  This article presents an overview of future truly personal communications,
ranging from networking inside the human body to the exchange of data with
external wireless devices in the surrounding environment. At the nano- and
micro-scales, communications can be realized with the aid of molecular
mechanisms, Forster resonance energy transfer phenomenon, electromagnetic or
ultrasound waves. At a larger scale, in the domain of Body Area Networks, a
wide range of communication mechanisms is available, including smart-textiles,
inductive- and body-couplings, ultrasounds, optical and wireless radio
transmissions, a number of mature technologies existing already. The main goal
of this article is to identify the potential mechanisms that can be exploited
to provide interfaces in between nano- and micro-scale systems and Body Area
Networks. These interfaces have to bridge the existing gap between the two
worlds, in order to allow for truly personal communication systems to become a
reality. The extraordinary applications of such systems are also discussed, as
they are strong drivers of the research in this area.
