On-demand positioning reference signal configuration

1 . A method for determining a location of a user equipment, comprising:

transmitting a request for assistance data including a list of downlink positioning reference signal configuration identifiers in order of preference;

receiving assistance data including one or more downlink positioning reference signal configurations based at least in part on the list of downlink positioning reference signal configuration identifiers;

obtaining measurements from one or more positioning reference signals based at least in part on the assistance data; and

determining the location based at least in part on measurements obtained from the one or more positioning reference signals.

2 . The method of claim 1 further comprising receiving multiple downlink positioning reference signal configurations with each downlink positioning reference signal configuration being associated with a downlink positioning reference signal configuration identifier in the list of downlink positioning reference signal configuration identifiers.

3 . The method of claim 2 wherein the multiple downlink positioning reference signal configurations are received via one or more positioning system information blocks transmitted by a base station.

4 . The method of claim 1 further comprising receiving an indication of one or more downlink positioning reference signal configuration parameters which may be modified on-demand.

5 . The method of claim 1 wherein the assistance data is received from a location management function via a Long Term Evolution Positioning Protocol message.

6 . The method of claim 1 wherein transmitting the request for the assistance data includes providing indications of one or more downlink positioning reference signal configuration parameters to be modified.

7 . The method of claim 6 wherein the assistance data includes a downlink positioning reference signal configuration based at least in part on the one or more positioning reference signal configuration parameters to be modified.

8 . The method of claim 6 wherein the one or more positioning reference signal configuration parameters to be modified includes a bandwidth value, a comb size value, a subcarrier spacing value, a time gap value, or combinations thereof.

9 . An apparatus, comprising:

a memory;

at least one transceiver;

at least one processor communicatively coupled to the memory and the at least one transceiver, and configured to:

transmit a request for assistance data including a list of downlink positioning reference signal configuration identifiers in order of preference;

receive assistance data including one or more downlink positioning reference signal configurations based at least in part on the list of downlink positioning reference signal configuration identifiers;

obtain measurements from one or more positioning reference signals based at least in part on the assistance data; and

determine a location based at least in part on the measurements obtained from the one or more positioning reference signals.

10 . The apparatus of claim 9 wherein the at least one processor is further configured to receive multiple downlink positioning reference signal configurations with each downlink positioning reference signal configuration being associated with a downlink positioning reference signal configuration identifier in the list of downlink positioning reference signal configuration identifiers.

11 . The apparatus of claim 10 wherein the at least one processor is further configured to receive the multiple downlink positioning reference signal configurations via one or more positioning system information blocks transmitted by a base station.

12 . The apparatus of claim 9 wherein the at least one processor is further configured to receive an indication of one or more down link positioning reference signal configuration parameters which may be modified on-demand.

13 . The apparatus of claim 9 wherein the at least one processor is further configured to receive the assistance data via a Long Term Evolution Positioning Protocol message.

14 . The apparatus of claim 9 wherein the at least one processor is further configured to transmit an indication of one or more downlink positioning reference signal configuration parameters to be modified.

15 . The apparatus of claim 14 wherein the assistance data includes a downlink positioning reference signal configuration based at least in part on the one or more positioning reference signal configuration parameters to be modified.

16 . The apparatus of claim 15 wherein the one or more positioning reference signal configuration parameters to be modified includes a bandwidth value, a comb size value, a subcarrier spacing value, a time gap value, or combinations thereof.

17 . An apparatus for determining a location of a user equipment, comprising:

means for transmitting a request for assistance data including a list of downlink positioning reference signal configuration identifiers in order of preference;

means for receiving assistance data including one or more downlink positioning reference signal configurations based at least in part on the list of downlink positioning reference signal configuration identifiers;

means for obtaining measurements from one or more positioning reference signals based at least in part on the assistance data; and

means for determining the location based at least in part on measurements obtained from the one or more positioning reference signals.

18 . The apparatus of claim 17 further comprising means for receiving multiple downlink positioning reference signal configurations with each downlink positioning reference signal configuration being associated with a downlink positioning reference signal configuration identifier in the list of downlink positioning reference signal configuration identifiers.

19 . The apparatus of claim 18 wherein the multiple downlink positioning reference signal configurations are received via one or more positioning system information blocks transmitted by a base station.

20 . The apparatus of claim 17 further comprising means for receiving an indication of one or more downlink positioning reference signal configuration parameters which may be modified on-demand.

21 . The apparatus of claim 17 wherein the assistance data is received from a location management function via a Long Term Evolution Positioning Protocol message.

22 . The apparatus of claim 17 wherein transmitting the request for the assistance data includes providing indications of one or more downlink positioning reference signal configuration parameters to be modified.

23 . The apparatus of claim 22 wherein the assistance data includes a downlink positioning reference signal configuration based at least in part on the one or more positioning reference signal configuration parameters to be modified.

24 . The apparatus of claim 22 wherein the one or more positioning reference signal configuration parameters to be modified includes a bandwidth value, a comb size value, a subcarrier spacing value, a time gap value, or combinations thereof.

25 . A non-transitory processor-readable storage medium comprising processor-readable instructions configured to cause one or more processors to determine a location of a user equipment, comprising:

code for transmitting a request for assistance data including a list of downlink positioning reference signal configuration identifiers in order of preference;

code for receiving assistance data including one or more downlink positioning reference signal configurations based at least in part on the list of downlink positioning reference signal configuration identifiers;

code for obtaining measurements from one or more positioning reference signals based at least in part on the assistance data; and

code for determining the location based at least in part on measurements obtained from the one or more positioning reference signals.

26 . The non-transitory processor-readable storage medium of claim 25 further comprising code for receiving multiple downlink positioning reference signal configurations with each downlink positioning reference signal configuration being associated with a downlink positioning reference signal configuration identifier in the list of downlink positioning reference signal configuration identifiers.

27 . The non-transitory processor-readable storage medium of claim 25 further comprising code for receiving an indication of one or more downlink positioning reference signal configuration parameters which may be modified on-demand.

28 . The non-transitory processor-readable storage medium of claim 25 wherein the code for transmitting the request for the assistance data includes code for providing indications of one or more downlink positioning reference signal configuration parameters to be modified.

29 . The non-transitory processor-readable storage medium of claim 28 wherein the assistance data includes a downlink positioning reference signal configuration based at least in part on the one or more positioning reference signal configuration parameters to be modified.

30 . The non-transitory processor-readable storage medium of claim 28 wherein the one or more positioning reference signal configuration parameters to be modified includes a bandwidth value, a comb size value, a subcarrier spacing value, a time gap value, or combinations thereof.