Download or read book On Routing Algorithms with End to end Delay Guarantees written by and published by . This book was released on 1998 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors consider the transmission of a message of size r from a source to a destination with guarantees on the end-to-end delay over a computer network with n nodes and m links. There are three sources of delays: (a) propagation delays along the links, (b) delays due to bandwidth availability on the links, and (c) queuing delays at the intermediate nodes. First, the authors consider that delays on various links and nodes are given as functions of the message size. If the delay in (b) is a non-increasing function of the bandwidth, they propose O(m2 + mn log n) time algorithm to compute a path with the minimum end-to-end delay for any given message size r. They then consider that the queuing delay in (c) is a random variable correlated with the message size according to an unknown distribution. At each node, the measurements of queuing delays and message sizes are available. They propose two algorithms to compute paths whose delays are close to optimal delays with a high probability, irrespective of the distribution of the delays, and based entirely on the measurements of sufficient size.

Download or read book Routing with Inaccurate Link state Information in a Guaranteed Quality of Service Environment written by Aekkachai Rattanadilokchai and published by . This book was released on 2000 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book QoS based Routing in Networks with Inaccurate Information Theory and Algorithms written by International Business Machines Corporation. Research Division and published by . This book was released on 1996 with total page 41 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "We investigate the problem of routing connections with QoS requirements across one or more networks, when the information available for making routing decisions is inaccurate and expressed in some probabilistic manner. This uncertainty about the actual state of a node or network arises naturally in a number of different environments, that are reviewed in the paper. The main focus is to determine the impact of such inaccuracies on the path selection process, whose goal is then to identify the path that is most likely to satisfy the QoS requirements. We indicate that this impact is minimal for connections with only bandwidth requirements. However, when end-to-end delay requirements are considered, the problem becomes intractable. Nonetheless, we obtain efficient solutions by exploring several practical approaches. We consider two modules for providing delay guarantees, a local delay model and a rate- based model, that are representative of two popular frameworks being considered for providing such guarantees. For both models, we identify a number of approaches that have reasonable complexity and let us identify 'good' paths for connections with end-to-end delay guarantees."

Download or read book Networking ICN 2001 written by Pascal Lorenz and published by Springer Science & Business Media. This book was released on 2001-06-27 with total page 868 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes, together with its compagnion LNCS 2094, the refereed proceedings of the First International Conference on Networking, ICN 2001, held in Colmar, France in June 2001. The 168 papers presented were carefully reviewed and selected from around 300 submissions. The proceedings offers topical sections on third and fourth generation, Internet, traffic control, mobile and wireless IP, differentiated services, GPRS and cellular networks, WDM and optical networks, differentiated and integrated services, wireless ATM multicast, real-time traffic, wireless, routing, traffic analysis, traffic modeling and simulation, user applications, mobility management, TCP analysis, QoS, ad hoc networks, security, MPLS, switches, CORBA, mobile agents, ATM networks, voice over IP, active networks, video communications, and modelization.

Download or read book Quality of service Routing in Integrated Services Networks written by Carnegie-Mellon University. Computer Science Dept and published by . This book was released on 1998 with total page 153 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "Future integrated services networks will support multiple classes of service to meet the diverse quality-of-service (QoS) requirements of applications. To meet these end-to-end QoS requirements, strict resource constraints may have to be imposed on the paths being used. QoS routing refers to a set of protocols and algorithms that can select paths that satisfy such constraints while achieving high network throughput. QoS routing is challenging because (1) different service classes employ different resource sharing models, (2) service classes dynamically share link resources, and (3) selecting paths that meet multiple QoS constraints is a complex algorithmic problem. This dissertation shows QoS routing in integrated services networks is both desirable and feasible. To support this claim, this dissertation develops an integrated QoS routing framework that has two components. The first component consists of routing algorithms for individual service classes that support either bandwidth guarantees, delay guarantees, or high throughput. By exploiting the relationship between QoS constraints, we develop polynomial routing algorithms for traffic classes that require stringent end-to-end performance guarantees. By coupling routing with finer-time scale resource management mechanisms such as congestion control and scheduling, we develop routing algorithms that achieve high throughput for best-effort traffic and low blocking rate for guaranteed traffic. By striking an appropriate balance between per-flow resource consumption and the distribution of network load, these algorithms improve resource utilization efficiency and network throughput under dynamic load conditions. In a network that supports multiple classes of service, best-effort flows can experience congestion or even starvation if guaranteed flows are not routed appropriately. The second component of the proposed QoS routing framework is an effective inter-class resource sharing mechanism that also takes into consideration the link load of best-effort traffic while routing guaranteed flows. This mechanism is simple in the sense that it influences routing decisions by changing the link costs used for guaranteed traffic without requiring any change to the routing algorithms employed for individual service classes. In various scenarios, we observed significant performance improvements for best-effort traffic without sacrificing any performance for guaranteed traffic."

Download or read book Quality of service Routing in Integrated Services Networks written by Carnegie Mellon University. Computer Science Department and published by . This book was released on 1998 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "Future integrated services networks will support multiple classes of service to meet the diverse quality-of-service (QoS) requirements of applications. To meet these end-to-end QoS requirements, strict resource constraints may have to be imposed on the paths being used. QoS routing refers to a set of protocols and algorithms that can select paths that satisfy such constraints while achieving high network throughput. QoS routing is challenging because (1) different service classes employ different resource sharing models, (2) service classes dynamically share link resources, and (3) selecting paths that meet multiple QoS constraints is a complex algorithmic problem. This dissertation shows QoS routing in integrated services networks is both desirable and feasible. To support this claim, this dissertation develops an integrated QoS routing framework that has two components. The first component consists of routing algorithms for individual service classes that support either bandwidth guarantees, delay guarantees, or high throughput. By exploiting the relationship between QoS constraints, we develop polynomial routing algorithms for traffic classes that require stringent end-to-end performance guarantees. By coupling routing with finer-time scale resource management mechanisms such as congestion control and scheduling, we develop routing algorithms that achieve high throughput for best-effort traffic and low blocking rate for guaranteed traffic. By striking an appropriate balance between per-flow resource consumption and the distribution of network load, these algorithms improve resource utilization efficiency and network throughput under dynamic load conditions. In a network that supports multiple classes of service, best-effort flows can experience congestion or even starvation if guaranteed flows are not routed appropriately. The second component of the proposed QoS routing framework is an effective inter-class resource sharing mechanism that also takes into consideration the link load of best-effort traffic while routing guaranteed flows. This mechanism is simple in the sense that it influences routing decisions by changing the link costs used for guaranteed traffic without requiring any change to the routing algorithms employed for individual service classes. In various scenarios, we observed significant performance improvements for best-effort traffic without sacrificing any performance for guaranteed traffic."

Download or read book Algorithms for Network Routing Multicasting Switching and Design written by Ashish Goel and published by . This book was released on 1999 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Building QoS into Distributed Systems written by Andrew T. Campbell and published by Springer. This book was released on 2013-06-29 with total page 433 pages. Available in PDF, EPUB and Kindle. Book excerpt: Welcome to IWQOS'97 in New York City! Over the past several years, there has been a considerable amount of research within the field of Quality of Service (QOS). Much of that work has taken place within the context of QOS support for distributed multimedia systems, operating systems, transport subsystems, networks, devices and formal languages. The objective of the Fifth International Workshop on Quality of Service (IWQOS) is to bring together researchers, developers and practitioners working in all facets of QOS research. While many workshops and conferences offer technical sessions on the topic QOS, none other than IWQOS, provide a single-track workshop dedicated to QOS research. The theme of IWQOS'97 is building QOS into distributed systems. Implicit in that theme is the notion that the QOS community should now focus on discussing results from actual implementations of their work. As QOS research moves from theory to practice, we are interested in gauging the impact of ideas discussed at previous workshops on development of actual systems. While we are interested in experimental results, IWQOS remains a forum for fresh and innovative ideas emerging in the field. As a result of this, authors were solicited to provide experimental research (long) papers and more speculative position (short) statements for consideration. We think we have a great invited and technical program lined up for you this year. The program reflects the Program Committees desire to hear about experiment results, controversial QOS subjects and retrospectives on where we are and where we are going.

Download or read book High Performance Computing HiPC 2000 written by Mateo Valero and published by Springer Science & Business Media. This book was released on 2000-12 with total page 560 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the refereed proceedings of the 7th International Conference on High Performance Computing, HiPC 2000, held in Bangalore, India in December 2000. The 46 revised papers presented together with five invited contributions were carefully reviewed and selected from a total of 127 submissions. The papers are organized in topical sections on system software, algorithms, high-performance middleware, applications, cluster computing, architecture, applied parallel processing, networks, wireless and mobile communication systems, and large scale data mining.

Download or read book Dynamic Routing Protocols Creating Stability and Reliability through Evaluation and Comparison written by and published by GRIN Verlag. This book was released on 2023-04-28 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt: Master's Thesis from the year 2022 in the subject Computer Science - Internet, New Technologies, grade: 1,5, , language: English, abstract: The main objective of this study is the empirical analysis of the evaluation and comparison of dynamic routing protocols regarding their stability and reliability. An especially close look will be paid to EIGRP, OSPF, and RIP; RIP (Routing Information Protocol) being one of the oldest routing protocols still in service. A routing protocol is a protocol which is responsible to determine how routers communicate with each other and forward packets through an optimal path, travelling from source node to destination node. Each routing protocols performs in different ways. They have their own architecture, route to follow and sometimes even delays in packets. OSPF builds a database of routes to its neighbors, using an algorithm to calculate the best possible path. EIGRP is a vector routing protocol that is used on a computer network to help automate routing decisions and configuration. The author of this text is not a native English speaker. Please excuse any grammatical errors and other inconsistencies.

Download or read book Proceedings of the Third International Conference on Contemporary Issues in Computer and Information Sciences CICIS 2012 written by and published by Universal-Publishers. This book was released on with total page 625 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Advanced Information Networking and Applications written by Leonard Barolli and published by Springer. This book was released on 2019-03-14 with total page 1357 pages. Available in PDF, EPUB and Kindle. Book excerpt: The aim of the book is to provide latest research findings, innovative research results, methods and development techniques from both theoretical and practical perspectives related to the emerging areas of information networking and applications. Networks of today are going through a rapid evolution and there are many emerging areas of information networking and their applications. Heterogeneous networking supported by recent technological advances in low power wireless communications along with silicon integration of various functionalities such as sensing, communications, intelligence and actuations are emerging as a critically important disruptive computer class based on a new platform, networking structure and interface that enable novel, low cost and high volume applications. Several of such applications have been difficult to realize because of many interconnections problems. To fulfill their large range of applications different kinds of networks need to collaborate and wired and next generation wireless systems should be integrated in order to develop high performance computing solutions to problems arising from the complexities of these networks. This book covers the theory, design and applications of computer networks, distributed computing and information systems.

Download or read book Localized Quality of Service Routing Algorithms for Communication Networks written by Ahmed S. Alzahrani and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Quality of Service (QoS) routing considered as one of the major components of the QoS framework in communication networks. The concept of QoS routing has emerged from the fact that routers direct traffic from source to destination, depending on data types, network constraints and requirements to achieve network performance efficiency. It has been introduced to administer, monitor and improve the performance of computer networks. Many QoS routing algorithms are used to maximize network performance by balancing traffic distributed over multiple paths. Its major components include bandwidth, delay, jitter, cost, and loss probability in order to measure the end users' requirements, optimize network resource usage and balance traffic load. The majority of existing QoS algorithms require the maintenance of the global network state information and use it to make routing decisions. The global QoS network state needs to be exchanged periodically among routers since the efficiency of a routing algorithm depends on the accuracy of link-state information. However, most of QoS routing algorithms suffer from scalability problems, because of the high communication overhead and the high computation effort associated with marinating and distributing the global state information to each node in the network. The goal of this thesis is to contribute to enhancing the scalability of QoS routing algorithms. Motivated by this, the thesis is focused on localized QoS routing that is proposed to achieve QoS guarantees and overcome the problems of using global network state information such as high communication overhead caused by frequent state information updates, inaccuracy of link-state information for large QoS state update intervals and the route oscillating due to the view of state information. Using such an approach, the source node makes its own routing decisions based on the information that is local to each node in the path. Localized QoS routing does not need the global network state to be exchanged among network nodes because it infers the network state and avoids all the problems associated with it, like high communication and processing overheads and oscillating behaviour. In localized QoS routing each source node is required to first determine a set of candidate paths to each possible destination. In this thesis we have developed localized QoS routing algorithms that select a path based on its quality to satisfy the connection requirements. In the first part of the thesis a localized routing algorithm has been developed that relies on the average residual bandwidth that each path can support to make routing decisions. In the second part of the thesis, we have developed a localized delay-based QoS routing (DBR) algorithm which relies on a delay constraint that each path satisfies to make routing decisions. We also modify credit-based routing (CBR) so that this uses delay instead of bandwidth. Finally, we have developed a localized QoS routing algorithm for routing in two levels of a hierarchal network and this relies on residual bandwidth to make routing decisions in a hierarchical network like the internet. We have compared the performance of the proposed localized routing algorithms with other localized and global QoS routing algorithms under different ranges of workloads, system parameters and network topologies. Simulation results have indicated that the proposed algorithms indeed outperform algorithms that use the basics of schemes that currently operate on the internet, even for a small update interval of link state. The proposed algorithms have also reduced the routing overhead significantly and utilize network resources efficiently.

Download or read book Conference Proceedings of the IEEE International Performance Computing and Communications Conference written by and published by . This book was released on 2002 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book High Performance Backbone Network Technology written by Naoaki Yamanaka and published by CRC Press. This book was released on 2020-04-01 with total page 1078 pages. Available in PDF, EPUB and Kindle. Book excerpt: Compiling the most influential papers from the IEICE Transactions in Communications, High-Performance Backbone Network Technology examines critical breakthroughs in the design and provision of effective public service networks in areas including traffic control, telephone service, real-time video transfer, voice and image transmission for a content delivery network (CDN), and Internet access. The contributors explore system structures, experimental prototypes, and field trials that herald the development of new IP networks that offer quality-of-service (QoS), as well as enhanced security, reliability, and function. Offers many hints and guidelines for future research in IP and photonic backbone network technologies

Download or read book Wavelet Analysis And Active Media Technology In 3 Volumes Proceedings Of The 6th International Progress written by Stephane Jaffard and published by World Scientific. This book was released on 2005-07-06 with total page 1680 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wavelet analysis and its applications have been one of the fastest growing research areas in the past several years. Wavelet theory has been employed in numerous fields and applications, such as signal and image processing, communication systems, biomedical imaging, radar, air acoustics, and many other areas. Active media technology is concerned with the development of autonomous computational or physical entities capable of perceiving, reasoning, adapting, learning, cooperating, and delegating in a dynamic environment.This book captures the essence of the current state of the art in wavelet analysis and active media technology. It includes nine invited papers by distinguished researchers: P Zhang, T D Bui and C Y Suen from Concordia University, Canada; N A Strelkov and V L Dol'nikov from Yaroslavl State University, Russia; Chin-Chen Chang and Ching-Yun Chang from Taiwan; S S Pandey from R D University, India; and I L Bloshanskii from Moscow State Regional University, Russia.The proceedings have been selected for coverage in:

Download or read book Beamforming Antennas in Wireless Networks written by Osama Bazan and published by Springer Nature. This book was released on 2021-07-08 with total page 128 pages. Available in PDF, EPUB and Kindle. Book excerpt: Wireless networks are facing growing demand for high capacity, better coverage, support of new applications and broad range of services. In this book, the authors first present an overview of beamforming antennas and millimeter wave communications followed by a discussion on the challenges and issues facing MAC and multi-hop routing in the wireless networks with beamforming antennas. Then, they discuss various MAC and routing protocols that are specifically designed to address those issues and exploit the benefits of millimeter wave and beamforming antennas. Authors also present a framework to provide Quality of Service (QoS) in contention-based wireless networks with beamforming antennas. Finally, the book is concluded with a discussion on open research topics for future generation WLAN systems.