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.

Analysis of the Reliability of a Nationwide Short Message Service

Abstract: SMS has been arguably the most popular wireless data service for cellular networks. Due to its ubiquitous availability and universal support by mobile handsets and cellular carriers, it is also being considered for emergency notification and other mission-critical applications. Despite its increased popularity, the reliability of SMS service in real-world operational networks has received little study so far. In this work, we investigate the reliability of SMS by analyzing traces collected from a nationwide cellular network over a period of three weeks. Although the SMS service incorporates a number of reliability mechanisms such as delivery acknowledgement and multiple retries, our study shows that its reliability is not as good as we expected. For example the message delivery failure ratio is as high as 5.1% during normal operation conditions. We also analyze the performance of the service under stressful conditions, and in particular during a "flash-crowd" event that occurred in New Year's Eve of 2005. Two important factors that adversely affect reliability of SMS are also examined: bulk message delivery that may induce network-wide congestion, and the topological structure of the social network formed by SMS users, which may facilitate quick propagation of viruses or other malware.

Elastic network functions: opportunities and challenges

Abstract: Network function virtualization (NFV) and software defined networking (SDN) are key technology enablers for cost reductions and new business models in networking. The possibility to automatically and dynamically scale network services at run time is one of the main claims of NFV. Elastic NFV could be similar to what elastic cloud services provide for compute, with pay-per-use cost models for customers. However, control of resources for elastic services is far from trivial. We show how current NFV and SDN architectures could support elastic resource services for network functions (NFs). We reveal that the current NFV architecture does not allow recursive resource orchestration, therefore preventing resource scaling requests from being handled by a resource orchestrator overseeing the entire domain where an NF is executed. We introduce a logical centralization of joint compute and network resource orchestration as a UNIFY framework, which enables direct control of elastic resources for the NFs. We show opportunities and challenges associated with such an architecture.

Evolution of Internet Address Space Deaggregation: Myths and Reality

Abstract: Internet routing table size growth and BGP update churn are two prominent Internet scaling issues. There is widespread belief in a high and fast growing number of ASs that deaggregate prefixes, e.g., due to multi-homing and for the purpose of traffic engineering. Moreover, researchers often blame specific classes of ASs for generating a disproportionate amount of BGP updates. Our primary objective is to challenge such widespread assumptions (“myths”) and not solely to confirm previous findings. Surprisingly, we find severe discrepancies between existing myths and reality. According to our results, there is no trend towards more aggressive prefix deaggregation or traffic engineering over time. With respect to update dynamics, we observe that deaggregated prefixes generally do not generate a disproportionate number of BGP updates, with respect to their share of the BGP routing table. On the other side, we observe much more widespread traffic engineering in the form of AS path prepending and scoped advertisements compared to previous studies. Overall, our work gives a far more positive picture compared to the alarming discourses typically heard: The impact of “bad guys” on routing table size growth and BGP churn has not changed for the worse in recent years. Rather, it increases at the same pace as the Internet itself.

The Technology Radar - an Instrument of Technology Intelligence and Innovation Strategy

Abstract: This paper analyzes the establishment of a technology intelligence tool of the Deutsche Telekom Laboratories - the Technology Radar. Goals and method are contrasted to approaches discussed in literature. After the presentation of exemplary findings of the Technology Radar, the role of the Technology Radar within the innovation and technology management of the Deutsche Telekom is being discussed. The paper closes with lessons learned, key success factors are being highlighted and recommendations for the introduction of technology intelligence systems are given.

Transport monitoring system

Abstract: A transport monitoring system is provided for transporting goods that are provided with identification tags. The identification tags store identification data used to identify the goods. The transport device includes a closeable transport unit, at least one reader unit, an evaluation unit and activation unit. The closeable transport unit receives goods that are provided with identification tags. The at least one reader unit emits an inquiry signal to the transport unit in order to read the identification tags when an activation signal for activating the reader unit is received. The at least one reader unit also receives the identification data signals emitted by the identification tags. The evaluation unit is used to evaluate the identification data signals received by the reader unit. The activation unit produces the activating signal for activating the reader unit once the transport unit is closed.