VRU Sidelink Receiver Scheduling for Low-Power Safety Messaging
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Solution Overview
Problem
Existing wireless communication systems face challenges in optimizing power consumption for vulnerable road users (VRUs) by efficiently managing message transmission and reception, particularly in scenarios involving frequent changes in direction or speed.
Innovation Solution
A method for VRUs in a wireless communication system that involves turning off the receiver for a specified interval after receiving a message and turning it back on when a change in direction or speed exceeds a reference value, based on the timing of the message transmission by another VRU.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If VRUs continuously receive messages from other VRUs, then safety monitoring reliability is improved, but power consumption increases
Solution Approach 1:
The patent implements periodic message reception by VRUs instead of continuous reception. The receiver is activated at specific intervals to receive messages from other VRUs, then turned off to conserve energy. This periodic operation maintains safety monitoring capability while significantly reducing power consumption compared to continuous reception.
Solution Approach 2:
The patent dynamically adjusts the message reception behavior based on movement conditions. When a VRU's speed or direction changes exceed a reference threshold, the receiver is activated to receive updated safety messages. This dynamic adaptation ensures reliability is maintained during critical movement changes while saving energy during stable movement states.
2Measurement precision
If VRUs receive messages frequently, then safety information accuracy is improved, but power consumption increases
Solution Approach 1:
The system dynamically triggers message reception based on movement changes. When speed or direction changes exceed a reference value, the VRU activates its receiver to obtain updated safety information. This ensures accuracy is maintained during significant movement changes while avoiding unnecessary power consumption during stable movement states.
Solution Approach 2:
The patent uses feedback from movement sensors to control message reception. The VRU monitors its own speed and direction changes, and when these exceed a threshold, it triggers the receiver to obtain updated safety messages. This feedback mechanism ensures safety information accuracy is maintained when needed while reducing power consumption during normal operation.
3Use of energy by moving object
If VRUs turn off the receiver for longer intervals, then power consumption is reduced, but response time to safety changes increases
Solution Approach 1:
The patent dynamically adjusts receiver activation based on movement changes. When speed or direction changes exceed a reference threshold, the receiver is activated to receive safety messages. This ensures that response time is minimized during critical movement changes while maintaining longer intervals during stable states to conserve energy.
Solution Approach 2:
The system uses real-time feedback from movement sensors to control receiver activation timing. When movement parameters change beyond a threshold, the receiver is immediately activated to maintain response time. This feedback-based timing strategy balances energy savings with rapid response to safety-critical events.
Data Source
AI summary
One embodiment relates to a sidelink-related operation method of a first VRU in a wireless communication system, comprising: the first VRU receiving a first VRU message from a second VRU; the first VRU turning off a VRU receiver for a time corresponding to an interval included in the first VRU message; and the first VRU turning on the VRU receiver after the interval and receiving a second VRU message, wherein the interval is determined on the basis of the time from when the second VRU transmits the first VRU message to when at least one of a moving direction or a speed is changed to a reference value or more.