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Doc.: IEEE 802.11-13/0509r0 SubmissionSlide 1 Short Management and Short A-MSDU Frame Date: 2013-05-12 Authors: Liwen Chu, ST May 2013.

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Presentation on theme: "Doc.: IEEE 802.11-13/0509r0 SubmissionSlide 1 Short Management and Short A-MSDU Frame Date: 2013-05-12 Authors: Liwen Chu, ST May 2013."— Presentation transcript:

1 doc.: IEEE /0509r0 SubmissionSlide 1 Short Management and Short A-MSDU Frame Date: Authors: Liwen Chu, ST May 2013

2 doc.: IEEE /0509r0 SubmissionSlide 2 May 2013 Liwen Chu, ST

3 doc.: IEEE /0509r0 SubmissionSlide 3 May 2013 Liwen Chu, ST

4 doc.: IEEE /0509r0 Submission Slide 4Liwen Chu, ST Short Data/Management Frame in [1] Some fields in frame header are removed from short MAC data frame. Some fields in frame header are shortened in short MAC data frame. Issue: A-MSDU encapsulation of short data frames is missing. Issue: It is not clear whether management frame can be compressed. FC RA (MAC Address) TA (MAC Address) Sequence Control FCS 2B6B 2B4B Body variable FC Body FCS 4Bvariable A3 (Optional Present) 6B Sequence Control 2B A2 (AID) 2B A1(BSSID/RA) 6B FC From DS=0 2B Body FCS 4Bvariable A3 (Optional Present) 6B Sequence Control 2B A2 (BSSID) 6B A1 (AID) 2B FC From DS=1 2B Short frame with AID Short frame without AID May 2013

5 doc.: IEEE /0509r0 Submission Liwen Chu, ST Slide 5 Data and Management Frame in Data and Management frame formats are similar. So the short frame format can be used for decreasing management frame overhead also. 4-bit Type subfields can be used to differentiate the short data frames from the short management frames. May 2013 Body FCS 4Bvariable Sequence Control 6B Address 2 6B Address 1 6B Duration 2B FC 2B Address 3 2B HT Control 4B Body FCS 4Bvariable Sequence Control 6B Address 2 6B Address 1 6B Duration 2B FC 2B Address 3 2B HT Control 4B QoS Control 2B6B Address 4 Management Data

6 doc.: IEEE /0509r0 Submission A-MSDU in MSDUs from different SA, DA can be encapsulated in one A-MSDU. A-MSDU can be used for AP forwarding. Slide 6Liwen Chu, ST May 2013 To DSFrom DSAddress 1Address 2Address 3 (Basic A-MSDU Case) Address 4 (Basic A-MSDU Case) 00RA = DATA = SABSSIDN/A 01RA = DATA = BSSIDBSSIDN/A 10RA = BSSIDTA = SABSSIDN/A 11RATABSSID A-MSDU Subframe 1 A-MSDU Subframe 2 A-MSDU Subframe n DA SA LengthMSDU 6620 to 3 Padding variableOctets: A-MSDU Structure A-MSDU Subframe Structure AP STA1STA2STA3 Addresses in A-MSDU frame of STA1 to AP: RA=BSSID, TA=STA1, A3=BSSID, {SA=STA1, DA=Outside MAC or STAi in the BSS} Addresses in A-MSDU frame of AP to STA1: RA=STA1, TA=BSSID, A3=BSSID, {SA=Outside MAC or STAi in the BSS, DA=STA1}

7 doc.: IEEE /0509r0 Submission Short A-MSDU in MSDUs from the same SA, DA are in one short A-MSDU. The Short A-MSDU subframe structure is used only between a pair of STAs that communicate directly. Slide 7Liwen Chu, ST May 2013 To DSFrom DSAddress 1Address 2Address 3 (Short A-MSDU Case) Address 4 (Short A-MSDU Case) 00RA = DATA = SABSSIDN/A 01RA = DATA = BSSIDSAN/A 10RA = BSSIDTA = SADAN/A 11RATADASA A-MSDU Subframe 1 A-MSDU Subframe 2 A-MSDU Subframe n A-MSDU Structure LengthMSDU 20 to 3 Padding variableOctets: DMG short A-MSDU Subframe Structure

8 doc.: IEEE /0509r0 Submission 11ah Short A-MSDU Consideration 4 different addresses are required in relay operation. Duplicate MAC addresses in the A-MSDU subframe can be removed. The negotiated MAC address can be removed from the A- MSDU PPDU. 11ad short A-MSDU is less useful here because of lower throughput requirement of 11ah applications. Slide 8Liwen Chu, ST May 2013 AP Relay STA STA1STA3STA2 Source MAC Address (Out_Dev) Destination MAC Address Destination MAC Address (Out_Dev) Source MAC Address RA=Relay_STA TA=AP DA=STA1 SA=Out_Dev RA=STA1 TA=Relay_STA SA=Out_Dev RA=Relay_STA TA=STA1 DA=Out_Dev RA=AP TA=Relay_STA DA=Out_Dev SA=STA1

9 doc.: IEEE /0509r0 Submission Dynamic A-MSDU Format One or both of the SA, DA from an A-MSDU subframe which are same as the addresses in frame header or are negotiated between the transmitter and the receiver Presence of DA/SA is indicated with DA/SA Present bits in Subframe Control field –Enables dynamic indication of different DA(SA) for each A-MSDU subframe Relays can aggregate multiple MSDUs from/to different SA/DA and indicate it for each MSDU if DA(SA) is different from A3/A4 of MAC Header Short A-MSDU format is used in short frame 14 bits for Length field are sufficient for current Max MSDU length (2304 octets) –Can indicate up to octets of maximum MSDU length Slide 9Liwen Chu, ST May 2013 Octets: Subframe ControlDASAMSDUPadding B0-B13B14B15 LengthDA PresentSA Present A-MSDU subframe 1A-MSDU subframe 2…A-MSDU subframe n

10 doc.: IEEE /0509r0 Submission Straw Poll 1 Do you agree to include in ah SFD the AID and MAC address based short management frame with the management indication in FC TBD? Yes No Abstain Liwen Chu, ST May 2013

11 doc.: IEEE /0509r0 Submission Straw Poll 2 Do you agree to include in ah SFD that in an A-MSDU the transmitter may remove one or both of the SA, DA from an A-MSDU subframe which are same as the addresses in frame header or are negotiated between the transmitter and the receiver with A-MSDU format as described in slide 9? Yes No Abstain Liwen Chu, ST May 2013

12 doc.: IEEE /0509r0 Submission Reference [1] 11-11/1137r13 Proposed Specification Framework for TGah. Liwen Chu, ST May 2013


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