Method and device for handover to serving network

摘要

The present invention discloses a method and a device for handover to a serving network. The method includes: receiving a first Handover Request sent by a BSC/RNC; sending a second Handover Request to a target MME according to the first Handover Request, where the second Handover Request includes an IMSI and first information for determining a source SGSN so that the MME sends a Context Request message including the IMSI to the source SGSN and receives context information of a UE that corresponds to the IMSI and is sent by the source SGSN. Thereby avoiding a handover failure which is caused because the MSC server and the SGSN select different MMEs, and further synchronizing PS and CS handover processes, improving handover accuracy and efficiency, and enhancing user experience.

主权项

1. A method for handover from a circuit switched (CS) 2G/3G network to a packet switched (PS) long term evolution (LTE)/high speed access (HSPA) network, comprising:
receiving a first Handover Request for a user equipment (UE) sent by one of a base station controller (BSC) and a radio network controller (RNC), when the PS LTE/HSPA network supports a PS handover and a CS handover, and the UE is in a dual transfer mode, wherein the first handover request is a message for requesting a handover sent by one of the BSC and the RNC and no other message for requesting a handover is sent by one of the BSC and the RNC; and sending a second Handover Request to a target mobility management entity (MME) according to the first Handover Request, wherein the second Handover Request comprises an international mobile subscriber identity (IMSI) and first information for determining a source serving General Packet Radio Service (GPRS) support node (SGSN), the second handover request is configured to indicate the target MME to send a Context Request message comprising the IMSI to the source SGSN and receives context information of the UE that is associated with the IMSI and is sent by the source SGSN; receiving a Handover Notify message sent by a base station; and sending a notification message for notifying handover completion to the source SGSN according to the Handover Notify message, wherein a timer is started by RNC when the RNC sends the first Handover Request, and after sending a notification message, if the timer expires, releasing a related PS source, and if the timer does not expire, waiting to release the related PS resource until the timer expires.