  Reconfigurable intelligent surface (RIS)-assisted communication appears as
one of the potential enablers for sixth generation (6G) wireless networks by
providing a new way to optimize the communication system performance. This
paper aims to fill an important gap in the open literature by providing an
accurate, source, and widely applicable RIS channel model for mmWave
frequencies. Our model is not only applicable in various indoor and outdoor
environments but also includes the physical aspects of wireless propagation in
the presence of an RIS as well as various practical 5G channel modeling issues.
The open-source and comprehensive SimRIS Channel Simulator is also introduced
in this paper to be used in computer simulations of RIS-assisted communication
systems.
