Dynamic Priority Scheduling Mechanism Based on Spatio-Temporal Correlation for VANETs

Abstract

A dynamic priority scheduling scheme is conceived for the safety messages of vehicular ad-hoc networks (VANETs). The priority of a message is dynamically adjusted for satisfying the specific VANETs safety requirements. A spatio-temporal correlation function based on the message-priority is developed, which monotonically decreases as the transmission range and the transmission duration increasing. Additionally, the spreading of a message is limited to the dynamic life-span and spatial area. Our simulations demonstrate that the proposed scheduling scheme is capable of significantly reducing the network's duplicated teletraffic when the vehicular density is high, whilst improving the achievable transmission range in the low vehicular density.