Method and user equipment for receiving positioning reference signal, and base station for transmitting positioning reference signal

1. A method performed by a user equipment (UE) in a wireless communication system, the method comprising:

receiving a plurality of synchronization signal blocks (SSBs);

performing measurements based on the plurality of SSBs;

transmitting first request information related to positioning reference signal (PRS) transmissions based on the measurements;

receiving a positioning related configuration based on transmitting the first request information; and

receiving at least one PRS based on the positioning related configuration,

wherein the plurality of SSBs are received based on a plurality of downlink beams directed in different directions,

wherein the first request information includes information regarding a first SSB,

wherein the first SSB is determined based on a predetermined condition related to the measurements from among the plurality of SSBs,

wherein the positioning related configuration includes information related to a reference PRS resource for a reference timing for a reference signal time difference (RSTD), and

wherein the reference PRS resource is related to a same downlink beam as that for the first SSB.

2. The method according to claim 1 , wherein the first request information is related to requesting a change of an index of an SSB configured with quasi-colocation (QCL) type-D with the first PRS, and

wherein the first SSB is determined to be an SSB with the changed index.

3. The method according to claim 1 , wherein the predetermined condition related to the measurements comprises at least:

(i) a first condition related to having a minimum of propagation times measured in the plurality of respective SSBs;

(ii) a second condition related to having a minimum of time of arrivals (ToAs) measured in the plurality of respective SSBs;

(iii) a third condition related to having a minimum of time of flights (ToFs) measured in the plurality of respective SSBs; or

(iv) a fourth condition related to having a maximum of time of reference signal reception powers (RSRPs) measured in the plurality of respective SSBs.

4. The method according to claim 1 ,

wherein the at least one PRS comprises a first PRS and a second PRS, and

wherein the method further comprises:

transmitting information related to a RSTD value based on the reference timing, the first PRS, and the second PRS.

5. The method according to claim 4 , wherein the first PRS and the second PRS are received from a plurality of transmission points (TPs), and

wherein the positioning related configuration further includes information related to a reference TP for the reference timing among the plurality of TPs.

6. A user equipment (UE) configured to operate in a wireless communication system, the UE comprising:

a transceiver;

at least one processor coupled to the transceiver; and

at least one memory storing instructions that cause the at least one processor to perform operations comprising:

receiving a plurality of synchronization signal blocks (SSBs);

performing measurements based on the plurality of SSBs;

transmitting first request information related to positioning reference signal (PRS) transmissions based on the measurements;

receiving a positioning related configuration based on the first request information; and

receiving at least one PRS based on the positioning related configuration,

wherein the plurality of SSBs are received based on a plurality of downlink beams directed in different directions,

wherein the first request information includes information regarding a first SSB,

wherein the first SSB is determined based on a predetermined condition related to the measurements from among the plurality of SSBs,

wherein the positioning related configuration includes information related to a reference PRS resource for a reference timing for a reference signal time difference (RSTD), and

wherein the reference PRS resource is related to a same downlink beam as that for the first SSB.

7. The UE according to claim 6 , wherein the predetermined condition related to the measurements comprises at least:

(i) a first condition related to having a minimum of propagation times measured in the plurality of respective SSBs;

(ii) a second condition related to having a minimum of time of arrivals (ToAs) measured in the plurality of respective SSBs;

(iii) a third condition related to having a minimum of time of flights (ToFs) measured in the plurality of respective SSBs; or

(iv) a fourth condition related to having a maximum of time of reference signal reception powers (RSRPs) measured in the plurality of respective SSBs.

8. The UE according to claim 6 ,

wherein the at least one PRS comprises a first PRS and a second PRS, and

wherein the operations further comprise:

transmitting information related to a RSTD value based on the reference timing, the first PRS, and the second PRS.

9. The UE according to claim 6 , wherein the operations further comprise communicating with at least one of another UE, a network, or an autonomous driving vehicle other than a vehicle comprising the UE.

10. A base station configured to operate in a wireless communication system, the base station comprising:

a transceiver;

at least one processor coupled to the transceiver; and

at least one memory storing instructions that cause the at least one processor to perform operations comprising:

transmitting a plurality of synchronization signal blocks (SSBs);

receiving first request information related to positioning reference signal (PRS) transmissions from a user equipment (UE);

transmitting a positioning related configuration to the UE based on the first request information; and

transmitting at least one PRS based on the positioning related configuration,

wherein the plurality of SSBs are transmitted based on a plurality of downlink beams directed in different directions,

wherein the first request information includes information regarding a first SSB,

wherein the positioning related configuration includes information related to a reference PRS resource for a reference timing for a reference signal time difference (RSTD), and

wherein the reference PRS resource is related to a same downlink beam as that for the first SSB.