Signaling methods for sidelink positioning for heterogeneous user equipments
In some implementations, a target user equipment (UE) may receive, from an initiator UE via an SL interface, a discovery request corresponding to an SL positioning session, wherein the target UE comprises a plurality of transmission/reception points (TRPs). The target UE may determine, from the discovery request, the initiator UE is incapable of associating each TRP of the plurality of TRPs with the target UE. Responsive to determining the initiator UE is incapable of associating each TRP of the plurality of TRPs with the target UE, the target UE may participate in the SL positioning session with the target UE by either: (i) using only one TRP of the plurality of TRPs during the SL positioning session, or (ii) using each TRP of the plurality of TRPs such that each TRP operates as a distinct UE.
1 . A method of performing sidelink (SL) positioning, the method comprising:
receiving, at a target user equipment (UE), from an initiator UE, a discovery request corresponding to an SL positioning session, wherein the target UE comprises a plurality of transmission/reception points (TRPs);
determining, from the discovery request, the initiator UE is incapable of associating each TRP of the plurality of TRPs with the target UE; and
responsive to determining the initiator UE is incapable of associating each TRP of the plurality of TRPs with the target UE, participating in the SL positioning session with the target UE by either:
(i) using only one TRP of the plurality of TRPs during the SL positioning session, or
(ii) using each TRP of the plurality of TRPs such that each TRP operates as a distinct UE.
2 . The method of claim 1 , wherein determining the initiator UE is incapable of associating each TRP of the plurality of TRPs with the target UE is based on the discovery request comprising:
an indication that the initiator UE uses a release of a wireless standard incapable of multiple TRP (mTRP) positioning,
a flag indicating the initiator UE is incapable of mTRP positioning, or
any combination thereof.
3 . The method of claim 1 , wherein using only one TRP of the plurality of TRPs during the SL positioning session comprises using the one TRP to send:
pre-positioning reference signal (PRS) information,
a PRS,
post-PRS information, or
any combination thereof.
4 . The method of claim 3 , further comprising selecting, with the target UE, the one TRP from the plurality of TRPs based on:
a time at which the one TRP receives a PRS from the initiator UE,
a determination the one TRP has an unobstructed line of sight with the initiator UE,
a power consumption of the one TRP, or
any combination thereof.
5 . The method of claim 4 , wherein the determination the one TRP has an unobstructed line of sight with the initiator UE is based on sensor information from one or more sensors of the target UE.
6 . The method of claim 3 , further comprising including, in the post-PRS information, information indicative of a time of arrival at which PRS from the initiator UE was received at the target UE, wherein the time of arrival comprises:
an earliest time at which a PRS from the initiator UE arrived at any of the TRPs of the plurality TRPs,
an mean or average time at which a PRS from the initiator UE arrived at each TRP of the plurality TRPs, or
a time at which a PRS from the initiator UE arrived at the one TRP.
7 . The method of claim 1 , wherein using each TRP of the plurality of TRPs such that each TRP operates as a distinct UE comprises sending, from each TRP of the plurality of TRPs:
pre-positioning reference signal (PRS) information,
a PRS,
post-PRS information, or
any combination thereof.
8 . A target user equipment (UE) for performing sidelink (SL) positioning, the target UE comprising:
a transceiver;
a memory; and
one or more processors communicatively coupled with the transceiver and the memory, wherein the one or more processors are configured to:
receive, via the transceiver, from an initiator UE, a discovery request corresponding to an SL positioning session, wherein the target UE comprises a plurality of transmission/reception points (TRPs);
determine, from the discovery request, the initiator UE is incapable of associating each TRP of the plurality of TRPs with the target UE; and
responsive to determining the initiator UE is incapable of associating each TRP of the plurality of TRPs with the target UE, participate in the SL positioning session with the target UE by either:
(i) using only one TRP of the plurality of TRPs during the SL positioning session, or
(ii) using each TRP of the plurality of TRPs such that each TRP operates as a distinct UE.
9 . The target UE of claim 8 , wherein the one or more processors are configured to determine the initiator UE is incapable of associating each TRP of the plurality of TRPs with the target UE based on the discovery request comprising:
an indication that the initiator UE uses a release of a wireless standard incapable of multiple TRP (mTRP) positioning,
a flag indicating the initiator UE is incapable of mTRP positioning, or
any combination thereof.
10 . The target UE of claim 8 , wherein, to use only one TRP of the plurality of TRPs during the SL positioning session, the one or more processors are configured to use the one TRP to send:
pre-positioning reference signal (PRS) information,
a PRS,
post-PRS information, or
any combination thereof.
11 . The target UE of claim 10 , wherein the one or more processors are further configured to select the one TRP from the plurality of TRPs based on:
a time at which the one TRP receives a PRS from the initiator UE,
a determination the one TRP has an unobstructed line of sight with the initiator UE,
a power consumption of the one TRP, or
any combination thereof.
12 . The target UE of claim 11 , wherein the one or more processors are further configured to perform the determination the one TRP has an unobstructed line of sight with the initiator UE based on sensor information from one or more sensors.
13 . The target UE of claim 10 , wherein the one or more processors are further configured to include, in the post-PRS information, information indicative of a time of arrival at which PRS from the initiator UE was received at the target UE, wherein the time of arrival comprises:
an earliest time at which a PRS from the initiator UE arrived at any of the TRPs of the plurality TRPs,
an mean or average time at which a PRS from the initiator UE arrived at each TRP of the plurality TRPs, or
a time at which a PRS from the initiator UE arrived at the one TRP.
14 . The target UE of claim 8 , wherein, to use each TRP of the plurality of TRPs such that each TRP operates as a distinct UE, the one or more processors are configured to send, from each TRP of the plurality of TRPs:
pre-positioning reference signal (PRS) information,
a PRS,
post-PRS information, or
any combination thereof.