Issues of Routing IN VANET

ABSTRACT

Vehicular Ad Hoc Network (VANET) is a sub class of mobile ad hoc networks. VANET provides wireless communication among vehicles and vehicle to road side equipments. The communication between vehicles is used for safety, comfort and for entertainment as well. The performance of communication depends on how better the routing takes place in the network. Routing of data depends on the routing protocols being used in network. In this study different ad hoc routing protocols for VANET are studied. The main aim of this study is to identify which ad hoc routing method has better performance in highly mobile environment of VANET. To measure the performance of routing protocols in VANET, two different scenarios i.e. city and highway are considered. Routing protocols were selected carefully after carrying out literature review. The selected protocols were then evaluated through simulation in terms of performance metrics i.e. throughput and packet drop. After simulation results, MATLAB can be used to plot the graph to compare the results of selected routing protocols with each other.

From the results, it is observed that A-STAR shows better performance in terms of high throughput and low packet drop as compared to AODV and GPSR in city environment, while GPSR shows better performance as compared to AODV in both highway and city environment of VANET. Based on the results of performance metrics in different environments of VANET, it is realized that position based routing method of VANET outperformed the traditional ad hoc topology based routing. In VANET the protocol performance depends on vehicle speed, driving environment etc. that may vary from one environment of network to another.

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Dynamic E-Business

ABSTRACT


Purpose with this article was to provide a cohesive overview of the technical landscape, commonly referred to in the industry as Web services, and to add some clarity to dynamic e-business. We started at the thirty thousand foot level with a vision of dynamic e-business. We then descended down through a common architecture (SOA) and proceeded by outlining a set of open enabling technologies. Finally, we landed on the notion of a reusable and network-accessible software asset, a Web service. Armed with the necessary tooling and products to create, deploy, and host Web services, businesses can attack the integration and infrastructure complexities of B2B and achieve the vision of dynamic e-business.

As businesses seek to embrace the technologies of dynamic e-business, they must be able to associate their business with specific a SOA role. In most cases they will also need to provide a justification of for their adoption of the technology from a business perspective. In this article we declared five different SOA roles for a business and provided an two categories of business reasons to adopt the technology.



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