PT-RS for PUSCH transmission to multiple TRPs

Abstract

In one embodiment, a method performed by a wireless device includes receiving downlink control information (DCI) that is repeated to a Transmit / Receive Point (TRP) for scheduling a Physical Uplink Shared Channel (PUSCH), wherein the PUSCH is configured with a maximum rank greater than 2. The DCI includes an antenna port field indicating two or more demodulation reference signal (DMRS) ports and a single PTRS-DMRS association field or one of two PTRS-DMRS association fields. The method further includes determining, based on the most significant bit (MSB) of the single PTRS-DMRS association field or a first PTRS-DMRS association field, a DMRS port associated with a phase tracking reference signal (PTRS) port for transmission to the PUSCH of a first TRP, and determining, based on the least significant bit (LSB) of the single PTRS-DMRS association field or a second PTRS-DMRS association field, a DMRS port associated with a PTRS port for transmission to the PUSCH of a second TRP.

Description

[0001] Related applications

[0002] This application claims the benefit of provisional patent application serial number 63 / 170,023, filed on April 2, 2021, the disclosure of which is incorporated herein by reference in its entirety. Technical Field

[0003] This disclosure relates to cellular communication systems, such as, for example, the 3GPP 5th Generation System (5GS), and more specifically, to a phase tracking reference signal (PT-RS) for Physical Uplink Shared Channel (PUSCH) transmission. Background Technology

[0004] 1. New Radio (NR) Frame Structure and Resource Grid

[0005] The 3GPP New Radio (NR) uses Cyclic Prefix Orthogonal Frequency Division Multiplexing (CP-OFDM) in both the downlink (i.e., from a network node, gNB, or base station to a user equipment or UE) and the uplink (i.e., from a UE to a gNB). Discrete Fourier Transform (DFT) Extended Orthogonal Frequency Division Multiplexing (OFDM) is also supported in the uplink. In the time domain, NR downlink and uplink are organized into equal-sized subframes, each lasting 1 millisecond (ms). Subframes are further divided into multiple time slots of equal duration. The time slot length depends on the subcarrier spacing. For a subcarrier spacing of Δf = 15 kHz, each subframe has only one time slot, and each time slot includes 14 OFDM symbols. Figure 1 The NR time-domain structure with a 15kHz subcarrier spacing is shown.

[0006] Data scheduling in NR is typically based on time slots. Figure 1 The example shown is a time slot with 14 symbols, where the first two symbols contain the Physical Downlink Control Channel (PDCCH) and the remaining symbols contain the Physical Shared Data Channel, which is either the Physical Downlink Shared Channel (PDSCH) or the Physical Uplink Shared Channel (PUSCH).

[0007] NR supports different subcarrier spacing values. The supported subcarrier spacing values ​​(also known as different digital basic configurations) are determined by Δf = (15 × 2) / 2. μ )kHz represents the basic subcarrier spacing, where μ∈0,1,2,3,4. Δf=15kHz is the basic subcarrier spacing. The time slot duration at different subcarrier spacings is determined by… express.

[0008] In the frequency domain, the system bandwidth is divided into resource blocks (RBs), each corresponding to 12 consecutive subcarriers. RBs are numbered starting from 0 at one end of the system bandwidth. Figure 2 The diagram illustrates the basic NR physical time-frequency resource grid, showing only one RB within a 14-symbol time slot. One OFDM subcarrier during an OFDM symbol interval forms one resource element (RE).

[0009] Uplink (UL) transmissions can be dynamically scheduled via uplink grants in downlink control information (DCI) carried on the physical downlink control channel (PDCCH).

[0010] 2PUSCH transmission scheme

[0011] In NR, two transmission schemes are specified for PUSCH: codebook-based and non-codebook-based.

[0012] 2.1 Codebook-based PUSCH

[0013] If the high-level parameter txConfig = codebook, then codebook-based PUSCH is enabled. For dynamically scheduled PUSCH and configuration-authorized PUSCH type 2, the codebook-based PUSCH transport scheme can be summarized as follows:

[0014] The UE transmits a Sound Reference Signal (SRS) configured in the SRS resource set, where the higher-layer parameter usage is set to "CodeBook". Note that only one SRS resource set can be configured for the "CodeBook" usage. A maximum of two SRS resources can be configured in an SRS resource set, and each SRS resource can have a maximum of four antenna ports.

[0015] The gNB determines the number of layers (or ranks) and the preferred precoder (i.e., transmit precoder matrix indicator (TPMI)) based on the SRS received from one of the SRS resources (multiple) of the codebook subset.

[0016] If two SRS resources are configured in the SRS resource set, the gNB indicates the selected SRS resource through the 1-bit "SRS Resource Indicator" (SRI) field in the DCI of the scheduling PUSCH. If only one SRS resource is configured in the SRS resource set, the "SRS Resource Indicator" field is not present in the DCI.

[0017] • gNB also indicates the preferred TPMI and associated layer number of the PUSCH associated with the indicated SRS resource.

[0018] • The UE performs PUSCH transmission using the TPMI and layer number indicated on the SRS antenna port.

[0019] • The number of demodulation reference signal (DMRS) ports associated with (multiple) layers is indicated in the “Antenna Port” field of the DCI along with the number of code division multiplexing (CDM) groups without data.

[0020] A subset of the codebook can be one of the following:

[0021] • Fully coherent, partially coherent, and non-coherent

[0022] Partially coherent and non-coherent.

[0023] • Noncoherent

[0024] And it is configured based on the ability to report UEs.

[0025] Note that in NR, an antenna port is defined as the channel through which a symbol transmitted on an antenna port passes, which can be inferred from the channel through which another symbol transmitted on the same antenna port passes. In the uplink, DMRS antenna ports used for PUSCH begin with 0 and SRS, while PUSCH antenna ports begin with 1000.

[0026] 2.2 PUSCH Based on Non-Codebook

[0027] Non-codebook-based PUSCH transmission is used for reciprocity-based UL transmission, where SRS precoding is derived at the UE based on a configured Downlink (DL) Channel State Information Reference Signal (CSI-RS). The UE can measure and derive precoder weights suitable for SRS transmission from the DL CSI-RS, thereby generating one or more (virtual) SRS ports, each corresponding to a spatial layer. The UE can be configured with up to four SRS resources in an SRS resource set, each with one (virtual) SRS port. The UE can transmit SRS from up to four SRS resources, and the gNB measures the UL channel based on the received SRS and determines (multiple) preferred SRS resources. Subsequently, the gNB indicates the selected SRS resource via an SRS Resource Indicator (SRI). Note that only one SRS resource set can be configured for "non-codebook" use.

[0028] 3. Demodulation reference signal (DMRS or DM-RS) for PUSCH

[0029] DMRS is used for PUSCH demodulation purposes. DMRS is limited to resource blocks allocated to PUSCH.

[0030] The mapping from DMRS to resource elements is configurable in both the frequency and time domains. In the frequency domain, there are two mapping types, namely Type 1 or Type 2, which are configured by the high-level parameter dmrs-Type in DMRS-UplinkConfig.

[0031] DMRS mapping in the time domain can be based on a single symbol or a double symbol, where the latter means that the DMRS is mapped in pairs of two adjacent symbols. Furthermore, the UE can be configured with one, two, three, or four single-symbol DMRSs and one or two double-symbol DMRSs.

[0032] Figure 3 Examples of Type 1 and Type 2 DMRSs with single-symbol DMRSs are shown. Type 1 and Type 2 differ in their mapping structure and the number of DMRS CDM groups they support, with Type 1 supporting 2 CDM groups and Type 2 supporting 3 CDM groups.

[0033] A DMRS antenna port is mapped to a resource element within only one CDM group. For a single-symbol DMRS, two antenna ports can be mapped to each CDM group.

[0034] 4. Phase tracking reference signal (PT-RS or PT-RS) for PUSCH in NR

[0035] In NR, the Phase Tracking Reference Signal (PT-RS) can be configured for PUSCH transmission so that the receiver can correct phase noise-related errors. PT-RS can be configured using the higher-level parameter PT-RS-UplinkConfig in DMRS-UplinkConfig for PUSCH scheduled for DCI format 0_1 ​​or DCI format 0_2.

[0036] In NR version 15, for CP-OFDM based waveforms, one or two PT-RS ports are supported for PUSCH. Each PT-RS port is associated with one of the DMRS ports used for PUSCH.

[0037] If more than one DMRS port is scheduled, i.e., multi-layer MIMO transmission of PUSCH, it is desirable from a performance perspective for PT-RS to be transmitted in the layer with the highest signal-to-interference-plus-noise ratio (SINR). This maximizes phase tracking performance. The network knows which layer has the optimal SINR based on measurements on the multi-port SRS. Therefore, when scheduling PUSCH from the UE, the network can instruct the UE on which layer to transmit PT-RS. This is communicated using PT-RS-DMRS association signaling, as defined in the table below.

[0038] The maximum number of PT-RS ports configured is given by the higher-level parameter maxNrofPorts in PT-RS-UplinkConfig based on the UE's reported requirements. If the UE has already reported support for fully coherent UL transmission, one PT-RS port is expected to be configured if necessary.

[0039] In the frequency domain, for CP-OFDM-based waveforms, the PT-RS can be located on at most one subcarrier within every two PRBs. Furthermore, the subcarrier used for the PT-RS port must also be one of the subcarriers used for the DMRS port associated with it. For DMRS configuration type 1, the DM-RS port is mapped to every other subcarrier. Therefore, the associated PT-RS can only be mapped to one of the six subcarriers in the PRB. An offset can be configured to determine which subcarrier the DM-RS is mapped to (see Table 6.4.1.2.2.1-1 in 3GPPTS 38.211v16.4.0).

[0040] In the time domain, the PT-RS can be configured with a time density of 1, 2, or 4, corresponding to the PT-RS in each PFDM symbol, every two OFDM symbols, or every four OFDM symbols in the time slot, respectively. The modulation symbols used for the PT-RS are the same as the associated DM-RS at the same subcarrier.

[0041] exist Figure 4 The image shows an example of PT-RS for a CP-OFDM-based waveform, where the PT-RS port is associated with DM-RS port 0, has a subcarrier offset of 4, and a time density of 2.

[0042] For UL transmissions based on or not based on codebooks, the association between (multiple) UL PT-RS ports and (multiple) DM-RS ports is signaled by the “PTRS-DMRS association” field in DCI format 0_1 ​​and DCI format 0_2.

[0043] If the UE is configured with a PT-RS port, the DM-RS port associated with the PT-RS port is indicated by the DCI parameter “PTRS-DMRS association” in DCI format 0_1 ​​and DCI format 0_2 in Table 7.3.1.1.2-25 of 3gpp TS38.212, which is copied below. As discussed above, the purpose is to schedule the PT-RS to be transmitted on the strongest layer / DMRS port (since there is one DMRS port per layer).

[0044] Table 7.3.1.1.2-25: PTRS-DMRS Association for UL PTRS Port 0

[0045] value DMRS port 0 The first scheduled DMRS port 1 The second scheduled DMRS port 2 The third scheduled DMRS port 3 The fourth scheduled DMRS port

[0046] For non-codebook-based UL transmissions, the actual number of PT-RS ports to be transmitted is determined based on the (multiple) SRIs in DCI format 0_1 ​​and DCI format 0_2. The UE configures the PT-RS port index for each configured SRS resource through the higher-layer parameter ptrs-PortIndex configured in SRS-Config. If the PT-RS port index associated with different SRIs is the same, the corresponding UL DM-RS port is associated with the same PT-RS port.

[0047] For UL transmissions based on partially coherent and incoherent codebooks, the actual number of UL PT-RS ports is determined based on the TPMI and / or the number of layers, indicated by the "Precoding information and number of layers" field in DCI format 0_1 ​​and DCI format 0_2. If the UE is configured with two PT-RS ports, the actual number of PT-RS ports and the associated transport layers(s) are derived from the indicated TPMI as follows:

[0048] • PUSCH antenna ports 1000 and 1002 in the indicated TPMI share PT-RS port 0, and PUSCH antenna ports 1001 and 1003 in the indicated TPMI share PT-RS port 1.

[0049] • PT-RS port 0 is associated with DM-RS ports, which are transmitted in the indicated TPMI along with PUSCH antenna ports 1000 and 1002. PT-RS port 1 is associated with another DM-RS port, which is transmitted in the indicated TPMI along with PUSCH antenna ports 1001 and 1003. The two DM-RS ports are given by the DCI parameter 'PTRS-DMRS association' in DCI format 0_1 ​​and DCI format 0_2 in Table 7.3.1.1.2-26 of 3gpp TS38.212, which is copied below.

[0050] Table 7.3.1.1.2-26: PTRS-DMRS Association for UL PT-RS Ports 0 and 1

[0051]

[0052] 5NR version 17 enhancements for PUSCH transmissions toward two TRPs

[0053] In NR Release 17, support for PUSCH repetition for two Transmit and Receive Points (TRPs) has been agreed upon. To this end, two SRS resource sets will be introduced, configured for use on a "codebook" or "non-codebook" basis, with each SRS resource set associated with one TRP. PUSCH repetition for two TRPs can be scheduled by a DCI with two SRS Resource Indicator (SRI) fields, where the first SRI field is associated with the first SRS resource set and the second SRI field is associated with the second SRS resource set.

[0054] Figure 5 An example is shown where the PUSCH repeats toward the two TRPs by the DCI, which indicates the two SRI fields.

[0055] To support PT-RS to DM-RS association for each TRP, an agreement was reached at the 3GPP RAN1#104e meeting to reuse the same 2 bits in the “PTRS-DMRS association” field in DCI format 0_1 ​​and DCI format 0_2, with one bit corresponding to each TRP.

[0056] "protocol

[0057] For the M-TRP PUSCH type B repetition scheme based on a single DCI, for maxRank=2, the number of bits used for the indication of PTRS-DMRS association is the same as in Rel-15 / 16, and MSB and LSB indicate the association between the PTRS port and DMRS port of the two TRPs, respectively.

[0058] • FFS: An indicator for PTRS-DMRS association for cases where maxRank > 2.

[0059] 6PT-RS power boost

[0060] The factor associated with the PUSCH to PT-RS power ratio per RE per layer is indicated to the UE via the power boost factor ptrs-Power in the PTRS-UplinkConfig IE configured in the higher layer.

[0061] The UL PTRS power enhancement factor per PTRS port is defined in Table 6.2.3.1-3 of 3GPP TS 38.214v16.4.0, which is reproduced below:

[0062] Table 6.2.3.1-3: Factors related to the PUSCH and PT-RS power ratio per RE per layer

[0063]

[0064] Summary of the Invention

[0065] Systems and methods relating to phase tracking reference signals (PT-RS) for transmission over a physical uplink shared channel (PUSCH) to multiple transmit / receive points (TRPs) are disclosed. In one embodiment, the method, performed by a wireless communication device, includes receiving downlink control information (DCI) from a base station, wherein the DCI schedules PUSCH repetition to two TRPs, and the PUSCH is configured by the base station with a maximum rank greater than 2. The DCI includes: an antenna port field indicating two or more demodulation reference signal (DMRS) ports; and one of the following: a single PTRS-DMRS (PTRS-DMRS) association field, the PTRS-DMRS association field being a 2-bit field; or two PTRS-DMRS association fields, including a first PTRS-DMRS field and a second PTRS-DMRS field, each PTRS-DMRS field having 2 bits. The method further includes determining, based on the value of the most significant bit (MSB) of a single PTRS-DMRS association field included in the DCI or a first PTRS-DMRS association field, at least one DMRS port associated with at least one PTRS port is used for PUSCH transmission to a first TRP; and determining, based on the value of the least significant bit (LSB) of a single PTRS-DMRS association field included in the DCI or a second PTRS-DMRS association field, at least one DMRS port associated with at least one PTRS port is used for PUSCH transmission to a second TRP.The method further includes sending a first PUSCH repeat to a first TRP using at least one PTRS port for PUSCH transmission to a first TPR, and sending a second PUSCH repeat to a second TRP using at least one PTRS port for PUSCH transmission to a first TPR, wherein one of the following is true: the MSB of a single PTRS-DMRS association field or the first PTRS-DMRS association field is associated with the first TRP, and the LSB of a single PTRS-DMRS association field or the second PTRS-DMRS association field is associated with the second TRP, wherein the first TRP is associated with a first Sounding Reference Signal (SRS) Resource Indicator (SRI) field in the DCI, and the second TRP is associated with a second SRI field in the DCI; or the MSB of a single PTRS-DMRS association field or the first PTRS-DMRS association field is associated with the second TRP. A first SRS resource set is associated with a first TRP, and the LSB of a single PTRS-DMRS association field or a second PTRS-DMRS association field is associated with a second SRS resource set, which is associated with a second TRP. The first SRS resource set is associated with a first SRI field in the DCI, and the second SRS resource set is associated with a second SRI field in the DCI. Alternatively, the MSB of a single PTRS-DMRS association field or a first PTRS-DMRS association field is associated with a first transmit precoding matrix indicator (TPMI) field in the DCI, the first TPMI field is associated with a first TRP, and the LSB of a single PTRS-DMRS association field or a second PTRS-DMRS association field is associated with a second TPMI field in the DCI, which is associated with a second TRP.

[0066] In one embodiment, the DCI includes a single PTRS-DMRS associated field; the MSB of the single PTRS-DMRS associated field is associated with a first TRP; and the LSB of the single PTRS-DMRS associated field is associated with a second TRP; wherein the first TRP is associated with a first SRI field in the DCI and the second TRP is associated with a second SRI field in the DCI.

[0067] In one embodiment, the DCI includes two PTRS-DMRS association fields: a first PTRS-DMRS association field and a second PTRS-DMRS field, each PTRS-DMRS field having 2 bits. The first PTRS-DMRS association field is associated with a first TRP; and the second PTRS-DMRS association field is associated with a second TRP; wherein the first TRP is associated with a first SRI field in the DCI and the second TRP is associated with a second SRI field in the DCI.

[0068] In one embodiment, the DCI includes a single PTRS-DMRS association field; the MSB of the single PTRS-DMRS association field is associated with a first SRS resource set, which is associated with a first TRP; and the LSB of the single PTRS-DMRS association field is associated with a second SRS resource set, which is associated with a second TRP; wherein the first SRS resource set is associated with a first SRI field in the DCI, and the second SRS resource set is associated with a second SRI field in the DCI.

[0069] In one embodiment, the DCI includes two PTRS-DMRS association fields: a first PTRS-DMRS field and a second PTRS-DMRS field, each PTRS-DMRS field having 2 bits. The first PTRS-DMRS association field is associated with a first SRS resource set, which is associated with a first TRP; and the second PTRS-DMRS association field is associated with a second SRS resource set, which is associated with a second TRP; wherein the first SRS resource set is associated with a first SRI field in the DCI, and the second SRS resource set is associated with a second SRI field in the DCI.

[0070] In one embodiment, the DCI includes a single PTRS-DMRS association field; the DCI is used for non-codebook-based PUSCH transmission and also includes a first SRI field and a second SRI field; the MSB of the single PTRS-DMRS association field is associated with the first SRI field; and the LSB of the single PTRS-DMRS association field is associated with the second SRI field.

[0071] In one embodiment, the DCI includes two PTRS-DMRS association fields, namely a first PTRS-DMRS field and a second PTRS-DMRS field, each field having 2 bits. The DCI is used for non-codebook-based PUSCH transmission and also includes a first SRI field and a second SRI field; the first PTRS-DMRS association field is associated with the first SRI field; and the second PTRS-DMRS association field is associated with the second SRI field.

[0072] In one embodiment, if the MSB value is 0 and a single PT-RS port 0 is configured, then the PT-RS port 0 used for the first TRP is associated with the first DMRS port indicated in the antenna port field of the DCI. If the MSB value is 1 and a single PT-RS port 0 is configured, then the PT-RS port 0 used for the first TRP is associated with the second DMRS port indicated in the antenna port field of the DCI.

[0073] In one embodiment, if the LSB value is 0 and a single PT-RS port 0 is configured, then the PT-RS port 0 used for the second TRP is associated with the first DMRS port indicated in the antenna port field of the DCI. If the LSB value is 1 and a single PT-RS port 0 is configured, then the PT-RS port 0 used for the second TRP is associated with the second DMRS port indicated in the antenna port field of the DCI.

[0074] In one embodiment, the DCI includes a single PTRS-DMRS associated field; the MSB of the single PTRS-DMRS associated field is associated with a first TPMI field of the DCI associated with a first TRP; and the LSB of the single PTRS-DMRS associated field is associated with a second TPMI field of the DCI associated with a second TRP.

[0075] In one embodiment, the DCI includes two PTRS-DMRS association fields: a first PTRS-DMRS field and a second PTRS-DMRS field, each PTRS-DMRS field having 2 bits. The first PTRS-DMRS association field is associated with a first TPMI field of the DCI associated with a first TRP; and the second PTRS-DMRS association field is associated with a second TPMI field of the DCI associated with a second TRP.

[0076] In one embodiment, the DCI includes a single PTRS-DMRS association field; the DCI is used for codebook-based PUSCH transmission and also includes a first TPMI field and a second TPMI field; the MSB of the single PTRS-DMRS association field is associated with the first TPMI field; and the LSB of the single PTRS-DMRS association field is associated with the second TPMI field.

[0077] In one embodiment, the DDCI includes two PTRS-DMRS association fields, namely a first PTRS-DMRS field and a second PTRS-DMRS field, each PTRS-DMRS field having 2 bits. The DCI is used for codebook-based PUSCH transmission and also includes a first TPMI field and a second TPMI field; the first PTRS-DMRS association field is associated with the first TPMI field; and the second PTRS-DMRS association field is associated with the second TPMI field.

[0078] In one embodiment, if the MSB value is 0 and a single PT-RS port 0 is configured, then the PT-RS port 0 used for the first TRP is associated with the first DMRS port indicated in the antenna port field of the DCI. If the MSB value is 1 and a single PT-RS port 0 is configured, then the PT-RS port 0 used for the first TRP is associated with the second DMRS port indicated in the antenna port field of the DCI.

[0079] In one embodiment, if the LSB value is 0 and a single PT-RS port 0 is configured, then the PT-RS port 0 used for the second TRP is associated with the first DMRS port indicated in the antenna port field of the DCI. If the LSB value is 1 and a single PT-RS port 0 is configured, then the PT-RS port 0 used for the second TRP is associated with the second DMRS port indicated in the antenna port field of the DCI.

[0080] In one embodiment, at least one DMRS port associated with at least one PTRS port is determined to be used for transmitting an MSB or a first PTRS-DMRS association field, based on a single PTRS-DMRS association field included in the DCI, to the PUSCH of a first TRP. A first DMRS port associated with the first PTRS port is determined to be used for PUSCH transmission to the first TRP. At least one DMRS port associated with at least one PTRS port is determined to be used for transmitting an LSB or a second PTRS-DMRS association field, based on a single PTRS-DMRS association field included in the DCI, to the PUSCH of a second TRP. A second DMRS port associated with the second PTRS port is determined to be used for PUSCH transmission to the second TRP. Sending a first PUSCH duplicate to the first TRP includes sending a first PUSCH duplicate to the first TRP using the first PTRS port associated with the first DMRS port, and sending a second PUSCH duplicate to the second TRP includes sending a second PUSCH duplicate to the second TRP using the second PTRS port associated with the second DMRS port.

[0081] In one embodiment, rank 3 or rank 4 is indicated in the DCI; the MSB of a single PTRS-DMRS association field indicates that one of the first DMRS port and the third DMRS port indicated in the antenna port field is associated with a first PTRS port used for PUSCH transmission to a first TRP; and the LSB of a single PTRS-DMRS association field indicates that one of the first DMRS port and the third DMRS port indicated in the antenna port field is associated with a second PTRS port used for PUSCH transmission to a second TRP.

[0082] In one embodiment, the first PTRS-DMRS association field indicates that one of the up to four DMRS ports indicated in the antenna port field is associated with the first PTRS port used for transmission to the PUSCH of the first TRP; and the second PTRS-DMRS association field indicates that one of the up to four DMRS ports indicated in the antenna port field is associated with the first PTRS port used for transmission to the PUSCH of the second TRP.

[0083] In one embodiment, the wireless communication device is configured with two PTRS ports for each TRP, and determining that at least one DMRS port associated with at least one PTRS port is used for PUSCH transmission to the first TRP includes: determining that a first DMRS port associated with the first PTRS port is used for PUSCH transmission to the first TRP based on the MSB value of a single PTRS-DMRS association field included in the DCI or a first PTRS-DMRS association field; and determining that a second DMRS port associated with a second PTRS port is used for PUSCH transmission to the first TRP based on the MSB value of a single PTRS-DMRS association field included in the DCI or the LSB of the first PTRS-DMRS association field. Determining that at least one DMRS port associated with at least one PTRS port is used for PUSCH transmission to the second TRP includes: determining that a third DMRS port associated with a third PTRS port is used for PUSCH transmission to the second TRP based on the LSB value of a single PTRS-DMRS association field included in the DCI or the MSB value of a second PTRS-DMRS association field; and determining that a fourth DMRS port associated with a fourth PTRS port is used for PUSCH transmission to the second TRP based on the LSB value of a single PTRS-DMRS association field included in the DCI or the second PTRS-DMRS association field. Sending a first PUSCH duplicate to the first TRP includes sending a first PUSCH duplicate to the first TRP using the first PTRS port associated with the first DMRS port and the second PTRS port associated with the second DMRS port; and sending a second PUSCH duplicate to the second TRP includes sending a second PUSCH duplicate to the second TRP using the third PTRS port associated with the third DMRS port and the fourth PTRS port associated with the fourth DMRS port.

[0084] In one embodiment, the DCI includes a single PTRS-DMRS association field; the MSB of the single PTRS-DMRS association field indicates: a first DMRS port associated with a first PTRS port from a first DMRS port group; and a second DMRS port associated with a second PTRS port from a second DMRS port group; and the LSB of the single PTRS-DMRS association field indicates: a third DMRS port associated with a third PTRS port from the first DMRS port group; and a fourth DMRS port associated with a fourth PTRS port from the second DMRS port group.

[0085] In one embodiment, the DCI includes two PTRS-DMRS association fields: a first PTRS-DMRS field and a second PTRS-DMRS field, each PTRS-DMRS field having 2 bits. The MSB of the first PTRS-DMRS association field indicates: the first DMRS port associated with the first PTRS port in the first DMRS port group; the LSB of the first PTRS-DMRS association field indicates: the second DMRS port associated with the second PTRS port in the second DMRS port group; the MSB of the second PTRS-DMRS association field indicates: the third DMRS port associated with the third PTRS port in the first DMRS port group; and the LSB of the second PTRS-DMRS association field indicates: the fourth DMRS port associated with the fourth PTRS port in the second DMRS port group.

[0086] In one embodiment, the first DMRS port is associated with the first PUSCH or the SRS port group of shared PT-RS port 0, and the second DMRS port is associated with the second PUSCH or the SRS port group of shared PT-RS port 1.

[0087] A corresponding embodiment of a wireless communication device is also disclosed. In one embodiment, the wireless communication device is adapted to receive a DCI from a base station, wherein the DCI schedules PUSCH repetition to two TRPs, and the PUSCH is configured by the base station with a maximum rank greater than 2. The DCI includes: an antenna port field indicating two or more DMRS ports; and one of the following: a single PTRS-DMRS association field, the PTRS-DMRS association field being a 2-bit field; or two PTRS-DMRS association fields, including a first PTRS-DMRS field and a second PTRS-DMRS field, each PTRS-DMRS field having 2 bits. The wireless communication device is also adapted to determine, based on the MSB value of the single PTRS-DMRS association field included in the DCI or the first PTRS-DMRS association field, at least one DMRS port associated with at least one PTRS port for PUSCH transmission to a first TRP, and based on the LSB value of the single PTRS-DMRS association field included in the DCI or the second PTRS-DMRS association field, at least one DMRS port associated with at least one PTRS port for PUSCH transmission to a second TRP.The wireless communication device is also adapted to send a first PUSCH repeat to a first TRP using at least one PTRS port for PUSCH transmission to a first TPR, and to send a second PUSCH repeat to a second TRP using at least one PTRS port for PUSCH transmission to a first TPR, wherein one of the following is true: the MSB of a single PTRS-DMRS association field or the first PTRS-DMRS association field is associated with the first TRP, and the LSB of a single PTRS-DMRS association field or the second PTRS-DMRS association field is associated with the second TRP, wherein the first TRP is associated with a first SRI field in the DCI, and the second TRP is associated with a second SRI field in the DCI; or the MSB of a single PTRS-DMRS association field or the first PTRS-DMRS association field is associated with the first TRP. SRS resource sets are associated, the first SRS resource set is associated with the first TRP, and the LSB of a single PTRS-DMRS associated field or the second PTRS-DMRS associated field is associated with the second SRS resource set, the second SRS resource set is associated with the second TRP, wherein the first SRS resource set is associated with the first SRI field in the DCI, and the second SRS resource set is associated with the second SRI field in the DCI; or the MSB of a single PTRS-DMRS associated field or the first PTRS-DMRS associated field is associated with the first TPMI field of the DCI, the first TPMI field is associated with the first TRP, and the LSB of a single PTRS-DMRS associated field or the second PTRS-DMRS associated field is associated with the second TPMI field of the DCI, the second TPMI field is associated with the second TRP.

[0088] In another embodiment, the method performed by the wireless communication device includes receiving a DCI from a base station, wherein: the DCI schedules PUSCH repetition to two TRPs; and the DCI includes: an antenna port field indicating two or more DMRS ports; and a PTRS-DMRS association field, the PTRS-DMRS association field being a 2-bit field. The method further includes determining, based on the MSB value of the PTRS-DMRS association field included in the DCI, at least one DMRS port associated with at least one PTRS port is used for PUSCH transmission to a first TRP, and determining, based on the LSB value of the PTRS-DMRS association field included in the DCI, at least one DMRS port associated with at least one PTRS port is used for PUSCH transmission to a second TRP. The method further includes sending a first PUSCH duplicate to a first TRP using at least one PTRS port used for PUSCH transmission to a first TPR, and sending a second PUSCH duplicate to a second TRP using at least one PTRS port used for PUSCH transmission to a first TPR, wherein one of the following is true: the MSB of the PTRS-DMRS association field is associated with the first TRP, and the LSB of the PTRS-DMRS association field is associated with the second TRP, wherein the first TRP is associated with a first SRI field in the DCI, and the second TRP is associated with a second SRI field in the DCI; or the MSB of the PTRS-DMRS association field is associated with a first SRI field in the DCI. The S resource set is associated with the first SRS resource set and the first TRP, and the LSB of the PTRS-DMRS association field is associated with the second SRS resource set and the second SRS resource set is associated with the second TRP, wherein the first SRS resource set is associated with the first SRI field in the DCI, and the second SRS resource set is associated with the second SRI field in the DCI; or the MSB of the PTRS-DMRS association field is associated with the first TPMI field of the DCI, the first TPMI field is associated with the first TRP, and the LSB of the PTRS-DMRS association field is associated with the second TPMI field of the DCI, and the second TPMI field is associated with the second TRP.

[0089] In another embodiment, the method performed by the wireless communication device includes receiving a DCI from a base station, wherein the DCI schedules PUSCH repetition to two TRPs; and the DCI includes: an antenna port field indicating two or more DMRS ports; and a first PTRS-DMRS association field and a second PTRS-DMRS association field, each PTRS-DMRS association field being a 2-bit field. The method further includes determining, based on the value of at least one PTRS-DMRS association field included in the DCI, that at least one DMRS port associated with at least one PTRS port is used for PUSCH transmission to the first TRP, and determining, based on the value of at least one PTRS-DMRS association field included in the DCI, that at least one DMRS port associated with at least one PTRS port is used for PUSCH transmission to the second TRP. The method further includes sending a first PUSCH duplicate to a first TRP using at least one PTRS port for PUSCH transmission to a first TPR, and sending a second PUSCH duplicate to a second TRP using at least one PTRS port for PUSCH transmission to a second TPR, wherein one of the following is true: the maximum rank is 4, the first PTRS-DMRS association field is associated with a first SRS resource set, the first SRS resource set is associated with a first TRP, and the second PTRS-DMRS association field is associated with a second SRS resource set, the second SRS resource set is associated with a second TRP; or the first PTRS-DMRS association field is associated with a first TPMI field in the DCI. The association is as follows: the first TPMI field is associated with the first TRP, and the second PTRS-DMRS association field is associated with the second TPMI field in the DCI, and the second TPMI field is associated with the second TRP; or each TRP is configured with two PT-RS ports, with a maximum rank of 4, the first PTRS-DMRS association field is associated with the first SRS resource set, the second PTRS-DMRS association field is associated with the second SRS resource set, the first SRS resource set is associated with the first SRI field in the DCI, the first SRI field is associated with the first TRP, and the second SRS resource set is associated with the second SRI field in the DCI, and the second SRI field is associated with the second TRP.

[0090] Embodiments of a wireless communication device are also disclosed. In one embodiment, the wireless communication device is adapted to receive a DCI from a base station, wherein the DCI schedules PUSCH repetition to two TRPs, and the DCI includes: an antenna port field indicating two or more demodulation reference signal DMRS ports; and a first PTRS-DMRS association field and a second PTRS-DMRS association field, each PTRS-DMRS association field being a 2-bit field. The wireless communication device is also adapted to determine, based on the value of at least one PTRS-DMRS association field included in the DCI, at least one DMRS port associated with at least one PTRS port for PUSCH transmission to a first TRP, and based on the value of at least one PTRS-DMRS association field included in the DCI, at least one DMRS port associated with at least one PTRS port for PUSCH transmission to a second TRP. The wireless communication device is also adapted to send a first PUSCH repeat to a first TRP using at least one PTRS port for PUSCH transmission to a first TPR, and to send a second PUSCH repeat to a second TRP using at least one PTRS port for PUSCH transmission to a second TPR, wherein one of the following is true: the maximum rank is 4, the first PTRS-DMRS association field is associated with a first SRS resource set, the first SRS resource set is associated with a first TRP, and the second PTRS-DMRS association field is associated with a second SRS resource set, the second SRS resource set is associated with a second TRP; or the first PTRS-DMRS association field is associated with a first TPMI word in the DCI. The segments are associated as follows: the first TPMI field is associated with the first TRP, and the second PTRS-DMRS association field is associated with the second TPMI field in the DCI, and the second TPMI field is associated with the second TRP; or each TRP is configured with two PT-RS ports, with a maximum rank of 4, the first PTRS-DMRS association field is associated with the first SRS resource set, the second PTRS-DMRS association field is associated with the second SRS resource set, the first SRS resource set is associated with the first SRI field in the DCI, the first SRI field is associated with the first TRP, and the second SRS resource set is associated with the second SRI field in the DCI, and the second SRI field is associated with the second TRP.

[0091] Embodiments of a method performed by a base station are also disclosed. In one embodiment, the method performed by the base station includes sending a DCI to a wireless communication device, wherein: the DCI schedules PUSCH repetition to two TRPs, and the DCI includes: an antenna port field indicating two or more DMRS ports; and a PTRS-DMRS association field, the PTRS-DMRS association field being a 2-bit field; wherein one of the following is true: the MSB of the PTRS-DMRS association field is associated with a first TRP, and the LSB of the PTRS-DMRS association field is associated with a second TRP, wherein the first TRP is associated with a first SRI field in the DCI, and the second TRP is associated with a second SRI field in the DCI; or the PTRS-DMRS association field is... The MSB is associated with the first SRS resource set, which is associated with the first TRP, and the LSB of the PTRS-DMRS association field is associated with the second SRS resource set, which is associated with the second TRP, wherein the first SRS resource set is associated with the first SRI field in the DCI, and the second SRS resource set is associated with the second SRI field in the DCI; or the MSB of the PTRS-DMRS association field is associated with the first TPMI field of the DCI, which is associated with the first TRP, and the LSB of the PTRS-DMRS association field is associated with the second TPMI field of the DCI, which is associated with the second TRP.

[0092] In another embodiment, the method performed by the base station includes receiving a DCI from a wireless communication device, wherein: the DCI schedules PUSCH repetitions to two TRPs; and the DCI includes: an antenna port field indicating two or more DMRS ports; and a first PTRS-DMRS association field and a second PTRS-DMRS association field, each PTRS-DMRS association field being a 2-bit field, wherein one of the following is true: the maximum rank is 4; the first PTRS-DMRS association field is associated with a first SRS resource set, the first SRS resource set is associated with a first TRP; and the second PTRS-DMRS association field is associated with a second SRS resource set, the second SRS resource set is associated with a second TRP; or the first PTRS-DMRS... The associated field is associated with the first TPMI field in the DCI, the first TPMI field is associated with the first TRP, and the second PTRS-DMRS associated field is associated with the second TPMI field in the DCI, and the second TPMI field is associated with the second TRP; or each TRP is configured with two PT-RS ports, with a maximum rank of 4, the first PTRS-DMRS associated field is associated with the first SRS resource set, the second PTRS-DMRS associated field is associated with the second SRS resource set, the first SRS resource set is associated with the first SRI field in the DCI, the first SRI field is associated with the first TRP, and the second SRS resource set is associated with the second SRI field in the DCI, and the second SRI field is associated with the second TRP.

[0093] The corresponding implementation of the base station was also disclosed. Attached Figure Description

[0094] The accompanying drawings, which are incorporated in and form part of this specification, illustrate several aspects of this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0095] Figure 1 The time-domain architecture of the 3GPP New Radio (NR) with a subcarrier spacing of 15 kHz is shown.

[0096] Figure 2 The basic NR physical time-frequency resource grid is shown;

[0097] Figure 3 Examples of Type 1 and Type 2 demodulation reference signals (DMRS) with single-symbol DMRS are shown;

[0098] Figure 4 An example phase tracking reference signal for a waveform used in cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) is shown;

[0099] Figure 5An example of physical uplink shared channel (PUSCH) repetition toward two transmit / receive points (TRPs) is shown, which is scheduled by downlink control information (DCI) indicating two probe reference signal (SRS) resource indicator (SRI) fields.

[0100] Figure 6 An example of a cellular communication system that can implement embodiments of the present disclosure is shown;

[0101] Figure 7A and Figure 7B An example of PUSCH repetition toward two TRPs (denoted as TRP#1 and TRP#2) is shown, where the PUSCH consists of two layers, each associated with one of DMRS ports 0 and 1;

[0102] Figure 8 An example of the association of SRS ports, DMRS ports, and PT-RS ports according to embodiments of the present disclosure is shown;

[0103] Figure 9 An example is shown of associating a DMRS port with a PT-RS port when each TRP is configured with two PT-RS, according to an embodiment of the present disclosure;

[0104] Figure 10 An example is shown of determining the DMRS port-to-PTRS port association for the PUSCH of the first TRP in rank 3 according to an embodiment of the present disclosure.

[0105] Figure 11A and Figure 11B Operation of a user equipment (UE) and an NR base station (gNB) including two TRPs (TRP 1 and TRP 2) according to some embodiments of the present disclosure is illustrated.

[0106] Figure 12A and Figure 12B Operation of a UE and a gNB including two TRPs (TRP 1 and TRP 2) according to some other embodiments of this disclosure is illustrated;

[0107] Figure 13 , Figure 14 and Figure 15 This is a schematic block diagram of an example embodiment of a network node;

[0108] Figure 16 and Figure 17 This is a schematic block diagram of an example embodiment of a wireless device;

[0109] Figure 18 Example embodiments of a communication system that can implement the embodiments of this disclosure are shown;

[0110] Figure 19 It shows Figure 18 Example embodiments of the host computer, base station, and UE; and

[0111] Figure 20 , Figure 21 , Figure 22 and Figure 23 It is shown in such as Figure 18 A flowchart of an example embodiment of a method implemented in a communication system. Detailed Implementation

[0112] The embodiments described below illustrate information that enables those skilled in the art to practice the embodiments and demonstrate the best mode for practicing the embodiments. Upon reading the following description in conjunction with the accompanying drawings, those skilled in the art will understand the concepts of this disclosure and recognize the application of these concepts not specifically addressed herein. It should be understood that these concepts and applications fall within the scope of this disclosure.

[0113] Some embodiments contemplated herein will now be described more fully with reference to the accompanying drawings. However, other embodiments are included within the scope of the subject matter disclosed herein, and the disclosed subject matter should not be construed as being limited to the embodiments described herein; rather, these embodiments are provided by way of example to convey the scope of the subject matter to those skilled in the art.

[0114] Generally, all terms used herein should be interpreted according to their ordinary meaning in the relevant art, unless a different meaning is expressly given and / or implied from the context of their use. All references to "a / an / element, device, component, part, step, etc." should be explicitly interpreted as referring to at least one instance of that element, device, component, part, step, etc., unless otherwise expressly stated. The steps of any method disclosed herein need not be performed in the exact order disclosed, unless a step is explicitly described as occurring after or before another step, and / or where it is implied that one step must occur after or before another step. Any feature of any embodiment disclosed herein may be applied to any other embodiment, where appropriate. Similarly, any advantage of any embodiment may be applied to any other embodiment, and vice versa. Further objects, features, and advantages of the appended embodiments will be apparent from the following description.

[0115] Radio node: As used in this article, a “radio node” is a radio access node or wireless communication device.

[0116] Radio Access Node: As used herein, a “radio access node,” “radio network node,” or “radio access network node” is any node in the radio access network (RAN) of a cellular communication network that operates to wirelessly transmit and / or receive signals. Some examples of radio access nodes include, but are not limited to, base stations (e.g., NR base stations (gNBs) in 3GPP 5G New Radio (NR) networks or enhanced or evolved Node Bs (eNBs) in 3GPP Long Term Evolution (LTE) networks), high-power or macro base stations, low-power base stations (e.g., micro base stations, pico base stations, home eNBs, etc.), relay nodes, network nodes that implement some of the functions of a base station (e.g., network nodes that implement a gNB central unit (gNB-CU) or a gNB distributed unit (gNB-DU), or network nodes that implement some of the functions of another type of radio access node.

[0117] Core Network Node: As used herein, a “core network node” is any type of node in the core network or any node that implements core network functions. Some examples of core network nodes include, for example, a Mobility Management Entity (MME), a Packet Data Network Gateway (P-GW), a Service Capability Opening Function (SCEF), a Home Subscriber Server (HSS), etc. Some other examples of core network nodes include nodes that implement the following: Access and Mobility Management Function (AMF), User Plane Function (UPF), Session Management Function (SMF), Authentication Server Function (AUSF), Network Slice Selection Function (NSSF), Network Opening Function (NEF), Network Function (NF) Repository Function (NRF), Policy Control Function (PCF), Unified Data Management (UDM), etc.

[0118] Communication equipment: As used herein, “communication equipment” is any type of device capable of accessing an access network. Some examples of communication equipment include, but are not limited to: mobile phones, smartphones, sensor devices, instruments, vehicles, home appliances, medical appliances, media players, cameras, or any type of consumer electronic device, such as, but not limited to, televisions, radios, lighting fixtures, tablets, laptops, or personal computers (PCs). Communication equipment can be portable, handheld, computer-integrated, or in-vehicle mobile devices capable of transmitting voice and / or data via wireless or wired connections.

[0119] Wireless communication device: One type of communication device is a wireless communication device, which can be any type of wireless device capable of accessing (i.e., served by) a wireless network (e.g., a cellular network). Some examples of wireless communication devices include, but are not limited to: User Equipment (UE) devices, Machine-Type Communication (MTC) devices, and Internet of Things (IoT) devices in 3GPP networks. Such wireless communication devices can be, or can be integrated into, mobile phones, smartphones, sensor devices, instruments, vehicles, home appliances, medical appliances, media players, cameras, or any type of consumer electronic device, such as, but not limited to, televisions, radios, lighting fixtures, tablets, laptops, or PCs. Wireless communication devices can be portable, handheld, computer-integrated, or in-vehicle mobile devices capable of transmitting voice and / or data via a wireless connection.

[0120] Network node: As used in this document, a “network node” is any node that is part of the RAN or core network of a cellular communication network / system.

[0121] Transmit / Receive Point (TRP): In some embodiments, a TRP can be any of a network node, radio head, spatial relation, or Transmission Configuration Indicator (TCI) state. In some embodiments, a TRP can be represented by an SRS resource set, an SRI field or TPMI field in a DCI, a spatial relation, or a TCI state. In some embodiments, a TRP can use multiple TCI states. In some embodiments, a TRP can be part of a gNB that transmits / receives radio signals to / from the UE based on the physical layer attributes and parameters inherent to that element. In some embodiments, in multi-TRP operation, the serving cell can schedule the UE from two TRPs, thereby providing better Physical Downlink Shared Channel (PDSCH) coverage, reliability, and / or data rate. Multi-TRP has two different operating modes: single downlink control information (DCI) and multiple DCI. For both modes, uplink and downlink operation control is performed by the physical layer and medium access control (MAC). In single DCI mode, the UE is scheduled by the same DCI from both TRPs, while in multi-DCI mode, the UE is scheduled by independent DCIs from each TRP.

[0122] In some embodiments, a set of transmitting points (TPs) is a set of geographically co-located transmit antennas (e.g., an antenna array (with one or more antenna elements)) for a cell, a portion of a cell, or a location reference signal (PRS)-only TP. A TP may include base station (eNB) antennas, remote radio heads (RRHs), remote antennas of a base station, antennas of a PRS-only TP, etc. A cell may be formed by one or more TPs. For homogeneous deployments, each TP may correspond to one cell.

[0123] In some embodiments, a group of TRPs is a group of geographically co-located antennas (e.g., an antenna array (with one or more antenna elements)) that supports TP and / or receiver point (RP) functionality.

[0124] Note that the descriptions presented herein focus on 3GPP cellular communication systems; therefore, 3GPP terminology or similar terms are frequently used. However, the concepts disclosed herein are not limited to 3GPP systems.

[0125] Note that the term “cell” may be used in the description in this article; however, in particular with respect to the 5G NR concept, the term “beam” may be used instead of “cell”. Therefore, it is important to note that the concepts described in this article apply equally to cells and beams.

[0126] Several challenges exist. One issue is that when scheduling the Physical Uplink Shared Channel (PUSCH) using a repetitive TRP reception method, the layer with the strongest signal-to-interference-plus-noise ratio (SINR) will be different for all (two) TRPs. Therefore, even if an optimal layer is selected for transmissions toward the first TRP, it may not be the optimal layer for repeated transmissions toward the second TRP. Consequently, phase tracking performance will degrade, which in turn means reduced uplink throughput.

[0127] When support for PUSCH repetition toward two or more TRPs is introduced, the phase tracking reference signal (PT-RS) will encounter the following problems:

[0128] • 3GPP has not yet discussed how to support PT-RS to multiple TRPs in the case of PUSCH transmissions with a maximum rank > 2. Currently, the protocol for using one bit per TRP for the association indication of PT-RS with the demodulation reference signal (DM-RS) only applies to maximum rank = 2.

[0129] How to support receiving from 2 PT-RS ports per TRP?

[0130] How to associate / map the 2-bit "PTRS-DMRS association" field in the downlink control information (DCI) to two TRPs is also a valid open question for rank 2 and 3 transmissions.

[0131] • In the case of PUSCH transmissions for multiple TRPs, how does the UE report its PT-RS capability?

[0132] Certain aspects and embodiments thereof in this disclosure may provide solutions to the foregoing or other challenges. Systems and methods comprising one or more of the following aspects are disclosed herein:

[0133] 1. If a DCI is configured to indicate PUSCH repetition to both TRPs and one PT-RS port for each TRP,

[0134] a. The most significant bit (MSB) and least significant bit (LSB) of the “PTRS-DMRS association” field in the DCI are associated with the first and second Probe Reference Signal (SRS) Resource Indicator (SRI) fields in the DCI for non-codebook-based PUSCH transmission, and with the first and second Transport Precoding Matrix Indicator (TPMI) fields in the DCI for codebook-based PUSCH transmission. The first and second SRI or TPMI fields are associated with the first and second TRPs, respectively. If the SRI or TPMI field is absent, the PT-RS field is ignored.

[0135] b. In one embodiment, the above association applies to a maximum rank of 2 or 4, and the MSB and LSB indicate that one of the first DMRS port and the second DMRS port indicated in the “antenna ports” field in the DCI is associated with a PT-RS port used for PUSCH transmission to the first TRP and the second TRP, respectively.

[0136] c. In another embodiment, if rank 3 or 4 is indicated in the DCI, then the MSB and LSB indicate that one of the first DMRS port and the third DMRS port indicated in the “Antenna Port” field of the DCI is associated with a PT-RS port used for PUSCH transmission to the first TRP and the second TRP, respectively.

[0137] d. In yet another embodiment, the DCI may include two “PTRS-DMRS association” fields, each associated with a TRP.

[0138] 2. If the PUSCH of two TRPs is repeatedly scheduled by DCI and each TRP is configured with two PT-RS ports, i.e., PT-RS ports 0 and 1,

[0139] a. In one embodiment, the MSB of the “PTRS-DMRS Association” field in the DCI is associated with PT-RS port 0, and the LSB of the field is associated with PT-RS port 1. The same PT-RS and DM-RS association indication indicated by the “PTRS-DMRS Association” field in the DCI is applied to both TRPs.

[0140] b. In another embodiment, the “PTRS-DMRS association” field in the DCI is only for the first TRP. The PTRS-DMRS association for the second TRP is predetermined.

[0141] c. In yet another embodiment, the MSB and LSB of the “PTRS-DMRS association” field in the DCI are for a first TRP and a second TRP, respectively. For each TRP, a first DMRS port and a second DMRS port are selected from a first DMRS port group and a second DMRS port group, respectively, for PT-RS port 0 and PT-RS port 1, wherein the first DMRS port and the second DMRS port are associated with a first or second PUSCH or SRS port group, respectively. The selection is rank-dependent.

[0142] d. In one embodiment, both a and b can be supported, and the higher layer configures one of them to the UE.

[0143] 3. The PT-RS to PUSCH power ratio can be configured for each TRP.

[0144] In some embodiments, a single two-bit "PTRS-DMRS association" field in the DCI of repeatedly scheduling PUSCH to two TRPs is used to indicate one or two DMRS ports associated with one or two PTRS ports used for PUSCH transmission to each TRP. Using a single 2-bit "PTRS-DMRS association" field saves DCI overhead and can share the same field as conventional PUSCH transmission to a single TRP.

[0145] Since the PUSCH can be repeated up to 4 levels for each TRP, with each level associated with a DMRS port, it is a problem to determine how to use these two bits to indicate one or both of the 4 DMRS ports used for each of the two TRPs.

[0146] In one embodiment, the MSB and LSB of the "PTRS-DMRS Association" field are used for the first TRP and the second TRP, respectively. Even if the DCI may indicate 3 or 4 DMRS ports, only the first two DMRS ports can be selected for PT-RS port association. A drawback is that phase tracking performance will degrade if the strongest layer is associated with the third or fourth DMRS port.

[0147] In another embodiment, when configuration repeats, the DMRS-PTRS indication in the DCI is always associated with PUSCH transmissions to one of the two TRPs (e.g., the first TRP). For PUSCH repeats toward the second TRP, the default DMRS-PTRS indication specified in the standard is used. For example, the first DMRS port always shares the PTRS port. This means that, on average, PTRS transmissions toward the second TRP do not gain SINR, while PTRS transmissions toward the first TRP gain SINR.

[0148] In another embodiment, if two PT-RS ports are configured for PUSCH transmission and PUSCH to both TRPs is repeatedly scheduled, the DMRS ports {k1, k2, k3, k4} indicated in the DCI are divided into two DMRS port groups, namely, DMRS port group A and DMRS port group B. DMRS port group A is associated with an SRS port group consisting of SRS ports 1000 and 1002 from the SRS resources in a first (or second) SRS resource set, which is associated with a first (or second) SRI field in the DCI. DMRS port group B is associated with a port group consisting of SRS ports 1001 and 1003. The MSB and LSB of the “PTRS-DMRS association” field in the DCI are used for the first TRP and the second TRP, respectively.

[0149] If the DCI indicates rank 4, then DMRS port group A consists of DMRS ports {a1, a2} (ai∈{k1,k2,k3,k4}, i=1,2), and DMRS port group B consists of DMRS ports {b1, b2} (bi∈{k1,k2,k3,k4}, i=1,2). If the MSB (or LSB) of the “PTRS-DMRS Association” field is 0, then the first DMRS port and the second DMRS port associated with the first PT-RS port and the second PT-RS port are respectively determined as DMRS port a1 and DMRS port b1; or if the MSB (or LSB) of the “PTRS-DMRS Association” field is 1, then they are respectively determined as DMRS port a2 and DMRS port b2.

[0150] If the indicator is rank 3, then one DMRS port group will have one DMRS port, and another DMRS port group will have two DMRS ports. The MSB (or LSB) of the “PTRS-DMRS Association” field indicates one DMRS port in the DMRS port group, where two DMRS ports are used for the associated PT-RS port.

[0151] If the indicator is rank 2, and if the two associated DMRS ports are in the same DMRS port group, then a single PTRS port will be sent. The MSB (or LSB) of the “PTRS-DMRS Association” field indicates the DMRS ports in the DMRS port group where two DMRS ports are used for a single PT-RS port. Otherwise, if each DMRS port group contains one DMRS port, the “PTRS-DMRS Association” field can be omitted. The first DMRS port or the second DMRS port is the DMRS port in the first DMRS port group or the second DMRS port group, respectively.

[0152] In another embodiment, two two-bit “PTRS-DMRS association” fields may be included in the DCI, with each field used for one TRP.

[0153] In another embodiment, the first PT-RS and the second PT-RS are configured with the PUSCH energy per resource element (EPRE) ratio for the first TRP and the second TRP, respectively.

[0154] Certain embodiments may provide one or more of the following technical advantages. Embodiments of the solutions(s) described herein enable PUSCH repetition to be sent to each TRP using two PT-RS ports when the UE uses partially or incoherent antenna ports. Embodiments may allow PUSCH repetition to both TRPs with a rank > 2 for better ULUE throughput without increasing DCI overhead.

[0155] Figure 6 An example of a cellular communication system 600 in which embodiments of the present disclosure may be implemented is shown. In the embodiments described herein, the cellular communication system 600 is a 5G system (5GS) including a next-generation RAN (NG-RAN) and a 5G core (5GC); however, the present disclosure is not limited thereto. Embodiments of the present disclosure can be used in any type of wireless or cellular communication system requiring multiple TRP transmissions. In this example, the RAN includes base stations 602-1 and 602-2, which in the 5GS include NR base stations (gNB) and optional next-generation eNBs (ng-eNB), and base stations 602-1 and 602-2 control corresponding (macro)cells 604-1 and 604-2. Base stations 602-1 and 602-2 are generally referred to herein collectively as base station 602, and individually as base station 602. Similarly, (macro)cells 604-1 and 604-2 are generally referred to herein collectively as (macro)cell 604, and individually as (macro)cell 604. The RAN may also include multiple low-power nodes 606-1 to 606-4 that control the respective small cells 608-1 to 608-4. Low-power nodes 606-1 to 606-4 may be small base stations (such as pico or femto base stations) or RRHs, etc. It is worth noting that, although not shown, one or more of small cells 608-1 to 608-4 may alternatively be provided by base station 602. Low-power nodes 606-1 to 606-4 are generally referred to herein collectively as low-power node 606, and individually as low-power node 606. Similarly, small cells 608-1 to 608-4 are generally referred to herein collectively as small cell 608, and individually as small cell 608. The cellular communication system 600 also includes a core network 610, which is referred to as 6GC in 5GS. Base station 602 (and optionally low-power node 606) is connected to core network 610.

[0156] Base station 602 and low-power node 606 provide services to wireless communication devices 612-1 to 612-6 in corresponding cells 604 and 608. Wireless communication devices 612-1 to 612-6 are generally referred to herein collectively as wireless communication device 612, and individually as wireless communication device 612. In the following description, wireless communication device 612 is generally a UE, and is therefore sometimes referred to herein as UE 612, but this disclosure is not limited thereto.

[0157] A description of embodiments of this disclosure will now be provided.

[0158] 1. Instructions for UL PT-RS for multiple TRPs

[0159] Figure 7A and Figure 7B An example of PUSCH repetition towards two TRPs (denoted as TRP#1 and TRP#2) is shown, where the PUSCH consists of two layers, each associated with one of DM-RS ports 0 and 1. The same number of layers are sent to each TRP, and the same time and frequency resources are used in each timeslot. PUSCH repetition can be dynamically scheduled using DCI (e.g., DCI format 0_1 ​​or DCI format 0_2). For phase tracking purposes, PT-RS ports are also sent along with each PUSCH transmission in the example. Because the channels to the two TRPs can be different, the strongest layer for each TRP can also be different. In this example, the strongest layer to TRP#1 is the layer associated with DM-RS port 1, while the strongest layer to TRP#2 is the layer associated with DM-RS port 0. For optimal phase tracking performance, PT-RS ports should be associated with the strongest layer in each PUSCH repetition. Therefore, in this example, the PT-RS port is associated with DM-RS port 1 for PUSCH transmission to TRP#1, and with DM-RS port 0 for PUSCH transmission to TRP#2. Here, association means that the PT-RS port is located on one of the subcarriers to which the associated DM-RS port is assigned, and the PT-RS symbol in the subcarrier is the same as the associated DM-RS symbol in the same subcarrier.

[0160] In the embodiments described herein, the association between the PT-RS port and the DM-RS port for each TRP is indicated by the 2-bit PT-RS and DM-RS association bit field in the DCI of the corresponding PUSCH repetition.

[0161] Note that the term "TRP" may not appear directly in the 3GPP standard specification. Instead, it may be used as part of the standard as an SRS resource set, SRI field, TPMI field, spatial relation, or UL TCI status field, which are equivalent to indicating a TRP.

[0162] 1.1 Each TRP is configured by the higher layer to have one PT-RS port.

[0163] In some of the embodiments below, a single PTRS-DMRS associated field in the DCI is assumed.

[0164] When a higher layer configures a PT-RS port for PUSCH transmission, and if PUSCH to two TRPs is repeatedly scheduled by the DCI, in one embodiment, for a non-codebook-based PUSCH transmission configured with two SRS resource sets, where the purpose is set to "non-codebook," the most significant bit (MSB) of the "PTRS-DMRS association" field in the DCI is associated with the first TRP (or the first SRS resource set), and the least significant bit (LSB) is associated with the second TRP (or the second SRS resource set), wherein if the SRI field is present, the first TRP and the second TRP (or the first SRS resource set and the second SRS resource set) are associated with the first SRI field and the second SRI field in the DCI. If the SRI field is absent, the PT-RS field is ignored, as this implies a single-layer PUSCH transmission utilizing a single DMRS port. The PTRS port will be associated with the DMRS port, and there is no need to use the PTRS-DMRS association field for explicit indication of the association between PTRS and DMRS. An example is shown in Table 1, where the MSB is for the first TRP associated with the first SRS resource set, and the LSB is for the second TRP associated with the second SRS resource set.

[0165] Table 1: PTRS-DMRS association for ULPTRS ports with duplicate PUSCH configuration when two SRS resource sets are configured with "non-codebook" as their purpose.

[0166] For codebook-based PUSCH transmissions, the MSB and LSB of the "PTRS-DMRS Association" field in the DCI are associated with the first TRP and the second TRP (or the TPMI field) in the DCI, respectively, where the first TPMI field and the second TPMI field are associated with the first TRP and the second TRP (or the first SRS resource set and the second SRS resource set). If the TPMI field does not exist, the "PTRS-DMRS Association" field is ignored. An example is shown in Table 2, where the MSB is for the first TRP associated with the first SRS resource set, and the LSB is for the second TRP associated with the second SRS resource set. Note that the first TPMI field can be an existing "Precoding Information and Layer Number" field in DCI format 0_1 ​​or DCI format 0_2, and the second TPMI field can be a new field containing only precoding information from DCI format 0_1 ​​or DCI format 0_2.

[0167] Table 2: PTRS-DMRS Association for UL PTRS Ports with Duplicate PUSCH Configuration when Two SRS Resource Sets are Configured with Purpose Set to "Codebook"

[0168] Note that in the examples in Table 1 and Table 2, one of the first DMRS port and the second DMRS port can be selected. In one embodiment, the above association applies only to a maximum rank of 2. Ranks 3 and 4 are not supported for PUSCH repetition to multiple TRPs.

[0169] In another embodiment, the above association also applies to the maximum rank from 1 to 4, in which case layers 3 and 4 cannot be selected for DMRS-PTRS port association. In this case, if a strong PUSCH layer is associated with one of the third and fourth DMRS ports, phase tracking performance may be degraded.

[0170] Alternatively, by analyzing the codebook structure used for the partially coherent codebook of layer 4 (i.e., the TPMI indices 2 and 3 of the matrix in Table 6.3.1.5-7 of 3GPP TS 38.211, and the pre-... TPMI for Index 3 It was observed that the first and second layers (i.e., associated with the first and second columns of TMPI) are jointly precoded and transmitted from a subset of the transmit antennas (i.e., SRS or PUSCH antenna ports 1000 and 1002). This is because these are typically associated with two co-located antennas with two different polarizations, and these two polarizations usually have similar SINRs. Therefore, for full-rank transmission (rank 4 in this case) and partial phase interference encoder selection, indicating that the first and third DMRS ports are associated with PTRS port 0 has a slight advantage, as they are most likely to have a larger difference in SINR compared to the first and second DMRS ports or the third and fourth DMRS ports. Therefore, the use of the second and fourth DMRS ports is excluded from the DMRS-PTRS port 0 association. Instead, these two bits are used to select between the first and third DMRS ports for the first TRP and the second TRP, respectively. This applies when rank = 4 is used and TPMI = 2 or 3.

[0171] For the same reason, the first DMRS port and the third DMRS port can be selected for PTRS association of the first TRP and the second TRP, respectively. Therefore, in the case of rank 3 or 4, Table 3 applies.

[0172] Table 3: PTRS-DMRS Association for UL PTRS Ports with PUSCH Duplicates when Two SRS Resource Sets are configured for Purpose set to "Codebook" and indicate Rank = 3 or 4 in the TMPI field of the DCI.

[0173]

[0174] In another embodiment, Table 3 is applied only when a subset of the codebook is configured as “partial and noncoherent” and / or “noncoherent” or when certain TPMIs are indicated.

[0175] In an alternative embodiment, when the higher layer configures one PT-RS port per TRP and if the DCI schedules PUSCH repetition for two TRPs for non-codebook-based PUSCH transmission, then when the maximum number of PUSCH transport layers (i.e., rank) is configured to 4, there are two “PTRS-DMRS association” fields in the DCI. The first “PTRS-DMRS association” field in the DCI is associated with the first SRS resource set, and the second “PTRS-DMRS association” field in the DCI is associated with the second SRS resource set, wherein if the SRI field exists, the first and second SRS resource sets are associated with the first and second SRI fields in the DCI. If the SRI field does not exist, the PT-RS field is ignored. Note that in some cases, each “PTRS-DMRS association” field may be directly associated with each SRI field in the DCI.

[0176] In another embodiment, even when two SRS resource sets are configured (i.e., there are two SRI fields in the scheduling DCI), the UE can schedule PUSCH transmissions toward only one of the TRPs. In this embodiment, PUSCH is repeated toward the same TRP at multiple transmission times using the SRI indicated in one of the two SRI fields in the DCI (while the other SRI field is ignored by the UE). Then, to associate PTRS with DMRS, the UE uses a "PTRS-DMRS association" field associated with the SRS resource set corresponding to the SRI field used for PUSCH scheduling. For example, if PUSCH is scheduled only based on the first SRI field, the UE uses only the first "PTRS-DMRS association" field to determine PTRS-DMRS association. In this example, both the first SRI field and the first "PTRS-DMRS association" field correspond to the same SRS resource set (e.g., the first SRS resource set). This embodiment can be applied to codebook-based or non-codebook-based PUSCH transmissions. This embodiment is applicable to cases where higher layers configure one or two PTRS ports per TRP.

[0177] In another embodiment, for codebook-based PUSCH transmission, there are two "PTRS-DMRS association" fields in the DCI, and the first and second "PTRS-DMRS association" fields in the DCI are associated with the first and second TPMI fields in the DCI, respectively. This embodiment is applicable to the case where TPMI fields exist, wherein the first and second TPMI fields are associated with the first and second SRS resource sets. If the TPMI field does not exist, the "PTRS-DMRS association" field is ignored.

[0178] When a higher layer configures a PT-RS port and the PUSCH for a single TRP is scheduled by DCI, the PT-RS and DM-RS associations are as follows according to Table 7.3.1.1.2-25 of 3GPP TS 38.212. In some embodiments, when a higher layer configures a PT-RS port and the PUSCH for multiple TRPs is scheduled via DCI containing two “PTRS-DMRS association” fields (i.e., one field for each TRP), the PT-RS and DM-RS associations corresponding to each of the two “PTRS-DMRS association” fields are as follows according to Table 7.3.1.1.2-25 of 3GPP TS 38.212.

[0179] In an additional embodiment, when the configuration repeats the PUSCH toward two or more TRPs, the PTRS-DMRS association is only valid for transports toward one of the TRPs (e.g., the first / lowest SRI), while the default association given by the specification (e.g., always the first DMRS port, which shares the PTRS port) is used for the other TRPs.

[0180] 1.2 High-level configuration: Two PT-RS ports per TRP

[0181] In at least some of the embodiments below, a single PTRS-DMRS associated field in the DCI is assumed.

[0182] When a higher layer configures two PT-RS ports (i.e., PT-RS ports 0 and 1) for PUSCH transmissions per TRP, and if PUSCH transmissions to both TRPs are repeatedly scheduled by the DCI, in one embodiment, the MSB of the "PTRS-DMRS Association" field in the DCI is associated with PT-RS port 0, and the LSB of the same field is associated with PT-RS port 1. The same PT-RS and DM-RS associations indicated by the "PTRS-DMRS Association" field in the DCI apply to PUSCH transmissions to both TRPs.

[0183] Alternatively, the MSB of the “PTRS-DMRS Association” field in the DCI is used for the first TRP, and the LSB of the field is used for the second TRP. The MSB indicates the DMRS port associated with PT-RS port 0, and the DMRS port associated with PT-RS port 1 is derived from the DMRS port associated with PT-RS port 0.

[0184] exist Figure 8 The example shown illustrates SRS ports, DMRS ports, and PT-RS ports. It assumes that the first SRI field in the DCI indicates an SRS resource with four ports (ports 1000 to 1003), the associated TPMI field in the DCI (e.g., the first TPMI field) indicates rank 4 and TPMI, and the "Antenna Port" field in the DCI indicates four DMRS ports {k1, k2, k3, k4}. According to 3GPP TS38.214, if two PT-RS ports are configured, SRS ports 1000 and 1002 are associated with one PTRS port, and SRS ports 1001 and 1003 are associated with the other PTRS port. SRS ports 1000 and 1002 form a first SRS port group, and SRS ports 1001 and 1003 form a second SRS port group. Note that SRS ports and PUSCH ports are the same and interchangeable.

[0185] For rank 4, two DMRS ports {A1, A2} are associated with the first SRS port group, and another two DMRS ports {B1, B2} are associated with the second SRS port group, where Ai, Bi ∈ {k1, k2, k3, k4}, i = 1, 2. The association of DMRS ports with SRS ports is implicitly indicated in the TPMI. For example, if TPMI index 2 in Table 6.3.1.5-7 of 3GPP TS 38.211 is indicated, then the corresponding precoding matrix is... The first two DMRS ports are associated with the first SRS port group, and the next two DMRS ports are associated with the second SRS port group. The MSB indicator in the "PTRS-DMRS Association" field of the DCI specifies that if MSB = 0, DMRS port A1 is used for PT-RS port 0 and DMRS port B1 is used for PT-RS port 1; or if MSB = 1, DMRS port A2 is used for PT-RS port 0 and DMRS port B2 is used for PT-RS port 1. This is in... Figure 9 It is shown in the middle.

[0186] When rank 3 is specified, one DMRS port will be associated with one SRS port group, and two DMRS ports will be associated with another SRS port group. The MSB of the "PTRS-DMRS Association" field indicates that one of the two DMRS ports in the SRS port group is used for the PT-RS port associated with that SRS port group. For example, if the first DMRS port is associated with the first SRS port group, and the second and third DMRS ports are associated with the second SRS port group, and if the MSB is set to 0, then the second DMRS port is selected for PT-RS port 1. Otherwise, if the MSB is set to 1, then the third DMRS port is selected for PT-RS port 1. The first DMRS port is associated with PT-RS port 0. Figure 10 The example shown illustrates how, in rank 3, the DMRS port associated with the PUSCH used to send to the first TRP is determined to be paired with the PTRS port.

[0187] When rank 2 is indicated, and if the two associated DMRS ports are associated with the same SRS port group, the MSB of the "PTRS-DMRS Association" field indicates that one of the two DMRS is used for the PT-RS port associated with the SRS port group, and the other PT-RS port is not sent. Otherwise, the "PTRS-DMRS Association" field can be ignored, and each PTRS port is associated with the DMRS port associated with each SRS port group.

[0188] The same process applies to determining the DMRS port for the PT-RS port using the LSB of the “PTRS-DMRS Association” field in the DCI for the second TPR.

[0189] When two PT-RS ports are configured at the higher layer, and if the PUSCH to a single TRP is scheduled by DCI, the association between PT-RS and DM-RS is in accordance with Table 7.3.1.1.2-26 of 3GPP TS 38.212.

[0190] In an additional embodiment, when the PUSCH is repeatedly configured toward two or more TPRs, the PTRS-DMRS association is valid only for transports toward one of the TPRs (e.g., associated with the first SRI field in the DCI), while the default association given by the specification is used for the other TPRs (e.g., always the first DMRS port, which shares the PTRS port).

[0191] In an alternative embodiment, when the higher layer configures two PT-RS ports (PT-RS port 0 and PT-RS port 1) for each TRP, and if PUSCH to both TRPs is repeatedly scheduled by the DCI, then when the maximum number of PUSCH transport layers (i.e., rank) is configured to 4, there are two "PTRS-DMRS association" fields in the DCI. The first "PTRS-DMRS association" field in the DCI is associated with the first SRS resource set, and the second "PTRS-DMRS association" field in the DCI is associated with the second SRS resource set, wherein if the SRI field exists, the first and second SRS resource sets are associated with the first and second SRI fields in the DCI. If the SRI field does not exist, the first and second "PTRS-DMRS association" fields in the DCI are associated with the first and second TPMI fields in the DCI. If neither the SRI nor the TPMI fields exist, the PT-RS field is ignored. The PT-RS and DMRS association for each of the two “PTRS-DMRS association” fields is based on Table 7.3.1.1.2-25 of 3gpp TS 38.212.

[0192] In another embodiment, for non-codebook-based PUSCH transmissions toward two TRPs, the number of PT-RS ports determined for each TRP can be different (i.e., one PT-RS port for TRP1 and two PT-RS ports for TRP2). In this case, the two “PTRS-DMRS Association” fields in the DCI can be used to provide the association between the PT-RS and DMRS for each TRP. The number of PTRS ports for each TRP is determined based on the SRI indicated by the two SRI fields in the DCI (i.e., one SRI field for each TRP). For PUSCH transmissions (or subsets of PUSCH repetitions) corresponding to a single PT-RS port, the PTRS-DMRS association is provided by the corresponding “PTRS-DMRS Association” field according to Table 7.3.1.1.2-25 of 3GPP TS 38.212. For PUSCH transmissions (or the remaining set of PUSCH repetitions) corresponding to two PT-RS ports, the PTRS-DMRS association is provided by the corresponding “PTRS-DMRS association” field in Table 7.3.1.1.2-26 of 3GPP TS 38.212.

[0193] 1.3 UE Capability Signaling for PT-RS

[0194] For PUSCH repetitions toward multiple TRPs, the UE can report a new capability regarding the number of supported PT-RS ports, supplementing the existing reporting parameters "onePortsPTRS" and "twoPortsPTRS-UL" (see gpp TS38.306v16.3.0). The new parameter will indicate the maximum number of PT-RS ports toward each TRP and applies only to PUSCH repetitions toward multiple TRPs. This is because different receive antenna panels can be used at the UE for PUSCH transmissions to a single TRP and to multiple TRPs.

[0195] 1.4PT-RS power boost

[0196] The factor associated with the PUSCH to PT-RS power ratio per RE per layer is indicated to the UE via the power boost factor ptrs-Power in the PTRS-UplinkConfig IE, configured by the higher layer.

[0197] For PT-RS used to pusch multiple TRPs, individual power boost configurations for each TRP can be supported. The PT-RS boost factor for each TRP can be configured differently for each TRP. The value indicated by ptrs-Power in the PTRS-UplinkConfig IE can be used to support two TRPs. In one embodiment, values ​​p00 and p01 are used when both TRPs are configured with the same power boost, and values ​​p10 and p11 are used when the first and second TRPs are configured with different power boost factors.

[0198] When configuring PT-RS for two TRPs, and if the UE can apply different power boost factors to the PT-RS associated with different TRPs, p10 and p11 can be used to configure PTRS-Power. When p10 is configured, the UE applies power boost factor 00 to the first TRP and power boost factor 01 to the second TRP; when p11 is configured, the UE applies power boost factor 01 to the first TRP and power boost factor 00 to the second TRP. An example is shown in Table 4. Alternatively, p10 can be mapped to TRP001, TRP100; and p11 can be mapped to TRP000, TRP101.

[0199] Table 6.2.3.1-3: Factors related to the PUSCH and PT-RS power ratio per RE per layer

[0200]

[0201]

[0202] Table 4. Mapping of power boost factors for two TRPs

[0203]

[0204] 2. Further description

[0205] Figure 11A and Figure 11B Operation of a UE 612 and a gNB 602 comprising two TRPs (TRP 1 and TRP 2) according to some embodiments described above is illustrated. Optional steps are indicated by dashed lines / boxes. As shown, the UE 612 reports information to the gNB 602 including (A) support for PUSCH repetition toward multiple TRPs, (B) support for any codebook-based PUSCH with fully coherent, partially coherent, or incoherent UL transmissions, (C) support for a maximum number of MIMO layers for the PUSCH (e.g., 2 or 4), and (D) the number of PTRS ports required for PUSCH transmission to each TRP (step 1100). Note that although in this example, the UE 612 reports all of the above information to the gNB 602, in some embodiments, the UE 612 may report only a portion of this information to the gNB 602. gNB 602 configures UE 612 with (A) multiple SRS resource sets, each SRS resource set associated with a TRP, (B) a maximum (e.g., 1 or 2) number of PTRS ports used for PUSCH transmission to each TRP, and (C) a maximum number of MIMO layers used for PUSCH (e.g., 2 or 4) (step 1102).

[0206] gNB 602 sends a DCI to UE 612 to schedule PUSCH repetitions for multiple TRPs, wherein the DCI includes: (a) a first SRI field and a second SRI field (for non-codebook-based PUSCH and possibly for codebook-based PUSCH) and / or a first TPMI field and a second TPMI field (possibly for codebook-based PUSCH), (b) an antenna port field, and (c) a PTRS-DMRS association field (step 1104). Note that various embodiments of the DCI have been described above, specifically the use of the PTRS-DMRS association field, and the details of those embodiments apply herein. UE 612 receives the DCI and, based on the DCI, determines that a first DMRS port associated with a first PTRS port is used for PUSCH transmission to the first TRP (TRP 1) (step 1106). If the maximum number of PTRS ports is 2, UE 612 also determines that a second DMRS port associated with a second PTRS port is used for PUSCH transmission to the first TRP (step 1108). UE 612 also determines, based on DCI, that a third DMRS port associated with the third PTRS port is used for PUSCH transmission to the second TRP (TRP 2) (step 1110). If the maximum number of PTRS ports is 2, UE 612 also determines that a fourth DMRS port associated with the fourth PTRS port is used for PUSCH transmission to the second TRP (step 1112). UE 612 uses the first PTRS port, and if applicable, the second PTRS port, to send PUSCH to the first TRP (TRP 1) (step 1114). UE 612 uses the third PTRS port, and if applicable, the fourth PTRS port, to send PUSCH to the second TRP (TRP 2) (step 1116).

[0207] Figure 12A and Figure 12BOperation of a UE 612 and a gNB 602 comprising two TRPs (TRP 1 and TRP 2) according to some other embodiments of the above embodiments is illustrated. Optional steps are indicated by dashed lines / boxes. As shown, the UE 612 reports information to the gNB 602 including (A) support for PUSCH repetition toward multiple TRPs, (B) support for any codebook-based PUSCH with fully coherent, partially coherent, or incoherent UL transmissions, (C) support for a maximum number of MIMO layers for the PUSCH (e.g., 2 or 4), and (D) the number of PTRS ports required for PUSCH transmission to each TRP (step 1200). Note that although in this example, the UE 612 reports all of the above information to the gNB 602, in some embodiments, the UE 612 may report only a portion of this information to the gNB 602. gNB 602 configures UE 612 with (A) multiple SRS resource sets, each SRS resource set associated with a TRP, (B) a maximum (e.g., 1 or 2) number of PTRS ports used for PUSCH transmission to each TRP, and (C) a maximum number of MIMO layers used for PUSCH (e.g., 4) (step 1202).

[0208] gNB 602 sends a DCI to UE 612 to schedule PUSCH repetitions for multiple TRPs, wherein the DCI includes: (a) a first SRI field and a second SRI field (for non-codebook-based PUSCH and possibly for codebook-based PUSCH) and / or a first TPMI field and a second TPMI field (possibly for codebook-based PUSCH), (b) an antenna port field, and (c) a first PTRS-DMRS association field and a second PTRS-DMRS association field (step 1204). Note that various embodiments of the DCI have been described above, specifically the use of the two PTRS-DMRS association fields, and the details of those embodiments apply herein. UE 612 receives the DCI and uses the first PTRS-DMRS association field to determine the first DMRS port associated with the first PTRS port for PUSCH transmission to the first TRP (TRP 1) (step 1206). If the maximum number of PTRS ports is 2, UE 612 also uses the first PTRS-DMRS association field to determine the second DMRS port associated with the second PTRS port for PUSCH transmission to the first TRP (step 1208). UE 612 also uses the second PTRS-DMRS association field to determine the third DMRS port associated with the third PTRS port for PUSCH transmission to the second TRP (TRP 2) (step 1210). If the maximum number of PTRS ports is 2, UE 612 also uses the second PTRS-DMRS association field to determine the fourth DMRS port associated with the fourth PTRS port for PUSCH transmission to the second TRP (step 1212). UE 612 uses the first PTRS port, and if applicable, the second PTRS port, to send PUSCH to the first TRP (TRP 1) (step 1214). UE 612 uses the third PTRS port, and if applicable, the fourth PTRS port, to send PUSCH to the second TRP (TRP 2) (step 1216).

[0209] Figure 13This is a schematic block diagram of a radio access node 1300 according to some embodiments of the present disclosure. Optional features are indicated by dashed boxes. The radio access node 1300 may be, for example, a base station 602 or 606, or a network node implementing all or part of the functions of the base station 602 or gNB described herein, or a TRP or a network node implementing at least part of the functions of the TRP described herein. As shown, the radio access node 1300 includes a control system 1302, which includes one or more processors 1304 (e.g., a central processing unit (CPU), application-specific integrated circuit (ASIC), field-programmable gate array (FPGA), etc.), a memory 1306, and a network interface 1308. The one or more processors 1304 are also referred to herein as processing circuitry. In addition, the radio access node 1300 may include one or more radio units 1310, each radio unit 1310 including one or more transmitters 1312 and one or more receivers 1314 coupled to one or more antennas 1316. The radio unit 1310 may be referred to as radio interface circuitry or part of radio interface circuitry. In some embodiments, the radio units 1310 are external to the control system 1302 and connected to the control system 1302 via, for example, a wired connection (e.g., fiber optic cable). However, in some other embodiments, the radio units 1310 and possibly the antennas 1316 are integrated with the control system 1302. One or more processors 1304 operate to provide one or more functions of the radio access node 1300 as described herein (e.g., one or more functions of the base station 602 or 606 or gNB described herein, or one or more functions of the TRP or a network node implementing at least some of the functions of the TRP described herein). In some embodiments, the functions are implemented in software, which is stored, for example, in memory 1306 and executed by one or more processors 1304.

[0210] Figure 14This is a schematic block diagram illustrating a virtualized embodiment of a radio access node 1300 according to some embodiments of the present disclosure. This discussion is equally applicable to other types of network nodes. Furthermore, other types of network nodes may have similar virtualization architectures. Similarly, optional features are indicated by dashed boxes. As used herein, a “virtualized” radio access node is an implementation of radio access node 1300 in which at least a portion of the functionality of radio access node 1300 is implemented as virtual components(e.g., via virtual machines(e.g., executed on physical processing nodes(e.g., in multiple networks)). As shown in this example, as described above, radio access node 1300 may include a control system 1302 and / or one or more radio units 1310. Control system 1302 may be connected to radio units(e.g., via fiber optic cables). Radio access node 1300 includes one or more processing nodes 1400 that are coupled to or included as part of network 1402. If present, the control system 1302 or (multiple) radio units are connected to (multiple) processing nodes 1400 via network 1402. Each processing node 1400 includes one or more processors 1404 (e.g., CPU, ASIC, FPGA, etc.), memory 1406, and network interface 1408.

[0211] In this example, the functions 1410 of the radio access node 1300 described herein (e.g., one or more functions of the base station 602 or 606 or gNB described herein, or one or more functions of the TRP or a network node implementing at least some of the functions of the TRP described herein) are implemented at one or more processing nodes 1400, or distributed in any desired manner between one or more processing nodes 1400 and the control system 1302 and / or (multiple) radio units 1310. In some specific embodiments, some or all of the functions 1410 of the radio access node 1300 described herein are implemented as virtual components executed by one or more virtual machines implemented in (multiple) virtual environments hosted by (multiple) processing nodes 1400. As will be understood by those skilled in the art, additional signaling or communication is used between (multiple) processing nodes 1400 and the control system 1302 to perform at least some of the desired functions 1410. It is worth noting that in some embodiments, the control system 1302 may be omitted, in which case (multiple) radio units 1310 communicate directly with the processing node 1400 via (multiple) appropriate network interfaces.

[0212] In some embodiments, a computer program including instructions is provided that, when executed by at least one processor, causes at least one processor to perform the functions of a radio access node 1300 according to any embodiment described herein, or the functions of a node (e.g., a processing node 1400) implementing one or more functions 1410 of the radio access node 1300 in a virtual environment. In some embodiments, a carrier including the computer program product described above is provided. The carrier is one of electronic signals, optical signals, radio signals, or a computer-readable storage medium (e.g., a non-transient computer-readable medium such as a memory).

[0213] Figure 15 This is a schematic block diagram of a radio access node 1300 according to some other embodiments of the present disclosure. The radio access node 1300 includes one or more modules 1500, each module 1500 being implemented in software. The modules(s) 1500 provide the functionality of the radio access node 1300 described herein (e.g., one or more functions of the base station 602 or 606 or gNB described herein, or one or more functions of the TRP or a network node implementing at least a portion of the TRP's functionality described herein). This discussion also applies to... Figure 14 The processing node 1400, wherein the module 1500 may be implemented at one of the processing nodes 1400, or distributed among multiple processing nodes 1400 and / or distributed between multiple processing nodes 1400 and the control system 1302.

[0214] Figure 16 This is a schematic block diagram of a wireless communication device 1600 according to some embodiments of the present disclosure. The wireless communication device 1600 may be the wireless communication device 612 or UE described herein. As shown, the wireless communication device 1600 includes one or more processors 1602 (e.g., CPU, ASIC, FPGA, and / or the like), a memory 1604, and one or more transceivers 1606. Each transceiver 1606 includes one or more transmitters 1608 and one or more receivers 1610, and is coupled to one or more antennas 1612. The transceivers(s)1606 include radio front-end circuitry connected to the antennas(s)1612, which, as will be understood by those skilled in the art, is configured to modulate signals transmitted between the antennas(s)1612 and the processors(s)1602. The processor 1602 is also referred to herein as processing circuitry. The transceivers 1606 are also referred to herein as radio circuitry. In some embodiments, the functions of the wireless communication device 1600 (e.g., one or more functions of the wireless communication device 612 or the UE) described above may be implemented entirely or partially in software, for example, stored in memory 1604 and executed by processor(s) 1602(s). Note that the wireless communication device 1600 may include... Figure 16 Additional components not shown, such as, for example, one or more user interface components (e.g., input / output interfaces including displays, buttons, touch screens, microphones, speakers(s) and / or the like, and / or any other components for allowing information to be input to and / or output from the wireless communication device 1600), power supplies (e.g., batteries and associated power circuitry), etc.

[0215] In some embodiments, a computer program including instructions is provided that, when executed by at least one processor, causes at least one processor to perform the functions of a wireless communication device 1600 according to any embodiment described herein (e.g., one or more functions of a wireless communication device 612 or UE). In some embodiments, a carrier including the aforementioned computer program product is provided, the carrier being one of electronic signals, optical signals, radio signals, or computer-readable storage media (e.g., a non-transient computer-readable medium such as a memory).

[0216] Figure 17 This is a schematic block diagram of a wireless communication device 1600 according to some other embodiments of the present disclosure. The wireless communication device 1600 includes one or more modules 1700, each module 1700 being implemented in software. The modules(multiple) Modules 1700 provide the functionality of the wireless communication device 1600 described herein (e.g., one or more functions of the wireless communication device 612 or UE).

[0217] refer to Figure 18 According to one embodiment, the communication system includes a telecommunications network 1800, such as a 3GPP-type cellular network, which includes an access network 1802 (such as a RAN) and a core network 1804. The access network 1802 includes multiple base stations 1806A, 1806B, and 1806C, such as Node Bs, eNBs, gNBs, or other types of radio access points (APs), each base station defining a corresponding coverage area 1808A, 1808B, or 1808C. Each base station 1806A, 1806B, or 1806C can be connected to the core network 1804 via a wired or wireless connection 1810. A first UE 1812 located in coverage area 1808C is configured to wirelessly connect to or be paged by the corresponding base station 1806C. A second UE 1814 located in coverage area 1808A can wirelessly connect to the corresponding base station 1806A. Although multiple UEs 1812 and 1814 are shown in this example, the disclosed embodiments are equally applicable to situations where a single UE is in the coverage area or a single UE is connected to the corresponding base station 1806.

[0218] Telecommunication network 1800 is itself connected to host computer 1816, which may be implemented in the hardware and / or software of a standalone server, a cloud-implemented server, a distributed server, or as a processing resource in a server farm. Host computer 1816 may be under the ownership or control of a service provider, or may be operated by or on behalf of the service provider. Connections 1818 and 1820 between telecommunication network 1800 and host computer 1816 may extend directly from core network 1804 to host computer 1816, or via optional intermediate network 1822. Intermediate network 1822 may be one or more of a public network, a private network, or a hosted network; intermediate network 1822 (if any) may be a backbone network or the Internet; in particular, intermediate network 1822 may include two or more subnetworks (not shown).

[0219] Figure 18 The communication system as a whole implements connectivity between connected UEs 1812 and 1814 and host computer 1816. This connectivity can be described as an over-the-top (OTT) connection 1824. Host computer 1816 and connected UEs 1812 and 1814 are configured to transmit data and / or signaling via OTT connection 1824 using access network 1802, core network 1804, any intermediate network 1822, and possibly other infrastructure (not shown) acting as intermediaries. OTT connection 1824 can be transparent in the sense that the participating communication devices through which OTT connection 1824 passes are unaware of the routes of uplink and downlink communications. For example, base station 1806 may not be informed or need not be informed of past routes of incoming downlink communications originating from host computer 1816 that are to be forwarded (e.g., switched) to connected UE 1812. Similarly, base station 1806 does not need to know the future routes of outgoing uplink communications originating from UE 1812 to host computer 1816.

[0220] According to one embodiment, reference will now be made to Figure 19This describes an example implementation of the UE, base station, and host computer discussed in the preceding paragraphs. In the communication system 1900, the host computer 1902 includes hardware 1904, which includes a communication interface 1906 configured to establish and maintain wired or wireless connections with interfaces to different communication devices of the communication system 1900. The host computer 1902 also includes processing circuitry 1908, which may have storage and / or processing capabilities. Specifically, the processing circuitry 1908 may include one or more programmable processors, ASICs, FPGAs, or combinations thereof (not shown) suitable for executing instructions. The host computer 1902 also includes software 1910, which is stored in or accessible by the host computer 1902 and can be executed by the processing circuitry 1908. The software 1910 includes a host application 1912. The host application 1912 is operable to provide services to remote users, such as UE 1914 connected via an OTT connection 1916 terminated between UE 1914 and host computer 1902. When providing services to remote users, host application 1912 can provide user data transmitted using OTT connection 1916.

[0221] The communication system 1900 also includes a base station 1918 provided in the telecommunications system. The base station 1918 includes hardware 1920 that enables it to communicate with the host computer 1902 and the UE 1914. Hardware 1920 may include a communication interface 1922 and a radio interface 1924. The communication interface 1922 is used to establish and maintain wired or wireless connections with different communication devices of the communication system 1900, and the radio interface 1924 is used to establish and maintain connections with the coverage area served by the base station 1918. Figure 19 At least a wireless connection 1926 is provided for UE 1914 (not shown in the diagram). Communication interface 1922 can be configured to facilitate a connection 1928 to host computer 1902. Connection 1928 can be direct or via the core network of a telecommunications system. Figure 19 (not shown) and / or via one or more intermediate networks outside the telecommunications system. In the illustrated embodiment, the hardware 1920 of base station 1918 also includes processing circuitry 1930, which may include one or more programmable processors, ASICs, FPGAs, or combinations thereof (not shown) adapted to execute instructions. Base station 1918 also has software 1932 stored internally or accessible via an external connection.

[0222] The communication system 1900 also includes the previously mentioned UE 1914. The hardware 1934 of UE 1914 may include a radio interface 1936 configured to establish and maintain a radio connection 1926 with a base station serving the coverage area currently occupied by UE 1914. The hardware 1934 of UE 1914 also includes processing circuitry 1938, which may include one or more programmable processors, ASICs, FPGAs, or combinations thereof (not shown) suitable for executing instructions. UE 1914 also includes software 1940, which is stored in or accessible by UE 1914 and executable by processing circuitry 1938. Software 1940 includes a client application 1942. Client application 1942 can operate to provide services to human or non-human users via UE 1914 with the support of host computer 1902. In host computer 1902, the running host application 1912 can communicate with the executing client application 1942 via OTT connection 1916 terminated between UE 1914 and host computer 1902. When providing services to a user, client application 1942 can receive request data from host application 1912 and provide user data in response to the request data. OTT connection 1916 can transmit both request data and user data. Client application 1942 can interact with the user to generate the user data it provides.

[0223] It is important to note that Figure 19 The host computer 1902, base station 1918, and UE 1914 shown can be respectively connected to Figure 20 The host computer 2016, base station 2006A, 2006B, 2006C, and UE 2012, 2014 are similar to or identical to each other. That is to say, the internal workings of these entities can be as follows: Figure 19 As shown, and independently, the surrounding network topology can be Figure 20 The network topology.

[0224] exist Figure 19 The diagram abstractly depicts OTT connection 1916 to illustrate communication between host computer 1902 and UE 1914 via base station 1918, without explicitly mentioning any intermediate devices or the precise routing of messages through them. The network infrastructure can determine the route, which can be configured to be hidden from UE 1914 or the service provider operating host computer 1902, or both. When OTT connection 1916 is active, the network infrastructure can further make decisions that dynamically change the route (e.g., based on network load balancing considerations or reconfiguration).

[0225] The wireless connection 1926 between UE 1914 and base station 1918 conforms to the teachings of the embodiments described throughout this disclosure. One or more of the various embodiments improve the performance of OTT services provided to UE 1914 using OTT connection 1916, wherein wireless connection 1926 forms the final segment.

[0226] Measurement procedures may be provided for the purpose of monitoring data rates, latency, and other factors improved by one or more embodiments. Optional network functions may also be present for reconfiguring the OTT connection 1916 between host computer 1902 and UE 1914 in response to changes in measurement results. The measurement procedures and / or network functions for reconfiguring the OTT connection 1916 may be implemented in software 1910 and hardware 1904 of host computer 1902, or in software 1940 and hardware 1934 of UE 1914, or both. In some embodiments, sensors (not shown) may be deployed in or associated with communication devices through which the OTT connection 1916 traverses; the sensors may participate in the measurement procedure by providing values ​​of the monitored quantities illustrated above, or by providing values ​​of other physical quantities from which software 1910, 1940 can calculate or estimate the monitored quantities. Reconfiguration of the OTT connection 1916 may include message formats, retransmission settings, preferred routing, etc.; reconfiguration does not need to affect base station 1918, and it may be unknown or imperceptible to base station 1918. Such processes and functions are known and practiced in the art. In some embodiments, the measurement may involve dedicated UE signaling to facilitate the host computer 1902 in measuring throughput, propagation time, latency, etc. The measurement can be achieved by software 1910 and 1940 causing messages (especially empty or "fake" messages) to be sent using OTT connection 1916 while monitoring propagation time, errors, etc.

[0227] Figure 20 This is a flowchart illustrating a method implemented in a communication system according to one embodiment. The communication system includes a host computer, a base station, and a UE, and may be a reference. Figure 18 and Figure 21 Those described. To simplify this disclosure, this section will only include those... Figure 20Referring to the accompanying drawings. In step 2000, the host computer provides user data. In sub-step 2002 of step 2000 (which may be optional), the host computer provides user data by executing a host application. In step 2004, the host computer initiates a transmission carrying user data to the UE. According to the teachings of the embodiments described throughout this disclosure, in step 2006 (which may be optional), the base station sends the user data carried in the transmission initiated by the host computer to the UE. In step 2008 (which may be optional), the UE executes a client application associated with the host application executed by the host computer.

[0228] Figure 21 This is a flowchart illustrating a method implemented in a communication system according to one embodiment. The communication system includes a host computer, a base station, and a UE, and may be a reference. Figure 18 and Figure 19 Those described. To simplify this disclosure, this section will only include those... Figure 21 Refer to the accompanying drawings. In step 2100 of the method, the host computer provides user data. In an optional sub-step (not shown), the host computer provides user data by executing a host application. In step 2102, the host computer initiates a transmission carrying user data to the UE. According to the teachings of the embodiments described throughout this disclosure, the transmission can be carried out via a base station. In step 2104 (which may be optional), the UE receives the user data carried in the transmission.

[0229] Figure 22 This is a flowchart illustrating a method implemented in a communication system according to one embodiment. The communication system includes a host computer, a base station, and a UE, and may be a reference. Figure 18 and Figure 19 Those described. To simplify this disclosure, this section will only include those... Figure 22 Referring to the accompanying drawings. In step 2200 (which may be optional), the UE receives input data provided by the host computer. Additionally or alternatively, in step 2202, the UE provides user data. In sub-step 2204 of step 2200 (which may be optional), the UE provides user data by executing a client application. In sub-step 2206 of step 2202 (which may be optional), the UE executes a client application that provides user data in response to the received input data provided by the host computer. When providing user data, the executed client application may further consider user input received from the user. Regardless of the specific manner in which user data is provided, in sub-step 2208 (which may be optional), the UE initiates the transmission of user data to the host computer. According to the teachings of the embodiments described throughout this disclosure, in step 2210 of the method, the host computer receives user data sent from the UE.

[0230] Figure 23 This is a flowchart illustrating a method implemented in a communication system according to one embodiment. The communication system includes a host computer, a base station, and a UE, and may be a reference. Figure 18 and Figure 19 Those described. To simplify this disclosure, this section will only include those... Figure 23 Referring to the accompanying drawings. Based on the teachings of the embodiments described throughout this disclosure, in step 2300 (which may be optional), the base station receives user data from the UE. In step 2302 (which may be optional), the base station initiates a transmission of the received user data to the host computer. In step 2304 (which may be optional), the host computer receives the user data carried in the transmission initiated by the base station.

[0231] Any suitable steps, methods, features, functions, or benefits disclosed herein may be performed by one or more functional units or modules of one or more virtual devices. Each virtual device may include multiple such functional units. These functional units may be implemented by processing circuitry, which may include one or more microprocessors or microcontrollers, as well as other digital hardware, including digital signal processors (DSPs), application-specific digital logic, etc. The processing circuitry may be configured to execute program code stored in memory, which may include one or more types of memory, such as read-only memory (ROM), random access memory (RAM), cache memory, flash memory devices, optical storage devices, etc. The program code stored in memory includes program instructions for executing one or more telecommunications and / or data communication protocols and instructions for executing one or more techniques described herein. In some implementations, the processing circuitry may be used to cause corresponding functional units to perform corresponding functions according to one or more embodiments of this disclosure.

[0232] Although the processes in the figures may illustrate a particular order of operations performed by certain embodiments of this disclosure, it should be understood that such order is exemplary (e.g., alternative embodiments may perform operations in a different order, combine certain operations, overlap certain operations, etc.).

[0233] Some example embodiments of this disclosure are as follows:

[0234] Group A Examples

[0235] Example 1: A method performed by a wireless communication device, comprising:

[0236] • Receive downlink control information (DCI) from the base station (1104; 1204), where:

[0237] DCI schedules repeated Physical Uplink Shared Channel (PUSCH) to two (or more) transmit / receive points via TRP; and

[0238] DCI includes:

[0239] Antenna port field; and

[0240] At least one PTRS-DMRS associated field;

[0241] • Based on the value of at least one PTRS-DMRS association field included in the DCI, determine (1106-1108; 1206-1208) at least one DMRS port associated with at least one PTRS port for transmission to the PUSCH of the first TRP;

[0242] • Based on the value of at least one PTRS-DMRS association field included in the DCI, determine (1110-1112; 1210-1212) at least one DMRS port associated with at least one PTRS port for transmission to the PUSCH of the second TRP;

[0243] • Send (1114; 1214) (multiple) PUSCH repeats to the first TRP using at least one PTRS port used for PUSCH transmission to the first TPR; and • Send (1116; 1216) (multiple) PUSCH repeats to the second TRP using at least one PTRS port used for PUSCH transmission to the first TPR.

[0244] Example 2: According to the method of Example 1, at least one PTRS-DMRS association field is a single PTRS-DMRS association field.

[0245] Example 3: According to the method of Example 2, the single PTRS-DMRS association field is a 2-bit field.

[0246] Example 4: According to the method of Example 2 or 3, wherein:

[0247] • Determine (1106-1108) at least one DMRS port associated with at least one PTRS port for transmitting to the PUSCH of the first TRP a value including a single PTRS-DMRS association field included in the DCI, and determine (1106) a first DMRS port associated with the first PTRS port for transmitting to the PUSCH of the first TRP.

[0248] • Determine (1110-1112) at least one DMRS port associated with at least one PTRS port for transmitting to the PUSCH of the second TRP a value including a single PTRS-DMRS association field included in the DCI, and determine (1110) at least one second DMRS port associated with the second PTRS port for transmitting to the PUSCH of the second TRP.

[0249] Sending (1114) (multiple) PUSCH repeats to the first TRP includes sending (1114) (multiple) PUSCH repeats to the first TRP using the first PTRS port associated with the first DMRS port; and

[0250] Sending (1116) (multiple) PUSCH repeats to the second TRP includes sending (1116) (multiple) PUSCH repeats to the second TRP using the second PTRS port associated with the second DMRS port.

[0251] Example 5: According to the method of Example 4, wherein:

[0252] • A single PTRS-DMRS association field is a 2-bit field;

[0253] • DCI is used for non-codebook-based PUSCH transmission and also includes a first SRI field and a second SRI field;

[0254] • The most significant bit (MSB) of a single PTRS-DMRS association field is associated with the first SRI field;

[0255] • The least significant bit (LSB) of a single PTRS-DMRS associated field is associated with the second SRI field.

[0256] Example 6: According to the method of Example 4, wherein:

[0257] • A single PTRS-DMRS association field is a 2-bit field;

[0258] • DCI is used for codebook-based PUSCH transmission and also includes a first TPMI field and a second TPMI field;

[0259] • The most significant bit (MSB) of a single PTRS-DMRS association field is associated with the first TPMI field;

[0260] • The least significant bit (LSB) of a single PTRS-DMRS associated field is associated with the second TPMI field.

[0261] Example 7: According to the method of Example 5 or 6, wherein:

[0262] ● The maximum rank of PUSCH transmission is up to 2 or 4;

[0263] • The MSB of a single PTRS-DMRS association field indicates that one of the first or second DMRS ports indicated in the antenna port field is associated with the first PTRS port for PUSCH transmission to the first TRP; and

[0264] • The LSB indication in the single PTRS-DMRS association field indicates that one of the first and second DMRS ports indicated in the antenna port field is associated with the second PTRS port for PUSCH transmission to the second TRP.

[0265] Example 8: According to the method of Example 5 or 6, wherein:

[0266] • Indicates rank 3 or 4 in DCI;

[0267] • The MSB of a single PTRS-DMRS association field indicates that one of the first and third DMRS ports indicated in the antenna port field is associated with the first PTRS port for PUSCH transmission to the first TRP; and

[0268] • The LSB indication in the single PTRS-DMRS association field indicates that one of the first and third DMRS ports indicated in the antenna port field is associated with the second PT-RS port for PUSCH transmission to the second TRP.

[0269] Example 9: According to the method of Example 2 or 3, wherein the wireless communication device (612) is configured with two PTRS ports for each TRP, and:

[0270] • Determining (1106-1108) that at least one DMRS port associated with at least one PTRS port is used for PUSCH transmission to the first TRP includes:

[0271] Based on the value of a single PTRS-DMRS association field included in the DCI, it is determined (1106) that the first DMRS port associated with the first PTRS port is used for PUSCH transmission to the first TRP;

[0272] Based on the value of a single PTRS-DMRS association field included in the DCI, it is determined (1108) that the second DMRS port associated with the second PTRS port is used for PUSCH transmission to the first TRP; and

[0273] • Determining (1110-1112) that at least one DMRS port associated with at least one PTRS port is used for PUSCH transmission to the second TRP includes:

[0274] Based on the value of a single PTRS-DMRS association field included in the DCI, it is determined that (1110) the third DMRS port associated with the third PTRS port is used for PUSCH transmission to the second TRP; and

[0275] Based on the value of a single PTRS-DMRS association field included in the DCI, it is determined that (1112) the fourth DMRS port associated with the fourth PTRS port is used for PUSCH transmission to the second TRP; and

[0276] Sending (1114) (multiple) PUSCHs to the first TRP includes sending (1114) (multiple) PUSCHs to the first TRP using the first PTRS port associated with the first DMRS port and the second PTRS port associated with the second DMRS port;

[0277] as well as

[0278] Sending (1116) (multiple) PUSCHs to the second TRP includes sending (1116) (multiple) PUSCHs to the second TRP using the third PTRS port associated with the third DMRS port and the fourth PTRS port associated with the fourth DMRS port.

[0279] Example 10: According to the method of Example 9, wherein:

[0280] • A single PTRS-DMRS association field is a 2-bit field;

[0281] • The most significant bit (MSB) of a single PTRS-DMRS association field is associated with both the first and third PTRS ports;

[0282] • The least significant bit (LSB) of a single PTRS-DMRS association field is associated with the second and fourth PTRS ports.

[0283] Example 11: According to the method of Example 9, wherein:

[0284] • A single PTRS-DMRS association field is a 2-bit field;

[0285] • A single PTRS-DMRS association field is applied only to the first TRP or only to the second TRP.

[0286] Example 12: According to the method of Example 9, wherein the PTRS-DMRS association for another TRP is predefined.

[0287] Example 13: According to the method of Example 9, wherein:

[0288] • A single PTRS-DMRS association field is a 2-bit field;

[0289] • The most significant bit (MSB) of a single PTRS-DMRS associated field indicates:

[0290] The first DMRS port associated with the first PTRS port in the first DMRS port group; and

[0291] The third DMRS port associated with the third PTRS port from the second DMRS port group; and

[0292] • Least significant bit (LSB) indication of a single PTRS-DMRS associated field:

[0293] The second DMRS port associated with the second PTRS port from the first DMRS port group; and

[0294] The fourth DMRS port associated with the fourth PTRS port in the second DMRS port group.

[0295] Example 14: According to the method of Example 13, wherein the first DMRS port is associated with a first PUSCH or SRS port group, and the second DMRS port is associated with a second PUSCH or SRS port group.

[0296] Example 15: According to the method of Example 1, at least one PTRS-DMRS association field includes a first PTRS-DMRS association field and a second PTRS-DMRS association field.

[0297] Example 16: According to the method of Example 15, each PTRS-DMRS association field in the first PTRS-DMRS association field and the second PTRS-DMRS association field is a 2-bit field.

[0298] Example 17: According to the method of Example 15 or 16, wherein:

[0299] • Determine (1206-1208) at least one DMRS port associated with at least one PTRS port for transmitting to the PUSCH of the first TRP a value including a first PTRS-DMRS association field included in the DCI, and determine (1206) the first DMRS port associated with the first PTRS port for transmitting to the PUSCH of the first TRP.

[0300] • Determine (1210-1212) at least one DMRS port associated with at least one PTRS port for transmitting values ​​including the second PTRS-DMRS association field included in the DCI to the PUSCH of the second TRP, and determine (1210) at least one DMRS port associated with the second PTRS port for transmitting to the PUSCH of the second TRP.

[0301] Sending (1214) (multiple) PUSCHs to the first TRP includes sending (1214) (multiple) PUSCHs to the first TRP using the first PTRS port associated with the first DMRS port; and

[0302] Sending (1216) (multiple) PUSCHs to the second TRP includes sending (1216) (multiple) PUSCHs to the second TRP using the second PTRS port associated with the second DMRS port.

[0303] Example 18: According to the method of Example 15 or 16, wherein the wireless communication device (612) is configured with two PTRS ports for each TRP, and:

[0304] • Determining (1206-1208) that at least one DMRS port associated with at least one PTRS port is used for PUSCH transmission to the first TRP includes:

[0305] Based on the value of the first PTRS-DMRS association field included in the DCI, it is determined (1206) that the first DMRS port associated with the first PT-RS port is used for PUSCH transmission to the first TRP; and

[0306] Based on the value of the first PTRS-DMRS association field included in the DCI, it is determined that (1208) the second DMRS port associated with the second PTRS port is used for PUSCH transmission to the first TRP;

[0307] • Determining (1210-1212) that at least one DMRS port associated with at least one PTRS port is used for PUSCH transmission to the second TRP includes:

[0308] Based on the value of the second PTRS-DMRS association field included in the DCI, it is determined that (1210) the third DMRS port associated with the third PTRS port is used for PUSCH transmission to the second TRP; and

[0309] Based on the value of the second PTRS-DMRS association field included in the DCI, it is determined that (1212) the fourth DMRS port associated with the fourth PTRS port is used for PUSCH transmission to the second TRP; and

[0310] Sending (1214) (multiple) PUSCHs to the first TRP includes sending (1114) (multiple) PUSCHs to the first TRP using the first PTRS port associated with the first DMRS port and the second PTRS port associated with the second DMRS port;

[0311] as well as

[0312] Sending (1216) (multiple) PUSCHs to the second TRP includes sending (1116) (multiple) PUSCHs to the second TRP using the third PT-RS port associated with the third DMRS port and the fourth PTRS port associated with the fourth DMRS port.

[0313] Example 19: The method according to any one of Examples 1 to 18, wherein each TRP is configured with a PTRS to PUSCH power ratio.

[0314] Example 20: The method according to any of the foregoing embodiments further includes: providing user data; and forwarding the user data to a host computer via transmission to a base station.

[0315] Group B Implementation Examples

[0316] Example 21: A method executed by a base station, comprising:

[0317] • Send downlink control information (DCI) (1104; 1204) to the wireless communication device (612), wherein:

[0318] DCI schedules repeated physical uplink shared channel PUSCH to two (or more) transmit / receive points via TRP; and

[0319] DCI includes:

[0320] Antenna port field

[0321] At least one PTRS-DMRS associated field;

[0322] ·in:

[0323] At least one DMRS port associated with at least one PTRS port is used for PUSCH transmission to the first TRP based on the value of at least one PTRS-DMRS association field included in the DCI; and

[0324] The at least one DMRS port associated with at least one PTRS port is used for PUSCH transmission to the second TRP based on the value of at least one PTRS-DMRS association field included in the DCI.

[0325] Example 22: According to the method of Example 21, at least one PTRS-DMRS association field is a single PTRS-DMRS association field.

[0326] Example 23: According to the method of Example 22, wherein a single PTRS-DMRS association field is a 2-bit field.

[0327] Example 24: According to the method of Example 22 or 23, wherein:

[0328] • The first DMRS port associated with the first PTRS port is used for PUSCH transmission to the first TRP based on the value of a single PTRS-DMRS association field included in the DCI;

[0329] The second DMRS port associated with the second PTRS port is used for PUSCH transmission to the second TRP based on the value of a single PTRS-DMRS association field included in the DCI.

[0330] Example 25: According to the method of Example 24, wherein:

[0331] • A single PTRS-DMRS association field is a 2-bit field;

[0332] • DCI is used for non-codebook-based PUSCH transmission and also includes a first SRI field and a second SRI field;

[0333] • The most significant bit (MSB) of a single PTRS-DMRS association field is associated with the first SRI field;

[0334] • The least significant bit (LSB) of a single PTRS-DMRS associated field is associated with the second SRI field.

[0335] Example 26: According to the method of Example 24, wherein:

[0336] • A single PTRS-DMRS association field is a 2-bit field;

[0337] • DCI is based on codebook-based PUSCH transmission and also includes a first TPMI field and a second TPMI field;

[0338] • The most significant bit (MSB) of a single PTRS-DMRS association field is associated with the first TPMI field;

[0339] • The least significant bit (LSB) of a single PTRS-DMRS associated field is associated with the second TPMI field.

[0340] Example 27: According to the method of Example 25 or 26, wherein:

[0341] • The maximum rank of PUSCH transmission can be 2 or 4;

[0342] • The MSB of a single PTRS-DMRS association field indicates that one of the first or second DMRS ports indicated in the antenna port field is associated with the first PTRS port for transmission to the PUSCH of the first TRP; and

[0343] • The LSB of the single PTRS-DMRS association field indicates that one of the first and second DMRS ports indicated in the antenna port field is associated with the second PT-RS port for transmission to the PUSCH of the second TRP.

[0344] Example 28: According to the method of Example 25 or 26, wherein:

[0345] • Indicates rank 3 or 4 in DCI;

[0346] • The MSB of a single PTRS-DMRS association field indicates that one of the first and third DMRS ports indicated in the antenna port field is associated with the first PTRS port for PUSCH transmission to the first TRP; and

[0347] • The LSB indicator in the single PTRS-DMRS association field indicates that one of the first and third DMRS ports is associated with the second PT-RS port for transmission to the PUSCH of the second TRP.

[0348] Example 29: According to the method of Example 22 or 23, wherein the wireless communication device (612) is configured with two PTRS ports for each TRP, and:

[0349] • At least one DMRS port associated with at least one PTRS port is used for PUSCH transmission to the first TRP, including:

[0350] The first DMRS port associated with the first PTRS port is used for PUSCH transmission to the first TRP based on the value of a single PTRS-DMRS association field included in the DCI;

[0351] The second DMRS port, associated with the second PTRS port, is used for PUSCH transmission to the first TRP based on the value of a single PTRS-DMRS association field included in the DCI; and

[0352] • At least one DMRS port associated with at least one PTRS port is used for PUSCH transmission to the second TRP, including:

[0353] The third DMRS port, associated with the third PTRS port, is used for PUSCH transmission to the second TRP based on the value of a single PTRS-DMRS association field included in the DCI; and

[0354] The fourth DMRS port, associated with the fourth PTRS port, is used for PUSCH transmission to the second TRP based on the value of a single PTRS-DMRS association field included in the DCI.

[0355] Example 30: According to the method of Example 29, wherein:

[0356] • A single PTRS-DMRS association field is a 2-bit field;

[0357] • The most significant bit (MSB) of a single PTRS-DMRS association field is associated with the first and third PTRS ports;

[0358] • The least significant bit (LSB) of a single PTRS-DMRS association field is associated with the second and fourth PTRS ports.

[0359] Example 31: According to the method of Example 29, wherein:

[0360] • A single PTRS-DMRS association field is a 2-bit field;

[0361] • A single PTRS-DMRS association field is applied only to the first TRP or only to the second TRP.

[0362] Example 32: According to the method of Example 31, wherein the PTRS-DMRS association for another TRP is predefined.

[0363] Example 33: According to the method of Example 29, wherein:

[0364] • A single PTRS-DMRS association field is a 2-bit field;

[0365] • The most significant bit (MSB) of a single PTRS-DMRS associated field indicates:

[0366] The first DMRS port associated with the first PTRS port in the first DMRS port group; and

[0367] The third DMRS port associated with the third PTRS port from the second DMRS port group.

[0368] • The least significant bit (LSB) representation of a single PTRS-DMRS association field:

[0369] The second DMRS port associated with the second PTRS port from the first DMRS port group; and

[0370] The fourth DMRS port associated with the fourth PTRS port in the second DMRS port group.

[0371] Example 34: According to the method of Example 33, the first DMRS port is associated with a first PUSCH or SRS port group, and the second DMRS port is associated with a second PUSCH or SRS port group.

[0372] Example 35: According to the method of Example 21, at least one PTRS-DMRS association field includes a first PTRS-DMRS association field and a second PTRS-DMRS association field.

[0373] Example 36: According to the method of Example 35, each PTRS-DMRS association field in the first and second PTRS-DMRS association fields is a 2-bit field.

[0374] Example 37: According to the method of Example 35 or 36, wherein:

[0375] • At least one DMRS port associated with at least one PTRS port is used to transmit to the PUSCH of the first TRP a value including a first PTRS-DMRS association field included in the DCI; and the first DMRS port associated with the first PTRS port is used to transmit to the PUSCH of the first TRP; and

[0376] • At least one DMRS port associated with at least one PTRS port is used to transmit values ​​including the second PTRS-DMRS association field included in the DCI to the PUSCH of the second TRP, and the second DMRS port associated with the second PTRS port is used to transmit to the PUSCH of the second TRP.

[0377] Example 38: According to the method of Example 35 or 36, wherein the wireless communication device (612) is configured with two PT-RS ports for each TRP, and:

[0378] • At least one DMRS port associated with at least one PTRS port is used for PUSCH transmission to the first TRP, including:

[0379] Based on the value of the first PTRS-DMRS association field included in the DCI, the first DMRS port associated with the first PTRS port is used for PUSCH transmission to the first TRP;

[0380] Based on the value of the first PTRS-DMRS association field included in the DCI, the second DMRS port associated with the second PTRS port is used for PUSCH transmission to the first TRP; and

[0381] • At least one DMRS port associated with at least one PTRS port is used for PUSCH transmission to the second TRP, including:

[0382] Based on the value of the second PTRS-DMRS association field included in the DCI, the third DMRS port associated with the third PTRS port is used for PUSCH transmission to the second TRP; and

[0383] Based on the value of the second PTRS-DMRS association field included in the DCI, the fourth DMRS port associated with the fourth PTRS port is used for PUSCH transmission to the second TRP.

[0384] Example 39: The method according to any one of Examples 21 to 38, wherein each TRP is configured with a PTRS to PUSCH power ratio.

[0385] Example 40: The method according to any of the foregoing embodiments further includes: acquiring user data; and forwarding the user data to a host computer or a wireless communication device.

[0386] Group C Implementation Examples

[0387] Example 41: A wireless communication device includes: processing circuitry configured to perform any step of any embodiment in any of the Group A examples; and power supply circuitry configured to supply power to the wireless communication device.

[0388] Example 42: A base station includes: processing circuitry configured to perform any step of any embodiment in any of the Group B examples; and power supply circuitry configured to supply power to the base station.

[0389] Example 43: A user equipment (UE) includes: an antenna configured to transmit and receive radio signals; a radio front-end circuit connected to the antenna and processing circuitry and configured to modulate signals transmitted between the antenna and processing circuitry; processing circuitry configured to perform any step of any embodiment in any of the Group A examples; an input interface connected to the processing circuitry and configured to allow information to be input to the UE for processing by the processing circuitry; an output interface connected to the processing circuitry and configured to output information already processed by the processing circuitry from the UE; and a battery connected to the processing circuitry and configured to power the UE.

[0390] Example 44: A communication system including a host computer comprising: processing circuitry configured to provide user data; and a communication interface configured to forward the user data to a cellular network for transmission to a user equipment (UE); wherein the cellular network includes a base station having a radio interface and processing circuitry configured to perform any step of any embodiment in any of the Group B examples.

[0391] Example 45: The communication system according to the foregoing embodiments further includes a base station.

[0392] Example 46: The communication system according to the preceding two examples further includes a UE, wherein the UE is configured to communicate with a base station.

[0393] Example 47: A communication system according to the preceding three examples, wherein: the processing circuitry of the host computer is configured to execute a host application to provide user data; and the UE includes processing circuitry configured to execute a client application associated with the host application.

[0394] Example 48: A method implemented in a communication system including a host computer, a base station, and a user equipment (UE), the method comprising: providing user data at the host computer; and initiating a transmission carrying the user data to the UE via a cellular network including the base station at the host computer, wherein the base station performs any step of any embodiment in the Group B examples.

[0395] Example 49: The method according to the foregoing embodiments further includes transmitting user data at the base station.

[0396] Example 50: According to the method of the preceding two examples, wherein user data is provided at the host computer by executing a host application, the method further includes: at the UE, executing a client application associated with the host application.

[0397] Example 51: A user equipment (UE) configured to communicate with a base station, the UE including a radio interface and processing circuitry configured to perform the methods of the preceding three examples.

[0398] Example 52: A communication system including a host computer comprising: processing circuitry configured to provide user data; and a communication interface configured to forward the user data to a cellular network for transmission to a user equipment (UE); wherein the UE includes a radio interface and processing circuitry, and components of the UE are configured to perform any step of any embodiment in any of the Group A examples.

[0399] Example 53: A communication system according to the foregoing embodiments, wherein the cellular network further includes a base station configured to communicate with the UE.

[0400] Example 54: A communication system according to the preceding two examples, wherein: the processing circuit of the host computer is configured to execute a host application to provide user data; and the processing circuit of the UE is configured to execute a client application associated with the host application.

[0401] Example 55: A method implemented in a communication system including a host computer, a base station, and a user equipment (UE), the method comprising: providing user data at the host computer; and initiating a transmission carrying the user data to the UE via a cellular network including the base station at the host computer, wherein the UE performs any step of any embodiment in any of the Group A examples.

[0402] Example 56: The method according to the foregoing embodiments further includes receiving user data from the base station at the UE.

[0403] Example 57: A communication system including a host computer, comprising: a communication interface configured to receive user data transmitted from a user equipment (UE) to a base station; wherein the UE includes a radio interface and processing circuitry, the processing circuitry of the UE being configured to perform any step of any embodiment in any of the Group A examples.

[0404] Example 58: The communication system according to the foregoing embodiments further includes a UE.

[0405] Example 59: The communication system according to the preceding two examples further includes a base station, wherein the base station includes a radio interface and a communication interface configured to communicate with the UE, the communication interface being configured to forward user data carried by transmissions from the UE to the base station to a host computer.

[0406] Example 60: A communication system according to the preceding three examples, wherein: the processing circuit of the host computer is configured to execute a host application; and the processing circuit of the UE is configured to execute a client application associated with the host application, thereby providing user data.

[0407] Example 61: A communication system according to the preceding four examples, wherein: the processing circuit of the host computer is configured to execute a host application to provide requested data; and the processing circuit of the UE is configured to execute a client application associated with the host application to provide user data in response to the requested data.

[0408] Example 62: A method implemented in a communication system including a host computer, a base station, and a user equipment (UE), the method comprising: at the host computer, receiving user data transmitted from the UE to the base station, wherein the UE performs any step of any embodiment in any of the Group A examples.

[0409] Example 63: The method according to the foregoing embodiments further includes providing user data to the base station at the UE.

[0410] Example 64: The method according to the preceding two examples further includes: at the UE, executing a client application to provide user data to be sent; and at the host computer, executing a host application associated with the client application.

[0411] Example 65: The method according to the preceding three examples further includes: executing a client application at the UE; and receiving input data from the client application at the UE, the input data being provided at a host computer by executing a host application associated with the client application; wherein the user data to be sent is provided by the client application in response to the input data.

[0412] Example 66: A communication system including a host computer, the host computer including a communication interface configured to receive user data originating from transmissions from a user equipment (UE) to a base station, wherein the base station includes a radio interface and processing circuitry, the processing circuitry of the base station being configured to perform any step of any embodiment in any of the Group B examples.

[0413] Example 67: The communication system according to the foregoing embodiments further includes a base station.

[0414] Example 68: The communication system according to the preceding two examples further includes a UE, wherein the UE is configured to communicate with a base station.

[0415] Example 69: A communication system according to the preceding three examples, wherein: the processing circuitry of the host computer is configured to execute a host application; and the UE is configured to execute a client application associated with the host application, thereby providing user data to be received by the host computer.

[0416] Example 70: A method performed in a communication system including a host computer, a base station, and a user equipment (UE), the method comprising: at the host computer, receiving from the base station user data transmitted from the base station that has already been received from the UE, wherein the UE performs any step of any embodiment in any of the Group A examples.

[0417] Example 71: The method according to the previous embodiment further includes receiving user data from the UE at the base station.

[0418] Example 72: The method according to the preceding two examples further includes, at the base station, initiating the transmission of the received user data to the host computer.

[0419] Those skilled in the art will recognize improvements and modifications to the embodiments of this disclosure. All such improvements and modifications are considered to be within the scope of the disclosed concepts.

Claims

1. A method performed by a wireless communication device (612), comprising: Receive downlink control information (DCI) from the base station (1104; 1204), where: The DCI is scheduled to repeat the Physical Uplink Shared Channel (PUSCH) to one or two Transmitter / Receiver Points (TRPs), wherein the DCI is configured by the base station with first and second Sounding Reference Signal (SRS) resource sets and the PUSCH is configured by the base station with a maximum rank greater than 2; and The DCI includes: Antenna port field indicating two or more demodulation reference signal (DMRS) ports; The first and second SRS resource indicator (SRI) fields and / or the first and second transmit precoding matrix indicator (TPMI) fields; and Two PTRS-DMRS association fields, a first PTRS-DMRS field and a second PTRS-DMRS field, each PTRS-DMRS field has 2 bits; When the DCI schedules PUSCH duplicates to two TRPs, based on the first PTRS-DMRS association field included in the DCI, at least one DMRS port (1106-1108; 1206-1208) associated with at least one PTRS port is determined for use in transmitting PUSCH to the first TRP, wherein the first TRP is associated with the first SRS resource set. When the DCI schedules PUSCH duplicates to two TRPs, based on the second PTRS-DMRS association field included in the DCI, at least one DMRS port (1110-1112; 1210-1212) associated with at least one PTRS port is determined for use in transmitting PUSCH to the second TRP, wherein the second TRP is associated with the second SRS resource set. When the DCI schedules a PUSCH repeat to the first TRP or the second TRP, if the PUSCH repeat is associated with the first SRI field, then based on the first PTRS-DMRS association field, or if the PUSCH repeat is associated with the second SRI field, then based on the second PTRS-DMRS association field, at least one of the DMRS ports associated with at least one PTRS port is determined for use in PUSCH transmission to the first TRP or the second TRP. The first PUSCH repeat is sent to the first TRP using at least one PTRS port used for PUSCH transmission to the first TRP (1114; 1214); and The second PUSCH repeats (1116; 1216) are sent to the second TRP using the at least one PTRS port used for PUSCH transmission to the second TRP; One of the following: The first PTRS-DMRS association field is associated with the first SRI field in the DCI, and the second TRP is associated with the second PTRS-DMRD association field, which in turn is associated with the second SRI field in the DCI; or The first PTRS-DMRS association field is associated with a first SRS resource set, or the second PTRS-DMRS association field is associated with a second SRS resource set, wherein the first SRS resource set is associated with the first SRI field in the DCI, and the second SRS resource set is associated with the second SRI field in the DCI; or The first PTRS-DMRS association field is associated with the first TPMI field of the DCI, or the second PTRS-DMRS association field is associated with the second TPMI field of the DCI.

2. The method according to claim 1, wherein: The DCI includes the two PTRS-DMRS association fields, namely the first PTRS-DMRS association field and the second PTRS-DMRS field, each PTRS-DMRS field having 2 bits; The first PTRS-DMRS association field is associated with the first TRP; and The second PTRS-DMRS association field is associated with the second TRP; The first TRP is associated with the first SRI field in the DCI, and the second TRP is associated with the second SRI field in the DCI.

3. The method according to claim 1, wherein: The DCI includes the two PTRS-DMRS association fields, namely the first PTRS-DMRS field and the second PTRS-DMRS field, each PTRS-DMRS field having 2 bits; The first PTRS-DMRS association field is associated with the first SRS resource set, and the first SRS resource set is associated with the first TRP; and The second PTRS-DMRS association field is associated with the second SRS resource set, and the second SRS resource set is associated with the second TRP; The first SRS resource set is associated with the first SRI field in the DCI, and the second SRS resource set is associated with the second SRI field in the DCI.

4. The method according to claim 1, wherein: The DCI includes the two PTRS-DMRS association fields, namely the first PTRS-DMRS field and the second PTRS-DMRS field, each field having 2 bits; The DCI is used for non-codebook-based PUSCH transmission and also includes a first SRI field and a second SRI field. The first PTRS-DMRS association field is associated with the first SRI field; and The second PTRS-DMRS association field is associated with the second SRI field.

5. The method according to claim 1, wherein: The DCI includes the two PTRS-DMRS association fields, namely the first PTRS-DMRS field and the second PTRS-DMRS field, each PTRS-DMRS field having 2 bits; The first PTRS-DMRS association field is associated with the first TPMI field of the DCI associated with the first TRP; and The second PTRS-DMRS association field is associated with the second TPMI field of the DCI associated with the second TRP.

6. The method according to claim 1, wherein: The DCI includes the two PTRS-DMRS association fields, namely the first PTRS-DMRS field and the second PTRS-DMRS field, each PTRS-DMRS field having 2 bits; The DCI is used for codebook-based PUSCH transmission and also includes a first TPMI field and a second TPMI field; The first PTRS-DMRS association field is associated with the first TPMI field; and The second PTRS-DMRS association field is associated with the second TPMI field.

7. The method according to any one of claims 1 to 6, wherein: Determine (1106-1108) that the at least one DMRS port associated with the at least one PTRS port is used to transmit to the PUSCH of the first TRP, including the first PTRS-DMRS association field included in the DCI, and determine (1106) that the first DMRS port associated with the first PTRS port is used to transmit to the PUSCH of the first TRP. Determine (1110-1112) that the at least one DMRS port associated with the at least one PTRS port is used to transmit to the PUSCH of the second TRP, including the second PTRS-DMRS association field included in the DCI; determine (1110) that the second DMRS port associated with the second PTRS port is used to transmit to the PUSCH of the second TRP. Sending (1114) the first PUSCH repeat to the first TRP includes sending (1114) the first PUSCH repeat to the first TRP using the first PTRS port associated with the first DMRS port; and Sending (1116) the second PUSCH repeat to the second TRP includes sending (1116) the second PUSCH repeat to the second TRP using the second PTRS port associated with the second DMRS port.

8. The method according to any one of claims 1 to 6, wherein: The first PTRS-DMRS association field indicates that one of the up to four DMRS ports indicated in the antenna port field is associated with the first PTRS port used for PUSCH transmission to the first TRP; and The second PTRS-DMRS association field indicates that one of the up to four DMRS ports indicated in the antenna port field is associated with the first PTRS port used for transmission to the PUSCH of the second TRP.

9. The method according to claim 1, wherein the wireless communication device (612) is configured with two PTRS ports for each TRP, and: Determining (1106-1108) that the at least one DMRS port associated with the at least one PTRS port is used for PUSCH transmission to the first TRP includes: Based on the value of the first PTRS-DMRS association field included in the DCI, it is determined (1106) that the first DMRS port associated with the first PTRS port is used for transmission to the PUSCH of the first TRP; Based on the first PTRS-DMRS association field included in the DCI, it is determined (1108) that the second DMRS port associated with the second PTRS port is used for PUSCH transmission to the first TRP; and Determining (1110-1112) that the at least one DMRS port associated with the at least one PTRS port is used for PUSCH transmission to the second TRP includes: Based on the most significant bit (MSB) of the second PTRS-DMRS association field included in the DCI, it is determined (1110) that the third DMRS port associated with the third PTRS port is used for transmission to the PUSCH of the second TRP; and Based on the value of the second PTRS-DMRS association field included in the DCI, it is determined (1112) that the fourth DMRS port associated with the fourth PTRS port is used for transmission to the PUSCH of the second TRP; Sending (1114) the first PUSCH repeat to the first TRP includes sending (1114) the first PUSCH repeat to the first TRP using the first PTRS port associated with the first DMRS port and the second PTRS port associated with the second DMRS port; and Sending (1116) the second PUSCH repeat to the second TRP includes sending (1116) the second PUSCH repeat to the second TRP using the third PTRS port associated with the third DMRS port and the fourth PTRS port associated with the fourth DMRS port.

10. The method according to claim 9, wherein: The DCI includes the two PTRS-DMRS association fields, namely the first PTRS-DMRS field and the second PTRS-DMRS field, each PTRS-DMRS field having 2 bits; The MSB indication of the first PTRS-DMRS association field: The first DMRS port associated with the first PTRS port from the first DMRS port group; The least significant bit (LSB) of the first PTRS-DMRS association field indicates: The second DMRS port associated with the second PTRS port from the second DMRS port group; The MSB indication of the second PTRS-DMRS association field: The third DMRS port associated with the third PTRS port from the first DMRS port group; The LSB indication of the second PTRS-DMRS association field: The fourth DMRS port, which is associated with the fourth PTRS port, from the second DMRS port group.

11. The method of claim 10, wherein the first DMRS port is associated with a first PUSCH or a shared PT-RS port 0 SRS port group, and the second DMRS port is associated with a second PUSCH or a shared PT-RS port 1 SRS port group.

12. A wireless communication device, suitable for: Receive downlink control information (DCI) from the base station (1104; 1204), where: The DCI is scheduled to repeat the Physical Uplink Shared Channel (PUSCH) to one or two Transmit / Receive Points (TRPs), wherein the DCI is configured by the base station with first and second Sounding Reference Signal (SRS) resource sets and the PUSCH is configured by the base station with a maximum rank greater than 2. and The DCI includes: Antenna port field indicating two or more demodulation reference signal (DMRS) ports; The first and second SRS resource indicator (SRI) fields and / or the first and second transmit precoding matrix indicator (TPMI) fields; and Two PTRS-DMRS association fields, a first PTRS-DMRS field and a second PTRS-DMRS field, each PTRS-DMRS field has 2 bits; When the DCI schedules PUSCH duplicates to two TRPs, based on the first PTRS-DMRS association field included in the DCI, at least one DMRS port (1106-1108; 1206-1208) associated with at least one PTRS port is determined for use in transmitting PUSCH to the first TRP, wherein the first TRP is associated with the first SRS resource set. When the DCI schedules PUSCH duplicates to two TRPs, based on the second PTRS-DMRS association field included in the DCI, at least one DMRS port (1110-1112; 1210-1212) associated with at least one PTRS port is determined for use in transmitting PUSCH to the second TRP, wherein the second TRP is associated with the second SRS resource set. When the DCI schedules a PUSCH repeat to the first TRP or the second TRP, if the PUSCH repeat is associated with the first SRI field, then based on the first PTRS-DMRS association field, or if the PUSCH repeat is associated with the second SRI field, then based on the second PTRS-DMRS association field, at least one of the DMRS ports associated with at least one PTRS port is determined for use in PUSCH transmission to the first TRP or the second TRP. The first PUSCH repeat is sent to the first TRP using at least one PTRS port used for PUSCH transmission to the first TRP (1114; 1214); and The second PUSCH repeats (1116; 1216) are sent to the second TRP using the at least one PTRS port used for PUSCH transmission to the second TRP; One of the following: The first PTRS-DMRS association field is associated with the first SRI field in the DCI, and the second TRP is associated with the second PTRS-DMRD association field, which is related to the DCI. The second SRI field in the data is associated with it; or The first PTRS-DMRS association field is associated with a first SRS resource set, and the second PTRS-DMRS association field is associated with a second SRS resource set, wherein the first SRS resource set is associated with the first SRI field in the DCI, and the second SRS resource set is associated with the second SRI field in the DCI; or The first PTRS-DMRS association field is associated with the first TPMI field of the DCI, and the second PTRS-DMRS association field is associated with the second TPMI field of the DCI.

13. The wireless communication device according to claim 12 is also suitable for performing the method according to any one of claims 2 to 11.

14. A wireless communication device, comprising: One or more transmitters; One or more receivers; as well as Processing circuitry associated with the one or more transmitters and the one or more receivers, the processing circuitry being configured to cause the wireless communication device to: Receive downlink control information (DCI) from the base station (1104; 1204), where: The DCI is scheduled to repeat the Physical Uplink Shared Channel (PUSCH) to one or two Transmitter / Receiver Points (TRPs), wherein the DCI is configured by the base station with first and second Sounding Reference Signal (SRS) resource sets and the PUSCH is configured by the base station with a maximum rank greater than 2; and The DCI includes: Antenna port field indicating two or more demodulation reference signal (DMRS) ports; The first and second SRS resource indicator (SRI) fields and / or the first and second transmit precoding matrix indicator (TPMI) fields; and Two PTRS-DMRS association fields, a first PTRS-DMRS field and a second PTRS-DMRS field, each PTRS-DMRS field has 2 bits; When the DCI schedules PUSCH duplicates to two TRPs, based on the value of the first PTRS-DMRS association field included in the DCI, at least one DMRS port (1106-1108; 1206-1208) associated with at least one PTRS port is determined for use in transmitting PUSCH to the first TRP, wherein the first TRP is associated with the first SRS resource set. When the DCI schedules PUSCH duplicates to two TRPs, based on the value of the second PTRS-DMRS association field included in the DCI, at least one DMRS port (1110-1112; 1210-1212) associated with at least one PTRS port is determined for use in PUSCH transmission to the second TRP, wherein the second TRP is associated with the second SRS resource set. When the DCI schedules a PUSCH repeat to the first or second TRP, if the PUSCH repeat is associated with the first SRI field, then based on the first PTRS-DMRS association field, or if the PUSCH repeat is associated with the second SRI field, then based on the second PTRS-DMRS association field, at least one of the DMRS ports associated with at least one PTRS port is determined for PUSCH transmission to the first or second TRP; a first PUSCH repeat (1114; 1214) is sent to the first TRP using the at least one PTRS port used for PUSCH transmission to the first TRP; and The second PUSCH repeats (1116; 1216) are sent to the second TRP using the at least one PTRS port used for PUSCH transmission to the second TRP; One of the following: The first PTRS-DMRS association field is associated with the first SRI field in the DCI, and the second TRP is associated with the second PTRS-DMRD association field, which in turn is associated with the second SRI field in the DCI; or The first PTRS-DMRS association field is associated with a first SRS resource set, and the second PTRS-DMRS association field is associated with a second SRS resource set, wherein the first SRS resource set is associated with the first SRI field in the DCI, and the second SRS resource set is associated with the second SRI field in the DCI; or The first PTRS-DMRS association field is associated with the first TPMI field of the DCI, and the second PTRS-DMRS association field is associated with the second TPMI field of the DCI.

15. The wireless communication device of claim 14, wherein the processing circuitry is further configured to cause the wireless communication device to perform the method of any one of claims 2 to 11.

16. A method performed by a wireless communication device (612), comprising: Receive downlink control information (DCI) from the base station (1104; 1204), where: The DCI schedules repeated Physical Uplink Shared Channel (PUSCH) to the two transmit / receive points TRP; and The DCI includes: Antenna port field indicating two or more demodulation reference signal (DMRS) ports; and The phase tracking reference signal and demodulation reference signal PTRS-DMRS association field, wherein the PTRS-DMRS association field is a 2-bit field; Based on the value of the most significant bit (MSB) of the PTRS-DMRS association field included in the DCI, at least one DMRS port (1106-1108; 1206-1208) associated with at least one PTRS port is determined to be used for transmission to the PUSCH of the first TRP. Based on the value of the least significant bit (LSB) of the PTRS-DMRS association field included in the DCI, at least one DMRS port (1110-1112; 1210-1212) associated with at least one PTRS port is determined to be used for PUSCH transmission to the second TRP. The first PUSCH repeat is sent to the first TRP using at least one PTRS port used for PUSCH transmission to the first TRP (1114; 1214); and The second PUSCH repeats (1116; 1216) are sent to the second TRP using the at least one PTRS port used for PUSCH transmission to the first TRP; One of the following: The MSB of the PTRS-DMRS association field is associated with the first TRP, and the LSB of the PTRS-DMRS association field is associated with the second TRP, wherein the first TRP is associated with the first Sounding Reference Signal SRS Resource Indicator (SRI) field in the DCI, and the second TRP is associated with the second SRI field in the DCI; or The MSB of the PTRS-DMRS association field is associated with a first SRS resource set, which is associated with a first TRP, and the LSB of the PTRS-DMRS association field is associated with a second SRS resource set, which is associated with a second TRP, wherein the first SRS resource set is associated with the first SRI field in the DCI, and the second SRS resource set is associated with the second SRI field in the DCI; or The MSB of the PTRS-DMRS association field is associated with the first transmit precoding matrix indicator (TPMI) field of the DCI, which is associated with the first TRP, and the LSB of the PTRS-DMRS association field is associated with the second TPMI field of the DCI, which is associated with the second TRP.

17. A method performed by a wireless communication device, comprising: Receive downlink control information (DCI) from the base station (1104; 1204), where: The DCI schedules repeated Physical Uplink Shared Channel (PUSCH) to the two transmit / receive points TRP; and The DCI includes: Antenna port field indicating two or more demodulation reference signal (DMRS) ports; and The first phase tracking reference signal and demodulation reference signal PTRS-DMRS association field and the second PTRS-DMRS association field, each PTRS-DMRS association field is a 2-bit field; Based on the value of at least one PTRS-DMRS association field included in the DCI, determine (1106-1108; 1206-1208) at least one DMRS port associated with at least one PTRS port for transmission to the PUSCH of the first TRP; Based on the value of the at least one PTRS-DMRS association field included in the DCI, determine (1110-1112; 1210-1212) at least one DMRS port associated with at least one PTRS port for transmission to the PUSCH of the second TRP; The first PUSCH repeat is sent to the first TRP using at least one PTRS port used for PUSCH transmission to the first TRP (1114; 1214); and The second PUSCH repeats (1116; 1216) are sent to the second TRP using the at least one PTRS port used for PUSCH transmission to the second TRP; One of the following: The maximum rank is 4. The first PTRS-DMRS association field is associated with the first SRS resource set, the first SRS resource set is associated with the first TRP, and the second PTRS-DMRS association field is associated with the second SRS resource set, the second SRS resource set is associated with the second TRP; or The first PTRS-DMRS association field is associated with the first Transmit Precoding Matrix Indicator (TPMI) field in the DCI, the first TPMI field is associated with the first TRP, and the second PTRS-DMRS association field is associated with the second TPMI field in the DCI, the second TPMI field is associated with the second TRP; or Each TRP is configured with two PT-RS ports, the maximum rank is 4, the first PTRS-DMRS association field is associated with the first SRS resource set, the second PTRS-DMRS association field is associated with the second SRS resource set, the first SRS resource set is associated with the first SRS resource indicator (SRI) field in the DCI, the first SRI field is associated with the first TRP, and the second SRS resource set is associated with the second SRI field in the DCI, the second SRI field is associated with the second TRP.

18. The method of claim 17, wherein the maximum rank is 4, the first PTRS-DMRS association field is associated with the first SRS resource set, the first SRS resource set is associated with the first TRP, and the second PTRS-DMRS association field is associated with the second SRS resource set, the second SRS resource set is associated with the second TRP.

19. The method of claim 17, wherein the first PTRS-DMRS association field is associated with the first TPMI field in the DCI, the first TPMI field is associated with the first TRP, and the second PTRS-DMRS association field is associated with the second TPMI field in the DCI, the second TPMI field is associated with the second TRP.

20. The method of claim 17, wherein each TRP is configured with two PT-RS ports, the maximum rank is 4, the first PTRS-DMRS association field is associated with the first SRS resource set, the second PTRS-DMRS association field is associated with the second SRS resource set, the first SRS resource set is associated with the first SRI field in the DCI, the first SRI field is associated with the first TRP, and the second SRS resource set is associated with the second SRI field in the DCI, the second SRI field is associated with the second TRP.

21. The method according to any one of claims 1 to 20, wherein the PT-RS to PUSCH power ratio is configured for each TRP.

22. A wireless communication device, suitable for: Receive downlink control information (DCI) from the base station (1104; 1204), where: The DCI schedules repeated Physical Uplink Shared Channel (PUSCH) to the two transmit / receive points TRP. and The DCI includes: Antenna port field indicating two or more demodulation reference signal (DMRS) ports; and The first phase tracking reference signal and demodulation reference signal PTRS-DMRS association field and the second PTRS-DMRS association field, each PTRS-DMRS association field is a 2-bit field; Based on the value of at least one PTRS-DMRS association field included in the DCI, determine (1106-1108; 1206-1208) at least one DMRS port associated with at least one PTRS port for transmission to the PUSCH of the first TRP; Based on the value of the at least one PTRS-DMRS association field included in the DCI, determine (1110-1112; 1210-1212) at least one DMRS port associated with at least one PTRS port for transmission to the PUSCH of the second TRP; The first PUSCH repeat is sent to the first TRP using at least one PTRS port used for PUSCH transmission to the first TRP (1114; 1214); and The second PUSCH repeats (1116; 1216) are sent to the second TRP using the at least one PTRS port used for PUSCH transmission to the first TRP; One of the following: The maximum rank is 4. The first PTRS-DMRS association field is associated with the first SRS resource set, the first SRS resource set is associated with the first TRP, and the second PTRS-DMRS association field is associated with the second SRS resource set, the second SRS resource set is associated with the second TRP; or The first PTRS-DMRS association field is associated with the first Transmit Precoding Matrix Indicator (TPMI) field in the DCI, the first TPMI field is associated with the first TRP, and the second PTRS-DMRS association field is associated with the second TPMI field in the DCI, the second TPMI field is associated with the second TRP; or Each TRP is configured with two PT-RS ports, the maximum rank is 4, the first PTRS-DMRS association field is associated with the first SRS resource set, the second PTRS-DMRS association field is associated with the second SRS resource set, the first SRS resource set is associated with the first SRS resource indicator (SRI) field in the DCI, the first SRI field is associated with the first TRP, and the second SRS resource set is associated with the second SRI field in the DCI, the second SRI field is associated with the second TRP.

23. The wireless communication device according to claim 22 is also suitable for performing the method according to any one of claims 18 to 21.

24. A wireless communication device, comprising: One or more transmitters; One or more receivers; as well as Processing circuitry associated with the one or more transmitters and the one or more receivers, the processing circuitry being configured to cause the wireless communication device to: Receive downlink control information (DCI) from the base station (1104; 1204), where: The DCI schedules repeated Physical Uplink Shared Channel (PUSCH) to the two transmit / receive points TRP; and The DCI includes: Antenna port field indicating two or more demodulation reference signal (DMRS) ports; and The first phase tracking reference signal and demodulation reference signal PTRS-DMRS association field and the second PTRS-DMRS association field, each PTRS-DMRS association field is a 2-bit field; Based on the value of at least one PTRS-DMRS association field included in the DCI, determine (1106-1108; 1206-1208) at least one DMRS port associated with at least one PTRS port for transmission to the PUSCH of the first TRP; Based on the value of the at least one PTRS-DMRS association field included in the DCI, determine (1110-1112; 1210-1212) at least one DMRS port associated with at least one PTRS port for transmission to the PUSCH of the second TRP; The first PUSCH repeat is sent to the first TRP using at least one PTRS port used for PUSCH transmission to the first TRP (1114; 1214); and The second PUSCH repeats (1116; 1216) are sent to the second TRP using the at least one PTRS port used for PUSCH transmission to the first TRP; One of the following: The maximum rank is 4. The first PTRS-DMRS association field is associated with the first SRS resource set, the first SRS resource set is associated with the first TRP, and the second PTRS-DMRS association field is associated with the second SRS resource set, the second SRS resource set is associated with the second TRP; or The first PTRS-DMRS association field is associated with the first Transmit Precoding Matrix Indicator (TPMI) field in the DCI, the first TPMI field is associated with the first TRP, and the second PTRS-DMRS association field is associated with the second TPMI field in the DCI, the second TPMI field is associated with the second TRP; or Each TRP is configured with two PT-RS ports, the maximum rank is 4, the first PTRS-DMRS association field is associated with the first SRS resource set, the second PTRS-DMRS association field is associated with the second SRS resource set, the first SRS resource set is associated with the first SRS resource indicator (SRI) field in the DCI, the first SRI field is associated with the first TRP, and the second SRS resource set is associated with the second SRI field in the DCI, the second SRI field is associated with the second TRP.

25. The wireless communication device according to claim 24 is also suitable for performing the method according to any one of claims 18 to 21.

26. A method performed by a base station, comprising: Send downlink control information (DCI) (1104; 1204) to the wireless communication device, where: The DCI schedules repeated Physical Uplink Shared Channel (PUSCH) to the two transmit / receive points TRP; and The DCI includes: Antenna port field indicating two or more demodulation reference signal (DMRS) ports; and The phase tracking reference signal and demodulation reference signal PTRS-DMRS association field, wherein the PTRS-DMRS association field is a 2-bit field; One of the following: The most significant bit (MSB) of the PTRS-DMRS association field is associated with the first TRP, and the least significant bit (LSB) of the PTRS-DMRS association field is associated with the second TRP, wherein the first TRP is associated with the first probe reference signal SRS resource indicator (SRI) field in the DCI, and the second TRP is associated with the second SRI field in the DCI; or The MSB of the PTRS-DMRS association field is associated with a first SRS resource set, which is associated with a first TRP, and the LSB of the PTRS-DMRS association field is associated with a second SRS resource set, which is associated with a second TRP, wherein the first SRS resource set is associated with the first SRI field in the DCI, and the second SRS resource set is associated with the second SRI field in the DCI; or The MSB of the PTRS-DMRS association field is associated with the first transmit precoding matrix indicator (TPMI) field of the DCI, which is associated with the first TRP, and the LSB of the PTRS-DMRS association field is associated with the second TPMI field of the DCI, which is associated with the second TRP.

27. A base station, applicable to: Send downlink control information (DCI) (1104; 1204) to the wireless communication device, where: The DCI schedules repeated Physical Uplink Shared Channel (PUSCH) to the two transmit / receive points TRP; and The DCI includes: Antenna port field indicating two or more demodulation reference signal (DMRS) ports; and The phase tracking reference signal and demodulation reference signal PTRS-DMRS association field, wherein the PTRS-DMRS association field is a 2-bit field; One of the following: The most significant bit (MSB) of the PTRS-DMRS association field is associated with the first TRP, and the least significant bit (LSB) of the PTRS-DMRS association field is associated with the second TRP, wherein the first TRP is associated with the first probe reference signal SRS resource indicator (SRI) field in the DCI, and the second TRP is associated with the second SRI field in the DCI; or The MSB of the PTRS-DMRS association field is associated with a first SRS resource set, which is associated with a first TRP, and the LSB of the PTRS-DMRS association field is associated with a second SRS resource set, which is associated with a second TRP, wherein the first SRS resource set is associated with the first SRI field in the DCI, and the second SRS resource set is associated with the second SRI field in the DCI; or The MSB of the PTRS-DMRS association field is associated with the first transmit precoding matrix indicator (TPMI) field of the DCI, which is associated with the first TRP, and the LSB of the PTRS-DMRS association field is associated with the second TPMI field of the DCI, which is associated with the second TRP.

28. A base station, including processing circuitry, the processing circuitry being configured to cause the base station to: Send downlink control information (DCI) (1104; 1204) to the wireless communication device, where: The DCI schedules repeated Physical Uplink Shared Channel (PUSCH) to the two transmit / receive points TRP; and The DCI includes: Antenna port field indicating two or more demodulation reference signal (DMRS) ports; and The phase tracking reference signal and demodulation reference signal PTRS-DMRS association field, wherein the PTRS-DMRS association field is a 2-bit field; One of the following: The most significant bit (MSB) of the PTRS-DMRS association field is associated with the first TRP, and the least significant bit (LSB) of the PTRS-DMRS association field is associated with the second TRP, wherein the first TRP is associated with the first probe reference signal SRS resource indicator (SRI) field in the DCI, and the second TRP is associated with the second SRI field in the DCI; or The MSB of the PTRS-DMRS association field is associated with a first SRS resource set, which is associated with a first TRP, and the LSB of the PTRS-DMRS association field is associated with a second SRS resource set, which is associated with a second TRP, wherein the first SRS resource set is associated with the first SRI field in the DCI, and the second SRS resource set is associated with the second SRI field in the DCI; or The MSB of the PTRS-DMRS association field is associated with the first transmit precoding matrix indicator (TPMI) field of the DCI, which is associated with the first TRP, and the LSB of the PTRS-DMRS association field is associated with the second TPMI field of the DCI, which is associated with the second TRP.

29. A method performed by a base station, comprising: Receive (1104; 1204) downlink control information (DCI) from the wireless communication device, where: The DCI schedules repeated Physical Uplink Shared Channel (PUSCH) to the two transmit / receive points TRP; and The DCI includes: Antenna port field indicating two or more demodulation reference signal (DMRS) ports; and The first phase tracking reference signal and demodulation reference signal PTRS-DMRS association field and the second PTRS-DMRS association field, each PTRS-DMRS association field is a 2-bit field; One of the following: The maximum rank is 4. The first PTRS-DMRS association field is associated with the first SRS resource set, the first SRS resource set is associated with the first TRP, and the second PTRS-DMRS association field is associated with the second SRS resource set, the second SRS resource set is associated with the second TRP; or The first PTRS-DMRS association field is associated with the first Transmit Precoding Matrix Indicator (TPMI) field in the DCI, the first TPMI field is associated with the first TRP, and the second PTRS-DMRS association field is associated with the second TPMI field in the DCI, the second TPMI field is associated with the second TRP; or Each TRP is configured with two PT-RS ports, the maximum rank is 4, the first PTRS-DMRS association field is associated with the first SRS resource set, the second PTRS-DMRS association field is associated with the second SRS resource set, the first SRS resource set is associated with the first SRS resource indicator (SRI) field in the DCI, the first SRI field is associated with the first TRP, and the second SRS resource set is associated with the second SRI field in the DCI, the second SRI field is associated with the second TRP.

30. A base station, applicable to: Receive (1104; 1204) downlink control information (DCI) from the wireless communication device, where: The DCI schedules repeated Physical Uplink Shared Channel (PUSCH) to the two transmit / receive points TRP. and The DCI includes: Antenna port field indicating two or more demodulation reference signal (DMRS) ports; and The first phase tracking reference signal and demodulation reference signal PTRS-DMRS association field and the second PTRS-DMRS association field, each PTRS-DMRS association field is a 2-bit field; One of the following: The maximum rank is 4. The first PTRS-DMRS association field is associated with the first SRS resource set, the first SRS resource set is associated with the first TRP, and the second PTRS-DMRS association field is associated with the second SRS resource set, the second SRS resource set is associated with the second TRP; or The first PTRS-DMRS association field is associated with the first Transmit Precoding Matrix Indicator (TPMI) field in the DCI, the first TPMI field is associated with the first TRP, and the second PTRS-DMRS association field is associated with the second TPMI field in the DCI, the second TPMI field is associated with the second TRP; or Each TRP is configured with two PT-RS ports, the maximum rank is 4, the first PTRS-DMRS association field is associated with the first SRS resource set, the second PTRS-DMRS association field is associated with the second SRS resource set, the first SRS resource set is associated with the first SRS resource indicator (SRI) field in the DCI, the first SRI field is associated with the first TRP, and the second SRS resource set is associated with the second SRI field in the DCI, the second SRI field is associated with the second TRP.

31. A base station, including processing circuitry, the processing circuitry being configured to cause the base station to: Receive (1104; 1204) downlink control information (DCI) from the wireless communication device, where: The DCI schedules repeated Physical Uplink Shared Channel (PUSCH) to the two transmit / receive points TRP. and The DCI includes: Antenna port field indicating two or more demodulation reference signal (DMRS) ports; and The first phase tracking reference signal and demodulation reference signal PTRS-DMRS association field and the second PTRS-DMRS association field, each PTRS-DMRS association field is a 2-bit field; One of the following: The maximum rank is 4. The first PTRS-DMRS association field is associated with the first SRS resource set, the first SRS resource set is associated with the first TRP, and the second PTRS-DMRS association field is associated with the second SRS resource set, the second SRS resource set is associated with the second TRP; or The first PTRS-DMRS association field is associated with the first Transmit Precoding Matrix Indicator (TPMI) field in the DCI, the first TPMI field is associated with the first TRP, and the second PTRS-DMRS association field is associated with the second TPMI field in the DCI, the second TPMI field is associated with the second TRP; or Each TRP is configured with two PT-RS ports, the maximum rank is 4, the first PTRS-DMRS association field is associated with the first SRS resource set, the second PTRS-DMRS association field is associated with the second SRS resource set, the first SRS resource set is associated with the first SRS resource indicator (SRI) field in the DCI, the first SRI field is associated with the first TRP, and the second SRS resource set is associated with the second SRI field in the DCI, the second SRI field is associated with the second TRP.

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