Method and apparatus for measuring position of terminal in wireless communication system
A method by which a terminal operates in a wireless communication system, according to one embodiment, comprises the steps of: receiving time difference of arrival (TDoA) slots from anchor nodes (ANs); and measuring the position of the terminal by using the TDoA slots, wherein the TDoA slots include control information of the ANs and positioning reference signals (PRSs) of the ANs.
1. A method by a user equipment (UE), the method comprising:
transmitting first control information including a first request for PRS transmission to a peer UE in a first time slot;
receiving second control information from the peer UE in a second time slot in response to the transmitted first control information;
receiving a first positioning reference signal (PRS) from the peer UE in the second time slot based on the second control information; and
performing time difference of arrival (TDoA) measurements based on the first PRS,
wherein the second control information includes information regarding the peer UE and information regarding the first PRS.
2. The method according to claim 1 , wherein:
the second control information includes a second request for PRS transmission, and the method comprises:
transmitting third control information and a second PRS in a third time slot based on the second request for PRS transmission.
3. The method according to claim 2 , wherein:
the second control information includes a minimum positioning quality indicator (PQI) required for local based service (LBS),
wherein the third control information and the second PRS are transmitted based on a PQI of the UE being equal to or higher than the minimum PQI, and
wherein the PQI of the UE represents reliability of positioning information of the UE.
4. The method according to claim 2 , further comprising:
sensing and reserving resources in the third time slot, wherein the third control information and the second PRS are transmitted through the reserved resources.
5. The method according to claim 1 , wherein:
the second time slot further includes at least an auto-gain control (ACG) symbol or a guard symbol.
6. A user equipment (UE) comprising:
at least one processor; and
at least one computer memory operatively connected to the at least one processor, and configured to store instructions that cause the at least one processor to perform operations comprising
transmitting first control information including a first request for PRS transmission to a peer UE in a first time slot;
receiving second control information from the peer UE in a second time slot in response to the transmitted first control information;
receiving a first positioning reference signal (PRS) from the peer UE in the second time slot based on the second control information; and
performing time difference of arrival (TDoA) measurements based on the first PRS,
wherein the second control information includes information regarding the peer UE and information regarding the first PRS.
7. A method by a user equipment (UE), the method comprising:
receiving first control information including a first request for PRS transmission from a peer UE in a first time slot; and
transmitting second control information and a first positioning reference signal (PRS) to the peer UE in a second time slot, based on the first control information, and
wherein the second control information includes information regarding the UE and information regarding the first PRS.