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Allocation de ressources et partage de charge adaptés aux architectures de réseaux d'accès basées sur le cloud

Abstract : Over the next few years, the new fifth generation of mobile networks (5G) will face a significant growth in terms of data volumes and number of connected objects. Furthermore, with the emergence of new applications and services such as Internet of Things (IoT), Autonomous Driving (AD), Intelligent Transportation Systems (ITS), Augmented Reality and Industry 4.0 higher performances are required in terms of reliability and Quality of Service (QoS). Meeting these requirements, while reducing the Capital and Operation Expenditures (CAPEX/OPEX), are the pursued goals of the mobile operators. Consequently, Telcos defined a new radio access architecture, called Cloud/ Centralized Radio Access Network (C-RAN). This latter proposes to split the base station into two parts: the Remote Radio Head (RRH) on which only Radio Frequency (RF) operations are executed, and the BaseBand Unit (BBU) where baseband processing is performed. These two units are interconnected through a high-capacity/ low-delay Fronthaul (FH) network. In this thesis, we focus on the C-RAN performances. We propose new modeling approaches allowing the analysis and the tuning of a set of parameters related to cell cooperation and Fronthaul transport. The first part of the thesis is dedicated to resource sharing with cooperation mechanisms in a C-RAN context and H-CRAN (Heterogeneous C-RAN). There sources offered by the Cloud will have to provide the necessary computing capabilities for the processing required to manipulate these flows and make the necessary decisions in a fast, cooperative, coordinated and distributed manner, and in particular to solve radio problems such as interference management. For this purpose, we offer real-time dimensioning tools for resource sharing with interference management, which provides better network stability by maximizing overall throughput. In the other hand, since next generation cellular networks are targeting higher bit rates, lower delays and enhanced inter-cell coordination, higher capacity and lower latency fronthaul solutions are required, among others. The use of Ethernet packet-switched networks for the fronthaul links with a C-RAN architecture are nowadays considered. These will allow leveraging statistical multiplexing gains, infrastructure reuse and cost reduction. Different fronthaul split options are proposed. However, in order to satisfy latency requirements, most of studies advocate the use of lower fronthaul split options, requiring huge fronthaul link capacity. In order to reduce the deployment cost of links and Ethernet switches of the fronthaul while satisfying the stringent latency requirements of next generation mobile networks, we first propose a new decomposition of the functionalities between the radio heads and the BBU pool. Next, we propose a real-time dimensioning tool that allows, according to the split level and the type of radio traffic, to jointly design the sizing rules.
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Submitted on : Thursday, July 23, 2020 - 2:01:11 PM
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  • HAL Id : tel-02905421, version 1

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Hadjer Touati. Allocation de ressources et partage de charge adaptés aux architectures de réseaux d'accès basées sur le cloud. Réseaux et télécommunications [cs.NI]. Institut Polytechnique de Paris, 2020. Français. ⟨NNT : 2020IPPAS009⟩. ⟨tel-02905421⟩

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