Cache-Based Routing for Vehicular Ad Hoc Networks in City Environments

Abstract

Most of routing protocols in VANETs are position-based due to their well scalability. The forwarding decisions of such protocols are simply based on the location information of forwarders' neighborhood and the destination node. Due to high mobility of vehicles, location-service protocols are required to provide the destination location. Location services protocols can be categorized as flooding-based and quorum-based. They are unrealistic for VANETs. In the former approaches, global network flooding require extreme high cost, while in the latter approaches, quorums' hand-off is impossible because of high volume of exchange data. In this paper, we present a routing by utilizing locality of vehicles' traces (i.e ., left location information). Besides, by the aid of high mobility of vehicles and news exchange (new information about vehicles' location), vehicles' location information can be spread to improve the possibility of meeting a vehicle which has the location information of the destination. Our protocol is realisticand practical because neither global network flooding nor quorums are required. The simulation results show that our protocol works efficiently for VANETs in city environments and has higher successful query rate and lower cost.

A Review on VANET Research: Perspective of Recent Emerging Technologies

“…The transmission of IoV data between vehicles and spine-connected bodies, such as distant Internet servers or peers, is accomplished mostly via pullbased approaches. To minimize the latency [56] of pullbased methods, statistics caching is frequently implemented to increase the statistic distribution productivity by storing the necessary information in infrastructure [57] near vehicle consumers [58].…”

Intersection-Based Routing Protocol for VANETs

“…To improve the performance of routing protocols in VANETs, path decisions with regard to routing protocols is based on some crucial factors, such as the direction of vehicles [23], vehicle density [24], and locality of vehicles trace [25]. If the moving direction of the next relay vehicle differs from the transfer direction of packet routing, then reverse direction forwarding contributes to a long end-to-end delay and high packet loss ratio, especially for sparse traffic road segments of VANETs.…”