[Ns-developers] About 802.11 management frame

[Basim Javed]

hi

If I correctly understand the situation, I may add:
The concept of TXOP is limited for a given STA which has already won
contention; so there is no chance that "The Ap should send an Association
Response frame. But should this happen in the same TxOp? ". The AP will have
its own TXOP, which may enable sending one response frame only.

regards
B

On Tue, Apr 21, 2009 at 4:22 PM, Mirko Banchi <mk.banchi at gmail.com> wrote:

> Hi all,
>
> i've a question about 802.11 management frames. I'll try to explain the
> problem by an example. Suppose a sta1 is sending an Association request
> to an Ap.
> The Ap should send an Association Response frame. But should this happen
> in the same TxOp? I mean, between this frames exchange is possible
> another frame exchange for example a data frame exchange between sta2
> and ap? I read carefully the standard but this is not really explained.
> I deduced it in the clause 7.1.4 (point 2):
>
> -------
> Within all data or management frames sent in a CP by the QoS STAs
> outside of a controlled access phase
> (CAP), following a contention access of the channel, the Duration/ID
> field is set to one of the following
> values:
> a) For management frames, frames with QoS Data subfield set to 0, and
> unicast data frames with Ack
> Policy subfield set to Normal Ack,
> 1) The time required for the transmission of one ACK frame (including
> appropriate IFS values), if
> the frame is the final fragment of the TXOP, or
> 2) The time required for the transmission of one ACK frame plus the time
> required for the
> transmission of the following MPDU and its response if required
> (including appropriate IFS
> values).
> --------
>
>
> I think that this is very important! Working with block ack, there's
> need to work with management frame in order to negotiate block ack and
> i found it's complex if the management frame exchange could be completed
> in two different Txops even if i think that this doesn't make sense.
> Ns-3 for now works with management frames as they were data frames, so
> their exchange (for example association request/ association response)
> could not be completed in the same Txop.
>
> Thank you all,
>
> Mirko
>
>
> --
> Mirko Banchi
>
> e-mail:    mk.banchi at gmail.com
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>
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>
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>
>