1. Comments Clarification on VHT Operation Notes and VHT Action Field
January 2010
2019/4/24June 2010
doc.: IEEE /xxxxr0
doc.: IEEE /0084r3
Comments Clarification on VHT Operation Notes and VHT Action Field
Date:
Authors:
Page 1
Xie Gang, Cisco Systems
Xie Gang, Cisco Systems
, Cisco Systems

2. 2019/4/24June 2010
doc.: IEEE /xxxxr0
Introduction
This presentation is comments clarification on VHT Operation notes and VHT Action field in Draft P802.11ac_D1.0.
Currently, the notes of VHT Operation has changed into “The VHT Operation element is present when the dot11VHTOptionImplemented attribute is true” .
But we think this “notes” in table 8-19 et al doesn’t satisfy the requirement, and we propose our revise advice.
And the length of VHT Action field is one octet, so the value of should be clarified.
Xie Gang, Cisco Systems
Xie Gang, Cisco Systems

3. VHT Operation Notes Problem Statement(1)
As in the document 11/276r17 CID1810 shows that the notes of VHT Operation is “The VHT Operation element is present when the dot11VHTOptionImplemented attribute is true” .
And apply to Tables 8-19, 8-22, 8-24 and 8-26 in Draft P802.11ac_D1.0.
According to the context of the P802.11ac_D1.0, we think this “notes” doesn’t satisfy the requirement, and should be changed to fit the point.

4. VHT Operation Notes Problem Statement(2)
As the paragraph Semantics of the service primitive in Draft P802.11ac_D1.0 describes the VHT Operation parameter : “The parameter is present if BSSType = INFRASTRUCTURE and dot11VHTOptionImplemented is true; otherwise, this parameter is not present”.
So we conclude that the VHT Operation parameter is present need two conditions.
And we should consider the type of BSS when give the notes of VHT operation, and the notes of the VHT operation in Draft P802.11ac_D1.0 doesn’t satisfy this requirement.

5. Recommended changes for VHT Operation Notes
Considering one of the condition “BSSType = INFRASTRUCTURE ”, we propose our revise advice:
The notes of VHT Operation should be changed into “The VHT Operation element is included by an AP when dot11VHTOptionImplemented attribute is true”.
And apply to Tables 8-19, 8-22, 8-24 and 8-26 in new Draft of ac.
Our revise advice refers to the notes of HT Operation in n-2009.

6. Proposed Changes to the P802.11ac_D0.1 Text
After the amendment: Table 8-19—Beacon frame body, Table 8-22—Association Response frame body, Table 8-24—Reassociation Response frame body, Table 8-26—Probe Response frame body.
Order
Information
Notes
VHT Operation
The VHT Operation element is included by an AP when dot11VHTOptionImplemented attribute is true

7. VHT Action Field Problem Statement and Recommended changes
The length of VHT Action field is one octet, so the value of should be clarified. But the VHT Action field values in Draft P802.11ac_D1.0 only give the value of 0-2.
Insert a row in the Table 8-ac16—VHT Action field values in Draft P802.11ac_D1.0.
After the amendment: Table 8-ac16—VHT Action field values
Value
Meaning
VHT Compressed Beamforming 1
Group ID Management 2
VHT Operating Mode Notification
3-255
Reserved

8. Summary The problems are:
VHT Operation notes aren’t satisfied the requirement.
The value of VHT Action field should be clarified.
This presentation provides the solutions to the problems:
The notes of VHT Operation change into “The VHT Operation element is included by an AP when dot11VHTOptionImplemented attribute is true”.
Insert a row in the Table 8-ac16—VHT Action field values in Draft P802.11ac_D1.0. Add value should be reserved.

9. 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
[3] ac-tgac-d0-1-comments