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.
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.
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.
The meaning of MCS subfield in table 8-ac2 should be the Recommended MCS, not the Recommended MCS feedback, the word "feedback" is redundant.
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:
 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.
 IEEE P802.11n: Wireless LAN Medium Access Control MAC) and Physical Layer (PHY) specifications: Enhancements for Higher Throughput, Oct. 2009.