Plataformas de coordinación con la institucionalidad del sica

This lets you use scanner data to optimize neighbor lists for sites within a user- defined radius (Maximum Intersite Distance) of the selected cell.

Where the serving cell cannot carry a call due to interference or poor radio conditions, the call needs to be moved to a better cell.

If the cellrefs file contains neighbor information, the analysis examines the relationship between the existing neighbors and the potential neighbors as seen by the scanner, and generates add, remove and retain recommendations for each site and cell.

You can export the suggestions made by the analysis directly to a CSV file for easy import and to update the switch directly.

7.10.1 Before you start

You will need to have loaded a suitable GSM scanner stream.

7.10.2 Using the neighbor list analysis

1 To start this analysis, from the Summary Dashboard page, click on the Radio Network Explorer button and click on this tab, or click on an appropriate link in the left-hand Issues panel.

2 If you have not done so before, check the data settings that control the neighbor list analysis algorithm. In this example, we will be interested in the Minimum Samples and the Addition Threshold. If you alter a data setting, the analysis will immediately update.

3 Sort the top table by the Add column.

You can now see the sector with the highest number of recommended additions to its neighbor list. Check that the Server Count column shows an acceptable value (you can also define a cutoff threshold using Minimum Samples in the Data Settings dialog as shown above).

2 4 Click on the top row in the table to show information for that sector.

The map now shows lines to the recommended additions (there are many additions in this example as the cellrefs file does not contain any 3G-2G neighbor definitions - therefore there are also no retentions or removals suggested). The thickness of each line shows how well the suggestion meets the criteria of the analysis. The circle represents the radius of the Maximum Intersite Distance (defined in the Data Settings dialog) used by the analysis to identify potential neighbors.

The map also displays the data points used in the analysis. The side panel on the left shows each recommendation for a sector individually, sorted by the % of data points that meet the recommendation algorithm.

Note that drive test data is binned according to the selections made in step 4 of defining the project template. However, any events displayed on the map (for example, by using the Events drop-down menu) will use the exact position rather than a binned position, so events might not align with the data points.

2 5 Examine each suggested additional neighbor.

If you accept all suggestions for a sector, you can click the related button in the table to mark your choice.

Note that the number beside the button changes to match your selection. For example, there were 12 suggested additions in the first row, with none currently selected for export, the number would show 0/12. If you clicked the button, the number would read 12/12. If you do not want to select every recommendation for a sector, you can use the table in the side panel on the left. So if you selected 5 additions, this would result in the number reading 5/12. This can be useful if there are a large number of recommendations and you need to keep track of how many you have already selected.

You may have reasons for refusing to accept the suggestion on

geographical grounds (for example, existing cells between the sector and the suggested addition), or for reasons related to the data settings. Also, you may know that one or more sites will be going off-air and should not be selected. Note that the more potential neighbors you add, the longer it will take a handset to find appropriate neighbors, conceivably resulting in a dropped call. You may well have an upper limit already defined by your internal guidelines, but you can also control this using the Data Settings link at the top of the screen and specify a new Max Neighbor List Size value.

6 Repeat this process for each row in the top table, as necessary.

2 8 Once you are satisfied with the recommendations that you have selected,

you can output them to a CSV file. From the top of the page, click the Export data link.

7.10.3 Features of this analysis page

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for every site, together with related site information. Clicking on a row in this table displays neighbor information for the selected cell in the side panel, and draw lines to neighbors on the map. The box beside each recommendation type shows which color it will be drawn in on the map - click on the check box to show or hide that particular recommendation type (by default, Removals are not shown).

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neighbors are drawn from that site. The circle represents the user-defined radius (Maximum Intersite Distance) used by the analysis to identify potential neighbors. The map also shows the data points used in the analysis.

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next to a recommendation can be selected for export to a CSV file.

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on the map. Currently plotted attributes are shown in red in the list. The currently selected attributes will be kept as you move between Spotlight's analysis pages.

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Currently plotted events are shown in red in the list.

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CSV file.

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algorithm that Spotlight uses for the missing neighbor analysis, which can be used to build lists of suggested neighbor cells to add and remove. All of the options take effect immediately after you click OK. See below for more information.

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SC and this feature colors red all the sites using this SC.

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7.10.4 Data settings for this page

Setting Default Description RxLev

Threshold (dB)

-95 The RxLev of the serving cell must be better than this value before the cell will be considered in the analysis. Reporting

Range (dB)

5 The RxLev of the serving cell must be no further than this from the RxLev Threshold before the cell will be

considered in the analysis (so no worse than -100 dB if using the default values).

Addition Threshold (%)

1 Defines the percentage of samples that must be reached to trigger a cell being added as a suggested neighbor. This is used to reduce the effect of stray signals.

Removal Threshold (%)

0.2 Defines the minimum percentage of samples that cells in the current neighbor list must achieve in order to be recommended for retention in the list. When the

percentages of samples fall below this threshold, cells will be recommended for removal from the list.

Minimal

Samples 50 Only sectors which have been measured above the Ec/Io Threshold at least this many times will be included in the analysis. Note that the algorithm works off Binned data Maximum

Intersite Distance (meters)

5000 Defines the maximum line-of-sight distance in meters between two cells for one to be considered for inclusion on the other's neighbor list. For rural areas where the

average intersite distance is naturally greater than a dense urban environment, use a higher value. To disable this feature, set this value to 0.

Only process first best ARFCN

Selected Select this option to analyze the neighbors of the best cell only. De-select this option if you want to analyze the neighbor list of all of the cells meeting the other criteria. Max

Neighbor List Size

32 Allows you to define the maximum number of

recommended neighbors. Note that the more potential neighbors you add, the longer it will take for a handset to find appropriate neighbors, conceivably resulting in a dropped call.

2 Setting Default Description

Angle to site threshold (degrees)

90 Defines the maximum angle between the edge of a cell's beam width and the data point, for that cell to be

considered for inclusion in the serving cell's neighbor list.

In this example, the beam width is shown as a darker blue arc, and the angle to site threshold in lighter blue arcs on either side. Acceptable data points are within this

threshold of the candidate sector's beam width, and are also within the Maximum Intersite Distance (the blue circle).

This threshold ensures that missing neighbors are not suggested from reflected signals or back-lobes, and also that only cells angled towards the data point are

suggested.

To disable this feature, set this value to 0.

Once a potential neighbor list has been calculated for each data point, they are aggregated by serving cell to produce the recommended neighbor list. This is compared with the existing list to calculate which are additions, retentions and removals.

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