| Vehicular Ad Hoc Networks (VANET), which is composed of road-side infrastructuresand vehicles equipped with wireless communication devices, is a new type of mobile ad hocnetworks. In this type of networks, every node communicating with each other throughunicast, broadcast, multi-hop forward can provide application about traffic safety, efficientdriving and entertainment, which is in order to improve security on roads and achievecomfortable and efficient driving. Study of VANET has become a hot research point inintelligent transportation field gradually. According to the characteristics of VANET,designing efficient, adaptive routing protocols is a very important research focus.This paper analyzes the key mechanism of VANET position-based routing protocols andpoints out the existing defects of these protocols, which are a focus in current VANET routingprotocols research.Traffic lights have a negligible impact on vehicle movement. This paper establishes aRelated Traffic Light mobility model (RTL) to analyze the impact of traffic lights on urbantraffic flow, and utilize improve Manhattan mobility to validate and analyze the influence oftraffic lights on road connectivity through a simulation.According to the lack of location-based routing protocols and the influence of trafficlights for road connectivity, this paper presents a Traffic-light-oriented road ConnectivityAware Routing (TCAR) with three parts: sections connectivity perceptual, macro greedyselection and micro greedy forwarding. TCAR well adapts to VANET, effectively deal withlocal optimization phenomena and the lack of road connectivity aware, at the same time, theprotocol takes full account of the impact of traffic lights.At last, this paper utilizes simulation to validate TCAR in scenes of different number anddifferent speed of vehicles. The simulation shows that network performance of TCAR isbetter than other existing position-based routing protocols and can adjust large-scale VANETin urban traffic. |
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