method for medium access in wireless local area network system based on carrier sense multiple access with collision avoidance and apparatus thereof

The present invention of a number according to the CSMA / CA (carrier sense multiple access with collision avoidance) medium access in a wireless LAN based on the present invention relates to a control method and apparatus, transmitting terminal in a wireless LAN system based on CSMA / CA Priority assign different DIFS (DCF interframe space) dividing each group into groups, such as priority, if the terminal belongs to a group of priority to assign different back-off time according to the transmission priority, and the medium transport competition at each respective terminal is allocated transport within the same priority group by competing to reset the received backoff time priority and to ensure a reliable transmission opportunity to a high station, regardless of the number of terminals sends doctors in the wireless LAN system based on CSMA / CA first because surely guarantee, and standby time is different, each terminal transmits the chances of ranking higher terminal crash This reduces the room may cause the film throughput (throughput) decreased by conflict. CSMA / CA, MAC, IEEE 802.11, medium access backoff time, priority, DIFS