Date Added: Jan 2011
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.