Purnomowati, E. B., M. Rahma, and R. Yuwono. “Analysis of Proportional Fair Scheduling Algorithm for Long Term Evolution (LTE) Uplink ”. International Journal of Control and Automation, Vol. 11, no. 2, Dec. 2018, pp. 11 -24, http://sersc.org/journals/index.php/IJCA/article/view/120.