TR2009-065

Receive Power-Based Prioritized Rebroadcasting for V2V Safety Message Dissemination



Rapidly and robustly disseminating safety messages is an important goal for vehicle-to-vehicle communications. When multiple vehicles receive an alert message, packet collisions may occur if they rebroadcast the message simultaneously. Due to the broadcast nature of safety messages, acknowledgement on the reception of packets is difficult, and such collision leads to non-recoverable failed delivery. The proposed Receive Power-Based Prioritized Rebroadcast (RPPR) scheme (1) minimizes the probability of packet collision during rebroadcast, and (2) maximizes the probability that a vehicle that is furthest away from the source rebroadcasts an alert message first. This improves robustness and minimizes the packet delivery time.