SYNCHRONIZATION SIGNAL TRANSMISSION METHOD FOR D2D COMMUNICATION IN WIRELESS COMMUNICATION SYSTEM, AND DEVICE THEREFOR

• US 20170237515A1
• Filed: 08/13/2015
• Published: 08/17/2017
• Est. Priority Date: 08/13/2014
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: LEE, Seungmin, SEO, Hanbyul
• Granted Patent: US 10,536,234 B2
• Time in Patent Office: Days
• CPC Class Codes: H04J 11/00 Orthogonal multiplex systems, e.g. using WALSH codesH04J13/00 takes precedence
• CPC Class Codes: H04J 11/0073 Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group
• CPC Class Codes: H04J 11/0086 Search parameters, e.g. search strategy, accumulation length, range of search, thresholds code acquisition in DSSS H04B1/7075
• CPC Class Codes: H04J 2211/006 Single carrier frequency division multiple access [SC FDMA]
• CPC Class Codes: H04W 56/00 Synchronisation arrangements
• CPC Class Codes: H04W 56/0015 one node acting as a reference for the others
• CPC Class Codes: H04W 76/14 Direct-mode setup

Abstract

The present invention relates to a method and a device for transmitting a device-to-device (D2D) synchronization signal of a first terminal in a wireless communication system. More specifically, the method comprises the steps of: setting at least one candidate value for a D2D synchronization signal period; and determining a D2D synchronization signal period for transmitting/receiving a D2D signal to/from a second terminal from among the at least one candidate value.

Claims

1. A method for transmitting a device-to-device (D2D) synchronization signal by a first user equipment (UE) in a wireless communication system, the method comprising:

configuring at least one candidate value for a D2D synchronization signal period; and

determining the D2D synchronization signal period for transmitting and receiving D2D signals to and from a second UE from among the at least one candidate value.

2. The method of claim 1, wherein the at least one candidate value comprises 40 ms.

3. The method of claim 2, wherein the at least one candidate value comprises a period candidate value associated with at least one of a scheduling assignment channel, a D2D data channel, and a discovery channel

4. The method of claim 1, further comprising performing D2D communication,

wherein when the D2D communication is performed, the D2D synchronization signal period is determined as a minimum value among the at least one candidate value.

5. The method of claim 1, further comprising transmitting a D2D synchronization channel,

wherein only when the D2D synchronization signal period is determined as a minimum value among the at least one candidate value, the D2D synchronization channel is configured to be transmitted to the second UE.

6. The method of claim 1, wherein when the D2D synchronization signal period is determined as a minimum value among the at least one candidate value, the D2D synchronization signal period is configured to include a plurality of D2D synchronization signal resources.

7. A first user equipment (UE) for transmitting a device-to-device (D2D) synchronization signal in a wireless communication system, the first UE comprising:

a radio frequency (RF) unit; and

a processor,

wherein the processor is configured to configure at least one candidate value for a D2D synchronization signal period and determine the D2D synchronization signal period for transmitting and receiving D2D signals to and from a second UE from among the at least one candidate value.

8. The first UE of claim 7, wherein the at least one candidate value comprises 40 ms.

9. The first UE of claim 8, wherein the at least one candidate value comprises a period candidate value associated with at least one of a scheduling assignment channel, a D2D data channel, and a discovery channel

10. The first UE of claim 7, wherein the processor is further configured to perform D2D communication and wherein when the D2D communication is performed, the D2D synchronization signal period is determined as a minimum value among the at least one candidate value.

11. The first UE of claim 7, wherein the processor is further configured to transmit a D2D synchronization channel and wherein only when the D2D synchronization signal period is determined as a minimum value among the at least one candidate value, the D2D synchronization channel is configured to be transmitted to the second UE.

12. The first UE of claim 7, wherein when the D2D synchronization signal period is determined as a minimum value among the at least one candidate value, the D2D synchronization signal period is configured to include a plurality of D2D synchronization signal resources.