US 12,355,508 B2
Wireless communication system, relay device, communication device, and wireless communication method
Daisuke Goto, Musashino (JP); Kiyohiko Itokawa, Musashino (JP); Yasuyoshi Kojima, Musashino (JP); Fumihiro Yamashita, Musashino (JP); Yosuke Fujino, Musashino (JP); and Kento Yoshizawa, Musashino (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 18/007,631
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Jun. 5, 2020, PCT No. PCT/JP2020/022254
§ 371(c)(1), (2) Date Dec. 1, 2022,
PCT Pub. No. WO2021/245908, PCT Pub. Date Dec. 9, 2021.
Prior Publication US 2023/0231596 A1, Jul. 20, 2023
Int. Cl. H04B 7/01 (2006.01); H04B 7/195 (2006.01); H04B 10/118 (2013.01)
CPC H04B 7/01 (2013.01) [H04B 7/195 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A wireless communication system that includes a plurality of communication devices and a relay device, which is mobile, the wireless communication system comprising
a first offset compensator configured to compensate for frequency offsets occurring during communications between the plurality of communication devices and the relay device,
wherein when the first offset compensator is provided on the relay device, the first offset compensator gives a statistical frequency offset obtained from a statistic of a plurality of frequency offsets occurring during communications between respective ones of the plurality of communication devices and the relay device to a receiver configured to receive wireless signals transmitted from respective ones of the plurality of communication devices, and
when the first offset compensator is provided on each of the plurality of communication devices, the first offset compensator gives a frequency offset occurring during communications between the communication device provided with the first offset compensator and the relay device to a transmitter configured to transmit wireless signals to the relay device,
wherein when the first offset compensator is provided on the relay device,
the first offset compensator calculates a mean value of the plurality of frequency offsets occurring during communications between respective ones of the plurality of communication devices and the relay device, thereby acquires the statistical frequency offset, gives the acquired statistical frequency offset to the receiver, and thereby changes a frequency band receivable by the receiver,
the receiver receives signals in the frequency band changed by the first offset compensator, and
wherein based on an altitude and an orbit of a moving body provided with the relay device, the first offset compensator estimates a plurality of frequency offsets occurring during communications between respective ones of the plurality of communication devices and the relay device, and acquires the statistical frequency offset using values of the estimated plurality of frequency offsets.