Roadside Unit Dynamic V2X Message Transmission Power Control
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Solution Overview
Problem
Current roadside units (RSUs) use fixed transmission power and antenna settings for V2X messages, resulting in all messages having the same reception range, which is inefficient and may not reach vehicles in time for them to react to important information.
Innovation Solution
Implementing a method in RSUs to dynamically determine the transmission power level and direction of V2X messages based on received vehicle information, road conditions, weather conditions, and the nature of the message, ensuring that messages are received by vehicles at a minimum reception distance that allows sufficient time for reaction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If fixed transmission power is used for all V2X messages, then device complexity is reduced and ease of operation is improved, but message reception reliability deteriorates and reaction time may be insufficient
Solution Approach 1:
The patent implements dynamic transmission power adjustment where the RSU changes transmission power levels based on real-time conditions including vehicle distance, message type, road conditions, and weather. This dynamic approach ensures reliable message reception while adapting to varying operational requirements, resolving the contradiction between fixed simplicity and dynamic reliability.
Solution Approach 2:
The system changes the transmission power parameter based on multiple factors: message priority (safety-critical vs. information), vehicle distance from RSU, road conditions (wet, icy, curved), and weather conditions. By adjusting this key parameter dynamically, the system achieves reliable reception without requiring complex hardware modifications.
2Reliability
If high transmission power is used to ensure messages reach vehicles in time, then message reception reliability is improved, but energy consumption increases and unnecessary message traffic is generated
Solution Approach 1:
The patent applies different transmission power levels to different message types and different vehicle locations. Safety-critical messages receive higher power while informational messages use lower power. Messages are directed specifically to vehicles that need them based on their position and context, reducing wasted energy on vehicles that don't require the information.
Solution Approach 2:
The system uses just enough transmission power to reach the minimum required distance for reliable reception, not excessive power. By calculating the precise power level needed based on vehicle distance and conditions, the system avoids energy waste while ensuring messages are received in time for vehicle reaction.
3Reliability
If fixed antenna settings are used, then device complexity is reduced, but message reception reliability deteriorates for vehicles at different distances and locations
Solution Approach 1:
The patent implements dynamic antenna pattern adjustment where the RSU changes beam direction and width based on vehicle location, distance, and message priority. This allows the system to focus transmission energy toward specific vehicles that need information while reducing transmission in other directions, improving reliability without requiring physically movable antennas.
Solution Approach 2:
The system changes antenna parameters including beam direction, beam width, and antenna selection based on real-time conditions. This software-controlled parameter adjustment provides adaptive performance similar to mechanical antenna systems but with faster response and lower mechanical complexity.
4Area of stationary object
If transmission power is increased to extend reception range, then coverage area is improved, but energy consumption increases and message traffic efficiency decreases
Solution Approach 1:
The patent provides different coverage areas for different message types and different spatial zones. High-priority safety messages use higher power for extended range, while low-priority informational messages use lower power for limited range. This localized quality adjustment optimizes the trade-off between coverage and efficiency for each message type.
Solution Approach 2:
The system transmits messages only to the extent necessary - using minimum required power to reach vehicles that need the information. By avoiding excessive transmission range, the system maintains high transmission efficiency while still providing adequate coverage for vehicles within the relevant zone.
Data Source
AI summary
Various embodiments include method performed by a processor of a roadside unit (RSU) processing system for controlling a message transmissions. In various embodiments, the RSU processing system may receive vehicle-to-everything (V2X) information from a vehicle, determine, based on the received V2X information, a minimum reception distance at which the vehicle or operator of the vehicle will reliably receive a message from the RSU and have time for the vehicle to react to the message, determine a transmission power level based on the determined minimum reception distance, and transmit the message to the vehicle using the determined transmission power level. In various embodiments, the RSU processing system may determine the transmission power level taking into account vehicle speeds, vehicle locations, road conditions, weather conditions and/or the type of message being transmitted.