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Composite Broadband Interworking and End-to-End Models

Ziel

COMBlNE investigates the interworking of ATM-based broadband networks with other networks foreseen to be present in future scenarios. Therefore COMBlNE's primary objective is to create a conceptual and technological foundation to enable separated broadband islands to work together in providing broadband services, including connectionless data service.

In particular COMBINE will specify interworking strategies with respect to quality of service, level of interworking, routing, addressing, resource allocation and management. The interworking strategy will be validated through design, development and demonstration of heterogeneous networks, functioning on a selected testbed.
The objective of the research was to investigate the interworking of asynchronous transfer node (ATM) based broadband networks with other networks foreseen in future scenarios. Therefore the primary objective was to create a conceptual and technological foundation to enable separated broadband islands to work together in providing broadband services, including a connectionless data service.

In particular it was necessary to specify interworking strategies with respect to quality of service, level of interworking, routing, addressing, resource allocation and management. The interworking strategy is validated through design, development and demonstration of heterogeneous networks, functioning on a selected testbed.

The research has resulted in the following:
the modelling of the different network elements has been completed;
the first analysis of the ATM DQDB interworking unit (IWU) functions has resulted in a draft IWU specification based on a defined reference configuration;
different protocol mappings have been investigated;
hardware and software reference configurations have been developed;
network environments including ATM, distributed queue dual bus (DQDB) metropolitan area network (MAN), local area networks (LAN) such as Ethernet, fibre distributed data interface (FDDI) and Token Ring, and Frame Relay have been analyzed.

A simulation tool has been developed to help the network designer to identity the optimum network design parameters for a heterogenous network environment. The tool consists of 2 parts: simulation modules and a user interface. The simulation modules are created using enhancements of an asynchronous, event driven C-function library to enable the simulation of heterogeneous scenarios. The user interface helps the user to create the design of the network to be simulated. The interface has been generated using an object oriented C++ function library. By this modular concept of simulation modules and user interface the optimum network can be found without much knowledge of the underlying simulation details.

A high performance interworking unit (IWU) has been designed and implemented for up to 155 Mbps between asynchronous transmission (ATM) and distributed queue dual bus (DQDB) which supports the direct provision of connectionless service as well as indirect provision and isochronous service. THE IWU processes all user plane cells or slots in such a way that incoming cells are converted into outgoing slots (and vice versa) in a cell by cell manner (on the fly). Segmentation and reassembling of datagrams is not necessary. This leads to a very low delay of some 20 us and high throughput of 365000 messages per second.

An asynchronous transmission (ATM) distributed queue dual bus (DQDB) interworking unit, has been designed and implemented. The global management consists of the configuration, performance and fault management of the interworking unit (IWU). A graphical human machine interface to allow a friendly interaction with the IWU operator has also been implemented. The communication aspects between the global management and the human machine interface as well as the communication between the global management and the layer management have been examined.
Technical Approach

Based on identified interworking requirements, existing and future protocols, important features are extracted in order to show the generic nature of Inter-Working Units (IWUs). Translation of protocol stacks is considered. Different IWU parameter sets are analysed.

Protocols and networks have been modelled and a mathematical and stochastic analysis of the models is developed for performance analysis and IWU optimisation.

An IWU with a Connectionless Broadband Data Server (CBDS) interface is specified. The IWU is designed and integrated in a testbed with connection to a CBDS server. Traffic experiments will be set up during January-April 1995 to validate the proposed interworking strategies.

Key Issues

The project addresses the key functional requirements in establishing high performance interworking in heterogeneous broadband networks. Both conceptual and implementation aspects of interworking are considered.

Expected Impact

This project should indicate how optimal interworking between broadband networks can be realised.

The availability of the IWU component could trigger integration of different broadband networks, especially in providing high-speed connectionless services over large geographical areas (e.g. ATM to LAN/MAN interconnect).

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KJOEBENHAVNS TELEFON AKTIESELSKAB
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NOERREGADE 21
1199 COPENHAGEN
Dänemark

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Letzte Aktualisierung: 24 Juni 1994

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Permalink: https://cordis.europa.eu/project/id/R2032/de

European Union, 2024