Matsushita Electric Industrial Co., Ltd.

Matshushita Electric Industrial Co., Ltd.

Takashi Kitade

Kazuyuki Miya

Masaki Hayashi

Katsuhiko Hiramatsu

Osamu Kato

Mitsuru Uesugi

Toyoki Ue

Hidenori Kayama

Taku Nagase

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

A propagation loss measuring sectionappropriately changes a measuring method according to the reception type of system informed from a base station so as to measure propagation losses. A propagation loss comparatorcompares the propagation loss between the respective cells. A transmission slot controllercontrols a data assembling sectionand spreaderin such a way to transmit a signal to a base station existing in a cell with a smaller propagation loss. A transmission power controllercontrols a RF sectionin such a way to transmit a signal with a transmission power value obtained by adding the propagation loss value at each cell to a target reception power value at each base station.

Mobile station apparatus and transmission power control method

Despreading sectionextracts a common control channel signal from each base station by performing despreading processing on a baseband signal from RF sectionusing a predetermined spreading code. Propagation loss measuring sectionmeasures a propagation loss for each base station using the reception level of the common control channel signal and the transmission level of this common control channel signal. Propagation loss comparatordetects a base station whose propagation loss is a minimum from among all base stations. Transmission data control sectioncontrols the timing of transmission data in the data composition section so that an dedicated traffic channel signal is transmitted to the detected base station and controls the spreading code in spreading section

Apparatus and method for TDMA-TDD based transmission/reception

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

The base station apparatus compresses one-frame information of a broadcast channel to blocks of &frac12; of one frame or less and repeatedly sends this block in a one-frame time. The mobile station apparatus decodes the received signal in block units or added block units to carry out error detection. The mobile station apparatus receives and adds up the next block in the case that the error rate exceeds a threshold. The mobile station apparatus repeats this until the error rate falls below the threshold. When the error rate falls below the threshold, the mobile station apparatus stops reception of broadcast channel signals and uses the rest of time until a one-frame time elapses to monitor carrier information of a different mobile communication system for handover.

Mobile station apparatus and base station apparatus

The base station apparatus according to the present invention places pilot data and transmission power control data independently of each other in a slot based on processing delays and propagation delays required for transmission power control and places slots by providing an offset for the slot locational relationship between the uplink and downlink.

Base station apparatus and transmission power control method

The present invention carries out transmission/reception of broadcast channels using only the last downlink slot of subframes using signals having a TDMA structure according to a CDMA/TDD system, and thus flexibly handles various services and avoids problems of interference in self-operated services in particular. The base station communication apparatus repeatedly transmits information contained in broadcast channels by the number of times corresponding to the time-sharing number and appropriately allots uplink and downlink slots, thus making the most of the features of uplink open-loop transmission power control and base station transmission diversity.

Communication terminal apparatus, base station communication apparatus and radio communication method

Spreading sections and of the base station spread the respective distributed data using mutually orthogonal spreading codes and they are transmitted from antennas and . Despreading sections and of the mobile station despread the received signals using the same spreading codes as those used at the base station, demodulation sections and demodulate the despread signals, received signal power measuring sections and measure their received signal powers from the demodulation result, received signal power measuring section combines the measured received signal powers and transmit power control section controls transmission power based on the combined received signal power. When carrying out diversity reception through a plurality of antennas at the base station, this suppresses transmit power control errors to a small level at the mobile station.

Diversity method

Spreading sections of the base station spread the respective distributed data using mutually orthogonal spreading codes and are transmitted from antennas. Despreading sections of the mobile station despread the received signals using the same spreading codes as those used at the base station. Demodulation sections demodulate the despread signals. Received signal power measuring sections measure their received signal powers from the demodulation result. A received signal power combination section combines the measured received signal powers and a transmit power control section controls transmission power based on the combined received signal power. When carrying out diversity reception through a plurality of antennas at the base station, transmit power control errors are suppressed to a small level at the mobile station.

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Yokosuka, Japan

Takashi Kitade