CN103532821B - A kind of MSN audio transmission delay contrast test method and apparatus - Google Patents
A kind of MSN audio transmission delay contrast test method and apparatus Download PDFInfo
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- CN103532821B CN103532821B CN201210224372.3A CN201210224372A CN103532821B CN 103532821 B CN103532821 B CN 103532821B CN 201210224372 A CN201210224372 A CN 201210224372A CN 103532821 B CN103532821 B CN 103532821B
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Abstract
The present invention discloses a kind of MSN audio transmission delay contrast test method and apparatus, the process of contrast test is carried out using at least 2 groups of test terminal-pair difference MSN audio transmission delays applied to test equipment, every group of test terminal includes the first terminal and second terminal of the identical MSN of application, the MSN that the MSN that at least one set test terminal is applied is applied with other groups of test terminals differs, and this method includes：Test equipment sends audio signal to first terminal simultaneously, and record sends the time, and receives the audio signal of second terminal return, and corresponding each group test terminal record receives the time；The audio signal received is first terminal passes through the second terminal that applied MSN is sent to this group by the audio signal received, then is sent to test equipment by it；Test equipment obtains the contrast test result of each MSN audio transmission delay according to the reception time for sending time and each group.
Description
Technical field
The present invention relates to communication technical field, more particularly to a kind of MSN audio transmission delay contrast test
Method and apparatus.
Background technology
Instant messaging (Instant Messenger, IM) is the industry for referring to send and receive internet message etc. immediately
Business, instant messaging is no longer a simple chat tool, and it has developed into collection exchange, information, amusement, search, electronics business
The synthesization information platform that business, office cooperation and corporate client service etc. are integrated.
With the fast development of Internet technology, instant communication software role in daily life is also got over
Come more important.Thus, various MSNs emerge in an endless stream, and audio transmission delay is that a MSN of evaluation is good and bad
An important indicator, therefore, how to carry out MSN audio transmission delay contrast test, it has also become important research
Problem.
The scheme of existing test MSN transmission streamed audio transmission delay, is typically sent by transmitting terminal
Audio signal simultaneously starts timing, in receiving terminal by the stopwatch manually recorded time for receiving audio signal, obtains audio transmission
The test parameter of delay.It is if necessary to judge the performance of each MSN audio transmission, then right respectively according to the above method
Each MSN is tested, and obtains the test parameter of each MSN audio transmission delay successively, then to test
As a result it is analyzed, draws evaluation result.
Existing MSN audio transmission delay test is asynchronous, can not ensure network condition during each test
It is completely the same, particularly under 3G wireless channel conditions, influence of the network communication situation to test result can not be avoided, is caused pair
It is more inaccurate than test result, and cost of labor is high, error is larger.
Therefore, a kind of MSN audio transmission delay contrast test scheme is needed badly to solve the above problems.
The content of the invention
It is an object of the invention to provide a kind of MSN audio transmission delay contrast test method and apparatus, use
To solve the problems, such as contrast test result inaccuracy, the accuracy of contrast test is realized.
Therefore, the embodiment of the present invention adopts the following technical scheme that：
The embodiment of the present invention provides a kind of MSN audio transmission delay contrast test method, is set applied to test
The standby process that contrast test is carried out using at least 2 groups of test terminal-pair difference MSN audio transmission delays, every group of survey
Examination terminal includes being applied using the first terminal and second terminal of identical MSN, at least one group of test terminal
The MSN applied with other groups of test terminals of MSN differ, methods described includes：
Test equipment sends audio signal to the first terminal that each group is tested in terminal simultaneously, and records and send the time；
The test equipment receives the audio signal that the second terminal in each group test terminal returns, and corresponding each group test
Terminal record receives the time；Wherein, the audio signal that the second terminal in every group of test terminal returns is in group test terminal
First terminal receive the audio signal that the test equipment is sent after, pass through applied MSN and be sent to this
The second terminal of group, then the test equipment is sent to by the second terminal of this group；
The test equipment receives the time according to corresponding to the transmission time and each group test terminal, obtains each IMU
Interrogate the contrast test result of software audio transmission delay.
The embodiment of the present invention also provides a kind of test equipment, and at least 2 groups of test terminal-pairs are utilized not applied to test equipment
It is delayed with MSN audio transmission and carries out the process of contrast test, every group of test terminal is included using identical IMU
The first terminal and second terminal of software are interrogated, the MSN that at least one group of test terminal is applied and other groups of tests
The MSN that terminal is applied differs, and the test equipment includes：Processing module, sending module, receiving module with
And analysis module；
The processing module, for sending control instruction to the sending module, and record and send the time；And described
When receiving module receives the audio signal that the second terminal in each group test terminal returns, corresponding each group test terminal record connects
Between time receiving；
The sending module, for being tested after the control instruction that the processing module is sent is received, while to each group
First terminal in terminal sends audio signal；
The receiving module, the audio signal returned for receiving the second terminal in each group test terminal；Wherein, every group
The audio signal that second terminal in test terminal returns is that the first terminal in group test terminal receives the transmission mould
After the audio signal that block is sent, pass through the second terminal that applied MSN is sent to this group, then the by this group
Two terminals are sent to this equipment；
The analysis module, for being connect corresponding to the transmission time recorded according to the processing module and each group test terminal
Between time receiving, the contrast test result of each MSN audio transmission delay is obtained.
Compared with prior art, embodiments of the invention have the following advantages that：
The embodiment of the present invention sends audio signal to the first terminal that each group is tested in terminal simultaneously by test equipment, and
Record sends the time, and each group test terminal passes through the transmission that applied MSN carries out audio signal, and by testing
Equipment receives the audio signal that the second terminal in each group test terminal returns, and corresponding each group test terminal record receives the time,
The time is received according to corresponding to sending time and each group test terminal, obtains the contrast of each MSN audio transmission delay
Test result, each group test terminal are synchronously tested under the conditions of identical network communication, have ensured contrast test result
Accuracy, in addition, being tested by test equipment, not only avoid error existing for manual testing, also reduce manually into
This.
Brief description of the drawings
Fig. 1 is MSN audio transmission provided in an embodiment of the present invention delay contrast test configuration diagram；
Fig. 2 is MSN audio transmission provided in an embodiment of the present invention delay contrast test schematic flow sheet；
Fig. 3 is the waveform signal of MSN audio transmission provided in an embodiment of the present invention delay contrast test result
Figure；
Fig. 4 is test equipment structural representation provided in an embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the present invention, clear, complete description is carried out to the technical scheme in the present invention, is shown
So, described embodiment is the part of the embodiment of the present invention, rather than whole embodiments.Based on the implementation in the present invention
Example, the every other embodiment that those of ordinary skill in the art are obtained on the premise of creative work is not made, all belongs to
In the scope of protection of the invention.
MSN audio transmission delay contrast test method provided in an embodiment of the present invention, applied to test equipment
The process of contrast test, every group of test are carried out using at least 2 groups of test terminal-pair difference MSN audio transmission delays
Terminal includes being applied using the first terminal and second terminal of identical MSN, at least one group of test terminal
MSN differs with instant 2 bitcom that other groups of test terminals are applied.
The group number for testing terminal can be identical with tested MSN number of species, what every group of test terminal was applied
The MSN that MSN is applied with other groups of test terminals is different from, below using 2 groups of test terminals as
Example, illustrate MSN audio transmission delay contrast test flow.As shown in figure 1, it is to be provided in an embodiment of the present invention
When bitcom audio transmission delay contrast test configuration diagram.In the present embodiment, test equipment 10 is to 2 groups of test terminals
（First group of test terminal 20 and second group of test terminal 30）The different MSNs of application（First MSN
With the second MSN）Carry out audio transmission delay contrast test.First group of test terminal 20 includes terminal 21 and terminal
22, the first MSN is installed in terminal 21 and terminal 22, terminal 21 and terminal 22 can pass through the first instant messaging
Software transmission audio signal；Second, which rents test terminal 30, includes terminal 31 and terminal 32, and the is provided with terminal 31 and terminal 32
Two MSNs, terminal 31 and terminal 32 can transmit audio signal by the second MSN.Terminal 21 and end
End 31 is first terminal, and terminal 22 and terminal 32 are second terminal.Test equipment 10 is used for simultaneously to first group of test terminal 20
With the first terminal in second group of test terminal 30（Terminal 21 and terminal 31）Audio signal is sent, for terminal 21 and terminal 31
The audio signal is received, and audio transmission is carried out in this group, and receives first group of test terminal 20 and second group of test end
Second terminal in end 30（Terminal 22 and terminal 32）The audio signal of return, show that two MSN audio transmissions prolong
When contrast test result.
Below by taking the framework shown in Fig. 1 as an example, describe the delay contrast of MSN audio transmission in detail with reference to Fig. 2 and survey
Flow is tried, in the embodiment of the present invention, test equipment 10 is from the PC with microphone and loudspeaker（PC）, and install
There is audio to play and record software, terminal 21 and terminal 31 have microphone, and terminal 22 and terminal 32 have loudspeaker, as schemed institute
Show, the flow includes：
Step 201, test equipment 10 sends audio signal to the first terminal that each group is tested in terminal simultaneously, and records hair
Send the time.
Specifically, test equipment 10 after the instruction for starting test is received, plays one section of unifrequency audio, and record and broadcast
The time is put, when test equipment 10 is playing audio, the recording software run in test equipment 10 just starts timing.In order to reach
Preferably test effect, the frequency of audio signal can be（20Hz~4000Hz）, it is preferred that can be using selected frequency as 800Hz's
Audio signal.In order to ensure test accuracy, when a length of 50ms of the audio signal, avoid audio duration it is long caused by return
The audio signal returned is overlapping with the audio signal of transmission, the problem of causing test result inaccuracy.Test equipment 10 is by raising one's voice
Device broadcasts the audio signal, due between test equipment 10 and first group of test terminal 20 and second group of test terminal 30 distance compared with
Closely（Usually more than ten meters of distance）, it is believed that terminal 21 and terminal 31 receive the audio signal simultaneously.
Step 202, after the first terminal in each group test terminal receives audio signal, applied instant messaging is passed through
Software is sent to the second terminal of this group.
Specifically, after the terminal 21 in first group of test terminal 20 receives audio signal, it is soft by the first instant messaging
Part is sent to terminal 22；It is soft by the second instant messaging after terminal 31 in second group of test terminal 30 receives audio signal
Part is sent to terminal 32.
Preferably, terminal 21 and terminal 31 receive audio signal by microphone.
It can pass through between first group of test terminal 20 and first terminal in second group of test terminal 30 and second terminal
Cable network or cordless communication network are communicated, for example, internet, WIFI, 3G etc., realize transmission communication.
Step 203, when the second terminal of each group test terminal receives audio signal, the audio is sent to test equipment 10
Signal.
Specifically, when the terminal 22 in first group of test terminal 20 receives audio signal by the first MSN
When, send the audio signal to test equipment 10；When the terminal 32 in second group of test terminal 30 is soft by the second instant messaging
When part receives audio signal, the audio signal is sent to test equipment 10.
Preferably, terminal 22 and terminal 32 send audio signal by loudspeaker.
In order to distinguish the audio signal that 2 groups of test terminals are sent, terminal 22 and terminal 32 can be broadcasted to the volume of audio
It is arranged to different, for example, the volume of the loudspeaker of terminal 22 can be set to be more than the volume of the loudspeaker of terminal 32.
Step 204, test equipment 10 receives the audio signal that the second terminal in each group test terminal returns, and corresponding each
Group test terminal record receives the time.
Specifically, test equipment 10 distinguishes the audio signal that receiving terminal 22 and terminal 32 are sent, it is preferred that test equipment
10 audio signals that can be sent by microphone receiving terminal 22 and terminal 32.Test equipment 10 can be recorded by recording software
Make the audio, and the reception time for the time scale record each group test terminal reception audio signal for passing through recording software.
Step 205, the amplitude for the audio signal that the second terminal that test equipment 10 is tested in terminal according to each group returns,
Determine to send the group where the second terminal of the audio signal.
Specifically, test equipment 10 is analyzed the audio of recording, the audio signal that is sent due to 2 groups of test terminals
Volume is different, therefore, test group corresponding to audio signal is can determine that by the amplitude for comparing recorded audio.
In test equipment 10 recording software record audio volume control as shown in figure 3,2.15ms receive an amplitude compared with
Small audio signal, a larger audio signal of amplitude is received in 4.18ms, due to setting in first group of test terminal 20
The volume of the loudspeaker of terminal 22 is more than the volume of the loudspeaker of terminal 32 in second group of test terminal 30, therefore, from shown in Fig. 3
Audio volume control figure on can learn that amplitude less audio signal sends for terminal 32, as first group of test terminal 20
Test result, what the larger audio signal of amplitude sent for terminal 22, the test result of as second group test terminal 30.
Step 206, test equipment 10 receives the time according to corresponding to sending time and each group test terminal, calculates each group
The audio transmission delay of MSN, and obtain the contrast test result of each MSN audio transmission delay.
Specifically, test equipment 10 is according to the test group determined in step 205, and recording software record transmission when
Between and receive the time, calculate respectively each test group MSN audio transmission delay.
The gap of different MSN audio transmissions delays can be accurately tested out by the above method, so as to draw
The contrast test result of each MSN audio transmission performance.
In another embodiment of the invention, in test equipment 10 and first terminal（Terminal 21,31）Between, and test
Equipment 10 and second terminal（Terminal 22,32）Between can also pass through wired connection（For example, pass through tone frequency channel wire）Transmit audio letter
Number.
Because the test equipment 10 in the embodiment of the present invention and each group test the closer to the distance of terminal, no matter pass through tone frequency channel wire
Or transmission audio signal is coordinated by loudspeaker and microphone, it can think first terminal in each group test terminal simultaneously
The audio signal of the transmission of test equipment 10 is received, ensure that the accuracy of MSN audio transmission test.
In addition to the different MSN of foregoing each group test terminal applies, another embodiment of the present invention
In, can have that multigroup MSN for being applied of test terminal is identical, and applied with other group test terminals instant
Bitcom is different.Below using using 3 groups of test terminal-pairs, 2 kinds of MSN audio transmissions delays carry out contrast tests as
Example, is described in detail.
The first tested software is installed in one group of test terminal wherein, it is tested that second is installed in remaining two groups of test terminal
Software（That is, two groups of test terminal installation tested softwares of identical second）.Carry out the delay contrast of MSN audio transmission
The flow of test is as it was previously stated, will not be repeated here.In the present embodiment, two groups of test terminal tests obtain two second it is tested
The test result of software（Two reception times）, test equipment receives the times to this two and averages, and it is second tested to obtain this
The reception time of software, and according to the transmission time（The transmission time of first and second tested software is identical）, second tested software connects
Between time receiving and the first tested software the reception time, obtain the contrast test knot of two MSN audio transmissions delay
Fruit.
MSN audio transmission delay contrast test method provided in an embodiment of the present invention, can be used for competing product pair
Than test（The audio transmission delay test of different MSNs）, or the MSN contrast for different editions
Test（The audio transmission delay test of the front and rear different editions of same MSN optimization）.
The embodiment of the present invention sends audio signal to the first terminal that each group is tested in terminal simultaneously by test equipment, and
Record sends the time, and each group test terminal passes through the transmission that applied MSN carries out audio signal, and by testing
Equipment receives the audio signal that the second terminal in each group test terminal returns, and corresponding each group test terminal record receives the time,
The time is received according to corresponding to sending time and each group test terminal, obtains the contrast of each MSN audio transmission delay
Test result, each group test terminal are synchronously tested under the conditions of identical network communication, have ensured contrast test result
Accuracy, in addition, being tested by test equipment, not only avoid error existing for manual testing, also reduce manually into
This.
Conceived based on identical, the embodiment of the present invention also provides a kind of test equipment, as shown in figure 4, the test equipment should
The mistake of contrast test is carried out using at least 2 groups of test terminal-pair difference MSN audio transmission delays for test equipment
Journey, every group of test terminal include the first terminal and second terminal using identical MSN, at least one group of test
The MSN that the MSN that terminal is applied is applied with other groups of test terminals differs, the test equipment
Including：Processing module 41, sending module 42, receiving module 43 and analysis module 44；
Processing module 41, for sending control instruction to sending module 42, and record and send the time；And in receiving module
43 when receiving the audio signal that the second terminal in each group test terminal returns, when corresponding each group test terminal record receives
Between；
Sending module 42, for testing terminal after the control instruction of the transmission of processing module 41 is received, while to each group
In first terminal send audio signal；
Receiving module 43, the audio signal returned for receiving the second terminal in each group test terminal；Wherein, every group of survey
The audio signal that second terminal in examination terminal returns is that the first terminal in group test terminal receives sending module 42 and sent out
After the audio signal sent, pass through the second terminal that applied MSN is sent to this group, then the second end by this group
End is sent to this equipment；
Analysis module 44, for the transmission time recorded according to processing module 41 and each group test terminal corresponding to receive when
Between, obtain the contrast test result of each MSN audio transmission delay.
The volume for the audio signal that second terminal in each group test terminal returns is different, and the test equipment also includes test
Group determining module 45, the audio signal that the second terminal that each group for being received according to receiving module 43 is tested in terminal returns
Amplitude, determine corresponding to test terminal where group.
Analysis module 44, specifically for when there is MSN that two groups of test terminals are applied identical, to application
The reception time averages corresponding to two groups of test terminals of identical MSN, obtains connecing for the MSN
Between time receiving, and combine and send the time and except this is using other each groups in addition to two groups of test terminals of identical MSN
Test and the time is received corresponding to terminal, obtain the contrast test result of each MSN audio transmission delay.
Sending module 42 is loudspeaker；Receiving module 43 is microphone.
It will be appreciated by those skilled in the art that the module in device in embodiment can describe be divided according to embodiment
It is distributed in the device of embodiment, respective change can also be carried out and be disposed other than in one or more devices of the present embodiment.On
The module for stating embodiment can be merged into a module, can also be further split into multiple submodule.
Through the above description of the embodiments, those skilled in the art can be understood that the present invention can be by
Software adds the mode of required general hardware platform to realize, naturally it is also possible to which by hardware, but the former is more in many cases
Good embodiment.Based on such understanding, what technical scheme substantially contributed to prior art in other words
Part can be embodied in the form of software product, and the computer software product is stored in a storage medium, if including
It is dry to instruct to cause a station terminal equipment（Can be mobile phone, personal computer, server, or network equipment etc.）Perform sheet
Invent the method described in each embodiment.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
Depending on protection scope of the present invention.
Claims (9)
- A kind of contrast test method 1. MSN audio transmission is delayed, it is characterised in that utilized applied to test equipment At least 2 groups of test terminal-pair difference MSN audio transmission delays carry out the process of contrast test, every group of test terminal Include being applied instant using the first terminal and second terminal of identical MSN, at least one group of test terminal The MSN that bitcom is applied with other groups of test terminals differs, and methods described includes：Test equipment sends audio signal to the first terminal that each group is tested in terminal simultaneously, and records and send the time；The test equipment receives the audio signal that the second terminal in each group test terminal returns, and corresponding each group test terminal The test equipment record receives the time；Wherein, the audio signal that the second terminal in every group of test terminal returns is that the group is surveyed After first terminal in examination terminal receives the audio signal that the test equipment is sent, pass through applied MSN The second terminal of this group is sent to, then the test equipment is sent to by the second terminal of this group；The test equipment receives the time according to corresponding to the transmission time and each group test terminal, and it is soft to obtain each instant messaging The contrast test result of part audio transmission delay.
- 2. method of testing as claimed in claim 1, it is characterised in that what the second terminal in each group test terminal returned The volume of audio signal is different, and the test equipment receives the time according to corresponding to the transmission time and each group test terminal, Before obtaining the contrast test result of the MSN audio transmission delay of each group test terminal applies, in addition to：The amplitude for the audio signal that the second terminal that the test equipment is tested in terminal according to each group returns, is determined pair Group where the test terminal answered.
- 3. method of testing as claimed in claim 1, it is characterised in that if the instant messaging for having two groups of test terminals to be applied is soft Part is identical, then the test equipment receives the time according to corresponding to the transmission time and each group test terminal, obtains each instant The contrast test result of bitcom audio transmission delay, it is specially：The test equipment is averaged to receiving the time corresponding to two groups of test terminals of the identical MSN of application, is obtained To the reception time of the MSN, and with reference to the transmission time and except the identical MSN of the application Two groups of test terminals outside other each groups test terminal corresponding to receive the time, obtain each MSN audio transmission The contrast test result of delay.
- 4. method of testing as claimed in claim 1, it is characterised in that the test equipment is tested eventually by loudspeaker to each group First terminal in end sends audio signal；The test equipment receives the audio signal for the second terminal return that each group is tested in terminal by microphone.
- 5. method of testing as claimed in claim 1, it is characterised in that test the group number of terminal and tested MSN kind Class quantity is identical, and the MSN that every group of test terminal is applied and the instant messaging that other groups of test terminals are applied are soft Part is different from.
- 6. a kind of test equipment, it is characterised in that utilize at least 2 groups of test terminal-pair difference instant messagings applied to test equipment Software audio transmission delay carries out the process of contrast test, and every group of test terminal includes the of the identical MSN of application One terminal and second terminal, the MSN that at least one group of test terminal is applied are applied with other groups of test terminals MSN differ, the test equipment includes：Processing module, sending module, receiving module and analysis module；The processing module, for sending control instruction to the sending module, and record and send the time；And in the reception When module receives the audio signal that the second terminal in each group test terminal returns, when corresponding each group test terminal record receives Between；The sending module, for testing terminal after the control instruction that the processing module is sent is received, while to each group In first terminal send audio signal；The receiving module, the audio signal returned for receiving the second terminal in each group test terminal；Wherein, every group of test The audio signal that second terminal in terminal returns is that the first terminal in group test terminal receives the sending module hair After the audio signal sent, pass through the second terminal that applied MSN is sent to this group, then the second end by this group End is sent to this equipment；The analysis module, for the transmission time recorded according to the processing module and each group test terminal corresponding to receive when Between, obtain the contrast test result of each MSN audio transmission delay.
- 7. test equipment as claimed in claim 6, it is characterised in that what the second terminal in each group test terminal returned The volume of audio signal is different, and the test equipment also includes：Test group determining module, for being received according to the receiving module To each group test terminal in second terminal return audio signal amplitude, determine corresponding to test terminal where Group.
- 8. test equipment as claimed in claim 6, it is characterised in that the then analysis module, have two groups of surveys specifically for working as When the MSN that examination terminal is applied is identical, to being connect corresponding to two groups of test terminals of the identical MSN of application Averaged between time receiving, obtain the reception time of the MSN, and answer with reference to the transmission time and except described The time is received corresponding to other each groups test terminal outside two groups of test terminals of identical MSN, is respectively When the delay of bitcom audio transmission contrast test result.
- 9. test equipment as claimed in claim 6, it is characterised in that the sending module is loudspeaker；The receiving module For microphone.
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| CN105472190A (en) * | 2015-11-13 | 2016-04-06 | 公安部第三研究所 | Audio signal time delay testing method |
| CN106528435A (en) * | 2016-12-26 | 2017-03-22 | 上海摩软通讯技术有限公司 | Method and system for testing compatibility of mobile terminal and instant messaging software |
| CN108270622A (en) * | 2018-01-22 | 2018-07-10 | 杭州当虹科技有限公司 | A kind of method and system that concurrent emulation testing is carried out to video communication service system |
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| CN1747502A (en) * | 2004-09-09 | 2006-03-15 | 华为技术有限公司 | Tester and test for end to end speech time delay |
| CN102325059A (en) * | 2011-09-09 | 2012-01-18 | 华南理工大学 | Audio frequency end-to-end time delay measurement method of non-intrusive single end acquisition and apparatus thereof |
| CN102497578A (en) * | 2011-11-25 | 2012-06-13 | 武汉大学 | Mobile audio and video real-time communication method in 3G network environment |
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| US7305438B2 (en) * | 2003-12-09 | 2007-12-04 | International Business Machines Corporation | Method and system for voice on demand private message chat |
| US8094556B2 (en) * | 2009-04-27 | 2012-01-10 | Avaya Inc. | Dynamic buffering and synchronization of related media streams in packet networks |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1747502A (en) * | 2004-09-09 | 2006-03-15 | 华为技术有限公司 | Tester and test for end to end speech time delay |
| CN102325059A (en) * | 2011-09-09 | 2012-01-18 | 华南理工大学 | Audio frequency end-to-end time delay measurement method of non-intrusive single end acquisition and apparatus thereof |
| CN102497578A (en) * | 2011-11-25 | 2012-06-13 | 武汉大学 | Mobile audio and video real-time communication method in 3G network environment |
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