Method and device for synchronizing frame numbers between device-to-device communication supported user devices

Patent metadata

Field	Value
Publication number	US-2016192309-A1
Application number	US-201414910892-A
Country	US
Kind code	A1
Filing date	Aug 18, 2014
Priority date	Aug 8, 2013
Publication date	Jun 30, 2016
Grant date	—

Abstract

A method of synchronizing device-to-device terminals according to an embodiment of the present specification may comprise the steps of: matching timing synchronization with at least one terminal counterpart; and setting a frame number for device-to-device communication after the timing synchronization matching step.

First claim

1 . A synchronization method of a Device-to-Device (D2D) terminal comprising:
synchronizing with at least one correspondent terminal; and setting a frame number for D2D communication after synchronization.

2 . The method of claim 1 , wherein setting a frame number comprises:
setting the frame number to a preset frame number.

3 . The method of claim 1 , wherein:
synchronizing with at least one correspondent terminal comprises: receiving a synchronization signal from the at least one correspondent terminal; and setting a frame number comprises: extracting a frame number of at least one correspondent terminal from the synchronization signal; and setting the frame number for D2D communication according to the extracted frame number.

4 . The method of claim 3 , wherein the synchronization signal is received via D2D Synch channel (D2DSS) and has a specific time period.

5 . The method of claim 3 , wherein extracting a frame number comprises:
selecting one of the synchronization signals, received from a number of correspondent terminals, based on the order of priority; and extracting a frame number from the selected synchronization signal.

6 . The method of claim 5 , wherein the order of priority in the synchronization signals is determined based on at least one of the following:
An index of a sequence used for a synchronization signal, a previously stored code book and a sequence index list.

7 . The method of claim 1 , wherein setting a frame number comprises:
receiving a signal via a frame number channel; extracting one frame number of at least one correspondent terminal from the signal received via the frame number channel; and setting a frame number for D2D communication according to the extracted frame number.

8 . A synchronization apparatus of a Device-to-Device (D2D) terminal comprising:
a transceiver for transmitting/receiving signals to/from at least one correspondent terminal; and a controller for synchronizing with the at least one correspondent terminal and setting frame numbers for D2D communication, after synchronization.

9 . The apparatus of claim 8 , wherein the controller sets the frame number for D2D communication to a preset frame number.

10 . The apparatus of claim 8 , wherein:
the transceiver receives a synchronization signal from the at least one correspondent terminal; and the controller extracts a frame number of at least one correspondent terminal from the at least one synchronization signal and sets the frame number for D2D communication according to the extracted frame number.

11 . The apparatus of claim 10 , wherein the synchronization signal is received via D2D Synch channel (D2DSS) and has a specific time period.

12 . The apparatus of claim 10 , wherein the controller: selects one of the synchronization signals, received from a number of correspondent terminals, based on the order of priority; and extracts a frame number from the selected synchronization signal.

13 . The apparatus of claim 12 , wherein the order of priority in the synchronization signals is determined based on at least one of the following:
An index of a sequence used for a synchronization signal, a previously stored code book and a sequence index list.

14 . The apparatus of claim 8 , wherein:
the transceiver receives a signal via a frame number channel; and the controller extracts one frame number of at least one correspondent terminal from the signal received via the frame number channel, and sets a frame number for D2D communication according to the extracted frame number.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kim Wooseong
• Jeong Kyeongin

Classifications

• H04W84/18

  Self-organising networks, e.g. ad-hoc networks or sensor networks · CPC title

• H04W56/0015 Primary

  one node acting as a reference for the others · CPC title

• H04W56/0025

  synchronizing potentially movable access points · CPC title

• H04W4/70

  Services for machine-to-machine communication [M2M] or machine type communication [MTC] · CPC title

• H04W56/001 Primary

  Synchronization between nodes · CPC title