C-V2X BSM Transmission Control for Channel Congestion Suppression
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Solution Overview
Problem
Existing V2X communication systems face congestion issues due to frequent transmission of Basic Safety Messages (BSMs), which are not adequately addressed by current congestion control methods at the access layer, particularly impacting C-V2X communication.
Innovation Solution
A communication apparatus calculates a generation interval and transmit power for BSMs based on channel busy ratio and vehicle density to optimize BSM transmission over the PC5 reference point, using protocols specified in 3GPP technical specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If BSM transmission frequency is increased to improve safety communication reliability, then V2V safety communication reliability is improved, but channel congestion increases
Solution Approach 1:
The patent implements dynamic adjustment of BSM transmission parameters including generation interval and transmit power based on real-time channel conditions and vehicle density. The system transitions from fixed periodic transmission to adaptive dynamic transmission, where the communication apparatus continuously monitors channel busy ratio and adjusts transmission characteristics accordingly to maintain reliability while preventing congestion
Solution Approach 2:
The patent changes key transmission parameters including generation interval (adjusting how frequently BSMs are generated), transmit power levels, and resource selection based on channel conditions. By dynamically modifying these parameters rather than using fixed values, the system optimizes the balance between communication reliability and channel congestion prevention
2Reliability
If BSM transmission power is increased to improve message reception quality, then communication reliability is improved, but energy consumption increases and interference to other vehicles increases
Solution Approach 1:
The patent dynamically adjusts transmit power as a variable parameter based on channel conditions and vehicle density rather than using fixed high power. The system selects appropriate power levels from available resources, reducing energy consumption when high power is not necessary for reliable communication
Solution Approach 2:
The system uses feedback from channel condition monitoring and received signal quality to adjust transmit power levels. By continuously monitoring the communication environment and adapting power output accordingly, the system maintains reliable reception while minimizing unnecessary energy consumption and interference to other vehicles
3Speed
If BSM generation interval is decreased to improve real-time communication, then communication speed is improved, but channel congestion increases
Solution Approach 1:
The patent implements dynamic adjustment of the BSM generation interval based on real-time vehicle density and channel conditions. Rather than using a fixed short interval, the system adapts the generation interval dynamically - using shorter intervals when channel conditions permit and longer intervals when congestion is detected, thereby maintaining real-time communication capability while preventing channel saturation
Data Source
AI summary
A method performed by a communication apparatus according to an aspect of the present disclosure includes calculating (400, 530) a generation interval and transmit power of a basic safety message used for Vehicle-to-Vehicle, V2V, safety communication, based on a channel busy ratio which is a ratio of time during which a channel is busy and on vehicle density within a predetermined range, and transmitting (500), based on the generation interval and the transmit power, the basic safety message over a PC5 reference point specified in a technical specification of the 3rd Generation Partnership Project, 3GPP.