| 摘要 |
A Mobile Switching Centre, MSC, an Access Transfer Control Function, ATCF, an Access Transfer Gateway, ATGW and respective methods therein are provided for performing a packet-switched, PS, to circuit-switched, CS, handover of a User Equipment, UE, are provided. When the UE is handed over from a PS communication network to a CS communication network, the MSC requests the ATCF controlling the ATGW to bi-casting to both the CS communication network and the PS communication network, and forwarding speech data from the UE to a remote terminal with which the UE is communicating during the PS to CS handover procedure. Once the UE is handed over, the bi-casting and the forwarding are terminated. |
| 主权项 |
1. A method performed by a Mobile Switching Centre, MSC, operable to be comprised in a circuit-switched communication network for performing a packet-switched to circuit-switched handover of a User Equipment, UE, from a packet-switched communication network to the MSC, the method comprising:
receiving, from a Mobility Management Entity, MME, a request for handover of the UE, transmitting, to an anchor node in an IP Multimedia Subsystem, IMS, a request to start bi-casting to both the circuit-switched communication network and the packet-switched communication network and to start forwarding speech data from the UE to a remote terminal with which the UE is communicating in response to the received handover request, the anchor node in the IMS comprising an Access Transfer Control Function, ATCF, transmitting a relocation request to a target Radio Access Network, RAN, receiving, from the target RAN, a relocation complete message, and transmitting, to the anchor node in the IP Multimedia Subsystem, IMS, a request to stop bi-casting to both the circuit-switched communication network and the packet-switched communication network and to stop forwarding speech data from the UE to the remote terminal with which the UE is communicating in response to the received relocation complete message. |
