METHOD FOR PERFORMING RANGING RELATED OPERATION IN WIRELESS COMMUNICATION SYSTEM

• US 20180098299A1
• Filed: 04/01/2016
• Published: 04/05/2018
• Est. Priority Date: 04/01/2015
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: CHAE, Hyukjin
• Granted Patent: US 10,568,057 B2
• Time in Patent Office: Days
• CPC Class Codes: G01S 13/74 Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
• CPC Class Codes: G01S 5/0072 Transmission between mobile stations, e.g. anti-collision systems
• CPC Class Codes: H04J 11/00 Orthogonal multiplex systems, e.g. using WALSH codesH04J13/00 takes precedence
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 56/0065 using measurement of signal travel time
• CPC Class Codes: H04W 64/003 locating network equipment
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 76/14 Direct-mode setup
• CPC Class Codes: H04W 8/005 Discovery of network devices, e.g. terminals

Abstract

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.

Claims

1. A method of performing ranging, which is performed by a user equipment (UE) 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 configured the timing at which the D2D signal is received as a subframe boundary; and

measuring RTT (round trip time), by the first UE, by detecting the timing at which the D2D signal transmitted by the second UE is received.

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 N+K subframe by electromagnetic wave speed.

3. The method of claim 1, wherein the D2D signal transmitted by the first UE in the subframe N corresponds to one selected from the group consisting of a discovery signal, a D2D communication signal, and an SSS (sidelink synchronization signal).

4. The method of claim 1, wherein at least one of the N and the K is configured by a network.

5. The method of claim 1, 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.

6. The method of claim 1, wherein the D2D signal transmitted by the second UE comprises location information of the first UE.

7. The method of claim 1, wherein location information of the first UE comprises at least one selected from the group consisting of latitude, longitude, and height.

8. A user equipment (UE) performing ranging in a wireless communication, comprising:

a transmitter and a receiver; and

a processor, the processor configured to transmit a D2D signal in a subframe N, the processor configured to receive the D2D signal in a subframe N+K from a second UE, which has configured the timing at which the D2D signal is received as a subframe boundary, the processor configured to measure RTT (round trip time) by detecting the timing at which the D2D signal transmitted by the second UE is received.

9. The UE of claim 8, 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 N+K subframe by electromagnetic wave speed.

10. The UE of claim 8, wherein the D2D signal transmitted by the first UE in the subframe N corresponds to one selected from the group consisting of a discovery signal, a D2D communication signal, and an SSS (sidelink synchronization signal).

11. The UE of claim 8, wherein at least one of the N and the K is configured by a network.

12. The UE of claim 8, 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.

13. The UE of claim 8, wherein the D2D signal transmitted by the second UE comprises location information of the first UE.

14. The UE of claim 8, wherein location information of the first UE comprises at least one selected from the group consisting of latitude, longitude, and height.