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.

Method and apparatus for dynamic replacement of device drivers in the operating system (OS) kernel

Abstract: A method and apparatus for dynamic replacement of device drivers in the operating system (OS) kernel are described. In one embodiment, the method comprising receiving a request to add a device driver to an operating system and dynamically adding the device driver to the operating system while user application and operating system processes are being performed.

Multiuser resource allocation maximizing the perceived quality

Abstract: Multiuser resource allocation for time/frequency slotted wireless communication systems is addressed. A framework for application driven cross-layer optimization (CLO) between the application (APP) layer and medium access control (MAC) layer is developed. The objective is to maximize the user-perceived quality by jointly optimizing the rate of the information bitstream served by the APP layer and the adaptive resource assignment on the MAC layer. Assuming adaptive transmission with long-term channel state information at the transmitter (CSIT), we present a novel CLO algorithm that substantially reduces the amount of parameters to be exchanged between optimizer and layers. The proposed CLO framework supports user priorities where premium users perceive a superior service quality and have a higher chance to be served than ordinary users.

A language framework and infrastructure for safe and composable applications

Abstract: A method and apparatus is disclosed herein for using a language framework for composable programs. In one embodiment, the method comprises accessing active content having a software component embedded therein, where the software component has a plurality of components that together implement a work flow of a sequence of activities, the plurality of components representing one or more external services, one or more user interface controls and one or more inputs and output; executing the software component, including mediating communication between components using an information flow-based security model.

Skin Temperature Elevation for Incident Power Densities From Dipole Arrays at 28 Ghz

Abstract: The relationship between skin temperature elevation and incident power density (IPD) from radio-frequency near-field exposure at 28 GHz for different angles of incidence is evaluated computationally in this study. The averaging scheme of the IPD is crucial for determining the maximum allowable exposure levels of wireless equipment to comply with certain standards/regulations. However, it is still unclear which component of the IPD (i.e., the norm or normal component to the human body) is more related the temperature elevation. In the case of four-element dipole arrays, the distances between the model and the antenna were 15 and 30 mm in transverse-electric- and transverse-magnetic-like polarized waves, respectively, and in the case of eight-element dipole arrays, the distances were 45 mm from the center of the array. From our computational results for four- and eight-element dipole arrays, we confirmed that the normal component of the IPD provides better correlation with the surface skin temperature, regardless of angle of incidence, particularly for smaller angles of incidence (<30°). The enhancement of the ratio of the temperature increase to IPD was observed around the Brewster’s angle, which is mainly attributable to the difference in transmittance at the body surface. This exposure scenario may not occur as the antenna–human distance was too large to consider compliance at the closest distance. In terms of output power, the most restrictive condition for compliance is shown to be normal incidence, suggesting the importance of compliance for such exposure scenarios. Furthermore, the absorbed power density proved to be an appropriate metric to monitor in relation to skin temperature elevation.

Transmitter, transmitting method, receiver, and receiving method for MC-CDMA communication system

Abstract: A reception step receives a multicarrier signal containing subcarriers, at least one of which a synchronization signal is transmitted therein, multiplied only by a synchronization signal spreading code, a correlation detection step detects correlation values between the received multicarrier signal and replicas of the synchronization signal, and a timing detection step detects a FFT timing and a long code received timing according to the correlation values.