Patent ID: 7751424

Claim:
A communication method for a carrier-sense-multiple-access (CSMA) network including a radio terminal and a base station to which the radio terminal belongs, the communication method supporting request-to-send/clear-to-send (RTS/CTS) to prevent a collision of packets due to a hidden terminal, the communication method comprising: RTS-transmitting including the base station transmitting a request-to-send (RTS) frame to the radio terminal during a transmission-suspend-period in which the radio terminal suspends transmission to prevent the collision of packets; wherein when the base station does not receive a clear-to-send (CTS) frame from the radio terminal due to a suspension of the transmission, and when there is another data frame to be transmitted to another radio terminal, the base station performs a communication with the another radio terminal in priority to a communication with the radio terminal and the radio terminal extends the transmission-suspend-period based on a usage period for which the another radio terminal uses a channel; RTR-transmitting including the radio terminal transmitting a request-to-receive (RTR) frame to the base station after the transmission-suspend-period has elapsed; and data-transmitting including the base station transmitting a data frame to the radio terminal in response to the RTR frame.