The software allows the radio communication analyzers to set up multi-slot calls, in both the uplink and downlink directions, and perform numerous RF measurements. An optional variable downlink slot power feature gives the user complete control over the level and content of each downlink slot, for realistic simulation of multi-slot environments.
When testing transmitters on multiple time slots, the MT8801C and MT8802A measure the output power to ensure that it is within the correct power/time mask, even when adjacent slots are active and at different levels. The power/time templates can be customized, allowing for measurements to be analyzed against user-defined criteria.
Additional transmitter tests that can be performed include RACH burst capture to measure the accuracy and timing of RACH bursts, and adjacent channel power to monitor spurious emissions. A GPRS test mode command places the mobile under test into a known transmission state for repeatable transmitter (Tx) measurements. An optimized transmitter test function can be initiated so only those measurements required are performed, saving production time.
Time savings can also be realized on receiver measurements. The radio communication analyzers perform an early prediction of the BER/BLER based on a limited number of samples. If it is below a user-defined threshold, the test terminates with a pass. If not, the test continues for the designated number of samples. Such capability can result in 80% time savings. When measuring BER, the radio communication analyzers offer type A, B, and C loopback for GSM, and Type G for HSCSD, which provides a higher slot sampling size yielding faster test times.
Measurement quality, speed, and accuracy are achieved because the radio communication analyzers simulate GPRS network protocols, thereby eliminating the need for special test modes. The simulation offers the ability to easily select power levels, allocate slots, alter timing advance, perform handovers (including dual-band), and vary a number of network system information parameters. The MT8801C and MT8802A support a comprehensive list of GPIB commands, so the user can develop a complete suite of tests for remote control operation. A LabWindows driver is available to help users optimize remote control test programs.