[STDS-802-11] Questions on MAC Figures in Draft P802.11REVmc_D5.0
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All,
I have questions on two MAC figures in Draft P802.11REVmc_D5.0 (and
early versions). Any explanation is appreciated.
1) Figure 10-4: Some IFS relationships
In statement "Immediate access when Medium is idle >= DIFS or
AIFS[i]", should >= be >?
Because >= indicates two cases: > or =. The case > is no
problem, but case = may violate backoff rule. Because with =, a STA can
wait for DIFS or AIFS[i], then immediately access medium even after busy
medium (since medium is already idle for DIFS or AIFS[i] time).
2) Figure 10-13: Example of exponential increase of CW
Should the initial CW value (i.e., CWmin value) be 8 instead of 7?
Because if CW = 7 for initial attempt, it means CWmin = 7. Then for
the first retransmission, CW should be CWmin x 2 - 1 = 7 x 2 - 1 = 13,
and for the second retransmission, CW should be 7x2x2-1 = 27, ...
Jianlin Guo
Mitsubishi Electric Research Labs
Cambridge, MA, USA
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