Transmit opportunity protection of a data frame in a wireless LAN system, method

PURPOSE: A transmission opportunity protection method of a data frame in a wireless LAN system is provided to increase throughput in a wireless LAN system and to optimize packet length and network environment. CONSTITUTION: A first transmission protection section(405) is set up according to a low transmission mode in a wireless LAN system. A data frame is combined within a predetermined transmission protection section. A second transmission protection section is set up according to a mode of the highest transmission rate. A data frame is transmitted within a predetermined protection section.