This research work is focused on
wireless communication algorithms and applications to provide
ubiquitous access to wireless resources for mobile users.
Communication protocol considered is mainly the IEEE 802.11
radio frequency. Particular emphasis is given to the location and
context awareness, needed in order to adapt the behavior of the
application to the information received from the network and the
Complex context information can be derived from a GPS system
installed on handheld devices, from sensor data integration and
territorial recognition, by using signal strength or performing
signal triangulation. Our application context is that of an
handheld based tour guide systems that may vary the content it
displays (video or audio) on a pocketPC unit, in accordance with
the users physical location during an archaeological site visit.
Another field that we experienced is that of medical
applications: mobile units can be context aware and support
doctors and nurses in the selection of drugs from a wide lists of
available drugs and diseases connected to specific symptoms.
Another research field is in ad-hoc networking environment
(MANET), with power-restricted communication protocols. An ad hoc
network is a collection of wireless hosts forming a temporary
network without the aid of any centralized administration. Hosts
communicate establishing multi-hop paths by means of a route
discovery algorithm, usually based on the flooding mechanism.
These networks show a high probability of disconnections, with a
reduced communication bandwidth. Moreover hosts are often
heterogeneous and with limited battery power. Middleware for
these systems must ensure network connectivity, and adapt the
quality of service to resource availability: such middleware
shall be developed, using location awareness and application
awareness to improve the quality of service in an experimental
emergency disaster environment, where rescue personnel must