A method for transmitting a flow control request by a wireless node in a wireless communication system is disclosed. The method comprises receiving information related to a first destination and a second destination and information related to first and second threshold values for triggering the flow control request; based on a reception buffer status value being greater than the first threshold value and is less than the second threshold value, transmitting the flow control request to the first destination; and based on the reception buffer status value being greater than the second threshold value, transmitting the flow control request to the second destination.