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.

CREST: An Opportunistic Forwarding Protocol Based on Conditional Residual Time

Abstract: Opportunistic forwarding protocols take advantage of contact opportunities to route data in intermittently connected environments. In these environments, a fully connected path between the source and destination may not always exist and the contact schedules of all the nodes are not known in advance. Hence, one of the key challenges for a node is to make effective forwarding decisions using only a limited knowledge of the contact behavior of the nodes in the network. Based on an analysis of human mobility traces that we collected from our office environment, we introduce a new link metric, conditional residual time, that accurately estimates the time remaining for a pair of nodes to meet using only the local knowledge of their past contacts. We then propose a distributed protocol called CREST, that uses the conditional residual time to opportunistically forward messages between pairs of nodes. Experimental results show that CREST has a lower end-to-end delay compared to protocols that depend on future contact schedules and global knowledge of the contact behavior across the network. Furthermore, by disseminating only a few additional copies of the message, the delivery ratio of CREST improves significantly and is comparable to that of the flooding protocol.

Method for providing at least one personalized web user page

Abstract: Zu Beginn einer Internet-Sitzung erzeugt ein auf dem Personal Computer (70) eines Benutzers implementierter Browser die vom Provider erstellte Startseite. Die Startseite ist mehr oder weniger vom Provider voreingestellt und berucksichtigt das Zugriffsverhalten des Benutzers wahrend einer Internet-Sitzung nicht. Der Erfindung liegt daher die Aufgabe zugrunde, ein Verfahren sowie einen Computer-lesbaren Datentrager mit einem darauf gespeicherten Computerprogramm bereitzustellen, welches personalisierte Web-Benutzerseiten erzeugen kann. Hierzu wird zunachst zu Beginn einer Internet-Sitzung eine Web-Startseite auf das Web-taugliche Endgerat (70) geladen. Der Benutzer gibt anschliesend wenigstens einen Suchbegriff und/oder eine bestimmte Zieladresse zu einer bestimmten Webseite ein. Wurde ein Suchbegriff eingegeben, so werden zu diesem die entsprechenden Zieladressen erzeugt. Alle Zieladressen werden nachher in einem Benutzer-bezogenen Speicher (100, 120, 130) abgelegt. Anschliesend wird wenigstens eine personalisierte Web-Benutzerseite aus den gespeicherten Zieladressen, die in Abhangigkeit von wenigstens einem vorbestimmten Kriterium ausgewahlt werden, erstellt. Diese personalisierte Web-Benutzerseite wird Benutzer-gesteuert oder automatisch an dessen Endgerat dargestellt. Nach Beendigung der Sitzung wird die aktuelle personalisierte Web-Benutzerseite in dem oder einem anderen Benutzer-bezogenen Speicher (130) zur Weiterverwendung abgelegt.

Group coordination and negotiation through spatial proximity regions around mobile devices on augmented tabletops

Abstract: Negotiation and coordination of activities involving a number of people can be a difficult and time-consuming process, even when all participants are collocated. We propose the use of spatial proximity regions around mobile devices on a table to significantly reduce the effort of proposing and exploring content within a group of collocated people. In order to determine the location of devices on ordinary tables, we developed a tracking mechanism for a camera-projector system that uses dynamic visual markers displayed on the screen of a device. We evaluated our spatial proximity region based approach using a photo-sharing application for people sat around a table. The tabletop provides a frame of reference in which the spatial arrangement of devices signals the coordination state to the users. The results from the study indicate that the proposed approach facilitates coordination in several ways, for example, by allowing for simultaneous user activity and by reducing the effort required to achieve a common goal. Our approach reduced the task completion time by 43% and was rated as superior in comparison to other established techniques.

Reordering of Packets due to Multipath Forwarding - An Analysis

Abstract: Increased parallelism in routers necessary to handle high link speeds and large routing tables, wireless ad hoc routing, QoS provisioning, and overlay routing, are some of the factors that lead to an increase in reordering on the Internet. Packet reordering due to packet forwarding over multiple paths is investigated. An analytical model is derived for load splitting scenarios and verified using emulated topologies. The resulting reordering is profiled using reorder density, and analyzed with respect to path delays, path probabilities and number of paths. The variation of packet displacement with delay variation and forwarding probabilities is quantified. The special case corresponding to two paths is evaluated in detail. For any load splitting, the increase in the difference in the delay between paths leads to increased reordering, making the paths with closer delay values more preferable. The model can also be applied to a single-path case where reordering is caused by wide delay variation among packets, by deriving an equivalent set of probabilities corresponding to path splitting scenario.

Method, system, access point and computer program product for enhancing the usable bandwidth between of a telecommunications network and a user equipment

Abstract: The invention is related to a method for enhancing the usable bandwidth between on the one hand an access point of a radio access network of a telecommunications network, and on the other hand a User Equipment of a subscriber of the telecommunications network, wherein the User Equipment and the access point mutually communicate based on a standardized mobile communication technology using carrier aggregation of at least a first communication carrier and a second communication carrier, wherein the first communication carrier has a first carrier frequency and wherein the second communication carrier has a second carrier frequency, wherein the first carrier frequency is a standardized and licensed frequency and related to the communication technology, and wherein the second carrier frequency is a frequency in a frequency range out of the following: - from 6.765 to 6.795 MHz, - from 13.553 to 13.567 MHz, - from 26.957 to 27.283 MHz, - from 40.66 to 40.70 MHz, - from 433.05 to 434.79 MHz, - from 902 to 928 MHz, - from 2.400 to 2.500 GHz, - from 5.725 to 5.875 GHz, - from 24.00 GHz to 24.25 GHz, - from 61.0 GHz to 61.5 GHz, - from 122 GHz to 123 GHz and - from 244 GHz to 246 GHz.