Requesting a sidelink positioning reference signal resource

1 . A method performed by a user equipment (UE), the method comprising:

transmitting sidelink control information (SCI) that indicates a request for at least one resource for a sidelink positioning reference signal (SL-PRS), wherein the request is transmitted to a base station using a bit indicating the request is being made; and

transmitting the SL-PRS in the at least one resource based at least in part on the request, wherein the SL-PRS is transmitted in a same slot as the transmitted SCI.

2 . The method of claim 1 , wherein the resources are configured for at least one of a specific accuracy, a specific latency, to carry information about the specific accuracy, and to carry information about the specific latency.

3 . The method of claim 1 , wherein transmitting the request comprises transmitting the request using radio resource control (RRC) signaling or using a medium access control (MAC) control element (CE).

4 . The method of claim 1 , wherein a response contains a configured grant resource for the transmission of the SL-PRS or a dynamic grant resource for the transmission of the SL-PRS.

5 . The method of claim 4 , wherein the configured grant resource is activated based on an accuracy requirement, a latency requirement, or both, and the configured grant resource is activated using sidelink control information (SCI), a medium access control (MAC) control element (CE), or higher layer signaling.

6 . The method of claim 1 , further comprising receiving a sidelink grant, wherein the sidelink grant comprises at least one of a SL-PRS comb pattern, a time occasion, a SL-PRS offset, a destination identifier, a sidelink transmission configuration indicator, quasi-co-location (QCL) information, and a reporting configuration.

7 . The method of claim 1 , further comprising transmitting a report using a physical uplink control channel (PUCCH) transmission, uplink control information (UCI) over a physical uplink shared channel (PUSCH), a medium access control (MAC) control element (CE), radio resource control (RRC) signaling, a physical sidelink feedback channel (PSFCH) transmission, or SCI.

8 . The method of claim 7 , wherein the report comprises information indicating one or more of a source identifier, a destination identifier, and a group destination identifier.

9 . The method of claim 7 , wherein the report is transmitted using unicast or groupcast transmission.

10 . The method of claim 1 , further comprising transmitting SCI for a SL-PRS transmission together with the SL-PRS transmission.

11 . The method of claim 1 , wherein first SCI symbols and the transmission of SL-PRS are multiplexed in different time domain symbols.

12 . The method of claim 10 , wherein the SCI comprises one or more of:

one bit indicating presence of the SL-PRS transmission or sidelink data;

a priority of the SL-PRS transmission in the SCI is defined based on accuracy, latency, or a combination thereof; and

an indicator indicating a time and frequency resource for transmission of the SL-PRS, wherein the time and frequency resource comprises a resource for an initial SL-PRS transmission and a future reservation.

13 . The method of claim 12 , wherein the SCI further comprises one or more of:

a field SL-PRS comb pattern indication;

a SL-PRS offset;

quasi-co-location information;

a positioning technique indicating a time difference of arrival, an angle of departure, an angle of arrival, a multi-round trip time, or a combination thereof; and

a report transmission slot offset.

14 . The method of claim 12 , further comprising transmitting a plurality of presence indicators indicating the SL-PRS or a request for the transmission of the SL-PRS, wherein each presence indicator of the plurality of presence indicators or the request is associated with a positioning technique for a plurality of receiver UEs.

15 . The method of claim 10 , wherein the SCI comprises one or more of

a request bit indicating the request for the at least one resource for the SL-PRS from at least one receiver user equipment;

time-frequency resource reservation information;

a SL-PRS offset at each receiver user equipment based on an internal group member identifier;

a cast type of the SL-PRS; and

reception of the SL-PRS.

16 . The method of claim 15 , further comprising transmitting a plurality of presence indicators indicating the SL-PRS or a request for the transmission of the SL-PRS, wherein each presence indicator of the plurality of presence indicators or the request is associated with a positioning technique for a plurality of receiver UEs.

17 . A user equipment (UE), comprising:

at least one memory; and

at least one processor coupled with the at least one memory and configured to cause the UE to:

transmit sidelink control information (SCI) that indicates a request for at least one resource for a sidelink positioning reference signal (SL-PRS), wherein the request is transmitted to a base station using a bit indicating the request is being made; and

transmit the SL-PRS in the at least one resource based at least in part on the request, wherein the SL-PRS is transmitted in a same slot as the transmitted SCI.

18 . A processor for wireless communication, comprising:

at least one controller coupled with at least one memory and configured to cause the processor to:

transmit sidelink control information (SCI) that indicates a request for at least one resource for a sidelink positioning reference signal (SL-PRS), wherein the request is transmitted to a base station using a bit indicating the request is being made; and

transmit the SL-PRS in the at least one resource based at least in part on the request, wherein the SL-PRS is transmitted in a same slot as the transmitted SCI.