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IEE Eleventh UK Teletraffic Symposium, 11th. Performance Engineering in Telecommunications Networks

23-25 Mar 1994

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Displaying Results 1 - 25 of 40
  • Distributed cooperative agents for service management in communications networks

    Publication Year: 1994, Page(s):24/1 - 24/7
    Cited by:  Papers (1)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (300 KB)

    This paper concentrates on issues of resilience and fault tolerance of cooperative intelligent agents (complex software systems), introducing some basic concepts of global multiservice networks, and identifying service provision and restoration as problem areas. The distributed nature of the network of agents gives scope for reducing the total amount of data passed to a central point, and so impro... View full abstract»

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  • Signalling network design tools

    Publication Year: 1994, Page(s):26/1 - 26/8
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (440 KB)

    Additional methods must be used to design and dimension networks which are appropriate for non-circuit-related traffic. This paper discusses two of the tools currently used by BT. The Signalling Network Performance Model is used to assess various performance parameters within the signalling network, for a range of network topologies. The Network Configuration Tool spreads the signalling load from ... View full abstract»

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  • A novel automatic call restriction scheme for control of focused overloads

    Publication Year: 1994, Page(s):27/1 - 2710
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (504 KB)

    The contol scheme described has been designed so that it is automatic in two senses. The called party number identifying the resource in overload is automatically identified. The level of call restriction performed at nodes remote from the resource is updated dynamically in such a way that the ineffective calling rate at the resource is kept within an acceptable limit whilst the occupancy of the r... View full abstract»

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  • A simulation tool for evaluating DQDB networks

    Publication Year: 1994, Page(s):28/1 - 2811
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (576 KB)

    A Metropolitan Area Network based upon the IEEE 802.6 Medium Access Control protocol has been installed in Dublin. This paper describes an evaluation of the DQDB protocol derived from a state description and uses the commercially available simulation tool OPNET View full abstract»

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  • Multicast algorithms evaluation using an adaptative routing in ATM networks

    Publication Year: 1994, Page(s):7/1 - 7/6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (332 KB)

    This paper proposes a multicast implementation based on adaptive routing with anticipated calculation. Three different cost measures for a point-to-multipoint connection: bandwidth cost, connection establishment cost and switching cost can be considered. The application of the method based on pre-evaluated routing tables makes possible the reduction of bandwidth cost and connection establishment c... View full abstract»

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  • Simultaneity in discrete-time queues with compound Bernoulli inputs and AF-DF buffer management policies

    Publication Year: 1994, Page(s):29/1 - 2915
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (620 KB)

    This paper focuses on discrete-time single server queues with finite capacity and Compound Bernoulli Inputs with geometrically distributed bulk sizes under Arrivals First (AF) and Departures First (DF) buffer management simultaneity policies. The influence of these policies on typical performance measures is investigated and closed-form expressions relating to various state probabilities are based... View full abstract»

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  • Network level support for QOS commitment

    Publication Year: 1994, Page(s):11A/1 - 11A10
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (700 KB)

    Distributed multimedia applications such as those supported by emerging multimedia workstations will generate communications traffic with a wide range of service requirements. This paper addresses the problems of supporting QoS in the network region, focusing on the provision of services to continuous media traffic. The main objective is to determine what resources must be allocated throughout the... View full abstract»

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  • Permit delivery rates of an ATM cell based access network MAC protocol

    Publication Year: 1994, Page(s):8A/1 - 8A/9
    Cited by:  Papers (1)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (440 KB)

    RACE 2024, Broadband Access Facilities (BAF) project has developed a Medium Access Control (MAC) Protocol that explicitly manages the transmission of each individual ATM cell. This mechanism polls each Network Termination (NT) and depending on the NT's queue length issues permits to send. Multiplexing several variable bit rate sources together causes cell clumping when issuing permits at the sum o... View full abstract»

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  • Large deviations for arrivals, departures, and overflow in some queues of interacting traffic

    Publication Year: 1994, Page(s):30/1 - 30/8
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (300 KB)

    The theoretical relationship between the entropy of a source and the overflow probabilities in a single server queue is well understood in a great deal of generality. This paper applies such a `calculus of entropy' to classes of queueing problems involving traffic of different priorities. The main new ingredient is that traffic with a lower service priority experiences a varying service rate: it t... View full abstract»

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  • Fuzzy logic based techniques for connection admission control in ATM networks

    Publication Year: 1994, Page(s):12A/1 - 12A/8
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (372 KB)

    This paper describes an approach for CAC that uses fuzzy logic techniques and a method for learning the behaviour of the traffic in an ATM link. The learning process is performed by collecting, at specific times, examples of information on the current traffic pattern in the system. Using fuzzy reasoning, the system will then infer, from the knowledge extracted from the examples, a value for the ba... View full abstract»

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  • Hierarchical approach to video source modelling

    Publication Year: 1994, Page(s):19/1 - 1910
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (596 KB)

    The authors consider models of compressed video sources with different scene types changing suddenly and producing a multiple activity output bit rate. The long-term autocorrelation effects are topics of interest in variable bit rate traffic. Moreover, video sources show different short-term and long-term (sample) autocorrelation behaviour. New classes of models are described which can explain the... View full abstract»

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  • Implementing a space priority mechanism in a cell-rate ATM network simulator

    Publication Year: 1994, Page(s):13B/1 - 13B/7
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (368 KB)

    Asynchronous Transfer Mode (ATM) provides the means of transporting information from traffic sources with different characteristics (such as tolerances to cell loss, delay and burstiness) through a broadband network. In order to optimise the network utilisation, while meeting the requirements of each type of traffic source, it is possible to use space priority mechanisms. This paper describes one ... View full abstract»

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  • A real time management system for the Two-Level CAC algorithm

    Publication Year: 1994, Page(s):9A/1 - 9A/5
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (272 KB)

    RACE 2059, Integrated Communications Management (ICM) project is investigating ways in which a Connection Admission Control (CAC) function can be manipulated by the Telecommunications Management Network (TMN) in order to achieve optimal network performance. The Two-level CAC Algorithm is a compromise between the speed and accuracy required. This paper reviews the Two-Level approach and looks at wa... View full abstract»

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  • Simulated allocation: a suboptimal solution to the multicommodity flow problem

    Publication Year: 1994, Page(s):31/1 - 31/7
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (328 KB)

    The paper discusses a stochastic approach to multicommodity flow problems, whose idea comes from simulation of alternative call routing in circuit-switched networks. The proposed method can be used to find suboptimal solutions for a vast class of integer-valued multicommodity flow problems. The preliminary results illustrate the effectiveness of the method in application to reconfiguration of mesh... View full abstract»

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  • Performance of multiple access protocols for data communication in PMR systems

    Publication Year: 1994, Page(s):10B/1 - 10B13
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (704 KB)

    One of the main areas of interest in these systems is the optimisation of the use of the return link between mobiles and their base station. Users expect to receive a good response; operators aim to pack the highest possible number of users on a single channel to maximise utilisation and make efficient use of spectrum. This paper describes results from a simulation model that encapsulates the gene... View full abstract»

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  • Dimensioning playout buffers from an ATM network

    Publication Year: 1994, Page(s):16A/1 - 16A/9
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (324 KB)

    The authors investigate how earlier work of van den Berg and Resing and of D'Ambrosio and Melen (1993) can be combined with classical bounds for the GI/G/1 queue to give insight into the output buffer required for a smooth playout of cells. The effect of both the number of stages across the network and the rate of the stream is considered. A possibly surprising conclusion is that as the rate of th... View full abstract»

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  • A multilink ATM switch capable of supporting two priority classes

    Publication Year: 1994, Page(s):13A/1 - 13A/6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (288 KB)

    The switch employs a pre-emptive priority mechanism in which delay sensitive traffic (class 1) can preempt delay insensitive traffic (class 2) in input buffers when competing for the same output port. The architecture uses a simplified Batcher Banyan Switch (SBBS) fabric which requires a simple hardware structure, running a 4-phase algorithm on a slot-by-slot basis. Performance studies have shown ... View full abstract»

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  • The transmission of compressed video over ATM networks

    Publication Year: 1994, Page(s):20/1 - 20/6
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (312 KB)

    Using simulation modelling techniques, the influence of cell loss and jitter on image quality is investigated and the optimum bandwidth requirements for a number of multiplexed video sources are quantified to achieve an acceptable quality of service for each video connection View full abstract»

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  • Application of ATM network simulation to TMN studies

    Publication Year: 1994, Page(s):14B/1 - 14B12
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (540 KB)

    RACE project R2059 ICM is developing a cell rate ATM network simulator for aiding the development of a generic Telecommunications Management Network (TMN) testbed. This simulator provides a means to test the TMN system in a controlled environment before interfacing with a physical network. It provides network scaling, which is not possible on existing ATM networks, and also allows the control of m... View full abstract»

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  • IEE Eleventh UK Teletraffic Symposium. Performance Engineering in Telecommunication Networks

    Publication Year: 1994
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (16 KB)

    The following topics were dealt with: telecommunication network analysis; ATM routing, call acceptance, and cell delay variation; satellite and radio networks; simulation; video; and modelling View full abstract»

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  • Performance modelling of a bridged router wide area network

    Publication Year: 1994, Page(s):23/1 - 23/9
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (320 KB)

    This paper describes the design and implementation of a bridged router wide area network simulator to model the Northumbrian Water communications network. Some examples of typical simulation experiments are provided and conclusions made for future capacity planning and possible implementation of dynamic routing strategies under failure conditions View full abstract»

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  • Multi-rate call congestion: fixed point models and trunk reservation

    Publication Year: 1994, Page(s):6/1 - 610
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (592 KB)

    This document gives a brief survey of the state-of-the-art techniques in calculating the call congestion in a heterogenous traffic environment on a single link when Trunk Reservation (TR) is used to equalise the blockings. By means of exact and approximate techniques, it is shown that the blockings are sensitive to changes in mean holding time ratio. TR may not be a robust method when heterogeneou... View full abstract»

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  • Sharing user-network interfaces between networked multimedia applications

    Publication Year: 1994, Page(s):10A/1 - 10A/8
    Cited by:  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (428 KB)

    The effective use between these applications of the limited bandwidth at the User-Network Interface (UNI) has raised increasing interest from both end-system and telecommunication networks researchers. This paper addresses the structure of higher layer traffic controls at the end-systems. A session scheduling priority scheme is proposed which reflects the user specified service priority and the im... View full abstract»

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  • Video source modelling for ATM networks

    Publication Year: 1994, Page(s):18/1 - 18/9
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (408 KB)

    The one layer codec presented is based on a discrete time Markov chain. The two layer model is modelled by its individual layers. Both are derived from an analysis of video conference data. The models are simulated using a commercial discrete event simulation tool. Evaluations of the characteristics of each source are presented, as are the capabilities and limitations of the models View full abstract»

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  • Finite source modelling of private mobile radio systems

    Publication Year: 1994, Page(s):12B/1 - 12B/7
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (348 KB)

    The relationship between spectrum efficiency and coverage cell size is investigated, and also the application of a finite source traffic model to determine whether a worthwhile increase in spectrum efficiency is obtainable when systems are planned by preventing over-dimensioning View full abstract»

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