A communication system configured to wirelessly communicate with a terminal, the communication system comprising: an access point; a first communication device (B102_1); and a second communication device (B102_2), wherein the access point is configured to wirelessly communicate with - the first communication device on at least a first channel included in a first frequency band which includes a first frame (B1201_1), and - the second communication device on at least a second channel included in a second frequency band which includes a second frame (B1201_2), wherein the second frequency band is different from the first frequency band, characterized in that the first communication device is configured to wirelessly communicate with - the access point by receiving in the first frequency band the first frame in a first time period; and - the terminal on at least a third channel included in the second frequency band by transmitting in the second frequency band a third frame (B1202_1) in a third time period different from the first time period, wherein the first time period and the third time period overlap, and the second communication device is configured to wirelessly communicate with - the access point by receiving in the second frequency band the second frame in a second time period; and - the terminal on at least a fourth channel included in the first frequency band by transmitting in the first frequency band a fourth frame (B1202_2) in a fourth time period different from the second time period, wherein the second time period and the fourth time period overlap, wherein the third channel is a same channel as the second channel, and the fourth channel is a same channel as the first channel. an access point; a first communication device (B102_1); and a second communication device (B102_2), wherein the access point is configured to wirelessly communicate with - the first communication device on at least a first channel included in a first frequency band which includes a first frame (B1201_1), and - the second communication device on at least a second channel included in a second frequency band which includes a second frame (B1201_2), wherein the second frequency band is different from the first frequency band, - the first communication device on at least a first channel included in a first frequency band which includes a first frame (B1201_1), and - the second communication device on at least a second channel included in a second frequency band which includes a second frame (B1201_2), wherein the second frequency band is different from the first frequency band, characterized in that the first communication device is configured to wirelessly communicate with - the access point by receiving in the first frequency band the first frame in a first time period; and - the terminal on at least a third channel included in the second frequency band by transmitting in the second frequency band a third frame (B1202_1) in a third time period different from the first time period, wherein the first time period and the third time period overlap, and - the access point by receiving in the first frequency band the first frame in a first time period; and - the terminal on at least a third channel included in the second frequency band by transmitting in the second frequency band a third frame (B1202_1) in a third time period different from the first time period, wherein the first time period and the third time period overlap, and the second communication device is configured to wirelessly communicate with - the access point by receiving in the second frequency band the second frame in a second time period; and - the terminal on at least a fourth channel included in the first frequency band by transmitting in the first frequency band a fourth frame (B1202_2) in a fourth time period different from the second time period, wherein the second time period and the fourth time period overlap, - the access point by receiving in the second frequency band the second frame in a second time period; and - the terminal on at least a fourth channel included in the first frequency band by transmitting in the first frequency band a fourth frame (B1202_2) in a fourth time period different from the second time period, wherein the second time period and the fourth time period overlap, wherein the third channel is a same channel as the second channel, and the fourth channel is a same channel as the first channel.