2018 25th International Conference on Telecommunications (ICT)

in 2018 25th International Conference on Telecommunications (ICT) (2018)

The anticipated exponential growth in network traffic is posing significant challenges for the implementation of 5G networks. In this context, a major problem is the backhaul network which acts as a ... [more ▼]

The anticipated exponential growth in network traffic is posing significant challenges for the implementation of 5G networks. In this context, a major problem is the backhaul network which acts as a bottleneck preventing the efficient flow of ultra-dense and heavy traffic between the end users and the core network. Spectrum scarcity has emerged as the primary problem encountered when trying to accommodate the traffic upsurge. In this paper, we investigate the carrier allocation problem in the context of Integrated Satellite-Terrestrial Backhaul (ISTB) networks. In particular, we consider the satellite component to be integrated with the conventional terrestrial wireless backhaul network thus providing evident benefits in terms of data-offloading. To enhance the overall spectral efficiency of the proposed network, we consider that both terrestrial and satellite segments operate in the Ka band, where the sharing between terrestrial microwave links and satellite communications is already allowed. A novel carrier allocation algorithm based on fairness is proposed, which ensures that all backhaul links are continuously active to satisfy the operator's coverage needs. The problem is NP-hard by definition. As a consequence, we present a two-step sequential carrier allocation strategy specifically tailored to tackle the interference issues emerging from the spectral co-existence. Supporting results based on numerical simulations show that the proposed carrier allocation can provide a 2x improvement in terms of spectral efficiency when compared to benchmark terrestrial-only backhaul networks. [less ▲]

2018 Lab Report Computational Mechanics Legato-team and Z-team

Report (2018)

21st century skills at work. The incremental contribution of complex problem solving skills to occupational choice and success

Scientific Conference (2017)

21st century skills. Recent advancements and international developments. Special Issue

in Thinking Skills and Creativity (2015), 8

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Speeches/Talks (2020)

§§ 241-249 AktG zur Nichtigkeit und Anfechtung von HV-Beschlüssen, Kölner Kommentar zum Aktiengesetz

in Noack, Ulrich; Zöllner, Wolfgang (Eds.) Kölner Kommentar zum Aktiengesetz (2017)

„25 Jahre Integration durch Sport - weiter so?“ Erfolge, Potentiale, Herausforderungen, Grenzen

Speeches/Talks (2015)

27th International Symposium on Temporal Representation and Reasoning, {TIME} 2020, September 23-25, 2020, Bozen-Bolzano, Italy

Book published by Schloss Dagstuhl - Leibniz-Zentrum f{\"{u}}r Informatik (2020)

§§ 29, 30 und Derivate-Verordnung betreffend Risiko- und Liquiditätsmanagement

in Kapitalanlagegesetzbuch, Kommentar (2019)

2d gauge theories and generalized geometry

in Journal of High Energy Physics (2014)

We show that in the context of two-dimensional sigma models minimal coupling of an ordinary rigid symmetry Lie algebra g leads naturally to the appearance of the “generalized tangent bundle” TM ≡ T M ⊕ T ... [more ▼]

We show that in the context of two-dimensional sigma models minimal coupling of an ordinary rigid symmetry Lie algebra g leads naturally to the appearance of the “generalized tangent bundle” TM ≡ T M ⊕ T ∗ M by means of composite fields. Gauge transformations of the composite fields follow the Courant bracket, closing upon the choice of a Dirac structure D ⊂ TM (or, more generally, the choide of a “small Dirac-Rinehart sheaf” D), in which the fields as well as the symmetry parameters are to take values. In these new variables, the gauge theory takes the form of a (non-topological) Dirac sigma model, which is applicable in a more general context and proves to be universal in two space-time dimensions: a gauging of g of a standard sigma model with Wess-Zumino term exists, iff there is a prolongation of the rigid symmetry to a Lie algebroid morphism from the action Lie algebroid M × g → M into D → M (or the algebraic analogue of the morphism in the case of D). The gauged sigma model results from a pullback by this morphism from the Dirac sigma model, which proves to be universal in two-spacetime dimensions in this sense. [less ▲]