Resource allocation, reference signal design, and beam management for new radio (NR) positioning
A design for reference signals dedicated for positioning measurements in UL and DL directions and a mechanism for Tx/Rx beam pair selection for positioning is disclosed. The design can improve performance of positioning operation in NR communication systems, can improve resource efficiency of positioning operation in NR communication systems, and can reduce the amount of resources needed for PRS transmission, reduce latency and increase the positioning measurement quality.
1. A method for downlink (DL) transmitter (TX) beam sweeping and user equipment (UE) TX/Receiver (RX) beam selection, the method comprising:
configuring a UE with a plurality of Positioning Reference Signal (PRS) resources based on a plurality of PRS resource IDs to enable the UE to perform measurements of a plurality of signal location parameters (SLPs), the plurality of PRS resource IDs being associated with a plurality of geographically distributed antenna ports;
sweeping, by the configured UE, a plurality of antenna ports for each PRS Resource ID from among the plurality of PRS resource IDs;
estimating, by the configured UE in response to the sweeping, the plurality of SLPs for each antenna port from among the plurality of antenna ports for each PRS Resource ID from among the plurality of PRS resource IDs;
selecting, by the configured UE, a preferred antenna port from among the plurality of antenna ports for each PRS resource ID from among the plurality of PRS Resource IDs based upon the plurality of SLPs; and
reporting, by the UE, the preferred antenna port for each PRS resource ID from among the plurality of PRS resources IDs.
2. The method of claim 1 , further comprising:
receiving, by the UE prior to configuration, a transmission including the plurality of PRS resources from an access node (AN).
3. The method of claim 1 , wherein the plurality of PRS resources comprises one or more of:
a time allocation;
a frequency allocation;
a number of antenna ports;
a PRS resource index (ID);
a PRS Sequence ID;
a number of repeated PRS resource occasions; or
a beam sweeping indication.
4. The method of claim 1 , wherein at least one PRS resource from among the plurality of PRS resources is associated with a Synchronization Signal Block (SSB) index (ID) or a Channel-State Information (CSI) Reference Signal (RS) ID.
5. The method of claim 1 , wherein the estimating comprises:
measuring a plurality of reference signal received power (RSRP) measurements for the plurality of antenna ports for each PRS Resource ID from among the plurality of PRS resource IDs.
6. The method of claim 1 , further comprising:
applying, by the UE, the preferred antenna port for at least one PRS resource from among the plurality of PRS resources.
7. The method of claim 1 , wherein the plurality of SLPs comprises a plurality of phase differences, a plurality of times of arrival, a plurality of times of arrival timestamps, a plurality of time differences of arrival, a plurality of propagation times, a plurality of propagation delays, a plurality of angles of arrival, a plurality of angles of departure, or a plurality of received reference signal power.
8. A method for uplink (UL) transmitter (TX) beam sweeping and access node (AN) TX/Receiver (RX) beam selection, the method comprising:
configuring an AN with a plurality of Positioning Reference Signal (PRS) resources based on a plurality of PRS resource IDs to enable the AN to perform measurements of a plurality of signal location parameters (SLPs), the plurality of PRS resource IDs being associated with a plurality of geographically distributed antenna ports;
sweeping, by the configured AN, a plurality of antenna ports for each PRS Resource ID from among the plurality of PRS resource IDs;
estimating, by the configured AN in response to the sweeping, the plurality of SLPs for each antenna port from among the plurality of antenna ports for each PRS Resource ID from among the plurality of PRS resource IDs;
selecting, by the configured AN, a preferred antenna port from among the plurality of antenna ports for each PRS resource ID from among the plurality of PRS Resource IDs based upon the plurality of SLPs; and
reporting, by the configured AN, the preferred antenna port for each PRS resource ID from among the plurality of PRS resources IDs.
9. The method of claim 8 , further comprising:
receiving, by the AN prior to configuration, a transmission including the plurality of PRS resources from a user equipment (UE).
10. The method of claim 8 , wherein the plurality of PRS resources comprises one or more of:
a time allocation;
a frequency allocation;
a number of antenna ports;
a PRS resource index (ID);
a PRS Sequence ID;
a number of repeated PRS resource occasions; or
a beam sweeping indication.
11. The method of claim 8 , wherein at least one PRS resource from among the plurality of PRS resources is associated with a Synchronization Signal Block (SSB) index (ID) or a Channel-State Information (CSI) Reference Signal (RS) ID.
12. The method of claim 8 , wherein the estimating comprises:
measuring a plurality of reference signal received power (RSRP) measurements for the plurality of antenna ports for each PRS Resource ID from among the plurality of PRS resource IDs.
13. The method of claim 8 , further comprising:
applying, by the configured AN, the preferred antenna port for at least one PRS resource from among the plurality of PRS resources.
14. The method of claim 8 , wherein the plurality of SLPs comprises a plurality of phase differences, a plurality of times of arrival, a plurality of times of arrival timestamps, a plurality of time differences of arrival, a plurality of propagation times, a plurality of propagation delays, a plurality of angles of arrival, a plurality of angles of departure, or a plurality of received reference signal power.
15. An apparatus, comprising:
processor circuitry configured to:
configure the apparatus with a plurality of Positioning Reference Signal (PRS) resources based on a plurality of PRS resource IDs to enable the apparatus to perform measurements of a plurality of signal location parameters (SLPs), the plurality of PRS resource IDs being associated with a plurality of geographically distributed antenna ports, and
once configured:
sweep a plurality of antenna ports for each PRS Resource ID from among the plurality of PRS resource IDs,
estimate, in response to the sweeping, the plurality of SLPs for each antenna port from among the plurality of antenna ports for each PRS Resource ID from among the plurality of PRS resource IDs, and
select a preferred antenna port from among the plurality of antenna ports for each PRS resource ID from among the plurality of PRS Resource IDs based upon the plurality of SLPs; and
radio front end circuitry configured to report the preferred antenna port for each PRS resource ID from among the plurality of PRS resources IDs.
16. The apparatus of claim 15 , wherein the radio front end circuitry is further configured to receive a transmission including the plurality of PRS resources from an access node (AN).
17. The apparatus of claim 15 , wherein the plurality of PRS resources comprises one or more of:
a time allocation;
a frequency allocation;
a number of antenna ports;
a PRS resource index (ID);
a PRS Sequence ID;
a number of repeated PRS resource occasions; or
a beam sweeping indication.
18. The apparatus of claim 15 , wherein at least one PRS resource from among the plurality of PRS resources is associated with a Synchronization Signal Block (SSB) index (ID) or a Channel-State Information (CSI) Reference Signal (RS) ID.
19. The apparatus of claim 15 , wherein the processor circuitry is configured to measure a plurality of reference signal received power (RSRP) measurements for the plurality of antenna ports for each PRS Resource ID from among the plurality of PRS resource IDs.
20. The apparatus of claim 15 , wherein the plurality of SLPs comprises a plurality of phase differences, a plurality of times of arrival, a plurality of times of arrival timestamps, a plurality of time differences of arrival, a plurality of propagation times, a plurality of propagation delays, a plurality of angles of arrival, a plurality of angles of departure, or a plurality of received reference signal power.