Performance Evaluation of Ad Hoc Network over Moving Vehicles in a City

A mobile ad hoc network (MANET) is a collection of wireless mobile nodes that can dynamically form a temporary network without the aid of any existing network infrastructure. Wireless connectivity on vehicles is an important mode of communication. It is more challenging to provide high-bandwidth networking over fast moving vehicles. Ad Hoc network can be formed on fast moving vehicles where the interior node acts as rely node. A dynamic routing protocol is needed for a node to exchange data with another. In this research work, we consider the traffic density of a typical district town where traffic density much lower than a metropolitan city and vehicle speed is regulated according to traffic law. We have studied two routing protocols AODV and DSR in city traffic. According to our study, AODV shows performance than DSR on city roa

Towards a microscopic traffic simulation framework to assess vehicle-to-vehicle networks

This paper presents the specification of a framework based on the concept of service-oriented architectures (SOA) to support the assessment of vehicular ad-hoc networks (VANET). A preliminary study of concepts related to SOA was carried out, as well as of those technologies that allow real-time data acquisition and dissemination within urban environments, and simulation tools to aid the simulation of the VANET. The requirements for our simulation framework were identified and a two-layered architecture was specified, which rely on the abstraction levels of services for vehicle-to-vehicle (V2V) communication. A prototypical application was implemented, which was used to demonstrate the feasibility of the approach presented through experimental results

Assignment of dynamic transmission range based on estimation of vehicle density

Vehicular Ad Hoc Networks (VANET) have several characteristics that distinguish them from other ad hoc networks. Among those is the rapid change in topology due to traffic jams, which also disturbs the homogenous distribution of vehicles on the road. For this reason, a dynamic transmission range is more effective in maintaining connectivity while minimizing the adverse effects of a high transmission power. We provide a relationship that allows vehicles to estimate the local density and distinguish between two phases of traffic, freeflow and congested traffic. The density estimate is used to develop an algorithm that sets a vehicle transmission range dynamically according to local traffic conditions. Simulations of various road configurations show that the algorithm is successful in maintaining connectivity in highly dynamic networks

Virtual Access Points for Vehicular Networks

ABSTRACT This paper introduces the concept of Virtual Access Points (VAPs) for wireless Vehicular Ad-hoc Networks (VANETS). This new technique allows data dissemination among vehicles, thus extending the reach of roadside access points to uncovered road areas. Each vehicle that receives a message from an Access Point (AP) stores this message and rebroadcasts it into non covered areas. This extends the network coverage for non time critical messages. The VAP role is transparent to the connected nodes, and designed to avoid interference since each operates on a bounded region outside any AP. The experiments show the presented mechanism of store and forward at specific positions present a gain, in term of all the evaluated parameters

Simulating communication in a service-oriented architecture for V2V networks

A framework based on the concept of service-oriented architectures (SOA) to Support the assessment of vehicular ad-hoc networks (VANET) is herein presented. Concepts related to SOA, as well as technologies that allow real-time data acquisition and dissemination within urban environments, and simulation tools to aid the simulation of VANET were preliminarily Studied. A two-layered architecture wits specified oil the basis of the requirements for our simulation framework resulting in the specification of a multi-agent system formed of vehicle entities that are able to communicate and interact with each other and with their surrounding environment as well. A prototypical application was implemented, which Was used to demonstrate the feasibility of the approach presented through experimental results

Power - Aware Resource Management for Sensor - Actor Networks

Mobile sensor actuator networks have been applied in a wide range of real-world applications. Because nodes in sensor networks are powered by batteries, two major problems arise. First, the nodes do not last long because of limited power supply. Second, only limited amount of data can be transferred if proper mobility strategies are not designed. In this research, we propose the concept of pipelining of mobile nodes to asynchronously transfer and relay data in the network. Through a number of simulations we examine the design tradeoff of performance and energy cost. Performance evaluation through simulations has been conducted by number of mobile nodes. The proposed pipelining strategy yields three major benefits. First, as the number of mobile nodes increases, rate of data transfer increases. Second, energy required per data transfer decreases. Finally, life time of the network increases compared to traditional non-pipelining mobility strategy.Computer Science Departmen