Sidelink positioning reference signal resource configuration
Disclosed are techniques for communication. In an aspect, a position estimation entity determines a sidelink positioning reference signal (SL-PRS) resource configuration associated with a positioning measurement procedure. The position estimation entity transmits an indication of the SL-PRS resource configuration (e.g., to first and/or second UEs). The UE(s) obtain the SL-PRS resource configuration, and perform the positioning measurement procedure in accordance with the SL-PRS resource configuration.
1 . A method of operating a first user equipment (UE), comprising:
obtaining a sidelink positioning reference signal (SL-PRS) resource configuration associated with a positioning measurement procedure that comprises a first SL-PRS between the first UE and a second UE in a first transmission direction, a second SL-PRS between the first UE and the second UE in the first transmission direction that is offset in time from the first SL-PRS by a time offset, and a third SL-PRS between the first UE and the second UE in a second transmission direction, wherein the SL-PRS resource configuration configures resources for the first SL-PRS, the second SL-PRS and the third SL-PRS; and
performing the positioning measurement procedure with the second UE in accordance with the SL-PRS resource configuration.
2 . The method of claim 1 ,
wherein the SL-PRS resource configuration is determined independently at the first UE and transmitted to the second UE, or
wherein the SL-PRS resource configuration is received from the second UE.
3 . The method of claim 1 , wherein the first transmission direction is from the first UE to the second UE, such the first and second SL-PRSs are transmitted from the first UE to the second UE and the third SL-PRS is transmitted from the second UE to the first UE.
4 . The method of claim 1 , wherein the first transmission direction is from the second UE to the first UE, such the first and second SL-PRSs are transmitted from the second UE to the first UE and the third SL-PRS is transmitted from the first UE to the second UE.
5 . The method of claim 1 , wherein the positioning measurement procedure includes measuring at least one receive-transmit (Rx-Tx) time difference associated with at least one of the first, second and third SL-PRSs.
6 . The method of claim 1 ,
wherein the third SL-PRS is earlier than the first and second SL-PRSs, or
wherein the third SL-PRS is later than the first and second SL-PRSs, or
wherein the third SL-PRS is between than the first and second SL-PRSs.
7 . The method of claim 6 ,
wherein the SL-PRS resource configuration is determined independently at the first UE and transmitted to the second UE, and an earliest of the first, second and third SL-PRSs is transmitted by the first UE, or
wherein the SL-PRS resource configuration is received from the second UE, and the earliest of the first, second and third SL-PRSs is received at the first UE from the second UE.
8 . The method of claim 1 , wherein the first, second and third SL-PRSs are scheduled aperiodically, semi-periodically, or periodically.
9 . The method of claim 1 , further comprising:
transmitting a measurement report comprising measurement information that is based on one or more receive-transmit (Rx-Tx) time differences associated with one or more of the first, second and third SL-PRSs.
10 . The method of claim 9 , wherein the one or more Rx-Tx time differences associated with the first and second SL-PRSs in the measurement report are based on timestamps derived on the same time basis.
11 . The method of claim 9 ,
wherein the first and second SL-PRSs are transmitted based on the same time basis.
12 . The method of claim 1 , wherein the first, second and third SL-PRSs are scheduled periodically.
13 . The method of claim 12 , wherein the first, second and third SL-PRSs are scheduled with the same respective periodicity.
14 . The method of claim 13 , wherein the time offset between the first and second SL-PRSs corresponds to half of the respective periodicity.
15 . The method of claim 1 , wherein the SL-PRS resource configuration is asymmetric such that a first time differential between the third SL-PRS and the first SL-PRS is different than a second time differential between the third SL-PRS and the second SL-PRS.
16 . The method of claim 15 , wherein the time offset is greater than a minimum time offset threshold associated with the asymmetric SL-PRS resource configuration.
17 . The method of claim 16 , wherein the minimum time offset threshold is based on a bandwidth associated with the first and second SL-PRSs.
18 . A method of operating a position estimation entity, comprising:
determining a sidelink positioning reference signal (SL-PRS) resource configuration associated with a positioning measurement procedure that comprises a first SL-PRS between a first user equipment (UE) and a second UE in a first transmission direction, a second SL-PRS between the first UE and the second UE in the first transmission direction that is offset in time from the first SL-PRS by a time offset, and a third SL-PRS between the first UE and the second UE in a second transmission direction, wherein the SL-PRS resource configuration configures resources for the first SL-PRS, the second SL-PRS and the third SL-PRS; and
transmitting an indication of the SL-PRS resource configuration.
19 . The method of claim 18 , wherein the position estimation entity corresponds to the first UE, the second UE, a base station, a location server, or a location management function (LMF).
20 . The method of claim 18 , further comprising:
receiving, from the first UE or the second UE, a measurement report comprising measurement information that is based on a first receive-transmit (Rx-Tx) time difference associated with the first PRS by and a second Rx-Tx time difference associated with the second PRS in accordance with the SL-PRS resource configuration.
21 . The method of claim 20 ,
wherein the first and second SL-PRSs are transmitted based on the same time basis.
22 . The method of claim 20 , further comprising:
determining a clock drift between the first and second Rx-Tx time differences; and
determining a position estimate of one of the first and second UEs based at least in part upon the clock drift.
23 . The method of claim 18 , wherein the first transmission direction is from the first UE to the second UE, such the first and second SL-PRSs are transmitted from the first UE to the second UE and the third SL-PRS is transmitted from the second UE to the first UE.
24 . The method of claim 18 , wherein the first transmission direction is from the second UE to the first UE, such the first and second SL-PRSs are transmitted from the second UE to the first UE and the third SL-PRS is transmitted from the first UE to the second UE.
25 . The method of claim 18 ,
wherein the third SL-PRS is earlier than the first and second SL-PRSs, or
wherein the third SL-PRS is later than the first and second SL-PRSs, or
wherein the third SL-PRS is between than the first and second SL-PRSs.
26 . The method of claim 18 ,
wherein the position estimation entity corresponds to the first UE, and an earliest of the first, second and third SL-PRSs is transmitted by the first UE, or
wherein the position estimation entity corresponds to the second UE, and the earliest of the first, second and third SL-PRSs is received at the first UE from the second UE.
27 . The method of claim 18 , wherein the SL-PRS resource configuration is asymmetric such that a first time differential between the third SL-PRS and the first SL-PRS is different than a second time differential between the third SL-PRS and the second SL-PRS.
28 . The method of claim 18 , wherein the SL-PRS resource configuration is symmetric such that a first time differential between the third SL-PRS and the first SL-PRS is the same as a second time differential between the third SL-PRS and the second SL-PRS.
29 . A first user equipment (UE), comprising:
a memory;
a communication interface; and
at least one processor communicatively coupled to the memory and the communication interface, the at least one processor configured to:
obtain a sidelink positioning reference signal (SL-PRS) resource configuration associated with a positioning measurement procedure that comprises a first SL-PRS between the first UE and a second UE in a first transmission direction, a second SL-PRS between the first UE and the second UE in the first transmission direction that is offset in time from the first SL-PRS by a time offset, and a third SL-PRS between the first UE and the second UE in a second transmission direction, wherein the SL-PRS resource configuration configures resources for the first SL-PRS, the second SL-PRS and the third SL-PRS; and
perform the positioning measurement procedure with the second UE in accordance with the SL-PRS resource configuration.
30 . The first UE of claim 29 ,
wherein the SL-PRS resource configuration is determined independently at the first UE and transmitted to the second UE, or
wherein the SL-PRS resource configuration is received from the second UE.
31 . The first UE of claim 29 , wherein the first transmission direction is from the first UE to the second UE, such the first and second SL-PRSs are transmitted from the first UE to the second UE and the third SL-PRS is transmitted from the second UE to the first UE.
32 . The first UE of claim 29 , wherein the first transmission direction is from the second UE to the first UE, such the first and second SL-PRSs are transmitted from the second UE to the first UE and the third SL-PRS is transmitted from the first UE to the second UE.
33 . The first UE of claim 29 , wherein the positioning measurement procedure includes measuring at least one receive-transmit (Rx-Tx) time difference associated with at least one of the first, second and third SL-PRSs.
34 . The first UE of claim 29 ,
wherein the third SL-PRS is earlier than the first and second SL-PRSs, or
wherein the third SL-PRS is later than the first and second SL-PRSs, or
wherein the third SL-PRS is between than the first and second SL-PRSs.
35 . The first UE of claim 34 ,
wherein the SL-PRS resource configuration is determined independently at the first UE and transmitted to the second UE, and an earliest of the first, second and third SL-PRSs is transmitted by the first UE, or
wherein the SL-PRS resource configuration is received from the second UE, and the earliest of the first, second and third SL-PRSs is received at the first UE from the second UE.
36 . The first UE of claim 29 , wherein the first, second and third SL-PRSs are scheduled aperiodically, semi-periodically, or periodically.
37 . The first UE of claim 29 , wherein the at least one processor is further configured to:
cause the communication interface to transmit a measurement report comprising measurement information that is based on one or more receive-transmit (Rx-Tx) time differences associated with one or more of the first, second and third SL-PRSs.
38 . The first UE of claim 37 , wherein the one or more Rx-Tx time differences associated with the first and second SL-PRSs in the measurement report are based on timestamps derived on the same time basis.
39 . The first UE of claim 37 ,
wherein the first and second SL-PRSs are transmitted based on the same time basis.
40 . The first UE of claim 29 , wherein the first, second and third SL-PRSs are scheduled periodically.
41 . The first UE of claim 40 , wherein the first, second and third SL-PRSs are scheduled with the same respective periodicity.
42 . The first UE of claim 41 , wherein the time offset between the first and second SL-PRSs corresponds to half of the respective periodicity.
43 . The first UE of claim 29 , wherein the SL-PRS resource configuration is asymmetric such that a first time differential between the third SL-PRS and the first SL-PRS is different than a second time differential between the third SL-PRS and the second SL-PRS.
44 . The first UE of claim 43 , wherein the time offset is greater than a minimum time offset threshold associated with the asymmetric SL-PRS resource configuration.
45 . The first UE of claim 44 , wherein the minimum time offset threshold is based on a bandwidth associated with the first and second SL-PRSs.
46 . A position estimation entity, comprising:
a memory;
a communication interface; and
at least one processor communicatively coupled to the memory and the communication interface, the at least one processor configured to:
determine a sidelink positioning reference signal (SL-PRS) resource configuration associated with a positioning measurement procedure that comprises a first SL-PRS between a first user equipment (UE) and a second UE in a first transmission direction, a second SL-PRS between the first UE and the second UE in the first transmission direction that is offset in time from the first SL-PRS by a time offset, and a third SL-PRS between the first UE and the second UE in a second transmission direction, wherein the SL-PRS resource configuration configures resources for the first SL-PRS, the second SL-PRS and the third SL-PRS; and
cause the communication interface to transmit an indication of the SL-PRS resource configuration.
47 . The position estimation entity of claim 46 , wherein the position estimation entity corresponds to the first UE, the second UE, a base station, a location server, or a location management function (LMF).
48 . The position estimation entity of claim 46 , wherein the at least one processor is further configured to:
receive, via the communication interface, from the first UE or the second UE, a measurement report comprising measurement information that is based on a first receive-transmit (Rx-Tx) time difference associated with the first PRS by and a second Rx-Tx time difference associated with the second PRS in accordance with the SL-PRS resource configuration.
49 . The position estimation entity of claim 48 ,
wherein the first and second SL-PRSs are transmitted based on the same time basis.
50 . The position estimation entity of claim 48 , wherein the at least one processor is further configured to:
determine a clock drift between the first and second Rx-Tx time differences; and
determine a position estimate of one of the first and second UEs based at least in part upon the clock drift.
51 . The position estimation entity of claim 46 , wherein the first transmission direction is from the first UE to the second UE, such the first and second SL-PRSs are transmitted from the first UE to the second UE and the third SL-PRS is transmitted from the second UE to the first UE.
52 . The position estimation entity of claim 46 , wherein the first transmission direction is from the second UE to the first UE, such the first and second SL-PRSs are transmitted from the second UE to the first UE and the third SL-PRS is transmitted from the first UE to the second UE.
53 . The position estimation entity of claim 46 ,
wherein the third SL-PRS is earlier than the first and second SL-PRSs, or
wherein the third SL-PRS is later than the first and second SL-PRSs, or
wherein the third SL-PRS is between than the first and second SL-PRSs.
54 . The position estimation entity of claim 46 ,
wherein the position estimation entity corresponds to the first UE, and an earliest of the first, second and third SL-PRSs is transmitted by the first UE, or
wherein the position estimation entity corresponds to the second UE, and the earliest of the first, second and third SL-PRSs is received at the first UE from the second UE.
55 . The position estimation entity of claim 46 , wherein the SL-PRS resource configuration is asymmetric such that a first time differential between the third SL-PRS and the first SL-PRS is different than a second time differential between the third SL-PRS and the second SL-PRS.
56 . The position estimation entity of claim 46 , wherein the SL-PRS resource configuration is symmetric such that a first time differential between the third SL-PRS and the first SL-PRS is the same as a second time differential between the third SL-PRS and the second SL-PRS.