread, frequency / Doppler shift, average received power, receive timing / average delay, and spatial RX parameters.

[0123] For PDCCH / PDSCH QCL, multiple transmission configuration indication (TCI) states can be configured to the UE through high-layer signaling. For PDCCH QCL, up to 64 TCI states can be configured for PDCCH QCL via RRC, and up to 128 TCI states can be configured for PDSCH QCL via RRC. In the case of PDSCH QCL, a list of multiple TCI states can be configured through the high-layer parameter PDSCH-Config.

[0124] Each TCI state is associated with a QCL configuration parameter between one or two DLRS and a DM-RS port of a PDSCH / PDCCH. The QCL configuration parameter may include qcl-Type1 for the first DLRS and qcl-Type2 for the second DLRS. The QCL type may correspond to one of the following.

[0125] - "QCL-TypeA": {Doppler shift, Doppler spread, average delay, delay spread}

[0126] - "QCL-TypeB": {Doppler shift, Doppler spread}

[0127] - "QCL-TypeC": {Doppler shift, average delay}

[0128] - "QCL-TypeD": {spatial Rx parameters}

[0129] The TCI state configured via RRC signaling is disabled by default.

[0130] For PDSCH QCL, up to 8 TCI states among the TCI states configured via RRC can be enabled through MAC CE. The TCI field included in the DCI that schedules the PDSCH may indicate one of the enabled TCI states (for example, when the TCI field is allowed to be provided in the DCI through RRC signaling), and the UE may receive the PDSCH based on the QCL information corresponding to the indicated TCI state.

[0131] For PDCCH QCL, one TCI state among TCI states configured via RRC may be enabled for the relevant CORESET through MAC CE. In order to receive PDCCH in the corresponding CORESET, the UE may receive PDCCH based on QCL information corresponding to the enabled TCI state.

[0132] Operations related to multiple transmit and receive points (M-TRP)

[0133] Multi-TRP (M-TRP) transmission in which M TRPs send data to a single UE can be divided into two main types: eMBB M-TRP transmission aimed at increasing the transmission rate and URLLC M-TRP transmission aimed at improving the reception success rate and reducing delay.

[0134] DL M-TRP URLLC transmission method refers to a method in which M-TRP uses different spatial (e.g., layer / port), time or frequency resources to send the same data / DCI. For example, TRP 1 can send specific data / DCI on resource 1, and TRP 2 can send specific data / DCI on resource 2 (i.e., the same data / DCI).

[0135] In other words, when the DL M-TRP URLLC transmission method is configured, the UE can receive the same data / DCI using different space, time or frequency resources. In this case, the UE can receive an indication of the QCL RS / type (i.e., DLTCI state) of the space, time or frequency resources to be used for receiving the data / DCI from the BS.

[0136] For example, if data / DCI is received on both resource 1 and resource 2, the BS may provide the UE with the DL TCI state for resource 1 and the DL TCI state for resource 2. High reliability may be achieved by receiving data / DCI on both resource 1 and resource 2. This M-TRP URLLC transmission method may be applied to PDSCH / PDCCH.

[0137] UL M-TRP URLLC transmission method refers to a method in which M-TRP receives the same data / UCI from a single UE using different space, time or frequency resources. For example, TRP 1 can receive the same data / UCI from the UE on resource 1, and TRP 2 can receive the same data / UCI from the UE on resource 2. In addition, TRP 1 and TRP 2 can share data / UCI received from the UE via a backhaul link (connected between TRPs).

[0138] In other words, when the UL M-TRP URLLC transmission method is configured, the UE can send the same data / UCI to each TRP using different space, time or frequency resources. In this case, the UE can receive an indication from the BS about the Tx beam and Tx power (i.e., UL TCI state) to be used on the space, time or frequency resources for sending the same data / UCI. For example, if the same data / UCI is sent on resource 1 and resource 2, the UL TCI state to be used for resource 1 and the UL TCI state to be used for resource 2 can be provided from the BS to the UE. The ULM-TRP URLLC transmission method can be applied to PUSCH / PUCCH.

[0139] In addition, from the perspective of DCI transmission, the M-TRP transmission method can be divided into: i) an M-TRP transmission method based on multiple DCIs (multi-DCI or M-DCI), in which each TRP sends different DCIs; and ii) an M-TRP transmission method based on a single DCI (single DCI or S-DCI), in which one TRP sends DCI. For example, in the case of S-DCI, since all scheduling information about data sent through M-TRP needs to be transmitted in a single DCI, this method can be used in an ideal backhaul (BH) environment that allows dynamic collaboration between two TRPs.

[0140] Regarding M-TRP transmission and reception in Rel-16 NR standardization, PDSCH transmission and reception supports both S-DCI-based M-TRP transmission method and M-DCI-based M-TRP transmission method.

[0141] First, the S-DCI-based M-TRP PDSCH transmission method will be described.

[0142] For S-DCI-based M-TRP PDSCH transmission, one of the SDM, FDM and / or TDM methods can be used. In the case of SDM, the BS uses multiple layers to send a single TB, but the BS sends layers belonging to different DMRS CDM groups through different transmission beams (Tx beams) (i.e., QCLRS or TCI states). Compared with the traditional S-TRP transmission method, this method can increase the number of layers, thereby improving the transmission capacity. In addition, when a single TB is sent using multiple layers, some layers can be sent to TRP 1 and the remaining layers are sent to TRP 2, which can enhance channel reliability through diversity gain.

[0143] For FDM, two schemes are supported: Scheme 2a and Scheme 2b. In Scheme 2a, a single TB is sent across multiple RBs, and RBs in different RB groups are sent using different Tx beams (i.e., QCLRS or TCI states). In Scheme 2b, the same TB is sent across different RB groups, and RBs in different RB groups are sent using different Tx beams (i.e., QCLRS or TCI states). For TDM, two schemes are supported: Scheme 3 and Scheme 4. In Scheme 4 (i.e., inter-slot TDM), the same TB is repeatedly sent across multiple slots, and slots in different slot groups are sent using different Tx beams (i.e., QCL RS or TCI states). In Scheme 3 (i.e., intra-slot TDM), the same TB is repeatedly sent across multiple OFDM symbol groups, and some OFDM symbol groups and the remaining OFDM symbol groups are sent using different Tx beams (i.e., QCLRS or TCI states).

[0144] Next, the M-TRP PDSCH transmission method based on M-DCI will be described.

[0145] In M-TRP PDSCH transmission based on M-DCI, each TRP schedules and sends PDSCH through DCI. In other words, TRP 1 sends PDSCH1 through DCI1, and TRP 2 sends PDSCH2 through DCI 2. When PDSCH1 and PDSCH 2 overlap on the same frequency-time resource, the two PDSCHs are received on the same RE, which leads to increased resource efficiency and transmission capacity. To this end, the concept of CORESET pool is introduced, which refers to a group of multiple CORESETs. For example, TRP 1 sends PDCCH in a CORESET belonging to CORESET pool 0, and also sends PDSCH scheduled by PDCCH. TRP 2 sends PDCCH in a CORESET belonging to CORESET pool 1, and also sends PDSCH scheduled by PDCCH.

[0146] For PUSCH, a specific TRP may schedule PUSCH transmissions to a UE in a CORESET belonging to a CORESET pool. For example, some PUCCH resources may be scheduled by TRP 1 and the remaining PUCCH resources may be scheduled by TRP 2. The UE may send independent PUSCH / PUCCH for each of TRP 1 and TRP 2.

[0147] The UE may identify the PUSCH (or PUCCH) scheduled by the DCI received based on different CORESETs (or CORESETs belonging to different CORESET groups) as the PUSCH (or PUCCH) to be sent to or for different TRPs. In addition, the UL transmission (e.g., PUSCH / PUCCH) method to different TRPs may also be applied to UL transmission to different panels belonging to the same TRP.

[0148] Herein, a CORESET group ID (or a CORESET pool index having the same meaning) may refer to index / identification information (e.g., ID) for distinguishing a CORESET of each TRP / panel. A CORESET group may refer to a CORESET group / union distinguished by index / identification information (e.g., ID) / CORESET group ID for distinguishing a CORESET of each TRP / panel. For example, the CORESET group ID may be specific index information defined in a CORESET configuration. In other words, a CORESET group may be configured / indicated / defined by an index defined in a CORESET configuration of each CORESET. Additionally / alternatively, a CORESET group ID may refer to an index / identification information / indicator for distinguishing / identifying a CORESET configured as / associated with each TRP / panel.

[0149] Herein, the CORESET group ID may be represented as a specific index / specific identification information / specific indicator for distinguishing / identifying a CORESET configured for / associated with each TRP / panel. The corresponding information may be configured / indicated via high-layer signaling (e.g., RRC signaling, MAC-CE, etc.) and / or physical layer signaling (e.g., DCI). For example, it may be configured / indicated that PDCCH detection is performed on a per-CORESET group basis for each TRP / panel. It may be configured / indicated that UCI (e.g., CSI, HARQ-ACK / NACK, SR, etc.) and / or UL physical channel resources (e.g., PUCCH / PRACH / SRS resources) are managed / controlled separately for each TRP / panel on a per-CORESET group basis. Additionally / alternatively, the HARQ ACK / NACK (process / retransmission) of the PDSCH / PUSCH scheduled for each TRP / panel may be managed on a per-CORESET group basis.

[0150] For example, the high-level parameter ControlResourceSet information element (IE) may include a CORESET-related ID (e.g., controlResourceSetID), a CORESET pool index (e.g., CORESETPoolIndex) of the CORESET, a time / frequency resource configuration of the CORESET, TCI information related to the CORESET, etc. For example, the index of the CORESET pool (e.g., CORESETPoolIndex) may be set to 0 or 1. In the present disclosure, a CORESET group may correspond to a CORESET pool, and a CORESET group ID may correspond to a CORESET pool index (e.g., CORESETPoolIndex).

[0151] Regarding M-TRP transmission and reception in Rel-17 NR standardization, M-TRP PDCCH / PDSCH single frequency network (SFN) transmission, M-TRP PUSCH repetition transmission based on S-DCI, and M-TRP PUCCH repetition transmission based on a single PUCCH resource are supported. In these transmission methods, in order to enhance the URLLC target to increase reliability, the same content (ie, DCI / UL TB / UCI, etc.) is repeatedly transmitted. In this case, M-TRP PDCCH repetition transmission is performed based on TDM or FDM, M-TRP PDCCH / PDSCH SFN transmission is performed on the same time / frequency / layer, M-TRP PUSCH repetition transmission based on S-DCI is performed based on TDM, and M-TRP PUCCH repetition transmission based on a single PUCCH resource is performed based on TDM.

[0152] First, the S-DCI-based M-TRP PDCCH repetition transmission method will be described.

[0153] In NR Rel-17 standardization, in order to support M-TRP PDCCH repeated transmission, multiple CORESETs with different TCI states (i.e., different QCLRS) and multiple search space (SS) sets associated with the CORESETs are configured to the UE. For repeated transmission, the BS can indicate / configure the UE that the SS set associated with one CORESET is linked to the SS set associated with another CORESET. Therefore, the UE can identify the PDCCH candidates of the SS set that are being repeatedly transmitted.

[0154] For example, if the UE is configured with two CORESETs: CORESET 0 and CORESET 1, CORESET 0 and CORESET 1 are associated with SS set 0 and SS set 1, respectively, and SS set 0 and SS set 1 can be linked to each other. The UE can recognize that the same DCI is repeatedly transmitted on the PDCCH candidates of SS set 0 and SS set 1. In addition, the UE can recognize that a specific PDCCH candidate in SS set 0 and a specific PDCCH candidate in SS set 1 are paired to repeatedly transmit the same DCI based on a specific rule. The two PDCCH candidates are called linked PDCCH candidates, and as long as the UE correctly receives any one of the two PDCCH candidates, the UE can successfully decode the DCI. However, when the UE receives a PDCCH candidate in SS set 0, the UE can use the QCLRS (i.e., DL beam) of the TCI state in CORESET 0 associated with SS set 0. When the PDCCH candidate is received in SS set 1, the UE can use the QCLRS (i.e., DL beam) of the TCI state in CORESET 1 associated with SS set 1. Therefore, the UE can use different beams to receive linked PDCCH candidates.

[0155] Next, the M-TRP SFN PDCCH / PDSCH transmission method will be described.

[0156] As a form of M-TRP PDCCH repetition transmission, M-TRP may repeatedly send the same DCI via the same time / frequency / DMRS port, and this transmission method may be referred to as SFN PDCCH transmission. However, for SFN PDCCH transmission, instead of configuring multiple CORESETs with different TCI states, the BS configures multiple TCI states within a single CORESET. When a UE receives a PDCCH candidate through an SS set associated with a single CORESET, the UE may use all multiple configured TCI states to perform channel estimation on the PDCCH DMRS and attempt decoding.

[0157] In the above-mentioned M-TRP PDSCH repetition transmission, two TRPs repeatedly send channels on different resources. However, if the resources used by the two TRPs are the same, that is, if the same channel is repeatedly sent via the same frequency / time / layer (i.e., DMRS port), the reliability of the channel can be improved. In this case, since the repeatedly transmitted same channel is not separated by different resources, from the perspective of the receiver (e.g., UE), the channel can be combined during transmission (i.e., in the air) and received as a single channel (e.g., composite channel). For SFN PDSCH transmission, the UE can be configured with two DL TCI states to receive PDSCH DMRS.

[0158] Next, the S-DCI-based M-TRP PUSCH repetition transmission method will be described.

[0159] In NR Rel-17 standardization, for S-DCI-based M-TRP PUSCH transmission, the BS can configure two SRS sets for the UE. Each set is used to indicate the UL Tx port, UL beam / QCL information of TRP 1 and TRP 2. In addition, the BS can indicate the SRS resources of each SRS resource set through the two SRI fields included in a single DCI, and can also indicate up to two PC parameter sets. For example, the first SRI field may indicate the SRS resources and power control (PC) parameter set defined in SRS resource set 0, and the second SRI field may indicate the SRS resources and PC parameter set defined in SRS resource set 1. Through the first SRI field, the UL Tx port, PC parameter set and UL beam / QCL information of TRP 1 can be provided to the UE. Thereafter, the UE can perform PUSCH transmission on the TO corresponding to SRS resource set 0. Similarly, through the second SRI field, the UL Tx port, PC parameter set and UL beam / QCL information of TRP 2 can be provided to the UE. Thereafter, the UE may perform PUSCH transmission on the TO corresponding to SRS resource set 1. In addition to the SRI field, the transmission precoding matrix indicator (TPMI), phase tracking reference signal (PTRS), and transmission power control (TPC) fields have been extended from a single field to two fields to allow separate indications for each TRP. In addition, a 2-bit SRS resource set indication field is introduced. Therefore, a specific SRS set can be selected from two SRS sets to perform single transmit / receive point (STRP) PUSCH repetition transmission, or two sets can be selected to perform M-TRP PUSCH repetition transmission. Specifically, when the field is set to 00 or 01, SRS set 0 or SRS set 1 is indicated, respectively, and STRP PUSCH transmission corresponding to each set is performed. When the field is set to 10, (SRS set 0, SRS set 1) is indicated, and M-TRP PUSCH transmission is performed in the order of the indicated set pairs. That is, set 0 corresponds to the first PUSCH transmission opportunity (TO). When the field is set to 11, it indicates (SRS set 1, SRS set 0), and M-TRP PUSCH transmission is performed in the order of the indicated set pairs. That is, set 1 corresponds to the first PUSCH TO.

[0160] Next, the M-TRP PUCCH repetition transmission method based on a single PUCCH resource will be described.

[0161] In the NR Rel-17 standardization, for M-TRP PUCCH transmission based on a single PUCCH resource, the BS may enable / configure two pieces of spatial relationship information for the single PUCCH resource of the UE (in the case of FR1, two PC parameter sets may be enabled / configured). When UL UCI is sent on the PUCCH resource, each piece of spatial relationship information may be used to indicate the spatial relationship information of TRP 1 and TRP 2 to the UE, respectively. For example, through the value indicated by the first spatial relationship information, the UE may be configured with the Tx beam / PC parameters of TRP 1 and perform PUCCH transmission on the TO corresponding to TRP 1 using the corresponding information. Similarly, through the value indicated by the second spatial relationship information, the UE may be configured with the Tx beam / PC parameters of TRP 2 and perform PUCCH transmission on the TO corresponding to TRP 2 using the corresponding information.

[0162] In addition, in order to support repeated transmission of M-TRP PUCCH, the configuration method is enhanced to allow two pieces of spatial relationship information to be configured for PUCCH resources. That is, when PC parameters such as PLRS, Alpha, P0, and closed-loop index are configured for each piece of spatial relationship information, the spatial relationship RS can be configured. As a result, the PC information and spatial relationship RS information corresponding to the two TRPs can be configured through two pieces of spatial relationship information. Therefore, the UE sends UCIPUCCH (i.e., CSI, ACK / NACK, SR, etc.) using the first spatial relationship information in the first TO and sends the same UCIPUCCH using the second spatial relationship information in the second TO. In the present disclosure, a PUCCH resource configured with two pieces of spatial relationship information is referred to as an M-TRP PUCCH resource, and a PUCCH resource configured with a single piece of spatial relationship information is referred to as an S-TRP PUCCH resource.

[0163] TCI (Transmission Configuration Indicator) Status / Beam Indicator

[0164] In the description of the present disclosure, when sending / receiving data / DCI / UCI on a specific space, time or frequency resource, using (or mapping) a specific TCI state (or TCI) may mean: in the case of DL, it may mean that the UE uses the QCL type and QCL RS indicated by the specific TCI state of the specific space, time or frequency resource to estimate the channel from the DMRS, and then uses the estimated channel to receive / demodulate the data / DCI / UCI.

[0165] When receiving / sending data / DCI / UCI on specific space, time or frequency resources, using (or mapping) a specific TCI state (or TCI) may mean: in the case of UL, it may mean that the UE sends / modulates DMRS and data / UCI using the Tx beam and / or Tx power indicated by the specific TCI state of the specific space, time or frequency resources.

[0166] The ULTCI state may include information about the Tx beam or Tx power of the UE. In addition, the BS may configure the spatial relationship information to the UE through other parameters instead of the TCI state.

[0167] For example, the UL TCI state may be directly indicated to the UE through the UL grant DCI. Alternatively, the UL TCI state may refer to the spatial relationship information about the sounding reference signal (SRS) resource indicated by the SRS resource indicator (SRI) field in the UL grant DCI. Alternatively, the UL TCI state may refer to the open-loop (OP) Tx power control parameter associated with the value indicated by the SRI field in the UL grant DCI.

[0168] Here, for example, the OL Tx power control parameters may include j (index of OP parameters Po and alpha (up to 32 parameter value sets per cell)), q_d (index of DLRS resources for path loss (PL) measurements (up to four measurements per cell)) and / or I (index of closed-loop power control process (up to two processes per cell)).

[0169] For convenience, it is assumed in the present disclosure that two TRPs collaborate to perform transmission / reception operations, but the present disclosure is not limited to this. In other words, the present disclosure can be extended and applied to environments with three or more M-TRPs and environments in which transmission / reception is performed with different panels or beams within the same TRP. The UE can identify different TRPs as different TCI states. When the UE sends / receives data / DCI / UCI using TCI state 1, it means that the UE is sending / receiving data / DCI / UCI from or to TRP 1.

[0170] Generally, TO refers to each channel sent at different times when multiple channels are time division duplexed (TDM), each channel sent on different frequencies / RBs when multiple channels are frequency division multiplexed (FDM), or each channel sent on different layers / beams / DMRS ports when multiple channels are space division multiplexed (SDM). Each TO can be mapped to one TCI state. When the same channel is sent repeatedly, complete data / DCI / UCI is sent on one TO, and the receiver can receive multiple TOs to increase the reception success rate.

[0171] Multi-TB PUSCH / PDSCH scheduling based on single DCI

[0172] In Rel.17NR, a single DCI can schedule multiple PUSCH / PDSCHs simultaneously in a high frequency band (over 5.26GHz). For example, the time domain resource allocation (TDRA) field in the PUSCH scheduling DCI can indicate multiple TDRAs (i.e., multiple TOs) at a time, and different TBs are sent via PUSCH on each TO. The frequency domain resource allocation (FDRA), modulation and coding scheme (MCS), TPMI, and SRI values ​​of the DCI are applied together to all scheduled TBs. In addition, the new data indicator (NDI) and redundant version (RV) values ​​of each TB are indicated separately by the DCI, and the HARQ number is indicated as a single value, but increases sequentially in the order of TOs starting from the initial TO.

[0173] STxMP (simultaneous transmission across multiple panels)

[0174] In order to support Rel.18NR standardization, a method for UE to simultaneously send multiple channels / RS of the same type or different types is being discussed. At present, traditional UEs are limited in sending multiple channels / RS at the same time (for example, although the UE can simultaneously send multiple SRS resources in different SRS sets for UL beam measurement, the UE may not be able to send multiple PUSCHs at the same time). However, in the future, this restriction may be relaxed so that advanced UEs are allowed to use multiple transmission panels to send multiple channels or RSs simultaneously, and these UEs are called STxMP UEs. For example, two PUSCHs corresponding to two ULTBs can be scheduled on the same RE. For the transmission of PUSCH 1 and PUSCH 2, spatial relationship RS1 and PC parameter set 1 (i.e., ULTCI state 1) are configured for PUSCH 1, and spatial relationship RS2 and PC parameter set 2 (i.e., ULTCI state 2) are configured for PUSCH 2. The UE sends PUSCH 1 using panel 1 corresponding to ULTCI state 1, and sends PUSCH 2 using panel 2 corresponding to ULTCI state 2.

[0175] When the BS schedules PUSCH via DCI, the BS may indicate whether PUSCH needs to be sent based on STxMP transmission, single-panel transmission, or M-TRP PUSCH repeated transmission. The UE needs to have STxMP capability and the STxMP mode needs to be pre-enabled through RRC signaling. To this end, the existing SRS resource set indication field may be redefined, or a new DCI field may be introduced.

[0176] Enhanced UL / DL beam configuration in unified TCI framework

[0177] In NR Rel-15 / Rel-16, high-layer signaling such as RRC and MAC CE is mainly used for beam indication / update operations between BS and UE for reception and transmission. In addition, some channels / RS (e.g., PDSCH and PUSCH) support DCI-based beam indication operations.

[0178] Figure 8 1 is a diagram illustrating the concept of a unified TCI framework introduced in NRRel.17. In the Rel.17 unified TCI framework, DL DCI (e.g., DCI format 1-1 or 1-2) may indicate not only the DL TCI state but also the UL TCI state together. Alternatively, DL DCI may indicate only the UL TCI state without the DL TCI state. Therefore, in Rel.17, dynamic beam update operation may be supported by a joint DL / UL TCI state indication or a separate DL / UL TCI state indication.

[0179] The dynamic beam updating operation may include a common beam updating operation. For example, the BS provides a common single beam for multiple specific channel / RS combinations to the UE through DCI and / or MAC-CE. Therefore, the UE may perform a common beam updating operation.

[0180] Therefore, the method for UL beam and PC configuration in Rel.15 / 16 can be replaced by the ULTCI state indication method in Rel.17. In Rel.17, a ULTCI state can be indicated by the TCI field of DLDCI. The ULTCI state can be applied to all PUSCHs and PUCCHs after a specific period of time called the beam application time, and the ULTCI state can also be applied to some or all indicated SRS resource sets. Specifically, in the case of UL, common beam updates can be applied to all or a subset of dynamic grant / configuration grant (DG / CG) PUSCHs and dedicated PUCCHs. In addition, non-periodic CSI-RS and SRS used for tracking / beam management (BM) can also be configured as target channels / RSs for common beam updates.

[0181] Additionally, in the DL case, common beam updating can be applied to UE-specific CORESET and UE-specific reception on PDSCH.

[0182] With regard to this common beam applicability, the Rel-17 beam pointing operation is mainly related to the STRP operation.

[0183] In the Rel. 17 unified TCI framework, if the number of DL TCI states is represented as M and the number of UL TCI states is represented as N, the numbers of DL / UL TCI states for common beam update may be M=1 and N=1, respectively.

[0184] Table 6 shows the discussion related to the values ​​of M and N in the standardization process of the unified TCI framework. In Table 6, (iii) M=N=1 is related to common beam updating.

[0185] [Table 6]

[0186]

[0187]

[0188] In the recent NR Rel.18 standardization, a method of indicating multiple UL TCI states (and / or DL ​​TCI states) through the TCI field of DL DCI (DL Grant DCI) (eg, DCI format 1_x) is under discussion.

[0189] Regarding the NRRel-18 MIMO standardization, the discussion will focus on the extension of the unified TCI framework configuration (M>1 and / or N>1) and the M-TRP operation based on these configurations. Table 7 shows the discussion topics related to the NRRel-18 MIMO standardization. For example, as a specific implementation example of M-TRP operation, M DLTCI states may correspond to M DL signal transmission points, and N ULTCI states may correspond to N UL signal reception points. However, the present disclosure is not limited to this. Although M>1 and / or N>1 in (iv) to (vi) of Table 6 related to Rel.17 are intended for STRP operation, the extension of the unified TCI framework configuration (M>1 and / or N>1) to be discussed in Rel.18 may be related to M-TRP operation.

[0190] [Table 7]

[0191]

[0192]

[0193] When the Rel-17 multi-beam configuration of M=N=1 is extended to the case where the values ​​of M and N are set to 1 or 2, configuration for multiple TCI states is required, unlike the single TCI state in Rel.17. In addition, it is necessary to consider a method of configuring target channels / RSs for common beam applicability using each TCI state in a subset form.

[0194] The present disclosure proposes a method for configuring DCI and / or MAC-CE TCI status fields for beam indication based on the values ​​of M and / or N in a unified framework and using beam indication based on these configurations.

[0195] According to an embodiment of the present disclosure, the number of TCI fields in DCI and / or MAC-CE used for beam indication may be indicated / enabled (determined) based on M>1 and / or N>1.

[0196] - Configuration related to M>1 and / or N>1 (including values ​​of M and N and / or TCI state configuration related to M and N) may be provided through RRC or MAC-CE.

[0197] - When M≠N, the number of TCI fields in the beam indication DCI / MAC-CE may follow the larger value between the values ​​of M and N. Alternatively, when M≠N, the TCI field set to a smaller value related to UL or DL ​​may be indicated by a predefined or explicit method.

[0198] - Individual DL / UL target channels / RS for common beam applicability may be configured as a single entity or in multiple subsets (via RRC configuration) depending on the value of M and / or N. These configurations are predefined and either associated with individual TCI fields or with separate indicators.

[0199] The present proposal relates to a method for indicating TCI states in a unified TCI framework when the values ​​of M and N are set to 2 or greater (instead of the traditional value of 1) for DL / UL beam and common beam applicability. In conventional Rel-17, the beam indication DCI and / or MAC-CE for common beam indication indicates a joint or separate DL / UL TCI state using a single TCI state (M=N=1). However, if M>1 and / or N>1 is configured by RRC or MAC-CE, it may be necessary to support (at least) two TCI states in the corresponding beam indication DCI / MAC-CE.

[0200] As a specific example, joint TCI state 0 may be indicated by TCI field #1, and joint TCI state 3 may be indicated by TCI field #2. However, the present disclosure is not limited to this. For example, if M or N is set to 2, the number of TCI fields in the beam indication DCI / MAC-CE may be 2. However, the present disclosure is not limited to this. Assuming this case, there is no problem when M=N=2. However, when the DL / UL related configurations are different (for example, {M=2, N=1} or {M=1, N=2}), ambiguity may arise based on M / N as to which TCI field is needed for unified TCI framework operation. Specifically, when {M=2, N=1}, both TCI field #1 and TCI field #2 are used for DL, but there may be ambiguity as to whether TCI field #1 or TCI field #2 is used for UL. To solve this problem, the TCI field corresponding to the smaller value between M and N may be used in descending / ascending order according to a predefined rule (e.g., when M=2 and N=1, TCI field #1 is used for both DL / UL, and for N=1 in descending order, TCI field #2 is used only for DL). Alternatively, a specific TCI field corresponding to the M / N configuration may be explicitly indicated (e.g., for M=2, TCI field={#1,#2}, for N=1, TCI field={#1}).

[0201] - Individual DL / UL target channels / RS for common beam applicability may be configured as a single entity or in multiple subsets (via RRC configuration) depending on the value of M and / or N. These configurations are predefined and either associated with individual TCI fields or with separate indicators.

[0202] The present proposal relates to a method for indicating TCI states in a unified TCI framework when the values ​​of M and N are set to 2 or greater (instead of the traditional value of 1) for DL / UL beam and common beam applicability. In conventional Rel-17, the beam indication DCI and / or MAC-CE for common beam indication indicates a joint or separate DL / UL TCI state using a single TCI state (M=N=1). However, if M>1 and / or N>1 is configured by RRC or MAC-CE, it may be necessary to support (at least) two TCI states in the corresponding beam indication DCI / MAC-CE.

[0203] As a specific example, joint TCI state 0 may be indicated by TCI field #1, and joint TCI state 3 may be indicated by TCI field #2. However, the present disclosure is not limited to this. For example, if M or N is set to 2, the number of TCI fields in the beam indication DCI / MAC-CE may be 2. However, the present disclosure is not limited to this. Assuming this case, there is no problem when M=N=2. However, when the DL / UL related configurations are different (for example, {M=2, N=1} or {M=1, N=2}), ambiguity may arise based on M / N as to which TCI field is needed for unified TCI framework operation. Specifically, when {M=2, N=1}, both TCI field #1 and TCI field #2 are used for DL, but there may be ambiguity as to whether TCI field #1 or TCI field #2 is used for UL. To solve this problem, the TCI field corresponding to the smaller value between M and N may be used in descending / ascending order according to a predefined rule (e.g., when M=2 and N=1, TCI field #1 is used for both DL / UL, and for N=1 in descending order, TCI field #2 is used only for DL). Alternatively, a specific TCI field corresponding to the M / N configuration may be explicitly indicated (e.g., for M=2, TCI field={#1,#2}, for N=1, TCI field={#1}).

[0204] Fig.11 An implementation example of a method in which a BS transmits a PDCCH signal according to at least some of the above proposals is shown. Fig.11 , you can refer to the above content to understand Fig.11 .

[0205] Reference Fig.11 , the BS can send configuration information about TCI to the UE through high-layer signaling (B05).

[0206] The BS may transmit DCI including one TCI field to the UE through a physical downlink control channel (PDCCH) signal (B10).

[0207] The BS may provide the UE with TCI state information about at least some of the multiple signals based on the TCI field. The multiple signals may include: a first signal set including a first PDSCH signal; and a second signal set including a second PDSCH signal. At least one code point among the multiple code points of the TCI field may be mapped to a combination of first TCI state information about a first signal set including the first PDSCH signal and second TCI state information about a second signal set including the second PDSCH signal.

[0208] For example, the first TCI state information may be first joint TCI state information as a combination of a first DLTCI of a first DL signal in the first signal set and a first UL TCI of a first UL signal in the first signal set. The second TCI state information may be second joint TCI state information as a combination of a second DLTCI of a second DL signal in the second signal set and a second UL TCI of a second UL signal in the second signal set.

[0209] For example, the first TCI state information may indicate at least one of a first DLTCI of a first DL signal in the first signal set or a first UL TCI of a first UL signal in the first signal set, wherein the first DLTCI is separated from the first UL TCI. The second TCI state information may indicate at least one of a second DL TCI of a second DL signal in the second signal set or a second UL TCI of a second UL signal in the second signal set, wherein the second DLTCI is separated from the second UL TCI.

[0210] The first signal set may include at least one of a first PDCCH signal, a first CSI-RS, a first PUSCH signal, a first PUCCH signal, or a first SRS in a first CORESET on a first control resource set (CORESET), and the second signal set may include at least one of a second PDCCH signal, a second CSI-RS, a second PUSCH signal, a second PUCCH signal, or a second SRS on a second CORESET.

[0211] First subset information about at least part of the signals in the first signal set to which the first TCI state information is applied and second subset information about at least part of the signals in the second signal set to which the second TCI state information is applied may be configured to the UE through higher layer signaling.

[0212] The first QCL information may be commonly applied to the first signal set based on the first TCI state information, and the second QCL information may be commonly applied to the second signal set based on the second TCI state information.

[0213] The DCI may have a DL grant DCI format for DL ​​scheduling.

[0214] At least one code point mapped to the combination of the first TCI state information and the second TCI state information may be related to the M-TRP operation.

[0215] The BS may transmit or receive at least one of a first signal set based on the first TCI state information and a second signal set based on the second TCI state information.

[0216] Fig.12A communication system 1 applied to the present disclosure is shown.

[0217] Reference Fig.12 , the communication system 1 includes a wireless device, a base station (BS), and a network. Herein, a wireless device refers to a device that performs communication using a radio access technology (RAT) (e.g., 5G new RAT (NR) or long term evolution (LTE)), and may be referred to as a communication / radio / 5G device. The wireless device may include, but is not limited to, a robot 100a, vehicles 100b-1 and 100b-2, an extended reality (XR) device 100c, a handheld device 100d, a home appliance 100e, an Internet of Things (IoT) device 100f, and an artificial intelligence (AI) device / server 400. For example, a vehicle may include a vehicle with a wireless communication function, an autonomous driving vehicle, and a vehicle capable of performing communication between vehicles. Herein, a vehicle may include an unmanned aerial vehicle (UAV) (e.g., a drone). XR devices may include augmented reality (AR) / virtual reality (VR) / mixed reality (MR) devices, and may be implemented in the form of a head mounted device (HMD), a head up display (HUD) installed in a vehicle, a television, a smart phone, a computer, a wearable device, a home appliance device, a digital sign, a vehicle, a robot, etc. Handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebooks). Home appliances may include TVs, refrigerators, and washing machines. IoT devices may include sensors and smart meters. For example, a BS and a network may be implemented as wireless devices, and a specific wireless device 200a may operate as a BS / network node relative to other wireless devices.

[0218] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. The AI ​​technology may be applied to the wireless devices 100a to 100f, and the wireless devices 100a to 100f may be connected to the AI ​​server 400 via the network 300. The network 300 may be configured using a 3G network, a 4G (e.g., LTE) network, or a 5G (e.g., NR) network. Although the wireless devices 100a to 100f may communicate with each other via the BS 200 / network 300, the wireless devices 100a to 100f may perform direct communication (e.g., side link communication) with each other without passing through the BS / network. For example, vehicles 100b-1 and 100b-2 may perform direct communication (e.g., vehicle-to-vehicle (V2V) / vehicle-to-everything (V2X) communication). An IoT device (e.g., a sensor) may perform direct communication with other IoT devices (e.g., a sensor) or other wireless devices 100a to 100f.

[0219] Wireless communication / connection 150a, 150b or 150c may be established between wireless devices 100a to 100f / BS200 or BS200 / BS200. Herein, wireless communication / connection may be established through various RATs (e.g., 5G NR) such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication) or inter-BS communication (e.g., relay, integrated access backhaul (IAB)). The wireless device and the BS / wireless device may send / receive radio signals to / from each other through wireless communication / connection 150a and 150b. For example, wireless communication / connection 150a and 150b may send / receive signals through various physical channels. To this end, at least a portion of various configuration information for configuring processes for sending / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation, and resource mapping / demapping), and resource allocation processes may be performed based on various proposals of the present disclosure.

[0220] Fig.13 A wireless device suitable for use with the present disclosure is shown.

[0221] Reference Fig.13 , the first wireless device 100 and the second wireless device 200 may transmit radio signals via various RATs (e.g., LTE and NR). Herein, {the first wireless device 100 and the second wireless device 200} may correspond to Fig.12 {wireless device 100x and BS 200} and / or {wireless device 100x and wireless device 100x}.

[0222] The first wireless device 100 may include one or more processors 102 and one or more memories 104, and further include one or more transceivers 106 and / or one or more antennas 108. The processor 102 may control the memory 104 and / or the transceiver 106, and may be configured to implement the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. For example, the processor 102 may process the information in the memory 104 to generate first information / signals, and then transmit a radio signal including the first information / signals through the transceiver 106. The processor 102 may receive a radio signal including second information / signals through the transceiver 106, and then store information obtained by processing the second information / signals in the memory 104. The memory 104 may be connected to the processor 102, and may store various information related to the operation of the processor 102. For example, the memory 104 may store software codes including commands for executing part or all of the processes controlled by the processor 102 or for executing the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. Herein, the processor 102 and the memory 104 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 106 may be connected to the processor 102 and transmit and / or receive radio signals through one or more antennas 108. Each transceiver 106 may include a transmitter and / or a receiver. The transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0223] The second wireless device 200 may include one or more processors 202 and one or more memories 204, and further include one or more transceivers 206 and / or one or more antennas 208. The processor 202 may control the memory 204 and / or the transceiver 206, and may be configured to implement the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. For example, the processor 202 may process the information in the memory 204 to generate third information / signals, and then transmit a radio signal including the third information / signals through the transceiver 206. The processor 202 may receive a radio signal including fourth information / signals through the transceiver 206, and then store information obtained by processing the fourth information / signals in the memory 204. The memory 204 may be connected to the processor 202, and may store various information related to the operation of the processor 202. For example, the memory 204 may store software codes including commands for executing part or all of the processes controlled by the processor 202 or for executing the description, functions, processes, proposals, methods, and / or operation flowcharts disclosed in this document. Herein, the processor 202 and the memory 204 may be part of a communication modem / circuit / chip designed to implement a RAT (e.g., LTE or NR). The transceiver 206 may be connected to the processor 202 and transmit and / or receive radio signals through one or more antennas 208. Each transceiver 206 may include a transmitter and / or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In the present disclosure, a wireless device may represent a communication modem / circuit / chip.

[0224] In the following, the hardware elements of the wireless devices 100 and 200 will be described in more detail. One or more protocol layers may be implemented by (but not limited to) one or more processors 102 and 202. For example, one or more processors 102 and 202 may implement one or more layers (e.g., functional layers such as PHY, MAC, RLC, PDCP, RRC, and SDAP). One or more processors 102 and 202 may generate one or more protocol data units (PDUs) and / or one or more service data units (SDUs) according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document. One or more processors 102 and 202 may generate messages, control information, data, or information according to the descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document. One or more processors 102 and 202 may generate a signal (e.g., a baseband signal) including a PDU, SDU, message, control information, data, or information according to the description, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document, and provide the generated signal to one or more transceivers 106 and 206. One or more processors 102 and 202 may receive a signal (e.g., a baseband signal) from one or more transceivers 106 and 206 and obtain the PDU, SDU, message, control information, data, or information according to the description, functions, procedures, proposals, methods, and / or operational flowcharts disclosed in this document.

[0225] One or more processors 102 and 202 may be referred to as controllers, microcontrollers, microprocessors, or microcomputers. One or more processors 102 and 202 may be implemented by hardware, firmware, software, or a combination thereof. As an example, one or more application specific integrated circuits (ASICs), one or more digital signal processors (DSPs), one or more digital signal processing devices (DSPDs), one or more programmable logic devices (PLDs), or one or more field programmable gate arrays (FPGAs) may be included in one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flow charts disclosed in this document may be implemented using firmware or software, and the firmware or software may be configured to include modules, processes, or functions. Firmware or software configured to execute the descriptions, functions, processes, proposals, methods, and / or operational flow charts disclosed in this document may be included in one or more processors 102 and 202 or stored in one or more memories 104 and 204 to be driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods and / or operational flow charts disclosed in this document may be implemented in the form of codes, commands and / or command sets using firmware or software.

[0226] One or more memories 104 and 204 may be connected to one or more processors 102 and 202 and store various types of data, signals, messages, information, programs, codes, instructions and / or commands. One or more memories 104 and 204 may be configured by read-only memory (ROM), random access memory (RAM), electrically erasable programmable read-only memory (EPROM), flash memory, hard disk drive, register, cache memory, computer-readable storage medium and / or a combination thereof. One or more memories 104 and 204 may be located inside and / or outside of one or more processors 102 and 202. One or more memories 104 and 204 may be connected to one or more processors 102 and 202 by various technologies such as wired or wireless connections.

[0227] One or more transceivers 106 and 206 may send user data, control information and / or radio signals / channels mentioned in the method and / or operation flow chart of this document to one or more other devices. One or more transceivers 106 and 206 may receive user data, control information and / or radio signals / channels mentioned in the description, function, process, proposal, method and / or operation flow chart disclosed in this document from one or more other devices. For example, one or more transceivers 106 and 206 may be connected to one or more processors 102 and 202 and send and receive radio signals. For example, one or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may send user data, control information or radio signals to one or more other devices. One or more processors 102 and 202 may perform control so that one or more transceivers 106 and 206 may receive user data, control information or radio signals from one or more other devices. One or more transceivers 106 and 206 may be connected to one or more antennas 108 and 208, and one or more transceivers 106 and 206 may be configured to send and receive user data, control information and / or radio signals / channels mentioned in the description, functions, processes, proposals, methods and / or operation flow charts disclosed in this document through one or more antennas 108 and 208. In this document, one or more antennas may be multiple physical antennas or multiple logical antennas (e.g., antenna ports). One or more transceivers 106 and 206 may convert received radio signals / channels, etc. from RF band signals to baseband signals so as to process received user data, control information, radio signals / channels, etc. using one or more processors 102 and 202. One or more transceivers 106 and 206 may convert user data, control information, radio signals / channels, etc. processed using one or more processors 102 and 202 from baseband signals to RF band signals. To this end, one or more of the transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0228] Fig.14 Another example of a wireless device applicable to the present disclosure is shown. The wireless device can be used according to the usage / service (refer to Fig.12 ) are implemented in various forms.

[0229] Reference Fig.14 , the wireless devices 100 and 200 may correspond to Fig.13The wireless devices 100 and 200 of the present invention may be configured by various elements, components, units / parts and / or modules. For example, each of the wireless devices 100 and 200 may include a communication unit 110, a control unit 120, a memory unit 130 and an additional component 140. The communication unit may include a communication circuit 112 and a transceiver 114. For example, the communication circuit 112 may include Fig.13 One or more processors 102 and 202 and / or one or more memories 104 and 204. For example, the transceiver 114 may include Fig.13 The control unit 120 is electrically connected to the communication unit 110, the memory unit 130, and the additional components 140, and controls the overall operation of the wireless device. For example, the control unit 120 may control the electrical / mechanical operation of the wireless device based on the program / code / command / information stored in the memory unit 130. The control unit 120 may transmit information stored in the memory unit 130 to the outside (e.g., other communication devices) via the communication unit 110 through a wireless / wired interface, or store information received from the outside (e.g., other communication devices) via the communication unit 110 in the memory unit 130 through a wireless / wired interface.

[0230] The additional components 140 may be configured differently depending on the type of wireless device. For example, the additional components 140 may include at least one of a power supply unit / battery, an input / output (I / O) unit, a drive unit, and a computing unit. The wireless device may be configured in the form of, but not limited to, a robot ( Fig.12 100a), vehicles ( Fig.12 100b-1 and 100b-2), XR devices ( Fig.12 100c), handheld device ( Fig.12 100d), household appliances ( Fig.12 100e), IoT devices ( Fig.12 100f), digital broadcasting terminal, holographic device, public safety device, MTC device, medical device, fintech device (or financial device), security device, climate / environmental device, AI server / device ( Fig.12 400), BS( Fig.12 200), network nodes, etc. The wireless device can be used in a mobile or fixed location according to the usage example / service.

[0231] exist Fig.14In the wireless devices 100 and 200, various elements, components, units / parts and / or modules in the wireless devices 100 and 200 may all be connected to each other through a wired interface, or at least a part thereof may be wirelessly connected through the communication unit 110. For example, in each of the wireless devices 100 and 200, the control unit 120 and the communication unit 110 may be wired, and the control unit 120 and the first unit (e.g., 130 and 140) may be wirelessly connected through the communication unit 110. The various elements, components, units / parts and / or modules within the wireless devices 100 and 200 may also include one or more elements. For example, the control unit 120 may be configured by a collection of one or more processors. As an example, the control unit 120 may be configured by a collection of a communication control processor, an application processor, an electronic control unit (ECU), a graphics processing unit and a memory control processor. As another example, the memory unit 130 may be configured by 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.

[0232] Fig.15 A vehicle or an autonomous vehicle applied to the present disclosure is shown. The vehicle or the autonomous vehicle can be implemented by a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc.

[0233] Reference Fig.15 , the vehicle or autonomous driving vehicle 100 may include 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 may be configured as a part of the communication unit 110. Blocks 110 / 130 / 140a to 140d correspond to Fig.14 Block 110 / 130 / 140.

[0234] The communication unit 110 may send and receive signals (e.g., data and control signals) to and from external devices such as other vehicles, BSs (e.g., gNBs and roadside units), and servers. The control unit 120 may perform various operations by controlling elements of the vehicle or autonomous vehicle 100. The control unit 120 may include an electronic control unit (ECU). The drive unit 140a may enable the vehicle or autonomous vehicle 100 to travel on a road. The drive unit 140a may include an engine, a motor, a power system, wheels, brakes, a steering device, etc. The power supply unit 140b may supply power to the vehicle or autonomous vehicle 100, and include a wired / wireless charging circuit, a battery, etc. The sensor unit 140c may obtain vehicle status, surrounding environment information, user information, etc. The sensor unit 140c may include an inertial measurement unit (IMU) sensor, a collision sensor, a wheel sensor, a speed sensor, a slope sensor, a weight sensor, a heading sensor, a position module, a vehicle forward / backward sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a depth sensor, an ultrasonic sensor, a lighting sensor, a pedal position sensor, etc. The autonomous driving unit 140d may implement a technology for maintaining a lane in which the vehicle is traveling, a technology for automatically adjusting a speed (e.g., adaptive cruise control), a technology for autonomously traveling along a determined path, a technology for traveling by automatically setting a path if a destination is set, and the like.

[0235] For example, the communication unit 110 may receive map data, traffic information data, etc. from an external server. The autonomous driving unit 140d may generate an autonomous driving path and a driving plan from the obtained data. The control unit 120 may control the drive unit 140a so that the vehicle or the autonomous driving vehicle 100 may move along the autonomous driving path according to the driving plan (e.g., speed / direction control). In the middle of autonomous driving, the communication unit 110 may aperiodically / periodically obtain the latest traffic information data from the external server and obtain surrounding traffic information data from neighboring vehicles. In the middle of autonomous driving, the sensor unit 140c may obtain vehicle status and / or surrounding environment information. The autonomous driving unit 140d may update the autonomous driving path and driving plan based on the newly obtained data / information. The communication unit 110 may transmit information about the vehicle position, autonomous driving path, and / or driving plan to an external server. The external server may predict traffic information data based on information collected from the vehicle or autonomous driving vehicle using AI technology, etc., and provide the predicted traffic information data to the vehicle or autonomous driving vehicle.

[0236] Fig.16 is a diagram illustrating a DRX operation of a UE according to an embodiment of the present disclosure.

[0237] The UE may perform DRX operation in the process and / or method described / proposed above. A UE configured with DRX may reduce power consumption by discontinuously receiving DL signals. DRX may be performed in the RRC_IDLE state, the RRC_INACTIVE state, and the RRC_CONNECTED state. The UE performs DRX in the RRC_IDLE state and the RRC_INACTIVE state to discontinuously receive paging signals. DRX in the RRC_CONNECTED state (RRC_CONNECTED DRX) will be described below.

[0238] Reference Fig.16 , the DRX cycle includes an on-duration and a DRX opportunity. The DRX cycle defines the time interval between periodic repetitions of the on-duration. The on-duration is the time period during which the UE monitors the PDCCH. When the UE is configured with DRX, the UE performs PDCCH monitoring during the on-duration. When the UE successfully detects the PDCCH during the PDCCH monitoring, the UE starts the inactivity timer and remains awake. On the contrary, when the UE fails to detect any PDCCH during the PDCCH monitoring, the UE transitions to a sleep state after the on-duration. Therefore, when DRX is configured, PDCCH monitoring / reception may be performed discontinuously in the time domain in the process and / or method described / proposed above. For example, when DRX is configured, the PDCCH reception timing (e.g., a time slot with a PDCCHSS) may be configured discontinuously according to the DRX configuration in the present disclosure. On the contrary, when DRX is not configured, PDCCH monitoring / reception may be performed continuously in the time domain. For example, when DRX is not configured, the PDCCH reception timing (e.g., a time slot with a PDCCHSS) may be configured continuously in the present disclosure. Regardless of whether DRX is configured, PDCCH monitoring may be restricted during time periods configured as measurement gaps.

[0239] Table 13 describes the DRX operation of the UE (in the RRC_CONNECTED state). Referring to Table 13, DRX configuration information is received through high-layer signaling (e.g., RRC signaling), and DRX on / off is controlled by a DRX command from the MAC layer. Once DRX is configured, the UE may perform PDCCH monitoring discontinuously while executing the above-described / proposed procedures and / or methods.

[0240] [Table 8]

[0241]

[0242] MAC-CellGroupConfig includes configuration information required to configure MAC parameters for a cell group. MAC-CellGroupConfig may also include DRX configuration information. For example, when defining DRX, MAC-CellGroupConfig may include the following information.

[0243] -drx-OnDurationTimer value: defines the duration of the start period of the DRX cycle.

[0244] - Value of drx-InactivityTimer: defines the duration of the time period that the UE wakes up after detecting a PDCCH opportunity indicating a PDCCH for initial UL or DL ​​data.

[0245] - Value of drx-HARQ-RTT-TimerDL: defines the duration of the maximum time period after receiving a DL initial transmission until a DL retransmission is received.

[0246] - Value of drx-HARQ-RTT-TimerDL: defines the duration of the maximum time period after receiving a UL initial transmission grant until receiving a UL retransmission grant.

[0247] -drx-LongCycleStartOffset: defines the duration and start time of the DRX cycle.

[0248] -drx-ShortCycle (optional): defines the duration of the short DRX cycle.

[0249] When any one of drx-OnDurationTimer, drx-InactivityTimer, drx-HARQ-RTT-TimerDL and drx-HARQ-RTT-TimerDL is running, the UE performs PDCCH monitoring at each PDCCH opportunity and remains in the awake state.

[0250] The above-mentioned embodiments correspond to the combination of elements and features of the present disclosure in a prescribed form. And, unless explicitly mentioned, each element or feature may be regarded as selective. Each element or feature may be implemented in a form that is not combined with other elements or features. In addition, it is possible to implement the embodiments of the present disclosure by partially combining elements and / or features together. The order of operations described for each embodiment of the present disclosure may be modified. Some configurations or features of an embodiment may be included in another embodiment, or may replace the corresponding configuration or features of another embodiment. And, it is obvious to understand that the embodiment is configured by combining claims that do not have a clear reference relationship in the attached claims, or may be included as a new claim by modification after submitting the application.

[0251] Those skilled in the art will appreciate that the present disclosure may be implemented in other specific forms other than those described herein without departing from the spirit and essential characteristics of the present disclosure. Therefore, the above-described embodiments should be interpreted as being illustrative in all respects, rather than restrictive. The scope of the present disclosure should be determined by the appended claims and their legal equivalents, rather than by the above description, and all changes falling within the meaning and equivalent scope of the appended claims are intended to be covered therein.

[0252] Industrial Applicability

[0253] The present disclosure is applicable to UE, BS or other devices in a wireless mobile communication system.

Claims

1. A method for receiving a signal by a user equipment UE in a wireless communication system, the method comprising the following steps: Receiving configuration information about a transmission configuration indication TCI through high-layer signaling; as well as Receiving downlink control information DCI including a TCI field through a physical downlink control channel PDCCH signal, The UE obtains TCI status information about at least part of the multiple signals based on the TCI field, The plurality of signals include: a first signal set including a first physical downlink shared channel PDSCH signal and a second signal set including a second PDSCH signal, and Among them, at least one code point among the multiple code points of the TCI field is mapped to a combination of first TCI state information about the first signal set including the first PDSCH signal and second TCI state information about the second signal set including the second PDSCH signal.

2. The method according to claim 1, wherein: The first TCI state information is first joint TCI state information which is a union of a first DL TCI of a first downlink DL signal among the first signal set and a first UL TCI of a first uplink UL signal among the first signal set, and The second TCI state information is second joint TCI state information which is a combination of a second DLTCI of a second DL signal in the second signal set and a second UL TCI of a second UL signal in the second signal set.

3. The method according to claim 1, wherein: The first TCI state information indicates at least one of a first DLTCI of a first downlink DL signal among the first signal set or a first ULTCI of a first uplink UL signal among the first signal set, wherein the first DLTCI is separated from the first ULTCI, and The second TCI state information indicates at least one of a second DL TCI of a second DL signal in the second signal set or a second UL TCI of a second UL signal in the second signal set, wherein the second DL TCI is separated from the second UL TCI.

4. The method according to claim 1, wherein: The first signal set includes at least one of a first PDCCH signal on a first control resource set CORESET, 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 or a first sounding reference signal SRS, and The second signal set includes at least one of a second PDCCH signal, a second CSI-RS, a second PUSCH signal, a second PUCCH signal or a second SRS on a second CORESET.

5. The method according to claim 1, wherein: First subset information about at least part of the signals in the first signal set to which the first TCI state information is to be applied and second subset information about at least part of the signals in the second signal set to which the second TCI state information is to be applied are configured to the UE through high-layer signaling.

6. The method according to claim 1, wherein: First quasi-co-located QCL information is commonly applied to the first signal set based on the first TCI state information, and The second QCL information is commonly applied to the second signal set based on the second TCI state information.

7. The method according to claim 1, wherein: The DCI has a DL grant DCI format for downlink DL scheduling.

8. The method according to claim 1, wherein: The at least one code point mapped to the combination of the first TCI state information and the second TCI state information is related to a multi-transmission / reception point M-TRP operation.

9. The method according to claim 1, further comprising the steps of: At least one of the first signal set based on the first TCI state information and the second signal set based on the second TCI state information is sent or received. 10 . A computer-readable recording medium having recorded thereon a program for executing the method according to claim 1 .

11. An apparatus for wireless communication, the apparatus comprising: a memory storing instructions; as well as a processor configured to perform operations by executing said instructions, The operations of the processor include: Receiving configuration information about a transmission configuration indication TCI through a high-layer signaling; and Receiving downlink control information DCI including a TCI field through a physical downlink control channel PDCCH signal, The processor is configured to obtain TCI status information about at least part of the multiple signals based on the TCI field, The plurality of signals include: a first signal set including a first physical downlink shared channel PDSCH signal and a second signal set including a second PDSCH signal, and Among them, at least one code point among the multiple code points of the TCI field is mapped to a combination of first TCI state information about the first signal set including the first PDSCH signal and second TCI state information about the second signal set including the second PDSCH signal.

12. The device according to claim 11, further comprising: a transceiver configured to send or receive wireless signals under the control of the processor, The device is a user equipment UE in a wireless communication system.

13. The device according to claim 11, wherein: The apparatus is an application specific integrated circuit ASIC or a digital signal processor configured to control a user equipment UE.

14. A method for sending a signal by a base station BS in a wireless communication system, the method comprising the following steps: Sending configuration information about the transmission configuration indication TCI to the user equipment UE through high-layer signaling; as well as Sending downlink control information DCI including a TCI field to the UE through a physical downlink control channel PDCCH signal, The BS provides the UE with TCI status information about at least part of the multiple signals based on the TCI field, The plurality of signals include: a first signal set including a first physical downlink shared channel PDSCH signal and a second signal set including a second PDSCH signal, and Among them, at least one code point among the multiple code points of the TCI field is mapped to a combination of first TCI state information about the first signal set including the first PDSCH signal and second TCI state information about the second signal set including the second PDSCH signal.

15. A base station BS for wireless communication, the BS comprising: Transceiver; as well as A processor configured to control the transceiver: Sending configuration information about the transmission configuration indication TCI through the user equipment UE through high-layer signaling; and Sending downlink control information DCI including a TCI field to the UE through a physical downlink control channel PDCCH signal, The processor is configured to provide the UE with TCI status information about at least part of the multiple signals based on the TCI field, The plurality of signals include: a first signal set including a first physical downlink shared channel PDSCH signal and a second signal set including a second PDSCH signal, and Among them, at least one code point among the multiple code points of the TCI field is mapped to a combination of first TCI state information about the first signal set including the first PDSCH signal and second TCI state information about the second signal set including the second PDSCH signal.

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