No.
The operation of backoff decrement in 802.11e EDCA is significantly
different from 802.11 DCF.
In DCF, transmission occurs whenever the backoff counters reach zero.
In EDCA, however, transmission occurs on the first slot boundary after
the backoff counter has reached zero.
STAs wait for a
Thanks.
I already checked the code (mac-timers_802_11e.cc, mac-802_11e.cc).
In BackoffTimer_802_11e::pause(), I can find the new EDCA rule as th following.
line 552, rtime_[pri] -= slottime;
line 582, if(EDCA)rtime_[pri] -= ((slots + 1) * slottime); // +1
slot for new EDCA rule
But, I
I have no knowledge about the TKN implementation. However, I don´t agree with
the interpretation of item 2. Because, when the backoff counter reach 0, the
station can transmit immediately, i.e., in the next slot time. The station
doesn´t wait for another AIFS interval.
>
> According to section 9
On Mar 15, 2006, at 1:40 PM, Jongman Heo wrote:
>
> According to section 9.9.1.3 in the IEEE 802.11e standard,
>
> one and only one of the following actions is allowed at slot
> boundaries:
> - decrement of backoff timer, or
> - initiate transmission, or
> - backoff procedure due to interna
According to section 9.9.1.3 in the IEEE 802.11e standard,
one and only one of the following actions is allowed at slot boundaries:
- decrement of backoff timer, or
- initiate transmission, or
- backoff procedure due to internal collision, or
- do nothing.
So,
1.
Backoff counter is resumed