  The increasing demands for highly individual products as well as for flexible
production lines represent new challenges. To address these demands, future
plants must be highly flexible and dynamically reconfigurable. Current systems
are usually based on wired technologies for the connection of sensors,
actuators, and controlling or monitoring devices that allow only very limited
dynamics. New applications, such as the use of robots, drones, or
reconfigurable production lines, require the exploitation of wireless
communication technologies. However, current technologies are not able to meet
the high requirements in terms of latency, robustness, resilience and data
rate. The introduction of the 5th generation (5G) cellular communication system
will meet these requirements for the first time. Besides the use of radio-based
solutions in new plants - so-called greenfield scenarios - deploying 5G also
represents an efficient migration of existing plants - so-called brownfield
scenarios - to Industry 4.0. In order to ensure that the challenging
requirements are indeed meet in practical deployments of the new 5G technology,
a tailor-made architecture is being developed within the Tactile Internet 4.0
(TACNET 4.0) project. As a basis for the design of the architecture,
representative Industry 4.0 application scenarios, which are also be considered
by the 3rd Generation Partnership Project (3GPP), were analyzed and compliance
with the latest developments in the relevant standardization is also our
target. The paper gives an overview of the considered use cases as well as the
relevant reference architectures and the design process of the TACNET 4.0
architecture.
