Configuration and reporting in a non-terrestrial network
Various aspects of the present disclosure relate to a UE that receives, from a location server of a non-terrestrial network, first control signaling indicating a first PRS configuration that includes positioning assistance data and measurement reporting configuration. The UE also receives second control signaling indicating a second PRS configuration that indicates adapted PRS information based at least in part on mobility, an interference level, and/or a propagation delay pattern. The UE also receives third control signaling indicating a third PRS configuration that includes a duration for reporting a measurement of reference signals based at least in part on the adapted PRS information. The UE transmits, to the location server of the NTN, a report indicating the measurement of the reference signals and/or a location estimate based at least in part on the duration for the reporting.
1. A user equipment (UE) for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the UE to:
receive, from a location server of a non-terrestrial network (NTN), first control signaling indicating a first positioning reference signal (PRS) configuration comprising positioning assistance data and measurement reporting configuration, wherein the positioning assistance data comprises a PRS muting pattern that is based at least in part on a Doppler shift of PRSs;
receive second control signaling indicating a second PRS configuration based at least in part on the first control signaling, the second PRS configuration indicating adapted PRS information based at least in part on one or more of mobility, an interference level, or a propagation delay pattern;
receive third control signaling indicating a third PRS configuration based at least in part on the second control signaling, the third PRS configuration comprising a duration for reporting a measurement of the PRSs based at least in part on the adapted PRS information; and
transmit, to the location server of the NTN, a report indicating at least one of a timing drift associated with the Doppler shift of the PRSs, the measurement of the PRSs, or a location estimate based at least in part on the duration for the reporting.
2. The UE of claim 1 , wherein the positioning assistance data comprises PRS configurations associated with one or more of time and frequency resources for transmission, muting pattern configurations, a transmission power, repetition transmission, a periodicity and slot offset, a number of symbols to be transmitted, or a comb size and resource element offset.
3. The UE of claim 1 , wherein the measurement reporting configuration comprises a request for one or more radio access technology-independent positioning techniques or radio access technology-dependent positioning techniques, comprising one or more of downlink-time difference of arrival, multi-round trip time, or downlink-angle of departure.
4. The UE of claim 1 , wherein the positioning assistance data and the measurement reporting configuration is combined in an NTN configuration message received from the location server as a dedicated unicast configuration or a broadcast message to one or more UEs.
5. The UE of claim 1 , wherein the positioning assistance data is preconfigured for an available PRS configuration at the UE, and wherein the positioning assistance data is one or more of activated, modified, deactivated, or associated with a set of validity conditions.
6. The UE of claim 1 , wherein the at least one processor is further configured to cause the UE to receive a PRS configuration message that comprises multiple sets of PRS periodicities as functions of location information and ephemeris data associated with at least one non-terrestrial station in an NTN system.
7. The UE of claim 1 , wherein the PRS muting pattern is a function of a geographical zone defined by three-dimensional ephemeris data associated with at least one non-terrestrial station, or defined by a two-dimensional projection of the three-dimensional ephemeris data on earth.
8. The UE of claim 1 , wherein the PRS muting pattern is a function of one or more of a quantity of base stations implemented in respective non-terrestrial stations, a quantity of transmission beams emitted from the respective non-terrestrial stations, or the Doppler shift of the PRSs.
9. The UE of claim 1 , wherein the positioning assistance data comprises an NTN positioning measurement window configured by the location server with one or more of a start time, a time duration, a periodicity, or a repetition factor.
10. The UE of claim 1 , wherein the positioning assistance data comprises a response time as a function of propagation time delays associated with the UE, at least one non-terrestrial station, and a gateway.
11. The UE of claim 1 , wherein the third PRS configuration comprises a conditional response time configured by the location server based on a set of defined conditions associated with the NTN.
12. The UE of claim 1 , wherein the third PRS configuration comprises multiple response times configured by the location server based on a validity of the positioning assistance data.
13. The UE of claim 1 , wherein the measurement reporting configuration is based on one or more of NTN-specific reporting criteria, NTN-specific reporting periodicities, or NTN-related environmental variables.
14. A network equipment (NE) for wireless communication, comprising:
at least one memory; and
at least one processor coupled with the at least one memory and configured to cause the NE to:
transmit, to a user equipment (UE) in a non-terrestrial network (NTN), first control signaling indicating a first positioning reference signal (PRS) configuration comprising positioning assistance data and measurement reporting configuration, wherein the positioning assistance data comprises a PRS muting pattern that is based at least in part on a Doppler shift of PRSs;
transmit second control signaling indicating a second PRS configuration based at least in part on the first control signaling, the second PRS configuration indicating adapted PRS information based at least in part on one or more of mobility, an interference level, or a propagation delay pattern;
transmit third control signaling indicating a third PRS configuration based at least in part on the second control signaling, the third PRS configuration comprising a duration for reporting a measurement of the PRSs based at least in part on the adapted PRS information; and
receive, from the UE, a report indicating at least one of a timing drift associated with the Doppler shift of the PRSs, the measurement of the PRSs, or a location estimate based at least in part on the duration for the reporting.
15. The NE of claim 14 , wherein the measurement reporting configuration comprises a request for one or more radio access technology-independent positioning techniques or radio access technology-dependent positioning techniques, comprising one or more of downlink-time difference of arrival, multi-round trip time, or downlink-angle of departure.
16. The NE of claim 14 , wherein the positioning assistance data and the measurement reporting configuration are unicast or broadcast in a combined NTN configuration message to one or more UEs.
17. A method performed by a user equipment (UE), the method comprising:
receiving, from a location server of a non-terrestrial network (NTN), first control signaling indicating a first positioning reference signal (PRS) configuration comprising positioning assistance data and measurement reporting configuration, wherein the positioning assistance data comprises a PRS muting pattern that is based at least in part on a Doppler shift of PRSs;
receiving second control signaling indicating a second PRS configuration based at least in part on the first control signaling, the second PRS configuration indicating adapted PRS information based at least in part on one or more of mobility, an interference level, or a propagation delay pattern;
receiving third control signaling indicating a third PRS configuration based at least in part on the second control signaling, the third PRS configuration comprising a duration for reporting a measurement of the PRSs based at least in part on the adapted PRS information; and
transmitting, to the location server of the NTN, a report indicating at least one of a timing drift associated with the Doppler shift of the PRSs, the measurement of the PRSs, or a location estimate based at least in part on the duration for the reporting.
18. The method of claim 17 , wherein the measurement reporting configuration comprises measurement quality metrics and a request for one or more radio access technology-independent positioning techniques or radio access technology-dependent positioning techniques, comprising one or more of downlink-time difference of arrival, multi-round trip time, or downlink-angle of departure.
19. The method of claim 17 , wherein the positioning assistance data is preconfigured for available PRS configuration at the UE, and wherein the positioning assistance data is one or more of activated, modified, deactivated, or associated with a set of validity conditions.
20. A processor for wireless communication, comprising:
at least one controller coupled with at least one memory and configured to cause the processor to:
receive, from a location server of a non-terrestrial network (NTN), first control signaling indicating a first positioning reference signal (PRS) configuration comprising positioning assistance data and measurement reporting configuration, wherein the positioning assistance data comprises a PRS muting pattern that is based at least in part on a Doppler shift of PRSs;
receive second control signaling indicating a second PRS configuration based at least in part on the first control signaling, the second PRS configuration indicating adapted PRS information based at least in part on one or more of mobility, an interference level, or a propagation delay pattern;
receive third control signaling indicating a third PRS configuration based at least in part on the second control signaling, the third PRS configuration comprising a duration for reporting a measurement of the PRSs based at least in part on the adapted PRS information; and
transmit, to the location server of the NTN, a report indicating at least one of a timing drift associated with the Doppler shift of the PRSs, the measurement of the PRSs, or a location estimate based at least in part on the duration for the reporting.