The present invention concerns a communication method in a wireless communication network, wherein the method comprises at a station: sending to an access point station a frame comprising a buffer status report reporting an amount of buffered data to be transmitted; receiving, from the access point station, an allocation of a resource unit for the transmission of the buffered data; and transmitting the buffered data in the allocated resource unit; wherein the frame sent to the access point station further comprises a time indication representative of a time limit for the transmission of the buffered data by the station.