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).

To use the calculator:

1. Set needed frequency range in “Band” field.
2. Set NLOS parameters in “Path type” field.
3. Set radio channel width in “Bandwidth” field.
4. For Site 1 and Site 2 define device model, device’s max output, antenna gain and feeder loss.
5. Press “Calculate” button.

The results will be listed in a table below. For each available Bitrate value you will see corresponding distances in kilometers for “worst”, “mean” and “optimal” environment conditions.