Efficient Quality Of Service Provisioning For Moving Networks
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Efficient Quality Of Service Provisioning For Moving Networks
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Author : George Kamel
language : en
Publisher:
Release Date : 2010
Efficient Quality Of Service Provisioning For Moving Networks written by George Kamel and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with Computer networks categories.
Providing Internet connectivity on public transport has the potential to open up a new dimension of consumer entertainment and productivity. However, the potentially large population density and high handover rates of mobile users aboard a public transport vehicle necessitate robust and scalable quality-of-service (QoS) provisioning mechanisms designed for such environments that can improve both pre-session and in-session signalling efficiency. -- A number of Quality of Service (QoS) aggregation policies are proposed that reduce the frequency with which QoS requests are made to a network, and hence increase overall pre-session signalling efficiency. However, since these policies are based on a static, request-rate-dependent parameter, operational inefficiency can occur under highly variant rates of request. Therefore, a cost-driven policy is proposed that is shown to increase signalling efficiency compared with other policies, while, at the same time, not putting users at a disadvantage with long and unpredictable waiting times to establish a session. -- When the access network becomes congested, signalling efficiency is drastically reduced under the cost-driven policy. Therefore, two separate "overlay" policies are proposed to work in place of the cost-driven aggregation policy during periods of congestion: a dynamic policy and a static policy. The static policy is shown to significantly out-perform the case in which no overlay policy is used, significantly increasing cost-efficiency whilst reducing user waiting times. -- Finally, attention is given to the issue of in-session QoS provisioning. Micro-mobility protocols play an important role in providing seamless handover support to terminals. However, such protocols typically suffer from bottleneck congestion, which can lead to a degradation of signalling efficiency and reduced QoS when they are used by moving networks.
Energy Efficient Quality Of Service Provisioning In Disaggregated Stoarge System
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Author : Joyanta Biswas
language : en
Publisher:
Release Date : 2021
Energy Efficient Quality Of Service Provisioning In Disaggregated Stoarge System written by Joyanta Biswas and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021 with categories.
With the emergence of high-performance storage devices and emerging remote access protocols such as NVMe over Fabrics (NVMe-oF), system throughput has increased several times. However, at the same time, aggregate throughput and uncertainty of traffic intensity can easily clog the network links and cause multiple QoS violations. Thus provisioning Quality of Services (QoS) becomes more challenging in such disaggregated storage systems, as it has to rely on both the storage and the network for performance. Besides that, energy management plays a crucial role in QoS provisioning, and provisioning needs to be managed cost-effectively (e.g., minimize energy consumption). Though most works mainly focus on the internal component of the storage and host servers, the network becomes a power-hungry resource as the legacy interconnect networks are being replaced with high-speed links (100 Gbps) that consumes several times more power than the conventional one. Also, at the same time, the increasing speeds generally result in much lower network utilization, which allows energy saving. From that motivation, we leverage the Low Power Idle (LPI) feature of Ethernet and propose an intelligent routing mechanism in order to maximize low power (or "sleep") opportunities for the network interfaces while avoiding link congestion. In testing out our mechanisms, we have enhanced the popular ns3 package for network modeling. Our intelligent routing mechanism serves the purpose of better performance and power tradeoff in networking components unless there is congestion in the storage server itself. To address that, we develop novel mechanisms for dynamically deciding when to move storage chunks (storage access unit) or alter the number of active chunk copies to alleviate congestion during high traffic episodes and enable traffic consolidation (and hence network energy savings) during low traffic periods. Increasing the number of active chunk copies (replication) or migrating storage chunks give the opportunity of performance enhancement during high load period and powersaving during the low period of activity. Using extensive simulations with modified ns3 network simulator, we provide deep insights into the migration vs. replication tradeoff. Though network congestion can be alleviated, tremendous throughput from different storage servers can still congest the TOR ⇐⇒ Host link or TOR ⇐⇒ Storage link in a shared environment. In that scenario, service differentiation is necessary, as different applications have different QoS requirements. In that context, we propose a QoS aware transport layer solution, which offers QoS differentiation without any compromise in overall system throughput.
Future Wireless And Optical Networks
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Author : Shengming Jiang
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-02-19
Future Wireless And Optical Networks written by Shengming Jiang and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-02-19 with Computers categories.
This book reviews the challenges of all-optical and wireless networks for the future Internet, with a focus on cross-layer design and optimization. Features: presents a thorough introduction to major networking modes and their effect on Internet development; proposes a new structure favorable for all-optical packet switching; discusses a new quality of service (QoS) provisioning approach, which overcomes the scalability problem of IntServ and the coarse QoS granularity of DiffServ; describes the end-to-end arguments in Internet design, before investigating a solution to congestion control problems in multi-hop wireless and all-optical networks; examines how to exploit multiple-input-multiple-output technology to improve network performance in centralized wireless networks; surveys green networking strategies from a quantitative perspective; suggests a strategic vision for possible developments of network technology for the future Internet.
Muiti Layer Optimization In Wireless Ad Hoc Networks
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Author :
language : en
Publisher:
Release Date : 2007
Muiti Layer Optimization In Wireless Ad Hoc Networks written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with Wireless communication systems categories.
The growing prevalence of wireless ad hoc networks calls for an innovative design to support Quality of Service (QoS) while maintaining high energy efficiency and bandwidth efficiency. In this dissertation, a multi-layer optimization approach is developed in view of benefits and necessities of sharing information among different layers. Specifically, given the traffic demands with QoS requirements, how to jointly design physical, MAC and network layers to optimize the network performance is considered in this dissertation. Firstly, a joint power control and maximally disjoint multipath routing scheme is proposed for QoS provisioning of end-to-end traffic with minimum rate constraint. A framework of power control with QoS constraints is introduced and both centralized and distributed solutions are derived. It is demonstrated by simulations that the proposed scheme provides high energy efficiency and the prolonged network lifetime, as well as robustness when augmented with a dynamic traffic monitoring and switching mechanism. In order to fulfill the QoS requirement at the link layer, TD/CDMA has been chosen as the MAC scheme due to its support for a high network throughput in a multihop environment. The multi-link versions of proportional fair and throughput optimal scheduling algorithms are proposed for multihop wireless ad hoc networks. In addition, a generic token counter mechanism is employed to satisfy the minimum and maximum rate requirements. Approximative algorithms are suggested to reduce the computational complexity. In networks that lack centralized control, distributed scheduling algorithms are derived and fully distributed implementations are provided. Simulation results demonstrate the effectiveness of the proposed schemes. In order to further improve bandwidth efficiency, cognitive radio is considered for more efficient spatial and temporal spectrum sharing. Specifically, we consider the scenario where a cognitive radio ad hoc network is formed by low power personal/portable devices operating simultaneously in the same frequency band along with a legacy system. A power control problem is formulated to maximize the energy efficiency of the ad hoc network, as well as to guarantee QoS for both legacy network users and ad hoc network users. The results show that cognitive radio greatly improves bandwidth efficiency of wireless ad hoc networks.
Quality Of Service Provisioning Through Resource Allocation And Data Aggregation In Wireless Sensor Networks
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Author : Carl Larsen
language : en
Publisher:
Release Date : 2009
Quality Of Service Provisioning Through Resource Allocation And Data Aggregation In Wireless Sensor Networks written by Carl Larsen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Ad hoc networks (Computer networks) categories.
"In this dissertation, improvement of quality of service (QoS) provisioning in wireless sensor networks (WSN) is examined using four different methods. The first two focus on allocation of limited resources in the face of changing network and channel conditions, and thus improving performance in terms of throughput and delay. The second two methods focus on using data aggregation to minimize the size and number of packet transmissions reducing the energy consumption and improving network lifetime. Therefore, in the first paper a novel adaptive and distributed fair scheduling (ADFS) protocol for WSN is presented that allocates the channel bandwidth in proportion to the weight of the packet flows, which are updated dynamically in order to ensure fairness while provisioning other QoS parameters such as throughput and packet losses. In the second paper, a routing-aware predictive congestion control (RPCC) scheme for WSN is presented by using a combination of a hop-by-hop congestion control mechanism and a dynamic routing scheme in order to forward the packets through less congested nodes while minimizing packet losses and end-to-end delays. By contrast, in the third paper, a data aggregation scheme is presented that uses least squares to fit a nonlinear function to multiple sensor data values, but only transmits the parameters of that polynomial over the network. This process is iterated along each node in the chain. However, in the fourth paper a different, but complementary, method of data aggregation, referred to as a nonlinear adaptive pulse coded modulation-based compression (NADPCMC), is introduced and its performance verified in the presence of noise, distortion, and quantization errors. The Lyapunov approach is utilized to verify analytically the performance of the proposed energy-efficient compression protocol"--Abstract, leaf iv.
Quality Of Service In The Emerging Networking Panorama
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Author : Josep Solé-Pareta
language : en
Publisher: Springer
Release Date : 2004-09-24
Quality Of Service In The Emerging Networking Panorama written by Josep Solé-Pareta and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2004-09-24 with Computers categories.
This book constitutes the joint refereed proceedings of the 5th International Workshop on Quality of Future Internet Services, QofIS 2004, the First International Workshop on Qos Routing, WOoSR 2004, and the 4th International Workshop on Internet Charging and Qos Technology, ICQT 2004, held in Barcelona, Spain, in September/October 2004. The 38 revised full papers presented were carefully reviewed and selected from a total of around 140 submissions. The papers are organized in topical sections on Internet applications, local area and ad-hoc wireless networks, service differentiation and congestion control, traffic engineering and routing, enforcing mobility, algorithms and scalability for service routing, novel ideas and protocol enhancements, auctions and game theory, charging in mobile networks, and QoS provisioning and monitoring.
Qos And Energy Management In Cognitive Radio Network
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Author : Vishram Mishra
language : en
Publisher: Springer
Release Date : 2016-10-25
Qos And Energy Management In Cognitive Radio Network written by Vishram Mishra and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016-10-25 with Technology & Engineering categories.
This book covers the important aspects involved in making cognitive radio devices portable, mobile and green, while also extending their service life. At the same time, it presents a variety of established theories and practices concerning cognitive radio from academia and industry. Cognitive radio can be utilized as a backbone communication medium for wireless devices. To effectively achieve its commercial application, various aspects of quality of service and energy management need to be addressed. The topics covered in the book include energy management and quality of service provisioning at Layer 2 of the protocol stack from the perspectives of medium access control, spectrum selection, and self-coexistence for cognitive radio networks.
Resource Allocation In Next Generation Wireless Networks
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Author : Wayne Li
language : en
Publisher: Nova Publishers
Release Date : 2006
Resource Allocation In Next Generation Wireless Networks written by Wayne Li and has been published by Nova Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Computers categories.
Next generation wireless and mobile communication systems are rapidly evolving to satisfy the demands of various network users. Due to the great success and enormous impact of IP networks, high-speed transmission is now possible for both indoor and outdoor wireless systems, internet access and web browsing have become the ruling paradigm for next generation system. It is envisioned that new generation wireless networks and hand-held terminals will support a wide variety of multimedia services such as multimedia web browsing, video and news on demand, mobile office system, stock market information, and so on, to mobile users anywhere, anytime in an uninterrupted and seamless way with low-powered handsets. The characteristics of wireless links, as well as the desire to maintain connectivity while on the move, offer significant challenges to provisioning quality of service and the related performance is of central interest. Since the resources (such as time, frequency and code) in the wireless segments of such networks are very limited, over-dimensioning the network resource is equivalent to poor capital investment, while congestion at busy hours could mean lost calls and lost revenues. It is therefore critical for wireless network designers to utilise these resources efficiently and effectively. In response to the above demand for next generation wireless and mobile communication systems, this book aims at providing a timely and concise reference of the current activities and findings in the relevant technical fields. The primary goal is to address the key technical issues pertaining to the integrated new systems and present novel technical contributions. The book contains 14 invited chapters from prominent researchers working in this area around the world.
Quality Of Service In Multiservice Ip Networks
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Author : Marco Ajmone Marsan
language : en
Publisher: Springer
Release Date : 2005-01-28
Quality Of Service In Multiservice Ip Networks written by Marco Ajmone Marsan and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2005-01-28 with Computers categories.
This book constitutes the refereed proceedings of the Third International Workshop on Quality of Service in Multiservice IP Networks, QoS-IP 2005, held in Catania, Italy in February 2005. The 50 revised full papers presented were carefully reviewed and selected from around 100 submissions. The papers are organized in topical sections on analytical models, traffic characterization, MPLS failure and restoration, network planning and dimensioning, DiffServ and InfServ, routing, software routers, network architectures for QoS provisioning, multiservice in wireless networks, TCP in special environments, and scheduling.
Quality Of Service Architectures For Wireless Networks Performance Metrics And Management
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Author : Adibi, Sasan
language : en
Publisher: IGI Global
Release Date : 2010-01-31
Quality Of Service Architectures For Wireless Networks Performance Metrics And Management written by Adibi, Sasan and has been published by IGI Global this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010-01-31 with Computers categories.
"This book further explores various issues and proposed solutions for the provision of Quality of Service (QoS) on the wireless networks"--Provided by publisher.