US 11,855,749 B2
Satellite communication system, master station device and line connection method
Koichi Harada, Musashino (JP); Hiroki Shibayama, Musashino (JP); Masaki Shima, Musashino (JP); and Fumihiro Yamashita, Musashino (JP)
Assigned to NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
Appl. No. 17/781,372
Filed by NIPPON TELEGRAPH AND TELEPHONE CORPORATION, Tokyo (JP)
PCT Filed Dec. 13, 2019, PCT No. PCT/JP2019/048995
§ 371(c)(1), (2) Date May 31, 2022,
PCT Pub. No. WO2021/117235, PCT Pub. Date Jun. 17, 2021.
Prior Publication US 2023/0006735 A1, Jan. 5, 2023
Int. Cl. H04B 7/185 (2006.01); H04W 76/18 (2018.01); H04W 56/00 (2009.01)
CPC H04B 7/18584 (2013.01) [H04B 7/18589 (2013.01); H04W 56/0015 (2013.01); H04W 76/18 (2018.02)] 5 Claims
OG exemplary drawing
 
1. A satellite communication system that communicates via a communication satellite using one of a plurality of portable station devices as a master station device and another portable station device as a slave station device,
the master station device is configured to:
transmit a first control signal for the slave station device to establish synchronization;
determine that the slave station device is in a communicable state by a second control signal received from the slave station device that has received the first control signal and established synchronization; and
select one of at least one slave station devices in a communicable state and transmit a third control signal for instructing start of transmission of a communication signal to the selected slave station device and the subject device,
wherein when the master station device communicates with another slave station device different from the slave station device in communication and has received an instruction to switch to a destination slave station device selected from the slave station devices determined to be in a communicable state by the second control signal,
the master station device transmits a fourth control signal instructing to stop transmission of the communication signal to the slave station device in communication and the subject device, and
the master station device transmits a fifth control signal instructing to start transmission of a communication signal to the switching destination slave station device and the subject device.