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The role of small cells, coordinated multipoint, and massive MIMO in 5G

: Jungnickel, V.; Manolakis, K.; Zirwas, W.; Panzner, B.; Braun, V.; Lossow, M.; Sternad, M.; Apelfröjd, R.; Svensson, T.


IEEE Communications Magazine 52 (2014), Nr.5, S.44-51
ISSN: 0163-6804
ISSN: 1558-1896
Bundesministerium für Bildung und Forschung BMBF
Converged Heterogeneous Metro/Access Infrastructure
European Commission EC
FP7-ICT; 318600; SODALES
European Commission EC
FP7-ICT; 317669; METIS
Deutsche Forschungsgemeinschaft DFG
JU 2793/3-1; CoMP Impairments
Fraunhofer HHI ()

5G will have to support a multitude of new applications with a wide variety of requirements, including higher peak and user data rates, reduced latency, enhanced indoor coverage, increased number of devices, and so on. The expected traffic growth in 10 or more years from now can be satisfied by the combined use of more spectrum, higher spectral efficiency, and densification of cells. The focus of the present article is on advanced techniques for higher spectral efficiency and improved coverage for cell edge users. We propose a smart combination of small cells, joint transmission coordinated multipoint (JT CoMP), and massive MIMO to enhance the spectral efficiency with affordable complexity. We review recent achievements in the transition from theoretical to practical concepts and note future research directions. We show in measurements with macro-plus-small-cell scenarios that spectral efficiency can be improved by flexible clustering and efficient user selection, and that adaptive feedback compression is beneficial to reduce the overhead significantly. Moreover, we show in measurements that fast feedback reporting combined with advanced channel prediction are able to mitigate the impairment effects of JT CoMP.