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DRM - Dynamic Radio Management
Summit WM20 Technical Reference Guide, Software Version 4.294
● DRM Shaped Power control will adjust the cell size when new APs are brought online or
removed from service
● DRM Shaped Power Control minimizes the co-channel interference between APs.
DRM Automatic Channel Selection
When DRM is enabled for both the Summit WM Controller and for a specific AP then the access point
may then participate in a dynamic channel selection procedure. If a radio within the AP is configured to
use a channel called ‘auto’ then the automatic channel selection procedure occurs under the following
conditions:
● At boot time of the AP,
● When DRM is enabled globally for the system,
● When DRM is enabled for a specific AP, and
● When the ‘ReSync DRM’ button is selected from the UI.
The DRM channel selection algorithm automatically selects channels to minimize interference and
optimize performance. The algorithm requires no central authority and works equally well in both
sparse and dense deployments. DRM devices work in concert with each other selecting the best possible
channel and cell size for any environment.
The DRM channel selection algorithm has the following properties
● fully distributed
● requires no central authority
● scales infinitely
● Accounts for non-DRM devices as well as DRM devices
● Compliant to all 802.11 standards
● Requires no connections between APs (i.e. only the APs that can hear each other participate in the
process)
The channel selection process has several phases:
● Scanning (localized site survey)
● Selection (pick the best channel)
● Negotiate (request to operate on the selected channel)
● Operate (begin operation on the channel selected)
Scanning Phase
During the scanning phase, each AP scans all of the channels available in the regulatory domain. The
APs search for other APs already operating on the channel, determine their signal strength, and locate
other sources of non-802.11 interference. This information is used to determine the best channel for this
AP to operate on.