Determining a position of a target UE using assisting UE signaling
Systems and methods for measuring at and reporting by a target user equipment (UE) of one or more positioning signals sent from one or more assisting UEs to the target UE are disclosed herein. The target UE may receive a positioning signal from an assisting UE according to a communication received at the target UE. The target UE may proceed to perform a positioning measurement using the positioning signal received from the target UE. The positioning measurement may be used by the target UE to estimate its own position, or the positioning measurement may be sent to another entity within a wireless communications system to be used in estimating the physical position of the UE. The handling of multiple received positioning signals from various sources, and the handling of situations where, for example, a transmission reception point (TRP) and an assisting UE may schedule overlapping positioning signals, ate also discussed.
1. A method of a target user equipment (UE) of a wireless communications system, comprising:
receiving a communication indicating that the target UE is to receive a positioning signal from an assisting UE;
receiving, from the assisting UE, the positioning signal, wherein the positioning signal is a semi-persistent downlink (DL) positioning reference signal (DL-PRS) which is configured according to one of a radio resource control (RRC) configuration received at the target UE from a base station and a preconfiguration of the target UE, wherein the receiving of the semi-persistent DL-PRS is activated by one of downlink control information (DCI) from the base station and sidelink control information (SCI) from the assisting UE; and
performing a positioning measurement using the positioning signal received from the assisting UE.
2. The method of claim 1 , further comprising transmitting a UE capability information message indicating that the target UE is capable of measuring a positioning signal received from the assisting UE.
3. The method of claim 1 , wherein the communication further indicates that the target UE is to receive the positioning signal from the assisting UE on one or more symbols specified for use in a direction that is one of an uplink (UL) direction, a downlink (DL) direction, or a flexible direction.
4. The method of claim 3 , wherein the positioning signal is of a type that corresponds to the direction for which the one or more symbols is specified.
5. The method of claim 1 , further comprising determining that the positioning signal is one of a reporting subset of a plurality of positioning signals received from a plurality of UEs that includes the assisting UE.
6. The method of claim 5 , wherein the positioning signal is determined to be one of the reporting subset based on a reference signal received power (RSRP) of the positioning signal.
7. The method of claim 5 , wherein the positioning signal is determined to be one of the reporting subset based on source prioritization information.
8. A method of a target user equipment (UE) of a wireless communications system, comprising:
receiving a communication indicating that the target UE is to receive a positioning signal from an assisting UE, wherein the positioning signal is one of:
a periodic sounding reference signal (SRS) which is configured according to one of a first radio resource control (RRC) configuration received at the target UE from a base station and a first preconfiguration of the target UE, and
a semi-persistent SRS which is configured according to one of a second RRC configuration received at the target UE from the base station and a second preconfiguration of the target UE, wherein the receiving of the periodic SRS is activated by one of downlink control information (DCI) from the base station and sidelink control information (SCI) from the assisting UE;
receiving, from the assisting UE, the positioning signal; and
performing a positioning measurement using the positioning signal received from the assisting UE.
9. The method of claim 8 , further comprising transmitting a UE capability information message indicating that the target UE is capable of measuring a positioning signal received from the assisting UE.
10. The method of claim 8 , wherein the communication further indicates that the target UE is to receive the positioning signal from the assisting UE on one or more symbols specified for use in a direction that is one of an uplink (UL) direction, a downlink (DL) direction, or a flexible direction.
11. The method of claim 10 , wherein the positioning signal is of a type that corresponds to the direction for which the one or more symbols is specified.
12. The method of claim 8 , further comprising determining that the positioning signal is one of a reporting subset of a plurality of positioning signals received from a plurality of UEs that includes the assisting UE.
13. The method of claim 12 , wherein the positioning signal is determined to be one of the reporting subset based on a reference signal received power (RSRP) of the positioning signal.
14. The method of claim 12 , wherein the positioning signal is determined to be one of the reporting subset based on source prioritization information.
15. A method of a target user equipment (UE) of a wireless communications system, comprising:
receiving a communication indicating that the target UE is to receive a positioning signal from an assisting UE;
receiving, from the assisting UE, the positioning signal;
performing a positioning measurement using the positioning signal received from the assisting UE;
receiving a second positioning signal from an entity of the wireless communications system other than the assisting UE on a component carrier that differs from the component carrier on which the positioning signal is received, wherein the positioning signal and the second positioning signal overlap on one or more symbols; and
performing a second positioning measurement using the second positioning signal.
16. The method of claim 15 , further comprising transmitting a UE capability information message indicating that the target UE is capable of measuring a positioning signal received from the assisting UE.
17. The method of claim 15 , wherein the communication is received from the assisting UE in sidelink control information (SCI).
18. The method of claim 15 , wherein the communication is received in one of downlink control information (DCI) or a medium access control (MAC) control element (MAC-CE) from a base station.
19. The method of claim 15 , wherein the communication further indicates that the target UE is to receive the positioning signal from the assisting UE on one or more symbols specified for use in a direction that is one of an uplink (UL) direction, a downlink (DL) direction, or a flexible direction.
20. The method of claim 19 , wherein the positioning signal is of a type that corresponds to the direction for which the one or more symbols is specified.