QoS-Aware LTE Downlink Scheduler for VoIP in Relation With Power Saving

Abstract: The addition of multimedia services in cellular communication systems has created new challenges of resource allocation and power optimization. The requirement of efficient resource allocation is vital in downlink than uplink due to high traffic flows. These multimedia applications require more power therefore power optimization has gained a key role in future communication systems. This study investigates the performance of the downlink scheduling of Long Term Evolution (LTE) cellular communication network along efficient power utilization of User Equipment (UE). The goal is to develop a downlink scheduling technique that improves the QoS for multimedia services in relation to the use of power saving scheme i.e. Discontinuous Reception (DRX). The DRX effectively improves power consumption at the cost of QoSdegradation due to higher packet delays and packet losses. The traditional scheduling schemes were not designed to guarantee LTE QoS constraints in relation to energy. The proposed algorithm considers key QoS parameters during scheduling with fair resource allocation while minimizing packet delay and packet loss even in power saving environment. The performance of proposed scheduler with power saving technique is analyzed and its impact on QoS is evaluated in term of throughput, packet loss rate, fairness and packet delay. The proposed scheduler is compared with traditional scheduling algorithms such as Round Robin, Proportional Fair and Best CQI. The simulation results show that the proposed algorithm’s performance is better as compared to traditional scheduling algorithms in power saving and non-power saving environments.