NTT DoCoMo

About: NTT DoCoMo is a based out in . It is known for research contribution in the topics: Base station & Mobile station. The organization has 4032 authors who have published 8655 publications receiving 160533 citations.

The road to IMT-advanced communication systems: State-of-the- art and innovation areas addressed by the WINNER + project

Abstract: Phases I and II of the WINNER project contributed to the development, integration, and assessment of new mobile network techniques from 2004 to 2007. Some of these techniques are now in the 3GPP LTE and IEEE 802.16 (WiMAX) standards, while others are under consideration for LTE-Advanced and 802.16m. The WINNER+ project continues this forwardlooking work for IMT-advanced technologies and their evolution, with a particular focus on 3GPP LTE-advanced. This article provides an overview of the WINNER system concept and several of its key innovative components.

Base station and handover control method

Abstract: Embodiments of the present invention make it possible to reduce loss and delay of downlink user data transmitted at regular time intervals in a mobile communication system employing a hard handover method, and make it possible to easily perform high-quality handover solely by a handover-starting base station. A base station for transmitting downlink user data at regular time intervals to a mobile station is disclosed. The base station is configured to transmit a handover-command signal immediately after transmitting the downlink user data to the mobile station.

Method and apparatus for controlling display of windows

Abstract: In a mobile phone 1, in a state in which multiple windows are being displayed in a display 107, when an operation to change the size of any of the windows is performed, whether it is possible to display each window in the display 107 without overlapping after the change is determined. When it is not possible to display each window in the display 107 without overlapping, the mobile phone 1 minimizes, of the windows other than the window whose size was changed, the window with the largest number of size changes. Thus, when the number of windows is large, a window with low priority to the user is minimized.

Policy Evolution in Distributed Usage Control

Abstract: Usage control is a generalization of access control that also addresses how data is handled after it is released. Controlling the future usage of data includes controlling the future distribution of data. The evolution of policies upon re-distribution must hence be defined. Intuitively, clients should only strengthen policies associated with a data item when they re-distribute it. We provide a role-based re-distribution model for usage control that encompasses strengthening both rights and duties. By introducing orderings for events and parameter values we show how both rights and duties can be strengthened with the traditional abstraction of trace inclusion.