Method and device for performing location measurement on basis of PDOA
Provided is a method by which a terminal performs location measurement on the basis of a PDOA in a wireless communication system, according to one embodiment of the present description, wherein the method, by which a terminal performs location measurement on the basis of PDOA, comprises: a step for receiving, from a base station, a signal through a plurality of paths; a step for acquiring phase difference information on each of the plurality of paths; and a step for reporting, to the base station, the phase difference information on the basis of the reference signal. The terminal is capable of communicating with at least one of another terminal, a terminal related to an autonomous driving vehicle, the base station, or a network.
1. A method of performing location measurement based on phase difference of arrival (PDOA) by a user equipment (UE) in a wireless communication system, the method comprising:
receiving signals through multiple paths from a base station (BS);
acquiring phase difference information about each of the multiple paths; and
reporting, to the BS, at least part of the phase difference information based on reference signals,
wherein the at least part of the phase difference information that is reported to the BS only relates to signals having a strength that is greater than or equal to a threshold, among the signals that are received through the multiple paths, and
wherein, based on a number of the reference signals being fewer than a number of the signals having the strength that is greater than or equal to the threshold, the at least part of the phase difference information related to the number of the reference signals is reported to the BS in an order of signals having a smaller phase difference.
2. The method of claim 1 , wherein the UE reports, to the BS, capability information as to whether the UE is capable of distinguishing between signals for the multiple paths and acquiring the phase difference information about each of the multiple paths.
3. The method of claim 1 , wherein only a signal related with a path having a smallest phase difference among signals for the multiple paths is transmitted to the BS.
4. The method of claim 3 , wherein the UE transmits only the signal related with the path having the smallest phase difference to the BS, based on reporting of information about a distance between the UE and the BS to the BS.
5. The method of claim 4 , wherein the UE transmits information about all phase differences of the signals for the multiple paths to the BS, based on reporting of information about a location of the UE to the BS.
6. The method of claim 5 , wherein whether the UE is to report the information about the distance or the information about the location to the BS is set based on a higher layer signal.
7. The method of claim 1 , wherein the reporting of the phase difference information based on the reference signals to the BS is set based on a higher layer signal.
8. A user equipment (UE) configured to perform location measurement based on phase difference of arrival (PDOA) in a wireless communication system, the UE comprising:
a receiver configured to receive a signal;
a transmitter configured to transmit a signal; and
a processor configured to control the receiver and the transmitter,
wherein the processor is further configured to:
receive, through the receiver, signals through multiple paths from a base station (BS),
acquire phase difference information about each of the multiple paths, and
report, to the BS through the transmitter, at least part of the phase difference information based on reference signals,
wherein the at least part of the phase difference information that is reported to the BS only relates to signals having a strength that is greater than or equal to a threshold, among the signals that are received through the multiple paths, and
wherein, based on a number of the reference signals being fewer than a number of the signals having the strength that is greater than or equal to the threshold, the at least part of the phase difference information related to the number of the reference signals is reported to the BS in an order of signals having a smaller phase difference.
9. The UE of claim 8 , wherein the processor reports, to the BS, capability information as to whether the UE is capable of distinguishing between signals for the multiple paths and acquiring the phase difference information about each of the multiple paths.
10. The UE of claim 8 , wherein only a signal related with a path having a smallest phase difference among signals for the multiple paths is transmitted to the BS.
11. The UE of claim 10 , wherein the processor transmits only the signal related with the path having the smallest phase difference to the BS, based on reporting of information about a distance between the UE and the BS to the BS.
12. The UE of claim 8 , wherein the UE is capable of communicating with at least one of another UE, a UE related to an autonomous driving vehicle, a base station or a network.