Abstract:
PURPOSE: A method for transmitting and receiving data in a wireless communication system supporting a relay and an apparatus thereof are provided to utilize radio resource more efficiently and to perform data transfer successfully, when the data is transferred through a user-relay in transmitting the data to one terminal from a base station. CONSTITUTION: A processor (1313) is connected to a receiving module and a transmission module. The processor controls the operation of a base station. The processor transmits a signal including first data, which is to be transferred to a terminal by a relay, to the relay through the transmission module. The processor transmits a signal including second data to the terminal through the transmission module. The processor receives hybrid automatic repeat request (HARQ) confirmation response information about the first data transferred to the terminal through the relay from the terminal through the receiving module. [Reference numerals] (1311,1321) Reception module; (1312,1322) Transmission module; (1313,1323) Processor; (1314,1324) Memory
Abstract:
PURPOSE: A relay communication method in a multi-terminal relay system is provided to execute relay communication through an optimal relay node. CONSTITUTION: A destination node determines an RD(Relay-Destination) channel level by allowing a relay node to overhear a signal transmitted by a source node(S330). The relay node transmits the R-D channel level to the source node(S340). The source node selects the relay nodes based on S-R(Source-Relay) channel information between the source node and the relay node and the R-D channel levels received from a plurality relay nodes(S350). The source node communicates with the destination node through the selected relay node(S370). [Reference numerals] (AA) Start; (BB) End; (S310) Source node transmits signals to relay nodes and a target node; (S320) Target node transmits ACK/NACK to the source node; (S330) Relay nodes overhear signals transmitted by the target node and estimates an R-D channel level; (S340) Relay nodes feedback R-D channel information; (S350) Source node selects a relay based on S-D channel information and the R-D channel information; (S360) Source node provides proactive scheduling information to the selected relay; (S370) Transmit data through the selected relay
Abstract:
PURPOSE: A partial signal transmitting method under multi node cooperation communication is provided to reduce the size of a signal to be transmitted to a mobile terminal using superposition coding and successive interference cancellation techniques. CONSTITUTION: A base station(100a) selects relays(110a,120a) which have a superior connection stat with a first mobile terminal(130a) and a second mobile terminal(140a). The base station obtains a first signal by superposition-coding a signal to be transmitted to the first terminal. The base station obtains a second signal by superposition-coding a signal to be transmitted to the second terminal. The base station transmits the first and second signals to the first and second terminals.
Abstract:
PURPOSE: A multi data stream transceiving method of multi antenna relay system is provided to relay only part information of multi data stream received from a source node in a cooperative data transmission using a relay node. CONSTITUTION: Channel information between a source node(10) and a relay node(20) is received from the source node or the relay node. The information between the source node and a destination node(30) and channel information between the relay node and the destination node are obtained through channel estimation. A transfer rate is calculated of first data and second data. An optimize precodding matrix is determined. A determined optimized precoding matrix element is fed back to the source node.
Abstract:
PURPOSE: A system for CR(Cognitive Radio) communication and a spectrum sensor are provided to improve the sensing performance of the spectrum of a primary user. CONSTITUTION: A plurality of spectrum sensor(120) is dispersedly arranged in an installation space to independently receive a radio signal each other. The plurality of spectrum sensors creates information about whether a primary user appears with spectrum sensing. A collection center(110) is connected to the plurality of spectrum sensors through a network. The collection center collects the information from the plurality of spectrum sensors.
Abstract:
PURPOSE: An intelligent transport system is provided to implement excellent receiving performance while being easily applied to a conventional intelligent transport system. CONSTITUTION: In an intelligent transport system, a first user terminal is located in a first vehicle. A second user terminal is located in a second vehicle. A base station transmits a signal. The first user terminal relays the signal received from the base station to a plurality of transmission antennas through an amplification and forwarding mode. The second user terminal receives the signal transmitted from the base station and the signal transmitted from the first user terminal.
Abstract:
본 발명은 무선 통신 환경의 무선 채널 상태가 불안정한 경우 소스의 데이터를 수신한 릴레이 노드가 데이터 재전송을 수행하는 릴레이 통신에서, 분산적 방법(distributed manner)으로 다수개의 릴레이 중에서 최적의 QoS 릴레이를 선택하기 위한 송신확률 산출 장치 및 그 방법에 관한 것이다. 본 발명에 따르는 송신 확률 산출 장치는, 소스로부터 데이터를 수집하는 데이터 저장부(121); 소스와 재전송 릴레이 사이의 채널 분포 정보를 인식하는 채널 분포 정보 판별단(122); 상기 채널 분포 정보가 경쟁 릴레이 집단에 포함되는지를 결정하여 1차 릴레이를 선별하는 디코딩 셋 판별부(123); 목적지로부터의 전송 확인(ACK) 메시지 및 재전송 요청(NACK) 메시지를 수신하는 채널 정보 수집단(131); 목적지와 릴레이 사이의 채널 이득을 토대로 2차 릴레이를 선별하는 전송 셋 판별부(132); 상기 1차 및 2차 릴레이 선별 작업으로부터 추정된 QoS 릴레이 군을 목적지와 릴레이 사이의 채널 이득을 고려하여 분류하는 릴레이 그루핑부(133); 및 상기 분류에 의해 차별화된 구간을 통한 최적의 송신 확률을 계산하는 송신 확률 산출부(134)에 의해 구성되는 것을 구성적 특징으로 한다. QoS 릴레이, 1차 릴레이, 2차 릴레이,
Abstract:
PURPOSE: A device and a method for allocating a semi distributed resource in a wireless communication system based on cognitive communication are provided to adjust maximum transmitting power of terminals, thereby preventing interference to a system with a license and maximizing performance of a cognitive wireless system. CONSTITUTION: If a system with a license is activated, it is determined whether each terminal in a cell satisfies QoS(105). When all terminals satisfy QoS, a binary message showing ON is broadcast to neighbor base stations. If at least one of the terminals does not satisfy QoS, a binary message showing OFF is broadcast to the neighbor base stations. It is determined whether to satisfy the QoS according to each transmission rate or channel quality of terminals.