《5GU_Conference_2016_Lahetkangas_etal_On_the_Flexible_5G_Dense_Deployment_Air_Interface》.pdf

On the Flexible 5G Dense Deployment Air Interface for Mobile Broadband Eeva Lähetkangas, Kari Pajukoski, Jaakko Vihriälä, Esa Tiirola Nokia Networks, Oulu, Finland Abstract—In this paper we contemplate 5G frame structure important in a scheduled TDD system where several TDD for dense deployment. We discuss harmonized OFDM concept, in cycles are required for delivering one round trip transmission which the cyclic prefix length and subcarrier spacing are related to control signaling or data transmission. On air functions of carrier frequency while FFT size and base clock interface level, these requirements essentially lead to the remain constant. The subframe structure consists of time demand of fast link direction switching and to short separated control and data, enabling low latency, flexible UL/DL ratio switching and high spectral efficiency with low cost transmission time interval (TTI) length, further leading to the transmission of shorter blocks of data in time and wider blocks transceiver. Analysis shows that the overheads are relatively small. The subframe structure also allows extended sleep periods, in frequency. enabling considerably reduced power consumption. The selection of the radio waveform is an important discussion topic in the