1 Department of Electronic Systems, The Technical Faculty of IT and Design, Aalborg University, VBN2 Radio Access Technology, The Technical Faculty of IT and Design, Aalborg University, VBN3 Nokia Networks, Aalborg
In this paper we evaluate the performance of downlink channel dependent scheduling in both time and frequency domains. The investigation is based on 3GPP UTRAN long term evolution parameters. A scheduler framework is developed encompassing frequency domain packet scheduling, HARQ management and fairness control. By dividing the packet scheduler into a time-domain and a frequency-domain part we can effectively control the fairness among users. Different algorithms are applied at each scheduler part and the combined performance is evaluated in terms of cell throughput, coverage and capacity (number of users supported at a given coverage target). We show that our scheduler can provide a gain of around 35% in both throughput and coverage over opportunistic timedomain only scheduling. It is furthermore shown that by using an equal throughput scheduler, coverage can be improved by 75% at the expense of a 20% loss in average cell throughput in comparison to the proportional fair scheduler.