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

Abstract

A method performed by a terminal according to an embodiment of the present specification includes receiving a DCI for scheduling a PUSCH, transmitting a DMRS based on one or more DMRS ports, transmitting a PTRS based on at least one PTRS port, and transmitting the PUSCH. The number of layers associated with the PUSCH is greater than four. The DCI includes a PTRS-DMRS association field. The PTRS-DMRS association field indicates an association between the one or more DMRS ports and the at least one PTRS port. Since the maximum number of the at least one PTRS port is 1, the PTRS-DMRS association field is based on a 3-bit value indicating one of eight DMRS ports.

Description

[Technical Field]

[0001] The present specification relates to a method and apparatus for transmitting and receiving PTRS in a wireless communication system. [Background technology]

[0002] Mobile communication systems were developed to provide voice services while ensuring user activity. However, the scope of mobile communication systems has expanded beyond voice to include data services, and currently, explosive traffic growth is causing resource shortages and users are demanding faster services, so more advanced mobile communication systems are required.

[0003] The next generation of mobile communication systems must be able to accommodate explosive data traffic, dramatically increase the transmission rate per user, accommodate a significantly increased number of connected devices, achieve extremely low end-to-end latency, and be energy efficient. To achieve this, various technologies are being researched, including dual connectivity, massive multiple input multiple output (MIMO), in-band full duplex, non-orthogonal multiple access (NOMA), super wideband support, and device networking.

[0004] In Rel-18, UL transmission of rank 5 or higher (i.e., the number of layers is 5) based on 8 Tx antenna ports can be supported. In this case, problems may occur in indicating the PTRS-DMRS association. This is because the existing DCI field (i.e., the PTRS-DMRS association field) utilizes a table defined under the assumption that up to four layers are supported. Summary of the Invention [Problem to be solved by the invention]

[0005] As described above, according to the existing method, PTRS-DMRS association cannot be indicated for the number of layers equal to or greater than 5 (Rank 5).

[0006] The purpose of this specification is to propose a method for instructing PTRS-DMRS association for Rank 5 and above.

[0007] The technical problems to be solved in this specification are not limited to the technical problems mentioned above, and another technical problem not mentioned will be clearly understood by a person having ordinary skill in the art to which the present invention pertains from the description below. [Means for solving the problem]

[0008] A method performed by a terminal in a wireless communication system according to an embodiment of the present specification includes receiving downlink control information (DCI) for scheduling a physical uplink shared channel (PUSCH), transmitting a demodulation reference signal (DMRS) based on one or more DMRS ports, transmitting a phase tracking reference signal (PTRS) based on at least one PTRS port, and transmitting the PUSCH.

[0009] The DCI includes an antenna port field, based on which the one or more DMRS ports are indicated.

[0010] The transmission scheme associated with the PUSCH is set to codebook or non-codebook.

[0011] The number of layers associated with the PUSCH is greater than 4. The DCI includes a PTRS-DMRS association field, which indicates an association between the one or more DMRS ports and the at least one PTRS port.

[0012] Based on the fact that the maximum number of the at least one PTRS port is 1, the PTRS-DMRS association field is characterized by being based on a 3-bit value indicating one of eight DMRS ports.

[0013] Based on the maximum number of the at least one PTRS port being two, the PTRS-DMRS association field may be based on a 4-bit value.

[0014] Two bits of the 4-bit value may indicate one of the four DMRS ports that share the first PTRS port, and the remaining 2 bits of the 4-bit value may indicate one of the four DMRS ports that share the second PTRS port.

[0015] Based on the transmission scheme associated with the PUSCH being set in the codebook, the first PTRS port may be associated with at least one first layer of the layers associated with the PUSCH, and the second PTRS port may be associated with at least one second layer of the layers associated with the PUSCH.

[0016] The at least one first layer may be associated with PUSCH antenna ports 1000, 1002, 1004, and 1006. The at least one second layer may be associated with PUSCH antenna ports 1001, 1003, 1005, and 1007.

[0017] Based on the maximum number of the at least one PTRS port being four, the PTRS-DMRS association field may be based on a 4-bit value.

[0018] Each bit value of the 4-bit value may indicate one of two DMRS ports that share each PTRS port among the four PTRS ports.

[0019] The first bit value of the 4-bit value may indicate one of two DMRS ports sharing the first PTRS port. The second bit value of the 4-bit value may indicate one of two DMRS ports sharing the second PTRS port. The third bit value of the 4-bit value may indicate one of two DMRS ports sharing the third PTRS port. The fourth bit value of the 4-bit value may indicate one of two DMRS ports sharing the fourth PTRS port.

[0020] Based on the transmission scheme associated with the PUSCH being set in the codebook, the first PTRS port may be associated with at least one first layer of the layers associated with the PUSCH, the second PTRS port may be associated with at least one second layer of the layers associated with the PUSCH, the third PTRS port may be associated with at least one third layer of the layers associated with the PUSCH, and the fourth PTRS port may be associated with at least one fourth layer of the layers associated with the PUSCH.

[0021] The at least one first layer may be associated with PUSCH antenna ports 1000 and 1004. The at least one second layer may be associated with PUSCH antenna ports 1001 and 1005. The at least one third layer may be associated with PUSCH antenna ports 1002 and 1006. The at least one fourth layer may be associated with PUSCH antenna ports 1003 and 1007.

[0022] The one or more DMRS ports may be indicated based on the eight DMRS ports.

[0023] A terminal operating in a wireless communication system according to another embodiment of the present specification includes one or more transceivers, one or more processors, and one or more memories operably connected to the one or more processors and storing instructions that configure the one or more processors to perform operations based on operations performed by the one or more processors.

[0024] The operations include receiving Downlink Control Information (DCI) for scheduling a Physical Uplink Shared Channel (PUSCH), transmitting a Demodulation Reference Signal (DMRS) based on one or more DMRS ports, transmitting a Phase Tracking Reference Signal (PTRS) based on at least one PTRS port, and transmitting the PUSCH.

[0025] The DCI includes an antenna port field, based on which the one or more DMRS ports are indicated.

[0026] The transmission scheme associated with the PUSCH is set to codebook or non-codebook.

[0027] The number of layers associated with the PUSCH is greater than 4. The DCI includes a PTRS-DMRS association field, which indicates an association between the one or more DMRS ports and the at least one PTRS port.

[0028] Based on the fact that the maximum number of the at least one PTRS port is 1, the PTRS-DMRS association field is characterized by being based on a 3-bit value indicating one of eight DMRS ports.

[0029] An apparatus according to yet another embodiment herein includes one or more memories and one or more processors operatively coupled to the one or more memories.

[0030] The one or more memories contain instructions that configure the one or more processors to perform actions based on what is performed by the one or more processors.

[0031] The operations include receiving Downlink Control Information (DCI) for scheduling a Physical Uplink Shared Channel (PUSCH), transmitting a Demodulation Reference Signal (DMRS) based on one or more DMRS ports, transmitting a Phase Tracking Reference Signal (PTRS) based on at least one PTRS port, and transmitting the PUSCH.

[0032] The DCI includes an antenna port field, based on which the one or more DMRS ports are indicated.

[0033] The transmission scheme associated with the PUSCH is set to codebook or non-codebook.

[0034] The number of layers associated with the PUSCH is greater than 4. The DCI includes a PTRS-DMRS association field, which indicates an association between the one or more DMRS ports and the at least one PTRS port.

[0035] Based on the fact that the maximum number of the at least one PTRS port is 1, the PTRS-DMRS association field is characterized by being based on a 3-bit value indicating one of eight DMRS ports.

[0036] According to yet another embodiment of the present disclosure, one or more non-transitory computer-readable media store one or more instructions.

[0037] One or more instructions executable by one or more processors configure the one or more processors to perform an action.

[0038] The operations include receiving Downlink Control Information (DCI) for scheduling a Physical Uplink Shared Channel (PUSCH), transmitting a Demodulation Reference Signal (DMRS) based on one or more DMRS ports, transmitting a Phase Tracking Reference Signal (PTRS) based on at least one PTRS port, and transmitting the PUSCH.

[0039] The DCI includes an antenna port field, based on which the one or more DMRS ports are indicated.

[0040] The transmission scheme associated with the PUSCH is set to codebook or non-codebook.

[0041] The number of layers associated with the PUSCH is greater than 4. The DCI includes a PTRS-DMRS association field, which indicates an association between the one or more DMRS ports and the at least one PTRS port.

[0042] Based on the fact that the maximum number of the at least one PTRS port is 1, the PTRS-DMRS association field is characterized by being based on a 3-bit value indicating one of eight DMRS ports.

[0043] According to another embodiment of the present specification, a method performed by a base station in a wireless communication system includes transmitting Downlink Control Information (DCI) for scheduling a Physical Uplink Shared Channel (PUSCH), receiving a Demodulation Reference Signal (DMRS) based on one or more DMRS ports, receiving a Phase Tracking Reference Signal (PTRS) based on at least one PTRS port, and receiving the PUSCH.

[0044] The DCI includes an antenna port field, based on which the one or more DMRS ports are indicated.

[0045] The transmission scheme associated with the PUSCH is set to codebook or non-codebook.

[0046] The number of layers associated with the PUSCH is greater than 4. The DCI includes a PTRS-DMRS association field, which indicates an association between the one or more DMRS ports and the at least one PTRS port.

[0047] Based on the fact that the maximum number of the at least one PTRS port is 1, the PTRS-DMRS association field is characterized by being based on a 3-bit value indicating one of eight DMRS ports.

[0048] A base station operating in a wireless communication system according to another embodiment of the present specification includes one or more transceivers, one or more processors, and one or more memories operably connected to the one or more processors and storing instructions that configure the one or more processors to perform operations based on operations performed by the one or more processors.

[0049] The operations include transmitting Downlink Control Information (DCI) for scheduling a Physical Uplink Shared Channel (PUSCH), receiving a Demodulation Reference Signal (DMRS) based on one or more DMRS ports, receiving a Phase Tracking Reference Signal (PTRS) based on at least one PTRS port, and receiving the PUSCH.

[0050] The DCI includes an antenna port field, based on which the one or more DMRS ports are indicated.

[0051] The transmission scheme associated with the PUSCH is set to codebook or non-codebook.

[0052] The number of layers associated with the PUSCH is greater than 4. The DCI includes a PTRS-DMRS association field, which indicates an association between the one or more DMRS ports and the at least one PTRS port.

[0053] Based on the fact that the maximum number of the at least one PTRS port is 1, the PTRS-DMRS association field is characterized by being based on a 3-bit value indicating one of eight DMRS ports. [Effects of the Invention]

[0054] In existing methods, it may be impossible or inaccurate to indicate PTRS-DMRS association for Rank 5 or above, which may result in reduced reliability due to inadequate compensation for phase noise.

[0055] According to an embodiment of the present specification, when the number of layers associated with a PUSCH is greater than four, the PTRS-DMRS association field of the DCI scheduling the corresponding PUSCH may be based on a bit value defined / configured for each maximum number of PTRS ports. If the maximum number of PTRS ports is 1, the PTRS-DMRS association field may be based on a 3-bit value indicating one of eight DMRS ports. If the maximum number of PTRS ports is 2 or 4, the PTRS-DMRS association field may be based on a 4-bit value indicating one of the DMRS ports sharing each PTRS port.

[0056] Therefore, PTRS-DMRS association can be indicated even when the number of layers is 5 or more (Rank 5 or more).

[0057] Furthermore, phase noise can be appropriately compensated for above a certain rank through PTRS-DMRS-related instructions, preventing the aforementioned problem of reduced reliability.

[0058] In addition, since the PTRS-DMRS relationship can be specified according to the maximum number of PTRS ports, flexibility related to PTRS port / setting instructions can be improved.

[0059] The effects obtained in this specification are not limited to those mentioned above, and other effects not mentioned will be clearly understood by those having ordinary skill in the art to which the present invention pertains from the following description. [Brief explanation of the drawings]

[0060] [Figure 1] 1 is a flowchart illustrating an example of a DL DMRS procedure. [Figure 2] 1 is a flowchart illustrating an example of a DL PTRS procedure. [Figure 3] FIG. 10 is a diagram illustrating an example of an uplink transmission and reception operation. [Figure 4] 1 is a flowchart illustrating a method performed by a terminal according to an embodiment of the present disclosure. [Figure 5] 10 is a flowchart illustrating a method performed by a base station according to another embodiment of the present disclosure. [Figure 6] FIG. 2 illustrates a configuration of a first device and a second device according to an embodiment of the present specification. DETAILED DESCRIPTION OF THE INVENTION

[0061] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The detailed description disclosed below, together with the accompanying drawings, is intended to describe exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention can be practiced. The following detailed description includes specific details to provide a thorough understanding of the present invention. However, those skilled in the art will recognize that the present invention can be practiced without such specific details.

[0062] In some cases, well-known structures and devices may be omitted or shown in block diagram form, focusing on the core functions of each structure and device, in order to avoid obscuring the concepts of the present invention.

[0063] Hereinafter, downlink (DL) refers to communication from a base station to a terminal, and uplink (UL) refers to communication from the terminal to the base station. In the downlink, the transmitter may be part of the base station, and the receiver may be part of the terminal. In the uplink, the transmitter may be part of the terminal, and the receiver may be part of the base station. The base station may also be expressed as a first communication device, and the terminal may also be expressed as a second communication device. The base station (BS) may also be replaced with terms such as fixed station, NodeB, evolved-NodeB (eNB), Next Generation NodeB (gNB), base transceiver system (BTS), access point (AP), network (5G network), AI system, road side unit (RSU), vehicle, robot, unmanned aerial vehicle (UAV), augmented reality (AR) device, and virtual reality (VR) device. Furthermore, a terminal may be fixed or mobile, and may be replaced with terms such as UE (User Equipment), MS (Mobile Station), UT (user terminal), MSS (Mobile Subscriber Station), SS (Subscriber Station), AMS (Advance Mobile Station), WT (Wireless terminal), MTC (Machine-Type Communication) device, M2M (Machine-to-Machine) device, D2D (Device-to-Device) device, vehicle, robot, AI module, drone (Unmanned Aerial Vehicle, UAV), AR (Augmented Reality) device, VR (Virtual Reality) device, etc.

[0064] DMRS (demodulation reference signal)

[0065] DMRS reception procedure

[0066] The DMRS-related operations for PDSCH reception will now be described.

[0067] When receiving a PDSCH scheduled according to DCI format 1_0 or when receiving a PDSCH before any dedicated higher layer configuration of the dmrs-AdditionalPosition, maxLength, and dmrs-Type parameters, the terminal assumes that there is no PDSCH in any symbol carrying a DM-RS except for a PDSCH with an allocation duration of 2 symbols having PDSCH mapping type B, that a single-symbol front-loaded DM-RS of configuration type 1 is transmitted on DM-RS port 1000, and that all remaining orthogonal antenna ports are not associated with transmitting a PDSCH to other terminals.

[0068] Furthermore, for a PDSCH having mapping type A, the terminal assumes that dmrs-AdditionalPosition = "pos2" and that up to two additional single-symbol DM-RSs are present in the slot according to the PDSCH duration indicated in the DCI. For a PDSCH having an allocation duration of 7 symbols for a normal CP or 6 symbols for an extended CP with mapping type B, when a front-loaded DM-RS symbol is in the first or second symbol of the PDSCH allocation duration, the terminal assumes that one additional single-symbol DM-RS is present in the fifth or sixth symbol. Otherwise, the terminal assumes that no additional DM-RS symbols are present. For a PDSCH having an allocation duration of 4 symbols with mapping type B, the terminal assumes that no more additional DM-RSs are present. For a PDSCH having an allocation duration of 2 symbols with mapping type B, the terminal assumes that no additional DM-RSs are present and that a PDSCH is present in a symbol carrying a DM-RS.

[0069] When receiving a PDSCH scheduled according to DCI format 1_1 by a PDCCH having a CRC scrambled by a C-RNTI, an MCS-C-RNTI, or a CS (configured scheduling)-RNTI,

[0070] The terminal may be configured in the upper layer parameter dmrs-Type, and the configured DM-RS configuration type is used to receive PDSCH.

[0071] The terminal may be configured with the maximum number of front-loaded DM-RS symbols for the PDSCH according to the higher layer parameter maxLength provided by DMRS-DownlinkConfig.

[0072] The terminal can be scheduled for the number of DM-RS ports according to the antenna port index of DCI format 1_1.

[0073] The DMRS configuration type is set by the dmrs-Type parameter in the DMRS-DownlinkConfig IE in Table 1. DMRS configuration type 1 has higher RS density in the frequency domain and supports up to 4 (8) ports for single (double)-symbol DMRS. DMRS configuration type 1 also supports length-2 F-CDM and FDM for single-symbol DMRS and length-2 F / T-CDM and FDM for double-symbol DMRS. DMRS configuration type 2 supports more DMRS antenna ports and supports up to 6 (12) ports for single (double)-symbol DMRS.

[0074] Table 1 below shows an example of a DMRS-DownlinkConfig IE used to configure the downlink DMRS for the PDSCH.

[0075] [Table 1]

[0076] In Table 1, the dmrs-AdditionalPosition parameter indicates the position for the additional DM-RS in the DL, and if this parameter is not present, the UE applies the value pos2. The Dmrs-Type parameter indicates the selection of the DMRS type to be used for the DL, and if this parameter is not present, the UE uses DMRS type 1. The Max-Length parameter indicates the maximum number of OFDM symbols for the DL front loaded DMRS, and len1 corresponds to the value 1. The PhaseTrackingRS parameter configures the DL PTRS, and if this parameter is not present or is cleared, the UE assumes that there is no DL PTRS.

[0077] Regarding DM-RS setting type 1,

[0078] If a terminal is scheduled with one codeword and the antenna port mapping is assigned to an index of {2, 9, 10, 11, or 30}, or if a terminal is scheduled with two codewords,

[0079] The terminal may assume that none of the remaining orthogonal antenna ports are associated with transmitting PDSCH to other terminals.

[0080] Regarding DM-RS setting type 2,

[0081] If the terminal is scheduled with one codeword and the antenna port mapping is assigned to the index of {2,10,23}, or if the terminal is scheduled with two codewords,

[0082] The terminal may assume that all of the remaining orthogonal antenna ports are not associated with transmitting PDSCH to other terminals.

[0083] FIG. 1 is a flowchart illustrating an example of a DL DMRS procedure.

[0084] The base station transmits DMRS configuration information to the terminal (S110).

[0085] The DMRS configuration information refers to a DMRS-DownlinkConfig IE, which may include a dmrs-Type parameter, a dmrs-AdditionalPosition parameter, a maxLength parameter, a phaseTrackingRS parameter, and the like.

[0086] The dmrs-Type parameter is a parameter for selecting the DMRS configuration type used for DL. In NR, DMRS may be classified into two configuration types: (1) DMRS configuration type 1 and (2) DMRS configuration type 2. DMRS configuration type 1 has higher RS density in the frequency domain, and DMRS configuration type 2 has more DMRS antenna ports.

[0087] The dmrs-AdditionalPosition parameter indicates the position of an additional DMRS in DL. If this parameter is not present, the UE applies the value of pos2. The first position of the front-loaded DMRS is determined according to the PDSCH mapping type (type A or type B), and an additional DMRS may be configured to support high-speed UEs. The front-loaded DMRS occupies one or two consecutive OFDM symbols and is indicated by RRC signaling and downlink control information (DCI).

[0088] The maxLength parameter indicates the maximum number of OFDM symbols for a DL front-loaded DMRS. The phaseTrackingRS parameter is a parameter for setting a DL PTRS. If this parameter does not exist or is cleared, the UE assumes that there is no DL PTRS.

[0089] The base station generates a sequence to be used for the DMRS (S120).

[0090] The sequence for the DMRS is generated by Equation 1 below.

[0091]

number

[0092] The pseudo-random sequence c(i) is defined in 3GPP TS 38.211 5.2.1. That is, c(i) may be a length-31 Gold sequence using two m-sequences. The pseudo-random sequence generator is initialized by the following Equation 2:

[0093]

number

[0094] where: JPEG2025526734000005.jpg8148 is the number of the OFDM symbol in the slot, JPEG2025526734000006.jpg10151 is the slot number within the frame.

[0095] and, JPEG2025526734000007.jpg11150, if provided, is given by the higher-layer parameters scramblingID0 and scramblingID1 in the DMRS-DownlinkConfig IE if the PDSCH is scheduled by a PDCCH using DCI format 1_1 with CRC scrambled by C-RNTI, MCS-C-RNTI, or CS-RNTI, respectively.

[0096] JPEG2025526734000008.jpg12152 is given by the higher-layer parameter scramblingID0 in the DMRS-DownlinkConfig IE if provided and the PDSCH is scheduled by a PDCCH using DCI format 1_0 with CRC scrambled by C-RNTI, MCS-C-RNTI, or CS-RNTI.

[0097] JPEG2025526734000009.jpg12148 Otherwise, quantity JPEG2025526734000010.jpg11150 is given by the DMRS sequence initialization field in the DCI associated with the PDSCH transmission when DCI format 1_1 is used.

[0098] The base station maps the generated sequence to resource elements (S130), where the resource elements may include at least one of time, frequency, antenna port, and code.

[0099] The base station transmits the DMRS to the terminal on the resource element (S140), and the terminal receives a PDSCH using the received DMRS.

[0100] UE DMRS transmission procedure

[0101] DMRS-related operations for PUSCH reception will now be described. As mentioned above, UL refers to signal transmission (or communication) from a terminal to a base station. UL DMRS-related operations are similar to the DL DMRS-related operations described above, and the names of DL-related parameters can be replaced with UL-related parameter names.

[0102] That is, the DMRS-DownlinkConfig IE can be replaced with the DMRS-UplinkConfig IE, the PDSCH mapping type can be replaced with the PUSCH mapping type, and the PDSCH can be replaced with the PUSCH. In addition, in DL DMRS-related operations, the base station can be replaced with the UE, and the UE can be replaced with the base station. Sequence generation for the UL DMRS can be defined differently depending on whether transform precoding is enabled.

[0103] More specifically, DMRS uses a PN sequence when using cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) (or when transform precoding is not enabled), and uses a ZC sequence with a length of 30 or more when using Discrete Fourier Transform-spread-OFDM (DFT-s-OFDM) (when transform precoding is enabled).

[0104] Table 2 below shows an example of a DMRS-UplinkConfig IE used to configure an uplink DMRS for a PUSCH.

[0105] [Table 2]

[0106] In Table 2, the dmrs-AdditionalPosition parameter indicates the position for the additional DM-RS in the UL; if this parameter is not present, the UE applies the value pos2. The Dmrs-Type parameter indicates the selection of the DMRS type to be used for the UL; if this parameter is not present, the UE uses DMRS type 1.

[0107] The Max-Length parameter indicates the maximum number of OFDM symbols for UL front loaded DMRS, and len1 corresponds to a value of 1. The PhaseTrackingRS parameter sets the UL PTRS. The transformPrecodingdisabled parameter indicates DMRS-related parameters for Cyclic Prefix OFDM. The transformPrecodingEnabled parameter indicates DMRS-related parameters for DFT-s-OFDM (Transform Precoding).

[0108] The UE DM-RS transmission procedure will be described in more detail below.

[0109] If the transmitted PUSCH is not scheduled according to DCI format 0_1 having a CRC scrambled by the C-RNTI, CS-RNTI, or MCS-C-RNTI, and does not correspond to a configured grant, the UE uses a single-symbol front-loaded DM-RS of configuration type 1 in DM-RS port 0, and the remaining REs not used for the DM-RS in the symbol are not applied to any PUSCH except for a PUSCH having an allocation duration of 2 or less OFDM symbols with disabled transform precoding. The additional DM-RS can be transmitted according to the scheduling type and PUSCH duration, taking into account whether frequency hopping is enabled.

[0110] If frequency hopping is disabled: The terminal assumes that dmrs-AdditionalPosition is the same as "pos2" and that up to two additional DM-RSs can be transmitted by the PUSCH duration.

[0111] If frequency hopping is enabled: The terminal assumes that dmrs-AdditionalPosition is equal to 'pos1' and that up to one additional DM-RS can be transmitted by the PUSCH duration.

[0112] When the transmitted PUSCH is scheduled using activation DCI format 0_0 with a CRC scrambled by the CS-RNTI, the UE uses a single-symbol front-loaded DM-RS of the configuration type provided by the higher layer parameter dmrs-Type of configuredGrantConfig on DM-RS port 0, and the remaining REs not used for the DM-RS in the symbol are not used for any PUSCH transmission except for a PUSCH having a duration of two or less OFDM allocations with disabled transform precoding, and an additional DM-RS having dmrs-AdditionalPosition from configuredGrantConfig can be transmitted based on the scheduling type and PUSCH duration, taking into account whether frequency hopping is enabled.

[0113] When the transmitted PUSCH corresponds to a scheduled or configured grant with DCI format 0_1 having a CRC scrambled by the C-RNTI, CS-RNTI, or MCS-RNTI,

[0114] The UE may be configured with the upper layer parameter dmrs-Type in DMRS-UplinkConfig, and the configured DM-RS configuration type is used for PUSCH transmission.

[0115] The UE can be configured with the maximum number of front-loaded DM-RS symbols for PUSCH by the upper layer parameter maxLength in DMRS-UplinkConfig.

[0116] If a terminal transmitting a PUSCH is configured with the higher layer parameter PhaseTrackingRS in DMRS-UplinkConfig, the terminal may assume that the next configuration does not occur simultaneously for the transmitted PUSCH.

[0117] For DM-RS configuration type 1 and type 2, any DM-RS port among 4-7 or 6-11 is scheduled for the UE, and the PT-RS is transmitted from the terminal.

[0118] For a PUSCH scheduled by DCI format 0_1, with an activated DCI format 0_1 having a CRC scrambled by CS-RNTI or with a configured grant type 1 setting, the terminal assumes that the DM-RS CDM group is not used for data transmission.

[0119] PTRS (Phase Tracking Reference Signal)

[0120] In the 5G NR standard, the Phase-Tracking Reference Signal (PTRS) is introduced to compensate for the impairment caused by phase noise in the high frequency band, which causes common phase error (CPE) and inter-carrier interference (ICI) in the frequency domain.

[0121] The following describes in detail the operations related to DL PTRS and UL PTRS.

[0122] DL PTRS related operations

[0123] FIG. 2 is a flowchart illustrating an example of a DL PTRS procedure.

[0124] The base station transmits PTRS configuration information to the terminal (S210). The PTRS configuration information indicates a PTRS-DownlinkConfig IE. The PTRS-DownlinkConfig IE may include a frequencyDensity parameter, a timeDensity parameter, an epre-Ratio parameter, a resourceElementOffset parameter, etc.

[0125] The frequencyDensity parameter indicates the presence and frequency density of DL PTRS as a function of the scheduled BW, the timeDensity parameter indicates the presence and time density of DL PTRS as a function of the MCS (modulation and coding scheme), and the epre-Ratio parameter indicates the EPRE (Energy Per Resource Element) between PTRS and PDSCH.

[0126] The base station generates a sequence to be used for the PTRS (S220). The sequence for the PTRS is generated using the DMRS sequence of the same subcarrier as shown in the following Equation 3. The generation of the sequence for the PTRS may be defined differently depending on whether transform precoding is enabled, and the following Equation 3 shows an example when transform precoding is disabled.

[0127]

number

[0128] where: JPEG2025526734000013.jpg9151 is the position JPEG2025526734000014.jpg8152 and the given DMRS at subcarrier k.

[0129] That is, the PTRS sequence uses the DMRS sequence, and more specifically, the PTRS sequence in subcarrier k is the same as the DMRS sequence in subcarrier k.

[0130] The base station maps the generated sequence to resource elements (S230), where the resource elements may include at least one of time, frequency, antenna port, and code.

[0131] The time domain location of the PTRS is mapped to a specific symbol interval starting from the start symbol of the PDSCH allocation, and if a DMRS symbol exists, mapping is performed from the symbol next to the corresponding DMRS symbol. The specific symbol interval may be 1, 2, or 4 symbols.

[0132] With respect to PTRS resource element mapping, the frequency location of the PTRS is determined by the frequency location of the associated DMRS port and the higher layer parameter UL-PTRS-RE-offset, which is included in the PTRS configuration and indicates the subcarrier offset for the UL PTRS for CP-OFDM.

[0133] For DL, a PTRS port is associated with the DMRS port with the lowest index among the scheduled DMRS ports, and for UL, the base station configures which DMRS port is associated with which PTRS port via the UL DCI.

[0134] The base station transmits the PTRS to the terminal on the resource element (S240).

[0135] UL PTRS related operations

[0136] The UL PTRS-related operations are similar to the DL PTRS-related operations described above, and the names of parameters related to the DL PTRS can be replaced with the names of parameters related to the UL PTRS. That is, the PTRS-DownlinkConfig IE can be replaced with the PTRS-UplinkConfig IE, and in the DL PTRS-related operations, the base station can be replaced with the terminal, and the terminal can be replaced with the base station. Similarly, the sequence generation for the PTRS can be defined differently depending on whether transform precoding is enabled.

[0137] Downlink transmit / receive operation

[0138] The base station schedules downlink transmission including frequency / time resources, transmission layers, downlink precoders, MCS, etc. In particular, the base station can determine a beam for PDSCH transmission to a terminal through a beam management operation.

[0139] The terminal then receives downlink control information (DCI) for downlink scheduling (i.e., including scheduling information of the PDSCH) from the base station on the PDCCH. DCI format 1_0 or 1_1 can be used for downlink scheduling, and DCI format 1_1 in particular includes the following information: a DCI format identifier, a bandwidth part indicator, a frequency domain resource assignment, a time domain resource assignment, a PRB bundling size indicator, a rate matching indicator, a ZP CSI-RS trigger, antenna port(s), a transmission configuration indication (TCI), an SRS request, and a DMRS (Demodulation Reference Signal) sequence initialization.

[0140] In particular, the number of DMRS ports is scheduled according to each state / index indicated in the Antenna port(s) field, and single-user (SU) / multi-user (MU) transmission scheduling is possible. Specifically, the order of DMRS ports corresponding to the number of CWs can be predefined according to dmrs-type and maxLength, and the number and / or order of DMRS ports can be indicated via the antenna port field of the DCI.

[0141] The TCI field is composed of 3 bits, and the QCL for the DMRS is dynamically indicated by indicating up to 8 TCI states according to the TCI field value. The terminal receives downlink data from the base station on the PDSCH. When the terminal detects a PDCCH including DCI format 1_0 or 1_1, it decodes the PDSCH according to the instruction of the corresponding DCI.

[0142] Here, when the UE receives a PDSCH scheduled according to DCI format 1_1, the DMRS configuration type is configured in the UE by the upper layer parameter 'dmrs-type', and the DMRS configuration type is used to receive the PDSCH. In addition, the UE can configure the maximum number of front-loaded DMRS symbols for the PDSCH by the upper layer parameter 'maxLength'.

[0143] In the case of DMRS configuration type 1, if a terminal is scheduled with a single codeword and an antenna port mapped with an index of {2, 9, 10, 11, or 30} is specified, or if a terminal is scheduled with two codewords, the terminal assumes that all remaining orthogonal antenna ports are not associated with PDSCH transmission to other terminals. Alternatively, in the case of DMRS configuration type 2, if a terminal is scheduled with a single codeword and an antenna port mapped with an index of {2, 10, or 23} is specified, or if a terminal is scheduled with two codewords, the terminal assumes that all remaining orthogonal antenna ports are not associated with PDSCH transmission to other terminals.

[0144] Uplink transmit and receive operations

[0145] FIG. 3 is a diagram showing an example of an uplink transmission and reception operation.

[0146] 3, the base station schedules uplink transmission including frequency / time resources, transmission layers, uplink precoders, and MCSs (S310). In particular, the base station can determine a beam for a terminal to transmit a PUSCH through a beam management operation. Then, the terminal receives DCI for uplink scheduling (i.e., including scheduling information for the PUSCH) on a PDCCH from the base station (S320). DCI format 0_0 or 0_1 may be used for uplink scheduling. In particular, DCI format 0_1 includes the following information: a DCI format identifier, a supplementary uplink (UL / SUL) indicator, a bandwidth part indicator, a frequency domain resource assignment, a time domain resource assignment, a frequency hopping flag, a modulation and coding scheme (MCS), an SRS resource indicator (SRI), precoding information and the number of layers, antenna port(s), an SRS request, a DMRS sequence initialization, and an uplink shared channel (UL-SCH) indicator.

[0147] In particular, the SRS resource indicator field may indicate an SRS resource configured in an SRS resource set associated with the upper layer parameter 'usage'. In addition, 'spatialRelationInfo' may be configured for each SRS resource, and its value may be one of {CRI, SSB, SRI}.

[0148] Then, the terminal transmits uplink data to the base station on the PUSCH (S330). If the terminal detects a PDCCH including DCI format 0_0 or 0_1, it transmits the corresponding PUSCH according to the instruction of the corresponding DCI. Two transmission methods are supported for PUSCH transmission: codebook-based transmission and non-codebook-based transmission.

[0149] For codebook-based transmission, when the upper layer parameter "txConfig" is set to "codebook," the terminal is configured for codebook-based transmission. On the other hand, when the upper layer parameter "txConfig" is set to "nonCodebook," the terminal is configured for non-codebook-based transmission. If the upper layer parameter "txConfig" is not set, the terminal does not expect to be scheduled using DCI format 0_1. When a PUSCH is scheduled using DCI format 0_0, PUSCH transmission is based on a single antenna port. For codebook-based transmission, a PUSCH can be scheduled using DCI format 0_0, DCI format 0_1, or semi-statically. When this PUSCH is scheduled using DCI format 0_1, the terminal determines a PUSCH transmit precoder based on the SRI, TPMI (Transmit Precoding Matrix Indicator), and transmission rank from the DCI, as given by the SRS resource indicator field and the precoding information and layer number field. The TPMI is used to indicate the precoder to be applied across antenna ports, and corresponds to the SRS resource selected by the SRI when multiple SRS resources are configured. Alternatively, when a single SRS resource is configured, the TPMI is used to indicate the precoder to be applied across antenna ports, and corresponds to the single SRS resource. A transmit precoder is selected from an uplink codebook having the same number of antenna ports as the upper layer parameter "nrofSRS-Ports." When the upper layer in the terminal is set to "codebook" and the parameter "txConfig" is set, the terminal is configured with at least one SRS resource. The SRI indicated in slot n relates to the most recent transmission of the SRS resource identified by the SRI, where the SRS resource precedes the PDCCH (i.e., slot n) carrying the SRI.

[0150] For non-codebook-based transmission, the PUSCH can be scheduled using DCI format 0_0, DCI format 0_1, or semi-statically. When multiple SRS resources are configured, the terminal can determine the PUSCH precoder and transmission rank based on the wideband SRI, where the SRI is given by the SRS resource indicator in the DCI or the higher layer parameter "srs-resource indicator." The terminal uses one or multiple SRS resources for SRS transmission, where the number of SRS resources can be configured for simultaneous transmission within the same RB based on UE capabilities. Only one SRS port is configured per SRS resource. Only one SRS resource can be configured with the higher layer parameter "usage" set to "nonCodebook." The maximum number of SRS resources that can be configured for non-codebook-based uplink transmission is four. The SRI indicated in slot n relates to the most recent transmission on the SRS resource identified by the SRI, where the SRS transmission precedes the PDCCH (ie, slot n) carrying the SRI.

[0151] Multi-TRP (Transmission / Reception Point) related operations

[0152] The M-TRP transmission method, in which M TRPs transmit data to one terminal (User equipment, UE), can be broadly divided into two types: eMBB M-TRP transmission, which is a method for increasing the transmission rate, and ULLCM-TRP transmission, which is a method for increasing the reception success rate and reducing latency.

[0153] In the method proposed herein, DL MTRP-URLLC refers to multiple TRPs transmitting the same data / DCI using different layer / time / frequency resources. For example, TRP1 transmits the same data / DCI on resource 1, and TRP2 transmits the same data / DCI on resource 2. A UE configured with the DL MTRP-URLLC transmission method receives the same data / DCI using different layer / time / frequency resources. In this case, the UE is instructed by the base station which QCL RS / type (i.e., DL TCI state) to use on the layer / time / frequency resource receiving the same data / DCI. For example, if the same data / DCI is received on resource 1 and resource 2, the UE is instructed which DL TCI state to use on resource 1 and which DL TCI state to use on resource 2. Since the UE receives the same data / DCI via resource 1 and resource 2, high reliability can be achieved. Such DL MTRP URLLC can be applied to the PDSCH / PDCCH.

[0154] Conversely, UL MTRP-URLLC means that multiple TRPs receive the same data / UCI from one UE using different layer / time / frequency resources. For example, TRP1 receives the same data / UCI from the UE using resource 1, and TRP2 receives the same data / UCI from the UE using resource 2. The received data / UCI is then shared via the connected backhaul link between the TRPs. A UE configured with the UL MTRP-URLLC transmission method transmits the same data / UCI using different layer / time / frequency resources. In this case, the UE receives instructions from the base station regarding which Tx beam and which Tx power (i.e., UL TCI state) to use on the layer / time / frequency resource for transmitting the same data / UCI. For example, if the same data / UCI is transmitted on resource 1 and resource 2, the UE is instructed on the UL TCI state to use on resource 1 and the UL TCI state to use on resource 2. Such UL MTRP URLLC can be applied to the PUSCH / PUCCH.

[0155] SDCI or MDCI based MTRP transmission

[0156] In addition, from the perspective of downlink control information (DCI) transmission, the M-TRP (multiple TRP) transmission method can be divided into i) M-DCI (multiple DCI) based M-TRP transmission, in which each TRP transmits different DCI, and ii) S-DCI (single DCI) based M-TRP transmission, in which one TRP transmits DCI. For example, in the case of S-DCI, all scheduling information for data transmitted by the M TRP must be transmitted via a single DCI, so it can be used in an ideal BH (ideal BackHaul) environment where dynamic cooperation between two TRPs is possible.

[0157] R16 NR MTRP transmission

[0158] The R16 NR standard supports S-DCI based MTRP PDSCH and M-DCI based MTRP PDSCH transmission methods.

[0159] R16 M-DCI based MTRP PDSCH

[0160] M-DCI-based MTRP PDSCH transmission is a scheme in which each TRP schedules and transmits a PDSCH via DCI. That is, TRP1 transmits PDSCH1 via DCI1, and TRP2 transmits PDSCH2 via DCI2. When PDSCH1 and PDSCH2 overlap in the same frequency-time resource, two PDSCHs are received in the same RE, improving resource efficiency and increasing transmission capacity. To this end, the R16 standard introduces a CORESET pool, which is a group of multiple CORESETs. TRP1 transmits a PDCCH via a CORESET belonging to CORESET pool 0, and TRP1 also transmits the PDSCH scheduled by the PDCCH. TRP2 transmits a PDCCH via a CORESET belonging to CORESET pool 1, and TRP2 also transmits the PDSCH scheduled by the PDCCH. A specific TRP can also schedule PUSCH transmission to a UE via a CORESET belonging to each CORESET pool. For PUCCH, some PUCCH resources are scheduled by TRP1 to receive UCI, and the remaining PUCCH resources are scheduled by TRP2 to receive UCI. In the case of PUSCH and PUCCH, the channels scheduled / used by each TRP are TDM-multiplexed to prevent overlap, so an increase in transmission capacity cannot be expected, but the UE can transmit independent PUSCH / PUCCH to TRP1 and TRP2.

[0161] In addition, the UE can recognize a PUSCH (or PUCCH) scheduled by DCI received in a different CORESET (or a CORESET belonging to a different CORESET group) as a PUSCH (or PUCCH) transmitted via a different TRP, or as a PUSCH (or PUCCH) of a different TRP. In addition, the scheme for UL transmission (e.g., PUSCH / PUCCH) transmitted via a different TRP can be similarly applied to UL transmission (e.g., PUSCH / PUCCH) transmitted via a different panel belonging to the same TRP.

[0162] R17 NR MTRP transmission

[0163] The R17 NR standard supports MTRP PDCCH repeat transmission, MTRP PDCCH / PDSCH SFN transmission, S-DCI based MTRP PUSCH repeat transmission, and single PUCCH resource based MTRP PUCCH repeat transmission. These transmission techniques are all URLLC target enhancements for increased reliability, and the same contents (i.e., DCI, UL TB, or UCI) are repeatedly transmitted. MTRP PDCCH repeat transmission is TDM or FDM repeated transmission, MTRP PDCCH / PDSCH SFN is repeatedly transmitted at the same time / frequency / layer, S-DCI based MTRP PUSCH repeat transmission is TDM, and single PUCCH resource based MTRP PUCCH repeat transmission is TDM repeated transmission.

[0164] R17 MTRP SFN PDCCH

[0165] As a special case of MTRP PDCCH repeated transmission, multiple TRPs may repeatedly transmit the same DCI via the same time / frequency / DMRS port, which is called SFN PDCCH transmission. However, for SFN PDCCH transmission, the base station configures multiple TCI states in one CORESET instead of configuring multiple CORESETs with different TCI states. When the UE receives a PDCCH candidate through an SS set connected to that single CORESET, it performs PDCCH DMRS channel estimation and attempts decoding using all of the corresponding TCI states.

[0166] R17 MTRP SFN PDSCH

[0167] When the MTRP PDSCH is repeatedly transmitted, the two TRPs repeatedly transmit the channel on different resources. However, as a special case, when the two TRPs use the same resources, i.e., when the same channel is repeatedly transmitted via the same frequency, time, and layer (=DMRS port), the reliability of the corresponding channel can also be improved. In this case, the repeatedly transmitted same channel is not separated into resources and is received together over the air, so it is recognized as a single channel from the perspective of the receiving end. In the R17 NR standard, two DL TCI states for PDSCH DMRS reception can be configured for PDSCH SFN transmission.

[0168] For convenience of explanation, this specification applies the proposed method assuming cooperative transmission / reception between two TRPs, but it can be extended to a multi-TRP environment with three or more TRPs and a multi-panel environment. Different TRPs may be recognized as different TCI states in the UE, and when the UE receives / transmits data / DCI / UCI using TCI state 1, it means that the UE receives / transmits data / DCI / UCI from / to TRP 1.

[0169] In this specification, a TO (Transmission Occasion) refers to each channel transmitted at a different time when multiple channels are TDMed, each channel transmitted on a different frequency / RB when FDMed, and each channel transmitted on a different layer / beam / DMRS port when SDMed. One TCI state is mapped to each TO. When the same channel is repeatedly transmitted, complete DCI / data / UCI is transmitted to one TO, and the receiving end receives multiple TOs to increase the success rate of reception.

[0170] R17 SDCI based multi-TB PUSCH / PDSCH scheduling

[0171] R17 NR supports a method in which one DCI simultaneously schedules multiple PUSCHs / PDSCHs in the ultra-high frequency band (beyond 5.26 GHz). For example, multiple TDRAs (=TOs) can be indicated at once via the TDRA field of the PUSCH scheduling DCI, and a different TB is transmitted via the PUSCH for each TO. The FDRA, MCS, TPMI, and SRI values of the DCI are commonly applied to multiple scheduled TBs. In addition, the NDI and RV for each TB are indicated separately via the DCI, and a single HARQ number is indicated, but the numbers increase sequentially in order of the TOs based on the initial TO.

[0172] STxMP (Simultaneous Transmission across Multi-panels) related explanation

[0173] R18 discusses a method for a UE to simultaneously transmit multiple channels / RSs of the same type or multiple channels / RSs of different types. While existing UEs are limited in their ability to transmit multiple channels / RSs simultaneously (e.g., it is possible to simultaneously transmit multiple SRS resources of different SRS sets for UL beam measurement, but not multiple PUSCHs), future advanced UEs will be able to relax this limitation and simultaneously transmit multiple channels or RSs using multiple transmission panels. Such a UE is called a STxMP UE. For example, two PUSCHs corresponding to two UL TBs are scheduled in the same RE, and spatial relation RS 1 and PC parameter Set 1 (i.e., UL TCI state 1) and spatial relation RS 2 and PC parameter Set 2 (i.e., UL TCI state 2) are configured for PUSCH 1 and PUSCH 2 transmission, respectively. The UE transmits PUSCH 1 using panel 1 corresponding to UL TCI state 1, and simultaneously transmits PUSCH 2 using panel 2 corresponding to UL TCI state 2.

[0174] When the base station schedules a PUSCH via DCI, it can indicate whether the corresponding PUSCH is to be transmitted in STxMP, in a single panel, or in MTRP PUSCH repetition. Of course, the corresponding UE must have STxMP capability, and the STxMP mode must be enabled in advance via RRC signaling, etc. For this purpose, the existing SRS resource set indication field can be redefined and used, or a new DCI field can be introduced.

[0175] Unified TCI framework

[0176] In R17, not only the DL TCI state but also the UL TCI state can be indicated via the DL DCI (e.g., DCI format 1-1 or 1-2), or only the UL TCI state can be indicated without indicating the DL TCI state. As a result, the method used for UL beam and power control (PC) configuration in the existing R15 / R16 is replaced by the UL TCI state indication method in R17. More specifically, in R17, one UL TCI state can be indicated via the TCI field of the DL DCI, and the corresponding UL TCI state is applied to all PUSCHs and all PUCCHs after a certain period of time called the beam application time, and can be applied to some or all of the indicated SRS resource sets. For R18, a method of indicating multiple UL TCI states (and / or DL TCI states) via the TCI field of the DL DCI is under discussion.

[0177] The above contents (DMRS, PTRS, UL transmission / reception operations, MTRP-related operations, etc.) may be applied in combination with the methods proposed herein, which will be described later, or may be supplemented to clarify the technical features of the methods proposed herein. The methods described below are merely divided for the convenience of explanation, and it goes without saying that some components of any one method may be substituted for or combined with some components of other methods.

[0178] In this specification, "port" and "antenna port" may be interpreted as having the same meaning. For example, a PTRS (DMRS) port refers to a PTRS (DMRS) antenna port, and vice versa.

[0179] In this specification, "DMRS (or PTRS)" may mean "DM-RS (or PT-RS)", and vice versa.

[0180] Table 3 below shows the agreements related to DMRS enhancement.

[0181] [Table 3]

[0182] In existing NR systems, the maximum number of Tx ports supported for uplink transmission is four (i.e., Rank 4). To obtain greater coverage and higher throughput, 8 Tx UL transmission may be considered in Rel-18. When eight Tx antenna ports are used, there is room for more than four layers for PUSCH transmission. To improve system throughput performance, it is preferable to support up to eight layers (i.e., Rank 8).

[0183] Existing systems can support up to two UL PT-RS ports by considering four partial / non-coherent ports. On the other hand, in the case of eight Tx antenna ports, depending on the antenna implementation, either no coherence among the eight antenna ports or four pairs of coherent antenna ports can be considered. In this case, two PT-RS ports may not be sufficient for phase noise estimation from more than two phase noise sources. Therefore, increasing the maximum number of PT-RS ports is being considered.

[0184] Based on the above background, embodiments for association of DMRS ports and PTRS ports will now be described.

[0185] <Proposal 1>

[0186] The following describes how to associate a corresponding DMRS port with a PTRS port via a DCI.

[0187] As an example, a terminal in the embodiments described below may be a terminal that supports UL transmission based on eight Tx antenna ports and supports Rank 5 or higher. In other words, the embodiments described below can be applied to UL transmission with five or more layers.

[0188] Although the following embodiments are described based on the UE PTRS transmission procedure (UL PTRS), they can also be applied to the PTRS reception procedure (DL PTRS). However, in the PTRS transmission procedure (UL PTRS), the PTRS-DMRS association can be determined for each rank indicated based on the SRI or TPMI.

[0189] The PTRS-DMRS association refers to the association between the PTRS port(s) and the DMRS port(s). For example, the PTRS-DMRS association field of the DCI indicates the association between the PTRS port(s) and the DMRS port(s).

[0190] Table 4 below illustrates the PTRS-DMRS association field of DCI format 0_1 (DCI format 0_2).

[0191] [Table 4]

[0192] Tables 5 to 7 below illustrate examples of tables defined to indicate the association between PTRS port(s) and DMRS port(s) based on Table 4 above.

[0193] [Table 5]

[0194] [Table 6]

[0195] [Table 7]

[0196] According to the existing scheme based on Tables 4 to 7, the PTRS-DMRS association can be indicated as follows.

[0197] Based on the maximum PTRS port being set to one, the PTRS-DMRS association field (2 bits) can indicate the association between one of the 1st scheduled DMRS port to the 4th scheduled DMRS port and the PTRS port (see Tables 4 and 5).

[0198] Based on the maximum PTRS ports being set to two, the MSB (1 bit) (e.g., Most Significant Bit, leftmost bit) of the PTRS-DMRS association field (2 bits) indicates that one of the first or second DMRS ports that share PTRS port 0 is associated with PTRS port 0. The LSB (1 bit) (e.g., Least Significant Bit, rightmost bit) of the PTRS-DMRS association field (2 bits) indicates that one of the first or second DMRS ports that share PTRS port 1 is associated with PTRS port 1 (see Tables 4, 6, and 7).

[0199] The maximum PTRS port may refer to the maximum number of UL PTRS ports indicated by the upper layer parameter maxNrofPorts.

[0200] In the case of NCB PUSCH, the 1st DMRS port and the 2nd DMRS port sharing PTRS port 0 (or PTRS port 1) can be divided / identified as follows.

[0201] In the case of the first DMRS port and the second DMRS port sharing PTRS port 0, the PTRS port index set in the SRS resource indicated by the SRI is 0 (e.g., ptrs-PortIndex in the SRS-Resource is set to n0). In other words, the first DMRS port and the second DMRS port sharing PTRS port 0 can correspond to an SRI field indicating an SRS resource with the PTRS port index set to 0.

[0202] In the case of the first DMRS port and the second DMRS port sharing PTRS port 1, the PTRS port index set in the SRS resource indicated by the SRI is 1 (e.g., ptrs-PortIndex in the SRS-Resource is set to n1). In other words, the first DMRS port and the second DMRS port sharing PTRS port 1 can correspond to an SRI field indicating an SRS resource with a PTRS port index set to 1.

[0203] In the CB PUSCH case, the DMRS ports corresponding to the layer(s) using PUSCH antenna ports 1000 and 1002 share PTRS 0, and the DMRS ports corresponding to the layer(s) using PUSCH antenna ports 1001 and 1003 share PTRS 1.

[0204] The settings / operations related to the above PTRS ports are based on Table 8 below.

[0205] [Table 8]

[0206] As mentioned above, in Release 18, an UL 8Tx UE can support UL transmission of Rank 5 or higher. However, as mentioned above, the existing scheme (Tables 4 to 8) does not support indication of PTRS-DMRS association for Rank 5 or higher.

[0207] To solve the problem that the increased number of DMRS ports (ie, 8 DMRS ports) cannot support PTRS-DMRS association for Rank 5 or higher, the following embodiment is considered.

[0208] According to one embodiment, when the maximum PTRS port is set to one, a (pre-defined / configured) 3-bit table can be utilized instead of the 2-bit table according to Table 5. For example, a 3-bit PTRS-DMRS association field can indicate that one of the 1st scheduled DMRS port through the 8th scheduled DMRS port is associated with the PTRS port. For example, this embodiment can be applied to a full coherent environment. In other words, the (8) DMRS ports can be full coherent antenna ports.

[0209] According to one embodiment, when the maximum PTRS port is set to two, a (predefined / set) 4-bit table can be utilized instead of the 2-bit table based on Table 6 (Table 7) above.

[0210] For example, in the case of an NCB PUSCH, the two most significant bits of the 4-bit PTRS-DMRS association field may indicate that one of the first through fourth DMRS ports sharing PTRS port 0 is associated with the corresponding PTRS port 0. The two least significant bits of the 4-bit PTRS-DMRS association field may indicate that one of the first through fourth DMRS ports sharing PTRS port 1 is associated with the corresponding PTRS port 1.

[0211] For example, in the case of CB PUSCH, 1) DMRS ports corresponding to the layer(s) using PUSCH antenna ports 1000, 1002, 1004, and 1006 (i.e., the first through fourth DMRS ports) may share PTRS port 0, and 2) DMRS ports corresponding to the layer(s) using PUSCH antenna ports 1001, 1003, 1005, and 1007 (i.e., the first through fourth DMRS ports) may share PTRS port 1. The 2 MSB bits of the PTRS-DMRS association field (4 bits) may indicate that one of the first through fourth DMRS ports corresponding to the layer(s) using PUSCH antenna ports 1000, 1002, 1004, and 1006 is associated with PTRS port 0. The 2 LSB bits of the PTRS-DMRS association field (4 bits) can indicate that one of the 1st to 4th DMRS ports corresponding to the layer(s) using PUSCH antenna ports 1001, 1003, 1005, and 1007 is associated with PTRS port 1.

[0212] A specific example of the aforementioned 2 MSBs and 2 LSBs is as follows: When the value of the PTRS-DMRS association field (4 bits) is "0110", i) the 2 MSBs may represent "01", which are the two leftmost bits of the 4 bits, and ii) the 2 LSBs may represent "10", which are the two rightmost bits of the 4 bits.

[0213] In the above-described embodiment, the indicated DMRS port(s) may be, but are not limited to, DMRS port(s) belonging to the same CDM group. The indicated DMRS port(s) may also be DMRS port(s) belonging to different CDM groups.

[0214] The existing scenario in which two PTRS ports are used assumes that the phase noise source is different for each panel or TRP in a multi-panel terminal and / or base station MTRP environment. Taking this into consideration, in an environment with more than four layers, each PTRS port may be designed to be shared by a DMRS port in the same CDM group for each panel / TRP. That is, DMRS port groups (or DMRS ports) that share a PTRS port may be based on the same CDM group.

[0215] The number of CDM groups can be increased depending on the DMRS design method for layers 5 to 8. In this case, the two-port PTRS can be mapped as follows:

[0216] For example, one PTRS (PTRS port) can be mapped to DMRSs (DMRS ports) based on multiple CDM groups.

[0217] For example, two PTRS ports can be mapped to a DMRS port based on a specific CDM group. As a specific example, if there are eight layers and two PTRS ports, each PTRS port can be shared by two layers (two DMRS ports) corresponding to a specific CDM group. Association between two DMRS ports and one PTRS port can be indicated based on the DCI.

[0218] In the second example, the CDM group (or DMRS ports / port group) to which each PTRS port is mapped can be determined based on a rule or the configuration / instruction of the base station. As an example, a rule for the CDM group (DMRS port index) to which each PTRS port is mapped can be defined in advance. As an example, the CDM group (DMRS port index) to which each PTRS port is mapped can be configured / instructed to the terminal by the base station. In this case, the base station can transmit the relevant information (i.e., the CDM group and / or DMRS port index to which each PTRS port is mapped) to the terminal via an RRC message and / or MAC-CE.

[0219] The base station can set / indicate information about the PTRS port to the terminal based on MAC CE and / or RRC signaling.

[0220] <Proposal 2>

[0221] According to the existing method, a maximum of two PTRS ports are supported. According to the present embodiment, a method of increasing and utilizing the maximum number of supported PTRS ports is considered. For example, the maximum number of PTRS ports (e.g., 2) can be doubled to utilize a maximum of four PTRS ports. In this case, the PTRS-DMRS association can be indicated as follows:

[0222] The existing 2-bit table for PTRS-DMRS association (e.g., a table based on Tables 5 to 7) can be extended to a 4-bit table. In other words, a (predefined / configured) 4-bit table can be used to indicate the PTRS-DMRS association.

[0223] The PTRS-DMRS association field (4 bits) can indicate a value defined in the 4-bit table. Specifically, each bit of the PTRS-DMRS association field (4 bits) can indicate a PTRS-DMRS association as follows [1] to [4].

[0224] [1] One bit of the PTRS-DMRS association field (4 bits) can indicate that one of the first DMRS port and the second DMRS port that share PTRS port 0 is associated with the corresponding PTRS port 0.

[0225] [2] One bit of the PTRS-DMRS association field (4 bits) can indicate that one of the first DMRS port and the second DMRS port that share PTRS port 1 is associated with the corresponding PTRS port 1.

[0226] [3] One bit of the PTRS-DMRS association field (4 bits) can indicate that one of the first DMRS port and the second DMRS port that share PTRS port 2 is associated with the corresponding PTRS port 2.

[0227] [4] One bit of the PTRS-DMRS association field (4 bits) can indicate that one of the first DMRS port and the second DMRS port that share PTRS port 3 is associated with the corresponding PTRS port 3.

[0228] In the case of NCB PUSCH, the first DMRS port and the second DMRS port sharing each PTRS port among PTRS port 0 to PTRS port 3 can be set to the same value as described above. That is, the DMRS port(s) of the same channel as the corresponding SRS resource can be grouped depending on whether the PTRS port index set for the indicated SRS resource is a value of 0, 1, 2, or 3. As an example, the DMRS port(s) of the same channel as the corresponding SRS resource may refer to the DMRS port(s) corresponding to the SRI field indicating the corresponding SRS resource.

[0229] In the case of CB PUSCH, the DMRS ports that share PTRS ports 0 to 3 can be configured as follows:

[0230] DMRS ports (1st DMRS port and 2nd DMRS port) corresponding to layers using PUSCH antenna ports 1000 and 1004 can share PTRS port 0.

[0231] DMRS ports (1st DMRS port and 2nd DMRS port) corresponding to layers using PUSCH antenna ports 1001 and 1005 can share PTRS port 1.

[0232] DMRS ports (1st DMRS port and 2nd DMRS port) corresponding to layers using PUSCH antenna ports 1002 and 1006 can share PTRS port 2.

[0233] DMRS ports (1st DMRS port and 2nd DMRS port) corresponding to layers using PUSCH antenna ports 1003 and 1007 can share PTRS port 3.

[0234] In the above-described embodiment, the indicated DMRS port(s) may be, but are not limited to, DMRS port(s) belonging to the same CDM group, and the indicated DMRS port(s) may be DMRS port(s) belonging to different CDM groups.

[0235] <Proposal 3>

[0236] It is assumed that the number of Tx antenna ports supported by the terminal is 8, but only up to 4 layers are supported. In this case, the following operation may be applied.

[0237] If the maximum PTRS port is set to 1, the indication of the PTRS-DMRS association may be performed as described above. If the maximum PTRS port is set to 2, the previously defined table for indicating the PTRS-DMRS association may be used as is.

[0238] However, in the case of CB PUSCH, the layer(s) associated with each PTRS port must be configured to be distinct. For example, the DMRS port shared by each PTRS port for PTRS-DMRS association can be defined / distinguished / configured by layer as follows [1] and [2].

[0239] [1] DMRS ports corresponding to layers using PUSCH antenna ports 1000, 1002, 1004, and 1006 can share PTRS port 0.

[0240] [2] DMRS ports corresponding to layers using PUSCH antenna ports 1001, 1003, 1005, and 1007 can share PTRS port 1.

[0241] When the maximum PTRS port is set to 4, each DMRS port among the 1st scheduled DMRS port through the 4th scheduled DMRS port can be mapped 1:1 to each PTRS port (i.e., one of PTRS ports 0 to 3). For example, in rank 1, there is only the 1st scheduled DMRS port, so it can be concatenated / mapped to PTRS port 0. In this case, the actual number of PTRS ports is determined to be 1. In rank 2, i) the 1st DMRS port and the 2nd DMRS port are concatenated / mapped to ii) PTRS port 0 and PTRS port 1, respectively. In rank 3, i) the 1st DMRS port, the 2nd DMRS port, and the 3rd DMRS port are concatenated / mapped to ii) PTRS port 0, PTRS port 1, and PTRS port 2, respectively. In other words, in such cases, the PTRS-DMRS association field for indicating the PTRS-DMRS association may not be used.

[0242] In practical terms, the operation of the base station / terminal according to the above-described embodiments (e.g., operation based on at least one of Proposal 1 to Proposal 3) can be processed by the apparatus (e.g., 100, 200) of Figure 6 described below.

[0243] In addition, the operation of the base station / terminal according to the above-mentioned embodiments (e.g., operation based on at least one of Proposal 1 to Proposal 3) can also be stored in a memory (e.g., 140, 240 in FIG. 6) in the form of an instruction / program (e.g., instruction, executable code) for driving at least one processor (e.g., 110, 210 in FIG. 6).

[0244] Hereinafter, the above-mentioned embodiment will be described in detail in terms of the operation of a terminal and a base station with reference to Figures 4 and 5. The methods described below are merely divided for the convenience of explanation, and it goes without saying that some components of any one method can be substituted for some components of another method or can be mutually combined and applied.

[0245] FIG. 4 is a flowchart illustrating a method performed by a terminal according to an embodiment of the present specification.

[0246] As shown in FIG. 4, the method performed by a terminal in a wireless communication system according to one embodiment of this specification includes a DCI receiving step (S410), a DMRS transmitting step (S420), a PTRS transmitting step (S430), and a PUSCH transmitting step (S440).

[0247] At S410, the UE receives Downlink Control Information (DCI) for scheduling a Physical Uplink Shared Channel (PUSCH) from the base station. The DCI may include an antenna port field. One or more Demodulation Reference Signal (DMRS) ports may be indicated based on the antenna port field.

[0248] According to one embodiment, a transmission scheme associated with the PUSCH may be set to codebook or non-codebook. The number of layers associated with the PUSCH may be greater than 4. For example, a Rank associated with the PUSCH may be greater than or equal to 5.

[0249] At S420, the terminal transmits a DMRS to the base station based on the one or more DMRS ports.

[0250] In S430, the terminal transmits a Phase Tracking Reference Signal (PTRS) to the base station based on at least one PTRS port.

[0251] According to one embodiment, the DCI may include a PTRS-DMRS association field, which may indicate an association between the one or more DMRS ports and the at least one PTRS port.

[0252] According to one embodiment, the maximum number of said at least one PTRS port is 1, based on which:

[0253] The PTRS-DMRS association field may be based on a 3-bit value indicating one of eight DMRS ports. This embodiment may be based on Proposal 1 above.

[0254] According to one embodiment, the maximum number of said at least one PTRS port is two, based on which:

[0255] The PTRS-DMRS association field may be based on a 4-bit value. This embodiment may be based on Proposal 1.

[0256] Two bits of the 4-bit value (eg, the MSB 2 bits) can indicate one of the four DMRS ports that share the first PTRS port.

[0257] The remaining 2-bit value (eg, LSB 2 bits) of the 4-bit value can indicate one of the four DMRS ports that share the second PTRS port.

[0258] Based on the fact that a transmission scheme related to the PUSCH is set in the codebook:

[0259] The first PTRS port may be associated with at least one first layer of layers associated with the PUSCH;

[0260] The second PTRS port may be associated with at least one second layer of the layers associated with the PUSCH.

[0261] The at least one first layer may be associated with PUSCH antenna ports 1000, 1002, 1004, and 1006. The at least one second layer may be associated with PUSCH antenna ports 1001, 1003, 1005, and 1007.

[0262] According to one embodiment, the maximum number of said at least one PTRS port is four, based on which:

[0263] The PTRS-DMRS association field may be based on a 4-bit value. This embodiment may be based on Proposal 2.

[0264] Each bit value of the 4-bit value can indicate one of two DMRS ports that share each PTRS port among the four PTRS ports. This will be explained in more detail below.

[0265] The first bit value of the 4-bit value may indicate one of the two DMRS ports that share the first PTRS port.

[0266] The second bit value of the 4-bit value can indicate one of the two DMRS ports that share the second PTRS port.

[0267] The third bit value of the 4-bit value can indicate one of the two DMRS ports that share the third PTRS port.

[0268] The fourth bit of the 4-bit value can indicate one of the two DMRS ports that share the fourth PTRS port.

[0269] For example, the first to fourth bit values may be classified in order from the most significant bit (MSB) to the least significant bit (LSB) of the 4-bit value, i.e., the MSB of the 4-bit value may be the first bit value, and the LSB of the 4-bit value may be the fourth bit value.

[0270] For example, the first to fourth bit values may be classified in order from the LSB to the MSB of the 4-bit value, i.e., the LSB of the 4-bit value may be the first bit value, and the MSB of the 4-bit value may be the fourth bit value.

[0271] Based on the transmission scheme associated with the PUSCH being set in the codebook:

[0272] The first PTRS port may be associated with at least one first layer of layers associated with the PUSCH;

[0273] The second PTRS port may be associated with at least one second layer of the layers associated with the PUSCH;

[0274] The third PTRS port may be associated with at least one third layer of the layers associated with the PUSCH;

[0275] The fourth PTRS port may be associated with at least one fourth layer of the layers associated with the PUSCH.

[0276] The at least one first layer may be associated with PUSCH antenna ports 1000 and 1004. The at least one second layer may be associated with PUSCH antenna ports 1001 and 1005. The at least one third layer may be associated with PUSCH antenna ports 1002 and 1006. The at least one fourth layer may be associated with PUSCH antenna ports 1003 and 1007.

[0277] According to one embodiment, the one or more DMRS ports may be indicated based on the eight DMRS ports, i.e., one or more of the eight DMRS ports may be indicated based on the antenna port field.

[0278] At S440, the terminal transmits the PUSCH to the base station.

[0279] The operations according to S410 to S440 described above may be implemented by the apparatus of Figure 6. For example, terminal 200 may control one or more transceivers 230 and / or one or more memories 240 to perform the operations according to S410 to S440.

[0280] Some steps may be omitted or added in the method. For example, the operation according to S440 may be omitted in the method.

[0281] The above-described embodiment will now be described in detail from the perspective of base station operation.

[0282] S510 to S540 described below correspond to S410 to S440 described in FIG. 4. In consideration of this correspondence, duplicated descriptions will be omitted. That is, detailed descriptions regarding the operations of the base station described below may be replaced with the descriptions / embodiments of FIG. 4 corresponding to the corresponding operations. As an example, the descriptions / embodiments of S410 to S440 in FIG. 4 may be additionally applied to the base station operations of S510 to S540 described below.

[0283] FIG. 5 is a flowchart illustrating a method performed by a base station according to another embodiment of the present disclosure.

[0284] As shown in FIG. 5, a method performed by a base station in a wireless communication system according to another embodiment of the present specification includes a DCI transmission step (S510), a DMRS reception step (S520), a PTRS reception step (S530), and a PUSCH reception step (S540).

[0285] At S510, the base station transmits downlink control information (DCI) for scheduling a physical uplink shared channel (PUSCH) to the terminal. The DCI may include an antenna port field. One or more demodulation reference signal (DMRS) ports may be indicated based on the antenna port field.

[0286] At S520, the base station receives a DMRS from the terminal based on the one or more DMRS ports.

[0287] In S530, the base station receives a Phase Tracking Reference Signal (PTRS) from the terminal based on at least one PTRS port.

[0288] At S540, the base station receives the PUSCH from the terminal.

[0289] The operations according to S510 to S540 described above may be implemented by the apparatus of Figure 6. For example, the base station 100 may control one or more transceivers 130 and / or one or more memories 140 to perform the operations according to S510 to S540.

[0290] Some steps may be omitted or added in the method. For example, the operation according to S540 may be omitted in the method.

[0291] An apparatus to which the embodiments of the present specification can be applied (an apparatus that implements the methods / operations according to the embodiments of the present specification) will be described below with reference to FIG.

[0292] FIG. 6 is a diagram illustrating the configuration of a first device and a second device according to an embodiment of the present specification.

[0293] The first device 100 may include a processor 110 , an antenna unit 120 , a transceiver 130 , and a memory 140 .

[0294] The processor 110 performs baseband-related signal processing and may include an upper layer processing unit 111 and a physical layer processing unit 115. The upper layer processing unit 111 may process operations of the MAC layer, the RRC layer, or higher layers. The physical layer processing unit 115 may process operations of the PHY layer. For example, when the first device 100 is a base station device in base station-terminal communication, the physical layer processing unit 115 may perform uplink reception signal processing, downlink transmission signal processing, etc. For example, when the first device 100 is a first terminal device in terminal-terminal communication, the physical layer processing unit 115 may perform downlink reception signal processing, uplink transmission signal processing, sidelink transmission signal processing, etc. In addition to performing baseband-related signal processing, the processor 110 may also control the overall operation of the first device 100.

[0295] The antenna unit 120 may include one or more physical antennas, and when multiple antennas are included, it may support MIMO transmission and reception. The transceiver 130 may include an RF (Radio Frequency) transmitter and an RF receiver. The memory 140 may store information processed by the processor 110, as well as software, an operating system, applications, etc. related to the operation of the first device 100, and may also include components such as buffers.

[0296] The processor 110 of the first device 100 can be configured to implement the operation of a base station in base station-terminal communication (or the operation of a first terminal device in terminal-terminal communication) in the embodiments described in this disclosure.

[0297] The second device 200 may include a processor 210 , an antenna unit 220 , a transceiver 230 , and a memory 240 .

[0298] The processor 210 performs baseband-related signal processing and may include an upper layer processing unit 211 and a physical layer processing unit 215. The upper layer processing unit 211 can process operations of the MAC layer, the RRC layer, or higher layers. The physical layer processing unit 215 can process operations of the PHY layer. For example, when the second device 200 is a terminal device in base station-terminal communication, the physical layer processing unit 215 can perform downlink reception signal processing, uplink transmission signal processing, etc. For example, when the second device 200 is a second terminal device in terminal-terminal communication, the physical layer processing unit 215 can perform downlink reception signal processing, uplink transmission signal processing, sidelink reception signal processing, etc. In addition to performing baseband-related signal processing, the processor 210 can also control the overall operation of the second device 200.

[0299] The antenna unit 220 may include one or more physical antennas, and when multiple antennas are included, it may support MIMO transmission and reception. The transceiver 230 may include an RF transmitter and an RF receiver. The memory 240 may store information processed by the processor 210, as well as software, an operating system, applications, etc. related to the operation of the second device 200, and may also include components such as buffers.

[0300] The processor 210 of the second device 200 may be configured to implement the operation of a terminal in base station-terminal communication (or the operation of a second terminal device in terminal-terminal communication) in the embodiments described in this disclosure.

[0301] In the operation of the first device 100 and the second device 200, the matters described in the examples of the present disclosure regarding the base station and terminal in base station-terminal communication (or the first terminal and second terminal in terminal-terminal communication) can be equally applied, and duplicate explanations will be omitted.

[0302] Here, the wireless communication technology implemented by the devices 100 and 200 of the present disclosure may include not only LTE, NR, and 6G, but also Narrowband Internet of Things (NB-IoT) for low-power communication. For example, the NB-IoT technology is an example of a Low Power Wide Area Network (LPWAN) technology, and can be implemented by standards such as LTE Cat NB1 and / or LTE Cat NB2, and is not limited to the aforementioned names.

[0303] Additionally or alternatively, the wireless communication technology implemented in the devices 100 and 200 of the present disclosure may perform communication based on LTE-M technology. For example, LTE-M technology is an example of LPWAN technology and is referred to by various names such as enhanced machine type communication (eMTC). For example, LTE-M technology may be implemented by at least one of various standards such as 1) LTE CAT 0, 2) LTE Cat M1, 3) LTE Cat M2, 4) LTE non-BL (non-Bandwidth Limited), 5) LTE-MTC, 6) LTE Machine Type Communication, and / or 7) LTE M, and is not limited to the above names.

[0304] Additionally or alternatively, the wireless communication technology implemented in the devices 100 and 200 of the present disclosure may include at least one of ZigBee (registered trademark), Bluetooth (registered trademark), and a Low Power Wide Area Network (LPWAN), which consider low-power communication, but is not limited to the aforementioned names. For example, ZigBee technology can create personal area networks (PANs) related to small / low-power digital communication based on various standards such as IEEE 802.15.4, and may be called by various names.

Claims

1. 1. A method performed by a terminal in a wireless communication system, comprising: receiving downlink control information (DCI) for scheduling a physical uplink shared channel (PUSCH); The DCI includes an antenna port field, and one or more demodulation reference signal (DMRS) ports are indicated based on the antenna port field; transmitting a DMRS based on the one or more DMRS ports; transmitting a Phase Tracking Reference Signal (PTRS) based on at least one PTRS port; and transmitting the PUSCH, A transmission scheme related to the PUSCH is set to a codebook or a non-codebook, The number of layers associated with the PUSCH is greater than 4; The DCI includes a PTRS-DMRS association field, The PTRS-DMRS association field indicates an association between the one or more DMRS ports and the at least one PTRS port; Based on the maximum number of the at least one PTRS port being 1, The method, wherein the PTRS-DMRS association field is based on a 3-bit value indicating one of eight DMRS ports.

2. Based on the maximum number of the at least one PTRS port being two, The method of claim 1, wherein the PTRS-DMRS association field is based on a 4-bit value.

3. A 2-bit value of the 4-bit value indicates one of the four DMRS ports that share the first PTRS port; The method of claim 2 , wherein the remaining 2-bit value of the 4-bit value indicates one of four DMRS ports that share the second PTRS port.

4. Based on the fact that a transmission scheme related to the PUSCH is set in the codebook, The first PTRS port is associated with at least one first layer of layers associated with the PUSCH; 4. The method of claim 3, wherein the second PTRS port is associated with at least one second layer of layers associated with the PUSCH.

5. the at least one first layer is associated with PUSCH antenna ports 1000, 1002, 1004, and 1006; 5. The method of claim 4, wherein the at least one second layer is associated with PUSCH antenna ports 1001, 1003, 1005 and 1007.

6. Based on the maximum number of the at least one PTRS port being four, The method of claim 1, wherein the PTRS-DMRS association field is based on a 4-bit value.

7. The method of claim 2 , wherein each bit value of the 4-bit value indicates one of two DMRS ports that share each PTRS port among four PTRS ports.

8. A first bit value of the 4-bit value indicates one of two DMRS ports sharing the first PTRS port; a second bit value of the 4-bit value indicating one of two DMRS ports sharing the second PTRS port; A third bit value of the 4-bit value indicates one of two DMRS ports sharing the third PTRS port; The method of claim 7 , wherein a fourth bit value of the 4-bit value indicates one of two DMRS ports that share a fourth PTRS port.

9. Based on the fact that a transmission scheme related to the PUSCH is set in the codebook, The first PTRS port is associated with at least one first layer of layers associated with the PUSCH; The second PTRS port is associated with at least one second layer of the layers associated with the PUSCH; The third PTRS port is associated with at least one third layer of layers associated with the PUSCH; 9. The method of claim 8, wherein the fourth PTRS port is associated with at least one fourth layer of layers associated with the PUSCH.

10. the at least one first layer is associated with PUSCH antenna ports 1000 and 1004; the at least one second layer is associated with PUSCH antenna ports 1001 and 1005; the at least one third layer is associated with PUSCH antenna ports 1002 and 1006; 10. The method of claim 9, wherein the at least one fourth layer is associated with PUSCH antenna ports 1003 and 1007.

11. 2. The method of claim 1, wherein the one or more DMRS ports are indicated based on the eight DMRS ports.

12. 1. A terminal operating in a wireless communication system, comprising: one or more transceivers; one or more processors; and one or more memories operably connected to the one or more processors and storing instructions that configure the one or more processors to perform actions based on being performed by the one or more processors; The operation is receiving downlink control information (DCI) for scheduling a physical uplink shared channel (PUSCH); The DCI includes an antenna port field, and one or more demodulation reference signal (DMRS) ports are indicated based on the antenna port field; transmitting a DMRS based on the one or more DMRS ports; transmitting a Phase Tracking Reference Signal (PTRS) based on at least one PTRS port; and transmitting the PUSCH, A transmission scheme related to the PUSCH is set to a codebook or a non-codebook, The number of layers associated with the PUSCH is greater than 4; The DCI includes a PTRS-DMRS association field, The PTRS-DMRS association field indicates an association between the one or more DMRS ports and the at least one PTRS port; Based on the maximum number of the at least one PTRS port being 1, The terminal is characterized in that the PTRS-DMRS association field is based on a 3-bit value indicating one of eight DMRS ports.

13. 1. An apparatus comprising: one or more memories; and one or more processors operatively coupled to the one or more memories, the one or more memories contain instructions that, when executed by the one or more processors, configure the one or more processors to perform actions; The operation is receiving downlink control information (DCI) for scheduling a physical uplink shared channel (PUSCH); The DCI includes an antenna port field, and one or more demodulation reference signal (DMRS) ports are indicated based on the antenna port field; transmitting a DMRS based on the one or more DMRS ports; transmitting a Phase Tracking Reference Signal (PTRS) based on at least one PTRS port; and transmitting the PUSCH, A transmission scheme related to the PUSCH is set to a codebook or a non-codebook, The number of layers associated with the PUSCH is greater than 4; The DCI includes a PTRS-DMRS association field, The PTRS-DMRS association field indicates an association between the one or more DMRS ports and the at least one PTRS port; Based on the maximum number of the at least one PTRS port being 1, The PTRS-DMRS association field is based on a 3-bit value indicating one of eight DMRS ports.

14. one or more non-transitory computer-readable media storing one or more instructions; one or more instructions executable by one or more processors to configure the one or more processors to perform an operation; The operation is receiving downlink control information (DCI) for scheduling a physical uplink shared channel (PUSCH); The DCI includes an antenna port field, and one or more demodulation reference signal (DMRS) ports are indicated based on the antenna port field; transmitting a DMRS based on the one or more DMRS ports; transmitting a Phase Tracking Reference Signal (PTRS) based on at least one PTRS port; and transmitting the PUSCH, A transmission scheme related to the PUSCH is set to a codebook or a non-codebook, The number of layers associated with the PUSCH is greater than 4; The DCI includes a PTRS-DMRS association field, The PTRS-DMRS association field indicates an association between the one or more DMRS ports and the at least one PTRS port; Based on the maximum number of the at least one PTRS port being 1, One or more non-transitory computer-readable media, wherein the PTRS-DMRS association field is based on a 3-bit value that indicates one of eight DMRS ports.

15. 1. A method performed by a base station in a wireless communication system, comprising: transmitting downlink control information (DCI) for scheduling a physical uplink shared channel (PUSCH); The DCI includes an antenna port field, and one or more demodulation reference signal (DMRS) ports are indicated based on the antenna port field; receiving a DMRS based on the one or more DMRS ports; receiving a Phase Tracking Reference Signal (PTRS) based on at least one PTRS port; and receiving the PUSCH, A transmission scheme related to the PUSCH is set to a codebook or a non-codebook, The number of layers associated with the PUSCH is greater than 4; The DCI includes a PTRS-DMRS association field, The PTRS-DMRS association field indicates an association between the one or more DMRS ports and the at least one PTRS port; Based on the maximum number of the at least one PTRS port being 1, The method, wherein the PTRS-DMRS association field is based on a 3-bit value indicating one of eight DMRS ports.

16. 1. A base station operating in a wireless communication system, comprising: one or more transceivers; one or more processors; and one or more memories operably connected to the one or more processors and storing instructions that, when executed by the one or more processors, configure the one or more processors to perform operations; The operation is transmitting downlink control information (DCI) for scheduling a physical uplink shared channel (PUSCH); The DCI includes an antenna port field, and one or more demodulation reference signal (DMRS) ports are indicated based on the antenna port field; receiving a DMRS based on the one or more DMRS ports; receiving a Phase Tracking Reference Signal (PTRS) based on at least one PTRS port; and receiving the PUSCH, A transmission scheme related to the PUSCH is set to a codebook or a non-codebook, The number of layers associated with the PUSCH is greater than 4; The DCI includes a PTRS-DMRS association field, The PTRS-DMRS association field indicates an association between the one or more DMRS ports and the at least one PTRS port; Based on the maximum number of the at least one PTRS port being 1, The base station is characterized in that the PTRS-DMRS association field is based on a 3-bit value indicating one of eight DMRS ports.

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