A-10 (Leutert) WLAN 802.11n MIMO Analysis - Sharkfest - Wireshark
A-10 (Leutert) WLAN 802.11n MIMO Analysis - Sharkfest - Wireshark A-10 (Leutert) WLAN 802.11n MIMO Analysis - Sharkfest - Wireshark
Block-ACK Bitmap AnalysisSHARKFEST ‘10 | Stanford University | June 14 –17, 2010
Block-ACK Bitmap Analysis (cont.)Frame #TypeSequence #Bitmap (64 bits)4579458045814582458345844585458645874588Block ACKMPDU #1MPDU #2MPDU #3MPDU #4MPDU #5MPDU #6MPDU #7MPDU #8Block ACKStart Sequence # 1381+ 64 = 1445144511446114471F144811449 lost frame 01450114511E14521Start Sequence # 1389 + 64 = 1453FF FF …. FF FFFF FF …. FF EF45894590459145924593459445954596459745984599MPDU #1MPDU #2MPDU #3MPDU #4MPDU #5MPDU #6MPDU #7MPDU #8MPDU #9MPDU #10Block ACK1449 retransmitted1453 frame14541455145614571458145914601461Start Sequence # 1398 + 64 = 1462Trace file: D05_AMPDU.pcapFF FF …. FF FFSHARKFEST ‘10 | Stanford University | June 14 –17, 2010
- Page 1 and 2: WLAN 802.11n MIMO AnalysisJune 17,
- Page 3 and 4: Design Goals for 802.11n• IEEE 80
- Page 5 and 6: PHY layer improvementsModified OFDM
- Page 7 and 8: Channel Bonding (Channel 6 & 10)Rec
- Page 9 and 10: Channel Bonding (configuration)802.
- Page 11 and 12: Multi-Streaming Modulation802.11a/g
- Page 13 and 14: MCS Configuration1 spatial stream 2
- Page 15 and 16: MAC layer improvementsFrame Aggrega
- Page 17: A-MSDU AnalysisAll trace files made
- Page 20 and 21: Block-ACK MechanismRather than send
- Page 24 and 25: Block-ACK negotiation/activationThe
- Page 26 and 27: New HT Capabilities in Beacon Frame
- Page 28 and 29: Per-Packet Information Header (cont
- Page 30 and 31: AirPcap Nx and WiresharkAirPcap Nx
- Page 32 and 33: Analysing ‘Bad BAR’ problemSHAR
- Page 34 and 35: Analysing ‘Deadlock’ problemPro
- Page 36 and 37: Analysing ‘Deadlock’ problem (c
- Page 38 and 39: Backwards compatibility to a/b/gPre
- Page 40 and 41: Backwards compatibility to a/b/g (c
- Page 42 and 43: Future of 802.11nStandard has been
Block-ACK Bitmap <strong>Analysis</strong> (cont.)Frame #TypeSequence #Bitmap (64 bits)4579458045814582458345844585458645874588Block ACKMPDU #1MPDU #2MPDU #3MPDU #4MPDU #5MPDU #6MPDU #7MPDU #8Block ACKStart Sequence # 1381+ 64 = 1445144511446114471F144811449 lost frame 01450114511E14521Start Sequence # 1389 + 64 = 1453FF FF …. FF FFFF FF …. FF EF45894590459145924593459445954596459745984599MPDU #1MPDU #2MPDU #3MPDU #4MPDU #5MPDU #6MPDU #7MPDU #8MPDU #9MPDU #<strong>10</strong>Block ACK1449 retransmitted1453 frame14541455145614571458145914601461Start Sequence # 1398 + 64 = 1462Trace file: D05_AMPDU.pcapFF FF …. FF FFSHARKFEST ‘<strong>10</strong> | Stanford University | June 14 –17, 20<strong>10</strong>
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