SRVCC Handover Indication for Voice Call Continuity
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Solution Overview
Problem
Current wireless communication systems do not provide advance notification of Single Radio Voice Call Continuity (SRVCC) handovers to devices participating in voice calls, leading to potential interruptions in voice packets during the handover process, which negatively impacts user experience.
Innovation Solution
A first device participating in a voice call determines conditions indicative of an impending SRVCC handover and sends an advance notification to a second device, allowing it to adapt its de-jitter buffer configuration to minimize disruptions during the handover.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a device performs SRVCC handover from PS domain to CS domain during a voice call, then voice call continuity is maintained across network coverage boundaries, but the remote device experiences voice packet interruptions lasting up to 300 milliseconds
Solution Approach 1:
The local device performs preliminary action by detecting SRVCC handover conditions and sending advance notification to the remote device before the handover actually occurs. This allows the remote device to prepare by adjusting its de-jitter buffer configuration in advance, thereby reducing the impact of voice packet interruptions during the handover process.
Solution Approach 2:
The system implements feedback by having the local device monitor network conditions and SRVCC handover status, then communicate this information back to the remote device. This feedback loop enables the remote device to adapt its audio processing parameters dynamically based on the actual handover state, minimizing audio disruptions.
2Object-affected harmful factors
If the remote device adapts its de-jitter buffer configuration in response to SRVCC handover indication, then audio continuity is improved during handover, but device complexity increases
Solution Approach 1:
The remote device performs self-service by automatically adjusting its own de-jitter buffer configuration in response to receiving the SRVCC handover indication from the local device. This self-adjustment capability improves audio continuity during handover without requiring complex external control systems or additional network infrastructure.
3Productivity
If SRVCC handover is performed without advance notification to the remote device, then the handover procedure remains simple and fast on the network side, but user experience deteriorates due to audio interruptions
Solution Approach 1:
The local device acts as an intermediary by receiving SRVCC handover indications from the network and relaying this information to the remote device. This intermediary role enables the remote device to prepare for the handover without requiring the network to implement complex notification mechanisms, thus maintaining handover execution speed while improving user experience.
Data Source
AI summary
A method for providing indication of an SRVCC handover is disclosed. The method can include a first wireless communication device participating in a voice call with a second wireless communication device via a connection between the first wireless communication device and a first network. The method can further include the first wireless communication device determining a condition indicative of an impending SRVCC handover of the first wireless communication device from the first network to a legacy network. In response to the condition, the method can additionally include the first wireless communication device formatting a message including an indication that the first wireless communication device is going to perform the SRVCC handover and sending the message to the second wireless communication device prior to performance of the SRVCC handover.