Method and device for transmitting frame through extended channel in broadband wireless communication network

A communication node in a wireless communication network, the communication node comprising:

• a processor;
• and
• a memory storing at least one instruction executable by the processor,
• wherein when executed by the processor, the at least one instruction causes the communication node to:
• perform a first monitoring operation on each of a first channel and a second channel;
• in response to determining that at least one of the first channel or the second channel is in a busy state as a result of the first monitoring operation, perform a random backoff operation by performing a second monitoring operation on each of the first channel and the second channel during a first period after the busy state ends and performing an operation of counting a random backoff counter for the first channel and the second channel when determining that both the first channel and the second channel are in idle states as a result of the second monitoring operation;
• and
• transmit a first frame in the first channel and the second channel, in response to determining that both of the first channel and the second channel are in the idle states as a result of the random backoff operation,
• wherein when a length of time during which the at least one of the first channel or the second channel is determined as being in the busy state is identifiable, the first period corresponds to a first waiting time, and when the length of time is not identifiable, the first period corresponds to a second waiting time longer than the first waiting time.