Not only did the fffth generation mobile communication system increase the data rate, capacity and coverage, but also raise a public concern regarding human exposure to electromagnetic ffelds (EMFs). This thesis project assessed EMF exposure in practical indoor scenarios with a beamforming transmitter through electromagnetic and biologic level of simulations and a validation framework. 3D indoor environments were constructed based on measured dielectric constants of materials, enabling realistic ray-tracing simulations in beamforming cenarios. The obtained simulation results were then combined to a multi-layer skin model to evaluate localized absorption mechanisms. This study also highlighted the inffuence of environmental geometry on exposure levels. An algorithm of bridging the gap between indoor wave propagation and exposure assessment regarding biological tissues was proposed for the ffrst time. It is illustrated by the results that beamforming technology introduced time and user dependency to the exposure levels, while these predicted values remained well below the limit in ICNIRP of 20 W/m2.