According to the 802.11e standard:
"The intention of using the multiple frame transmission shall be indicated by the QSTA through the setting of the duration/ID values in one of the following two ways (see 7.1.4):
a) Long enough to cover the response frame, the next frame, and its response frame.
b) Long enough to cover the transmission of a burst of MPDUs subject to the limit set by dot11EDCATableTXOPLimit."
However, according to my observations, the duration fields of the frames sent at the beginning or during TXOP are set as the duration of "SIFS+ACK" only.
I guess this is because the exact TXOP duration cannot be determined when setting the duration field by the driver. Right?
Is there any way to fix it?
Thanks,
Sangho