Matsushita Electric Industrial Co., Ltd.

Panasonic Corporation

Matsushita Electrical Industrial Co., Ltd.

Matshushita Electric Industrial Co., Ltd.

Inventergy, Inc.

Kazuyuki Miya

Katsuhiko Hiramatsu

Masaki Hayashi

Takashi Kitade

Osamu Kato

Makoto Sasaki

Masatoshi Watanabe

Mitsuru Uesugi

Toyoki Ue

Kenichi Miyoshi

Masayuki Hoshino

Hideki Kanemoto

Takenobu Arima

Hidenori Kayama

Hiroyuki Kanaya

Toshiyuki Uehara

Izumi Horikawa

Junichi Aizawa

Hideyuki Takahashi

Norihito Kinoshita

Satoshi Imaizumi

Akinori Tatsumi

Roland Go

Atsushi Iwaoka

Hidetoshi Suzuki

Takahisa Aoyama

Daisuke Yamada

Keiji Takakusaki

Taku Nagase

Kouichi Honma

Hideki Yukitomo

Takayuki Nakano

Hitoshi Iochi

Makis Kasapidis

Keiichi Kitagawa

Katsuhiko Hlramatsu

The transmission apparatus according to the present invention includes a switching device that switches the multiplexing destination of mask symbols and uses this switching device to switch the multiplexing destination of the mask symbols so that the mask symbols multiplexed with control channel signals transmitted in parallel from a plurality of antennas may be transmitted from only one antenna at each transmission timing.

Transmission apparatus and base station apparatus using the same

A mobile station apparatus in a CDMA/TDD mobile communication system employs a communication frame including a plurality of time slots. The time slots include a plurality of forward link time slots, disposed at regular intervals in the communication frame and assigned a common control channel. The time slots further include time slots other than the plurality of forward link time slots, divided into reverse link time slots and forward link time slots according to an amount of information on a forward link and on a reverse link. The mobile station apparatus includes a receiver that receives the communication frame including the plurality of time slots. A measurer measures individual reception qualities of the plurality of forward link time slots in the received communication frame including the forward link time slots assigned the common control channel. A weighter assigns a weight to each measured reception quality of the plurality of forward time slots. A transmission power controller performs transmission power control for reverse link time slots according to individual reception qualities of weighted forward link time slots.

CDMA/TDD mobile communication system and method

In the CDMA Radio Multiplex Transmission, transfer function of line is inferred by using common pilot signal and synchronous detection is performed accordingly. The transmitting end transmits by periodically inserting pilot symbols into one channel only of multiplexed channels. The receiving end infers line condition (transfer function) from the received pilot symbols and, on the basis of the information thus obtained, performs synchronous detection of each channel multiplexed.

CDMA radio multiplex transmitting device and a CDMA radio multiplex receiving device

A base station apparatus in a CDMA/TDD mobile communication system is provided. A signal is formed employing a frame configuration with a plurality of time slots and spreading processing utilizes a long spreading code for identifying a cell and a short spreading code for acquiring frame synchronization. The base station apparatus includes a first control channel former that forms a first control channel including a symbol that is spread by a first short spreading code. A second control channel former forms a second control channel including a symbol spread by a second short spreading code and positioned at a same timing as the symbol spread by the first short spreading code.

Base station apparatus, mobile station apparatus, transmission method and receiving method in a CDMA/TDD mobile communication system

The CM controlleroutputs times at which signals are sent to various communication terminal apparatuses in a compressed mode based on information on the compressed mode sent from a host station such as a control station apparatus to the schedulercoderand modulator. The schedulerdecides times (order) at which packet data is sent to the respective communication terminal apparatuses based on priority information such as channel conditions and times at which signals are sent in the compressed mode and outputs schedule information indicating the times for creating this packet data to the switch circuitThe switch circuitoutputs the packet data to be sent to the communication terminal apparatuses sequentially to the coderaccording to the schedule created by the scheduler

Scheduling creation apparatus, base station apparatus, and radio communication method

A radio communication apparatus, base station apparatus and communication terminal apparatus capable of predicting an accurate transmission rate before starting data communications to know download time and the like. In the apparatus, a packet CH demodulation section () demodulates received packet data. A pilot CH demodulation section () demodulates a received signal of a pilot channel. A reception state measuring section () measures the SIR from the received signal of the pilot channel. A transmission rate candidate selecting section () stores a calculation expression that associates CQI with SIR, and selects CQI by the calculation expression using the measured SIR. A transmission rate predicting section () averages selected CQI for a predetermined time to output a transmission rate prediction value. A transmission rate prediction control section () outputs information of the transmission rate prediction value to a display section () when detecting a key input. The display section () displays the transmission rate prediction value on a liquid crystal screen.

Radio communication apparatus, base station apparatus, communication terminal apparatus and transmission rate predicting method

Transmission diversity and adaptive array antenna transmission is executed with respect to a user to which a shared channel is assigned, or a pilot channel is shared a like a shared channel. By this means it is made possible to secure a large number of users without code resource shortages even where adaptive array antenna is applied to a shared channel.

Wireless base station apparatus and wireless communication method

A transmission rate determining method that enables assignment of transmission rate (modulation scheme and coding rate) to be optimized with high accuracy in the AMC technique. In the method, in a base station, Doppler frequency detectordetects the Doppler frequency (moving speed) of each mobile station. MCS assignment sectioncorrects a relational expression of MCS (coding rate and modulation scheme) and CIR based on the Doppler frequency (moving speed) obtained in Doppler frequency detector, for example, corrects a threshold in CIR, and determines MCS optimal for CIR report value. Results of assignment in MCS assignment sectionare output to coding sectionand modulation section

Radio communication apparatus and transfer rate decision method

A base station apparatus (radio transmission apparatus) transmits a radio signal of data to a mobile terminal apparatus (communication apparatus of a transmission destination). The mobile terminal apparatus receiving the radio signal determines (ST) information (CQI) on a downlink transmission rate enabling reception in the mobile terminal apparatus based on reception quality such as CIR to transmit to the base station apparatus. The base station apparatus extracts a CQI value from the received radio signal, while obtaining likelihood of received data (ST), and corrects the CQI value based on the likelihood (ST). Then, based on the corrected CQI value, the base station apparatus determines a downlink transmission rate (ST). By this means, even when the radio transmission apparatus erroneously receives the transmission rate request transmitted from the communication apparatus of the transmission destination, the communication apparatus is prevented from erroneously receiving the data transmitted from the radio transmission apparatus.

Radio transmission device and transmission rate decision method

Error detection sectioncarries out error detection using demodulated data and outputs an error rate to SIR versus error rate estimation section. SIR versus error rate estimation sectionestimates an SIR versus error rate and outputs the result of decision as to whether the correction of the target SIR value is necessary or not to target SIR correction section. Target SIR correction sectioncorrects the target SIR value based on the decision result. The information on the demodulation capability of a BTS is output to G parameter control sectionand G parameter control sectiondetermines an optimal gain factor. A G parameter indicating the determined gain factor is output to multiplexing sectionof the BTS. The G parameter is output to SIR versus error rate estimation section. This makes it possible to perform communications with an optimal gain factor and target SIR during diversity handover between base stations with and without an interference canceller or between base stations with interference cancellers of different capabilities.

Radio infrastructure apparatus

In a receiving side apparatusreception quality of receive data is measured by a reception quality measurement sectionreceive data errors are detected by an error detection sectionand when an error is detected a retransmission request signal and reception quality signal are transmitted multiplexed with transmit data by a transmit frame creation sectionIn a transmitting side apparatuswhen a retransmission request signal is received a capacity necessary for demodulating data in a receiving side apparatusis detected from a reception quality signal by a scheduling sectionand data is retransmitted at that capacity. By this means it is possible to reduce the number of data retransmissions during transmission and reception, and to improve transmission efficiency.

System and method for regulating data transmission in accordance with a receiver's expected demodulation capacity

An antennareceives signals orthogonal to each other transmitted from different antennas of a base station, and a despreaderand a spreaderdespread the respective received signals using the same spreading code used in the base station, a demodulatorand a demodulatordemodulate the despread signals, a reception power measuring sectionand a reception power measuring sectionmeasure reception power from the demodulation results, a reception power combinercombines measured reception power, and a transmission power controllercontrols transmission power based on combined reception power. This makes it possible to perform open loop transmission power control at high speed and with high accuracy even when a fading variation is small.

Communication terminal, base station system, and method of controlling transmission power

Symbolthat is spread with the only short spreading code and inserted in synchronism with a long spreading code is specified by detecting the correlation with only the short spreading code. Next, another short spreading code indicative of a timing of reverse and forward link switching is specified, where the short spreading code is multiplexed at the same position as that of the detected symbol. The detection of the symbols spread with only these spreading codes enables to acquire synchronization of the long spreading code, synchronization of switching of reverse and forward links, and synchronization of a transmission frame. It is thereby possible to reduce synchronization acquisition time for the long spreading and an easy planning of base station locations without decreasing the frequency utilization efficiency.

Radio communication apparatus and radio communication method

A radio base station apparatus may include two diversity antennas spaced apart by a distance that allows space diversity, with each diversity antenna functioning as an adaptive array antenna. Each diversity antenna has a corresponding transmitter that includes a calculator that calculates a transmission weight from one of (i) a reception weight determined based on an uplink signal and (ii) direction of arrival information. Each transmitter also has a multiplier that multiplies only a transmission signal for a channel to a specific user by the transmission weight. Also, each transmitter has a transmit power controller that controls the transmit power of the transmission signal, multiplied by the transmission weight, in accordance with a transmit power control signal.

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Kawasaki, Japan

Kazuyuki Miya