Multimedia communication over Next Generation Mobile Networks (NGMN) is my current research interest. As my PHD thesis I am working on providing seamless multimedia over WiMAX and LTE technologies. These technologies are the main technologies for the Forth Generation of wireless networks (4G). At the moment I am focused on the handover management and efficient usage of interfaces in multi-interface user equipment (UE). OPNET is being used as the simulation tool for this research project (more information...).