Abstract: A communication apparatus that communicates with a counterpart apparatus in accordance with a hierarchical communication protocol that includes a first layer and a second layer higher than the first layer is provided. In the communication apparatus, in a case where received signal strength is less than a threshold in a received signal strength checking process repeated N times and a notification is not output from a first communication processor 10 in at least a predetermined period of time that includes a period of time during which the received signal strength checking process is repeated N times, a second command to terminate the connection with the counterpart apparatus is input into the first communication processor 10, so as to prevent a situation in which a packet is repeatedly retransmitted.

Abstract: If the number of non-interference channels in a master communication device 1 and a slave communication device 2 does not reach a minimum necessary number, at least one channel subject to interference only in the communication device 1 or 2 having a lower transmission power is selected as at least a part of a group of channels to be used for frequency hopping. That is, a channel subject to interference only in a device having a lower transmission power is used for communication. The device having a lower transmission power has a larger received signal strength indicator of a radio wave transmitted from a partner than the device having a larger transmission power, and thus is more unlikely to be influenced by interference due to external radio waves. This can suppress degradation of the communication quality in case of interference due to external radio waves.

Abstract: A communication apparatus that communicates with a counterpart apparatus in accordance with a hierarchical communication protocol that includes a first layer and a second layer higher than the first layer is provided. In the communication apparatus, in a case where received signal strength is less than a threshold in a received signal strength checking process repeated N times and a notification is not output from a first communication processor 10 in at least a predetermined period of time that includes a period of time during which the received signal strength checking process is repeated N times, a second command to terminate the connection with the counterpart apparatus is input into the first communication processor 10, so as to prevent a situation in which a packet is repeatedly retransmitted.

Abstract: A first distant apparatus performs communication of streaming data and other data for which a change in data transfer rate is required to be suppressed, and a second distant apparatus performs communication of phone book data and other data for which a change in data transfer rate is permitted. When communication with the first distant apparatus and communication with the second distant apparatus are concurrently performed, a first communication unit is selected for communication with the first distant apparatus and a second communication unit, which is faster than the first communication unit, is selected for communication with the second distant apparatus. Thus, it is possible to make a collision in communication less likely to occur, and to maintain the communication quality of the first type of data.

Abstract: A first distant apparatus performs communication of streaming data and other data for which a change in data transfer rate is required to be suppressed, and a second distant apparatus performs communication of phone book data and other data for which a change in data transfer rate is permitted. When communication with the first distant apparatus and communication with the second distant apparatus are concurrently performed, a first communication unit is selected for communication with the first distant apparatus and a second communication unit, which is faster than the first communication unit, is selected for communication with the second distant apparatus. Thus, it is possible to make a collision in communication less likely to occur, and to maintain the communication quality of the first type of data.