Using non-positioning signals for positioning in downlink and/or uplink
Systems and methods of a wireless communications system using signals not traditionally used for positioning purposes for positioning measurements in both uplink (UL) and downlink (DL) are described herein. A user equipment (UE) may generate a UE capability information message indicating one or more signal types that the UE can process for DL positioning measurements and/or that the UE can send for UL positioning measurements. The one or more signal types so indicated may include signals not traditionally used for positioning measurements. The UE may send, to the base station, the UE capability information message. The wireless communications system may then configure the base station and/or the UE to use such signal types with one or more positioning methods. In some embodiments, the base station may also indicate to the UE a subset of signals of an indicated type which should be processed for DL measurements/sent for UL measurements.
1. A method of a user equipment (UE), comprising:
generating a UE capability information message indicating one or more signal types that the UE can send for uplink (UL) positioning measurements;
sending, to a base station, the UE capability information message; and
sending, to the base station, one or more signals of the one or more signal types;
wherein the UE capability information message further indicates that signals of each of at least two signal types can be sent by the UE for UL positioning measurements in one of a same time resource, a same frequency resource, and a same time and frequency resource, the at least two signal types comprising at least one of the indicated one or more signal types.
2. The method of claim 1 , wherein the one or more signal types comprises sounding reference signal for multiple input multiple output (mimo-SRS).
3. The method of claim 2 , further comprising receiving, from the base station, an indication of a subset of mimo-SRS sent by the UE that can be used for UL positioning measurements.
4. The method of claim 1 , wherein the one or more signal types comprises a physical random access channel (PRACH).
5. The method of claim 1 , wherein the one or more signal types comprises physical uplink shared channel demodulation reference signal (PUSCH DMRS).
6. The method of claim 1 , wherein the UE is configured to send at least one of the one or more signals of the one or more signal types to the base station starting in any symbol of a slot used by the UE to send the at least one of the one or more signals.
7. The method of claim 1 , wherein the UE capability information message further indicates that a signal of one of the one or more signal types can be sent by the UE according to one or more of an inter-slot frequency hopping scheme, an intra-slot frequency hopping scheme, and a slot repetition scheme.
8. The method of claim 1 , wherein the UE capability information message further indicates a maximum supported number of signals of the at least two signal types that can be sent by the UE for UL positioning measurements within the one of the same time resource, the same frequency resource, and the same time and frequency resource.
9. The method of claim 1 , wherein the UE capability information message further indicates, to the base station, a maximum supported number of signals of a first of the at least two signal types that can be sent by the UE for UL positioning measurements within the one of the same time resource, the same frequency resource, and the same time and frequency resource.
10. The method of claim 9 , wherein the UE capability information further indicates a maximum supported number of signals of a second of the at least two signal types that can be sent by the UE for UL positioning measurements within the one of the same time resource, the same frequency resource, and the same time and frequency resource.
11. A method of a base station, comprising:
receiving, from a user equipment (UE), a UE capability information message indicating one or more signal types that the UE can send for uplink (UL) positioning measurements;
receiving, from the UE, one or more signals of the one or more signal types; and
performing a UL positioning measurement using the one or more signals;
wherein the UE capability information message further indicates that signals of each of at least two signal types can be sent by the UE for UL positioning measurements in one of a same time resource, a same frequency resource, and a same time and frequency resource, the at least two signal types comprising at least one of the indicated one or more signal types.
12. The method of claim 11 , wherein the UL positioning measurement is performed by the base station as part of one of an UL angle of arrival (UL-AoA) positioning method, a UL-time difference of arrival (UL-TDOA) positioning method, and a multi-round trip time (Multi-RTT) positioning method.
13. The method of claim 12 , wherein the one or more signal types comprises sounding reference signal for multiple input multiple output (mimo-SRS).
14. The method of claim 13 , further comprising sending, to the UE, an indication of a subset of mimo-SRS sent by the UE that can be used for UL positioning measurements.
15. The method of claim 11 , wherein the one or more signal types comprises a physical random access channel (PRACH) or a physical uplink shared channel demodulation reference signal (PUSCH DMRS).
16. The method of claim 11 , wherein the base station is configured to receive at least one of the one or more signals of the one or more signal types from the UE starting in any symbol of a slot used by the UE to send the at least one of the one or more signals.
17. The method of claim 11 , wherein the UE capability information message further indicates that a signal of one of the one or more signal types can be sent by the UE according to one or more of an inter-slot frequency hopping scheme, an intra-slot frequency hopping scheme, and a slot repetition scheme.
18. The method of claim 11 , wherein the UE capability information message further indicates a maximum supported number of signals of the at least two signal types that can be sent by the UE for UL positioning measurements within the one of the same time resource, the same frequency resource, and the same time and frequency resource.