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QoS performance of LTE networks with network coding
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Nowadays the widespread use of variety of smart phones and tabletswith wide range of multimedia application support is driving more dataservice users towards full mobility causing a rapid increase in demandfor mobile data rates. These new devices and multimedia applicationsrequire high data rates and reduced latency to provide better Qualityof Service (QoS). To address these requirements the 3rd GenerationPartnership Project (3GPP) introduces Long-Term Evolution (LTE) witha capability to move towards Fourth Generation (4G) wireless systems. Itis designed to be a high data rate and low latency system that aiming tosupport different types of services. As the demand for massive multimediadelivery over LTE network increases, a novel transmission techniquessuch as Network Coding (NC) are needed.In this thesis work we present the QoS performance analysis of downlinkLTE using an open source simulation libraries, Network Simulator-3(ns-3) and Kodo. The main performance parameters considered are thethroughput, packet delay, spectral efficiency, capacity and coverage. Factorsaffecting the overall performance such as the fading, shadowing,buildings, User Equipment (UE) speed, UE-Evolved Node B (eNB) distanceand traffic load are considered. The scenario used for the analysisincludes multiple UEs and eNBs for different system antennas and systembandwidths. Moreover, Random Linear Network Coding (RLNC) codingscheme is implemented in LTE networks for a simple scenario composedof a single UE, eNB and remote host to assess the usefulness of NC.The results obtained shows the impact of different factors on the systemQoS performance. The throughput, delay, spectral efficiency, capacity andcoverage performances are evaluated and discussed for different systembandwidth and different system antennas with varying transmission power.In addition, network coding has been shown to improve the throughputat a cost of higher packet delay. Moreover, alternatives ways of improvingthe throughput and different variants of NC are discussed. Since theresults are based on both theory and experiments, the analysis anddiscussions made could be considered as a start point in dimensioning anLTE commercial networks. Suggestions for future work and a draft of aconference paper are also given.