In addition, in case of transmission of the data 340 from the information processing device 202 to the information processing device 100 (341), reception power of the data 340 is high in the state that the information processing device 100 and the information processing device 202 are located relatively close to each other (342). In this case, a desired packet (packet 342) may be decodable at the time of reception of the desired packet attempted by the information processing device 100. In this case, the information processing device 100 is capable of transmitting the ACK 343.
As described above, decoding of the desired packet (data 342) may be allowed even during transmission of the packet (data 334) addressed to the different device and corresponding to an interfering wave on the assumption that sufficiently low reception power of the packet addressed to the different device and sufficiently high reception power of the desired packet (data 342) are expected. In this case, it is considered that transition to the packet detection state (listen state) 303 (shown in