Abstract:
본 발명은 서비스 품질에 대한 요구가 상이한 음성, 멀티미디어, 및 패킷데이터 등의 서비스가 공존하는 광대역 코드분할다중접속(Wideband Code Division Multiple Access, W-CDMA) 시스템에서의 역방향 무선링크 자원관리방법에 관한 것이다. 광대역 코드분할다중접속 시스템은 음성, 멀티미디어, 및 패킷데이터 등의 다양한 서비스들을 제공한다. 이들 서비스들은 오류율과 데이터 전송율 등의 서비스 품질에 대한 요구사항이 서로 상이하다. 높은 전송율과 낮은 오류율을 요구하는 서비스의 경우 많은 전송 전력을 필요로 하며, 이러한 서비스가 활성화된 단말이 셀 경계 지역으로 이동하면 다른 셀 내 사용자들에 대한 간섭을 증가시켜 진행 중인 서비스의 손실 및 통화품질 악화를 발생시킨다. 본 발명에서는 이러한 환경에서 효율적으로 역방향 무선링크 자원을 관리할 수 있는 기술을 제안한다. 본 발명은 비동기 IMT-2000 시스템에서의 역방향 무선링크 자원관리방법으로 적용할 수 있다.
Abstract:
PURPOSE: A method for controlling call admission and managing wireless link resources in a W-CDMA(Wideband CDMA) system is provided to reduce a call loss rate, to efficiently control call admission for a reverse wireless link, and to manage wireless resources by calculating the residual power value of a cell using path loss information that a terminal reports in call setup and on call proceeding. CONSTITUTION: In case that a home cell receives a terminal origination or destination service activation request(S401), the home cell obtains the value of power to be received to a base station from a terminal(S402). The home cell confirms whether the power to be received to the base station exceeds its own residual power(S403). In case that the power to be received to the base station does not exceed the residual power, the home cell confirms whether the power to be received to the base station exceeds the residual power of each neighboring cell(S404). If the power to be received to the base station does not exceed the residual power of every neighboring cell, the service activation request is accepted. Accordingly the home cell allocates a wireless resource(S405) and transfers it to the terminal(S407).
Abstract:
PURPOSE: A method for a hard handoff to a synchronous CDMA system from an asynchronous CDMA system is provided to execute a handoff at an appointed time after receiving all necessary information to set up a traffic channel with a synchronous CDMA(second generation IS95) base station in the state that the connection with an asynchronous CDMA(third generation 3GPP DS) base station has not released. CONSTITUTION: Based on a received signal strength indicator and base station discriminating information reported from a mobile terminal, a third generation 3GPP DS base station judges that a handoff to a second generation IS95 base station is required. If the 3rd generation 3GPP DA base station informs a mobile switching center that the handoff to the 2nd generation IS95 base station is required(Handoff Required), the mobile switching center sends a handoff request message to inform the 2nd generation IS95 base station that the handoff is required(Handoff Request). The 2nd generation IS95 base station transfers information, necessary for the mobile terminal to execute the hard handoff to the 2nd generation IS95 base station, to the generation 3GPP DA base station(Handoff Request ACK, Handoff Command). The generation 3GPP DA base station transfers information delivered from the 2nd generation IS95 base station to the mobile terminal through a preset signaling channel(Inter-System Handoff Command). If the mobile station receives the inter-system handoff command message normally and informs the 3rd generation 3GPP DA base station of the fact(L2:Data Ack), the 3rd generation 3GPP DA base station sends a handoff execution message to the mobile switching center(Handoff Commenced).