System and methods for supporting uplink and downlink positioning procedures in a wireless network
A position of a user equipment (UE) may be determined using downlink based solutions (e.g. OTDOA), uplink based solutions (e.g. UTDOA), or combined downlink and uplink based solutions (e.g. RTT). The serving gNBs may request neighboring gNBs to produce downlink reference signal transmissions to a target UE and/or measure uplink reference signal transmissions from the target UE. The serving gNB may receive the uplink reference signal measurements from neighboring gNBs and obtain an own uplink reference signal measurement and forward to the UE or another network entity all the uplink reference signal measurements. The UE may use the uplink reference signal measurements, along with the UE's own downlink reference signal measurements to determine RTTs. The serving gNBs or another entity may keep the uplink reference signal measurements and may determine RTTs after receiving the downlink reference signal measurements from the UE.
1 . A method for determining a position of a user equipment (UE) performed by a serving gNB, the method comprising:
receiving a location request for the UE from a requesting entity;
determining a plurality of neighbor gNBs;
sending a request to each neighbor gNB in the plurality of neighbor gNBs to measure uplink reference signal transmissions from the UE;
receiving one or more uplink reference signal measurements measured by each neighbor gNB in the plurality of neighbor gNBs, wherein the one or more uplink reference signal measurements are generated from uplink reference signal transmissions from the UE to the neighbor gNBs; and
transmitting, to at least one of the requesting entity or another entity, based on the one or more uplink reference signal measurements, measurement information for determination of the position of the UE.
2 . The method of claim 1 , wherein determination of the position of the UE is performed using Uplink Time Difference of Arrival (UTDOA) multilateration.
3 . The method of claim 2 , wherein the requesting entity is the UE and wherein assistance data is generated and transmitted to the UE in response to the location request.
4 . The method of claim 2 , further comprising:
generating assistance data for the plurality of neighbor gNBs; and
transmitting the assistance data for the plurality of neighbor gNBs to the UE to enable the UE to transmit the uplink reference signal transmissions to the neighbor gNBs.
5 . The method of claim 2 , wherein the UE is a target device and the requesting entity is an Access and Mobility Function (AMF).
6 . The method of claim 5 , wherein the AMF transmits the location request to the serving gNB based on receiving the location request from another UE.
7 . The method of claim 2 , wherein the UE is a target device and the requesting entity is a Location Management Function (LMF).
8 . The method of claim 7 , wherein the LMF transmits the location request to the serving gNB based on receiving the location request from another UE.
9 . The method of claim 8 , wherein the LMF transmits the location request to the serving gNB further based on obtaining positioning capability information from the target device.
10 . The method of claim 9 , wherein the LMF transmits the location request to the serving gNB further based on determining the plurality of neighbor gNBs.
11 . A gNB configured for determining a position of a user equipment (UE), wherein the gNB is a serving gNB for the UE, comprising:
at least one external interface configured to communicate with the UE, with other gNBs and with entities in a wireless network;
at least one memory;
and at least one processor coupled to the at least one external interface and the at least one memory, the at least one processor configured to:
receive, via the at least one external interface, a location request for the UE from a requesting entity;
determine a plurality of neighbor gNBs;
send a request to each neighbor gNB in the plurality of neighbor gNBs to measure uplink reference signal transmissions from the UE;
receive one or more uplink reference signal measurements measured by each neighbor gNB in the plurality of neighbor gNBs, wherein the one or more uplink reference signal measurements are generated from uplink reference signal transmissions from the UE to the neighbor gNBs; and
transmit, to at least one of the requesting entity or another entity, based on the one or more uplink reference signal measurements, measurement information for determination of the position of the UE.
12 . The gNB of claim 11 , wherein determination of the position of the UE is performed using Uplink Time Difference of Arrival (UTDOA) multilateration.
13 . The gNB of claim 12 , wherein the requesting entity is the UE and wherein assistance data is generated and transmitted to the UE in response to the location request.
14 . The gNB of claim 12 , further comprising:
generating assistance data for the plurality of neighbor gNBs; and
transmitting the assistance data for the plurality of neighbor gNBs to the UE to enable the UE to transmit the uplink reference signal transmissions to the neighbor gNBs.
15 . The gNB of claim 12 , wherein the UE is a target device and the requesting entity is an Access and Mobility Function (AMF).
16 . The gNB of claim 15 , wherein the AMF transmits the location request to the serving gNB based on receiving the location request from another UE.
17 . The gNB of claim 12 , wherein the UE is a target device and the requesting entity is a Location Management Function (LMF).
18 . The gNB of claim 17 , wherein the LMF transmits the location request to the serving gNB based on receiving the location request from another UE.
19 . The gNB of claim 18 , wherein the LMF transmits the location request to the serving gNB further based on obtaining positioning capability information from the target device.
20 . A gNB configured for determining a position of a user equipment (UE), wherein the gNB is a serving gNB for the UE, comprising:
means for receiving a location request for the UE from a requesting entity;
means for determining a plurality of neighbor gNBs;
means for sending a request to each neighbor gNB in the plurality of neighbor gNBs to measure uplink reference signal transmissions from the UE;
means for receiving one or more uplink reference signal measurements measured by each neighbor gNB in the plurality of neighbor gNBs, wherein the one or more uplink reference signal measurements are generated from uplink reference signal transmissions from the UE to the neighbor gNBs; and
means for transmitting, to at least one of the requesting entity or another entity, based on the one or more uplink reference signal measurements, measurement information for determination of the position of the UE.