Wireless communication system, wireless communication method, transmission device, control method, and recording medium

A wireless communication method used for controlling a wireless communication system that includes a transmission device, a relay device, and a reception device and is configured to execute direct communication of directly transmitting a wireless signal from the transmission device to the reception device without routing through the relay device and indirect communication of indirectly transmitting a wireless signal from the transmission device to the reception device through the relay device, the wireless communication method comprising:

• estimating a disconnection continuation time that is a time during which the direct communication is not executable in a case where the direct communication is not executable while the direct communication is repeatedly executed;
• and
• continuing to execute the direct communication when the disconnection continuation time is shorter than a threshold time and executing the indirect communication when the disconnection continuation time is longer than the threshold time.

A transmission device configured to execute direct communication of directly transmitting a wireless signal to a reception device without routing through a relay device and indirect communication of transmitting a wireless signal to the relay device so as to indirectly transmit the wireless signal to the reception device through the relay device, the transmission device comprising:

• a controller configured to estimate a disconnection continuation time that is a time during which the direct communication is not executable in a case where the direct communication is not executable while the direct communication is repeatedly executed, continue to execute the direct communication when the disconnection continuation time is shorter than a threshold time, and execute the indirect communication when the disconnection continuation time is longer than the threshold time.

A control method used for controlling a transmission device configured to execute direct communication of directly transmitting a wireless signal to a reception device without routing through a relay device and indirect communication of transmitting a wireless signal to the relay device so as to indirectly transmit the wireless signal to the reception device through the relay device, the control method comprising:

• estimating a disconnection continuation time that is a time during which the direct communication is not executable in a case where the direct communication is not executable while the direct communication is repeatedly executed;
• continuing to execute the direct communication when the disconnection continuation time is shorter than a threshold time and executing the indirect communication when the disconnection continuation time is longer than the threshold time.

A non-transitory computer-readable recording medium having stored therein a program for causing a computer to execute a process for controlling a transmission device configured to execute direct communication of directly transmitting a wireless signal to a reception device without routing through a relay device and indirect communication of transmitting a wireless signal to the relay device so as to indirectly transmit the wireless signal to the reception device through the relay device, the process comprising:

• estimating a disconnection continuation time that is a time during which the direct communication is not executable in a case where the direct communication is not executable while the direct communication is repeatedly executed;
• continuing to execute the direct communication when the disconnection continuation time is shorter than a threshold time and executing the indirect communication when the disconnection continuation time is longer than the threshold time.