Title: Where, When, and How mmWave is Used in 5G and Beyon,
Abstract: Wireless engineers and business planners commonly raise the question on
where, when, and how millimeter-wave (mmWave) will be used in 5G and beyond.
Since the next generation network is not just a new radio access standard, but
instead an integration of networks for vertical markets with diverse
applications, answers to the question depend on scenarios and use cases to be
deployed. This paper gives four 5G mmWave deployment examples and describes in
chronological order the scenarios and use cases of their probable deployment,
including expected system architectures and hardware prototypes. The paper
starts with 28 GHz outdoor backhauling for fixed wireless access and moving
hotspots, which will be demonstrated at the PyeongChang winter Olympic games in
2018. The second deployment example is a 60 GHz unlicensed indoor access system
at the Tokyo-Narita airport, which is combined with Mobile Edge Computing (MEC)
to enable ultra-high speed content download with low latency. The third example
is mmWave mesh network to be used as a micro Radio Access Network ({\mu}-RAN),
for cost-effective backhauling of small-cell Base Stations (BSs) in dense urban
scenarios. The last example is mmWave based Vehicular-to-Vehicular (V2V) and
Vehicular-to-Everything (V2X) communications system, which enables automated
driving by exchanging High Definition (HD) dynamic map information between cars
and Roadside Units (RSUs). For 5G and beyond, mmWave and MEC will play
important roles for a diverse set of applications that require both ultra-high
data rate and low latency communications.