Method for performing ranging related operation in wireless communication system
One embodiment of the present invention relates to a method by which a user equipment (UE) performs ranging in a wireless communication system, comprising the steps of: transmitting a D2D signal in a subframe N by a first UE; receiving the D2D signal in a subframe N+K from a second UE, which has set, as a subframe boundary, a time point at which the D2D signal is received; and measuring, by the first UE, a round trip time (RTT) by detecting a reception time point of the D2D signal transmitted by the second UE.
1. A method of performing ranging, which is performed by a first user equipment (UE) in a wireless communication system, comprising:
transmitting a D2D discovery signal in a subframe N by the first UE;
receiving a D2D signal in a subframe N+K from a second UE; and
measuring RTT (round trip time), by the first UE, by detecting timing at which the D2D signal transmitted by the second UE is received,
wherein the subframe N+K in which the D2D signal is received has a subframe boundary configured based on a reception timing at the second UE of the D2D discovery signal; and
wherein the K corresponds to a value configured by a network and wherein if the subframe N+K is not a D2D subframe, the K corresponds to a D2D subframe closest to the subframe N+K.
2. The method of claim 1 , wherein the RTT is obtained by dividing a difference between the timing at which the D2D signal transmitted by the second UE is received and a start point of the subframe N+K subframe by electromagnetic wave speed.
3. The method of claim 1 , wherein at least one of the N and the K is configured by a network.
4. The method of claim 1 , wherein the D2D signal transmitted by the second UE comprises location information of the first UE.
5. The method of claim 4 , wherein the location information of the first UE comprises at least one selected from the group consisting of latitude, longitude, and height.
6. A user equipment (UE) for performing ranging in a
wireless communication system, comprising:
a transmitter and a receiver; and
a processor coupled to the transmitter and receiver, wherein the processor is configured to;
transmit a D2D discovery signal in a subframe N,
receive a D2D signal in a subframe N+K from a second UE,
measure RTT (round trip time) by detecting timing at which the D2D signal transmitted by the second UE is received,
wherein the subframe N+K in which the D2D signal is received has a subframe boundary configured based on a reception timing at the second UE of the D2D discovery signal; and
wherein the K corresponds to a value configured by a network and wherein if the subframe N+K is not a D2D subframe, the K corresponds to a D2D subframe closest to the subframe N+K.
7. The UE of claim 6 , wherein the RTT is obtained by dividing a difference between the timing at which the D2D signal transmitted by the second UE is received and a start point of the subframe N+K subframe by electromagnetic wave speed.
8. The UE of claim 6 , wherein at least one of the N and the K is configured by a network.
9. The UE of claim 6 , wherein the D2D signal transmitted by the second UE comprises location information of the first UE.
10. The UE of claim 9 , wherein the location information of the first UE comprises at least one selected from the group consisting of latitude, longitude, and height.