On the Performance of PF, MLWDF and EXP/PF algorithms in LTE

Huthaifa Al Jaradat,Kumbesan Sandrasegaran

doi:10.24297/ijct.v8i1.3429

Abstract

This paper explores the performance of three packet scheduling algorithms, namely, Proportional Fair (PF) algorithm, Exponential/Proportional Fair (EXP/PF) algorithm and Maximum Largest Weighted Delay First (MLWDF), from the real time traffic perspectives. Simulation results showed that in the downlink of the 3GPP LTE system, the MLWDF outperforms the PF and the EXP/PF algorithms in terms of packet throughput, packet-loss ratio, packet latency, fairness index and total cell spectral efficiency.

Highlights

Long Term Evolution (LTE) is proposed by the Third Generation Partnership Project (3GPP) in order to provide support for a high-speed data networks
When the number of users exceeds 20, the Proportional Fair (PF) algorithm suffers from a sharp decrease in the average throughput, while the Maximum Largest Weighted Delay First (MLWDF) and Exponential/Proportional Fair (EXP/PF) algorithms show a small decline in the average throughput per flow
When the number of users exceeds 40 users, the PF algorithm shows sharp increase in the Packet Loss Ratio (PLR) value compared to the other algorithms; it has a value of 3% when the number of users is 80, whereas it has values of 1.5 % and 0.5% for the EXP/PF algorithm and MLWDF algorithm, respectively, at the same number of users

Summary

Introduction

Long Term Evolution (LTE) is proposed by the Third Generation Partnership Project (3GPP) in order to provide support for a high-speed data networks. The access technology in the downlink of the 3GPP LTE system is the Orthogonal Frequency Division Multiple Access (OFDMA). The radio access network of the LTE is composed of only single logical node called evolved Node Base station (eNB). The eNB handles all Radio Resource Management, including packet scheduling. Packet scheduler is responsible for transmitting user’s data packets and efficient utilization of the available radio resources, so that users’ Quality of Service (QoS) can be maintained [2]. In order to satisfy users’ QoS, different packet scheduling algorithms have been developed for different traffic types.

Downlink 3GPP LTE system model

Packet Scheduling Algorithms

Simulation Environment

Simulation Results

Conclusion