中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

27 records (took 0.021 seconds)

    TRANSMISSION POWER CONTROL METHOD AND DEVICE FOR COGNITIVE RADIO DEVICE
    2.
    发明申请
    TRANSMISSION POWER CONTROL METHOD AND DEVICE FOR COGNITIVE RADIO DEVICE 审中-公开
    传输功率控制方法和认证无线电设备的设备

    公开(公告)号：WO2010126322A3

    公开(公告)日：2011-01-20

    申请号：PCT/KR2010002724

    申请日：2010-04-29

    Applicant: KOREA ELECTRONICS TELECOMM ,  HWANG SUNG-HYUN ,  KO GWANGZEEN ,  KIM CHANG-JOO ,  SONG MYUNG-SUN ,  UM JUNG-SUN ,  CHOI MIN-SHEO

    Inventor： HWANG SUNG-HYUN ,  KO GWANGZEEN ,  KIM CHANG-JOO ,  SONG MYUNG-SUN ,  UM JUNG-SUN ,  CHOI MIN-SHEO

    IPC: H04W52/00 ,  H04W52/04 ,  H04W52/34

    CPC classification number: H04W52/04

    Abstract: The present invention relates to a transmission power control method and device. The transmission power control method for a cognitive radio device according to one embodiment of the present invention includes obtaining CR environmental information about a registered user or an unregistered user occupying an adjacent channel or an adjacent cell of a cognitive radio device, determining a transmission power value of the cognitive radio device using the CR environmental information, and generating transmission power control information including a transmission power value. According to the present invention, the reliable communication of the cognitive radio device can be guaranteed and at the same time interference for a registered user can be minimized.

    Abstract translation: 发射功率控制方法和装置技术领域本发明涉及发射功率控制方法和装置。 根据本发明的一个实施例的用于认知无线电设备的发送功率控制方法包括获得关于占用认知无线电设备的相邻信道或相邻小区的注册用户或未注册用户的CR环境信息，确定发送功率值 的认知无线电设备，并且生成包括发送功率值的发送功率控制信息。 根据本发明，可以保证认知无线电设备的可靠通信，并且同时可以最小化对注册用户的干扰。

    CHANNEL SWITCHING APPARATUS AND METHOD OF A BASE STATION AND CHANNEL SWITCHING APPARATUS AND METHOD OF A TERMINAL BASED ON THE COGNITIVE RADIO SYSTEM
    3.
    发明专利
    CHANNEL SWITCHING APPARATUS AND METHOD OF A BASE STATION AND CHANNEL SWITCHING APPARATUS AND METHOD OF A TERMINAL BASED ON THE COGNITIVE RADIO SYSTEM 未知

    公开(公告)号：CA2708838C

    公开(公告)日：2016-02-02

    申请号：CA2708838

    申请日：2008-12-05

    Applicant: KOREA ELECTRONICS TELECOMM

    Inventor： KO GWANGZEEN ,  YOU SUNG-JIN ,  SONG MYUNG-SUN ,  HWANG SUNG-HYUN ,  UM JUNG-SUN ,  KIM CHANG-JOO

    IPC: H04B7/155

    Abstract: In a cognitive radio system, when communication in an operational channel is determined to be discontinued due to that an incumbent user (IU) entering the operational channel that is currently being used or due to that an excessive interference occurring in the operational channel, the operational channel is switched to a pre-arranged channel. However, since some parameters are different between the operational channel and the pre-arranged channel, an initialization procedure has to be performed to allow the cognitive radio system to be adapted to those some parameters. Since an initialization technique aiming for this situation is not developed yet, a conventional cognitive radio system uses a general initialization technique used to initially operate a system. However, the general initialization technique has to allow the system to be adapted to many parameters so that it takes a relatively long initialization time. A channel switching apparatus and method thereof of a base station, which allocates a slot for data exchange with each of a plurality of terminals in a frequency channel that is not used by the IU and thus performs communication, include transmitting a channel switching message for requesting to switch to a backup channel when a signal of the IU is sensed in the frequency channel; transmitting a beacon frame via the backup channel, wherein the beacon frame comprises allocation information about slots which are in the frequency channel and which are respectively allocated to each of the plurality of terminals; and allocating the slot for data exchange with each of the plurality of terminals to the backup channel according to the allocation information, and communicating with each of the plurality of terminals. By doing so, frequency resources between each of networks can be efficiently used, and convenience and efficiency with respect to network operation can be maximized.

    METHOD AND APPARATUS FOR FREQUENCY DIVERSITY TRANSMISSION
    5.
    发明申请
    METHOD AND APPARATUS FOR FREQUENCY DIVERSITY TRANSMISSION 审中-公开
    频率分集传输的方法与装置

    公开(公告)号：WO2009134106A3

    公开(公告)日：2010-07-15

    申请号：PCT/KR2009002330

    申请日：2009-05-01

    Applicant: KOREA ELECTRONICS TELECOMM ,  UM JUNG-SUN ,  HWANG SUNG-HYUN ,  KO GWANGZEEN ,  SONG MYUNG-SUN ,  KIM CHANG-JOO

    Inventor： UM JUNG-SUN ,  HWANG SUNG-HYUN ,  KO GWANGZEEN ,  SONG MYUNG-SUN ,  KIM CHANG-JOO

    IPC: H04J11/00

    CPC classification number: H04L5/0023 ,  H04L5/003

    Abstract: Provided are a transmitter and a receiver. The transmitter combines N data signals received from an encoded bit stream to generate N symbols; maps the N symbols to subcarriers that are spaced more than a coherent bandwidth apart; and receives and moves the N symbols, which are mapped to the subcarriers that are spaced more than a coherent bandwidth apart, to their own positions. The receiver demodulates N pieces of data using the N symbols received from the transmitter in a manner similar to that used by the transmitter.

    Abstract translation: 提供发射机和接收机。 发射机组合从编码比特流接收的N个数据信号以产生N个符号; 将N个符号映射到间隔多于相干带宽的子载波; 并且将N个符号映射到彼此间隔多于一个相干带宽的子载波并移动到它们自己的位置。 接收机以与发射机使用的方式类似的方式使用从发射机接收的N个符号来解调N个数据。

    BEACON RE-BROADCASTING APPARATUS, BEACON RE-BROADCASTING METHOD, AND INITIAL ACCESS REQUEST METHOD IN WIRELESS NETWORK
    7.
    发明申请
    BEACON RE-BROADCASTING APPARATUS, BEACON RE-BROADCASTING METHOD, AND INITIAL ACCESS REQUEST METHOD IN WIRELESS NETWORK 审中-公开
    BEACON RE-BROADCASTING APPARATUS，BEACON RE-BROADCASTING METHOD，AND INITIAL ACCESS REQUEST METHOD IN WIRELESS NETWORK

    公开(公告)号：WO2009072761A2

    公开(公告)日：2009-06-11

    申请号：PCT/KR2008006805

    申请日：2008-11-19

    Applicant: KOREA ELECTRONICS TELECOMM ,  KO GWANGZEEN ,  SONG MYUNG-SUN ,  HWANG SUNG-HYUN ,  UM JUNG-SUN ,  KIM CHANG-JOO ,  YOU SUNG-JIN

    Inventor： KO GWANGZEEN ,  SONG MYUNG-SUN ,  HWANG SUNG-HYUN ,  UM JUNG-SUN ,  KIM CHANG-JOO ,  YOU SUNG-JIN

    IPC: H04L12/28

    CPC classification number: H04W16/14 ,  H04W48/12 ,  H04W72/02 ,  H04W74/004 ,  H04W84/18

    Abstract: Provided are a beacon re-broadcasting apparatus, a beacon re-broadcasting method, and an initial access request method in a wireless network. In the re-broadcasting apparatus and method, a beacon frame including beacon information for communications in the wireless network and information on an echo beacon slot allocated for beacon re-broadcasting among time slots of a superframe is received from a management device for managing the wireless network in which a plurality of terminals communicated with each other through the superframe including time-divided time slots, and the beacon information is re-broadcasted during the echo beacon slot. Accordingly, the beacon information can be received in various environments, and the beacon information can be received to an adjacent network in addition to the corresponding network. Therefore, frequency resources can be shared and effectively used between networks, and convenience and efficiency in network operation can be maximized.

    Abstract translation: 提供了一种无线网络中的信标再广播设备，信标再广播方法和初始接入请求方法。 在重新广播装置和方法中，从用于管理无线网络的管理装置接收包括用于无线网络中的通信的信标信息的信标帧和分配给超帧时隙之间的信标重新广播的回波信标时隙的信息 网络，其中多个终端通过包括时分时隙的超帧彼此通信，并且在回波信标时隙期间重新广播信标信息。 因此，可以在各种环境中接收信标信息，除了对应的网络之外，也可以将信标信息接收到相邻网络。 因此，频率资源可以在网络之间共享和有效地使用，网络运营的方便性和效率可以最大化。

    METHOD OF GENERATING PILOT PATTERN FOR ADAPTIVE CHANNEL ESTIMATION IN OFDMA SYSTEMS, METHOD OF TRANSMITTING/RECEIVING USING THE PILOT PATTERN AND APPARATUS THEREOF
    8.
    发明专利
    METHOD OF GENERATING PILOT PATTERN FOR ADAPTIVE CHANNEL ESTIMATION IN OFDMA SYSTEMS, METHOD OF TRANSMITTING/RECEIVING USING THE PILOT PATTERN AND APPARATUS THEREOF 未知

    公开(公告)号：CA2650462C

    公开(公告)日：2013-01-22

    申请号：CA2650462

    申请日：2007-04-24

    Applicant: KOREA ELECTRONICS TELECOMM

    Inventor： HWANG SUNG-HYUN ,  KIM CHANG-JOO ,  SONG MYUNG-SUN ,  UM JUNG-SUN

    IPC: H04L27/26

    Abstract: Provided is a method of generating a pilot pattern capable of perform adaptive channel estimation, and a method and apparatus of a base station and a method and apparatus of a terminal using the pilot pattern. The pilot pattern selects pilot symbol positions based on distances from pilots of previous orthogonal frequency division multiple access (OFDMA) symbols to a subcarrier position of a current OFDMA symbol in the frequency domain and the time domain, so that a low pilot density is maintained so as to effectively transmit data, and stable channel estimation performance can be obtained even in a bad channel environment. In addition, the minimum burst allocation size is determined according to the channel environment between the base station and the terminal, guaranteeing channel estimation performance suitable for the channel environment, and improving granularity, channel estimation latency, and channel estimation memory size.

    METHOD AND APPARATUS OF HYBRID BURST MAPPING IN OFDMA SYSTEMS
    9.
    发明专利
    METHOD AND APPARATUS OF HYBRID BURST MAPPING IN OFDMA SYSTEMS 未知

    公开(公告)号：CA2689496A1

    公开(公告)日：2008-12-24

    申请号：CA2689496

    申请日：2008-06-11

    Applicant: KOREA ELECTRONICS TELECOMM

    Inventor： KO GWANGZEEN ,  KIM CHANG-JOO ,  SONG MYUNG-SUN ,  HWANG SUNG-HYUN ,  UM JUNG-SUN

    IPC: H04L27/26

    Abstract: Provided are a method of adaptively allocating appropriate hybrid bursts according to terminal attributes including terminal position, channel state, and service type in an orthogonal frequency-division multiple access (OFDMA ) system, and an upstream-MAP information element (US-MAP IE) structure supp orting the method. The method includes dividing an upstream subframe into a plurality of zones depending on the number of OFDMA symbols and allocating b ursts of a zone to a terminal according to the terminal attributes. Bursts a re formed by allocating slots along a time axis in the upstream subframe, an d are formed by allocating slots along a frequency axis in a downstream subf rame.

    METHOD AND APPARATUS FOR ALLOCATING HYBRID BURSTS IN OFDMA SYSTEM
    10.
    发明专利
    METHOD AND APPARATUS FOR ALLOCATING HYBRID BURSTS IN OFDMA SYSTEM 未知

    公开(公告)号：CA2689496C

    公开(公告)日：2015-08-18

    申请号：CA2689496

    申请日：2008-06-11

    Applicant: KOREA ELECTRONICS TELECOMM

    Inventor： HWANG SUNG-HYUN ,  UM JUNG-SUN ,  SONG MYUNG-SUN ,  KIM CHANG-JOO ,  KO GWANGZEEN

    IPC: H04L27/26

    Abstract: Provided are a method of adaptively allocating appropriate hybrid bursts according to terminal attributes including terminal position, channel state, and service type in an orthogonal frequency-division multiple access (OFDMA) system, and an upstream-MAP information element (US-MAP IE) structure supporting the method. The method includes dividing an upstream subframe into a plurality of zones depending on the number of OFDMA symbols and allocating bursts of a zone to a terminal according to the terminal attributes. Bursts are formed by allocating slots along a time axis in the upstream subframe, and are formed by allocating slots along a frequency axis in a downstream subframe.

Patent Agency Ranking