JP4043458B2 - Mobile communication terminal test equipment - Google Patents

Description

  The present invention assumes a cell-type mobile communication terminal that has a pseudo base station function capable of communication connection with a mobile communication terminal and moves between cells (units of service areas of each base station). The mobile communication terminal test apparatus and the test method for testing whether the connection state of the mobile communication terminal appropriately transitions between cells in response to the movement of the mobile terminal. The test is performed a number of times to switch the reception status and the reception state is switched. Statistical evaluation is performed based on the results of each time, and the test is performed until the predetermined pass probability (pass probability) is reached. The present invention relates to a technique for displaying the shortest number of tests until the pass probability is reached.

  Conventionally, in a communication system using a mobile communication terminal 1, each base station 1, 2, 3, 4,... Is a service area called a cell, as shown in FIG. When the mobile communication terminal 1 enters 4..., It is registered to enable communication. For example, when the mobile communication terminal 1 moves from the cell 1 to the cell 2, if the communication service is obtained from both the base stations 1 and 2 in which the cell 1 and the cell 2 are double, the power of the incoming radio wave is large. One or both can be used.

  When the mobile communication terminal 1 is manufactured, the mobile communication terminal 1 automatically switches the connection state from the base station 1 to the base station 2 when moving between cells as described above (hereinafter referred to as “connection state Transition ”)), it is necessary to test whether the switching is performed correctly, the quality at that time, for example the error rate of the data.

  Therefore, in the test, since the mobile communication terminal 1 cannot move and the position is fixed, the mobile communication terminal test apparatus generates test signals corresponding to cells 1, 2, 3, 4,. There is a method of performing pseudo communication with the mobile communication terminal 1 using a protocol in accordance with the system and testing the transition and quality of the connection state. That is, there is a pseudo base station that communicates with the mobile communication terminal 1 and tests.

  As a test method in such a communication system, for example, a RRM (Radio Resource Management) test according to a rule described in a non-patent document, which is a rule in a W-CDMA communication system, in other words, with a base station There is a connection test or a procedure test (Procedure Test).

  FIG. 6 shows a conventional configuration of the test. 6, the transmission / reception means 3 included in the test means 100 has the functions of the respective transceivers corresponding to the cells 1, 2, 3, 4,... It includes a function for communicating with the mobile communication terminal 1 by exchanging messages required by a predetermined protocol. The reception measuring means 4 analyzes and measures the signal sent from the mobile communication terminal 1 through the communication connection together with the function of the above-mentioned transceiver, and confirms the connection state transition in the mobile communication terminal 1 and tests the quality. To do. The transmission / reception means 3 and the reception measurement means 4 are synchronized in time.

  The reception measurement means 4 has functions such as time measurement. Since the mobile communication terminal 1 transmits and receives with a radio propagation signal, the spectrum, band, power measurement, etc. for testing the characteristics of the propagation signal in the radio frequency domain (including a spectrum analyzer capable of measuring these) are built in. .) Can be measured. The time measurement receives a signal from the mobile communication terminal 1 and measures its time. For example, the spectrum analyzer converts the reception frequency from the mobile communication terminal 1 into an intermediate frequency, and sweeps time at that frequency, thereby performing time domain measurement similar to an oscilloscope to measure time.

As described above, the transmission / reception means 3 and the reception measurement means 4 have both a pseudo base station function and a measurement function (test function). Hereinafter, the combination of the transmission unit 3 and the reception measurement unit 4 may be collectively referred to as a pseudo base station.

The coupling means 2 may be connected bidirectionally with a cable, or may be connected via an antenna.

  The test procedure control means 5 controls the pseudo base station in accordance with a test method in the communication system described above, for example, the RRM test procedure of W-CDMA.

  In particular, when the mobile communication terminal 1 moves between cells as described above, the mobile communication terminal 1 transitions so that reception switching and registration are completed and reception can be performed with a predetermined quality within a predetermined period of time. These sequential operations must be satisfied because it is determined to do so. Therefore, the test procedure control means 5 has the time setting means 5a, and makes the pseudo base station perform a sequential operation according to the rule.

  When the pseudo base station is operating as set by the time setting means 5a of the test procedure control means 5, the judging means 6 makes a transition between connected cells in the mobile communication terminal 1 within a predetermined time. To determine whether or not If the transition is performed within the predetermined time, it is determined to be good, and if the transition is over the predetermined time or the transition is not performed, it is determined to be no.

The path determination unit 10 determines whether or not the error rate represented by the following formula is lower than the path probability threshold. The pass probability threshold is defined as “early pass” or “erlimbad _pass ” in non-patent patent documents or patent documents.
Error rate = N / Ns
Path probability threshold = 2 × N × M / qchisq (1-D, 2 × N)
Ns: Number of all tests N: Number of times of the Ns test times determined to be NO by the determination means D: Risk of misjudgment M: Coefficient qchisq: Chi-square distribution. qchisq (1-D, 2 × N) represents a chi-square distribution with D and N as parameters.
FIG. 3A shows the characteristics of the path probability threshold values on the coordinates where the vertical axis is a logarithmic scale of the error rate and the horizontal axis is the logarithmic scale of the number N of times determined to be negative by the determination means 6.
If the K-th error rate Ner / K (the number of times Ner is not) falls within the path probability threshold value, the pass probability is established (for example, 99%).

  Then, the path determination unit 10 displays the determination result on the display unit 7 and, when the error rate is larger than the path probability threshold, notifies the test procedure control unit 5 so that the error rate is equal to the path probability threshold. The test was conducted until the value was below.

“3GPP TS 34.121, V3.11.0, December 2002, 3GPP Organic Partners (ARIB, CWTS, ETSI, T1, TTA, TTC), France, P.316-330. International Publication Number PCT WO 02/089390 A1 (5p, 5 lines to 9p, 9 lines, FIG. 1)

  In the above prior art, the display on the display means 7 only displays the determination result of the path determination means 10, and the result of the test determination means 6 is displayed as numerical data corresponding to each measurement item. . Therefore, as an example of the latter, the transition of the connection between the scheduled cells when the test is performed 1000 times (leaving one cell and connecting to the other cell successfully), unsuccessful (failing. Display the numerical value of the ratio of the error of leaving from the cell and the connection error to other cells. Or the said ratio of unsuccessful exceeded a predetermined allowable range, and the number of times was displayed numerically.

  If it is only such numerical data, it is impossible to grasp how many times it will take or the time required for the test. Therefore, there is an inconvenience that the operator is stuck on the mobile communication terminal test apparatus and cannot be separated. Furthermore, there is a problem that it cannot be grasped directly and quantitatively.

  An object of the present invention is to provide a mobile communication terminal test apparatus capable of grasping at least how many future tests will be performed in a connection test or the like of a mobile communication terminal by a pseudo base station. At the same time, it is possible to visually and visually grasp the distribution of the quality of the determination.

In order to achieve the above object, the invention according to claim 1 is a test means for testing a predetermined operation of a cell-type mobile communication terminal a plurality of times and determining whether or not the test is good every time the test is performed. Path determination means for determining an error rate and a path probability threshold represented by the following formula, and determining whether the error rate is equal to or lower than the path probability threshold:
Error rate = Ner / K
Path probability threshold = 2 × Ner × M / qchisq (1-D, 2 × Ner)
K: Number of tests is K times Ner: Number of times the test means has determined that the test is not successful D: Misjudgment risk rate M: Coefficient qchisq: Chi-square distribution. qchisq (1-D, 2 × Ner) represents a chi-square distribution with D and Ner as parameters.
In the mobile communication terminal test apparatus that repeats the same test until the error rate is equal to or less than the path probability threshold value,
Display means, based on the error rate and the path probability threshold, the remaining number of tests to be estimated until the error rate is equal to or less than the path probability threshold, or an estimated remaining test according to the number of remaining tests Statistical processing means for obtaining time, and display control means for displaying at least the number of remaining tests or the remaining test time on the display means.

The invention according to claim 2 is the invention according to claim 1, wherein the test means includes:
A procedure for testing a cellular mobile communication terminal a predetermined number of times, a test procedure control means for outputting control information in accordance with the procedure, and signals corresponding to a plurality of cells are generated and their strengths are controlled as described above. Transmission / reception means that changes and transmits according to a scheduled time according to information, and reception that measures time when the mobile communication terminal switches and receives signals corresponding to a plurality of cells according to the change in strength A measurement unit, and a determination unit that receives a measurement result from the reception measurement unit and determines that the switching is successful when the switching of the mobile communication terminal is successful within a predetermined time, and a determination unit that determines no otherwise. The statistical processing means further receives the measurement result and the determination result, calculates a distribution of the measured time versus the number of tests, and the display control means is configured to obtain the remaining test obtained by the statistical processing means. And at least one number or remaining test time, has a configuration for simultaneously displaying on the display means both the distribution of the measured time versus number of tests.

  The invention according to claim 3 is the invention according to claim 1 or 2, wherein the statistical processing means, as the number of remaining tests, is the shortest remaining number of tests until the error rate falls below the path probability threshold. = [Ner / path probability threshold value] -K is obtained.

  According to a fourth aspect of the present invention, in the third aspect of the invention, the statistical processing means determines the error rate and the path probability threshold value when the determination result of the certain test means is negative. If the determination result of the test means of a certain time is good based on the number of times of the shortest remaining test based on the above, [the shortest remaining test number -1 obtained last time] is set as the shortest remaining test number of the certain time. .

  According to a fifth aspect of the present invention, in the first, second, or third aspect of the invention, the statistical processing unit is a coordinate system in which the vertical axis indicates an error rate and the horizontal axis indicates the number of times the test unit determines NO. Then, the intersection between the error rate = Ner / K line and the path probability threshold characteristic is obtained, and the error rate identical transition test number until reaching the intersection is obtained as the remaining test number. The configuration.

  According to the first aspect of the present invention, since the remaining number of tests or the remaining test time is displayed during the repeated tests, the operator can grasp the remaining required time.

  According to the second aspect of the present invention, the success / failure distribution of the determination result can be quantitatively grasped.

  According to the invention described in claim 3 or 4, since the shortest remaining number of times can be grasped, the operator can use at least the time for other purposes, which is convenient.

  According to the fifth aspect of the present invention, since the remaining number of tests when the same error rate is changed every time is displayed, it is easy to predict how long the test will be completed.

An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing a functional configuration of the present invention. FIG. 2 shows an example of displaying the remaining number of times (time) and the distribution of measured transition time and number of tests. FIG. 3A is a diagram for explaining the error rate, the path probability threshold characteristic, and the remaining number of times. FIG. 4 is a diagram for explaining an example of the transition of the connection state between cells of the mobile communication terminal 1.

  The functional configuration of this embodiment will be described with reference to FIG. In FIG. 1, the same reference numerals as those in FIG. 6 described in the prior art have the same functions.

  In FIG. 1, the determination means 6 determines whether or not a transition between connected cells in the mobile communication terminal 1 is performed within a predetermined time (for example, within 8 seconds), for example, within 8 seconds. If so, it is judged as good (success), and if it exceeds 8 seconds, it is judged as no (failure). In addition, in the test of making a call with the pseudo base station, the message content is also determined. The reference time and message when making the determination are received in advance from the test procedure control means 5. Test and determination procedures and operations will be described later as examples.

  The statistical processing means 9 includes a number estimation unit 9a and a distribution calculation unit 9b. The distribution calculation unit 9b counts the distribution of the result determined by the determination unit 6 and the number of failures / successes, and generates statistical data thereof. For example, as shown in the upper part of FIG. 2, if the transition of the connection state between cells is successful within 8 seconds, for example, if it exceeds 8 seconds, the success and failure are indicated by color, pattern, The result of determination by the determination unit 6 is classified according to the transition time based on the time measured by the reception measurement unit 4 and counted to generate data as a distribution of the transition time versus the number of tests. Then, it is displayed on the display means 7 as a bar graph via the display control means 8.

  Based on the number of failures and the total number of tests (number of failures + number of successes) counted by the distribution calculation unit 9b, the number estimation unit 9a obtains the remaining number and time in the following procedure in a certain Kth test.

(A) Find the shortest remaining number of tests.
The frequency estimation unit 9a determines that all future tests are successful in the error rate in the current test (point A in FIG. 3A) (the error rate in that case is B in FIG. 3A). The number of times). That is, the shortest remaining test number X0 expressed by the following equation (1) is obtained. The obtained result is sent to the display control means 8. Further, the shortest remaining test obtained by multiplying the average time per test of the time measured by the reception measuring means 4 or the test time per time estimated by the time controlled by the test control means 5 and the shortest remaining test number X0. The time may be estimated and sent to the display control means 8.

Formula (1) Shortest remaining test number X0 = [Ner / pass probability threshold] −K
However, error rate = Ner / K
Path probability threshold = 2 × Ner × M / qchisq (1-D, 2 × Ner)
Ner: Number of times the test means 6 determined “no” (failure) among the K test times D: False determination risk factor M: Coefficient qchisq: Chi-square distribution. qchisq (1-D, 2 × Ner) represents a chi-square distribution with D and Ner as parameters.

  However, it is desirable to apply Formula (1) when the number of tests exceeds five. In other words, since it is a probabilistic problem, the probability application itself is not accurate when the number of tests is small. The error rate may be an average value.

Moreover, after calculating once by said Formula (1), if the result of the determination means 6 is successful in the next (K + 1) th test, for example, it will obtain | require by following Formula (2).
Formula (2) Shortest remaining test count = K shortest remaining test count−1
That is, if the determination result is successful, the number of successes may be subtracted. Even if the success continues, it is only necessary to draw the number of successes. Therefore, it is sufficient to obtain the above equation (1) only when the determination result is failure.

(B) In the future, the remaining number of tests (the number of tests with the same error rate) when the same error rate is used will be obtained.
Number of times the error rate in the current test (point A in FIG. 3A) falls within the path probability threshold when the error rate changes at the same rate in each future (point C in FIG. 3A) Ask for.

That is, the number of times estimation unit 9a is on the coordinate system with the vertical axis as the error rate (N / Ns) and the number of times (N) determined as failure (no) by the determination means 6 as the horizontal axis as shown in FIG. Thus, the intersection of the straight line of the error rate = Ner / K and the path probability threshold characteristic, that is, the coordinates of the C point (Ner / K, L) is obtained. That is, the total number of errors L is obtained. Then, since L is known, the remaining error rate identical transition test number Y0 is obtained as in the following equation.
Since L / (K + Y0) = Mer / K
Number of same error rate test Y0 = [(L / Mer) -1] × K
The display of the error rate identical transition test count Y0 and the remaining time corresponding to the error rate identical transition remaining count Y0 can be made in the same manner as in the above (a).

  The number estimation unit 9a includes means for calculating the error rate and the path probability threshold value, and stores constants such as a misjudgment risk rate and M. Further, in FIG. 1, the frequency estimation unit 9 a is configured as a separate function from the path determination unit 10, but a configuration together with the path determination unit 10 is desirable. This is because they have the same formula and the same information. The path determination unit 10 compares and determines the error rate and the path probability threshold value. If the error rate is larger than the path probability threshold value, the path determination unit 10 notifies the test procedure control unit 5 so that the error rate is The test was conducted until the probability threshold was exceeded. You may perform this in the frequency | count estimation part 9a.

  The display controller 8 receives the distribution of the shortest remaining number of tests from the number estimation unit 9a of the statistical processing unit 9 and the distribution of the transition time versus the number of tests from the distribution calculation unit 9b, as shown in FIG. Displayed on the display means 7. The graph generation means 8e of the display control means 8 stores in advance a format consisting of the graph of FIG. 2 and the data display column, and updates and displays the display data with the data from the statistical processing means 9 each time. . Further, as shown in FIG. 3B, the display control means 8 displays the shortest remaining test number X0 and the error rate identical transition test number Y0, and connects the points (X0 / 2, Y0 / 2) at each time. May be displayed. The data display control means 8a controls each element of the display control unit 8 in an integrated manner. Elements of the display control unit 8 that have not been described so far will be briefly described in the following embodiments.

(Example)
This embodiment shows an example of a test in which a call state including a message exchange transitions in addition to a test of a connection state transition between cells of a mobile communication terminal in a test by the test means 100. Including the order.

  An embodiment will be described with reference to FIGS. FIG. 4 is a display example showing a time-series operation of a test in each test item. First, the outline of FIG. 4 will be described. The horizontal axis indicates the cell name, and the vertical axis indicates the time course of the scheduled test. Among them, two lines indicate a state in which only the control information is transmitted from the pseudo base station, and a thick black line indicates a state in which a call is made (both are planned and are markers generated by the scheduled marker generating means 8b. , Collectively referred to as a scheduled marker). ● indicates the success of the determination by the determination means 6 at the present time, ○ indicates the success of the previous determination by the determination means 6, and × indicates the current failure (both are markers generated by the reception marker generation means 8b, Collectively called reception marker.) FIG. 4 shows the current state when the test up to the end is completed. This success or failure is a determination made by the determination means 6 for each individual according to each time schedule shown on the left side of FIG.

(1) Each part is controlled in accordance with a procedure owned in advance by the test procedure control means 5, and the time passage is set by the time setting means 5a.
(2) The coordinate generation unit 8d and the scheduled marker generation unit 8b display a state where there is no reception marker (◯ or ●) in FIG. 4 based on the information from the time setting unit 5a. Then, the transceiver 1 starts to transmit from T1, and the transceiver 2 transmits from T2 with the same signal strength (level) as the transceiver 1.

  (3) The mobile communication terminal 1 starts idling and starts receiving a signal (a signal corresponding to the cell 1) transmitted from the transceiver 1. Then, the location registration for the pseudo base station, “call” (call) is set, and the measurement items are handled. The mobile communication terminal 1 receives and measures the results of the sequential processing by the transmission / reception means 3 and the reception measurement means 4, and the determination means 6 determines success or failure based on the measurement results and receives the determination results. The mark is sent to the marker generation means 8c, and the processing time is marked with ● (in FIG. 4, since it is seen from the end time, the part that has been completed successfully is indicated by ◯. The same applies hereinafter). The determination result of the determination unit 6 is also sent to the path determination unit 10 and the statistical processing unit 9 as described above.

  (4) In T2, the pseudo base station recognizes a signal (a signal corresponding to cell 2) transmitted from the transceiver 2 by the mobile communication terminal 1 to the mobile communication terminal 1 through the transceiver 1. The transmission / reception means 3 receives the REPORT as to whether or not the request is received, and sends the reception result to the determination means 6. The determination means 6 receives the reception result, determines whether the mobile communication terminal 1 has reported between T2 and T3 (3 seconds), or whether the REPORT content is “recognition”. If any of these are not met, an x is attached.

  (5) The mobile communication terminal 1 switches a state in which a call can be made with both the transceivers 1 and 2 between T3 and T4. The determination means 6 receives this state from the transmission / reception means 3, determines whether or not the switching time has been performed between T3 and T4 (within 2 seconds), sends the result to the reception marker generation means 8c, and ● or × To display.

  (6) The test procedure control means 5 confirms with the transceivers 1 and 2 whether or not the mobile communication terminal 1 is in a talking state with the transceiver 1 and the transceiver 2 (pseudo base station 1 and pseudo base station 2). Send a message. On the other hand, the determination means 6 that has received the message from the mobile communication terminal 1 via the transmission / reception means 3 is between T4 and T5 (0.06 seconds), and the message is “calling state”. Judgment is successful, otherwise it is judged failure. The result is displayed on the display means 7 by the reception marker generating means 8c.

  (7) Since the strength of the transmission signal of the transceiver 1 is lowered at T5, only the transceiver 2 is changed from the state in which the mobile communication terminal 1 is receiving the signals of both the transceiver 1 and the transceiver 2 from the connected state. The transmission / reception means 3 receives the signal from the mobile communication terminal 1 and measures the error rate by the determination means 6. The determination unit 6 determines whether the switching time and the error rate are equal to or less than a specified value (normal), and causes the display unit 7 to be marked with ● or X through the reception marker generation unit 8b.

  (8) The test from T1 to the end is repeated, for example, until the error rate becomes equal to or less than the path probability threshold. That is, the test procedure control unit 5 repeats the test until the path determination unit 10 has the error rate below the path probability threshold.

  (9) Among them, the success of the test from T1 to T3 in FIG. 4 (the test in which the time until cell transition is within 8 seconds), the frequency of failure and the distribution of transition time, and the error rate pass. FIG. 2 shows the shortest remaining number of tests (or time) below the probability threshold. Naturally, the data in FIG. 2 is an example in which the determination is made within 8 seconds. However, the data may be determined based on T6 (10.56 seconds) in FIG. Every time is fine.

It is a figure which shows the function structure in embodiment of this invention. It is a figure which shows the example of a display in embodiment of FIG. It is a figure for demonstrating an error rate, a path probability threshold value, and the number of remaining tests. It is a figure explaining the example of the transition of a connection state and a receiving state in the test of the mobile communication terminal. It is a figure explaining a cell (service area) and a pseudo base station. It is a figure for demonstrating a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Mobile communication terminal, 2 Coupling means, 3 Transmission / reception means, 4 Reception measurement means, 5 Test procedure control means, 5a Time setting means, 6 Determination means,
7 display means, 8 display control means, 8a data display control means, 8b
Scheduled marker generation means, 8c reception marker generation means, 8d coordinate generation means, 8e graph generation means, 9 statistical processing means, 9a number estimation section,
9b Distribution calculation unit, 10 path determination means.

Claims (5)

Test means (100) for testing a predetermined operation of a cell-type mobile communication terminal a plurality of times and determining the quality of the test for each number of tests, and an error rate and path probability threshold expressed by the following equations: Path determination means (10) for determining a value and determining whether the error rate is equal to or less than a path probability threshold;
Error rate = Ner / K
Path probability threshold = 2 × Ner × M / qchisq (1-D, 2 × Ner)
K: Number of tests is K times Ner: Number of times the test means has determined that the test is not successful D: Misjudgment risk rate M: Coefficient qchisq: Chi-square distribution. qchisq (1-D, 2 × Ner) represents a chi-square distribution with D and Ner as parameters.
In the mobile communication terminal test apparatus that repeats the same test until the error rate is equal to or less than the path probability threshold value,
Display means (7);
Based on the error rate and the path probability threshold, the remaining number of tests estimated until the error rate becomes less than or equal to the path probability threshold, or a statistic for obtaining an estimated remaining test time according to the number of remaining tests Processing means (9);
A mobile communication terminal test apparatus, comprising: display control means (8) for causing the display means to display at least the number of remaining tests or the remaining test time. The test means includes
A test procedure control means (5) for holding a procedure for testing a cell-type mobile communication terminal a predetermined number of times and outputting control information along with the procedure,
Transmitting / receiving means (3) for generating a signal corresponding to a plurality of cells and changing their intensity according to the scheduled time passage according to the control information;
A reception measurement means (4) for measuring a time when the mobile communication terminal switches and receives signals corresponding to a plurality of cells according to the change in strength, and receives the measurement result from the reception measurement means, and the mobile communication terminal receives the measurement result. Determination means (6) for determining that the switching of the body communication terminal is successful within a predetermined time, and determining that it is not otherwise.
The statistical processing means further receives the measurement result and the determination result, calculates a distribution of the measured time versus the number of tests,
The display control means simultaneously displays on the display means both at least one of the remaining test count or remaining test time obtained by the statistical processing means and the distribution of the measured time vs. test count. The mobile communication terminal test apparatus according to claim 1. The statistical processing means obtains the shortest remaining number of tests until the error rate becomes equal to or less than the path probability threshold = [Ner / path probability threshold] −K as the number of remaining tests. The mobile communication terminal test apparatus according to claim 1 or 2.   If the determination result of the certain test means is negative, the statistical processing means obtains the shortest remaining number of tests based on the error rate and the path probability threshold, and the determination of the certain test means 4. The mobile communication terminal test apparatus according to claim 3, wherein when the result is good, [the shortest remaining test number -1 obtained last time] is set as the shortest remaining test number of the certain time. The statistical processing means has an error rate on the vertical axis and a straight line of the error rate = Ner / K and a characteristic of the path probability threshold on the coordinate with the horizontal axis representing the number of times the test means has determined to be no. The mobile communication terminal test apparatus according to claim 1, 2 or 3, characterized in that an intersection is obtained, and an error rate identical transition test number until the intersection is reached based on the intersection is obtained as the remaining number of tests. .

Images