Vehicle Telematics IMS Protocol Detection and Selection
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Solution Overview
Problem
VoLTE-capable vehicle telematics units inefficiently attempt IP multimedia subsystem (IMS) connections with cell towers regardless of the cellular protocol, wasting network resources and energy when VoLTE service is unavailable, as they are programmed to do so by default.
Innovation Solution
The vehicle telematics unit detects the cellular protocol used by a cell tower and selectively disables or enables the IMS protocol based on whether VoLTE is supported, preventing IMS connections when VoLTE is not available and maintaining IMS connections when it is supported, allowing for efficient voice and SMS communication using appropriate protocols.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle telematics unit is programmed to attempt IMS registration regardless of cellular protocol, then VoLTE service is ensured when available, but network resources and energy are wasted when VoLTE is unavailable
Solution Approach 1:
The system performs preliminary detection of cellular protocol support (VoLTE capability) before attempting IMS registration. By checking whether the cell tower supports VoLTE in advance, the telematics unit avoids unnecessary IMS registration attempts when VoLTE is unavailable, thereby conserving energy while ensuring reliable VoLTE service when it is supported.
2Adaptability or versatility
If the vehicle telematics unit attempts IMS registration with all cell towers, then comprehensive service coverage is achieved, but network resources are inefficiently consumed
Solution Approach 1:
The system applies different registration strategies based on local conditions - specifically, whether the detected cell tower supports VoLTE. When VoLTE is supported, IMS registration is attempted; when not supported, registration is skipped. This localized adaptation ensures comprehensive service coverage in VoLTE-capable areas while avoiding unnecessary resource consumption in non-VoLTE areas.
3Device complexity
If the vehicle telematics unit uses LTE for both voice and SMS, then simplified protocol handling is achieved, but compatibility with circuit-switched SMS is lost
Solution Approach 1:
The system dynamically adapts its communication protocol based on the detected cell tower capabilities. When a VoLTE-capable tower is detected, the unit uses LTE for both voice and SMS (simplified mode). When only non-VoLTE towers are available, it switches to using circuit-switched protocols for SMS while maintaining LTE for voice (adaptive mode). This dynamic behavior maintains low complexity while ensuring broad compatibility.
Data Source
AI summary
A system and method of registering a voice over LTE (VoLTE) capable vehicle telematics unit with a wireless carrier system includes: detecting at the vehicle telematics unit a wireless signal broadcast by a cell tower; determining from the wireless signal whether the cell tower provides cellular service using a VoLTE cellular protocol; and when it is determined that the cell tower does not provide cellular service using the VoLTE protocol, then preventing the VoLTE-capable vehicle telematics unit from attempting to wirelessly connect with the cell tower using an IP multimedia subsystem (IMS) protocol.