Method and system for enabling circuit switched fallback service in evolved packet system

Abstract

The present document discloses a method and system for enabling a Circuit Switched Fallback (CSFB) service in an Evolved Packet System (EPS). The method may include, after accessing an EPS network, the User Equipment (UE) triggering the CSFB service when it executes the Circuit Switching (CS) network service, and the UE transmitting a CS network service request carrying a CSFB indication to a Mobility Management Entity (MME). The method may also include, after receiving the CS network service request carrying the CSFB indication transmitted by the UE, the MME indicating an Evolved Universal Mobile Telecommunication System Radio Access Network (E-UTRAN) to switch the UE to the CS network, and the E-UTRAN initiating the switching to switch the UE to the CS network through an MME and the Mobile Switching Center (MSC) with which the UE jointly registers when accessing the EPS network.

Dependencies are inferred from the claim text.