SP7: Technical and Mobile Infrastructure

From the basic goal to enable intelligent, multimodal access to the Semantic Web in different mobile contexts and with various devices follows a complexly structured overall system. An important part aspect of the hereby necessary technical and mobile infrastructures is the development and provision of adequate software architecture that, in a flexible way, allows, at least in a limited way, both to make the desired application functionality locally accessible on the resource-limited device and to provide additional high-capacity computation components via the network. Furthermore, the approach to the architecture has to be constructed as broadly as possible in order to have the possibility to broaden the spectrum to an ad-hoc network and to provide information on the basis of m:n communication.

Within the framework of this Work Package solutions will be worked out that will allow the integration of flexibly configurable devices and server components and will thereby especially enable an open and scalable architecture for the overall system.

For the development and the conducting of tests, the developers have to be provided with access to content services (especially to those concerning the 2006 FIFA World Cup).

Deutsche Telekom provides the test environment for access via UMTS (as an isolated application) for several informational services.

The challenge for future mobile services lies in the integration of all the diverse technologies, actors, and end users. The simultaneous, multimodal use of heterogeneous network technologies within the personal environment of the user can greatly reduce the effort when using these technologies and thereby also heighten the user satisfaction. The surplus value of mobile informational services in the area of "Body Area Network" decidedly contributes to a sustained acceptance of modern informational services. New multimodal applications for the mobile environment allow the user to feel that he is "always connected in the best way".

The roaming between different mobile broadband nets, the so-called vertical handover, is at the moment the biggest technical challenge. The various network technologies with their different transmission rates, scopes and other characteristics are not always used to their optimum. That way, roaming, e.g., in the area of mobile communication, sometimes only takes place within one system, in other words horizontally.

Depending on the area of application and the spectrum of services, it is desirable to choose specifically between the at a time available nets based on location and time in order to be able to provide an optimal quality of service. Depending on the requirements of the applications or considerations regarding the costs, a change between connection-oriented and broadcast-based network technologies can take place. To support the mobility of the user, a dynamic roaming between different technologies is necessary.

In order to reach a huge number of users, i.e., in a high density area, simultaneously and cost effectively, broadcast services are admittedly the most cost effective, up-to-date and efficient technologies. The backchannel that is missing in this technology can, when necessary, be provided via another medium, e.g., via a W-LAN-hotspot.

The mobile broadband access to the network while utilizing different characteristics of locally and temporally available technologies, especially broadband based technologies, allow for an optimal adaptation of the applications in their respective contexts. Ideally, all changes in net and service performed by the applications should be invisible to the user. The roaming from connection-oriented to broadband-oriented nets calls for adaptive and particularly anticipatory information retrieval and distribution in order to provide the user with the qualitatively highest service quality in each case depending on the context. A shift of semantic extraction functionality into the net infrastructure or into the processing of data from broadcasting systems has therefore to be aspired.


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