  The fifth generation of mobile networks (5G) represents the latest
development in mobile communications. It has been designed to support several
types of data traffic and to meet more performance requirements than ever
before. These characteristics make 5G very attractive for current but also
novel public and private industries and services. However, because of coverage,
regulatory, business, and security reasons, many of these novel applications
can only be deployed as part of a private network. The cost of licensed
frequencies makes such approach prohibitive for many stakeholders, and
therefore unlicensed frequency bands represent a more affordable option. Even
so, private 5G networks for use in globally unlicensed frequency bands do not
yet exist. In this paper we present the first end-to-end private 5G network
operating in a globally unlicensed frequency band, using general purpose
computers, open-source software and software-defined radio. We evidence its
working and show that the choice of the hardware can significantly affect the
performance of the network.
