公开(公告)号：EP2044720A4

公开(公告)日：2010-09-01

申请号：EP07793239

申请日：2007-07-25

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： KIM IL-GYU ,  PARK HYEONG-GEUN ,  KO YOUNG-JO ,  CHANG KAPSEOK ,  YI HYOSEOK ,  KIM YOUNG-HOON ,  BANG SEUNG-CHAN

IPC: H04L7/10

CPC classification number: H04W56/001 ,  H04J11/0069 ,  H04J11/0093 ,  H04L5/0037 ,  H04L5/005 ,  H04L5/0053 ,  H04L27/2613 ,  H04L27/2655 ,  H04L27/2675 ,  H04W36/0061 ,  H04W36/08 ,  H04W56/00

Abstract: In a cellular system in which OFDM is used, a forward link synchronization channel, a common pilot channel structure, an initial cell searching method of a mobile station, and an adjacent cell searching method for handover are required. A method of transmitting a forward synchronization signal in a wireless communication system according to the present invention includes generating a frame comprised of a plurality of sync blocks; and transmitting the frame through a forward link, wherein the frame comprises primary synchronization channel sequences which provide timing information of the sync blocks and a plurality of secondary synchronization channel sequences which provide timing information of the frame, wherein a cell identifier is specified by a combination of the primary synchronization channel sequence and a hopping code word specified by the plurality of the secondary synchronization channel sequences Therefore, the cell searching time can be efficiently reduced in an OFDM system.

公开(公告)号：EP2160858A4

公开(公告)日：2012-06-27

申请号：EP08766532

申请日：2008-06-23

Applicant: KOREA ELECTRONICS TELECOMM ,  KT CORP

Inventor： KO YOUNG-JO ,  PARK HYEONG-GEUN ,  KIM IL-GYU ,  CHANG KAPSEOK ,  YI HYOSEOK ,  KIM YOUNG-HOON ,  BANG SEUNG-CHAN

IPC: H04L1/00 ,  H04J13/18 ,  H04L5/00 ,  H04L23/02

CPC classification number: H04W72/0406 ,  H04J13/0048 ,  H04J13/0062 ,  H04J13/18 ,  H04L1/0026 ,  H04L1/003 ,  H04L1/0031 ,  H04L1/1607 ,  H04L1/1692 ,  H04L1/1861 ,  H04L5/0017 ,  H04L23/02 ,  H04W72/0466

Abstract: When a plurality of terminals share the same resources in a wireless communication system, and when control information such as acknowledgement/negative acknowledgement (ACK/NAK) information or scheduling information is transmitted, a method of efficiently performing code division multiplexing (CDM) is required to distinguish the plurality of terminals. In particular, it is necessary to develop a method by which a code sequence of CDM can be selected and used according to each cell condition. Provided is a method of forming a signal in a wireless communication system in which a plurality of terminals commonly share frequency and time resources. The method includes the operations of receiving condition information in a cell; selecting one of a plurality of time domain orthogonal sequences having different lengths, according to the condition information; and allocating the selected time domain orthogonal sequence to a control signal symbol block.

公开(公告)号：EP2076980A4

公开(公告)日：2012-06-06

申请号：EP07833422

申请日：2007-10-18

Applicant: KOREA ELECTRONICS TELECOMM ,  SAMSUNG ELECTRONICS CO LTD

Inventor： KIM IL-GYU ,  PARK HYEONG-GEUN ,  KO YOUNG-JO ,  CHANG KAPSEOK ,  YI HYOSEOK ,  LEE JUN-HWAN ,  KIM YOUNG-HOON ,  BANG SEUNG-CHAN

IPC: H04J11/00

CPC classification number: H04J11/0069 ,  H04L5/0007 ,  H04L5/0023 ,  H04L5/0048 ,  H04L25/0204 ,  H04L25/0226 ,  H04L25/0228 ,  H04L25/03866 ,  H04L27/261 ,  H04L27/2613 ,  H04L27/2656 ,  H04L27/2657 ,  H04L27/2675 ,  H04W56/0085 ,  Y02D70/1262

Abstract: Provided are a sync channel of a forward link, a common pilot channel structure, and an initial cell search method and an adjacent cell search method for handover in a cellular system using orthogonal frequency division multiplexing (OFDM). A cell search method in an OFDM cellular system in which a primary sync channel and a secondary sync channel are configured based on time division multiplexing (TDM) includes acquiring sync block synchronization and a primary sync channel sequence number using a primary sync channel symbol included in a frame received by a terminal, detecting a boundary of the frame and a scrambling code group using the sync block and a secondary sync channel symbol included in the frame received by the terminal, and acquiring a scrambling code using the primary sync channel sequence number and the scrambling code group, thereby reducing cell search time with low complexity.