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

Abstract

According to at least one embodiment disclosed in the present specification, a method by which a terminal transmits a signal in a wireless communication system comprises: receiving a Media Access Control (MAC) Control Element (CE) related to transmission based on at least eight uplink antenna ports; receiving, through a physical downlink control channel (PDCCH), DCI for uplink scheduling including a transmission precoding matrix index (TPMI) field; and transmitting the uplink signal on the basis of the DCI, in which, on the basis of the DCI for transmission on the basis of at least eight uplink antenna ports, a set of precoding matrices is determined by means of the MAC CE, and a precoding matrix for the uplink signal from the set of precoding matrices determined by the MAC CE is determined on the basis of the index value of the TPMI field.

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 Solutions

[0007] According to one aspect, a method for transmitting a signal by a user equipment (UE) in a wireless communication system may include: receiving a medium access control (MAC) control element (CE) related to transmission based on at least eight uplink antenna ports, receiving downlink control information (DCI) for uplink scheduling including a transmission precoding matrix index (TPMI) field through a physical downlink control channel (PDCCH), and transmitting an uplink signal based on the DCI. Based on the DCI for transmission based on at least eight uplink antenna ports, a precoding matrix set may be determined through the MAC CE, and a precoding matrix for the uplink signal may be determined from the precoding matrix set determined through the MAC CE based on an index value in the TPMI field.

[0008] The MAC CE may include a Transmission Rank Indicator (TRI) field. A precoding matrix set may be determined based on the TRI.

[0009] The precoding matrix set may be a codebook, and one of a plurality of codebooks configured for the UE may be determined through the MAC CE.

[0010] The precoding matrix set determined by the MAC CE may be a subset of the precoding matrices included in one codebook. Multiple subsets of precoding matrices included in one codebook may be configured for the UE through higher layer signaling. One of the multiple subsets may be determined by the MAC CE.

[0011] The MAC CE may include information on a codebook subsampling pattern used to determine a precoding matrix set.

[0012] The precoding matrix set determined by the MAC CE may be used after a predetermined time offset from a hybrid automatic repeat request acknowledgement (HARQ-ACK) for the MAC CE. From reception of the MAC CE until application of the precoding matrix set, a default precoding matrix set may be used.

[0013] According to another aspect, a processor-readable recording medium recording a program for executing the above-described method of transmitting a signal may be provided.

[0014] According to another aspect, a UE for performing the above method of sending a signal may be provided.

[0015] According to another aspect, a processing device for controlling a UE to perform the above method of transmitting a signal may be provided.

[0016] According to another aspect, a method for receiving a signal by a base station (BS) in a wireless communication system may include: sending a MAC CE related to reception based on at least eight uplink antenna ports, sending a DCI including a TPMI field through a PDCCH, and receiving an uplink signal based on the DCI. Based on the DCI for reception based on at least eight uplink antenna ports, a precoding matrix set may be determined through the MAC CE, and a precoding matrix for the uplink signal may be determined from the precoding matrix set determined through the MAC CE based on an index value in the TPMI field.

[0017] According to another aspect, a processor-readable recording medium recording a program for executing the above-mentioned method of receiving a signal may be provided.

[0018] According to another aspect, a BS for performing the above-mentioned method of receiving a signal may be provided.

[0019] Beneficial Effects

[0020] According to the present disclosure, wireless signal transmission and reception can be efficiently performed in a wireless communication system.

[0021] 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

[0022] 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.

[0023] Figure 2 Shows the radio frame structure.

[0024] Figure 3 A resource grid showing time slots.

[0025] Figure 4 An exemplary mapping of physical channels in time slots is shown.

[0026] Figure 5 An exemplary PDSCH and acknowledgement / negative acknowledgement (ACK / NACK) transmission process is shown.

[0027] Figure 6 An exemplary PUSCH transmission process is shown.

[0028] Figure 7 An example of a channel state information (CSI) related process is shown.

[0029] Figure 8 Multiple transmit and receive point (TRP) transmissions are shown.

[0030] Fig. 9 An exemplary 8-Tx UL transmission is illustrated.

[0031] Fig.10 An exemplary UL transmission from a UE to multiple TRPs is illustrated.

[0032] Fig.11 An implementation example of a method of operating a UE in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0033] Fig.12 An implementation example of a method of operating a BS in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0034] Figures 13 to 16 is a diagram showing an example of a communication system 1 and a wireless device applicable to the present disclosure.

[0035] Fig.17 is a diagram showing an example of a discontinuous reception (DRX) operation applicable to the present disclosure. DETAILED DESCRIPTION

[0036] 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.

[0037] 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).

[0038] For the sake of brevity, 3GPP NR is mainly described, but the technical concept of the present disclosure is not limited thereto.

[0039] 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.

[0040] 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.

[0041] Figure 1 Physical channels used in the 3GPP NR system and a general signal transmission method using the same are shown.

[0042] 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.

[0043] After the initial cell search, the UE may acquire more specific system information by receiving a physical downlink control channel (PDCCH) and receiving a physical downlink shared channel (PDSCH) based on information of the PDCCH in step S102.

[0044] 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).

[0045] 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.

[0046] 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.

[0047] 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.

[0048] [Table 1]

[0049] <![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

[0050] N slot symb : Number of symbols in a time slot

[0051] N frame,u slot : Number of time slots in a frame

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

[0053] 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.

[0054] [Table 2]

[0055]

[0056] 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.

[0057] 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).

[0058] 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.

[0059] 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.

[0060] The individual physical channels are described in more detail below.

[0061] 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).

[0062] 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.

[0063] 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.

[0064] -controlResourceSetId: CORESET related to SS

[0065] -monitoringSlotPeriodicityAndOffset: PDCCH monitoring periodicity (time slot) and PDCCH monitoring offset (time slot)

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

[0067] -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)

[0068] *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.

[0069] Table 3 shows the characteristics of each SS.

[0070] [Table 3]

[0071]

[0072] Table 4 shows the DCI format transmitted on the PDCCH.

[0073] [Table 4]

[0074]

[0075] 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).

[0076] 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.

[0077] 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.

[0078] PUCCH transmits uplink control information (UCI). UCI includes the following information.

[0079] -SR (Scheduling Request): Information used to request UL-SCH resources.

[0080] -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.

[0081] -CSI (Channel State Information): Feedback information of DL channels. Multiple Input Multiple Output (MIMO) related feedback information includes RI and PMI.

[0082] 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).

[0083] [Table 5]

[0084]

[0085] 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.

[0086] 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)).

[0087] 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.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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 PUSCH is sent with a DFT-s-OFDM waveform, the UE sends PUSCH with transform precoding. For example, when transform precoding is not possible (e.g., disabled), the UE may send PUSCH with a CP-OFDM waveform, and when transform precoding is possible (e.g., enabled), the UE may send PUSCH with a CP-OFDM or DFT-s-OFDM waveform. PUSCH transmission may be dynamically scheduled by a UL grant in a 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. Table 6 is an excerpt from UL precoding and its codebook as defined in NR standard document TS38.211.

[0092] [Table 6]

[0093]

[0094]

[0095]

[0096]

[0097]

[0098]

[0099]

[0100] 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.

[0101] - Frequency domain resource assignment: indicates the RB set assigned to PDSCH.

[0102] - 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.

[0103] -PDSCH-to-HARQ_feedback timing indicator: indicates K1.

[0104] -HARQ process number (4 bits): indicates the HARQ process ID of the data (eg, PDSCH or TB).

[0105] - PUCCH resource indicator (PRI): indicates a PUCCH resource to be used for UCI transmission among a plurality of PUCCH resources in a PUCCH resource set.

[0106] 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 5 Based 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.

[0107] 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.

[0108] 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.

[0109] 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-wise) logical AND operation on the A / N bits of multiple TBs.

[0110] 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.

[0111] 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.

[0112] 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 media 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.

[0113] 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.

[0114] - Frequency domain resource assignment: indicates the RB set assigned to PUSCH.

[0115] -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.

[0116] 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.

[0117] CSI related operations

[0118] Figure 7 An example of a CSI-related process is shown.

[0119] 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.

[0120] -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.

[0121] - 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).

[0122] - 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.

[0123] -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.

[0124] -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 MAC 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.

[0125] 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).

[0126] 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.

[0127] 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.

[0128] Quasi-isotope (QCL)

[0129] 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.

[0130] A list of multiple transmission configuration indicator (TCI) state configurations can be configured in the UE through the high-level parameter PDSCH-Config, and each TCI state is linked to the QCL configuration parameters between one or two DL reference signals and the DM-RS port of the PDSCH. The QCL may include qcl-Type1 for the first DL RS and qcl-Type2 for the second DL RS. The QCL type may correspond to one of the following.

[0131] - "QCL-TypeA": {Doppler shift, Doppler spread, average delay, delay spread}

[0132] - "QCL-TypeB": {Doppler shift, Doppler spread}

[0133] - "QCL-TypeC": {Doppler shift, average delay}

[0134] - "QCL-TypeD": {spatial Rx parameters}

[0135] Operations related to multiple transmit and receive points (M-TRP)

[0136] Figure 8 A multi-TRP (M-TRP) transmission is shown. Figure 8 (a), a group of layers that transmit the same codeword (CW) (or transport block TB) corresponds to different TRPs. Figure 8 (b) , different CWs are sent through layer groups of different TRPs. In this case, it can be assumed that the TBs corresponding to CW#1 and CW#2 in the figure are the same. In other words, CW#1 and CW#2 mean that the same TB is converted into different CWs through channel coding of different TRPs, etc. Therefore, it can be regarded as an example of repeated transmission of the same TB. Figure 8 In the case of (b), Figure 8 Compared with (a), there may be a disadvantage that the coding rate corresponding to TB is higher. However, Figure 8 (b) has the advantage that the coding rate can be adjusted by indicating different redundancy version (RV) values ​​of coded bits generated from the same TB, or the modulation order of each CW can be adjusted according to the channel environment.

[0137] according to Figure 8 (a) and Figure 8 The method shown in (b) repeatedly sends the same TB through different layer groups. In addition, since each layer group is sent by a different TRP / panel, the probability of the UE successfully receiving the data can be increased. This is called the M-TRP URLLC transmission method based on spatial division multiplexing (SDM). Layers belonging to different layer groups are sent through DMRS ports belonging to different DMRS code division multiplexing (CDM) groups.

[0138] Although the above-mentioned M-TRP related content is described based on the SDM method using different layers, it can be extended and applied to the FDM method based on different frequency domain resources (e.g., RB / PRB sets) and / or the TDM method based on different time domain resources (e.g., time slots, symbols, sub-symbols, etc.).

[0139] Overhead reduction for 8-Tx UL codebook

[0140] Recently, a method of reducing the overhead of i) SRS resource indication (SRI) and / or transmitter precoder matrix indication (TPMI) for codebook-based transmission and ii) SRI for non-codebook-based transmission from a UE supporting UL transmission through 8 antenna ports (8TX UE) has been discussed. It is also necessary to specify whether to use separate fields or a single field and whether to use an existing field or define a new field for indication.

[0141] The present disclosure discloses an embodiment of a method for reducing the overhead of UL transmission indications (e.g., DCI payloads) when a multi-panel or multi-antenna UE performs 8Tx UL transmissions to one or more TRPs in a codebook-based or non-codebook-based manner.

[0142] First, UL transmission according to the current NR standard will be briefly described. UL transmission is divided into codebook-based UL transmission and non-codebook-based UL transmission. In codebook-based UL transmission, the UE sends an SRS (e.g., non-precoded SRS) to the BS, the BS obtains UL channel information through the SRS and indicates codebook information suitable for UL data transmission (e.g., TRI and TPMI and / or SRI) to the UE based on the UL channel information, and the UE performs PUSCH transmission using the indicated information. On the other hand, in non-codebook-based UL transmission, the UE sends an SRS (e.g., precoded SRS) to the BS through UL beamforming, and the BS measures the SRS and indicates to the UE through the SRI field the combination of SRSs to be used for PUSCH transmission (e.g., UL beam combining).

[0143] In codebook-based UL transmission, the bit field size is variably determined (e.g., 4, 5, or 6 bits) based on the maximum rank information and codebook subset configured for the UE RRC, and in non-codebook-based UL transmission, the bit field size is also variably determined based on the L max Value and N SRS The value variably determines the bit field size.

[0144] Since the maximum number of ports supported for legacy UL transmission is 4, the legacy UL transmission has a smaller codebook size and a smaller number of SRS combinations compared to 8Tx proposed in the present disclosure.

[0145] In the case of 8Tx or more UL transmission, a method of indicating SRI and / or TRI and / or TPMI for effective UL transmission will be proposed below. Specifically, when the number of transmission antennas of the UE increases to 8, 8Tx UL transmission is proposed, which can be particularly used for UE types such as fixed wireless access (FWA), customer premise equipment (CPE), vehicles and industrial equipment.

[0146] (1) Proposal 1

[0147] According to an embodiment, in codebook-based UL transmission, a transmit rank indicator (TRI) field and a transmit precoding matrix indicator (TPMI) field are indicated separately, and the TRI field is indicated by MAC-CE. Based on the TRI value indicated by MAC-CE, the TPMI field is interpreted differently.

[0148] Compared to the legacy operation in which TRI and TPMI are jointly encoded and indicated by one field of DCI, in scheme 1, the TRI field and the TPMI field are separately indicated by different channels. When using this method, the TRI field can be indicated by a MAC-CE or DCI different from the TPMI, and the size of the TPMI field in the DCI indicating the TPMI is determined based on the TRI with the largest number of TPMIs among the TRIs for the respective rank levels. For example, assuming that for the 8Tx UL codebook, the number of TPMIs for each rank is given as Rank1:16, Rank2:20, Rank3:12, Rank4:8, Rank5:1, Rank6:1, Rank7:1, and Rank8:1. Then, the 3-bit TRI field is indicated by the MAC-CE or other DCI, the size of the TPMI field is determined to be 5 bits (to include 20 of Rank2), and the TPMI is indicated by the DCI. When the TRI indicates 5 to 8, one TPMI is included in the above example, and therefore the decoding of the field can be discarded or the field is considered to be reserved, thereby reducing the decoding complexity of the UE. In other words, when the number of TPMIs indicated by the separately indicated TRI is 1, decoding of the TPMI field may be discarded or the TPMI field may be regarded as reserved.

[0149] The TPMI value is based on the TRI value indicated by the most recent successfully received MAC-CE or DCI. Alternatively, the TRI value may be applied starting from the time after the TRI value indicated by the most recent MAC-CE or DCI is successfully received and the HARQ-ACK for it is sent to the BS. For example, in the case where a new TRI value (e.g., new TRI=2, previous TRI value=1) is received at time n and a HARQ-ACK for it is sent at time n+4, when TPMI is indicated at time n+2 by another DCI, TPMI may be interpreted as TRI=1, and TPMI received after time n+4 may be interpreted as TRI=2. When the initially received TRI value cannot be detected and therefore the TPMI should be interpreted without a TRI value, a default TRI value may be specified / set, for example, a default TRI=1.

[0150] Fig. 9 An implementation example of UL transmission according to Proposal 1 is shown.

[0151] refer to Fig. 9 , the UE reports the UE capabilities to the network (A05). The UE capabilities may include information about the maximum number of UL transmission antennas supported by the UE. For example, the UE may report that it can use up to 8 transmission antennas for UL transmission.

[0152] The network may send the UL transmission configuration to the UE through higher layer signaling based on the UE capability (A10). The UL transmission configuration may include configuration information for 8-Tx antenna UL transmission as described above.

[0153] The network may send first transmission rank information (TRI) to the UE via MAC CE (A15). The first TRI may indicate at least one (or at least some subsamples) in the 8-Tx codebook. For ease of description, it is assumed that the first codebook is indicated by the first TRI.

[0154] The network may send a first DCI including a first TPMI to the UE (A20). The first TPMI may indicate one of the precoding matrices included in the first codebook indicated by the first TRI. For ease of description, it is assumed that the first TPMI indicates the first precoding matrix in the first codebook.

[0155] The UE may send a UL signal based on the first TRI and the first TPMI (A25).For example, the UE may perform a first PUSCH transmission through 8 antennas based on a first precoding matrix in a first codebook.

[0156] The network may send a second DCI including a second TPMI to the UE (A30). The second TPMI may indicate one of the precoding matrices included in the first codebook indicated by the first TRI. For ease of description, it is assumed that the second TPMI indicates the second precoding matrix in the first codebook.

[0157] The UE may transmit a UL signal based on the first TRI and the second TPMI (A25).For example, the UE may perform a second PUSCH transmission through 8 antennas based on the second precoding matrix in the first codebook.

[0158] (2) Proposal 2

[0159] According to an embodiment, in codebook-based UL transmission, multiple codebook subsets are configured based on RRC or a prior agreement between the BS and the UE, and the subset to be used is indicated through MAC-CE. Then, the RI / TPMI to be used is indicated through DCI, and the UE can use this information to send PUSCH.

[0160] In Proposal 2, TRI and TPMI are configured separately and indicated through different channels. In this case, TPMI has a dependency on TRI, which may lead to error propagation problems. To further alleviate this and reduce the load of DCI, multiple codebook subsets (e.g., TPMI groups for each rank or rank group) can be configured through RRC or prior agreement, and the subset to be used is indicated through MAC-CE. For example, assume that Group 1: (TRI=1, TPMI=16)+(TRI=2, TPMI=20), Group 2: (TRI=3, TPMI=12)+(TRI=4, TPMI=8), Group 3: (TRI=5, TPMI=1)+(TRI=6, TPMI=1), Group 4: (TRI=7, TPMI=1)+(TRI=8, TPMI=1) are configured. (TRI=X, TPMI=Y) means that the TRI value is X and there are Y TPMIs for TRI. The TPMI size is determined based on the maximum sum of the TPMIs in the group, and in the above example, based on group 1, the TPMI size is determined to be 6 bits (16+20=36). In the above example, the group to be selected can be indicated by 2 bits of MAC-CE or other DCI. For example, when group 2 is selected, for TRI=3 and TRI=4, the 6-bit code point indicated by the general TPMI field is used to indicate a total of 12+8 TPMIs. The 20 code points in the 6 bits can be mapped to the LSB or MSB, and the remaining code points can be processed as reserved. Although the above example is designed to include TPMIs corresponding to two TRIs that are equal in each group, each group can have a different number of TRIs and / or TPMIs. The number of configured / indicated groups and / or how the TRI / TPMI is mapped to each group can be configured by RRC or prior agreement.

[0161] Similar to Proposal 1, the TRI / TPMI value is based on the group id (or codebook subset) value indicated by the most recent successfully received MAC-CE or DCI. Alternatively, the group id (or codebook subset) value may be applied after the group id (or codebook subset) value indicated by the most recent MAC-CE or DCI is successfully received and the HARQ-ACK for it is sent to the BS. For example, in the case where a new group id (or codebook subset) value is received at time n (e.g., new group = 2 and previous group value = 1) and a HARQ-ACK for it is sent at time n+4, when TRI / TPMI is indicated by another DCI at time n+2, TRI / TPMI is interpreted as TPMI within group = 1, and TRI / TPMI received after time n+4 may be interpreted as TPMI within group = 2. When the detection of the initially received group value fails and the TRI / TPMI needs to be interpreted without a group value, a default group value, e.g., default group = 1, may be specified / set.

[0162] The above codebook subsets may be set / configured based on the legacy consistency capability of the UE (eg, non / partial / full consistency among Tx antenna ports).

[0163] In addition, in Proposal 2, the codebook subset configuration may include a different number of TPMIs for each rank in each group. For example, Group 1: (TRI = 1, TPMI = 16) + (TRI = 2, TPMI = 16) and Group 2: (TRI = 1, TPMI = 12) + (TRI = 2, TPMI = 20) may be configured. The number of TPMIs for each specific rank may be set differently for each group. That is, the codebook subsets may be configured to overlap the TPMIs between groups.

[0164] Proposal 2-1

[0165] In order to reduce the DCI overhead in codebook-based UL transmission, the codebook subsampling mode may be pre-configured, or the codebook subsampling mode may be configured and indicated through RRC / MAC-CE.

[0166] Codebook subsampling can be used to indicate a combination of TRI / TPMIs that are not indicated by DCI or indicated by DCI in a preset codebook to reduce the overhead of TRI / TPMI indication. For example, assume an 8Tx codebook including Rank1: 16 and Rank2: 20. For example, when indicating a mode of selecting only even / odd numbered TPMIs, the UE may assume a new codebook subset including 8 TPMIs for RANK1 and 10 TPMIs for RANK2, and interpret the TRI / TPMI indication based on this. Codebook subsampling may be configured / indicated based on rank, or may be configured based on rank groups or ranks in common.

[0167] (3) Proposal 3

[0168] According to an embodiment, when the TRI field and the TPMI field are separately configured / indicated in codebook-based UL transmission, even if the maximum rank = 8, the size of the TRI field is fixed to 2 bits, and the accurate TRI can be interpreted from the TRI field in combination with another field.

[0169] In the above example, for example, when the maximum rank = 8, it is desirable to set the size of the TRI field to 3 bits. However, when 8 layers are supported, the codeword layer mapping may be changed. For example, when one TB is indicated, the TRI ranges from 1 to 4, and when two TBs are indicated, the TRI ranges from 5 to 8. Therefore, it is possible to determine whether the range of TRI is from 1 to 4 or from 5 to 8 in combination with the field indicating the number of TBs. For example, a field (1 bit) can be introduced that explicitly indicates the number of TBs to be sent by the UE, or the number of TBs sent can be implicitly known from the number of MCS, NDI, or RV fields, and this information can be used to identify the indicated TRI range. For example, when two MCS fields are configured, the UE can identify that two TBs are sent, and thus the indicated TRI range is 5 to 8, and the value of TRI is indicated in 2 bits.

[0170] (4) Proposal 4

[0171] For non-codebook based UL transmission, multiple SRS combinations can be configured through RRC or prior agreement between the BS and the UE, and the combination to be used is indicated through MAC-CE. Then, the SRS combination to be used is finally indicated through DCI, and the UE can use this information to send PUSCH.

[0172] Similar to Proposal 1 and Proposal 2, the group for the actual SRS combination can be configured by MAC-CE, and in Proposal 4, the combination to be selected within the group configured by MAC-CE can be indicated / configured by DCI. For example, group 1=8 pick 1+8 pick 2+8 pick 3, group 2=8 pick 4+8 pick 5+8 pick 6, and group 3=8 pick 6+8 pick 7+8 pick 8 are indicated, and when group 1 is indicated by MAC-CE or other DCI, the combination can be indicated by DCI from 8+28+56=92. In Proposal 4, the size of the SRI field in the DCI is also determined based on the number of combinations in the group with the largest number of combinations among the groups that can be configured by MAC-CE. The number of configured / indicated groups and / or how the combinations are mapped to the respective groups can be configured by RRC or prior agreement.

[0173] (5) Proposal 5

[0174] In the codebook-based UL or the non-codebook-based UL, the maximum rank value or L configured conventionally through RRC may be updated through MAC-CE. max and / or N SRS value.

[0175] As described above, according to the maximum rank value, L max Value and / or N SRSThe value changes the size of the TRI / TPMI field and the size of the SRI field in the DCI. In Proposal 5, it is proposed to update the parameters, maximum rank, L max and / or N SRS , and the size of the field in the DCI is changed based on the value indicated by MAC-CE. However, when the decoding of the parameter indicated by MAC-CE fails, the assumption of the field size between the BS and the UE may be ambiguous. Therefore, when the time point after the HARQ-ACK for the successful reception of the value updated based on the MAC-CE is sent to the BS is n, it can be agreed that the new updated value is applied from time n+X, and the pre-agreed or BS-configured X value can be indicated as 0 or a positive value. In Proposal 5, when L is reduced by MAC CE max (or N SRS ) value, there may be ambiguity as to which SRS resource to use to configure the SRI field among up to 8 SRS resources configured in the non-codebook based SRS resource set. For this reason, it can be considered as a rule basis, for example, to use the L from the SRS resource with the smallest ID / largest ID max ( / N SRS ) resources are mapped to the SRI field, or L is mapped to the SRI field in the order of the SRS resources sent. max ( / N SRS ) resources are mapped to the SRI field. Alternatively, the BS may indicate to the UE / configure the mode / mapping to be used for the UE through RRC.

[0176] Furthermore, according to recent standard discussions, one of the following schemes may be used as SRS configuration for non-codebook UL of 8Tx UE.

[0177] -Alt1: Configure an SRS resource set, which includes up to 8 single-port SRS resources.

[0178] -Alt2: Configure up to 2 SRS resource sets, each SRS resource set includes up to 4 single-port SRS resources.

[0179] -Alt3: supports both Alt.1 and Alt.2.

[0180] When Alt 3 is supported, the codebook subset / SRS combination to be used may be different depending on the SRS resource configuration scheme. That is, the codebook subset / SRS combination used in Alt1 and the codebook subset / SRS combination used in Alt2 may be configured / indicated differently. This is because the transmission method assumed by the UE, for example, S-TRP transmission or M-TRP transmission, may be different depending on the SRS configuration scheme, and therefore the codebook or SRS combination used may be different. For example, Schemes 1 to 5 may be applied differently depending on the SRS resource configuration scheme.

[0181] The above solutions can be used alone or in combination.

[0182] Fig.10 The diagram illustrates the (single) DCI based sending / receiving process in a multiple TRP scenario.

[0183] Specifically, Fig.10 The figure illustrates the signaling between the network side (e.g., TRP 1 and TRP 2) and the UE in the case of multiple TRPs (i.e., M-TRP or multiple cells. In the following, all TRPs can be replaced by cells) to which the proposed method can be applied. The UE / network side is only an example and can be used Figures 14 to 16 The various devices described in are substituted. Fig.10 It is only used for convenience of description and does not limit the scope of the present disclosure. In addition, depending on the situation and / or configuration, it can be skipped. Fig.10 In addition, although Fig.10 Figure 1 shows an example of M-TRP transmission based on a single DCI, but Fig.10 The method described in can be extended to M-TRP transmission based on multiple DCIs. In addition, Fig.10 The operations on the network side and UE can be based on the above-mentioned UL sending / receiving operations / multi-TRP related operations.

[0184] refer to Fig.10, for the convenience of description, consider the signaling between two TRPs and the UE. However, it is obvious that the signaling method can be extended to the signaling between multiple TRPs and multiple UEs. In the following description, the network side can be a BS including multiple TRPs or a cell including multiple TRPs. For example, an ideal / non-ideal backhaul can be established between TRP 1 and TRP 2 included in the network side. In addition, although the following description is given in the context of multiple TRPs, it can also be extended to transmission through multiple panels. In addition, the operation of receiving a signal from TRP1 / TRP2 by the UE in the present disclosure can also be interpreted / described as (or can also be) an operation of receiving a signal from the network side (via / using TRP1 / 2) by the UE, and the operation of sending a signal to TRP1 / TRP2 by the UE in the present disclosure can also be interpreted / described as (or can also be) an operation of sending a signal to the network side (via / using TRP1 / 2) by the UE, and vice versa.

[0185] In the present disclosure, BS may be a general term for an object that performs data transmission and reception with a UE. For example, a BS may be a concept including one or more transmission points (TPs), one or more transmission and reception points (TRPs), and the like. In addition, the TP and / or TRP may include a panel or a transmission and reception unit of the BS. Although the following description is given in the context of "TRP", "TRP" may be replaced with terms such as a panel, an antenna array, a cell (e.g., a macro cell / small cell / pico cell), a TP, and a BS (gNB) as described above. In addition, as described above, a TRP may be identified by information about a CORESET group (or CORESET pool) (e.g., an index or ID). For example, when a UE is configured to perform transmission and reception with multiple TRPs (or cells), this may mean configuring multiple CORESET groups (or CORESET pools) for the UE. The configuration of such a CORESET group (or CORESET pool) may be performed by higher layer signaling (e.g., RRC signaling).

[0186] Specifically, Fig.10 The figure shows the signaling when the UE receives a single DCI in the M-TRP case (or M-cell case. In the following, all TRPs can be replaced by cells / panels, or when multiple CORESETs ( / CORESET groups) are configured through one TRP, they can also be assumed to be M-TRPs). Figure 1 In the figure, it is assumed that TRP 1 is the representative TRP for sending DCI.

[0187] The UE may send the UE capabilities to the network side via / using TRP 1 (and / or TRP 2) (M205). For example, the UE capabilities may include information such as whether the UE supports the above-mentioned proposed methods / UE capabilities related to the supported operations.

[0188] For example, UE capabilities may include the number of supported antenna ports (# of supported antenna ports) / number of ports per panel / number of panels that can transmit simultaneously / coherence capability (e.g., nonCoherent, partialNonCoherent, fullCoherent) / full power transmission capability / supported full Tx mode / supported TPMI groups / port switching capability / TX chain related information / whether M-TRP transmission is supported / number of SRS resources that can be transmitted / multiplexing information (e.g., TDM / FDM / SDM). This step can be skipped when the UE capability information is predefined / pre-agreed.

[0189] For example, in step M205, UE( Figures 14 to 16 100 / 200) to the network side ( Fig.14 The operation of sending UE capabilities can be described as follows Figures 14 to 16 For example, see Fig.14 , at least one processor 102 can control at least one transceiver 106 and / or at least one memory 104 to send UE capabilities, and at least one transceiver 106 can send the UE capabilities to the network side.

[0190] The UE may receive configuration information (M210) related to transmission and reception based on multiple TRPs from the network side through / using TRP 1 (and / or TRP 2). For example, the configuration information may include information related to the configuration of the network side (i.e., TRP configuration) / resource information (resource allocation) related to transmission and reception based on multiple TRPs / system information (SI) / scheduling information / PUSCH-Config (TS 38.331 PUSCH Config). For example, the configuration information may include information related to CB subset restriction / CB subsampling (e.g., CB subset restriction / CB subsampling mode / bitmap). The configuration information may be sent via higher layer signaling (e.g., RRC signaling or MAC-CE). In addition, when the configuration information is predefined or preconfigured, this step may be skipped. For example, the information required for the operations in the above-mentioned proposed method may be included in the configuration information.

[0191] For example, in the above step M210, UE( Figures 14 to 16 100 / 200) from the network side ( Fig.14The operation of receiving configuration information related to transmission and reception based on multiple TRPs can be described as follows Figures 14 to 16 For example, refer to Fig.14 , at least one processor 102 can control at least one transceiver 106 and / or at least one memory 104 to receive configuration information related to sending and receiving based on multiple TRPs, and at least one transceiver 106 can receive configuration information related to sending and receiving based on multiple TRPs from the network side.

[0192] The UE may receive DCI from the network side through / using TRP 1 (M215). The DCI may be sent through a control channel (e.g., PDCCH). For example, the DCI may include information for scheduling UL transmission (e.g., UL scheduling information) / precoding-related information. For example, the precoding-related information may include information about SRI / TPMI / TRI / MCS. For example, the DCI may be DCI format 0_1 ​​or DCI format 0_0. For example, PUSCH scheduling for each of a plurality of cells may be performed simultaneously through the DCI.

[0193] For example, it is contemplated to indicate / configure TRI / TPMI / SRI through transmission / reception of multiple panels / ports, as described in the method proposed above. For example, a TRI for one of multiple TRPs (e.g., a first TRP (e.g., which can be determined based on an index such as a CoresetID / TCI state)) can be indicated, while the same TRP value is assumed to be applied to other TRPs. For example, a common / individual TRI for each TRP can be indicated by a higher layer configuration, and the TPMI can be indicated by DCI. For example, considering the channel environment, the rank of other TRPs can be configured to be less than the rank of the TRP in the optimal channel environment as a reference rank, or a predefined value can be used as the rank of other TRPs. For example, the TPMI for a specific rank combination can be indicated. For example, the size of the TPMI field can be determined based on the maximum of the number of TPMIs for each rank. For example, a rank for one (e.g., a first TRP (e.g., which can be determined based on an index such as a CoresetID / TCI state)) can be indicated, the indication of the rank of other TRPs can be omitted, and an SRS resource combination can be indicated for transmissions with corresponding ranks.

[0194] For example, CB subset restriction / CB subsampling may be configured based on DCI. For example, CB subsets may be configured based on an index (e.g., odd / even) of TPMI. For example, subsampling may be applied only to a specific rank. For example, subsampling may be performed based on in-phase between ports / port groups.

[0195] In addition, for example, the network side can perform a process of acquiring information about the UL channel state (ie, UL CSI acquisition) with the UE before scheduling UL transmission. For example, information about the channel state between the UE and the network side can be acquired based on the aforementioned CSI-related operation.

[0196] For example, in the above step M215, UE( Figures 14 to 16 100 / 200) from the network side ( Fig.14 The operation of receiving DCI of 100 / 200) may be performed by the following description Figures 14 to 16 For example, refer to Fig.14 , at least one processor 102 may control at least one transceiver 106 and / or at least one memory 104 to receive DCI, and at least one transceiver 106 may receive DCI from the network side.

[0197] The UE may send data 1 to the network side by / using TRP 1 (M220-1). In addition, the UE may send data 2 to the network side by / using TRP2 (M220-2). The data (e.g., data 1 and data 2) may be sent through a data channel (e.g., PUSCH). In addition, step M220-1 and step M220-2 may be performed simultaneously, or one of them may be performed before the other. For example, data 1 / data 2 may have been precoded and include an RS (e.g., DMRS) for data decoding. For example, the transmission of data 1 and / or data 2 may be performed based on the method proposed above.

[0198] For example, in the above steps M220-1 / M220-2, the UE ( Figures 14 to 16 100 / 200) to the network side ( Fig.14 The operation of sending data 1 / data 2 can be described as follows Figures 14 to 16 For example, referring to 14, at least one processor 102 may control at least one transceiver 106 and / or at least one memory 104 to send data 1 / data 2, and at least one transceiver 106 may send data 1 / data 2 to the network side.

[0199] As described above, the network side / UE signaling and operations described above may be performed by the devices described below (eg, Figures 14 to 16 For example, the network side (eg, TRP 1 / TRP 2) may correspond to the first wireless device, and the UE may correspond to the second wireless device, and in some cases, the opposite situation may also be considered.

[0200] For example, the above network side / UE signaling and operations can be done by Figures 14 to 16At least one processor (e.g., 102 or 202) is processed, and the above network side / UE signaling and operations can be used for operation Figures 14 to 16 Instructions / programs (eg, instructions or executable code) of at least one processor (eg, 102 or 202) are stored in a memory (eg, Fig.14 in at least one memory (e.g., 104 or 204)).

[0201] Fig.11 An implementation example of a method of operating a UE in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0202] refer to Fig.11 , the UE can receive MAC CE associated with transmission based on at least 8 UL antenna ports. (B05).

[0203] The UE may receive DCI for UL scheduling including the TPMI field through the PDCCH ( B10 ).

[0204] The UE may send a UL signal based on the DCI (B15).

[0205] Based on the DCI for transmission based on at least 8 UL antenna ports, a precoding matrix set may be determined through the MAC CE. A precoding matrix for a UL signal may be determined from the precoding matrix set determined through the MAC CE based on an index value in the TPMI field.

[0206] The MAC CE may include a TRI field. The precoding matrix set may be determined based on the TRI.

[0207] The precoding matrix set may be a codebook, and one of a plurality of codebooks configured for the UE may be determined through the MAC CE.

[0208] The precoding matrix set determined by the MAC CE may be a subset of the precoding matrices included in one codebook. Multiple subsets of precoding matrices included in one codebook may be configured for the UE through higher layer signaling. One of the multiple subsets may be determined by the MAC CE.

[0209] The MAC CE may include information on a codebook subsampling pattern used to determine a precoding matrix set.

[0210] The precoding matrix set determined by the MAC CE may be used after a predetermined time offset from the HARQ-ACK for the MAC CE. From the reception of the MAC CE until the precoding matrix set is applied, a default precoding matrix set may be used.

[0211] Fig.12An example of a method of operating a BS in a wireless communication system according to an embodiment of the present disclosure is illustrated.

[0212] refer to Fig.12 , the BS may send a MAC CE (C05) related to reception based on at least 8 UL antenna ports.

[0213] The BS may transmit DCI for UL scheduling including the TPMI field through the PDCCH (C10).

[0214] The BS may receive a UL signal based on the DCI (C15).

[0215] Based on the DCI for reception based on at least 8 UL antenna ports, a precoding matrix set may be determined through the MAC CE. A precoding matrix for a UL signal may be determined / indicated from the precoding matrix set determined through the MAC CE based on an index value in the TPMI field.

[0216] The MAC CE may include a TRI field. The precoding matrix set may be determined based on the TRI.

[0217] The precoding matrix set may be a codebook, and one of a plurality of codebooks configured for the UE may be determined / indicated through the MAC CE.

[0218] The precoding matrix set determined by the MAC CE may be a subset of the precoding matrices included in one codebook. Multiple subsets of the precoding matrices included in one codebook may be configured for the UE through higher layer signaling. One of the multiple subsets may be determined / indicated through the MAC CE.

[0219] The MAC CE may include information on a codebook subsampling pattern for determining / indicating a precoding matrix set.

[0220] The precoding matrix set determined by the MAC CE may be used after a predetermined time offset from the HARQ-ACK for the MAC CE. From the reception of the MAC CE until the precoding matrix set is applied, a default precoding matrix set may be used.

[0221] Fig.13 A communication system 1 applied to the present disclosure is shown.

[0222] refer to Fig.13, 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.

[0223] The wireless devices 100a to 100f may be connected to the network 300 via the BS 200. 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.

[0224] 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.

[0225] Fig.14 A wireless device suitable for use with the present disclosure is shown.

[0226] refer to Fig.14 , 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.13 {wireless device 100x and BS 200} and / or {wireless device 100x and wireless device 100x}.

[0227] 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.

[0228] 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.

[0229] 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.

[0230] 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.

[0231] 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.

[0232] 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.

[0233] Fig.15 Another example of a wireless device applied to the present disclosure is shown. The wireless device can be used according to the usage / service (reference Fig.13 ) are implemented in various forms.

[0234] refer to Fig.15 , the wireless devices 100 and 200 may correspond to Fig.14The 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.14 One or more processors 102 and 202 and / or one or more memories 104 and 204. For example, the transceiver 114 may include Fig.14 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 send 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.

[0235] 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.13 100a), vehicles ( Fig.13 100b-1 and 100b-2), XR devices ( Fig.13 100c), handheld device ( Fig.13 100d), household appliances ( Fig.13 100e), IoT devices ( Fig.13 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.13 400), BS( Fig.13 200), network nodes, etc. The wireless device can be used in a mobile or fixed location according to the usage example / service.

[0236] exist Fig.15In 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.

[0237] Fig.16 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.

[0238] refer to Fig.16 , 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.15 Block 110 / 130 / 140.

[0239] 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 acquire 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.

[0240] 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.

[0241] Fig.17 is a diagram illustrating a DRX operation of a UE according to an embodiment of the present disclosure.

[0242] 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.

[0243] refer to Fig.17 , 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 PDCCH SS) 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 PDCCH SS) 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.

[0244] The DRX configuration information is received through high-layer signaling (eg, 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.

[0245] 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.

[0246] 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.

[0247] Industrial Applicability

[0248] The present disclosure is applicable to UE, BS or other devices in a wireless mobile communication system.

Claims

1. A method for sending a signal by a user equipment (UE) in a wireless communication system, the method comprising: receiving a medium access control (MAC) control element (CE) associated with transmissions based on at least eight uplink antenna ports; receiving downlink control information (DCI) for uplink scheduling including a transmission precoding matrix index (TPMI) field through a physical downlink control channel (PDCCH); as well as sending an uplink signal based on the DCI, wherein a precoding matrix set is determined by the MAC CE based on the DCI for the transmission based on at least eight uplink antenna ports, and Wherein, based on the index value in the TPMI field, a precoding matrix for the uplink signal is determined from the precoding matrix set determined by the MAC CE.

2. The method according to claim 1, wherein: The MAC CE includes a Transmission Rank Indicator (TRI) field, and The precoding matrix set is determined based on TRI.

3. The method according to claim 1, wherein: The set of precoding matrices is a codebook, and Among them, one of multiple codebooks configured for the UE is determined through the MAC CE.

4. The method according to claim 1, wherein: The precoding matrix set determined by the MAC CE is a subset of precoding matrices included in a codebook.

5. The method according to claim 4, wherein: configuring, for the UE through higher layer signaling, a plurality of subsets of the precoding matrices included in the one codebook, and Among them, one of the multiple subsets is determined by the MAC CE.

6. The method according to claim 1, wherein: The MAC CE includes information on a codebook subsampling pattern used to determine the precoding matrix set.

7. The method according to claim 1, wherein: The precoding matrix set determined by the MAC CE is used after a predetermined time offset from a hybrid automatic repeat request acknowledgement (HARQ-ACK) for the MAC CE.

8. The method according to claim 7, wherein: From the start of reception of the MAC CE to the application of the precoding matrix set, a default precoding matrix set is used. 9 . A computer-readable recording medium recording a program for executing the method according to claim 1 .

10. A device for wireless communication, the device comprising: a memory configured to store instructions; as well as a processor configured to perform operations by executing the instructions, The operations of the processor include: receiving a medium access control (MAC) control element (CE) associated with transmissions based on at least eight uplink antenna ports; receiving downlink control information (DCI) for uplink scheduling including a transmission precoding matrix index (TPMI) field through a physical downlink control channel (PDCCH); and sending an uplink signal based on the DCI, wherein a precoding matrix set is determined by the MAC CE based on the DCI for the transmission based on at least eight uplink antenna ports, and Wherein, based on the index value in the TPMI field, a precoding matrix for the uplink signal is determined from the precoding matrix set determined by the MAC CE.

11. The apparatus according to claim 10, further comprising: Transceiver, The device is a user equipment (UE) operating in a wireless communication system.

12. The device according to claim 10, wherein: The device is a processing device configured to control a user equipment (UE) operating in a wireless communication system.

13. A method for receiving a signal by a base station (BS) in a wireless communication system, the method comprising: sending a medium access control (MAC) control element (CE) associated with transmission based on at least eight uplink antenna ports; Sending downlink control information (DCI) including a transport precoding matrix index (TPMI) field through a physical downlink control channel (PDCCH); as well as receiving an uplink signal based on the DCI, wherein, based on the DCI for the reception based on at least eight uplink antenna ports, a precoding matrix set is determined by the MAC CE, and Wherein, based on the index value in the TPMI field, a precoding matrix for the uplink signal is determined from the precoding matrix set determined by the MAC CE.

14. A computer-readable recording medium recording a program for executing the method according to claim 13.

15. A base station (BS) for wireless communication, the BS comprising: a memory configured to store instructions; as well as a processor configured to perform operations by executing the instructions, The operations of the processor include: sending a medium access control (MAC) control element (CE) associated with transmission based on at least eight uplink antenna ports; transmitting downlink control information (DCI) including a transport precoding matrix index (TPMI) field through a physical downlink control channel (PDCCH); and receiving an uplink signal based on the DCI, wherein, based on the DCI for the reception based on at least eight uplink antenna ports, a precoding matrix set is determined by the MAC CE, and Wherein, based on the index value in the TPMI field, a precoding matrix for the uplink signal is determined from the precoding matrix set determined by the MAC CE.

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