User's Manual

BreezeCOMPACT System Manual
Chapter 3 - Operation and AdministrationBS Menu
Chapter 3 - Operation and Administration BS Menu
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3.7.2.8.1 Enable Keep Alive
Enable/disable the keep-alive mechanism. The default is Enable.
The following parameters are applicable only if Keep Alive is enabled.
3.7.2.8.2 Polling Period
The period in seconds between polling sessions.
The range is from 10 to 1000 seconds. The default is 60 seconds.
Polling Period x 1000 (value in milliseconds) cannot be lower than (Retransmissions Time Out) x (Number
of Retransmissions+1).
3.7.2.8.3 Number of Retransmissions
Maximum number of retries if Retransmission Timeout has expired without getting a response.
The range is from 0 (none) to 10. The default is 5.
3.7.2.8.4 Retransmissions Time Out
Time in milliseconds to wait for a response before initiating another polling attempt or reaching a
decision that the polled entity has failed (if the maximum number of retries set by Number of
Retransmissions has been reached).
The range is from 5000 to 10000 milliseconds (5 to 10 second). The default is 5000.
3.7.2.9 Scheduler
Scheduling uncommitted (above the maximum reserved rate) traffic can be done using one of the
following options:
 Equal Time (ET) scheduling mode, in which air resources are being scheduled in a fair manner
proportional to the users' excess traffic (maximum sustained rate - maximum reserved rate) SLAs.
 Equal Rate (ER) scheduling mode, in which air resources are allocated to users aiming at ensuring data
rate fairness between users proportional to their excess traffic SLAs.
Assuming a sector with diversity (different channels conditions) of active users, ET scheme enables
higher aggregate sector throughput at the expense of data-rate fairness among users, while ER
scheduling scheme ensures maximum data-rate fairness among users at the expense of lower aggregate
sector throughput.
Using ER scheduling scheme exposes the system to excessive allocation of air resources to highly active
users having relatively poorer channel conditions. To ensure data-rate fairness, more resources will to be
allocated to these users compared to users with relatively good channel conditions. The effect of a small
number of such users within the sector will be reflected by reduced aggregate sector throughput as well
as degradation of achievable rates for all users.
To protect against “abusing” users, an instantaneous rate threshold can be defined within the
scheduling scheme in which the amount of air resources for users with continuous instantaneous rate
below the threshold is being limited. The more the abusing users' instantaneous rate is below the
threshold, the more resource allocations limitation is applied.