Fujitsu Corporation

Hitachi, Ltd.

Cleanup Corporation

Keizo Watanabe

Hiroshi Sato

Hajime Hasegawa

Isao Sakama

Minoru Ashizawa

Masanori Takagi

Hiromu Matsuzawa

Satoshi Makino

Hideto Watabe

Yoshinori Momose

Masahisa Kujiraoka

In a radio mobile communication system adopting a hierarchical cell structure comprising a plurality of layers having respective cells of different sizes, the threshold value of the number of times of cell reselections and/or the threshold value of the time required to measure the number of times of cell reselections are set for each layer. A mobile station device compares the number of times of cell reselections in a specific time and/or the time required for the number of times of cell reselections to reach a specific value with the threshold values and selects a transfer target cell.

Cell selection method, mobile station device and mobile communication system in hierarchical cell structure

A frequency allocation method in a base station communicating wirelessly with a terminal, for dividing a cell into six areas in a clockwise direction, and allocating a frequency to each of the divided sectors, including: dividing the cell into an outer circle and an inner circle; allocating to a first terminal positioned in the outer circle of the sector, a frequency different from a frequency allocated to a second terminal positioned in an adjacent sector of the same cell, and the frequency different from a frequency allocated to a third terminal positioned in the outer circle of an adjacent sector of the adjacent cell; and allocating the frequency allocated to the first terminal to fourth and fifth terminal positioned in the inner circle of two sectors respectively arranged two sectors away from the sector in which the first terminal is positioned.

Frequency allocation method in wireless base station apparatus and wireless base station apparatus

A wireless IC tag includes an IC chip with a response circuit for receiving a signal sent from an interrogator and transmitting a response signal in response to the received signal, a rectangular antenna connected to the response circuit, a first protective material hard in nature for covering the IC chip, and a second protective material, softer than the first protective material, for covering at least a part of the antenna, and the antenna is formed in a laminated structure of a plurality of flat members different in toughness so as not to fracture even when the antenna is bent by external forces.

Method for manufacturing radio frequency IC tag and antenna

A communication format control method is used in a mobile communication system which is capable of providing a communication service to a mobile station in each zone via a plurality of base stations by a simplex or duplex communication format. The communication format control method includes a step of call-connecting a calling mobile station which calls by a simplex communication request and a called mobile station by a duplex communication format, when the calling mobile station is located in a zone different from a zone in which the called mobile station is located.

Communication format control method and apparatus

Channel switching control in a mobile telecommunication system of a multiple zone configuration provided with base stations of zones for engaging in radio communication with mobile stations and base station control equipment for controlling the base stations, wherein the base station control equipment performs priority processing on a request for channel switching due to deterioration of quality, in which there is little margin of time until the quality of service deteriorates below a predetermined level, when receiving a request for channel switching to a stronger field transferred from a mobile station through a base station and a request for channel switching due to deterioration of quality from a base station, thereby enabling channel switching able to ensure a predetermined quality of service.

Channel switching control in mobile telecommunication system

An electric locker apparatus with a plurality of locker boxes each having an electric lock device including a latch member normally maintained by a stopper member in a lock position in engagement with the door of the box, and biased toward an unlock position wherein the door can be opened, and an actuator responsive to electric command signal, with an output member movable into an operative position for allowing the latch member to be released from the stopper member and moved into the unlock position. The apparatus further includes an emergency unlocking device for forcibly moving the output member of the actuator into the operative position without requiring input of the command signal. The unlocking device has an emergent key cylinder into which an emergent key can be inserted from outside. The angular motion of the key is converted into a linear motion of the output member of the actuator toward the operative position.

Growing community of inventors

Kawasaki, Japan

Keizo Watanabe