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Providing seamless handoff in wireless ATM networks

Providing seamless handoff in wireless ATM networks

引用

International Conference on computer Communications and networks (ICCCN)

作者： Dong-Ho Kim Hyung-Jun Kim Dongjin Han WonKeun Choi Sunshin An Computer Network Laboratory Department of Electronic Engineering Korea University South Korea Department of Information & Communication Inha Technical College

ISBN: (纸本)0818690143

One of challenges of the WATM is providing the negotiated QoS during handoff. It should be considered that the virtual connection cannot always meet guaranteed QoS in wireless environment during/after the handoff execution due to mobility management, limited radio resources and fluctuating network conditions. Micro cell size, which produces more handoff makes it more difficult. An adaptive QoS management scheme is required in order to minimize dropping the virtual connection. We design a handoff network model and cell structure for seamless handoff scheme in WATM networks. In order to realize adaptive QoS management we also adapt the dynamic state at which QoS re-negotiation is executed to meet the negotiated QoS during handoff. In order to localize the impacts of handoff and enable fast and reliable handoff we design the seamless handoff scheme which provides efficient inter-cluster handoff and propose location management with multi-tier addressing based on the network model for QoS-based multimedia services.

关键词： Intelligent networks computer networks Telecommunication network reliability Mobile communication Wireless networks Educational institutions Mobile radio mobility management Fluctuations computer network management Videoconference

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Cascade recursive least squares with subsection adaptation for AR parameter estimation

Cascade recursive least squares with subsection adaptation f...

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International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

作者： G. Zakaria A.A. Beex Systems Group DSP Research Laboratory The Bradley Department of Electrical and Computer Engineering Virginia Technology Blacksburg VA USA Hughes Network Systems Germantown MD USA Bradley Department of Electrical and Computer Engineering Virginia Technology Blacksburg VA USA

We propose the adaptive cascade recursive least squares (CRLS-SA) algorithm for the estimation of linear prediction, or AR model, coefficients. The CRLS-SA algorithm features low computational complexity since each section is adapted independently from the other sections. It is shown that the CRLS-SA algorithm can yield AR coefficient estimates closer to the true values, for some known signals, than the widely used autocorrelation method. The CRLS-SA converges faster to the true values of the model, which is critically important for estimation from short data records. While the computational effort of CRLS-SA is a factor of 3 to 4 higher than that for the autocorrelation method, the improvement in performance yields a viable alternative for a number of applications.

关键词： Least squares approximation Parameter estimation Autocorrelation Filters Bit rate Speech coding Recursive estimation Predictive models Resonance light scattering Digital signal processing

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ATM customer network management using WWW and CORBA technologies

ATM customer network management using WWW and CORBA technolo...

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IEEE Symposium on network Operations and Management

作者： Jong-Wook Baek Tae-Joon Ha Jong-Tae Park J.W. Hong Seong-Beom Kim School of Electronic and Electrical Engineering Kyungpook National University South Korea Department of Computer Science and Engineering Information Research Laboratories PIRL Pohang University of Science and Technology South Korea Telecommunication Network Research Laboratory Korea Telecom South Korea

In this paper, we present a framework for managing ATM customer networks using WWW and CORBA technologies. The WWW technology may provide network management operators with platform independence, location independence, friendly and/or consistent management behavior as well as secure management operations. The main problems in a Web-based network management system may include limited management capabilities of HTTP operations and lack of supporting mechanisms for trap or event notifications. These problems are, in this paper, solved by the integration of Java and CORBA technologies. We extend the current Web technology which is being used for transferring various information on Internet to those which can be used to transfer management requests and replies as well as event notifications. A Web browser is used as a universal user interface for monitoring and controlling the activities of the ATM customer networks. We have developed an integrated customer network management system which can manage SNMP-enabled or CMIP-enabled network devices and provide ATM CNM services. In particular, we applied the CORBA technology to accommodate several management protocols such as SNMP, CMIP and other management protocols. Through the CORBA IDL-to-Java mapping, complex management operations as well as event notifications are supported without modification of the current WWW systems.

关键词： Technology management World Wide Web Protocols Monitoring computer network management User interfaces Virtual private networks Java computer science Telecommunications

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A real-time communication method for wormhole switching networks

A real-time communication method for wormhole switching netw...

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International Conference on Parallel Processing (ICPP)

作者： Byungjae Kim Jong Kim Sungje Hong Sunggu Lee Access Network Research Laboratory Korea Telecom Taejon South Korea Department of Computer Science and Engineering Pohang University of Science and Technology Pohang South Korea Department of Electronic and Electrical Engineering Pohang University of Science and Technology Pohang South Korea

ISBN: (纸本)0818686502

In this paper we propose a real-time communication scheme that can be used in general point-to-point real-time multicomputer systems with wormhole switching. Real-time communication should satisfy the two requirements of predictability and priority handling. Since traditional wormhole switching does not support priority handling which is essential in real-time computing, flit-level preemption is adopted in our wormhole switching. Also, we develop an algorithm to determine the message transmission delay upper bound to predict worst-case message delay. Simulation results show that the delay upper bounds calculated using the proposed algorithm are very close to actual average message transmission delays for messages with high priorities.

关键词： Communication switching Timing Delay effects Multiprocessing systems computer worms Upper bound Real time systems Sufficient conditions Telecommunication switching Laboratories

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A detailed experimental performance evaluation on TCP over UBR

A detailed experimental performance evaluation on TCP over U...

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IEEE International Conference on ATM

作者： L. Jaussi M. Lorang J. Nelissen Telecommunications Laboratory Swiss Federal Institute of Technology Lausanne Switzerland Inst. of Communication Networks and Computer Engineering University of Stuttgart Stuttgart Germany Network Architecture Traffic Technology Team Alcatel-Alsthom Corporate Research Center Belgium

The ATM service category UBR is intended for non-real-time applications that do not require guaranteed QoS commitments. With additional, relatively inexpensive control functions such as packet discard schemes, UBR could become a cost-effective alternative for the transmission of data traffic; offering a straightforward and flexible solution as opposed to nrt-VBR and GFR that applies stricter traffic specifications as well as ABR with its sophisticated and complex rate-control protocol. This paper presents the results obtained from a comprehensive set of experiments with TCP over UBR, comprising of measurements taken on different protocol layers. The goal is to experimentally investigate the performance of UBR to carry TCP traffic, to evaluate the performance gain achievable by packet discard schemes and TCP parameter tuning, to study the influence of the TCP implementation, and in a final step, to relate the measurements to simulation results.

关键词： Asynchronous transfer mode Traffic control Switches Protocols Size measurement Laboratories Communication networks computer networks Telecommunication computing computer architecture

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Performance of QoS based multicast routing algorithms for real-time communication

Performance of QoS based multicast routing algorithms for re...

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Performance and Control of network Systems

作者： Verma, Sanjeev Pankaj, Rajesh K. Leon-Garcia, Alberto Network Architecture Laboratory Department of Electrical and Computer Engineering University of Toronto Toronto ON M5S 3G4 Canada

In recent years, there has been a lot of interest in providing real-time multimedia services like digital audio and video over packet-switched networks such as Internet and ATM. These services require certain quality of service (QoS) from the network. The routing algorithm should take QoS factor for an application into account while selecting the most suitable route for the application. In this paper, we introduce a new routing metric and use it with two different heuristics to compute the multicast tree for guaranteed QoS applications that need firm end-to-end delay bound. We then compare the performance of our algorithms with the other proposed QoS-based routing algorithms. Simulations were run over a number of random networks to measure the performance of different algorithms. We studied routing algorithms along with resource reservation and admission control to measure the call throughput over a number of random networks. Simulation results show that our algorithms give a much better performance in terms of call throughput over other proposed schemes like QOSPF.

关键词： Quality of service

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Scalable hardware priority queue architectures for high-speed packet switches

Scalable hardware priority queue architectures for high-spee...

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3rd IEEE Real-Time Technology and Applications Symposium

作者： Moon, SW Shin, KG Rexford, J Real-Time Computing Laboratory Dept. of Electrical Engineering and Computer Science University of Michigan Ann Arbor MI 48109 United States Network Mathematics Research Networking and Distributed Systems ATandT Labs Research Murray Hill NJ 07974 United States

ISBN: (纸本)0818680164

In packet-switched networks, queueing of packets at the switches can result when multiple connections share the same physical link. To accommodate a large number of connections, a switch can employ link-scheduling algorithms to prioritize the transmission of the queued packets. Due to the high-speed links and small packet sizes, a hardware solution is needed for the priority queue in order to make the link schedulers effective. But for good performance, the switch should also support a large number of priority levels (P) and be able to buffer a large number of packets (N). So a hardware priority queue design must be both fast and scalable (with respect to N and P) in order to be implemented effectively. In this paper, we first compare four existing hardware priority queue architectures, and identify scalability limitations on implementing these existing architectures for large N and P. Based on our findings, we propose two new priority queue architectures, and evaluate them using simulation results from Verilog HDL and Epoch implementations.

关键词： computer architecture

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Fade margins for minimum duration outages in lognormal shadow fading and Rayleigh fading

Fade margins for minimum duration outages in lognormal shado...

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Asilomar Conference on Signals, Systems & computers

作者： Jie Lai N.B. Mandayam Wireless Information Network Laboratory (WINLAB) Department of Electrical & Computer Engineering Rutgers University Piscataway NJ USA

Minimum duration outages have been used to characterize time-dependent performance in analysis of quantities such as average duration of an outage, the probability of outage, and the frequency of outage, in lognormal shadow fading (Mandayam et al., 1996) and Rayleigh fading (Lai and Mandayam, 1997), respectively. In this paper, we compare and contrast the effect of minimum duration outages on fade margin selection in channels subject to lognormal shadow fading and Rayleigh fading. A comparative analysis of relevant minimum durations for lognormal shadow fading and Rayleigh fading reveals the widely different time-scales active in outage considerations for each type of fading. Further, it is observed that lognormal shadow fading impacts outage on a time-scale that is much larger than that due to Rayleigh fading. The distinct time-scales revealed by the analysis show that the time-scales determined by the application govern the relative importance of the type of fading.

关键词： Rayleigh channels Performance analysis Frequency Signal analysis Fading Intelligent networks Laboratories computer networks Degradation Power control

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SIR estimation in CDMA cellular systems using subspace tracking

SIR estimation in CDMA cellular systems using subspace track...

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Asilomar Conference on Signals, Systems & computers

作者： D. Ramakrishna N.B. Mandayam R.D. Yates Department of Electrical & Computer Engineering Wireless Information Network Laboratory WINLAB Rutgers University Piscataway NJ USA

Several radio resource management algorithms such as power control and handoff use the signal-to-interference ratio (SIR) as a control parameter. We address the problem on how to obtain fast and accurate measurements of this quantity in the context of a time varying channel. We develop, a subspace based SIR tracking algorithm for CDMA cellular systems. Analysis and simulation results for an IS-95 like system show that the SIR can be estimated to within 80 percent of the actual SIR after less than 7 frames, or within 90 percent of the actual SIR after less than 15 frames.

关键词： Multiaccess communication Power control Interference Diversity reception Propagation delay Intelligent networks Laboratories computer networks Binary search trees Resource management

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Design and implementation of internetworking system between ATM and PSTN

Design and implementation of internetworking system between ...

引用

International Conference on Information, Communications and Signal Processing

作者： Sung-Woo Tak Shin-Young Lim Chang-Soon Park Jung-Tae Lee Network Security Laboratory Systems Engineering Research Institute Taejon South Korea Department of Computer Engineering Pusan National University Kumjong South Korea

ISBN: (纸本)0780336763

We design and implement the internetworking system between the ATM network and PSTN, which provides telephone services between the clients of the ATM network and subscribers of the PSTN. The internetworking system consists of the PSTN I/F module, signaling processing module, voice sampling module, voice regeneration module, transmission module, and ATM I/F module. The PSTN I/F module and ATM I/F module are implemented by using the existing commercial hardware products. However, the other 4 modules are implemented for the WIN95 environments by software. The test environment was also implemented and it was found that the internetworking system operates without problems.

关键词： Internetworking Signal processing Telephony Signal sampling Signal detection Phase change materials Signal generators Design engineering System testing Control systems

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