Wireless Access Point Gating for Reliable VoWiFi Handover
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Solution Overview
Problem
Conventional VoWiFi systems fail to ensure reliable voice service connectivity due to inadequate network condition assessment, leading to users experiencing strong Wi-Fi connections without functional data services, as mobile devices prefer WLAN over cellular interfaces without verifying the ability to support voice service requirements.
Innovation Solution
A method and apparatus that determine performance metrics for both wireless and wide area network interfaces to assess whether current network conditions can support VoWiFi services, comparing these metrics against set thresholds to either allow or block voice service connections, ensuring stable VoWiFi access by selectively managing device connections between VoLTE and VoWiFi.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If mobile devices prefer WLAN interface for data connectivity when both WLAN and cellular access is available, then data connectivity efficiency is improved, but voice service reliability deteriorates due to inadequate network condition assessment
Solution Approach 1:
The access point performs preliminary assessment of network conditions (WAN link quality, bandwidth availability) before allowing VoWiFi service registration. This advance checking prevents devices from registering to voice services when network conditions are insufficient, thereby maintaining voice service reliability while preserving WLAN preference for data connectivity.
Solution Approach 2:
The system implements feedback mechanisms where the access point continuously monitors WAN link performance metrics and uses this information to dynamically control VoWiFi access. When WAN conditions deteriorate below thresholds, the system feedbacks this information to block voice service access, ensuring reliable voice connectivity is maintained.
2Stability of the object's composition
If mobile devices connect to WLAN with strong signal strength, then connection stability is improved, but functional data services deteriorate when there is no onward connection to external networks
Solution Approach 1:
The access point performs preliminary verification of WAN link connectivity and quality before permitting device registration to services. This advance assessment ensures that even though devices have stable WLAN connections, they only access services when the broader network path to external networks is functional, preventing the confusion of strong connection icons without actual service functionality.
3Ease of operation
If the access point allows devices to register to VoWiFi services based only on WLAN signal strength, then ease of operation is improved, but service quality deteriorates due to lack of network condition verification
Solution Approach 1:
The access point acts as an intermediary between devices and VoWiFi services, inserting a network condition verification layer in the registration process. This intermediary function automatically assesses WAN link quality and bandwidth availability, maintaining operational simplicity for users while ensuring service quality through backend network condition verification.
4Reliability
If the system implements comprehensive network condition assessment for VoWiFi access, then voice service reliability is improved, but device complexity increases due to additional performance metric monitoring
Solution Approach 1:
The access point performs self-service network condition monitoring by automatically assessing its own WAN link quality, bandwidth availability, and overall network capacity. This self-service approach eliminates the need for complex device-side monitoring while maintaining high voice service reliability through centralized network assessment at the access point.
Data Source
AI summary
A wireless access point is configured to regularly monitor the status of WLAN, WAN and ePDG data links to determine whether the current connections are sufficient to support VoWiFI services. When a device connects to the WLAN of the hub and attempts to switch from its VoLTE service to VoWiFi via the hub, the hub is configured to determine whether the current conditions can satisfy a VoWiFi connection. If the VoWiFi service can support the connection, the request is routed to the ePDG associated with the mobile device's subscriber LTE network. However, if the current conditions cannot satisfactorily support a VoWiFi connection such that incoming calls may be missed or the quality of active calls would not be clear, then the hub is configured to block the request so that the client device will time out and remain connected to VoLTE.