Mobility

MAC Performance Analysis for Vehicle-to-Infrastructure Communication

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Executive Summary

The newly emerged vehicular ad hoc network adopts the contention based IEEE 802.11 DCF as its MAC. While it has been extensively studied in the stationary indoor environment (e.g., WLAN), the performance of DCF in the highly mobile vehicular environment is still unclear. On addressing this issue, the authors propose a simple, but accurate analytical model to evaluate the throughput performance of DCF in the high-speed Vehicle-To-Infrastructure (V2I) communications. They unveil the impacts of nodes mobility (velocity and moving directions) on the system throughput. Particularly, they show that with node velocity increasing, the throughput of DCF decreases monotonically, which demonstrates the inefficiency of DCF in the highly mobile environment.

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