I1 Interface Service Control Reducing Message Overhead
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Solution Overview
Problem
The I1 protocol, used for IMS session control, generates significant message overhead due to its reliance on USSD or SMS, which affects traffic volume and requires optimization to minimize message overheads.
Innovation Solution
The method involves sending a Session Initiation Protocol Invite message through a Gm interface and, upon user equipment response, sending an I1 Invite message through the I1 interface, which carries information for associating the Gm interface control with I1 interface control, thereby omitting unnecessary headers and reducing message overheads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the I1 protocol uses USSD or SMS as the transmission protocol for IMS session control, then service control functionality is achieved, but message overhead increases significantly affecting traffic volume
Solution Approach 1:
The patent extracts and omits redundant header information (calling user identifier and called user identifier) from I1 protocol messages by utilizing the existing SIP dialog context, thereby reducing message overhead while maintaining service control functionality
Solution Approach 2:
The patent leverages the existing SIP dialog context and message association mechanisms to serve multiple purposes: both maintaining session state and reducing redundant information transmission in I1 protocol messages
2Loss of information
If the I1 protocol includes complete user identifiers and session information in each message, then message completeness is ensured, but message length and overhead increase
Solution Approach 1:
The patent performs preliminary establishment of SIP dialog context and message association before I1 protocol message exchange, enabling subsequent messages to reference this pre-established context rather than repeating complete information
Solution Approach 2:
Instead of including complete user identifiers and session information in each I1 message, the patent inverts the approach by using compact references (SIP dialog information) that point to the complete information stored in the dialog context
Data Source
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AI summary
Embodiments of the present invention disclose a method, an apparatus, and a system for service control via an I1 interface. The method includes: sending a Session Initiation Protocol Invite message to a user equipment through a Gm interface; if receiving a response message returned by the user equipment, where the response message indicates that the user equipment chooses to use a circuit switched bearer and use an I1 interface for control, sending an I1 Invite message to the user equipment through the I1 interface, where I1 Invite message carries information indicating that Gm interface control falls back to the I1 interface control and information used to associate the Session Initiation Protocol Invite message. With the technical solution, a replace header field of the I1 Invite message is used to carry information indicating that Gm interface control falls back to the I1 interface control and information used to associate the Session Initiation Protocol Invite message, so the calling and called user identifiers may be omitted, which reduces the overheads of the I1 protocol message.