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In Vehicular Ad hoc NETworks (VANETs), traditional routing protocols are mainly based on planar scenarios. However, the actual application environments of VANETs are three-dimensional (3-D). For example, an important way to fully utilize the city space is the elevated overpass which is popular in most big cities. In this paper, we investigate the routing issues in 3-D scenarios of VANETs. We first...
With the rapid development of new applications and services in vehicular environment, there is an increasing demand for mobile users to access data items. Moreover, Road Side Unit (RSU) has been introduced by researchers to facilitate data dissemination in Vehicular Ad-hoc Networks (VANETs). Therefore, it is necessary to design a data access scheme for vehicle-to-roadside (V2R) communications. However,...
The precise spatio-temporal position data of vehicles is useful for most studies, such as wireless link lifetime and node degree in vehicular ad hoc networks. However, due to the system errors and random errors, the existing Global Positioning System (GPS) only provides the positional accuracy about 10m or even worse. In this paper, to address the issue of positional accuracy, a Clustering and Approximating...
Collision on road is a classic and important problem as it brings about great loss on humans' safety and the efficiency of the traffic system. Numerous algorithms have been proposed to address the issue, and most of the existing researches are focused on rear-end, overtaking and lane change scenarios. However, due to the massive computing process, limitation of prediction time and complex layouts...
Traffic congestion has seriously hindered the healthy and sustainable development of economy and society. Many research have been done to address the issue. Intelligent Transportation System (ITS) is key to improve the performance of urban traffic. As one of the essential components of an ITS, green ITS navigation for people and freight is critical, its research must base on the accurate grasp of...
Mobility models play a vital role in Vehicular Ad Hoc Networks (VANETs) simulations. Moreover, mobility models with higher extent of reality to fit into the characteristics of VANETs better make simulations more credible and accurate. However, most of traditional mobility models only devote to planar and ideal scenarios. It is rare for them to reflect more realistic environments, such as ubiquitous...
As is known, the intersection-based geographic routing protocol is a promising solution to the information dissemination in realistic city environments. Also, there exists a series of special issues for VANETs urban area. Aiming to tackle these issues, many such routing protocols have been proposed in academia. In this paper, we present four important issues for city scenarios which not only strongly...
Due to the existence of three-dimensional (3D) scenarios in realistic Vehicular Ad hoc Network (VANET), such as the viaduct, tunnel and ramp, the distribution of vehicles is 3D. To the best of our knowledge, the issue of designing a routing protocol for 3D VANET has rarely been studied. Our previous work [10] has provided a Three-dimensional scenario oriented Routing (TDR) for the simple 3D scenario...
Greedy forwarding is widely adopted in geographic routing protocols for VANETs since it selects the neighbor that is geographically closer to the destination as the next hop and is considered efficient. Because of the highly dynamic network topology and various impairment of radio signal, the link chosen according to the greedy algorithm regardless of the link state is unstable to a large extent,...
Vehicular ad hoc network (VANET) is suffering from intermittent connectivity problems due to vehicles mobility, which challenge routing protocols. To address the issue, we propose a novel strategy called Reactive Pseudo-suboptimal-path Selection routing protocol (RPS). It is different from existing solutions which rely on vehicles physical movement to carry packets in intermittent connectivity scenarios...
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