562 research outputs found
DEMO: Simulation of Realistic Mobility Model and Implementation of 802.11p (DSRC) for Vehicular Networks (VANET)
An ad hoc network of vehicles (VANET) consists of vehicles that exchange
information via radio in order to improve road safety, traffic management and
do better distribution of traffic load in time and space. Along with this it
allows Internet access for passengers and users of vehicles. A significant
characteristic while studying VANETs is the requirement of having a mobility
model that gives aspects of real vehicular traffic. These scenarios play an
important role in performance of VANETs. In our paper we have demonstration and
description of generating realistic mobility model using various tools such as
eWorld, OpenStreetMap, SUMO and TraNS. Generated mobility scenario is added to
NS-2.34 (Network Simulator) for analysis of DSR and AODV routing protocol under
802.11p (DSRC/WAVE) and 802.11a. Results after analysis shows 802.11p is more
suitable than 802.11a for VANET.Comment: 4 pages, 6 figures, International Journal of Computer Applicatio
Hybrid-Vehcloud: An Obstacle Shadowing Approach for VANETs in Urban Environment
Routing of messages in Vehicular Ad-hoc Networks (VANETs) is challenging due
to obstacle shadowing regions with high vehicle densities, which leads to
frequent disconnection problems and blocks radio wave propagation between
vehicles. Previous researchers used multi-hop, vehicular cloud or roadside
infrastructures to solve the routing issue among the vehicles, but they suffer
from significant packet delays and frequent packet losses arising from obstacle
shadowing. We proposed a vehicular cloud based hybrid technique called
Hybrid-Vehcloud to disseminate messages in obstacle shadowing regions, and
multi-hop technique to disseminate messages in non-obstacle shadowing regions.
The novelty of our approach lies in the fact that our proposed technique
dynamically adapts between obstacle shadowing and non-obstacle shadowing
regions. Simulation based performance analysis of Hybrid-Vehcloud showed
improved performance over Cloud-assisted Message Downlink Dissemination Scheme
(CMDS), Cross-Layer Broadcast Protocol (CLBP) and Cloud-VANET schemes at high
vehicle densities
DFCV: A Novel Approach for Message Dissemination in Connected Vehicles using Dynamic Fog
Vehicular Ad-hoc Network (VANET) has emerged as a promising solution for
enhancing road safety. Routing of messages in VANET is challenging due to
packet delays arising from high mobility of vehicles, frequently changing
topology, and high density of vehicles, leading to frequent route breakages and
packet losses. Previous researchers have used either mobility in vehicular fog
computing or cloud computing to solve the routing issue, but they suffer from
large packet delays and frequent packet losses. We propose Dynamic Fog for
Connected Vehicles (DFCV), a fog computing based scheme which dynamically
creates, increments and destroys fog nodes depending on the communication
needs. The novelty of DFCV lies in providing lower delays and guaranteed
message delivery at high vehicular densities. Simulations were conducted using
hybrid simulation consisting of ns-2, SUMO, and Cloudsim. Results show that
DFCV ensures efficient resource utilization, lower packet delays and losses at
high vehicle densities
Hybrid-Vehfog: A Robust Approach for Reliable Dissemination of Critical Messages in Connected Vehicles
Vehicular Ad-hoc Networks (VANET) enable efficient communication between
vehicles with the aim of improving road safety. However, the growing number of
vehicles in dense regions and obstacle shadowing regions like Manhattan and
other downtown areas leads to frequent disconnection problems resulting in
disrupted radio wave propagation between vehicles. To address this issue and to
transmit critical messages between vehicles and drones deployed from service
vehicles to overcome road incidents and obstacles, we proposed a hybrid
technique based on fog computing called Hybrid-Vehfog to disseminate messages
in obstacle shadowing regions, and multi-hop technique to disseminate messages
in non-obstacle shadowing regions. Our proposed algorithm dynamically adapts to
changes in an environment and benefits in efficiency with robust drone
deployment capability as needed. Performance of Hybrid-Vehfog is carried out in
Network Simulator (NS-2) and Simulation of Urban Mobility (SUMO) simulators.
The results showed that Hybrid-Vehfog outperformed Cloud-assisted Message
Downlink Dissemination Scheme (CMDS), Cross-Layer Broadcast Protocol (CLBP),
PEer-to-Peer protocol for Allocated REsource (PrEPARE), Fog-Named Data
Networking (NDN) with mobility, and flooding schemes at all vehicle densities
and simulation times
Towards a comparable evaluation for VANET protocols: NS-2 experiments builder assistant and extensible test bed
Proceedings of: 9th Embedded Security in Cars Conference (ESCAR 2011), November 9 to 10, 2011, Dresden, GermanyIn order to validate an Intelligent Transportation System (ITS) application or service, simulation techniques are usually employed. Nowadays, there are two problems associated to this kind of validation: the relative complexity of existing simulators and the lack of common criteria in the creation of simulation experiments. The first one makes it hard for users not familiar with a simulation tool to create and execute comprehensive experiments. The second one leads to a situation in which different proposals are validated in different scenarios, thus making it difficult to compare their performance. This work contributes on addressing both problems by proposing VanSimFM, an open-source assistant tool for creating NS-2 simulation experiments, and by defining an extensible test bed which contains a set of simulation scenarios. The test bed is intended to represent the different situations that may be found in a real vehicular environment.This work is partially supported by Ministerio de Ciencia e Innovacion of Spain, project E-SAVE, under grant TIN2009-13461.No publicad
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