Method for discovering device in wireless communication system supporting device-to-device communication and apparatus for same

Patent metadata

Field	Value
Publication number	US-10182335-B2
Application number	US-201515123586-A
Country	US
Kind code	B2
Filing date	Mar 4, 2015
Priority date	Mar 4, 2014
Publication date	Jan 15, 2019
Grant date	Jan 15, 2019

Abstract

Disclosed are a terminal discovery method in a wireless communication system supporting device-to-device (D2D) communication, and a device therefor. The method for discovering a terminal in a wireless communication system supporting device-to-device (D2D) communication, includes transmitting, by a terminal, a discovery signal, and receiving, by the terminal, a response signal as a response with respect to the discovery signal from a different terminal, wherein the response signal is transmitted by the different terminal when a response delay time determined on the basis of a reception signal-to-interference noise ratio (SINR) terminates.

First claim

The invention claimed is:

1. A method for discovering a different terminal in a wireless communication system supporting device-to-device (D2D) communication, the method comprising:
transmitting, by a terminal, a discovery signal for detecting neighboring terminals for the D2D communication;
receiving, by the terminal, a response signal as a response with respect to the discovery signal from the different terminal,
wherein the response signal is transmitted by the different terminal when a response delay time determined on the basis of a reception signal-to-interference noise ratio (SINR) terminates;
detecting the different terminal based on the received response signal;
selecting, by the terminal, a specific terminal for performing a terminal discovery process at a next discovery period, from among terminals which have transmitted the response signal; and
transmitting, by the terminal, information of a resource pool for transmission of a discovery message by the selected specific terminal at the next discovery period to the selected specific terminal.

2. The method of claim 1 , wherein the response delay time is determined to be in inverse proportion to the reception SINR.

3. The method of claim 1 , wherein the specific terminal for performing the terminal discovery process at the next discovery period is selected as a terminal which has first transmitted the response signal.

4. The method of claim 1 , wherein the specific terminal for performing the terminal discovery process at the next discovery period is selected as a terminal which has transmitted the response signal the latest.

5. The method of claim 1 , wherein the specific terminal for performing the terminal discovery process at the next discovery period is selected randomly.

6. The method of claim 1 , wherein the discovery signal includes a terminal identifier and/or discovery period information.

7. The method of claim 1 , further comprising: after transmitting the discovery signal, switching the terminal to a reception mode.

8. The method of claim 1 , wherein the terminal transmits the discovery signal only once during a discovery period and maintains a reception mode to receive a response signal transmitted from the neighboring terminals for a remaining time of the discovery period.

9. The method of claim 1 , wherein the specific terminal is a terminal having a shortest response delay time or a longest response delay time.

10. A method for discovering a terminal in a wireless communication system supporting device-to-device (D2D) communication, the method comprising:
receiving, by the terminal, a discovery signal for detecting neighboring terminals for the D2D communication from a neighboring terminal;
determining, by the terminal, a response delay time on the basis of a reception signal-to-interference noise ratio (SINR);
transmitting, by the terminal, a response signal as a response with respect to the discovery signal when the response delay time terminates,
wherein the terminal is detected by the neighboring terminal based on the response signal; and
receiving information of a resource pool for transmitting, by the terminal, a discovery message at a next discovery period from the neighboring terminal, if the terminal is selected by the neighboring terminal to perform a terminal discovery process at the next discovery period.

11. The method of claim 10 , wherein the response delay time is determined to be in inverse proportion to the reception SINR.

12. The method of claim 10 , wherein the reception SINR is derived on the basis of the discovery signal or a reference signal transmitted from the terminal which has transmitted the discovery signal.

Assignees

• Lg Electronics Inc
• Industry Univ Cooperation Foundation Of Soongsil Univ

Inventors

• Kim Hakseong
• Yang Mochan
• Wu Shanai
• Shin Yoan

Classifications

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title

• H04W48/16

  Discovering, processing access restriction or access information · CPC title

• H04W8/005 Primary

  Discovery of network devices, e.g. terminals · CPC title

• H04W92/18

  between terminal devices · CPC title

• H04B17/346

  Noise values (signal-to-interference ratio [SIR] or carrier-to-interference ratio [CIR] H04B17/336) · CPC title