i-Five proposes to design and develop an advanced MAC that will be able to exploit the superior characteristics of the existing FBMC PHY for both dynamic and interference limited mobile network (such as heterogeneous and small cell networking HetSNet environments) and spectrum sharing scenarios. The MAC approach will be validated on a system level experimental platform to contribute to a deeper understanding of the existing FBMC approaches in terms of their impact on the newly devised interference mitigation techniques in practical environments, and their gain over legacy OFDM based solutions. Such innovations, supported through research together with experimental proof of concepts planned in i-Five, will encourage development of new products/services beyond what is already available today or likely to be available in the next 5 years.