Optimizing Energy Efficiency for Supporting Near-Cloud Access Region of UAV-Based NOMA Networks in IoT Systems

Table 1

Symbol definition.

Symbol	Definition
	The complex flat coefficient in a wireless environment to the downlink channel between CCS and
	Additive white Gaussian noise (AWGN) at with zero mean and variance of
	Additive white Gaussian noise (AWGN) at with zero mean and variance of
	The channel coefficient of the and
	Transmission power at the CCS
	The power-splitting ratio at the
	Expectation operation
	Expectation operation of the flat channel coefficient of
	Expectation operation of AWGN at
	The path-loss of channel model
	The transmitted signal from the CCS to
	Expectation operation of
	The time block fraction where harvests the energy from the CCS
	The total time block where the information is transmitted from the CCS to
	Power allocation coefficient for signal
	Power allocation coefficient for signal
	The energy conversion efficiency at the
Macro	Macro UAVs
RRHs	Remote radio heads
Micro	Micro UAVs