Many of the interesting problems in Computer Science related to softwareengineering have yielded only to partial solutions or not at all. In the related areas of research denoted Communications softwareengineering a...
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Several synthesis methods have been proposed and applied to the design of computer communication protocols. Most of these methods do not use the service specification as a reference (or starting) point in the protocol...
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The authors introduce a novel method for the synthesis of protocol entity specifications starting from the service specification. Both protocol and service specifications are modeled by deterministic finite state mach...
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The authors introduce a novel method for the synthesis of protocol entity specifications starting from the service specification. Both protocol and service specifications are modeled by deterministic finite state machines. The interactions between the protocol entities and the service users are tightly or strongly synchronized. However the interactions among the protocol entities are based on the sending and the eventual reception of protocol messages via the underlying FIFO (first-in first-out) communication medium. The derived protocol specifications are proven to be semantically correct, meaning that the interacting protocol entities provide the specified service, and syntactically correct, meaning that no design errors, such as deadlocks or unspecified receptions, can occur during the interaction among the derived protocol entities. The application of the new method to the association control service is also presented.< >
作者:
OUIBRAHIM, HPATTENIER, FJAT&T NS NL
Postbus 18 1270 AA Huizen The Netherlands Hamza Ouibrahim:obtained his B.Sc
M.Sc and Ph.D in 1981 1982 and 1986 respectively all in Electrical Engineering from Syracuse University Syracuse New York. In 1986 he joined the Electrical Engineering Department at the Watson School of Engineering at the State University of New York at Binghamton as Assistant Professor. Since 1988 he has been with the Forward Looking Work Department of AT&T-NSNL in the Netherlands where he is project manager responsible for a group of research engineers working on signalling for BISDN networks. He represents AT&T-NSNL in standards bodies such as ITU-TSS and ETSI. He has been involved in European Research projects (Research and development in Advanced Communications in Europe) developing a signalling system for the integrated broadband communications. His current interests include ATM and signalling for broadband networks. He is the author of numerous papers and an IEEE member. Frans Pattenier:finished his study in Electronic Engineering in 1987 in the Netherlands. In 1983 he joined the Dutch Police Communication Service and in 1988 the National Institute for Public Health and Environment Protection. He joined the Forward Looking Work Department of AT&T-NSNL in 1991. In the first five of his career he was involved in hardware development for analogue
digital and microprocessor systems for dataacquisition and communication equipment. Later software-development became more important for him (using Pascal C and C+ +) and he is now involved in projects which include aspects such as signalling protocols and call processing. He thinks the real challenge is to complete a project using object-oriented and structured techniques for every phase on every level.
The control system of a BISDN network will undoubtedly be very complex to design, implement and maintain. Its complexity has led researchers to look for ways of breaking down the problem into smaller and manageable pa...
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The control system of a BISDN network will undoubtedly be very complex to design, implement and maintain. Its complexity has led researchers to look for ways of breaking down the problem into smaller and manageable parts. This has motivated the use of an object-oriented approach to analyse and comprehend the BISDN control system. This paper thus presents an object-oriented analysis (OOA) of a BISDN control system. This analysis is based on a method introduced by Coad and Yourdon and comprises five steps. All five steps, namely identifying subjects, identifying objects, identifying structures, defining attributes, and defining operations, will be worked out in detail with an emphasis on the user network interface (UNI) signalling protocol object. Four subjects, nine objects, and three structures are identified in the problem space at hand. This structuring offers a framework to analyse in detail the three aspects, data, structure and dynamic behaviour, of the UNI signalling protocol. A parallel between this approach and the well known approach used by the International Telecommunication Union (ITU) for specifying signalling protocols and contained in Recommendation I.130 is drawn. The Coad and Yourdon OOA approach applied to a BISDN control system can be used for the analysis of different aspects of such systems. This paper focuses on the UNI signalling protocol object which leads to a complete specification. Any protocol resulting from such analysis can be claimed to be object-oriented protocol. This approach offers modularity and thus offers a way of structuring the problem space into identifiable objects and data. Full benefits of object orientation can be gained only in the consistent use of object orientation throughout all steps in the development process. The proposed approach allows one to create libraries of generic procedures which can be reused in specific implementations.
Key issues regarding the operation of the broadband integrated services digital network (BISDN) via satellite are presented herein. The specific issues, challenges, and their resolutions are detailed. In particular, t...
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Key issues regarding the operation of the broadband integrated services digital network (BISDN) via satellite are presented herein. The specific issues, challenges, and their resolutions are detailed. In particular, the impact of error characteristics and propagation delay on the operation of BISDN via satellite is discussed. Solutions are presented for removing adverse effects and providing high-quality service to users of BISDN via satellite.
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