Regarding CID 1555, discussed on Monday, further investigation has shown
that while the SID has a bit that tells you whether what is being carried
is an A-MSDU or a plain MSDU, this bit is not part of the AAD because the
AAD expands SIDs to the full MAC address, losing the A-MSDU indication
in the process.
I therefore propose that CID 1555 be resolved like this (editorial suggestions
on how to avoid the ugly "In the context of PV<n> MPDUs," preambles welcome!):
Change 10.11 A-MSDU operation as follows:
AIn the context of PV0 MPDUs, a non-DMG STA
indicates support for payload protected A-MSDUs (PP A-MSDUs) or
signaling and payload
protected A-MSDUs (SPP A-MSDUs), when dot11RSNAActivated is true, in its RSNXE. A non-DMG STA
and its peer STA both determine and maintain a record of whether an encrypted A-MSDU sent to its peer is to
be a PP A-MSDU or an SPP A-MSDU based on the SPP A-MSDU Capable subfield of the Extended RSN
Capabilities field of the RSNXE (see 9.4.2.241 (RSN Extension element (RSNXE))). If a STA and its peer
STA are DMG STAs or both have their SPP A-MSDU Capable subfields equal to 1, A-MSDUs shall be
transmitted as SPP A-MSDUs. Otherwise, A-MSDUs shall be transmitted as PP A-MSDUs.(M57)
In the content of PV1 MPDUs, when dot11RSNAActivated is true, A-MSDUs shall not be transmitted if a STA and its peer STA both have their SPP A-MSDU Capable subfields equal to 1.
NOTE—This is because in a PV1 MPDU the indication of whether an A-MSDU is being carried is not part of the AAD (see Figure 12-20—AAD construction for PV1 MPDUs) and so is not protected.
Reception and transmission of A-MSDUs using a non-RSN association is unaffected by the value of the SPP
A-MSDU Capable subfield.(M57)
An AP may transmit an SPP A-MSDU for a GCR group address if it has successfully negotiated RSNA
(re)associations with all associated STAs that have an active GCR agreement for this group address.
(No changes to 3.2 SPP A-MSDU definition or C.3 dot11SPPAMSDUCapable
description.)
Further changes might be made in D2.0 to allow for SPP A-MSDUs in PV1 MPDUs,
if a way to make this possible is identified.
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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