Alvarion BreezeAccess II System Manual page 186

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AUs it can communicate with. At the end of the scanning period, the SU
reaches a Best AU decision according to the information gathered. The
AU with the highest quality mark is selected as the Best AU, and the SU
will immediately try to associate with it.
The quality mark given to each AU depends on the level at which it is
received by the SU.
The Best AU selection mechanism can be overridden by defining a
specific AU as the preferred AU.
NOTE:
Although the SU selects the Best AU based on long-term conditions prior to the decision
time, it may not always be connected to the instantaneous Best AU at any given time.
Note also that the decision is done only once during the scanning interval. The decision
may not remain the optimal one for ever. If there are significant changes in deployment
of neighboring AUs and the SUs served by them, overall performance may be improved
if the applicable SUs are reset intentionally so as to re-initiate the Best AU decision
process.
! Best AU Parameters in SU
" Best AU Support – Enables or disables the Best AU selection
feature.
The default is Disable.
NOTE:
If the Best AU feature is not used, the SU associates with the first AU it finds
whose ESSID or Operator ESSID is identical to its own ESSID.
" Number of Scanning Attempts – Defines the number of
scanning cycles to be used for gathering information on
neighboring AUs. A higher number may result in a better
decision at the cost of an increased scanning time during which
the SU is not operational.
Valid values: 1 - 255.
Default value: 20.
The scanning time can be calculated based on the following
formula:
Scanning Time (seconds) = N * C * 0.019
N = Number of scanning attempts
C = Number of channels in the hopping sequence
0.019 seconds is the time spent on each channel (dwell time)
while in scanning mode.
Manual Revision: 1.0
BreezeACCESS Version 4.5 Operations and Administration