Teria is a Quality of Service Measurements System for TETRA Networks.
What does it do?
To provide a reliable mechanism to gauge the actual coverage and experiences of a subscriber, Quality of Service measurements are required. Collation and analysis of the data gathered from TERIA QoS survey tool enables Key performance indicators for:
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| - Call set-up delay time (CSD) |
| - Call set-up success rate (CSSR) |
| - Call success rates (CSR) |
| - Voice quality (PESQ Analysis to ITU-T Rec. P.862) |
| - Call fail locations |
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TERIA can be scaled to meet the user requirements for comparing and testing a number of terminals and or networks simultaneously. The TERIA system can be quickly ‘built up’ to provide ‘Load’ testing facilities, by adding TERIA’s together. TERIA can be installed in a vehicle or used in a backpack for walk testing.
TERIA is designed to be used for both network acceptance testing and ongoing network monitoring and maintenance. TERIA provides layer 3 engineering output for detailed analysis of call events.
How does it work?
TERIA comprises two test units, each test unit controls a Tetra terminal. In a typical installation one TERIA is placed in a static location in good radio coverage and the mobile unit is placed in a survey car or back pack.
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| Preparation
Prior to the start of testing the operator creates a test script using the TERIA windows software application. With this the operator selects the call duration, the number of PTT steps during a call, and the call offset when there are more than 2 units in use. |
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| Execution
Test calls are made automatically following the test script selected by the operator. LED’s on the front of the TERIA units indicate call progress and TERIA status. The operator can connect a laptop to the TERIA to see call progress information if required. Call data is logged on both the Static and Mobile units, giving uplink and downlink information. GPS co-ordinates for accurate positioning of call progress and voice quality measurements is provided with the call data. |
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| Reporting
Results data is processed using the TERIA windows application. Data can be processed to produce results by test drive route or by day. The operator can select multiple days and test routes to create output files for display in a GIS e.g. MapInfo. Detailed results analysis of speech quality metrics and cal success rates are provided in any easy to understand format. All data can be exported as .CSV files for import to customer own databases. Engineering data is viewed using the Motorola ‘Scout package’. |
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