Handover method and system across wireless network controllers

Abstract

Disclosed is a cross-radio network controller switching method, comprising: after a source access gateway (AG) receives a switching request of a source radio network controller (RNC), informing, through a session initiation protocol (SIP) message, a target AG to prepare resources for a to-be-switched user equipment (UE) (403); the target AG preparing the resources for the to-be-switched UE, establishing a bearer between the target AG and the source AG, and informing the source AG that the preparation for the switching is completed (407); and the source AG informing the to-be-switched UE to switch to a target network (408). Further disclosed is a cross-radio network controller switching system. In the present invention, the source AG performs the switching control, and the switching message does not pass through any integrated service control function (ISCF) entity, thereby simplifying the messaging flow of the switching service. In the present invention, a media stream after the switching is anchored at the source AG, thereby saving the procedure in the prior art that the ISCF performs session description protocol (SDP) negotiation with a target signaling gateway and a peer UE of the to-be-switched UE, further simplifying the messaging flow, and improving the switching efficiency.

Description

technical field [0001] The invention relates to handover technology, in particular to a handover method and system across wireless network controllers. Background technique [0002] From the perspective of the evolution and development of the telecommunication network, the development of the core network network architecture presents two major trends: one is the Internet Protocol (IP, Internet Protocol) of the network, and the other is that various networks tend to be integrated. Therefore, the future core network will no longer be divided into circuit switched (CS, Circuit Switched) domain, packet switched (PS, Packet Switching) domain and IP multimedia subsystem (IMS, IP Multimedia Subsystem) and other types, but will be a IP-based unified service control system, all services (including voice services, supplementary services and value-added services, etc.) are realized by this unified service control system. [0003] The IP-based unified service control system (hereinafte...

AI Technical Summary

Problems solved by technology

Updating the media plane of UE2 is to use the SDP of the target AG to negotiate with UE2 (step 315), which may cause UE2 to re-apply for a new port for communication with the handover terminal. At this time, the media plane information of UE2 will change. This will cause the SDP of UE2 previously negotiated by the target AG to be invalid, and the new media plane information of UE2 needs to be used to re-negotiate the media plane with the target AG, which leads to the handover oscillation problem.

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