Method for transmitting phase tracking reference signal for simultaneous transmission across multiple panels in wireless communication system and apparatus therefor

Abstract

The present disclosure relates to a method performed by a user equipment (UE) in a wireless communication system. Specifically, the method comprises the steps of: receiving downlink control information (DCI) for simultaneous transmission (STxMP) across a plurality of panels from a base station (BS); and transmitting a first PT-RS on a first PT-RS port and a second PT-RS on a second PT-RS port to the BS on the basis of association information between a Phase Tracking (PT)-Reference Signal (RS) port and a Demodulation (DM)-RS port included in the DCI, wherein first information of association information between the PT-RS port and the DM-RS port indicates a first DM-RS port associated with the first PT-RS port among the DM-RS ports corresponding to at least one of a first sounding reference signal resource indicator (SRI) and first precoding information, and second information of association information between the PT-RS port and the DM-RS port indicates a second DM-RS port associated with the second PT-RS port among the DM-RS ports corresponding to at least one of the second SRI and the second precoding information.

Description

Technical Field

[0001] The present disclosure relates to a wireless communication system and more particularly to a method and apparatus for transmitting a phase tracking reference signal (PT-RS) for simultaneous transmission (STxMP) across multiple panels in a wireless communication system. Background Art

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

[0003] Technical issues

[0004] Based on the above description, the present disclosure relates to a method and apparatus for transmitting a phase tracking reference signal (PT-RS) for simultaneous transmission (STxMP) across multiple panels in a wireless communication system.

[0005] Those skilled in the art to which the embodiments pertain will appreciate that the objectives that can be achieved using the embodiments are not limited to the above specific descriptions, and the above objectives and other objectives will be more clearly understood from the following detailed description.

[0006] Technical Solution

[0007] According to one aspect of the present disclosure, a method performed by a user equipment (UE) in a wireless communication system is provided. The method includes: receiving downlink control information (DCI) for simultaneous transmission (STxMP) across multiple panels from a base station (BS), and sending a first phase tracking (PT)-reference signal (RS) on a first PT-RS port and a second PT-RS on a second PT-RS port to the BS based on PT-RS port to demodulation (DM)-RS port association information included in the DCI. The first information of the PT-RS port to DM-RS port association information indicates a first DM-RS port associated with the first PT-RS port among DM-RS ports corresponding to at least one of a first sounding reference signal resource indicator (SRI) or first precoding information, and the second information of the PT-RS port to DM-RS port association information indicates a second DM-RS port associated with the second PT-RS port among DM-RS ports corresponding to at least one of a second SRI or second precoding information.

[0008] According to another aspect of the present disclosure, a UE in a wireless communication system is provided. The UE includes at least one transceiver, at least one processor, and at least one computer memory, which is operably connected to the at least one processor and stores instructions that, when executed, cause the at least one processor to perform operations. The operations include: receiving a DCI for STxMP from a BS; and sending a first PT-RS on a first PT-RS port and a second PT-RS on a second PT-RS port to the BS based on the PT-RS port to DM-RS port association information included in the DCI. The first information of the PT-RS port to DM-RS port association information indicates a first DM-RS port associated with the first PT-RS port among the DM-RS ports corresponding to at least one of the first SRI or the first precoding information, and the second information of the PT-RS port to DM-RS port association information indicates a second DM-RS port associated with the second PT-RS port among the DM-RS ports corresponding to at least one of the second SRI or the second precoding information.

[0009] According to another aspect of the present disclosure, a processing device in a wireless communication system is provided. The processing device includes: at least one processor; and at least one computer memory, which is operably connected to the at least one processor and stores instructions, which, when executed, cause the at least one processor to perform operations for a UE. The operations include: receiving a DCI for STxMP from a BS; and sending a first PT-RS on a first PT-RS port and a second PT-RS on a second PT-RS port to the BS based on the PT-RS port to DM-RS port association information included in the DCI. The first information of the PT-RS port to DM-RS port association information indicates a first DM-RS port associated with the first PT-RS port among the DM-RS ports corresponding to at least one of the first SRI or the first precoding information, and the second information of the PT-RS port to DM-RS port association information indicates a second DM-RS port associated with the second PT-RS port among the DM-RS ports corresponding to at least one of the second SRI or the second precoding information.

[0010] According to another aspect of the present disclosure, a computer-readable storage medium is provided. The computer-readable storage medium stores at least one program code, which includes instructions that, when executed, cause at least one processor to perform operations for a UE. The operations include: receiving a DCI for STxMP from a BS; and sending a first PT-RS on a first PT-RS port and a second PT-RS on a second PT-RS port to the BS based on the PT-RS port to DM-RS port association information included in the DCI. The first information of the PT-RS port to DM-RS port association information indicates a first DM-RS port associated with the first PT-RS port among the DM-RS ports corresponding to at least one of the first SRI or the first precoding information, and the second information of the PT-RS port to DM-RS port association information indicates a second DM-RS port associated with the second PT-RS port among the DM-RS ports corresponding to at least one of the second SRI or the second precoding information.

[0011] According to another aspect of the present disclosure, a method performed by a BS in a wireless communication system is provided. The method includes: sending a DCI for STxMP to a UE; and receiving a first PT-RS on a first PT-RS port and a second PT-RS on a second PT-RS port to the BS based on the PT-RS port to DM-RS port association information included in the DCI. The first information of the PT-RS port to DM-RS port association information indicates a first DM-RS port associated with the first PT-RS port among the DM-RS ports corresponding to at least one of the first SRI or the first precoding information, and the second information of the PT-RS port to DM-RS port association information indicates a second DM-RS port associated with the second PT-RS port among the DM-RS ports corresponding to at least one of the second SRI or the second precoding information.

[0012] According to another aspect of the present disclosure, a BS in a wireless communication system is provided. The BS includes at least one transceiver, at least one processor, and at least one computer memory, which is operably connected to the at least one processor and stores instructions that, when executed, cause the at least one processor to perform operations. The operations include: sending a DCI for STxMP to a UE; and receiving a first PT-RS on a first PT-RS port and a second PT-RS on a second PT-RS port to the BS based on the PT-RS port to DM-RS port association information included in the DCI. The first information of the PT-RS port to DM-RS port association information indicates a first DM-RS port associated with the first PT-RS port among the DM-RS ports corresponding to at least one of the first SRI or the first precoding information, and the second information of the PT-RS port to DM-RS port association information indicates a second DM-RS port associated with the second PT-RS port among the DM-RS ports corresponding to at least one of the second SRI or the second precoding information.

[0013] Preferably, the UE may receive information indicating that the maximum number of PT-RSs is 2 from the BS.

[0014] Preferably, the first information is a first bit of the PT-RS port to DM-RS port association information, and the second information is a second bit of the PT-RS port to DM-RS port association information.

[0015] Preferably, the UE receives information about a DM-RS port corresponding to at least one of the first SRI or the first precoding information and information about a DM-RS port corresponding to at least one of the second SRI or the second precoding information from the BS.

[0016] Preferably, the first DM-RS port is associated with a first PUSCH sent on a first panel, the second DM-RS port is associated with a second PUSCH sent on a second panel, and the first PUSCH and the second PUSCH are sent to the BS in the same time and frequency resources.

[0017] The above-mentioned solutions are only some of the examples of the present disclosure, and those skilled in the art can derive and understand various examples reflecting the technical features of the present disclosure from the following detailed description.

[0018] Beneficial Effects

[0019] According to the present disclosure, wireless signal transmission and reception can be efficiently performed in a wireless communication system.

[0020] Those skilled in the art will appreciate that the technical effects that can be achieved using the present disclosure are not limited to the contents specifically described above, and the above and other technical effects that can be achieved by the present disclosure will be more clearly understood from the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The accompanying drawings are provided together with the detailed description to help understand the embodiments. However, the technical features of the embodiments are not limited to specific drawings, and the features disclosed in each drawing can be combined with each other to form new embodiments. The reference numerals in each drawing represent structural elements.

[0022] Figure 1 Illustrated are physical channels used in a 3rd Generation Partnership Project (3GPP) system as an example of a wireless communication system and a general signal transmission method using the physical channels.

[0023] Figure 2 The radio frame structure is shown.

[0024] Figure 3 A resource grid of time slots is illustrated.

[0025] Figure 4 illustrates an exemplary mapping of physical channels in time slots;

[0026] Figure 5 An exemplary process of transmitting a physical downlink shared channel (PDSCH) and acknowledgement / negative acknowledgement (ACK / NACK) is illustrated.

[0027] Figure 6 An exemplary physical uplink shared channel (PUSCH) transmission procedure is illustrated.

[0028] Figure 7 is a flow chart illustrating a phase tracking reference signal (PT-RS) for simultaneous transmission (STxMP) across multiple panels according to the present disclosure.

[0029] Figures 8 to 11 The diagram is applicable to the communication system (1) and wireless device of the present disclosure. DETAILED DESCRIPTION

[0030] The technology described herein can be used in various wireless access systems such as code division multiple access (CDMA), frequency division multiple access (FDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), single carrier frequency division multiple access (SC-FDMA), etc. CDMA can be implemented 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 IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802.20, Evolved UTRA (E-UTRA), etc. UTRA is part of Universal Mobile Telecommunications System (UMTS). 3GPP LTE is part of Evolved UMTS (E-UMTS) using E-UTRA. 3GPP LTE adopts OFDMA for downlink and SC-FDMA for uplink. LTE-A is the evolution of 3GPP LTE. 3GPP NR (New Radio or New Radio Access Technology) is the evolved version of 3GPP LTE / LTE-A / LTE-A pro.

[0031] As more and more communication devices require greater communication capacity when sending and receiving signals, there is a demand for improved mobile broadband communications from legacy radio access technologies. Therefore, communication systems that take into account services / UEs that are sensitive to reliability and latency are being discussed. The next generation radio access technology that takes into account enhanced mobile broadband communications, massive machine type communications (MTC), and ultra-reliable and low-latency communications (URLLC) may be referred to as new radio access technologies (RATs) or new radios (NRs).

[0032] Although the present disclosure is mainly described in the context of 3GPP NR for clarity of description, the technical concept of the present disclosure is not limited to 3GPP NR.

[0033] In this specification, the expression "setting" can be replaced with the expression "configuration / configuration", and the two can be used interchangeably. In addition, conditional expressions (e.g., "if ~~", "in the case of ~~", "when ~~", etc.) can be replaced with the expression "based on the ~~" or "in the state / condition of ~~". In addition, the operation or SW / HW configuration of the user equipment (UE) / base station (BS) performed according to the satisfaction of the condition can be inferred / understood. In addition, when the process of the receiving (or transmitting) side can be inferred / understood from the process of the transmitting (or receiving) side in the signal transmission / reception between the wireless communication device (e.g., BS and UE), its description can be omitted. For example, signal determination / generation / encoding / transmission on the transmitting side can be understood as signal monitoring reception / decoding / determination on the receiving side. In addition, when it is said that the UE performs (or does not perform) a specific operation, this can also be interpreted as the meaning that the BS expects / assumes that the UE performs a specific operation (or expects / assumes that the UE does not perform a specific operation) and operates. In addition, when it is said that the BS performs (or does not perform) a specific operation, this can also be interpreted as the meaning that the UE expects / assumes that the BS performs a specific operation (or expects / assumes that the BS does not perform a specific operation) and operates. In addition, the identification and indexing of each part, embodiment, example, option, method, plan, etc. in the following description are for the convenience of description and should not be interpreted as meaning that each part forms an independent disclosure or that each part should be implemented separately. In addition, unless there is an explicitly conflicting / contradictory description when describing each chapter, embodiment, example, option, method, plan, etc., it can be inferred / interpreted that at least some of them can be implemented in combination, or can be implemented by omitting at least some of them.

[0034] In a wireless communication system, a UE receives information from a 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.

[0035] Figure 1 is a diagram illustrating physical channels in a 3GPP NR system and a signal transmission method using the physical channels.

[0036] When powered on or when the UE initially enters a cell, the UE performs an initial cell search involving synchronization with the BS in step S101. For the initial cell search, the UE receives a synchronization signal block (SSB). The SSB includes a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). The UE synchronizes with the BS and acquires information such as a cell identifier (ID) based on the PSS / SSS. The UE can then receive broadcast information from the cell on the PBCH. At the same time, the UE can check the downlink channel status by receiving a downlink reference signal (DL RS) during the initial cell search.

[0037] 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 .

[0038] Subsequently, in order to complete the connection with the eNB, the UE may perform a random access procedure with the eNB (S103 to S106). In the random access procedure, the UE may send a preamble on a physical random access channel (PRACH) (S103), and may receive a PDCCH and a random access response (RAR) to the preamble on a PDSCH associated with the PDCCH (S104). The UE may send a physical uplink shared channel (PUSCH) by using the scheduling information in the RAR (S105), and perform a contention resolution procedure including receiving a PDCCH signal and a PDSCH signal corresponding to the PDCCH signal (S106).

[0039] After the above process, the UE may receive PDCCH and / or PDSCH from the eNB (S107), and send a physical uplink shared channel (PUSCH) and / or a physical uplink control channel (PUCCH) to the eNB (S108), which is a general DL and UL signal transmission process. Specifically, the UE receives downlink control information (DCI) on the PDCCH. The control information sent from the UE to the eNB is collectively referred to as uplink control information (UCI). UCI includes hybrid automatic repeat and request acknowledgement / negative acknowledgement (HARQACK / 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 through PUCCH, it can be sent through PUSCH when control information and business data should be sent at the same time. In addition, UCI can be sent irregularly through PUSCH by request / instruction of the network.

[0040] Figure 2The structure of the radio frame is shown in the figure. The radio frame can be used for UL transmission and DL transmission in NR. The length of the radio frame is 10ms and can be defined by two 5ms half frames. HF can include five 1ms subframes. The subframe can be divided into one or more time slots, and the number of time slots in the SF can be determined according to the subcarrier spacing (SCS). Each time slot can include 12 or 14 OFDM (A) symbols according to the cyclic prefix (CP). In the case of normal CP (NCP), each time slot can include 14 symbols, and in the case of extended CP (ECP), each time slot can include 12 symbols. Here, the symbol can be an OFDM symbol (or CP-OFDM symbol) or an SC-FDMA symbol (or DFT-s-OFDM symbol).

[0041] Table 1 below lists the number of symbols N per time slot according to SCS configuration μ in the NCP case slot symb , the number of time slots per frame N frame,u slot and the number of time slots per subframe N subframe,u slot .

[0042] [Table 1]

[0043] u <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot ]]> 0 14 10 1 1 14 20 2 2 14 40 4 3 14 80 8 4 14 160 16

[0044] The following Table 2 lists the number of symbols per time slot, the number of time slots per frame, and the number of time slots per subframe according to SCS in the ECP case.

[0045] [Table 2]

[0046] u <![CDATA[N slot symb ]]> <![CDATA[N frame,u slot ]]> <![CDATA[N subframe,u slot ]]> 2 12 40 4

[0047] 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.

[0048] In the NR system, OFDM parameter sets (e.g., SCS) can 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) consisting of the same number of symbols (referred to as a time unit (TU) for simplicity) can be configured differently among the 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).

[0049] Figure 3An exemplary resource grid for the duration of a time slot is illustrated. A time slot includes a plurality of symbols in the time domain. For example, in the case of normal CP, a time slot includes 14 symbols, and in the case of extended CP, a time slot includes 12 symbols. A carrier includes a plurality of subcarriers in the frequency domain. A resource block (RB) is defined as a plurality of (e.g., 12) consecutive subcarriers in the frequency domain. A bandwidth part (BWP) may be defined as a plurality of physical RBs (PRBs) in the frequency domain and corresponds to a parameter set (e.g., SCS, CP length, etc.). A carrier may include up to N (e.g., 5) BWPs. Data communication may be performed in active BWPs, and only one BWP may be activated for a UE. Each element of the resource grid may be referred to as a resource element (RE) and is mapped to a composite symbol.

[0050] Figure 4 An example of mapping physical channels in a time slot is shown. PDCCH can be sent in the DL control region, and PDSCH can be sent in the DL data region. PUCCH can be sent in the UL control region, and PUSCH can be sent in the UL data region. GP provides a time gap for switching from transmission mode to reception mode or from reception mode to transmission mode at the BS and UE. Some symbols of the DL to UL switching time point within a subframe can be configured as GP.

[0051] Each physical channel is described in more detail below.

[0052] PDCCH delivers DCI. For example, PDCCH (i.e., DCI) may carry information about the transport 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 the DL-SCH, information about resource allocation of higher layer control messages such as RAR sent on the PDSCH, transmit power control commands, information about activation / release of configured scheduling, etc. DCI includes a cyclic redundancy check (CRC). Depending on the owner or purpose of the PDCCH, the CRC is masked by various identifiers (IDs) (e.g., radio network temporary identifier (RNTI)). For example, if the PDCCH is for a specific UE, the CRC is masked by the UE ID (e.g., cell RNTI (C-RNTI)). If the PDCCH is for a paging message, the CRC is masked by the paging RNTI (P-RNTI). If the PDCCH is for system information (e.g., system information block (SIB)), the CRC is masked by the system information RNTI (SI-RNTI). When the PDCCH is used for RAR, the CRC is masked by the random access RNTI (RA-RNTI).

[0053] Depending on the aggregation level (AL), the PDCCH includes 1, 2, 4, 8 or 16 control channel elements (CCEs). CCE is a logical allocation unit for providing PDCCH with a specific code rate according to the radio channel state. CCE includes six resource element groups (REGs). REG is defined as one OFDM symbol and one (P)RB. PDCCH is transmitted in a control resource set (CORESET). CORESET is defined as a set of REGs with a given parameter set (e.g., SCS, CP length, etc.). Multiple CORESETs for one UE may overlap with each other in the time / frequency domain. CORESET can be configured by system information (e.g., Master Information Block (MIB)) or UE-specific higher layer (e.g., Radio Resource Control (RRC) layer) signaling. Specifically, the number of RBs and the number of OFDM symbols (up to 3) included in the CORESET can be configured by higher layer signaling.

[0054] For PDCCH reception / detection, the UE monitors PDCCH candidates. PDCCH candidates represent the CCEs that the UE should monitor for PDCCH detection. Depending on the AL, each PDCCH candidate is defined as 1, 2, 4, 8 or 16 CCEs. Monitoring includes (blind) decoding of PDCCH candidates. The set of PDCCH candidates monitored by the UE is defined as the PDCCH search space (SS). The SS includes a common search space (CSS) or a UE-specific search space (USS). The UE can acquire DCI by monitoring PDCCH candidates in one or more SSs configured by MIB or higher layer signaling. Each CORESET is associated with one or more SSs, and each SS is associated with one COREST. The SS can be defined based on the following parameters.

[0055] - controlResourceSetId: indicates the CORESET associated with the SS

[0056] - surveillanceSlotPeriodicityAndOffset: indicates the PDCCH monitoring periodicity (in time slots) and the PDCCH monitoring period offset (in time slots)

[0057] - surveillanceSymbolsWithinSlot: indicates the PDCCH monitoring symbols within a slot (e.g., the first symbol of CORESET)

[0058] - nrofCandidates: AL = {1, 2, 4, 8, 16} indicates the number of PDCCH candidates (one of 0, 1, 2, 3, 4, 5, 6 and 8)

[0059] * An occasion (eg, time / frequency resource) in which a PDCCH candidate is to be monitored is defined as a PDCCH (monitoring) occasion. One or more PDCCH (monitoring) occasions may be configured in one time slot.

[0060] Table 3 illustrates the characteristics of each SS type.

[0061] [Table 3]

[0062] type Search Space RNTI Usage Type 0 - PDCCH public SI-RNTI on the primary cell SIB decoding Type 0A-PDCCH public SI-RNTI on the primary cell SIB decoding Type 1 - PDCCH public RA-RNTI or TC-RNTI on the primary cell Decoding of Msg2 and Msg4 in RACH Type 2 - PDCCH public P-RNTI on the primary cell Paging decoding Type 3 - PDCCH public INT-RNTI, SFI-RNTI, TPC-PUSCH-RNTI, TPC-PUCCH-RNTI, TPC-SRS-RNTI, C-RNTI, MCS-C-RNTI, or CS-RNTI UE-specific UE-specific C-RNTI, or MCS-C-RNTI, or CS-RNTI User-specific PDSCH decoding

[0063] Table 4 shows the DCI format transmitted on the PDCCH.

[0064] [Table 4]

[0065] DCI format usage 0_0 PUSCH Scheduling in a Cell 0_1 PUSCH Scheduling in a Cell 1_0 Scheduling of PDSCH in a cell 1_1 Scheduling of PDSCH in a cell 2_0 Notify a group of UEs of the timeslot format 2_1 Inform the UE of a set of PRBs and OFDM symbols where the UE can assume that no transmission is expected for the UE 2_2 Transmission of TPC commands for PUCCH and PUSCH 2_3 A set of TPC commands for SRS transmission transmitted by one or more UEs

[0066] DCI format 0_0 may be used to schedule TB-based (or TB-level) PUSCH, and DCI format 0_1 ​​may be used to schedule TB-based (or TB-level) PUSCH or code block group (CBG)-based (or CBG-level) PUSCH. DCI format 1_0 may be used to schedule TB-based (or TB-level) PDSCH, and DCI format 1_1 may be used to schedule TB-based (or TB-level) PDSCH or CBG-based (or CBG-level) PDSCH (DL grant DCI). DCI format 0_0 / 0_1 may be referred to as UL grant DCI or UL scheduling information, and DCI format 1_0 / 1_1 may be referred to as DL grant DCI or DL ​​scheduling information. DCI format 2_0 is used to deliver dynamic slot format information (e.g., dynamic SFI) to the UE, and DCI format 2_1 may be used to deliver DL preemption information to the UE. DCI format 2_0 and / or DCI format 2_1 may be transmitted to UEs within the group through a group-common PDCCH, which is a PDCCH delivered to UEs defined as a group.

[0067] DCI format 0_0 and DCI format 1_0 may be referred to as fallback DCI formats, while DCI format 0_1 ​​and DCI format 1_1 may be referred to as non-fallback DCI formats. In the fallback DCI format, the DCI size / field configuration remains the same regardless of the UE configuration. In contrast, in the non-fallback DCI format, the DCI size / field configuration varies depending on the UE configuration.

[0068] The PDSCH carries DL data (e.g., DL-SCH transport block (DL-SCH TB)), and modulation schemes such as quadrature phase shift keying (QPSK), 16 quadrature amplitude modulation (16 QAM), 64 QAM, 256 QAM, etc. are applied to the PDSCH. The TB is encoded to generate a codeword. The PDSCH can carry up to two codewords. Each codeword can be subjected to scrambling and modulation mapping, and the modulation symbol generated from the codeword can be mapped to one or more layers. Each layer is mapped to a resource together with a demodulation reference signal (DMRS), generated as an OFDM symbol signal, and transmitted through a corresponding antenna port.

[0069] PUCCH carries UCI. UCI includes the following.

[0070] -SR (Scheduling Request): Information used to request UL-SCH resources

[0071] -HARQ (Hybrid Automatic Repeat Request) -ACK (Acknowledgement): A response to a DL data packet (e.g., codeword) on the PDSCH. This indicates whether the DL data packet has been successfully received. One HARQ-ACK bit can be sent in response to a single codeword, and two HARQ-ACK bits can be sent in response to two codewords. HARQ-ACK responses include positive ACK (ACK for short), negative ACK (NACK), DTX, or NACK / DTX. HARQ-ACK is used interchangeably with HARQ ACK / NACK and ACK / NACK.

[0072] -CSI (Channel State Information): Feedback information for DL ​​channels. Multiple-input multiple-output (MIMO) related feedback information includes RI and PMI.

[0073] Table 5 illustrates an example of a PUCCH format. Depending on PUCCH transmission duration, they may be classified into short PUCCH (formats 0 and 2) and long PUCCH (formats 1, 3, and 4).

[0074] [Table 5]

[0075] PUCCH format <![CDATA[Length in OFDM symbol N PUCCH symb > Number of bits usage other 0 1 - 2 ≤2 HARQ, SR Sequence selection 1 4 - 14 ≤2 HARQ, [SR] Sequence Modulation 2 1 - 2 >2 HARQ, CSI, [SR] CP-OFDM 3 4 - 14 >2 HARQ, CSI, [SR] DFT-s-OFDM (without UE multiplexing) 4 4 - 14 >2 HARQ, CSI, [SR] DFT-s-OFDM (formerly DFT OCC)

[0076] PUCCH format 0 carries up to 2 bits of UCI and is mapped and transmitted based on a sequence. Specifically, the UE transmits one of multiple sequences through the PUCCH of PUCCH format 0 to send specific UCI to the BS. The UE transmits the PUCCH of PUCCH format 0 in the PUCCH resource for the corresponding SR configuration only when transmitting a positive SR.

[0077] PUCCH format 1 carries up to 2 bits of UCI, and the modulation symbol 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 that do not carry modulation symbols (ie, transmitted in time division multiplexing (TDM)).

[0078] PUCCH format 2 carries more than two bits of UCI, and the modulation symbols are sent with DMRS in frequency division multiplexing (FDM). DMRS are located in symbol indexes #1, #4, #7, and #10 within a given RB with a density of 1 / 3. Pseudo-noise (PN) sequences are used for DMRS sequences. Frequency hopping can be activated for 2-symbol PUCCH format 2.

[0079] In PUCCH format 3, UEs do not multiplex within the same PRB and deliver UCI with more than two bits. In other words, PUCCH resources of PUCCH format 3 do not include OCC. Modulation symbols are transmitted in TDM together with DMRS.

[0080] PUCCH format 4 supports multiplexing up to four UEs within the same physical RS and carries UCI with more than two bits. In other words, the PUCCH resources of PUCCH format 3 include OCC. The modulation symbols are transmitted in TDM together with the DMRS.

[0081] At least one of the one or more cells configured for the UE may be configured for PUCCH transmission. At least one primary cell may be configured 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 more cells. The PUCCH cell group may be referred to as a PUCCH group for short. PUCCH transmission may be configured not only for the primary cell, but also for the SCell, and the primary cell belongs to the primary PUCCH group, while the PUCCH-SCell configured for PUCCH transmission belongs to the secondary PUCCH group. The PUCCH on the primary cell may be used for cells belonging to the primary PUCCH group, and the PUCCH on the PUCCH-SCell may be used for cells belonging to the secondary PUCCH group.

[0082] The PUSCH carries UL data (e.g., UL-SCH TB) and / or UCI, and is transmitted based on a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) waveform or a discrete Fourier transform spread orthogonal frequency division multiplexing (DFT-s-OFDM) waveform. When the PUSCH is transmitted based on the DFT-s-OFDM waveform, the UE transmits the PUSCH by applying transform precoding. For example, when transform precoding is not possible (e.g., transform precoding is disabled), the UE may transmit the PUSCH based on the CP-OFDM waveform, and when transform precoding is possible (e.g., transform precoding is enabled), the UE may transmit the PUSCH based on the CP-OFDM waveform or the DFT-s-OFDM waveform. PUSCH transmission may be dynamically scheduled by a UL grant in the DCI, or semi-statically scheduled based on higher layer (e.g., RRC) signaling (and / or layer 1 (L1) signaling (e.g., PDCCH)). PUSCH transmission can be performed in a codebook-based or non-codebook-based manner.

[0083] Figure 5 Figure ACK / NACK transmission process. 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 to PDSCH offset K0 and PDSCH to HARQ-ACK report offset K1. For example, DCI format 1_0 or DCI format 1_1 may include the following information.

[0084] - Frequency domain resource assignment: indicates the RB set assigned to the PDSCH.

[0085] - Time domain resource assignment: Indicates K0 (e.g., slot offset), the starting position of PDSCH in slot #n+K0 (e.g., OFDM symbol index), and the length of PDSCH (e.g., number of OFDM symbols)

[0086] -PDSCH to HARQ_feedback timing indicator: indicates K1.

[0087] -HARQ process number (4 bits): Indicates the HARQ process ID used for data (e.g., PDSCH or TB)

[0088] -PUCCH resource indicator (PRI): indicates the PUCCH resource to be used for UCI transmission among multiple PUCCH resources in a PUCCH resource set.

[0089] Subsequently, the UE may receive PDSCH from slot #(n+K0) according to the scheduling information in slot #n. After completing PDSCH reception in slot #n1 (where n+K0≤n1), the UE may send UCI via PUCCH in slot #(n1+K1). UCI may include a HARQ-ACK response to the PDSCH. Figure 5 In the description, for convenience, it is assumed that the SCS for PDSCH and the SCS for PUCCH are the same, and time slot #n1=time slot #n+K0, but the present disclosure is not limited thereto. When the SCSs are different, K1 can be indicated / interpreted based on the SCS of PUCCH.

[0090] When the PDSCH is configured to transmit up to one TB, the HARQ-ACK response may include one bit. When the PDSCH is configured to transmit up to two TBs, the HARQ-ACK response may include two bits if spatial bundling is not configured, and may include one bit if spatial bundling is configured. When the HARQ-ACK transmission time for multiple PDSCHs is specified as slot #(n+K1), the UCI transmitted in slot #(n+K1) includes HARQ-ACK responses for multiple PDSCHs.

[0091] Whether the UE should perform spatial bundling on the HARQ-ACK responses may be configured for each cell group (e.g., via RRC / higher layer signaling). For example, spatial bundling may be configured separately for each HARQ-ACK response sent over the PUCCH and / or each HARQ-ACK response sent over the PUSCH.

[0092] Spatial bundling can be supported when the maximum number of TBs (or codewords) that can be received at one time (or schedulable by one DCI) in the corresponding serving cell is 2 (or greater) (for example, when the higher layer parameter maxNrofCodeWordsScheduledByDCI corresponds to 2 TBs). At the same time, more than 4 layers can be used for 2-TB transmission, and up to 4 layers can be used for 1-TB transmission. Therefore, when spatial bundling is configured for the corresponding cell group, spatial bundling can be performed on the serving cells of the cell group that can schedule more than 4 layers. On the serving cell, a UE that wants to send a HARQ-ACK response through spatial bundling can generate a HARQ-ACK response by performing a bitwise logical AND operation on the A / N bits for multiple TBs.

[0093] For example, assuming that a UE receives a DCI that schedules two TBs and receives the two TBs through a PDSCH based on the DCI, the UE that performs spatial bundling can generate a single A / N bit by performing a logical AND operation on a first A / N bit for a first TB and a second A / N bit for 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 any one of the TBs is NACK, the UE reports a NACK bit value to the BS.

[0094] 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 for one TB and a bit value of 1. As a result, the UE reports the A / N bits for one TB to the BS as is.

[0095] There are multiple parallel DL HARQ processes for DL ​​transmission in the BS / UE. Multiple parallel HARQ processes allow DL transmission to be performed continuously while the BS waits for HARQ feedback on the successful or failed reception of the previous DL transmission. Each HARQ process is associated with a HARQ buffer of the Media Access Control (MAC) layer. Each DL HARQ process manages state variables such as the number of transmissions of the MAC physical data block (PDU) in the buffer, the HARQ feedback for the MAC PDU in the buffer, and the current redundancy version. Each HARQ process is identified by a HARQ process ID.

[0096] Figure 6 An exemplary PUSCH transmission process is shown in FIG. Figure 6 , the UE may detect the PDCCH in time slot #n. The PDCCH may include UL scheduling information (eg, DCI format 0_0 or DCI format 0_1). DCI format 0_0 and DCI format 0_1 ​​may include the following information.

[0097] - Frequency domain resource assignment: indicates the RB set allocated to PUSCH.

[0098] -Time domain resource assignment: Specify the slot offset K2, which indicates the starting position (e.g., symbol index) and length (e.g., number of OFDM symbols) of the PUSCH in the slot. The starting symbol and length of the PUSCH can be indicated by the start and length indicator value (SLIV) or separately.

[0099] 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.

[0100] QCL (quasi co-located)

[0101] The two antenna ports are quasi-co-located when the channel characteristics of one antenna port can be derived from the channel of another antenna port. 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.

[0102] The UE may be configured with a list of multiple TCI-State configurations via a higher layer parameter PDSCH-Config. Each TCI-State is associated with a QCL configuration parameter between one or two DL RS and the DMRS port of the PDSCH. The QCL may include qcl-Type1 for the first DS RS and qcl-Type2 for the second DL RS. The QCL type may correspond to one of the following types.

[0103] - "QCL-TypeA": {Doppler shift, Doppler spread, average delay, delay spread}

[0104] - "QCL-TypeB": {Doppler shift, Doppler spread}

[0105] - "QCL-TypeC": {Doppler shift, average delay}

[0106] - "QCL-TypeD": {spatial Rx parameters}

[0107] Beam Management (BM)

[0108] BM is a series of procedures for acquiring and maintaining BS (or Transmit and Receive Point (TRP)) beams and / or UE beams that can be used for DL ​​and UL transmission / reception. BM may include the following procedures and terms.

[0109] -Beam measurement: The BS or UE measures the characteristics of the received beamforming signal.

[0110] -Beam determination: The BS or UE selects its transmit (Tx) beam / receive (Rx) beam.

[0111] - Beam scanning: Covering the spatial domain by using Tx beams and / or Rx beams in a predetermined manner during a predetermined time interval.

[0112] -Beam reporting: The UE reports information about the beamformed signal based on beam measurements.

[0113] The BM process may be divided into (1) a DL BM process using SSB or CSI-RS and (2) a UL BM process using a sounding reference signal (SRS). In addition, each BM process may include Tx beam scanning for determining a Tx beam and Rx beam scanning for determining an Rx beam.

[0114] The DL BM process may include: (1) transmission of a beamformed DL RS (eg, CSI-RS or SSB) from the BS and (2) beam reporting from the UE.

[0115] The beam report may include a preferred DL RS ID and a reference signal received power (RSRP) corresponding to the DL RS ID. The DL RS ID may be a SSB resource indicator (SSBRI) or a CSI-RS resource indicator (CRI).

[0116] M-TRP (Multiple Transmit and Receive Point) transmission in NR Release 16

[0117] In NR Release 16, the S-DCI-based M-TRP PDSCH transmission method and the M-DCI-based M-TRPPDSCH transmission method are supported.

[0118] -M-TRP PDSCH based on S-DCI in NR Release 16

[0119] By further dividing the S-DCI-based M-TRP PDSCH transmission, one of SDM, FDM, and TDM can be used. In the case of SDM, one TB is transmitted in multiple layers, but the layers belonging to different DM-RS CDM groups are transmitted on different Tx beams, that is, in the case of different QCL RS or different TCI states. Compared with the existing S-TRP transmission method, this can increase the number of layers, thereby improving the transmission capacity. In addition, when one TB is transmitted in multiple layers, some layers are sent to TRP 1 and other layers are sent to TRP 2, which can improve channel reliability through diversity gain.

[0120] In the case of FDM, two schemes are supported, Scheme 2a and Scheme 2b. In Scheme 2a, a single TB is transmitted in multiple RBs, but RBs belonging to different RB groups are transmitted on different Tx beams (i.e., QCL RS or TCI states). In Scheme 2b, the same TB is transmitted in different RB groups, but RBs belonging to different RB groups are transmitted on different Tx beams (i.e., QCL RS or TCI states).

[0121] In the case of TDM, two schemes are supported, Scheme 3 and Scheme 4. In Scheme 4, which is inter-slot TDM, the same TB is repeatedly transmitted in multiple slots, but slots belonging to different slot groups are transmitted on different Tx beams (i.e., QCL RS or TCI states). In contrast, in Scheme 4, which is intra-slot TDM, the same TB is repeatedly transmitted in multiple OFDM symbol groups, but some OFDM symbol groups and the remaining OFDM symbol groups are transmitted on different Tx beams (i.e., QCL RS or TCI states).

[0122] - M-TRP PDSCH based on M-DCI in NR Release 16

[0123] M-TRP PDSCH transmission based on M-DCI is a method in which each TRP schedules and transmits PDSCH through DCI. That is, TRP 1 transmits PDSCH 1 through DCI 1, and TRP 2 transmits PDSCH 2 through DCI 2. When PDSCH 1 and PDSCH 2 overlap on the same time and frequency resources, the two PDSCHs are received in the same RE, which increases resource efficiency and thereby increases transmission capacity.

[0124] To this end, NR Release 16 introduces a CORESET pool, which is a group of several CORESETs. TRP 1 sends PDCCH in a CORESET belonging to CORESET pool 0, and also sends PDSCH scheduled by the PDCCH. TRP 2 sends PDCCH in a CORESET belonging to CORESET pool 1, and also sends PDSCH scheduled by the PDCCH. A specific TRP can schedule PUSCH transmission for a UE through a CORESET belonging to each CORESET pool. UCI is received on PUCCH in some PUCCH resources scheduled by TRP 1 and the remaining PUCCH resources scheduled by TRP 2. In the case of PUSCH or PUCCH, the channels scheduled or used by the TRPs are TDMed with each other, so there is no overlap, from which no transmission capacity increase can be expected. However, the UE can send independent PUSCH / PUCCH to each of TRP 1 and TRP 2.

[0125] M-TRP transmission in NR Release 17

[0126] NR Release 17 supports M-TRP PDCCH repetition transmission, M-TRP PDCCH / PDSCH SFN transmission, M-TRP PUSCH repetition transmission based on S-DCI, and M-TRP PUCCH repetition transmission based on a single PUCCH resource.

[0127] In all these transmission techniques, the same content (i.e., DCI, UL TB, or UCI) is repeatedly transmitted with URLLC target enhancements for increased reliability. In the case of M-TRP PDCCH repetition transmission, the repetition transmission is performed with TDM or FDM; in the case of M-TRP PDCCH / PDSCH SFN transmission, the repetition transmission is performed at the same time / frequency / layer; in the case of M-TRP PUSCH repetition transmission based on S-DCI, the repetition transmission is performed with TDM; and in the case of M-TRP PUCCH repetition transmission based on a single PUCCH resource, the repetition transmission is performed with TDM.

[0128] - M-TRP PDCCH repetitive transmission based on S-DCI in NR Release 17

[0129] In NR Release 17, for M-TRP PDCCH repetition transmission, multiple CORESETs configured with different TCI states (ie, different QCLRS) are configured for the UE, and multiple SS sets respectively connected to the CORESETs are configured. The BS indicates / configures the link between the SS set connected to one CORESET and the SS set connected to another CORESET for repetition transmission to / for the UE, so that the UE can know that the PDCCH candidates of the SS set are repeatedly transmitted.

[0130] For example, two CORESETs (CORESET#0 and CORESET#1) can be configured for the UE, and connected to SS sets #0 and #1 respectively, and SS set #0 and SS set #1 can be linked. The UE can know that the same DCI is repeatedly transmitted on the PDCCH candidate of SS set #0 and the PDCCH candidate of SS set #1, and through a specific rule, it can be known that the specific PDCCH candidate of SS set #0 and the specific PDCCH candidate of SS set #1 are a pair configured for repeated transmission of the same DCI. These two PDCCH candidates are called linked PDCCH candidates, and when the UE successfully receives any one of the two PDCCH candidates, the UE can successfully decode the DCI. However, when receiving the PDCCH candidate of SS set #0, the UE uses the QCL RS (i.e., DL beam) of the TCI state connected to CORESET #0 of SS set #0, and when receiving the PDCCH candidate of SS set #1, it uses the QCL RS (i.e., DL beam) of the TCI state connected to CORESET #1 of SS set #1, so that the UE receives the linked PDCCH candidates using different beams.

[0131] -M-TRP SFN PDCCH in NR Release 17

[0132] As a special case of M-TRP PDCCH repetition transmission, multiple TRPs can repeatedly send the same DCI through the same time / frequency / DM-RS port, which can be called SFN PDCCH transmission. However, for SFN PDCCH transmission, the BS configures multiple TCI states for one CORESET instead of configuring multiple CORESETs with different TCI states. When a UE receives a PDCCH candidate in an SS set connected to one CORESET, it performs channel estimation on the PDCCH DM-RS and attempts to decode the PDCCH DM-RS using all of the multiple TCI states.

[0133] -M-TRP SFN PDSCH in NR Release 17

[0134] In the above-mentioned M-TRP PDSCH repetition transmission, the two TRPs repeatedly transmit the corresponding channels in different resources. However, in special cases, when the two TRPs use the same resources, that is, when the same channel is repeatedly transmitted even at the same frequency, time and layer (or DM-RS port), the reliability of the channel may be improved. In this case, the repeatedly transmitted same channels are merged and received in the air because their resources are not distinguished. Therefore, from the perspective of the receiver, they are considered to be one channel. In the NR standard, for PDSCH SFN transmission, two DL TCI states can be configured for PDSCH DM-RS reception.

[0135] -M-TRP PUSCH repetitive transmission based on S-DCI in NR Release 17

[0136] For S-DCI-based M-TRP PUSCH transmission, the BS configures two SRS sets for the UE, and the SRS sets are used to indicate the UL transmission port and UL beam / QCL information for TRP#1 and TRP#2, respectively. In addition, the BS can indicate the SRS resources for each SRS set through two SRI fields in one DCI, and indicate up to two power control (PC) parameter sets. For example, the first SRI field can indicate the SRS resources and PC parameter set defined for set 0, and the second SRI field can indicate the SRS resources and PC parameter set defined for set 1.

[0137] The UE receives an indication of the UL Tx port, PC parameter set, and UL beam / QCL information for TRP#1 through the first SRI field, and performs PUSCH transmission in the TO corresponding to SRS set #0. Similarly, the UE receives an indication of the UL Tx port, PC parameter set, and UL beam / QCL information for TRP#2 through the second SRI field, and performs PUSCH transmission in the TO corresponding to SRS set #1.

[0138] -M-TRP PUCCH repetitive transmission based on a single PUCCH resource in NR Release 17

[0139] For M-TRP PUCCH transmission based on a single PUCCH resource, the BS activates / configures two spatial relationship information for a single PUCCH resource for the UE, and when the UE sends UCI in the PUCCH resource, the spatial relationship information is used to indicate the spatial relationship information for TRP#1 and TRP#2, respectively.

[0140] For example, the UE receives an indication of Tx beam / PC parameters for TRP#1 through the value indicated by the first spatial relationship information, and uses this information to perform PUCCH transmission in the TO corresponding to TRP#1. Similarly, the UE receives an indication of Tx beam / PC parameters for TRP#2 through the value indicated by the second spatial relationship information, and uses this information to perform PUCCH transmission in the TO corresponding to TRP#2.

[0141] In the Release 17 standardization meeting, the configuration method is enhanced so that two spatial relationship information can be configured for PUCCH resources for M-TRP PUCCH repeated transmission. That is, when the PC parameters are set in each spatial relationship information, the spatial relationship RS can be configured. As a result, the PC information and spatial relationship RS information corresponding to the two TRPs can be configured by two spatial relationship information, and the UE sends UCI in TO 1 through PUCCH using the first spatial relationship information, and sends the same UCI (ie, CSI, ACKNAK, SR) in TO 2 through PUCCH by using the second spatial relationship information.

[0142] Hereinafter, a PUCCH resource configured with two spatial relationship information is referred to as an M-TRP PUCCH resource, and a PUCCH resource configured with one spatial relationship information is referred to as an S-TRP PUCCH resource.

[0143] Meaning of TCI status / beam indication

[0144] Using or mapping a specific TCI state (or TCI) when data / DCI / UCI is received in a specific frequency / time / space resource may mean that in DL, the channel is estimated from the DM-RS in the frequency / time / space resource using the QCL type and QCL RS indicated by the DL TCI state, and data / DCI is received / demodulated based on the estimated channel.

[0145] In the UL, this may mean transmitting / modulating the DM-RS and data / UCI in frequency / time / space resources using the Tx beam and / or Tx power indicated by the UL TCI status.

[0146] The UL TCI state includes information about the Tx beam or Tx power for the UE, and this information can be configured for the UE through other parameters such as spatial relationship information instead of the TCI state.

[0147] The UL TCI state may be directly indicated by the DCI carrying the UL grant, or may mean the spatial relationship information of the SRS resource indicated by the SRI field in the UL grant DCI. Alternatively, it may mean the open-loop Tx power control parameter linked to the value indicated by the SRI field in the UL grant DCI. Alternatively, the UL TCI may be indicated by the DL grant DCI.

[0148] Although the present disclosure applies the proposed methods under the assumption of collaborative transmission / reception between two TRPs, for ease of description, they can be extended to a multi-TRP environment with three or more TRPs, and can also be extended to a multi-panel environment. Different TRPs can be considered as different TCI states for the UE, and sending / receiving data / DCI / UCI by the UE using TCI state 1 means sending / receiving data / DCI / UCI to / from TRP 1 by the UE.

[0149] In the present disclosure, when multiple channels are TDM, TO means each channel transmitted at different times, when channels are FDM, each channel is transmitted in different frequencies / RBs, and when channels are SDM, each channel is transmitted through different layers / beams / DM-RS ports. One TCI state is mapped to each TO. When the same channel is transmitted repeatedly, the complete DCI / data / UCI is transmitted in one TO, and the receiving end receives multiple TOs to increase the reception success rate.

[0150] STxMP (simultaneous transmission across multiple panels)

[0151] In NR Release 18, a method for UE to simultaneously transmit multiple channels / RS of the same type or multiple channels / RS of different types is being discussed. For legacy UEs, the operation of transmitting multiple channels / RS at a time is restricted. For example, while it is possible to simultaneously transmit multiple SRS resources of different SRS sets for UL beam measurement, it is not possible to simultaneously transmit multiple PUSCHs.

[0152] However, for advanced UEs discussed in NR Release 18, this restriction is relaxed, and advanced UEs can use multiple Tx panels to send multiple channels or RSs simultaneously. Such UEs are called STxMP UEs. For example, two PUSCHs corresponding to two UL TBs are scheduled in the same RE, and spatial relationship RS 1 and PC parameter set 1 (ie, UL TCI state 1) and spatial relationship RS 2 and PC parameter set 2 (ie, UL TCI state 2) are configured for the transmission of PUSCH 1 and PUSCH 2, respectively. The UE simultaneously sends PUSCH 1 using panel 1 corresponding to UL TCI state 1, and sends PUSCH 2 using panel 2 corresponding to UL TCI state 2.

[0153] When the BS schedules PUSCH via DCI, it can indicate whether PUSCH is sent via STxMP, single panel or M-TRPPUSCH repeated transmission. Obviously, the UE should have STxMP capability, and the STxMP mode should be available in advance via RRC signaling. To this end, the existing SRS resource set indicator field can be redefined and used, or a new DCI field can be introduced.

[0154] Relationship between PT-RS and DM-RS in STxMP PUSCH transmission

[0155] A method for associating PT-RS with DM-RS on a panel-by-panel basis in SDM STxMP PUSCH transmission is proposed below.

[0156] In the case of the above-mentioned SDM STxMP, the rank that each panel (i.e., the Tx panel of the UE) should be transmitted is indicated by DCI (e.g., indicating RI1 for panel 1 and RI2 for panel 2), and the rank of the PUSCH is determined as the sum of the ranks of the two panels (RI1+RI2). For example, when the UE indicates RI1 for panel 1 and RI2 for panel 2, the rank of the PUSCH is determined as the sum of the ranks of the two panels RI1+RI2.

[0157] In addition, the (RI1+RI2) DM-RS port is indicated by the DM-RS port indicator field in the DCI. To indicate SDM STxMP PUSCH transmission, the 2-bit SRS resource set indicator is set to 10 or 11, and SDM STxMP PUSCH can be enabled by a separate indicator or specific conditions.

[0158] When the maximum number of PT-RSs is set to 2 through RRC signaling, two PT-RSs are respectively transmitted in two panels in SDM STxMP PUSCH transmission. That is, the BS associates the PT-RS with the DM-RS port by indicating one of the DM-RS ports transmitted in panel 1, and associates the PT-RS with the DM-RS port by indicating one of the DM-RS ports transmitted in panel 2. In the present disclosure, a method of associating PT-RS with DM-RS on a panel-by-panel basis is proposed.

[0159] This method of associating each panel DM-RS to PT-RS port has been supported before. Specifically, the indicated DM-RS ports are divided into two groups, and one PT-RS and one DM-RS port are associated in each group. Each group may refer to a DM-RS port transmitted by each panel. However, the conventional method is only effective when one PUSCH TO is scheduled by a single codebook (CB)-based SRS resource set / a single non-codebook (NCB)-based SRS resource set / a single TPMI field / a single SRI field. In the case of the M-TRP PUSCH transmission method, although two SRS resource sets / two fields are used for PUSCH scheduling, they are used to schedule different PUSCH TOs. Therefore, in the M-TRP PUSCH transmission method, each PUSCH TO is ultimately also scheduled by a single CB SRS resource set / a single NCB SRS resource set / a single TPMI field / a single SRI field.

[0160] When a single PUSCH TO is scheduled for SDM STxMP via multiple CB SRS resource sets / multiple NCB SRS resource sets / multiple TPMI fields / multiple SRI fields, the existing DM-RS to PT-RS port association method is invalid. For example, assume that for CB PUSCH, SRS resource 1 and SRS resource 2 are configured as two 2-port SRS resources from two SRS resource sets via two SRI fields, and are configured using two TPMI fields, for panel 1, RI1 = 1 and precoder 1 = [1 1] T , and for panel 2, RI2 = 1 and precoder2 = [1 -1] T. In this case, the DM-RS port corresponding to precoder 1 and the DM-RS port corresponding to precoder 2 may not be grouped according to the existing method. In the existing grouping method, the layers transmitted using PUSCH antenna ports 1000 and 1002 are determined as one group, and the layers transmitted using PUSCH antenna ports 1001 and 1003 are determined as another group. However, the layers corresponding to precoder 1 and precoder 2 may not be grouped in this manner. For grouping using the existing method, it is necessary to additionally assume that each element of the 2-port SRS resource 1 or precoder 1 is mapped to PUSCH antenna ports 1000 and 1002, and each element of the 2-port SRS resource 2 (or precoder 2) is mapped to PUSCH antenna ports 1001 and 1003.

[0161] In another example, assuming that for CB PUSCH, SRS resources 1 to SRS resources 4 are configured as four 2-port SRS resources from four SRS resource sets through four SRI fields and configured using four TPMI fields, for panel 1, RI1=1 and precoder 1=[1 1] T , and for panel 2, RI2=1 and precoder2=[1 -1] T , for panel 3, RI3=1 and precoder3=[1 j] T , and for panel 4, RI4=1 and precoder4=[1-1]T. In this case, in order to group the DM-RS ports corresponding to precoder 1 to precoder 4, it is additionally assumed that the 2-port SRS resource 1 (or each element of precoder 1) is mapped to PUSCH antenna ports 1000 and 1004, the 2-port SRS resource 2 (or each element of precoder 2) is mapped to PUSCH antenna ports 1001 and 1005, the 2-port SRS resource 3 (or each element of precoder 3) is mapped to PUSCH antenna ports 1002 and 1006, and the 2-port SRS resource 4 (or each element of precoder 4) is mapped to PUSCH antenna ports 1003 and 1007. In addition, the layers transmitted using PUSCH antenna ports 1000 and 1004 should be determined as a group, the layers transmitted using PUSCH antenna ports 1001 and 1005 should be determined as another group, the layers transmitted using PUSCH antenna ports 1002 and 1006 should be determined as a group, and the layers transmitted using PUSCH antenna ports 1003 and 1007 should be determined as another group.

[0162] After being grouped on a panel layer / DM-RS port basis in this manner, the PT-RS field size should be increased to associate the four PT-RS ports with the DM-RS on a panel layer / DM-RS port basis. For example, a 4-bit PT-RS to DM-RS association field is used so that the first field of the field is used for the PT-RS to DM-RS association of panel 1, the second field is used for the PT-RS to DM-RS association of panel 2, the third field is used for the PT-RS to DM-RS association of panel 3, and the fourth field is used for the PT-RS to DM-RS association of panel 4. Alternatively, when only two PT-RS ports are always supported, a 2-bit indicator can be used to select a DM-RS port from group 1 and group 2 and associate it with PT-RS port 0, and another 2-bit indicator can be used to select a DM-RS port from group 3 and group 4 and associate it with PT-RS port 1. Alternatively, when only 2 PT-RS ports are always supported, a 1-bit indicator can be used to select a DM-RS port from a particular group (e.g., group 1) and associated with PT-RS port 0, and another 1-bit indicator can be used to select a DM-RS port from another group (e.g., group 2) and associated with PT-RS port 1.

[0163] In another example, assuming that for CB PUSCH, SRS resource 1 and SRS resource 2 are configured as two 4-port SRS resources from two SRS resource sets through two SRI fields and configured using two TMPI fields, for panel 1, RI1=1 and precoder 1=[1 1 1 1] T , and for panel 2, RI2=1 and precoder2=[1 1 -1 -1] T. In this case, the DM-RS port corresponding to precoder 1 and the DM-RS port corresponding to precoder 2 may not be grouped by the existing method. In the existing grouping method, the layers transmitted using PUSCH antenna ports 1000 and 1002 are determined as one group, and the layers transmitted using PUSCH antenna ports 1001 and 1003 are determined as another group. However, the layers corresponding to precoder 1 and precoder 2 may not be grouped in this way. In order to extend the existing method for grouping, it is necessary to additionally assume that the 4-port SRS resource 1 (or each element of precoder 1) is mapped to PUSCH antenna ports 1000, 1002, 1004, 1006, and the 4-port SRS resource 2 (or each element of precoder 2) is mapped to PUSCH antenna ports 1001, 1003, 1005, 1007. In addition, layers transmitted using PUSCH antenna ports 1000 , 1002 , 1004 , and 1006 should be determined as one group, and layers transmitted using PUSCH antenna ports 1001 , 1003 , 1005 , and 1007 should be determined as another group.

[0164] In another example, SRS resources may be selected from SRS resource set 0 and SRS resource set 1, respectively, through two SRI fields in the NCB PUSCH. DM-RS ports corresponding to SRS resources selected from SRS resource set 0 (i.e., DM-RS ports generated by applying the same precoding as that applied to each SRS resource) may be assumed to be DM-RS ports of panel 1, and DM-RS ports corresponding to SRS resources selected from SRS resource set 1 may be assumed to be DM-RS ports of panel 2. When n1 SRS resources are selected from SRS resource set 0, the DM-RS ports corresponding to these SRS resources may be DM-RS ports with lower n1 indexes among the DM-RS ports (e.g., n1+n2 DM-RS ports) indicated by the DM-RS port indicator, and when n2 SRS resources are selected from SRS resource set 1, the DM-RS ports corresponding to these SRS resources may be the remaining n2 DM-RS ports among the DM-RS ports indicated by the DM-RS port indicator.

[0165] As other methods for grouping layers / DM-RS ports on a panel-by-panel basis, the following may be considered.

[0166] The number of DM-RS port indicator fields may be increased from one to two so that each field may indicate the DM-RS port used by each panel.

[0167] Alternatively, one field may be used, and a specific rule may be used to distinguish the indicated DM-RS ports into DM-RS ports of panel 1 and DM-RS ports of panel 2. For example, a DM-RS port belonging to a first CDM group among the indicated DM-RS ports is defined as a DM-RS port corresponding to panel 1, and a DM-RS port belonging to a second CDM group is defined as a DM-RS port corresponding to panel 2.

[0168] Alternatively, for example, the RI1 DM-RS port indicated first (or with a lower index) among the indicated DM-RS ports is defined as the DM-RS port corresponding to panel 1, and the remaining DM-RS ports are defined as the DM-RS ports corresponding to panel 2.

[0169] After grouping the layers / DM-RS ports on a panel-by-panel basis, two PT-RSs may be associated with the DM-RS ports, respectively, using a 2-bit PT-RS to DM-RS association field according to the method proposed below.

[0170] 1) When RI1=1 and RI2=1, each panel transmits only one layer. Therefore, PT-RS ports 0 and 1 are associated with the DM-RS ports transmitted by panels 1 and 2, respectively.

[0171] 2) When RI1=1 and RI2=2, PT-RS port 0 is associated with one DM-RS port transmitted by panel 1. PT-RS port 1 is associated with one of the two DM-RS ports transmitted by panel 2 and is indicated by the PT-RS to DM-RS Association field in the DCI (using only one MSB or one LSB in the 2-bit size field).

[0172] 3) When RI1=2 and RI2=1, PT-RS port 1 is associated with one DM-RS port transmitted by panel 2. PT-RS port 0 is associated with one of the two DM-RS ports transmitted by panel 1 and is indicated by the PT-RS to DM-RS Association field in the DCI (using only one MSB or one LSB in the 2-bit size field).

[0173] 4) When RI1=2 and RI2=2, PT-RS port 0 is associated with one of the two DM-RS ports transmitted by panel 1 and is indicated by the PT-RS to DM-RS association field in the DCI (using only one MSB or one LSB of the 2-bit size field). PT-RS port 1 is associated with one of the two DM-RS ports transmitted by panel 2 and is indicated by the PT-RS to DM-RS association field in the DCI (using only one MSB or one LSB of the 2-bit size field).

[0174] 5) When RI1=1 and RI2=3, PT-RS port 0 is associated with one DM-RS port transmitted by panel 1. PT-RS port 1 is associated with one of the three DM-RS ports transmitted by panel 2 and is indicated by the PT-RS to DM-RS Association field in the DCI (using 2 bits for both).

[0175] 6) When RI1=3 and RI2=1, PT-RS port 1 is associated with one DM-RS port transmitted by panel 2. PT-RS port 0 is associated with one of the three DM-RS ports transmitted by panel 1 and is indicated by the PT-RS to DM-RS association field in the DCI (using 2 bits for both).

[0176] In the above proposal, the 2-bit PT-RS to DM-RS association field is interpreted differently depending on the combination of (RI1, RI2). That is, in the case of (1,2), (2,1) and (2,2), one bit is used for each PT-RS DM-RS association indication, while in the case of (1,3) and (3,1), two bits are used for PT-RS indication for a panel transmitting three layers.

[0177] Even when the maximum number of PT-RSs is set to 2, when PUSCH transmission is performed using a single panel, the number of PT-RSs is set to 1. For example, when the SRS resource set indicator is set to 00 or 01, the single panel transmission may fall back to STxMP transmission. In this case, the number of PT-RSs is set to 1, and one of the indicated DM-RS ports and the PT-RS are associated through the PT-RS to DM-RS association field.

[0178] In order to be compatible with the conventional M-TRP PUSCH repetition transmission, more specifically, in order to be compatible with the M-TRP PUSCH repetition transmission of 3GPP NR Release 17, the present disclosure can be applied when the number of repetitions is 1, and when the number of repetitions is 2 or more, the PT-RS to DM-RS association can be indicated in a 3GPP NR Release 17 manner.

[0179] Alternatively, in order to apply both STxMP that performs PUSCH transmission in one TO using two panels, and TDM repeated transmission that sends the same TB across multiple TOs, a new indicator can be defined. When the indicator is 1, two SRS resource sets can be mapped to a single TO and applied repeatedly to multiple TOs to perform repeated PUSCH transmission, and when the indicator is 0, only one SRS resource set can be mapped to one TO (that is, the M-TRPPUSCH transmission method of 3GPP NR Release 17 can be applied). In addition, four SRI / TPMIs can be indicated for the targets of four TRPs, and two pairs can be indicated by pairing the SRI / TPMIs and applied alternately to each TO.

[0180] The rank of PUSCH can be used to dynamically indicate one of SDM STxMP and the remaining STxMP techniques (i.e., SFNSTxMP and FDM STxMP) to the UE, or dynamically indicate one of SDM STxMP and the existing M-TRP repeated transmission to the UE. Because SDM STxMP requires a PUSCH rank of 2 or higher, SDM STxMP and the remaining STxMP techniques can be distinguished depending on whether the rank is 2 or higher. For this reason, the remaining STxMP techniques are limited to transmissions with rank 1.

[0181] When dynamic switching between SDM STxMP and SFN STxMP is enabled through MAC CE or DCI, the following method can be considered.

[0182] When the maximum number of PT-RS is set to 2 (or 2 or more) through RRC signaling, SDM STxMP uses 2 (or 2 or more) PT-RS ports, whereas SFN STxMP uses only 1 PT-RS port (i.e., PT-RS port 0). That is, it is proposed to determine the number of PT-RS ports actually used according to the STxMP technology. In SFN STxMP, multiple panels send the same DM-RS port. Therefore, regardless of the DM-RS port associated with the PT-RS port, the PT-RS port is associated with two panels. Therefore, the PT-RS port may not be configured separately for each panel, and therefore, one PT-RS port is sufficient.

[0183] In addition, even for UEs that enable SDM STxMP transmission mode through RRC signaling, the maximum number of PT-RSs is set to 2, and the number of PT-RSs is also set to 1 when PUSCH transmission is performed using a single panel or a single SRS resource set.

[0184] For example, when the SRS resource set indicator is 00 or 01, and the codebook subset restriction (CSR) of the codebook corresponding to the SRS resource set selected by the SRS resource set indicator is fullyAndPartialAndNonCoherent, the UE ignores the maximum number of PT-RSs set to 2 and interprets the PT-RS to DM-RS association field of the UL scheduling DCI, assuming that the maximum number of PT-RSs is 1 (i.e., assuming that the number of PT-RS ports is 1). In other words, the UE ignores that the maximum number of PT-RSs is set to 2 and interprets the PT-RS to DM-RS association field using the following Tables 6 to 8. This is because in the case of a codebook with a CSR of fullyAndPartialAndNonCoherent, all PUSCH antenna ports are co-coherent, allowing phase tracking with a single PT-RS.

[0185] The codebook corresponding to the SRS resource set may mean a codebook used by a TPMI field (eg, a first TPMI field) connected to the SRS resource set 0 and a TPMI field (eg, a second TPMI field) connected to the SRS resource set 1.

[0186] In another example, when the SRS resource set indicator is 00 or 01, and the UE reports that it supports full coherence through its UE capabilities, the UE ignores the maximum number of PT-RSs set to 2, and interprets the PT-RS to DM-RS association field of the UL scheduling DCI assuming that the maximum number of PT-RSs is 1 (i.e., assuming that the number of PT-RS ports is 1). In other words, the UE ignores the maximum number of PT-RSs set to 2, and interprets the PT-RS to DM-RS association field using Tables 6 to 8. This is because the SRS resources of the SRS resource set indicated by the SRS resource set indicator are coherent, thereby allowing phase tracking with a single PT-RS.

[0187] [Table 6]

[0188] value DM-RS Port 0 First scheduled DM-RS port 1 Second scheduled DM-RS port 2 The third scheduled DM-RS port 3 DM-RS port of the fourth schedule

[0189] [Table 7]

[0190] MSB value DM-RS Port LSB value DM-RS Port 0 The first scheduled DM-RS port corresponding to the SRS resource indicator field and / or the precoding information and layer number field 0 A first scheduled DM-RS port corresponding to a second SRS resource indicator field and / or a second precoding 1 The second scheduled DM-RS port corresponding to the SRS resource indicator field and / or the precoding information and layer number field 1 A first scheduled DM-RS port corresponding to a second SRS resource indicator field and / or a second precoding

[0191] [Table 8]

[0192] MSB value DM-RS Port LSB value DM-RS Port 0 The first DM-RS port that shares PT-RS port 0 0 The first DM-RS port that shares PT-RS port 1 1 The second DM-RS port that shares PT-RS port 0 1 The second DM-RS port that shares PT-RS port 1

[0193] In the above proposal, the UE ignores the maximum number of PT-RSs set to 2 and interprets the PT-RS to DM-RS association field of the UL scheduling DCI assuming that the maximum number of PT-RSs is 1 or the number of PT-RS ports is 1. That is, the UE ignores the maximum number of PT-RSs set to 2 and interprets the PT-RS to DM-RS association field using Table 7.3.1.1.2-25. In the same sense, the UE assumes that all indicated PUSCH DM-RS ports share PT-RS port 0.

[0194] Alternatively, when SDM STxMP transmission is indicated to a UE that enables SDM STxMP transmission mode by RRC signaling (for example, when the SRS resource set indicator field configured in the UL DCI is 10 or 11 and the number of PUSCH repetitions is set to 1 or 0, or when the SRS resource set indicator field configured in the UL DCI is 10 or 11), the UE ignores the maximum number of PT-RS configured by RRC signaling and interprets the PT-RS to DM-RS association field of the UL scheduling DCI, assuming that the maximum number of PT-RS is 2 or the number of PT-RS is 2. Specifically, the UE performs the following operations for NCB PUSCH and CB PUSCH, respectively.

[0195] When the UE sends NCB PUSCH, it assumes that the number of PT-RS is 2, assumes that the SRS resources of SRS resource set 0 indicated by the first SRI field share PT-RS port 0 with the DM-RS port corresponding to the SRS resource, and assumes that the SRS resources of SRS resource set 0 indicated by the second SRI field share PT-RS port 1 with the DM-RS port corresponding to the SRS resource.

[0196] When the UE sends a CB PUSCH, it assumes that the number of PT-RSs is 2, assumes that the SRS resources of the SRS resource set 0 indicated by the first SRI field and the DM-RS port generated by applying the PMI indicated by the first TPMI field to the antenna port of the SRS resources share PT-RS port 0, and assumes that the SRS resources of the SRS resource set 1 indicated by the second SRI field and the DM-RS port generated by applying the PMI indicated by the second TPMI field to the antenna port of the SRS resources share PT-RS port 1.

[0197] On the other hand, when S-TRP transmission is indicated to a UE that enables SDM STxMP transmission mode through RRC signaling (for example, when the SRS resource set indicator field set in the UL DCI is set to 00 or 01), the UE defines the PT-RS to DM-RS association in a traditional manner according to the maximum number of PT-RS set by RRC.

[0198] Figure 7 is a flow chart for sending PT-RS for STxMP according to the present disclosure. Figure 7 , it is assumed that the UE receives information about the maximum number of PT-RSs being 2 from the BS and then performs STxMP.

[0199] refer to Figure 7 , the UE receives DCI for STxMP from the BS in step A05. Specifically, a 2-bit SRS resource set indicator included in the DCI is set to 10 or 11 to indicate SDM STxMP PUSCH transmission, and SDM STxMP PUSCH can be enabled by a separate indicator or a specific condition.

[0200] In step A10, the UE identifies the PT-RS port to DM-RS port association information included in the DCI. Specifically, the first information of the PT-RS port to DM-RS port association information identified by the UE indicates a first DM-RS port associated with the first PT-RS port among the DM-RS ports corresponding to at least one of the first SRI or the first precoding information, and the second information of the PT-RS port to DM-RS port association information indicates a second DM-RS port associated with the second PT-RS port among the DM-RS ports corresponding to at least one of the second SRI or the second precoding information.

[0201] Preferably, the first information is the first bit of the PT-RS port and DM-RS port association information, and the second information is the second bit of the PT-RS port and DM-RS port association information.

[0202] In addition, for step A10, the UE preliminarily receives information about a DM-RS port corresponding to at least one of the first SRI or the first precoding information and information about a DM-RS port corresponding to at least one of the second SRI or the second precoding information from the BS through RRC signaling.

[0203] Subsequently, the UE transmits a first PT-RS on a first PT-RS port and a second PT-RS on a second PT-RS port to the BS in step A15.

[0204] Finally, in step A20, the UE transmits a first PUSCH based on a first DM-RS associated with a first PT-RS and a second PUSCH based on a second DM-RS associated with a second PT-RS to the BS. Specifically, the first DM-RS port is associated with a first PUSCH transmitted on a first panel, the second DM-RS port is associated with a second PUSCH transmitted on a second panel, and the first PUSCH and the second PUSCH are transmitted to the BS in the same time and frequency resources.

[0205] In the present disclosure, the number of PT-RSs refers to the number of PT-RS ports.

[0206] In the present disclosure, for PUSCH, multiple panels may correspond to multiple SRS resource sets configured for CB / NCB purposes, or to SRS resources indicated by multiple SRI fields. For example, panel 1 and panel 2 may correspond to SRS resource set 0 and SRS resource set 1, respectively. Alternatively, panel 1 and panel 2 may correspond to SRS resources indicated by the first SRI field and SRS resources indicated by the second SRI field, or multiple panels may correspond to PMIs indicated by multiple TPMI fields. For example, panel 1 may correspond to a PMI indicated by a first TPMI field, and panel 2 may correspond to a PMI indicated by a second TPMI field. In addition, for PUCCH, they may correspond to multiple spatial relationship information configured for PUCCH resources. For example, panel 1 may correspond to spatial relationship information 0, and panel 2 may correspond to spatial relationship information 1. Alternatively, a panel ID may be introduced in the standard to directly indicate the panel. Alternatively, multiple panels may correspond to multiple UL TCI states indicated using a unified TCI framework.

[0207] Alternatively, a panel may be defined as a group of antenna ports with coherence. For example, in the existing standard, when a 4Tx codebook is configured, PUSCH antenna ports 1000 and 1002 may be defined as panel 1, and PUSCH antenna ports 1001 and 1003 may be defined as panel 2. Similarly, when an 8Tx codebook is introduced later, PUSCH antenna ports 1000, 1002, 1004, 1006 may be defined as panel 1, and PUSCH antenna ports 1001, 1003, 1005, 1007 may be defined as panel 2. For NCB PUSCH, a PT-RS port index may be configured for each SRS resource, and SRS resources with the same PT-RS port index may be assumed to be transmitted in the same panel.

[0208] Although for ease of description, the above proposal assumes that two STxMP panels, two ULTCI states, and two spatial relationship information / RS and PC sets are configured for UL M-TRP transmission, this can be extended to N1, N2 and N3 STxMP panels, ULTCI states, spatial relationship information / RS and PC sets.

[0209] The above proposals can eventually be applied in combination.

[0210] Although these proposals have been described in the context of PUSCH, they may be extended to other channels such as PUCCH / PDSCH / PDCCH.

[0211] Whether to apply the above proposal and the factors used in the proposal may be indicated to the UE through DCI / MAC-CE / RRC signaling from the BS, or the UE may report them to the BS.

[0212] Figure 8 An exemplary communication system to which an embodiment of the present disclosure is applied is illustrated.

[0213] refer to Figure 8 , the communication system 1 applied to the embodiment includes a wireless device, a base station (BS), and a network. In this article, the wireless device refers to a device that uses a radio access technology (RAT) (e.g., 5G new RAT (NR)) or long term evolution (LTE)) to perform communication 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. In this article, 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 head mounted devices (HMDs), head up displays (HUDs) installed in vehicles, televisions, smart phones, computers, wearable devices, home appliance devices, digital signage, vehicles, robots, etc. Handheld devices may include smart phones, smart boards, wearable devices (e.g., smart watches or smart glasses), and computers (e.g., notebook computers). 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 with respect to other wireless devices.

[0214] 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 going through the BS / network. For example, the 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.

[0215] Wireless communication / connection 150a, 150b or 150c may be established between wireless devices 100a to 100f / BS 200 or BS 200 / BS 200. In this document, wireless communication / connection such as uplink / downlink communication 150a, sidelink communication 150b (or D2D communication) or inter-BS communication (e.g., relay, integrated access backhaul (IAB)) may be established through various RATs (e.g., 5G NR). The wireless device and the BS / wireless device may send / receive radio signals to 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, various configuration information configuration processes for sending / receiving radio signals, various signal processing processes (e.g., channel coding / decoding, modulation / demodulation and resource mapping / demapping) and at least a portion of a resource allocation process may be performed based on various proposals of the embodiments.

[0216] Fig. 9 An exemplary wireless device to which the embodiments are applicable is shown.

[0217] refer to Fig. 9 , the first wireless device 100 and the second wireless device 200 may transmit radio signals via a plurality of RATs (eg, LTE and NR). In this document, {the first wireless device 100 and the second wireless device 200} may correspond to Figure 8 {wireless device 100x and BS 200} and / or {wireless device 100x and wireless device 100x}.

[0218] The first wireless device 100 may include one or more processors 102 and one or more memories 104 and additionally 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 descriptions, functions, processes, proposals, methods and / or operational 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 descriptions, functions, processes, proposals, methods and / or operational flowcharts disclosed in this document. In this article, 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 send and / or receive radio signals through one or more antennas 108. Each of the transceivers 106 may include a transmitter and / or a receiver. The transceiver 106 may be used interchangeably with a radio frequency (RF) unit. In an embodiment, the wireless device may represent a communication modem / circuit / chip.

[0219] The second wireless device 200 may include one or more processors 202 and one or more memories 204 and additionally 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 operational 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 106, and then store the 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 process controlled by the processor 202 or for executing the description, functions, processes, proposals, methods and / or operational flowcharts disclosed in this document. In this article, 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 send and / or receive radio signals through one or more antennas 208. Each of the transceivers 206 may include a transmitter and / or a receiver. The transceiver 206 may be used interchangeably with an RF unit. In an embodiment, the wireless device may represent a communication modem / circuit / chip.

[0220] 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. The 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 the one or more transceivers 106 and 206. The one or more processors 102 and 202 may receive a signal (e.g., a baseband signal) from the 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.

[0221] 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 flowcharts disclosed in this document may be implemented using firmware or software, and the firmware and 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 flowcharts 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 so as to be driven by one or more processors 102 and 202. The descriptions, functions, processes, proposals, methods, and / or operational flowcharts disclosed in this document may be implemented using firmware or software in the form of code, commands, and / or command sets.

[0222] 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, registers, cache memory, computer-readable storage media, and / or combinations 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 via various technologies such as wired or wireless connections.

[0223] One or more transceivers 106 and 206 can 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 can 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 can 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 can perform control so that one or more transceivers 106 and 206 can send user data, control information or radio signals to one or more other devices. One or more processors 102 and 202 can perform control so that one or more transceivers 106 and 206 can 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 into 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 into RF band signals. To this end, one or more transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0224] Fig.10 Other exemplary wireless devices for which embodiments are applied are illustrated. The wireless device may be implemented in various forms depending on the use case / service (see Figure 8 ).

[0225] refer to Fig.10 , the wireless devices 100 and 200 may correspond to Fig. 9The wireless devices 100 and 200 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. 9 One or more processors 102 and 202 and / or one or more memories 104 and 204. For example, the transceiver 114 may include Fig. 9 The control unit 120 is electrically connected to the communication unit 110, the memory 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 through a wireless / wired interface in the memory unit 130.

[0226] The additional component 140 may be configured differently depending on the type of the wireless device. For example, the additional component 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 implemented in the form of, but not limited to, a robot ( Figure 8 100a), vehicles ( Figure 8 100b-1 and 100b-2), XR devices ( Figure 8 100c), handheld devices ( Figure 8 100d), household appliances ( Figure 8 100e), IoT devices ( Figure 8 100f), digital broadcasting terminals, hologram equipment, public security equipment, MTC equipment, medical equipment, fintech equipment (or financial equipment), security equipment, climate / environmental equipment, AI servers / equipment ( Figure 8 400), BS ( Figure 8 200), network nodes, etc. The wireless device can be used in a mobile or fixed location depending on the use case / service.

[0227] exist Fig.10In the wireless devices 100 and 200, all of the various elements, components, units / parts and / or modules in the wireless devices 100 and 200 may be connected to each other through a wired interface, or at least a part thereof may be connected wirelessly 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 connected through a wire and the control unit 120 and the first unit (e.g., 130 and 140) may be connected wirelessly through the communication unit 110. Each element, component, unit / part and / or module 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 set of one or more processors. As an example, the control unit 120 may be configured by a set 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 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.

[0228] Fig.11 An exemplary vehicle or autonomous vehicle to which the embodiments are applied is shown. The vehicle or autonomous vehicle may be implemented as a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc.

[0229] 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, registers, cache memory, computer-readable storage media, and / or combinations 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 via various technologies such as wired or wireless connections.

[0230] One or more transceivers 106 and 206 can 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 can 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 can 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 can perform control so that one or more transceivers 106 and 206 can send user data, control information or radio signals to one or more other devices. One or more processors 102 and 202 can perform control so that one or more transceivers 106 and 206 can 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 into 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 into RF band signals. To this end, one or more transceivers 106 and 206 may include (analog) oscillators and / or filters.

[0231] Fig.10 Other exemplary wireless devices for which embodiments are applied are illustrated. The wireless device may be implemented in various forms depending on the use case / service (see Figure 8 ).

[0232] refer to Fig.10 , the wireless devices 100 and 200 may correspond to Fig. 9The wireless devices 100 and 200 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. 9 The one or more processors 102 and 202 and / or one or more memories 104 and 204 of FIG. 36. For example, the transceiver 114 may include one or more transceivers 106 and 206 and / or one or more antennas 108 and 208 of FIG. 36. The control unit 120 is electrically connected to the communication unit 110, the memory 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 the 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 the information received from the outside (e.g., other communication devices) via the communication unit 110 through a wireless / wired interface in the memory unit 130.

[0233] The additional component 140 may be configured differently depending on the type of the wireless device. For example, the additional component 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 implemented in the form of, but not limited to, a robot ( Figure 8 100a), vehicles ( Figure 8 100b-1 and 100b-2), XR devices ( Figure 8 100c), handheld devices ( Figure 8 100d), household appliances ( Figure 8 100e), IoT devices ( Figure 8 100f), digital broadcasting terminals, hologram equipment, public security equipment, MTC equipment, medical equipment, fintech equipment (or financial equipment), security equipment, climate / environmental equipment, AI servers / equipment ( Figure 8 400), BS ( Figure 8 200), network nodes, etc. The wireless device can be used in a mobile or fixed location depending on the use case / service.

[0234] exist Fig.10In the wireless devices 100 and 200, all of the various elements, components, units / parts and / or modules in the wireless devices 100 and 200 may be connected to each other through a wired interface, or at least a part thereof may be connected wirelessly 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 connected through a line and the control unit 120 and the first unit (e.g., 130 and 140) may be wirelessly connected through the communication unit 110. Each element, component, unit / part and / or module 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 set of one or more processors. As an example, the control unit 120 may be configured by a set 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 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.

[0235] Fig.11 An exemplary vehicle or autonomous vehicle to which the embodiments are applied is shown. The vehicle or autonomous vehicle may be implemented as a mobile robot, a car, a train, a manned / unmanned aerial vehicle (AV), a ship, etc.

[0236] refer to Fig.11 , 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.10 Block 110 / 130 / 140.

[0237] The communication unit 110 may transmit 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 driving vehicle 100. The control unit 120 may include an electronic control unit (ECU). The drive unit 140a may enable the vehicle or autonomous driving vehicle 100 to drive on a road. The drive unit 140a may include an engine, a motor, a power train, wheels, brakes, a steering device, and the like. The power supply unit 140b may supply power to the vehicle or autonomous driving vehicle 100 and include a wired / wireless charging circuit, a battery, and the like. The sensor unit 140c may acquire vehicle status, surrounding environment information, user information, and the like. 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 / reverse sensor, a battery sensor, a fuel sensor, a tire sensor, a steering sensor, a temperature sensor, a humidity sensor, an ultrasonic sensor, a light sensor, a pedal position sensor, etc. The autonomous driving unit 140d may implement a technology for maintaining a lane on which the vehicle is driving, a technology for automatically adjusting a speed (such as adaptive cruise control), a technology for autonomously driving along a determined path, a technology for driving by automatically setting a path with a destination set, and the like.

[0238] 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). During autonomous driving, the communication unit 110 may aperiodically / periodically obtain the latest traffic information data from an external server and obtain surrounding traffic information data from neighboring vehicles. During 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 retrieved data / information. The communication unit 110 may transfer 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.

[0239] Those skilled in the art will appreciate that, without departing from the spirit and basic characteristics of the embodiments, the embodiments can be implemented in other specific ways than those described herein. Therefore, the above-described embodiments should be interpreted as illustrative and not restrictive in all aspects. The scope of the present disclosure should be determined by the attached claims and their legal equivalents, rather than by the above description, and it is intended that all changes falling within the meaning and equivalent range of the attached claims are included therein. It is obvious to those skilled in the art that claims that are not explicitly referenced to each other in the attached claims can be presented in combination as embodiments, or included as new claims by subsequent amendments after filing an application.

[0240] It will be apparent to those skilled in the art that the present disclosure can be implemented in other specific forms without departing from the scope of the present disclosure. Therefore, the above detailed description should not be interpreted as being restrictive in all aspects, but should be regarded as illustrative. The scope of the present disclosure should be determined by a reasonable interpretation of the attached claims, and all changes within the equivalent range of the present disclosure are intended to be included in the scope of the present disclosure.

[0241] Industrial Applicability

[0242] The present disclosure is applicable to UE, BS or other devices in a wireless mobile communication system.

Claims

1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising: receiving downlink control information (DCI) for simultaneous transmission (STxMP) across multiple panels from a base station (BS); as well as transmitting a first phase tracking (PT)-reference signal (RS) on a first PT-RS port and a second PT-RS on a second PT-RS port to the BS based on PT-RS port to demodulation (DM)-RS port association information included in the DCI, wherein the first information of the PT-RS port to DM-RS port association information indicates a first DM-RS port associated with the first PT-RS port among the DM-RS ports corresponding to at least one of a first sounding reference signal resource indicator (SRI) or first precoding information, and The second information of the PT-RS port to DM-RS port association information indicates a second DM-RS port associated with the second PT-RS port among the DM-RS ports corresponding to at least one of the second SRI or the second precoding information.

2. The method according to claim 1, further comprising: Information indicating that a maximum number of PT-RSs is 2 is received from the BS.

3. The method according to claim 1, wherein: The first information is the first bit of the PT-RS port to DM-RS port association information, and The second information is the second bit of the PT-RS port to DM-RS port association information.

4. The method according to claim 1, further comprising: Information about the DM-RS port corresponding to the at least one of the first SRI or the first precoding information, and information about the DM-RS port corresponding to the at least one of the second SRI or the second precoding information are received from the BS.

5. The method according to claim 1, wherein: The first DM-RS port is associated with a first PUSCH transmitted on a first panel, wherein the second DM-RS port is associated with a second PUSCH transmitted on a second panel, and The first PUSCH and the second PUSCH are sent to the BS in the same time and frequency resources.

6. A user equipment (UE) in a wireless communication system, comprising: at least one transceiver; at least one processor; as well as at least one computer memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations, The operations include: receiving downlink control information (DCI) for simultaneous transmission across multiple panels (STxMP) from a base station (BS); and transmitting a first phase tracking (PT)-reference signal (RS) on a first PT-RS port and a second PT-RS on a second PT-RS port to the BS based on PT-RS port to demodulation (DM)-RS port association information included in the DCI, wherein the first information of the PT-RS port to DM-RS port association information indicates a first DM-RS port associated with the first PT-RS port among the DM-RS ports corresponding to at least one of a first sounding reference signal resource indicator (SRI) or first precoding information, and The second information of the PT-RS port to DM-RS port association information indicates a second DM-RS port associated with the second PT-RS port among the DM-RS ports corresponding to at least one of the second SRI or the second precoding information.

7. The UE according to claim 6, wherein: The operation further includes receiving information indicating that a maximum number of PT-RSs is 2 from the BS.

8. The UE according to claim 6, wherein: The first information is the first bit of the PT-RS port to DM-RS port association information, and The second information is the second bit of the PT-RS port to DM-RS port association information.

9. The UE according to claim 6, wherein: The operation further includes receiving, from the BS, information about the DM-RS port corresponding to the at least one of the first SRI or the first precoding information, and information about the DM-RS port corresponding to the at least one of the second SRI or the second precoding information.

10. The UE according to claim 6, wherein: The first DM-RS port is associated with a first PUSCH transmitted on a first panel, wherein the second DM-RS port is associated with a second PUSCH transmitted on a second panel, and The first PUSCH and the second PUSCH are sent to the BS in the same time and frequency resources.

11. A processing device in a wireless communication system, comprising: at least one processor; as well as at least one computer memory operably connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations for a user equipment (UE), The operations include: receiving downlink control information (DCI) for simultaneous transmission across multiple panels (STxMP) from a base station (BS); and transmitting a first phase tracking (PT)-reference signal (RS) on a first PT-RS port and a second PT-RS on a second PT-RS port to the BS based on PT-RS port to demodulation (DM)-RS port association information included in the DCI, wherein the first information of the PT-RS port to DM-RS port association information indicates a first DM-RS port associated with the first PT-RS port among the DM-RS ports corresponding to at least one of a first sounding reference signal resource indicator (SRI) or first precoding information, and The second information of the PT-RS port to DM-RS port association information indicates a second DM-RS port associated with the second PT-RS port among the DM-RS ports corresponding to at least one of the second SRI or the second precoding information.

12. A computer-readable storage medium storing at least one program code comprising instructions that, when executed, cause at least one processor to perform operations for a user equipment (UE), in, The operations include: receiving downlink control information (DCI) for simultaneous transmission across multiple panels (STxMP) from a base station (BS); and transmitting a first phase tracking (PT)-reference signal (RS) on a first PT-RS port and a second PT-RS on a second PT-RS port to the BS based on PT-RS port to demodulation (DM)-RS port association information included in the DCI, wherein the first information of the PT-RS port to DM-RS port association information indicates a first DM-RS port associated with the first PT-RS port among the DM-RS ports corresponding to at least one of a first sounding reference signal resource indicator (SRI) or first precoding information, and The second information of the PT-RS port to DM-RS port association information indicates a second DM-RS port associated with the second PT-RS port among the DM-RS ports corresponding to at least one of the second SRI or the second precoding information.

13. A method performed by a base station (BS) in a wireless communication system, the method comprising: Sending downlink control information (DCI) to a user equipment (UE) for simultaneous transmission across multiple panels (STxMP); as well as receiving, from the UE, a first phase tracking (PT)-reference signal (RS) on a first PT-RS port and a second PT-RS on a second PT-RS port based on PT-RS port to demodulation (DM)-RS port association information included in the DCI, wherein the first information of the PT-RS port to DM-RS port association information indicates a first DM-RS port associated with the first PT-RS port among the DM-RS ports corresponding to at least one of a first sounding reference signal resource indicator (SRI) or first precoding information, and The second information of the PT-RS port to DM-RS port association information indicates a second DM-RS port associated with the second PT-RS port among the DM-RS ports corresponding to at least one of the second SRI or the second precoding information.

14. The method according to claim 13, further comprising: Information indicating that a maximum number of PT-RSs is 2 is sent to the UE.

15. The method according to claim 13, wherein: The first information is the first bit of the PT-RS port to DM-RS port association information, and The second information is the second bit of the PT-RS port to DM-RS port association information.

16. The method according to claim 13, further comprising: Information about the DM-RS port corresponding to the at least one of the first SRI or the first precoding information, and information about the DM-RS port corresponding to the at least one of the second SRI or the second precoding information are sent to the UE.

17. The method according to claim 13, wherein: The first DM-RS port is associated with a first PUSCH transmitted on a first panel, wherein the second DM-RS port is associated with a second PUSCH transmitted on a second panel, and The first PUSCH and the second PUSCH are received from the UE in the same time and frequency resources.

18. A base station (BS) in a wireless communication system, comprising: at least one transceiver; at least one processor; as well as at least one computer memory operatively connected to the at least one processor and storing instructions that, when executed, cause the at least one processor to perform operations, The operations include: sending downlink control information (DCI) for simultaneous transmission across multiple panels (STxMP) to a user equipment (UE); and receiving, from the UE, a first phase tracking (PT)-reference signal (RS) on a first PT-RS port and a second PT-RS on a second PT-RS port based on PT-RS port to demodulation (DM)-RS port association information included in the DCI, wherein the first information of the PT-RS port to DM-RS port association information indicates a first DM-RS port associated with the first PT-RS port among the DM-RS ports corresponding to at least one of a first sounding reference signal resource indicator (SRI) or first precoding information, and The second information of the PT-RS port to DM-RS port association information indicates a second DM-RS port associated with the second PT-RS port among the DM-RS ports corresponding to at least one of the second SRI or the second precoding information.

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