Vehicular Technology 1 A Framework for

Secure and

Efficient Data

Acquisition in

Vehicular Ad Hoc

Networks

Intervehicular communication lies at the core of a number of industry and academic research

initiatives that aim at enhancing the safety and efficiency of transportation systems. Vehicular

ad hoc networks (VANETs) enable vehicles to communicate with each other and with

roadside units (RSUs). Service-oriented vehicular networks are special types of VANETs that

support diverse infrastructure-based commercial services, including Internet access, real-time

traffic management, video streaming, and content distribution. Many forms of attacks against

service-oriented VANETs that attempt to threaten their security have emerged. The success of

data acquisition and delivery systems depends on their ability to defend against the different

types of security and privacy attacks that exist in service-oriented VANETs. This paper

introduces a system that takes advantage of the RSUs that are connected to the Internet and

that provide various types of information to VANET users. We provide a suite of novel

security and privacy mechanisms in our proposed system and evaluate its performance using

the ns2 software. We show, by comparing its results to those of another system, its feasibility

and efficiency.

Vehicular

Technology

2013

2 VMaSC:

Vehicular multi-

hop algorithm for

stable clustering in

Vehicular Ad Hoc

Networks

Clustering is an effective mechanism to handle the fast changes in the topology of vehicular

ad hocnetworks (VANET) by using local coordination. Constructing stable clusters by

determining the vehicles sharing similar mobility pattern is essential in reducing the overhead

of clustering algorithms. In this paper, we introduce VMaSC: Vehicular Multi-hop algorithm

for Stable Clustering. VMaSC is a novelclustering technique based on choosing the node with

the least mobility calculated as a function of the speed difference between neighboring nodes

as the cluster head through multiple hops. Extensive simulation experiments performed using

ns-3 with the vehicle mobility input from the Simulation of Urban Mobility (SUMO)

demonstrate that novel metric used in the evaluation of the least mobile node and multi-hop

clustering increases cluster head duration by 25% while decreasing the number of clusterhead

changes by 10%.

VANET 2013

3 BAHG: Back-

Bone-Assisted

Hop Greedy

Routing

for VANET’s City

Environments

Using advanced wireless local area network technologies, vehicular ad hoc networks

(VANETs) have become viable and valuable for their wide variety of novel applications, such

as road safety, multimedia content sharing, commerce on wheels, etc. Multihop information

dissemination in VANETs is constrained by the high mobility of vehicles and the frequent

disconnections. Currently, geographic routing protocols are widely adopted for VANETs as

they do not require route construction and route maintenance phases. Again, with connectivity

awareness, they perform well in terms of reliable delivery. To obtain destination position,

some protocols use flooding, which can be detrimental in city environments. Further, in the

case of sparse and void regions, frequent use of the recovery strategy elevates hop count.

Some geographic routing protocols adopt the minimum weighted algorithm based on distance

or connectivity to select intermediate intersections. However, the shortest path or the path

with higher connectivity may include numerous intermediate intersections. As a result, these

protocols yield routing paths with higher hop count. In this paper, we propose a hop greedy

routing scheme that yields a routing path with the minimum number of intermediate

intersection nodes while taking connectivity into consideration. Moreover, we introduce back-

bone nodes that play a key role in providing connectivity status around an intersection. Apart

from this, by tracking the movement of source as well as destination, the back-bone nodes

enable a packet to be forwarded in the changed direction. Simulation results signify the

benefits of the proposed routing strategy in terms of high packet delivery ratio and shorter

end-to-end delay.

VANET 2013

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NS2 – 2013

(Mobile Computing, Wireless Sensor Network, Vanet, Ad-Hoc Network, Mesh Network, Parallel & Distributed

System)