User's Manual

2-34
BreezeACCESS 4.0 Operations and Administration
Manual Revision: 1.01
Operator ESSID. The ESSID as well as the Operator ESSID are
included in the AU’s Beacon & Probe Response management frames.
The SU shall regard such frames if the ESSID or Operator ESSID
matches its own ESSID. The ESSID of the AU with which the SU is
associated is defined as the Run-Time ESSID, to be used by the SU
when communicating with the AU. The Run-Time ESSID is included
in the list displayed upon selecting either Show Air Interface
Parameters or Show Basic Parameters options in the SU.
In new installations where all units are configured with the same
ESSID, Operator ESSID need not be used.
The following parameters are available:
" Operator ESSID Option – Enables/disables the use of the
Operator ESSID when communicating with SUs.
The default is Enable.
" Operator ESSID – Defines the Operator ESSID.
Valid values: a string of up to 31 printable ASCII characters,
case sensitive.
The default value is ESSID1.
Best AU Selection Parameters
In BreezeACCESS systems with software version 3.0 and below an SU
can associate with any AU it can communicate with, provided they both
use the same ESSID. An SU that can communicate with more than one
AU using the same ESSID becomes associated with the first AU it
“finds”, not necessarily the best choice in terms of quality of
communication or other factors such as number of SUs serviced by
each AU. The same limitation also exists if only one AU in the
neighborhood has an ESSID identical to the one used by the SU, since it
is not always necessarily the best choice.
The topology of a fixed access network is constantly changing. Changes
in base station deployment and subscriber density can accumulate to
create substantial changes in SU performance. The quest for load
sharing together with the desire to create best throughput conditions for
the SU created the need for the Best AU feature, to enable a SU to
connect to the best AU in its neighborhood.
When the Best AU feature is used, each of the AUs are given a quality
mark based on the level at which it is received by the SU. The SU scans
for a configured number of cycles, gathering information from all the
AUs it can communicate with. At the end of the scanning period, the SU
reachs 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.