ECU Fallback Strategy for Voice Call Continuity
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Solution Overview
Problem
Mobile communication systems for motor vehicles face network outages and increased costs due to telematics modules camping on single voice channels, disrupting voice calls and consuming network bandwidth.
Innovation Solution
A method utilizing an electronic control unit (ECU) with multiple IMS modes to sequentially attempt Voice Over New Radio (VoNR), Voice Over Long Term Evolution (VoLTE), Voice Over Internet Protocol (VoIP), and Circuit Switched Fallback (CSFB) calls across different networks, based on availability and performance thresholds, to ensure continuous voice communication during outages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the telematics module camps on a single voice channel (LTE network) to simplify operation, then ease of operation is improved, but reliability deteriorates due to network outages disrupting voice calls
Solution Approach 1:
The mobile communication system is configured to support multiple voice channels including LTE, 5G, and Wi-Fi networks simultaneously. The system can selectively switch between these networks based on availability and performance, making the communication system universal and adaptable to different network conditions, thereby resolving the contradiction between operational simplicity and reliability.
Solution Approach 2:
The system dynamically selects and switches between different voice channels (LTE, 5G, Wi-Fi) based on real-time network conditions, availability, and performance metrics. This dynamic adaptation allows the system to maintain reliable voice calls while managing complexity through automated network selection rather than manual configuration.
2Reliability
If the telematics module uses multiple voice channels to improve reliability, then voice call reliability is improved, but device complexity increases
Solution Approach 1:
The system implements automated network selection and switching functionality that operates autonomously based on pre-configured criteria such as network availability, signal strength, and performance thresholds. This self-service mechanism eliminates the need for manual intervention or complex user configuration, allowing the system to leverage multiple voice channels for improved reliability while maintaining manageable complexity through automation.
3Reliability
If the system attempts multiple voice call protocols (VoNR, VoLTE, VoIP, CSFB) to ensure connectivity, then reliability is improved, but loss of time increases due to sequential attempt delays
Solution Approach 1:
The system performs preliminary assessments of network conditions, availability, and performance metrics before initiating voice call attempts. By evaluating which network and protocol are most likely to succeed in advance, the system can prioritize the most promising communication path, reducing the time spent on unsuccessful sequential attempts while maintaining high connectivity assurance.
Solution Approach 2:
The system continuously monitors network conditions, call establishment success, and performance metrics during the voice call process. This feedback mechanism allows the system to dynamically adjust its protocol selection strategy, learning from previous attempts and optimizing future call establishment sequences to minimize delays while ensuring reliable connectivity.
Data Source
AI summary
A method of operating a mobile communication system of a motor vehicle is provided for initiating a voice call with a third party. The system includes an ECU, and the ECU includes a controller and a memory storing computer code. The method includes the steps of: (a) initiating a timer; (b) operating the ECU in a first mode in which the ECU attempts to engage in a VoNR call via a first network; (c) repeating step (b) within a predetermined amount of time until the ECU successfully engages in the VoNR call; and (d) operating the ECU in a second mode to attempt to engage in a VoLTE call via a second network in response to the controller determining that the ECU in the first mode did not successfully engage in the VoNR call within a predetermined amount of time.