  Reconfigurable Intelligent Surfaces (RISs) are one of the key emerging 6th
Generation (6G) technologies that are expected to improve the link budgets
between transmitters and receivers by adding artificial propagation paths. In
such re-configured propagation environment, Downlink (DL) Multi-User
Multi-Input Multi-Output (MU-MIMO) brings capacity improvement to cellular
networks. It benefits from the spatial dimension offered by MIMO systems to
enable simultaneous transmission of independent data streams to multiple users
on the same radio resources by applying appropriate Beamforming (BF) schemes.
However, in some cases, serving the same subset of users for a long period of
time may cause some undesired regions where the average Electromagnetic Field
Exposure (EMFE) exceeds the regulatory limits. To address this challenge, we
propose in this paper a novel Electromagnetic Field (EMF) aware MU-MIMO BF
scheme that aims to optimize the overall capacity under EMF constraints in
RIS-aided cellular networks.
