National Institute of Information and Communications Technology, Incorporated

Gabriel Porto Villardi

Hiroshi Harada

Chen Sun

Chin-Sean Sum

Zhou Lan

Tuncer Baykas

Ha Nguyen Tran

Yohannes Alemseged Demessie

Chang-Woo Pyo

Chunyi Song

Mohammad Azizur Rahman

Junyi Wang

A wireless device capable of enabling improvement in reliability of communication, enlargement of cell regions, improvement in PER and improvement in system performance is provided. The wireless device according to an embodiment is a wireless device which transmits information for a counterpart wireless device, and includes a signal processing unit which generates a symbol sequence; a transmission vector calculating unit which converts the symbol sequence into a plurality of transmission symbol sequences, and controls phases of the transmission symbol sequences to be a same phase or an opposite phase based on a channel estimation to the counterpart wireless device; and a plurality of antennas each of which transmits the plurality of transmission symbol sequences.

Wireless device

One wireless communication networkdetermines an interference degree with the corresponding other wireless communication networkfor each channel by accessing a CMDBstoring positional information, channel information, and respective coexistence methods of other wireless communication networks, selects other wireless communication networkto coexist, a coexisting channel, and a coexisting method thereof based on the interference degree for each determined channel, and reflects the selected network, channel, and coexistence method to the CMDB, and transmits a signal for requesting coexistence with respect to selected wireless communication network, to the CMDB, and the selected wireless communication networkperforms a control for coexistence in the communication space between one wireless communication network and the selected wireless communication network based on the channel reflected to the CMDBand the coexisting method thereof.

Method and system for coexistence between wireless communication networks

Disclosed is a wireless communication system and the like that can avoid interference even if a plurality of networks coexist. The wireless communication system includes a primary user, cluster head equipment, and a secondary user. The cluster head equipment is for providing a local area network to a cluster region containing the abovementioned primary user. Also, the cluster head equipment contains: an acquisition means that acquires one or both&#x2014;of information regarding the primary user and information regarding a primary signal&#x2014;and the like; and a transmission means that transmits information to the secondary user. Then, using this wireless communication system, the secondary user performs cognitive wireless communication or the like on the basis of the information received from the transmission means of the cluster head equipment.

Wireless communication system, cluster head equipment (CHE) installed in wireless communication system, and wireless communication method

A wireless device and a communication method, which enable a position of the wireless device to be known and enable a frequency which does not interfere with that of another wireless station to be selected, are provided. A wireless device belonging to a second wireless system in which a frequency band to be used overlaps with that of a first wireless system, and a priority with which the overlapping frequency band is used is lower than that of the first wireless system, the wireless device includes: a location receiving unit receiving location information formed of a place name and indicating a location of the wireless device; a geographic coordinate acquiring unit acquiring, based on the location information, geographic coordinates including latitude and longitude corresponding to the location information; and a frequency setting unit accessing a frequency server in which a frequency assigned to a wireless device belonging to the first wireless system and geographic coordinates including latitude and longitude related to a position of the wireless device are stored by being corresponded to each other, by using the geographic coordinates acquired by the geographic coordinate acquiring unit, and acquiring at least one of a frequency that is not assigned to the wireless device belonging to the first wireless system and a frequency which is not at risk of interfering with that of the wireless device, to set the frequency as a transmission/reception frequency.

Wireless device and communication method

Growing community of inventors

Koganei, Japan

Gabriel Porto Villardi