Bst/Au Id Parameters Menu - Alvarion BreezeMAX PRO-S CPE Product Manual

Chapter 4 - Operation
4.6

BST/AU ID Parameters Menu

Each AU/Micro Base Station (logical sector) in the network is configured with a
unique ID comprising an Operator ID, Cell ID and Sector ID. The BST/AU ID
parameters in the SU define the Micro Base Station(s)/AU(s) that can synchronize
with the SU. These parameters include the base BST/AU ID and the BST/AU ID
Mask. The SU can synchronize only with AUs/Micro Base Stations whose Base
Station ID is included in the IDs range defined by the applicable parameters in the
SU.
The quest for load sharing together with the desire to create best throughput
conditions for the SU created the need for the Best BST/AU feature, to enable an
SU to connect to the best Micro Base Station/AU in its neighborhood.
The SU scans all Micro Base Stations/AUs in a predefined range, using all defined
scanning frequencies (see
the devices with which the SU can communicate (perform initial phase of network
entry) is given a quality mark based on the quality of the signal at which it is
received by the SU. At the end of the scanning period, the SU reaches a Best
BST/AU decision according to the information gathered. The Micro Base
Station/AU with the highest quality mark is selected as the Best BST/AU, and the
SU will immediately try to associate with it at the relevant frequency.
The range used for scanning is defined by the BST/AU ID and BST/AU ID Mask
parameters. The initial range can be limited by defining a preferred range of
BST/AUs, and selecting the best BST/AU in the preferred range. If no device is
found in the preferred range, the SU will scan the entire range.
A Mobility Mode parameter enables supporting optimal performance after loosing
connectivity to the AU according to the expected mobility of the SU: A Mobile SU is
expected to move among different AU, while a Nomadic SU is typically stationary
although it may also be moved to the coverage area of a different AU.
If a Nomadic SU loses communication with the best BST/AU, it will continue
searhing for it for 5 minutes. If not found within 5 minutes, the SU initiate a short
scan and try to associate with the second BST/AU in the of Best BST/AU Table
and so on, checking all the BSTs/AUs in the table, and trying to associate with
the best one. If no BST/AU from the table is found, the Best BSTs/AUs table will
be deleted and the SU will initiate a Full Scan (all defined scanning frequencies
and all BSTs/AUs in the defined range).
The same process will be executed also for a Mobile SU, with one exception: The
SU will search for the BST/AU to which it was previously connected only for 100
milliseconds to allow daster association with a new AU.
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"Frequency Scanning Parameters" on page 94). Each of
BreezeMAX CPEs Product Manual