--- This message came from the IEEE 802.11 Task Group M Technical Reflector ---
From: Jon Rosdahl [mailto:jrosdahl@xxxxxxxx]
Sent: Wednesday, October 20, 2021
8:19 AM
To:
STDS-802-11-TGM@xxxxxxxxxxxxxxxxx
Subject: [STDS-802-11-TGM] [GEN
AdHoc] - CID 97 - basic rate set: and basic modulation and coding scheme (MCS)
set: definiition
--- This message came from the IEEE 802.11 Task Group M Technical
Reflector ---
Thanks to Sean Coffey for the heavy lifting on this
CID. After reviewing with others, I wanted to put this to the full TG for
consideration.
Background Discussion from Sean:
Discussion:
A definition of the basic rate set (and ditto basic MCS set) is indeed needed,
as currently the meaning is not explicitly defined. There are several
points to be clear on:
The basic rate set is selected at BSS start (that is the only place
where it can be passed over the MLME SAP) and hence is fixed for the lifetime
of the BSS
All STAs in the BSS are expected to support tx and rx of all
rates in the basic rate set (though for Class 2 STAs this might not in fact be
the case)
There are requirements on APs and PCPs to deny association to
STAs that don’t declare support for all the rates in the basic rate set (11.3.5.3/5), and ditto mesh STAs to deny mesh
peering (10.6.4 and 14.3.6.2)
The basic rate set is independent
of the mandatory rates for the PHY of the STA that started the BSS (this is
already specified). Similarly, the operational rate set, already defined
as “[the] set of data rates that a station (STA) is capable of receiving”, is
independent of the mandatory rates of the STA
[RR] If by “the STA” what is meant is “the STA connected to
the BSS”, then it is hard to imagine this is true. In this case, what is
obviously true is that the mandatory rates are a subset or a proper subset of
the operational rates. This should be clarified.
I have put the proposed resolution for CID 97 into the
AdHoc Notes.
Proposed Resolution: Revised;
Add the following definitions in 3.2:
basic modulation and coding scheme (MCS) set: A set of MCSs designated by the
station (STA) that started the basic service set (BSS) and fixed for the
lifetime of the BSS. The basic MCS set is typically advertised in the physical
layer (PHY) operation element(s), e.g. HT and VHT Operation elements. All
STAs in a BSS are capable of, or have signaled that they are capable of,
receiving and transmitting at all MCSs in the basic MCS set.
basic rate set: A set of data rates designated by the station (STA) that
started the basic service set (BSS) and fixed for the lifetime of the BSS. The
basic rate set is advertised in the Supported Rates and BSS Membership
Selectors element and, if present, the Extended Supported Rates and BSS
Membership Selectors element. All STAs in a BSS are capable of, or have
signaled that they are capable of, receiving and transmitting at all rates in
the basic rate set.
I have marked CID 97 as Review -
we can discuss it on the Oct 29th Telecon (Thanks Michael for assigning an
Agenda Time).
I will note that the original
definitions from Sean had an extra sentence that has been removed as not
necessary to the definition.
-----------------------------------------------------------------------------
Jon Rosdahl
Engineer, Senior Staff
IEEE 802 Executive Secretary
Qualcomm Technologies, Inc.
office: 801-492-4023
10871 North 5750 West
cell: 801-376-6435
Highland,
UT 84003
A Job is only necessary to eat!
A Family is necessary to be happy!!
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