SRVCC Capability Update for Voice Call Continuity
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Solution Overview
Problem
Current SRVCC scenarios experience voice transmission interruptions when users move from 4G to 2G/3G networks during voice calls, due to the inability to dynamically update SRVCC capabilities in real-time, leading to potential call drops.
Innovation Solution
A method that determines when a terminal's SRVCC capability changes and sends information to the base station to update local SRVCC capability information, ensuring the base station can initiate an SRVCC process correctly, maintaining voice call continuity by switching the terminal's state as needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the base station uses static SRVCC capability information, then the device complexity is reduced, but the reliability of voice transmission deteriorates due to call drops during network switching
Solution Approach 1:
The patent transforms the static SRVCC capability information into dynamic information that can be updated in real-time. The MME sends updated SRVCC capability information to the base station when capability changes occur, allowing the base station to adapt its handover decisions based on current terminal capabilities, thereby maintaining voice transmission reliability without excessive complexity
Solution Approach 2:
The patent implements a feedback mechanism where the MME monitors terminal SRVCC capability changes and provides feedback to the base station. When the MME detects that a terminal's SRVCC capability has changed, it sends an update message to the base station, ensuring the base station always has accurate capability information for making handover decisions
2Reliability
If the system implements real-time SRVCC capability updates, then the reliability of voice transmission is improved, but the loss of information increases due to potential capability change detection failures
Solution Approach 1:
The patent applies preliminary action by having the terminal proactively indicate its SRVCC capability status to the network. The terminal includes its SRVCC capability information in initial attachment requests and updates this information when changes occur, allowing the network to anticipate capability changes before they cause transmission interruptions
Solution Approach 2:
The patent implements bidirectional feedback where both the terminal and MME monitor capability changes. The terminal provides feedback to the MME about its capability status, and the MME subsequently provides feedback to the base station, creating a redundant information verification mechanism that reduces information loss
3Adaptability or versatility
If the MME sends capability update information to the base station, then the adaptability of the system is improved, but the productivity decreases due to additional signaling overhead
Solution Approach 1:
The patent applies partial action by having the MME send capability update information to the base station only when actual capability changes are detected, rather than sending continuous updates. This selective updating approach maintains system adaptability while minimizing unnecessary signaling overhead that would reduce network productivity
Solution Approach 2:
The patent uses parameter changes as a trigger mechanism - when the terminal's SRVCC capability parameter changes, this change is detected and triggers a targeted information update to the base station. This event-driven approach ensures the system adapts to capability changes while maintaining signaling efficiency by avoiding unnecessary updates
Data Source
AI summary
The present invention relates to the field of mobile communications technologies, and in particular, to an information transmission method, an information modification method, and apparatuses, so as to solve a technical problem of voice transmission interruption in an SRVCC scenario in the prior art. In embodiments of the present invention, when a UE is in a connected state, a base station is notified of an SRVCC capability of the UE in real time, so that the base station can update the locally stored SRVCC capability of the UE in real time, and then determine, according to an actual situation, whether to initiate an SRVCC process, thereby ensuring a success rate of the SRVCC process and avoiding a possible phenomenon of call drop as far as possible.