Method for locating terminal in wireless communication system and device therefor

An apparatus for reporting a Reference Signal Timing Difference (RSTD) value in a wireless communication system, the apparatus comprising:

• at least one processor;
• and
• at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations comprising:
• transmitting a random access preamble related to a Synchronization Signal/Physical Broadcast Channel Block (SS/PBCH) block received from a specific cell included in a plurality of cells;
• establishing an RRC connection to the specific cell by requesting a Radio Resource Control (RRC) connection based on a Random Access Response (RAR) received from the specific cell;
• receiving, from a location server, a cell group identifier for a cell group including the plurality of cells and cell-independent information for each of the plurality of cells;
• generating a first Positioning Reference Signal (PRS) sequence based on the cell group identifier;
• detecting second PRS sequences transmitted from the plurality of cells,
• wherein the first PRS sequence and the second PRS sequences are based on a same sequence with different cyclic shift values;
• and
• reporting, to the location server, Reference Signal Timing Difference (RSTD) information based on the first PRS sequence, the second PRS sequences and the cell-independent information.

A user equipment (UE) configured to report a Reference Signal Timing Difference (RSTD) value in a wireless communication system, the UE comprising:

• at least one transceiver;
• at least one processor;
• and
• at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations comprising:
• transmitting, via the at least one transceiver, a random access preamble related to a Synchronization Signal/Physical Broadcast Channel Block (SS/PBCH) block received from a specific cell included in a plurality of cells;
• establishing an RRC connection to the specific cell by requesting a Radio Resource Control (RRC) connection based on a Random Access Response (RAR) received from the specific cell;
• receiving, via the at least one transceiver from a location server, a cell group identifier for a cell group including the plurality of the cells and cell-independent information for each of the plurality of cells;
• generating a first Positioning Reference Signal (PRS) sequence based on the cell group identifier;
• detecting second PRS sequences transmitted from the plurality of cells,
• wherein the first PRS sequence and the second PRS sequences are based on a same sequence with different cyclic shift values;
• and
• reporting, to the location server, Reference Signal Timing Difference (RSTD) information based on the first PRS sequence, the second PRS sequences and the cell-independent information.

A method of receiving a Reference Signal Timing Difference (RSTD) value by a base station (BS) in a wireless communication system, the method comprising:

• transmitting a Synchronization Signal/Physical Broadcast Channel Block (SS/PBCH) block on a cell;
• receiving a random access preamble related to the SS/PBCH block;
• transmitting a Random Access Response (RAR) in response to the random access preamble;
• performing a Radio Resource Control (RRC) connection to a user equipment (UE) based on the RAR;
• generating a second PRS sequence for the cell based on a cell group identifier for a cell group including the cell;
• transmitting, to the UE, the second PRS sequence on the cell;
• and
• receiving, from the UE, the RSTD information,
• wherein the RSTD information is based on a first PRS sequence, the second PRS sequence and the cell-independent information, and
• wherein the first PRS sequence and the second PRS sequences are based on a same sequence with different cyclic shift values.

A base station (BS) configured to receive a Reference Signal Timing Difference (RSTD) value in a wireless communication system, the BS comprising:

• at least one transceiver;
• at least one processor;
• and
• at least one computer memory operably connectable to the at least one processor and storing instructions that, when executed by the at least one processor, perform operations comprising:
• transmitting a Synchronization Signal/Physical Broadcast Channel Block (SS/PBCH) block transmitted on a cell;
• receiving a random access preamble related to the SS/PBCH block;
• transmitting, via the at least one transceiver, a Random Access Response (RAR) in response to the random access preamble;
• performing a Radio Resource Control (RRC) connection to a user equipment (UE) based on the RAR;
• generating a second PRS sequence for the cell based on a cell group identifier for a cell group including the cell;
• transmitting, via the at least one transceiver to the UE, the second PRS sequence on the cell;
• and
• receiving, from the UE, the RSTD information,
• wherein the RSTD information is based on a first PRS sequence, the second PRS sequence and the cell-independent information, and
• wherein the first PRS sequence and the second PRS sequences are based on a same sequence with different cyclic shift values.