GeminiTM

Drive-test tool for

digital radio networks

Gemini is trade mark of Radio Systems Information Ltd

Key Features• Measurement of speech quality to ITU-T Rec. P.862

• Compatible with TETRA radio terminals– Motorola MTM700– Sepura SRP2000– Cleartone

• Survey using up to 4 radios simultaneously

• Expandable design for large networks

• Very powerful built-in analysis functions

How does GeminiTM work?

• continuously makes calls between mobile and fixed parts of Gemini

• call failures logged

• call setup time logged

• speech samples sent on uplink & downlink to test speech quality

Analysing Results

• Results displayed as icons on maps

– original quality

– very poor TETRA quality

– poor TETRA quality

– standard TETRA quality

• Following examples show different types of analysis on maps

• Speech quality measured as Mean Opinion Score

Colour indicates audio quality

Colour indicates Base Station

Colour indicates Signal Strength

Poor Coverage Area

Lots of handovers, No Service and Call Drops

Good Coverage Area

All calls completed OK

Analysing Results

• Results displayed on Graphs - almost any parameter can be displayed against any other parameter

• Following examples show different types of analysis on graphs

GeminiTM Antenna

Combiner

• Connect up to 4 TETRA radios to a single antenna in a survey vehicle

• Meets all ETSI interference requirements

GeminiTM Applications

• Network acceptance

• Investigating problems

• Benchmarking network performance

• Annual performance checks

• Objective measurements for contractual negotiations