Vehicle BLE Scanning Duty Cycle for Reliable Mobile Access
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Solution Overview
Problem
In automotive applications, the unbalanced link budget between a vehicle's wireless communication device and a mobile device, such as a smartphone, leads to failed connection establishment due to insufficient transmission power and low scanning duty cycles, resulting in delayed or failed vehicle access.
Innovation Solution
Adjusting the scanning duty cycle for advertisement packets in response to receiving a signal from a mobile device, increasing the duty cycle to enhance the likelihood of successful connection establishment by ensuring subsequent packets are received as the device approaches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the vehicle uses lower transmission power for BLE advertisements, then energy consumption is reduced and coverage area is increased, but the connection request may not be properly received by the mobile device
Solution Approach 1:
The patent applies dynamics by making the scanning duty cycle adjustable rather than fixed. The control module dynamically changes the scanning duty cycle from a first value to a second value based on whether the mobile device has been detected, allowing the system to adapt between energy-saving mode (low duty cycle) and connection-reliability mode (high duty cycle) as needed
Solution Approach 2:
The patent changes the parameter of scanning duty cycle from a static configuration to a dynamic variable. By modifying the duty cycle parameter in response to detection events, the system optimizes both energy consumption and connection reliability at different stages of the interaction
2Use of energy by moving object
If the vehicle uses low scanning duty cycle for advertisement packets, then energy consumption is reduced, but subsequent advertisement packets may be missed as the mobile device approaches
Solution Approach 1:
The scanning duty cycle is made dynamic, switching from a low first value to a higher second value when the mobile device is detected. This allows the system to maintain low energy consumption during normal operation while ensuring reliable packet reception when needed
Solution Approach 2:
The system uses feedback from detecting mobile device advertisements to trigger a change in scanning behavior. The control module monitors received advertisements and adjusts the scanning duty cycle accordingly, creating a closed-loop system that responds to actual communication needs
3Use of energy by moving object
If the vehicle transmits connection requests with lower power, then energy consumption is reduced, but the connection request may not be properly received by the mobile device
Solution Approach 1:
The system dynamically adjusts the scanning duty cycle based on the communication state. When the mobile device is detected, the duty cycle increases to ensure reliable connection establishment, while maintaining lower power consumption during other periods
Data Source
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AI summary
Examples relate to a wireless communication device for a vehicle, to a method and a computer program for a wireless communication device and to a vehicle comprising a wireless communication device. The wireless communication device comprises a transceiver module for communicating with a further wireless communication device. The wireless communication device comprises a control module configured to scan one or more wireless communication channels for advertisement packets. The wireless communication device is configured to receive an advertisement packet from the further wireless communication device. The wireless communication device is configured to adjust a duty cycle of the scan for the advertisement packets for a pre-defined time interval in response to receiving the advertisement packet.