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%0 Thesis %A Voicu, Andra Mihaela %T Spectrum sharing for broadband technology coexistence in the unlicensed bands %I Rheinisch-Westfälische Technische Hochschule Aachen %V Dissertation %C Aachen %M RWTH-2020-01766 %P 1 Online-Ressource (XI, 243 Seiten) : Illustrationen, Diagramme %D 2020 %Z Veröffentlicht auf dem Publikationsserver der RWTH Aachen University %Z Dissertation, Rheinisch-Westfälische Technische Hochschule Aachen, 2020 %X The increasing demand in data traffic volume is expected to be met by extreme wireless network densification and spectrum bands accommodating multiple technologies. An example is the 5 GHz unlicensed band where LTE was recently proposed to operate in, alongside Wi-Fi. Such solutions will likely lead to an increased interference level, as well as complex inter-technology interactions, so appropriate spectrum sharing mechanisms are required. The most challenging wireless coexistence cases occur in the unlicensed bands, where any technology is in principle allowed to transmit. This thesis addresses two research questions pertinent to this context: (i) how to design robust spectrum sharing mechanisms that allow multiple technologies to transmit; and (ii) how to reliably evaluate the coexistence performance of different spectrum sharing mechanisms. We address the posed questions with a focus on broadband technologies carrying high traffic loads in the unlicensed bands. Our four major contributions are as follows. (1) We obtain comparable and generalizable performance results for many key spectrum sharing design parameters and are thereby the first to present such a systematic evaluation for consistent assumptions and deployment scenarios. (2) We compare and validate diverse performance evaluation methods, i.e. various simulations, measurements, and an analytical model. The major outcome of this study is a set of recommendations on how to evaluate the impact of different spectrum sharing parameters on the network performance. Moreover, we propose a novel computationally-efficient inter-technology simulation model, which takes a hybrid approach to estimate reliably both network-wide and per-link performance. (3) We present an extensive inter-technology coexistence study inspired by Wi-Fi/LTE coexistence, where we consider different spectrum sharing approaches for distributed non-optimized configurations, as typical for the unlicensed bands. (4) We study the coexistence of different Wi-Fi deployments with advanced features, i.e. channel bonding and adaptive sensing thresholds, which are also relevant for facilitating inter-technology coexistence. Overall, this thesis is the first to present comparable and generalizable results from extensive coexistence studies of heterogeneous wireless technologies, to identify appropriate performance evaluation methods, and to propose a novel, rigorously validated, computationally efficient simulation model for inter-technology coexistence. %F PUB:(DE-HGF)11 %9 Dissertation / PhD Thesis %R 10.18154/RWTH-2020-01766 %U https://publications.rwth-aachen.de/record/782268