PURPOSE: A method is provided to effectively support a real time traffic and ensure a backward compatibility, while differentiating channel access regions between the real time terminal and non-real time terminal. CONSTITUTION: A method comprises a step(1000 to 1200) of constructing a first or a second competitive window in accordance with whether the corresponding terminal is a real time terminal or a non-real time terminal during channel access; and a step(1300,1400) of permitting the real time terminal to gain an access to the channel prior to the non-real time terminal by including a predetermined offset value to the second competitive window of the non-real time terminal in case where the real time terminal and the non-real time terminal request a channel access at the same time.
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