This is something like the "System Model" section in "How to Write a Technical Paper: Structure and Style of the Epitome of your Research":

System Model

In the system model section, you explicitly describe all the
hypotheses and assumptions of the environment on which
the problem will be stated. Put good effort in realizing
all explicit and implicit assumptions that you make, and
clearly state them. It is important to provide support for
your assumption choices. The more valid and acceptable
your assumptions are, the more valid and acceptable your
work will be.
The system model section should always have a figure.
The figure should demonstrate the parameters of your
system model. Prepare the figure so that it can later be
reused or enhanced to demonstrate your solution.