Method for synchronization signal transmission in wireless communication system

• US 10,455,528 B2
• Filed: 09/25/2015
• Issued: 10/22/2019
• Est. Priority Date: 09/25/2014
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seo, Inkwon, Seo, Hanbyul, Kim, Youngtae
• Primary Examiner(s): Mills, Donald L
• Application Number:
  US15/510,159
• Publication Number:
  US 20170303216A1
• Time in Patent Office: 1,488 Days
• Field of Search: None
• CPC Class Codes: H04J 11/00 Orthogonal multiplex systems, e.g. using WALSH codesH04J13/00 takes precedence
• CPC Class Codes: H04J 11/0059 Out-of-cell user aspects
• 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 11/0076 Acquisition of secondary synchronisation channel, e.g. detection of cell-ID group
• CPC Class Codes: H04W 52/383 power control in peer-to-peer links
• 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 8/005 Discovery of network devices, e.g. terminals
• CPC Class Codes: H04W 84/18 Self-organising networks, e.g. ad-hoc networks or sensor networks
• CPC Class Codes: H04W 92/18 between terminal devices

Abstract

An embodiment of the present invention relates to a method for transmitting a synchronization signal in a wireless communication system, the method comprising the steps of: generating a synchronization signal on the basis of a cell ID which is determined depending on whether a terminal for transmitting the synchronization signal is a terminal located outside of a coverage; and transmitting the synchronization signal.

Claims

1. A method of receiving a device-to-device (D2D) synchronization signal (SS) in a wireless communication system, the method comprising:

receiving from a second D2D user equipment (UE), by a first D2D UE, a primary D2D SS including ID information, the ID information informing whether the second D2D UE is an in-coverage UE or an out-of-coverage UE; and

receiving, by the first D2D UE, a secondary D2D SS based on the primary D2D SS,

wherein the primary D2D SS is transmitted on a same subframe as the secondary D2D SS and a Physical Sidelink Broadcast Channel (PSBCH), and

wherein a transient period is included in a transmission region of the secondary D2D SS.

2. The method according to claim 1, wherein,

the ID information includes a value that is less than a predetermined value in a first state that the second D2D UE is the in-coverage UE, and

the ID information includes a value that is greater than a predetermined value in a second state that the second D2D UE is the out-of-coverage UE.

3. The method according to claim 1, wherein transmit power of the PSBCH and transmit power of the secondary D2D SS have different values.

4. The method according to claim 1, wherein the transient period included in the transmission region of the secondary D2D SS is between the PSBCH and the secondary D2D SS.

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

a transmitter;

a receiver; and

a processor,

wherein the processor is configured to control the receiver to;

receive, from a second D2D UE, a primary D2D SS including ID information, the ID information informing whether the second D2D UE is an in-coverage UE or an out-of-coverage UE, and

receive a secondary D2D SS based on the primary D2D SS,

wherein the primary D2D SS is transmitted on a same subframe as the secondary D2D SS and a Physical Sidelink Broadcast Channel (PSBCH), and

wherein a transient period is included in a transmission region of the secondary D2D SS.

6. The first D2D UE according to claim 5, wherein,

the ID information includes a value that is less than a predetermined value in a first state that the second D2D UE is the is an in-coverage UE, and

the ID information includes a value that is greater than a predetermined value in a second state that the UE is the out-of-coverage UE.

7. The first D2D UE according to claim 5, wherein transmit power of the PSBCH and transmit power of the secondary D2D SS have different values.