Virtual Dedicated Connections in Packet-Switched VoIP Systems
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Solution Overview
Problem
Existing Voice over Internet Protocol (VoIP) systems face issues with latency, jitter, and bandwidth contention in packet-switched networks, leading to suboptimal call quality and inefficiencies in resource allocation, especially when compared to dedicated circuit-switched systems.
Innovation Solution
A method to create virtual dedicated connections in packet-switched systems by controlling access through a session parameter database and session admission control processor, ensuring that only authorized sessions with predetermined capacity limits are established, allowing unused capacity to be used by general traffic, and enabling easy reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated point-to-point physical circuits are used, then connection reliability and call quality are improved, but system cost and installation complexity increase significantly
Solution Approach 1:
The patent creates virtual copies of dedicated circuit connections by using packet-switched network paths that emulate circuit-switched behavior. Instead of installing physical dedicated circuits, the system creates virtual representations that provide similar reliability guarantees through reservation mechanisms, thereby achieving circuit-like performance without the installation complexity of physical dedicated infrastructure.
Solution Approach 2:
The patent replaces the mechanical/physical circuit-switched system with a packet-switched system that uses software-based connection control. The session admission control processor and session parameter database substitute for physical circuit switching hardware, using data structures and processing logic to achieve connection management functions that traditionally required dedicated physical infrastructure.
2Reliability
If capacity is reserved for simultaneous sessions, then call quality is maintained, but available bandwidth for other traffic is reduced
Solution Approach 1:
The patent implements dynamic capacity allocation where reserved capacity is not statically assigned but dynamically adjusted based on actual session requirements. The session parameter database stores reservation information that can be modified in real-time, allowing the system to optimize bandwidth utilization by releasing reserved capacity when sessions end or reducing reservations when traffic patterns change, thus balancing call quality maintenance with efficient bandwidth utilization.
Solution Approach 2:
The patent changes the parameter of capacity allocation from fixed to variable by using the session parameter database to store and manage reservation parameters. The system can adjust reservation parameters such as bandwidth allocation, time of day, and duration based on actual network conditions and session requirements, allowing flexible trade-offs between guaranteed quality and available bandwidth for other traffic.
3Productivity
If virtual dedicated connections are implemented, then resource utilization efficiency is improved, but system control complexity increases
Solution Approach 1:
The patent creates a universal session admission control mechanism that handles multiple functions through a single system. The session parameter database and admission control processor serve as multi-functional components that manage capacity reservation, session setup, parameter validation, and resource allocation across different types of traffic and sessions, thereby improving resource utilization without proportionally increasing control complexity through specialization.
Solution Approach 2:
The patent introduces a session parameter database as an intermediary layer between the session admission control processor and the network resources. This database acts as a mediator that stores reservation parameters and provides a structured interface for managing virtual dedicated connections, simplifying the control logic by centralizing parameter management and reducing the complexity of direct resource control operations.
4Reliability
If physical dedicated links are installed, then connection robustness is improved, but reconfiguration flexibility and cost are worsened
Solution Approach 1:
The patent implements dynamic reconfiguration of virtual connections by storing session parameters in a database that can be easily modified. When reconfiguration is needed due to relocation or changing requirements, the system updates the session parameter database entries rather than physically reconfiguring links, providing the flexibility of software-based management while maintaining the robustness of reserved capacity through the admission control mechanism.
Data Source
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AI summary
Virtual dedicated voice connections between parties 18, 19 to a packet switched system can be created by reserving capacity for such connections in the packet switched system. The capacity reservable by any one party is limited, to prevent oversubscription of resources in the packet switched. The system incorporates a call admission control processor 12, 17 for controlling access to the packet switched call routing system such that a voice call attempt is successful only if capacity for such a dedicated connection has previously been reserved. The capacity reserved for the virtual connections is made available for use by other traffic when not required for voice sessions.