Sidelink demodulation reference signal indication in sidelink control information
A wireless device may receive, from a base station, one or more radio resource control (RRC) messages. The one or more RRC messages may indicate a plurality of demodulation reference signal (DMRS) patterns and a length of a DMRS for each of the plurality of DMRS patterns. The wireless device may determine a DMRS pattern of a physical sidelink shared channel (PSSCH) based on the plurality of DMRS patterns and the length of the DMRS in the DMRS pattern. The wireless device may transmit, to a second wireless device, sidelink control information (SCI) indicating the DMRS pattern of the PSSCH and a number of one or more antenna ports for the DMRS in the DMRS pattern.
1. A wireless device comprising:
one or more processors; and
memory storing instructions that, when executed by the one or more processors, cause the wireless device to:
receive, from a base station, one or more radio resource control (RRC) messages indicating:
a plurality of demodulation reference signal (DMRS) patterns; and
a length of a DMRS for each of the plurality of DMRS patterns;
determine a DMRS pattern of a physical sidelink shared channel (PSSCH) based on the plurality of DMRS patterns and the length of the DMRS in the DMRS pattern; and
transmit, to a second wireless device, sidelink control information (SCI) indicating:
the DMRS pattern of the PSSCH; and
a number of one or more antenna ports for the DMRS in the DMRS pattern.
2. The wireless device of claim 1 , wherein the length of the DMRS, for each of the plurality of DMRS patterns, is a number of symbols within a slot.
3. The wireless device of claim 1 , wherein the SCI comprises:
a field indicating the DMRS pattern; and
a field indicating the number of the one or more antenna ports for the DMRS in the DMRS pattern.
4. The wireless device of claim 1 , wherein the plurality of DMRS patterns are a plurality of sidelink PSSCH DMRS patterns.
5. The wireless device of claim 1 , wherein:
the one or more RRC messages indicate a plurality of sidelink resource pools; and
the DMRS pattern is determined for a sidelink resource pool of the plurality of sidelink resource pools.
6. The wireless device of claim 1 , wherein the transmitting further comprises transmitting the DMRS on the PSSCH.
7. The wireless device of claim 1 , wherein the SCI is transmitted on the physical sidelink control channel (PSCCH).
8. A method comprising:
receiving, by a first wireless device from a base station, one or more radio resource control (RRC) messages indicating:
a plurality of demodulation reference signal (DMRS) patterns; and
a length of a DMRS for each of the plurality of DMRS patterns;
determining a DMRS pattern of a physical sidelink shared channel (PSSCH) based on the plurality of DMRS patterns and the length of the DMRS in the DMRS pattern; and
transmitting, to a second wireless device, sidelink control information (SCI) indicating:
the DMRS pattern of the PSSCH; and
a number of one or more antenna ports for the DMRS in the DMRS pattern.
9. The method of claim 8 , wherein the length of the DMRS, for each of the plurality of DMRS patterns, is a number of symbols within a slot.
10. The method of claim 8 , wherein the SCI comprises:
a field indicating the DMRS pattern; and
a field indicating the number of the one or more antenna ports for the DMRS in the DMRS pattern.
11. The method of claim 8 , wherein the plurality of DMRS patterns are a plurality of sidelink PSSCH DMRS patterns.
12. The method of claim 8 , wherein:
the one or more RRC messages indicate a plurality of sidelink resource pools; and
the DMRS pattern is determined for a sidelink resource pool of the plurality of sidelink resource pools.
13. The method of claim 8 , wherein the transmitting further comprises transmitting the DMRS on the PSSCH.
14. The method of claim 8 , wherein the SCI is transmitted on the physical sidelink control channel (PSCCH).
15. A non-transitory computer-readable medium comprising instructions that, when executed by one or more processors of a wireless device, cause the wireless device to:
receive, from a base station, one or more radio resource control (RRC) messages indicating:
a plurality of demodulation reference signal (DMRS) patterns; and
a length of a DMRS for each of the plurality of DMRS patterns;
determine a DMRS pattern of a physical sidelink shared channel (PSSCH) based on the plurality of DMRS patterns and the length of the DMRS in the DMRS pattern; and
transmit, to a second wireless device, sidelink control information (SCI) indicating:
the DMRS pattern of the PSSCH; and
a number of one or more antenna ports for the DMRS in the DMRS pattern.
16. The non-transitory computer-readable medium of claim 15 , wherein the length of the DMRS, for each of the plurality of DMRS patterns, is a number of symbols within a slot.
17. The non-transitory computer-readable medium of claim 15 , wherein the SCI comprises:
a field indicating the DMRS pattern; and
a field indicating the number of the one or more antenna ports for the DMRS in the DMRS pattern.
18. The non-transitory computer-readable medium of claim 15 , wherein the plurality of DMRS patterns are a plurality of sidelink PSSCH DMRS patterns.
19. The non-transitory computer-readable medium of claim 15 , wherein:
the one or more RRC messages indicate a plurality of sidelink resource pools; and
the DMRS pattern is determined for a sidelink resource pool of the plurality of sidelink resource pools.
20. The non-transitory computer-readable medium of claim 15 , wherein the transmitting further comprises transmitting the DMRS on the PSSCH.