An Optimal Joint User Association and Power Allocation Algorithm for Secrecy Information Transmission in Heterogeneous Networks

Table 1

System parameters.

Parameters	Value
Bandwidth of BSs	1 MHz, 1 MHz, 2 MHz, 2 MHz, 2 MHz
Minimum data rate requirements of UEs	1 Mbps, 2 Mbps, 0.5 Mbps, 0.5 Mbps, 1 Mbps
Small-scale fading distribution	Rayleigh fading with zero mean and unit variance
Channel path loss model	dB, where denotes the distance
Shadowing effect	Lognormal with zero mean and unit variance