Method and apparatus for accessing old network through temporary id of evloved network

Abstract

A method for accessing an old network through a temporary ID of an evolved network includes these steps: a User Equipment (UE) adds Mobility Management Entity (MME) information for uniquely identifying an MME accessed by the UE on an evolved network to an access message sent to an old network when the UE accesses the old network through a temporary ID of the evolved network; and the old network selects a corresponding Serving GPRS Support Node (SGSN) for the UE according to the access message. After the MME information for uniquely identifying an MME is added to the access message sent to the old network, the old network can determine and find the MME that is accessed by the UE in the evolved network without changing a Radio Network Controller (RNC) and an SGSN on the old network. In addition, with the method for accessing the evolved network through a temporary ID of the old network, a combined SGSN / MME can be accessed to prevent unnecessary node relocation.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a continuation of International Application No. PCT / CN2008 / 072864, filed on Oct. 28, 2008, which claims priority to Chinese Patent Application No. 200710166066.8, filed on Nov. 1, 2007 and Chinese Patent Application No. 200810091433.7, filed on Apr. 11, 2008, all of which are hereby incorporated by reference in their entireties.FIELD OF THE INVENTION[0002]The present invention relates to mobile communication technologies, and in particular, to a method and apparatus for accessing an old network through a temporary ID of an evolved network.BACKGROUND OF THE INVENTION[0003]A Universal Mobile Telecommunication System (UMTS) is a 3G wireless communication network standard defined by the Third Generation Partnership Project (3GPP). A UMTS network consists of a Core Network (CN) and an Access Network (AN). The CN consists of a Circuit Switched (CS) domain and a Packet Switched (PS) domain. The CS domain provides CS-based ser...

AI Technical Summary

Benefits of technology

[0025]The technical solution in embodiments of the invention has the following advantage:

[0026]when a UE moves from an evolved network to an old network, MME information for uniquely identifying an MME is added to an access message sent to the old network; therefore, the old network can determine and find the MME that is accessed by the UE in the evolved network without changing the RNC and SGSN on the old network.

Problems solved by technology

Thus, problems such as single point failure exist.

If an SGSN is down, a UE in the service area of the SGSN cannot access the network, and thus cannot perform communications.

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