User Manual

Chapter 3 - Operation and Administration of the Macro BTS Managing BSs
4Motion 635 System Manual
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.
Three levels of dynamic protection are available:
 No protection.
 Low protection level - protection against users with very poor channel
conditions. Should be used where the abusing users instantaneous rates are
far below the average instantaneous rate within the sector.
 Medium protection - protection against users with relatively poor or very poor
channel conditions. Should be used where the abusing users instantaneous
rates are below or far below the average instantaneous rate within sector.
A dynamic protection mechanism is implemented, in which the mechanism of
limiting resource allocations is automatically and dynamically activated when
needed.
After enabling the BS configuration mode, you can execute the following tasks:
 Configure one or more of the Scheduler parameters (refer to Section 3.9.24.1).
 Restore the default values of some or all of the Scheduler parameters (refer to
Section 3.9.24.2).
You can display configuration and status information for the Scheduler
parameters of a selected or all existing BSs (refer to Section 3.9.24.3).