Method of searching code sequence in mobile communication system

• US 9,942,863 B2
• Filed: 10/06/2016
• Issued: 04/10/2018
• 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:
  US15/287,307
• Publication Number:
  US 20170026923A1
• Time in Patent Office: 551 Days
• Field of Search: None
• 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 receiving a synchronization signal, the method comprising:

receiving, by a user equipment, a first code sequence generated from a first number which is related to a cell group identifier for identifying a cell group including the cell via a first orthogonal frequency-division multiplexing (OFDM) symbol and a second code sequence generated from a second number which is related to a cell identifier for identifying the cell included in the cell group identified by the cell group identifier via a second OFDM symbol, and

acquiring an identity of the cell from a combination of the first number and the second number.

2. The method of claim 1, wherein the first OFDM symbol is ‘

n’

OFDM symbol ahead from the second OFDM symbol.

3. The method of claim 2, wherein the ‘

n’

is 1.

4. An user equipment for receiving a synchronization signal, the user equipment comprising:

receiving device;

transmitting device; and

processor,

wherein the processor is configured to receive a first code sequence generated from a first number which is related to a cell group identifier for identifying a cell group including the cell via a first orthogonal frequency-division multiplexing (OFDM) symbol and a second code sequence generated from a second number which is related to a cell identifier for identifying the cell included in the cell group identified by the cell group identifier via a second OFDM symbol, and to acquire an identity of the cell from a combination of the first number and the second number.

5. The user equipment of claim 4, wherein the first OFDM symbol is ‘

n’

OFDM symbol ahead from the second OFDM symbol.

6. The user equipment of claim 5, wherein the ‘

n’

is 1.

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

generating, by a base station, a first code sequence from a first number which is related to a cell group identifier for identifying a cell group including the cell and a second code sequence from a second number which is related to a cell identifier for identifying the cell included in the cell group identified by the cell group identifier, wherein a combination of the first number and the second number indicates an identity of the cell; and

transmitting the first code sequence via a first orthogonal frequency-division multiplexing (OFDM) symbol and the second code sequence via a second OFDM symbol.

8. The method of claim 7, wherein the first OFDM symbol is ‘

n’

OFDM symbol ahead from the second OFDM symbol.

9. The method of claim 8, wherein the ‘

n’

is 1.

10. A base station for receiving a synchronization signal, the base station comprising:

receiving device;

transmitting device; and

processor,

wherein the processor is configured to generate a first code sequence from a first number which is related to a cell group identifier for identifying a cell group including the cell and a second code sequence from a second number which is related to a cell identifier for identifying the cell included in the cell group identified by the cell group identifier, wherein a combination of the first number and the second number indicates an identity of the cell; and

to transmit the first code sequence via a first orthogonal frequency-division multiplexing (OFDM) symbol and the second code sequence via a second OFDM symbol.

11. The base station of claim 10, wherein the first OFDM symbol is ‘

n’

OFDM symbol ahead from the second OFDM symbol.

12. The base station of claim 11, wherein the ‘

n’

is 1.