4Spectrum
Harri Holma1 and Takehiro Nakamura2
1Nokia, Finland
2NTT DOCOMO, Japan
4.1 Introduction
Spectrum is the key asset for mobile operators. The available spectrum is a major factor in defining how much capacity and how wide a coverage the mobile network can provide. This chapter discusses the different spectrum options for 5G, their characteristics, and the expected spectrum for the early phase of 5G deployments. 5G is the first ever mobile radio system that is designed to utilize any spectrum between approximately 400 MHz and 90 GHz. 5G is also designed to be deployed in licensed, shared, and unlicensed spectrum bands. 5G can utilize Frequency Division Duplex (FDD) technology for paired spectrum and Time Division Duplex (TDD) technology for unpaired spectrum. When the same 5G technology is deployed on different bands, it will be efficient to fully exploit the capacity and coverage properties of the bands optimally together.
The motivations for 5G deployments on different spectrum bands are summarized in Figure 4.1. The high bands at millimeter wave have lot of spectrum and enable high capacity and data rates. The low bands have great propagation and provide wide area coverage. Millimeter wave generally refer to the frequencies where the wavelength is ...
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