Cellular to Wi-Fi Hand-off Control via Test Call Verification
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Solution Overview
Problem
Current systems for transferring calls from cellular networks to Wi-Fi networks require manual intervention and lack reliability due to network congestion and changing conditions, making automated hand-offs unreliable.
Innovation Solution
A hand-off control system that initiates a test VOIP call to assess network quality before executing a hand-off from a cellular network to a Wi-Fi network, ensuring that the network conditions meet predetermined thresholds for latency, error rate, congestion, and other factors before completing the transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If automated hand-off is implemented without test calls, then ease of operation is improved, but reliability deteriorates due to network congestion and changing conditions
Solution Approach 1:
The system performs preliminary actions by initiating test VOIP calls before executing the actual hand-off. This allows the system to assess network conditions (latency, error rate, congestion) in advance and only proceed with hand-off if conditions meet predetermined thresholds, thereby ensuring reliability while maintaining automation.
2Reliability
If test VOIP calls are implemented before hand-off, then reliability is improved, but loss of time increases due to additional testing steps
Solution Approach 1:
The system applies partial action by conducting only necessary test calls with controlled duration to assess key network parameters. The testing is sufficient to determine hand-off suitability but limited in scope to minimize time loss. The system uses predetermined thresholds to make quick decisions without excessive testing.
3Reliability
If manual intervention is required for hand-off, then reliability is improved through human judgment, but ease of operation deteriorates
Solution Approach 1:
The system implements feedback mechanisms by continuously monitoring network conditions (RSSI, latency, error rate, congestion) and using this information to automatically make hand-off decisions. The feedback loop allows the system to assess whether target network conditions meet predetermined thresholds and adjust hand-off timing accordingly, replacing manual judgment with automated intelligence.
Data Source
AI summary
Reliable call hand-offs from a cellular network to a Wi-Fi network. A hand-off controller detects a hand-off condition (e.g., hand-off request, potential/predicted hand-off request) and, in response, initiates a test call. For example, a telephone call made through a smart phone, using a cellular network (e.g., Verizon, AT&T or Sprint) can be handed over to a hot spot at a Starbucks. In response to detecting an available data network, transmission quality for VOIP conditions is automatically tested. If the network conditions meet a certain predetermined threshold, the VOIP hand-off is executed. If the predetermined threshold is not met, the VOIP hand-off may not be executed, or may be delayed.