# US 9,438,387 B2 · Method and apparatus for transmitting synchronization signal in wireless communication system

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- Number: US 9,438,387 B2
- Document ID: US9438387B2
- Status: Granted
- Kind: B2
- Application number: 14/234,600
- Filed: 2012-07-27
- Published: 2014-06-26
- Granted: 2016-09-06
- Earliest claimed: 2011-07-27
- Assignees: LG Electronics Inc.
- Applicants: Jin Young Chun; Ki Tae Kim; Su Nam Kim; Ji Won Kang; Bin Chul Ihm; Sung Ho Park
- Inventors: Jin Young Chun; Ki Tae Kim; Su Nam Kim; Ji Won Kang; Bin Chul Ihm; Sung Ho Park
- Web page: https://patentgrep.com/patent/US9438387B2

## CPC

- H04L 5/0007: {the frequencies being orthogonal, e.g. OFDM(A) or DMT}
- 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}
- H04J 11/0079: {Acquisition of downlink reference signals, e.g. detection of cell-ID}
- H04L 5/0032: {Distributed allocation, i.e. involving a plurality of allocating devices, each making partial allocation}
- H04W 56/00: Synchronisation arrangements
- H04W 56/001: {Synchronization between nodes}
- H04W 56/0015: {one node acting as a reference for the others}
- H04W 88/085: {Access point devices with remote components}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- 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)
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

A method and an apparatus for transmitting a synchronization signal in a wireless communication system are provided. A base station transmits a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) to a terminal through a macro node, and transmits a third synchronization signal (TSS) to the terminal through at least one radio remote head (RHH) having a cell identity (ID) that is identical to the macro node. The terminal performs synchronization based on at least one of the PSS, the SSS, and the TSS.

## Claims

### Claim 1

A method for performing, by a user equipment, synchronization in a wireless communication system, the method comprising:
receiving, from a base station, a primary synchronization signal (PSS) and a secondary synchronization signal (SSS) through a macro node;
receiving, from the base station, a third synchronization signal (TSS) through at least one radio remote head (RRH) having a cell identity (ID) that is identical to a cell ID of the macro node;
performing time synchronization with the macro node based on the PSS and the SSS;
performing time synchronization with the at least one RRH based on the TSS;
reporting, to the base station, first information on the time synchronization with the macro node and the time synchronization with the at least one RRH;
receiving, from the base station as a response to the first information, second information on a delay between a last symbol of a control channel transmitted by the base station through the macro node and an initial symbol of a data channel transmitted by the base station through the at least one RRH; and
decoding the control channel and the data channel based on the second information.

### Claim 2 (depends on 1)

The method of claim 1,
wherein the time synchronization with the macro node is different from the time synchronization with the at least one RRH.

### Claim 3 (depends on 1)

The method of claim 1, wherein information on a location in a subframe in which the TSS is transmitted, information on a period of the transmission of the TSS, or information on a sequence of the TSS is predetermined.

### Claim 4 (depends on 1)

The method of claim 1, further comprising:
receiving information on a location in a subframe in which the TSS is transmitted, information on a period of the transmission of the TSS, or information on a sequence of the TSS from the base station through a higher layer.

### Claim 5 (depends on 1)

The method of claim 1, wherein a sequence of the TSS is a part of a sequence of the SSS.

### Claim 6 (depends on 1)

The method of claim 1, further comprising:
receiving, from the base station, information on whether the TSS is transmitted or not.

### Claim 7 (depends on 1)

The method of claim 1, further comprising:
receiving an ID of the TSS from the base station.