# US 10,455,528 B2 · Method for synchronization signal transmission in wireless communication system

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- Number: US 10,455,528 B2
- Document ID: US10455528B2
- Status: Granted
- Kind: B2
- Application number: 15/510,159
- Filed: 2015-09-25
- Published: 2017-10-19
- Granted: 2019-10-22
- Earliest claimed: 2014-09-25
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Inkwon Seo; Hanbyul Seo; Youngtae Kim
- Web page: https://patentgrep.com/patent/US10455528B2

## CPC

- H04W 52/383: {power control in peer-to-peer links}
- H04W 56/0015: {one node acting as a reference for the others}
- H04J 11/00: Orthogonal multiplex systems, {e.g. using WALSH codes}(H04J13/00 takes precedence)
- H04J 11/0059: {Out-of-cell user aspects}
- H04J 11/0073: {Acquisition of primary synchronisation channel, e.g. detection of cell-ID within cell-ID group}
- H04J 11/0076: {Acquisition of secondary synchronisation channel, e.g. detection of cell-ID group}
- H04W 56/00: Synchronisation arrangements
- H04W 8/005: {Discovery of network devices, e.g. terminals}
- H04W 84/18: Self-organising networks, e.g. ad-hoc networks or sensor networks
- H04W 92/18: between terminal devices
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)
- H04J: MULTIPLEX COMMUNICATION (transmission in general H04B; peculiar to transmission of digital information H04L5/00; systems for the simultaneous or sequential transmission of more than one television signal H04N7/08; in exchanges H04Q11/00; stereophonic systems H04S)

## 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

### Claim 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.

### Claim 2 (depends on 1)

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.

### Claim 3 (depends on 1)

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

### Claim 4 (depends on 1)

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.

### Claim 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.

### Claim 6 (depends on 5)

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.

### Claim 7 (depends on 5)

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.