National Institute of Information and Communications Technology, Incorporated

Chin-Sean Sum

Zhou Lan

Hiroshi Harada

Fumihide Kojima

Gabriel Porto Villardi

Tuncer Baykas

Chen Sun

Ryuhei Funada

Mohammad Azizur Rahman

Chang-Woo Pyo

Chunyi Song

Junyi Wang

Where two or more wireless communication networks having mutually different physical layers coexist, and wireless communication is performed between a plurality of devices and a coordinator in each one of the wireless communication networks, the coordinator of one wireless communication network generates coexistence notification frame data to notify coordinators of the other wireless communication networks of existence of the coordinator. This first coordinator encodes the generated coexistence notification frame data, inserts source data so as to be set as FEC data, modulates the FEC data through a Gaussian frequency shifting keying system (GFSK) so as to be set as a GFSK modulated wave signal, and transmits the GFSK modulated wave signal to the coordinators of the other wireless communication networks.

Wireless communication system, and interference preventing method

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

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

An interference preventing method prevents communication interference between two or more wireless communication networks having mutually different physical layers, in which wireless communication is performed between a plurality of devices and a coordinator. By using a coordinator of each of the wireless communication networks, a scanning period for scanning a coexistence notification signal that is transmitted from a coordinator of another wireless communication network for a predetermined period is arranged before a first super frame immediately after input of power. The CB of the coordinator is transmitted at least once or more for one super frame, and, in a case where the CB transmitted from the coordinator of the other wireless communication network is acquired during the scanning period, control for preventing communication interference with the other wireless communication network is performed.

Growing community of inventors

Tokyo, Japan

Chin-Sean Sum