  By all measures, wireless networking has seen explosive growth over the past
decade. Fourth Generation Long Term Evolution (4G LTE) cellular technology has
increased the bandwidth available for smartphones, in essence, delivering
broadband speeds to mobile devices. The most recent 5G technology is further
enhancing the transmission speeds and cell capacity, as well as, reducing
latency through the use of different radio technologies and is expected to
provide Internet connections that are an order of magnitude faster than 4G LTE.
Technology continues to advance rapidly, however, and the next generation, 6G,
is already being envisioned. 6G will make possible a wide range of powerful,
new applications including holographic telepresence, telehealth, remote
education, ubiquitous robotics and autonomous vehicles, smart cities and
communities (IoT), and advanced manufacturing (Industry 4.0, sometimes referred
to as the Fourth Industrial Revolution), to name but a few. The advances we
will see begin at the hardware level and extend all the way to the top of the
software "stack."
  Artificial Intelligence (AI) will also start playing a greater role in the
development and management of wireless networking infrastructure by becoming
embedded in applications throughout all levels of the network. The resulting
benefits to society will be enormous.
  At the same time these exciting new wireless capabilities are appearing
rapidly on the horizon, a broad range of research challenges loom ahead. These
stem from the ever-increasing complexity of the hardware and software systems,
along with the need to provide infrastructure that is robust and secure while
simultaneously protecting the privacy of users. Here we outline some of those
challenges and provide recommendations for the research that needs to be done
to address them.
