1. doc.: IEEE 802.11-11/0111r0 Submission January 2011 Nir Shapira, Celeno Communications No-MCS Recommendation in MFB Date: 2011-01-05 Authors: Slide 1

2. doc.: IEEE 802.11-11/0111r0 Submission January 2011 Nir Shapira, Celeno Communications Abstract We propose to add a No-MCS recommendation to the MFB field in VHTC Slide 2

3. doc.: IEEE 802.11-11/0111r0 Submission January 2011 Nir Shapira, Celeno Communications No-MCS Feedback In some cases of unexpected high inter stream interference, no MCS can be supported (not even MCS0) Current MFB does not support No-MCS feedback This can serve as an opt-out mechanism for a beamformee that cannot cancel interference for a certain MU group No-MCS feedback can use a dedicated TBD MFB value Slide 3

4. doc.: IEEE 802.11-11/0111r0 Submission January 2011 Nir Shapira, Celeno Communications No-MCS Feedback – cont’ No-MCS feedback is easier to interpret compared to an SNR feedback. Beamformer can react immediately Possible event flow: Slide 4 AP STA1 STA2 DL MIMO D2 D3 BA STA3 D1 BA BAR BA+ No-MCS DL MIMO D1 AP reacts immediately STA3 dropped (Nss=0) D2 More power for STA1/2 Less interference Slow reacting scheduler SW can analyze situation in background –Might want to redefine group or re-sound STA3

5. doc.: IEEE 802.11-11/0111r0 Submission January 2011 Nir Shapira, Celeno Communications Pre Motion Do you agree for a No-MCS recommendation, to signal the case where no MCS can be supported, and be assigned an unused MCS index in the MFB field Slide 5