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Re: [STDS-802-11-TGM] 11me/D1.0 CID 1555 (SPP and S1G)



--- This message came from the IEEE 802.11 Task Group M Technical Reflector ---

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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