Proactive Voice Switching for Seamless LTE Handover
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Solution Overview
Problem
The existing SR-VCC handover technology in LTE networks often results in poor voice service quality or interruptions due to sudden changes in channel quality, particularly in areas like elevators or subways, leading to user experience issues.
Innovation Solution
A method and apparatus that determine voice service quality along a UE's movement path and trigger a switch from IMS to CS domain voice communication mode before arriving at a position with poor quality, using preset conditions and control commands from an application server to prevent service disruptions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional SR-VCC handover is used, then voice service switching between LTE and 2G/3G networks is achieved, but voice service quality deteriorates due to sudden channel quality changes in areas like elevators and subways
Solution Approach 1:
The system performs preliminary actions by determining voice service quality at multiple positions along the UE's movement path before the UE actually reaches poor coverage areas. When quality degradation is predicted at future positions, the system proactively triggers handover before the UE enters the problematic area, preventing service quality deterioration rather than reacting after degradation occurs.
Solution Approach 2:
The movement path of the UE is segmented into multiple discrete positions for individual quality assessment. Instead of treating the movement path as a continuous whole, the system divides it into separate evaluation points, allowing targeted handover decisions at specific locations where quality degradation is predicted, thereby improving overall service reliability.
2Productivity
If handover decision is made after obtaining radio channel measurement report, then switching between voice communication modes is achieved, but service quality has already deteriorated or service has been interrupted
Solution Approach 1:
The system performs quality determination at multiple positions along the movement path in advance, before the UE reaches areas with poor voice service quality. This preliminary assessment allows the system to trigger handover proactively before quality degradation occurs, rather than waiting for measurement reports that indicate deterioration has already happened.
Solution Approach 2:
Instead of waiting for the UE to reach a position and then making a handover decision based on current measurements, the system inverts the approach by predicting future quality conditions at multiple positions along the movement path and making handover decisions based on these predictions, thereby acting before quality degradation occurs.
3Reliability
If normal SR-VCC process is used, then voice service switching is completed, but the process cannot be completed in short time, leading to poor user experience
Solution Approach 1:
The system performs preliminary quality assessments at multiple positions along the UE's movement path, identifying optimal handover points in advance. By determining voice service quality at future positions before the UE reaches them, the system can trigger handover at the most appropriate moment, reducing unnecessary delays while ensuring service continuity.
Solution Approach 2:
The system uses feedback from quality determination results at multiple positions to dynamically adjust handover timing decisions. By continuously monitoring predicted quality conditions along the movement path and comparing them against handover completion time requirements, the system optimizes the balance between service continuity and handover speed.
Data Source
AI summary
Embodiments of the present application disclose a switching method and a switching apparatus. The method comprises: determining voice service quality of at least one position in a movement path of at least one UE; determining a position of the at least one UE; and triggering, in response to that the voice service quality of the at least one position meets a preset condition, and the at least one UE fails to arrive at the at least one position corresponding to the voice service quality that meets the preset condition, the at least one UE to switch from a first voice communication mode to a second voice communication mode. In the method and apparatus of the embodiments of the present application, switching is triggered, by determining a movement path and a position of a UE, in advance before the UE arrives at a position/position range at which the switching of a voice communication mode should be performed, so as to avoid relatively poor communication quality or even an interrupted communication service caused by a state that a normal switching process cannot be completed in a short time, thereby improving user experiences.