Abstract:
PURPOSE: A method for an individual cell SINR(Signal to Interference and Noise Ratio) model is provided to measure the degree of performance and to optimize a communication system considering interference cancellation. CONSTITUTION: The intensity of an R2 signal that is received from a base station of a second cell is obtained from a second user terminal according to a transmission signal(S310). The intensity of an R1 signal that is received from a base station of a second cell is obtained from a first user terminal according to a transmission signal(S320). The value of a parameter is calculated(S330). The resource allocation of a first user terminal is performed based on the calculated parameter(S340).
Abstract:
PURPOSE: A method and a wireless communications device thereof are provided to improve the number of wireless communications devices which satisfy the QoS in the entire network by effectively controlling interference between cells. CONSTITUTION: A channel is allocated from the base station of a cell(S210). A communications process is executed by allocating transmission power to a plurality of sub-channels according to a water filling algorithm(S230). A threshold value is controlled based on a minimum QoS transmission rate, a transmission rate which is previously achieved according to a sub-channel, and a transmission power according to a sub-channel(S250). A communications process is executed by allocating transmission power to the sub-channel according to a water filling algorithm(S290).
Abstract:
본 발명은 OFDMA 무선 인지 네트워크에서의 허락제어와 결합된 실행편이 자원할당 방법에 관한 것으로, 상기 방법은, 보조 송신 노드에 대한 초기 채널 스케쥴링 및 초기 전력 할당 단계; 메인 시스템의 해당 채널 사용 여부를 판단하는 단계; 메인 시스템이 해당 채널을 사용하고 있는 것으로 판단된 경우, 제한 구역 내에 다수의 보조 노드가 동시적으로 스케줄링되어 있는지 판단하는 단계; 상기 다수의 보조 노드가 동시적으로 스케줄링되어 있는 것으로 판단된 경우, 현재 주어진 네트워크 환경에 최적화된 아웃티지(outage) 확율 조건값 α(α>1)와, 위배(violation) 확율 조건값 β가 존재하는지의 여부를 판정하는 단계; 및 상기 주어진 네트워크 환경에 최적화된 α 및 β가 존재하지 않은 것으로 판정된 경우, 상기 α 및 β값을 찾기 위한 튜닝모드를 수행하고, 상기 주어진 네트워크 환경에 최적화된 α 및 β가 존재하는 것으로 판정된 경우, 상기 α 및 β값을 이용한 블라인드 모드를 수행하는 단계를 포함한다. OFDMA, 무선 인지, 802.11, 자원 할당, 허락제어, 아웃티지, 위배
Abstract:
PURPOSE: A method and a device for allocating an implementation friendly resource coupled with admission control in an OFDMA(Orthogonal Frequency Division Multiple Access) wireless cognitive network are provided to control concentration interference, thereby protecting a main system. CONSTITUTION: Initial channel scheduling and power allocation are performed about each sub transmission node(201). It is confirmed that a channel of a main system is used(202). When the main system operates in a corresponding channel and an adjacent channel, simultaneous scheduling of nodes is confirmed(203). It is confirmed that α and β values optimized for a given network environment exist(204). A proposed algorithm is driven at a tuning mode(205). The proposed algorithm is driven at a blind mode(206).
Abstract:
PURPOSE: A method for an individual cell SINR(Signal-to-Interference plus Noise Ratio) model is provided to measure the degradation of performance due to interference by the other user. CONSTITUTION: An interference control unit decides the maximum of a receiving SINR(Signal-to-Interference plus Noise Ratio) in a BS2(Base Station2)(S210). The interference control unit decides an approximation equation for the receiving SINR with the application of a correction coefficient to the equation of the receiving SINR(S220). The interference control unit obtains a correction coefficient for the minimization of difference between the receiving SINR and the approximation equation(S230). The interference control unit performs interference control on the basis of calculated parameters(S240).
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.
Abstract:
복수의 부채널들에 송신 전력을 할당하는 방법 및 이를 이용하는 무선 통신 기기가 개시(disclose)된다. 일실시예에 따른 방법은 (a) 총 송신 전력이 미리 설정된 임계치 이하인 것을 제한 조건으로 하는 워터 필링 알고리즘에 따라 복수의 부채널들 각각에 송신 전력을 할당하여 통신을 수행하는 단계; (b) 최소 요구 전송률, 이전에 성취한 부채널별 전송률, 및 이전에 할당한 부채널별 송신 전력을 기초로 상기 임계치를 조절하는 단계; 및 (c) 총 송신 전력이 상기 조절된 임계치 이하인 것을 제한 조건으로 하는 워터 필링 알고리즘에 따라 상기 복수의 부채널들 각각에 송신 전력을 할당하여 통신을 수행하는 단계를 포함한다.