Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 89
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Book Description
Next generation wireless and mobile cellular networks are expected to support multimedia applications. High user mobility and inherent instability of wireless channels make quality of service (QoS) provisioning a challenging issue in wireless and mobile networks. In this thesis, we propose a novel concept of time adaptability and introduce two adaptive time bandwidth allocation schemes, namely, adaptive time period (ATP) and flexible adaptive time period (FATP) for QoS provisioning in wireless and mobile cellular networks for variable bandwidth multimedia calls. With time adaptability, each call not only specifies the minimum and maximum bandwidth requirements in terms of basic bandwidth units (bbu), but also specifies a step size and an adaptive period. Step size is the bbu constituting each layer of adaptive multimedia. Adaptive period is the time period specified by a call over which the bandwidth change incurred by the call cannot exceed the step size for that call. This, accompanied by temporary bandwidth borrowing from the ongoing calls not only reduces forced termination probability of handoff calls and ensures that each call gets a fare share of the available system bandwidth but also helps to decrease large bandwidth fluctuations at the end mobile users running multimedia applications such as video conferencing or online gaming. Extensive simulation results show that our proposed schemes maintain a low forced termination probability for handoff calls and significantly reduce bandwidth variations.
Author: Wayne Li
Publisher: Nova Publishers
ISBN: 9781594545832
Category : Computers
Languages : en
Pages : 366
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Book Description
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.
Author: Erwin Rathgeb
Publisher: Springer
ISBN: 3642121047
Category : Computers
Languages : en
Pages : 333
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Book Description
This book constitutes the refereed proceedings of the 15th International GI/ITG Conference on "Measurement, Modelling and Evaluation of Computing Systems" and "Dependability and Fault Tolerance", held in Essen, Germany, in March 2010. The 19 revised full papers presented together with 5 tool papers and 2 invited lectures were carefully reviewed and selected from 42 initial submissions. The papers cover all aspects of performance and dependability evaluation of systems including networks, computer architectures, distributed systems, software, fault-tolerant and secure systems.
Author: Liansheng Tan
Publisher: CRC Press
ISBN: 1498769454
Category : Technology & Engineering
Languages : en
Pages : 503
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Book Description
This book provides a comprehensive introduction to the underlying theory, design techniques and analytical results of wireless communication networks, focusing on the core principles of wireless network design. It elaborates the network utility maximization (NUM) theory with applications in resource allocation of wireless networks, with a central aim of design and the QoS guarantee. It presents and discusses state-of-the-art developments in resource allocation and performance optimization in wireless communication networks. It provides an overview of the general background including the basic wireless communication networks and the relevant protocols, architectures, methods and algorithms.
Author: José Neuman De Souza
Publisher: Springer Science & Business Media
ISBN: 3540225714
Category : Computers
Languages : en
Pages : 1415
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Book Description
This book constitutes the refereed proceedings of the 11th International Conference on Telecommunications, ICT 2004, held in Fortaleza, Brazil in August 2004. The 188 revised full papers presented were carefully reviewed and selected from 430 submissions. The papers are organized in topical sections on multimedia services, antennas, transmission technologies and wireless networks, communication theory, telecommunication pricing and billing, network performance and telecommunication services, active network and mobile agents, optical photonic techniques, optical networks, ad-hoc networks, signal processing, network performance and MPLS, traffic engineering, SIP, Qos and switches, network operation management, mobility and broadband wireless, cellular system evolution, personal communication, satellites, mobility management, network reliability, ATM and Web services, security, switching and routing, next generation systems, wireless access, Internet, etc.
Author: Cranley, Nicola
Publisher: IGI Global
ISBN: 159904823X
Category : Computers
Languages : en
Pages : 544
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Book Description
"This book highlights and discusses the underlying QoS issues that arise in the delivery of real-time multimedia services over wireless networks"--Provided by publisher.
Author: Yuan Wu
Publisher: Springer
ISBN: 3319510371
Category : Technology & Engineering
Languages : en
Pages : 86
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Book Description
This SpringerBrief offers two concrete design examples for traffic offloading. The first is an optimal resource allocation for small-cell based traffic offloading that aims at minimizing mobile users’ data cost. The second is an optimal resource allocation for device-to-device assisted traffic offloading that also minimizes the total energy consumption and cellular link usage (while providing an overview of the challenging issues). Both examples illustrate the importance of proper resource allocation to the success of traffic offloading, show the consequent performance advantages of executing optimal resource allocation, and present the methodologies to achieve the corresponding optimal offloading solution for traffic offloading in heterogeneous cellular networks. The authors also include an overview of heterogeneous cellular networks and explain different traffic offloading paradigms ranging from uplink traffic offloading through small cells to downlink traffic offloading via mobile device-to-device cooperation. This brief is an excellent resource for postgraduate students studying advanced-level topics in wireless communications and networking. Researchers, engineers and professionals working in related fields will also find this brief a valuable resource tool.
Author:
Publisher:
ISBN:
Category : Computer networks
Languages : en
Pages : 170
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 99
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Book Description
As a wide variety of services are being made available for users in a wireless and mobile network, the type of traffic is not limited to voice anymore, rather applications such as web browsing, email, video messaging, etc., which generate non-voice traffic, are also gaining increasing popularity. With the growth of these bandwidth hungry multimedia services, there is an immediate need for a resource management scheme which exploits the flexible bandwidth requirements of these new traffic classes. In this thesis, we present and analyze a novel resource management scheme, namely Dynamic Adaptive Resource Allocation (DARA), which is specially tailored to support the emerging classes of multimedia traffic in a wireless and mobile network. From the extensive simulation results, it is evident that our scheme achieves better performance with regard to traditional Quality of Service (QoS) parameters such as the call blocking probabilities of originating and handoff calls while significantly reducing the bandwidth reallocation frequency experienced by a call when compared to similar flexible resource allocation schemes. Higher priority handoff calls are also efficiently handled in our proposed scheme by a combined approach of channel reservation and bandwidth borrowing from ongoing calls at heavy traffic loads.
Author: Ivan Stojmenovic
Publisher: Springer Science & Business Media
ISBN: 3540747427
Category : Computers
Languages : en
Pages : 1013
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Book Description
This book constitutes the refereed proceedings of the 5th International Symposium on Parallel and Distributed Processing and Applications, ISPA 2007, held in Niagara Falls, Canada, in August 2007. The 83 revised full papers presented together with three keynote are cover algorithms and applications, architectures and systems, datamining and databases, fault tolerance and security, middleware and cooperative computing, networks, as well as software and languages.
