Matsushita Electric Industrial Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Konica Corporation

The Furukawa Electric Co., Ltd.

Nippon Oil Company

Other

Oki Electric Industry Co., Ltd.

Nippon Steel Corporation

Mitsubishi Rayon Company, Limited

Oki Semiconductor Co., Ltd.

Panasonic Intellectual Property Corporation of America

Nec Electronics Corporation

Sun Patent Trust

Kurita Water Industries Ltd.

Osamu Kato

Katsuhiko Hiramatsu

Toyoki Ue

Atsushi Sumasu

Kenichi Miyoshi

Kazuyuki Miya

Mitsuru Uesugi

Masatoshi Watanabe

Hiroaki Asano

Hideki Kanemoto

Takahisa Aoyama

Noriyuki Shimizu

Junichi Aizawa

Nobuo Asano

Masaki Hayashi

Isamu Yoshii

Tsuyoshi Mizubata

Seiichi Uemura

Takashi Kitade

Toshiyuki Uehara

Hideki Shingu

Nobutaka Kato

Kiyoshi Hata

Yoshiko Saito

Takao Hirose

Hiroaki Takashima

Shunichi Yamamoto

Izumi Horikawa

Satoru Endo

Masaru Ohta

Masaaki Yoshino

Yasuhiro Aoyama

Masashi Aoki

Tsutomu Kihara

Akinori Tatsumi

Hidenori Kayama

Eiji Katsura

Atsushi Iwaoka

Guizeng Shi

Kazuaki Ito

Keiichi Kitagawa

Takeshi Akiyama

Takahiro Sato

Daisuke Yamada

Yutaka Arai

Toshio Shida

Yasuyuki Morishita

Kozi Nishida

Kazuhiro Hirota

Takaaki Sakane

Morihisa Hirata

Masanobu Osawa

Yoshio Sohda

Takakazu Endo

Masanobu Kawano

Junichi Fujita

Taku Nagase

Taketoshi Toyama

Akira Uchikawa

Takeyoshi Doko

Masahiro Yamagata

Satoshi Nishida

Yasufumi Ichikawa

Takayuki Nakano

Makoto Kaneko

Katsuhisa Kodama

Yoshiyuki Nagase

Yukio Kasabo

Shigetoshi Suzuki

Hirokazu Yamaguchi

Ryuichi Fukuzato

Homare Koutate

Toshiki Maezono

Michiharu Harakawa

Kametaro Itoh

Masatoshi Furuyama

Takefumi Kouno

Masatsugu Saito

Sojiro Norita

Kouji Hirakami

Ken Kobayashi

Shigeo Hara

Hajime Nakajima

Kazumi Endo

Masaru Ota

Takao Naito

Terukazu Matsuda

Kazuaki Itou

Tomohiro Morita

Hideharu Nakayama

Masahisa Okuda

Junko Tsunasawa

Fumiharu Jito

Kei Okamoto

Gen-Ichiro Ota

Kunihiko Gotoda

A wireless system can use a shared frequency mainly used by an existing first wireless system under predetermined sharing conditions, and includes a communication unit performing wireless communication with a terminal accommodated in a communication area, at least one sensor disposed around the communication area and measuring reception power of a signal sent from the inside of the communication area via the communication unit, a memory storing beam data indicating a correspondence relationship between a beam direction of the signal and a measurement result in the sensor, a determination unit determining allowable maximum transmission power of the signal in each beam direction on the basis of the sharing conditions and the beam data, and an allocation unit allocating a radio resource to the terminal on the basis of the allowable maximum transmission power in each beam direction and channel state information reported from the terminal.

Wireless system capable of using shared frequency, radio resource allocation method in wireless communication using shared frequency, and base station

A shared frequency management apparatus includes a communicator receiving application information regarding use of a shared frequency band from each of base stations of plural different communication companies, a determiner determining whether or not allocation of different TDD patterns during use of adjacent carrier frequencies among plural carrier frequencies included in the shared frequency band is possible on the basis of the application information from each base station, a setter setting the TDD pattern for each of the carrier frequencies on the basis of the application information from each base station and a determination result of whether or not allocation of the different TDD patterns is possible, and a decision unit deciding an allocation content of the shared frequency band to each base station, satisfying the application information from each base station, on the basis of a setting result of the TDD pattern for each carrier frequency.

Shared frequency management apparatus and shared frequency management method

A wireless communication system includes a first base station connectable to a backbone network by a wireless backhaul, and a path generator generating a wireless multi-hop path including the first base station and one or more second base stations connected to the first base station by a wireless multi-hop. The first base station reports a measurement result of a line quality of the wireless backhaul and a measurement result of a line quality between the first base station and the second base station disposed around the first base station. The first base station is switched to a first mode connected to the backbone network by the wireless backhaul or to a second mode connected to the second base station by a wireless multi-hop, in response to the path signal.

Wireless communication system, wireless communication method, and base station

A wireless terminal that: for previous communications between the wireless terminal and base stations, stores as a communication history at least position information for the wireless terminal and information pertaining to each base station; acquires the position information for the wireless terminal and, on the basis of the position information for the wireless terminal and the stored communication history, derives from multiple base stations at least a connection subject base station to be used in data communication and a connection standby base station, which is the base station having the next highest connection priority after the connection subject base station; and performs data communication when a trial connection with the connection subject base station has succeeded, and switches the connection subject base station to be used in data communication to the connection standby base station when communication with the connection subject base station is interrupted.

Wireless terminal and base station switching method

A wireless receiver measures a reception parameter while scanning multiple pieces of reception directivity for an interval during which a signal is not transmitted from a wireless transmitter. The wireless transmitter transmits a signal while scanning multiple pieces of transmission directivity, and the wireless receives measures a reception parameter relating to reception of the signal and determines k pieces of transmission directivity that correspond to high-ranking k results, respectively, of the measurement that have a great reception parameter. The wireless transmitter forms any transmission directivity and transmits a signal, and the wireless receives measures a reception parameter while scanning M pieces of reception directivity and determines reception directivity that is to be used for data communication.

Wireless communication system, wireless communication apparatus and directivity determination method

Provided is a wireless relay device that determines whether or not the wireless relay device has to withdraw from a first wireless multi-hop network to which the wireless relay device itself belong, transmits, in a wireless multi-hop, a request for a connection that uses wireless communication in compliance with a first communication scheme between the wireless relay device and at least one wireless base station, to a wireless base station on the first wireless multi-hop network, according to a result of the determination that the wireless relay device withdraws from the first wireless multi-hop network, and allocates the wireless communication in compliance with the first communication scheme between the wireless relay device and the at least one wireless base station according to a control signal that is transmitted from the wireless base station on the first wireless multi-hop network.

Wireless communication system, wireless relay device and wireless communication method

A wireless terminal capable of communicating with multiple wireless base stations through a network in which multiple wireless communication methods are used in a mixed manner. A storage unit stores, as a communication history, at least location information for the wireless terminal and information pertaining to the wireless base station at the time of communication with each wireless base station. An acquisition unit acquires the location information for the wireless terminal. On the basis of the acquired location information for the wireless terminal and the communication history stored in the storage unit a derivation unit derives a connection base station from the multiple wireless base stations, as the wireless base station to be used in data communication. A communication unit performs data communication with the derived connection base station.

Wireless terminal and wireless base station allocation method

A base station holds information on uplink radio resources which has been allocated to at least one already connected communication terminal for performing radio communication using a high frequency with the base station, receives a notification of participation in a radio communication system from a new communication terminal, and allocates unallocated uplink radio resources using high frequencies to the new communication terminal based on the information on the uplink radio resources when received the notification of participation. The new communication terminal transmits data to the base station by using the allocated uplink radio resources.

Radio communication system, base station and radio communication method

Provided is a communication terminal configured to communicate with base stations, including a memory and a processor. The processor executes a position acquisition task that acquires position information on the communication terminal, an accumulation task that accumulates connection frequency information and discontinuance frequency information that relate to communication with each of the base stations at a position of the communication terminal, a determination task that determines a connection priority for preferentially making a connection to each of the base stations from a position of the communication terminal, based on the connection frequency information and the discontinuance frequency information at the position of the communication terminal, a connection control task that controls a connection to each of one or more base stations, in a descending order of the determined connection priority, and a communication task that performs data communication with the one or more base stations.

Communication terminal and communication method

A wireless base station extracts a connection base station from a plurality of other wireless base stations, as a candidate of a wireless base station which communicates user data with a wireless communication terminal, based on positional information of the wireless communication terminal, information of a wireless communication method capable of being employed by the wireless communication terminal, information of ranges in which the other wireless base stations are able to communicate, and information of wireless communication methods capable of being employed by the other wireless base stations.

Wireless base station, wireless communication system, and base station allocation method

A shared frequency management system that manages sharing of frequencies of a shared frequency band mainly used by a first wireless system with a second wireless system, includes an input unit that receives first border information regarding a first border indicating a border of a first region in which a reception level based on transmission of a first wireless signal using the frequencies of the shared frequency band from the first wireless system becomes a defined value, a deriving unit that derives second border information regarding a second border indicating a border of a second region in which a reception level based on transmission of a second wireless signal using the frequencies of the shared frequency band from the second wireless system becomes the defined value, and a permission condition determination unit that determines a sharing permission condition regarding the frequencies of the shared frequency band for the second wireless system on the basis of the first border information and the second border information.

Shared frequency management system and shared frequency management method

There is provided a wireless base station device capable of reducing a communication delay time related to communication of a priority call. A wireless base station device includes a processor a memory, and an antenna. The memory stores a wireless resource allocated to a priority call of radio channels for transmission of data with a wireless communication terminal before a priority call is generated under the control of the processor. The processor allocates the wireless resource stored in the memory to a generated priority call. The antenna performs communication of data of the priority call by using the allocated wireless resource.

Wireless base station device, server, and wireless communication method for communicating priority data and non-priority data

A base station includes a memory holding information on P terminals in connecting to the base station, where P is an integer of 3 or more, a determination unit that determines L terminals to transmit a reference symbol used for measurement of channel state information indicating a state of a propagation path to the base station from among the P terminals based on the information on the P terminals, at every data transmission cycle, where L is an integer satisfying 2&#x2264;L&#x3c;P, a selector that selects M terminals capable of spatial multiplexing communication in the data transmission cycle based on a measurement result of the channel state information based on reception of the reference symbol transmitted from L terminals, where M is an integer satisfying 2&#x2264;M&#x2264;L, and receives respective pieces of data transmitted from the M terminals via a plurality of antennas.

Terminal, base station, wireless communication system, and method of acquiring channel state information

A base station is capable of wireless communication with a plurality of terminals, the base station includes a memory that holds information on P (P: an integer of 3 or more) terminals currently connected to the base station, a determination unit that determines L (L: an integer satisfying 2&#x2264;L&#x3c;P) terminals that are to report channel state information indicating a state of a propagation path to the base station from among the P terminals based on the information on the P terminals, at every data transmission cycle, a selector that selects M (M: an integer satisfying 2&#x2264;M&#x2264;L) terminals capable of spatial multiplex communication in the data transmission cycle based on the reporting of the channel state information from the L terminals, and a communicator that transmits data to and from the M terminals via a plurality of antennas using the spatial multiplex communication.

Terminal, base station, wireless communication system and channel state information acquisition method

Provided is a wireless communication apparatus capable of improving communication quality and reducing a communication time delay in a case of communicating data over a backhaul line. The wireless communication apparatus is a wireless communication apparatus which communicates with another wireless communication apparatus over a wireless backhaul line in which a plurality of wireless communication schemes are mixed and used, and includes a processor that determines whether or not to add redundant data to data, in accordance with an allowable delay time of the data, and an antenna that transmits the data by adding or not adding the redundant data to the data, in accordance with a result of the determination.

Wireless communication apparatus and wireless communication method

Growing community of inventors

Yokosuka, Japan

Osamu Kato