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    • 11. 发明申请
    • METHODS AND APPARATUS FOR ENHANCING CIRCUIT-SWITCHED CALL FALLBACK (CSFB) SERVICE FOR A SHARED NETWORK NODE
    • 用于增强共享网络节点的电路交换呼叫退避(CSFB)服务的方法和设备
    • WO2013129994A3
    • 2013-10-31
    • PCT/SE2013050142
    • 2013-02-20
    • ERICSSON TELEFON AB L M
    • DIACHINA JOHN WALTEROLSSON MAGNUSSCHLIWA-BERTLING PAUL
    • H04W36/04H04W36/10
    • H04W36/0022
    • Methods and apparatus enhance a circuit-switched call fallback (CSFB) service for a user equipment (UE) currently connected to a source cell in a serving radio access technology (RAT) communications network. Multiple different mobile network operators share a target CSFB cell selected for CSFB from one or more circuit-switched capable cells that supports circuit-switched services. Each mobile network operator is associated with a corresponding mobile network identifier. The UE transmits a first message requesting a CSFB service to a source cell radio network node serving the source cell. The source node, in response to the first message, sends a second message to the UE including preferred mobile network identifier information and a target CSFB cell identifier. The UE transmits a third message to a target cell node serving the target CSFB cell to trigger the establishment of a circuit-switched call connection for the UE in the target CSFB cell. The target cell radio network node receives the third message, which includes preferred mobile network information to permit the target node to direct the third message to a core network node operated by one of the mobile network operators identifiable based on the preferred mobile network information. That core network node then initiates the requested CSFB service for the UE. Based on the preferred mobile network identifier information, the UE determines whether a location area update procedure must be performed in the target CSFB cell, and if so, transmits a fourth message to trigger the location area update procedure prior to triggering the establishment of a circuit-switched call connection.
    • 方法和装置增强了当前连接到服务无线电接入技术(RAT)通信网络中的源小区的用户设备(UE)的电路交换呼叫回退(CSFB)服务。 多个不同的移动网络运营商从支持电路交换服务的一个或多个具有电路交换能力的小区共享为CSFB选择的目标CSFB小区。 每个移动网络运营商都与相应的移动网络标识符相关联。 UE向服务源小区的源小区无线电网络节点发送请求CSFB服务的第一消息。 源节点响应于第一消息向UE发送包括优选移动网络标识符信息和目标CSFB小区标识符的第二消息。 UE向服务于目标CSFB小区的目标小区节点发送第三消息,以触发在目标CSFB小区中为UE建立电路交换呼叫连接。 目标小区无线电网络节点接收包括优选移动网络信息的第三消息,以允许目标节点将第三消息引导至由可基于优选移动网络信息识别的移动网络运营商之一操作的核心网络节点。 该核心网络节点然后为UE发起所请求的CSFB服务。 基于优选移动网络标识符信息,UE确定是否必须在目标CSFB小区中执行位置区域更新过程,并且如果是,则在触发建立电路之前发送第四消息以触发位置区域更新过程 - 切换呼叫连接。