Hitachi, Ltd.

Hiatchi, Ltd.

Masataka Ohta

Toshiro Suzuki

Mikiya Namura

Hiroyuki Minemura

Hiroaki Ono

Hisataka Sugiyama

Takeshi Ishizaki

Naoya Ikeda

Masatoshi Takihiro

Shuji Ohno

Akinori Shiozawa

A mobile communication system which includes an exchange, a plurality of base stations, and a plurality of radio telephone sets communicatable with the associated base stations. In order to suppress or reduce call loss caused by traffic congestion or by faulty one of the base stations, an uncommunicatable service area of the faulty base station is covered by the other working base stations. The exchange detects operation states of all the base stations, searches a base-station state pattern table within the exchange for base-station control data suitable for the operation states to read out the base-station control pattern, and transmits the read-out base-station control data to the base stations to cause radio service areas of the base stations to be set to have desired radiation patterns according to the read-out base-station control data.

Integrated control system for radio service areas of base stations in mobile communication system

An optical disc apparatus including a system controller that receives a recording control command via an interface. A recording control block that receives a recording method command signal indicative of one of recording with verify and real time recording and recording data from the system controller. An optical head that modulates the power of laser beam using a recording pulse sent from the control block and records the recording data on an information recording medium. The recording data is recorded in the information recording medium according to the recording with verify and the real time recording using different recording power respectively, in which under the recording with verify, the recording power determined by recording compensation learning is used, and under the real time recording, the recording power higher than the recording power obtained by the recording compensation learning is used.

Optical disc apparatus and information recording apparatus using the optical disc apparatus

A user terminal sends a resource reservation request message in which time information indicative of time to perform a communication is designated to a switching node to which the self user terminal is linked. The switching node manages a reservation state of each of resources which can be used by the self switching node among resources of a network together with time information indicative of time when a communication using the resource is performed. When the resource reservation request message is received, an unreserved resource is obtained at a time indicated by the time information designated in the resource reservation request message, the obtained resource is reserved, and a resource reservation result notice message indicative of the reservation result is returned to the user terminal. A resource management server is also provided so as to reserve a network resource with a simple operation. The reservation can be performed in consideration of priority and cost of a communication. Reservation information can be always recognized by a client. When resource reservation is failed, an alternative plan is automatically calculated and presented.

Network and switching node in which resource can be reserved

Integrated control system for radio service areas of base stations in

Growing community of inventors

Machida, Japan

Masataka Ohta