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.

Network-based mobility management in the evolved 3GPP core network

Abstract: A key aspect of the 3GPP system architecture evolution is the specification of an evolved packet core that supports multiple access networks The EPC enables operators to deploy and operate one common packet core network for 3GPP radio accesses (E-UTRAN, UTRAN, and GERAN), as well as other wireless and wireline access networks (eg, eHRPD, WLAN, WIMAX, and DSL/Cable), providing the operator with a common set of services and capabilities across the networks A key requirement of the EPC is to provide seamless mobility at the IP layer as the user moves within and between accesses This article provides an overview of the EPC specifications that use a network-based mobility mechanism based on Proxy Mobile IPv6 to enable mobility between access networks An important facet of providing seamless mobility for a user's sessions across technologies is to ensure that quality of service is maintained as the user moves between accesses An overview of the "off-path" QoS model to supplement PMIPv6 is also provided

Mobile terminal, access control management device, and access control management method

Abstract: A mobile terminal (200) includes: an application execution unit (240); an access control rule management unit (270) for holding an access control rule for defining presence/absence of the access authority to a confidential resource in the terminal by an application program and decision means; an access control rule query unit (220) for specifying an identifier of a user identification module owned by the mobile terminal or an identifier of the mobile terminal itself, acquiring the access control rule from an external device, and storing the it in the access control rule management unit; a query required/non-required judgment unit (260) for calling the access control rule query unit when the application program accesses a confidential resource and judging whether to update the access control rule; an authority management unit (230) for judging presence/absence of the access authority according to the access control rule; and a confidential resource management unit (250) for permitting on not permitting the request to access the confidential resource by the application program according to the authority management unit (230).

MobiSurf: improving co-located collaboration through integrating mobile devices and interactive surfaces

Abstract: One of the most popular scenarios for advertising interactive surfaces in the home is their support for solving co-located collaborative tasks. Examples include joint planning of events (e.g., holidays) or deciding on a shared purchase (e.g., a present for a common friend). However, this usually implies that all interactions with information happen on the common display. This is in contrast to the current practices to use personal devices and further, most people's behavior to constantly switch between individual and group phases because people have differing search strategies, preferences, etc. We therefore investigated how the combination of personal devices and a simple way of exchanging information between these devices and an interactive surface changes the way people solve collaborative tasks compared to an existing approach of using personal devices. Our study results clearly indicate that the combination of personal and a shared device allows users to fluently switch between individual and group work phases and users take advantage of both device classes.

Measured path loss and multipath propagation characteristics in UHF and microwave frequency bands for urban mobile communications

Abstract: This paper presents the frequency dependence of propagation loss and multipath propagation characteristics for urban mobile communications based on measurement results in Japanese urban areas. Path loss in reference frequencies from 457.2 MHz to 15.45 GHz increases according to the free space propagation power law in terms of frequency dependence for both macrocell and microcell environments. The standard deviation of each frequency band exhibits similar values. Wide-band propagation measurements show analogous characteristics among frequency bands from 3 to 15 GHz in urban multipath propagation. These measurement results show that the dominant difference among frequencies is found in only free space characteristics in terms of frequency dependence from the UHF to microwave frequency bands.

Network topology configuring method and node

Abstract: A node includes a manager configured to manage the hash value of the node and the hash values of adjacent nodes, and a calculator configured to calculate an insertion position of a new entry node in a ring network, based on the hash value of the new entry node, the hash value of the node and the hash values of the adjacent nodes.