Transport over the water⁣⁣⁣

Description

The main scenario of communication within the water transport system is the following:

• One or several BS sectors are installed in the seaport area. If the ship will cruise along a given water area, then BS sectors are installed along the coastal strip.

• BS sectors are joined into a single MINT via the AstraMUX installed on the aggregation node.

• One or more CPEs are installed on the ship. The antennas used depend on the project features.

• The aggregation node and the control center are connected via the main and backup backbone links.

The specific of such scenarios is the signal propagation path, since a part of the route is located above the water surface. The radio signal is reflected from the water surface, as a result an inter-symbol interference (ISI) appears at the receiver side. In order to overcome the ISI effects, the guard interval between the air frames should be increased. For increasing the guard interval on Evolution device disable the "short guard interval mode" parameter using the "-shortgi" command for the 40 and 80 MHz channels (if other channel sizes are used, the long guard interval is already in use and cannot be modified);

On devices of the Quanta families, the guard interval size is set automatically.

Rolling should also be taken into account in such projects. In order to maintain the position of the CPE relative to the BS, a roll compensation device with a gyroscopic function can be used.

Configuration

The following configuration is recommended for projects within the water transport system:

• join all the BS sectors into a single MINT area via the AstraMUX installed on the aggregation node;

• nomadic mode;

• MultiBS function enabled;

• Global function enabled.