CN112737870B - System and method for testing time delay of MCPTT (Multi-chip PTT) service - Google Patents

System and method for testing time delay of MCPTT (Multi-chip PTT) service Download PDF

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Publication number
CN112737870B
CN112737870B CN201911039104.2A CN201911039104A CN112737870B CN 112737870 B CN112737870 B CN 112737870B CN 201911039104 A CN201911039104 A CN 201911039104A CN 112737870 B CN112737870 B CN 112737870B
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mcptt
terminal
digital signal
time delay
controller
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CN112737870A (en
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李琳
龚小聪
牛晖萍
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Chengdu TD Tech Ltd
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Chengdu TD Tech Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0852—Delays
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/08—Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
    • H04L43/0823—Errors, e.g. transmission errors
    • H04L43/0847—Transmission error
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/08—Testing, supervising or monitoring using real traffic
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/06—Selective distribution of broadcast services, e.g. multimedia broadcast multicast service [MBMS]; Services to user groups; One-way selective calling services
    • H04W4/10—Push-to-Talk [PTT] or Push-On-Call services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W84/00—Network topologies
    • H04W84/02—Hierarchically pre-organised networks, e.g. paging networks, cellular networks, WLAN [Wireless Local Area Network] or WLL [Wireless Local Loop]
    • H04W84/04—Large scale networks; Deep hierarchical networks
    • H04W84/08—Trunked mobile radio systems

Abstract

The invention provides a time delay test system and a time delay test method for an MCPTT service. The system comprises: the system comprises a first MCPTT terminal, a second MCPTT terminal, a microphone and a controller; the first MCPTT terminal is an MCPTT service calling end, and the second MCPTT terminal is an MCPTT service answering end. The call key of the first MCPTT terminal is electrically connected with the controller, and the first MCPTT terminal is used for transmitting a first analog electric signal generated by a first user operating the call key of the first MCPTT terminal to the controller. The microphone is electrically connected with the controller, and the microphone is used for converting the sound signal of the first MCPTT terminal or the sound signals of the first MCPTT terminal and the second MCPTT terminal into a second analog electric signal and then transmitting the second analog electric signal to the controller. The system improves the accuracy of the delay test of the MCPTT service.

Description

System and method for testing time delay of MCPTT (Multi-chip PTT) service
Technical Field
The invention relates to the field of trunking communication, in particular to a time delay testing system and a time delay testing method for MCPTT (multicast telephony) service.
Background
With the continuous development of trunking communication technology, a Mission Critical Push To Talk (MCPTT) service begins To appear in the visual field of people, the MCPTT aims To provide command and scheduling services such as talkback and the like for the fields of public safety application and the like based on a Long Term Evolution (LTE) network of a telecom operator, has wide application in the fields of government affairs, medical treatment, energy, traffic, emergency communication and the like, and is mainly used for rapid communication among specific group personnel.
In a third Generation Partnership Project (3rd GPP) protocol, a delay indicator of MCPTT service is explicitly defined, and each manufacturer usually performs statistics by logging to test and accept the delay, and obtains the delay indicator by counting a time difference between logs.
However, in the MCPTT service flow, part of the flows, such as key pressing, alert tone playing, etc., cannot be recorded through the log, and in addition, because a timing error usually exists between the calling terminal and the receiving terminal, the result of performing the delay statistics by logging is often inaccurate.
Disclosure of Invention
The invention provides a time delay test system and a time delay test method for MCPTT business, which are used for improving the accuracy of the time delay test of the MCPTT business.
In a first aspect, the present invention provides a delay testing system for MCPTT services, including:
the system comprises a first MCPTT terminal, a second MCPTT terminal, a microphone and a controller; the first MCPTT terminal is an MCPTT service calling end, and the second MCPTT terminal is an MCPTT service answering end;
the call key of the first MCPTT terminal is electrically connected with the controller, and the first MCPTT terminal is used for transmitting a first analog electric signal generated by a first user operating the call key of the first MCPTT terminal to the controller;
the microphone is electrically connected with the controller, and the microphone is used for converting the sound signals of the first MCPTT terminal or the sound signals of the first MCPTT terminal and the second MCPTT terminal into second analog electric signals and then transmitting the second analog electric signals to the controller;
the controller is used for determining the time delay of the MCPTT business according to the first analog electric signal and the second analog electric signal.
Optionally, the controller includes: an analog-to-digital converter and a processor;
the analog-to-digital converter is electrically connected with the processor, the microphone and the call key of the first MCPTT terminal respectively;
the analog-to-digital converter is used for converting the first analog electric signal into a first digital signal and converting the second analog electric signal into a second digital signal;
the processor is used for determining the time delay of the MCPTT business according to the first digital signal and the second digital signal.
Optionally, the processor is specifically configured to determine a first time delay of the MCPTT service according to a starting time of a low level in the first digital signal and a starting time of a first high level in the second digital signal; the first time delay is the time from the first user initiating the MCPTT service request through the first MCPTT terminal to the time when the request authorization prompt tone is received.
Optionally, the processor is specifically configured to determine a second time delay of the MCPTT service according to a starting time of a low level in the first digital signal and a starting time of a third high level in the second digital signal; the second time delay is the time from the first user initiating the MCPTT service request through the first MCPTT terminal to the second user receiving the voice of the first user through the second MCPTT terminal.
Optionally, the processor is specifically configured to determine a third time delay of the MCPTT service according to a starting time of a second high level in the second digital signal and a starting time of a third high level in the second digital signal; the third time delay is the time from the first user sending voice through the first MCPTT terminal to the second user receiving the voice of the first user through the second MCPTT terminal.
In a second aspect, the present invention provides a method for testing the delay of an MCPTT service, which is applied to a system for testing the delay of the MCPTT service, where the system includes: the system comprises a first MCPTT terminal, a second MCPTT terminal, a microphone and a controller; the first MCPTT terminal is an MCPTT service calling end, and the second MCPTT terminal is an MCPTT service answering end; the method comprises the following steps:
the first MCPTT terminal transmits a first analog electric signal generated by a first user operating a call key of the first MCPTT terminal to the controller;
the microphone converts the sound signal of the first MCPTT terminal or the sound signals of the first MCPTT terminal and the second MCPTT terminal into a second analog electric signal and then transmits the second analog electric signal to the controller;
and the controller determines the time delay of the MCPTT business according to the first analog electric signal and the second analog electric signal.
Optionally, the determining, by the controller, the time delay of the MCPTT service according to the first analog electrical signal and the second analog electrical signal includes:
the controller converts the first analog electrical signal into a first digital signal and converts the second analog electrical signal into a second digital signal;
and the controller determines the time delay of the MCPTT business according to the first digital signal and the second digital signal.
Optionally, the determining, by the controller, the time delay of the MCPTT service according to the first digital signal and the second digital signal includes:
the controller determines a first time delay of the MCPTT service according to the starting time of the low level in the first digital signal and the starting time of the first high level in the second digital signal; the first time delay is the time from the first user initiating the MCPTT service request through the first MCPTT terminal to the time when the request authorization prompt tone is received.
Optionally, the determining, by the controller, the time delay of the MCPTT service according to the first digital signal and the second digital signal includes:
the controller determines a second time delay of the MCPTT service according to the starting time of the low level in the first digital signal and the starting time of the third high level in the second digital signal; the second time delay is the time from the first user initiating the MCPTT service request through the first MCPTT terminal to the second user receiving the voice of the first user through the second MCPTT terminal.
Optionally, the determining, by the controller, the time delay of the MCPTT service according to the first digital signal and the second digital signal includes:
the controller determines a third time delay of the MCPTT service according to the starting time of the second high level in the second digital signal and the starting time of the third high level in the second digital signal; the third time delay is the time from the first user sending voice through the first MCPTT terminal to the second user receiving the voice of the first user through the second MCPTT terminal.
The invention provides a time delay test system and a time delay test method for an MCPTT service. Wherein, this system includes: the system comprises a first MCPTT terminal, a second MCPTT terminal, a microphone and a controller; the first MCPTT terminal is an MCPTT service calling end, and the second MCPTT terminal is an MCPTT service answering end. The call key of the first MCPTT terminal is electrically connected with the controller, and the first MCPTT terminal is used for transmitting a first analog electric signal generated by a first user operating the call key of the first MCPTT terminal to the controller. The microphone is electrically connected with the controller, and the microphone is used for converting the sound signal of the first MCPTT terminal or the sound signals of the first MCPTT terminal and the second MCPTT terminal into a second analog electric signal and then transmitting the second analog electric signal to the controller. The controller is used for determining the time delay of the MCPTT business according to the first analog electric signal and the second analog electric signal. The system adopts a hardware circuit to connect a call key of a first MCPTT terminal, takes the loudspeaker voice of the first MCPTT terminal and the loudspeaker voice of a second MCPTT terminal through a microphone, records the key pressing time and the prompt tone from the analog signal, so that the test scene is closer to the real use scene of a user, the time delay of the two paths of analog electric signals is consistent, the time delay error between different terminals is avoided, and the accuracy of the time delay test of the MCPTT service is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic structural diagram i of a delay testing system of MCPTT services according to the present invention;
fig. 2 is a flow chart of MCPTT service according to the present invention;
fig. 3 is a schematic structural diagram of a delay test system of MCPTT services provided in the present invention;
fig. 4 is a schematic structural diagram three of a delay testing system of MCPTT services provided in the present invention;
FIG. 5 is a first signal waveform provided by the present invention;
FIG. 6 is a second signal waveform diagram provided by the present invention;
FIG. 7 is a third signal waveform provided by the present invention;
fig. 8 is a schematic flow chart of a delay testing method for MCPTT services according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the MCPTT service flow, a calling end user presses a calling button of a calling end to indicate that an MCPTT service request is sent, then the calling end receives a prompt tone to remind the calling end user that the calling end user can start speaking, the calling end user starts speaking and sends voice after hearing the prompt tone, and due to the fact that time delay exists between the calling end and an answering end, the answering end user only hears the voice sent by the calling user after certain time delay. The delay index in the MCPTT service flow is clearly defined in the 3GPP protocol, and respectively: the time interval between the calling terminal user pressing the calling key on the calling terminal and receiving the prompt signal for starting to talk; the time interval from the calling end user pressing a calling key on the calling end to the answering end user hearing the first voice; the time interval between when the calling end user utters speech and when the receiving end user hears the speech. The protocol station defines the indexes in the aspect of customer experience, and emphasizes end-to-end verification and mouth-to-ear verification of users.
In order to accurately test the delay index defined in the protocol, the invention provides a delay test system of MCPTT business, comprising: the system comprises a first MCPTT terminal, a second MCPTT terminal, a microphone and a controller; the first MCPTT terminal is an MCPTT service calling end, and the second MCPTT terminal is an MCPTT service answering end. The following describes the delay testing system of MCPTT service provided by the present invention with reference to specific embodiments.
Fig. 1 is a first schematic structural diagram of a time delay testing system of an MCPTT service provided in the present invention. As shown in fig. 1, the system includes: a first MCPTT terminal 10, a second MCPTT terminal 20, a microphone 30, and a controller 40; wherein, the first MCPTT terminal 10 is an MCPTT service calling end, and the second MCPTT terminal 20 is an MCPTT service answering end.
The call button of the first MCPTT terminal 10 is electrically connected to the controller 40, and the first MCPTT terminal 10 is configured to transmit a first analog electrical signal generated by a first user operating the call button of the first MCPTT terminal 10 to the controller 40.
The microphone 30 is electrically connected to the controller 40, and the microphone 30 is used to convert the sound signal of the first MCPTT terminal 10 or the sound signals of the first MCPTT terminal 10 and the second MCPTT terminal 20 into a second analog electrical signal and transmit the second analog electrical signal to the controller 40.
The controller 10 is configured to determine a time delay of the MCPTT service according to the first analog electrical signal and the second analog electrical signal.
In this embodiment, the call key of the first MCPTT terminal 10 is electrically connected to the controller, and when the first user presses the call key of the first MCPTT terminal 10, the controller 40 can obtain the change of the electrical signal generated by the press of the call key, that is, the controller 40 can obtain the time when the call key of the first MCPTT terminal 10 is pressed through the first analog electrical signal.
The microphone 30 may receive a sound signal and convert the received sound signal into an analog electrical signal, specifically, the microphone 30 may receive an alert tone played by a speaker of the first MCPTT terminal 10, where the alert tone is received after the first user presses a call button of the first MCPTT terminal 10 to send an MCPTT service request, and the alert tone is received to prompt the first user to start speaking, and may also receive a voice sent by the first user through the first MCPTT terminal 10 and a voice received by the second MCPTT terminal 20 and played through the speaker, and the microphone 30 may convert the sound signal into a second analog electrical signal and transmit the second analog electrical signal to the controller 40. The controller 40 can obtain the starting time of each sound signal in the MCPTT service flow through the second analog electrical signal.
Accordingly, the controller 40 can obtain, according to the first analog electrical signal and the second analog electrical signal, the time T1 when the call key of the first MCPTT terminal 10 is pressed, the alert tone start time T2 and the alert tone end time T3 of the first MCPTT terminal 10, the start time T4 of the voice uttered by the first user through the first MCPTT terminal 10, and the time T5 when the second MCPTT terminal 20 receives and plays the voice through the speaker, that is, the time T5 when the microphone 30 receives the sound of the second MCPTT terminal 20, according to the actual needs, and can calculate the time delay of the MCPTT service to be tested according to the above times.
The delay test system for the MCPTT service provided in this embodiment includes: the system comprises a first MCPTT terminal, a second MCPTT terminal, a microphone and a controller; the first MCPTT terminal is an MCPTT service calling end, and the second MCPTT terminal is an MCPTT service answering end. The call key of the first MCPTT terminal is electrically connected with the controller, and the first MCPTT terminal is used for transmitting a first analog electric signal generated by a first user operating the call key of the first MCPTT terminal to the controller. The microphone is electrically connected with the controller, and the microphone is used for converting the sound signal of the first MCPTT terminal or the sound signals of the first MCPTT terminal and the second MCPTT terminal into a second analog electric signal and then transmitting the second analog electric signal to the controller. The controller is used for determining the time delay of the MCPTT business according to the first analog electric signal and the second analog electric signal. The system adopts a hardware circuit to connect a call key of a first MCPTT terminal, takes the loudspeaker voice of the first MCPTT terminal and the loudspeaker voice of a second MCPTT terminal through a microphone, records the key pressing time and the prompt tone from the analog signal, so that the test scene is closer to the real use scene of a user, the time delay of the two paths of analog electric signals is consistent, the time delay error between different terminals is avoided, and the accuracy of the time delay test of the MCPTT service is improved.
On the basis of the above embodiment, fig. 3 is a schematic structural diagram of a delay testing system of MCPTT services provided in the present invention. As shown in fig. 3, the controller 40 includes: an analog-to-digital converter 401 and a processor 402.
Analog-to-digital converter 401 is electrically connected to processor 402, microphone 30, and the call button of first MCPTT terminal 10, respectively.
The analog-to-digital converter 401 is used for converting the first analog electrical signal into a first digital signal and converting the second analog electrical signal into a second digital signal.
The processor 402 is configured to determine a time delay of the MCPTT service according to the first digital signal and the second digital signal.
Since both the signal generated by the first user operating the call button of the first MCPTT terminal 10 and the signal converted from the sound signal by the microphone 30 are analog signals, the analog signals need to be converted into digital signals by the analog-to-digital converter 401 for the processor 402 to perform data processing. In practical applications, as shown in fig. 4, the analog-to-digital converter 401 may be a sound card, and the processor 402 may be a central processing unit in a personal computer, which is not particularly limited in this embodiment.
The first digital signal generates a low level when the call key of the first MCPTT terminal 10 is pressed; for the second digital signal converted from the sound signal received by the microphone, the first high level is generated when the first MCPTT terminal 10 plays the alert tone, after the alert tone is over, the second high level is generated when the first user starts to send the voice through the first MCPTT terminal 10, and the third high level is generated when the second MCPTT terminal 20 receives and plays the voice, and the processor 402 can determine the delay of the MCPTT service through the level fluctuation of the first digital signal and the second digital signal. And, the waveforms of the first digital signal and the second digital signal may be displayed through a display device. For example, by a personal computer display screen or by an oscilloscope or the like.
Optionally, the processor 402 is specifically configured to determine a first time delay of the MCPTT service according to a starting time of a low level in the first digital signal and a starting time of a first high level in the second digital signal; the first time delay is the time from when the first user initiates an MCPTT service request through the first MCPTT terminal 10 to when a request authorization prompt tone is received.
Specifically, as shown in fig. 5, the starting time of the low level in the first digital signal is the time T1 when the call key is pressed as shown in fig. 2, and the starting time of the first high level in the second digital signal is the time T2 when the alert tone starts as shown in fig. 2. In practical application, in order to obtain a more accurate first delay, multiple tests may be performed, and an average value of the multiple test results is taken as the first delay of the MCPTT service.
Optionally, the processor 402 is specifically configured to determine a second time delay of the MCPTT service according to a starting time of a low level in the first digital signal and a starting time of a third high level in the second digital signal; the second delay is the time from when the first user initiates an MCPTT service request through the first MCPTT terminal 10 to when the second user receives the first user's voice through the second MCPTT terminal 20.
Specifically, as shown in fig. 6, the starting time of the low level in the first digital signal is the time T1 when the call button is pressed as shown in fig. 2, and the starting time of the third high level in the second digital signal is the time T5 when the second user receives the voice of the first user through the second MCPTT terminal 20 as shown in fig. 2. It is understood that only the second high level and the third high level of the second digital signal in the MCTPP service flow are shown in fig. 5, and are not shown in fig. 5 for the first high level as shown in fig. 4. In practical application, in order to obtain a more accurate second delay, multiple tests may be performed, and an average value of multiple test results is taken as the second delay of the MCPTT service.
Optionally, the processor 402 is specifically configured to determine a third time delay of the MCPTT service according to a starting time of a second high level in the second digital signal and a starting time of a third high level in the second digital signal; the third time delay is the time from when the first user makes a voice through the first MCPTT terminal 10 to when the second user receives the first user's voice through the second MCPTT terminal 20.
Specifically, as shown in fig. 7, the starting time of the second high level in the second digital signal is the time T4 shown in fig. 2 when the first user sends out the voice through the first MCPTT terminal 10, and the starting time of the third high level in the second digital signal is the time T5 shown in fig. 2 when the second user receives the voice of the first user through the second MCPTT terminal 20. It is understood that only the second high level and the third high level of the second digital signal in the MCTPP service flow are shown in fig. 5, and are not shown in fig. 5 for the first high level as shown in fig. 4. In practical applications, in order to obtain a more accurate third delay, multiple tests may be performed, and an average value of the multiple test results is taken as the third delay of the MCPTT service.
In an actual test, in order to avoid the overlapping of the voice sent by the first user through the first MCPTT terminal 10 and the signal played by the second MCPTT terminal 20, a sound source with a shorter time duration may be selected as the voice sent by the first user for the test, and the time duration of the sound source is less than the third delay of the MCPTT service in most cases. For example, as shown in fig. 6, at time T4, the first MCPTT terminal 10 starts to make speech, the high-level end time is the time when the first MCPTT terminal 10 ends to make speech, and at time T5, the second MCPTT terminal 20 plays the speech, that is, the length of the sound source at the time of test is less than the third delay. In addition, in order to further distinguish the sound signals of the first MCPTT terminal 10 and the second MCPTT terminal 20, at the time of actual test, the microphone 30 may be brought closer to the second MCPTT terminal 20 so that the amplitude of the high level corresponding to the voice signal played by the second MCPTT terminal 20 is greater than the amplitude of the high level corresponding to the voice signal emitted by the first MCPTT terminal 10.
Fig. 8 is a schematic flow chart of a delay testing method for MCPTT services according to the present invention. The method is applied to the delay testing system of the MCPTT service in any embodiment, and the system comprises the following steps: the system comprises a first MCPTT terminal, a second MCPTT terminal, a microphone and a controller; the first MCPTT terminal is an MCPTT service calling end, and the second MCPTT terminal is an MCPTT service answering end; the method comprises the following steps:
s801, the first MCPTT terminal transmits a first analog electric signal generated by a first user operating a call key of the first MCPTT terminal to the controller.
And S802, the microphone converts the sound signal of the first MCPTT terminal or the sound signals of the first MCPTT terminal and the second MCPTT terminal into a second analog electric signal and then transmits the second analog electric signal to the controller.
And S803, the controller determines the time delay of the MCPTT service according to the first analog electric signal and the second analog electric signal.
Optionally, the determining, by the controller in S803 according to the first analog electrical signal and the second analog electrical signal, a time delay of the MCPTT service includes:
the controller converts the first analog electrical signal into a first digital signal and converts the second analog electrical signal into a second digital signal;
the controller determines the time delay of the MCPTT service according to the first digital signal and the second digital signal.
Optionally, the determining, by the controller in S803 according to the first digital signal and the second digital signal, the time delay of the MCPTT service includes:
the controller determines a first time delay of the MCPTT service according to the starting time of the low level in the first digital signal and the starting time of the first high level in the second digital signal; the first time delay is the time from the first user initiating the MCPTT service request through the first MCPTT terminal to the receiving of the request authorization prompt tone.
Optionally, the determining, by the controller in S803 according to the first digital signal and the second digital signal, the time delay of the MCPTT service includes:
the controller determines a second time delay of the MCPTT service according to the starting time of the low level in the first digital signal and the starting time of the third high level in the second digital signal; the second time delay is the time from the first user initiating the MCPTT service request through the first MCPTT terminal to the second user receiving the voice of the first user through the second MCPTT terminal.
Optionally, the determining, by the controller in S803 according to the first digital signal and the second digital signal, the time delay of the MCPTT service includes:
the controller determines a third time delay of the MCPTT service according to the starting time of the second high level in the second digital signal and the starting time of the third high level in the second digital signal; the third time delay is the time from the first user sending voice through the first MCPTT terminal to the second user receiving the first user's voice through the second MCPTT terminal.
The implementation principle and technical effect of the method for testing the delay of the MCPTT service provided in this embodiment are similar to those of the above system embodiment, and are not described herein again.
Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.

Claims (10)

1. A time delay test system for a mission-critical voice intercom MCPTT service is characterized by comprising the following steps:
the system comprises a first MCPTT terminal, a second MCPTT terminal, a microphone and a controller; the first MCPTT terminal is an MCPTT service calling end, and the second MCPTT terminal is an MCPTT service answering end;
the call key of the first MCPTT terminal is electrically connected with the controller, and the first MCPTT terminal is used for transmitting a first analog electric signal generated by a first user operating the call key of the first MCPTT terminal to the controller;
the microphone is electrically connected with the controller and is used for converting sound signals of the first MCPTT terminal and the second MCPTT terminal into second analog electric signals and then transmitting the second analog electric signals to the controller;
the controller is used for determining the time delay of the MCPTT business according to the first analog electric signal and the second analog electric signal;
the microphone is electrically connected with the controller, the microphone is used for converting the sound signals of the first MCPTT terminal and the second MCPTT terminal into a second analog electric signal and then transmitting the second analog electric signal to the controller, and the method comprises the following steps:
the microphone receives a prompt tone played by a loudspeaker of the first MCPTT terminal, wherein the prompt tone is received after a first user presses a call key of the first MCPTT terminal to send an MCPTT service request and prompts the first user to start speaking, the microphone also receives voice sent by the first user through the first MCPTT terminal and voice received by the second MCPTT terminal and played through the loudspeaker, and the microphone converts received voice signals into second analog electric signals and transmits the second analog electric signals to the controller.
2. The system of claim 1, wherein the controller comprises: an analog-to-digital converter and a processor;
the analog-to-digital converter is electrically connected with the processor, the microphone and the call key of the first MCPTT terminal respectively;
the analog-to-digital converter is used for converting the first analog electric signal into a first digital signal and converting the second analog electric signal into a second digital signal;
the processor is used for determining the time delay of the MCPTT business according to the first digital signal and the second digital signal.
3. The system of claim 2,
the processor is specifically configured to determine a first time delay of the MCPTT service according to a starting time of a low level in the first digital signal and a starting time of a first high level in the second digital signal; the first time delay is the time from the first user initiating the MCPTT service request through the first MCPTT terminal to the time when the request authorization prompt tone is received.
4. The system of claim 2,
the processor is specifically configured to determine a second time delay of the MCPTT service according to a starting time of a low level in the first digital signal and a starting time of a third high level in the second digital signal; the second time delay is the time from the first user initiating the MCPTT service request through the first MCPTT terminal to the second user receiving the voice of the first user through the second MCPTT terminal.
5. The system of claim 2,
the processor is specifically configured to determine a third time delay of the MCPTT service according to a starting time of a second high level in the second digital signal and a starting time of a third high level in the second digital signal; the third time delay is the time from the first user sending voice through the first MCPTT terminal to the second user receiving the voice of the first user through the second MCPTT terminal.
6. A time delay test method of a key task voice talkback MCPTT business is characterized in that the time delay test method is applied to a time delay test system of the MCPTT business, and the system comprises the following steps: the system comprises a first MCPTT terminal, a second MCPTT terminal, a microphone and a controller; the first MCPTT terminal is an MCPTT service calling end, and the second MCPTT terminal is an MCPTT service answering end; the method comprises the following steps:
the first MCPTT terminal transmits a first analog electric signal generated by a first user operating a call key of the first MCPTT terminal to the controller;
the microphone converts sound signals of the first MCPTT terminal and the second MCPTT terminal into a second analog electric signal and then transmits the second analog electric signal to the controller;
the controller determines the time delay of the MCPTT business according to the first analog electric signal and the second analog electric signal;
the microphone converts the sound signals of the first MCPTT terminal and the second MCPTT terminal into a second analog electric signal and then transmits the second analog electric signal to the controller, and the method comprises the following steps:
the microphone receives a prompt tone played by a loudspeaker of the first MCPTT terminal, wherein the prompt tone is received after a first user presses a call key of the first MCPTT terminal to send an MCPTT service request and prompts the first user to start speaking, the microphone also receives voice sent by the first user through the first MCPTT terminal and voice received by the second MCPTT terminal and played through the loudspeaker, and the microphone converts received voice signals into second analog electric signals and transmits the second analog electric signals to the controller.
7. The method of claim 6, wherein the controller determines the time delay of the MCPTT service according to the first analog electrical signal and the second analog electrical signal, comprising:
the controller converts the first analog electrical signal into a first digital signal and converts the second analog electrical signal into a second digital signal;
and the controller determines the time delay of the MCPTT business according to the first digital signal and the second digital signal.
8. The method of claim 7, wherein the controller determines the time delay of the MCPTT service according to the first digital signal and the second digital signal, and wherein the determining the time delay of the MCPTT service comprises:
the controller determines a first time delay of the MCPTT service according to the starting time of the low level in the first digital signal and the starting time of the first high level in the second digital signal; the first time delay is the time from the first user initiating the MCPTT service request through the first MCPTT terminal to the time when the request authorization prompt tone is received.
9. The method of claim 7, wherein the controller determines the time delay of the MCPTT service according to the first digital signal and the second digital signal, and comprises:
the controller determines a second time delay of the MCPTT business according to the starting time of the low level in the first digital signal and the starting time of the third high level in the second digital signal; the second time delay is the time from the first user initiating the MCPTT service request through the first MCPTT terminal to the second user receiving the voice of the first user through the second MCPTT terminal.
10. The method of claim 7, wherein the controller determines the time delay of the MCPTT service according to the first digital signal and the second digital signal, and wherein the determining the time delay of the MCPTT service comprises:
the controller determines a third time delay of the MCPTT service according to the starting time of the second high level in the second digital signal and the starting time of the third high level in the second digital signal; the third time delay is the time from the first user sending voice through the first MCPTT terminal to the second user receiving the voice of the first user through the second MCPTT terminal.
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