Canon Kabushiki Kaisha

Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Sony Corporation

Yasuhiro Yano

Hideshi Murai

Nicolas Voyer

Masahiro Haruta

Tokuya Ohta

Hirokazu Komuro

Tsuyoshi Eida

Masao Sugata

Shinichi Hirasawa

Tatsuo Masaki, Deceased

Yohji Matsufuji

Ichiro Endo

Hajime Kobayashi

Hiroshi Sugitani

Hiroshi Kubo

Yoshifumi Hattori

Isao Kimura

Toshitami Hara

Yasushi Takatori

Katsuyuki Motoyoshi

Takao Muramatsu

Yoji Matsufuji

Kazushi Yamamoto

Hideshi c/o Mitsubishi Denki Kabushiki Kaisha Murai

Nicolas c/o Mitsubishi Elec Info Tech Center Europe Voyer

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.

A communication apparatus includes a grouping controlling unit hierarchically groups frequency channels so that the number of channels included in a group of a layer becomes smaller than the number of channels included in a group of a layer immediately above; and a propagation path information estimating unit that estimates propagation path information of the channels. The apparatus also includes an average value calculating unit that calculates an average value of the propagation path information for each group in a highest layer with the estimate values, and calculates the estimate values used in each layer based on an average value of a layer immediately above to calculate an average value of the propagation path information for each group in other layers with the estimate values of the each layer; and a feedback unit that feeds back an average value acquired in each group as feedback information.

Communication apparatus and radio communication system

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.

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

Growing community of inventors

Tokyo, Japan

Yasuhiro Yano