METHOD, DEVICE AND SYSTEM FOR SERVICE CONTROL OF I1 INTERFACE

摘要

A method, a device and a system for service control of an I1 interface are provided, wherein the method includes: transmitting a Session Initiation Protocol (SIP) invite message to a User Equipment (UE) through a Gm interface; if a response message returned from the UE is received, wherein the response message indicates that the UE selects to use a Circuit Switched (CS) bearer and use I1 interface control, transmitting an I1 invite message to the UE through the I1 interface, wherein the I1 invite message carries the information which indicates that the Gm interface control falls back to the I1 interface control and the information used to associate with the SIP invite message. The solution can omit the user identifiers of the calling and called and reduce the cost of the I1 protocol message through using the replacement header field of the I1 invite message to carry the information which indicates that the Gm interface control falls back to the I1 interface control and the information used to associate with the SIP invite message.