Topic
Ad hoc wireless distribution service
About: Ad hoc wireless distribution service is a research topic. Over the lifetime, 17734 publications have been published within this topic receiving 488205 citations.
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TL;DR: This paper explores the design choices made in the development of clustering algorithms targeted at VANETs and presents a taxonomy of the techniques applied to solve the problems of cluster head election, cluster affiliation, and cluster management, and identifies new directions and recent trends in the design of these algorithms.
Abstract: A vehicular ad hoc network (VANET) is a mobile ad hoc network in which network nodes are vehicles—most commonly road vehicles. VANETs present a unique range of challenges and opportunities for routing protocols due to the semi-organized nature of vehicular movements subject to the constraints of road geometry and rules, and the obstacles which limit physical connectivity in urban environments. In particular, the problems of routing protocol reliability and scalability across large urban VANETs are currently the subject of intense research. Clustering can be used to improve routing scalability and reliability in VANETs, as it results in the distributed formation of hierarchical network structures by grouping vehicles together based on correlated spatial distribution and relative velocity. In addition to the benefits to routing, these groups can serve as the foundation for accident or congestion detection, information dissemination and entertainment applications. This paper explores the design choices made in the development of clustering algorithms targeted at VANETs. It presents a taxonomy of the techniques applied to solve the problems of cluster head election, cluster affiliation, and cluster management, and identifies new directions and recent trends in the design of these algorithms. Additionally, methodologies for validating clustering performance are reviewed, and a key shortcoming—the lack of realistic vehicular channel modeling—is identified. The importance of a rigorous and standardized performance evaluation regime utilizing realistic vehicular channel models is demonstrated.
379 citations
TL;DR: An overview of different approaches to provide security features to routing protocols in mobile ad hoc networks (MANET) is given and Secure AODV is described giving a summary of its operation and talking about future enhancements to the protocol.
Abstract: This article gives an overview of different approaches to provide security features to routing protocols in mobile ad hoc networks (MANET). It also describes Secure AODV (an extension to AODV that provides security features) giving a summary of its operation and talking about future enhancements to the protocol.
376 citations
TL;DR: This paper analyze the use of on-demand behavior in routing protocols, focusing on its effect on the routing protocol's forwarding latency, overhead cost, and route caching correctness, drawing examples from detailed simulation of the dynamic source routing (DSR) protocol.
Abstract: A number of different routing protocols proposed for use in multihop wireless ad hoc networks are based in whole or in part on what can be described as on-demand behavior. By on-demand behavior, we mean approaches based only on reaction to the offered traffic being handled by the routing protocol. In this paper, we analyze the use of on-demand behavior in such protocols, focusing on its effect on the routing protocol's forwarding latency, overhead cost, and route caching correctness, drawing examples from detailed simulation of the dynamic source routing (DSR) protocol. We study the protocol's behavior and the changes introduced by variations on some of the mechanisms that make up the protocol, examining which mechanisms have the greatest impact and exploring the tradeoffs that exist between them.
375 citations
TL;DR: Performance comparison of AOMDV with AODV using ns-2 simulations under varying node speeds shows that AomDV provides a factor of two improvement in delay and about 20% reduction in routing overhead, while having similar packet delivery fraction.
Abstract: We present AOMDV, an on-demand multipath distance vector protocol for mobile ad hoc networks. AOMDV is based on a prominent on-demand single path protocol called AODV. AOMDV establishes multiple loop-free and link-disjoint paths. Performance comparison of AOMDV with AODV using ns-2 simulations under varying node speeds shows that AOMDV provides a factor of two improvement in delay and about 20% reduction in routing overhead, while having similar packet delivery fraction.
373 citations
TL;DR: This dissertation aims to provide a history of computer science and information engineering in Taiwan from 1989 to 2002, a period chosen in order to explore its roots as well as specific cases up to and including the year of independence from China.
Abstract: 1Department of Electrical Engineering, Chang Gung University, Tao-Yuan, 333, Taiwan 2Department of Computer Science and Information Engineering, National Chiao-Tung University, Hsin-Chu, 300, Taiwan 3Department of Computer Science and Information Engineering, National Central University, Chung-Li, 32054, Taiwan Email: slwu@mail.cgu.edu.tw, yctseng@csie.nctu.edu.tw, neel@csie.ncu.edu.tw, sheujp@csie.ncu.edu.tw
369 citations