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Comments Clarification on VHT Operation Notes and VHT Action Field

This presentation provides clarification and proposed changes to the VHT Operation notes and VHT Action field in Draft P802.11ac_D1.0, including solving the problem of unsatisfactory notes and clarifying the value range of the VHT Action field.

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Comments Clarification on VHT Operation Notes and VHT Action Field

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  1. Comments Clarification on VHT Operation Notes and VHT Action Field Authors: Date: 2011-06-24

  2. 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 0-255 should be clarified.

  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 6.3.11.2.2 Semantics of the service primitive in Draft P802.11ac_D1.0 describes the VHT Operation parameter : “The parameter is presentif 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 802.11ac. • Our revise advice refers to the notes of HT Operation in 802.11n-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.

  7. VHT Action Field Problem Statement and Recommended changes • The length of VHT Action field is one octet, so the value of 0-255 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

  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 3-255 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. 2009. [3] 11-11-0276-17-00ac-tgac-d0-1-comments

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