1. Cisco Wireless LAN Controller Configuration Guide
Release 8.5
"Configuring QoS" Chapter
"Configuring QoS per WLAN (GUI)" section. This document states
"From the WMM Policy drop-down list
choose... Required—Clients must support WMM. Clients that do not support WMM are not allowed to associate with the WLAN." This confirms the mandatory nature of WMM support.
2. Cisco Enterprise Mobility 8.5 Design Guide
"Voice over WLAN Design and Deployment Recommendations" Chapter
"QoS for VoWLAN" section. This guide clarifies the relationship between the standards: "WMM is a certification by the Wi-Fi Alliance of a subset of the IEEE 802.11e amendment... Cisco recommends that you configure the voice WLAN for Wi-Fi Multimedia (WMM) and configure the QoS profile to Platinum." This directly links the Platinum profile
WMM
and the underlying 802.11e standard as essential for VoWLAN.
3. IEEE Std 800-4302.11™-2020
"IEEE Standard for Information Technology—Telecommunications and information exchange between systems Local and metropolitan area networks—Specific requirements - Part 11: Wireless LAN Medium Access Control (MAC) and Physical Layer (PHY) Specifications
" Clause 9.4.2.57 "WMM/WME Parameter Element". This section of the official standard defines the WMM Information Element that WMM-capable stations (clients) use to advertise their QoS capabilities
which is a requirement for associating with a WMM-enabled AP.