QoS Server Dynamic Channel Switching for VoIP
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Solution Overview
Problem
Mobile communications technologies face challenges in providing consistent quality of service (QoS) as users transition between different protocols and standards, with older technologies remaining in service, leading to varying service quality that may drop during access sessions.
Innovation Solution
An electronic communications system that integrates a mobile network, wireless local-area network (WLAN), Voice over Internet Protocol (VoIP) service, and public switched telephone network (PSTN), with a quality of service server to determine and switch data channels dynamically to maintain voice call quality by routing communications through the best available channel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple different protocols and standards are supported for gradual transition, then compatibility with older technologies is maintained, but quality of service varies and may drop during access sessions
Solution Approach 1:
The system dynamically selects between multiple communication protocols and networks (mobile network, WLAN, PSTN) based on real-time QoS conditions. The quality of service server continuously monitors data channel quality and switches protocols/nets as needed, making the system adaptable to changing conditions while maintaining consistent service quality.
Solution Approach 2:
The system changes operational parameters by switching between different network protocols and access methods based on QoS metrics. When QoS drops below thresholds, the system transitions from data channel-based communication to alternative protocols or networks, maintaining service quality through parameter adjustment.
2Reliability
If dynamic switching between mobile network, WLAN, and PSTN is implemented, then voice call quality is maintained, but system complexity increases
Solution Approach 1:
A quality of service server acts as an intermediary between the user equipment and multiple networks. This central mediator handles the complexity of monitoring QoS across different networks and making switching decisions, simplifying the architecture by centralizing control rather than distributing complexity across multiple components.
Solution Approach 2:
The quality of service server performs multiple functions: monitoring QoS on mobile networks, evaluating WLAN conditions, managing PSTN connectivity, and making switching decisions. This multi-functional approach reduces overall system complexity by consolidating multiple specialized components into a single universal controller.
3Reliability
If QoS monitoring and dynamic channel selection is implemented, then service disruptions are reduced, but additional infrastructure and processing requirements increase
Solution Approach 1:
The quality of service server preliminarily evaluates QoS conditions on alternative networks before actual switching is needed. By pre-assessing the quality of mobile network data channels, WLAN connections, and PSTN availability, the system prepares switching paths in advance, reducing service disruptions while managing infrastructure requirements efficiently.
Data Source
AI summary
A mobile communications system includes switching between communication paths based on the quality of service. A VoIP service is coupled to a mobile network and a wireless local-area network (WLAN) via a wide-area IP network. A plurality of mobile communications devices are associated with VoIP telephone numbers. A public switched telephone network (PSTN) is coupled to the plurality of mobile communications devices and coupled to the VoIP service. A quality of service server is coupled to the plurality of mobile communications devices via the wide-area IP network for determining the quality of data channels to a mobile communications device via the mobile network and to the mobile communications device via the WLAN. A voice call is carried over one of the mobile network, the WLAN, and the PSTN depending on the quality of the data channels.