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978-3-8439-3840-2, Reihe Elektrotechnik
Rodrigo Alberto Justavino Castillo
Interference Management in Mobile Networks
277 Seiten, Dissertation Technische Universität Hamburg-Harburg (2018), Softcover, A5
This thesis deals with interference management in various types of wireless networks. Most modern mobile communication systems such as LTE allow the reuse of the same frequency bandwidth in all cells. A consequence of this aggressive reuse is that users located in places where the coverage of several cells overlaps can experience inter-cell interference. The number of interfered users increases in heterogeneous deployments, as small cells are deployed inside the coverage area of large cells; therefore, the overlapping coverage area of the cells increases. Moreover, because of the power differences between large and small cells, the interference levels can be higher compared to the homogeneous network case.
In this thesis, first, a summary of the current mechanisms available in LTE for interference management is given. After analyzing interference scenarios in a heterogeneous LTE network, two interference management schemes are proposed. The first one is based on interference avoidance and compatible with LTE release 10 and the second one is based on interference cancellation using the rate splitting scheme of Han and Kobayashi and it is proposed for future releases of the LTE standard.
In addition to the proposed interference cancellation scheme, an investigation into the use of Markov chain Monte Carlo techniques for MIMO joint detection in LTE is introduced. The motivation for this investigation is the reduction of complexity in joint detectors for interference cancellation.
Finally, after analyzing interference management in terrestrial scenarios, the investigation moves towards scenarios which consider the special case of a mobile user flying on an airplane above a GSM or LTE network. These scenarios have become more common since airlines started to offer onboard users with mobile services. The objective of this study was to evaluate the possibility of a connection between an existing terrestrial network and an airborne mobile user.