Video Telephone Terminal Single Interface Network Switching
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Solution Overview
Problem
Existing video telephone communication technologies require a double interface for both telephone and data networks, leading to inefficient resource utilization and the need for broadband connections, which can be costly and impractical for standard domestic connections.
Innovation Solution
A method that initiates a telephone call over a circuit-switched network, verifies video call availability, releases the telephone call, and establishes a video call over a packet-switched data network using a single network interface, allowing efficient video call setup without the need for a broadband interface or double interface terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a double interface is provided for both telephone and data networks, then video call establishment is enabled, but device complexity and cost increase
Solution Approach 1:
The terminal is designed with a single network interface that can function in both telephone network (circuit-switched) and data network (packet-switched) modes. The interface universally handles both voice and video communications by dynamically switching between network types based on call phase requirements, eliminating the need for separate dedicated interfaces for each network type.
Solution Approach 2:
The system dynamically transitions between different network types during the call establishment process. Initially, the interface operates in telephone network mode for availability verification, then switches to data network mode for actual video call establishment. This dynamic adaptability allows a single interface to serve multiple functions that previously required separate static interfaces.
2Adaptability or versatility
If a broadband interface is required for video calls, then video call quality is improved, but cost and accessibility worsen
Solution Approach 1:
The video call establishment process is segmented into two distinct phases using different network types: Phase 1 uses the existing telephone network for availability verification and call initiation, Phase 2 uses the data network for actual video transmission. This segmentation allows the system to leverage existing narrowband infrastructure for control functions while using packet-switched networks only when needed for video data, reducing the need for continuous broadband connectivity.
Solution Approach 2:
The telephone network acts as an intermediary during the call establishment process. It facilitates the initial connection and verification between terminals, then handoffs the connection to the data network for video transmission. This intermediary role allows the system to bootstrap video calls using existing telephone infrastructure, reducing dependency on dedicated broadband installations.
3Reliability
If the telephone call is kept alive during video call, then continuous communication is maintained, but resource utilization efficiency decreases
Solution Approach 1:
The system uses periodic network switching during the call process. The telephone network is activated during the initial availability verification phase, then deactivated in favor of the data network for video transmission. This periodic switching ensures that each network type is used only when its specific capabilities are needed, optimizing resource utilization while maintaining communication continuity through seamless transitions.
Data Source
AI summary
A method of setting up a video telephone call between a first video telephone terminal and a second video telephone terminal on a data network includes the steps of: establishing a telephone call over a telephone network between the first and second terminals; exchanging between the first and second terminals during the telephone call availability signals to seek availability to hold a video telephone call; if the availability is confirmed, releasing the telephone call; establishing respective telephone calls between each of the first and second terminals and a corresponding access server of the data network, for achieving connection of the first and second terminals to the data network; establishing a signalling exchange between the first and second terminals through a service center of the data network to achieve the set up of the video telephone call; and establishing a peer-to-peer video telephone call between the first and second terminals over the data network.