Vulnerable Road User Terminal Power Management via Network Feedback
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Solution Overview
Problem
Conventional vulnerable road user (VRU) terminals in wireless communication systems passively send safety messages and have inefficient power management, leading to incomplete and unreliable transfer of VRU states, which compromises safety.
Innovation Solution
A method where VRU terminals receive safety service messages from a network, output warning messages based on geographic location, and adjust their operation to maintain a wake state and modify message creation intervals for enhanced safety service delivery, including transmitting moving paths and traffic information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the VRU terminal periodically sends safety messages to reduce power consumption through sleep and wakeup cycles, then power consumption is reduced, but the reliability of safety information transfer deteriorates because the terminal may miss critical transmission opportunities
Solution Approach 1:
The network receives feedback information from the VRU terminal about its sleep and wakeup timing, and uses this feedback to determine optimal transmission timing. This feedback mechanism allows the network to coordinate transmissions with the terminal's active periods, ensuring reliable delivery while maintaining power-saving operation.
Solution Approach 2:
The terminal performs preliminary actions by sending feedback information about its sleep and wakeup patterns before the network attempts transmission. This allows the network to plan transmissions in advance during periods when the terminal is awake and able to receive messages, preventing loss of critical safety information.
2Device complexity
If the VRU terminal operates in a passive manner sending only periodic messages, then device complexity is reduced, but the productivity of safety information delivery deteriorates because real-time safety updates cannot be provided
Solution Approach 1:
The terminal dynamically adjusts its operation mode based on network requests and feedback mechanisms. Instead of a fixed passive periodic transmission pattern, the terminal can switch between sleep mode and active transmission mode based on real-time safety needs and network coordination, enabling both real-time updates and power saving.
Solution Approach 2:
The terminal implements multiple functions within a single operational framework: it can perform periodic safety message transmission, respond to network requests for real-time updates, send feedback about its operational state, and receive configuration information. This multi-functionality allows the same terminal to serve both power-saving and real-time safety information needs.
3Reliability
If the VRU terminal maintains continuous wakeup state to ensure real-time safety information transfer, then reliability of safety service is improved, but power consumption increases
Solution Approach 1:
The terminal uses periodic sleep and wakeup cycles instead of continuous operation. By carefully coordinating these periodic active periods with network transmission timing (using feedback mechanisms), the terminal achieves reliable safety information transfer during wakeup periods while consuming significantly less power during sleep periods compared to continuous wakeup state.
Data Source
AI summary
Disclosed herein is a method of receiving, by a terminal of a vulnerable road user (VRU), a signal in a wireless communication system. The method include receiving a message related to a safety service of the VRU from a network, and outputting a warning message based on comparing a field defining a geographic area, in which the safety service is provided, in the message and a position of the terminal, wherein the warning message is output based on determining that the terminal exists within the geographic area.