On the Flexible 5G Dense Deployment Air Interface for Mobile Broadband

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1st International Conference on 5G for Ubiquitous Connectivity
Eeva Lähetkangas1, Kari Pajukoski1, Jaakko Vihriälä1, Esa Tiirola1
1: Nokia Networks

    In this paper we contemplate 5G frame structure for dense deployment. We discuss harmonized OFDM concept, in which the cyclic prefix length and subcarrier spacing are functions of carrier frequency while FFT size and base clock remain constant. The subframe structure consists of time separated control and data, enabling low latency, flexible UL/DL ratio switching and high spectral efficiency with low cost transceiver. Analysis shows that the overheads are relatively small. The subframe structure also allows extended sleep periods, enabling considerably reduced power consumption.