System Manual
BreezeCOMPACT System Manual
Chapter 1: System Description
BreezeCOMPACT Features
37
1.5.5
Equal Rate Scheduling
The Equal Rate scheduler attempts to deliver the same bit rate to all UEs provisioned that have
the same GBR/MBR/AMBR. When UEs have different radio link conditions, the low modulation
CPEs consume more air resource than the good modulation CPEs, in order to reach bit-rate
fairness, as shown below:
Figure 17: Equal Rate Scheduling
The Equal Rate scheme delivers rates that are proportional to the provisioning of
GBR/MBR/AMBR.
In Release 6.8, a new protection mechanism for Equal Rate was introduced to limit the
consumption of air resources by CPEs in poor radio conditions.
1.5.5.1
Equal Time Scheduling
The Equal Time scheduler attempts to deliver the same air resources to all UEs provisioned that
have the same MBR. When UEs have different radio link conditions, lower-modulation CPEs get
a lower bit rate than good-modulation CPEs, as shown below:
Figure 18: Equal Time Scheduling
The Equal Time scheme delivers rates that are proportional to the provisioning of MBR/AMBR.
1.5.5.2
Scheduling Schemes and QCI Mapping
The BreezeCOMPACT scheduler behavior for GBR/Non-GBR QCIs works as follows:
Guaranteed bit rate service (QCI 1–4):
GBR (Committed):
Schedule D with Equal Rate
MBR Minus GBR (Uncommitted Portion):
Scheduled either using Equal
Time/Equal Rate (based on user provisioning)
Non-guaranteed bit rate (QCI 5–9):
UE-AMBR:
Scheduled either with Equal Time/Equal Rate (based on user
provisioning)