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TDD based 5G networks performance analysis and radio resource dimensioning with different network geometry models

Abstract : A new generation of cellular networks, known as 5G new radio (NR), has been standardized through improvements in the current 4G/4G+ concepts and features in order to bring a new level of flexibility, scalability and efficiency. Time division duplex (TDD) is expected to be one of the key features of 5G NR since it offers more advantages than frequency division duplex (FDD) mode in terms of capacity, flexibility and implementation adequacy with other features, such as full dimension multiple input multiple output antenna (FD-MIMO) technology. A variant operational mode of TDD, known as D-TDD, is in the scope. It is designed to deal with uplink (UL) and downlink (DL) traffic asymmetry since it is based on instantaneous traffic estimation and offers more flexibility in resource assignment. However, the use of D-TDD requires new interference mitigation schemes capable to handle two additional types of interference called cross link interference (CLI) and stands for DL to UL and UL to DL interference. The first part of this thesis is devoted to tackle the problem of interference modeling in D-TDD based macro-cell and small-cell deployments. We provide a complete analytical approach to derive relevant metrics, such as interference-to-signal-ratio (ISR) and the coverage probability formulas, considering adequate geometry models for each type of deployment. Then, we propose an interference mitigation scheme based on 3D beamforming for macro-cells and a cell-clustering scheme for small-cells. Additionally, we investigate another problematic which is Orthogonal Frequency Division Multiplex (OFDM) radio resource dimensioning. Since 5G NR takes in consideration a wide array of emerging use cases and also the possibility of having future requirements, the third Generation Partnership Project (3GPP) comes up with a variant of OFDM known as scalable OFDM and having different sub carriers' spacing. This feature appears to be an ideal choice for 5G NR since it offers a high spectral efficiency, robustness to selective fading channels, convenience with diverse spectrum bands and compatibility with other features. Therefore, dimensioning OFDM is a major task to accomplish in the context of NR. To this purpose, we provide an analytical model to dimension OFDM based systems with a proportional fair resources' allocation policy. We model indoor users by a spatial PPP and outdoor users according to a Cox process driven by PLP. Different analytical and numerical results are provided to justify the accuracy of this model.
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Jalal Rachad. TDD based 5G networks performance analysis and radio resource dimensioning with different network geometry models. Networking and Internet Architecture [cs.NI]. Institut Polytechnique de Paris, 2019. English. ⟨NNT : 2019IPPAT008⟩. ⟨tel-02533600⟩

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