Algorithm for Transmission Rate and Range Control for Cooperative Vehicle Safety Communication in Vehicular Ad-Hoc Networks

University of California System: University of California, Berkeley
posted on 02/02/2010

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Vehicular Ad-Hoc networks (VANETs) play a critical role in enabling important active safety applications such as cooperative collision warning. These active safety applications rely on continuous broadcast of self-information by all vehicles, which allows each vehicle to track all its neighboring cars in real-time. The most pressing challenge in such safety-driven communication is to maintain acceptable tracking accuracy while avoiding congestion in the shared channel.
 
Investigators at University of California at Berkeley have developed a transmission control algorithm that adapts communication rate and power based on the dynamics of vehicular network and safety-driven tracking process. The innovative transmission rate and range control  solution uses a closed-loop control concept and accounts for wireless channel unreliability.  Simulation results confirm that if packet generation rate and associated transmission power forsafety messages are adjusted in an on-demand and adaptive fashion, robust tracking is possible  under various traffic conditions.  Verifying the robustness of the algorithm, the investigators observed its tracking performance in various traffic scenarios. Simulation results confirm that the innovative design is robust and can considerably reduce the tracking error compared to that of the de-facto solution (beaconing with 100-millisecond interval).

• Cooperative Collision Warning (CCW)
• Electronic Emergency Brake Light (EEBL)
• Slow/Stopped Vehicle Alert (SVA)

• on-demand, adaptive packet generation rate & transmission power
• considerably reduces the tracking error
• DSRC (Dedicated Short Range Communication) compatible
• WAVE (Wireless Access for Vehicular Environments compatible