Study of connectivity in vehicular ad hoc networks

Yousefi, Saleh; Altaian, E.; El-Azouzi, Rachid

doi:10.1109/wiopt.2007.4480082

Cited by 9 publications

(9 citation statements)

References 14 publications

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“…A number of previous articles have proposed methods to calculate the connectivity in different street segments in the roadmap, i.e., the probability that the distances between any two adjacent vehicles in a street segment are smaller than the transmission ranges of vehicles [30][31][32]. However, all these studies use a macroscopic approach for calculating the connectivity.…”

Section: Route Connectivitymentioning

confidence: 99%

“…A common assumption in vehicular traffic engineering theory is to consider a normal distribution for the speeds of vehicles in every street [32,33]. For each street the minimum and maximum allowable speeds to be included in the normal distribution of that street are available in the digital map.…”

Section: Route Connectivitymentioning

confidence: 99%

“…The fixed speed is randomly selected according to the normal distribution of the street. On the other hand, it is widely accepted that in free-flow conditions, in which streets are not congested and vehicles can move as fast as they want, any fixed point on the roadside observes Poisson arrivals of vehicles [31,32,34]. Hence, since vehicles are supposed to move at fixed speeds, they also observe Poisson arrivals of other vehicles in their transmission ranges.…”

Section: Route Connectivitymentioning

confidence: 99%

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Hybrid multi-technology routing in heterogeneous vehicular networks

Shafiee

Leung

2012

J Wireless Com Network

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Recent developments of wireless communication systems have resulted in the availability of heterogeneous access networks at any geographic area. To make use of this heterogeneous environment for vehicular users to access the Internet, in this article we propose a hybrid multi-technology routing (HMTR) protocol for multihop vehicular networks. HMTR takes into account different combinations of wireless technologies in intermediate hops and is generally formed of a combination of topology-based and position-based routing schemes for packet forwarding. For a given packet, HMTR uses the position-based routing approach over highly variable links whose lifetimes are shorter than the packet expiry time. On the other hand, it employs the topology-based routing approach over more stable links that are expected to stay valid before the expiry time of the packet. Among the candidate routes, any route which does not meet the user requirements in terms of budget or quality of service metrics such as delay and bandwidth is ruled out first. Then, among the remained candidates those with adequate levels of connectivity are assessed for their appropriateness in terms of network utilizations, which are of the network's concern and connection costs, which are of users' concern. Simulation results show that HMTR enables us to achieve the best possible performance in terms of delivery ratio and delivery delay for a given budget, whereas in pure position-based or pure topology-based routing schemes sacrificing the performance or budget may be inevitable in many scenarios.

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Section: Route Connectivitymentioning

confidence: 99%

Section: Route Connectivitymentioning

confidence: 99%

Section: Route Connectivitymentioning

confidence: 99%

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Hybrid multi-technology routing in heterogeneous vehicular networks

Shafiee

Leung

2012

J Wireless Com Network

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“…In the first one, studies mainly address VANET issues, such as VANET connectivity, data dissemination protocol and routing techniques, MAC scheduling, etc., [8]- [10], based on an existing platoon. In the second category, most studies are about the traffic dynamics control and performance optimization by managing and controlling platoons [1], [11]- [25], with the help of an existing VANET.…”

Section: Introductionmentioning

confidence: 99%

A Disturbance-Adaptive Design for VANET-Enabled Vehicle Platoon

Jia

Wang

2014

IEEE Trans. Veh. Technol.

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Abstract-In highway systems, grouping vehicles into platoons can improve road capacity and energy efficiency. With the advance of technologies, the performance of platoons can be further enhanced by vehicular ad-hoc network (VANET). In the past few years, many studies have been conducted on the dynamics of VANET-enabled platoon under traffic disturbance, which is a common scenario on a highway. However, most of them do not consider the impact of platoon dynamics on the behaviors of VANET. Moreover, most existing studies focus on how to maintain the stability of a platoon, and do not address how to mitigate negative effects of traffic disturbance, such as uncomfortable passenger experience, increased fuel consumption, and increased exhaust emission. In this paper, we will investigate the dynamics of VANET-enabled platoon from an integrated perspective. In particular, we first propose a novel disturbanceadaptive platoon (DA-Platoon) architecture, in which a platoon controller shall adapt to the disturbance scenario and shall consider both VANET and platoon dynamics requirements. Based on a specific realization of the DA-Platoon architecture, we then analyze the traffic dynamics inside a platoon and derive desired parameters, including intra-platoon spacing and platoon size, so as to satisfy VANET constraints under traffic disturbance. To mitigate the adverse effects of traffic disturbance, we also design a novel driving strategy for the leading vehicle of platoon, with which we can determine the desired inter-platoon spacing. Finally, we conduct extensive simulation experiments, which not only validate our analysis but also demonstrate the effectiveness of the proposed driving strategy.Index Terms-Vehicle platoon, traffic disturbance, vehicular ad-hoc networks (VANET), platoon dynamics, platoon parameters, driving strategy, disturbance-adaptive platoon (DA-Platoon), Intelligent Driver Model (IDM).

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“…Connectivity in VANETs may become poor in some roads, dependent on the traffic flow and vehicls' speed distribution [10]. Since traffic state and speed are not under control of the network and application designer, one possible way to improve the connectivity in this kind of networks is to add some nodes with higher transmission range, named mobile base-stations.…”

Section: Introductionmentioning

confidence: 99%

Connectivity in vehicular ad hoc networks in presence wireless mobile base-stations

Yousefi

Altmaiv

El-Azouzi

2007

2007 7th International Conference on ITS Telecommunications

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Connectivity in vehicular ad hoc networks tends to be vulnerable. This is mostly because of the influence of road's traffic parameters like traffic flow and vehicle's speed. One possible way to improve the connectivity is to add some nodes with higher transmission range. These nodes also could give some commercial services to the vehicles on roads (i.e. audio/video service, traffic information, etc.). In this paper we study the connectivity in presence of these nodes which we call mobile base-stations. Our approach is based on the work of Miorandi and Altman [11] that transformed the problem of connectivity distance distribution into that of the distribution of the busy period of an equivalent infinite server queue. We study the effects of mobile base-stations on the connectivity distance and number of nodes in a spatial cluster (platoon). In our investigation we use some publicly available statistical data and realistic traffic patterns. Our model can be used to obtain optimum values for number of base-stations and their transmission range in order to achieve intended degree of connectivity.

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Study of connectivity in vehicular ad hoc networks

Cited by 9 publications

References 14 publications

Hybrid multi-technology routing in heterogeneous vehicular networks

Hybrid multi-technology routing in heterogeneous vehicular networks

A Disturbance-Adaptive Design for VANET-Enabled Vehicle Platoon

Connectivity in vehicular ad hoc networks in presence wireless mobile base-stations

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