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Author: Ali Dabirmoghaddam Publisher: ISBN: 9780355334067 Category : Languages : en Pages : 143
Book Description
The first part of this dissertation studies how the spatial diversity of social contacts affect the scalability of communication networks and identifies classes of social models that let computer networks properly scale. From this analysis, it is established that scalability is achieved under social models in which social contacts are statistically concentrated within a confined geographical region around each node. We shall recognize that the true distribution of social contacts in real networks does not generally meet this requirement, imposing a scalability gap on today's networks.
Author: Ali Dabirmoghaddam Publisher: ISBN: 9780355334067 Category : Languages : en Pages : 143
Book Description
The first part of this dissertation studies how the spatial diversity of social contacts affect the scalability of communication networks and identifies classes of social models that let computer networks properly scale. From this analysis, it is established that scalability is achieved under social models in which social contacts are statistically concentrated within a confined geographical region around each node. We shall recognize that the true distribution of social contacts in real networks does not generally meet this requirement, imposing a scalability gap on today's networks.
Author: Scott Rager Publisher: ISBN: Category : Languages : en Pages :
Book Description
This dissertation centers around two relatively new fields of study in communication networks. The first, Quality of Information, or QoI, refers to the inherent and contextual characteristics of data that define its utility to a particular application. The second, wireless ad hoc networks, are a field of network applications in which wireless devices, which are often mobile, must exchange information without the support of existing infrastructure, making them highly suitable for applications like emergency networks, military tactical networks, and sensor networks. Both QoI and wireless ad hoc networks bring a distinct set of design challenges to light because of their novelty and unique attributes. Both, however, also provide new opportunities for rethinking network research. Specifically, we expand our approach to designing network protocols to include algorithms that control a number of layers in the network stack jointly using current network conditions, such as backpressure routing. Within this approach to network control, we also seek to understand how the QoI metrics of accuracy, precision, and freshness of the network state information impact performance. Additionally, we consider the QoI of application layer data. We do so first by designing algorithms to select data in wireless sensor networks with the goal of maximizing the coverage of the selected data. We then model the scalability and limitations of networks when designing them to provide a minimum level of QoI instead of traditional approaches that simply offer asymptotic analysis.In each contribution of this dissertation, we aim to understand the impact of QoI on network control and analysis by building flexible models able to be applied to a variety of potential applications. In our analysis, we have strived to consider the practicality of applications in real-life scenarios. We achieve this practicality by considering overhead of protocols, developing and analyzing approximation algorithms to computationally complex algorithms, and providing realistic simulation results generated by the Qualnet and ns-3 network simulation software packages.We first study the framework of backpressure routing, providing analysis of its performance under delayed or inaccurate network state information as well as a close look at how overhead impacts performance in distributing this network state information. Next, we use Lyapunov optimization techniques from backpressure routing theory in a QoI-aware application to data selection for maximum information coverage with cost constraints in sensor networks. Finally, we use QoI to create a framework that outlines practical scalability and maximum achievable QoI limits. Overall, the goal of this document is to explore how Quality of Information impacts design and understanding of control algorithms and performance limits in ad hoc networks designed to support a variety of applications.
Author: Demetres D. Kouvatsos Publisher: CRC Press ISBN: 1000793745 Category : Science Languages : en Pages : 489
Book Description
Over the recent years, a considerable amount of effort has been devoted, both in industry and academia, towards the performance modelling, evaluation and prediction of convergent multi-service heterogeneous networks, such as wireless and optical networks, towards the design and dimensioning of the next and future generation Internets.This book follows Heterogeneous Networks: Traffic Engineering, Performance Evaluation Studies and Tools and presents recent advances in networks of diverse technology reflecting the state-of-the-art technology and research achievements in performance modelling, analysis and applications worldwide.Technical topics discussed in the book include:• Multiservice Switching Networks;• Multiservice Switching Networks;• Wireless Ad Hoc Networks;• Wireless Sensor Networks;• Wireless Cellular Networks;• Optical Networks;Heterogeneous Networks:- Performance Modelling and Analysis contains recently extended research papers, which have their roots in the series of the HET-NETs International Working Conferences focusing on the 'Performance Modelling and Evaluation of Heterogeneous Networks' under the auspices of the EU Networks of Excellence Euro-NGI and Euro-FGI.Heterogeneous Networks: Performance Modelling and Analysis is ideal for personnel in computer/communication industries as well as academic staff and master/research students in computer science, operational research, electrical engineering and telecommunication systems and the Internet.KeywordsHeterogeneous networks, performance modelling and analysis, wired networks, wireless networks: ad hoc, sensor and cellular, optical networks, next and future generation Internets.
Author: Wuyi Yue Publisher: Springer Science & Business Media ISBN: 0306473119 Category : Computers Languages : en Pages : 335
Book Description
With the rapidly increasing penetration of laptop computers and mobile phones, which are primarily used by mobile users to access Internet s- vices like e-mail and World Wide Web (WWW) access, support of Internet services in a mobile environment is an emerging requirement. Wireless n- works have been used for communication among fully distributed users in a multimedia environment that has the needs to provide real-time bursty traffic (such as voice or video) and data traffic with excellent reliability and service quality. To satisfy the huge wireless multimedia service demand and improve the system performance, efficient channel access methods and analytical methods must be provided. In this way very accurate models, that faithfully reproduce the stochastic behavior of multimedia wireless communication and computer networks, can be constructed. Most of these system models are discrete-time queueing systems. Queueing networks and Markov chains are commonly used for the p- formance and reliability evaluation of computer, communication, and m- ufacturing systems. Although there are quite a few books on the individual topics of queueing networks and Markov chains, we have found none that covers the topics of discrete-time and continuous-time multichannel mul- traffic queueing networks. On the other hand, the design and development of multichannel mul- hop network systems and interconnected network systems or integrated n- works of multimedia traffic require not only such average performance m- sures as the throughput or packet delay but also higher moments of traffic departures and transmission delay.
Author: Ivan Ganchev Publisher: Springer ISBN: 3319108344 Category : Computers Languages : en Pages : 312
Book Description
Wireless networks of moving objects have drawn significant attention recently. These types of networks consist of a number of autonomous or semi-autonomous wireless nodes/objects moving with diverse patterns and speeds while communicating via several radio interfaces simultaneously. To overcome current shortcomings, a number of research challenges have to be addressed in this area, ranging from initial conceptualization and modelling, to protocols and architectures engineering, and development of suitable tools, applications and services, and to the elaboration of realistic use-case scenarios by taking into account corresponding societal and economic aspects. By applying a systematic approach the objective of this book is to assess the state of the art and consolidate the main research results achieved in this area. It was prepared as the Final Publication of the COST Action IC0906 “Wireless Networking for Moving Objects (WiNeMO)”. The book contains 15 chapters and is a show-case of the main outcomes of the action in line with its scientific goals. The book will serve as a valuable reference for undergraduate students, post-graduate students, educators, faculty members, researchers, engineers, and research strategists working in this field.
Author: Sharief M. A. Oteafy Publisher: John Wiley & Sons ISBN: 111876207X Category : Technology & Engineering Languages : en Pages : 153
Book Description
In this title, the authors leap into a novel paradigm of scalability and cost-effectiveness, on the basis of resource reuse. In a world with much abundance of wirelessly accessible devices, WSN deployments should capitalize on the resources already available in the region of deployment, and only augment it with the components required to meet new application requirements. However, if the required resources already exist in that region, WSN deployment converges to an assignment and scheduling scheme to accommodate for the new application given the existing resources. Such resources are polled from many fields, including multiple WSNs already in the field, static networks (WiFi, WiMAX, cellular, etc) in addition to municipal, industrial and mobile resources.The architecture, framework and pricing policy, as well as approaches for backward compatibility with existing deployments, are presented in this book. We elaborate on the formalization of the problem, and contrast with existing work on coverage. This paradigm adopts optimal assignments in WSNs and exploits dynamic re-programming for boosting post-deployment and backward compatible protocols.
Author: Sudip Misra Publisher: Springer Science & Business Media ISBN: 1848003285 Category : Computers Languages : en Pages : 581
Book Description
Overview and Goals Wireless communication technologies are undergoing rapid advancements. The past few years have experienced a steep growth in research in the area of wireless ad hoc networks. The attractiveness of ad hoc networks, in general, is attributed to their characteristics/features such as ability for infrastructure-less setup, minimal or no reliance on network planning and the ability of the nodes to self-organize and self-configure without the involvement of a centralized n- work manager, router, access point or a switch. These features help to set up a network fast in situations where there is no existing network setup or in times when setting up a fixed infrastructure network is considered infeasible, for example, in times of emergency or during relief operations. Even though ad hoc networks have emerged to be attractive and they hold great promises for our future, there are several challenges that need to be addressed. Some of the well-known challenges are attributed to issues relating to scalability, quality-of-service, energy efficiency and security.
Author: Ali Dabirmoghaddam
Author: Ali Dabirmoghaddam
Author: Scott Rager
Author: Preston Marshall
Author: Demetres D. Kouvatsos
Author: Piyush Gupta
Author: Yi Pan
Author: Wuyi Yue
Author: Ivan Ganchev
Author: Sharief M. A. Oteafy
Author: Sudip Misra