by Ho, L. Lawrence

DOI: 10.1023/A:1018745211720
Print publication date: 12/1/1998
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by Ejiri, Masayoshi; Park, Jong-Tae; Okazaki, Hiroyuki; Hong, James W.

DOI: 10.1023/A:1018793127649
Print publication date: 12/1/1998
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by Keller, Ludwig

Trading based systems are tailored to handle acomplex number of system resources in distributed,permanently changing environments. These resources areusually represented by their service descriptions offered to a trader. In contrast to theconventional approach in which a service is provided byonly one service object, we propose an extended tradingconcept to maintain and to manage services in open distributed systems. It allows to mediatevalue-added services. These are either reliable servicesguaranteeing independence and autonomy of the serviceobjects or complex services that are defined by the functional composition of existing services.They are done by the cooperation of different serviceobjects. In this paper we present this extended tradingapproach and describe our system AGORA that implements the extended service model and the mediation ofvalue-added service in an open distributedsystem.

DOI: 10.1023/A:1018741110811
Print publication date: 12/1/1998
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by Grover, W. D.; Hayer, J. S.

We describe a system concept for therevenue-producing disposition of surplus capacity atoff-peak times in real trunking networks. The idea is toapproximate a competitive market for distribution of the networks’ time-varying excess capacity with apricing strategy controlled by the network. The schemeis intended to allow network operators to stimulatebackground traffic loads to gain new revenues from otherwise idle time on existing installedresources. The concept is suitable for low prioritydelay-tolerant or opportunistic applications such asremote backups, software distribution, dispatchingbatched faxes, disseminating newsgroup updates,updating web page caches or routing tables. Backgroundservice subscribers are notified of price reductions atoff-peak times to elicit additional traffic for the network. Traffic aggregators act on behalf ofsubscribing organizations or groups of users. Thebackground service is completely subordinate to theconventional tariff-priced on-demand calling services and the variable background pricing merges withthe foreground under suitable total load. This paperfocuses on the network problem of price setting tocontinually maximize the price-volume product in a time-varying price-sensitive trafficenvironment such as this concept implies. Aprice-stimulated offered traffic environment issimulated in which time of day, price, and hidden demandlatency and demand curve characteristics all affect the offeredtraffic. An analytically optimum strategy is availablefor the particular traffic model used and theperformance of a fuzzy logic price controller is tested against the revenue-optimal strategy. Dependingon econometric assumptions for latent traffic demand andprice-volume curves, increases in revenue from 4%-20%are obtained in simulation of a 30-trunk group having a typical daily load pattern.

DOI: 10.1023/A:1018789026741
Print publication date: 12/1/1998
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by Ibraheem, Sule O.; Kokar, Mieczyslaw M.; Lewis, Lundy

This paper describes a method for constructingbehavior models of communication networks. The methodutilizes archived quantitative performance data createdby a network management platform to create a Quantitative/Qualitative (Q²)Dynamic System representation. The Q²representation captures the predominant qualitative(symbolic) states of the network, qualitative inputevents and transitions among the states resulting from these events. Thissymbolic model allows the network manager to understandthe current system behavior, and predict future possiblebehaviors. We evaluated the method on two sets of archive data. The method shows promise foruse in network management, including network monitoring,fault detection, prognostication andavoidance.

DOI: 10.1023/A:1018737009902
Print publication date: 12/1/1998
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by Tsaih, D.; Lapiotis, G.; Panwar, S.; Tassiulas, L.

In this paper we describe a network modelingapproach intended to assist in the performancemanagement, design, and optimization of broadbandtraffic networks. Switch and source models, as well asrouting optimization and decision support algorithmshave been integrated in a prototype software tool,called DATANMOT (Data Network Modeling and OptimizationTool). The switch models developed are based on standard Frame Relay and ATM switch implementations.Specifically, an analytical model of the Fujitsu FETEX150 ATM switch is described here in detail. Fluid-flowapproximation methods were used for performance evaluation, with computational complexity lowenough for near-real time applications. As a result,given the network configuration and input traffic, anevaluation of the quality of service can be derived and used in optimal routing, admission controland network planning. These techniques have beenincorporated in our modeling tool to demonstrate themodel-based approach to network management. In addition, all configuration, modeling, and managementfunctions of the software tool are supported by agraphical user interface, and a databasesystem.

DOI: 10.1023/A:1018784925832
Print publication date: 12/1/1998
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by Oki, Eiji; Yamanaka, Naoaki

This paper proposes a new topological designmethod, named BXCQ, which optimizes logical networkconfiguration while guaranteeing Quality-of-Service(QoS) requirements for each service class in an ATMnetwork. The BXCQ method determines the optimum logicalnetwork topology associated with each service class soas to minimize network cost. In our previously proposedFull-Net architecture these different logical topologies can be suitably mapped at the sametime on the same ATM physical network by using theVirtual Channel Handler (VCH) to create differentlogical interconnection networks. The BXCQ method allows us to clarify the relations between multimediatraffic characteristics and desirable logical networkconfigurations in Full-Net. Evaluation results suggestthat a service class that is bursty, delay tolerant, and cell loss sensitive with small demandshould be supported by a loop-like topology. This studywill be useful for designing flexible and cost-effectivemultimedia networks that can also adapt to not-yet-known services.

DOI: 10.1023/A:1018732808994
Print publication date: 12/1/1998
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by Bernstein, Lawrence; Yuhas, C. M.

DOI: 10.1023/A:1018799824924
Print publication date: 12/1/1998
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