Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Naohito Tomoe

Masayuki Nakazawa

Kuniyuki Suzuki

Syouhei Suyama

Mitsuru Mochizuki

Koji Ono

Takayuki Nonami

Takashi Kashiwagi

Fumiki Hasegawa

Taisei Suemitsu

Hideki Igarashi

A base station device is configured to set, for each communication terminal device, a radio format for signals transmitted to and received from the communication terminal device. The radio format is set for each communication terminal device in accordance with, for example, a type of use including a moving speed of the communication terminal device. The base station device may be configured to change the radio format for the communication terminal device based on the information about a change in the environment of a radio communication between the communication terminal device and the base station device and a change including the communication terminal device's location. The signals transmitted and received between the base station device and the communication terminal device include radio formats in which at least one of a length of a symbol of the signal and a length of a cyclic prefix in an OFDM scheme differs.

Communication system, base station, and communication terminal for controlling interference from neighboring cells

Communication system

When carrying out a downlink handover, a source base transceiver station from which a mobile node is moving receives packets to be transmitted, via a wireless section, to the mobile node from an IP network, and copies and transfers them to a destination base transceiver station to which the mobile node is moving. On the other hand, when carrying out an uplink handover, the source base transceiver station compares the reliability of transport blocks which are received via a wireless section, from the mobile node and which are demodulated and decoded by the local station with that of transport blocks which are received via an IP network, from another base transceiver station and which are demodulated and decoded thereby, packetizes selected transport blocks with a better quality, and transmits them to a communications-partner node according to a route table, thereby implementing distribution of traffic via the IP network.

Base transceiver station apparatus and mobile communications system

In a mobile communications system in which a mobile station is capable of communicating simultaneously with a plurality of base stations, the resources of the plurality of base stations are managed under the control of the mobile station. For example, the mobile station specifies a resource to a base station with a resource specifying signal, the mobile station specifies a resource to a base station with a resource specifying signal, and the mobile station specifies a resource to a base station with a resource specifying signal.

Mobile communications system, mobile station and base station

Radio base station device and mobile communication system

An interference wave detecting device comprises a transmitter for converting data to be transmitted from a base station into a radio signal of a predetermined transmission frequency, and for transmitting the radio signal to a mobile station by way of a transmitting antenna, a receiving unit for receiving either of a radio signal lying within a certain reception band of frequencies including a predetermined reception frequency from the mobile station and an interference wave signal lying within a certain transmission band of frequencies including the predetermined transmission frequency, and a controlling unit for causing the transmitting unit to stop transmitting the radio signal of the predetermined transmission frequency in order to detect the interference wave signal, and for enabling the receiving unit to receive the interference wave signal only within a period of time during which the transmitting unit stops transmitting the radio signal of the predetermined transmission frequency to the mobile station.

Device for and method of detecting interference waves

A diversity receiver includes: a differential detection diversity reception circuit for performing a diversity reception with employment of a differential detection to thereby output hard decision data thereof; a least-squares combining diversity reception circuit for performing a least-squares combining diversity reception to thereby output differentially decoded result of the hard decision data; a selection control circuit for producing a selection control signal used to select one of the hard decision data outputted from the differential detection diversity reception circuit and the differentially decoded result outputted from the least-squares combining diversity reception circuit based upon a predetermined selection basis; and a selection circuit for selecting one of the hard decision data and the differentially decoded result based upon the selection control signal.

Diversity receiver

Gain control method and receiver

A superheterodyne receiver is provided in which first and second envelope detectors having a function of regulating the gain and offset voltage are used to detect receive signal levels from first and second intermediate frequency signals. These receive signal levels are compensated with respect to a phase difference through a phase difference compensating circuit. The compensated signals are then summed by an adder to provide a receive signal level detection output.

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Tokyo, Japan

Naohito Tomoe