US 11,929,781 B2
Terminal devices, communication methods, and communication systems
Ryota Shiina, Musashino (JP); Tomohiro Taniguchi, Musashino (JP); Kazutaka Hara, Musashino (JP); Shinya Tamaki, Musashino (JP); Tomoki Murakami, Musashino (JP); and Toshiro Nakahira, Musashino (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 17/790,990
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Jan. 23, 2020, PCT No. PCT/JP2020/002409
§ 371(c)(1), (2) Date Jul. 6, 2022,
PCT Pub. No. WO2021/149229, PCT Pub. Date Jul. 29, 2021.
Prior Publication US 2023/0033853 A1, Feb. 2, 2023
Int. Cl. H04B 10/11 (2013.01); H04B 10/80 (2013.01)
CPC H04B 10/11 (2013.01) [H04B 10/80 (2013.01)] 6 Claims
OG exemplary drawing
 
1. A terminal device that communicates with a base station by optical wireless communication and radio frequency (RF) wireless communication, the terminal device comprising:
an illuminance sensor that receives an optical signal for the optical wireless communication from the base station;
an information acquisition unit that retrieves signal information containing n bits (where n is an integer equal to or greater than 2) included in the optical signal;
an array generation unit that generates n pieces of signal information by sequentially shifting each bit of the signal information one bit at a time;
a list in which ID information and authentication information for initiating the RF wireless communication are associated; and
an analysis unit that performs a brute-force calculation of a correlation coefficient between the n pieces of signal information generated by the array generation unit and the ID information in the list, and selects the ID information with the maximum correlation coefficient.