PSM Transmission Interval Control for Low-Battery VRU Communication
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Solution Overview
Problem
Existing wireless communication systems in intelligent transport systems (ITS) do not efficiently manage battery consumption in vulnerable road user (VRU) devices when the battery charge falls below a predetermined level, leading to unnecessary battery drain and potential communication disruptions.
Innovation Solution
Adjust the personal safety message (PSM) transmission interval and cluster leadership based on battery status, incorporating additional battery status and saving notification elements to optimize power usage and communication efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If PSM transmission continues at regular intervals regardless of battery status, then communication reliability is maintained, but battery consumption increases unnecessarily
Solution Approach 1:
The PSM transmission interval is made dynamic rather than fixed. When battery level is sufficient, transmissions occur at standard intervals. When battery level drops below the threshold, the transmission interval automatically extends to a longer period, reducing energy consumption while maintaining essential communication functionality
Solution Approach 2:
The transmission parameter (interval) is changed based on battery status. The system monitors battery level and adjusts the PSM transmission interval parameter accordingly - using a first interval when battery is adequate and a second, longer interval when battery is low, thereby optimizing energy usage
2Reliability
If all VRU devices transmit PSM continuously, then safety monitoring coverage is maximized, but overall system energy consumption increases
Solution Approach 1:
Instead of all devices transmitting at full frequency, only devices with sufficient battery power transmit at the standard interval. Devices with low battery transmit less frequently, providing partial coverage that maintains overall system safety monitoring while significantly reducing total energy consumption across the network
Solution Approach 2:
The system implements feedback through battery status reporting. When a device detects low battery, it notifies the server, which then adjusts that device's transmission interval. This feedback loop allows the system to dynamically optimize energy consumption while maintaining safety coverage
Data Source
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Figure 2(a)~2(b)
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AI summary
Disclosed is a method of transmitting a message by a device in a wireless communication system according to at least one of the various embodiments. The method includes: obtaining information regarding a status of a battery of the device; and transmitting a personal safety message (PSM) including a first data element (DE) for notifying an event occurring on the device, based on the information regarding the battery status of the device and a battery charging threshold. Based on that a field for notifying a low battery status in the first DE is set to a TRUE value, the PSM may be configured to further include a second DE for providing information regarding a PSM transmission interval of the device in the low battery status.