Telematic Control Unit Extended Discontinuous Reception Mode
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Solution Overview
Problem
Connected telematic control units in vehicles face challenges in optimizing battery usage due to high power consumption and increased signaling load, especially when vehicles are parked for extended periods, leading to inefficiencies in energy management.
Innovation Solution
A method and system for a telematic control unit to determine and initiate an extended discontinuous reception mode based on vehicle-specific conditions, such as inactivity and energy levels, to optimize battery usage by reducing unnecessary communication and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the telematic control unit maintains continuous communication connectivity, then the vehicle can receive timely information and events, but the battery consumption increases significantly
Solution Approach 1:
The telematic control unit implements extended discontinuous reception mode where the radio interface circuit periodically switches between active and sleep states. The control unit determines an extended discontinuous reception time based on vehicle-specific conditions, allowing the device to wake up at predetermined intervals to check for messages while remaining in low-power mode for extended periods, thus reducing battery consumption while maintaining communication availability
Solution Approach 2:
The system dynamically adjusts the discontinuous reception time based on real-time vehicle conditions such as ignition state, alarm status, and communication activity. When the vehicle is parked and no communication is needed, the reception time is extended longer; when communication activity is detected or the vehicle is in use, the reception time is reduced to maintain connectivity, creating a dynamic balance between power saving and communication reliability
2Duration of action of stationary object
If the telematic control unit uses extended discontinuous reception mode, then the battery life is prolonged, but the signaling load and communication efficiency decrease
Solution Approach 1:
The control unit continuously monitors vehicle-specific conditions including ignition state, alarm status, and communication activity to dynamically adjust the discontinuous reception time. This feedback mechanism ensures that the system extends battery life through longer sleep periods when communication is not needed, while automatically reducing sleep duration and increasing communication efficiency when vehicle events or messages are detected
Solution Approach 2:
The system changes the reception parameter (discontinuous reception time) based on different operational states. By adjusting the reception interval according to vehicle conditions such as whether the ignition is on, alarm is active, or communication activity is detected, the system optimizes both battery life extension and communication efficiency for each specific scenario
3Speed
If the telematic control unit frequently wakes up to check for messages, then the communication responsiveness is improved, but the power consumption increases
Solution Approach 1:
The control unit implements periodic wake-up cycles with extended sleep intervals, waking up at predetermined times to check for messages and then returning to low-power mode. This periodic action maintains communication responsiveness by regularly checking for messages while maximizing battery savings through extended sleep periods between wake-ups
Solution Approach 2:
The system dynamically adjusts the wake-up frequency and reception time based on real-time vehicle conditions. When the vehicle is in a parked state with no active communication needs, the reception time is extended longer, reducing wake-up frequency. When communication activity is detected or the vehicle is in use, the system reduces sleep duration and increases responsiveness, creating a dynamic balance between speed and power consumption
Data Source
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AI summary
A method for control of a telematic control unit comprises obtaining (S 11) of information of discontinuity-beneficial conditions, associated with a vehicle to which the telematic control unit is connected. The discontinuity-beneficial conditions indicate that an extended discontinuous reception mode would be beneficial for the telematic control unit and the vehicle to which it is connected. A determination of an extended discontinuous reception time for the telematic control unit to propose is obtained (S 13). A request for an extended discontinuous reception mode for the telematic control unit is initiated (S15) as a response to obtained discontinuity-beneficial conditions, proposing the determined extended discontinuous reception time. A telematic control unit configured for performing such a control method is also presented.