US 11,700,560 B2
Wireless communication system, wireless communication method and terminal device
Ryota Shiina, Musashino (JP); Kazutaka Hara, Musashino (JP); Tomohiro Taniguchi, Musashino (JP); Tomoki Murakami, Musashino (JP); and Toshiro Nakahira, Musashino (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 17/619,663
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Jun. 20, 2019, PCT No. PCT/JP2019/024584
§ 371(c)(1), (2) Date Dec. 16, 2021,
PCT Pub. No. WO2020/255354, PCT Pub. Date Dec. 24, 2020.
Prior Publication US 2022/0361070 A1, Nov. 10, 2022
Int. Cl. H04B 10/00 (2013.01); H04W 36/08 (2009.01); H04B 10/079 (2013.01); H04B 10/112 (2013.01); H04J 14/00 (2006.01)
CPC H04W 36/08 (2013.01) [H04B 10/0795 (2013.01); H04B 10/112 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A wireless communication system comprising:
an optical wireless access point;
a radio frequency (RF) wireless access point; and
a terminal device having a switching control unit that performs a communication process with the optical wireless access point and the RF wireless access point, wherein
assuming that illuminance of an optical signal for performing communication at a throughput set for communication with the optical wireless access point is requested illuminance, the switching control unit sets switching illuminance for maintaining illuminance of an optical signal received by the terminal device at the requested illuminance or higher during a time until connection switching between communication with the optical wireless access point and communication with the RF wireless access point is completed, measures received illuminance of an optical signal transmitted from the optical wireless access point during connection with the optical wireless access point, and compares measured received illuminance with the switching illuminance, and
when the received illuminance becomes lower than the switching illuminance during the connection with the optical wireless access point, the switching control unit performs connection switching from the communication with the optical wireless access point to the communication with the RF wireless access point.