Fast return method, apparatus, and system for csfb user equipment

A fast return apparatus for CSFB user equipment, comprising:

• a receiver, configured to receive a trigger message from a mobile switching center (MSC), wherein the trigger message is used to trigger release of a CS service of CSFB user equipment (UE), and the UE runs both the CS service and a PS service;
• a processor, configured to generate an RRC connection release message according to the trigger message received by the receiver;
• and
• a transmitter, configured to send the RRC connection release message generated by the processor to the UE.

A fast return system for CSFB user equipment, comprising:

• a radio network controller (RNC);
• CSFB user equipment (UE);
• and
• a mobile switching center (MSC), wherein the UE runs both a CS service and a PS service;
• the MSC is configured to send a trigger message to the RNC, wherein the trigger message is used to trigger release of the CS service of the UE;
• the RNC is configured to receive the trigger message from the MSC, and send an RRC connection release message to the UE according to the trigger message;
• and
• the UE is configured to:
• receive the RRC connection release message from the RNC, release a radio bearer of the CS service, a radio bearer of the PS service, and an RRC connection according to the RRC connection release message, and fast return to an LTE network.