Patent ID: 11958571
Assignee: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY
Field: Telecommunications (Electrical engineering)
Classification: CPC B  G  H | IPC B  G  H

Claim 4:
5. A maritime wireless communication method performing wireless communication between at least one buoy, a fishing vessel terminal device, a managing vessel terminal device, or a land control center, the maritime wireless communication method comprising
setting a reference spreading factor applied to each of the at least one buoy based on a communication quality of the at least one buoy by a gateway device installed in the fishing vessel terminal device or the managing vessel terminal device;
performing communication with the at least one buoy using the set reference spreading factor to receive sensing information obtained using at least one sensor and identification information and location information for the at least one buoy; and
analyzing the information received from the at least one buoy and, when an event condition including fishing gear loss occurrence, changing the reference spreading factor into a spreading factor higher than the reference spreading factor in performing communication with the at least one buoy, wherein the gateway device, when no event situation is detected, communicates with the at least one buoy at a spreading factor not more than the reference spreading factor to receive location information or battery status information from the at least one buoy and transmits control information to the at least one buoy, and
wherein the at least one buoy includes:
a power module providing power required for operating the at least one buoy;
a sensor module including at least one of a temperature sensor, an acceleration sensor, and an acoustic sensor and providing detected information;
a global positioning system (GPS) reception module providing the location information for the at least one buoy using a GPS signal;, a light indicator indicating a location of the at least one buoy; and
a control module processing a signal transmitted or received by a communication module and controlling an overall operation of the at least one buoy, wherein
each of the fishing vessel terminal device and the managing vessel terminal device includes the gateway device, a terminal, and an underwater acoustic tracker, wherein
the underwater acoustic tracker includes:
a serial interface (I/F) unit connected with the terminal using serial communication;
a transmission sensor transmitting an acoustic signal to the at least one buoy;
a reception sensor receiving an acoustic signal from the at least one buoy;
a multi-channel signal processing module detecting all information transmitted from the at least one buoy;
a multi-channel sound transmission module and a multi-channel sound reception module receiving a sound signal of a frequency band ranging from 5 Hz to 2,400 Hz at a certain depth, analyzing a strength and direction of the sound signal, multiplexing or demultiplexing the analyzed sound signal, and then transmitting the multiplexed or demultiplexed sound signal;
a control module receiving a communication option and the identification information for the at least one buoy from the terminal, transmitting, to the at least one buoy, the identification information according to the communication option, receiving the identification information for the at least one buoy and battery status information from the at least one buoy, and transmitting the received identification information and battery status information to the terminal; and
a battery providing power required for operating the underwater acoustic tracker, and wherein the gateway device measures the communication quality based on signal quality including a received signal strength indication (RSSI) or a signal-to-noise ratio (SNR) of a signal transmitted or received with the at least one buoy and sets the reference spreading factor based on the measured communication quality.