IMS Registration Triggering for SIP Reliability

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Solution Overview

Problem

In IP multimedia subsystems (IMS), users may not register properly, leading to failed SIP requests and incomplete multimedia sessions due to unregistered users, which hinders the provision of new multimedia communication services.

Innovation Solution

A method and system for triggering IMS registration by sending an IMS registration triggering indication message to users who need registration, allowing them to initiate IMS registration based on the message, either from the network side or the user side, ensuring that users can register before starting an IMS session.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If users automatically register in IMS, then registration completeness improves, but network signaling overhead increases

Engineering Contradiction:

Improveregistration completenessVSAvoidnetwork signaling overhead

Core Design Contradiction:

ReliabilityVSQuantity of substance

Solution Approach 1:

The system performs preliminary registration actions by sending registration triggering indication messages to users before actual IMS registration is needed. This allows users to be pre-notified and prepared to register, ensuring registration completeness without requiring continuous polling or repeated signaling attempts.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

Users are empowered to self-initiate the registration process upon receiving the triggering indication message. Instead of the network forcing registration through repeated signaling, users autonomously complete registration when prompted, reducing network signaling overhead while maintaining high registration completeness.

Inventive Principle:

Principle #25Self-service

2Difficulty of detecting and measuring

If the system polls users for registration status, then registration status detection improves, but network traffic increases

Engineering Contradiction:

Improveregistration status detectionVSAvoidnetwork traffic

Core Design Contradiction:

Difficulty of detecting and measuringVSQuantity of substance

Solution Approach 1:

Instead of the network polling users to detect registration status, the system inverts the approach by having users proactively respond to registration triggering indication messages. This reversal eliminates the need for continuous polling traffic while maintaining effective detection of registration status through user responses to triggers.

Inventive Principle:

Principle #13The other way round (Inversion)

Solution Approach 2:

The system implements a feedback mechanism where users respond to registration triggering indication messages with their registration status. This feedback loop provides accurate registration status detection without requiring persistent polling, as users provide status information on-demand in response to network triggers.

Inventive Principle:

Principle #23Feedback

3Reliability

If IMS registration is mandatory before sessions, then session reliability improves, but user access flexibility decreases

Engineering Contradiction:

Improvesession reliabilityVSAvoiduser access flexibility

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The system performs preliminary registration triggering before IMS sessions are established by sending indication messages to users. This preliminary action ensures users are prompted to register in advance, guaranteeing session reliability while allowing users to complete registration at their convenience rather than forcing immediate registration.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The registration process becomes dynamic and adaptive through the triggering mechanism. Users can respond to registration triggers at different times based on their availability, making the registration process flexible. Meanwhile, the system ensures registration completion before sessions by controlling session initiation based on registration status, maintaining reliability without sacrificing user access flexibility.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS8666402B2Method for triggering user registration in IP multimedia subsystem

Publication Date: 2014.03.04 HUAWEI TECH CO LTD

AI summary

A method for triggering an IMS (IP Multimedia Subsystem) registration in the IMS, includes sending, by network side or a user who initiates the triggering, an IMS registration triggering indication message to a user who needs the IMS registration, to prompt the user who needs the IMS registration to initiate the IMS registration to the IMS; according to the IMS registration triggering indication message, trigging the user who needs the IMS registration to initiate the IMS registration to the IMS. Since the network side or the user who initiates the triggering triggers the IMS registration for the user who needs the IMS registration, the problem that the SIP messages may not be issued to the user who needs the IMS registration and the IMS session may not be performed because the user who needs the IMS registration does not register in the IMS during the IMS session, can be avoided.