Method of searching code sequence in mobile communication system

• US 9,161,295 B2
• Filed: 06/11/2013
• Issued: 10/13/2015
• Est. Priority Date: 02/24/2006
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Han, Seung Hee, Noh, Min Seok, Kwan, Yeong Hyeon
• Primary Examiner(s): Faroul, Farah
• Application Number:
  US13/915,340
• Publication Number:
  US 20130272271A1
• Time in Patent Office: 854 Days
• Field of Search: 370/203, 370/208, 370/335
• US Class Current: 1/1
• CPC Class Codes: H04J 11/0069 Cell search, i.e. determining cell identity [cell-ID] design of multiplexing codes H04J13/00; processing access restriction or access information H04W48/16; discovery of network devices for network data management H04W8/005; sounding signals for channel estimation H04L25/0226; structure of reference signals in multicarrier modulation systems H04L27/2613; frame, time or carrier synchronisation in multicarrier modulation systems H04L27/2655
• CPC Class Codes: H04J 13/0055 ZCZ [zero correlation zone]
• CPC Class Codes: H04J 13/16 Code allocation
• CPC Class Codes: H04J 3/06 Synchronising arrangements for television systems H04N5/04; bit-synchronisation H04L7/00
• CPC Class Codes: H04J 3/0605 Special codes used as synchronising signal
• CPC Class Codes: H04J 3/0611 PN codes H04J3/0608 takes precedence
• CPC Class Codes: H04L 5/0003 Two-dimensional division time-code division H04J11/00, H04J13/00; for time-space division H04B7/0413, H04B7/0697
• CPC Class Codes: H04L 5/0007 the frequencies being orthogonal, e.g. OFDM(A), DMT
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/005 of common pilots, i.e. pilots destined for multiple users or terminals
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 56/001 Synchronization between nodes
• CPC Class Codes: H04W 88/08 Access point devices

Abstract

A method for transmitting a signal for cell searching in a mobile communication system having a multi-cell environment includes transmitting the signal to one or more receiving party devices within a cell, wherein the signal is used for a synchronization of the one or more receiving party devices within the cell, the signal is defined by a combination of a first code sequence derived from a first index and a second code sequence derived from a second index, and an identity of the cell is used for defining the combination of the first code sequence and the second code sequence.

Claims

1. A method of transmitting a synchronization signal, the method comprising:

generating a first code sequence by using a first number and a second code sequence by using a second number for synchronization of UE (User Equipment) within a cell;

mapping the first code sequence to resource elements (REs) in a first orthogonal frequency-division multiplexing (OFDM) symbol and the second code sequence to REs in a second OFDM symbol; and

transmitting the mapped first code sequence and the mapped second code sequence, wherein the first OFDM symbol is ‘

n’

OFDM symbol ahead from the second OFDM symbol,

wherein the first code sequence is generated from a first number and the second code sequence is generated from a second number,

wherein a combination of the first number and the second number indicates an identity of the cell, and

wherein the first number is related to a cell group identifier for identifying a cell group including the cell and the second number is related to a cell identifier for identifying the cell included in the cell group identified by the cell group identifier.

2. The method of claim 1, wherein the ‘

n’

is 1.

3. A method of receiving a synchronization signal, the method comprising:

receiving a first code sequence and a second code sequence for synchronization of UE (User Equipment) within a cell; and

acquiring synchronization and an identity of the cell by using the first code sequence and the second code sequence,

wherein the first code sequence is mapped to resource elements (REs) in a first orthogonal frequency-division multiplexing (OFDM) symbol and the second code sequence is mapped to REs in a second OFDM symbol, and

wherein the first OFDM symbol is ‘

n’

OFDM symbol ahead from the second OFDM symbol,

wherein the first code sequence is generated from a first number and the second code sequence is generated from a second number,

wherein a combination of the first number and the second number indicates an identity of the cell, and

wherein the first number is related to a cell group identifier for identifying a cell group including the cell and the second number is related to a cell identifier for identifying the cell included in the cell group identified by the cell group identifier.

4. The method of claim 3, wherein the ‘

n’

is 1.