User's Manual

Chapter 4 - Operation and Administration BS Menu
BreezeMAX Extreme 142 System Manual
availability. The algorithm provides independent adaptation per MS, and it is
performed independently for UL and DL, based on link quality information. The
algorithm provides dynamic adaptation - modulation can be changed on a per
burst basis.
The Multi Rate submenu enables viewing/updating the following parameters:
 Uplink Multi Rate Support
 Uplink Basic Rate
 Uplink Fade Margin
 Downlink Multi Rate Support
 Downlink Basic Rate
 Downlink Fade Margin
4.8.2.2.4.1 UL Minimum Sub-Channels
The minimum number of sub-channels to be used by the uplink rate adaptation
mechanism. At each rate, the mechanism will move from the highest supported
number of sub-channels (35 for 10 MHz bandwidth, 17 for 5 MHz bandwidth)
down to the value of this parameter before reaching a decision to switch to a lower
rate. In the other direction, the mechanism will start at this value and move up to
the highest supported number of sub-channels before reaching a decision to
switch to a higher rate.
The range is from 1 to 17 for a 5 MHz bandwidth and from 1 to 35 for a 10 MHz
bandwidth.
The default is 4 sub-channels.
4.8.2.2.4.2 Uplink Multi Rate Support
Defines whether the multi rate algorithm will be used in the uplink. Under normal
operating conditions the Uplink Multi Rate Support should always be enabled.The
option to disable it is provided primarily for testing purposes.
The default is Enable.
4.8.2.2.4.3 Uplink Basic Rate
When Uplink Multi Rate Support is enabled, the Uplink Basic Rate defines the
lowest rate that can be used by the multi rate algorithm in the uplink. MSs that
cannot communicate with the BS at this rate will not be served. This can be used