Active Call Handover via MNO Mediator and Invitation Signals
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Solution Overview
Problem
Current wireless communication systems face difficulties in smoothly transferring an active call between different user equipment devices, such as smartphones and vehicles, due to limitations imposed by mobile network operators.
Innovation Solution
A method for active call handover is implemented, where a mobile network operator receives a handover request to transfer an active call from a first user equipment to a second user equipment, sending invitation messages to both devices, and transferring the call, which can involve different communication profiles like eSIM, ensuring secure communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a mobile network operator limits call transfer capabilities, then network control and security are improved, but call handover between devices becomes difficult or impossible
Solution Approach 1:
The system performs preliminary actions by establishing invitation messages and handover parameters before the actual call transfer. The mobile network operator pre-configures the handover procedure, including sending invitation messages to both the second UE and third-party device, ensuring that all necessary network resources are prepared in advance to enable seamless call handover while maintaining network control.
Solution Approach 2:
The mobile network operator acts as an intermediary between the first UE and second UE during the call handover process. The operator receives the handover request, processes the invitation messages, and coordinates the call transfer, thereby enabling call handover capability while maintaining network control and security through centralized management.
2Ease of operation
If call handover procedure is simplified, then ease of operation is improved, but call disruption and timeout errors increase
Solution Approach 1:
The system implements feedback mechanisms through timeout periods and error handling procedures. The mobile network operator monitors the handover process and can detect timeouts or errors in the invitation messages. If a timeout occurs or an error is detected, the system can abort the handover and restore the original call, thereby maintaining call continuity while keeping the procedure user-friendly.
Solution Approach 2:
The system prepares for potential failures by implementing timeout periods and error handling mechanisms before they occur. The mobile network operator sets timeout thresholds and monitors the handover process, ready to abort and restore calls if issues arise, thus cushioning against call disruptions while maintaining operational simplicity.
3Adaptability or versatility
If multiple communication profiles are supported, then adaptability is improved, but system complexity increases
Solution Approach 1:
The mobile network operator implements a universal handover procedure that works across multiple communication profiles (e.g., eSIM, SIM, non-SIM). The system uses standardized invitation messages and handover parameters that can be applied regardless of the specific communication profile, thereby supporting multiple profiles without significantly increasing operational complexity for the user.
Data Source
AI summary
A method for an active call handover, including: receiving, at a mobile network operator (MNO), a handover request to transfer an active call, which is currently active between a first user equipment (UE) and a third-party device, from the first UE to a second UE; sending, by the MNO, a first invitation message to the second UE and a second invitation message to the third-party device; and transferring the active call from the first UE to the second UE.