PROFILE

A profile is a radio study that analyses the decrease of the radio-electrical signal in a line connecting a transmitter to a receiver. This calculation allows to verify whether there is sight between the transmitter and receiver, if first Fresnel zone is free of obstacles and the received signal level at all points of the path.

To carry out this type of study in Xirio Online it is necessary to configured the following parameters:

- Name: Name which identifies of the profile study.

- Service: Technology selected for the study. Xirio Online, depending on the selection of this parameter, proposes a series of radio parameters, by default, suitable for the calculation to be performed, although there is always the possibility to modify them.

- Band: Frequency band that will be used in the automatic frecuency assignment. Xirio Online will determine which frequencies are available for each link depending on the channeling of its band and will propose those frequencies that minimize interference with other elements of the study. The user can enter a set of restrictions on the use of certain frequencies in the band . With the option Forbidden channels, Xirio Online allows the users to select a set of frequencies that do not want to be assigned to any link.

- Description: Comments or information the user wants to add more information to provide.

- End 1: Transmitting station of the profile study. You can modify its parameters (location and radio parameters) by selecting the option . The following link provides more information about the transmitter. In bidirectional profiles it works as the receiver station in the reverse path.

- End 2: Receiving station of the profile study. You can modify its parameters (location and radio parameters) by selecting the option . The following link provides more information about the transmitter. In bidirectional profiles it works as the receiver station in the reverse path.

- Link parameters: In this window you can set up the specific parameters for the analysis of the profile.

- Calculation method: Algorithms to be used in the calculation of propagation losses. It can be modified by selecting the option . The following link provides more information about the compute method.

- Cartographic layers: This is a list of cartographic layers to be used in the calculation. To add or remove layers of the study you must access the mapping management window through the option . The following link provides more information about the cartographic layers.

Except for the transmitter and receiver, which must be placed by the user, the rest of the fields are loaded by default with typical values when the service or technology to simulate is selected in the tool and can be changed whenever desired.

In the case of the service of the profile study is mobile service (3ª or 4ª generation) will be available two more parameters in the "Calculation parameters" section:

- Path type: Tthe user can select whether to simulate the uplink path or downlink path.

- 4G parameters: Set of parameters that influence the signal propagation of these services. The details of these parameters can be found in this link.

There is a particular case for the profile study, in which specific calculations are performed to analyze the feasibility(calculations of quality and unavailability) of a microwave radio link for fixed service. To obtain such results on Xirio online, the user needs to choose a fixed service and the compute method proposed by Rec ITU-R F.530. With this configuration, will be available a new control called "Link Parameters" in section of "Equipments".

The results of a of digital hop study include different types of losses (free space, diffraction, reflections, rain attenuation, absorption by gases) and a estimation of the reception statistical in terms of reception quality of the link and unavailability.

Below is a screenshot of the display when the profile is ready to be calculated:

 

PROFILE STUDY ACTIONS

You can access the following options from the actions panel of the profile study:

- Modify study. From this option, you access the profile configuration window.

- Center viewer on study. Locates the selected profile on the Xirio Online viewer.

- Duplicate study. It makes a copy of the study.

- Orient antennas automatically. Modifies the azimuth and slope of the the transmitter and receiver antennas to ensure the maximum gain in the transmission direction.

- Free low-resolution calculation . This option performs a free calculation of the selected study. This type of calculation has some limitations. The following link provides more information about the free calculations on Xirio Online.

- High-resolution calculation . This option performs a high-resolution calculation of the selected study. A window appears detailing the calculation cost and the cartography before starting. The following link provides more information about payment calculations on Xirio Online.

- Delete study. Deletes the selected study, with all the radio elements, from the user's account.

- Close study. Closes the selected study and removes its result from the viewer.

PROFILE RESULT

To view the results it is necessary to access to the icon “open results” on the toolbar. This action will open a window with all the results of all the calculated studies. Once the user opens the desired one the caption will show that result hanging on the results folder, the same as studies are hanging on the studies folder. If the result of the profile is broken down entirely the following tree structure is obtained:

After the calculation of a profile three types of results ares obtained: profile graph, profile report and digital hop report. All of them can be open and downloaded.

- Profile graph. Graphic representation of the topographic profile including the direct ray, the Fresnel ellipsoid and the signal level (the last one only if the option "Calculate digital hop report" in the high--resolution calculation window is not checked).

 

 

- Profile report. It contains the height and the signal level received each 100 meters along the profile path for both the direct and reverse paths.

- Digital hop report. It contains all the information related to the viability of the radio link in case you have used the method of calculation proposed by Rec ITU-R F.530 (profile information, link budget and quality and unavailability results). If the digital hop is not viable, the report includes some recommendations to improve it.

 

Also, tThe line connecting the transmitting station and receiving station, in the Xirio Online viewer, becomes a result after carrying out a calculation, after identifying, by color code the different areas of visibility of the profile:

-- Clear trajectory (green color). The terrain or buildings don't obstruct neigther the direct ray nor the 60% of first fresnel ellipsoid.

- Semi clear trajectory (orange color). The terrain or buildings don't obstruct the direct ray, but the 60% of first fresnel ellipsoid is obstructed.

- Obstructed trajectory (red color). The terrain obstructs the direct ray.

 

 

 

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