Mitsubishi Electric Corporation

Ricoh Company, Ltd.

Richoh Company, Ltd.

Mitsubishi Electric R&d Centre Europe B.v.

Fumihiro Hasegawa

Akinori Taira

Akihiro Okazaki

Mitsuru Mochizuki

Hiroshi Nishimoto

Noriyuki Fukui

Tadahiro Shimoda

Yukinaka Uchiyama

Masatsugu Higashinaka

Shinichi Sumiyoshi

Toshio Miyazawa

Shigeru Uchida

Hitoshi Itoh

Hiroki Iura

Tomomi Ishimi

Cheng Du

Koichi Inoue

Miyuki Oda

Wenhui Xu

Shinji Aoki

Junichi Hara

Masayuki Nakazawa

Shigenori Tani

Hideaki Yamagata

Shinji Yamakawa

Hiroyasu Sano

Cristina Ciochina

Michiyoshi Tachikawa

Masahiko Itoh

Takayuki Kunieda

Toshifumi Yamaai

Tetsuo Yamashita

Yuka Kihara

Nobuyoshi Horie

Daichi Uchino

Masao Oga

Cristina Ciochina-Duchesne

Hiroaki Nagatsuka

Yoshihisa Kagawa

Yuusuke Ohta

Mitsuyoshi Mineyama

Keiichi Isono

Provided is a communication system with low latency and high reliability, etc. Even after transitioning from RRC_CONNECTED to RRC_INACTIVE, a communication terminal device maintains secondary base station configuration information on configuring a secondary base station. Even when at least one of a master base station and a secondary base station is changed during the RRC_INACTIVE, the communication terminal device maintains the secondary base station configuration information. The communication terminal device again transitions to the RRC_CONNECTED using the maintained secondary base station configuration information.

User apparatus, base station and communication system

A position management server being a first position management server in a radio communication system that includes the first position management server to hold first position information indicating a position of a mobile object measured by a first method, and a second position management server to hold second position information indicating the position of the mobile object measured by a second method, includes: a storage unit that holds the first position information; a communication unit that receives the second position information from the second position management server, and transmits the first position information to the second position management server; and a control unit that generates third position information indicating the position of the mobile object by using the second position information and the first position information, and causes the third position information to be held in the storage unit.

Position management server, radio communication system, control circuit, storage medium, and mobile object position managing method

A wireless communication device includes a transmission processing unit communicable with each of multiple communication peer devices through switching between beam directions in a time division manner, and a control unit that allows beam information representing how beams are used by the multiple communication peer devices with which the transmission processing unit is communicable to be shared by the multiple communication peer devices.

Wireless communication device, wireless communication system, control circuit, storage medium, and wireless communication method

A communication system includes a user apparatus; and base stations respectively configured to wirelessly communicate with the user apparatus. The base stations include a master base station and a secondary base station that configure dual connectivity for the user apparatus. The secondary base station is configured with a grant configuration related to transmission without grant in uplink to the secondary base station.

Communication system, user apparatus, and base station

A user apparatus in a communication system includes: a plurality of user apparatuses each of which is configured to transmit a sounding reference signal (SRS); and a base station configured to wirelessly communicate with the plurality of the user apparatuses. The user apparatus receives, from the base station, configuration information related to a wireless resource of the sounding reference signal allocated to another user apparatus.

User apparatus, base station, and communication system

A base station includes: a control unit that allocates one or more layers per terminal for transmission to one or more terminals, and configures positions in a frequency domain and a time domain of reference signals of each of the layers on the basis of at least one of information indicating a position of each of the terminals and information indicating condition of each of channel between the transmission device and the one or more terminals; a processing unit that arranges the reference signals of each of the layers in the frequency domain and the time domain on the basis of the positions in the frequency domain and the time domain configured by the control unit; and a precoding unit and a transmitting unit that perform space-division multiplexing on signals of one or more layers arranged by the processing unit, and transmit the multiplexed signals.

Transmission device, communication system, and transmission method

A transmitting apparatus includes a first signal generating unit that generates, on the basis of data a first signal transmitted by single carrier block transmission; a second signal generating unit that generates, on the basis of an RS, a second signal transmitted by orthogonal frequency division multiplex transmission; a switching operator that selects and outputs the second signal in a first transmission period and selects and outputs the first signal in a second transmission period; an antenna that transmits the signal output from the switching operator; and a control-signal generating unit that controls the second signal generating unit such that, in the first transmission period, the RS is arranged in a frequency band allocated for transmission of the RS from the transmitting apparatus among frequency bands usable in OFDM.

Transmitting apparatus, receiving apparatus, transmitting method, and receiving method

A transmission device according to the present invention includes a reference-signal information management unit as an identifier to identify an interfering terminal that is a possible terminal to perform communication interfering with communication with a target terminal that is a destination terminal of a data signal, and a transmitter to set a group ID for reference signal generation to a group formed by the interfering terminal and the target terminal.

Transmission device, receiving device, base station, terminal, and transmission method which improve interference estimation

When arranging a reference signal generated by a pseudorandom number on specified time and frequency, an information processing unit () determines whether or not to arrange a 1 OFDM symbol or 2 OFDM symbols including a reference signal at a position determined in each slot, and determines whether or not to additionally arrange an OFDM symbol including a reference signal in the same slot. A multiplexing unit () performs multiplexing of a reference signal in accordance with the determination by the information processing unit ().

Transmission device having processing circuitry to determine to arrange a OFDM symbol including a reference signal

Provided is a communication system, etc. with low latency and high reliability, under New Radio (NR). A communication system includes a communication terminal device, and a plurality of nodes configured to be connected to the communication terminal device for radio communication and to provide a split bearer for the communication terminal device. The communication terminal device is configured to perform uplink transmission to an uplink transmission node among the plurality of nodes. The uplink transmission node is determined by an uplink transmission node determination process in which a node that provides the uplink transmission from the communication terminal device with lower latency among the plurality of nodes is determined as the uplink transmission node.

Communication system, communication terminal device, and communication node

The base station allocates, to one terminal, at least one transmission layer and allocates at least one resource block that is a minimum allocation unit of a communication resource in each transmission layer, to transmit a signal to the terminal, and includes processing units each associated with one of the transmission layers, the processing units being equal in number to the transmission layers. Each processing unit includes a reference signal generation unit to generate a reference signal to be used by the terminal in demodulation processing on a received signal, and an information processing unit to determine an arrangement of the resource block in which to transmit the reference signal to the terminal, based on at least one of a state of a channel between the base station and the terminal or information on the resource block to be used in transmission of the reference signal in an adjacent cell.

Transmitting apparatus and receiving apparatus

A transmission apparatus that transmits a block signal including a plurality of data symbols, includes: a data-symbol generation unit that generates a data symbol; a symbol arrangement unit that arranges the data symbol and a same-quadrant symbol such that one same-quadrant symbol that becomes a signal point in a same quadrant in a complex plane is inserted per block at a predetermined position in each block signal to generate a block symbol; a CP insertion unit that inserts a Cyclic Prefix into the block symbol; and an interpolation unit that performs interpolation processing on the block symbol on which CP insertion has been performed.

Transmission apparatus that transmits a block signal

Transmission device, receiving device, base station, terminal, and transmission method

Growing community of inventors

Tokyo, Japan

Fumihiro Hasegawa