Method of searching code sequence in mobile communication system

• US 8,483,036 B2
• Filed: 02/26/2007
• Issued: 07/09/2013
• 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, Kwon, Yeong Hyeon
• Primary Examiner(s): Faroul, Farah
• Application Number:
  US12/280,540
• Publication Number:
  US 20090170508A1
• Time in Patent Office: 2,325 Days
• Field of Search: 370/202, 370/204, 370/208, 370/210, 370/335, 455/434
• US Class Current: 370/202
• 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

The present invention relates to a method of searching a code sequence in a cell based mobile communication system, by which a receiving side is able to code sequence detection efficiently. In a code sequence transmitting method for an efficient code sequence search in a mobile communication system, the code sequence transmitting method includes a step of boosting at least one tone for a code sequence and a step of transmitting the code sequence having the boosted at least one tone to a receiving side.

Claims

1. A method for transmitting a signal for cell searching in a mobile communication system having a multi-cell environment, the method comprising:

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,

wherein 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

wherein a combination of the first index and the second index permits identification of an identity of the cell, wherein the first index includes a cell group identifier for identifying a cell group including the cell, and wherein the second index includes a cell identifier for identifying the cell included in the cell group identified by the cell group identifier, and wherein the first index is different from the second index.

2. The method of claim 1, wherein the signal is further defined by a concatenation of the first code sequence and the second code sequence at a frequency domain.

3. A method for receiving a signal for cell searching in a mobile communication system having a multi-cell environment, the method comprising:

receiving the signal from a transmitting party device, wherein 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, wherein a combination of the first index and the second index permits identification of an identity of the cell, and wherein the first index is different from the second index;

performing a synchronization based on the received signal;

finding the identity of the cell using the combination of the first code sequence and the second code sequence,

wherein the finding comprises;

obtaining a cell group identifier for identifying a cell group including at least one cell from the first index;

obtaining a cell identifier for identifying the cell included in the cell group identified by the cell group identifier using the second index; and

identifying the cell included within the cell group using the cell identifier.

4. The method of claim 3, wherein the signal is further defined by a concatenation of the first code sequence and the second code sequence at a frequency domain.