Video Call Session Transition Between Cellular Networks
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Solution Overview
Problem
Wireless communication devices often experience dropped video calls during network transitions due to lack of inter-network session support, resulting in a negative user experience.
Innovation Solution
A wireless communication device proactively establishes a new video call session when transitioning between networks that do not support network-coordinated handover, ensuring a seamless continuation of the call without user intervention, by automatically initiating a new session on the new network.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If network-coordinated handover is used for video call session transition, then call continuity is maintained, but network compatibility is reduced
Solution Approach 1:
The device proactively establishes a new video call session on the target network before the handover is complete or as a fallback mechanism. This preliminary action ensures that when network-coordinated handover fails or is not supported, the call can be quickly reestablished without significant interruption, thus maintaining call continuity across different network types.
2Ease of operation
If proactive new session establishment is implemented, then user experience is improved, but device complexity increases
Solution Approach 1:
The device automatically monitors network conditions, detects handover opportunities or failures, and proactively establishes new sessions without user intervention. This self-service approach improves user experience by maintaining seamless call continuity while the complexity is contained within the device's automated protocols rather than requiring user awareness or action.
3Reliability
If automatic session reestablishment is performed, then call dropout is reduced, but signaling overhead increases
Solution Approach 1:
The device implements automatic session reestablishment as a partial fallback mechanism - not for every handover event, but specifically when network-coordinated handover is not supported or fails. This selective approach reduces call dropouts in critical scenarios while avoiding unnecessary signaling overhead in cases where standard handover procedures succeed.
Data Source
AI summary
A method for transitioning a video call is provided. The method can include a wireless communication device participating in a video call with a remote communication device via a first video call session established over a connection between the wireless communication device and a first cellular network. The video call can include a packet switched video stream carried over a first bearer and an audio stream carried over a second bearer. The method can further include the wireless communication device determining a degradation in a connection quality for the first cellular network; transitioning to a legacy cellular network having a circuit switched domain in response to the degradation in connection quality for the first cellular network; establishing a second video call session on the legacy cellular network; and using the second video call session to continue the video call on the legacy cellular network.