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Broadband traffic characteristics.- Broadband service models.- Accounting for cell delay variation.- Statistical resource sharing.- Connection admission control.- Weighted fair queueing.- Access network design.- MAC protocols for access... more
Broadband traffic characteristics.- Broadband service models.- Accounting for cell delay variation.- Statistical resource sharing.- Connection admission control.- Weighted fair queueing.- Access network design.- MAC protocols for access to B-ISDN.- Generic architecture and core network design.- Multiservice network dimensioning.- Virtual path network design.- Resource management and routing.- Traffic modelling.- General tools for queueing analysis.- Cell scale queueing.- Burst scale loss systems.- Burst scale delay systems.- Multi-rate models.
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This coherently structured and authorative text is the final report of the European Action COST 242, devoted to advancing research in the field of multiservice network design and performance evaluation. The excellent results presented are... more
This coherently structured and authorative text is the final report of the European Action COST 242, devoted to advancing research in the field of multiservice network design and performance evaluation. The excellent results presented are largely based on some 240 ...
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The mathematical formulation used to determine the minimum cost network that can bypass the blocked branch in the case of failure of only one transmitting element each time is described. A limited cost spare network was specified, for... more
The mathematical formulation used to determine the minimum cost network that can bypass the blocked branch in the case of failure of only one transmitting element each time is described. A limited cost spare network was specified, for which the network availability is maximum. It is shown in two examples that by limiting the cost of the spare network to 20% it is possible to solve service interruption in 48% and 62% of the cases, respectively.
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The problem of minimizing costs for networks with routing path and diversification boundaries, and that of maximizing the number of alternate routing paths for a given cost and network geometry are studied. The mathematical model is... more
The problem of minimizing costs for networks with routing path and diversification boundaries, and that of maximizing the number of alternate routing paths for a given cost and network geometry are studied. The mathematical model is limited to networks which can be described by multigraphs and where network costs are a function of the individual branch cost only. The model is also limited to paths using the same number of circuits. Two heuristic procedures and solution algorithms are discussed. An existing computer program (OSRI) is modified for application of the proposed methods. Examples are included.
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Telecommunication networks, are optimised so to reduce the impact of fixed costs and to take advantage of system economy of scale. Satisfactory protection target expressed in terms of availability, survivability and soft failing... more
Telecommunication networks, are optimised so to reduce the impact of fixed costs and to take advantage of system economy of scale. Satisfactory protection target expressed in terms of availability, survivability and soft failing performances should be guaranteed by the designer. In ring networks with self-healing capability such figures are related to the topological features of the network. To rationalise the comparison of different design alternatives and to drive automatic tools balancing all the conflicting criteria involved in the evaluation, the design problem can be formulated as an MCDM process. In the paper, an interactive MCDM procedure based on dynamic aspiration levels and achievement scalarising functions, is proposed to solve the multiple ring network design problem where both cost and protection are taken as simultaneous objectives.
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In this paper the economic viability of alternative architectures for optical access networks providing broad band services to different subscriber classes in a metropolitan environment, is investigated by a specific tool, NEVE (Network... more
In this paper the economic viability of alternative architectures for optical access networks providing broad band services to different subscriber classes in a metropolitan environment, is investigated by a specific tool, NEVE (Network Economic Viability Evaluator), developed for broad band multiservice network planning, service evolutionary scenarios assessment, evaluation of tariff strategies and other actions taken at stimulating the demand growth. As the viability target can be achieved in different ways, different studies can be carried out by NEVE. In the paper some of them are discussed, particularly the ones addressed: to evaluate the impact on viability of alternative service scenarios; to determine the critical mass of broad band subscribers and the critical joint service adoption cost; to evaluate cross subsidiary policies among different subscriber classes and services; to perform sensitivity analysis with respect to variations of demand parameters and tariffs.
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Research Interests: Computer Science and Comm
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The authors describe the work undertaken in RAC Project 1044-IBC Development and Implementation Strategies, in the Evolution Prospects and Framework (EPF) workpackage. The role of EPF within the RACE project is to assess common and... more
The authors describe the work undertaken in RAC Project 1044-IBC Development and Implementation Strategies, in the Evolution Prospects and Framework (EPF) workpackage. The role of EPF within the RACE project is to assess common and country specific evolution paths to the deployment of an European Integrated Broadband Communication Network. Since January 1989 this has been addressed through the selection of several case studies. They describe a part of the work carried out in case study six and deal with the design and planning of an urban interoffice network in a B-ISDN environment. >
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This paper analyses a tree hierarchical network architecture employing pooled cache memories and multicasting network capability to deliver Interactive Video on Demand (I-VoD) services. The cache memories are located close to the customer... more
This paper analyses a tree hierarchical network architecture employing pooled cache memories and multicasting network capability to deliver Interactive Video on Demand (I-VoD) services. The cache memories are located close to the customer and are able to store segments of the most popular programs in a dynamic way. They can reduce both transmission bandwidth and storage capacity required in the
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The paper deals with the optimal location of video servers in hierarchical networks delivering interactive video on demand (I-VOD) services. This is in general a dynamic problem, whose solution is sensitive to the uncertainty of the... more
The paper deals with the optimal location of video servers in hierarchical networks delivering interactive video on demand (I-VOD) services. This is in general a dynamic problem, whose solution is sensitive to the uncertainty of the demand evolution. As a global approach would be too complex and also impractical, it is more suitable to identify the significant simplified problems, in which only a subset of the input data and of the decision variables is considered. In particular, several kinds of problem formulation, implying both static and dynamic, deterministic and uncertain demand models, are discussed; numerical analysis is performed to assess their applicability.
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The authors describe the work undertaken in RAC Project 1044-IBC Development and Implementation Strategies, in the Evolution Prospects and Framework (EPF) workpackage. The role of EPF within the RACE project is to assess common and... more
The authors describe the work undertaken in RAC Project 1044-IBC Development and Implementation Strategies, in the Evolution Prospects and Framework (EPF) workpackage. The role of EPF within the RACE project is to assess common and country specific evolution paths to the deployment of an European Integrated Broadband Communication Network. Since January 1989 this has been addressed through the selection of several case studies. They describe a part of the work carried out in case study six and deal with the design and planning of an urban interoffice network in a B-ISDN environment. >
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The relationship between service availability and network availability are considered with respect to two types of end to end reference connections usable for international networks. Numerical computations were made by a weighted... more
The relationship between service availability and network availability are considered with respect to two types of end to end reference connections usable for international networks. Numerical computations were made by a weighted availability index to verify the acceptability of availability targets specified for particular transmission media. The evaluations show that the service interruptions are one order of magnitude smaller then the objectives recommended for radio links.
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Economic comparison of configurations using different types of fibers, cables, laying conditions and transmission systems to be used for long distance optical communication is summarized. Multimode graded-index fibers with a bandwidth of... more
Economic comparison of configurations using different types of fibers, cables, laying conditions and transmission systems to be used for long distance optical communication is summarized. Multimode graded-index fibers with a bandwidth of 800 MHz (at 1300 mm) give more economical plants than fibers with 1000 MHz/Km. With fast increase of services the laying of cables in ducts is more convenient
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Consiglio Nazionale delle Ricerche (CNR). Biblioteca Centrale / CNR - Consiglio Nazionale delle RichercheSIGLEITItal
Consiglio Nazionale delle Ricerche (CNR). Biblioteca Centrale / CNR - Consiglio Nazionale delle RichercheSIGLEITItal
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Research Interests: Computer Science and Comm
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Telecommunication networks, are optimised so to reduce the impact of fixed costs and to take advantage of system economy of scale. Satisfactory protection target expressed in terms of availability, survivability and soft failing... more
Telecommunication networks, are optimised so to reduce the impact of fixed costs and to take advantage of system economy of scale. Satisfactory protection target expressed in terms of availability, survivability and soft failing performances should be guaranteed by the designer. In ring networks with self-healing capability such figures are related to the topological features of the network. To rationalise the comparison of different design alternatives and to drive automatic tools balancing all the conflicting criteria involved in the evaluation, the design problem can be formulated as an MCDM process. In the paper, an interactive MCDM procedure based on dynamic aspiration levels and achievement scalarising functions, is proposed to solve the multiple ring network design problem where both cost and protection are taken as simultaneous objectives.
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ABSTRACT
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This paper analyses a tree hierarchical network architecture employing pooled cache memories and multicasting network capability to deliver Interactive Video on Demand (I-VoD) services. The cache memories are located close to the customer... more
This paper analyses a tree hierarchical network architecture employing pooled cache memories and multicasting network capability to deliver Interactive Video on Demand (I-VoD) services. The cache memories are located close to the customer and are able to store segments of the most popular programs in a dynamic way. They can reduce both transmission bandwidth and storage capacity required in the
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The paper deals with the optimal location of video servers in hierarchical networks delivering interactive video on demand (I-VOD) services. This is in general a dynamic problem, whose solution is sensitive to the uncertainty of the... more
The paper deals with the optimal location of video servers in hierarchical networks delivering interactive video on demand (I-VOD) services. This is in general a dynamic problem, whose solution is sensitive to the uncertainty of the demand evolution. As a global approach would be too complex and also impractical, it is more suitable to identify the significant simplified problems, in which only a subset of the input data and of the decision variables is considered. In particular, several kinds of problem formulation, implying both static and dynamic, deterministic and uncertain demand models, are discussed; numerical analysis is performed to assess their applicability.