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Configuration Guidelines
4-3
♦ Setting the CW min to 15 will improve performance for links with
uni-directional traffic patterns.
♦ CW min of 31 will minimize the PER for heavy bi-directional traffic loads.
♦ CW Min of 63 should be used for long-range multi-point links with more than 3
RBs.
RTS Threshold
The default value for the minimum packet size required for transmission of a
Request To Send message is 2347 bytes. Using this value will practically disable
the RTS/CTS mechanism, enabling high throughput in point-to-point links.
In point-to-multipoint applications with more than 3 RBs, a lower RTS Threshold
(e.g. 512 or even 60 bytes) should be used to reduce the effect of collisions. This is
especially critical in deployment with hidden stations, where one RB may not
“hear” another RB. In deployments with hidden stations the RTS Threshold must
be decreased to 60 bytes.
Basic Rate
The default value for the Basic Rate is 2 Mbps. In very good quality links a higher
basic rate could be used to increase throughput. As the quality of the link gets
poorer, the basic rate should be decreased to a rate where there is a very high
probability that all transmissions will be properly received.
Note that the basic rate cannot be increased above 2 Mbps if the cell includes
legacy units that do not support higher basic rates.
Range
A Range value that is too high may reduce throughput as it causes an inefficient
use of the available capacity by allowing an acknowledgement time-out that is too
high.
A Range value that is too low must be avoided as it may completely disable the
ability for proper communication by not allowing a sufficient acknowledgement
time-out.