The Analysis of Scheduling Algorithms in Microcellular 4G MIMO WINNER System

Abstract

In this paper impact of resource scheduling algorithms on the in the microcellular 4G environment has been analyzed. Among studied metrics were average user throughput,average cell’s capacity and the quality of provided services,which has been defined as a percentage of users achieving given data rate with defined error rate. Well known memoryless scheduling algorithms such as Round Robin, MaxSNR and Fair Rate have been compared with the algorithms proposed for fading channels in [1], namely Proportional Fair and Score Based algorithms. The latter algorithms take into account both history of the scheduled users and channel conditions. A simple modification has been proposed for all examined scheduling algorithms and its impact on the users and system performance has been analyzed. The above modification rely on a preselection of scheduled users, thus significantly reducing number of computations at the cost of some performance loss.Presented results have been obtained for both uplink anddownlink OFDMA transmission in the multipath MIMOchannels in the Metropolitan Area scenario proposed within the WINNER project. Only the frequency adaptive transmission mode has been considered.