JPH0993183A - Radio communication quality test method and radio communication quality test device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply realize a test method of communication quality in a communication system having a radio communication block by using a device with a simple configuration. SOLUTION: At first, a test personnel sets a portable terminal equipment 1 and a voice terminal equipment 7 to be a speech state. Then a sound source device 10 is operated to sound a voice signal of a prescribed frequency from a speaker 11. The speaker 11 approaches a transmitter of the portable terminal equipment 1 to input a voice signal of a prescribed frequency to the portable terminal equipment 1. Furthermore, the test personnel inputs a voice signal outputted from the voice terminal equipment 7 to a hit detection recorder 8 to discriminate a hit based on an alarm tone or an alarm lamp ancillary to the hit detection recorder 8 and records number of times of hits. Furthermore, the test personnel observes the waveform of a monitor signal 8a outputted from the voice terminal equipment 7 on an oscilloscope 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication quality test method and a wireless communication quality test apparatus for a communication quality test in a communication system having a wireless communication section.

[0002]

2. Description of the Related Art Generally, in a communication quality test in a communication system having a wireless communication section, a tester judges and recognizes the quality by listening to a received sound, for example, a time signal. Although such a test method requires a lot of manpower, in the present situation where there is no device that automatically determines the quality of voice communication, the above test method can only be adopted. By the way, in a communication system of digital transmission such as PHS (Personal Handyphone System) which is being developed in recent years by communication carriers and the like, time-division processing is performed after an analog signal such as voice is converted into a digital signal. The data is transmitted every fixed frame period (for example, about 5 ms to 10 ms). For this reason, when noise enters a part of the frame due to deterioration of the wireless communication environment or device failure and the error of the digital signal cannot be corrected, signal loss occurs in frame units and communication quality deteriorates. Easier to do. For this reason, in the time-division-processed digital transmission communication system, the importance of the voice communication quality test for instantaneous interruption, which has not been a serious problem in the analog transmission communication system, has been increasing.

[0003]

However, similarly to the test method of the communication system of analog transmission, the method in which the human being judges the communication quality by listening to the received sound requires human labor for a long time. There is a problem. In addition, when a signal loss frequently occurs in a frame unit of a cycle of several ms to several tens of ms, it is possible to distinguish a momentary interruption with the human ear.
If the loss of signal is temporary, it is difficult for the human ear to identify the interruption. From the above, in the communication system of time-division-processed digital transmission, there is a problem that an accurate communication quality test cannot be easily performed. The present invention has been made in view of the above circumstances,
An object of the present invention is to provide a wireless communication quality test method and a wireless communication quality test device for a communication quality test in a communication system having a wireless communication section, using a device having a simple configuration.

[0004]

According to the first aspect of the present invention,
A wireless communication quality test method using a communication network accommodating a mobile terminal communicating via a wireless base station and a voice terminal communicating via a fixed line, the mobile terminal and the voice terminal being in a communication state. , A momentary interruption detection in which an audible sound is input from the transmitter of the mobile terminal or the transmitter of the voice terminal, and a momentary interruption of the audible sound output is detected and presented to the receiver of the voice terminal or the receiver of the mobile terminal It is a wireless communication quality test method characterized by mounting a device and measuring communication quality of a communication network including a wireless section. A second aspect of the present invention is a wireless communication quality test apparatus that uses a communication network that accommodates a mobile terminal that communicates via a wireless base station and a voice terminal that communicates via a fixed line. A sound source device for outputting and inputting audible sound to the transmitter of the mobile terminal or the transmitter of the voice terminal by acoustic coupling, and attached to the receiver of the voice terminal or the receiver of the mobile terminal to output the audible sound. And a momentary interruption detection device that detects and presents a momentary interruption of the wireless communication quality testing device.

According to a third aspect of the present invention, in the wireless communication quality testing method according to the first aspect, the instantaneous interruption detection device automatically records the number of instantaneous interruptions. According to a fourth aspect of the present invention, in the wireless communication quality test apparatus according to the second aspect, the instantaneous interruption detection device automatically records the number of instantaneous interruptions. According to a fifth aspect of the present invention, a portable terminal that communicates via a wireless base station and an instantaneous interruption detection device that detects and presents an instantaneous interruption attached to a fixed line are set in a communication state, and An audible sound is input from a transmitter of a terminal to measure the communication quality of a communication network including a wireless section by the instantaneous interruption detection device.

[0006]

1 is a diagram for explaining a wireless communication quality test method according to an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes a mobile terminal, for example, a mobile terminal used for PHS (Personal Handyphone System) or the like. The mobile terminal 1 has a transmitter and a receiver, and converts voice input from the transmitter into an analog voice signal. Then, this analog voice signal is converted into a digital voice signal, subjected to time division multiplexing processing and divided into frames, and a carrier wave of a predetermined frequency is modulated based on this frame and transmitted. Further, the mobile terminal 1 receives a carrier wave of a predetermined frequency by the antenna 1a, obtains a frame from the received carrier wave, performs time division separation, and demodulates to obtain a digital voice signal. Then, the digital voice signal is converted into an analog voice signal and the voice is output from the handset. The frame is composed of information indicating the destination and the source, a digital audio signal, and the like.

A radio base station 2 receives a carrier wave transmitted from the mobile terminal 1 or modulates a carrier wave of a predetermined frequency and transmits the carrier wave. Location registration area information notification, wireless channel allocation and management, wireless line quality management,
And conversion of the transmission rate of digital audio signals. The radio base station 2 is controlled by the base station control device 3. The base station control device 3 controls the radio base station 2 so that the radio base station 2 can normally perform transmission and reception. This base station control device 3 is connected to an ISDN line (service integrated digital network line) 4. The ISDN line 4 is connected to a digital exchange (digital exchange network) 5.

Although not shown in the figure, a large number of ISDN lines 4 and analog lines 6 are connected to the digital exchange 5, and in this digital exchange 5, information indicating the destination embedded in the frame of the digital signal is shown. On the basis of the above, the route setting of a large number of connected ISDN lines 4 or analog lines 6 is performed. Further, when the connected line is the analog line 6, the analog voice signal transmitted from the analog line 6 is converted into a digital voice signal at the connection portion between the digital exchange 5 and the analog line 6, and the digital voice signal is converted. Is transmitted to the analog line 6 after being converted into an analog voice signal. Also, at the end of the analog line 6,
The voice terminal 7 is connected. The voice terminal 7 is, for example, a telephone, and converts an analog voice signal transmitted from the analog line 6 into voice. An instantaneous interruption detection recording device 8 is connected to the voice terminal 7.

FIG. 2 is a block diagram showing the configuration of the electric signal processing section of the instantaneous interruption detection recording device 8. In FIG. 2, 20
Is an electric signal processing unit of the instantaneous interruption detection recording device 8. Also,
Reference numeral 21 is an input terminal for inputting a voice signal after the voice is converted into an electric signal again. An instantaneous interruption detection circuit 22 and a waveform monitor output circuit 23 are connected to the input terminal 21. The instantaneous interruption detection circuit 22 detects an instantaneous interruption of the voice signal and outputs an instantaneous interruption detection signal 22a when the instantaneous interruption of the voice is detected. The waveform monitor output circuit 23 converts the audio signal into a monitor signal 23a, and the monitor signal 23a is output from the monitor signal output terminal 24. The instantaneous interruption detection circuit 22 includes an instantaneous interruption detection signal output terminal 25, an alarm sound generation circuit 26,
An alarm lamp lighting circuit 27 and an instantaneous interruption frequency recording circuit 28 are connected.

The instantaneous interruption detection signal output terminal 25 is for outputting the instantaneous interruption detection signal 22a to the outside. Further, in response to the instantaneous interruption detection signal 22a, the alarm sound generation circuit 26 generates an alarm sound by a buzzer (not shown), and the alarm lamp lighting circuit 27 lights an alarm lamp (not shown). The instantaneous interruption frequency recording circuit 28 also includes an instantaneous interruption frequency recording unit (not shown) according to the instantaneous interruption detection signal 22a.
To record the number of instantaneous interruptions.

An oscilloscope 9 is connected to the instantaneous interruption detection recording device 8. This oscilloscope 9
Is for observing the waveform of the audio signal, the monitor signal 8a output from the monitor signal output terminal 24 in FIG. 2 is input, and the waveform corresponding to the monitor signal 8a is immediately displayed on the display board. It Further, the instantaneous interruption detection signal 8b output from the instantaneous interruption detection signal output terminal 25 in FIG. 2 is input, and the waveform at the time of the instantaneous interruption of the audio signal is recorded in synchronization with this instantaneous interruption detection signal 8b. Reference numeral 10 is a sound source device such as an oscillator, which generates an electric signal of a constant frequency. The sound source device 10 has a volume, and by adjusting the volume, the output of the electric signal of the constant frequency is adjusted. Further, the sound source device 10 has
The speaker 11 is connected, and an electric signal of a constant frequency output from the sound source device 10 is converted into voice. Therefore, the volume of the sound output from the speaker 11 is changed by adjusting the above-mentioned volume.

In the above structure, when conducting a communication quality test, the tester first puts the mobile terminal 1 and the voice terminal 7 into a call state. Next, the sound source device 10 is operated to cause the speaker 11 to output sound of a constant frequency. Further, the volume is adjusted so that the sound output from the speaker 11 has an appropriate volume, and the speaker 11 is brought close to the transmitter of the mobile terminal 1.

The fixed frequency voice output from the speaker 11 is converted into a constant frequency analog voice signal in the mobile terminal 1 and further converted into a digital voice signal. Then, this digital audio signal is subjected to time division multiplexing processing and divided into frames. Then, the carrier wave is modulated according to this frame and transmitted from the antenna 1a of the mobile terminal 1. The carrier wave modulated according to this frame is received by the radio base station 2 and transmitted to the digital switch or the digital network 5 via the base station control device 3 and the ISDN line 4.

Since the portable terminal 1 and the voice terminal 7 connected to the end of the analog line 6 are in a call state, the information indicating the destination forming a part of the frame specifies the analog line 6. To do. Therefore, this frame is transmitted to the route of the analog line 6. Further, in the digital exchange 5, the above frames are integrated into a digital voice signal and further converted into an analog voice signal. Then, the analog voice signal is transmitted through the analog line 6, received by the voice terminal 7, and a voice having a constant frequency is output.

This voice is input to the instantaneous interruption detection recording device 8. The tester observes the waveform of the sound with the oscilloscope 9, and records the number of instantaneous interruptions by the instantaneous interruption detection recording device 8 by the alarm sound emitted at the time of the instantaneous interruption or the alarm lamp lit at the time of the instantaneous interruption. In the case of a long-time test, the instantaneous interruption frequency recording unit automatically records the instantaneous interruption frequency, and automatically records the waveform of the voice at the instantaneous interruption time in the oscilloscope 9. In addition, when performing the test, the tester sets the sound source device 10 and the speaker 11 to the audio terminal 7,
The instantaneous interruption detection recording device 8 and the oscilloscope 9 may be arranged in the mobile terminal 1 and the same test may be performed. As the signal input to the instantaneous interruption detection recording device 8, an electric signal of an analog line may be directly input instead of the voice signal.

[0016]

As described above, in the wireless communication quality test method and the wireless communication quality test apparatus according to the present invention, it is possible to easily perform an unmanned and accurate long-term test easily without using an expensive measuring device. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is a diagram for explaining a wireless communication quality test method according to the present invention.

FIG. 2 is a block diagram showing a configuration of an electric signal processing unit of the instantaneous interruption detection recording device 8.

[Explanation of symbols]

1 ... mobile terminal, 2 ... radio base station, 3 ... base station control device,
4 ... ISDN line, 5 ... Digital exchange (digital conversion network), 6 ... Analog line, 7 ... Voice terminal, 8 ... Instantaneous interruption detection recording device, 9 ... Oscilloscope, 10
... sound source device, 11 ... speaker.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Hideyuki Saito Inventor Hideyuki Saito 1-3-1, Gotenyama, Musashino-shi, Tokyo NTT Advanced Technology Co., Ltd. (72) Takemi Arita Gotenyama, Musashino-shi, Tokyo 1-31 NTT Advanced Technology Co., Ltd. Inside the company

Claims (5)

[Claims] 1. A mobile terminal for communicating via a wireless base station,
And a wireless communication quality test method using a communication network accommodating a voice terminal that performs communication by a fixed line, wherein the mobile terminal and the voice terminal are in a communication state, and the transmitter or the voice of the mobile terminal is used. Input an audible sound from the transmitter of the terminal, to the receiver of the voice terminal or the receiver of the mobile terminal,
A wireless communication quality test method, comprising: mounting an instantaneous interruption detection device that detects and presents an instantaneous interruption of an audible sound output, and measuring the communication quality of a communication network including a wireless section. 2. A mobile terminal that communicates via a wireless base station,
And a wireless communication quality test apparatus using a communication network accommodating a voice terminal that communicates by a fixed line, outputting a sound wave of a constant frequency to a transmitter of the mobile terminal or a transmitter of the voice terminal. A sound source device for inputting an audible sound by acoustic coupling, and a momentary interruption detection device attached to the receiver of the voice terminal or the receiver of the portable terminal and detecting / presenting a momentary interruption of the audible sound output. Wireless communication quality test equipment. 3. The wireless communication quality test method according to claim 1, wherein the instantaneous interruption detection device automatically records the number of instantaneous interruptions. 4. The wireless communication quality test apparatus according to claim 2, wherein the instantaneous interruption detection device automatically records the number of instantaneous interruptions. 5. A mobile terminal for communicating via a wireless base station,
And a momentary interruption detection device that detects and presents a momentary interruption that is attached to a fixed line are set in a communication state, an audible sound is input from the transmitter of the mobile terminal, and wireless communication is performed by the momentary interruption detection device. A wireless communication quality test method characterized by measuring the communication quality of a communication network including a section.