Client device and serving device for associating PTRS antenna ports to DMRS antenna ports

1. A client device for a wireless communication system, comprising:

a processor; and

a non-transitory computer readable medium storing a program for execution by the processor, the program including instructions to:

obtain configuration information related to a set of phase tracking reference signal (PTRS) antenna ports;

obtain control information indicating at least one of one or more codewords, a set of demodulation reference signal (DMRS) antenna ports assigned to the one or more codewords, or transmission configuration indication (TCI) information indicating one or more TCI states; and

determine an association between the set of PTRS antenna ports and the set of DMRS antenna ports based on the configuration information related to the set of PTRS antenna ports and the control information, wherein the association between the set of PTRS antenna ports and the set of DMRS antenna ports indicates that a DMRS antenna port of the set of DMRS antenna ports associated with a PTRS antenna port is used for transmission of a PTRS, wherein in response to only one PTRS port and one codeword being scheduled, the PTRS antenna port is associated with a lowest indexed DMRS antenna port of the set of DMRS antenna ports, wherein in response to only one PTRS port and two codewords being scheduled, and further in response to modulation and coding scheme (MCS) indices of the two codewords being different, the PTRS antenna port is associated with the lowest indexed DMRS antenna port among the set of DMRS antenna ports assigned for the codeword with a higher MCS index, and wherein in response to only one PTRS port and two codewords being scheduled, and further in response to the MCS indices of the two codewords being same, the PTRS antenna port is associated with the lowest indexed DMRS antenna port assigned for codeword 0.

2. The client device according to claim 1 , wherein the control information indicates the set of demodulation reference signal (DMRS) antenna ports, wherein the set of DMRS antenna ports is assigned for one codeword and is split into a first subset of DMRS antenna ports and a second subset of DMRS antenna ports, wherein a first PTRS antenna port of the set of PTRS antenna ports is associated with a DMRS antenna port having a specific index in the first subset of DMRS antenna ports, and wherein a second PTRS antenna port of the set of PTRS antenna ports is associated with a DMRS antenna port having a specific index in the second subset of DMRS antenna ports.

3. The client device according to claim 2 , wherein the TCI information indicates one TCI state, wherein the first subset of DMRS antenna ports belongs to a first code division multiplexing (CDM) group, and wherein the second subset of DMRS antenna ports belongs to one or more CDM groups other than the first CDM group.

4. The client device according to claim 2 , wherein the TCI information indicates two TCI states, wherein the first subset of DMRS antenna ports belongs to a first CDM group, and wherein the second subset of DMRS antenna ports belongs to one or more CDM groups other than the first CDM group.

5. The client device according to claim 2 , wherein the TCI information indicates one TCI state, and wherein the first subset of DMRS antenna ports and the second subset of DMRS antenna ports are given by a radio resource control (RRC) configuration.

6. The client device according to claim 2 , wherein the TCI information indicates two TCI states, and wherein the first subset of DMRS antenna ports and the second subset of DMRS antenna ports are given by a radio resource control (RRC) configuration.

7. The client device according to claim 6 , wherein the configuration information related to a set of PTRS antenna ports comprises the RRC configuration.

8. The client device according to claim 2 , wherein the TCI information indicates a first TCI state and a second TCI state, wherein the first subset of DMRS antenna ports is associated with the first TCI state, and wherein the second subset of DMRS antenna ports is associated with the second TCI state.

9. The client device according to claim 1 , wherein the set of DMRS antenna ports is assigned a first codeword and a second codeword, wherein a first PTRS antenna port of the set of PTRS antenna ports is associated with a DMRS antenna port of the set of DMRS antenna ports having a specific index assigned to the first codeword, and wherein a second PTRS antenna port of the set of PTRS antenna ports is associated with a DMRS antenna port of the set of DMRS antenna ports having a specific index assigned to the second codeword.

10. The client device according to claim 1 , wherein the program further includes instructions to:

obtain, from higher layer signaling, the configuration information related to the set of PTRS antenna ports; and

obtain the control information in a physical downlink control channel (PDCCH) associated with a physical downlink shared channel (PDSCH).

11. The client device according to claim 10 , wherein the set of PTRS antenna ports and the set of DMRS antenna ports are scheduled for the PDSCH.

12. A serving device for a wireless communication system, comprising:

a processor; and

a non-transitory computer readable medium storing a program for execution by the processor, the program including instructions to:

provide configuration information related to a set of phase tracking reference signal (PTRS) antenna ports; and

provide control information indicating at least one of one or more codewords, a set of demodulation reference signal (DMRS) antenna ports assigned to the one or more codewords, or transmission configuration indication (TCI) information indicating one or more TCI states,

wherein an association between the set of PTRS antenna ports and the set of DMRS antenna ports is determined based on the configuration information related to a set of PTRS antenna ports and the control information, and wherein the association between the set of PTRS antenna ports and the set of DMRS antenna ports indicates that a DMRS antenna port of the set of DMRS antenna ports associated with a PTRS antenna port is used for transmission of a PTRS, wherein in response to only one PTRS port and one codeword being scheduled, the PTRS antenna port is associated with a lowest indexed DMRS antenna port of the set of DMRS antenna ports, wherein in response to only one PTRS port and two codewords being scheduled, and further in response to modulation and coding scheme (MCS) indices of the two codewords being different, the PTRS antenna port is associated with the lowest indexed DMRS antenna port among the set of DMRS antenna ports assigned for the codeword with a higher MCS index, and wherein in response to only one PTRS port and two codewords being scheduled, and further in response to the MCS indices of the two codewords being same, the PTRS antenna port is associated with the lowest indexed DMRS antenna port assigned for codeword 0.

13. The serving device according to claim 12 , wherein the set of DMRS antenna ports is assigned for one codeword and is split into a first subset of DMRS antenna ports and a second subset of DMRS antenna ports, wherein a first PTRS antenna port of the set of PTRS antenna ports is associated with a DMRS antenna port having a specific index in the first subset of DMRS antenna ports, and wherein a second PTRS antenna port of the set of PTRS antenna ports is associated with a DMRS antenna port having a specific index in the second subset of DMRS antenna ports.

14. The serving device according to claim 13 , wherein the TCI information indicates one TCI state, wherein the first subset of DMRS antenna ports belongs to a first CDM group, and wherein the second subset of DMRS antenna ports belongs to one or more CDM groups other than the first CDM group.

15. The serving device according to claim 13 , wherein the TCI information indicates two TCI states, wherein the first subset of DMRS antenna ports belongs to a first CDM group, and wherein the second subset of DMRS antenna ports belongs to one or more CDM groups other than the first CDM group.

16. The serving device according to claim 13 , wherein the TCI information indicates one TCI state; and

wherein the program further includes instructions to provide a radio resource control (RRC) configuration indicating the first subset of DMRS antenna ports and the second subset of DMRS antenna ports.

17. The serving device according to claim 13 , wherein the TCI information indicates two TCI states; and

wherein the program further includes instructions to provide a radio resource control (RRC) configuration indicating the first subset of DMRS antenna ports and the second subset of DMRS antenna ports.

18. The serving device according to claim 17 , wherein the program further includes instructions to provide the RRC configuration in the configuration information related to a set of PTRS antenna ports.

19. The serving device according to claim 13 , wherein the TCI information indicates a first TCI state and a second TCI state, wherein the first subset of DMRS antenna ports is associated with the first TCI state, and wherein the second subset of DMRS antenna ports is associated with the second TCI state.

20. The serving device according to claim 12 , wherein the set of DMRS antenna ports is assigned a first codeword and a second codeword, wherein a first PTRS antenna port of the set of PTRS antenna ports is associated with a DMRS antenna port of the set of DMRS antenna ports having a specific index assigned to the first codeword, and wherein a second PTRS antenna port of the set of PTRS antenna ports is associated with a DMRS antenna port of the set of DMRS antenna ports having a specific index assigned to the second codeword.

21. The serving device according to claim 12 , wherein the program further includes instructions to:

provide the configuration information related to the set of PTRS antenna ports through higher layer signalling; and

provide the control information in a physical downlink control channel (PDCCH) associated with a physical downlink shared channel (PDSCH).

22. The serving device according to claim 21 , wherein the set of PTRS antenna ports and the set of DMRS antenna ports are scheduled for the PDSCH.

23. A method, comprising:

obtaining configuration information related to a set of phase tracking reference signal (PTRS) antenna ports;

obtaining control information indicating at least one of one or more codewords, a set of demodulation reference signal (DMRS) antenna ports assigned to the one or more codewords, or transmission configuration indication (TCI) information indicating one or more TCI states; and

determining an association between the set of PTRS antenna ports and the set of DMRS antenna ports based on the configuration information related to the set of PTRS antenna ports and the control information, wherein the association between the set of PTRS antenna ports and the set of DMRS antenna ports indicates that a DMRS antenna port of the set of DMRS antenna ports associated with a PTRS antenna port is used for transmission of a PTRS, wherein in response to only one PTRS port and one codeword being scheduled, the PTRS antenna port is associated with a lowest indexed DMRS antenna port of the set of DMRS antenna ports, wherein in response to only one PTRS port and two codewords being scheduled, and further in response to modulation and coding scheme (MCS) indices of the two codewords being different, the PTRS antenna port is associated with the lowest indexed DMRS antenna port among the set of DMRS antenna ports assigned for the codeword with a higher MCS index, and wherein in response to only one PTRS port and two codewords being scheduled, and further in response to the MCS indices of the two codewords being same, the PTRS antenna port is associated with the lowest indexed DMRS antenna port assigned for codeword 0.

24. A method, comprising:

providing configuration information related to a set of phase tracking reference signal (PTRS) antenna ports; and

providing control information indicating at least one of one or more codewords, a set of demodulation reference signal (DMRS) antenna ports assigned to the one or more codewords, or transmission configuration indication (TCI) information indicating one or more TCI states,

wherein an association between the set of PTRS antenna ports and the set of DMRS antenna ports is determined based on the configuration information related to a set of PTRS antenna ports and the control information, and wherein the association between the set of PTRS antenna ports and the set of DMRS antenna ports indicates that a DMRS antenna port of the set of DMRS antenna ports associated with a PTRS antenna port is used for transmission of a PTRS, wherein in response to only one PTRS port and one codeword being scheduled, the PTRS antenna port is associated with a lowest indexed DMRS antenna port of the set of DMRS antenna ports, wherein in response to only one PTRS port and two codewords being scheduled, and further in response to modulation and coding scheme (MCS) indices of the two codewords being different, the PTRS antenna port is associated with the lowest indexed DMRS antenna port among the set of DMRS antenna ports assigned for the codeword with a higher MCS index, and wherein in response to only one PTRS port and two codewords being scheduled, and further in response to the MCS indices of the two codewords being same, the PTRS antenna port is associated with the lowest indexed DMRS antenna port assigned for codeword 0.

25. A non-transitory computer readable medium storing program code for execution by a computer, the program code comprising instructions for:

obtaining configuration information related to a set of phase tracking reference signal (PTRS) antenna ports;

obtaining control information indicating at least one of one or more codewords, a set of demodulation reference signal (DMRS) antenna ports assigned to the one or more codewords, and transmission configuration indication (TCI) information indicating one or more TCI states; and

determining an association between the set of PTRS antenna ports and the set of DMRS antenna ports based on the configuration information related to the set of PTRS antenna ports and the control information, wherein the association between the set of PTRS antenna ports and the set of DMRS antenna ports indicates that a DMRS antenna port of the set of DMRS antenna ports associated with a PTRS antenna port is used for transmission of a PTRS, wherein in response to only one PTRS port and one codeword being scheduled, the PTRS antenna port is associated with a lowest indexed DMRS antenna port of the set of DMRS antenna ports, wherein in response to only one PTRS port and two codewords being scheduled, and further in response to modulation and coding scheme (MCS) indices of the two codewords being different, the PTRS antenna port is associated with the lowest indexed DMRS antenna port among the set of DMRS antenna ports assigned for the codeword with a higher MCS index, and wherein in response to only one PTRS port and two codewords being scheduled, and further in response to the MCS indices of the two codewords being same, the PTRS antenna port is associated with the lowest indexed DMRS antenna port assigned for codeword 0.