Efficiency and Reliability of One-Hop Broadcasting in Vehicular Ad Hoc Networks
In Dedicated Short Range Communications (DSRC) based vehicular networking, each vehicle periodically broadcasts control updates (That contain location and speed information etc.) to its neighbors, as a key component of traffic management and safety applications. The effectiveness of such a broadcast feature can be measured by two metrics: the efficiency or the average rate (Number of nodes per sec) to which a source can deliver its broadcast packets, and the reliability, or the average number of nodes that receive a specific transmission successfully. The authors demonstrate theoretical limits to and achievable tradeoffs between efficiency and reliability for a linear network under Rayleigh fading links. They then provide power control and congestion control strategies that maximize broadcast efficiency.