Abstract:
본 발명은 다중 홉 중계 방식을 사용하는 광대역 무선 통신 시스템에서 무선자원 재사용을 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 단말 경로별로 사용자 단말과 중계기가 보고하는 채널정보를 수집하는 과정과, 상기 채널정보를 이용하여 각 홉별로 자원 재사용 그룹 내에서 최대 자원할당 크기와 상기 자원 재사용 그룹의 각 단말별 자원할당 크기를 초기화하는 과정과, 상기 자원 재사용 그룹 내에서 최대 자원할당 크기와 상기 자원 재사용 그룹의 각 단말별 자원할당 크기를 이용하여 같은 자원 재사용 그룹 내의 다른 기지국 또는 중계기에 의해 사용된 자원의 재사용 여부를 판단하는 과정과,상기 자원 재사용 여부를 반영하여 해당 사용자 단말 경로의 현재 무선자원 효율을 계산하는 과정을 포함하여, 프레임 내에서 자원 재사용률을 높일 수 있는 사용자 단말에 상대적으로 높은 우선 순위를 부여함으로써 시스템 무선 자원 효율을 증가시키고, 무선 자원 분배의 형평성을 개선시킬 수 있는 이점이 있다. 다중 홉 중계, 중계기, 무선자원 재사용, 패킷 스케줄링.
Abstract:
PURPOSE: A method and apparatus for distinguishing a physical cell identifier in a wireless communication system are provided to allocate an efficient PCID(Physical Cell IDentifier) by using a code reuse pattern. CONSTITUTION: A controller(710) obtains a PCID list from a server. The controller determines one or more candidate PCIDs from the PCID list according to a PCID allocation condition. A transceiver(720) measures the strength of a radio signal about cells that use one or more candidate PCIDs. A PCID selecting unit(730) selects one or more PCIDs by using the reception signal strength of cells.
Abstract:
PURPOSE: A method and a device for managing an adjacent base station in a communication system are provided to add another base station to an adjacent base station list through a penalty list, thereby suppressing an operation that another base station is added or removed to and from the adjacent base station list. CONSTITUTION: A serving base station registers a specific adjacent base station in a base station penalty list(213). The serving base station informs a communication terminal of base station penalty list deletion of the adjacent base station(223). The communication terminal searches the adjacent base station(227). The communication terminal reports the searched adjacent base station to the serving base station(229). The serving base station adds the adjacent base station to an adjacent base station list in consideration of the base station penalty list(231).
Abstract:
PURPOSE: A system for ranging based on a partitioned radio resource is provided to redistribute a wireless resource efficiently according to the ranging success of a terminal. CONSTITUTION: A system for ranging based on a partitioned radio resource includes a terminal classifying unit(210), a wireless resource allocation unit(220), a transmitting unit(230) and a receiving unit(240). The terminal classifying unit classifies terminals related to a base station into plural groups, and the wireless resource allocation unit allocates the wireless resources, which allocated to the base station device, to each group. The transmitting unit transmits the information for the wireless resources, which are allocated to the first group, to the first group. The receiving unit receives a ranging signal from terminals by using the wireless resources allocated to the first group.
Abstract:
An opportunistic packet scheduling apparatus and method in consideration of re-use of radio resources in a broadband wireless communication system using multi-hop relay are provided to improve the balance of distribution of radio resource. A current radio resource efficiency calculating unit(500) initializes the size of a maximum resource allocation in a resource re-use group and the size of resource allocation of each terminal of the resource re-use group by hop by using channel information reported by a user terminal and a repeater according to each terminal path, and calculates the efficiency of current radio resources of a corresponding user terminal path by reflecting whether or not resources used by a different BS(Base Station) or repeater within the resource re-use group. A scheduling priority index calculating unit(502) calculates a scheduling priority index at a ratio of an average radio resource efficiency of each user terminal and the efficiency of the current radio resources. A maximum priority index user selecting unit(504) selects a user terminal with the largest scheduling priority index, and performs scheduling on the selected user terminal.
Abstract:
A scheduling apparatus in a communication system using plural channels and a method thereof are provided to enable scheduling in case of using not only a single channel but also a number of channels, by providing a scheduling method using plural channels in an IEEE 802.16e communication system. According to a scheduling apparatus in a transmitter of a communication system using B channels, M queues(411-1-411-M) store data targeting each of M receivers serviced in the transmitter. A scheduler(413) allocates a receiver for transmitting data through each channel of the M receivers in correspondence to the scheduling scheme predetermined in the time of scheduling.
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