The controllercompares whether or not an AP has more clients than its neighboring APs on other channels. If an
AP’s client load is at or o ver a predeterminedthreshold as compared to it s immediate neighbors, or if a neighboring
Dell AP on another channeldoes not have any clients, load balancingwill be enabled on that AP.
Whenan AP has the spectrumload balancing feature enabled, the AP will send an association response with error
code 17 to new clients tryingt o associate. If the clientreceiving the error code tries to associate to the AP a second
time, it will be admitted. If a c lient is rejected by two A Ps in a row, it wi llbe admittedby any AP on its third try.
Note that the load balancingfeature only affects the associatio no fnew clients; this feature does not reject or
attempt to balance clientsthat are already associated to the AP.
Spectrumload balancing is disabled by default, and can be enabled for 2.4G traffic through an 802.11g profile or for
5G traffic throughan 8 02.11a RF management profile. The spectrumload balancing feature also requires that the
802.11a or 802.11g RF managementprofiles reference an ARM profile with ARM scanning enabled.
NOTE:The spectrum load bal ancing featureavail able in ArubaOS 3.4.x and later releasescom pletely replaces the
APload bal ancing feature available earlier versions of ArubaOS. When you upgrade to ArubaOS3.4.x or later, you must manuall y
configurethe spectrum load balanci ng settings,as the AP load balancing feature can no longer be used, and any previous AP load
balancing settingswi ll not be preserved.
For details on modifying 802.11a or 8 02.11g RF management profiles, referto "Workingwith Mesh High
ThroughputSSID P rofiles" o n page4 55 .
Reusing Chann els to Control RX Sensitivity Tun ing
In some densedeployments, it is possi blefor APs to hearother APs o nthe same channel. This creates co-channel
interferenceand reduces the overall usageof the channel in a given area. Channelreuse enables dynamic control over
the receive (Rx) sensitivity in order to improve spatial reuse of the channel.
NOTE:The channel reusefeature applies to non-DFS channels only. It is internall y disabled for DFS channels and is does not affect
DFSradar signature detection.
You can configurethe channel reuse featureto operate in eithero f thefollowing three modes;

static, dynamicor

disable

. (This featurei s disabled by default.)
lStatic mode: This mode of operation is a coverage-based adaptation of the Clear Channel Assessment (CCA)
thresholds.In the stati c mode of operation, theC CA is adjusted according to the configuredt ransmission power
levelon the AP ,s o as the AP transmit power decreases as the CCA threshold increases,and vice versa.
lDynamic mode: In this mode, the Clear Channel Assessment (CCA) thresholds are based on channel loads,and
take into account the location of the associated clients. When you set the ChannelR eusefeature to dynamic
mode, this featureis automatically enabledwhen the wireless medium aroundt heA P is busy greater thanhalf the
time, and the CCA thresholdadjusts t o accommodate transmissions between the AP its most distant asso ciated
client.
lDisable mode: This mode does not support the tuningo ft heCCA Detect Threshold.
The channelreuse mode is co nfiguredthrough an 802.11a o r 802.11g RF management profile. For details on
modifying 802.11a or 802.11 g RF management profiles,refer to “Mesh High-Throughput SSID Profiles” on
page465.
Configuring Non-80 2.11 for Noise Interferenc e Immunity
Whenan AP attempts to decode a non-802.11 signal, that attempt can momentarily interruptit s ability to receive
traffic.T he noise immunity feature can help improve network performancein environments with ahigh level of non-
DellPowerConnect W- Series ArubaOS 6.2 | UserGuide AdaptiveRadio Management (ARM) | 360