Users Guide

452| Adaptive Radio Management Dell Networking W-Series ArubaOS 6.5.x| User Guide
radio, as long as the 5 Ghz RSSI is not significantly worse than the 2.4 GHz RSSI, and the APretains a
suitable distribution of clients on each of it's radios.
The client match feature is enabled through the AP's ARM profile. Although default client match settings are
recommended for most users, advanced client match settings can be configured using rf arm-profile commands in
the command-line interface.
BSS Transition Management Support
The BSS Transition Management Support feature allows Client Match to steer devices using 802.11v BSS
transition management standards for continuous wireless connectivity. This feature provides a seamless
standards compatible method of device steering in wireless networks, as 802.11v BSS transition management
support has become increasingly common in wireless devices.
Steering a Client
When Client Match attempts to steer the client to a more optimal AP, it sends out an 802.11v BSS transition
management request to the 11v capable station and waits for a response.
1. Client Match begins a timeout session for the BSS transition management response or new association
request to the desired AP.
2. If the request is rejected or the timeout session expires, Client Match is notified of the failed attempt and
reinitiates the steer using the 802.11v BSS transition management request.
n If the client steer fails the maximum number of timeout attempts (default: 5), Client Match marks the
client as 11v unsupported and falls back to using deauths to steer.
n If the client steer fails due to request rejection, Client Match does not mark the client as 11v
unsupported and continues to attempt to steer using the 802.11v BSS transition management request.
Multi-Media Sync-Up
Client Match offers a tighter integration with multiple media-aware ALGs to provide better call quality for
programs like Skype for Business (Skype4b) and Facetime. With Client Match’s ability to understand various
media protocols, clients are not steered to different APs in the middle of an active media session.
When a client participates in a call, the controller learns about the media session and sends this information to
the AP that the client is currently associated to, as part of the variable bitrate (VBR) update. When the AP learns
that the client is in a call, it will not attempt to steer the client to another AP until the controller indicates that
the call has ended, allowing calls to run more smoothly without any disruptions to the ongoing media flow.
Multi-User MIMOSteering
Multi-user MIMO, or MU-MIMO Steering, groups multi-user-capable (MU-capable) clients to maximize the
likelihood of MIMO transmissions, which increases downstream throughput performance in 802.11ac Wave 2
(gen 2) APs. MU-MIMO runs on MU-capable clients with traffic flows and PHY channels compatible for multi-
user transmissions. Client Match steers and aligns MU-MIMO-capable clients with MU-MIMO-capable radios
using SNR values. Multiple MU-MIMO-capable clients can be grouped together on a MU-MIMO-capable radio.
Successful MU-MIMO transmissions depend on the following:
l Traffic streams that can be multiplexed for MIMO transmissions. This is dependent on packet length and
traffic flow rates (packet arrival rates) from APs to the devices.
l MU-MIMO-capable clients associated to the same radio, whose PHY channel matrices are compatible for
simultaneous multi-user transmissions