Abstract:
PURPOSE: An ARQ protocol performance improving method and device are provided to set the operation time of a timer according to the error-detecting-timeout timer motion of a receiver. CONSTITUTION: A transmitter receives a local ACK of ARQ block transmitted from a receiver(S605). A transmitter compares SNR value of HARQ feedback message received time of the local ACK and a standard value(S610). A transmitter postpones the determination of receiving success of ARQ block(S615). A transmitter determines a reception of ARQ block as a success(S620). A transmitter starts timer operation of ARQ block(S625). A transmitter decides request repeat of the corresponding block according to the receiving state of ARQ feedback message of corresponding block before the timer expiration time(S630). A transmitter receives an ARQ feedback message from the receiver(S635). A transmitter performs a retransmission of ARQ block(S640). [Reference numerals] (AA) Start; (S605) Receiving a local ACK of an n-th ARQ block; (S615) Holding off the determination of receiving success of the n-th ARQ block; (S620) Determining receiving success of the n-th ARQ block; (S625) Starting timer operation of (n-1)-th or lower ARQ blocks; (S630) Timer expired?; (S635) Receiving an ARQ feedback message; (S640) Performing retransmission of the ARQ block receiving the feedback; (S645) Determining receiving success of the (n-1)-th or lower ARQ blocks
Abstract:
본 발명은 다수개의 채널들을 사용하는 통신 시스템에서 송신기가 다수개의 수신기들 각각으로부터 수신된 채널 품질 정보(Channel Quality Information: CQI)를 근거로 상기 다수개의 수신기들 각각에 대해 할당 가능한 채널들을 결정하고, 상기 CQI 및 상기 결정된 채널들 별 상기 다수개의 수신기들 각각으로 송신된 평균 데이터량을 근거로 상기 결정된 채널들 별 상기 다수개의 수신기들 각각에 대한 채널 할당 우선순위를 결정하고, 상기 결정된 채널 할당 우선순위에 따라, 상기 다수개의 수신기들 각각에 채널을 할당한다. 병렬 패킷 스케쥴러, 채널 할당, 비례 공평성(Proportional Fairness) 스케쥴링 방식
Abstract:
An opportunistic packet scheduling apparatus and method in a wireless access communication system using multi-hop relay are provided to increase system efficiency and fairness in distributing radio resources by implementing centralized opportunistic scheduling. A current radio resource efficiency calculating unit(401) calculates efficiency values of the current radio resources and outputs the calculated results to a scheduling priority metric calculating unit(403) and an average radio resource efficiency calculating unit(405). The scheduling priority metric calculating unit(403) calculates scheduling priority metric by using an average radio resource efficiency value, and outputs it to a maximum priority metric user selecting unit(407). The average radio resource efficiency calculating unit(405) calculates and updates the average radio resource efficiency value, and outputs the calculated average radio resource efficiency value to the scheduling priority metric calculating unit(403). The maximum priority metric user selecting unit(407) selects a user having the maximum priority metric and outputs state information of the user selected from a user queue to the average radio resource efficiency calculating unit(405).
Abstract:
본 발명은 다중 홉 중계방식을 사용하는 광대역 무선 통신 시스템에서 무선자원 재사용과 서비스품질을 고려한 기회적 패킷 스케줄링 장치 및 방법에 관한 것으로, 다중 홉 중계방식을 사용하는 광대역 무선 통신 시스템에서 무선자원 재사용을 고려한 기회적 패킷 스케줄링 방법에 있어서, 각 사용자 단말 경로별로 사용자 단말과 중계기가 보고하는 채널정보를 수집하고 자원할당 크기( )를 초기화하는 과정과, 상기 각 사용자 단말 경로별 상기 자원할당 크기( )를 비교하여, 경로별 자원 재사용 여부를 결정하는 과정과, 상기 자원 재사용 여부를 반영한 각 사용자 단말 경로별 현재 무선자원 효율과 서비스품질(QoS) 요구조건을 만족시키는 위한 파라미터를 계산하는 과정과, 상기 현재 무선자원 효율과 상기 QoS 파라미터를 이용하여 각 사용자 단말의 스케줄링 우선순위 지표를 계산하는 과정을 포함하여, 시스템의 효율을 증대시키고 사용자에게 개선된 QoS를 제공하는 이점이 있다. 다중 홉 중계, 중계기, 무선자원 재사용, 패킷 스케줄링. M-LWDF(Modified Largest Weighted Delay First), QoS(Quality Of Service).
Abstract:
PURPOSE: A ranging system for transmitting ranging signal to a plurality of base stations by using common ranging resource is provided to simplify a ranging process by transmitting a ranging parameter to a ranging terminal. CONSTITUTION: A receiving unit(410) receives ranging resource assignment information from a connection base station(430). A transmitting unit(420) transmits the ranging signal to ranging base stations. The receiving unit receives ranging parameter which the ranging base station produces from the connection base station. The ranging base station includes a plurality of connection base stations. The receiver receives the list toward the base stations from the access base station. The transmit unit transmits the ranging signal with reference to a list toward the base stations.
Abstract:
An apparatus and a method for distributing radio resources in a multi-hop relay broadband wireless access communication system are provided to increase the transmission efficiency without a waste of resources of an overall system by evenly distributing radio resources to relay stations that re-use frequency resources by using two types of schedulers. A priority level of each transmission packet is determined so that channels can be evenly allocated to relay stations that use the same radio resources by using an inter-scheduling and intra-scheduling. The number of sub-channels required for transmitting packets is determined according to each priority level, and a temporary frame is generated to determine the number of sub-channels to be allocated to the relay stations that use the same radio resources. Packets included in the generated temporary frame are divided by link and allocated by sub-channel.
Abstract:
A scheduling method in a communication system using plural channels and a device thereof are provided to perform scheduling correspondingly to CQI(Channel Quality Information) of channels which change according to time and CQI of MSs(Mobile Stations), thereby improving system performance. M queues(311-1~311-M) store data targeting on each of M receivers serviced by a transmitter. A scheduler(313) allocates receivers for receiving the data through each of B channels among the M receivers according to a scheduling method preset at a scheduling time. The scheduling method refers to a proportional fairness scheduling method.