3G-324M Call Setup Time Reduction via Phantom Channels
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Solution Overview
Problem
Current 3G-324M call setup technologies result in prolonged call setup times, exceeding 10 seconds, which negatively impacts user experience, and existing proposals like FastMedia and Fast Session Setup cannot coexist due to incompatible mechanisms.
Innovation Solution
A method that establishes preconfigured phantom channels using Fast Media procedures, allowing for flexible H.245-type logical channel operation point negotiation, enabling fast and flexible call setup by invoking either Fast Logical Channel Setup or another session negotiation method based on channel availability, and utilizing different H.223 logical channels for different call setup methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional H.245 capability negotiation is used, then full flexibility in codec selection is achieved, but call setup time increases to 10-20 seconds
Solution Approach 1:
The patent applies preliminary action by pre-configuring phantom channels with media information before the actual call setup. The H.223 multiplex table is pre-populated with phantom channel entries that contain placeholder media information, allowing the system to bypass the lengthy H.245 capability negotiation process. When a call is initiated, the pre-configured phantom channels enable immediate media transmission without waiting for full capability exchange, thus reducing call setup time while maintaining codec flexibility through subsequent capability negotiation.
2Loss of time
If FastMedia preconfigured channels are used, then call setup time is reduced, but compatibility with Fast Session Setup and other proposals is lost due to incompatible mechanisms
Solution Approach 1:
The patent applies universality by designing the phantom channel mechanism to serve multiple session setup methods. The H.223 multiplex table is configured to include phantom channel entries that can be utilized by different session setup proposals (FastMedia, Fast Session Setup, and others). Each proposal can announce its presence and utilize the phantom channels through their respective mechanisms, allowing multiple incompatible session setup methods to coexist and operate over the same pre-configured channel infrastructure, thus maintaining interoperability while achieving fast call setup.
Data Source
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AI summary
The call setup time, after bearer channel setup, in 3G-324M systems is currently in the order of magnitude of ten to twenty seconds. The resulting user experience is such that users have to wait 10 seconds or even longer for a video phone call to connect, than for a voice call. Thus, a technique for call setup time improvement is required. Several proposals have been made in relevant standardization bodies. The two recent ones that have seen the most interest from standardization groups are perhaps FastMedia (FM) and Fast Session Setup (FSS). FastMedia operates by pre-populating the ITU-T Recommendation H.223 Multiplex table with hard-coded operation points. If FastMedia fails (NO in step S21), the prior art falls back to legacy and slow H.245. According to the invention, instead of falling back to legacy and slow H.245, a known FSS procedure such as Fast Logical Channel Setup, if present, is invoked (step S23).