Switching method and system for heterogenous access systems

Abstract

The invention discloses a handoff method among heterogeneous access systems. The method comprises: when an user equipment (UE) performs handoff among heterogeneous access systems, UE obtains an internet access system anchor (IASA) address from an original access system and is accessed to IASA connected with UE in the original access system through a target access system. The invention can search IASA, HA or VPN GW in the target access system without DNS resolution process, so as to reduce UE handoff time. Furthermore, the invention can ensure the UE keeps consistence of the service anchor in the original system and target access system, so that UE can interact with external network using the same IP address, hence reducing service interruption and ensuring service continuity.

Description

technical field [0001] The invention relates to mobile communication technology, in particular to a handover method and a handover system between heterogeneous access systems. Background technique [0002] In order to enhance the competitiveness of future mobile networks, the 3rd Generation Partnership Project (3GPP, The3rd Generation Partnership Project) has locked its main development direction in the next stage on the evolutionary system architecture (SAE, System Architecture Evolution) of multi-network convergence. see figure 1 As shown in the SAE network architecture diagram, users can access the Evolved Packet Core network (Evolved Packet Core) through the 3GPP access system, or access the Evolved Packet Core network through the non-3GPP (non 3GPP) access system. Wherein, the 3GPP access system is the General Packet Radio Service System GPRS, or the Universal Mobile Telephone System UMTS, or the Evolved System Architecture SAE, etc.; the non-3GPP access system is the ...

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Problems solved by technology

[0006] However, when the UE moves between heterogeneous access systems, such as switching from a 3GPP access system to a non-3GPP access system, or from a non-3GPP access system to a 3GPP access system, due to the MME / UPE and non-3GPP GW Therefore, when selecting IASA, it is necessary to re-perform the domain name system (DNS, Domain Name System) resolution process, which will easily increase the UE handover time, and, since the UE is handing over to a new access system It may be anchored on a different IASA, so for a UE with ongoing services, that is, a service-active UE, it is easy to cause service interruption

For example, when a UE in the service activation state switches from a non-3GPP access system to a 3GPP access system, the UE needs to re-activate the PDP Context in the 3GPP access system. When the UE activates the PDP Context in the 3GPP access system, the MME / The UPE performs DNS resolution on the access point name (APN, Access Point Name) provided by the UE, and selects a result as the IASA of this service. This mechanism cannot guarantee that the selected IASA is the service performed by the UE in the non-3GPP access system. The IASA used at the time, and the difference in IASA will cause the interruption of the ongoing service of the UE

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