METHOD, DEVICE, AND SYSTEM FOR NETWORK HANDOVER

摘要

The present invention discloses a network handover method. After receiving a request message that requests circuit switched fallback CSFB and is initiated by a UE located in an LTE network, an MME instructs an eNB to move the UE from the LTE network to a 2G or 3G network, requests an MSC to hand over the UE from the LTE network to a CS domain of the 2G or 3G network; and requests an SGSN to initiate a handover from the LTE network to a packet switched PS domain of the 2G or 3G network; the MME sends a handover requirement response message to the eNB, where the handover requirement response message includes the PS domain RAB, so that the PS domain RAB is sent by the eNB to the UE. Therefore, the UE can be handed over to the PS domain of the 2G or 3G network in a manner of being handed over from the LTE network to the CS domain of the 2G or 3G network. After being handed over to the PS domain, the UE can make a CS domain call, which can shorten a time of a voice call connection.