  In this article, we put forward the mobile crowd sensing paradigm based on
ubiquitous wearable devices carried by human users. The key challenge for mass
user involvement into prospective urban crowd sending applications, such as
monitoring of large-scale phenomena (e.g., traffic congestion and air pollution
levels), is the appropriate sources of motivation. We thus advocate for the use
of wireless power transfer provided in exchange for sensed data to incentivize
the owners of wearables to participate in collaborative data collection. Based
on this construction, we develop the novel concept of wirelessly powered crowd
sensing and offer the corresponding network architecture considerations
together with a systematic review of wireless charging techniques to implement
it. Further, we contribute a detailed system-level feasibility study that
reports on the achievable performance levels for the envisioned setup. Finally,
the underlying energy-data trading mechanisms are discussed, and the work is
concluded with outlining open research opportunities.
