Performance Analysis of LTE in Rich Multipath Environments Considering the Combined Effect of Different Download Scheduling Schemes and Transmission Modes

Abstract

Long Term Evolution (LTE) is the new standard specified by Third Generation Partnership Project (3GPP) on the way towards the 4G mobile network. The LTE introduces enhance data link mechanisms to support successful implementation of new data services across the network. The incorporated scheduling mechanisms can significantly contribute to this goal. In this paper, we have compared the performance of Best Channel Quality Indicator (Best CQI) and Proportional Fair (PF) which are the two most popular scheduling algorithms used in LTE. The performance was compared in rich multipath environment using Transmit Diversity (TxD) and Open Loop Spatial Multiplexing (OLSM). In recent past similar comparison was carried out for rural environments (1). In the rural environment the multipath effect was not significant. The results of simulation showed that both the Best CQI and PF perform fairly well for TxD in comparison with the OLSM technique. So here in this paper we have considered the urban environment which demonstrates significant effect due to multipath. The simulation results shows improvement in total throughput is not so significant using OLSM technique for the both the scheduling without much deterioration in the BLER. When the throughput is increased in OLSM, the BLER gets deteriorated drastically. Thus TxD is found to be working efficiently in rich multipath environments as it had been found previously for the rural environment.