Positioning method by user device in wireless communication system

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

receiving sounding reference signal (SRS) configuration information and positioning reference signal (PRS) configuration information;

performing listen before talk (LBT) with respect to an unlicensed-band;

transmitting a (SRS) to an anchor node (AN) based on the SRS configuration information on a channel in an idle state according to the LBT among a plurality of channels included in the unlicensed-band;

receiving information related to a Tx−Rx time difference (TRTD) from the AN;

receiving a PRS from the AN based on the PRS configuration information on the channel; and

obtaining round trip time (RTT) based on the SRS, the PRS and the TRTD,

wherein the SRS is transmitted immediately after the LBT is performed, and

wherein the TRTD is a time difference value between a time at which the AN receives the SRS and a time at which the AN transmits the PRS.

2. The method of claim 1 , wherein each of the SRS configuration information and the PRS configuration information includes resource patterns and a number of symbols for a corresponding reference signal.

3. The method of claim 1 , wherein:

the TRTD is represented by first TRTD information and second TRTD information;

the first TRTD information is

⌊

t

CB

T

u

⌋

,

 t CB being the TRTD, and T u being a length of an orthogonal frequency division multiple (OFDM) symbol; and

the second TRTD information is

⌊

t

CB

-

cTRTD_integer

×

T

u

T

x

⌋

,

 cTRTD_integer being the first TRTD information, and T x being a length of a sample of the OFDM symbol.

4. The method of claim 3 ,

wherein, after transmitting the SRS, the information related to the TRTD is received from the AN,

wherein the information related to the TRTD is the second TRTD information, and

wherein the second TRTD information is generated based on a sequence having the same length as the second TRTD information.

5. The method of claim 3 , wherein the second TRTD information is represented based on pattern information of a sequence of the PRS, the pattern information including a comb type and a cyclic shift value of the sequence of the PRS.

6. An apparatus for a user equipment (UE) in a wireless communication system, the apparatus comprising:

at least one processor; and

at least one memory operatively connected to the at least one processor and configured to store at least one instruction for allowing the at least one processor to perform operations,

wherein the operations includes:

receiving sounding reference signal (SRS) configuration information and positioning reference signal (PRS) configuration information;

performing listen before talk (LBT) with respect to an unlicensed-band;

transmitting a SRS to an anchor node (AN) based on the SRS configuration information on a channel in an idle state according to the LBT among a plurality of channels included in the unlicensed-band;

receiving information related to a Tx−Rx time difference (TRTD) from the AN;

receiving a PRS from the AN based on the PRS configuration information on the channel; and

obtaining round trip time (RTT) based on the SRS, the PRS and the TRTD,

wherein the SRS is transmitted immediately after the LBT is performed, and

wherein the TRTD is a time difference value between a time at which the AN receives the SRS and a time at which the AN transmits the PRS.

7. The apparatus of claim 6 , wherein each of the SRS configuration information and the PRS configuration information includes resource patterns and a number of symbols for a corresponding reference signal.

8. The apparatus of claim 6 , wherein:

the TRTD is represented by first TRTD information and second TRTD information;

the first TRTD information is

⌊

t

CB

T

u

⌋

,

 t CB being the TRTD, and T u being a length of an orthogonal frequency division multiple (OFDM) symbol; and

the second TRTD information is

⌊

t

CB

-

cTRTD_integer

×

T

u

T

x

⌋

,

cTRTD_integer being the first TRTD information, and T x being a length of a sample of the OFDM symbol.

9. The apparatus of claim 8 ,

wherein, after transmitting the SRS, the information related to the TRTD is received from the AN,

wherein the information related to the TRTD is the second TRTD information, and

wherein the second TRTD information is generated based on a sequence having the same length as the second TRTD information.

10. The apparatus of claim 8 , wherein the second TRTD information is represented based on pattern information of a sequence of the PRS, the pattern information including a comb type and a cyclic shift value of the sequence of the PRS.

11. The apparatus of claim 6 , wherein the UE is an autonomous driving vehicle or is included in the autonomous driving vehicle.

12. A processor for performing operations for a user equipment (UE) in a wireless communication system, the operations comprising:

receiving sounding reference signal (SRS) configuration information and positioning reference signal (PRS) configuration information;

performing listen before talk (LBT) with respect to an unlicensed-band;

transmitting a SRS to an anchor node (AN) based on the SRS configuration information on a channel in an idle state according to the LBT among a plurality of channels included in the unlicensed-band;

receiving information related to a Tx−Rx time difference (TRTD) from the AN;

receiving a PRS from the AN based on the PRS configuration information on the channel; and

obtaining round trip time (RTT) based on the SRS, the PRS and the TRTD,

wherein the SRS is transmitted immediately after the LBT is performed, and

wherein the TRTD is a time difference value between a time at which the AN receives the SRS and a time at which the AN transmits the PRS.