Table 1 Simulation parameters

Simulation scenario

2 clusters/macro cell; 4 small cells/cluster

Inter-site distance

30 m

Carrier frequency

3.5 GHz

Bandwidth

10 MHz

Channel model

ITU M.2135 UMi

Transmit power

24 dBm

Scheduling strategy

Proportional fairness (PF)

UE number

2 UE/macro cell

Antenna pattern

Omni-directional

Antenna height

Base station, 6 m

UE, 1.5 m

Antenna gain plus connection loss

5 dBi

UE movement speed

3 km/h

Service type

FTP model 1:

λ _UL = λ _DL = 0.5 (low arrival rate); λ _UL = λ _DL = 1.5 (moderate arrival rate)

Reconfiguration cycle

40 ms

Worst SINR threshold (S-TDD)

0 dB