Abstract:
Emergency Messages (EMs) broadcast between vehicles via Vehicular Ad hoc Networks (VANETs) can reduce traffic accidents. VANETs’ high mobility and wireless signal attenuation make EM transmission difficult.
The chosen next-hop vehicle may have driven away from the sender’s neighborhood before receiving the EM, and rerouting may delay EM transmission failure. We propose Speed and Position-aware Dynamic Routing (SPDR) for VANET EM dissemination. To rebroadcast the EM hop-by-hop, we use speed metric greedy routing.
SPDR dynamically shrinks the Routing Decision Area (RDA) range based on candidate neighbors’ velocity variance and prioritizes the farthest vehicle as the optimal next-hop, improving EM transmission reliability. We then present a collaborative forwarding strategy for candidate neighbors to communicate.
SPDR chooses the closest vehicle as the forwarder in case of transmission failure to reduce rerouting. SPDR outperforms existing protocols in message delivery ratio, network throughput, and average dissemination delay in NS-2 and VanetMobiSim motorway simulations.
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