Attività in corso - Unità di Pisa

Università di Pisa (UNIPI)

In modern houses, the presence of sensors and actuators is increasing, while communication services and entertainment systems had long since settled into everyday life. Among the various domotics sensor and actuator networks (DSANs), wireless sensor networks (WSNs) are the version that is growing faster, due to shorter deploying times and simplified configuration. Several technologies and standards are nowadays available for the implementation of a WSNs. Especially the ones based on open or widely adopted standards, such as ZigBee, Bluetooth, Z-Wave, and KNX-RF, can undeniably be regarded as the most interesting ones. Not always, however, do the specifications define a common control plane that is suitable to contemporarily manage devices belonging not only to different standards, but even to different application profiles. As a result, the burden of coordinating and making devices interoperate is often left entirely to the system implementer.

In addition to the need for a coordinating system for the DSANs, in today's houses we already find interpersonal communication and multimedia entertainments systems. Hence, the design of a domotics platform should also consider the integration of communication and multimedia applications with the DSANs-based services.

In this scenario, the research is moving towards to the integration of the various home appliances and devices into a single domotics system, able to exploit the cooperation among the diverse subsystems and offer the end-user a single multi-service platform. The project activities are aimed to the design and the experimental evaluation of a domotics framework centered on a SIP-based Home Gateway (SHG). While SIP is used to build a common control plane, the SHG is in charge of translating the user commands from and to the specific domotics languages, thus allowing the user to control all domotics devices either at home or away from it, using his mobile terminal or his favourite SIP client, in a transparent, uniform, and simple way. In particular, from the user perspective, the considered approach permits to integrate heterogeneous indoor devices and networks, allowing the composition of dynamic and pervasive services (including interpersonal communications and multimedia). The majority of the wireless standards used in the domotics scenario operate into the unlicensed 2.4 GHz ISM band, which can be exploited by multiple users and networks at the same time. The coexistence of different devices operating in proximity of each other can be troublesome and could lead to relevant performance degradation. Hence, the analysis of the designed architecture and of the SHG prototype considers both the performance of the software framework and the negative effects produced by the simultaneous interference among the widespread wireless technologies.

Publications

Rosario G. Garroppo, Loris Gazzarrini, Stefano Giordano, and Luca Tavanti, “Experimental evaluation of a SIP-based Home Gateway with multiple wireless interfaces for domotics systems”, submitted to “Journal of Computer Networks and Communications”

Rosario G. Garroppo, Loris Gazzarrini, Stefano Giordano, and Luca Tavanti, “A SIP-based Home Gateway for domotics systems: from the architecture to the prototype”, submitted to “IEEE Transactions on Consumer Electronics”