37 50 100 150 200 250 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 Number of users System Average Fairness  Round Robin Location based Round Robin; W=K Greedy Round Robin; W=6 Proportional Fair Greedy Round Robin; W=3 Greedy Fig. 6. Average system fairness for different number of users considering different scheduling schemes with β = 2 . 6 , C =60 dB, P max =1W, σ $^{2}$=-174 dBm/Hz.