Uppsala universitet

The Role of Small Cells, Coordinated Multipoint, and Massive MIMO in 5G.

Volker Jungnickel and Konstantinos Manolakis, , Fraunhofer Heinrich Hertz Institute,
Wolfgang Zirwas and Berthold Panzner , Nokia Solutions and Networks,
Volker Braun , Alcatel Lucent Bell Labs,
Moritz Lossow , Telekom Innovations Laboratories,
Mikael Sternad, and Rikke Apelfröjd, , Uppsala University, and
Tommy Svensson , Chalmers.

IEEE Communications Magazine , vol. 52, no 5, May 2014, pp. 44-51.
© 2014 IEEE

Paper in Pdf

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-smallcell 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.

Related publications:
PhD Thesis by Rikke Apelfröjd, 2018

A tutorial (slides in pdf) by M. Grieger TU Dresden, T. Svensson, CTH, M. Sternad UU and W. Zirwas, NSN on Coordinated Multi-Point in Cellular Networks: From theoretical gains to realistic solutions and their potentials, at IEEE ICC 2013 and at IEEE ISWCS 2013.

Paper at IEEE Trans. on Communications 2019 on Joint reference signal design and Kalman/Wiener channel estimation for FDD Massive MIMO.

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