JP3433846B2 - Digital radio test equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, in a test device for communication equipment, performs both testing and evaluation / analysis of a signal under test by performing both functions of communication protocol analysis display and physical quantity measurement display. A device that makes it even easier.

[0002]

2. Description of the Related Art An example of a conventional digital radio testing apparatus is a measuring instrument for testing / evaluating a terminal of a car telephone. This will be described with reference to FIG. The configuration of this apparatus is configured by a pseudo base station 80, a spectrum analyzer 90, a terminal under test 100 (DUT), and an attenuator 95. The communication standard in this example is
The digital car telephone system standard called RCR-STD-27B will be described as an example.

The terminal under test 100 is, for example, a mobile telephone, and tests whether various tests of the RCR-STD-27B standard are satisfied by applying various test conditions from the pseudo base station 80. The attenuator 95, instead of communication by the antenna,
A power output dummy resistor is provided on both sides, and the two are connected by a known predetermined attenuation amount.

The pseudo base station 80 is a device for testing and measuring a protocol (procedure) for performing communication in layers 1, 2, and 3 by executing the original operation of the base station in a pseudo manner. The pseudo base station 80 transmits a radio wave in the 800 MHz band or the 1.5 GHz band, or receives a radio wave signal from the terminal under test 100 to make a call or receive a call using the communication protocol of the RCR-STD-27B standard. Perform various tests and measurements, such as normal operation for all test items such as calls, whether it is within the performance range within specifications, and how much deviation is present. As an example of measurement items, in the receiving system, receiving sensitivity, fading,
Adjacent channel selectivity, intermodulation characteristics, spurious sensitivity, interference level, line quality (error rate), handover time, etc. On the other hand, in the transmission system, frequency deviation, spurious intensity, occupied bandwidth, transmission power, when carrier is off Leakage power, transmission rise / fall power, modulation accuracy, adjacent channel leakage power, transmission intermodulation, time alignment,
Signal transmission speed and the like.

The internal structure of the pseudo base station 80 is composed of a test pattern generator 81, a transmitter 82, a receiver 85, a demodulator 86, a protocol analyzer 87, and a display 88. The test pattern generation unit 81 has a control channel frequency and a pattern corresponding to the communication protocol for each information channel frequency prepared in an internal memory, and the response signal 86a of the terminal under test 100 obtained from the demodulation unit.
In response, the desired test pattern 81a is generated. The control channel is a control channel for control signals such as call origination, call setting, disconnection and release, and performs time division operation of transmission / reception / idle in units of 20 msec slots. The information channel is a communication channel for information data and control data of the terminal under test 100, and has a large number of channels,
It is assigned to each user and used exclusively.

The transmitter 82 receives the test pattern 81a, converts it into a radio signal, sets it to an arbitrary transmission output level, outputs it from the input / output terminal 83, and supplies it to the DUT 100 via the attenuator 95. The receiving unit 85 is the DUT 100.
The radio signal from the input terminal is received from the input / output terminal 83, converted to an intermediate frequency, amplified, and supplied to the demodulation unit 86. Demodulator 8
6 demodulates the signal modulated by 4 / π shift DQPSK, and then supplies it to the protocol analyzer unit 87.

The protocol analyzer section 87 analyzes the received control data of the control channel or the information channel, detects a response signal corresponding to the start procedure / stop procedure / restart procedure, and supplies it to the test pattern generating section 81. To do. Also, from the received signal, it is checked whether or not the operation is normal and whether or not the response is normally made in correspondence with the communication protocol at each step of the test conditions, or at each layer of layers 1, 2, and 3 as well. Check the status of
The result of determination of / NG is supplied to the display unit 88. The display unit 88 displays this display information for each step of the sequence of the communication protocol.

On the other hand, the spectrum analyzer 90 receives a radio signal received in a burst on the control channel or a radio signal on the information channel, and measures various physical quantities, for example, frequency deviation, spurious intensity, occupied bandwidth, The results of performing the transmission power, the leakage power when the carrier is off, the transmission rising / falling power, the adjacent channel leakage power, etc. are displayed on the display screen of the spectrum analyzer. The measurement on the spectrum analyzer side is performed by receiving the measurement condition setting signal 92 from the pseudo base station 80 and performing the measurement under the measurement condition corresponding to the test condition.

[0009]

As described above, in the conventional measuring device, the display portion 88 of one pseudo base station 80 is used.
Since the display of the communication protocol test progress / result and the display of the measurement result of the physical quantity on the other spectrum analyzer side are separate, there is a problem in that it is necessary to check the two screens against each other. There was no device that integrated and displayed all the test items. Further, it is necessary to provide a spectrum analyzer 90 outside and supply the measurement condition settings synchronized with the test items to the spectrum analyzer 90, which causes a large-sized test apparatus and is inconvenient for practical use.

Therefore, the problem to be solved by the present invention is to integrate a communication protocol test and a physical quantity measurement,
Also, by displaying both displays on the same screen, the DUT
The purpose of the present invention is to realize an apparatus that can perform 100 tests / evaluations / analyses more easily.

[0011]

FIG. 1 shows a solution according to the present invention to the mobile radio side. In order to solve the above-mentioned problem, in the configuration of the present invention, the physical quantity measuring unit 20 for measuring the physical quantity of the signal output by the DUT 100 is provided corresponding to each step of the sequence of the communication protocol, and the protocol analyzer of the pseudo base station 80 is provided. The display unit 32 for displaying both or one of the display data of the communication protocol from the unit 87 and the display data of the physical quantity from the physical quantity measuring unit 20 is provided. As a result, the communication protocol result and the DU are synchronized for each communication protocol.
The measurement result of the physical quantity of the signal output by T100 can be displayed on the same screen.

On the other hand, in order to measure the communication protocol and physical quantity of the signal of the base station under test, in the configuration of the present invention, the physical quantity output by the base station under test is measured corresponding to each step of the sequence of the communication protocol. Physical quantity measuring unit 20
And the display unit 32 for displaying both or one of the display data of the communication protocol from the protocol analyzer unit 87 of the pseudo mobile unit and the physical quantity data from the physical quantity measuring unit 20 is provided. In this case, conversely, the mobile radio side is used as a pseudo-functional tester, and the base station is the base station under test.

[0013]

The physical quantity measuring unit 20 functions to measure the physical quantity in synchronization with each step of the sequence of the communication protocol. Protocol analyzer section 87 and physical quantity measuring section 20
The display unit 32 has a function of displaying the physical quantity on the same screen in synchronization with the display of each step of the communication protocol.

[0014]

The embodiment of the present invention is an example in which the communication protocol test function and the physical quantity measurement function are integrated and both results are displayed on the same screen. This will be described with reference to FIGS. 1, 2, and 3. As shown in FIG. 1, the configuration of the present digital wireless test apparatus 10 includes a test pattern generating section 81, a transmitting section 82, a receiving section 85, a demodulating section 86,
The protocol analyzer unit 87, the display unit 32, the physical quantity measuring unit 20, and the control unit 36 are included. With this configuration, the test pattern generation unit 81, the transmission unit 82, the reception unit 85, the demodulation unit 86, and the protocol analyzer unit 87.
Is similar to the conventional description. Also, regarding the attenuator 95 connected to the end of the input / output terminal 83 and the DUT 100,
The connection form is the same as in the conventional description. In this configuration, the physical quantity measuring unit 20 is built-in, and a control unit 36 corresponding thereto is added to the configuration unit.

The physical quantity measuring section 20 includes a frequency converting section 22.
And an AD conversion section 24 and a physical quantity processing section 26. The frequency conversion unit 22 receives the condition setting from the control unit 36, receives the signal under measurement from the input / output terminal 83, sweeps a predetermined sweep frequency range of the frequency of a predetermined communication channel, and sets a predetermined intermediate frequency. The converted signal is filtered with a predetermined bandwidth characteristic, and the signal detected under the predetermined detection condition is AD
It is supplied to the conversion unit 24. The AD conversion unit 24 receives the signal from the frequency conversion unit 22, converts it into a digital signal, temporarily stores it in the internal memory as time series data, and supplies this data to the physical quantity processing unit 26. The physical quantity processing unit 26
In response to the condition setting from the control unit 36 and the data read from the stored data from the AD conversion unit 24, the frequency deviation, the spurious intensity, the occupied bandwidth, the transmission power, the leakage power when the carrier is off, and the transmission rising / rising are received. Data resulting from arithmetic processing corresponding to measurement items such as downlink power and adjacent channel leakage power are supplied to the display unit 32.

The display unit 32 receives the condition setting from the control unit 36, the communication protocol result data from the protocol analyzer unit 87, and the data from the physical quantity processing unit 26, as shown in FIGS. Both of them are simultaneously displayed in a split screen, or one of the data is displayed as in the conventional case. The display example shown in FIG. 2 is an example of a protocol display 112 of communication progress on the upper screen and a spectrum display 114 of the occupied bandwidth which is a physical quantity on the lower screen. In this way, it is possible to check the changes in the spectrum and numerical value of the occupied bandwidth corresponding to the transition change of the protocol of the communication progress at the same time on the upper and lower screens at the same time, so it is easy to correlate the two with the communication progress. The advantage that can be grasped is obtained. The display example shown in FIG. 3 is an example of a protocol display 116 of communication progress on the upper screen, and an example of a physical quantity display 118 of transmission power and a modulation state, which are physical quantities, on the lower screen. The numerical value change of each physical quantity can be easily visually recognized in response to the change change of the protocol. The display form of the test result includes a form in which the test result is temporarily stored in a memory and subsequently displayed in response to a protocol transition, and a form in which test result data is displayed in real time.

In the description of the above embodiment, the base station side is used as a tester having a pseudo function, and the mobile radio side is the device under test (D).
UT) has been described in the case of the test form, but conversely, a test form in which the base station under test (DUT) is used as the base station by using the mobile radio side as a test device having a pseudo function may be used. Can be carried out.

[0018]

Since the present invention is configured as described above, it has the following effects. The physical quantity measuring unit 20 has an advantage that the physical quantity is measured in synchronization with each step of the sequence of the communication protocol, so that it is possible to easily obtain a comparison correspondence between the two. Further, the protocol analyzer unit 87, the physical quantity measuring unit 20, and the display unit 32 can easily realize the display in which the spectrum waveform obtained by the physical quantity measuring unit 20 and the change in each step of the sequence of the communication protocol are synchronized. . Both the test progress of the communication protocol and the physical quantity measurement result can be displayed on the same screen corresponding to the communication protocol.
The 100 tests / evaluations / analysiss can be easily performed without making any mistakes, which is convenient for the user.

[0019]

[Brief description of drawings]

FIG. 1 is a configuration diagram of a test apparatus according to the present invention, which incorporates a physical quantity measuring unit 20 and displays both test results on the same screen.

FIG. 2 is a first screen display example of the present invention.

FIG. 3 is a second screen display example of the present invention.

FIG. 4 is a block diagram of a conventional test apparatus when a communication analysis protocol and a physical quantity measurement are configured by a spectrum analyzer in a conventional communication procedure protocol.

[Explanation of symbols]

10 Digital wireless test equipment 20 Physical quantity measurement unit 22 Frequency converter 24 AD converter 26 Physical quantity processing unit 32, 88 display 36 Control unit 80 Pseudo base station 81 Test pattern generator 82 Transmitter 83 input / output terminals 85 Receiver 86 Demodulator 86a response signal 87 Protocol analyzer section 90 spectrum analyzer 92 Measurement condition setting signal 95 attenuator 100 terminal under test (DUT) 112,116 Protocol display 114 spectrum display 118 Physical quantity display

Claims (2)

(57) [Claims] 1. A pseudo base station (80) for transmitting / receiving the communication protocol of the digital radio device provided with a function, in the digital radio device testing apparatus for testing a terminal to be tested (100), each step of the sequence of communication protocols Corresponding to
The physical quantity of the signal output from the terminal under test (100) is communicated
Physical quantity measuring unit (20) that measures synchronously for each protocol
And the protocol analyzer section (87) of the pseudo base station (80)
(32) for displaying both or one of the display data of the communication protocol from the physical quantity measurement unit and the physical quantity display data synchronized for each communication protocol from the physical quantity measurement unit (20).
And a digital radio device testing apparatus comprising the above. Wherein a function of the simulated moving device for transmitting / receiving the communication protocol of the digital radio unit, the digital radio device testing apparatus for <br/> tested under test base station, each step in the sequence of communications protocols Corresponding to
The physical quantity output by the base station under test is the same for each communication protocol.
A physical quantity measuring unit (20) for measuring the sake, the display data of the communication protocol from the protocol analyzer portion of the simulated moving device (87), the physical quantity measuring unit (2
0) digital radio device testing apparatus wherein the display unit to display both or one of the physical quantity display data <br/> data synchronized with (32), in that it comprises the above each communication protocol from.