IEEE P802.11 Wireless LANs Max Number of MSDUs in an A-MSDU 2012-03-08 Date: Author(s): Name Affiliation Address Phone 5775 Morehouse Dr Simone Merlin Qualcomm Inc 8588451243 smerlin@qualcomm.com San Diego, CA 92109 Guido Frederiks Qualcomm Inc Shukla Ashish Qualcomm Inc Menzo Wentink Qualcomm Inc Abstract Comment is from: 11-12-0752-03-00ac-lb188-comment-tgac-d3-0.xls Comment and editorial instructions refer to: Draft P802.11ac_D3.0.pdf Comment 6855 116.15 9.11 There is no limit on the Add an optional indication for a REVISE. Adopt number of MSDUs that receiver VHT STA to signal to resolution as in can be packed in an a transmitter VHT STA that the DCN 12/0917r1 sent in a MPDU. number of MSDUs per MPDU (this document) Potentially the number of shall be less than a given MSDUs can be very large. number; ability to limit the As an example, assuming number of MSDUs in a MPDU small packets of 62Bytes to <= 16 is suggested. The (e.g. ~TCP ACK) an indication can be in the form of MPDU of 11454Bytes a capability indication (TBD). could include up to 184 The current operation mode MSDUs. For a max sized (no limit) is also preserved; A-MPDU of 64 MPDUs Restriction can only be this can potentially result signaled by a VHT STA to a in >11000 MSDUs. These VHT STA; restriction refers to numbers are exemplary to number of MSDUs sent in any illustrate the problem. In MPDU where A-MSDU is general, processing a high allowed. and unpredictable number of MSDUs increases complexity of receiver
IEEE P802.11 Wireless LANs Max Number of MSDUs in an A-MSDU Date: 2012-03-08 Author(s): Name Affiliation Address Phone Simone Merlin Qualcomm Inc 5775 Morehouse Dr San Diego, CA 92109 8588451243 smerlin@qualcomm.com Guido Frederiks Qualcomm Inc Shukla Ashish Qualcomm Inc Menzo Wentink Qualcomm Inc Abstract Comment is from: 11-12-0752-03-00ac-lb188-comment-tgac-d3-0.xls Comment and editorial instructions refer to: Draft P802.11ac_D3.0.pdf Comment 6855 116.15 9.11 There is no limit on the number of MSDUs that can be packed in an sent in a MPDU. Potentially the number of MSDUs can be very large. As an example, assuming small packets of 62Bytes (e.g. ~TCP ACK) an MPDU of 11454Bytes could include up to 184 MSDUs. For a max sized A-MPDU of 64 MPDUs this can potentially result in >11000 MSDUs. These numbers are exemplary to illustrate the problem. In general, processing a high and unpredictable number of MSDUs increases complexity of receiver Add an optional indication for a receiver VHT STA to signal to a transmitter VHT STA that the number of MSDUs per MPDU shall be less than a given number; ability to limit the number of MSDUs in a MPDU to <= 16 is suggested. The indication can be in the form of a capability indication (TBD). The current operation mode (no limit) is also preserved; Restriction can only be signaled by a VHT STA to a VHT STA; restriction refers to number of MSDUs sent in any MPDU where A-MSDU is allowed. REVISE. Adopt resolution as in DCN 12/0917r1 (this document)
11-12-0917-03-00ac-lb188-cid-6855.docx