Abstract:
PURPOSE: A method for automatically searching a low-power BS supporting the access of registered users in a mobile communication system and a device thereof are provided to reduce battery consumption and unnecessary gap allocation of a terminal. CONSTITUTION: A white list stores the CSG ID of CSG cells in which a terminal is connectable. An automatic CSG cell searcher checks the requirement of automatic searching about the CSG cell. If an automatic searching is not required, the automatic CSG cell searcher turns off automatic CSG cell search function of the terminal by emptying the white list(203). If an automatic searching is required, the automatic CSG cell searcher turns on automatic CSG cell search function of the terminal by updating the white list(207).
Abstract:
A system for allocating uplink resources in a communication system and a method thereof are provided to make a base station change and assign an uplink resource, which is exclusively assigned to a mobile station early, in case a mobile station requests it. If a base station detects the fact that it has to provide the service of a specific service quality class to a mobile station, it transmits the first uplink resource allocation information and then assigns the first uplink resource to the mobile station as an exclusive resource(613,615). The base station receives an uplink resource allocation request(617), and then checks whether the uplink resource to be assigned to the mobile station exists(619). If so, the base station transmits the second uplink resource allocation information and then assigns the second uplink resource to the mobile station as an exclusive resource(621,623). The base station release the first uplink resource allocation(625).
Abstract:
A method and an apparatus for allocating resources in a communication system are provided to improve the efficiency of data transmission and stably providing services to users. A scheduler checks a QoS(Quality of Service) parameter of each data packet generated to be transmitted to MSs(Mobile Stations), and updates a scheduling parameter according to QoS of each data packet(201). The scheduler determines a connection priority level and transmission urgency level of each data packet, sets a scheduling priority level according to the determined connection priority level and the transmission urgency level, and performs scheduling according to the set scheduling priority level(203). The scheduler checks whether there exist resources that can be allocated(205). If there are resources that can be allocated, the scheduler performs scheduling.
Abstract:
A method and an apparatus for classifying packet data of each service flow in a communication system are provided to provide a service by service flows according to a service class included in an IP(Internet Protocol) header or a service label. When an IP packet arrives from an upper layer of a terminal, a classifier performs the first classification according to the first classification information of a header of the IP packet(500,502). The classifier checks whether the IP packet includes the second classification information(504). If the IP packet includes the second classification information, the classifier performs the second classification(506). The classifier checks whether detailed QoS(Quality of Service) information has been received from the upper layer(508). If there is detailed QoS information received from the upper layer, the classifier performs the third classification according to the detailed QoS(512) and transfers the IP packet together with a control message including the detailed QoS information to the second layer of the terminal.
Abstract:
A device for improving link performance of a multicast service in a wireless system and a method therefor are provided to increase a receiving opportunity of retransmission packets of cell border users as using the same amount of radio resources, thereby improving link level performance of the multicast service of the users. If multicast data is received on the Nth frame, the data is restored by using systematic packets of the data(501). If the restoration of the data fails, parity packets of the data are received on the N+1th frame, and the data is restored by using the received parity packets(503,505). If the restoration of the data fails, autonomous handover is performed to receive the parity packets of the data from neighboring cells or sectors, and the data is restored by using the received parity packets(507,509).
Abstract:
본 발명은 패킷 기반 실시간 서비스를 지원하는 무선 통신 시스템에서 현재 연결된 채널 외에 다른 채널을 통해 제어 패킷을 전송하기 위한 상향링크 자원을 할당하는 방법에 관한 것이다. 이를 위해 본 발명에서는 기존에 동일한 연결에 대해서만 사용하던 피기백 요청 (piggyback request)을 다른 연결에 대해서도 사용할 수 있도록 그랜트 관리 서브헤더의 새로운 포맷을 제안한다. 그리고 새로이 제안된 그랜트 관리 서브헤더를 이용하여 다른 연결을 위한 자원 할당을 요청할 수 있도록 한다. 이와 같이 그랜트 관리 서브헤더를 이용하여 새로운 연결에 대한 자원 할당을 요청하게 되면, 해당 자원을 할당 받기까지의 소요 시간을 줄일 수 있을 뿐만 아니라 기존의 연결에 대해 할당된 자원의 손실 또한 최소화할 수 있다. ertPS, 확장 실시간 폴링 서비스, 데이터 레이트 변경
Abstract:
A system and method for handover in a mobile communication system are provided to prevent data reception delay or errors due to scanning by making a mobile station execute scanning only in one frequency band or one frequency operation mode in a communication system where a base station operates at least two frequency bands or uses at least two frequency operation modes. A serving base station periodically transmits a neighbor base station advertisement(MOB_NBR-ADV) message to a mobile station(302). Receiving the MOB_NBR-ADV message, the mobile station decides to perform scanning for handover if signal strength of the serving base station falls below preset critical signal strength(304). The mobile station transmits a MOB_SCN-REQ(Mobile_Scanning Interval Allocation-Request) message to the serving base station(306). Receiving the MOB_SCN-REQ, the serving base station transmits a RESOURCE-RESERVE-REQ message to neighbor base stations(308,310). Each of the neighbor base stations, receiving the RESOURCE-RESERVE-REQ message, sends a RESOURCE-RESERVE-RSP message to the serving base station in case a radio resource corresponding to a specific band(mode) which can be used for the handoff of the mobile station exists(S314,316).
Abstract:
A handoff method in a mobile communication system is provided to minimize the degradation of QoS(Quality of Service) in handoff by estimating uplink/downlink channel information and using them for resource allocation of a mobile terminal in handoff. When a mobile terminal for which a session is maintained for uplink/downlink data transmission/reception(S302) moves to a cell boundary area, handoff is performed(S304). Channels of uplink/downlink between adjacent base stations and the mobile terminal are estimated(S306) and a base station that has the best channel state and resources which can receive the mobile terminal is determined as a target base station(S308). Resources that are most suitable for QoS of the mobile terminal are reserved(S310). The reserved resources are allocated to the mobile terminal and at the same time handoff is performed(S312).
Abstract:
본 발명은 이동 네트워크(Moving Network) 간 라우팅 방법 및 그 장치에 관한 것으로, 보다 상세하게는 근접한 이동 네트워크의 네트워크 프리픽스(Network Prefix)를 획득하여 홈 에이전트(Home Agent)를 통하지 않고 이동 네트워크 간에 라우팅을 수행하는 방법 및 장치에 관한 것이다. 이를 위해 본 발명은 RREQ(Route Request) 메시지나 네이버 디스커버리(Neighbor Discovery) 메시지 또는 이동 네트워크들의 협약(Association) 정보를 관리하는 장치를 이용하여 이동 네트워크 간의 라우팅 경로를 설정하고 데이터를 전송하는 것을 특징으로 한다. 이동 네트워크, 라우팅
Abstract:
본 발명은 무선랜의 서비스 영역과 유선랜의 서비스 영역을 이동하는 모바일 노드에서 핸드오버를 수행하는 방안을 제안한다. 이를 위해 본 발명의 모바일 노드는 무선랜의 서비스 영역에서 유선랜의 서비스 영역으로 이동할 경우 세미 소프트 핸드오버를 수행하며, 유선랜의 서비스 영역에서 무선랜의 서비스 영역으로 이동할 경우 소프트 핸드오버를 수행한다. 따라서, 모바일 노드는 송수신되는 데이터의 단절이 없이 무선랜 또는 유선랜과 통신을 수행할 수 있다.