User's Manual

Table Of Contents

Ις.

Link setup

1. Preliminary decisions

Bitrate selection

Overall link performance is greatly depends on the right bitrate selection. Wrong

bitrate of a radio link in most cases lowers its performance characteristics. In the

result subscribers are getting bad services.

IW MINT architecture makes bitrate selection process fully automatic. Using IW

proprietary Link Forecasting and Active Testing algorithms MINT chooses the

optimal radio transmission rate individually for each connected subscriber device.

• Therefore, main recommendations for bitrate selection are:

enable autobitrate mechanism and set the maximal available

bitrate on the radio interfaces of all the devices

• To estimate the real bitrate of the device prior to its installation

and deployment use the Range Calculator utility (see below).

Frequency planning for multi-sectored Base Stations

Base Stations with six sectors deliver the maximal performance by providing with

sector reciprocal reservation and best price/performance parameter value. When

having an optimal frequency gap of 40 MHz between adjacent sectors of the BS,

the following schemes are recommended to be configured (e.g. having 5

available in configuration frequencies F1, F2 … F5):

• F1, F3, F5, F1, F3, F5

• F1, F3, F1, F3, F1, F3

Transmitting power selection

High output power correlates with the maximal connection performance.

Decreasing the output power is logical when the maximal bitrate is already

reached and there are no repeats. In this case excessive output power can

decrease the system parameters. When having no built-in or external amplifiers

one can try to install the automatic power control for the subscriber.

Range| Bitrate calculation

Range/Bitrate calculator allows estimation of a bitrate and distance for a

particular radio link. This calculator can be downloaded from “Repository” of our

support web-site (http://support.infinetwireless.com