Mobile Unit Broadcast Message Rate Adaptation
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Solution Overview
Problem
Current mobile wireless communication systems face challenges in efficiently transmitting safety messages due to limited channel capacity, particularly in high-density traffic scenarios or adverse conditions, leading to delayed or lost messages, which can compromise vehicle safety.
Innovation Solution
A method that dynamically adjusts the transmission rate of safety messages based on vehicle speed and prevailing conditions, using a combination of local sensors and external information to increase the frequency of updates during high-risk situations and reduce it in benign conditions, thereby optimizing channel loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If message transmission rate is increased to provide timely safety information, then safety monitoring reliability is improved, but communication channel capacity is overwhelmed leading to message delays and losses
Solution Approach 1:
The patent implements dynamic adjustment of message transmission rates based on real-time vehicle speed and environmental conditions. The system transitions from static periodic transmission to adaptive variable-rate transmission, where fast-moving vehicles in adverse conditions transmit more frequently while slow-moving vehicles in benign conditions transmit less frequently, optimizing the balance between safety monitoring reliability and channel throughput capacity
Solution Approach 2:
The system changes the transmission rate parameter dynamically based on vehicle speed and environmental conditions. By adjusting the message frequency parameter according to prevailing conditions (adverse vs. benign), the system optimizes the trade-off between providing timely safety information and preventing channel overload, thereby improving reliability without permanently exceeding channel capacity
2Loss of time
If message transmission rate is maintained at high frequency for all vehicles, then safety information timeliness is improved, but communication channel loading increases leading to system overload
Solution Approach 1:
The patent applies different transmission rates to different vehicles based on their specific conditions rather than using a uniform rate for all. Fast-moving vehicles in adverse conditions receive higher transmission priorities and frequencies, while slow-moving vehicles in benign conditions use lower frequencies, creating a localized quality approach that optimizes timeliness for critical cases while reducing overall message volume
Solution Approach 2:
The system applies partial action by transmitting messages at high frequency only when necessary (fast movement + adverse conditions), rather than continuously for all vehicles. This selective approach ensures timeliness for critical safety information while avoiding excessive message transmission during benign conditions, thereby reducing overall channel loading
Data Source
AI summary
A method and system for setting transmission rate of messages transmitted and received by a mobile unit. The method and system include monitoring the speed of the mobile unit; and adjusting the transmission rate based on the speed of the mobile unit. Prevailing conditions may also be determined and the transmission rate may be further adjusted based on the prevailing conditions. The prevailing conditions may be determined based on at least one of states of one or more sensors local to the mobile unit and information provided from an external source over a communication system. The prevailing conditions may include at least one of slick pavement, limited visibility, road construction, object in roadway, accident, dense traffic, and anomalous driving behavior.