Mitsubishi Denki Kabushiki Kaisha

Telefonaktiebolaget Lm Ericsson (publ)

Sony Corporation

Mitsubishi Electric Corporation

Hideshi Murai

Yasuhiro Yano

Nicolas Voyer

Hisao Tachika

Takeshi Matsumura

Toshikane Oda

Takeo Suzuki

Kazushi Yamamoto

Nicolas c/o Mitsubishi Elec Info Tech Center Europe Voyer

A Femto base station which is arranged to connect to a wireless communication network and to generate a first cell for providing a wireless communication service to at least one user equipment existing within a coverage area of the first cell, comprising a transceiver comprising a transmitter and a receiver for the wireless communication with the user equipment and a controller, wherein the controller determines whether the Femto base station has entered an energy-saving mode or not, the controller disables the operation of the transmitter when it is determined that the base station has entered the energy-saving mode, and when the receiver detects a data transmission from the user equipment to a macro base station after disabling the operation of the transmitter, the controller reconfigures the transmitter. The macro base station generates a second cell with a broader coverage than the first cell and including the first cell.

Femto base station, energy-saving coordination node, wireless communication system and computer program

A composite signal including a plurality of component signal streams is processed using QR-decomposition to detect symbols and calculate a decision metric for each of the signal streams (). Soft serial interference cancellation is performed on the composite signal based on the symbols detected for different ones of the signal streams and a ranking of the signal streams (). The symbols are re-detected and the decision metric re-calculated for each signal stream based on soft serial interference cancellation results (). The different decision metric calculations for at least one of the signal streams are compared to determine whether symbol detection is more accurate with or without soft serial interference cancellation (). The signal streams are decoded using symbols detected based on soft serial interference cancellation results when symbol detection is determined to be more accurate with soft serial interference cancellation (). Otherwise, the streams are decoded based on the symbols detected using QR-decomposition ().

Multi-antenna receiver interference cancellation method and apparatus

In a compressed mode, a spread spectrum communication device interleaves bit units across multiple frames using an interleaver, reduces the spreading factor using a framing/spreading unit, outputs the compressed mode frames at a predetermined compressed mode frame timing, and increases the average transmission power in the compressed mode at a radio frequency transmitter. Furthermore, a handover between different frequencies is carried out by establishing synchronization to another frequency carrier, based on a first search code and a second search code which have been detected, and moreover, a handover between different communication systems is carried out by establishing synchronization to a GSM, based on an FCCH and a SCH which have been detected.

Spread spectrum communication device and spread spectrum communication method

In the mobile radio communication system where the UMTS and an another system coexist an idle slot for observing the frequency component of another system is inserted in one superframe of UMTS. The duration of this idle slot is at most half of the duration of one frame that form the superframe and it is inserted at an interval of a specified number of frames. Therefore, the frequency component of the another system can be observed securely from the UMTS. Further, the deterioration of interleaving performance of the compressed mode frames during such observation can be suppressed.

Mobile radio communication system, communication appartus applied in a mobile radio communication system, and mobile radio communication method

A communication method applied to a mobile station in a code division multiple access system transmitting uncompressed frames and compressed frames, the method including: receiving transmission power control information indicating an increase or decrease in power and a compressed frame including a transmission gap from a base station; adjusting transmission power on the uncompressed and the compressed frames in accordance with the transmission power control information, by increasing or decreasing current power with a first power control step size for the uncompressed frames, and with a plurality of power control step sizes for the compressed frames, the plurality including at least one power control step size larger than the first power control step size; and transmitting the uncompressed and the compressed frames in accordance with the adjusted transmission power, wherein the transmission gap included in the compressed frame transmitted from the base station is used to observe other frequency carrier.

Mobile radio communication system, communication apparatus applied in mobile radio communication system, and mobile radio communication method

In the mobile radio communication system where the UMTS and an another system coexist an idle slot for observing the frequency component of another system is inserted in one superframe of UMTS. The duration of this idle slot is at most half of the duration of one frame that form the superframe and it is inserted at an interval of a specified number of frames. Therefore, the frequency component of the another system can be observed securely from the UMTS. Further, deterioration of interleaving performance of the compressed mode frames during such observation can be suppressed.

Growing community of inventors

Tokyo, Japan

Hideshi Murai