13-11-2012, 02:19 PM
Acknowledgment- Based Broadcast Protocol for Reliable and Efficient Data Dissemination in Vehicular Ad Hoc Networks
ABSTRACT
We propose a broadcast algorithm suitable for a wide
range of vehicular scenarios, which only employs
local information acquired via periodic beacon
messages, containing acknowledgments of the
circulated broadcast messages. Each vehicle decides
whether it belongs to a connected dominating set
(CDS). Vehicles in the CDS use a shorter waiting
period before possible retransmission. At time-out
expiration, a vehicle retransmits if it is aware of at
least one neighbor in need of the message. To address
intermittent connectivity and appearance of new
neighbors, the evaluation timer can be restarted. Our
algorithm resolves propagation at road intersections
without any need to even recognize intersections. It is
inherently adaptable to different mobility regimes,
without the need to classify network or vehicle speeds.
In a thorough simulation-based performance
evaluation, our algorithm is shown to provide higher
reliability and message efficiency than existing
approaches for non safety applications.