Visualização de mobilidade e multihoming em redes sem fios

Engenharia Eletrónica e TelecomunicaçõesNos últimos anos, as pessoas têm-se tornado cada vez mais dependentes do uso de dispositivos móveis pessoais. Desta forma, tornouse indispensável fornecer acesso à Internet aos dispositivos dos utilizadores, em qualquer lugar e em qualquer altura. Estes utilizadores estão em constante movimento, logo a mobilidade apresenta um fator chave nas comunicações nos dias de hoje. A utilização de Hostmultihoming permite que os dispositivos dos utilizadores, que possuam várias interfaces de rede, passam estar ligados simultaneamente a várias redes de acesso. Com esta abordagem é possível aproveitar melhor os recursos que se encontram ao alcance do utilizador e fornecer uma ligação mais fiável. Com a integração de mobilidade e multihoming em redes sem fios é possível satisfazer as exigências cada vez mais elevadas dos utilizadores e oferecer uma melhor experiência de utilização. Com estes mecanismos implementados na rede é agora importante apresentar as suas características e funcionalidades. A forma mais intuitiva e interessante de perceber as mudanças que ocorrem na rede é através de uma plataforma de visualização. Para demonstrar as funcionalidades é necessário interagir com os nós da rede e despoletar remotamente eventos na rede. Estes eventos também devem ser visualizados de modo a perceber as mudanças que ocorrem na rede. O objetivo desta dissertação é desenvolver uma plataforma de visualização capaz de visualizar mobilidade e multihoming na rede, e interagir com a rede para despoletar remotamente eventos na mesma. Para atingir este objetivo, desenvolveu-se e integrou-se uma framework num protocolo de mobilidade com suporte para multihoming. De forma a demonstrar as funcionalidades da plataforma desenvolvida, implementaram-se duas testbeds em ambiente laboratorial, e de seguida realizaram-se testes para verificar as funcionalidades implementadas e o seu desempenho.In the last years we have witnessed that people are becoming increasingly dependent on the use of personal mobile devices. Providing Internet access to users’ devices while maintaining Quality-of-service has become indispensable. The users are constantly moving, and mobility presents a key factor in today’s communications. Host-multihoming allows end-user devices equipped with multiple network interfaces to be simultaneously connected to multiple access networks. This can optimally leverage the resources that are in the range of the end-user device and provide a greater sense of connection reliability. Implementing both mobility and multihoming in wireless networks can accommodate the increasing demands of the users and provide better user experience and network utilization. When these mechanisms are implemented in the network, it is important to present their features and demonstrate their functionalities. Visualization provides an intuitive and interesting way of understanding the changes that occur in the network. In order to demonstrate the functionalities, it is necessary to interact with the network nodes and remotely trigger network actions. These actions should also be visualized to understand the changes that happened in the network. The objective of this Dissertation is to develop a visualization platform able both to visualize mobility and multihoming in the network, and interact with the network to remotely trigger network actions. For this purpose, a framework has been developed and integrated in a mobility protocol with multihoming support. To demonstrate the functionalities of the developed platform, a testbed has been deployed in the laboratory environment and tests were performed to verify the implemented functionalities and evaluate its performance. The results show that the platform is able to visualize both mobility and multihoming in real-time. Also, the platform can interact with the network nodes in order to trigger network related actions, and visualize the result of these actions

Design of Interactive Visualizations for Next-Generation Ultra-Large Communication Networks

© 2013 IEEE. With the increasing size and complexity of next-generation communication networks, it is critical to utilize interactive visualizations to support the monitoring, planning, and management of networks. Effectively visualizing large-scale networks is difficult with traditional methods because of the high link density and complex node relationships. Given the limited screen space, to assist Internet Service Provider\u27s (ISP) network planning and management activities, investigating how to present ultra-large-scale network data efficiently is crucial. This paper presents a real-Time interactive visualization system that combines the design strategies of progressive disclosure and multiple panels to elegantly visualize the large-scale networks and avoid the information-overload problem. The system also visualizes the configuration of the network elements and provides the network performance information, including the port-level Quality of Service (QoS) metrics. Furthermore, the system enables navigation through the port-level connection and provides different modes for multiple purposes

Modeling Computer Communication Networks in a Realistic 3D Environment

Communication network simulations have typically been visualized in the past through 2D representations, but this is insufficient for battlefield network scenarios. Visual representations of battlefield networks greatly benefit from 3D visualization due to its ability to retain asset location. This research investigates the feasibility of modeling a typical battlefield communication network in a realistic 3D manner and discusses the effects of doing so. The result is an open source, 3D network visualization tool that can create highly intuitive connected battlefield scenes, enabling the user to quickly comprehend network state. It highlights mobile assets, packet movement, and node connectivity while allowing the viewer to interact with the scene

A comparative study of routing protocols in MANETs

Mobile Ad Hoc networks are emerging area of mobile computing. A mobile ad hoc network (MANET) is composed of mobile routers and associated hosts connected by wireless links. The routers are free to move randomly and organize themselves arbitrarily, thus, the network\u27s wireless topology may change rapidly and unpredictably. In fact, it is considered that each node would have some capacity to relay the information thus constrained by computational power, battery life and increasingly complex routing with added functionality of a router. Nodes may keep joining and leaving an ad hoc network. Such a network may operate in a stand alone fashion, or may be connected to the larger Internet. Lack of infrastructure in ad hoc networks sets new challenges for routing algorithms where the network is formed by a collection of wireless mobile nodes dynamically forming a temporary network without the use of any existing network infrastructure or centralized administration. A number of routing protocols like Dynamic Source Routing (DSR), Ad Hoc On-Demand Distance Vector Routing (AODV), Destination-Sequenced Distance-Vector (DSDV), Zone Routing Protocol (ZRP) and Temporally Ordered Routing Algorithm (TORA) have been implemented. In this thesis an attempt has been made to compare the performance of prominent on-demand reactive routing protocols for mobile ad hoc networks (AODV and TORA), along with the traditional proactive DSDV protocol. Although AODV and TORA share similar on-demand behavior, the differences in the protocol mechanics can lead to significant performance differentials. The performance differentials are analyzed using varying network loads, mobilities, and network sizes. These simulations are carried out using network simulator (ns-2.1b9a) to run mobile ad hoc network simulations

EASR: Graph-based Framework for Energy Efficient Smart Routing in MANET using Availability Zones

Energy consumption in MobileAdhoc Network (MANET) is a topic of research from more than a decade. Althoughthere are multiple archival of literatures, that have proposed variousenergy-efficient algorithms for reducing the energy consumption to improveenergy efficiency. Establishing correct and reliable route is important designissue in MANET, but a more challenging goal is to provide energy efficientroute. But, it was observed that majority of such energy efficient routingprotocols just give symptomatic solution which addresses and mitigated theenergy issues overlooking various associated issues like quality of services.Moreover, in majority of research previous studies it is found that AODV andDSDV are highly in adoption rate among the researcher for solving energy issuesusing routing protocols. This manuscript after reviewing some of thesignificant literatures in past explored issues in existing AODV and DSDVand  proposes a novel energy efficientrouting protocols by incorporating a new actor called availability zone. Theproposed model shows better energy efficiency and QoS compared to AODV andDSDV

The Dynamics of Vehicular Networks in Urban Environments

Vehicular Ad hoc NETworks (VANETs) have emerged as a platform to support intelligent inter-vehicle communication and improve traffic safety and performance. The road-constrained, high mobility of vehicles, their unbounded power source, and the emergence of roadside wireless infrastructures make VANETs a challenging research topic. A key to the development of protocols for inter-vehicle communication and services lies in the knowledge of the topological characteristics of the VANET communication graph. This paper explores the dynamics of VANETs in urban environments and investigates the impact of these findings in the design of VANET routing protocols. Using both real and realistic mobility traces, we study the networking shape of VANETs under different transmission and market penetration ranges. Given that a number of RSUs have to be deployed for disseminating information to vehicles in an urban area, we also study their impact on vehicular connectivity. Through extensive simulations we investigate the performance of VANET routing protocols by exploiting the knowledge of VANET graphs analysis.Comment: Revised our testbed with even more realistic mobility traces. Used the location of real Wi-Fi hotspots to simulate RSUs in our study. Used a larger, real mobility trace set, from taxis in Shanghai. Examine the implications of our findings in the design of VANET routing protocols by implementing in ns-3 two routing protocols (GPCR & VADD). Updated the bibliography section with new research work

SURVEY STUDY FOR VEHICULAR AD HOC NETWORKS PERFORMANCE IN CITY AND URBAN RESIDENTIAL AREAS

This thesis it survey study for VANET (Vehicular Ad-Hoc Networks) and it performance in city and urban residential areas, when the the number of vehicles on roads is increasing annually, due to the higher amount of traffic, there are more accidents associated with road traffic complexity. VANET can be used to detect dangerous situations which are forwarded to the driver assistant system by monitoring the traffic status.fi=Opinnäytetyö kokotekstinä PDF-muodossa.|en=Thesis fulltext in PDF format.|sv=Lärdomsprov tillgängligt som fulltext i PDF-format