Wireless communication system and wireless communication method

A wireless communication system that performs wireless communication between a master device and a slave device via one communication channel, which is sequentially selected from a plurality of communication channels, the wireless communication system comprising:

• at least one of (i) a circuit and (ii) a processor with a memory storing computer program code executable by the processor, the at least one of the circuit and the processor configured to serve as
• a detector that detects characteristic data indicating communication quality in the performed wireless communication, for each of the communication channels;
• a deleter that deletes a communication channel, in which deterioration in communication quality is determined based on the characteristic data detected by the detector, from the plurality of communication channels used for the wireless communication;
• and
• a determiner that determines, based on the characteristic data of a neighboring communication channel close in frequency to a communication channel that has been deleted by the deleter, restorability of the deleted communication channel to the plurality of communication channels used for the wireless communication,
• wherein
• the determiner determines restorability of the deleted communication channel according to different determination standards of a case where both-side communication channels adjacent to the deleted communication channel, which is a restorability determination target, are usable for the wireless communication and a case where only one-side communication channel adjacent to the deleted communication channel, which is a restorability determination target, is usable for the wireless communication, and
• the determiner determines that,
• when the both-side communication channels adjacent to the deleted communication channel, which is a restorability determination target, are usable for the wireless communication, the deleted communication channel is restorable to the plurality of communication channels used for the wireless communication based on a fact that the characteristic data of the both-side communication channels satisfies a first restoration threshold, and
• when the only one-side communication channel adjacent to the deleted communication channel, which is a restorability determination target, is usable for the wireless communication, the deleted communication channel is restorable to the plurality of communication channels used for the wireless communication based on a fact that the characteristic data of the one-side communication channel satisfies a second restoration threshold indicating communication quality higher than communication quality indicated by the first restoration threshold.