System Level Modeling and Optimization of the LTE Downlink

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5. Performance Evaluation of Fractional Frequency Reuse in LTEallocation in highly loaded networks. In a less loaded scenario, this could, however,only be accomplished with more complex dynamic coordinated FFR schemes. Forloads lower than 5 UEs per cell, FFR is outright unsuited, as results show alwayssevere throughput degradation compared to simple scheduling 1 .1 Fairness is evaluated network-wide, and not cell-wise. Thus, fairness results for the 1 UE/cellcase are not one.80
6. Summary and Outlook6. Summary and Outlook6.1. SummaryIn this thesis, an accurate, low-complexity link-to-system model for 3GPP LTERelease 8 is presented. The model is based on a ZF linear receiver and separates thelink abstraction procedures into a link quality model and a link performance model.The link quality model outputs a per-subcarrier post-equalization SINR, which thelink performance model compresses via MIESM to an AWGN-equivalent SINR valueand is then mapped to BLER by means of link-level-generated curves.Based one the presented L2S model, a complete LTE system level simulation hasbeen built, which also integrates the network layout (pathloss, shadow fading,eNodeB and UE placement), as well as a Winner Phase II channel model andappropriate MIMO feedback. This allows for performance evaluation of differentscheduling algorithms and interference coordination schemes such as FFR.In Chapter 3, the post-equalization SINR for each of the LTE transmit modes isderived and combined with all of the parameters characterizing an LTE networkdeployment. An extended correlation matrix for generation of spatially-correlatedshadow fading generation is also applied. As for the same correlation distance, asmaller pixel resolution in the pathloss maps requires of more neighbors for thespatial correlation computation, the applied extended correlation matrix increasesthe accuracy of the shadow fading maps in cases where more resolution is needed.For configurations of up to 4×4, the accuracy of the model is validated against linklevel simulations, confirming the accuracy of the L2S model in single- and multi-cellsimulation scenarios.Employing the maximum LTE channel bandwidth of 20 MHz, significant gains insimulation run-time are introduced by employing the presented link abstraction81
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DissertationSystem Level Modeling a
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I hereby certify that the work repo
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KurzfassungDie vorliegende Arbeit p
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ContentsContents1 Motivation and Sc
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Contentsix
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1. Motivation and Scope of Work1. M
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1. Motivation and Scope of Worklaye
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1. Motivation and Scope of Workperf
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BibliographyThe combined throughput
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2. 3GPP Long Term Evolution2. 3GPP
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2. 3GPP Long Term Evolutionup to 30
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2. 3GPP Long Term EvolutionNAS proc
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2. 3GPP Long Term Evolutionchannel
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2. 3GPP Long Term EvolutionSince th
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2. 3GPP Long Term EvolutionThe chan
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2. 3GPP Long Term EvolutionTable 2.
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3. Physical Layer Modeling and LTE
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Page 45 and 46: 3. Physical Layer Modeling and LTE
Page 67 and 68: 4. Extensions to the L2S Model4. Ex
Page 69 and 70: 4. Extensions to the L2S Model4.1.2
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Page 73 and 74: 4. Extensions to the L2S ModelBLER1
Page 75 and 76: 4. Extensions to the L2S ModelThe M
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Page 79 and 80: 4. Extensions to the L2S ModelIn th
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Page 99 and 100: 6. Summary and Outlook6.2. OutlookW
Page 101 and 102: A. SNR-independence of the CLSM Pre
Page 107 and 108: B. Correlation Matrices for Shadow
Page 109 and 110: C. Taylor Expansion of the ZF MSEC.
Page 111 and 112: C. Taylor Expansion of the ZF MSEAp
Page 113 and 114: D. Evaluation of Multi-User GainD.
Page 115 and 116: D. Evaluation of Multi-User GainAvg
Page 117 and 118: Abbreviations and AcronymsAbbreviat
Page 119 and 120: Abbreviations and AcronymsKPILLRL2S
Page 121 and 122: Abbreviations and AcronymsU-PlaneUT
Page 123 and 124: Abbreviations and AcronymsBibliogra
Page 125 and 126: Abbreviations and Acronymsdescripti
Page 127 and 128: Abbreviations and Acronyms[69] Tech
Page 129 and 130: Abbreviations and Acronymsfemto cel
Page 131: Abbreviations and Acronyms[134] Z.
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System Level Modeling and Optimization of the LTE Downlink

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