Inter-Vehicle Communication Congestion Control via Dynamic Parameter Adjustment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In traffic congestion regions, inter-vehicular communication networks experience network congestion due to uncontrolled transmission of safety messages, leading to increased channel access delays and packet loss, which can be fatal for safety driving services.
Innovation Solution
A communication apparatus and method that estimates network state information based on driving and channel information, controlling message transmission probability and timing to avoid congestion, using a network state estimating unit, network access controller, and transmission scheduler to delay message transmission according to packet error rate, channel busy ratio, and vehicle density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If safety messages are transmitted periodically to all neighboring vehicles, then real-time driving situation recognition is improved, but network congestion occurs due to uncontrolled transmission
Solution Approach 1:
The patent dynamically changes transmission parameters (transmission probability, power, data rate) based on network state conditions such as packet error rate, channel busy ratio, and vehicle density. When network congestion is detected, the system adjusts these parameters to reduce transmission load while maintaining essential safety communications.
Solution Approach 2:
The system transitions from static periodic transmission to dynamic adaptive transmission. The network access controller continuously monitors network state information and adjusts transmission behavior in real-time, making the transmission protocol flexible and responsive to changing network conditions.
2Reliability
If transmission power is increased to improve message reception reliability, then packet loss is reduced, but energy consumption increases
Solution Approach 1:
The transmission power is dynamically adjusted based on network state information. When network conditions are good, higher power can be used for reliable transmission. When congestion is detected, power is reduced to conserve energy and reduce interference, while still maintaining acceptable reception reliability through adaptive modulation and coding.
3Reliability
If message transmission frequency is increased to improve safety service quality, then accident prevention capability is enhanced, but channel access delay increases
Solution Approach 1:
The system dynamically changes the transmission frequency and timing based on network conditions. When the network is less congested, messages are transmitted more frequently. When congestion is detected, the transmission interval is increased to reduce channel access delay, while still maintaining safety service quality through selective transmission of critical information.
Data Source
AI summary
A communication apparatus for inter-vehicular communication according to the present invention includes: a network state estimating unit configured to estimate network state information indicating a current network state based on driving information and channel state information of neighboring vehicles; a network access controller configured to control whether to transmit a message based on the network state information; a transmission scheduler configured to control a transmission time point of the message based on the network state information; and a transmission buffer unit configured to delay transmission of the message according to the control of the transmission time point of the transmission scheduler.