Abstract
This paper presents Direction based Hazard Routing Protocol (DHRP) for disseminating information about fixed road hazards such as road blocks, tree fall, boulders on road, snow pile up, landslide, road maintenance work and other obstacles to the vehicles approaching the hazardous location. The proposed work focuses on dissemination of hazard messages on highways with sparse traffic. The vehicle coming across the hazard would report the presence of the hazard. It is proposed to use Road Side fixed infrastructure Units for reliable and timely delivery of hazard messages to vehicles. The vehicles can then take appropriate safety action to avoid the hazardous location. The proposed protocol has been implemented and tested using SUMO simulator to generate road traffic and NS 2.33 network simulator to analyze the performance of DHRP. The performance of the proposed protocol was also compared with simple flooding protocol and the results are presented.
Highlights
Vehicular ad hoc network (VANET) is an emerging technology for Intelligent Transportation Systems (ITS)
This paper focuses on transmission of fixed road hazard messages in highways with the use of smart Road Side Units (RSUs)
DHRP protocol description We extend our earlier work to propose and present a Direction based Hazard Routing Protocol (DHRP) for delivering road hazard information to the vehicles travelling on highways (Berlin and Sheila 2012)
Summary
Vehicular ad hoc network (VANET) is an emerging technology for Intelligent Transportation Systems (ITS). Songnan Bai et al have presented a Vehicular Multi-hop broadcast Protocol (VMP) for the dissemination of safety messages using other vehicles as forwarder nodes based on the neighboring information received by hello messages (Songnan et al 2009). RSUs deployed on highways can act as forwarder nodes to transmit hazard related messages to the vehicles moving in the direction of the located hazard. The information in ‘T’ would be used for processing of the hazard messages received from the vehicles as explained later Since this proposed work considered sparse traffic on highways, it would be possible for RSUs to update and maintain the vehicle information in the table ‘T’. The protocol is further explained by considering the scenario given in Figure 2 where the highway is a straight road with two lanes and vehicles travelling in the forward and opposite directions. Vehicles travelling in the west bound direction would transmit the hazard message to RSU3 which in turn would transmit to other RSUs towards east
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