DIFS and AIFS values

[Steve muni]

Hi

In Wifi the DIFS parameter is defined as:

DIFS = SIFS + 2*TimeSlot

I would like modify the behaviour changing this formula to:

DIFS = SIFS + TimeSlot

However, I cant find in the code where is implemented. I suppose it is because now EDCA is being used and the DIFS parameter is replaced by AIFS. However I cant find the place where AIFS is defined. As far as I know the formula for AIFS is:

AIFS= AIFSN(ac)*TimeSlot + SIFS

Any Idea of how could I change manually the DIFS or AIFS parameter??

Many thanks

kind regards