Mobile Device Wi-Fi Call Handover Management to Prevent 5G Standalone Drops
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Solution Overview
Problem
5G standalone networks experience call drops during Voice over Wi-Fi handovers due to missing network features in the 5G Core Access and Mobility Management Function (AMF) and Unified Data Management (UDM) nodes, which current standards-based solutions cannot effectively address.
Innovation Solution
Mobile devices are configured to prevent handovers from Wi-Fi calls to 5G standalone networks, instead opting for 4G or 5G non-standalone networks, using device settings and logic to manage handovers based on Wi-Fi calling status, Wi-Fi connection state, and evolved packet data gateway (ePDG) tunnel state, thereby avoiding call drops.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If handover from Wi-Fi call to 5G standalone network is performed, then network coverage is extended, but call drops occur due to missing network features in 5G Core AMF and UDM nodes
Solution Approach 1:
The patent introduces an intermediary mechanism (handover management logic) that mediates between Wi-Fi calling and cellular network handover. This intermediary evaluates network conditions and call state to determine whether to allow handover to 5G standalone network or redirect to alternative networks, thereby preventing call drops caused by missing 5G Core features while still enabling network extension benefits
2Reliability
If handover from Wi-Fi call to cellular network is performed, then connectivity is maintained, but handover delay increases
Solution Approach 1:
The patent implements preliminary action by pre-evaluating handover conditions and pre-establishing alternative network paths before actual handover is needed. The handover management logic continuously monitors network conditions and call state in advance, so when handover becomes necessary, the decision can be made quickly without extensive real-time evaluation, thereby reducing handover delay while maintaining connectivity
Data Source
AI summary
The disclosed technology is directed towards preventing a handover of a Wi-Fi call to a Fifth Generation (5G) standalone cellular network. In one alternative, a 5G standalone usage setting is disabled on a mobile device when Wi-Fi calling is enabled on the mobile device. In another alternative, a 5G standalone usage setting is disabled on a mobile device when Wi-Fi calling is enabled on the mobile device and the mobile device is connected to a Wi-Fi network, which facilitates camping on a 5G standalone network when the mobile device is not connected to a Wi-Fi network. In yet another alternative, a 5G standalone usage setting is disabled on a mobile device when an evolved packet data gateway (ePDG) tunnel is set up on the mobile device, which similarly facilitates camping on a 5G standalone network when the ePDG tunnel is torn down.