Who decide "Duration"?

[yu-chieh kung]

Hi All,

Does anyone know who decide duration in ath10k.
Decided by rate table or ?

I am using 998x chipset with CT firmware in IBSS mode
I did some experiment.

I create a ack (or Block Ack), send via MGMT_TID.
the date rate is 6Mb, and duration is 60.

i check the normal ack (or Block Ack),
date rate is 6Mb as well, but the duration is 0.

is it possible to send ack with duration 0 via MGMT_TID?
or there is any other TID which is used for ACK?

Thanks.