PT-RS for PUSCH transmission to multiple TRPs

Abstract

In one embodiment, a method performed by a wireless device comprises receiving downlink control information (DCI) scheduling physical uplink shared channel (PUSCH) repetitions to a transmission / reception point (TRP), the PUSCH being configured with a maximum rank greater than two. The DCI comprises an antenna port field indicating two or more demodulation reference signal (DMRS) ports and either a single PTRS-DMRS association field or two PTRS-DMRS association fields. The method further comprises determining a DMRS port associated with a phase tracking reference signal (PTRS) port for a PUSCH transmission to a first TRP based on either a most significant bit (MSB) of the single PTRS-DMRS association field or a first PTRS-DMRS association field, and determining a DMRS port associated with a PTRS port for a PUSCH transmission to a second TRP based on either a least significant bit (LSB) of the single PTRS-DMRS association field or a second PTRS-DMRS association field.

Description

[Technical Field]

[0001] [Related Applications] This application claims the benefit of Provisional Patent Application No. 63 / 170,023, filed April 2, 2021, the disclosure of which is incorporated herein by reference in its entirety.

[0002] [Technical field] The present disclosure relates to cellular communication systems, such as, for example, 3rd Generation Partnership Project (3GPP®) 5th Generation Systems (5GS), and more particularly, to phase-tracking reference signals (PT-RS) for physical uplink shared channel (PUSCH) transmissions. [Background technology]

[0003] 1 New Radio (NR) Frame Structure and Resource Grid The 3rd Generation Partnership Project (3GPP®) New Radio (NR) uses cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) in both the downlink (i.e., from the network node, gNB, or base station to the user equipment or UE) and uplink (i.e., from the UE to the gNB). Discrete Fourier transform (DFT) spread orthogonal frequency division multiplexing (OFDM) is also supported on the uplink. In the time domain, the NR downlink and uplink are organized into equal-sized subframes of 1 millisecond (ms) each. The subframes are further divided into multiple slots of equal duration. The slot length depends on the subcarrier spacing. For a subcarrier spacing of Δf = 15 kilohertz (kHz), there is only one slot per subframe, and each slot consists of 14 OFDM symbols. Figure 1 shows the NR time domain structure with a subcarrier spacing of 15 kHz.

[0004] Data scheduling in NR is typically slot-based, an example is shown in FIG. 1 with a 14-symbol slot, where the first two symbols contain the physical downlink control channel (PDCCH) and the rest contain the physical shared data channel, either the physical downlink shared channel (PDSCH) or the physical uplink shared channel (PUSCH).

[0005] In NR, different subcarrier spacing values ​​are supported. The supported subcarrier spacing values ​​(also called different numerologies) are Δf = (15 × 2 μ ) kHz, where μ∈0,1,2,3,4. Δf=15 kHz is the basic subcarrier spacing. The slot duration at different subcarrier spacings is 1 / 2 μ is given by ms.

[0006] In the frequency domain, the system bandwidth is divided into resource blocks (RBs), each corresponding to 12 consecutive subcarriers. RBs are numbered starting with 0 at one end of the system bandwidth. The basic NR physical time-frequency resource grid is shown in Figure 2, where only one RB in a 14-symbol slot is shown. One OFDM subcarrier in one OFDM symbol interval forms one resource element (RE).

[0007] Uplink (UL) transmissions may be dynamically scheduled by uplink grants in downlink control information (DCI) carried by the physical downlink control channel (PDCCH).

[0008] 2. PUSCH Transmission Method In NR, there are two transmission schemes specified for the PUSCH: codebook-based and non-codebook-based.

[0009] 2.1 Codebook-based PUSCH If the higher layer parameter txConfig=Codebook, the codebook-based PUSCH is enabled. For dynamically scheduled PUSCH and configured grant PUSCH type 2, the codebook-based PUSCH transmission scheme can be summarized as follows: The UE transmits a sounding reference signal (SRS) configured on an SRS resource set with the upper layer parameter usage set to "CodeBook". Note that only a single SRS resource set can be configured with usage set to "CodeBook". Up to two SRS resources, each with up to four antenna ports, can be configured in an SRS resource set. The gNB determines the number of layers (or rank) and preferred precoder (i.e., transmit precoding matrix indicator (TPMI)) from the codebook subset based on the received SRS from one of the SRS resources. The gNB indicates the selected SRS resource via a 1-bit "SRS Resource Indicator" (SRI) field in the DCI scheduling the PUSCH if two SRS resources are configured in the SRS resource set. If only one SRS resource is configured in the SRS resource set, the "SRS Resource Indicator" field is not present in the DCI. The gNB also indicates the preferred TPMI and the associated layer number of the PUSCH associated with the indicated SRS resource. The UE performs PUSCH transmission using the TPMI and the number of layers indicated on the SRS antenna port. The demodulation reference signal (DMRS) ports associated with the layer are indicated in the “antenna ports” field in the DCI, along with several code division multiplexing (CDM) groups without data.

[0010] The codebook subset is fully and partially and non-coherent (fullyAndPartialAndNonCoherent) Partial and Non-Coherent Non-coherent or the like, and is set based on the UE's reported capabilities.

[0011] In NR, antenna ports are defined such that the channel carrying a symbol on an antenna port can be estimated from the channel carrying other symbols on the same antenna port. In the uplink, DMRS antenna ports for PUSCH start with 0 and SRS, and PUSCH antenna ports start with 1000.

[0012] 2.2 Non-codebook-based PUSCH Non-codebook-based PUSCH transmission is for reciprocity-based UL transmission, and SRS precoding is derived at the UE based on the configured downlink (DL) channel state information reference signal (CSI-RS). From the DL CSI-RS, the UE can measure and estimate appropriate precoder weights for SRS transmission, resulting in one or more (virtual) SRS ports, each corresponding to a spatial layer. The UE can configure up to four SRS resources, each with a single (virtual) SRS port, in an SRS resource set. The UE can transmit SRS on up to four SRS resources, and the gNB measures the UL channel based on the received SRS and determines the preferred SRS resource. The gNB then indicates the selected SRS resource via an SRS resource indicator (SRI). Note that only a single SRS resource set with a "non-codebook" configured use may be configured.

[0013] 3 PUSCH demodulation reference signal (DMRS or DM-RS) The DMRS is used for PUSCH demodulation and is limited to the resource blocks allocated to the PUSCH.

[0014] The mapping of DMRS to resource elements is configurable in both the frequency domain and the time domain. In the frequency domain, there are two mapping types, namely Type 1 or Type 2, configured by the higher layer parameter dmrs-Type in DMRS-UplinkConfig.

[0015] DMRS mapping in the time domain can be either single-symbol or two-symbol based, meaning that the DMRS is mapped on two adjacent symbol pairs. Furthermore, a UE can be configured with one, two, three, or four single-symbol DMRSs and one or two double-symbol DMRSs.

[0016] Figure 3 shows examples of Type 1 and Type 2 DMRS with single-symbol DMRS. Type 1 and Type 2 differ in both mapping structure and number of supported DMRS CDM groups, with Type 1 supporting two CDM groups and Type 2 supporting three CDM groups.

[0017] A DMRS antenna port is mapped to resource elements in only one CDM group. For single-symbol DMRS, two antenna ports can be mapped to each CDM group.

[0018] Phase Tracking Reference Signal (PTRS or PT-RS) for PUSCH in 4 NR In NR, a phase tracking reference signal (PT-RS) may be configured for PUSCH transmission to correct errors associated with phase noise for the receiver. The PT-RS may be configured using the upper layer parameter PTRS-UplinkConfig in DMRS-UplinkConfig for PUSCH scheduled by DCI format 0_1 ​​or DCI format 0_2.

[0019] In NR Release 15, for CP-OFDM-based waveforms, either one or two PT-RS ports for the PUSCH are supported, with each PT-RS port associated with one of the DMRS ports of the PUSCH.

[0020] When more than one DMRS port is scheduled, i.e., in the case of multi-layer MIMO transmission of the PUSCH, it is desirable from a performance standpoint if the PT-RS is transmitted on the layer with the highest signal-to-interference-and-noise ratio (SINR). This maximizes phase tracking performance. The network knows which layer has the best SINR based on measurements on the multi-port SRS. Therefore, when scheduling the PUSCH from the UE, the network can indicate on which layer the UE should transmit the PT-RS. This is signaled using the PTRS-DMRS association, as defined by the following table:

[0021] The maximum number of configured PT-RS ports is given by the higher layer parameter maxNrofPorts in PTRS-UplinkConfig, based on the UE's reported need. If the UE reports the ability to support fully coherent UL transmission, it is expected that one PT-RS port will be configured as needed.

[0022] In the frequency domain, for CP-OFDM-based waveforms, the PT-RS can be in at most one subcarrier per two PRBs. The subcarrier used for the PT-RS port must also be one of the subcarriers used for the DMRS port associated with the PT-RS port. 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 a 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 3GPP TS 38.211v16.4.0).

[0023] 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 every OFDM symbol, every two OFDM symbols, or every four OFDM symbols in a slot, respectively. The modulation symbols used for the PT-RS are the same as those for the associated DM-RS in the same subcarrier.

[0024] A PT-RS, eg, CP-OFDM based waveform, is shown in FIG. 4, where the PT-RS port is associated with DM-RS port 0 and has a subcarrier offset of 4 and a time density of 2.

[0025] For codebook or non-codebook based UL transmission, the association between UL PT-RS ports and DM-RS ports is signaled by the "PTRS-DMRS Association" field in DCI Format 0_1 ​​and DCI Format 0_2.

[0026] If a UE is configured with one 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 TS 38.212, reproduced below. As mentioned above, the objective is to schedule the PT-RS to be transmitted on the strongest layer / DMRS port (as there is one DMRS port per layer). For non-codebook-based UL transmission, the actual number of PT-RS ports to transmit from is determined based on the SRI for DCI Format 0_1 ​​and DCI Format 0_2. The UE is configured with a PT-RS port index for each configured SRS resource by the higher layer parameter ptrs-PortIndex configured by SRS-Config. If the PT-RS port indexes associated with different SRIs are the same, the corresponding UL DM-RS ports are associated with the same PT-RS port.

[0027] For partially coherent and non-coherent codebook based UL transmission, the actual number of UL PT-RS ports is determined based on the TPMI and / or number of layers indicated by the "Precoding Information and Number of Layers" field in DCI Format 0_1 ​​and DCI Format 0_2. When a UE is configured with two PT-RS ports, the actual PT-RS ports and associated transmission layers are derived from the TPMI as shown below:

[0028] 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. PT-RS port 0 is associated with a DM-RS port transmitted on PUSCH antenna port 1000 and PUSCH antenna port 1002 as indicated in the TPMI, PT-RS port 1 is associated with another DM-RS port transmitted on PUSCH antenna port 1001 and PUSCH antenna port 1003 as indicated in the TPMI, and 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 TS 38.212, reproduced below: TIFF0007813811000002.tif36164

[0029] 5 NR Release 17 Extensions for PUSCH Transmission to Two TRPs It has been agreed that NR Release 17 will support PUSCH repetitions to two transmission / reception points (TRPs). For this purpose, two SRS resource sets with usage configured as either "codebook" or "non-codebook" are introduced, and each SRS resource set is associated with a TRP. PUSCH repetitions for the 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.

[0030] FIG. 5 shows an example in which PUSCH repetitions for two TRPs are scheduled by DCI indicating two SRI fields.

[0031] To support PT-RS to DM-RS association for each TRP, it was agreed in the 3GPP® RAN1#104e meeting to reuse the same two bits in the "PTRS-DMRS Association" field in DCI Format 0_1 ​​and DCI Format 0_2 with one bit for each TRP. "Agree" For single DCI based M-TRP PUSCH Type B repetition scheme, · For maxRank=2, the number of bits for indicating PTRS-DMRS association is the same as in Release 15 / 16, where MSB and LSB indicate the association between PTRS and DMRS ports for the two TRPs separately. FFS: Indication of PTRS-DMRS association with maxRank>2

[0032] 6 PT-RS Power Boosting The factor for the PUSCH to PT-RS power ratio per RE is indicated to the UE via higher layer configuration by the Power Boosting Factor PTRS-UplinkConfig IE.

[0033] The UL PTRS power boosting factor per PTRS port is defined in 3GPP TS 38.214v16.4.0 Table 6.2.3.1-3, reproduced below. TIFF0007813811000003.tif70164 Summary of the Invention

[0034] A system and method are disclosed for a phase tracking reference signal (PTRS) for physical uplink shared channel (PUSCH) transmissions to multiple transmission / reception points (TRPs). In one embodiment, a method performed by a wireless communication device includes receiving downlink control information (DCI) from a base station, the DCI scheduling PUSCH repetitions for two TRPs, the PUSCH configured by the base station having a maximum rank greater than 2. The DCI comprises an antenna port field indicating two or more demodulation reference signal (DMRS) ports, and either a single PTRS-DMRS (PTRS-DMRS) association field, the single PTRS-DMRS association field being a two-bit field, or two PTRS-DMRS association fields, the first and second PTRS-DMRS fields each having two bits. The method further comprises determining at least one DMRS port associated with at least one PTRS port for PUSCH transmission to the first TRP based on either a value of a most significant bit (MSB) of a single PTRS-DMRS association field included in the DCI or a first PTRS-DMRS association field, and determining at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the second TRP based on either a value of a least significant bit (LSB) of the single PTRS-DMRS association field included in the DCI or a second PTRS-DMRS association field.The method further includes transmitting a first PUSCH repetition using at least one PTRS port for PUSCH transmission to a first TRP and transmitting a second PUSCH repetition using at least one PTRS port for PUSCH transmission to a second TRP, wherein an MSB of the single PTRS-DMRS association field or the first PTRS-DMRS association field is associated with the first TRP, an LSB of the single PTRS-DMRS association field and a second PTRS-DMRS association field are associated with the second TRP, 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 MRS association field is associated with a first SRS resource set associated with the first TRP, the LSB of the single PTRS-DMRS association field or the second PTRS-DMRS association field is associated with the second SRP, 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, or the MSB of the single PTRS-DMRS association field or the first PTRS-DMRS association field is associated with a first transmit precoding matrix indicator (TPMI) field of the DCI associated with the first TRP, and the LSB of the single PTRS-DMRS association field or the second PTRS-DMRS association field is associated with a second TPMI field of the DCI associated with the second TRP.

[0035] In one embodiment, the DCI comprises a single PTRS-DMRS association field, the MSB of the single PTRS-DMRS association field is associated with a first TRP, the LSB of the single PTRS-DMRS association field is associated with a second TRP, 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.

[0036] In one embodiment, the DCI comprises two PTRS-DMRS association fields, a first and a second PTRS-DMRS field each having a 2-bit field, the first PTRS-DMRS association field is associated with a first TRP, the second PTRS-DMRS association field is associated with a second TRP, 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.

[0037] In one embodiment, the DCI comprises a single PTRS-DMRS association field, the MSB of the single PTRS-DMRS association field is associated with a first SRS resource set associated with a first TRP, the LSB of the single PTRS-DMRS association field is associated with a second SRS resource set 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.

[0038] In one embodiment, the DCI comprises two PTRS-DMRS association fields, a first and a second PTRS-DMRS field each having two bits, the first PTRS-DMRS association field being associated with a first SRS resource set associated with a first TRP, the second PTRS-DMRS association field being associated with a second SRS resource set associated with a second TRP, the first SRS resource set being associated with a first SRI field in the DCI, and the second SRS resource set being associated with a second SRI field in the DCI.

[0039] In one embodiment, the DCI comprises a single PTRS-DMRS association field, the DCI is for non-codebook-based PUSCH transmission, and further comprises a first SRI field and a second SRI field, wherein 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.

[0040] In one embodiment, the DCI comprises two PTRS-DMRS association fields, a first and a second PTRS-DMRS field each having two bits, and the DCI is for non-codebook-based PUSCH transmission and further comprises a first SRI field and a second SRI field, where 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.

[0041] In one embodiment, if the value of the MSB is "0" and a single PT-RS port 0 is configured, the PT-RS port 0 for the first TRP is associated with the first DMRS port indicated in the antenna port field of the DCI. If the value of the MSB is "1" and a single PT-RS port 0 is configured, the PT-RS port 0 for the first TRP is associated with the second DMRS port indicated in the antenna port field of the DCI.

[0042] In one embodiment, if the value of the LSB is "0" and a single PT-RS Port 0 is configured, the PT-RS Port 0 for the second TRP is associated with the first DMRS Port indicated in the Antenna Port field of the DCI. If the value of the LSB is "1" and a single PT-RS Port 0 is configured, the PT-RS Port 0 for the second TRP is associated with the second DMRS Port indicated in the Antenna Port field of the DCI.

[0043] In one embodiment, the DCI comprises a single PTRS-DMRS association field, the MSB of the single PTRS-DMRS association field being associated with a first TPMI field of the DCI associated with a first TRP, and the LSB of the single PTRS-DMRS association field being associated with a second TPMI field of the DCI associated with a second TRP.

[0044] In one embodiment, the DCI comprises two PTRS-DMRS association fields, a first and a second PTRS-DMRS field each having two bits, the first PTRS-DMRS association field being associated with a first TPMI field of the DCI associated with a first TRP, and the second PTRS-DMRS association field being associated with a second TPMI field of the DCI associated with a second TRP.

[0045] In one embodiment, the DCI comprises a single PTRS-DMRS association field, the DCI is for codebook-based PUSCH transmission, and further comprises a first TPMI field and a second TPMI field, wherein 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.

[0046] In one embodiment, the DCI comprises two PTRS-DMRS association fields, a first and a second PTRS-DMRS field each having two bits, and the DCI is for codebook-based PUSCH transmission and further comprises a first TPMI field and a second TPMI field, where 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.

[0047] In one embodiment, if the value of the MSB is "0" and a single PT-RS port 0 is configured, the PT-RS port 0 for the first TRP is associated with the first DMRS port indicated in the antenna port field of the DCI. If the value of the MSB is "1" and a single PT-RS port 0 is configured, the PT-RS port 0 for the first TRP is associated with the second DMRS port indicated in the antenna port field of the DCI.

[0048] In one embodiment, if the value of the LSB is "0" and a single PT-RS Port 0 is configured, the PT-RS Port 0 for the second TRP is associated with the first DMRS Port indicated in the Antenna Port field of the DCI. If the value of the LSB is "1" and a single PT-RS Port 0 is configured, the PT-RS Port 0 for the second TRP is associated with the second DMRS Port indicated in the Antenna Port field of the DCI.

[0049] In one embodiment, determining at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the first TRP comprises determining a first DMRS port associated with the first PTRS port for PUSCH transmission to the first TRP based on either an MSB of a single PTRS-DMRS association field included in the DCI or a first PTRS-DMRS association field, and determining at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the second TRP comprises determining a second DMRS port associated with the second PTRS port for PUSCH transmission to the second TRP based on either an LSB of the single PTRS-DMRS association field or a second PTRS-DMRS association field included in the DCI. Transmitting the first PUSCH repetition to the first TRP comprises transmitting the first PUSCH repetition to the first TRP with the first PTRS port associated with the first DMRS port, and transmitting the second PUSCH repetition to the second TRP comprises transmitting the second PUSCH repetition to the second TRP with the second PTRS port associated with the second DMRS port.

[0050] In one embodiment, a rank of 3 or 4 is indicated in the DCI, and the MSB of the single PTRS-DMRS association field indicates one of the first and third DMRS ports indicated in the antenna port field to be associated with the first PTRS port for PUSCH transmission to the first TRP, and the LSB of the single PTRS-DMRS association field indicates one of the first and third DMRS ports indicated in the antenna port field to be associated with the second PTRS port for PUSCH transmission to the second TRP.

[0051] In one embodiment, the first PTRS-DMRS association field indicates one of up to four DMRS ports indicated in the antenna port field to be associated with the first PTRS port for PUSCH transmission to the first TRP, and the second PTRS-DMRS association field indicates one of up to four DMRS ports indicated in the antenna port field to be associated with the first PTRS port for PUSCH transmission to the second TRP.

[0052] In one embodiment, the wireless communication device is configured with two PTRS ports per TRP, and determining at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the first TRP comprises: determining a first DMRS port associated with the first PTRS port for PUSCH transmission to the first TRP based on a value of an MSB of a single PTRS-DMRS association field included in the DCI or a first PTRS-DMRS association field; and determining a second DMRS port associated with a second PTRS port for PUSCH transmission to the first TRP based on either a value of an MSB of the single PTRS-DMRS association field included in the DCI or a value of an LSB of the first PTRS-DMRS association field. Determining at least one DMRS port associated with at least one PTRS port for PUSCH transmission to the second TRP comprises determining a third DMRS port associated with a third PTRS port for PUSCH transmission to the second TRP based on a value of either an LSB of the single PTRS-DMRS association field included in the DCI or an MSB of the second PTRS-DMRS association field, and determining a fourth DMRS port associated with a fourth PTRS port for PUSCH transmission to the second TRP based on a value of the LSB of the single PTRS-DMRS association field included in the DCI or the second PTRS-DMRS association field. Transmitting the first PUSCH repetition to the first TRP comprises transmitting the first PUSCH repetition to the first TRP having a first PTRS port associated with the first DMRS port and a second PTRS port associated with the second DMRS port, and transmitting the second PUSCH repetition to the second TRP comprises transmitting the second PUSCH repetition to the second TRP with a third PTRS port associated with the third DMRS port and a fourth PTRS port associated with the fourth DMRS port.

[0053] In one embodiment, the DCI comprises a single PTRS-DMRS association field, wherein the MSB of the single PTRS-DMRS association field indicates a first DMRS port associated with a first PTRS port from among a second DMRS port associated with a first DMRS port group and a second PTRS port from among 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 among a fourth DMRS port associated with the first DMRS port group and a fourth PTRS port from among the second DMRS port group.

[0054] In one embodiment, the DCI comprises two PTRS-DMRS Association fields, a first and second PTRS-DMRS field each having two bits, where the MSB of the first PTRS-DMRS Association field indicates a first DMRS port associated with a first PTRS port from the first DMRS port group, the LSB of the first PTRS-DMRS Association field indicates a second DMRS port associated with a second PTRS port from the second DMRS port group, the MSB of the second PTRS-DMRS Association field indicates a third DMRS port associated with a third PTRS port from the first DMRS port group, and the LSB of the second PTRS-DMRS Association field indicates a fourth DMRS port associated with a fourth PTRS port from the second DMRS port group.

[0055] In one embodiment, a first DMRS port is associated with a first PUSCH or SRS port group that shares PT-RS port 0, and a second DMRS port is associated with a second PUSCH or SRS port group that shares PT-RS port 1.

[0056] Corresponding 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, the DCI scheduling PUSCH repetitions for two TRPs, the PUSCH configured by the base station having a maximum rank greater than two. The DCI comprises an antenna port field indicating two or more DMRS ports, and either a single PTRS-DMRS association field that is a two-bit field or two PTRS-DMRS association fields, the PTRS-DMRS association fields being first and second PTRS-DMRS fields, each having two bits. The wireless communication device is further adapted to determine at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the first TRP based on an MSB of the single PTRS-DMRS association field included in the DCI or a value of the first PTRS-DMRS association field, and to determine at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the second TRP based on either an LSB of the single PTRS-DMRS association field included in the DCI or an LSB of the second PTRS-DMRS association field.The wireless communication device is further adapted to transmit a first PUSCH repetition to the first TRP on at least one PTRS port for a PUSCH transmission to the first TRP and transmit a second PUSCH repetition to the second TRP on at least one PTRS port for a PUSCH transmission to the second TRP, wherein an MSB of the single PTRS-DMRS association field or the first PTRS-DMRS association field is associated with the first TRP, an LSB of the single PTRS-DMRS association field or the second PTRS-DMRS association field is associated with the second TRP, 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 single PTRS-DMRS association field or the first PTRS-DMRS association field is associated with a first SRS resource set associated with the first TRP, the LSB of the single PTRS-DMRS association field or the second PTRS-DMRS association field is associated with a second SRS resource set associated with the 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; or the MSB of the single PTRS-DMRS association field or the first PTRS-DMRS association field is associated with a first TPMI field of the DCI associated with the first TRP, and the LSB of the single PTRS-DMRS association field or the second PTRS-DMRS association field is associated with a second TPMI field of the DCI associated with the second TRP.

[0057] In another embodiment, a method performed by a wireless communication device includes receiving a DCI from a base station, the DCI scheduling PUSCH repetitions for two TRPs, the DCI comprising 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 at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to a first TRP based on a value of an MSB of the PTRS-DMRS association field included in the DCI, and determining at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to a second TRP based on a value of an LSB of the PTRS-DMRS association field included in the DCI.The method further comprises transmitting a first PUSCH repetition to the first TRP on at least one PTRS port for PUSCH transmission to the first TRP, and transmitting a second PUSCH repetition to the second TRP on at least one PTRS port for PUSCH transmission to the first TRP, wherein an MSB of the PTRS-DMRS association field is associated with the first TRP, an LSB of the PTRS-DMRS association field is associated with the second TRP, 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 the first TRP. The MSB of the PTRS-DMRS association field is associated with the associated first SRS resource set, the LSB of the PTRS-DMRS association field is associated with the second SRS resource set associated with the second TRP, the first SRS resource set is associated with the first SRI field of the DCI, and the second SRS resource set is associated with the second SRI field of 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 associated with the first TRP, and the LSB of the PTRS-DMRS association field is associated with the second TPMI field of the DCI associated with the second TRP.

[0058] In another embodiment, a method performed by a wireless communication device includes receiving a DCI from a base station, the DCI scheduling PUSCH repetitions to two TRPs, the DCI including a DMRS port field, each having a 2-bit field, and an antenna port field indicating a first PTRS-DMRS association field and a second PTRS-DMRS association field. The method includes determining at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the first TRP based on a value of the at least one PTRS-DMRS association field included in the DCI, and determining at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the second TRP based on a value of the at least one PTRS-DMRS association field included in the DCI.The method further includes transmitting a first PUSCH repetition to the first TRP on at least one PTRS port for PUSCH transmission to the first TRP and transmitting a second PUSCH repetition to the second TRP on at least one PTRS port for PUSCH transmission to the second TRP, wherein the maximum rank is 4, and the first PTRS-DMRS association field is associated with a first SRS resource set associated with the first TRP and the second PTRS-DMRS association field is associated with a second SRS resource set associated with the second TRP, or the first PTRS-DMRS association field is associated with a first SRS resource set in the DCI associated with the first TRP. and the second PTRS-DMRS association field is associated with a second TPMI field in the DCI associated with the second TRP; or two PTRS ports are configured per TRP with a maximum rank of 4, the first PTRS-DMRS association field is associated with a first SRS resource set, the second PTRS-DMRS association field is associated with a second SRS resource set, the first SRS resource set is associated with a first SRI field in the DCI associated with the first TRP, and the second SRS resource set is associated with a second SRI field in the DCI associated with the second TRP.

[0059] Corresponding 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, the DCI scheduling PUSCH repetitions for two TRPs, the DCI comprising an antenna port field indicating two or more DMRS ports, a first PTRS-DMRS association field, and a second PTRS-DMRS association field, each of which is a 2-bit field. The wireless communication device is further adapted to determine, based on a value of the at least one PTRS-DMRS association field included in the DCI, at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the first TRP, and to determine, based on a value of the at least one PTRS-DMRS association field included in the DCI, at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the second TRP.The wireless communication device is further adapted to transmit a first PUSCH repetition to a first TRP on at least one PTRS port for PUSCH transmission to the first TRP, and transmit a second PUSCH repetition to a second TRP on at least one PTRS port for PUSCH transmission to the second TRP, wherein the maximum rank is 4, and the first PTRS-DMRS association field is associated with a first SRS resource set associated with the first TRP, and the second PTRS-DMRS association field is associated with a second SRS resource set associated with the second TRP, or the first PTRS-DMRS association field is The first PTRS-DMRS association field is associated with a first TPMI field, and the second PTRS-DMRS association field is associated with a second TPMI field in the DCI associated with the second TRP; or two PTRS-DMRS ports are configured per TRP, with a maximum rank of 4, the first PTRS-DMRS association field is associated with a first SRS resource set, the second PTRS-DMRS association field is associated with a second SRS resource set, the first SRS resource set is associated with a first SRI field in the DCI associated with the first TRP, and the second SRS resource set is associated with a second SRI field in the DCI associated with the second TRP.

[0060] Also disclosed are embodiments of a method performed by a base station. In one embodiment, the method performed by the base station includes transmitting a DCI to a wireless communication device, the DCI scheduling PUSCH repetitions for two TRPs, the DCI comprising 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, an MSB of the PTRS-DMRS association field being associated with a first TRP and an LSB of the PTRS-DMRS association field being associated with a second TRP, the first TRP being associated with a first SRI field in the DCI and the second TRP being associated with a second SRI field in the DCI, or The MSB of the RS-DMRS association field is associated with a first SRS resource set associated with a first TRP, the LSB of the PTRS-DMRS association field is associated with a second SRS resource set 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, or the MSB of the PTRS-DMRS association field is associated with a first TPMI field of the DCI associated with the first TRP, and the LSB of the PTRS-DMRS association field is associated with a second TPMI field of the DCI associated with the second TRP.

[0061] In another embodiment, a method performed by a base station comprises receiving a DCI to a wireless communication device, the DCI scheduling PUSCH repetitions to two TRPs, the DCI comprising 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 a 2-bit field with a maximum rank of 4, the first PTRS-DMRS association field associated with a first SRS resource set associated with the first TRP, and the second PTRS-DMRS association field associated with a second SRS resource set associated with the second TRP, or is associated with a first TPMI field in a DCI associated with the first TRP, and a second PTRS-DMRS association field is associated with a second TPMI field in a DCI associated with the second TRP; or two PTRS ports per TRP are configured with a maximum rank of 4, and 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, and the first SRS resource set is associated with a first SRI field in a DCI associated with the first TRP, and the second SRS resource set is associated with a second SRI field in a DCI associated with the second TRP.

[0062] Corresponding embodiments of a base station are also disclosed. [Brief explanation of the drawings]

[0063] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate several aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.

[0064] [Figure 1]FIG. 1 shows the time-domain structure of 3rd Generation Partnership Project (3GPP®) New Radio (NR) with 15 kilohertz (kHz) subcarrier spacing.

[0065] [Figure 2] Figure 2 shows the basic NR physical time-frequency resource grid.

[0066] [Figure 3] FIG. 3 shows an example of Type 1 and Type 2 demodulation reference signals (DMRS) with single symbol DMRS.

[0067] [Figure 4] FIG. 4 illustrates an exemplary phase tracking reference signal for a cyclic prefix orthogonal frequency division multiplexing (CP-OFDM) based waveform.

[0068] [Figure 5] FIG. 5 illustrates an example of physical uplink shared channel (PUSCH) repetition to two transmission / reception points (TRPs) scheduled by downlink control information (DCI) indicating two sounding reference signal (SRS) resource indicator (SRI) fields.

[0069] [Figure 6] FIG. 6 illustrates an example of a cellular communication system in which embodiments of the present disclosure may be implemented.

[0070] [Figure 7A] An example of PUSCH repetition for two TRPs (denoted as TRP#1 and TRP#2) is shown, where the PUSCH consists of two layers associated with one of DMRS ports 0 and 1, respectively. [Figure 7B] An example of PUSCH repetition for two TRPs (denoted as TRP#1 and TRP#2) is shown, where the PUSCH consists of two layers associated with one of DMRS ports 0 and 1, respectively.

[0071] [Figure 8] FIG. 8 illustrates an example of SRS port, DMRS port, and PT-RS port associations according to one embodiment of the present disclosure.

[0072] [Figure 9] FIG. 9 illustrates an example of associating a DMRS port with a PT-RS port when two PT-RSs are configured per TRP, according to one embodiment of the present disclosure.

[0073] [Figure 10] FIG. 10 illustrates an example of determining DMRS port to PTRS port association for PUSCH to the first TRP for rank 3 according to one embodiment of the present disclosure.

[0074] [Figure 11A] 1 illustrates the operation of a NR base station (gNB) including a user equipment (UE) and two TRPs (TRP 1 and TRP 2), according to some embodiments of the present disclosure. [Figure 11B] 1 illustrates the operation of a NR base station (gNB) including a user equipment (UE) and two TRPs (TRP 1 and TRP 2), according to some embodiments of the present disclosure.

[0075] [Figure 12A] 1 illustrates the operation of a gNB including a UE and two TRPs (TRP 1 and TRP 2) according to some other embodiments of the present disclosure. [Figure 12B] 1 illustrates the operation of a gNB including a UE and two TRPs (TRP 1 and TRP 2) according to some other embodiments of the present disclosure.

[0076] [Figure 13] FIG. 1 is a schematic block diagram of an exemplary embodiment of a network node. [Figure 14] FIG. 1 is a schematic block diagram of an exemplary embodiment of a network node. [Figure 15] FIG. 1 is a schematic block diagram of an exemplary embodiment of a network node.

[0077] [Figure 16] 1 is a schematic block diagram of an exemplary embodiment of a wireless device. [Figure 17] 1 is a schematic block diagram of an exemplary embodiment of a wireless device.

[0078] [Figure 18] FIG. 18 illustrates an exemplary embodiment of a communication system in which embodiments of the present disclosure may be implemented.

[0079] [Figure 19] FIG. 19 illustrates an exemplary embodiment of the host computer, base station, and UE of FIG.

[0080] [Figure 20] 19 is a flow chart illustrating an exemplary embodiment of a method implemented in a communication system such as that of FIG. 18. [Figure 21] 19 is a flow chart illustrating an exemplary embodiment of a method implemented in a communication system such as that of FIG. 18. [Figure 22] 19 is a flow chart illustrating an exemplary embodiment of a method implemented in a communication system such as that of FIG. 18. [Figure 23] 19 is a flow chart illustrating an exemplary embodiment of a method implemented in a communication system such as that of FIG. 18. DETAILED DESCRIPTION OF THE INVENTION

[0081] The embodiments described below represent information to enable those skilled in the art to practice the embodiments and illustrate the best modes for practicing the embodiments. Upon reading the following description in light of the accompanying drawings, those skilled in the art will understand the concepts of the present disclosure and will recognize applications of these concepts not specifically addressed herein. It is understood that these concepts and applications are within the scope of the present disclosure.

[0082] Some of the embodiments contemplated herein will now be described more fully with reference to the accompanying drawings, although other embodiments are within the scope of the subject matter disclosed herein and the disclosed subject matter should not be construed as limited to only the embodiments described herein, but rather, these embodiments are provided as examples to convey the scope of the subject matter to those skilled in the art.

[0083] In general, all terms used herein should be interpreted according to their ordinary meaning in the relevant technical field unless a different meaning is expressly given and / or implied from the context in which it is used. All references to a / an / the element, apparatus, component, means, step, etc. should be interpreted openly as referring to at least one instance of the element, apparatus, component, means, step, etc., unless explicitly stated otherwise. The steps of any method disclosed herein need not be performed in the exact order disclosed, unless a step is expressly described as following or preceding another step and / or it is implicit that a step must follow or precede another step. Any feature of any of the embodiments disclosed herein may be applied to any other embodiment, whenever appropriate. Similarly, any advantage of any embodiment may be applied to any other embodiment, and vice versa. Other objects, features, and advantages of the accompanying embodiments will become apparent from the following description.

[0084] Wireless Node: As used herein, a "wireless node" is either a wireless access node or a wireless communication device.

[0085] Radio Access Node: As used herein, a “radio access node” or “radio network node” or “radio access network node” is any node in a Radio Access Network (RAN) of a cellular communications network that operates to transmit and / or receive (transmit and receive) signals wirelessly. Some examples of a radio access node include, but are not limited to, a base station in a 3rd Generation Partnership Project (3GPP®) Long Term Evolution (LTE) network (e.g., an NR base station (gNB) or an enhanced or evolved Node B (eNB) in a 3GPP® Fifth Generation (5G) New Radio (NR) network), a high-power or macro base station, a low-power base station (e.g., a micro base station, a pico base station, a Home eNB, etc.), a relay node, a network node that performs some of the functionality of a base station (e.g., a network node implementing a gNB Central Unit (gNB-CU) or a network node implementing a gNB Distributed Unit (gNB-DU)), or a network node that performs some of the functionality of some other type of radio access node.

[0086] Core Network Node: As used herein, a "core network node" is any kind of node in a core network or any node that implements a core network function. Some examples of core network nodes include, for example, a Mobility Management Entity (MME), a Packet Data Network Gateway (P-GW), a Service Capability Publication Function (SCEF), a Home Subscriber Server (HSS), etc. Some other examples of core network nodes include nodes that implement an Access and Mobility Management Function (AMF), a User Plane Function (UPF), a Session Management Function (SMF), an Authentication Server Function (AUSF), a Network Slice Selection Function (NSSF), a Network Publication Function (NEF), a Network Function (NF) Repository Function (NRF), a Policy Control Function (PCF), a Unified Data Management (UDM), etc.

[0087] Communications Device: As used herein, a "communications device" is any type of device that has access to an access network. Some examples of communications devices include, but are not limited to, a mobile phone, a smartphone, a sensor device, a meter, a vehicle, a home appliance, a medical device, a media player, a camera, or any type of consumer electronics device, such as, but not limited to, a television, a radio, a lighting fixture, a tablet computer, a laptop, or a personal computer (PC). A communications device may be a portable, handheld, computer-embedded, or vehicle-mounted mobile device capable of communicating voice and / or data over a wireless or wired connection.

[0088] Wireless Communication Device: One type of communication device is a wireless communication device, which can be any type of wireless device that accesses (i.e., is served by) a wireless network (e.g., a cellular network). Some examples of wireless communication devices include, but are not limited to, user equipment devices (UEs) in 3GPP networks, machine-type communication (MTC) devices, and Internet of Things (IoT) devices. Such wireless communication devices can be or can be integrated into mobile phones, smartphones, sensor devices, meters, vehicles, home appliances, medical devices, media players, cameras, or any type of consumer electronics, such as, but not limited to, televisions, radios, lighting fixtures, tablet computers, laptops, or PCs. Wireless communication devices can be portable, handheld, computer-based, or vehicle-mounted mobile devices capable of communicating voice and / or data over a wireless connection.

[0089] Network Node: As used herein, a "network node" is any node that is part of either the RAN or core network of a cellular communications network / system.

[0090] Transmission / Reception Point (TRP): In some embodiments, a TRP can be a network node, a radio head, a spatial relationship, or a 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 the DCI, a spatial relationship, 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 and receives radio signals to and from a UE according to physical layer characteristics and parameters specific to that element. In some embodiments, multi-TRP operation allows a serving cell to schedule a UE from two TRPs, providing better physical downlink shared channel (PDSCH) coverage, reliability, and / or data rates. There are two different modes of operation for multi-TRP: single downlink control information (DCI) and multi-DCI. For both modes, control of uplink and downlink operations is performed by both the physical layer and medium access control (MAC). In single DCI mode, the UE is scheduled by the same DCI for both TRPs, while in multi-DCI mode, the UE is scheduled by independent DCI from each TRP.

[0091] In some embodiments, a set transmission point (TP) is a geographically collocated set of transmit antennas (e.g., an antenna array (having one or more antenna elements)) for one cell, part of a cell, or one Positioning Reference Signal (PRS)-only TP. The TP may include a base station (eNB) antenna, a remote radio head (RRH), a base station remote antenna, an antenna of a PRS-only TP, etc. One cell may be formed by one or more TPs. In the case of a homogeneous deployment, each TP may correspond to one cell.

[0092] In some embodiments, a set of TRPs is a geographically collocated set of antennas (e.g., an antenna array (having one or more antenna elements)) that supports TP and / or receiving point (RP) functionality.

[0093] It should be noted that the description provided herein focuses on 3GPP® cellular communication systems, and therefore 3GPP® terminology or terminology similar to 3GPP® terminology is often used, however, the concepts disclosed herein are not limited to 3GPP® systems.

[0094] It should be noted that although the description herein may refer to the term "cell," it is important to note that, particularly with regard to 5G NR concepts, beams may be used instead of cells, and therefore the concepts described herein are equally applicable to both cells and beams.

[0095] Currently, certain challenges exist. One problem is that when a physical uplink shared channel (PUSCH) is scheduled using repetition with reception of multiple TRPs, the layer with the strongest signal-to-interference-and-noise ratio (SINR) is not the same for all (both) TRPs. Therefore, even if the best layer is selected for transmission to the first TRP, it may not generally be the best for the repetition transmission to the second TRP. Therefore, phase tracking performance is degraded, which also means that uplink throughput is degraded.

[0096] When introducing support for PUSCH repetition for more than one TRP, the following issues arise for phase tracking reference signals (PT-RS): There is no discussion in 3GPP on how to support PT-RS to multiple TRPs with PUSCH transmissions of max rank > 2. The current agreement on using one bit per TRP for PT-RS to Demodulation Reference Signal (DM-RS) association indication is only for max rank = 2. How to support two PT-RS ports per TRP receiver How to associate / map the 2-bit "PTRS-DMRS association" field in the Downlink Control Information (DCI) to the two TRPs, which is an open question that is also valid for rank 2 and 3 transmissions. How does the UE report its PT-RS capabilities in case of PUSCH transmission for multiple TRPs?

[0097] Certain aspects of the present disclosure and embodiments thereof may provide solutions to the above-mentioned or other problems. Disclosed herein are systems and methods that include one or more of the following aspects: 1. If DCI indicating PUSCH repetition to two TRPs and one PT-RS port per TRP is configured, a. The most significant bit (MSB) and least significant bit (LSB) of the "PTRS-DMRS Association" field in the DCI are associated with first and second Sounding Reference Signal (SRS) Resource Indicator (SRI) fields in the DCI for non-codebook-based PUSCH transmissions, respectively, and with first and second Transmit Precoding Matrix Indicator (TPMI) fields in the DCI for codebook-based PUSCH transmissions. The first and second SRI or TPMI fields are associated with first and second TRPs, respectively. If the SRI or TPMI field is not present, the PT-RS field is ignored. b. In one embodiment, the above association is applicable to a maximum rank of up to 2 or 4, where the MSB and LSB indicate one of the first and second DMRS ports indicated in the “Antenna Port” field in the DCI to be associated with the PT-RS port for PUSCH transmission to the first and second TRP, respectively. c. In another embodiment, if rank 3 or 4 is indicated in the DCI, the MSB and LSB indicate one of the first and third DMRS ports indicated in the “Antenna Port” field in the DCI that should be associated with the PT-RS port for PUSCH transmission to the first and second TRP, respectively. d. In a further embodiment, the DCI may include two "PTRS-DMRS Association" fields associated with each TRP. 2. If PUSCH repetitions for two TRPs are scheduled by DCI and two PT-RS ports, PT-RS ports 0 and 1, are configured per TRP, In one embodiment, the most significant bit 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 to DM-RS association indicated that the "PTRS-DMRS Association" field in the DCI applies to both TRPs. b. In another embodiment, the "PTRS-DMRS Association" field in the DCI is for the first TRP only. The PTRS-DMRS association for the second TRP is predetermined. c. In a further embodiment, the MSB and LSB of the "PTRS-DMRS Association" field in the DCI are for the first and second TRPs, respectively. For each TRP, the first and second DMRS ports are selected from the first and second DMRS port groups for PT-RS ports 0 and 1, respectively, and the first and second DMRS ports are associated with the first and second PUSCH or SRS port groups, respectively. The selection is rank dependent. c. In one embodiment, both a and b may be supported, and higher layers configure the UE with one of them. 3. The PT-RS to PUSCH power ratio can be configured per TRP.

[0098] In some embodiments, a single 2-bit "PTRS-DMRS Association" field in a DCI scheduling PUSCH repetitions to two TRPs is used to indicate one or two DMRS ports associated with one or two PTRS ports for PUSCH transmission to each TRP. Using a single "PTRS-DMRS Association" field with two bits can save DCI overhead and can share the same field with legacy PUSCH transmissions to a single TRP.

[0099] Since the PUSCH repetition for each TRP can have up to four layers each associated with a DMRS port, the question is how to use the two bits to indicate one or two of the up to four DMRS ports for each of the two TRPs.

[0100] In one embodiment, the MSB and LSB of the "PTRS-DMRS Association" field are for the first and second TRPs, respectively. Even though three or four DMRS ports may be indicated in the DCI, only the first two DMRS ports may be selected for PT-RS port association. The drawback is that if the strongest layer is associated with the third or fourth DMRS port, phase tracking performance will be degraded.

[0101] In another embodiment, the DMRS-PTRS indication in the DCI is always associated with a PUSCH transmission to one of the two TRPs (e.g., the first TRP) when repetition is configured. For PUSCH repetition to 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, no SINR gain is obtained for PTRS transmission to the second TRP, but an SINR gain is obtained for the first TRP.

[0102] In yet another embodiment, when two PTRS ports are configured for PUSCH transmission and PUSCH repetitions for two TRPs are scheduled, the DMRS ports {k1, k2, k3, k4} indicated in the DCI are divided into two DMRS port groups, DMRS port groups A and B, where DMRS port group A is associated with the SRS port group consisting of SRS ports 1000 and 1002 within the SRS resources in the first (or second) SRS resource set associated with the first (or second) SRI field of the DCI. DMRS port group B is associated with the SRS port group consisting of SRS ports 1001 and 1003. The MSB and LSB of the "PTRS-DMRS Association" field in the DCI are for the first and second TRPs, respectively.

[0103] If the DCI indicates rank 4, 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). The first and second DMRS ports associated with the first and second PT-RS ports, respectively, are determined as DMRS ports a1 and b1, respectively, if the MSB (or LSB) of the "PTRS-DMRS Association" field is 0, or as DMRS ports a2 and b2, respectively, if the MSB (or LSB) of the "PTRS-DMRS Association" field is 1.

[0104] If rank 3 is indicated, one DMRS port group has one DMRS port and the other DMRS port group has two DMRS ports. The MSB (or LSB) of the "PTRS-DMRS Association" field indicates the DMRS port in the DMRS port group that has two DMRS ports for the associated PT-RS port.

[0105] If rank 2 is indicated and the two associated DMRS ports are in the same DMRS port group, a single PTRS port is transmitted. The MSB (or LSB) of the "PTRS-DMRS Association" field indicates the DMRS port in the DMRS port group that has two DMRS ports for the single PTRS port. Otherwise, if each DMRS port group contains one DMRS port, the "PTRS-DMRS Association" field may be ignored. The first or second DMRS port is the DMRS port in the first or second DMRS port group, respectively.

[0106] In yet another embodiment, two 2-bit "PTRS-DMRS Association" fields may be included in the DCI, one for each TRP.

[0107] In another embodiment, first and second PT-RS to PUSCH energy (EPRE) ratios per resource element are configured for the first and second TRPs, respectively.

[0108] Particular embodiments may provide one or more of the following technical advantages: Embodiments of the solution(s) described herein may enable PUSCH repetition with two PT-RS ports transmitted to each TRP when partial or non-coherent antenna ports are used at the UE. Embodiments may enable PUSCH repetition with rank > 2 for two TRPs for better UL UE throughput without increasing DCI overhead.

[0109] FIG. 6 illustrates an example of a cellular communication system 600 in which embodiments of the present disclosure may be implemented. 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), although the present disclosure is not limited thereto. Embodiments of the present disclosure may be used in any type of wireless or cellular communication system in which multi-TRP transmission is desired. In this example, the RAN includes base stations 602-1 and 602-2, and the 5GS includes NR base stations (gNBs) and, optionally, Next Generation eNBs (ng-eNBs), which control corresponding (macrocell) cells 604-1 and 604-2. The base stations 602-1 and 602-2 are generally referred to herein collectively as base stations 602 and individually as base stations 602. Similarly, the (macrocell) cells 604-1 and 604-2 are generally referred to herein collectively as (macrocell) cell 604 and individually as (macrocell) cell 604. The RAN may also include several low-power nodes 606-1 through 606-4 that control corresponding small cells 608-1 through 608-4. The low-power nodes 606-1 through 606-4 may be small base stations (such as pico or femto base stations) or remote radio heads (RRHs), etc. Notably, although not shown, one or more of the small cells 608-1 through 608-4 may alternatively be provided by the base station 602. The low-power nodes 606-1 through 606-4 are generally referred to herein collectively as low-power nodes 606 and individually as low-power nodes 606. Similarly, the small cells 608-1 through 608-4 are generally referred to herein collectively as small cells 608 and individually as small cells 608. The cellular communication system 600 also includes a core network 610, referred to as 5GC in 5GS. The base stations 602 (and optionally the low-power nodes 606) are connected to the core network 610.

[0110] Base station 602 and low power node 606 serve wireless communication devices 612-1 through 612-5 within corresponding cells 604 and 608. Wireless communication devices 612-1 through 612-5 are generally referred to herein collectively as wireless communication devices 612 and individually as wireless communication devices 612. In the following description, wireless communication devices 612 are often UEs and, therefore, may be referred to herein as UEs 612, although the disclosure is not limited thereto.

[0111] Hereinafter, an embodiment of the present invention will be described.

[0112] 1. UL PT-RS instructions for multiple TRPs 7A and 7B show an example of PUSCH repetitions for two TRPs (denoted as TRP#1 and TRP#2), where the PUSCH consists of two layers associated with one of DM-RS ports 0 and 1, respectively. The same number of layers is transmitted for each TRP, and the same time and frequency resources are used for each slot. PUSCH repetitions may be dynamically scheduled using DCI (e.g., DCI format 0_1 ​​or DCI format 0_2). For phase tracking purposes, the PT-RS port is also transmitted along with each PUSCH transmission in this example. Because the channels to the two TRPs may be different, the strongest layer may be different for the two TRPs. In this example, the strongest layer for TRP#1 is the layer associated with DM-RS port 1, and the strongest layer for TRP#2 is the layer associated with DM-RS port 0. For best phase tracking performance, the PT-RS port should be associated with the strongest layer in each PUSCH repetition. Thus, in this example, a 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, where association means that the PT-RS port is located in 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.

[0113] In the embodiments described herein, the association between the PT-RS port and the DM-RS port for each TRP is indicated by a 2-bit PT-RS to DM-RS association bit field in the DCI that schedules the corresponding PUSCH repetition.

[0114] The term "TRP" may not appear directly in the 3GPP standard; instead, the SRS resource set, SRI field, TPMI field, spatial relationship, or UL TCI status field may be used as part of the standard, which is then equivalent to indicating a certain TRP.

[0115] 1.1 One PT-RS port per TRP configured by higher layers In some of the following embodiments, a single PTRS-DMRS association field in the DCI is assumed.

[0116] When one PT-RS port is configured by higher layers for PUSCH transmission and PUSCH repetitions to two TRPs are scheduled by the DCI, in one embodiment, for non-codebook-based PUSCH transmissions configured with two SRS resource sets with usage 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 first SRS resource set), and the least significant bit (LSB) is associated with the second TRP (or second SRS resource set), and the first and second TRPs (or first and second SRS resource sets) are associated with the first and second SRI fields in the DCI if the SRI field is present. If the SRI field is not present, the PT-RS field is ignored, as it implies a single-layer PUSCH transmission with a single DMRS port. The PTRS port is associated with the DMRS port, and there is no need for explicit indication of the PTRS to DMRS association using the PTRS-DMRS Association field. An example is shown in Table 1, where the MSB is for a first TRP associated with a first SRS resource set and the LSB is for a second TRP associated with a second SRS resource set. TIFF0007813811000004.tif86149

[0117] For codebook-based PUSCH transmission, the MSB and LSB of the "PTRS-DMRS Association" field in the DCI are associated with the first and second TRPs (or TPMI fields), respectively, in the DCI, and the first and second TPMI fields are associated with the first and second TRPs (or first and second SRS resource sets). If the TPMI field is not present, the "PTRS-DMRS Association" field is ignored. An example is shown in Table 5, 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 may be the existing "Precoding Information and Number of Layers" field in DCI Format 0_1 ​​or DCI Format 0_2, and the second TPMI field may be a new field containing only precoding information in DCI Format 0_1 ​​or DCI Format 0_2. TIFF0007813811000005.tif85153

[0118] Note that in both the example of Table 4 and the example of Table 5, one of the first DMRS port and the second DMRS port may be selected. In one embodiment, the above association is only applicable to a maximum rank of 2. Ranks 3 and 4 are not supported for PUSCH repetition to multiple TRPs.

[0119] In another embodiment, the above association is also applicable to a maximum rank of 1 to 4, in which case the third and fourth layers cannot be selected for DMRS-PTRS port association, which may result in degraded phase tracking performance if a strong PUSCH layer is associated with one of the third and fourth DMRS ports.

[0120] Alternatively, for four layers (i.e., TPMI indexes 2 and 3 of the matrix in Table 6.3.1.5-7 of 3GPP TS 38.211, index 2 = Precoding matrix of TPMI in TIFF0007813811000006.tif3247, index 3 = By analyzing the codebook configuration of the partially coherent codebook (precoding matrix of TMPI in TIFF0007813811000007.tif3046), it is observed that the first and second layers (i.e., associated with the first and second columns of TMPI) are jointly precoded and transmitted from one subset of 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 such two polarizations often have similar SINRs. Therefore, for full rank transmission (rank 4 in this case) and partially coherent precoder selection, there is a slight advantage to indicating either the first or third DMRS port to be associated with PTRS port 0, since they tend to be more different in SINR compared to the first and second or 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, two bits are used to select between the first and third DMRS ports for the first and second TRPs, respectively. This applies when rank=4 is used and TPMI=2 or 3 is used.

[0121] For the same reason, the first and third DMRS ports may be selected for PTRS association to the first and second TRPs, respectively. Thus, for rank 3 or 4, Table 6 applies. TIFF0007813811000008.tif101148

[0122] In further embodiments, Table 6 applies only when the codebook subset is configured as "partially and non-coherent" and / or "non-coherent" or when a specific TPMI is indicated.

[0123] In an alternative embodiment, when one PT-RS port per TRP is configured by higher layers and PUSCH repetitions to two TRPs are scheduled by a DCI for non-codebook-based PUSCH transmission, two "PTRS-DMRS Association" fields are present in the DCI when the maximum number of PUSCH transmission layers (i.e., rank) is configured to be four. The first "PTRS-DMRS Association" field in the DCI is associated with a first SRS resource set, the second "PTRS-DMRS Association" field in the DCI is associated with a second SRS resource set, and the first and second SRS resource sets are associated with the first and second SRI fields in the DCI if the SRI fields are present. If the SRI fields are not present, 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.

[0124] In another embodiment, even if two SRS resource sets are configured (i.e., two SRI fields are present in the scheduling DCI), the UE only needs to schedule PUSCH transmissions for one of the TRPs. In this embodiment, the PUSCH is repeated across multiple transmission opportunities for the same TRP 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 the PTRS with the DMRS, the UE will use the "PTRS-DMRS Association" field associated with the SRS resource set corresponding to the SRI field used for PUSCH scheduling. For example, if the PUSCH is scheduled only according to the first SRI field, the UE will use only the first "PTRS-DMRS Association" field to determine the PT-RS to 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 may be applicable to either codebook-based or non-codebook-based PUSCH transmissions. This embodiment is applicable when one or two PTRS ports per TRP are configured by higher layers.

[0125] In another embodiment, for codebook-based PUSCH transmission, two "PTRS-DMRS Association" fields are present 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 when a TPMI field is present, and the first and second TPMI fields are associated with the first and second SRS resource sets. If a TPMI field is not present, the "PTRS-DMRS Association" field is ignored.

[0126] When one PT-RS port is configured by higher layers and PUSCH to a single TRP is scheduled via DCI, the PT-RS and DM-RS association follows Table 7.3.1.1.2-25 of 3GPP® TS 38.212. In some embodiments, when one PT-RS port is configured by higher layers and PUSCH to multiple TRPs is scheduled via DCI that includes two "PTRS-DMRS Association" fields (i.e., one field per TRP), the PT-RS to DM-RS association corresponding to each of the two "PTRS-DMRS Association" fields follows Table 7.3.1.1.2-25 of 3GPP® TS 38.212.

[0127] In one additional embodiment, when PUSCH repetition is configured for more than one TPR, the PTRS-DMRS association is valid only for transmissions to one of the TRPs (e.g., the first / lowest SRI), while the default association given by the standard (e.g., always the first DMRS port sharing the PTRS port) is used for the other TRPs.

[0128] 1.2 Two PT-RS ports per TRP configured by higher layers In at least some of the following embodiments, a single PTRS-DMRS association field in the DCI is assumed.

[0129] If two PT-RS ports, PT-RS port 0 and 1, are configured by higher layers for PUSCH transmission per TRP, and PUSCH repetitions to the two TRPs are scheduled by the DCI, in one embodiment, the most significant bit 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 to DM-RS association indicated that the "PTRS-DMRS Association" field in the DCI applies to PUSCH transmissions to both TRPs.

[0130] Alternatively, the MSB of the "PTRS-DMRS Association" field in the DCI is for the first TRP and the LSB of the field is 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.

[0131] An example of SRS ports, DMRS ports, and PT-RS ports is shown in FIG. 8, where it is assumed that the first SRI field in the DCI indicates an SRS resource having four ports, ports 1000-1003, the associated TPMI field in the DCI (e.g., the first TPMI field) indicates rank 4 and the "antenna port" field in the DCI indicates four DMRS ports {k1, k2, k3, k4}. According to 3GPP TS 38.214, when 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 another 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 the SRS ports and PUSCH ports are the same and are interchangeable.

[0132] For rank 4, there are two DMRS ports {A1, A2} associated with the first SRS port group and another two DMRS ports {B1, B2} associated with the second SRS port group, where Ai, Bi ∈ {k1, k2, k3, k4}, i = 1, 2. The association of DMRS ports to SRS ports is implicitly indicated in the TPMI. For example, if TPMI index 2 is indicated in Table 6.3.1.5-7 of 3GPP TS 38.211, the corresponding precoding matrix In TIFF0007813811000009.tif2946, 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 most significant bit of the "PTRS-DMRS Association" field in the DCI indicates DMRS port A1 of PT-RS port 0 and DMRS port B1 of PT-RS port 1 if the most significant bit = 0, or DMRS port A2 of PT-RS port 0 and DMRS port B2 of PT-RS port 1 if the most significant bit = 1. This is shown in Figure 9.

[0133] When rank 3 is indicated, one DMRS port is associated with one SRS port group and two DMRS ports are associated with the other SRS port group, and the MSB of the "PTRS-DMRS Association" field indicates one of the two DMRS ports in the SRS port group for the PT-RS port associated with the 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 the MSB is set to 0, the second DMRS port is selected as PTRS port 1. Otherwise, if the MSB is set to 1, the third DMRS port is selected as PTRS port 1. The first DMRS port is associated with PT-RS port 0. This example of determining the DMRS port-to-PTRS port association for the PUSCH to the first TRP for rank 3 is shown in FIG. 10.

[0134] If rank 2 is indicated and the two associated DMRS ports are associated with the same SRS port group, the MSB of the "PTRS-DMRS Association" field indicates one of the two DMRS ports of the PT-RS port associated with the SRS port group, and the other PT-RS port is not transmitted. 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.

[0135] The same procedure as above is applied to the DMRS port determination for the PT-RS port having the LSB of the "PTRS-DMRS Association" field in the DCI for the second TRP.

[0136] When two PT-RS ports are configured by higher layers and PUSCH to a single TRP is scheduled by DCI, the association of the PT-RS and DM-RS follows Table 7.3.1.1.2-26 of 3GPP TS 38.212.

[0137] In one additional embodiment, when PUSCH repetitions are configured for more than one TPR, the PTRS-DMRS association is valid only for transmissions to one of the TRPs (e.g., associated with the first SRI field in the DCI), while using the default association given by the others (e.g., the first DMRS port that always shares the PTRS port).

[0138] In an alternative embodiment, when two PT-RS ports (PT-RS ports 0 and 1) per TRP are configured by higher layers, and when PUSCH repetitions to two TRPs are scheduled by the DCI, and the maximum number of PUSCH transmission layers (i.e., rank) is configured to be four, two "PTRS-DMRS Association" fields are present in the DCI. The first "PTRS-DMRS Association" field in the DCI is associated with a first SRS resource set, and the second "PTRS-DMRS Association" field in the DCI is associated with a second SRS resource set, and the first and second SRS resource sets are associated with the first and second SRI fields in the DCI if the SRI field is present. If the SRI field is not present, the first and second "PTRS-DMRS Association" fields in the DCI are associated with the first and second TPMI fields in the DCI. If both the SRI and TPMI fields are not present, the PT-RS field is ignored. The PT-RS-DMRS association for each of the two "PTRS-DMRS Association" fields follows Table 7.3.1.1.2-25 of 3GPP TS 38.212.

[0139] In another embodiment, for a non-codebook-based PUSCH to two TRPs, the number of PT-RS ports determined for each TRP may be different (i.e., one PT-RS port for TRP1 and two PT-RS ports for TRP2). In this case, two "PTRS-DMRS Association" fields in the DCI may be used to provide the association between the PT-RS and DMRS for each TRP. The number of PTRS ports per TRP is determined based on the SRI indicated by the two SRI fields in the DCI (i.e., one SRI field corresponding to each TRP). For a PUSCH transmission corresponding to a single PT-RS port (or a subset of PUSCH repetitions), 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 corresponding to two PT-RS ports (or the remaining set of PUSCH repetitions), the PTRS-DMRS association is provided by the corresponding "PTRS-DMRS Association" field according to Table 7.3.1.1.2-26 of 3GPP TS 38.212.

[0140] 1.3 UE Capability Signaling for PT-RS In the case of PUSCH repetition for multiple TRPs, the UE can report a new capability regarding the number of supported PT-RS ports in addition to the existing reporting parameters, i.e., "onePortsPTRS" and "twoPortsPTRS-UL" (see 3GPP TS 38.306v16.3.0). The new parameter indicates the maximum number of PT-RS ports for each TRP and is only applicable to PUSCH repetition for multiple TRPs. The reason is that different receive antenna panels can be used in the UE for PUSCH transmission to a single TRP and to multiple TRPs.

[0141] 1.4 PT-RS Power Boost The factor for the PT-RS to PUSCH power ratio per layer per RE is indicated to the UE via higher layer configuration by the power boost factor ptrs-Power in the PTRS-UplinkConfig IE.

[0142] For PT-RS from PUSCH to multiple TRPs, separate power boost configurations per TRP may be supported. The PT-RS boost factor per TRP may be configured differently for each TRP. The value indicated via ptrs-Power in the PTRS-UplinkConfig IE may be used to support two TRPs. In one embodiment, values ​​p00, p01 are used when both TRPs are configured with the same power boost, and values ​​p10, p11 are used when different power boosting factors are configured for the first and second TRPs.

[0143] When PT-RSs for two TRPs are configured and the UE is capable of applying different power boost factors to the PT-RSs associated with different TRPs, p10 and p11 can be used to configure ptrs-Power. The UE applies a power boost factor of 00 to the first TRP and a power boost factor of 01 to the second TRP when p10 is configured; the UE applies a power boost factor of 01 to the first TRP and a power boost factor of 00 to the second TRP when p11 is configured. An example is shown in Table 4. Another method is to map p10 to TRP0 01, TRP1 00 and p11 to TRP0 00, TRP1 01. TIFF0007813811000010.tif112160TIFF0007813811000011.tif91104

[0144] 2 Detailed explanation 11A and 11B illustrate the operation of a UE 612 and a gNB 602 including two TRPs (TRP 1 and TRP 2) according to some of the embodiments described above. Optional steps are represented by dashed lines / boxes. As shown, the UE 612 reports information to the gNB 602 (step 1100) including: (A) support for PUSCH repetition for multiple TRPs; (B) support for codebook-based PUSCH with fully coherent, partially coherent, or non-coherent UL transmission; (C) support for a maximum number of MIMO layers for PUSCH (e.g., 2 or 4); and (D) a number of PTRS ports required for PUSCH transmission to each TRP. Note that while the UE 612 reports all of the aforementioned information to the gNB 602 in this example, in some embodiments the UE 612 may report only a portion of this information to the gNB 602. The gNB 602 configures the UE 612 to have (A) multiple SRS resource sets, each associated with one TRP, (B) a maximum (e.g., 1 or 2) number of PTRS ports for PUSCH transmission to each TRP, and (C) a maximum number (e.g., 2 or 4) of MIMO layers for the PUSCH (step 1102).

[0145] The gNB 602 sends to the UE 612 a DCI scheduling PUSCH repetitions for multiple TRPs, the DCI including (a) first and second SRI fields (for a non-codebook-based PUSCH, possibly for a codebook-based PUSCH) and / or first and second TPMI fields (for a codebook-based PUSCH), (b) an antenna port field, and (c) a PTRS-DMRS association field (step 1104). Note that various embodiments of this DCI, particularly the use of the PTRS-DMRS association field, are described above, and details of those embodiments are applicable here. The UE 612 receives the DCI and, based on the DCI, determines a first DMRS port associated with the first PTRS port for PUSCH transmission to the first TRP (TRP 1) (step 1106). If the maximum number of PTRS ports is two, the UE 612 also determines a second DMRS port associated with the second PTRS port for PUSCH transmission to the first TRP (step 1108). The UE 612 also determines a third DMRS port associated with the third PTRS port for PUSCH transmission to the second TRP (TRP 2) based on the DCI (step 1110). If the maximum number of PTRS ports is two, the UE 612 also determines a fourth DMRS port associated with the fourth PTRS port for PUSCH transmission to the second TRP (step 1112). The UE 612 transmits the PUSCH to the first TRP (TRP 1) using the first PTRS port and, if applicable, the second PTRS port (step 1114). The UE 612 transmits the PUSCH to the second TRP (TRP 2) using the third PTRS port and, if applicable, the fourth PTRS port (step 1116).

[0146] 12A and 12B illustrate the operation of a UE 612 and a gNB 602 including two TRPs (TRP 1 and TRP 2) according to some other of the embodiments described above. Optional steps are represented by dashed lines / boxes. As shown, the UE 612 reports information to the gNB 602 (step 1200) including: (A) support for PUSCH repetition for multiple TRPs; (B) support for codebook-based PUSCH with fully coherent, partially coherent, or non-coherent UL transmission; (C) support for a maximum number of MIMO layers for PUSCH (e.g., 2 or 4); and (D) a number of PTRS ports required for PUSCH transmission to each TRP. Note that while the UE 612 reports all of the foregoing information to the gNB 602 in this example, in some embodiments the UE 612 may report only a portion of this information to the gNB 602. The gNB 602 configures the UE 612 with (A) multiple SRS resource sets, each associated with one TRP, (B) a maximum number (e.g., 1 or 2) of PTRS ports for PUSCH transmission to each TRP, and (C) a maximum number (e.g., 4) of MIMO layers for the PUSCH (step 1202).

[0147] The gNB 602 sends to the UE 612 a DCI scheduling PUSCH repetitions for multiple TRPs, the DCI including (a) first and second SRI fields (for non-codebook-based PUSCHs, possibly for codebook-based PUSCHs) and / or first and second TPMI fields (for codebook-based PUSCHs), (b) an antenna port field, and (c) first and second PTRS-DMRS association fields (step 1204). Note that various embodiments of this DCI, particularly the use of two PTRS-DMRS association fields, are described above, and details of those embodiments are applicable here. The UE 612 receives the DCI and uses the first PTRS-DMRS association field to determine a 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 two, the UE 612 also determines a second DMRS port associated with the second PTRS port for PUSCH transmission to the first TRP using the first PTRS-DMRS association field (step 1208). The UE 612 also determines a third DMRS port associated with the third PTRS port for PUSCH transmission to the second TRP (TRP 2) using the second PTRS-DMRS association field (step 1210). If the maximum number of PTRS ports is two, the UE 612 also determines a fourth DMRS port associated with the fourth PTRS port for PUSCH transmission to the second TRP using the second PTRS-DMRS association field (step 1212). The UE 612 transmits the PUSCH to the first TRP (TRP 1) using the first PTRS port and, if applicable, the second PTRS port (step 1214). The UE 612 transmits the PUSCH to the second TRP (TRP 2) using the third PTRS port and, if applicable, the fourth PTRS port (step 1216).

[0148] FIG. 13 is a schematic block diagram of a radio access node 1300 according to some embodiments of the present disclosure. Optional functionality is represented by dashed boxes. The radio access node 1300 may be, for example, a base station 602 or 606 or network node that performs all or a portion of the functionality of a base station 602 or gNB described herein, or a TRP or network node that performs at least a portion of the functionality of a TRP described herein. As shown, the radio access node 1300 includes a control system 1302 that includes one or more processors 1304 (e.g., a central processing unit (CPU), an application-specific integrated circuit (ASIC), a 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 circuits. Additionally, the radio access node 1300 may include one or more radio units 1310, each 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, or part of, the radio interface circuitry. In some embodiments, the radio unit 1310 is external to the control system 1302 and is connected to the control system 1302, for example, via a wired connection (e.g., an optical cable). However, in some other embodiments, the radio unit 1310 and potentially the antenna 1316 are integrated with the control system 1302. The one or more processors 1304 operate to provide one or more functions of the radio access node 1300 described herein (e.g., one or more functions of a base station 602 or 606 or gNB described herein, or one or more functions of a TRP or network node that implements at least some of the functions of a TRP described herein). In some embodiments, the functions are implemented in software, for example, stored in the memory 1306 and executed by the one or more processors 1304.

[0149] FIG. 14 is a schematic block diagram illustrating a virtualized embodiment of a radio access node 1300 in accordance with some embodiments of the present disclosure. This description is equally applicable to other types of network nodes. Additionally, other types of network nodes may have similar virtualization architectures. Again, optional functionality is represented by dashed boxes. As used herein, a “virtualized” radio access node is an implementation of a radio access node 1300 in which at least some of the functionality of the radio access node 1300 is implemented as virtual component(s) (e.g., via virtual machine(s) running on physical processing node(s) in the network). As shown, in this example, the radio access node 1300 may include a control system 1302 and / or one or more radio units 1310, as described above. The control system 1302 may be connected to the radio unit 1310, for example, via an optical cable or the like. The radio access node 1300 includes one or more processing nodes 1400 coupled to or included as part of a network 1402. If present, the control system 1302 or wireless unit is connected to processing nodes 1400 via a network 1402. Each processing node 1400 includes one or more processors 1404 (e.g., CPU, ASIC, FPGA, etc.), memory 1406, and a network interface 1408.

[0150] In this example, the functions 1410 of the radio access node 1300 described herein (e.g., one or more functions of a base station 602 or 606 or gNB described herein, or one or more functions of a TRP or network node that implements at least some of the functions of a TRP described herein) are implemented in one or more processing nodes 1400 or are distributed across one or more processing nodes 1400 and control system 1302 and / or radio unit 1310 in any desired manner. In some particular 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 a virtual environment hosted by the processing node 1400. As will be appreciated by those skilled in the art, additional signaling or communication between the processing node 1400 and the control system 1302 is used to implement at least some of the desired functions 1410. Notably, in some embodiments, the control system 1302 may not be included, in which case the radio unit 1310 communicates directly with the processing node 1400 via an appropriate network interface.

[0151] In some embodiments, a computer program is provided that includes instructions that, when executed by at least one processor, cause the at least one processor to perform functions of the radio access node 1300 or a node (e.g., processing node 1400) that implement one or more of the functions 1410 of the radio access node 1300 in a virtual environment according to any of the embodiments described herein. In some embodiments, a carrier is provided that includes the aforementioned computer program product. The carrier is one of an electrical signal, an optical signal, a radio signal, or a computer-readable storage medium (e.g., a non-transitory computer-readable medium such as a memory).

[0152] 15 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 implemented in software. The modules 1500 provide the functionality of the radio access node 1300 described herein (e.g., one or more functions of a base station 602 or 606 or gNB described herein, or one or more functions of a TRP or network node that implements at least a portion of the functionality of a TRP described herein). This description is equally applicable to the processing node 1400 of FIG. 14 , where the modules 1500 may be implemented in one of the processing nodes 1400, or may be distributed across multiple processing nodes 1400, and / or may be distributed across the processing nodes 1400 and the control system 1302.

[0153] 16 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 a wireless communication device 612 or a UE as described herein. As shown, the wireless communication device 1600 includes one or more processors 1602 (e.g., a CPU, an ASIC, an FPGA, etc.), a memory 1604, and one or more transceivers 1606, each including one or more transmitters 1608 and one or more receivers 1610 coupled to one or more antennas 1612. The transceiver 1606 includes radio front-end circuitry connected to the antenna 1612 configured to condition signals communicated between the antenna 1612 and the processor 1602, as will be understood by those skilled in the art. The processor 1602 may also be referred to herein as a processing circuit. The transceiver 1606 may also be referred to herein as a radio circuit. In some embodiments, the functionality of the wireless communication device 1600 described above (e.g., one or more functions of the wireless communication device 612 or UE) may be implemented, for example, fully or partially, in software stored in memory 1604 and executed by processor(s) 1602. Note that the wireless communication device 1600 may include additional components not shown in FIG. 16 , such as, for example, one or more user interface components (e.g., input / output interfaces including a display, buttons, touchscreen, microphone, speaker, etc., and / or any other components for enabling input of information into and / or output of information from the wireless communication device 1600, a power source (e.g., a battery and associated power circuitry), etc.

[0154] In some embodiments, a computer program is provided that includes instructions that, when executed by at least one processor, cause the at least one processor to perform the functions of the wireless communication device 1600 (e.g., one or more functions of the wireless communication device 612 or a UE) according to any of the embodiments described herein. In some embodiments, a carrier is provided that includes the aforementioned computer program product. The carrier is one of an electrical signal, an optical signal, a radio signal, or a computer-readable storage medium (e.g., a non-transitory computer-readable medium such as a memory).

[0155] 17 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 implemented in software. The 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).

[0156] 18 , according to one embodiment, a communications system includes a telecommunications network 1800, such as a 3GPP-type cellular network, comprising an access network 1802, such as a RAN, and a core network 1804. The access network 1802 comprises a plurality of base stations 1806A, 1806B, 1806C, such as Node Bs, eNBs, gNBs, or other types of wireless access points (APs), each defining a corresponding coverage area 1808A, 1808B, 1808C. Each base station 1806A, 1806B, 1806C can be connected to the core network 1804 via a wired or wireless connection 1810. A first UE 1812 located in the coverage area 1808C is configured to wirelessly connect to or be paged by the corresponding base station 1806C. A second UE 1814 within the coverage area 1808A can wirelessly connect to the corresponding base station 1806A. Although multiple UEs 1812, 1814 are shown in this example, the disclosed embodiments are equally applicable to situations where only one UE is within the coverage area or where only one UE is connected to the corresponding base station 1806.

[0157] The telecommunications network 1800 is itself connected to a host computer 1816, which may be embodied in hardware and / or software of a standalone server, a cloud-implemented server, a distributed server, or as a processing resource in a server farm. The 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. The connections 1818 and 1820 between the telecommunications network 1800 and the host computer 1816 may extend directly from the core network 1804 to the host computer 1816 or may go through an optional intermediate network 1822. The intermediate network 1822 may be one of a public, private, or hosted network, or a combination of two or more thereof; the intermediate network 1822, if present, may be a backbone network or the Internet; in particular, the intermediate network 1822 may comprise two or more subnetworks (not shown).

[0158] The communication system of FIG. 18 , as a whole, enables connectivity between the connected UEs 1812, 1814 and a host computer 1816. The connectivity may be described as an over-the-top (OTT) connection 1824. The host computer 1816 and the connected UEs 1812, 1814 are configured to communicate data and / or signals via the OTT connection 1824 using the access network 1802, the core network 1804, any intermediate networks 1822, and possible further infrastructure (not shown) as intermediaries. The OTT connection 1824 may be transparent, in the sense that the participating communication devices through which the OTT connection 1824 passes are unaware of the routing of the uplink and downlink communications. For example, the base station 1806 does not need to be informed or aware of the past routing of incoming downlink communications with data originating from the host computer 1816 to be forwarded (e.g., handed over) to the connected UE 1812. Similarly, the base station 1806 does not need to be aware of the future routing of outgoing uplink communications from the UE 1812 to the host computer 1816 .

[0159] 19, an exemplary embodiment in accordance with the UE, base station, and host computer embodiments discussed in the previous paragraph will now be described. In communication system 1900, host computer 1902 comprises hardware 1904 including communication interface 1906 configured to set up and maintain wired or wireless connections with interfaces of different communication devices of communication system 1900. Host computer 1902 further comprises processing circuitry 1908, which may have storage and / or processing capabilities. In particular, processing circuitry 1908 may comprise one or more programmable processors, ASICs, FPGAs, or combinations thereof (not shown) adapted to execute instructions. Host computer 1902 further comprises software 1910 stored on or accessible by host computer 1902 and executable by processing circuitry 1908. Software 1910 includes host application 1912. The host application 1912 may be operable to provide services to remote users, such as the UE 1914 connecting via an OTT connection 1916 that terminates at the UE 1914 and the host computer 1902. In providing services to the remote users, the host application 1912 may provide user data that is transmitted using the OTT connection 1916.

[0160] The communications system 1900 further includes a base station 1918 provided within the telecommunications system and comprising hardware 1920 that enables communication with the host computer 1902 and the UE 1914. The hardware 1920 may include a communications interface 1922 for setting up and maintaining wired or wireless connections with interfaces of different communications devices of the communications system 1900, and a wireless interface 1924 for setting up and maintaining wireless connections 1926 with UEs 1914 located in a coverage area (not shown in FIG. 19 ) served by the base station 1918. The communications interface 1922 may be configured to facilitate a connection 1928 to the host computer 1902. The connection 1928 may be direct or may pass through a core network of the telecommunications system (not shown in FIG. 19 ) and / or one or more intermediate networks external to the telecommunications system. In the illustrated embodiment, the hardware 1920 of the base station 1918 further includes processing circuitry 1930, which may comprise one or more programmable processors, ASICs, FPGAs, or combinations thereof (not shown) adapted to execute instructions. The base station 1918 also has software 1932 stored internally or accessible via an external connection.

[0161] The communications system 1900 further includes the previously referenced UE 1914. The hardware 1934 of the UE 1914 may include a wireless interface 1936 configured to set up and maintain a wireless connection 1926 with a base station serving the coverage area in which the UE 1914 is currently located. The hardware 1934 of the UE 1914 further includes a processing circuit 1938, which may comprise one or more programmable processors, ASICs, FPGAs, or combinations thereof (not shown) adapted to execute instructions. The UE 1914 further includes software 1940 stored on or accessible by the UE 1914 and executable by the processing circuit 1938. The software 1940 includes a client application 1942. The client application 1942, with support from the host computer 1902, may be operable to provide services to a human or non-human user via the UE 1914. On the host computer 1902, a running host application 1912 can communicate with a running client application 1942 via a UE 1914 and an OTT connection 1916 that terminates at the host computer 1902. In providing a service to a user, the client application 1942 can receive request data from the host application 1912 and provide user data in response to the request data. The OTT connection 1916 can transfer both request data and user data. The client application 1942 can interact with the user to generate the user data that it provides.

[0162] It should be noted that the host computer 1902, base station 1918, and UE 1914 shown in Figure 19 may be similar to or identical to the host computer 1816, one of the base stations 1806A, 1806B, 1806C, and one of the UEs 1812, 1814 of Figure 18, respectively. That is, the internal operation of these entities is as shown in Figure 19, and independently, the surrounding network topology may be that of Figure 18.

[0163] 19, the OTT connection 1916 is depicted abstractly to show communication between the host computer 1902 and the UE 1914 via a base station 1918 without explicitly referencing any intermediate devices, and the precise routing of messages through these devices. The network infrastructure can determine the routing, which can be configured to be hidden from the UE 1914, the service provider operating the host computer 1902, or both. While the OTT connection 1916 is active, the network infrastructure can further decide to dynamically change the routing (e.g., based on load balancing considerations or network reconfiguration).

[0164] The wireless connection 1926 between the UE 1914 and the base station 1918 follows the teachings of the embodiments described throughout this disclosure. One or more of the various embodiments improve the performance of the OTT service provided to the UE 1914 using the OTT connection 1916 of which the wireless connection 1926 forms the last segment.

[0165] Measurement procedures may be provided for the purpose of monitoring data rates, latency, and other factors that one or more embodiments improve. There may further be optional network functionality for reconfiguring the OTT connection 1916 between the host computer 1902 and the UE 1914 in response to fluctuations in the measurement results. The measurement procedures and / or network functionality for reconfiguring the OTT connection 1916 may be implemented in the software 1910 and hardware 1904 of the host computer 1902, or in the software 1940 and hardware 1934 of the 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 passes, and the sensors may participate in the measurement procedures by providing values ​​of the monitored quantities exemplified above, or by providing values ​​of other physical quantities from which the software 1910, 1940 can calculate or estimate the monitored quantities. Reconfiguration of the OTT connection 1916 can include message formats, retransmission settings, preferred routing, etc., and the reconfiguration need not affect the base station 1918 and may be unknown or imperceptible to the base station 1918. Such procedures and functions are known in the art and may be practiced. In particular embodiments, measurements may involve proprietary UE signaling that facilitates measurements of throughput, propagation time, latency, etc. at the host computer 1902. Measurements may be implemented in that the OTT connection 1916 is used to send messages, particularly empty or "dummy" messages, while the software 1910 and 1940 monitors propagation times, errors, etc.

[0166] FIG. 20 is a flowchart illustrating a method implemented in a communications system according to one embodiment. The communications system includes a host computer, a base station, and a UE, which may be as described with reference to FIGS. 18 and 19. To simplify this disclosure, only drawing references to FIG. 20 are included in this section. In step 2000, the host computer provides user data. In sub-step 2002 of step 2000 (which may be optional), the host computer provides the user data by executing a host application. In step 2004, the host computer initiates a transmission carrying the user data to the UE. In step 2006 (which may be optional), the base station transmits the user data carried in the host computer-initiated transmission to the UE, in accordance with the teachings of the embodiments described throughout this disclosure. In step 2008 (which may be optional), the UE executes a client application associated with the host application executed by the host computer.

[0167] FIG. 21 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, which may be as described with reference to FIGS. 18 and 19. To simplify this disclosure, only drawing references to FIG. 21 are included in this section. In step 2100 of the method, the host computer provides user data. In an optional substep (not shown), the host computer provides the user data by executing a host application. In step 2102, the host computer initiates a transmission carrying the user data to the UE. The transmission may pass through the base station in accordance with the teachings of the embodiments described throughout this disclosure. In step 2104 (which may be optional), the UE receives the user data carried in the transmission.

[0168] FIG. 22 is a flowchart illustrating a method implemented in a communications system according to one embodiment. The communications system includes a host computer, a base station, and a UE, which may be as described with reference to FIGS. 18 and 19. To simplify this disclosure, only drawing references to FIG. 22 are included in this section. 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 (which may be optional) of step 2200, the UE provides the user data by executing a client application. In sub-step 2206 (which may be optional) of step 2202, the UE executes the client application, which provides the user data in response to the received input data provided by the host computer. In providing the user data, the executed client application may further consider user input received from the user. Regardless of the particular manner in which the user data is provided, the UE begins transmitting the user data to the host computer in sub-step 2208 (which may be optional). In method step 2210, the host computer receives user data transmitted from the UE according to the teachings of the embodiments described throughout this disclosure.

[0169] Figure 23 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, which may be as described with reference to Figures 18 and 19. To simplify this disclosure, only a drawing reference to Figure 23 is included in this section. In step 2300 (which may be optional), the base station receives user data from the UE in accordance with the teachings of embodiments described throughout this disclosure. In step 2302 (which may be optional), the base station initiates 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 a transmission initiated by the base station.

[0170] Any suitable step, method, feature, function, or benefit disclosed herein may be performed through one or more functional units or modules of one or more virtual devices. Each virtual device may comprise several of these functional units. These functional units may be implemented through one or more microprocessors or microcontrollers, logic processing circuitry, and other digital hardware, such as digital signal processors (DSPs), dedicated digital logic, etc. The processing circuitry may be configured to execute program code stored in memory, which may include one or several 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 implementing one or more telecommunications and / or data communication protocols and instructions for performing one or more of the techniques described herein. In some implementations, processing circuitry may be used to cause each functional unit to perform corresponding functions according to one or more embodiments of the present disclosure.

[0171] Although the processes in the figures may indicate a particular order of operations performed by some embodiments of the present disclosure, it should be understood that such order is exemplary (e.g., alternative embodiments may perform operations in a different order, combine some operations, overlap some operations, etc.).

[0172] Some exemplary embodiments of the present disclosure are as follows.

[0173] <Implementation of Group A> Embodiment 1: A method performed by a wireless communication device, comprising: receiving (1104; 1204) downlink control information (DCI) from a base station, The DCI schedules Physical Uplink Shared Channel (PUSCH) repetitions to two (or more) Transmit / Receive Points (TRPs), DCI Antenna port field, and At least one PTRS-DMRS association field Equipped with Receiving and determining at least one DMRS port associated with at least one PTRS port for PUSCH transmission to the first TRP based on a value of at least one PTRS-DMRS association field included in the DCI (1106-1108; 1206-1208); determining at least one DMRS port associated with at least one PTRS port for PUSCH transmission to a second TRP based on a value of at least one PTRS-DMRS association field included in the DCI (1110-1112; 1210-1212); Transmitting a PUSCH to the first TRP on at least one PTRS port (1114; 1214) for PUSCH transmission to the first TRP; Transmitting a PUSCH to a second TRP on at least one PTRS port for a PUSCH transmission to a first TRP (1116; 1216); A method comprising:

[0174] Embodiment 2: The method of embodiment 1, wherein at least one PTRS-DMRS association field is a single PTRS-DMRS association field.

[0175] Embodiment 3: The method of embodiment 2, wherein the single PTRS-DMRS association field is a 2-bit field.

[0176] Embodiment 4: The method of embodiment 2 or 3, further comprising: Determining at least one DMRS port associated with at least one PTRS port for PUSCH transmission to the first TRP (1106 to 1108) includes determining a first DMRS port associated with the first PTRS port for PUSCH transmission to the first TRP based on a value of a single PTRS-DMRS association field included in the DCI (1106); Determining at least one DMRS port associated with at least one PTRS port for PUSCH transmission to the second TRP (1110 to 1112) includes determining a second DMRS port associated with the second PTRS port for PUSCH transmission to the second TRP based on a value of a single PTRS-DMRS association field included in the DCI (1110); Transmitting the PUSCH to the first TRP (1114) includes transmitting the PUSCH to the first TRP on a first PTRS port associated with the first DMRS port (1114); The method, wherein transmitting the PUSCH to the second TRP (1116) includes transmitting the PUSCH to the second TRP on a second PTRS port associated with the second DMRS port (1116).

[0177] Embodiment 5: The method of embodiment 4, comprising: The single PTRS-DMRS association field is a 2-bit field, the DCI is for a non-codebook-based PUSCH transmission and further comprises a first SRI field and a second SRI field; The most significant bit (MSB) of the single PTRS-DMRS association field is associated with the first SRI field; The least significant bit (LSB) of the single PTRS-DMRS association field is associated with a second SRI field; method.

[0178] Embodiment 6: The method of embodiment 4, comprising: The single PTRS-DMRS association field is a 2-bit field, the DCI is for a codebook-based PUSCH transmission and further comprises a first TPMI field and a second TPMI field; The most significant bit (MSB) of the single PTRS-DMRS association field is associated with the first TPMI field; The least significant bit (LSB) of the single PTRS-DMRS association field is associated with a second TPMI field; method.

[0179] Embodiment 7: The method of embodiment 5 or 6, comprising: The maximum rank for PUSCH transmission is either 2 or 4, an MSB of the single PTRS-DMRS association field indicates one of the first and second DMRS ports indicated in the antenna port field to be associated with the first PTRS port for PUSCH transmission to the first TRP; The LSB of the single PTRS-DMRS association field indicates one of the first and second DMRS ports indicated in the antenna port field that is associated with the second PTRS port for PUSCH transmission to the second TRP; method.

[0180] Embodiment 8: The method of embodiment 5 or 6, comprising: Rank 3 or 4 is indicated in the DCI, an MSB of the single PTRS-DMRS association field indicates one of the first and third DMRS ports indicated in the antenna port field to be associated with the first PTRS port for a PUSCH transmission to the first TRP; The LSB of the single PTRS-DMRS association field indicates one of the first and third DMRS ports indicated in the antenna port field that is associated with the second PTRS port for PUSCH transmission to the second TRP; method.

[0181]

[0023] Embodiment 9: The method of embodiment 2 or 3, wherein the wireless communication device (612) is configured with two PTRS ports per TRP; Determining at least one DMRS port associated with at least one PTRS port for PUSCH transmission to the first TRP (1106-1108) includes: determining a first DMRS port associated with the first PTRS port for PUSCH transmission to the first TRP based on a value of a single PTRS-DMRS association field included in the DCI (1106); determining a second DMRS port associated with a second PTRS port for PUSCH transmission to the first TRP based on a value of a single PTRS-DMRS association field included in the DCI (1108); Including, Determining at least one DMRS port associated with at least one PTRS port for PUSCH transmission to a second TRP (1110-1112) includes: determining a third DMRS port associated with a third PTRS port for PUSCH transmission to a second TRP based on a value of a single PTRS-DMRS association field included in the DCI (1110); determining a fourth DMRS port associated with a fourth PTRS port for PUSCH transmission to a second TRP based on a value of a single PTRS-DMRS association field included in the DCI (1112); Including, Transmitting the PUSCH to the first TRP (1114) includes transmitting the PUSCH to the first TRP (1114), wherein the first PTRS port is associated with the first DMRS port and the second PTRS port is associated with the second DMRS port; Transmitting the PUSCH to the second TRP (1116) includes transmitting the PUSCH to the second TRP (1116), wherein the third PTRS port is associated with the third DMRS port and the fourth PTRS port is associated with the fourth DMRS port; method.

[0182] Embodiment 10: The method of embodiment 9, comprising: The single PTRS-DMRS association field is a 2-bit field, The most significant bit (MSB) of the single PTRS-DMRS association field is associated with the first and third PTRS ports; The least significant bit (LSB) of the single PTRS-DMRS association field is associated with the second and fourth PTRS ports; method.

[0183] Embodiment 11: The method of embodiment 9, comprising: The single PTRS-DMRS association field is a 2-bit field, A single PTRS-DMRS association field applies to only the first TRP or only the second TRP; method.

[0184] Embodiment 12: The method described in embodiment 9, in which the PTRS-DMRS association for other TRPs is predefined.

[0185] Embodiment 13: The method of embodiment 9, comprising: The single PTRS-DMRS association field is a 2-bit field, The most significant bit (MSB) of a single PTRS-DMRS association field is a first DMRS port associated with a first PTRS port from a first DMRS port group; a third DMRS port associated with a third PTRS port from the second DMRS port group; indicates, The least significant bit (LSB) of a single PTRS-DMRS association field is a second DMRS port associated with a second PTRS port from the first DMRS port group; a fourth DMRS port associated with a fourth PTRS port from the second DMRS port group; Showing, how.

[0186] Embodiment 14: The method according to embodiment 13, wherein a first DMRS port is associated with a first PUSCH or SRS port group, and a second DMRS port is associated with a second PUSCH or SRS port group.

[0187] Embodiment 15: The method described in embodiment 1, wherein the at least one PTRS-DMRS association field includes a first PTRS-DMRS association field and a second PTRS-DMRS association field.

[0188] Embodiment 16: The method according to embodiment 15, wherein each of the first and second PTRS-DMRS association fields is a 2-bit field.

[0189] Embodiment 17: The method of embodiment 15 or 16, comprising: Determining at least one DMRS port associated with at least one PTRS port for PUSCH transmission to the first TRP (1206 to 1208) includes determining a first DMRS port associated with the first PTRS port for PUSCH transmission to the first TRP based on a value of a first PTRS-DMRS association field included in the DCI (1206); Determining at least one DMRS port associated with at least one PTRS port for PUSCH transmission to the second TRP (1210 to 1212) includes determining a second DMRS port associated with the second PTRS port for PUSCH transmission to the second TRP based on a value of a second PTRS-DMRS association field included in the DCI (1210); Transmitting the PUSCH to the first TRP (1214) includes transmitting the PUSCH to the first TRP on a first PTRS port associated with the first DMRS port (1214); Transmitting the PUSCH to the second TRP (1216) includes transmitting the PUSCH to the second TRP on a second PTRS port associated with the second DMRS port (1216). method.

[0190]

[0072] Embodiment 18: The method of embodiment 15 or 16, wherein the wireless communication device (612) is configured with two PTRS ports per TRP; Determining at least one DMRS port associated with at least one PTRS port for PUSCH transmission to the first TRP (1206-1208) includes: determining a first DMRS port associated with the first PTRS port for PUSCH transmission to the first TRP based on a value of a first PTRS-DMRS association field included in the DCI (1206); determining a second DMRS port associated with the second PTRS port for PUSCH transmission to the first TRP based on a value of the first PTRS-DMRS association field included in the DCI (1208); Including, Determining at least one DMRS port associated with at least one PTRS port for PUSCH transmission to the second TRP (1210-1212) includes: determining (1210) a third DMRS port associated with a third PTRS port for PUSCH transmission to a second TRP based on a value of a second PTRS-DMRS association field included in the DCI; determining a fourth DMRS port associated with the fourth PTRS port for PUSCH transmission to the second TRP based on a value of a second PTRS-DMRS association field included in the DCI (1212); Including, Transmitting the PUSCH to the first TRP (1214) includes transmitting the PUSCH to the first TRP (1114), wherein the first PTRS port is associated with the first DMRS port and the second PTRS port is associated with the second DMRS port; Transmitting the PUSCH to the second TRP (1216) includes transmitting the PUSCH to the second TRP (1116), wherein the third PTRS port is associated with the third DMRS port and the fourth PTRS port is associated with the fourth DMRS port; method.

[0191] Embodiment 19: A method as described in any one of embodiments 1 to 18, in which PTRS to PUSCH power radio is configured per TRP.

[0192] Embodiment 20: The method of any of the preceding embodiments, further comprising providing user data and transferring the user data to the host computer via transmission to the base station.

[0193] <Implementation of Group B> Embodiment 21: A method performed by a base station, comprising: transmitting (1104; 1204) downlink control information (DCI) to a wireless communication device (612); The DCI schedules Physical Uplink Shared Channel (PUSCH) repetitions to two (or more) Transmit / Receive Points (TRPs), DCI an antenna port field; and at least one PTRS-DMRS association field; Equipped with including transmitting determining at least one DMRS port associated with at least one PTRS port for PUSCH transmission to the first TRP based on a value of at least one PTRS-DMRS association field included in the DCI; The at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the second TRP is based on a value of at least one PTRS-DMRS association field included in the DCI; method.

[0194] Embodiment 22: The method described in embodiment 21, wherein at least one PTRS-DMRS association field is a single PTRS-DMRS association field.

[0195] Embodiment 23: The method described in embodiment 22, wherein the single PTRS-DMRS association field is a 2-bit field.

[0196] Embodiment 24: The method of embodiment 22 or 23, comprising: The first DMRS port associated with the first PTRS port for PUSCH transmission to the first TRP is determined based on the value of a single PTRS-DMRS association field included in the DCI; The second DMRS port associated with the second PTRS port for PUSCH transmission to the second TRP is based on the value of a single PTRS-DMRS association field included in the DCI. method.

[0197] Embodiment 25: The method of embodiment 24, comprising: The single PTRS-DMRS association field is a 2-bit field, the DCI is for a non-codebook-based PUSCH transmission and further comprises a first SRI field and a second SRI field; The most significant bit (MSB) of the single PTRS-DMRS association field is associated with the first SRI field; The least significant bit (LSB) of the single PTRS-DMRS association field is associated with a second SRI field; method.

[0198] Embodiment 26: The method of embodiment 24, comprising: The single PTRS-DMRS association field is a 2-bit field, the DCI is for a codebook-based PUSCH transmission and further comprises a first TPMI field and a second TPMI field; The most significant bit (MSB) of the single PTRS-DMRS association field is associated with the first TPMI field; The least significant bit (LSB) of the single PTRS-DMRS association field is associated with a second TPMI field; method.

[0199] Embodiment 27: The method of embodiment 25 or 26, comprising: The maximum rank for PUSCH transmission is either 2 or 4, an MSB of the single PTRS-DMRS association field indicates one of the first and second DMRS ports indicated in the antenna port field to be associated with the first PTRS port for PUSCH transmission to the first TRP; The LSB of the single PTRS-DMRS association field indicates one of the first and second DMRS ports indicated in the antenna port field that is associated with the second PTRS port for PUSCH transmission to the second TRP; method.

[0200] Embodiment 28: The method of embodiment 25 or 26, comprising: Rank 3 or 4 is indicated in the DCI, an MSB of the single PTRS-DMRS association field indicates one of the first and third DMRS ports indicated in the antenna port field to be associated with the first PTRS port for a PUSCH transmission to the first TRP; The LSB of the single PTRS-DMRS association field indicates one of the first and third DMRS ports indicated in the antenna port field to be associated with the second PTRS port for PUSCH transmission to the second TRP; method.

[0201]

[0082] Embodiment 29: The method of embodiment 22 or 23, wherein the wireless communication device (612) is configured with two PTRS ports per TRP; At least one DMRS port associated with at least one PTRS port for PUSCH transmission to the first TRP is a first DMRS port associated with a first PTRS port for PUSCH transmission to a first TRP based on a value of a single PTRS-DMRS association field included in the DCI; and a second DMRS port associated with a second PTRS port for PUSCH transmission to the first TRP based on the value of a single PTRS-DMRS association field included in the DCI; and Including, at least one DMRS port associated with at least one PTRS port for PUSCH transmission to the second TRP; a third DMRS port associated with a third PTRS port for PUSCH transmission to the second TRP based on the value of the single PTRS-DMRS association field included in the DCI; and a fourth DMRS port associated with a fourth PTRS port for PUSCH transmission to the second TRP based on the value of the single PTRS-DMRS association field included in the DCI; and A method comprising:

[0202] Embodiment 30: The method of embodiment 29, comprising: The single PTRS-DMRS association field is a 2-bit field, The most significant bit (MSB) of the single PTRS-DMRS association field is associated with the first and third PTRS ports; A method in which the least significant bits (LSBs) of the single PTRS-DMRS association field are associated with the second and fourth PTRS ports.

[0203] Embodiment 31: The method of embodiment 29, comprising: The single PTRS-DMRS association field is a 2-bit field, A single PTRS-DMRS association field applies to only the first TRP or only the second TRP; method.

[0204] Embodiment 32: The method described in embodiment 31, in which PTRS-DMRS associations for other TRPs are predefined.

[0205] Embodiment 33: The method of embodiment 29, comprising: The single PTRS-DMRS association field is a 2-bit field, The most significant bit (MSB) of a single PTRS-DMRS association field is a first DMRS port associated with a first PTRS port from a first DMRS port group; a third DMRS port associated with a third PTRS port from the second DMRS port group; indicates, The least significant bit (LSB) of a single PTRS-DMRS association field is a second DMRS port associated with a second PTRS port from the first DMRS port group; a fourth DMRS port associated with a fourth PTRS port from the second DMRS port group; Showing, method.

[0206] Embodiment 34: The method of embodiment 33, wherein a first DMRS port is associated with a first PUSCH or SRS port group, and a second DMRS port is associated with a second PUSCH or SRS port group.

[0207] Embodiment 35: The method of embodiment 21, wherein the at least one PTRS-DMRS association field includes a first PTRS-DMRS association field and a second PTRS-DMRS association field.

[0208] Embodiment 36: The method of embodiment 35, wherein each of the first and second PTRS-DMRS association fields is a 2-bit field.

[0209] Embodiment 37: The method of embodiment 35 or 36, comprising: the at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the first TRP comprises a first DMRS port associated with the first PTRS port for PUSCH transmission to the first TRP based on a value of a first PTRS-DMRS association field included in the DCI; The at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the second TRP comprises a second DMRS port associated with the second PTRS port for PUSCH transmission to the second TRP based on a value of a second PTRS-DMRS association field included in the DCI. method.

[0210]

[0082] Embodiment 38: The method of embodiment 35 or 36, wherein the wireless communication device (612) is configured with two PTRS ports per TRP; At least one DMRS port associated with at least one PTRS port for PUSCH transmission to the first TRP is a first DMRS port associated with the first PTRS port for PUSCH transmission to the first TRP based on a value of a first PTRS-DMRS association field included in the DCI; and a second DMRS port associated with the second PTRS port for PUSCH transmission to the first TRP based on a value of the first PTRS-DMRS association field included in the DCI; and Including, at least one DMRS port associated with at least one PTRS port for PUSCH transmission to the second TRP; a third DMRS port associated with the third PTRS port for PUSCH transmission to the second TRP based on a value of a second PTRS-DMRS association field included in the DCI; and a fourth DMRS port associated with the fourth PTRS port for PUSCH transmission to the second TRP based on a value of a second PTRS-DMRS association field included in the DCI; and A method comprising:

[0211] Embodiment 39: A method as described in any one of embodiments 21 to 38, in which PTRS to PUSCH power radio is configured per TRP.

[0212] Embodiment 40: The method according to any of the preceding embodiments, further comprising obtaining user data and transferring the user data to a host computer or a wireless communication device.

[0213] <Implementation of Group C> Embodiment 41: A wireless communication device comprising a processing circuit configured to perform any of the steps of any of the embodiments of group A, and a power supply circuit configured to supply power to the wireless communication device.

[0214] Embodiment 42: A base station comprising a processing circuit configured to perform any of the steps of any of the embodiments of group B, and a power supply circuit configured to provide power to the base station.

[0215] Embodiment 43: User equipment (UE) comprising: an antenna configured to transmit and receive wireless signals; a radio front-end circuit connected to the antenna and the processing circuit and configured to condition signals communicated between the antenna and the processing circuit; a processing circuit configured to perform any of the steps of any of the embodiments of Group A; an input interface connected to the processing circuit and configured to enable input of information to the UE to be processed by the processing circuit; an output interface connected to the processing circuit and configured to output information from the UE processed by the processing circuit; and a battery connected to the processing circuit and configured to provide power to the UE.

[0216] Embodiment 44: A communications system including a host computer having a processing circuit configured to provide user data and a communications interface configured to forward the user data to a cellular network for transmission to user equipment (UE), the cellular network including a base station having a wireless interface and a processing circuit, the processing circuit of the base station configured to perform any of the steps of any of the Group B embodiments.

[0217] Embodiment 45: The communication system of the previous embodiment, further comprising a base station.

[0218] Embodiment 46: The communication system of the preceding two embodiments, further including a UE, wherein the UE is configured to communicate with the base station.

[0219] Embodiment 47: The communication system of the preceding three embodiments, wherein the processing circuitry of the host computer is configured to execute a host application and thereby provide user data, and the UE comprises processing circuitry configured to execute a client application associated with the host application.

[0220] Embodiment 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 at the host computer carrying the user data to the UE via a cellular network including the base station, wherein the base station performs any of the steps of any of the embodiments of Group B.

[0221] Embodiment 49: The method of the previous embodiment, further comprising, at the base station, transmitting user data.

[0222] Embodiment 50: The method of the two preceding embodiments, wherein the user data is provided in the host computer by executing a host application, and further includes executing, in the UE, a client application associated with the host application.

[0223] Embodiment 51: A user equipment (UE) configured to communicate with a base station, the UE comprising a radio interface and a processing circuit configured to perform the methods of the previous three embodiments.

[0224] Embodiment 52: A communications system including a host computer having a processing circuit configured to provide user data and a communications interface configured to transfer the user data to a cellular network for transmission to a user equipment (UE), the UE having a wireless interface and a processing circuit, and components of the UE configured to perform any of the steps of any of the embodiments of Group A.

[0225] Embodiment 53: The communication system of any preceding embodiment, wherein the cellular network further includes a base station configured to communicate with the UE.

[0226] Embodiment 54: The communication system of the two preceding embodiments, wherein the processing circuitry of the host computer is configured to execute a host application and thereby provide user data, and the processing circuitry of the UE is configured to execute a client application associated with the host application.

[0227] Embodiment 55: A method implemented in a communication system including a host computer, a base station, and a user equipment (UE), comprising: providing user data at the host computer; and initiating a transmission at the host computer carrying the user data to the UE via a cellular network including the base station, wherein the UE performs any of the steps of any of the embodiments of Group A.

[0228] Embodiment 56: The method of the previous embodiment, further comprising, in the UE, receiving user data from the base station.

[0229] Embodiment 57: A communications system including a host computer having a communications interface configured to receive user data originating from a transmission from a user equipment (UE) to a base station, the UE having a radio interface and processing circuitry, the processing circuitry of the UE configured to perform any of the steps of any of the embodiments of Group A.

[0230] Embodiment 58: The communication system of the previous embodiment, further including a UE.

[0231] Embodiment 59: The communication system of the previous two embodiments, further including a base station, the base station comprising a wireless interface configured to communicate with the UE and a communication interface configured to transfer user data carried by transmissions from the UE to the base station to a host computer.

[0232] Embodiment 60: The communication system of the preceding three embodiments, wherein the processing circuitry of the host computer is configured to execute a host application and the processing circuitry of the UE is configured to execute a client application associated with the host application, thereby providing user data.

[0233] Embodiment 61: The communication system of the previous four embodiments, wherein the processing circuitry of the host computer is configured to execute a host application and thereby provide the requested data, and the processing circuitry of the UE is configured to execute a client application associated with the host application and thereby provide the user data in response to the requested data.

[0234] Embodiment 62: A method implemented in a communication system including a host computer, a base station, and a user equipment (UE), comprising receiving, at the host computer, user data transmitted from the UE to the base station, wherein the UE performs any of the steps of any of the embodiments of Group A.

[0235] Embodiment 63: The method of the previous embodiment, further comprising, in the UE, providing user data to the base station.

[0236] Embodiment 64: The method of the previous two embodiments, further comprising: executing, in the UE, a client application, thereby providing user data to be transmitted; and executing, in the host computer, a host application associated with the client application.

[0237] Embodiment 65: The method of the previous three embodiments, further comprising: executing a client application in the UE; and receiving input data for the client application in the UE, wherein the input data is provided in the host computer by executing a host application associated with the client application, and the user data to be transmitted is provided by the client application in response to the input data.

[0238] Embodiment 66: A communications system including a host computer having a communications interface configured to receive user data originating from a transmission from a user equipment (UE) to a base station, the base station having a wireless interface and processing circuitry, the processing circuitry of the base station configured to perform any of the steps of any of the Group B embodiments.

[0239] Embodiment 67: The communication system of the previous embodiment, further comprising a base station.

[0240] Embodiment 68: The communication system of the preceding two embodiments, further including a UE, wherein the UE is configured to communicate with a base station.

[0241] Embodiment 69: The communication system of the previous three embodiments, 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.

[0242] Embodiment 70: A method implemented in a communication system including a host computer, a base station, and user equipment (UE), comprising receiving, at the host computer, from the base station, user data derived from a transmission received by the base station from the UE, wherein the UE performs any step of any of the embodiments of Group A.

[0243] Embodiment 71: The method of the previous embodiment, further comprising receiving, at the base station, user data from the UE.

[0244] Embodiment 72: The method of the previous two embodiments, further comprising initiating, at the base station, transmission of the received user data to the host computer.

[0245] Those skilled in the art will recognize improvements and modifications to the embodiments of the present disclosure, and all such improvements and modifications are considered to be within the scope of the concepts disclosed herein.

Claims

1. A method performed by a wireless communication device (612), comprising: Receiving downlink control information (DCI) from a base station (1104; 1204), the DCI schedules physical uplink shared channel (PUSCH) repetitions to one or more transmission / reception points (TRPs), 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; The DCI is an antenna port field indicating two or more demodulation reference signal (DMRS) ports; first and second SRS resource indicator (SRI) fields and / or first and second transmit precoding matrix indicator (TPMI) fields; two PTRS-DMRS association fields, a first and a second PTRS-DMRS association field each having two bits; Including, Receiving and When the DCI schedules PUSCH repetitions for two TRPs, determining at least one DMRS port associated with at least one PTRS port for PUSCH transmission to a first TRP, the first TRP being associated with the first SRS resource set, based on the first PTRS-DMRS association field included in the DCI (1106-1108; 1206-1208); When the DCI schedules PUSCH repetitions for two TRPs, determining at least one DMRS port associated with at least one PTRS port for PUSCH transmission to a second TRP, the second TRP being associated with the second SRS resource set, based on the second PTRS-DMRS association field included in the DCI (1110-1112; 1210-1212); When the DCI schedules a PUSCH repetition for the first or second TRP, determining at least one DMRS port associated with at least one PTRS port for PUSCH transmission to the first or second TRP based on the first PTRS-DMRS association field if the PUSCH repetition is associated with the first SRI field, or based on the second PTRS-DMRS association field if the PUSCH repetition is associated with the second SRI field; For PUSCH transmission to the first TRP, transmitting a first PUSCH repetition to the first TRP on the at least one PTRS port (1114; 1214); Transmitting a second PUSCH repetition to the second TRP on the at least one PTRS port for PUSCH transmission to the second TRP (1116; 1216); Including, the first PTRS-DMRS association field is associated with the first SRI field in the DCI, and the second PTRS-DMRS association field 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, 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; The wireless communication device (612) is configured with two PTRS ports per TRP; Determining the at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the first TRP (1106-1108) includes: determining a first DMRS port associated with a first PTRS port for PUSCH transmission to the first TRP based on a value of the first PTRS-DMRS association field included in the DCI (1106); determining a second DMRS port associated with a second PTRS port for PUSCH transmission to the first TRP based on the first PTRS-DMRS association field included in the DCI (1108); Including, Determining the at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the second TRP (1110-1112) includes: determining a third DMRS port associated with a third PTRS port for PUSCH transmission to the second TRP based on a most significant bit (MSB) of the second PTRS-DMRS association field included in the DCI (1110); determining a fourth DMRS port associated with a fourth PTRS port for PUSCH transmission to the second TRP based on the value of the second PTRS-DMRS association field included in the DCI (1112); Including, Transmitting the first PUSCH repetition to the first TRP (1114) includes transmitting the first PUSCH repetition to the first TRP on the first PTRS port associated with the first DMRS port and on the second PTRS port associated with the second DMRS port (1114); Transmitting the second PUSCH repetition to the second TRP (1116) includes transmitting the second PUSCH repetition to the second TRP on the third PTRS port associated with the third DMRS port and the fourth PTRS port associated with the fourth DMRS port (1116); the DCI comprises two PTRS-DMRS association fields, the first and second PTRS-DMRS association fields each having two bits; The MSB of the first PTRS-DMRS association field is the first DMRS port associated with the first PTRS port from a first DMRS port group; indicates, The least significant bit (LSB) of the first PTRS-DMRS association field is the second DMRS port associated with the second PTRS port from a second DMRS port group; indicates, The MSB of the second PTRS-DMRS association field is the third DMRS port associated with the third PTRS port from the first DMRS port group; indicates, The least significant bit of the second PTRS-DMRS association field is: the fourth DMRS port associated with the fourth PTRS port from the second DMRS port group; Showing, method.

2. 10. The method of claim 1, the DCI comprises two PTRS-DMRS association fields, the first and second PTRS-DMRS association fields each having two 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. method.

3. 10. The method of claim 1, the DCI comprises two PTRS-DMRS association fields, the first and second PTRS-DMRS association fields each having two bits; The first PTRS-DMRS association field is associated with the first SRS resource set associated with the first TRP, and the second PTRS-DMRS association field is associated with the second SRS resource set 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. method.

4. 10. The method of claim 1, the DCI comprises two PTRS-DMRS association fields, the first and second PTRS-DMRS association fields each having two bits; the DCI is for a non-codebook-based PUSCH transmission and further comprises a first SRI field and a second SRI field; the first PTRS-DMRS association field is associated with the first SRI field; the second PTRS-DMRS association field is associated with the second SRI field; method.

5. 10. The method of claim 1, the DCI comprises two PTRS-DMRS association fields, the first and second PTRS-DMRS association fields each having two bits; the first PTRS-DMRS association field is associated with the first TPMI field of the DCI associated with the first TRP; The second PTRS-DMRS association field is associated with the second TPMI field of the DCI associated with the second TRP; method.

6. 10. The method of claim 1, the DCI comprises two PTRS-DMRS association fields, the first and second PTRS-DMRS association fields each having two bits; the DCI is for a codebook-based PUSCH transmission and further comprises a first TPMI field and a second TPMI field; the first PTRS-DMRS association field is associated with the first TPMI field; the second PTRS-DMRS association field is associated with the second TPMI field; method.

7. 10. The method of claim 1, Determining the at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the first TRP (1106-1108) comprises determining a first DMRS port associated with a first PTRS port for PUSCH transmission to the first TRP based on the first PTRS-DMRS association field included in the DCI (1106); Determining the at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the second TRP (1110-1112) comprises determining a second DMRS port associated with a second PTRS port for PUSCH transmission to the second TRP based on the second PTRS-DMRS association field included in the DCI (1110); Transmitting the first PUSCH repetition to the first TRP (1114) includes transmitting the first PUSCH repetition to the first TRP on the first PTRS port associated with the first DMRS port (1114); Transmitting the second PUSCH repetition to the second TRP (1116) includes transmitting the second PUSCH repetition to the second TRP on the second PTRS port associated with the second DMRS port (1116). method.

8. 10. The method of claim 1, The first PTRS-DMRS association field indicates one of up to four DMRS ports indicated in the antenna port field to be associated with the first PTRS port for the PUSCH transmission to the first TRP; The second PTRS-DMRS association field indicates one of up to four DMRS ports indicated in the antenna port field to be associated with the first PTRS port for the PUSCH transmission to the second TRP; method.

9. 2. The method of claim 1, wherein the first DMRS port is associated with a first PUSCH or SRS port group that shares PT-RS port 0, and the second DMRS port is associated with a second PUSCH or SRS port group that shares PT-RS port 1.

10. 1. A wireless communication device, comprising: Receiving downlink control information (DCI) from a base station (1104; 1204), the DCI schedules physical uplink shared channel (PUSCH) repetitions to one or more transmission / reception points (TRPs), 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; The DCI is an antenna port field indicating two or more demodulation reference signal (DMRS) ports; first and second SRS resource indicator (SRI) fields, and / or first and second transmit precoding matrix indicator (TPMI) fields; two PTRS-DMRS association fields, which are first and second PTRS-DMRS association fields each having two bits; Equipped with Receive, When the DCI schedules PUSCH repetitions for two TRPs, determine (1106-1108; 1206-1208) at least one DMRS port associated with at least one PTRS port for PUSCH transmission to a first TRP, the first TRP being associated with the first SRS resource set, based on a value of the first PTRS-DMRS association field included in the DCI; When the DCI schedules PUSCH repetitions for two TRPs, determining (1110-1112; 1210-1212) at least one DMRS port associated with at least one PTRS port for PUSCH transmissions for a second TRP, the second TRP being associated with the second SRS resource set, based on a value of the second PTRS-DMRS association field included in the DCI; When the DCI schedules a PUSCH repetition for the first or second TRP, determine at least one DMRS port associated with at least one PTRS port for a PUSCH transmission to the first or second TRP based on the first PTRS-DMRS association field if the PUSCH repetition is associated with the first SRI field, or based on the second PTRS-DMRS association field if the PUSCH repetition is associated with the second SRI field; Transmitting (1114; 1214) a first PUSCH repetition for the first TRP on the at least one PTRS port for PUSCH transmission to the first TRP; transmitting (1116; 1216) a second PUSCH repetition to the second TRP on the at least one PTRS port for PUSCH transmission to the second TRP; It is adapted to the first PTRS-DMRS association field is associated with the first SRI field in the DCI, and the second PTRS-DMRS association field is associated with a second SRI field in the DCI; or the first PTRS-DMRS association field is associated with a first SRS resource set, the second PTRS-DMRS association field is associated with a second SRS resource set, 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; The wireless communication device (612) is configured with two PTRS ports per TRP; Determining the at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the first TRP (1106-1108) includes: determining a first DMRS port associated with a first PTRS port for PUSCH transmission to the first TRP based on a value of the first PTRS-DMRS association field included in the DCI (1106); determining a second DMRS port associated with a second PTRS port for PUSCH transmission to the first TRP based on the first PTRS-DMRS association field included in the DCI (1108); Including, Determining the at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the second TRP (1110-1112) includes: determining a third DMRS port associated with a third PTRS port for PUSCH transmission to the second TRP based on a most significant bit (MSB) of the second PTRS-DMRS association field included in the DCI (1110); determining a fourth DMRS port associated with a fourth PTRS port for PUSCH transmission to the second TRP based on the value of the second PTRS-DMRS association field included in the DCI (1112); Including, Transmitting the first PUSCH repetition to the first TRP (1114) includes transmitting the first PUSCH repetition to the first TRP on the first PTRS port associated with the first DMRS port and on the second PTRS port associated with the second DMRS port (1114); Transmitting the second PUSCH repetition to the second TRP (1116) includes transmitting the second PUSCH repetition to the second TRP on the third PTRS port associated with the third DMRS port and the fourth PTRS port associated with the fourth DMRS port (1116); the DCI comprises two PTRS-DMRS association fields, the first and second PTRS-DMRS association fields each having two bits; The MSB of the first PTRS-DMRS association field is the first DMRS port associated with the first PTRS port from a first DMRS port group; indicates, The least significant bit (LSB) of the first PTRS-DMRS association field is the second DMRS port associated with the second PTRS port from a second DMRS port group; indicates, The MSB of the second PTRS-DMRS association field is the third DMRS port associated with the third PTRS port from the first DMRS port group; indicates, The least significant bit of the second PTRS-DMRS association field is: the fourth DMRS port associated with the fourth PTRS port from the second DMRS port group; Showing, Wireless communication devices.

11. A wireless communication device according to claim 10, further adapted to perform the method according to any one of claims 2 to 9.

12. 1. A wireless communication device, comprising: one or more transmitters; one or more receivers; a processing circuit associated with the one or more transmitters and the one or more receivers, in a wireless communication device; receiving (1104; 1204) downlink control information (DCI) from a base station, the DCI schedules physical uplink shared channel (PUSCH) repetitions to one or more transmission / reception points (TRPs), 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; The DCI is an antenna port field indicating two or more demodulation reference signal (DMRS) ports; first and second SRS resource indicator (SRI) fields and / or first and second transmit precoding matrix indicator (TPMI) fields; two PTRS-DMRS association fields, a first and a second PTRS-DMRS association field each having two bits; Including, Let it receive, When the DCI schedules PUSCH repetitions for two TRPs, determining (1106-1108; 1206-1208) at least one DMRS port associated with at least one PTRS port for PUSCH transmission to a first TRP, the first TRP being associated with the first SRS resource set, based on a value of the first PTRS-DMRS association field included in the DCI; When the DCI schedules PUSCH repetitions for two TRPs, determining (1110-1112; 1210-1212) at least one DMRS port associated with at least one PTRS port for PUSCH transmission to a second TRP, the second TRP being associated with the second SRS resource set, based on a value of the second PTRS-DMRS association field included in the DCI; determining, when the DCI schedules a PUSCH repetition for the first or second TRP, at least one DMRS port associated with at least one PTRS port for a PUSCH transmission to the first or second TRP based on the first PTRS-DMRS association field if the PUSCH repetition is associated with the first SRI field, or based on the second PTRS-DMRS association field if the PUSCH repetition is associated with the first SRI field; transmitting (1114; 1214) a first PUSCH repetition for the first TRP on the at least one PTRS port for PUSCH transmission to the first TRP; transmitting (1116; 1216) a second PUSCH repetition to the second TRP on the at least one PTRS port for PUSCH transmission to the second TRP; a processing circuit configured to the first PTRS-DMRS association field is associated with the first SRI field in the DCI, and the second PTRS-DMRS association field 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, the second PTRS-DMRS association field is associated with a second SRS resource set, 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; The wireless communication device (612) is configured with two PTRS ports per TRP; Determining the at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the first TRP (1106-1108) includes: determining a first DMRS port associated with a first PTRS port for PUSCH transmission to the first TRP based on a value of the first PTRS-DMRS association field included in the DCI (1106); determining a second DMRS port associated with a second PTRS port for PUSCH transmission to the first TRP based on the first PTRS-DMRS association field included in the DCI (1108); Including, Determining the at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the second TRP (1110-1112) includes: determining a third DMRS port associated with a third PTRS port for PUSCH transmission to the second TRP based on a most significant bit (MSB) of the second PTRS-DMRS association field included in the DCI (1110); determining a fourth DMRS port associated with a fourth PTRS port for PUSCH transmission to the second TRP based on the value of the second PTRS-DMRS association field included in the DCI (1112); Including, Transmitting the first PUSCH repetition to the first TRP (1114) includes transmitting the first PUSCH repetition to the first TRP on the first PTRS port associated with the first DMRS port and on the second PTRS port associated with the second DMRS port (1114); Transmitting the second PUSCH repetition to the second TRP (1116) includes transmitting the second PUSCH repetition to the second TRP on the third PTRS port associated with the third DMRS port and the fourth PTRS port associated with the fourth DMRS port (1116); the DCI comprises two PTRS-DMRS association fields, the first and second PTRS-DMRS association fields each having two bits; The MSB of the first PTRS-DMRS association field is the first DMRS port associated with the first PTRS port from a first DMRS port group; indicates, The least significant bit (LSB) of the first PTRS-DMRS association field is the second DMRS port associated with the second PTRS port from a second DMRS port group; indicates, The MSB of the second PTRS-DMRS association field is the third DMRS port associated with the third PTRS port from the first DMRS port group; indicates, The least significant bit of the second PTRS-DMRS association field is: the fourth DMRS port associated with the fourth PTRS port from the second DMRS port group; Showing, Wireless communication devices.

13. 13. A wireless communication device according to claim 12, wherein the processing circuitry is further configured to cause the wireless communication device to perform a method according to any one of claims 2 to 9.

14. 1. A method performed by a wireless communication device, comprising: receiving (1104; 1204) downlink control information (DCI) from a base station, the DCI scheduling a physical uplink shared channel (PUSCH) repetition to two transmission / reception points (TRPs); The DCI is an antenna port field indicating two or more demodulation reference signal (DMRS) ports; a first phase tracking reference signal (PTRS-DMRS) association field to a demodulation reference signal and a second PTRS-DMRS association field, each of which is a 2-bit field; Equipped with Receiving and determining at least one DMRS port associated with at least one PTRS port for PUSCH transmission to a first TRP based on a value of at least one PTRS-DMRS association field included in the DCI (1106-1108; 1206-1208); determining at least one DMRS port associated with at least one PTRS port for PUSCH transmission to a second TRP based on a value of at least one PTRS-DMRS association field included in the DCI (1110-1112; 1210-1212); Transmitting a first PUSCH repetition to the first TRP on at least one PTRS port for PUSCH transmission to the first TRP (1114; 1214); Transmitting a second PUSCH repetition to the second TRP on at least one PTRS port for PUSCH transmission to the second TRP (1116; 1216); Including, The maximum rank is 4, and the first PTRS-DMRS association field is associated with a first sounding reference signal (SRS) that is a resource set associated with the first TRP, and the second PTRS-DMRS association field is associated with a second SRS resource set associated with the second TRP; or the first PTRS-DMRS association field is associated with a first transmit precoding matrix indicator (TPMI) field in the DCI associated with the first TRP, and the second PTRS-DMRS association field is associated with a second TPMI field in the DCI associated with the second TRP; or Two PT-RS ports are configured per TRP, 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 a first SRS resource indicator (SRI) field in the DCI associated with the first TRP, and the second SRS resource set is associated with a second SRI field in the DCI associated with the second TRP; The wireless communication device (612) is configured with two PTRS ports per TRP; Determining the at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the first TRP (1106-1108) includes: determining a first DMRS port associated with a first PTRS port for PUSCH transmission to the first TRP based on a value of the first PTRS-DMRS association field included in the DCI (1106); determining a second DMRS port associated with a second PTRS port for PUSCH transmission to the first TRP based on the first PTRS-DMRS association field included in the DCI (1108); Including, Determining the at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the second TRP (1110-1112) includes: determining a third DMRS port associated with a third PTRS port for PUSCH transmission to the second TRP based on a most significant bit (MSB) of the second PTRS-DMRS association field included in the DCI (1110); determining a fourth DMRS port associated with a fourth PTRS port for PUSCH transmission to the second TRP based on the value of the second PTRS-DMRS association field included in the DCI (1112); Including, Transmitting the first PUSCH repetition to the first TRP (1114) includes transmitting the first PUSCH repetition to the first TRP on the first PTRS port associated with the first DMRS port and on the second PTRS port associated with the second DMRS port (1114); Transmitting the second PUSCH repetition to the second TRP (1116) includes transmitting the second PUSCH repetition to the second TRP on the third PTRS port associated with the third DMRS port and the fourth PTRS port associated with the fourth DMRS port (1116); the DCI comprises two PTRS-DMRS association fields, the first and second PTRS-DMRS association fields each having two bits; The MSB of the first PTRS-DMRS association field is the first DMRS port associated with the first PTRS port from a first DMRS port group; indicates, The least significant bit (LSB) of the first PTRS-DMRS association field is the second DMRS port associated with the second PTRS port from a second DMRS port group; indicates, The MSB of the second PTRS-DMRS association field is the third DMRS port associated with the third PTRS port from the first DMRS port group; indicates, The least significant bit of the second PTRS-DMRS association field is: the fourth DMRS port associated with the fourth PTRS port from the second DMRS port group; Showing, method.

15. A method as described in claim 14, wherein the maximum rank is 4, the first PTRS-DMRS association field is associated with the first SRS resource set associated with the first TRP, and the second PTRS-DMRS association field is associated with the second SRS resource set associated with the second TRP.

16. A method as described in claim 14, wherein the first PTRS-DMRS association field is associated with the first TPMI field in the DCI associated with the first TRP, and the second PTRS-DMRS association field is associated with the second TPMI field in the DCI associated with the second TRP.

17. A method as described in claim 14, wherein two PT-RS ports are configured for each TRP, 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 associated with the first TRP, and the second SRS resource set is associated with the second SRI field in the DCI associated with the second TRP.

18. A method as described in claim 14, wherein the PTRS to PUSCH power ratio is configured for each TRP.

19. 1. A wireless communication device, comprising: receiving (1104; 1204) downlink control information (DCI) from a base station, the DCI scheduling a physical uplink shared channel (PUSCH) repetition to two transmission / reception points (TRPs); The DCI is an antenna port field indicating two or more demodulation reference signal (DMRS) ports; a first phase tracking reference signal to demodulation reference signal (PTRS-DMRS) association field and a second PTRS-DMRS association field, each of which is a 2-bit field; Equipped with Receiving and determining at least one DMRS port associated with at least one PTRS port for PUSCH transmission to a first TRP based on a value of at least one PTRS-DMRS association field included in the DCI (1106-1108; 1206-1208); determining at least one DMRS port associated with at least one PTRS port for PUSCH transmission to a second TRP based on a value of the at least one PTRS-DMRS association field included in the DCI (1110-1112; 1210-1212); Transmitting a first PUSCH repetition to the first TRP on at least one PTRS port for PUSCH transmission to the first TRP (1114; 1214); For a PUSCH transmission to the first TRP, transmitting a second PUSCH repetition on at least one PTRS port to the second TRP (1116; 1216); Including, The maximum rank is 4, the first PTRS-DMRS association field is associated with a first sounding reference signal (SRS) resource set associated with the first TRP, and the second PTRS-DMRS association field is associated with a second SRS resource set associated with the second TRP; The first PTRS-DMRS association field is associated with a first transmit precoding matrix indicator (TPMI) field in the DCI associated with the first TRP, and the second PTRS-DMRS association field is associated with a second TPMI field in the DCI associated with the second TRP; Two PT-RS ports are configured per TRP, 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 a first SRS resource indicator (SRI) field in the DCI associated with the first TRP, and the second SRS resource set is associated with a second SRI field in the DCI associated with the second TRP; The wireless communication device (612) is configured with two PTRS ports per TRP; Determining the at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the first TRP (1106-1108) includes: determining a first DMRS port associated with a first PTRS port for PUSCH transmission to the first TRP based on a value of the first PTRS-DMRS association field included in the DCI (1106); determining a second DMRS port associated with a second PTRS port for PUSCH transmission to the first TRP based on the first PTRS-DMRS association field included in the DCI (1108); Including, Determining the at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the second TRP (1110-1112) includes: determining a third DMRS port associated with a third PTRS port for PUSCH transmission to the second TRP based on a most significant bit (MSB) of the second PTRS-DMRS association field included in the DCI (1110); determining a fourth DMRS port associated with a fourth PTRS port for PUSCH transmission to the second TRP based on the value of the second PTRS-DMRS association field included in the DCI (1112); Including, Transmitting the first PUSCH repetition to the first TRP (1114) includes transmitting the first PUSCH repetition to the first TRP on the first PTRS port associated with the first DMRS port and on the second PTRS port associated with the second DMRS port (1114); Transmitting the second PUSCH repetition to the second TRP (1116) includes transmitting the second PUSCH repetition to the second TRP on the third PTRS port associated with the third DMRS port and the fourth PTRS port associated with the fourth DMRS port (1116); the DCI comprises two PTRS-DMRS association fields, the first and second PTRS-DMRS association fields each having two bits; The MSB of the first PTRS-DMRS association field is the first DMRS port associated with the first PTRS port from a first DMRS port group; indicates, The least significant bit (LSB) of the first PTRS-DMRS association field is the second DMRS port associated with the second PTRS port from a second DMRS port group; indicates, The MSB of the second PTRS-DMRS association field is the third DMRS port associated with the third PTRS port from the first DMRS port group; indicates, The least significant bit of the second PTRS-DMRS association field is: the fourth DMRS port associated with the fourth PTRS port from the second DMRS port group; Showing, Wireless communication devices.

20. A wireless communication device as described in claim 19, further adapted to perform a method according to any one of claims 15 to 18.

21. 1. A wireless communication device, comprising: one or more transmitters; one or more receivers; a processing circuit associated with the one or more transmitters and the one or more receivers, the wireless communication device including: receiving (1104; 1204) downlink control information (DCI) from a base station, the DCI scheduling a physical uplink shared channel (PUSCH) repetition to two transmission / reception points (TRPs); The DCI is an antenna port field indicating two or more demodulation reference signal (DMRS) ports; a first phase tracking reference signal to demodulation reference signal (PTRS-DMRS) association field and a second PTRS-DMRS association field, each of which is a 2-bit field; Equipped with Let it receive, determining at least one DMRS port associated with at least one PTRS port for PUSCH transmission to a first TRP based on a value of at least one PTRS-DMRS association field included in the DCI (1106-1108; 1206-1208); determining at least one DMRS port associated with at least one PTRS port for PUSCH transmission to a second TRP based on a value of the at least one PTRS-DMRS association field included in the DCI (1110-1112; 1210-1212); transmitting a first PUSCH repetition for the first TRP on the at least one PTRS port for PUSCH transmission for the first TRP (1114; 1214); transmitting a second PUSCH repetition for the second TRP on the at least one PTRS port for PUSCH transmission for the first TRP (1116; 1216); a processing circuit configured to Equipped with The maximum rank is 4, and the first PTRS-DMRS association field is associated with a first sounding reference signal (SRS) that is a resource set associated with the first TRP, and the second PTRS-DMRS association field is associated with a second SRS resource set associated with the second TRP; or The first PTRS-DMRS association field is associated with a first transmit precoding matrix indicator (TPMI) field in the DCI associated with the first TRP, and the second PTRS-DMRS association field is associated with a second TPMI field in the DCI associated with the second TRP; or Two PT-RS ports are configured per TRP, 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 a first SRS resource indicator (SRI) field in the DCI associated with the first TRP, and the second SRS resource set is associated with a second SRI field in the DCI associated with the second TRP; The wireless communication device (612) is configured with two PTRS ports per TRP; Determining the at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the first TRP (1106-1108) includes: determining a first DMRS port associated with a first PTRS port for PUSCH transmission to the first TRP based on a value of the first PTRS-DMRS association field included in the DCI (1106); determining a second DMRS port associated with a second PTRS port for PUSCH transmission to the first TRP based on the first PTRS-DMRS association field included in the DCI (1108); Including, Determining the at least one DMRS port associated with the at least one PTRS port for PUSCH transmission to the second TRP (1110-1112) includes: determining a third DMRS port associated with a third PTRS port for PUSCH transmission to the second TRP based on a most significant bit (MSB) of the second PTRS-DMRS association field included in the DCI (1110); determining a fourth DMRS port associated with a fourth PTRS port for PUSCH transmission to the second TRP based on the value of the second PTRS-DMRS association field included in the DCI (1112); Including, Transmitting the first PUSCH repetition to the first TRP (1114) includes transmitting the first PUSCH repetition to the first TRP on the first PTRS port associated with the first DMRS port and on the second PTRS port associated with the second DMRS port (1114); Transmitting the second PUSCH repetition to the second TRP (1116) includes transmitting the second PUSCH repetition to the second TRP on the third PTRS port associated with the third DMRS port and the fourth PTRS port associated with the fourth DMRS port (1116); the DCI comprises two PTRS-DMRS association fields, the first and second PTRS-DMRS association fields each having two bits; The MSB of the first PTRS-DMRS association field is the first DMRS port associated with the first PTRS port from a first DMRS port group; indicates, The least significant bit (LSB) of the first PTRS-DMRS association field is the second DMRS port associated with the second PTRS port from a second DMRS port group; indicates, The MSB of the second PTRS-DMRS association field is the third DMRS port associated with the third PTRS port from the first DMRS port group; indicates, The least significant bit of the second PTRS-DMRS association field is: the fourth DMRS port associated with the fourth PTRS port from the second DMRS port group; Showing, Wireless communication devices.

22. A wireless communication device as described in claim 21, further adapted to perform a method as described in any one of claims 15 to 18.

23. 1. A method performed by a base station, comprising: Receiving downlink control information (DCI) at a wireless communication device (1104; 1204), the DCI scheduling a physical uplink shared channel (PUSCH) repetition to two transmission and reception points; The DCI is an antenna port field indicating two or more demodulation reference signal (DMRS) ports; a first phase tracking reference signal to demodulation reference signal (PTRS-DMRS) association field and a second PTRS-DMRS association field, each of which is a 2-bit field; Equipped with receiving the The maximum rank is 4, and the first PTRS-DMRS association field is associated with a first sounding reference signal (SRS) resource set associated with a first TRP, and the second PTRS-DMRS association field is associated with a second SRS resource set associated with a second TRP; or The first PTRS-DMRS association field is associated with a first transmit precoding matrix indicator (TPMI) field in the DCI associated with the first TRP, and the second PTRS-DMRS association field is associated with a second TPMI field in the DCI associated with the second TRP; or Two PT-RS ports are configured per TRP, 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 a first SRS resource indicator (SRI) field in the DCI associated with the first TRP, and the second SRS resource set is associated with a second SRI field in the DCI associated with the second TRP; the wireless communication device is configured with two PTRS ports per TRP; A first DMRS port associated with a first PTRS port for PUSCH transmission to the first TRP is determined based on a value of the first PTRS-DMRS association field included in the DCI; A second DMRS port associated with a second PTRS port for PUSCH transmission to the first TRP is determined based on the first PTRS-DMRS association field included in the DCI; A third DMRS port associated with a third PTRS port for PUSCH transmission to the second TRP is determined based on a most significant bit (MSB) of the second PTRS-DMRS association field included in the DCI; a fourth DMRS port associated with a fourth PTRS port for PUSCH transmission to the second TRP is determined based on the value of the second PTRS-DMRS association field included in the DCI; the DCI comprises two PTRS-DMRS association fields, the first and second PTRS-DMRS association fields each having two bits; the MSB of the first PTRS-DMRS association field indicates the first DMRS port associated with the first PTRS port from a first DMRS port group; a least significant bit (LSB) of the first PTRS-DMRS association field indicating the second DMRS port associated with the second PTRS port from a second DMRS port group; the MSB of the second PTRS-DMRS association field indicates the third DMRS port associated with the third PTRS port from the first DMRS port group; the LSB of the second PTRS-DMRS association field indicates the fourth DMRS port associated with the fourth PTRS port from the second DMRS port group; method.

24. A base station, Receiving downlink control information (DCI) at a wireless communication device (1104; 1204), the DCI scheduling a physical uplink shared channel (PUSCH) repetition to two transmission and reception points; The DCI is an antenna port field indicating two or more demodulation reference signal (DMRS) ports; a first phase tracking reference signal to demodulation reference signal (PTRS-DMRS) association field and a second PTRS-DMRS association field, each of which is a 2-bit field; Equipped with adapted to receive, The maximum rank is 4, and the first PTRS-DMRS association field is associated with a first sounding reference signal (SRS) resource set associated with a first TRP, and the second PTRS-DMRS association field is associated with a second SRS resource set associated with a second TRP; or The first PTRS-DMRS association field is associated with a first transmit precoding matrix indicator (TPMI) field in the DCI associated with the first TRP, and the second PTRS-DMRS association field is associated with a second TPMI field in the DCI associated with the second TRP; or Two PT-RS ports are configured per TRP, 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 a first SRS resource indicator (SRI) field in the DCI associated with the first TRP, and the second SRS resource set is associated with a second SRI field in the DCI associated with the second TRP; the wireless communication device is configured with two PTRS ports per TRP; A first DMRS port associated with a first PTRS port for PUSCH transmission to the first TRP is determined based on a value of the first PTRS-DMRS association field included in the DCI; A second DMRS port associated with a second PTRS port for PUSCH transmission to the first TRP is determined based on the first PTRS-DMRS association field included in the DCI; A third DMRS port associated with a third PTRS port for PUSCH transmission to the second TRP is determined based on a most significant bit (MSB) of the second PTRS-DMRS association field included in the DCI; a fourth DMRS port associated with a fourth PTRS port for PUSCH transmission to the second TRP is determined based on the value of the second PTRS-DMRS association field included in the DCI; the DCI comprises two PTRS-DMRS association fields, the first and second PTRS-DMRS association fields each having two bits; the MSB of the first PTRS-DMRS association field indicates the first DMRS port associated with the first PTRS port from a first DMRS port group; a least significant bit (LSB) of the first PTRS-DMRS association field indicating the second DMRS port associated with the second PTRS port from a second DMRS port group; the MSB of the second PTRS-DMRS association field indicates the third DMRS port associated with the third PTRS port from the first DMRS port group; the LSB of the second PTRS-DMRS association field indicates the fourth DMRS port associated with the fourth PTRS port from the second DMRS port group; Base station.

25. A base station, comprising: Having a wireless communication device receive (1104; 1204) downlink control information (DCI), the DCI scheduling a physical uplink shared channel (PUSCH) repetition to two transmission / reception points (TRPs); The DCI is an antenna port field indicating two or more demodulation reference signal (DMRS) ports; a first phase tracking reference signal to demodulation reference signal (PTRS-DMRS) association field and a second PTRS-DMRS association field, each of which is a 2-bit field; Equipped with a processing circuit configured to receive the The maximum rank is 4, and the first PTRS-DMRS association field is associated with a first sounding reference signal (SRS) resource set associated with a first TRP, and the second PTRS-DMRS association field is associated with a second SRS resource set associated with a second TRP; or the first PTRS-DMRS association field is associated with a first transmit precoding matrix indicator (TPMI) field in the DCI associated with the first TRP, and the second PTRS-DMRS association field is associated with a second TPMI field in the DCI associated with the second TRP; or Two PT-RS ports are configured per TRP, 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 a first SRS resource indicator (SRI) field in the DCI associated with the first TRP, and the second SRS resource set is associated with a second SRI field in the DCI associated with the second TRP; the wireless communication device is configured with two PTRS ports per TRP; A first DMRS port associated with a first PTRS port for PUSCH transmission to the first TRP is determined based on a value of the first PTRS-DMRS association field included in the DCI; A second DMRS port associated with a second PTRS port for PUSCH transmission to the first TRP is determined based on the first PTRS-DMRS association field included in the DCI; A third DMRS port associated with a third PTRS port for PUSCH transmission to the second TRP is determined based on a most significant bit (MSB) of the second PTRS-DMRS association field included in the DCI; a fourth DMRS port associated with a fourth PTRS port for PUSCH transmission to the second TRP is determined based on the value of the second PTRS-DMRS association field included in the DCI; the DCI comprises two PTRS-DMRS association fields, the first and second PTRS-DMRS association fields each having two bits; the MSB of the first PTRS-DMRS association field indicates the first DMRS port associated with the first PTRS port from a first DMRS port group; a least significant bit (LSB) of the first PTRS-DMRS association field indicating the second DMRS port associated with the second PTRS port from a second DMRS port group; the MSB of the second PTRS-DMRS association field indicates the third DMRS port associated with the third PTRS port from the first DMRS port group; the LSB of the second PTRS-DMRS association field indicates the fourth DMRS port associated with the fourth PTRS port from the second DMRS port group; Base station.

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