Mobile terminal test device and method

A mobile terminal test device, comprising:

• a transmission and reception unit that simultaneously outputs a plurality of downlink signals in different frequency bands for being applied to a mobile terminal of a test target corresponding to a carrier aggregation scheme, and receives an uplink signal output from the mobile terminal;
• a signal generator that is capable of switching and outputting an interference signal of a continuous wave (CW) required for measurement of out-of-band blocking performance in a predetermined frequency step over a predetermined frequency range;
• a frequency variable filter that receives the interference signal output from the signal generator, suppressing a frequency component overlapping the designated frequency band among the frequency bands of the downlink signal likely to be output from the transmission and reception unit, from frequency components other than a fundamental wave component of the interference signal, and outputting a resultant interference signal;
• and
• a signal combination unit for combining the interference signal output from the filter with the plurality of downlink signals output from the transmission and reception unit and applying a combination signal to the mobile terminal, the mobile terminal test device measuring the throughputs for respective interference signal frequencies for the plurality of downlink signals of the mobile terminal receiving the combination signal, the mobile terminal test device further comprising:
• collective throughput measurement means for measuring the throughputs for respective interference signal frequencies for the plurality of downlink signals of the mobile terminal receiving the combination signal, collectively with respect to the plurality of downlink signals;
• throughput determination means for determining whether or not the throughput for each interference signal frequency measured by the collective throughput measurement means is equal to or greater than the defined value;
• throughput re-measurement means for performing designation so that a signal suppression band of the filter overlaps the frequency band of a downlink signal determined not to reach the defined value by the throughput determination means when there is the downlink signal, and performing re-measurement of the throughput for the downlink signal;
• throughput re-determination means for determining whether or not the throughput re-measured by the throughput re-measurement means is equal to or greater than the defined value;
• and
• interference signal frequency switching means for determining that out-of-band blocking performance of all the downlink signals at the interference signal frequency satisfies a criterion in a case where the throughput determination unit determines that the throughputs measured by the collective throughput measurement means at a certain interference signal frequency are equal to or greater than the defined value or a case where the throughput re-determination means determines that throughputs of all the downlink signals re-measured by the throughput re-measurement means are equal to or greater than the defined value, and switching the frequency of the interference signal output from the signal generator to the next interference signal frequency to cause the collective throughput measurement means to perform the throughput measurement.