Ntt Docomo, Inc.

Nec Corporation

Fujitsu Corporation

Denso Corporation

Agency for Science, Technology and Research

Nit Docomo, Inc.

Yoshihisa Kishiyama

Mamoru Sawahashi

Kenichi Higuchi

Satoshi Nagata

Kazuaki Takeda

Motohiro Tanno

Nobuhiko Miki

Teruo Kawamura

Anass Benjebbour

Tetsushi Abe

Hiroyuki Ishii

Daisuke Nishikawa

Yuichi Kakishima

Kazuki Takeda

Hidekazu Taoka

Akihito Morimoto

Hiroki Harada

Sadayuki Abeta

Hiroyuki Atarashi

Yoshiaki Ofuji

Lan Chen

Hideaki Takahashi

Tooru Uchino

Liu Liu

Toshifumi Sato

Yousuke Sano

Yusuke Ohwatari

Yuuya Saitou

Takehiro Nakamura

Qin Mu

Yukihiko Okumura

Seizo Onoe

Shimpei Yasukawa

Yuta Sagae

Xiaoming She

Kohei Kiyoshima

Naoto Ookubo

Kiichi Tateishi

Benjebbour Anass

Mikio Iwamura

Anil Umesh

Lihui Wang

Hiroyuki Seki

Wei Liu

Chongning Na

Tsuyoshi Shimomura

Zhongding Lei

Daiki Takeda

Dai Kimura

Keisuke Saito

Wenbo Wang

Naoto Okubo

Xiang Yun

Katsutoshi Kusume

Jianchi Zhu

Wei Xi

Daisuke Kurita

Francois Po Shin Chin

Jian Zhao

Masashi Iwabuchi

The present invention is designed to realize appropriate communication in next generation communication systems. a control section that controls communication by using a radio frame that includes a plurality of transmission time intervals (TTIs), in which the downlink and the uplink can be switched, and a given TTI, which is for DL transmission and which is configured in a given cycle, and a receiving section that receives a synchronization signal and a broadcast signal in the given TTI are provided.

Terminal, communication method, base station, and system for receiving synchronization and/or broadcast signals in a given transmission time interval

The present invention is designed to reduce the time it takes to form adequate beams, in communication using beamforming. According to one aspect of the present invention, a user terminal has a receiving section that, using temporally orthogonal radio resources, forms receiving beams and receives reference signals that are transmitted in different transmitting beams respectively, a measurement section that performs measurements based on the reference signals, and a control section that controls the forming of the receiving beams so that at least one of the reference signal is received in a given period set.

User terminal, radio base station and radio communication method

A user apparatus is provided. The user apparatus performs communications with a base station. The user apparatus includes a receiving unit configured to receive a downlink pilot signal, a downlink control signal, and downlink user data by using a subframe that includes a pilot signal area, to which the downlink pilot signal is mapped, a control signal area, to which the downlink control signal is mapped, a user data area, to which the downlink user data is mapped, and a multiple use area, to which an uplink signal or a downlink signal is mapped; and a transmission unit configured to map the uplink signal to the multiple use area and transmit the mapped result to the base station in the case where information is included in the downlink control signal indicating that the uplink signal is to be mapped to the multiple use area.

User apparatus and base station

A radio communication system includes a first radio base station having multiple antenna elements, and user equipment, wherein, for initial connection of the user equipment to the first radio base station, the first radio base station applies different precoding vectors to a downlink user common signal transmitted to all users located in or near a serving area of the first radio base station, and transmits the downlink user common signal while changing the applied precoding vector; wherein the user equipment selects a desired one of the precoding vectors applied to the downlink user common signal, and reports a selection result to the first radio base station, and wherein the first radio base station precodes a data signal addressed to the user equipment using the selected precoding vector and transmits the precoded data signal to the user equipment.

Radio communication system and radio base station apparatus

A terminal is disclosed that includes a receiver that receives higher layer signaling that indicates a periodic time period in which uplink transmission is not performed and a processor that monitors downlink control information for scheduling system information in the time period. In other aspects, a radio communication method and a base station are disclosed.

Terminal, radio communication method for a terminal, and base station

The present invention is designed to communicate using a radio interface with improved scalability in the frequency domain. According to the present invention, a user terminal includes a receiving section that receives a downlink control signal including information about the assignment of a downlink data signal and receives the downlink data signal based on the downlink control signal, and a transmission section that transmits an uplink control signal including transmission acknowledgment information in response to the downlink data signal. Further, a plurality of frequency domain units constituting the entire frequency band as a block are formed. The downlink control signal, the downlink data signal and the uplink control signal are time-division-multiplexed in the same frequency domain unit.

In user equipment for communicating with a base station in a radio communication system including the base station and the user equipment, the user equipment includes a receiver that measures received power of reference signals associated with a plurality of different identification information items, the reference signals being transmitted from the base station, and that selects a specific reference signal based on a measurement result; and a transmitter that transmits a random access signal including a preamble sequence, the preamble sequence corresponding to the identification information item of the reference signal selected by the receiver.

User equipment, base station, communication access method, and communication method

A radio communication method for a user terminal performing communication in a cell where DL transmission and UL transmission vary in a time direction is provided. The radio communication method includes receiving downlink control information transmitted in a specific subframe; and analyzing a number and/or positions of subframes to be allocated for the DL transmission among subframes constituting a radio frame based on DL assignment in the downlink control information.

Communication control method, radio communication system, radio base station and user terminal

Provided are a receiver, a transmitter and a radio communication method capable of using non-orthogonal multiple access while suppressing cost increase and processing delay. A mobile stationA includes a target user control signal detectorand an interfering user control signal detectorwhich are configured to receive a control signal to be used to cancel a non-orthogonal signal by interference canceller. The control signal includes control information containing a radio resource block allocated to the non-orthogonal signal addressed to another mobile station. The mobile stationA demodulates and cancels the radio signal addressed to the other mobile station on the basis of the control signal.

Receiver, transmitter and radio communication method

To perform appropriate AMC control even if low latency is required. A transmission apparatus includes: a reception section that receives channel quality information communicated between the transmission apparatus and a reception apparatus; a control section that determines one or more first candidates for a value indicating a coding and modulation scheme based on the channel quality information, determines one or more second candidates for a value indicating the coding and modulation scheme based on a parameter related to service quality required for a service communicated between the transmission apparatus and the reception apparatus, and selects a value included in both of the first candidates and the second candidates; and a transmission section that transmits transmission data using the coding and modulation scheme corresponding to the selected value.

Transmission apparatus, reception apparatus, and communication method

It is one of the objects to achieve an appropriate communication in a next generation communication system. The user terminal according to one aspect of the present invention includes a receiving section that receives a synchronization signal and a transmitting section that uses a sequence and/or a radio resource determined based on the synchronization signal to transmit a random access preamble.

User terminal, radio base station, and radio communication method

The present invention is designed to allow adequate communication in a next generation communication system in which a plurality of numerologies are introduced. A control section that controls communication using at least one of a plurality of numerologies with different subcarrier spacings, and a receiving section that receives information related to numerology for use in communication are provided, and the plurality of numerologies with different subcarrier spacings are configured that one of the length of a transmission time interval (TTI) and the number of symbols per TTI is different.

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

A radio base station making it possible to perform efficient scheduling of user terminals by reducing feedback information to be received from the user terminals is provided. A radio base station includes a position-related-information obtaining section configured to obtain position-related information indicating positional relationships among multiple user terminals. In addition, the radio base station includes a scheduler configured to determine user groups of the user terminals to be spatially multiplexed in the same time and frequency resources based on the position-related information obtained by the position-related-information obtaining section.

Radio base station

A user apparatus is disclosed herein that includes a receiver configured to receive a plurality of synchronization signals and a transmitter configured to transmit a sounding reference signal associated with a specific synchronization signal of the plurality of synchronization signals. The transmitter also maps the sounding reference signal to consecutive OFDM symbols in one slot.

User apparatus and signal transmission method for mapping sounding reference signals

Growing community of inventors

Tokyo, Japan

Yoshihisa Kishiyama