Yoshihisa Kishiyama and Tetsuro Imai


11.1 Introduction

This chapter presents propagation measurements for above 6 GHz and field experiments on 5G radio technologies using sub-6-GHz and millimeter waves (mmW).

5G radio utilizes a wide range of frequency bands from below 6 to 100 GHz. In 4G and earlier generation systems, frequency bands of above 6 GHz have not been used due to difficulties involving mobile communication systems, for example, higher propagation loss. Use of frequency bands above 6 GHz is a new challenge for the development and operation of mobile communication systems. It is important to know the fundamental characteristics of above-6-GHz bands used in 5G radio. Propagation measurements and field experiments are essential to comprehend the fundamental characteristics of above-6-GHz bands.

Compared to above 6 GHz, below 6 GHz is valuable spectrum for mobile communication because of good penetration and robustness to obstacles. However, spectrum opportunities below 6 GHz are expected to be limited to a few hundreds of megahertz. To obtain a higher data rate from multi-Gbps to 10 Gbps with spectrum below 6 GHz, it is essential to employ higher rank Massive Multiple Input Multiple Output (MIMO), which is evaluated in experiments using sub-6-GHz bands.

On the ...

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