  To ensure the high level of automation required in today's industrial
applications, next-generation wireless networks must enable real-time control
and automation of dynamic processes with the requirements of extreme
low-latency and ultra-reliable communications. In this paper, we provide a
performance assessment for the co-existence of a macro (eMBB) and a local
factory (URLLC) network and evaluate the network conditions under which the
latency and reliability requirements of factory automation applications are
met. In particular, we evaluate the co-existence of the eMBB and URLLC networks
under two scenarios: (i) synchronized TDD, in which both networks follow the
same TDD pattern, and (ii) unsynchronized TDD, in which the eMBB and URLLC
networks follow different TDD patterns. Simulation results show that the high
downlink interference from the macro base stations towards the factory results
in a reduction of the downlink URLLC capacity and service availability in case
of synchronized TDD and a reduction of the uplink URLLC capacity and service
availability in case of unsynchronized TDD. Finally, it is shown that a
promising case for co-existence is the adjacent channel allocation, for both
synchronized and unsynchronized TDD deployments. Here, the required isolation
to protect the URLLC network in the worst-case scenario where the factory is
located next to a macro site can be handled via the factory wall penetration
loss (e.g., considering high concrete or metal-coated building walls) along
with other solutions such as filters, larger separation distance, and band
pairing.
