公开(公告)号：BRPI0706360A2

公开(公告)日：2011-03-22

申请号：BRPI0706360

申请日：2007-05-25

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： CHANG KAP-SEOK ,  KIM IL-GYU ,  KIM NAM-IL ,  KIM YOUNG-HOON ,  BANG SEUNG-CHAN

IPC: H04L27/26

Abstract: The invention provides a method of generating a downlink signal and searching a cell on the basis of the downlink signal in an OFDM-based cellular system. The downlink signal includes a plurality of synchronization blocks each having a plurality of sub-frames, and a synchronization pattern composed of a combination of a cell group identification code for identifying a cell group and a frame synchronization identification code for indicating a frame start point is generated in each of the synchronization blocks. Different frame synchronization identification codes are allocated to the synchronization blocks.

公开(公告)号：CA2642017A1

公开(公告)日：2008-01-31

申请号：CA2642017

申请日：2007-07-25

Applicant: KOREA ELECTRONICS TELECOMM

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

IPC: H04L7/10

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：CA2642017C

公开(公告)日：2012-09-18

申请号：CA2642017

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

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：BRPI0706535A2

公开(公告)日：2011-03-29

申请号：BRPI0706535

申请日：2007-05-30

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： CHANG KAP-SEOK ,  KIM IL-GYU ,  KIM NAM-IL ,  PARK HYEONG-GEUN ,  KIM YOUNG-HOON ,  BANG SEUNG-CHAN

IPC: H04B7/26

Abstract: An apparatus for generating a downlink signal and a cell search apparatus are disclosed. An apparatus for generating a downlink signal generates a downlink signal by one unique cell identification code group and a plurality of frame synchronization identification sequences, generates a downlink signal by a plurality of unique cell identification code groups and a plurality of frame synchronization identification sequences, or generates a downlink signal by a plurality of unique cell identification code groups and one frame synchronization identification sequence. A cell search apparatus obtains frame synchronization and identifies cells through a frame synchronization identification sequence and a unique cell identification code group.

公开(公告)号：GB2370725B

公开(公告)日：2004-08-11

申请号：GB0111897

申请日：2001-05-16

Applicant: KOREA ELECTRONICS TELECOMM

Inventor： KIM IL-GYU ,  JEONG JAE-WOOK ,  BANG SEUNG-CHAN

IPC: H04B1/7113 ,  H04Q7/38

Abstract: There is disclosed an optimal search method of DS-CDMA signals consisted of time-multiplexed pilot symbols and control symbols capable of maximizing the performance of a receiver when the signal is searched or SNR is measured and apparatus thereof. Further, the present invention proposes a method of maximizing the performance of a searcher using basically both energy of the pilot symbol and the control symbol wherein coherent integral lengths for two regions are differentiated when the receiver searches the signals, and different weights are given to the two regions when a coherent correlation value is finally non-coherently added, and a method of effectively estimating SNR.

公开(公告)号：EP2156598A4

公开(公告)日：2014-07-02

申请号：EP08766322

申请日：2008-06-13

Applicant: KOREA ELECTRONICS TELECOMM ,  SAMSUNG ELECTRONICS CO LTD

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

IPC: H04L1/16 ,  H04B7/04 ,  H04L1/18 ,  H04L5/00

CPC classification number: H04W72/044 ,  H04B7/0417 ,  H04B7/0452 ,  H04B7/061 ,  H04B7/0623 ,  H04L1/1692 ,  H04L1/1812 ,  H04L1/1861 ,  H04L5/0016 ,  H04L5/0023 ,  H04L5/0055 ,  H04L27/18

Abstract: Provided is a method of efficiently transmitting an acknowledgement/negative acknowledgement (ACK/NACK) bit supporting hybrid automatic repeat request (HARQ) in a wireless communication system supporting multi-user multi-input and multi-output (MIMO). The method transmits the same downlink code and in-phase/quadrature (I/Q) multiplexed ACK/NACK bit to two mobile stations using the same uplink resource block. Accordingly, the method can efficiently transmit the ACK/NACK bit for multi-user MIMO and efficiently use downlink radio resources.

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：EP2186293A4

公开(公告)日：2012-05-23

申请号：EP08793159

申请日：2008-08-08

Applicant: KOREA ELECTRONICS TELECOMM ,  SAMSUNG ELECTRONICS CO LTD

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

IPC: H04L1/16 ,  H04J11/00 ,  H04L5/00

CPC classification number: H04J11/003 ,  H04L1/1861 ,  H04L5/0007 ,  H04L5/0053 ,  H04L27/2607 ,  H04W72/00

公开(公告)号：EP2008419A4

公开(公告)日：2014-06-11

申请号：EP07746073

申请日：2007-04-19

Applicant: KOREA ELECTRONICS TELECOMM ,  SAMSUNG ELECTRONICS CO LTD

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

IPC: H04L27/26 ,  H04L1/18 ,  H04W52/42

CPC classification number: H04B7/0602 ,  H04B7/12 ,  H04L1/0006 ,  H04L1/06 ,  H04L1/1893 ,  H04L5/0053 ,  H04L5/023 ,  H04L27/2626 ,  H04W52/10 ,  H04W52/146 ,  H04W52/286 ,  H04W52/48

Abstract: A transmission method performed by a mobile station for random access channel (RACH) burst transmission diversity gain is provided. According to the method, a variety of combinations of a time switching transmit diversity (TSTD) technique, a frequency hopping technique, and a power ramping technique that are robust against fading channel environments are applied to transmission of an RACH burst, thereby increasing the probability of detecting an RACH signature of a base station. Also, by using the transmission parameters (subband frequencies, transmission antennas, power, etc.) which are used for successful transmission of an RACH burst, for transmission of a successive user packet data, reliable transmission of the successive user packet data can be performed.

公开(公告)号：EP2008418A4

公开(公告)日：2013-09-04

申请号：EP07746067

申请日：2007-04-19

Applicant: KOREA ELECTRONICS TELECOMM

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

IPC: H04B7/06 ,  H04W74/08

CPC classification number: H04W52/42 ,  H04B7/0617 ,  H04B7/0623 ,  H04B7/0689 ,  H04B7/12 ,  H04L1/0001 ,  H04L1/0006 ,  H04L1/06 ,  H04L1/1867 ,  H04L1/188 ,  H04L1/1893 ,  H04L5/0053 ,  H04L5/023 ,  H04L27/2626 ,  H04W52/286 ,  H04W52/48 ,  H04W74/085 ,  H04W74/0866

Abstract: A transmission method performed by a mobile station for random access channel (RACH) burst transmission diversity gain is provided. According to the method, by combining and using switching diversity by beam forming, frequency hopping, and power ramping, the probability that when the speed of a mobile station is low, the mobile station falls into a deep fading environment is lowered, thereby increasing the probability of detecting an RACH signature of the base station. Also, by using the transmission parameters (subbands, precoding matrixes, power, etc.) which are used for successful transmission of an RACH burst, for transmission of a successive user packet data, reliable transmission of the successive user packet data can be performed.