Method for performing OTDOA-related operations in wireless communication system
One embodiment of the present invention relates to a method by which a terminal performs observed time difference of arrival (OTDOA)-related operations in a wireless communication system, the method comprising the steps of: receiving a ProvideAssistanceData message from a server; receiving a RequestLocationInformation message from the server; measuring a reference signal time difference (RSTD) on the basis of a reference cell after receiving the RequestLocationInformation message; and transmitting the RSTD measurement result to the server, wherein the reference cell is a reference cell indicated by information included in the ProvideAssistanceData or is selected by the terminal from among a plurality of cells indicated by the information included in the ProvideAssistanceData.
1. A method of performing an OTDOA (observed time difference of arrival)-related operation, which is performed by a User Equipment (UE) in a wireless communication system, the method comprising:
transmitting, to a server, capability information on whether a Reference Signal Time Difference (RSTD) for multiple reference cells can be measured and reported;
receiving a ProvideAssistanceData message including information on a plurality of reference cells determined based on the capability information and information on neighboring cells from the server,
wherein the number of the plurality of reference cells is determined according to the capability information;
receiving a RequestLocationInformation message from the server;
measuring the RSTD for each of the plurality of reference cells using the neighboring cells after the RequestLocationInformation message is received; and
transmitting measurement results of the RSTD related to each of the plurality of reference cells to the server.
2. The method of claim 1 , wherein the measurement result of the RSTD is contained in a ProvideLocationInformation message.
3. The method of claim 1 , wherein a ProvideLocationInformation message mandatorily comprises quality information of the plurality of reference cells.
4. The method of claim 3 , wherein the quality information of the plurality of reference cells comprises OTDOA-MeasQuality.
5. The method of claim 4 , wherein the OTDOA-MeasQuality comprises the best estimation value of the UE for the uncertainty of OTDOA measurement.
6. A User Equipment (UE) performing an OTDOA (observed time difference of arrival)-related operation in a wireless communication system, the UE comprising:
a transmitter;
a receiver; and
a processor configured to:
transmit, to a server, capability information on whether Reference Signal Time Difference (RSTD) for multiple reference cells can be measured and reported,
receive a ProvideAssistanceData message including information on a plurality of reference cells determined based on the capability information and information on neighboring cells from the server,
wherein the number of the plurality of reference cells is determined according to the capability information,
receive a RequestLocationInformation message from the server,
measure the RSTD for each of the plurality of reference cells using neighboring cells after the RequestLocationInformation message is received, and
transmit measurement results of the RSTD related to each of the plurality of reference cells to the server.
7. The UE of claim 6 , wherein the measurement result of the RSTD is contained in a ProvideLocationInformation message.
8. The UE of claim 7 , wherein a ProvideLocationInformation message mandatorily comprises quality information of the plurality of reference cells.
9. The UE of claim 8 , wherein the quality information of the plurality of reference cells comprises OTDOA-MeasQuality.
10. The UE of claim 9 , wherein the OTDOA-MeasQuality comprises the best estimation value of the processor for the uncertainty of OTDOA measurement.