User's Manual Part 2

BreezeCOMPACT System Manual
Chapter 4 - Operation and AdministrationBS Menu
Chapter 4 - Operation and Administration BS Menu
121
 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.
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.
The Scheduler menu enables viewing/updating the values configured for the following parameters:
 Scheduler Mode
 Scheduler DL Abuse Protection Level
 Scheduler UL Abuse Protection Level
4.7.2.9.1 Scheduler Mode
The basis for allocating excess bandwidth among relevant users:
 Equal Rate: Throughput Fairness
 Equal Time: Resource Fairness
The selected mode is applicable for both uplink and downlink schedulers.