Kddi Corporation

Namiki Seimitsu Houseki Kabushiki Kaisha

Ddi Corp.

Kddi R&d Laboratories, Inc.

Other

Kdd Corporation

Satoshi Konishi

Takeo Ohseki

Toshiaki Yamamoto

Xiaoqiu Wang

Toshihiko Komine

Yosuke Akimoto

Yasuyuki Hatakawa

Hajime Nakamura

Yoji Kishi

Tomoko Matsumoto

Takeshi Kitahara

Shinichi Nomoto

Akio Ishikawa

Shinobu Nanba

Noriaki Miyazaki

Hiroyuki Fukuoka

Takeshi Mizuike

Yuji Ikeda

Koichiro Kitagawa

A terminal device is configured to establish a communication link with communication equipment through a base station device such that, upon establishing the communication link, part of the communication link is left for a certain base station while another part of the communication link is established with the terminal device through the other base station device according to a plurality of architectures, wherein the terminal device includes a wireless communication part configured to transmit support architecture information representing an architecture supported by the terminal device among a plurality of architectures to the base station device.

Terminal device, base station device, and usable architecture determination method

A terminal device includes a wireless communication part configured to wirelessly communicate with base station devices; a link controller configured to establish a link with a primary base station device (PCell) so as to enable a wireless communication via the wireless communication part while establishing a link with a secondary base station device (SCell) so as to enable a wireless communication via the wireless communication part; a primary base station link failure detector configured to detect a radio link failure in the wireless communication with the primary base station device based on the predetermined condition; and a primary base station link failure information transmitter configured to wirelessly transmit the information, concerning the radio link failure with the primary base station device, to the secondary base station device when the primary base station link failure detector detects the radio link failure status.

Terminal device, base station device, communication system, and communication method

A communication apparatus performs communication in a manner such that communication with a first base station apparatus using a first frequency band and communication with a second base station apparatus using a second frequency band are switched on a per-subframe basis, obtains, from the first base station apparatus, specification information that specifies a subframe in which the first frequency band should be used and a subframe in which the second frequency band should be used among a plurality of subframes included in one or more frames, and performs control on the basis of the specification information to communicate with the first base station apparatus in the subframe in which the first frequency band should be used and with the second base station apparatus in the subframe in which the second frequency band should be used.

Communication apparatus, method for controlling same, base station apparatus, method for controlling same, and computer-readable storage medium

A wireless communication terminal includes a base station communication part which communicates with a base station; an interterminal communication part which communicates with another wireless communication part; a communication failure detector which detects a communication failure with a first connected base station serving as a base station connected thereto; and a communication resume processor which carries out an interterminal communication with another wireless communication terminal so as to communicate with a second connected base station, connected to another wireless communication terminal, via another wireless communication terminal when a communication failure is detected with the first connected base station, thus carrying out a process of resuming a communication upon detecting the communication failure.

Apparatus and method of resuming wireless communication via interterminal communication between wireless communication terminals

A terminal device includes a wireless communication unit performing wireless communication; a connection control unit connecting to a first base station device to wirelessly communicate with the first base station device via the wireless communication unit, the first base station serving as a primary, the connection control unit connecting to a second base station device to wirelessly communicate with the second base station device via the wireless communication unit, the second base station device serving as a secondary; a detection unit determining whether quality of wireless communication between the terminal device and the first base station device is in a low state based on a predetermined condition; and a signal transmission control unit wirelessly transmitting via the wireless communication unit, a predetermined signal toward at least either the first or second base station device when the quality is determined to be in the low state by the detection unit.

Terminal device, base station device, communications system, and communications method

The present invention provides such pumping apparatuses that have very little deviation and high stability in pumping flow. A pumping apparatus comprises two members that are set along a longitudinal direction of a tube made of an elastic material with a relation that the space formed by grooves made in the two members holds the tube. The two members have reciprocal motion such that at least one of the two opposing members shuttles in parallel with the other opposing member and has a move-in motion such that at least one of the two opposing members vertically moves to the opposing surfaces of the other opposing member so that surrounding part of the groove thereof moves into an inner space of the groove of the other opposing member, by which motion the liquid in the tube is discharged from the tube by the deformation of tube cross sectional shape.

Pumping apparatus

A communication control apparatus, in a wireless communication system having an area in which coverage areas of a macro cell base station and a small cell base station using different frequency bands overlap, includes a storage unit and a control unit. The storage unit stores small cell base station information indicating whether the small cell base station is present within a coverage area of a macro cell base station. The control unit instructs a radio terminal apparatus present within the coverage area of the macro cell base station to perform quality measurement in a frequency band of the small cell base station when the small cell base station is present within the coverage area of the macro cell base station based on the small cell base station information.

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

A wireless communication system includes an upper transmission station and a lower transmission station, each serving as a transmission station, a terminal serving as a reception station. The upper transmission station allocates a downlink control channel for each terminal to part of a predetermined data-channel region ascribed to the lower transmission station based on a demodulation reference signal for each transmission station. Based on the allocation result, the lower transmission station allocates the downlink control channel for each terminal, which is disposed at art of the data-channel region thereof. The terminal decodes the downlink control channel based on the demodulation reference signal.

Wireless communication system, terminal, transmission station, and wireless communication program

A channel information compressing apparatus of the present invention includes a DCT part that performs discrete cosine transform on channel information (CSI) representing the state of a communication channel, and an information compressor that compresses high frequency components of information included in discrete cosine transform data which is produced by way of discrete cosine transform, thus compressing information while maintaining a good accuracy of channel information.

Channel information compressing apparatus adapted to a MIMO system and method

A radio frame control device comprises a controlling unit, a resource block allocation unit, and a resource block conversion unit. The controlling unit controls a downlink radio frame of an orthogonal frequency division multiple access scheme. The resource block allocation unit allocates resource blocks to a terminal station using any one of a plurality of resource block allocation methods respectively having different restrictions. The resource block conversion unit determines whether or not conversion is possible from allocation information of resource blocks allocated according to a first resource block allocation method into resource block allocation information by a second resource block allocation method. The resource block conversion unit converts the resource block allocation method for the resource block allocation information when the conversion is possible.

Radio frame control device, radio communication device, and radio frame control method

An initial access setting information generating apparatus includes a preamble information transmission number obtaining unit that receives and obtains the number of transmissions for preamble information in a non-contention type initial access procedure performed between a base station and a communication terminal, where the preamble information transmission number obtaining unit receives and obtains the number of transmissions after the initial access procedure is completed; an expected reception power determination unit that determines an expected reception power at the base station, based on the number of transmissions for the preamble information, which is obtained by the preamble information transmission number obtaining unit; and a set value communication unit that generates and outputs initial access setting information about the initial access procedure for the communication terminal, based on the expected reception power determined by the expected reception power determination unit.

Initial access setting information generating apparatus, method, and program, and base station apparatus

Provided is a base station apparatus that employs a dynamic scheduler mode which performs wireless resource allocation for each subframe and applies a result of the allocation to the corresponding subframe, or a continuous transmission scheduler mode which performs wireless resource allocation for each subframe appearing periodically based on a period P and applies a result of the allocation for the relevant subframe to P continuous subframes from a subframe n to a subframe n+P&#x2212;1. The base station apparatus includes a terminal communication device that communicates continuous transmission application ON/OFF information, which indicates whether or not the continuous transmission scheduler mode is employed, and continuous transmission period information, which indicates a period of continuous transmission scheduling according to the continuous transmission scheduler mode, to a terminal. The terminal communication device may store the continuous transmission application ON/OFF information and the continuous transmission period information in a PDCCH region.

Base station apparatus and communication terminal

A threshold computation apparatus obtains estimated interference power for an uplink from a terminal to a base station; a predetermined communication quality value necessary for the uplink; a maximum value of transmission power of the terminal; and transmission power of the base station for a downlink from the base station to the terminal. The apparatus subtracts a logarithmic value of the maximum value of the transmission power of the terminal from a logarithmic value of the transmission power of the base station for the downlink; adds a logarithmic value of the communication quality value and a logarithmic value of the estimated interference power to a result of the subtraction; and determines a result of the addition to be a logarithmic value of received power at the terminal; and computes a threshold based on the logarithmic value of the received power at the terminal and predetermined conditions.

Threshold computation apparatus and threshold computation program

A wireless base station apparatus communicates with first terminal devices belonging to the present cell by means of IDMA. The apparatus receives signals sent from the first terminal devices and at least a signal sent from a second terminal device belonging to another cell; separately extracts each received signal from the first terminal devices and the second terminal device from the signals received by the receiver and computes a channel value for each received signal, by using interference replica signals; sends information for requesting a second wireless base station apparatus which communicates with the second terminal device to send a log-likelihood ratio obtained based on a signal received from the second terminal device; performs decoding using the channel value for each first terminal device, and generates a log-likelihood ratio as a decoding result and the corresponding interference replica signal; and performs decoding using the log-likelihood ratio received from said second wireless base station apparatus and the channel value for the second terminal device, and generates a log-likelihood ratio as a decoding result and the corresponding relevant interference replica signal.

Growing community of inventors

Fujimino, Japan

Satoshi Konishi