UE Mobile Continuity Manager for VoPS Call Maintenance
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Solution Overview
Problem
Existing 3GPP standards cause unnecessary session interruptions and user dissatisfaction by instructing UEs to drop calls or multimedia sessions due to changes in voice service indicators (VSIs) or registration updates, even when sufficient radio resources are available.
Innovation Solution
Implementing a mobile continuity manager in the UE that monitors VSI changes and postpones the release of bearers until normal or abnormal release occurs, allowing ongoing sessions to continue despite VSI changes, registration updates, or network rejections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the UE follows existing 3GPP standards and releases bearers upon VSI changes or registration updates, then the network protocol compliance is maintained, but unnecessary call drops occur and session continuity is interrupted
Solution Approach 1:
The patent applies dynamics by making the bearer release behavior adaptive rather than static. The UE dynamically adjusts its bearer management based on session state: when a conversational session is active, the UE suppresses automatic bearer release despite VSI changes or registration updates. When no session is active, the UE follows standard procedures. This dynamic adaptation resolves the contradiction by maintaining call continuity during active sessions while preserving protocol compliance during idle states.
Solution Approach 2:
The patent implements feedback by continuously monitoring the session state and using this information to control bearer release decisions. The UE checks whether a conversational session is currently active before processing VSI changes or registration updates. This feedback mechanism prevents unnecessary bearer releases that would interrupt ongoing calls, while still allowing standard bearer management when no session is present, thus resolving the contradiction between reliability and protocol compliance.
2Reliability
If the UE maintains bearers despite VSI changes, then session continuity is improved, but radio resources may be wasted when services are no longer supported
Solution Approach 1:
The patent uses dynamics to make bearer maintenance conditional rather than permanent. Bearers are maintained only during the duration of an active conversational session. Once the session ends, the UE resumes standard bearer management behavior, allowing bearers to be released when VSIs indicate service unavailability. This dynamic approach ensures session continuity during active calls while preventing long-term resource waste when services are not supported.
Solution Approach 2:
The patent applies continuity of useful action by maintaining bearers only as long as they serve a useful purpose - i.e., during active conversational sessions. The bearer maintenance is continuously evaluated against session state, ensuring that resources remain allocated only when needed for active communication. This prevents indefinite resource holding while ensuring uninterrupted service during actual usage periods.
3Ease of operation
If the UE automatically releases bearers upon receiving network rejection or registration update, then network protocol compliance is maintained, but user experience deteriorates due to call drops
Solution Approach 1:
The patent applies preliminary action by proactively checking session state before processing network rejections or registration updates that would trigger bearer release. The UE prepares to suppress automatic bearer release if a conversational session is detected, preventing call drops before they occur. This preliminary check improves user experience by maintaining calls during transient network events while adding minimal monitoring complexity.
4Reliability
If the UE monitors and evaluates session state before bearer release, then call continuity is maintained, but processing overhead increases
Solution Approach 1:
The patent uses feedback efficiently by leveraging existing session state information that is already maintained for other purposes. Rather than creating new monitoring mechanisms, the UE utilizes its existing session management state to control bearer release behavior. This feedback approach maintains call continuity through simple state checks rather than complex continuous monitoring, preserving processing efficiency while achieving reliability improvement.
Data Source
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AI summary
A method in a user equipment, UE (102), the method comprising while the UE (102) is participating in an ongoing voice or multi-media session using packet switched, PS, bearers, the ongoing voice or multi-media session comprising an Internet Protocol multimedia subsystem, IMS, voice over packet switched, VoPS, session, the user equipment sends a registration update request in response to the UE (102) being handed over to or entering a new tracking area, TA. The user equipment receives acceptance of the registration update request with a result indication of a particular type indicating that IMS VoPS sessions are not supported. In response to receiving the acceptance of the request, the user equipment postpones release of the ongoing voice or multi-media session until after the PS bearers are released normally, abnormally or otherwise subsequently.