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    • 7. 发明申请
    • CIRCUIT SWITCHED FALLBACK FOR MOBILE TERMINATED CALLS
    • 用于移动终端呼叫的电路切换倒带
    • WO2009095777A1
    • 2009-08-06
    • PCT/IB2009/000163
    • 2009-01-30
    • TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)VIKBERG, Jari, TapioDIACHINA, John, WalterOLSSON, MagnusÖSTRUP, Peter
    • VIKBERG, Jari, TapioDIACHINA, John, WalterOLSSON, MagnusÖSTRUP, Peter
    • H04W76/02H04W36/14H04W68/12
    • H04W68/12H04W36/0022
    • In order to prevent a mobile terminated (MT) call to a user equipment (UE) from being lost by addressing a Location Area/Tracking Area (LA/TA) mismatch problem that could occur during a circuit switched (CS) Fallback, the method comprises the steps of : receiving a paging message from a mobility management entity, MME, where the paging message identifies suitable location areas, the paging message is sent because a first mobile switching center, MSCl, received a MT call request for the UE; determining that there are no 2G/3G cells belonging to the suitable location areas based on a current location of the UE; identifying a target 2G/3G cell in a location area associated with the cuttent location of the UE but not part of the 2G/3G cells belonging to the suitable location areas; and enabling a signaling connection to be established between the UE and the first MSCl via a second mobile switching center, MSC2, where the second MSC2 interfaces with a base station controller, BSC2, or a radio network controller, RNC2, that manages the target 2G/3G cell, where the signaling connection allows the MT call to be established with the UE.
    • 为了防止通过寻址可能在电路交换(CS)回退期间发生的位置区域/跟踪区域(LA / TA)不匹配问题来阻止对用户设备(UE)的移动终止(MT)呼叫丢失,该方法 包括以下步骤:从移动性管理实体MME接收寻呼消息,其中寻呼消息识别合适的位置区域,由于第一移动交换中心MSC1接收到对该UE的MT呼叫请求,所以寻呼消息被发送; 基于UE的当前位置确定不存在属于合适位置区域的2G / 3G小区; 在与UE的切入点相关联的位置区域中识别目标2G / 3G小区,而不是属于合适位置区域的2G / 3G小区的一部分; 并且经由第二移动交换中心MSC2在UE和第一MSC1之间建立信令连接,其中第二MSC2与管理目标2G的基站控制器,BSC2或无线电网络控制器RNC2进行接口 / 3G小区,其中信令连接允许与UE建立MT呼叫。