  In this work, we present the results of a wideband measurement campaign at 60
GHz conducted inside a Linkker electric city bus. Targeting prospective
millimeter-wave (mmWave) public transportation wearable scenarios, we mimic a
typical deployment of mobile high-end consumer devices in a dense environment.
Specifically, our intra-vehicle deployment includes one receiver and multiple
transmitters corresponding to a mmWave access point and passengers' wearable
and hand-held devices. While the receiver is located in the front part of the
bus, the transmitters repeat realistic locations of personal devices (i) at the
seat level (e.g., a hand-held device) and (ii) at a height 70 cm above the seat
(e.g., a wearable device: augmented reality glasses or a head-mounted display).
Based on the measured received power, we construct a logarithmic model for the
distance-dependent path loss. The parametrized models developed in the course
of this study have the potential to become an attractive ground for the link
budget estimation and interference footprint studies in crowded public
transportation scenarios.
