Description
The main scenario of communication within the water transport system is the following (see Figure 1):
- 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 InfiMUX 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.
Figure 1 - Water transport
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 intersymbol interference (ISI) appears at the receiver side. To reduce the effect of the ISI, the guard interval between messages can be increased. The guard interval configuration can be configured on the InfiLINK 2x2 and InfiMAN 2x2 family devices with the TDMA software version by disabling the "short guard interval mode" parameter using the "rfconfig rf5.0 -shortgi" command and in Quanta 5 devices by increasing the "GI" parameter.
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 InfiMUX installed on the aggregation node;
- nomadic mode;
- MultiBS function enabled;
- Global function enabled.
Completed projects
The following projects were implemented by InfiNet in accordance with the above scenario: