Ntt Docomo, Inc.

Ntt Mobile Communications Network, Inc.

Yozan Corporation

Nec Corporation

Other

Fujitsu Corporation

Denso Corporation

Agency for Science, Technology and Research

Mamoru Sawahashi

Kenichi Higuchi

Yoshihisa Kishiyama

Nobuhiko Miki

Hiroyuki Atarashi

Motohiro Tanno

Fumiyuki Adachi

Teruo Kawamura

Sadayuki Abeta

Noriyuki Maeda

Hidekazu Taoka

Yoshiaki Ofuji

Satoshi Nagata

Akihito Morimoto

Changming Zhou

Tomohiro Dohi

Guoliang Shou

Makoto Yamamoto

Sunao Takatori

Hiroyuki Kawai

Koji Ohno

Xuping Zhou

Toshifumi Sato

Junichiro Kawamoto

Yukihiko Okumura

Seizo Onoe

Akihiro Higashi

Koichi Okawa

Yukiko Hanada

Shinji Uebayashi

Daisuke Nishikawa

Yoshinori Miki

Shingo Suwa

Lan Chen

Shousei Yoshida

Yoshihiro Ishikawa

Yoshikazu Goto

Hidehiro Andou

Syunsuke Seo

Hiroyuki Ishii

Kazuaki Takeda

Takahiro Asai

Anil Umesh

Minami Ishii

Yuichi Kakishima

Yoshikazu Kakura

Hiroyuki Seki

Narumi Umeda

Zhongding Lei

Atsushi Harada

Keisuke Saito

Norifumi Kamiya

Masayuki Kimata

Takumi Ito

Hidehiro Ando

Takehiro Ikeda

Shinya Tanaka

Kunihiko Suzuki

Tetsuro Imai

Yong Bai

Ying-Chang Liang

Francois Po Shin Chin

Jingxiu Liu

Jie Chen

Xiaoming Dai

Zhengang Pan

Xiaoming Peng

Xiaoling Qin

Taisuke Ihara

Yoshihisa Kishyama

Satoru Fukumoto

Takashi Kataoka

Yoshihisa Kiskiyama

A base station for transmitting a synchronization signal from N transmission antennas (N&#x3e;=2) in orthogonal frequency division multiple access includes a signal sequence generation unit configured to generate a synchronization signal sequence to be used for the synchronization signal in a frequency domain; a subcarrier mapping unit configured to divide a transmission band of the synchronization signal into K frequency blocks (K&#x3e;=2) and map the synchronization signal sequence into one or more subcarriers in the K frequency blocks; a precoding unit configured to generate N precoding vectors to be multiplied by the synchronization signal sequence in the frequency domain and multiply the synchronization signal sequence to be transmitted from an n-th antenna (1&#x3c;=n&#x3c;=N) by at least an n-th precoding vector; and a transmission unit configured to transmit the synchronization signal from the N transmission antennas.

Base station, synchronization signal transmission method, and user equipment terminal, and cell search method

The object is achieved by providing a base station apparatus for performing time and frequency scheduling in uplink packet access with: an interference amount measurement part configured to measure an uplink interference amount for each interference amount measurement unit which comprises a predetermined period and a predetermined number of frequency blocks; an interference amount determination part configured to determine whether the uplink interference amount satisfies a predetermined condition; and an overload indicator reporting part configured to report an overload indicator to a neighboring cell when the predetermined condition is satisfied.

Base station apparatus and communication control method

To provide a radio base station apparatus and radio communication method capable of performing radio communications using downlink reference signal structures suitable for antenna virtualization, a radio base station apparatus () has a plurality of transmission antennas, generates CRSs used in demodulation of at least downlink control information, CQI-RSs generated for each of the transmission antennas used in measurement of channel quality, and DM-RSs generated for each stream used in demodulation of downlink transmission data, and multiplexes the CRSs, CQI-RSs and DM-RSs into a same transmission time unit to transmit from each of the antennas.

Radio base station apparatus, mobile station apparatus and radio communication method

A modulation device includes a mapping circuit configured to map information bits to signal points on a plurality of concentric rings, when a signal space arrangement in which the number of signal points on all of the plurality of rings is the same is used as a basis, reduce the number of signal points on an innermost ring or a plurality of rings from inner to outer rings from among the plurality of rings, generate a new ring outside the signal space arrangement used as the basis, and arrange, on the generated ring, signal points which achieve the same frequency utilization efficiency as that of the signal space arrangement used as the basis.

Modulation method, decoding method, modulation device, and demodulation device

A base station apparatus is used in a mobile communication system in which at least a shared data channel is transmitted by an orthogonal modulation scheme using an I-channel and a Q-channel. The base station apparatus includes a providing unit providing Acknowledgement/Non-Acknowledgement information indicating whether retransmission of a signal received in uplink is required; a mapping unit mapping a number of multiplexed users of the Acknowledgement/Non-Acknowledgement information to the I-channel or the Q-channel based on a predetermined mapping table; and a reporting unit reporting the Acknowledgement/Non-Acknowledgement information to the respective users. The mapping table indicates that, when the number of the multiplexed users is equal to or less than a predetermined number, the Acknowledgement/Non-Acknowledgement information is associated with the I-channel or the Q-channel, and otherwise, the Acknowledgement/Non-Acknowledgement information is associated with the I-channel and the Q-channel.

Mobile communication system, base station apparatus, user equipment, and method

A radio base station that communicates with a user terminal, and has a control section that executes control so that signals are time-division-multiplexed over a first radio resource region where symbols are multiplexed at a rate equal to or below a Nyquist rate and a second radio resource region where symbols are multiplexed at a faster rate than the Nyquist rate. The radio base station also includes a transmission section that transmits the signals that are time-division-multiplexed in the first radio resource region and the second radio resource region, to the user terminal to reduce the interference against predetermined signals in a radio communication system in which Faster-Than-Nyquist (FTN) is used.

Radio base station, user terminal and radio communication method

A mobile communications system having a first base station and one or more second base stations is disclosed, wherein the first base station includes a first generator which generates a first known signal for use in common between the first base station and the second base station and a second known signal use specific to each of the first base station and the second base station, and a radio transmitter which wirelessly transmits, to a subordinate terminal apparatus, the first known signal and the second known signal which are generated by the first generator.

Radio communications system, base station, user apparatus, and method

A transmission apparatus is provided with radio resource assignment means that assigns radio resources to each physical channel according to a type of the physical channel; and transmission means that transmits information to be transmitted by each physical channel using the assigned radio resources.

Transmission apparatus and radio resource assignment method

To improve the frequency diversity effect and enhance reception quality characteristics in a mobile terminal apparatus even when the system bandwidth is extended, provided are a base station apparatus which maps transmission data to each user to a single or plurality of group bands among group bands configured by dividing a system band into a plurality of bands, and transmits the mapped transmission data on downlink, and a mobile terminal apparatus which receives the transmission data mapped to the group bands and demaps the transmission data.

Base station apparatus, mobile terminal apparatus, and information transmission method

Transmitting apparatus and radio resource assignment method

A base station apparatus in a radio communication system where transmit diversity is applied in uplinks includes a reference signal measurement unit configured to measure a receive level of the reference signal, a switch pitch determination unit configured to determine the antenna switch pitch of transmitting the reference signal based on the receive level measured by the reference signal measurement unit, and a transmitting unit configured to transmit the antenna switch pitch determined by the switch pitch determination unit.

Base station apparatus, user apparatus and communication control method

In a radio communication system, a downlink frequency band includes a plurality of frequency blocks including one or more carrier frequencies, and one or more frequency blocks are used for data transmission to a single user. A radio communication apparatus for use in the communication system has an evaluation unit evaluating the quality of a received signal for each frequency block and storing plurality of stored quality evaluations of the received signal, a comparison unit comparing the plural quality evaluations of the received signal, and a transmission unit transmitting a predetermined number of the quality evaluations of the received signal over an uplink control channel.

Radio communication apparatus and method

A communication terminal in a multi-carrier system using a frequency bandwidth including a plurality of resource blocks, each of the resource blocks including one or more sub-carriers. The communication terminal includes a receiving unit configured to receive a signal in which a control channel is multiplexed into a single radio frame based on a number of control channels allocated into the single radio frame to use a lower coding rate by repeating transmitting without changing encoding method in which a channel other than the control channel is multiplexed in accordance with scheduling information for allocating one or more of the plurality of resource blocks to the communication terminal and a processing unit configured to perform a process on the signal received by the receiving unit.

Base station and transmission method

Growing community of inventors

Yokohama, Japan

Mamoru Sawahashi