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Table 1 System parameters. The system parameters considered in the simulation

From: Network utility optimization-based joint user association and content placement in heterogeneous networks

Parameters Value
Maximum cache capacity of BS 20 Mbits
Maximum cache capacity of AP 10 Mbits
File sizes 9, 8, 10, 9, 8, and 10 Mbits
Content fetching delay at BS 0.2 s
Content fetching delay at AP 0.3 s
Maximum numbers of active users of BS and AP 3
Minimum data rate requirements of users 1, 2, 0.5, 0.5, 1, and 2 Mbps
Small scale fading distribution Rayleigh fading with zero mean and unit variance
Channel path loss model 128.1+27 log(d) dB, d denotes the distance