Abstract:
PURPOSE: A method for operating a relay station is provided to improve the quality of a transmission signal and to increase a transmission rate by utilizing multiple bands and a collaborative transmission. CONSTITUTION: A method for operating a relay station comprises the steps of: giving feedback for an SINR value of a link, estimated in a terminal, to a base station; transmitting data to a base station-relay station link by using an allocated sub-frame; performing a collaborative transmission by using a sub frame allocated after the data transmission is performed; and allocating a band to each link for the data transmission and collaborative transmission.
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.