Wireless communication system, wireless communication method and terminal device

A terminal device comprising:

• an optical wireless communication unit that performs communication with an optical wireless access point, and an RF wireless communication unit that performs communication with a radio frequency (RF) wireless access point;
• and
• a switching control unit that,
• assuming that illuminance of an optical signal for performing communication at a throughput set for the communication with the optical wireless access point is requested illuminance, 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, performs connection switching from the communication with the optical wireless access point to the communication with the RF wireless access point.

A wireless communication method comprising:

• by a switching control unit provided to a terminal device, 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, setting 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 radio frequency (RF) wireless access point is completed;
• measuring received illuminance of an optical signal transmitted from the optical wireless access point during connection with the optical wireless access point, and comparing 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, performing connection switching from the communication with the optical wireless access point to the communication with the RF wireless access point.