Doc.: IEEE 802.11-11/0026r0 Submission January 2011 Sameer Vermani, QualcommSlide 1 VHT Supported MCS Field Date: 2011-01-17 Authors:

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Presentation transcript:

doc.: IEEE /0026r0 Submission January 2011 Sameer Vermani, QualcommSlide 1 VHT Supported MCS Field Date: Authors:

doc.: IEEE /0026r0 Submission January 2011 Sameer Vermani, QualcommSlide 2 Abstract This document proposes a design of the VHT Supported MCS Set Field of the VHT Capabilities element

doc.: IEEE /0026r0 Submission Introduction Goal is to design “The Supported MCS Set field” that indicates which MCSs a STA supports –Different from 11n In 11n, an MCS was identified by an MCS index, which was represented by an integer in the range 0 to 76 (included the different Nss possibilities) In 11ac, MCS and Nss are disjoint quantities –Aim to reduce the number of options available and remove possibility of “holes” in supported MCS table Cleans up the standard and rate adaptation Assumptions –Transmit and receive support for MCS 0 through 7 in all the supported (BW, Nss) combinations unless It is a restricted MCS Data rate cut-off of a device forbids such a support (only allowed in highest BW) –Allowance for optional modes Support of MCSs 8 and 9 Support for more than 1 spatial stream. Sameer Vermani, QualcommSlide 3 January 2011

doc.: IEEE /0026r0 Submission Proposed Contents of VHT Supported MCS field Rx MCS Map –This consists of a 16 bit field which specifies max MCS supported for every Nss 2 bit number for each Nss value –00 will denote support for up to MCS 7 –01 will denote support for up to MCS 8 –10 will denote support for up to MCS 9 –11 will denote no support for that Nss Rx Highest Supported Data Rate –This field is needed to place a limit on the max data rate (13 bits) In units of Mb/s where 1 represents 1 Mb/s, and incrementing in steps of 1 Mb/s –This cutoff can over-ride a claim for support of a certain (MCS, Nss) combination for the highest supported BW Sameer Vermani, QualcommSlide 4 Rx MCS map January 2011

doc.: IEEE /0026r0 Submission Proposed Contents of VHT Supported MCS field Tx MCS Set Defined –1 bit specifying whether the Tx is advertising its MCS capability or not –Subsequent fields on this slide are irrelevant if this bit is set to 0 –When set to 1 Subsequent fields help the STA in choosing a more powerful AP or an AP more commensurate with its own capability Tx MCS Map –Exactly same as Rx MCS map defined in slide 3 Tx Highest Supported Data Rate –This field is needed to advertise the max data rate a device can transmit (13 bits) In units of Mb/s where 1 represents 1 Mb/s, and incrementing in steps of 1 Mb/s –This cutoff can over-ride a claim for support of a certain (MCS, Nss) combination for the highest BW Sameer Vermani, QualcommSlide 5 January 2011

doc.: IEEE /0026r0 Submission Frame Format: VHT Supported MCS Proposed frame format for the VHT Supported MCS field Sameer Vermani, QualcommSlide 6 January 2011

doc.: IEEE /0026r0 Submission Conclusion We proposed a simple way to convey the supported MCS set for 11ac Sameer Vermani, QualcommSlide 7 January 2011

doc.: IEEE /0026r0 Submission Pre-motion Do you agree with the VHT Supported MCS Set Field proposed in this presentation and agree to add it to the spec framework document ? Sameer Vermani, QualcommSlide 8 January 2011

doc.: IEEE /0026r0 Submission References [1] IEEE document 09/0992r18, “Proposed Specification Framework for TGac”, Robert Stacey et al Sameer Vermani, QualcommSlide 9 January 2011