[802.19] URGENT: Reasons to vote NO on the 11ax CAD
Hi All--
As I am sure you have all noticed, the 11ax CA document, now at revision
05, is up for ballot again. It can be found at:
https://mentor.ieee.org/802.11/dcn/16/11-16-1348-05-00ax-coexistence-assurance.docx.
Unfortunately, nothing has been done to correct the major deficiencies
which resulted in this CAD not being approved the last time
around.
Summary of comments on the 802.11ax Coexistence Assurance Document
- The CAD needs to list the
bands used by the amendment, and also list all other 802 wireless
standards that use the same bands.There's more than UWB to consider, too,
as there's been quite a lot that has changed in 2.4GHz and probably other
bands where 11ax and 15 overlap. These lists should be added as
well as including an analysis of impact and methods of avoiding
interference.
- The CAD assumes that the coexistence characteristics of 802.11ax are
the same as legacy 802.11 OFDM, addressing only where new features
would differ, however with the expansion of the channel plans into bands
previously not specified, the 'just like' assumption is no longer true
and the move into 6 GHz to 10 GHz is new. These deficiencies need
to corrected.
- The CAD does not discuss coexistence considerations in other than the
2.4 GHz and 5 GHz bands. In Clause 2 it explicitly says
"Therefore 802.11ax will be an enhancement to 802.11n in 2.4 GHz and
802.11ac in 5 GHz" which was accurate with the original project
scope but is not with the current project scope. A discussion and
analysis needs to added including methods of mediation where necessary
- The CAD should include analysis of coexistence with services based on
802.15.4 using the LRP and HRP UWB PHYs in all bands where 802.11ax and
802.15.4 UWB PHYs overlap.
- The CAD states that CCA (and CSMA) are the primary coexistence
mechanisms in 802.11. It does not describe how CCA will (or will not)
work with services based on 802.15.4 using the LRP and HRP UWB PHYs.
Analysis should be provided on CCA as a coexistence mechanism with UWB
systems.
- There has been considerable work done by 802.11 WG members on
coexistence with 3GPP. None of this good work is used or referenced
in the CAD; This would be good content for the CAD.
- The LMSC Operations Manual says "The CA document shall address
coexistence with all relevant approved IEEE 802 LMSC wireless standards
specifying devices for unlicensed operation. The WG should consider other
specifications in their identified target band(s) in the CA
document." The work on coexistence with LTE based services would
fall under this recommendation.
- This revised CA document does not address the matter of coexistence
with 802.15 ultra-wide band (UWB) radios in the 6 to 7 GHz band, or even
acknowledge the potential, (assuming the FCC regulations change to allow
the 11ax radio operate in this band) for the 11ax operation in this band
to disrupt these UWB radios operating in this band. By not even
mentioning any of the 802.15 standards specifying unlicensed UWB radios
for operation in the 6 to 7 GHz band, the CA document clearly is not
following the IEEE 802 LMSC OPERATIONS MANUAL requirement: "The CA
document shall address coexistence with all relevant approved IEEE 802
LMSC wireless standards specifying devices for unlicensed operation"
In its current state, the CA document does not fulfill its required
purpose, and as such I urge you all to do as I have done and that is to
vote DISAPPROVE on this ballot. The ballot can be found at
https://mentor.ieee.org/802.19/poll-vote?p=30900008&t=30900008
Thanks for your support in making this CAD a relevant and meaningful document.
Bob
Bob Heile, Ph.D
Chair, IEEE 802.15 Working Group on Wireless Specialty Networks
Chair IEEE 2030.5 Working Group for Smart Energy Profile 2
Co-Chair IEEE P2030 Task Force 3 on Smartgrid Communications
11 Robert Toner Blvd, Suite 5-301
North Attleboro, MA 02763 USA
Mobile: +1-781-929-4832
email: bheile@xxxxxxxx
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