Bernd X. Weis

Impact of error-detecting/error-correcting codes on reliable data transmission over noisy channels in ATM systems

The statistics of cell loss and misrouting due to transmission errors in asynchronous transfer mode (ATM) or cell-based systems, which result in unreliable data transmission and thus in a degradation of service quality, are developed. Results indicate that it is essential to use a decoding scheme for the virtual channel identifiers of a cell in order to satisfy the expectation of the subscriber with respect to transmission reliability and data security. The models of connections, exchanges, and transmission in the cell-based systems are presented. >

Mobility management platform and transaction management in third generation mobile communication networks

Third generation mobile telecommunication systems need enhanced capabilities to manage new (mobile) services and the increased mobility of the user. Therefore, the authors propose two concepts for the signalling system. The mobility management platform, the concept of which is described in the paper, will provide uniform access to mobility functions for every user or network entity independent of the actual location of the requested functionality in the network. The mobility management platform is based on the IN concept. Transaction management is introduced to enable the signalling network to distribute load amongst several nodes. Homogeneous load n the network results in optimized usage of network nodes.

Secure Communication for Train Control

In this paper we will elaborate on specific aspects of security as related to safety in an environment where safety is the major concern — train control systems.

Concept of a local integrated operation network for different information flows

The network, called ALADIN, is a modular network for industrial, domestic, and automotive applications which integrates isochronous and asynchronous services ranging from a few kb/s to several Mb/s. ALADIN is based on a star structure with a passive optical star coupler. The ALADIN control is decentralized for safety reasons. A master station which is dynamically determined at start-up, generates synchronous frames and the other stations include their data into these frames by superposition in the star coupler. The paper describes the concept and the building principles of the network, the protocols, and the routines for synchronization.

An On-Line Environment for Future Broadband Telecommunication Systems

This paper describes an on-line environment for future telecommunication systems. The architecture as weil as the design of and the results from the prototype summarizes some aspects of the activities in the IBC On-Line Environment (IOLE) project within the RACE program launched by the EC in 1988. The on-line environment targets for the integrated broadband communications network - a network based on the asynchronous transfer mode and supporting a whole variety of services from low to very high bit rates. The on-line environment provides a sound basis for the whole spectrum of application software performing e.g. basic call handling, maintenance functions or providing value added services. It is distributed and features (i) a general on-line interface, (ii) fault tolerance mechanisms, (iii) tools for on-line software re placement and extension, (i v) tools f or on-line software testing, (v) a knowledge based man-machine interface.