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Comments Clarification on VHT Format HT Control Field. Authors:. Date: 2010-06-24. Introduction. Slide 2. This presentation is comments clarification on VHT format HT Control field in Draft P802.11ac\_D1.0.

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Presentation Transcript
introduction
Introduction

Slide 2

This presentation is comments clarification on VHT format HT Control field in Draft P802.11ac_D1.0.

Currently, the Subfield of “MRQ, Unsolicited MFB” and each meaning of subfield in table 8-ac1 cannot satisfy the VHT requirement, and we propose our revise advice.

And the MCS subfield in table 8-ac2 also exist this problem.

The N_STS and NSTS definition is not definite and we propose some revise advice.

vht format ht control field problem statement
VHT format HT Control field Problem Statement

In VHT format HT Control field,MFB has four subfields (VHT N_STS, MCS, BW, SNR), so “MCS feedback” cannot represent the whole MFB meaning in VHT.

And MRQ has been used in IEEE 802.11n just meaning MCS request, but MCS in VHT is just one MFB subfield,so “MCS request” cannot represent the VHT MRQ meaning.

MRQ and MFB are used for VHT link adaptation. According to the context of the P802.11ac_D1.0 ( 9.27.3 Link adaptation using…) , MRQ meaning is “MFB request”, so “MRQ meaning” in table 8-ac1 cannot satisfy the VHT requirement.

Slide 3

recommend changes for vht format ht control field
Recommend changes for VHT formatHT Control field

Table 8-ac1

  • we propose our revise advice:
    • The MRQ in table 8-ac1 should bechanged into “VHT MRQ” and its meaning should bechanged into “MFB request”.
    • The Unsolicited MFB’s meaning in table 8-ac1 should bechanged into “Unsolicited MFB indicator”.

Slide 4

recommend changes for vht format ht control field1
Recommend changes for VHT formatHT Control field

The meaning of MCS subfield in table 8-ac2 should be the Recommended MCS, not the Recommended MCS feedback, the word "feedback" is redundant.

Table 8-ac2

  • we propose our revise advice:
    • The MCS meaning in table 8-ac2 should bechanged into “Recommended MCS”.

Slide 5

recommend changes for n sts and n sts
Recommend changes for N_STS and NSTS

NSTS is a parameter in 11ac, and N_STS is a subfield in table 8-ac1, which both means "Number of space time streams".

3.3 Abbreviations and acronyms

N_STS: Number of space time streams.

Add a Note blow the table 8-ac2:NSTS: Number of space time streams.

we propose our revise advice:

  • NSTS should be revised toN_STS in page 4 and should add a note for NSTS definitionfor its first time appearance.

Slide 6

summary
Summary
  • The problems are:
    • MRQ and Unsolicited MFB Subfield and their meaning in table 8-ac1 cannot satisfy the VHT requirement.
    • And the MCS subfield in table 8-ac2 also exist this problem.
    • The N_STS and NSTS definition is not definite
  • These slides provide solutions to the problems:
    • The MRQ in table 8-ac1 should be changed into “VHT MRQ” and its meaning should be changed into “MFB request”.
    • The Unsolicited MFB’s meaning in table 8-ac1 should be changed into “Unsolicited MFB indicator”.
    • The MCS meaning in table 8-ac2 is changed into “Recommended MCS”.
    • NSTSshould be revised to N_STS in page 4 and should add a note for NSTS definition for its first time appearance

Slide 7

reference
Reference

[1] IEEE P802.11ac/D1.0: Wireless Medium Access Control (MAC) and physical layer(PHY) specifications: Enhancements for Very High Throughput for Operation in Bands below 6 GHz, 2011.

[2] IEEE P802.11n: Wireless LAN Medium Access Control MAC) and Physical Layer (PHY) specifications: Enhancements for Higher Throughput, Oct. 2009.

[3] 11-11-0276-17-00ac-tgac-d0-1-comments

Slide 8

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