Abstract:
Disclosed is a beamforming method based on a cluster, capable of improving the transmission performance of data by using a millimeter wave band. The beamforming method performed in a base station includes the steps of: transmitting control information to a plurality of terminals; receiving measurement information corresponding to the control information from the terminals; grouping the terminals into a plurality of groups based on the received measurement information; and transmitting the received measurement information to an upper base station by beamforming. Thereby, a high speed data transmission is performed through a small cell communication environment based on a beam using the millimeter wave band. [Reference numerals] (100) Central base station; (200) Relay base station; (300) Mobile terminal; (S210) Control information; (S220) Perform measurement from received control information; (S230) Measurement information; (S240) Mobile terminal grouping; (S250) Measurement information; (S260,270) Service request; (S280) Beamformed information; (S290) Service response
Abstract:
The present invention relates to a method for communication on a millimeter wave-optical combination network. A system for optical-wireless combination communication using millimeter waves comprises: a central control unit for transmitting a beacon message converted to an optical signal using an optical link where an uplink and a downlink are distinguished; base stations located in each shield space to receive the beacon message, convert the beacon message to a millimeter wave band signal, and transmit the beacon message, converted to the millimeter wave band signal, by direction using a predetermined width of beam in each shield space; a splitter for transmitting the beacon message, converted to the optical signal, to the base stations and transmitting signals among the base stations, using the optical link; and terminals for receiving the beacon message, converted to the millimeter wave band signal, from the base stations located in each shield space, and communicating with adjacent terminals located in the same shield space or adjacent terminals located in another shield space, based on information included in the beacon message. [Reference numerals] (411,413,431,433) Terminal; (420,440) Base station; (450) Splitter; (460) Central control unit; (461) Electrophotic conversion part; (463) Photoelectric conversion part; (465) Transceiver; (467) Power blocking part
Abstract:
PURPOSE: A communication system for determining a data transmission scheme according to a channel state is provided to enhance a capacity of a wireless channel in a high-directivity band. CONSTITUTION: A transmission apparatus forms a transmission beam in a specific direction using a plurality of transmit antennas in step 110. The transmission apparatus sequentially changes a direction of the transmission beam in step 142. The transmission apparatus transmits a training signal to the reception apparatus using the formed transmission beam in step 120. The transmission apparatus determines whether a response signal is received from the reception apparatus with respect to the training signal using the formed transmission beam in step 130. The transmission apparatus determines whether a rotation of the transmission beam is completed in step 140. When the rotation of the transmission beam is complete, the transmission apparatus determines a data transmission scheme in step 141. [Reference numerals] (110) Form a transmission beam; (120) Transmit a training signal; (130) Receive a response signal?; (131) Store the direction of the transmission beam; (140,180) Complete rotation?; (141) Determine a method to transmit; (142,182) Sequentially change; (150) Form a reception beam; (160) Receive the training signal?; (161) Store the size and the direction of the reception beam; (170) Transmit the response signal; (181) Initializing the direcion of beam; (AA,CC,EE,GG) No; (BB,DD,FF,HH) Yes
Abstract:
광대역 고주파수 무선 시스템에서 분산 노드의 시간 동기화 방법 및 장치를 제안한다. 분산 노드의 시간 동기화 방법은 슈퍼프레임의 각 수신 시점에서 수신노드 클럭과 송신노드 클럭을 계산하고, 상기 각 수신 시점의 상기 수신노드 클럭과 상기 송신노드 클럭을 이용해서 상기 각 수신 시점의 동작 오프셋들을 계산하고, 상기 동작 오프셋들 중에서 그 값이 가장 큰 최대 동작 오프셋을 이용해서 맥 인터페이스 클럭(MCLK)를 수정할 수 있다. 시간 동기화, 분산 노드, 광대역 고주파 무선 시스템
Abstract:
분산 매체 접근제어를 사용하는 무선통신 시스템에서 다중 경로를 사용한 데이터 송수신 장치 및 그 방법을 개시한다. 본 발명은 분산 매체 접근 제어 (Distributed MAC)을 사용하고 지향성 안테나(Directional antenna)를 사용하여 가시 거리(Line of Sight)를 통해 데이터를 전송하는 무선 통신 시스템에서 LOS를 사용하는 다이렉트 경로(direct path)와 릴레이 장치를 경유하는 릴레이 경로(relay path)를 포함하는 다중 경로 중에서 가장 좋은 채널의 경로를 선택하여 데이터를 전송하는 방법 및 그 장치에 관한 것이다. LOS(Line of Sight), 릴레이 경로, 분산 매체 접근 제어
Abstract:
PURPOSE: A method, a transmitter and a receiver for selecting a transmission channel through transmission antennas in a wideband high frequency wireless system are provided to select an antenna which provides the highest transmission rate, thereby maximally keeping a data transmission rate between a transmitter and a receiver. CONSTITUTION: A receiver receives the first channel detection response message(S820). The first channel detection response message includes state information of the first channel by the first antenna. A transmitter transmits a channel detection request message to a receiver through the second antenna(S830). The channel detection request message requests state information of a channel made by the second antenna. The receiver receives the second channel detection response message(S840). A transmission rate calculating unit calculates a data transmission rate through the first and second channels(S850). The transmitter transmits data through the antenna(S860). The antenna is selected based on the calculated data transmission rate.
Abstract:
본 발명은 광-동축 혼합 망에서의 상향 채널 자원 할당 방법 및 그 장치를 제공한다. 본 발명은 케이블종단장치가 UCD 메시지의 확장 IUC를 통해 미리 다수의 버스트 프로파일을 케이블 모뎀에 제공하고, 상향 채널 상태에 따라 최적 버스트 프로파일을 사용하여 케이블 모뎀에 자원을 할당한다. 이로써 상향 채널의 전송효율을 증가시킬 수 있다. DOCSIS, 광동축 혼합망, 버스트 프로파일, 확장 IUC, 상향 채널
Abstract:
본 발명의 일실시예에 따른 조정자 장치의 통신 방법은 예약 기반의 매체 접근 제어를 이용하는 무선 시스템의 조정자 장치(Coordinator)의 통신 방법에 있어서, 소스 장치가 데스티네이션 장치에게 전송하는 프레임이 릴레이 장치를 경유하여 중계될 수 있도록 하기 위하여 상기 소스 장치로부터 상기 릴레이 장치를 위한 예약 자원을 요청하는 프레임을 수신하는 단계; 및 상기 요청에 따라 상기 릴레이 장치를 위한 예약 자원을 할당하는 단계를 포함한다.
Abstract:
PURPOSE: A source apparatus using a directional antenna, destination apparatus, and communication method of relay apparatus are provided to syntagmatically use a reservation section irrespective of a transmission method. CONSTITUTION: A first link or a source apparatus is directly connected from the source apparatus to a destination apparatus. A state of a second link that is connected to the destination apparatus through a relay apparatus is detected from the first link or the source apparatus(103). One link is selected based on detection result of the first link and the second link(105). Data is transmitted using selected link(107).