Video Call Stream Offloading to WLAN
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Solution Overview
Problem
Video calls over cellular networks are data-intensive and costly, with existing techniques for offloading to WLANs often resulting in call interruptions or drops, making it difficult to seamlessly transition video streams without affecting audio quality.
Innovation Solution
Offloading the video stream from a cellular network to a WLAN while keeping the audio stream on the cellular network, allowing for reduced data costs and guaranteed audio quality by establishing a parallel video stream on the WLAN and terminating the cellular video stream without interrupting the call.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If video call is performed over cellular network, then audio quality is guaranteed, but data costs increase and network load increases
Solution Approach 1:
The video call is segmented into separate audio and video streams that can be transmitted over different networks simultaneously. The audio stream remains on the cellular network to guarantee quality, while the video stream is offloaded to WLAN to reduce data costs. This segmentation allows each stream to utilize the most appropriate network for its specific requirements.
Solution Approach 2:
The video stream is extracted from the cellular network connection and transferred to the WLAN connection. This extraction removes the data-intensive video portion from the cellular network, reducing data costs and network load, while the audio stream remains on the cellular network to maintain guaranteed quality of service.
2Loss of energy
If video call is offloaded to WLAN, then data costs are reduced, but call interruptions or drops occur
Solution Approach 1:
By segmenting the call into separate audio and video streams on different networks, the system avoids the need to interrupt or drop the entire call during network transitions. Each stream can be managed independently, ensuring call continuity even when switching between networks.
Solution Approach 2:
The system establishes the video stream on the WLAN connection in advance and maintains it there throughout the call duration. This preliminary action of setting up the video path on WLAN before potential network changes occur prevents call interruptions during offloading operations.
3Loss of energy
If video stream is switched from cellular to WLAN, then data costs are reduced, but user experience is disrupted
Solution Approach 1:
Segmenting the call into separate audio and video streams allows the user to experience seamless operation. The audio continues uninterrupted on the cellular network while the video transitions to WLAN, so users do not notice disruptions in the overall call experience.
Solution Approach 2:
The system maintains continuous video transmission by establishing the video stream on WLAN and keeping it active throughout the call. This continuity of useful action ensures that video playback remains smooth and uninterrupted, preserving user experience while reducing data costs.
Data Source
AI summary
A method for offloading a video portion of a video call form a cellular network to a WLAN is provided. The method can include a wireless communication device participating in a video call with a remote device over a connection between the wireless communication device and a cellular network. The video call can include a first video stream carried over a first bearer on the cellular network and an audio stream carried over a second bearer on the cellular network. The method can further include the wireless communication device establishing a connection between the wireless communication device and a WLAN; performing a call setup procedure with the remote device to establish a second video stream over the WLAN; terminating the first video stream; and using the second video stream and the audio stream to continue the video call.