Method and device for switching between systems

Abstract

The embodiment of the invention provides a method and device for intersystem handover. The method mainly comprises: an access gateway of a Non-3GPP system receives information, carrying an intersystem handover indication and an APN where user equipment (UE) is connected in an original 3GPP system, sent by the UE in a 3GPP system, and stores the intersystem handover indication and the APN where the user equipment (UE) is connected in the original 3GPP system; and after the access gateway of the Non-3GPP system receives attachment request information sent by the UE, the access gateway of the Non-3GPP system, based on the intersystem handover indication and the APN, selects a packet data network gateway of the APN for the UE, and allocates an IP address for the UE, wherein the IP address is the same with an IP address used in the original 3GPP system by the UE. Through the method and device for the intersystem handover, when the UE is switched from the 3GPP system to the Non-3GPP system, the PDN GW selected by the access gateway of the Non-3GPP system for the UE can be guaranteed to be the same with the PDN GW that is originally connected by the UE, the IP address allocated to the UE can be guaranteed to be the same with the original IP address, and the service that the UE is carrying out is not interrupted.

Description

technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a method and device for handover between systems. Background technique [0002] 3GPP (3rd Generation Partnership Project, third generation partnership project) LTE (Long Term Evolution, long-term evolution) core network is EPS (Evolved Packet System, evolved packet system), EPS consists of S-GW (Serving Gateway, serving gateway) , P-GW (PDN Gateway, packet data network gateway), HSS (Home Subscriber Server, home user server), 3GPP AAA (Authentication, Authorization and Accounting, authentication authorization accounting server), PCRF (Policy and Charging Rules Function, policy and accounting fee rule function) and other supporting nodes. [0003] The Trusted Non-3GPP IP Access (trusted non-3GPP IP access) network may be a WLAN (Wireless LAN, wireless local area network). [0004] As a next-generation evolved wireless network, LTE can meet the growing dema...

AI Technical Summary

Problems solved by technology

[0005] When the UE (User Equipment, user equipment) accesses the EPS through the 3GPP access network, if the UE is performing data services, the UE switches from the 3G PP network to the non-3G PP network at this time, and the non-3G PP access gateway cannot obtain The non-3G PP access gateway will think that this is a new attachment to the original UE's 3G PP side data connection information, and reassign a PDN GW (PacketData Network Gateway, packet data network gateway) and a new IP address to UE , resulting in interruption of the ongoing service of the UE

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