CN102025963A - Method and device for controlling call of video telephone - Google Patents
Method and device for controlling call of video telephone Download PDFInfo
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Abstract
The invention discloses a method and a device for controlling a call of a video telephone, which relates to the technology of controlling the video telephone. In the method, an original 64kbps bottom-layer transmission channel for transmitting the video telephone is kept when the channel is deteriorated, and voice data protected by redundancy coding and a control signaling are protected on the relatively wide transmission channel which has a certain bit error rate; redundancy protection is performed on the voice data, so that the transmission quality is relatively high; therefore, relatively higher voice quality can be guaranteed. Simultaneously, after a wireless environment is restored, video call is automatically recovered, and the fluency and experience quality of the call between users are improved.
Description
Technical field
The present invention relates to a kind of visual telephone control technology, relate in particular to a kind of video telephony call control method and device thereof.
Background technology
Growing along with computer network, based on network multimedia transmission is more and more universal, and people increase day by day to the requirement of multimedia communication content, people no longer are satisfied with single, passive traditional media entertainment way, and real needs is personalized, interactive broadband streaming media amusement, particularly along with the further developing of mobile communication network technology, mobile multimedia has shown more and more that its future extensively and get over ripe user's cognition and acceptance.
Mobile multimedia is to provide colourful multimedia application service in mobile communication and stream field, broadband, and this is a mobile value-added service that provides on the basis of mobile communication.Mobile multi-media service has become one of important actuating force of 3G construction and development as an important service of 3G mobile radio communication.Mobile multimedia mainly comprises conversation class (client-client), video stream class (Client-Server) multimedia service.Wherein, third generation partner program (3rd Generation Partnership Project is called for short " 3GPP ") R99 version and later release have just defined the visual telephone business based on circuit commutative field 3G 324M.
In the prior art, after visual telephone was connected, owing to be subjected to the influence of external electromagnetic environmental interference, especially in moving process, there was very big fluctuation in received signal quality, and corresponding decline can appear in propagation channel quality, and the error rate of channel is higher.For video quality is monitored, in the prior art by 324 video telephony protocols stacks when receiving the voice and video data, carry out Bit Error Code Statistics respectively.After 324 video telephony protocols stacks find that the error rate surpasses corresponding thresholding, visual telephone can't keep.The main method of using is at present directly hung up visual telephone or video rollback as terminal.
The main process of video rollback is as follows: terminal is redistributed the Radio Resource that only is used for transmitting normal speech to network transmission Modify message and network negotiate.If network support video rollback function is then replied Modify complete message to terminal, the visual telephone rollback is the normal speech phone; If network does not support video rollback function to reply Modify reject message to terminal, terminal can only be hung up visual telephone after receiving Modify reject message.
Yet the present inventor finds, only detects the voice and video error rate by 324 video telephony protocols stacks, and voice and all very poor situation of image in a period of time can appear in understanding bottom transmission quality situation that can not be in time correct.And, when the bottom transmission quality can't satisfy the video transmission requirement, directly hang up visual telephone and give user's impression bad.Also there is more drawback in the video rollback, and when the video rollback, because the bottom transmission quality is relatively poor at this moment, the error rate is higher, the quality of common voice is also relatively poor relatively; Because upper strata 324 video telephony protocols stacks can't be known the bottom propagation channel quality, after the bottom transmission quality recovered to satisfy video transmission again, visual telephone also can't recover automatically in addition, made a call once more after needing the user to hang up the telephone, and is very inconvenient.
Summary of the invention
First technical problem that the present invention solves provides a kind of video telephony call control method and device thereof, make when the radio signal quality variation, visual telephone can not hung up, can transfer voice call to from video calling automatically, and after radio signal quality is recovered, recover video calling automatically.
Second technical problem that the present invention solves provides a kind of video telephony call control method and device thereof, makes when the radio signal quality variation, can transfer voice call to from video calling automatically, and voice call quality is protected.
In order to solve the problems of the technologies described above, the invention provides a kind of video telephony call control method, comprise following steps:
In video call process, regularly detect bottom video transmission channel transmission quality;
Do not satisfy the video transmission condition if detect described channel transmission quality, then stop transmitting video data, only by this bottom video transmission channel transmitting audio data and control signaling;
Again satisfy the video transmission condition if detect described channel transmission quality, then restart to transmit described video data by this bottom video transmission channel.
As to improvement of the technical scheme, in described only step, described speech data is carried out the redundancy encoding protection by bottom video transmission channel transmitting audio data and control signaling.
As to improvement of the technical scheme, described redundancy encoding protection can for: use the voice coding modes of little compressible that described speech data is encoded.
As to improvement of the technical scheme, the voice coding modes of described little compressible comprises at least: the pulse code modulation PCMU of 64Kbps G.711U, the perhaps pulse code modulation PCMA of 64Kbps G.711A, the perhaps adaptive difference pulse code of 32Kbp modulation.
As to improvement of the technical scheme, described redundancy encoding protection can for: on the basis of original speech coding, original vocoded data is carried out error correction coding once more.
As to improvement of the technical scheme, described timing detect bottom video transmission channel transmission quality mode can for: between 3G higher-layer protocols and 3G 324 protocol stacks, increase a channel quality Indication message, described 3G higher-layer protocols regularly by described channel quality Indication message, reports bottom video transmission channel transmission quality to described 3G 324 protocol stacks.
As to improvement of the technical scheme, described bottom video transmission channel transmission quality criterion comprises the Block Error Rate of this bottom video transmission channel at least;
During greater than first thresholding, described channel transmission quality does not satisfy described video transmission condition at the Block Error Rate of described bottom video transmission channel;
During less than second thresholding, described channel transmission quality satisfies described video transmission condition at the Block Error Rate of described bottom video transmission channel.
The present invention also provides a kind of video telephony call control device, comprises:
Detection module is used at video call process, regularly detects bottom video transmission channel transmission quality;
Transport module is used for by described bottom video transmission channel transmitting video data, speech data and control signaling;
Judge module, be used to judge that described detection module detects channel transmission quality and whether satisfies the video transmission condition, if do not satisfy, then indicate described transport module to stop transmitting video data, only by described bottom video transmission channel transmitting audio data and control signaling; When described detection module detects described channel transmission quality and satisfies described video transmission condition again, indicate described transport module to restart to transmit described video data by this bottom video transmission channel.
As to improvement of the technical scheme, this device can also comprise:
Coding module is used for described speech data is carried out the redundancy encoding protection;
Described judge module also is used for indicating described coding module that described speech data is carried out the redundancy encoding protection when judging that described detection module detects channel transmission quality and do not satisfy the video transmission condition;
Described transport module transmits speech data after the protection of described redundancy encoding by described bottom video transmission channel.
As to improvement of the technical scheme, described coding module can carry out the redundancy encoding protection to described speech data in the following way: use the voice coding modes of little compressible that described speech data is encoded.
As to improvement of the technical scheme, the voice coding modes of described little compressible comprises at least: the pulse code modulation PCMU of 64Kbps G.711U, the perhaps pulse code modulation PCMA of 64Kbps G.711A, the perhaps adaptive difference pulse code of 32Kbp modulation.
As to improvement of the technical scheme, described coding module can carry out the redundancy encoding protection to described speech data in the following way:
On the basis of original speech coding, original vocoded data is carried out error correction coding once more.
As to improvement of the technical scheme, described bottom video transmission channel transmission quality criterion comprises the Block Error Rate of this bottom video transmission channel at least, and described judge module judges in the following manner whether described channel transmission quality satisfies described video transmission condition:
During greater than first thresholding, described channel transmission quality does not satisfy described video transmission condition at the Block Error Rate of described bottom video transmission channel;
During less than second thresholding, described channel transmission quality satisfies described video transmission condition at the Block Error Rate of described bottom video transmission channel.
Embodiment of the present invention compared with prior art, the main distinction and effect thereof are: there are tangible difference in the present invention temporarily only passes voice when channel degradation processing mode and existing video rollback, video rollback needs and network negotiate are redistributed the channel resource of transferring voice 12.2kbps relative narrower, and, the video rollback or hang up after, need the user to initiate video call once more and could carry out video calling once more.Because the user can't know the transmission quality of present wireless environment, visual telephone might can't be initiated once more.And the processing mode among the present invention is the bottom transmission channel that keeps the 64kbps of original transmission of video phone, carry out the transmission of speech data and control signaling by this channel, thereby guarantee when channel degradation, visual telephone can not be hung up or rollback is common voice call, after wireless environment recovers, do not need the user to participate in simultaneously, recover video calling automatically, improve the fluency of user's communication, improved the user's communication Quality of experience.
In addition, existing video rollback needs and network negotiate are redistributed the channel resource of transferring voice 12.2kbps relative narrower, because this moment, wireless environment was relatively poor, channel bit error rate is higher, and the speech quality of plain old telephone also can't guarantee; And the present invention directly the bottom transmission channel of the 64kbps by original transmission of video phone carry out voice data transmission; because broader bandwidth is simultaneously without transmitting video data; thereby can carry out the redundancy encoding protection to speech data; there is certain error rate to transmit speech data and the 324 control signalings that redundancy encoding is protected on the transmission channel of broad relatively simultaneously at this; at this moment speech data is owing to carried out redundancy protecting; transmission quality is better relatively, thereby can guarantee speech quality relatively preferably.
Description of drawings
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Fig. 1 is a video communication structural representation in the video telephony call control method of first embodiment of the invention;
Fig. 2 is the video telephony call control method flow chart of first embodiment of the invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, embodiments of the present invention are described in further detail below in conjunction with accompanying drawing.
First embodiment of the invention relates to a kind of video telephony call control method.
In the present embodiment, between 3G higher-layer protocols and 3G 324 protocol stacks, increase a channel quality Indication message, as shown in Figure 1.After visual telephone is set up, in the video call process, the 3G higher-layer protocols regularly reports the bottom channel transmission quality to 3G 324 protocol stacks, mainly comprises transmission channel Block Error Rate (Block Error Rate is called for short " BLER ") situation.324 protocol stacks carry out smoothing processing for the BLER that the 3G upper-layer protocol reports, and after BLER arrives certain threshold value, think that the bottom transmission channel can't satisfy the transmission of video.In order to guarantee basic voice communication, terminal at first temporarily stops the transmission of video data, and a transmitting audio data and 324 is controlled signalings, and speech data is carried out redundancy protecting.Receive the speech data and 324 control signalings of redundancy protecting when the opposite end after, also stop the speech data and the 324 control signalings of a transmission transmitting redundancy protection of video, at this moment both sides only carry out voice communication.After 324 protocol stacks find that the transmission quality of bottom recovers, restart normal video calling.
Need to prove, determine the bottom channel transmission quality by BLER in the present embodiment, it is an example, in actual applications, can also judge channel transmission quality by other standards, as bottom signal to noise ratio (Signal to Noise Ratio, be called for short " SNR ") whether low excessively (being lower than preset value), whether demodulation quality is relatively poor, and whether physical layer frequent step-out etc.
At TD SDMA (Time Division Synchronous Code Division Multiple Access, be called for short " TD-SCDMA ") in the system since up-downgoing be transmitted on the same frequency, can be with the up transmission quality of descending transmission quality estimation.When descending reception was relatively poor, uplink also can be relatively poor.
Idiographic flow as shown in Figure 2, after the visual telephone of terminal A and terminal B is connected, enter step 201, the 3G higher-layer protocols of terminal A and terminal B mainly comprises transmission channel BLER situation regularly to the 3G of this terminal 324 protocol stack reporting channel quality indication message in message.
In step 202, the channel quality indication that 324 protocol stacks of terminal A report according to bottom 3G higher-layer protocols finds that the bottom transmission channel can't satisfy the condition of video transmission, can be bottom transmission channel BLER greater than first thresholding, stop video transmission this moment.To the speech data of distant terminal B transmitting redundancy protection, and the notice distant terminal that H.245 increases in the protocol stack begins the speech data of transmitting redundancy protection and the Indication message of correlative coding mode.
Here the method that speech data is carried out redundancy protecting has two kinds:
1) changes the higher relatively voice coding modes of original compression ratio, use the relatively low coded system of compression ratio, as draw together pulse code modulation (the Pulse Code Modulation of 64Kbps, be called for short " PCM "), comprise PCMU (G.711U) (PCMU Pulse Code Modulation, Mu-law), or PCMA (G.711A) (PCMA Pulse Code Modulation, A-law); The perhaps adaptive difference pulse code of 32Kbp modulation (adaptive difference pulse code modulation is called for short " ADPCM ").Even speech data is wrong to some extent or lose on the bottom transmission channel like this, distant terminal also can recover voice when receiving preferably.Wherein, PCMU and PCMA are respectively two kinds of coded systems of PCM, specifically can consult ITU-T G.711.
2) original coded audio data is carried out error correction coding once more, distant terminal can be correctly decoded the raw tone coded data like this.
In order to begin this terminal (terminal A) speech data is carried out redundancy protecting and the respective coding mode is informed distant terminal (terminal B), can in the H.245 agreement of protocol stack H.324, increase redundant voice transmission a beginning indication and a redundant voice transmission ending indication, begin to indicate by redundant voice transmission and inform that the opposite end begins the speech data of transmitting redundancy protection, and the coded system of carrying out redundancy protecting; Inform that by the indication of redundant voice transmission ending the opposite end stops the speech data of transmitting redundancy protection.
In step 203; terminal B receives the speech data of the redundancy protecting that terminal A transmits, and H.245 in the agreement after newly-increased redundant voice transmission beginning indication; temporary transient deterioration has appearred in the wireless environment of knowing terminal A, can't satisfy the requirement of video transmission, can only transmitting audio data.The coded system of terminal B indication during transmission begins to indicate according to this redundant voice is decoded to the speech data of receiving, and, also begin to send speech data, and redundant voice transmission beginning indication of redundancy protecting to terminal A.
Afterwards, both sides all stop the transmission of video data, only carry out the speech data of redundancy protecting and the transmission of 324 control signalings.
Find that at terminal A the bottom transmission quality recovers, in the time of can satisfying the video transmission condition, enter step 204, recover to send video data, and send H.245 agreement redundant voice transmission ending indication to terminal B.Equally, judging that the bottom channel transmission quality satisfies the video transmission condition, can be that bottom transmission channel BLER is less than second thresholding.
In step 205, after terminal B receives that terminal A transmits complete video data and H.245 agreement redundant voice transmission ending is indicated, know that the wireless transmission of terminal A recovers, again satisfy the requirement of transmission, recovery is to terminal A transmitting video data, and sends H.245 agreement redundant voice transmission ending indication to terminal A.
Afterwards, the video calling between terminal A and the terminal B recovers.
In sum, there are tangible difference in the present invention temporarily only passes voice when channel degradation processing mode and existing video rollback, video rollback needs and network negotiate are redistributed the channel resource of transferring voice 12.2kbps relative narrower, and, the video rollback or hang up after, need the user to initiate video call once more and could carry out video calling once more.Because the user can't know the transmission quality of present wireless environment, visual telephone might can't be initiated once more.And the processing mode among the present invention is the bottom transmission channel that keeps the 64kbps of original transmission of video phone, carry out the transmission of speech data and control signaling by this channel, thereby guarantee when channel degradation, visual telephone can not be hung up or rollback is common voice call, after wireless environment recovers, do not need the user to participate in simultaneously, recover video calling automatically, improve the fluency of user's communication, improved the user's communication Quality of experience.
And existing video rollback needs and network negotiate are redistributed the channel resource of transferring voice 12.2kbps relative narrower, because this moment, wireless environment was relatively poor, channel bit error rate is higher, and the speech quality of plain old telephone also can't guarantee; And the present invention directly the bottom transmission channel of the 64kbps by original transmission of video phone carry out voice data transmission; because broader bandwidth is simultaneously without transmitting video data; thereby can carry out the redundancy encoding protection to speech data; there is certain error rate to transmit speech data and the 324 control signalings that redundancy encoding is protected on the transmission channel of broad relatively simultaneously at this; at this moment speech data is owing to carried out redundancy protecting; transmission quality is better relatively, thereby can guarantee speech quality relatively preferably.
Second embodiment of the invention relates to a kind of video telephony call control device, comprises: detection module, be used at video call process, and regularly detect bottom video transmission channel transmission quality; Transport module is used for by bottom video transmission channel transmitting video data, speech data and control signaling; Judge module is used to judge that detection module detects channel transmission quality and whether satisfies the video transmission condition, if do not satisfy, then indicates transport module to stop transmitting video data, only by bottom video transmission channel transmitting audio data and control signaling; When detection module detected channel transmission quality and satisfies the video transmission condition again, the indication transport module restarted by this bottom video transmission channel transmitting video data.
This device can also comprise: coding module is used for speech data is carried out the redundancy encoding protection; Judge module also is used for when judging that detection module detects channel transmission quality and do not satisfy the video transmission condition, and the indication coding module carries out the redundancy encoding protection to speech data; Transport module is by the speech data after the bottom video transmission channel transmitting redundancy coding protection.
Coding module can carry out the redundancy encoding protection to speech data in the following way: change the higher relatively speech coding mode of original compression ratio, use the voice coding modes of little compressible that speech data is encoded.The voice coding modes of little compressible comprises at least: the PCMU of 64Kbps (G.711U), the perhaps PCMA of 64Kbps (G.711A), perhaps the adaptive differential PCM of 32Kbp.Even speech data is wrong to some extent or lose on the bottom transmission channel like this, distant terminal also can recover voice when receiving preferably.
Coding module can also carry out the redundancy encoding protection to speech data in the following way: on the basis of original speech coding, original vocoded data is carried out error correction coding once more.Distant terminal can be correctly decoded the raw tone coded data like this.
As to improvement of the technical scheme, bottom video transmission channel transmission quality criterion comprises the Block Error Rate of this bottom video transmission channel at least, judge module judges in the following manner whether channel transmission quality satisfies the video transmission condition: during greater than first thresholding, channel transmission quality does not satisfy the video transmission condition at the Block Error Rate of bottom video transmission channel; During less than second thresholding, channel transmission quality satisfies the video transmission condition at the Block Error Rate of bottom video transmission channel.
As seen, there are tangible difference in the present invention temporarily only passes voice when channel degradation processing mode and existing video rollback, video rollback needs and network negotiate are redistributed the channel resource of transferring voice 12.2kbps relative narrower, and, the video rollback or hang up after, need the user to initiate video call once more and could carry out video calling once more.Because the user can't know the transmission quality of present wireless environment, visual telephone might can't be initiated once more.And the processing mode among the present invention is the bottom transmission channel that keeps the 64kbps of original transmission of video phone, carry out the transmission of speech data and control signaling by this channel, thereby guarantee when channel degradation, visual telephone can not be hung up or rollback is common voice call, after wireless environment recovers, do not need the user to participate in simultaneously, recover video calling automatically, improve the fluency of user's communication, improved the user's communication Quality of experience.
And existing video rollback needs and network negotiate are redistributed the channel resource of transferring voice 12.2kbps relative narrower, because this moment, wireless environment was relatively poor, channel bit error rate is higher, and the speech quality of plain old telephone also can't guarantee; And the present invention directly the bottom transmission channel of the 64kbps by original transmission of video phone carry out voice data transmission; because broader bandwidth is simultaneously without transmitting video data; thereby can carry out the redundancy encoding protection to speech data; there is certain error rate to transmit speech data and the 324 control signalings that redundancy encoding is protected on the transmission channel of broad relatively simultaneously at this; at this moment speech data is owing to carried out redundancy protecting; transmission quality is better relatively, thereby can guarantee speech quality relatively preferably.
Though pass through with reference to some of the preferred embodiment of the invention, the present invention is illustrated and describes, but those of ordinary skill in the art should be understood that and can do various changes to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (13)
1. a video telephony call control method is characterized in that, comprises following steps:
In video call process, regularly detect bottom video transmission channel transmission quality;
Do not satisfy the video transmission condition if detect described bottom video transmission channel transmission quality, then stop transmitting video data, only by this bottom video transmission channel transmitting audio data and control signaling;
Again satisfy described video transmission condition if detect described bottom video transmission channel transmission quality, then restart to transmit described video data by this bottom video transmission channel.
2. video telephony call control method according to claim 1 is characterized in that, in the described only step by bottom video transmission channel transmitting audio data and control signaling, described speech data is carried out the redundancy encoding protection.
3. video telephony call control method according to claim 2 is characterized in that, described redundancy encoding protection is: use the voice coding modes of little compressible that described speech data is encoded.
4. video telephony call control method according to claim 3, it is characterized in that, the voice coding modes of described little compressible comprises at least: the pulse code modulation PCMU of 64Kbps G.711U, the perhaps pulse code modulation PCMA of 64Kbps G.711A, the perhaps adaptive difference pulse code of 32Kbp modulation.
5. video telephony call control method according to claim 2 is characterized in that, described redundancy encoding protection is: on the basis of original speech coding, original vocoded data is carried out error correction coding once more.
6. video telephony call control method according to claim 1, it is characterized in that, the mode that described timing detects bottom video transmission channel transmission quality is: increase a channel quality Indication message between 3G higher-layer protocols and 3G 324 protocol stacks, described 3G higher-layer protocols regularly by described channel quality Indication message, reports bottom video transmission channel transmission quality to described 3G 324 protocol stacks.
7. according to any described video telephony call control method in the claim 1 to 6, it is characterized in that described bottom video transmission channel transmission quality criterion comprises the Block Error Rate of this bottom video transmission channel at least;
During greater than first thresholding, described channel transmission quality does not satisfy described video transmission condition at the Block Error Rate of described bottom video transmission channel;
During less than second thresholding, described channel transmission quality satisfies described video transmission condition at the Block Error Rate of described bottom video transmission channel.
8. a video telephony call control device is characterized in that, comprises:
Detection module is used at video call process, regularly detects bottom video transmission channel transmission quality;
Transport module is used for by described bottom video transmission channel transmitting video data, speech data and control signaling;
Judge module, be used to judge that described detection module detects channel transmission quality and whether satisfies the video transmission condition, if do not satisfy, then indicate described transport module to stop transmitting video data, only by described bottom video transmission channel transmitting audio data and control signaling; When described detection module detects described channel transmission quality and satisfies described video transmission condition again, indicate described transport module to restart to transmit described video data by this bottom video transmission channel.
9. video telephony call control device according to claim 8 is characterized in that, also comprises:
Coding module is used for described speech data is carried out the redundancy encoding protection;
Described judge module also is used for indicating described coding module that described speech data is carried out the redundancy encoding protection when judging that described detection module detects channel transmission quality and do not satisfy the video transmission condition;
Described transport module transmits speech data after the protection of described redundancy encoding by described bottom video transmission channel.
10. video telephony call control device according to claim 9; it is characterized in that described coding module carries out the redundancy encoding protection to described speech data in the following way: use the voice coding modes of little compressible that described speech data is encoded.
11. video telephony call control device according to claim 10, it is characterized in that, the voice coding modes of described little compressible comprises at least: the pulse code modulation PCMU of 64Kbps G.711U, the perhaps pulse code modulation PCMA of 64Kbps G.711A, the perhaps adaptive difference pulse code of 32Kbp modulation.
12. video telephony call control device according to claim 9 is characterized in that, described coding module carries out the redundancy encoding protection to described speech data in the following way:
On the basis of original speech coding, original vocoded data is carried out error correction coding once more.
13. video telephony call control device according to claim 8 is characterized in that,
Described bottom video transmission channel transmission quality criterion comprises the Block Error Rate of this bottom video transmission channel at least, and described judge module judges in the following manner whether described channel transmission quality satisfies described video transmission condition:
During greater than first thresholding, described channel transmission quality does not satisfy described video transmission condition at the Block Error Rate of described bottom video transmission channel;
During less than second thresholding, described channel transmission quality satisfies described video transmission condition at the Block Error Rate of described bottom video transmission channel.
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| CN107925511B (en) * | 2015-08-14 | 2019-06-04 | 高通股份有限公司 | Sender side visual telephone degrades |
| CN105208315A (en) * | 2015-09-23 | 2015-12-30 | 宇龙计算机通信科技(深圳)有限公司 | Application control method and device |
| CN105323529A (en) * | 2015-10-19 | 2016-02-10 | 掌赢信息科技（上海）有限公司 | Method for switching between audio call and video call, and electronic equipment |
| WO2021120511A1 (en) * | 2019-12-17 | 2021-06-24 | 腾讯科技（深圳）有限公司 | Network session switching method and apparatus, and computer device and storage medium |
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| CN102025963B (en) | 2013-06-05 |
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Application publication date: 20110420 Assignee: Shanghai Li Ke Semiconductor Technology Co., Ltd. Assignor: Leadcore Technology Co., Ltd. Contract record no.: 2018990000159 Denomination of invention: Method and device for controlling call of video telephone Granted publication date: 20130605 License type: Common License Record date: 20180615 |