Minimum positioning reference signal (PRS) processing when measurement gaps are not configured
Disclosed are techniques for wireless communication. In an aspect, a user equipment (UE) transmits, to a network entity, one or more capability messages indicating one or more capabilities of the UE to process positioning reference signals (PRS), the one or more capabilities indicating at least a duration of PRS that the UE can process within a measurement window without a measurement gap, and performs one or more positioning measurements of one or more PRS resources during the measurement window up to the duration of PRS.
1. A method of wireless communication performed by a user equipment (UE), comprising:
transmitting, to a network entity, one or more capability messages indicating one or more capabilities of the UE to process positioning reference signals (PRS), wherein the one or more capabilities indicate at least a duration of PRS that the UE can process within a measurement window without a measurement gap, wherein the one or more capabilities indicate a minimum gap between a last repetition of a last PRS resource of a PRS instance and an end of the measurement window, and wherein the UE is not expected to process PRS resources that are closer than the minimum gap to the end of the measurement window; and
performing one or more positioning measurements of one or more PRS resources during the measurement window up to the duration of PRS.
2. The method of claim 1 , wherein:
the duration of PRS is related to a PRS instance length, and
the measurement window is related to a PRS periodicity.
3. The method of claim 2 , wherein a ratio of the PRS instance length to the PRS periodicity is equal to a ratio of a measurement gap length to a measurement gap repetition periodicity that the UE can support when measurement gaps are configured.
4. The method of claim 2 , wherein the one or more capabilities further indicate the PRS instance length and the PRS periodicity that the UE can process with a measurement gap.
5. The method of claim 2 , wherein a ratio of the PRS instance length to the PRS periodicity is a factor of a ratio of a measurement gap length to a measurement gap repetition periodicity.
6. The method of claim 1 , wherein the last repetition of the last PRS resource of the PRS instance and a first repetition of a first PRS resource of a subsequent PRS instance are on the same frequency layer.
7. The method of claim 1 , wherein the last repetition of the last PRS resource of the PRS instance and a first repetition of a first PRS resource of a subsequent PRS instance are on different frequency layers.
8. The method of claim 1 , wherein the minimum gap depends on a subcarrier spacing or slot duration of the last repetition of the last PRS resource of the PRS instance and the first repetition of the first PRS resource of the subsequent PRS instance.
9. The method of claim 1 , wherein the minimum gap equals a ratio of a measurement gap length to a measurement gap repetition periodicity.
10. The method of claim 1 , wherein:
the duration of PRS is indicated as a number of PRS resources, and
the measurement window is a slot.
11. The method of claim 10 , wherein a minimum of the number of PRS resources within the slot is based on a subcarrier spacing of the slot.
12. The method of claim 11 , wherein the minimum of the number of PRS resources within the slot comprises:
16 PRS resources for 15 kilohertz (kHz) subcarrier spacing,
8 PRS resources for 30 kHz subcarrier spacing,
4 PRS resources for 60 kHz subcarrier spacing, and
2 PRS resources for 120 kHz subcarrier spacing.
13. The method of claim 11 , wherein the minimum of the number of PRS resources within the slot comprises:
16 PRS resources for frequency range 1 (FR1), and
2 PRS resources for frequency range 2 (FR2).
14. The method of claim 10 , wherein a minimum of the number of PRS resources within the slot is smaller than the number of PRS resources within the slot that the UE can support when measurement gaps are configured.
15. The method of claim 1 , wherein:
the duration of PRS is indicated as a number of PRS symbols ‘N,’ and
the measurement window is indicated as a number of milliseconds ‘T’.
16. The method of claim 15 , wherein a minimum of the number of PRS symbols ‘N’ is equal to a smallest measurement gap length the UE can support.
17. The method of claim 15 , wherein a minimum of the number of PRS symbols ‘N’ is equal to a largest measurement gap length the UE can support.
18. The method of claim 17 , wherein the minimum of the number of PRS symbols ‘N’ is based on whether the PRS are in FR1 or FR2.
19. The method of claim 15 , wherein the number of milliseconds ‘T’ is equal to a smallest measurement gap repetition periodicity larger than a second number of milliseconds ‘T’ the UE supports when measurement gaps are supported.
20. The method of claim 15 , wherein the number of milliseconds ‘T’ is equal to a first measurement gap repetition periodicity for FR1 or a second measurement gap repetition periodicity for FR2.
21. The method of claim 15 , wherein the number of milliseconds ‘T’ is equal to a largest measurement gap repetition periodicity that the UE supports for FR1 or FR2.
22. The method of claim 15 , wherein the number of milliseconds ‘T’ is equal to a largest measurement gap repetition periodicity that the UE supports.
23. The method of claim 15 , wherein:
the number of PRS symbols ‘N’ is equal to a measurement gap length, and
the number of milliseconds ‘T’ is equal to a measurement gap repetition periodicity.
24. The method of claim 23 , wherein the measurement gap length and the measurement gap repetition periodicity are based on whether the PRS are in FR1 or FR2.
25. The method of claim 15 , wherein:
values of ‘N’ are selected from a set of {0.125, 0.25, 0.5, 1, 2, 4, 8, 12, 16, 20, 25, 30, 35, 40, 45, 50} ms, and
values of ‘T’ are selected from a set of {8, 16, 20, 30, 40, 80, 160, 320, 640, 1280} ms.
26. The method of claim 1 , wherein a maximum bandwidth supported by the UE when measurement gaps are not configured is the same as when measurement gaps are configured.
27. The method of claim 1 , wherein:
the network entity is a location server, and
the one or more capability messages comprise one or more Long-Term Evolution (LTE) positioning protocol (LPP) messages.
28. The method of claim 1 , wherein:
the network entity is a serving base station, and
the one or more capability messages comprise one or more radio resource control (RRC) messages, one or more medium access control control elements (MAC-CEs), or uplink control information.
29. A user equipment (UE), comprising:
one or more memories;
one or more transceivers; and
one or more processors communicatively coupled to the one or more memories and the one or more transceivers, the one or more processors, either alone or in combination, configured to:
transmit, via the one or more transceivers, to a network entity, one or more capability messages indicating one or more capabilities of the UE to process positioning reference signals (PRS), wherein the one or more capabilities indicate at least a duration of PRS that the UE can process within a measurement window without a measurement gap, wherein the one or more capabilities indicate a minimum gap between a last repetition of a last PRS resource of a PRS instance and an end of the measurement window, and wherein the UE is not expected to process PRS resources that are closer than the minimum gap to the end of the measurement window; and
perform one or more positioning measurements of one or more PRS resources during the measurement window up to the duration of PRS.
30. A user equipment (UE), comprising:
means for transmitting, to a network entity, one or more capability messages indicating one or more capabilities of the UE to process positioning reference signals (PRS), wherein the one or more capabilities indicate at least a duration of PRS that the UE can process within a measurement window without a measurement gap, wherein the one or more capabilities indicate a minimum gap between a last repetition of a last PRS resource of a PRS instance and an end of the measurement window, and wherein the UE is not expected to process PRS resources that are closer than the minimum gap to the end of the measurement window; and
means for performing one or more positioning measurements of one or more PRS resources during the measurement window up to the duration of PRS.
31. A non-transitory computer-readable medium storing computer-executable instructions that, when executed by a user equipment (UE), cause the UE to:
transmit, to a network entity, one or more capability messages indicating one or more capabilities of the UE to process positioning reference signals (PRS), wherein the one or more capabilities indicate at least a duration of PRS that the UE can process within a measurement window without a measurement gap, wherein the one or more capabilities indicate a minimum gap between a last repetition of a last PRS resource of a PRS instance and an end of the measurement window, and wherein the UE is not expected to process PRS resources that are closer than the minimum gap to the end of the measurement window; and
perform one or more positioning measurements of one or more PRS resources during the measurement window up to the duration of PRS.