MRG IFS Correction Date: July 2010 Authors: July 2010 Month Year doc.: IEEE 802.11-yy/xxxxr0 July 2010 MRG IFS Correction Date: July 2010 Authors: Ivan Pustogarov, IITP RAS John Doe, Some Company

Abstract IEEE P802.11aa/D1.00, April 2010, page 39, lines 36-42: Month Year doc.: IEEE 802.11-yy/xxxxr0 July 2010 Abstract IEEE P802.11aa/D1.00, April 2010, page 39, lines 36-42: If distance to the AP is different for different stations, Block Ack frames may overlap at the AP Ivan Pustogarov, IITP RAS John Doe, Some Company

July 2010 Example Due to air propagation, Block Ack1 and Block Ack2 may overlap at AP Ivan Pustogarov, IITP RAS

Proposed correction Change normative text : to: July 2010 Proposed correction Change normative text : … and shall transmit a BlockAck frame at a delay of (N+1)*SIFS + N*TXTIME(BlockAck) after the BlockAckReq. to: … and shall transmit a BlockAck frame at a delay of (N+1)*(SIFS+aAirPropagationTime) + N*TXTIME(BlockAck) after the BlockAckReq. The goal is to make IEEE 802.11aa-capable devices more universal so they can be used both in indoor and outdoor (outdoor long distance and TV bands) Ivan Pustogarov, IITP RAS

July 2010 Strawpoll Should the draft .11aa be changed according to the presentation? Yes: No: Abs.: Ivan Pustogarov, IITP RAS

Acknowledgements July 2010 The proposal was made in the framework of FP7 project “Flavia”. Ivan Pustogarov, IITP RAS