Carmelita Görg

Advanced service provisioning based on mobile agents

Service provisioning is currently a challenging issue to offer future telecommunication services efficiently and at the same time in a flexible and user-friendly manner. As a contribution of the ACTS CAMELEON [CAMELEON project: http://www.comnets.rwth-aachen.de/~cameleon and CLIMATE ACTS cluster for intelligent mobile agents in telecommunication environments: http://www.fokus.gmd.de/cc/ima/climate/] project to the VHE (Virtual Home Environment) concept of UMTS (Universal Mobile Telecommunication System) [ETS ITS 22.70 Universal Mobile Telecommunication System (UMTS), service aspects: Virtual Home Environment (VHE). UMTS Draft Version, 3.00, 1998], this paper describes an advanced approach for service execution and service provisioning based on agent technology. The mobile and autonomous agent paradigm is a promising new approach for flexible service provisioning as well as automatic feature updates in terminals and network nodes. This paper describes an Adaptive Profile Manager, which is an agent-based mechanism that allows a telecommunication user access to his personalised services independent of the used end device (mobile phone, Laptop, PDA, among other devices). The service presentation is adapted to the corresponding end device considering its capacity and system features as well as the specific user profile.

The RESTART/LRE method for rare event simulation

Using the LRE-algorithm (LRE: Limited Relative Error) for the evaluation of simulated data yields the sta tionary distribution function of an investigated random sequence and additionally the so-called local correlation coefficient, which represents relevant correlation evidence to be included in the error measure for controlling the simulation run time. In this paper a simplified LRE-algorithm is used to evaluate discrete sequences like the occupancy of finite buffer queueing systems G/G/1/N. It is shown how this algorithm is combined with the RESTART-method for an efficient rare event simulation. A multi-stage RESTART/LRE-algorithm has been implemented as part of a stochastic simulation system and its performance has been verified by extensive simulations of the reference system M/M/1/N, whose properties including the local correlation coefficient can be described by analytical formulas. Approximate formulas for the optimal number of stages and number of trials are given. The new algorithm has been successfully applied to several finite buffer queueing systems, including the SSMP(2)/D/1/N system with a correlated input stream, in order to gain by simulation the distribution function of the occupancy including very low loss probabilities in the order of 10/sup -9/ and even 10/sup -21/, which are relevant for the performance of switching nodes in the ATM broadband network.

Agent technology for the UMTS VHE concept

This paper addresses how the new promising paradigm of Agent Technology can be applied to the provisioning of service ubiquity based on the concepts of the Virtual Home Environment (VHE) being developed for the third generation mobile communication system UMTS. To illustrate the possibilities two sophisticated agentbased telecommunication services, namely the Adaptive Profile Manager and the Virtual Address Book, are described in

A Mobile Agent-Based Approach for the UMTS/VHE Concept

The provision and delivery of personalised services across network and terminal boundaries with the same look and feel is currently a challenging issue for service provisioning in future telecommunication networks like UMTS (Universal Mobile Telecommunication System). This paper describes an advanced mobile agent-based approach for realisation of the VHE (Virtual Home Environment) concept considering two main aspects namely service roaming and terminal independence. The first one implicates the accessibility of personalised services in any network the user roams to, while the latter deals with the adaptation of the service presentation to the corresponding end device (mobile phone, Laptop, PDA,...) according to its capacity and system features as well as the specific user profile. The implementation of some service prototypes are described which were developed in the framework of the ACTS CAMELEON project [11,12].

Personal Communication System Realizations: Performance and Quality of Service Aspects on SS-No.7

The ”Personal Services Communication Space” (PSCS) is a telecommunication service providing personal mobility. The users can initiate and receive calls on the basis of a personal network transparent number across multiple networks, at any terminal, fixed or mobile, irrespective of geographic location. This paper describes a performance study of the RACE project Mobilise for the personalization, mobilization and integration of advanced wide area network communication services. With the expected number of PSCS users, the impact on the signalling network could be dramatic. The paper presents the numbering scenarios for PSCS and the use of a Personal User Identity (PUI). Different distributions of the Intelligent Network entities and the impact on an existing SS-No.7 network and the call setup time have been studied.

Verbundprojekt: Schnelle Netze Nutzung und Entwicklung der Datenübertragung mit Hoch- und Höchstgeschwindigkeit

Der Forschungsverbund Schnelle Netze hat zum Ziel, die fur die Informationsgesellschaft notwendigen technischen Voraussetzungen in Form superschneller und zuverlassiger Datenubertragung zu schaffen Der Forschungsverbund entwickelt neue Technologien, um praxistaugliche Datenubertragungssysteme im Hoch- und Hochstgeschwindigkeitsbereich zu entwerfen und zuverlassig zu betreiben. Das Ubertragungsverfahren der Zukunft ist der Asynchrone Transfer Modus (ATM). ATM erlaubt durch statistisches Multiplexen der Verkehre, in Kombination mit kurzzeitiger Pufferung, eine optimale Ausnutzung der Ubertragungskapazitat heutiger und zukunftiger Netze. ATM wurde fur die Erweiterung des ISDN zum Breitband ISDN (B-ISDN) standardisiert. B-ISDN unterstutzt hochste Ubertragungsraten und ermoglicht die Integration verschiedenster Dienste, fur die bisher spezialisierte Netze zum Einsatz kamen (z.B. Telefon, Telex, Datex-P). Diese Universalitat und die hohe verfugbare Bandbreite machen B-ISDN zu einer idealen Plattform fur Multimedia Anwendungen. Von einer wirklichen Nutzung in der Praxis ist das B-ISDN jedoch noch entfernt. Es fehlen insbesondere genormte Schnittstellen, die den Einsatz von ATM im B-ISDN erlauben, Protokolle, die speziell die an B-ISDN gestellten Anforderungen unterstutzen, sowie die gezielte Optimierung von Flussteuerungsalgorithmen, Speichersystemen und die Integration optischer Ubertragung und elektronischer Vermittlung durch spezialisierte Hardwarekomponenten. Das Verbundprojekt besteht aus zwei Arbeitsgruppen, die im folgenden naher beschrieben werden.