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    • 2. 发明授权
    • Inter-system calling supporting inter-system soft handoff
    • 系统间呼叫支持系统间切换
    • US5940762A
    • 1999-08-17
    • US649959
    • 1996-05-01
    • Kuo-Chun LeeGadi KarmiBibhu MohantyTodd R. SuttonNoam A. Ziv
    • Kuo-Chun LeeGadi KarmiBibhu MohantyTodd R. SuttonNoam A. Ziv
    • H04W36/14H04W36/18H04Q7/22
    • H04W36/0066H04W36/18H04W36/22
    • A method and apparatus for performing an inter-system soft handoff is described. In accordance with the present invention, when a subscriber unit crosses from a first cellular system to a second cellular system, a base station controller determines if sufficient network resources are available to conduct a inter-system soft handoff. If so, the base station controller generates a set of signaling messages that cause call processing resource to be allocated and for the call to be processed at the second cellular system. The base station controller then perform data-selection and data-broadcast for the call by transmitting data to the subscriber unit by way of the second cellular system as well as via one or more base stations to which the base station controller is directly coupled. The determination as to whether sufficient network resources are available to conduct the inter-system soft handoff is based on the type of connection that exists between the first cellular system and the second cellular system, the number of inter-system calls being conducted, and the frame offset of the call currently being processed.
    • 描述了用于执行系统间切换的方法和装置。 根据本发明,当用户单元从第一蜂窝系统交叉到第二蜂窝系统时,基站控制器确定足够的网络资源是否可用于进行系统间切换。 如果是,则基站控制器生成一组信令消息,这些信令消息使呼叫处理资源被分配,并且呼叫在第二蜂窝系统处被处理。 基站控制器然后通过第二蜂窝系统以及经由基站控制器直接耦合到的一个或多个基站向用户单元发送数据来执行呼叫的数据选择和数据广播。 关于足够的网络资源是否可用于进行系统间切换的确定是基于存在于第一蜂窝系统和第二蜂窝系统之间的连接类型,正在进行的系统间呼叫的数量,以及 正在处理的呼叫的帧偏移量。