Abstract
This chapter considers the techniques that the 5G air interface uses to measure the attenuations and phase shifts that appear between the transmit and receive antennas, and to adapt to them. The chapter begins by discussing how the base station transmits its channel state information reference signals, and how the mobile uses those signals to return downlink channel state information such as the channel quality indicator, precoding matrix indicator and rank indication. Those signals are usually delivered on the physical uplink control channel, which is also addressed as part of the chapter. Finally, the chapter discusses how the mobile transmits its sounding reference signals, which the base station uses to measure the state of the uplink.
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