Nec Corporation

Nara Machinery Co., Ltd.

Masato Shindo

Sadafuku Hayashi

Yoshio Ueda

Yohei Kawaguchi

Hidetoshi Iwamatsu

Hideumi Hosobe

A mobile communication system according to the present invention is a mobile communication system including base stations each of which forms a cell and transmits MBMS data to a mobile station existing in the cell, and control stations each of which controls the base station connected thereto, wherein the control stations include at least a control station and a second control station that determines a frequency and timing for transmitting the MBMS data in the cell and instructs the first control station of the determined frequency and timing, and wherein each of the first and second control stations establishes time synchronization with another control station and instructs the connected base station to set the cell to the frequency determined by the second control station and transmits the MBMS data to the connected base station in accordance with the transmission timing determined by the second control station.

Mobile communication system, control station, base station, communication method and program

A mobile communication system of the present invention is a mobile communication system including a mobile station, base stations each of which forms a cell and transmits MBMS data to the mobile station existing in the cell, control stations each of which controls a base station connected thereto, and further including a core network node that instructs each of the control stations connected thereto with respect to the frequency and timing for transmitting MBMS data in the cell, wherein each of the control stations establishes time synchronization with another control station and instructs the connected base station to set the cell to the frequency designated by the core network node and transmits, to the connected base station, the MBMS data in accordance with the transmission timing designated by the core network node and the mobile station then receives the MBMS data.

Mobile communication system, core network node, control station, base station, communication method and program

A control apparatus () is configured to automatically update a neighbour relation table () of a source cell (A). The control apparatus () is further configured to add, to the neighbour relation table (), a new entry () indicating a neighbour-cell relation from the source cell (A) to another cell (B) different from both the source cell (A) and a target cell (C) of a handover from the source cell (A), in response to receiving a first message (S) that is issued when a radio terminal () that has experienced a failure involving disconnection of a radio link connection in the source cell (A) or in the target cell (C) attempts to re-establish the radio link connection to the other cell (B). This contributes to updating the neighbour-cell relations in response to detection of a handover failure.

Control apparatus, base station apparatus, radio terminal, and method for updating neighbour relation table

In order to change control over a user equipment within a femtocell in accordance with a change in camping of the user equipment, a communication system includes a femto base station () that provides a femtocell includes notification destination setting means () for setting, in the femto base station (), a notification destination to be notified of a change in camping of a user equipment () on the femtocell. The femto base station () notifies the set notification destination of the change in camping of the user equipment (), upon detection of the change in camping.

Communication system, information processing device and femto base station therein, method and program for controlling the same, and method of transmitting information to femto base station

A processing apparatus operates aiming to realize handover to each mobile station while reducing a failure rate of the handover even when PSC Confusion is generated. More specifically, when a connection of the mobile station is switched from a first base station to a second base station, the processing apparatus determines the second base station by selecting from a plurality of base stations according to connection history information indicating a success or a failure of past switching of the connection from the first base station to at least one of the plurality of base stations.

Processing apparatus, mobile communication system, base station apparatus, method for switching connection of mobile station, and non-transitory computer readable medium storing program

A sieving apparatus includes first and second sieving portions. The first sieving portion includes a sieve with a plurality of elongated holes or slits for separation of an object to be sieved based on difference in cross-sectional diameter. The second sieving portion with a sieve constituted by a porous plate includes round holes for separation of the object that has passed through the elongated holes or slits based on difference in aspect ratio. The second sieving portion is employed after sieving by the first sieving portion. A diameter of the round holes in the porous plate constituting the sieve included in the second sieving portion is longer than an opening width in a shorter direction of the elongated hole or the slit of the sieve included in the first sieving portion.

Sieving apparatus and sieving method

Provided are a mobile communication system, a base station, a communication method and a program whereby respective cells can be changed to an energy saving cell or a Compensation Cell, while minimizing the occurrence of interference. The mobile communication system according to the present invention has a base station () having a cell (), and a base station () having a cell (). Furthermore, the base station () according to the present invention sends first information indicating that preparations for change of the cell () to an energy saving state have been completed, to the base station ().

Mobile communication system, base station, communication method and non-transitory computer-readable medium storing program

A mobile communication system includes a radio base stations and further includes a determination unit for determining, on the basis of attribute information of the radio base stations, whether to establish a logical interface between the radio base stations. Since it is arranged that the determination unit determines, on the basis of attribute information of the radio base stations, whether to establish a logical interface between the radio base stations, the establishment of unnecessary logical interface (i.e., logical interface for which the necessity of maintenance is low) can be suppressed.

Radio base station, server, mobile communication system, and operation control method

Communication system, information processing device and femto base station therein, method and program for controlling the sames, and method of transmitting information to femto base station

Provided is an HNB gateway device capable of, while in an operation in a sleep mode, deactivating function units other than functions units associated with a mode check message and a sleep mode release request message from another HNB-GW, and thereby enabling a power saving operation. An HNB gateway device () includes a function to obtain a usage rate of the HNB gateway device, relays signals between a switching center and an HNB, and transits to a sleep mode when the usage rate reaches or falls below a predetermined value. The HNB gateway device includes means (HNB-GW list management unit) for changing, upon transition to the sleep mode, an HNB gateway list in the HNB performing HNB registration on the HNB gateway device using RPC:SetParameterValues from an HMS.

Growing community of inventors

Tokyo, Japan

Masato Shindo