Using quasi-colocation relationships for neighboring cells in positioning
Disclosed are techniques for wireless communication. In an aspect, a user equipment (UE) may receive system information for a plurality of neighboring cells in one or more system information block type 2 (SIB2) messages, one or more system information block type 4 (SIB4) messages, or both, the system information indicating at least an identifier and a quasi-colocation (QCL) relationship for each neighboring cell of the plurality of neighboring cells. The UE may report, to a location server, identifiers of one or more neighboring cells of the plurality of neighboring cells, the one or more neighboring cells selected from individual neighboring cells in one or more individual sets of neighboring cells of the plurality of neighboring cells, wherein the individual neighboring cells in each individual set of neighboring cells have a common QCL relationship with other individual neighboring cells in the individual set of neighboring cells.
1 . A method of wireless communication performed by a user equipment (UE), comprising:
receiving system information for a plurality of neighboring cells in one or more system information block type 2 (SIB2) messages, one or more system information block type 4 (SIB4) messages, or both, the system information indicating at least an identifier and a quasi-colocation (QCL) relationship for each neighboring cell of the plurality of neighboring cells; and
reporting, to a location server, identifiers of one or more neighboring cells of the plurality of neighboring cells, the one or more neighboring cells selected from individual neighboring cells of one or more individual sets of neighboring cells of the plurality of neighboring cells, wherein the individual neighboring cells in each individual set of neighboring cells have a common QCL relationship with other individual neighboring cells in the individual set of neighboring cells, wherein the reporting is based on the QCL relationships indicated by the received system information.
2 . The method of claim 1 , further comprising:
reporting a subset of the individual neighboring cells from each of the individual sets of neighboring cells to the location server, the subset of the individual neighboring cells having fewer individual neighboring cells than the individual set of neighboring cells from which the subset of the individual neighboring cells is selected.
3 . The method of claim 2 , wherein:
the subset of the individual neighboring cells includes only one neighboring cell.
4 . The method of claim 1 , further comprising:
reporting, to the location server, identifiers of one or more neighboring cells that do not have a QCL relationship with any other neighboring cell of the plurality of neighboring cells.
5 . The method of claim 4 , wherein:
the identifiers of the one or more neighboring cells that do not have a QCL relationship with any other neighboring cell of the plurality of neighboring cells are reported before identifiers of the individual neighboring cells of the one or more individual sets of neighboring cells.
6 . The method of claim 1 , wherein:
the identifiers of the one or more neighboring cells of the plurality of neighboring cells are reported to the location server as part of obtaining an initial fix on a location of the UE during a positioning session.
7 . The method of claim 1 , wherein:
the identifiers of the one or more neighboring cells of the plurality of neighboring cells are reported to the location server based on being inter-frequency to the UE.
8 . The method of claim 1 , wherein:
the identifiers of the one or more neighboring cells of the plurality of neighboring cells reported to the location server includes only neighboring cells having a common QCL type.
9 . A method of operating a location server (LS), comprising:
receiving system information for a plurality of neighboring cells, the system information indicating at least an identifier and a quasi-colocation (QCL) relation for each neighboring cell of the plurality of neighboring cells; and
selecting a subset of neighboring cells from each individual set of one or more individual sets of neighboring cells for providing first assistance data to a UE, wherein the individual neighboring cells in each individual set of neighboring cells have a common QCL relationship with other individual neighboring cells in the individual set of neighboring cells, the subset of neighboring cells having fewer individual neighboring cells than the individual set of neighboring cells from which the subset of neighboring cells is selected; and
transmitting the first assistance data to the UE, the first assistance data including identifiers of one or more of the individual neighboring cells in each subset of neighboring cells.
10 . The method of claim 9 , further comprising:
transmitting, to the UE, second assistance data for neighboring cells that do not have a QCL relationship with any other neighboring cell of the plurality of neighboring cells.
11 . A user equipment (UE), comprising:
a memory;
at least one transceiver; and
at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to:
receive, via the at least one transceiver, system information for a plurality of neighboring cells in one or more system information block type 2 (SIB2) messages, one or more system information block type 4 (SIB4) messages, or both, the system information indicating at least an identifier and a quasi-colocation (QCL) relationship for each neighboring cell of the plurality of neighboring cells; and
report, to a location server via the at least one transceiver, identifiers of one or more neighboring cells of the plurality of neighboring cells, the one or more neighboring cells selected from individual neighboring cells of one or more individual sets of neighboring cells of the plurality of neighboring cells, wherein each individual neighboring cell in each individual set of neighboring cells have a common QCL relationship with other individual neighboring cells in the individual set of neighboring cells, wherein the report is based on the QCL relationships indicated by the received system information.
12 . The UE of claim 11 , wherein the at least one processor is further configured to:
report a subset of the individual neighboring cells from each of the individual sets of neighboring cells to the location server, the subset of the individual neighboring cells having fewer individual neighboring cells than the individual set of neighboring cells from which the subset of the individual neighboring cells is selected.
13 . The UE of claim 12 , wherein:
the subset of the individual neighboring cells includes only one neighboring cell.
14 . The UE of claim 11 , wherein the at least one processor is further configured to:
report, to the location server via the at least one transceiver, identifiers of one or more neighboring cells that do not have a QCL relationship with any other neighboring cell of the plurality of neighboring cells.
15 . The UE of claim 14 , wherein:
the identifiers of the one or more neighboring cells that do not have a QCL relationship with any other neighboring cell of the plurality of neighboring cells are reported before the identifiers of the individual neighboring cells that are selected from the one or more individual sets of neighboring cells.
16 . The UE of claim 11 , wherein:
the identifiers of the one or more neighboring cells of the plurality of neighboring cells are reported to the location server as part of obtaining an initial fix on a location of the UE during a positioning session.
17 . The UE of claim 11 , wherein:
the identifiers of the one or more neighboring cells of the plurality of neighboring cells are reported to the location server based on being inter-frequency to the UE.
18 . The UE of claim 11 , wherein:
the identifiers of the one or more neighboring cells of the plurality of neighboring cells reported to the location server includes only neighboring cells having a common QCL type.
19 . A location server, comprising:
a memory;
at least one transceiver; and
at least one processor communicatively coupled to the memory and the at least one transceiver, the at least one processor configured to:
receive, via the at least one transceiver, system information for a plurality of neighboring cells, the system information indicating at least an identifier and a quasi-colocation (QCL) relation for each neighboring cell of the plurality of neighboring cells; and
select a subset of neighboring cells from each individual set of one or more individual sets of neighboring cells for providing first assistance data to a user equipment (UE), wherein the individual neighboring cells in each individual set of neighboring cells have a common QCL relationship with other neighboring cells in the individual set of neighboring cells, the subset of neighboring cells having fewer neighboring cells than the individual set of the one or more neighboring cells from which the subset of neighboring cells is selected; and
transmit, via the at least one transceiver, the first assistance data to the UE, the first assistance data including identifiers of one or more of the individual neighboring cells in each subset of neighboring cells.
20 . The location server of claim 19 , wherein the at least one processor is further configured to:
transmit, via the at least one transceiver, to the UE, second assistance data for neighboring cells that do not have a QCL relationship with any other neighboring cell of the plurality of neighboring cells.