Carrier-Grade Voice in IP Video Telephony via QoS Coupling
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Solution Overview
Problem
Current video telephony services over mobile access networks face challenges in maintaining high-quality voice communications due to the best effort nature of Internet Protocol (IP) networks, which lack Quality of Service (QoS) guarantees, and are exacerbated by radio resource limitations and handover issues between different radio access technologies.
Innovation Solution
Implementing a method where user devices and network nodes establish video telephony sessions over best effort networks and upgrade voice quality by setting up voice calls over telephony networks with QoS guarantees, using dual transceiver circuits and processing circuits to coordinate voice and video stream synchronization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If video telephony is provided over mobile access networks using best effort IP networks, then service coverage and accessibility are improved, but voice quality and reliability deteriorate due to lack of QoS guarantees
Solution Approach 1:
The patent segments the communication service into two separate networks: best effort IP network for video transmission and QoS-guaranteed telephony network for voice transmission. This segmentation allows each network to be optimized for its specific function while maintaining overall service quality
Solution Approach 2:
The patent introduces a gateway as an intermediary that connects the best effort IP network and the QoS-guaranteed telephony network. The gateway coordinates between the two networks, enabling voice calls to be routed through the telephony network while video continues over the IP network
2Reliability
If QoS bearers are established over mobile access networks to guarantee voice quality, then voice reliability is improved, but resource consumption and cost increase due to radio resource limitations
Solution Approach 1:
The patent extracts the voice transmission function from the mobile IP network and relocates it to a separate QoS-guaranteed telephony network. This extraction eliminates the need to consume宝贵的 mobile radio resources for voice traffic while preserving them for video traffic
Solution Approach 2:
The patent creates a parallel voice transmission path through the telephony network that copies the voice communication function without requiring additional radio resources from the mobile network, effectively duplicating the voice service over a different infrastructure
3Duration of action of moving object
If handover between different radio access technologies is implemented to maintain connectivity, then service continuity is improved, but voice quality stability deteriorates due to varying data rates and service levels
Solution Approach 1:
Instead of trying to maintain consistent service quality over varying radio networks, the patent inverts the approach by using the best effort IP network for video (which can tolerate variation) and the stable QoS-guaranteed telephony network for voice (which requires consistency)
Data Source
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AI summary
A first user device establishes a video telephony session with a second user device over a best effort network. The voice quality for the video telephony session is upgraded by establishing a voice call with the second user device over a telephony network providing a quality of service guarantee for the voice call, and coupling the voice call over the telephony network with the video telephony session.