Facilitating time-aligned measurements for user equipments (UEs) and base stations for positioning
Disclosed are techniques for communication. In an aspect, a location server transmits a first request to at least a first network node, the first request including at least a first set of parameters indicating one or more first time instances during which the first network node is expected to perform and report one or more first positioning measurements of periodic positioning reference signals transmitted by a second network node during a plurality of periodic time instances, the plurality of periodic time instances including the one or more first time instances, and receives a first measurement report from the first network node, the first measurement report including the one or more first positioning measurements of the periodic positioning reference signals transmitted by the second network node during the one or more first time instances.
1 . A method of communication performed by a location server, comprising:
transmitting, to a first network node, a first set of parameters indicating time and frequency information related to transmission of periodic positioning reference signals by a second network node;
transmitting a first request to at least the first network node, the first request including at least a second set of parameters indicating one or more first time instances of a plurality of periodic time instances during which the first network node is expected to perform and report one or more first positioning measurements; and
receiving a first measurement report from the first network node, the first measurement report including the one or more first positioning measurements of the periodic positioning reference signals transmitted by the second network node during the one or more first time instances, wherein the second set of parameters comprises a system frame number (SFN) offset or an SFN-plus-slot offset, the one or more first time instances comprise one or more system frames or one or more slots, and the SFN offset identifies the one or more system frames or the SFN-plus-slot offset identifies the one or more slots.
2 . The method of claim 1 , wherein the second set of parameters comprises a measurement periodicity parameter and an offset parameter.
3 . The method of claim 1 , wherein:
the second network node is a user equipment (UE),
the first network node is a base station or a sidelink UE, and
the periodic positioning reference signals are periodic sounding reference signals (SRS) or sidelink positioning reference signals (SL-PRS).
4 . The method of claim 3 , wherein the UE does not have an active communication connection to the base station or the sidelink UE.
5 . The method of claim 1 , wherein:
the first network node is a UE,
the second network node is a base station or a sidelink UE, and
the periodic positioning reference signals are periodic New Radio (NR) or Long-Term Evolution (LTE) positioning reference signals (PRS) or SL-PRS.
6 . The method of claim 5 , wherein the UE has an active communication connection with the base station or the sidelink UE.
7 . The method of claim 5 , wherein the first request is a MEASUREMENT REQUEST message of a measurement procedure between the location server and the base station.
8 . The method of claim 1 , wherein:
the second network node is a UE,
the first network node is a neighboring base station of the UE or a sidelink UE with which the UE does not have an active communication connection, and
the second set of parameters specify a measurement window that includes at least the one or more first time instances.
9 . The method of claim 8 , wherein the second set of parameters comprise a start of the measurement window and an end of the measurement window.
10 . The method of claim 8 , wherein the second set of parameters comprise a start of the measurement window and a length of the measurement window.
11 . The method of claim 1 , wherein the one or more first positioning measurements comprise one or more time of arrival (ToA) measurements, one or more reference signal time difference (RSTD) measurements, one or more reception-to-transmission (Rx-Tx) time difference measurements, reference signal received power (RSRP) measurements, received signal strength indicator (RSSI) measurements, angle-based measurements, or any combination thereof.
12 . The method of claim 1 , further comprising:
transmitting, to a third network node, the first set of parameters indicating time and frequency information related to transmission of the periodic positioning reference signals by the second network node;
transmitting a second request to the third network node, the second request including at least a third set of parameters indicating one or more second time instances of the plurality of periodic time instances during which the third network node is expected to perform and report one or more second positioning measurements; and
receiving a second measurement report from the third network node, the second measurement report including the one or more second positioning measurements.
13 . The method of claim 12 , wherein:
the second network node is a UE,
the first network node is a first base station involved in a positioning session with the UE, and
the third network node is a second base station involved in the positioning session with the UE.
14 . The method of claim 12 , wherein:
the second network node is a base station,
the first network node is a first UE involved in a positioning session with the base station, and
the third network node is a second UE involved in a positioning session with the base station.
15 . The method of claim 12 , wherein:
the one or more second time instances are different than the one or more first time instances.
16 . The method of claim 1 , further comprising:
calculating an estimate of a location of the second network node.
17 . A method of communication performed by a location server, comprising:
transmitting, to a first network node, a first set of parameters indicating a time-domain periodicity and frequency allocation for transmission of periodic positioning reference signals by a second network node; and
transmitting a first request to the first network node, the first request including at least a second set of parameters indicating at least one or more first time instances of a plurality of periodic time instances during which the first network node is requested to configure the second node to transmit the periodic positioning reference signals, wherein the second set of parameters comprises a system frame number (SFN) offset or an SFN-plus-slot offset, the one or more first time instances comprise one or more system frames or one or more slots, and the SFN offset identifies the one or more system frames or the SFN-plus-slot offset identifies the one or more slots.
18 . The method of claim 17 , wherein the second set of parameters indicating at least the one or more first time instances of the plurality of periodic time instances comprises at least a time-domain offset parameter.
19 . The method of claim 18 , wherein:
the second network node is a user equipment (UE),
the first network node is a serving base station of the UE, and
the periodic positioning reference signals are periodic sounding reference signals (SRS).
20 . The method of claim 18 , wherein:
the first network node is a UE,
the second network node is a base station or a sidelink UE with which the UE has an active communication connection, and
the periodic positioning reference signals are periodic New Radio (NR) or Long-Term Evolution (LTE) positioning reference signals (PRS) or sidelink PRS (SL-PRS).
21 . The method of claim 17 , wherein:
the second network node is a UE,
the first network node is a serving base station of the UE,
the second set of parameters specify a transmission window that includes the one or more first time instances, and
the serving base station is expected to configure the UE to transmit the periodic positioning reference signals at least during the one or more first time instances based on the transmission window.
22 . The method of claim 17 , further comprising:
calculating an estimate of a location of the second network node.
23 . A method of communication performed by a base station, comprising:
receiving a request from a location server, the request including at least a set of parameters indicating one or more time instances during which a user equipment (UE) is expected to transmit periodic sounding reference signals (SRS), wherein the set of parameters includes a system frame number (SFN) offset or an SFN-plus-slot offset;
configuring the UE to transmit the periodic SRS at least during the one or more time instances, wherein the one or more time instances include one or more system frames or one or more slots, and the SFN offset identifies the one or more system frames or the SFN-plus-offset identifies the one or more slots; and
determining whether to transmit, to the UE, a timing adjust (TA) update related to the periodic SRS within the one or more time instances, whether to avoid scheduling higher priority traffic during the one or more time instances, whether to request the UE to feedback to the base station any autonomous timing adjustments associated with the one or more time instances, or any combination thereof.
24 . The method of claim 23 , wherein the higher priority traffic includes aperiodic SRS, semi-persistent SRS, or both.
25 . The method of claim 23 , wherein the autonomous timing adjustments comprise an autonomous TA update or other transmission timing adjustment.
26 . The method of claim 23 , further comprising:
refraining from scheduling higher priority traffic during the one or more time instances.
27 . The method of claim 23 , further comprising:
transmitting a request to the UE to feedback to the base station any autonomous timing adjustments associated with the one or more time instances.
28 . A method of wireless communication performed by a user equipment (UE), comprising:
receiving a request from a location server, the request including a configuration for the UE to report any timing adjustments associated with one or more time instances during which the UE is configured to transmit periodic sounding reference signals (SRS), wherein the configuration includes a set of parameters that include a system frame number (SFN) offset or an SFN-plus-slot offset;
performing a timing adjustment of the periodic SRS during at least one of the one or more time instances, wherein the one or more time instances include one or more system frames or one or more slots, and the SFN offset identifies the one or more system frames or the SFN-plus-offset identifies the one or more slots; and
transmitting an indication of the timing adjustment to the location server.