User's Manual

Table Of Contents
168 Operation
Chapter 4 - Operation and Administration
The Multirate menu enables viewing/updating the following parameters:
4.9.5.3.4.1 Multirate Enable/Disable
The Multirate Enable/Disable parameter controls whether the multirate algorithm
should be used to determine current optimal rates in both the uplinks and the
downlinks.
The default is Enable.
4.9.5.3.4.2 Uplink Basic Rate
The Uplink Basic Rate is the minimum rate to be used by the Multirate algorithm
in all uplinks. This is also the rate to be used by SUs for non-scheduled
transmissions, such as during the contention period.
The Uplink Basic Rate is also the initial rate to be used by the algorithm for each
new SU that joins the cell when the Multirate algorithm is enabled.
The default rate is the lowest rate BPSK 1/2 (rate 1).
Table 4-6: Rates (Modulation Schemes and Coding)
No. Rate
1 BPSK 1/2
2 BPSK 3/4 (not applicable for TDD systems)
3 QPSK 1/2
4 QPSK 3/4
5 QAM16 1/2
6 QAM16 3/4
7QAM64 2/3
8 QAM64 3/4
NOTE
Rate 2 (BPSK 3/4) is not applicable to systems operating in TDD mode..
NOTE
The multirate algorithm should always be enabled. The option to disable it is available to enable
using a fixed rate to support certain tests. After each reset, the AU boots with the multirate enabled,
disregarding its status before the device was reset.