SFB 627: Nexus
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SFB 627: Nexus
Project B5:

Dynamic, Time-Referenced Model Data

Deutsche Version
Prof. Dr.-Ing. habil. Bernhard Mitschang

University of Stuttgart
Institute of Parallel and Distributed Systems
Universitätsstraße 38
70569 Stuttgart

Tel. +49 (0)711 7816 449
Fax +49 (0)711 7816 424

Prof. Dr. rer. nat. Dr. h. c. Kurt Rothermel

Universität Stuttgart
Institute of Parallel and Distributed Systems
Universitätsstraße 38
70569 Stuttgart

Tel. +49 (0)711 7816 434
Fax +49 (0)711 7816 424


This project develops basic concepts to allow for the high dynamics of federated spatial world models. We aim at the preparation and management of dynamic, time-referenced data as well as the efficient access to such data.

Data History Server and History Warehouse

Data streams like positions of mobile objects or measurements of sensors are important dynamic context information. Our goal is to develop a data history server which persistently stores data histories from data streams and serves as specialized information provider for time-referenced world models. To reduce the data volume, domain-specific pre-processing algorithms have to be designed. A so-called history warehouse extracts data of the world model and provides specialized operators to analyze spatial data histories. In a further step, we want to investigate, if and how such a history warehouse can be virtualized scalably with the methods developed in Project B1 (graph of operators).

Context Broker

The Context Broker shall enable efficient retrieval of context information in a global federated system. That is to determine a set of context providers which are required to process a certain query on context information. This set has to contain all relevant context providers and as few irrelevant providers as possible. For this purpose we develop approaches for scalable indexing in an open, widely distributed system. Very important criteria for indexing are space and the type of context information. However, due to the complexity of spatial world models the Context Broker further has to incorporate temporal and dynamic criteria.

Efficient Access to Dynamic Context Information on Mobile Devices

Mobile devices are able to acquire dynamic context information using built-in sensors. Furthermore they can provide this information as part of the global federated world model. However, mobile devices are very restricted concerning energy supply, processing power and communication capabilities. Hence, the transmission of such dynamic context information has to be optimized concerning information quality and communication costs. Therefore we develop flexible communication protocols which dynamically minimize the communication costs depending on the type of context information, the required information quality and the underlying communication system.


- Institute of Parallel and Distributed Systems    
  Applications of Parallel and Distributed Systems    
  Distributed Systems Department    


- Project Head    
 - Prof. Dr.-Ing. habil. Bernhard Mitschang   
 - Prof. Dr. rer. nat. Dr. h. c. Kurt Rothermel   
- Research Assistants    
 - Dipl.-Inf. Tobias Farrell   
 - Dipl.-Inf. Nicola Hönle   
 - Dipl.-Inf. Ralph Lange