Panasonic Corporation

Optis Wireless Technology, LLC

Keisuke Ebiko

Jinsong Duan

Atsushi Sumasu

Mitsuru Uesugi

Ryohei Kimura

Keiji Takakusaki

Toyoki Ue

Akito Fukui

Eiji Ota

A mobile communication system wherein the upstream radio channel interference of a macrocell connection terminal with a femtocell base station can be reduced while the consumption of radio resources caused by increase in signaling is being suppressed. The macrocell connection terminal () performs, based on an instruction from a macrocell base station (), an upstream channel transmission and further reports a peripheral-femtocell detection result obtained by a measuring unit to the macrocell base station. The macrocell base station () instructs the terminal to perform a peripheral-femtocell detection. The identifier of the terminal and the peripheral-femtocell detection result obtained by the terminal are transmitted to a network management apparatus (). An interference reduction instruction (frequency band allocation) and the identifier of the terminal to be interference-controlled are received from the network management apparatus, and the frequency band allocation in the upstream channel transmission of the terminal to be interference-controlled is so controlled as to satisfy the interference reduction instruction.

Mobile communication system, network management apparatus, macrocell base station apparatus, and interference control method

A radio communication apparatus and an associated method are provided. The apparatus includes a receiving unit configured to receive first data and second data, which are transmitted from a plurality of antennas for spatial-multiplexing using a plurality of blocks, into which a plurality of consecutive subcarriers in a frequency domain are divided. The apparatus further includes a calculating unit configured to calculate a first absolute CQI value per each of the blocks for the first data and a second absolute CQI value per each of the blocks for the second data, and calculate a relative value of the second absolute CQI value with respect to the first absolute CQI value, per each of the blocks. The apparatus still further includes a transmitting unit configured to transmit the first absolute CQI value and the relative value of the second absolute CQI value in the same block.

Radio communication apparatus and radio communication method

Provided are a base station device and a transmission power control method that reduce interference with an uplink radio channel from a femto-connected terminal to a macrocell base station while avoiding an increase in signaling. A measurement unit () measures the macrocell signal reception level, and a propagation loss estimating unit () estimates propagation loss between a HUE and a HNB based on the HUE signal reception power, for example. A judgment unit () performs a first comparison of the macrocell signal reception level with a first threshold value and a second comparison of the propagation loss with a second threshold value, and an adjustment unit () generates a command to reduce the maximum value that is possible for the target control value for the HNB total reception power when the macrocell signal reception level is at least the first threshold value and the propagation loss is at least the second threshold value. A scheduler () determined a transmission rate allocated to the HUE based on the HUE signal and the maximum value that is possible for the target control value for the HNB total reception power.

Radio communication base station device and transmission power control method

A transmitting apparatus, a receiving apparatus and a wireless communication method for suppressing interference between codes, while further reducing the ratio of redundant components occupying a signal to improve the transmission efficiency. The transmitting apparatus () transmits a signal having a frame structure in which a plurality of symbols follow a pilot symbol to which a guard interval has been added. In the receiving apparatus () that receives that signal, a long FFT target section acquiring part () acquires, from the received OFDM signal, a long FFT target section that is a target section in which delay waves are to be removed by use of a pilot symbol. A long FFT part () performs a fast Fourier transformation of the long FFT target section to convert it to a frequency domain signal. A frequency equalizing part () performs a frequency equalization of the long FFT target section by use of an interpolation result of communication line estimation value. A long IFFT part () performs an inverse fast Fourier transformation of the long FFT target section as frequency equalized to convert it back to a time domain signal.

Transmitting apparatus, receiving apparatus, and wireless communication method

A mobile terminal device for performing multi-carrier communication with a base station device can improve communication quality while reducing the data amount without lowering accuracy of feedback information. In the mobile station device (), a reception level measuring unit () measuring SINR as a reception level for each chunk formed by a plurality of sub-carriers according to a known signal; a control information transmission control unit () transmits feedback information (CQI information) based on the communication quality of each chunk to a base station device (); a relative value calculation unit () calculates a relative value of MCS corresponding to the reception level between adjacent chunks from the reception level of each chunk; and a CQI information generation unit () generates feedback information (CQI information) from an absolute value of MCS corresponding to the reception level of the reference chunk and a relative value of MCS corresponding to the reception level between the adjacent chunks.

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Kanagawa, Japan

Keisuke Ebiko