Adaptive intervehicle communication control for cooperative safety systems
Vehicular ad hoc networks 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. In this article we propose a transmission control protocol that adapts communication rate and power based on the dynamics of a vehicular network and safety driven tracking process. The proposed 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 for safety messages are adjusted in an on demand and adaptive fashion, robust tracking is possible under various traffic conditions.
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