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Fibre deployment of next-generation high-speed broadband networks is considered to be a decisive development for any information-based society, yet investment activities and especially the adoption of fibre-based broadband services take place only very gradually in most countries. This work identifies the most important determinants of the adoption of fibre-based broadband services, using the most recent panel data from the European Union member states (EU27) for the years from 2004 to 2012. The results show that the stricter previous broadband access regulation has a negative impact on adoption, while competitive pressure from mobile networks affects adoption in a non-linear manner. It appears that the approach of strict cost-based access regulation embedded in the EU regulatory framework is at odds with the targets outlined in the European Commission's "Digital Agenda". Finally, we also find strong evidence for network effects underlying the adoption process. (author's abstract) / Series: Working Papers / Research Institute for Regulatory Economics

Although fibre-deployment of next generation access (NGA) broadband networks is considered as a decisive development for any information-based society, investment activities and especially the adoption of fiber-based broadband services take place only very gradually in most countries. This work identifies the most important determinants of NGA broadband adoption, using most recent panel data from the European Union member states (EU27) for the years from 2004 to 2012. The results show that stricter previous broadband access regulation has a negative impact on NGA adoption, while competitive pressure from mobile networks affects NGA adoption in a non-linear manner. It appears that the approach of strict cost-based access regulation embedded in the EU regulatory framework is at odds with the ambitious targets outlined in the European Commission´s "Digital Agenda". Finally, we find strong evidence for network effects underlying the NGA adoption process. (author's abstract) / Series: Working Papers / Research Institute for Regulatory Economics

Fibre deployment of next-generation high-speed broadband networks is considered to be a decisive development for any information-based society, yet investment activities and especially the adoption of fibre-based broadband services take place only very gradually in most countries. This work identifies the most important determinants of the adoption of fibre-based broadband services, using the most recent panel data from the European Union member states (EU27) for the years from 2004 to 2012. The results show that the stricter previous broadband access regulation has a negative impact on adoption, while competitive pressure from mobile networks affects adoption in a non-linear manner. It appears that the approach of strict cost-based access regulation embedded in the EU regulatory framework is at odds with the targets outlined in the European Commission's "Digital Agenda". Finally, we also find strong evidence for network effects underlying the adoption process. (author's abstract) / Series: Working Papers / Research Institute for Regulatory Economics

In this thesis, we will study the concept of k-edge connected and k-connected reliability. There, vertices are modelled as fail-safe and edges fail stochastically independent. For a fixxed k, the network is then considered operational when each pair of vertices has k edge disjoint or internally disjoint paths, respectively, connecting them in the surviving subnetwork. Thus, the property of being operating covers the connectivity of the surviving graph together with some minimum bandwidth. We study essential and irrelevant edges for those reliability measures. Further, we study a splitting approach to transform the reliability of the graph into the probability that subgraphs have a certain connectivity. We also extend an approximation algorithm of Karger from the All-Terminal Unreliability to k-edge connected Unreliability and study the k-edge connected Reliability for some special graph classes, namely graphs with restricted treewidth, edge-transitive graphs and the complete graph.:1 Introduction 2 Monotone Systems 2.1 Monotone Binary Systems 2.2 Monotone Multistate Systems 3 Graphs and Graph Operations 4 Higher Connectivity 4.1 Connectivity Number and Edge-Connectivity Number 4.2 Algorithms 5 Essential and Irrelevant Edges 6 Probabilistic Graphs and Reliability Measures 7 Reductions 8 Splitting 8.1 Some Special Cases for Small Separators/Cuts 8.2 Generalization to Arbitrary Separators 8.3 Constructing the Splitting Classes for 2-ec, 3-ec and 2-vc 8.4 Minimality 8.5 A Lattice-based Approach 9 An Approximation Scheme 9.1 Definition of Approximation Algorithms 9.2 The FPRAS for All-Terminal-Unreliability 9.3 Improved Bound for the Number of alpha-cuts 9.4 Extension to k-edge-connected Unreliability 10 Special Graph Classes 10.1 Graphs with Bounded Treewidth 10.2 Edge-Transitive Graphs 10.3 The Complete Graph 11 Future Research 12 Summary