JP5426638B2 - Mobile communication terminal test system and test method - Google Patents

Description

  The present invention relates to a test system and a test method for testing a mobile communication terminal by inputting an RF test signal to a test target mobile communication terminal while changing the level.

2. Description of the Related Art A test system for testing whether or not communication can be normally performed for a mobile communication terminal that performs communication using a communication method such as W-CDMA (Wideband Code Division Multiple Access) or LTE (Long Term Evolution) is known. . (For example, Patent Document 1)
FIG. 5 shows an example of a conventional test system. The test system 100 is connected to the antenna terminal of the mobile communication terminal 2 via a coaxial cable 90, and inputs an RF test signal to the mobile communication terminal 2 via the coaxial cable 90, and from the mobile communication terminal 2. The mobile communication terminal 2 is tested by analyzing the RF signal and analyzing communication data obtained by demodulating and decoding the RF signal. The test system 100 includes an overall control device 110, a pseudo base station device 120, a signal analysis device 40, a signal generation device 50, a combiner 60, and a distributor 70.

  The overall control device 110 is connected to the pseudo base station device 120, the signal analysis device 40, and the signal generation device 50 through GP-IB or Ethernet (registered trademark), and remotely controls these devices to each device. Make necessary settings for the test and instruct the start and end of the operation. Also, analysis results of signals and communication data are collected from each device and displayed.

The pseudo base station apparatus 120 simulates the operation of an actual base station and communicates with the mobile communication terminal 2 by a predetermined communication method. Hereinafter, each part which comprises the pseudo base station apparatus 120 is demonstrated. The transmission unit 22 outputs an RF signal for transmission to the mobile communication terminal 2. The receiving unit 28 receives the RF signal from the mobile communication terminal 2, converts the frequency into a baseband signal, and demodulates it. The directional coupler 27 receives the RF signal from the transmission unit 22 and outputs the RF signal to the RF signal path 80 in the test system 100 and receives the RF signal output from the mobile communication terminal 2 from the RF signal path 80. Output to the receiver 28. The communication data processing unit 29 receives and processes the reception data demodulated by the reception unit 28, and outputs transmission data to be transmitted to the mobile communication terminal 2 to the transmission unit 22. The pseudo base station control unit 121 controls each unit in the pseudo base station device 120 based on an instruction from the overall control device 110, receives a communication result with the mobile communication terminal 2 from the communication data processing unit 29, and It is sent to the overall control device 110.

  Furthermore, the structure of the transmission part 22 is demonstrated. The BB signal generation unit 23 generates a digital IQ baseband signal based on the transmission data output from the communication data processing unit 29. The level control unit 24 controls the level of this baseband signal. The level control unit 24 can control the level of the digital IQ baseband signal in a range of −10 dBm to −40 dBm in steps of 0.1 dB. The level control unit 24 realizes this level control by multiplying the digital IQ baseband signal data by a constant corresponding to a desired level. The frequency conversion unit 25 performs D / A conversion on the level-controlled digital IQ baseband signal to perform quadrature modulation, and also converts the frequency into an RF signal. The ATT 26 is a step attenuator that varies the attenuation in 5 dB steps in the range of 0 dB to 100 dB, and attenuates and outputs the RF signal by the set attenuation. The ATT 26 can obtain a desired attenuation amount by individually switching and combining a plurality of fixed resistors having different attenuation amounts, such as 5 dB, 10 dB, 20 B, and 40 dB.

  Here, the level control unit 24 can perform level control at high speed in fine steps, but has a characteristic in which the level variable range is narrow. In contrast, the ATT 26 has a rough attenuation step and takes a long time to switch the attenuation, but has a wide variable range of attenuation. The transmitter 22 controls the level of the RF signal by controlling the level controller 24 and the ATT 26 in combination. The pseudo base station control unit 121 receives an RF signal transmission level and frequency instruction from the overall control device 110, sets the level for the level control unit 24, sets the frequency for the frequency conversion unit 25, and attenuates the ATT 26. Is set.

  The signal analyzer 40 receives the RF signal from the mobile communication terminal 2 via the distributor 70 and analyzes the level and frequency characteristics of the RF signal. As a test performed using the signal analysis device 40, for example, there is an adjacent channel leakage power ratio (ACLR) measurement.

  The signal generator 50 is used, for example, when an RF signal including an interference wave is input to the mobile communication terminal 2 and a test is performed to determine whether the mobile communication terminal 2 can normally receive the signal. In this case, the signal generator 50 outputs a signal of an interference wave having a predetermined level and a predetermined frequency.

  The combiner 60 combines the RF signal from the pseudo base station apparatus 120 and the signal from the signal generator 50 and outputs the combined signal to the mobile communication terminal 2 and outputs the RF signal from the mobile communication terminal 2. Output toward the pseudo base station apparatus 120. The distributor 70 outputs the RF signal from the pseudo base station apparatus 120 to the mobile communication terminal 2 and outputs the RF signal from the mobile communication terminal 2 to the pseudo base station apparatus 120, the signal analysis apparatus 40, and the like. To distribute to and output.

  The RF signal path 80 from the pseudo base station apparatus 120 to the coaxial cable 90 is provided with a filter and a path switch not shown. In order to perform a highly accurate test, the filter is used to remove unnecessary frequency components not related to the test from the RF signal, and a plurality of types of filters can be selected. In addition, the path switch performs selection of this filter and switches whether or not the RF signal from the pseudo base station apparatus 120 or the mobile communication terminal 2 passes through the coupler 60 and the distributor 70. The path changeover switch is controlled by the overall control device 110 so as to configure an RF signal path 80 that conforms to test items and test conditions.

JP 2011-61749 A

  As one of the test items, the level of the RF test signal input from the pseudo base station apparatus 120 to the mobile communication terminal 2 is changed by a predetermined step (for example, 1 dB), and the mobile communication terminal 2 receives normally. Some test whether it can continue. FIG. 6A is a graph showing the time change of the test signal level in the reception characteristic test of the mobile communication terminal 2. The test signal output from the pseudo base station apparatus 120 is configured to decrease the level by a predetermined step from the maximum value A to the minimum value B as indicated by a solid line in the graph. Or, conversely, as indicated by a dotted line in the graph, the level is increased from the minimum value B to the maximum value A by a predetermined step.

  However, when switching of the attenuation amount of the ATT 26 of the pseudo base station apparatus 120 occurs while changing the level in this way, as shown in FIG. 6B, the test time is equal to the switching time of the ATT 26. Will take extra. This is because, as described above, the level control by the level control unit 24 is fast, but switching of the attenuation amount of the ATT 26 takes time.

  In order to perform the test of the mobile communication terminal in a short time with respect to the above-described problems, the present invention provides an RF test signal whose level changes without switching the attenuation of the time-consuming step attenuator. It is an object of the present invention to provide a test system and a test method for performing a test input to a mobile communication terminal to be tested.

In order to achieve the above object, a test system according to the present invention includes a BB signal generation unit (23) that generates a digital baseband signal, and a level control unit that controls the level of the baseband signal within a predetermined level range. (24), a frequency converter (25) that D / A converts the level-controlled baseband signal and converts the frequency into an RF signal, and a plurality of attenuation amounts can be set, and the RF signal is set. A step attenuator (26) that attenuates the amount of attenuation and outputs it as a test signal, and sends the test signal whose level is controlled by the level control unit and the step attenuator to the mobile communication terminal (2) to be tested. to perform the pseudo base station apparatus (20), the level of the test signal is changed and sends the mobile communication terminal testing for, the pseudo base A test system having a total control unit (10) for controlling the device, the overall control device, said level controller is controllable level range, the attenuation of the step attenuator, the level range and the A level correspondence information storage unit (13) for preliminarily storing level correspondence information in which the level variable range of the test signal derived based on the attenuation amount is associated with each attenuation amount of the step attenuator; A level setting unit (14) for selecting an attenuation amount corresponding to the level variable range including the maximum value and the minimum value of the level of the test signal in the test with reference to the level correspondence information, and the selected attenuation After setting only the amount as the attenuation amount of the step attenuator, the level control unit is controlled to change the level of the test signal, And performing the serial test.
In the test system of the present invention, the level correspondence information storage unit stores a path loss that is a loss of a path from the pseudo base station apparatus to the mobile communication terminal, and the level variable range includes the level control It may be derived based on a level range that can be controlled by the unit, the attenuation of the step attenuator, and the path loss.
In the test system of the present invention, in order for the overall control apparatus to perform the test, the pseudo base station apparatus includes control information including information related to the level of the test signal, and the pseudo base station apparatus transmits the mobile communication. A scenario storage unit (11) for storing a scenario in which communication messages to be communicated with a terminal are stored as a time-series sequence, and a scenario processing unit for controlling the pseudo base station apparatus according to the scenario read from the scenario storage unit (12), and the level setting unit extracts information on the level of the test signal from the scenario read by the scenario processing unit, detects the maximum value and the minimum value of the test signal level, and detects the detected test The one attenuation amount is selected based on the maximum value and the minimum value of the signal level, and the extracted test at the selected attenuation amount is selected. A constant for controlling the level control unit is determined in response to information on the level of the signal, and information on a combination of the constant and the selected attenuation amount is sent to the scenario processing unit. The scenario processing unit The pseudo base station apparatus may be controlled by replacing the information on the level of the test signal of the read scenario with the information on the combination received from the level setting unit.
The test method of the present invention includes a BB signal generation unit (23) that generates a digital baseband signal, a level control unit (24) that controls the level of the baseband signal within a predetermined level range, and this level. A frequency conversion unit (25) that D / A converts the controlled baseband signal and converts the frequency into an RF signal, and a plurality of attenuation amounts can be set, and the RF signal is attenuated by the set attenuation amount and tested. And a step attenuator (26) for outputting as a signal, and a pseudo base station device (20) for sending the test signal whose level is controlled by the level control unit and the step attenuator to the mobile communication terminal (2) to be tested. ) and, delivered to the using and the overall control device (10) for controlling the pseudo base transceiver station, the mobile communication terminal by changing the level of the test signal A level range controllable by the level control unit, an attenuation amount of the step attenuator, a level range of the test signal derived based on the level range and the attenuation amount And a level correspondence information storage step for storing level correspondence information associated with each attenuation amount of the step attenuator, and referring to the level correspondence information, the maximum value of the level of the test signal in the test, and An attenuation amount selection step for selecting an attenuation amount corresponding to the level variable range including the minimum value, and for controlling the level control unit when only the selected attenuation amount is set as the attenuation amount of the step attenuator. A constant determining step for determining a constant of the signal, and the test whose level is controlled by the determined constant and the selected attenuation amount. By sending a signal to the mobile communication terminal characterized by comprising a test executing to perform the test.
In the test method of the present invention, the level correspondence information storage step stores a path loss that is a loss of a path from the pseudo base station apparatus to the mobile communication terminal, and the level variable range includes the level control May be derived based on a level range controllable by the unit, the attenuation of the step attenuator, and the path loss.
Further, the test method of the present invention provides the control information of the pseudo base station apparatus including information on the level of the test signal and the communication message that the pseudo base station apparatus communicates with the mobile communication terminal in order to perform the test. Storing a scenario stored as a time-series sequence, a scenario reading step for reading the stored scenario, and a level of the test signal from the read scenario for performing the attenuation selection step A detection step of extracting information on the test signal level to detect a maximum value and a minimum value of the test signal; information on the level of the test signal in the read scenario; information on the determined constant and the selected attenuation amount And a test execution stage according to a scenario in which information is replaced in the replacement stage. It may be adapted to carry out the serial test.

  In the test system and test method of the present invention, only the attenuation corresponding to the level variable range including the maximum value and minimum value of the test signal level in the test is set as the attenuation amount of the step attenuator, and the level control unit is controlled. The test is performed by changing the level of the test signal. For this reason, when performing a test in which an RF test signal whose level changes is input to the mobile communication terminal, the time-consuming step attenuator attenuation is not switched, and the mobile communication terminal test can be performed in a short time. Can be done.

Block diagram of an embodiment of the present invention Example scenario for a given test item Example of level correspondence information for a given test item Flowchart of an embodiment of the present invention Block diagram of a conventional test system Graph showing test signal level over time

  FIG. 1 shows a configuration of a test system 1 of the present invention. The test system 1 includes an overall control device 10, a pseudo base station device 20, a signal analysis device 40, a signal generation device 50, a combiner 60, and a distributor 70. In addition, the same number is attached | subjected to the thing of the same structure as the conventional test system 100 shown in FIG. 5, and description is abbreviate | omitted suitably.

  The overall control device 10 is connected to each device in the test system 1 by GP-IB or Ethernet (registered trademark), and remotely controls these devices and performs settings necessary for the test on each device. Instruct the start and end of the operation. Also, analysis results of signals and communication data are collected from each device and displayed. The overall control apparatus 10 includes a scenario storage unit 11, a scenario processing unit 12, a level correspondence information storage unit 13, and a level setting unit 14.

  The scenario storage unit 11 stores different scenarios for each test item. The test item is defined as a test standard for a communication method adopted by the mobile communication terminal, or is uniquely determined by the manufacturer of the mobile communication terminal. A scenario describes a sequence of necessary settings and operations when the test system 1 performs a corresponding test item. FIG. 2 shows an example of a scenario for a predetermined test item. In FIG. 2, information of “test item name”, “setting of each device”, and “control and communication sequence of each device” is described in the scenario.

  “Test item name” is information for identifying a test item. “Setting of each device” is setting information for each device and each part in the test system 1 corresponding to this test item, and the overall control device 10 sets a remote control destination device according to this setting information. For example, the overall control apparatus 10 instructs the pseudo base station apparatus 20 in accordance with the setting information, the communication method (W-CDMA or LTE) and the center frequency of the RF signal (used for the frequency conversion unit 25), and the signal analysis apparatus The measurement item and the measurement frequency range are instructed to 40, the type, level, and frequency of the signal to be generated are instructed to the signal generator 50, and a changeover switch (not shown) of the RF signal path 80 is switched.

  “Sequence of control and communication of each device” includes information on control of each device when executing the test of this test item, and a transmission message of the pseudo base station device 20 for communicating with the mobile communication terminal 2. Are described in time series. In accordance with this, the overall control apparatus 10 causes the pseudo base station apparatus 20 to communicate with the mobile communication terminal 2, causes the signal analysis apparatus 40 to perform measurement, causes the signal generation apparatus 50 to output a signal, and outputs analysis results from each apparatus. collect.

  The scenario processing unit 12 reads the scenario corresponding to the test item specified by the tester from the scenario storage unit 11. Then, the settings and sequences described in the read scenario are sequentially executed. Further, the scenario processing unit 12 receives information on the combination of the constant of the level control unit 24 and the attenuation amount of the ATT 26 from the level setting unit 14 and replaces it with the control information of the original test signal level of the scenario. Information on the combination of the replaced constant of the level control unit 24 and the attenuation amount of the ATT 26 is transmitted from the overall control device 10 to the pseudo base station device 20 at a timing according to the sequence described in the scenario.

  The level correspondence information storage unit 13 stores level correspondence information for each test item in a table format. FIG. 3 shows an example of level correspondence information for a predetermined test item. The level correspondence information includes the maximum value and the minimum value of the level control range of the level control unit 24 in the pseudo base station apparatus 20, the attenuation amount of each step of the ATT 26 in the pseudo base station apparatus 20, the RF signal path 80, and the coaxial cable. Corresponding to each item of the path loss indicating the loss of the RF signal caused by 90, the maximum and minimum values of the test signal level variable range derived from these values, and the setting number N for identifying each correspondence information by serial number It is the attached information.

  The level control range of the level control unit 24 is determined in advance as the performance of the pseudo base station apparatus 20, and has a control range of 30 dB from −10 dBm to −40 dBm. The attenuation amount of the ATT 26 is determined in advance as the performance of the pseudo base station apparatus 20, and has a setting range in 5 dB steps from 0 dB to 100 dB, and the attenuation amount for each step is stored in the level correspondence information. .

  The route loss has a different value for each test item. This will be described. Each of the coupler 60, the distributor 70, and the filter (not shown) has a loss, and whether or not these are included in the RF signal path 80 by the switch (not shown). change. This switching is performed according to an instruction from the overall control device so as to obtain a configuration suitable for a predetermined test item. Therefore, the configuration and loss of the RF signal path 80 are different for each test item. Therefore, the path loss value is different for each test item. Therefore, the level correspondence information storage unit 13 stores level correspondence information for each test item. The path loss includes the loss of the coaxial cable 90. The path loss stores a design value calculated at the design stage of the test system, or an actual value actually measured at the time of manufacturing inspection of the test system.

  The test signal level variable range indicates the maximum value and the minimum value of the test signal level that can be supplied at the input terminal of the mobile communication terminal 2 to be tested for each attenuation amount of the ATT 26. For example, in the setting number N = 2 in FIG. 2, the maximum value of the output level of the level control unit 24 is −10 dBm, which is attenuated by 5 dB by the ATT 26 and further attenuated by 10 dB by the path loss. The test signal level at the end is -25 dBm. That is, it is calculated by the equation: “Test signal level at input terminal of mobile communication terminal 2” = “output level of level control unit 24” − “attenuation amount of ATT 26” − “path loss”. Accordingly, for each setting number N, the maximum value and the minimum value of the test signal level that can be supplied at the input terminal of the mobile communication terminal 2 are determined and stored. .

  The level setting unit 14 extracts information on the test signal level from the scenario read out from the scenario storage unit 11 by the scenario processing unit 12, detects the maximum value and the minimum value of the extracted test signal level, and stores the level correspondence information Referring to unit 13, the attenuation amount of ATT 26 corresponding to the maximum value of the test signal level is determined. Further, the level setting unit 14 determines the constant of the level control unit 24 corresponding to the test signal level and the attenuation amount of the ATT 26 for each test signal level extracted from the scenario, and sends it to the scenario processing unit 12.

  The operation of the level setting unit 14 will be specifically described with reference to FIGS. The scenario of FIG. 2 read by the scenario processing unit 12 from the scenario storage unit 11 includes three sequences indicating test signal level settings: “test signal level = −27 dBm”, “test signal level = −32 dBm”, “test “Signal level = −47 dBm” is described (the sequence in FIG. 2 is omitted, so there are actually more sequences). The level setting unit 14 extracts these pieces of information, and detects the maximum value = −27 dBm and the minimum value = −47 dBm of the test signal.

  The level setting unit 14 refers to the level correspondence information storage unit 13 and confirms the test signal level variable range of the level correspondence information in FIG. 3 corresponding to this test item. Settings including the maximum value of the test signal level in this scenario = −27 dBm in the level variable range are setting numbers N = 1 and 2. In the case of N = 3, since the maximum value of the test signal level variable range of the level correspondence information is −30 dBm, it is smaller than the maximum value of the test signal level of the scenario, so it is not suitable. Here, considering the S / N ratio of the test signal, it is preferable to output the signal from the level control unit 24 at a large level and attenuate it by the ATT 26. Accordingly, among the setting numbers N = 1 and 2, the setting number N = 2 is selected. In the level correspondence information shown in FIG. 3, since the ATT attenuation at N = 2 = 5 dB, the first attenuation of ATT 26 is determined to be 5 dB.

  Further, the level setting unit 14 confirms the minimum value of the test signal level variable range of the level correspondence information at N = 2. In this case, the minimum value of the test signal level of the scenario = −47 dBm is larger than the minimum value of the test signal level variable range of the level correspondence information at N = 2 = −55 dBm. Accordingly, by determining that the first attenuation amount of the ATT 26 is 5 dB, the level control of the test signal in this scenario can be performed only by the control of the level control unit 24 without switching the attenuation amount of the ATT 26.

  When the minimum value of the test signal level of the scenario is smaller than the minimum value of the test signal level variable range of the level correspondence information in the setting number N, the attenuation amount of the ATT 26 needs to be switched. For this reason, a different setting number N is determined so as to cover the level from the maximum value to the minimum value of the test signal detected from the scenario in combination with the test signal level variable range in the first attenuation amount. The ATT attenuation amount at the number N is read from the level correspondence information, and this ATT attenuation amount is determined as the second attenuation amount to be set in the ATT 26. That is, among the levels from the maximum value to the minimum value of the test signal detected from the scenario, in the range where the level is large, the level is changed by the level control unit 24 by setting the ATT 26 to the first attenuation amount, and the level is small. For the range, the level is varied by the level control unit 24 with the ATT 26 set to the second attenuation amount. If the level of the test signal detected from the scenario cannot be covered using two ATT attenuations, the test signal level is covered using three or more ATT attenuations.

  Further, the level setting unit 14 determines a constant of the level control unit 24 corresponding to each test signal level extracted from the scenario. In other words, the level control unit 24 controls and outputs it by an arithmetic expression of [output level of the level control unit 24] = [test signal level described in the scenario] + [path loss] + [determined ATT attenuation amount]. Find the power level and determine the corresponding constant. Then, information on the combination of the constant of the level control unit 24 and the attenuation amount of the ATT 26 is sent to the scenario processing unit 12.

The pseudo base station control unit 21 of the pseudo base station apparatus 20 controls each unit in the pseudo base station apparatus 20 based on an instruction from the overall control apparatus 10 and performs communication data processing on a communication result with the mobile communication terminal 2. Received from the unit 29 and sent to the overall control device 10. Here, when the pseudo base station control unit 21 receives information on the combination of the constant of the level control unit 24 and the attenuation amount of the ATT 26 from the overall control device 10, the pseudo base station control unit 21 sets the level control unit 24 and the ATT 26 accordingly.

  Next, operation | movement of the test system 1 of this invention is demonstrated with the flowchart of FIG. When the tester specifies a desired test item in the overall control apparatus 10, the scenario processing unit 12 reads a scenario corresponding to the specified test item from the scenario storage unit 11 (S1). The level setting unit 14 extracts information on the test signal level from the scenario read by the scenario processing unit 12, and detects the maximum value and the minimum value of the extracted test signal level (S2).

  The level setting unit 14 refers to the level correspondence information storage unit 13 and checks the maximum value of the test signal level variable range at the setting number N = 1 in the level correspondence information corresponding to the desired test item (S3). Then, the level setting unit 14 compares the maximum value of the test signal level detected from the scenario with the maximum value of the test signal level variable range of the level correspondence information (S4). As a result of comparison, if the maximum value of the test signal level detected from the scenario is smaller than the maximum value of the test signal level variable range of the level correspondence information, the value of the setting number N is increased by 1 (S5), and the increase Comparison is performed again using the maximum value of the test signal level variable range of the level correspondence information in the set number N.

  As a result of the comparison, if the maximum value of the test signal level detected from the scenario is larger than the maximum value of the test signal level variable range of the level correspondence information, the ATT at the setting number Na that is smaller by 1 than the setting number N at this time The attenuation amount is read from the level correspondence information, and this ATT attenuation amount is determined as the first attenuation amount to be set in the ATT 26 (S6). That is, the maximum value of the test signal level detected from the scenario is compared with the maximum value of the test signal level variable range of the level correspondence information sequentially from the setting number N = 1, and the maximum value of the test signal level detected from the scenario However, when the maximum value of the test signal level variable range of the level correspondence information is exceeded, the ATT attenuation amount at the immediately preceding setting number N is used.

  Further, the level setting unit 14 compares the minimum value of the test signal level detected from the scenario with the minimum value of the test signal level variable range of the level correspondence information (S7). As a result of this comparison, when the minimum value of the test signal level detected from the scenario is larger than the minimum value of the test signal level variable range of the level correspondence information, switching of the ATT 26 is not necessary.

  Further, as a result of the comparison, when the minimum value of the test signal level detected from the scenario is smaller than the minimum value of the test signal level variable range of the level correspondence information, the ATT 26 must be switched. In this case, the level setting unit 14 determines a setting number Nb that covers the level from the maximum value to the minimum value of the test signal detected from the scenario in combination with the test signal level variable range in the setting number Na. The ATT attenuation at the setting number Nb is read from the level correspondence information, and this ATT attenuation is determined as the second attenuation to be set in the ATT 26 (S8).

  After determining the attenuation amount set in the ATT 26 in this way, the level setting unit 14 determines a constant to be set in the level control unit 24 (S9). The level setting unit 14 sends information on the combination of the determined constant of the level control unit 24 and the attenuation amount of the ATT 26 to the scenario processing unit 12. The scenario processing unit 12 replaces the information related to the test signal level of the read scenario with this combination information (S10).

Then, the scenario processing unit 12 executes a scenario sequence (S11). Here, for example, the information related to the test signal level of “test signal level = −27 dBm” in the sequence of FIG. 2 is replaced with the information of the combination of the constant of the level control unit 24 and the attenuation amount of the ATT 26. 10 to the pseudo base station apparatus 20 is sent information on the combination of the constant of the level control unit 24 and the attenuation amount of the ATT 26. Upon receiving this information, the pseudo base station control unit 21 of the pseudo base station apparatus 20 sets the attenuation amount in the ATT 26, sets this constant in the level control unit 24, and outputs a test signal. The test signal output from the pseudo base station apparatus 20 passes through the RF signal path 80 and the coaxial cable 90 and is input to the mobile communication terminal 2. At this time, the test signal is attenuated by the path loss of the level correspondence information by the RF signal path 80 and the coaxial cable 90. The “test signal level = −32 dBm” and “test signal level = −47 dBm” in the sequence of FIG. 2 are also replaced with information of combinations of corresponding attenuation amounts and constants. It is sent to the station device 20 and set. Note that when the attenuation amount is set in the ATT 26, the attenuation amount of the ATT 26 is not switched if the setting is the same as the previous attenuation amount.

As described above, if the level of the test signal is described in the scenario as the level to be input to the mobile communication terminal 2 to be tested, the overall control device 10 can respond to that level and the switching of the ATT 26 is generated as much as possible. Determine the level setting that will not be performed. For this reason, the test of the mobile communication terminal 2 can be performed in a short time. At the same time, it is not necessary for the scenario creator to determine the signal output level of the pseudo base station apparatus 20 in consideration of the path loss and describe it in the scenario, and the scenario creation becomes easy.

  The test system and test method of the present invention eliminates unnecessary step attenuator switching and can perform tests in a short time, and thus are useful for testing mobile communication terminals.

DESCRIPTION OF SYMBOLS 1 ... Test system, 10 ... Overall control apparatus, 11 ... Level correspondence information storage part, 12 ... Level setting part, 13 ... Scenario storage part, 14 ... Scenario processing part, 20 ... Pseudo base station apparatus , 21 ... Pseudo base station control parts, 22 ... transmission unit, 23 ... BB signal generating unit, 24 ... level controller, 25 ... frequency conversion unit, 26 ... ATT (step attenuator), 27 ... directional coupler, 28 ... receiving unit, 29 ... communication data Processing unit 40 ... Signal analysis device 50 ... Signal generation device 60 ... Coupler 70 ... Distributor 80 ... RF signal path 90 ... Coaxial cable

Claims (6)

A BB signal generation unit (23) for generating a digital baseband signal, a level control unit (24) for controlling the level of the baseband signal within a predetermined level range, and the level-controlled baseband signal as D / A frequency conversion unit (25) that performs A conversion and frequency conversion to an RF signal, and a step attenuator (26) that can set a plurality of attenuation amounts and attenuates the RF signal by a set attenuation amount and outputs it as a test signal A pseudo base station apparatus (20) for transmitting the test signal whose level is controlled by the level control unit and the step attenuator to a mobile communication terminal (2) to be tested;
A test system having an overall control device (10) for controlling the pseudo base station device in order to perform a test to be transmitted to the mobile communication terminal by changing a level of the test signal,
The overall control device is:
The level range that can be controlled by the level control unit, the attenuation amount of the step attenuator, and the level range and the level variable range of the test signal derived based on the attenuation amount are the respective attenuations of the step attenuator. A level correspondence information storage unit (13) that prestores level correspondence information associated with each amount;
A level setting unit (14) that refers to the level correspondence information and selects an attenuation amount corresponding to the level variable range including the maximum value and the minimum value of the level of the test signal in the test,
A test system, wherein only the selected attenuation amount is set as the attenuation amount of the step attenuator, and then the level control unit is controlled to change the level of the test signal to perform the test. The level correspondence information storage unit stores a path loss that is a loss of a path from the pseudo base station device to the mobile communication terminal,
The test system according to claim 1, wherein the level variable range is derived based on a level range that can be controlled by the level control unit, an attenuation amount of the step attenuator, and the path loss. The overall control device is:
In order to perform the test, control information of the pseudo base station apparatus including information regarding the level of the test signal and a communication message in which the pseudo base station apparatus communicates with the mobile communication terminal are stored as a time-series sequence. A scenario storage unit (11) for storing the scenario,
A scenario processing unit (12) for controlling the pseudo base station apparatus according to the scenario read from the scenario storage unit;
The level setting unit extracts information on the level of the test signal from the scenario read by the scenario processing unit to detect a maximum value and a minimum value of the test signal level, and detects the maximum value and the minimum value of the detected test signal level. The one attenuation amount is selected based on the value, and a constant for controlling the level control unit is determined in response to the information regarding the level of the extracted test signal in the selected attenuation amount. Sending information of the combination with the selected attenuation amount to the scenario processing unit,
The scenario processing unit controls the pseudo base station apparatus by replacing information on the level of the test signal of the read scenario with information on the combination received from the level setting unit. Two or two test systems. A BB signal generation unit (23) for generating a digital baseband signal, a level control unit (24) for controlling the level of the baseband signal within a predetermined level range, and the level-controlled baseband signal as D / A frequency conversion unit (25) that performs A conversion and frequency conversion to an RF signal, and a step attenuator (26) that can set a plurality of attenuation amounts and attenuates the RF signal by a set attenuation amount and outputs it as a test signal A pseudo base station apparatus (20) for transmitting the test signal whose level is controlled by the level control unit and the step attenuator to a mobile communication terminal (2) to be tested;
A test method for performing a test of changing the level of the test signal and sending it to the mobile communication terminal using an overall control device (10) for controlling the pseudo base station device ,
The level range that can be controlled by the level control unit, the attenuation amount of the step attenuator, and the level range and the level variable range of the test signal derived based on the attenuation amount are the respective attenuations of the step attenuator. A level correspondence information storage stage for storing level correspondence information associated with each quantity;
An attenuation amount selection step of selecting an attenuation amount corresponding to the level variable range including the maximum value and the minimum value of the level of the test signal in the test with reference to the level correspondence information;
A constant determining step of determining a constant for controlling the level control unit when only the selected attenuation is set as the attenuation of the step attenuator;
And a test execution step of performing the test by transmitting the test signal, the level of which is controlled by the determined constant and the selected attenuation amount, to the mobile communication terminal. The level correspondence information storage step stores a path loss that is a loss of a path from the pseudo base station apparatus to the mobile communication terminal,
5. The test method according to claim 4 , wherein the level variable range is derived based on a level range that can be controlled by the level control unit, an attenuation amount of the step attenuator, and the path loss. In order to perform the test, control information of the pseudo base station apparatus including information regarding the level of the test signal and a communication message in which the pseudo base station apparatus communicates with the mobile communication terminal are stored as a time-series sequence. A scenario storage stage for storing the scenario,
A scenario reading step for reading out the stored scenario;
In order to perform the attenuation selection step, a detection step of extracting information on the level of the test signal from the read scenario and detecting a maximum value and a minimum value of the test signal level;
Replacing the information about the level of the test signal of the read scenario with the information on the determined constant and the selected attenuation amount, and
6. The test method according to claim 4, wherein the test execution stage performs the test according to a scenario in which information is replaced in the replacement stage.