the Training_Class_Queries.aqf file.
7. Click OK to close the Analysis Manager.
This query should be used to analyze Scanner data only.
Look at the results of the query for a UMTS scanner on the map.
Points with Pilot Pollution, as defined by the expression, will show up on the map as a Boolean 1. Points with no Pilot Pollution will show up as a 0.
You may be interested in looking at the number of SCs above the threshold at each location, as opposed to a Boolean value that designates data points where more than four SCs are above that threshold.
How could you modify the Pilot Pollution Identification query you just created to give the number of SCs above –15 dB at each data point?
Figure 57 - Map Displaying the Results of the Pilot Pollution Query
Introdu c tio n to A-RVS fo r UMTS
The results of the Scanner Pilot Pollution query indicate where the Pilot Pollution condition exists. To determine which SCs contribute to the condition, it may be useful to display the EcIo values for each SC on a table, or to create a custom StateForm for viewing the levels of the Top N SCs.
Additional Binned Queries
Binned queries may include any expression or combination of parameters from the Analyzer workspace. Some additional binned query ideas that may be useful for UMTS analysis are included in the UMTS Training Queries.aqf file that is installed with the training materials, and are described here:
The Number of SCs Within 3 dB of the Strongest Server query provides the number of SCs at each data point, including the strongest SC, measured within 3 dB of the strongest server. The expression uses the
UMTS scanner parameter CPICH_Scan_EcIo_SortedBy_EcIo, which provides
the scanned EcIo values in order from strongest to weakest. The array_max function is used to ensure that the strongest EcIo value is selected for comparison purposes. The Format for this expression is Count.
Figure 58 – Expression Builder for Number of SCs Within 3 dB Query
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The High Active Set Count query indicates data points where there are three or more SCs in the Active Set.
The threshold in this expression can be modified as required. The Format for this expression is Boolean, so that the query will return a ‘True’ or ‘False’ result depending upon whether the high active set count condition is met.
Figure 59 - Expression Builder for High Active Set Count Query
Some parameters, such as Uu_CallState, are collected infrequently, and may appear sporadically when displayed on any Analyzer view. In such cases, the state function may be used to hold the last valid value of the parameter and provide a solid data trail. The Uu_CallState Last Valid Value query demonstrates the use of the state function to hold the last valid value for Uu_CallState, providing a solid data trail for that parameter.
Introdu c tio n to A-RVS fo r UMTS
Figure 60 - Expression Builder for Uu_CallState Last Valid Value
It may be desirable to find the strongest SC, or the EcIo of the strongest SC, for a user defined list. The
“subarray” function types allow the user to find the nth strongest/weakest element in a list specified by the user.
The Scanner Strongest SC - User Defined List and Scanner Strongest EcIo - User Defined List queries return the strongest SC/EcIo for SCs 11, 12, 13 and 14.
The list may be modified for the SCs of interest.
Figure 61 - Expression Builder for Scanner Strongest SC - User Defined
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Figure 62 - Expression Builder for Scanner Strongest EcIo - User Defined
It is possible to filter on the results of a binned query expression. This technique is used in the Display SysInfo Messages filter. It shows only data points at which these messages were received. The Filter Wizard for this analysis is shown below:
Figure 63 - Filter Wizard for Display SysInfo Messages Filter
The Message Type Filter expression was created to specify the messages to include in the filter:
Introdu c tio n to A-RVS fo r UMTS
Figure 64 - Message Type Filter Expression
The expression uses the Boolean AND (‘&&’) operator to specify Uu_RRC_MsgType numbers that indicate SysInfo messages (1100 – 3600). The expression returns a “true” value if the current
Uu_RRC_MsgType falls within this range. The filter is set up to include only those data points where this expression evaluates to
“true”. When entering a threshold for a parameter with discrete values, it is necessary to type the enumerated value of the choice you wish to select. In this case, it is necessary to type a ‘1’ in the text box – selecting ‘1 = true’ from the drop down list will corrupt the filter.
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Histogram and Statistic Query Analysis
Serving cell distance is an important parameter to consider when diagnosing network problems. Knowing the average serving cell distance throughout a logfile or the number of data points at which the distance is high may indicate whether the data network is performing properly.
Analyzer’s Histogram and Statistic Queries are available to provide these
analysis formats for custom expressions. Since the serving cell distance in miles is not available as a standard Analyzer parameter, it is necessary to use the Histogram and Statistic Query formats to provide results for this type of analysis.
ServingCellDistance in Miles Statistic Query
This section describes the creation of a Statistic Query for the ServingCellDistance in Miles custom expression.