Network packet

Broadcasting (networking)

Dissemination

Wireless ad hoc network

Telecommunications

Computer science

Protocol (science)

Mobile ad hoc network

Distributed computing

Computer network

Optimized Link State Routing Protocol

Alternative medicine

Latency (audio)

Vehicular ad hoc network

Medicine

Wireless

Ad hoc wireless distribution service

Pathology

IEEE Internet of Things Journal

Vehicular ad hoc networks (VANETs) can help reduce traffic accidents through broadcasting emergency messages among vehicles in advance. However, it is a great challenge to timely deliver the emergency messages to the right vehicles which are interested in them. Some protocols require to collect nearby real-time information before broadcasting a message, which may result in an increased delivery latency. In this paper, we proposed an improved position-based protocol to disseminate emergency messages among a large scale vehicle networks. Specifically, defined by the proposed protocol, messages are only broadcasted along their regions of interest, and a rebroadcast of a message depends on the information including in the message it has received. The simulation results demonstrate that the proposed protocol can reduce unnecessary rebroadcasts considerably, and the collisions of broadcast can be effectively mitigated.

A Distributed Position-Based Protocol for Emergency Messages Broadcasting in Vehicular Ad Hoc Networks