Contention based channel occupying method in wireless network using a plurality of channels

PURPOSE: A contention based channel seizure method on a wireless network using multiple channels is provided to increase channel occupying efficiency in a wireless network environment. CONSTITUTION: Terminals which are unable to transmit a data frame through the first contention obtain occupied channel information through the first contention from the terminal transmitting a data frame (530). The terminals confirm an occupation available channel based on the occupation channel information (540). The terminals perform second contention in the available channel (545). The terminal sets up to match a channel occupation period with the expiration time point. [Reference numerals] (510) First competition performance; (515,555) Competition result victory?; (520,560) Data frame transmission; (525,565) Transmission complete?; (530) Occupation channel information acquisition; (535) Available occupation channel check; (540) Is there occupation channel?; (545) Second competition performance; (550) Channel occupation end; (AA) Start; (BB,DD,GG,II,KK,MM) End; (CC,EE,FF,HH,JJ,LL) No