At the recent ad hoc the following change was agreed to be ready for motion:
Change 11.5.3.4 Procedure at the block ack originator(#6171) as follows:
When a block ack agreement is torn down, the originator shall, for MPDUs under that block ack agreement (i.e., recipient and TID), irrespective of whether it transmitted or received a DELBA frame, behave as
follows:
If the last (highest in sequence number space) MPDU transmitted was not acknowledged, and the originator wishes to retry this, the originator shall:
a) Discard all MPDUs that have not been acknowledged, up to and excluding the last (highest in sequence number space) MPDU transmitted, and
b) Set the sequence number of the next MPDU to be transmitted outside the block ack agreement to the sequence number of the last (highest in sequence number space) MPDU transmitted.
Otherwise, the originator shall:
a) Discard all MPDUs that have not been acknowledged, up to and including the last (highest in sequence number space) MPDU transmitted, and
b) Set the sequence number of the next MPDU to be transmitted outside the block ack agreement to the sequence number immediately after that of the last (highest in sequence number space) MPDU transmitted.
However, I have had discussions with Tomo-san, who was unable to attend
the ad hoc due to the unfavourable timezone, and the outcome is that
we feel it would be better to be clearer that the intent is to allow
retry only outside of the BA agreement. We therefore propose the
following alternative wording:
[…]
If the last (highest in sequence number space) MPDU transmitted was not acknowledged, and the originator wishes to retry this, the originator shall:
a) Discard all MPDUs that have not been acknowledged, up to and excluding the last (highest in sequence number space) MPDU transmitted, and
b) Retry that last MPDU first, outside the block ack agreement, retaining its sequence number.
NOTE—The MPDU cannot be retried in a subsequent new block ack agreement.
Otherwise, the originator shall:
[…]
Thanks,
Mark
--
Mark RISON, Standards Architect, WLAN English/Esperanto/Français
Samsung Cambridge Solution Centre Tel: +44 1223 434600
Innovation Park, Cambridge CB4 0DS Fax: +44 1223 434601
ROYAUME UNI WWW:
http://www.samsung.com/uk
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