TRANSPORT NETWORK PLANNING

 

The generic process of planning a transport network includes one or more basic steps towards establishing a Nominal Network Plan.

A Nominal Network Plan establishes sites location , configuration and height of antennas, and the configuration of the equipments involved in the network, considering its quality and availability , total and individual, and the limitations due to interference between the members of the network itself or interference caused by others.

All the parameters Xirio Online sets by default are sufficient to reach this stage of planning.

The basic steps for a Nominal Network Plan are:

 

1. Needs Analysis - Configuration

The planner must be clear, in a preliminary stage to the planning process, what sites are needed to be communicated, how information is needed to carry, and with what level of quality and availability.

In addition, further information should be collected such as:

- Basic Cartography we are going to work with: If the transport network goes through rural areas we will simply need to use a DTM (Digital Terrain Model) with a resolution of 25 to 100 meters, while if the network goes through urban areas, we should use a DEM (Digital Elevation Model, which adds to the MDT the height of buildings) with a much higher resolution.

- Calculation Method to use, which both in the Profile study or in the Transport Nerwork study, in Xirio online is the one contained in Recommendation ITU-R P.530-13.

- Technical specifications of equipment and antennas.

- List of known sites, those who already have infrastructure, or those who may shelter it.

 

2. Choice of locations - Visibility

The first thing to do is to determine which sites are to be used for our transport network , making sure there is visibility between the ends of each hop , with c lear trajectory . This verification can be performed concurrently with all the hops of the network, by using the Calculation of the intervisibility matrix in the Transport network study, or individually, hop to hop, by calculating the Profile without clicking the Calculate digital hop report option or by using the utility calculate profile.

 

3. Parametrisation of stations

In this phase are characterized general parameters of the installation to be done at each end of each hop, that is: height, orientation and size of antenna, need of space or frequency diversity and its characterization, frequency band, etc.

Importantly, in Xirio Online, there is no concept of radio station. By contrast, there is the concept of location as the geographic location of infrastructure, and the concept of transmitter as an element related to an antenna and capable of emitting electromagnetic waves.

Obviously, on the same site there can be multiple transmitters / receivers, but each end of a hop shall be set independently, although it coincides in location with others.

 

4. Network Planning

If our work is limited to connecting two sites between which there is visibility, our work can be completed with the completion of the above tasks. However, if our purpose of transport involves several hops, our work is not finished until we verify that the frequencies assigned to each hop and in each direction, do not cause interference between members of the network itself or to others.

Within the Transport Network study, when performing Calculate the transport network, if you want to calculate interference you should enable the option Consider interference in calculations.

This calculation provides, on one hand, possible incompatibilities between hops, due to interferences, which are summarized in the Summary report, and on the other hand, a detailed Interference report for each profile. This last report, for each path, direct and reverse, lists all the interfering power levels present at each end of the hops, at each end, interferent and interfered.

 

 

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