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IEEE802.11 BEB Implementation

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Hi,

I am Anbarasan. I want to modify the Binary Exponential Back-off (BEB) 
implementation of IEEE802.11 WLAN.
    
Can you help me in identifying the code section for BEB? BEB doubles the
contention window (cw) during transmission retry.

I googled but I could not find any. I browsed the source but I could not
identify the section that implements the BEB. 

Following is a comment in the file (driver/net/wireless/iwl-commands.h):
/*Device will automatically increase contention window by (2*CW) + 1 for each 
transmission retry.  Device uses cw_max as a bit mask, ANDed with new CW  value,
to cap the CW value.*/

The above is the BEB and I am looking for this implementation. I could not find
it. Kindly help. (I have a Intel Wireless card.)


Regards
Anbarasan

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