Call Routing Across Wi-Fi and Cellular Without Handoff Gaps
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Solution Overview
Problem
Users experience call degradation during handoffs between different types of networks due to issues like noise, security concerns, and the difficulty in selecting the most secure channels, leading to potential loss of connectivity and quality of service.
Innovation Solution
A data-communications system that intelligently manages media routing across multiple network channels using edge servers, combining media data from primary and secondary connections based on factors like QoS, location transitions, and user preferences to improve communication quality and redundancy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If users handoff communications between different types of networks (e.g., cellular and Wi-Fi), then network accessibility and connectivity options increase, but call degradation and audio gaps occur due to handoff issues
Solution Approach 1:
The system performs preliminary actions by establishing redundant media paths before handoff occurs. The server proactively sets up alternative communication paths (e.g., both Wi-Fi and cellular) before the user actually needs to switch networks, ensuring continuous media flow during transitions and preventing audio gaps.
Solution Approach 2:
The server acts as an intermediary that manages media routing between different network types. It receives media from multiple sources (Wi-Fi, cellular), processes and combines them, then delivers to the endpoint, coordinating the handoff process and ensuring seamless transitions without direct user intervention.
2Adaptability or versatility
If multiple network channels are made available to users, then connectivity options increase, but noise and signal-quality degradation become more prevalent
Solution Approach 1:
The system continuously monitors quality metrics (MOS scores, packet loss, jitter) from all available network channels and uses this feedback to dynamically select the best path. The server compares real-time performance data and switches media flow based on actual quality measurements, avoiding noisy or degraded channels.
Solution Approach 2:
The server merges media streams from multiple network channels into a single consolidated media flow. By combining packets from different sources (Wi-Fi and cellular) and processing them together, the system achieves load balancing and selects the optimal path dynamically, reducing noise and degradation effects.
3Ease of operation
If users are required to specify and approve network transitions, then user control increases, but user knowledge requirements and complexity increase
Solution Approach 1:
The system performs self-service by automatically managing network selection and media routing without user intervention. The server monitors quality metrics and autonomously switches between networks based on real-time conditions, eliminating the need for users to understand or manually control the complex handoff process.
Solution Approach 2:
The server serves as an intermediary that handles all network transition decisions between the user's device and the network infrastructure. It absorbs the complexity of quality assessment and path selection, presenting a simplified interface where users simply initiate calls without needing to understand network routing details.
4Reliability
If redundant media paths are established for handoff preparation, then connectivity reliability improves, but system complexity and processing requirements increase
Solution Approach 1:
The server establishes redundant media paths in advance before handoff is needed. By pre-configuring alternative routes and maintaining standby connections, the system ensures rapid switchover during network transitions without requiring complex real-time decision-making during the actual handoff moment.
Solution Approach 2:
The system creates copies of media paths by establishing redundant routes that mirror the primary path. These duplicate paths are maintained in a standby state and activated only when needed, providing failover capability without requiring the system to manage multiple complex active simultaneously.
Data Source
AI summary
In certain examples, a service provider provides communications services with endpoint devices. The data-communications services are established via redundant media channels from among disparate last-segment channel types (Wi-Fi, cellular network, etc.) accessible to one endpoint device through an edge server. An incoming call involving one endpoint device is routed via the service provider via primary and secondary network connections via respective first and second ones of the disparate last-segment channel types. In response to the location data for the endpoint device or QoS data, media of the incoming call is combined to improve the quality of the provided data communications services.