US 12,413,256 B2
Wireless communication system, relay apparatus and wireless communication method
Kazumitsu Sakamoto, Musashino (JP); Yosuke Fujino, Musashino (JP); Daisuke Goto, Musashino (JP); Yasuyoshi Kojima, Musashino (JP); and Kiyohiko Itokawa, Musashino (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 18/036,304
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Dec. 23, 2020, PCT No. PCT/JP2020/048233
§ 371(c)(1), (2) Date May 10, 2023,
PCT Pub. No. WO2022/137396, PCT Pub. Date Jun. 30, 2022.
Prior Publication US 2023/0412199 A1, Dec. 21, 2023
Int. Cl. H04B 1/04 (2006.01); H04B 1/00 (2006.01); H04B 7/185 (2006.01)
CPC H04B 1/0458 (2013.01) [H04B 1/006 (2013.01); H04B 7/185 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A wireless communication system comprising:
a first communication device;
a second communication device;
a mobile relay device;
an antenna configured to receive a first radio signal with a predetermined band including a desired frequency band associated with the first communication device;
a measurer configured to measure a signal level of an analog signal corresponding to the received first radio signal in the predetermined band;
a first outputter configured to amplify an amplitude of the input analog signal and extract the analog signal with the desired frequency band from the analog signal with the amplified amplitude when the analog signal corresponding to the received first radio signal is input;
a second outputter configured to extract the analog signal with the desired frequency band from the input analog signal and amplify the amplitude of the extracted analog signal when the analog signal corresponding to the received first radio signal is input;
a position detector configured to detect a position of the mobile relay device;
a storage configured to store the signal level of the analog signal in the predetermined band as history information in association with the position of the mobile relay device; and
a switching controller configured to
input the analog signal corresponding to the received first radio signal to the first outputter when the present position of the mobile relay device is the same as the position of the mobile relay device in the history information and the signal level associated with the position of the mobile relay device in the history information is less than a threshold, and
input the analog signal corresponding to the received first radio signal to the second outputter when the present position of the mobile relay device is the same as the position of the mobile relay device in the history information and the signal level associated with the position of the mobile relay device in the history information is equal to or greater than the threshold; and
a transmitter configured to transmit a second radio signal corresponding to the analog signal extracted by the first outputter or a third radio signal corresponding to the analog signal with the amplitude amplified by the second outputter to the second communication device.