Video Interactive Gateway Interworking H.324 H.323 Terminals
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Solution Overview
Problem
The existing Video Interactive Gateway (VIG) faces challenges in interworking between H.324 and H.323 terminals due to mismatched channel descriptions and lack of synchronization, leading to potential media loss during video communication.
Innovation Solution
The method involves the VIG using the forward channel description from the H.323 terminal as both forward and reverse channel descriptions towards the H.324 terminal, initiating Open Logical Channel (OLC) messages accordingly, and employing a timer to manage channel setup and rejection messages to ensure synchronized communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the VIG uses different channel descriptions for forward and reverse channels towards H.324 terminal, then compatibility with H.324 terminal is improved, but channel setup synchronization deteriorates leading to media loss
Solution Approach 1:
The patent merges the forward and reverse channel descriptions by using the same channel description for both directions towards the H.324 terminal. This unification ensures that the H.324 terminal receives consistent channel information, preventing synchronization issues and media loss while maintaining compatibility with H.324 protocol requirements.
Solution Approach 2:
The VIG acts as an intermediary that receives separate forward and reverse channel descriptions from the H.323 terminal, then transforms and relays them as a unified channel description to the H.324 terminal. This mediation resolves the protocol mismatch between H.323 (which uses separate descriptions) and H.324 (which expects unified descriptions), ensuring reliable communication.
2Adaptability or versatility
If the VIG initiates OLC messages with separate forward and reverse channel descriptions, then interworking with H.323 terminal is improved, but channel description mismatch increases causing communication failures
Solution Approach 1:
The patent segments the channel description handling into two distinct stages: (1) receiving and processing separate forward and reverse channel descriptions from the H.323 terminal, and (2) unifying and relaying them as a single channel description to the H.324 terminal. This segmentation allows the VIG to maintain protocol-specific optimizations while ensuring endpoint compatibility.
Solution Approach 2:
Instead of converting the unified H.324 channel description into separate descriptions for H.323, the patent inverts the approach by receiving separate descriptions from H.323 and combining them into a unified description for H.324. This inversion simplifies the transformation logic and ensures that the H.324 terminal receives the expected unified channel description format.
3Productivity
If the VIG uses bi-directional logical channel signalling procedures, then video channel establishment is improved, but protocol complexity increases causing synchronization issues
Solution Approach 1:
The patent extracts the complexity of bi-directional logical channel signalling from the end terminals by implementing it within the VIG. The gateway handles the complex procedure initiation and coordination internally, while presenting simplified unidirectional OLC message exchanges to both H.323 and H.324 terminals. This extraction reduces terminal complexity while maintaining efficient video channel establishment.
Data Source
AI summary
The present invention relates in general to video communication networks and more specifically to a method for interworking between a number of video communication terminals, to a video communication system, and to a video interactive gateway unit. The solution according to the present invention makes it possible to interwork between different terminals e.g. between a low bit-rate multimedia terminal and a packet based multimedia terminal.