Wireless Routing Device Access Network Selection
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Solution Overview
Problem
Conventional mechanisms for selecting the best access network for voice services in VoWiFi are simplistic and based on limited information, leading to potential Quality of Experience (QoE) issues due to congestion and instability, as they assume WLAN and VoWiFi links are always more stable than cellular networks.
Innovation Solution
A method and apparatus that calculate a quality score for non-cellular wireless links and compare them against alternative networks, allowing or rejecting voice service requests based on the quality assessment to steer the mobile device to the most suitable network, ensuring optimal voice communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional access network selection mechanisms prioritize WLAN for voice services, then device complexity is reduced and ease of operation is improved, but quality of service deteriorates due to congestion and instability in WLAN networks
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously monitors network quality metrics (congestion levels, stability) for both WLAN and cellular networks, and dynamically adjusts access network selection based on real-time conditions. This allows the system to maintain simple operation while improving service reliability by switching to the better network when quality deteriorates.
Solution Approach 2:
The patent transforms the static access network selection policy into a dynamic one by introducing real-time network quality assessment and adaptive switching capabilities. The system can change its behavior based on current network conditions, selecting WLAN when quality is good and cellular when quality deteriorates, thereby resolving the contradiction between simple operation and reliable service.
2Reliability
If the system implements comprehensive network quality monitoring and comparison, then voice service quality is improved, but device complexity increases
Solution Approach 1:
The patent introduces an intermediary network selection entity that centralizes the complex quality monitoring and comparison functions. This intermediary handles the sophisticated network assessment and decision-making, while the end devices can operate with simpler logic, thus improving service quality without proportionally increasing overall system complexity.
Solution Approach 2:
The patent implements selective network monitoring that focuses only on the critical quality metrics needed for voice services rather than comprehensive monitoring of all network parameters. This partial action approach provides sufficient quality improvement while limiting the increase in system complexity to only what is necessary for voice service optimization.
3Loss of time
If the system always selects WLAN for voice services, then loss of time for network switching is reduced, but quality of service deteriorates due to WLAN congestion and instability
Solution Approach 1:
The patent implements preliminary network quality assessment and pre-positioning of voice service traffic on the appropriate network before actual service delivery. By evaluating network conditions in advance and proactively selecting the optimal network, the system avoids last-minute switching and ensures service stability without incurring switching delays.
Solution Approach 2:
The patent enables the system to skip the network switching process entirely by maintaining voice service traffic on the currently optimal network. When WLAN quality is good, traffic continues on WLAN without switching to cellular, thereby avoiding switching time losses while still ensuring service quality through continuous quality monitoring.
Data Source
AI summary
A method of operating a wireless routing device to control access to a voice communication service by a mobile device connected to a wireless local area network (WLAN) of the wireless routing device, the mobile device having a cellular network interface and a non-cellular wireless network interface, the method including identifying a request from the mobile device to a cellular network gateway of the cellular network for access to the voice communication service; performing a process prior to forwarding the request to the cellular network gateway comprising: calculating a quality score for a non-cellular wireless link between the mobile device and the cellular network gateway for accessing the voice communication service; requesting observed network information from the mobile device; and comparing the quality of the non-cellular wireless network link against the respective quality of at least one alternative network observed by the mobile device; and if the quality of the non-cellular wireless network link is greater than the quality of an available alternative network; allowing the request to proceed to the cellular network gateway; if the quality of at least one of the alternative networks is higher than the non-cellular wireless network link, rejecting the voice service request.