VoLTE Terminal Network Domain Selection for Seamless Voice Continuity
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Solution Overview
Problem
In LTE mobile communication systems, voice calls often drop when a user moves from a VoLTE area to a non-VoLTE area, and there is a need to maintain seamless voice service while reducing battery power consumption and control load due to inaccurate measurement and handover processes.
Innovation Solution
A method and apparatus for a terminal to initiate a combined tracking area update request, assess network support for IMS VoPS, and selectively switch to GERAN or UTRAN networks based on network support information, while optimizing measurement processes by pre-calculating measurement parameters and reducing unnecessary measurements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal performs continuous measurement and handover procedures to maintain voice service continuity, then voice service reliability is improved, but battery power consumption increases
Solution Approach 1:
The terminal autonomously determines whether to perform measurement and handover procedures by checking network support information for SRVCC or PS handover in the target tracking area, rather than continuously measuring all possible handover targets. This self-service approach reduces unnecessary measurements and battery consumption while maintaining voice service continuity when available.
Solution Approach 2:
Instead of performing complete measurement procedures for all potential handover scenarios, the terminal performs only the necessary partial measurements based on network capabilities. When SRVCC or PS handover is supported, minimal measurements are performed; when not supported, the terminal avoids unnecessary measurements entirely, reducing power consumption while maintaining adequate service continuity.
2Measurement precision
If the terminal performs comprehensive measurement for handover decision, then handover accuracy is improved, but control load and processing complexity increase
Solution Approach 1:
The terminal performs preliminary checks of network support information for SRVCC or PS handover before initiating comprehensive measurement procedures. This preliminary action filters out scenarios where detailed measurements would be unnecessary, reducing control load and processing complexity while maintaining handover accuracy when network conditions permit.
Solution Approach 2:
The measurement process is segmented into conditional stages: first checking network support capabilities, then performing measurements only for supported handover types. This segmentation divides the complex measurement task into manageable parts, reducing overall control load while preserving measurement accuracy for relevant handover scenarios.
Data Source
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AI summary
Disclosed are a method and an apparatus for selecting a domain for a voice call in a mobile communication network. A terminal, which uses VoLTE, receives, from a network, identification information indicating whether IMS Voice over PS (IMS VoPS) is supported, determines whether the network supports IMS VoPS and determines a domain (PS or CS) to which a voice service will be provided through the network according to the determination result.