Mobile Call Control System for Video-Audio Terminal Compatibility
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Solution Overview
Problem
Conventional mobile video telephony systems face limitations in establishing communication links between video communication-enabled terminals and audio-dedicated terminals, as they do not recognize the capabilities of the called party terminal before initiating a call, leading to unnecessary video call attempts when the terminal does not support audiovisual communication.
Innovation Solution
A call control system and method that allows for automatic call setup between mobile terminals with different capabilities by transmitting a video call request message, processing disconnection messages, and initiating audio call requests through a mobile communication network, enabling communication between video telephony and audio-dedicated terminals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a video call request is sent to an audio-dedicated terminal, then the calling terminal attempts to establish video communication, but the called terminal cannot respond to audiovisual communication calls resulting in call setup failure
Solution Approach 1:
The system performs preliminary capability detection by sending a capability inquiry message before initiating the video call. This allows the calling terminal to determine whether the called terminal supports audiovisual communication in advance, preventing unnecessary video call attempts and improving call setup reliability.
Solution Approach 2:
The system implements feedback mechanisms where terminals exchange capability information through inquiry and response messages. The called terminal provides feedback about its communication capabilities, enabling the calling terminal to adapt its call initiation strategy accordingly, thus resolving the contradiction between versatility and reliability.
2Productivity
If the calling terminal periodically attempts video communication with the called terminal, then the calling terminal tries to establish communication, but unnecessary video call attempts are made when the called terminal is audio-dedicated
Solution Approach 1:
The capability inquiry message is sent in advance before video call attempts, allowing the system to identify audio-dedicated terminals proactively. This preliminary action prevents wasted communication attempts and improves overall call establishment efficiency by directing resources only toward compatible terminals.
Solution Approach 2:
The system enables terminals to self-identify their capabilities through the inquiry-response mechanism. Audio-dedicated terminals automatically respond to capability inquiries, allowing the network to automatically route calls appropriately without manual intervention, thereby reducing wasted attempts and improving efficiency.
3Ease of operation
If the calling terminal does not recognize the called terminal's capacity, then the calling terminal can initiate calls freely, but the calling terminal cannot establish communication link with incompatible terminals
Solution Approach 1:
The network acts as an intermediary by facilitating the exchange of capability information between terminals. The network transmits capability inquiry and response messages, enabling the calling terminal to recognize the called terminal's capacity without complicating the user interface, thus maintaining ease of operation while improving link establishment reliability.
Solution Approach 2:
The system performs preliminary capability recognition through automated inquiry messages before call establishment. This background process occurs transparently to the user, maintaining operational simplicity while ensuring that only compatible terminals attempt communication, thereby improving reliability.
Data Source
AI summary
A call control system and method for mobile video telephony that enables an automatic call setup between a mobile video telephony terminal and a mobile audio-dedicated terminal is disclosed. A call control method for communication between mobile terminals having different capabilities includes receiving, at a called party terminal, a call setup message, transmitting a disconnection message to a calling party terminal in response to the video call setup message and performing a call setup procedure triggered by the called part terminal.