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An analysis of the effects of mobility on bandwidth allocation strategies in multi-class cellular wireless networks

An analysis of the effects of mobility on bandwidth allocati...

引用

IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： K. Mitchell K. Sohraby Computer Science Telecommunications Program University of Missouri Kansas City Kansas City MO USA

ISBN: (纸本)0780370163

In this paper we present a multi-cell analytic model for multi-class cellular networks. We investigate the effects subscriber mobility has on bandwidth control strategies when the network supports multiple classes of subscribers having different bandwidth requirements. We introduce control strategies from non-mobile networks and examine them in a mobile environment. The expressions for call blocking using these control strategies have product form solutions. This allows us to develop a multi-cell, multi-class, model by generalizing on the Erlang fixed point approximation using generalized multi-rate, multi-class, Erlang loss formulas for each class of traffic. We produce expressions for originating calls lost, hand-off calls lost, forced-termination, and mean channel occupancy for each class of traffic in each cell for different control strategies. The multicell analytic model allows us to investigate the effects of asymmetric loads and mobility patterns in the network. The analytic results are supported by simulation.

关键词： Channel allocation Traffic control Land mobile radio cellular systems Bandwidth Communication system traffic control Cellular networks Cities and towns Pattern analysis Quality of service Intelligent networks

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A bandwidth adaptation scheme to support QoS requirements of mobile users in wireless environments 9

A bandwidth adaptation scheme to support QoS requirements of...

引用

9th International Conference on computer Communications and Networks, ICCCN 2000

作者： Aljadhai, AbdulRahman Znati, Taieb F. Computer Technology Department Riyadh College of Technology Riyadh Saudi Arabia Department of Computer Science Telecommunications Program University of Pittsburgh PittsburghPA15260 United States

ISBN: (纸本)0780364945

- This paper presents an adaptive QoS management scheme to accommodate dynamic variations in network resources, due to the mobility of the users and location-dependent errors. The scheme ensures that satisfactory level of QoS guarantees are met regardless of the user mobility. QoS adaptation is achieved based on the use of application specific quality satisfaction curves, while enforcing a fair allocation of bandwidth among the competing flows. The performance of the proposed scheme is evaluated and results indicate that the scheme yields fair adaptation under heavy loads. © 2000 IEEE

关键词： Quality of service

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A bandwidth adaptation scheme to support QoS requirements of mobile users in wireless environments

A bandwidth adaptation scheme to support QoS requirements of...

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International Conference on computer Communications and Networks (ICCCN)

作者： A. Aljadhai T.F. Znati Computer Technology Department Riyadh College of Telecommunications Riyadh Saudi Arabia Department of Computer Science Telecommunications Program University of Pittsburgh Pittsburgh PA USA

This paper presents an adaptive QoS management scheme to accommodate dynamic variations in network resources, due to the mobility of the users and location-dependent errors. The scheme ensures that satisfactory levels of QoS guarantees are met regardless of the user mobility. QoS adaptation is achieved based on the use of application specific quality satisfaction curves, while enforcing a fair allocation of bandwidth among the competing flows. The performance of the proposed scheme is evaluated and results indicate that the scheme yields fair adaptation under heavy loads.

关键词： Bandwidth Quality of service Degradation Resource management Mobile computing computer networks Telecommunication traffic Intelligent networks Educational institutions computer network management

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A dual-hybrid adaptive routing strategy for wireless ad-hoc networks

A dual-hybrid adaptive routing strategy for wireless ad-hoc ...

引用

2000 IEEE Wireless Communications and Networking Conference

作者： McDonald, A. Bruce Znati, Taieb University of Pittsburgh Telecommunications Program Pittsburgh PA United States University of Pittsburgh Department of Computer Science Pittsburgh PA United States Children's Hospital of Pittsburgh Department of Neurophysiology Pittsburgh PA United States

ISBN: (纸本)0780365968

Recent debate in the research community has focused around the following question: should the design of routing algorithms for ad-hoc networks be predicated upon the minimization of routing overhead, or the optimization of network paths? The answer to this question depends upon the mobility and traffic characteristics present in the network. It is doubtful that any one approach by itself can be optimal, or even sufficient when there are temporal and spatial changes in the network dynamics. Most proposed solutions have adopt a fixed approach. To address this shortcoming we propose a dynamic cluster-based routing strategy that shifts the characteristics of its routing approach according to localized network dynamics. This is achieved by dividing routing into intra-cluster and inter-cluster components utilizing a strategy that is hybrid in terms of both its route acquisition and path computation approaches. By adapting the cluster organization to node mobility the strategy senses the network and balances optimality and overhead. The reason for doing this is to achieve the best possible performance subject to a wide range of operating environments.

关键词： Wireless telecommunication systems

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Permutation routing in all-optical product networks 13th

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13th International Parallel Processing Symposium, IPPS 1999 Held in Conjunction with the 10th Symposium on Parallel and Distributed Processing, SPDP 1999

作者： Liang, Weifa Shen, Xiaojun Department of Computer Science Australian National University CanberraACT0200 Australia Computer Science Telecommunications Program University of Missouri-Kansas City Kansas CityMO64110 United States

ISBN: (纸本)3540658319

In this paper we study permutation routing techniques for all-optical networks. Firstly, we show some lower bounds on the number of wavelengths needed for implementing any permutation on an alloptical network in terms of bisection of the network. Secondly, we study permutation routing on product networks by giving a lower bound on the number of wavelengths needed, and presenting permutation routing algorithms for the wavelength non-conversion and conversion models, respectively. Finally, we investigate permutation routing on a cube-connectedcycles network by showing that the number of wavelengths needed for implementing any permutation in one round is [2 log nJ, which improves on a previously known general result for bounded degree graphs by a factor of O(log3 n) for this special case. © Springer-Verlag Berlin Heidelberg 1999.

关键词： Network routing

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A predictive, adaptive scheme to support QoS guarantees in Multimedia Wireless Networks

A predictive, adaptive scheme to support QoS guarantees in M...

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1999 IEEE International Conference on Communications, ICC 1999

作者： Aljadhai, AbdulRahman Znati, Taieb F. Department of Computer Science University of Pittsburgh PittsburghPA15260 United States Telecommunications Program University of Pittsburgh PittsburghPA15260 United States

ISBN: (纸本)078035284X

This paper presents a predictive and adaptive scheme to support timed-QoS guarantees, in a pico and micro-cellular environments. The proposed scheme integrates the mobility model into the service model to achieve efficient network resource utilization and avoid severe network congestion. The mobility model uses a probabilistic approach to determine the Most Likely Cluster (MLC) to be visited by the mobile unit. The admission control is invoked when a new call arrives or an existing call performs a hand-off to verify the feasibility of supporting the call. The performance of the proposed schemes is compared to the shadow cluster scheme [6]. © 1999 IEEE.

关键词： Quality of service

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A framework for call admission control and QoS support in wireless environments

A framework for call admission control and QoS support in wi...

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： A. Aljadhai T.F. Znati Department of Computer Science University of Pittsburgh Pittsburgh PA USA Department of Computer Science Telecommunications Program University of Pittsburgh Pittsburgh PA USA

With the proliferation of wireless networks technologies, mobile users are expected to demand the same quality-of-service (QoS) available to fixed users. This paper presents a framework to support predictive timed-QoS guarantees, in wireless environments. The main components of this framework include a service model for QoS guarantees, a path predictability model, and a call admission control scheme. The unique feature of this framework is the ability to combine the path predictability model with the call admission control to determine the level of predictive timed-QoS guarantees that the network can provide over a predetermined interval of time. The performance of the call admission control scheme, in terms of the dropping ratio of hand-off calls and the blocking ratio of new calls, is presented.

关键词： Call admission control Quality of service Base stations Predictive models Wireless LAN Wireless networks Switches Bandwidth Delay estimation Intelligent networks

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Design and analysis of a quantum-based QoS-aware fair share server for integrated services networks

Design and analysis of a quantum-based QoS-aware fair share ...

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Annual Symposium on Simulation

作者： M.S. Boykin T.F. Znati Computer Science Department University of Pittsburgh Pittsburgh PA USA Computer Science Department Telecommunications Program University of Pittsburgh Pittsburgh PA USA

Discrete service disciplines have been shown capable of emulating the ideal generalized processor sharing (GPS) discipline within one maximum-sized packet's transmission time. As a result, the accuracy of such schemes increases with improvements in link speed due to the corresponding reduction in packet transmission delay. However the merits of such accuracy diminish with improvements in link speed as the impact on call admission decisions decreases. Meanwhile, overhead, in terms of the number of scheduling decisions to be made per unit time, increases with the number of packets transmitted. In response, this paper presents an overview of the QFQ service discipline which enables GPS emulation servers to dynamically "tune" their service quanta at run-time based upon the QoS requirements of their currently backlogged connections rather than the statically defined maximum network packet size. Through simulation, the paper also demonstrates how the overhead of a GPS emulation server can be reduced in high speed networks without jeopardizing QoS guarantees or adversely impacting fairness.

关键词： Network servers Intserv networks Global Positioning System Emulation computer science Runtime Web server Web sites Telecommunication traffic High-speed networks

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A split input sunshine switch architecture

A split input sunshine switch architecture

引用

IEEE International Conference on Performance, Computing and Communications (IPCCC)

作者： T. Bearly J.P. Agrawal AT and T Kansas City MO USA Computer Science Telecommunications Program University of Missouri Kansas City Kansas City MO USA

We present the split input sunshine switch, a new ATM switch architecture based on the sunshine switch, which utilizes two distinct input fabrics, primary and secondary, within a sunshine switch architecture. The primary input fabric is sized at the desired size, N/spl times/N, and the secondary switch is sized at N/z /spl times/ N/z, where z is a non-zero power of two. The introduction of the secondary input fabric allows a portion of the primary input fabric's input lines to be used to handle recirculating cells. For medium and large switch sizes, the hardware requirements of this new architecture is shown to be less than that of the original sunshine design for the same quality of service. computer simulations have been performed on the sunshine switch and the split input sunshine switch in order to select design parameters and compare performance.

关键词： Switches Asynchronous transfer mode Telecommunication switching Delay computer architecture Cities and towns Fabrics Telecommunication traffic Costs ISDN

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End-to-end jitter analysis in networks of periodic flows

End-to-end jitter analysis in networks of periodic flows

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IEEE Annual Joint Conference: INFOCOM, IEEE computer and Communications Societies

作者： K. Sohraby A. Privalov Comput. Sci. Telecommun. Program Missouri Univ. Kansas City MO USA Computer Science Telecommunications University of Missouri Kansas City Kansas City MO USA

Constant bit rate (CBR) traffic is expected to be an important traffic source in high-speed networks. Such sources usually have stringent delay and loss requirements and in many cases they should be delivered exactly as they were generated. A simple delay priority scheme in the network nodes will bound the delay and delay jitter for CBR traffic so that the CBR flows with stringent QoS will only compete with similar traffic flows within the network. We extend the work of Privalov and Sohraby (see IEEE/ACM Trans. on Networking, 1998) to a networking environment and provide the end-to-end jitter analysis of feed-forward connection-oriented networks supporting multiplexed CBR connections. The impact of the traffic mix in each node and the number of nodes in the network on the end-to-end jitter of individual flows are examined.

关键词： Jitter Intelligent networks Telecommunication traffic Asynchronous transfer mode Delay Quality of service Cities and towns computer science Bit rate High-speed networks

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