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Author: Xiaolong Li
Publisher:
ISBN: 9781109263442
Category :
Languages : en
Pages : 137
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Book Description
The prevalence of high bandwidth-delay product networks creates significant challenges for TCP and AQM schemes. To that end, various mechanisms have been proposed to either adaptively adjust sending window size by amending the parameters of Additive-Increase Multiplicative-Decrease, use different congestion signals, or even explicitly signal the congestion information to the sender. Often times, such mechanisms fail to simultaneously achieve high utilization and fairness while maintaining low persistent queue length and minimizing congestion-induced packet drop rate. In contrast, a pair of recently proposed protocols, XCP and VCP, can achieve near zero congestion loss in wired networks by decoupling fairness control from efficiency. In addition, the operation of any congestion control protocol over wireless networks is subject to a significant performance degradation without differentiating between congestion-caused loss associated with network buffering and error-caused loss associated with fading effects. This dissertation provides a cross-layer framework of analysis, simulation, implementation, emulation, and performance profiling of congestion control protocols over wireless networks. Relying on simulation, emulation, and implementation, we demonstrate that VCP represents a high performing yet practical congestion control protocol for wireless networks. Further, some of the shortcomings of VCP are identified including its oscillatory behavior in the presence of link estimation errors, relatively low speed of convergence and poor fairness characteristic in moderate bandwidth high delay networks due to utilizing an insufficient amount of congestion feedback. Next, a distributed congestion control scheme is proposed that distributes and extracts congestion related information into and/or from a chain of packets. Utilizing such a scheme, we design and implement a distributed ECN-based congestion control protocol to which we refer as Multi Packet Congestion Control Protocol (MPCP). In contrast to VCP, MPCP is able to relay a more precise congestion feedback while preserving the use of no more than the two ECN bits in each packet. Additionally, a heuristic scheme for identifying the cause of loss in wireless network is proposed. This scheme can be applied to any feedback-based congestion control algorithm and can achieve a significant performance improvement over lossy wireless networks.
Author: Xiaolong Li
Publisher:
ISBN: 9781109263442
Category :
Languages : en
Pages : 137
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Book Description
The prevalence of high bandwidth-delay product networks creates significant challenges for TCP and AQM schemes. To that end, various mechanisms have been proposed to either adaptively adjust sending window size by amending the parameters of Additive-Increase Multiplicative-Decrease, use different congestion signals, or even explicitly signal the congestion information to the sender. Often times, such mechanisms fail to simultaneously achieve high utilization and fairness while maintaining low persistent queue length and minimizing congestion-induced packet drop rate. In contrast, a pair of recently proposed protocols, XCP and VCP, can achieve near zero congestion loss in wired networks by decoupling fairness control from efficiency. In addition, the operation of any congestion control protocol over wireless networks is subject to a significant performance degradation without differentiating between congestion-caused loss associated with network buffering and error-caused loss associated with fading effects. This dissertation provides a cross-layer framework of analysis, simulation, implementation, emulation, and performance profiling of congestion control protocols over wireless networks. Relying on simulation, emulation, and implementation, we demonstrate that VCP represents a high performing yet practical congestion control protocol for wireless networks. Further, some of the shortcomings of VCP are identified including its oscillatory behavior in the presence of link estimation errors, relatively low speed of convergence and poor fairness characteristic in moderate bandwidth high delay networks due to utilizing an insufficient amount of congestion feedback. Next, a distributed congestion control scheme is proposed that distributes and extracts congestion related information into and/or from a chain of packets. Utilizing such a scheme, we design and implement a distributed ECN-based congestion control protocol to which we refer as Multi Packet Congestion Control Protocol (MPCP). In contrast to VCP, MPCP is able to relay a more precise congestion feedback while preserving the use of no more than the two ECN bits in each packet. Additionally, a heuristic scheme for identifying the cause of loss in wireless network is proposed. This scheme can be applied to any feedback-based congestion control algorithm and can achieve a significant performance improvement over lossy wireless networks.
Author: Tarik Ismail Hassan Khalel
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Author: Management Association, Information Resources
Publisher: IGI Global
ISBN: 1799824551
Category : Technology & Engineering
Languages : en
Pages : 1618
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Book Description
Collecting and processing data is a necessary aspect of living in a technologically advanced society. Whether it’s monitoring events, controlling different variables, or using decision-making applications, it is important to have a system that is both inexpensive and capable of coping with high amounts of data. As the application of these networks becomes more common, it becomes imperative to evaluate their effectiveness as well as other opportunities for possible implementation in the future. Sensor Technology: Concepts, Methodologies, Tools, and Applications is a vital reference source that brings together new ways to process and monitor data and to put it to work in everything from intelligent transportation systems to healthcare to multimedia applications. It also provides inclusive coverage on the processing and applications of wireless communication, sensor networks, and mobile computing. Highlighting a range of topics such as internet of things, signal processing hardware, and wireless sensor technologies, this multi-volume book is ideally designed for research and development engineers, IT specialists, developers, graduate students, academics, and researchers.
Author: Kevin L. Mills
Publisher: DIANE Publishing
ISBN: 143793899X
Category : Computers
Languages : en
Pages : 570
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Book Description
This is a print on demand edition of a hard to find publication. Society is becoming increasingly reliant on large networked information systems for commerce, communication, education, entertainment and government. Currently, however, system designers lack techniques to predict global behaviors that may arise in the Internet as a result of interactions among existing and altered software components. Hardware faults and unexpected usage patterns may also occur within the Internet. This study aims to improve existing knowledge about a range of methods and tools that could be applied to understand and predict behavior in complex information systems. Charts and tables.
Author: Subir Varma
Publisher: Morgan Kaufmann
ISBN: 0128036001
Category : Computers
Languages : en
Pages : 287
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Book Description
Internet Congestion Control provides a description of some of the most important topics in the area of congestion control in computer networks, with special emphasis on the analytical modeling of congestion control algorithms. The field of congestion control has seen many notable advances in recent years and the purpose of this book, which is targeted towards the advanced and intermediate reader, is to inform about the most important developments in this area. The book should enable the reader to gain a good understanding of the application of congestion control theory to a number of application domains such as Data Center Networks, Video Streaming, High Speed Links and Broadband Wireless Networks. When seen through the lens of analytical modeling, there are a number of common threads that run through the design and analysis of congestion control protocols in all these different areas, which are emphasized in this book. The book also cuts a path through the profusion of algorithms in the literature, and puts the topic on a systematic and logical footing. Internet Congestion Control provides practicing network engineers and researchers with a comprehensive and accessible coverage of analytical models of congestion control algorithms, and gives readers everything needed to understand the latest developments and research in this area. Examines and synthesizes the most important developments in internet congestion control from the last 20 years. Provides detailed description on the congestion control protocols used in four key areas; broadband wireless networks, high speed networks with large latencies, video transmission networks, and data center networks. Offers accessible coverage of advanced topics such as Optimization and Control Theory as applied to congestion control systems.
Author: Gaurav Rajguru
Publisher:
ISBN:
Category : Routing (Computer network management)
Languages : en
Pages : 92
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Book Description
Author: Christos N. Houmkozlis
Publisher: CRC Press
ISBN: 1351833502
Category : Computers
Languages : en
Pages : 334
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Book Description
Establishing adaptive control as an alternative framework to design and analyze Internet congestion controllers, End-to-End Adaptive Congestion Control in TCP/IP Networks employs a rigorously mathematical approach coupled with a lucid writing style to provide extensive background and introductory material on dynamic systems stability and neural network approximation; alongside future internet requests for congestion control architectures. Designed to operate under extreme heterogeneous, dynamic, and time-varying network conditions, the developed controllers must also handle network modeling structural uncertainties and uncontrolled traffic flows acting as external perturbations. The book also presents a parallel examination of specific adaptive congestion control, NNRC, using adaptive control and approximation theory, as well as extensions toward cooperation of NNRC with application QoS control. Features: Uses adaptive control techniques for congestion control in packet switching networks Employs a rigorously mathematical approach with lucid writing style Presents simulation experiments illustrating significant operational aspects of the method; including scalability, dynamic behavior, wireless networks, and fairness Applies to networked applications in the music industry, computers, image trading, and virtual groups by techniques such as peer-to-peer, file sharing, and internet telephony Contains working examples to highlight and clarify key attributes of the congestion control algorithms presented Drawing on the recent research efforts of the authors, the book offers numerous tables and figures to increase clarity and summarize the algorithms that implement various NNRC building blocks. Extensive simulations and comparison tests analyze its behavior and measure its performance through monitoring vital network quality metrics. Divided into three parts, the book offers a review of computer networks and congestion control, presents an adaptive congestion control framework as an alternative to optimization methods, and provides appendices related to dynamic systems through universal neural network approximators.
Author: Taha Saedi
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
In this thesis, we analyze the performance of wireless LAN networks subject to random loss. In this regard, we use a congestion control technique that has been introduced in a previous study, titled TCP Congestion Control Enhancement for Random Loss (TCP CERL). TCP CERL is a sender-side modification of TCP Reno protocol. TCP CERL is an end-to-end technique that achieves high performance over wireless links and does not decrease the congestion window and slow start threshold if the random loss is detected. TCP CERL assumes a static threshold (A) equal to 0.55 which does not perform well when considering a heavy traffic load compared to new protocols. In this thesis, we propose a modified version of TCP CERL, called TCP CERL PLUS (TCP CERL+, in short). TCP CERL+ works similarly as TCP CERL, but its main idea is to use a dynamic threshold (A) in terms of Round-Trip Time (RTT) rather than static threshold. By doing so, we employ the average RTT and the minimum RTT measurements made over the connection to evaluate the queue length of the bottleneck link. In this thesis, we compare TCP CERL and TCP CERL+ with TCP New Jersey+, TCP mVeno, TCP Westwood+, TCP Cubic, TCP YeAH, and TCP NewReno by using Network Simulation NS-2. The results will show that CERL+ outperforms CERL when there are many users and Two-way transmission.
Author: Sudip Misra
Publisher: Springer Science & Business Media
ISBN: 1848003285
Category : Computers
Languages : en
Pages : 581
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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: Ngoc Quang Nguyen
Publisher: Nova Science Publishers
ISBN: 9781536192827
Category : Computers
Languages : en
Pages : 293
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Book Description
"Nowadays, network connectivity and the Internet have been an indispensable part of our daily lives via various services/applications supporting all of the industry areas ranged from trade and business, administration to entertainment, transportation, education, and healthcare. Typically, the concepts and introductions of terms, such as the Internet of Things (IoT), cloud or edge/fog computing, and content-oriented network services, have been investigated as emerging topics toward the realization of the Internet of Everything (IoX) in the future. Toward this end, developing an efficient congestion control mechanism is regarded as a key to an efficient and robust network design since the network availability and stability can directly affect the network performance, in terms of interoperability and robustness, especially in the case of an explosive increase in the network traffic volume. In particular, when a network link becomes corrupted or overload, congestion may occur due to packet drops. As a result, the overall network performance, including network throughput, latency, and response time will be degraded. The book is not intended to provide a comprehensive description of various congestion control techniques. Rather, with the assumptions that the readers have some general knowledge of networking fundamentals, the main goal of this book is to bring together distinguished perspectives of congestion control in different network platforms and technologies, ranged from TCP/IP, MPTCP (Multipath TCP) in heterogeneous networks, wireless networks to information-centric networks as future networks, and even supercomputing. The book then aims to give a new insight into this challenging and important topic of congestion control to overcome network performance degradation when congestion occurs from both theory/principles and practical viewpoints. Hence, we hope that this book provides a broader picture of the Congestion control concept in the context of communication networks toward efficient network design"--
