Deutsche Telekom

About: Deutsche Telekom is a company organization based out in Welwyn Garden City, United Kingdom. It is known for research contribution in the topics: Telecommunications network & Signal. The organization has 3473 authors who have published 5208 publications receiving 65429 citations. The organization is also known as: DTAG & German Telecom.

Joint Base-Station Association, Channel Assignment, Beamforming and Power Control in Heterogeneous Networks

Abstract: Heterogeneous cellular networks (HetNets), where low-power base-stations are overlaid with conventional macro base-stations, is a promising technique to improve coverage and capacity of the macro-only networks. To realize the potential benefits of HetNets, it is crucial to jointly optimize the user association, channel assignment, beamforming and power control to ensure that the inter- and intra-cell interference will not overwhelm the cell-splitting gains. This paper presents an iterative algorithm to solve the joint optimization problem with an objective of maximizing the network sum rate and simultaneously guaranteeing the individual user quality-of-service. The proposed algorithm is built on the so-called convex-concave procedure, and the feasibility issue is handled by L1-norm heuristic. Numerical results demonstrate the large gains over currently used methods for cellular networks.

Position Paper: Software-Defined Network Service Chaining

Abstract: Network service chaining allows composing services out of multiple service functions. Traditional network service functions include, e.g., firewalls, TCP optimizers, web proxies, or higher layer applications. Network service chaining requires flexible service function deployment models. Related work facilitating service chaining include, e.g., the network service header proposal discussed at the IETF or the complementary work on network function virtualization (NFV) at ETSI. This position paper presents a high-level concept and architecture to enable service chaining using Software Defined Networking (SDN), specifically OpenFlow in a telecommunication environment. The paper discusses required functionalities, challenges, and testbed aspects to implement and test such an approach. Finally, the set of implemented service functions and management interfaces are highlighted to demonstrate the approach as a proof of concept for a selection of relevant use cases.

System for detection of mobile applications network behavior-netwise

Abstract: The invention is a system for protecting mobile devices in cellular networks from unauthorized harmful applications and for protecting cellular network infrastructure from targeted or benign overloads. The system comprises mobile cellular devices and a cellular network infrastructure. Some of the mobile devices comprise an application manager, which is adapted to manage the aggregation and learning processes, and a detection manager, which is adapted to analyze network behavior and detect deviations. The application manager and the detection manager are adapted to monitor the applications running on a device, learn the patterns of mobile applications network behavior and detect meaningful deviations from the application's observed normal behavior. The cellular network infrastructure comprises a services module, a logic module, and a database access unit adapted for aggregation and analysis of an application's network traffic patterns for numerous users.

Public key encryption and digital signatures based on permutation polynomials

Abstract: Permutation polynomials over Zn form the basis of the RSA and Dickson public key schemes. Previously, however, only those permutation polynomials whose inverse permutation polynomial was easy to evaluate have been used in cryptography. The authors propose a way to avoid this restriction in public key cryptography by implementing secret key decryption and signature generation by computation of the gcd of two polynomials. This allows the implementation of new classes of public key scheme.