CN107689945B - Media conversion equipment control method and device and media gateway - Google Patents
Media conversion equipment control method and device and media gateway Download PDFInfo
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- CN107689945B CN107689945B CN201610638541.6A CN201610638541A CN107689945B CN 107689945 B CN107689945 B CN 107689945B CN 201610638541 A CN201610638541 A CN 201610638541A CN 107689945 B CN107689945 B CN 107689945B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/10—Architectures or entities
- H04L65/1016—IP multimedia subsystem [IMS]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/1066—Session management
- H04L65/1083—In-session procedures
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/75—Media network packet handling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/60—Network streaming of media packets
- H04L65/75—Media network packet handling
- H04L65/765—Media network packet handling intermediate
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
- H04L65/80—Responding to QoS
Abstract
The embodiment of the invention provides a method and a device for controlling a media conversion device and a media gateway. In the scheme, compared with the scheme that the working mode of the media conversion equipment is controlled after the control message is generated according to the SDP information on the control plane, the working mode of the media conversion equipment is controlled by the scheme that the interruption lasts for several seconds to tens of seconds, the call interruption time can be shortened to a great extent, the effect of quickly recovering the call is realized, the quality of service provided by an operator is ensured, and the user experience and the benefits of the operator are ensured.
Description
Technical Field
The present invention relates to the field of communications, and in particular, to a method and an apparatus for controlling a media conversion device, and a media gateway.
Background
When one terminal needs to communicate with the other terminal, the two terminals need to collect sound signals in the environment where the terminals are located in the communication process, and encode the collected sound information to form media data, and for the terminals of the two terminals conducting video communication, the terminals participating in encoding also comprise image information collected by the terminals. Before the Call is established, the two parties of the Call negotiate what encoding method should be used by each party to encode the media data through the Call control network, and the following briefly describes the process of establishing a Call between the two terminals with reference to the networking diagram in the SRVCC (Single Radio Voice Call Continuity) scenario shown in fig. 1 and the interaction diagram shown in fig. 2:
s201, the second terminal 15 initiates a call request.
The call request initiated by the second terminal 15 may be transmitted through SIP signaling, and in the SIP signaling, the second terminal 15 may carry information of the media encoding capability supported by the second terminal through SDP (Session Description Protocol) information. Assume that the EVS (Enhanced Voice Services, Enhanced Voice call service codec) Primary mode (Primary) currently adopted by the second terminal performs encoding of the media data.
S202, the call control network forwards the call request to the first terminal 11.
The originated call reaches a call control network including an MSC (Mobile Switching center) 13 and an SCC AS (Service centralized and Continuity Application Server) 14 through a base station (or node device) 12 and the like. The call control network will forward the call request to the first terminal 11, which is the object of the second terminal 15 requesting the call.
S203, the first terminal 11 sends a response message to the second terminal 15 after receiving the call request.
It is assumed that the EVS Primary codec capability is also carried in the response message sent by the first terminal 11 to the second terminal 15.
S204, the call control network receives the response message of the first terminal 11, and forwards the message to the second terminal 15.
In this case, through negotiation of the control plane, the second terminal 15 and the first terminal 11 may implement media data interaction through the EVS Primary encoding mode, and on this basis, a call may be made as long as the first terminal 11 is connected to make a call and generates a response. At this time, the path for transmitting media data between the first terminal 11 and the second terminal is direct from the media plane without any intermediate device for forwarding, that is, "the first terminal 11< - > the second terminal 15", as shown in fig. 1, the first media data path 16.
Once any one of the first terminal 11 and the second terminal 15 no longer supports the EVS Primary coding scheme, for example, the second terminal 15 enters a CS (circuit Switch) domain from an IMS (IP Multimedia Subsystem) domain, and since the CS domain does not support the coding scheme of the EVS Primary mode, at this time, the second terminal 15 can only support an AMR-WB (Adaptive Multi-Rate-Wideband coding/decoding) coding scheme. The AMR-WB and EVS main modes are two encoding modes that are incompatible with each other, so the first terminal 11 and the second terminal 15 can no longer use the encoding modes supported by each other to directly communicate, and a MGW (Media Gateway) 17 is added between the two, and at this time, the bearer path of the Media plane is changed to "the first terminal 11< - > the Media Gateway 17< - > the second terminal 15". If the encoding methods used by the first terminal 11 and the second terminal 15 are compatible, the media gateway 17 does not re-encode the media data after receiving the media data, and may send the media data directly to the receiving end after re-encapsulating the encapsulation format of the receiving end of the media data, and this operation mode of the media gateway is called a transcoding-free mode. However, if the encoding schemes used by the first terminal 11 and the second terminal 15 are not compatible with each other, this mode of operation of the media gateway 17 is no longer valid, and for this case, the prior art has two main solutions:
first, after the call control network determines that the coding modes currently supported by the first terminal 11 and the second terminal 15 are incompatible with each other according to the SDP information reported by the control plane, the mobile switching center 13 sends a control message to the first terminal 11 from the control plane through the service centralization and continuity application server 14, so that the first terminal 11 switches the coding mode used by the first terminal 11 to the coding mode compatible with AMR-WB through the EVS main mode. The control message may also pass through some base stations (or nodes) 12 before being received by the first terminal 11, and the generation and transmission of the control message, together with the switching of the encoding mode of the first terminal 11 according to the control message, may take several seconds to ten and several seconds, during which time the first terminal 11 and the second terminal 15 are unable to communicate, and the call is in an interrupted state.
Secondly, after the call control network determines that the current supported coding modes of the first terminal 11 and the second terminal 15 are incompatible with each other according to the SDP information reported by the control plane of the control plane message, the mobile switching center 13 therein will issue a control message through the control plane, control the media gateway 17 to work in the transcoding mode, and in the transcoding mode, the media gateway 17 will use a transcoding resource to re-encode the media data interacted between the first user terminal and the second terminal in the coding mode of the data receiving terminal. Although the control method can shorten the time for interrupting the call between the first terminal 11 and the second terminal 15 and advance the time for recovering the normal call, generally speaking, the method for controlling the media gateway to switch the working mode by sending the control message through the control plane is slow, and the call is interrupted for a while.
Therefore, both of the above two ways may cause the call to be interrupted for a period of time, although the interruption time is only between a few seconds and a dozen seconds, this not only causes inconvenience to the user, but also may cause huge loss, because the user may need to transmit or receive important information of the opposite end to the opposite end during the period of time; in addition, a large number of users are forced to interrupt the call due to the situation, which results in low user experience, which may cause complaints of users with large area, which is a damage to the benefit and service quality of the operator. Therefore, it is desirable to provide a solution for rapidly recovering the normal call from the interruption when the coding methods of the two parties are incompatible with each other during the call.
Disclosure of Invention
The embodiment of the invention provides a media conversion equipment control method, a device and a media gateway, and mainly solves the technical problems that: the method is different from the prior art and is used for rapidly restoring the interrupted conversation of the two parties under the condition that the coding modes of the two parties are different.
To solve the foregoing technical problem, an embodiment of the present invention provides a method for controlling a media conversion device, including:
acquiring first media data sent by a first user terminal to a second user terminal through media conversion equipment;
when the first coding mode of the first media data is determined to be incompatible with the second coding mode used by the second user terminal, controlling the media conversion equipment to work in a transcoding mode; and in the transcoding mode, the media conversion equipment adopts transcoding resources to recode the media data interacted between the first user terminal and the second terminal by adopting a coding mode of a data receiving end.
An embodiment of the present invention further provides a control device for a media conversion device, including:
the acquisition module is used for acquiring first media data which are sent to a second user terminal by a first user terminal through a media conversion device;
the control module is used for controlling the media conversion equipment to work in a transcoding mode when the first coding mode of the first media data is determined to be incompatible with the second coding mode used by the second user terminal; and in the transcoding mode, the media conversion equipment adopts transcoding resources to recode the media data interacted between the first user terminal and the second terminal by adopting a coding mode of a data receiving end.
An embodiment of the present invention further provides a computer storage medium, where a computer-executable instruction is stored in the computer storage medium, and the computer-executable instruction is used to execute any one of the foregoing media conversion device control methods.
The invention has the beneficial effects that:
according to the method, the device, the media gateway and the computer storage medium for controlling the media conversion equipment, provided by the embodiment of the invention, by acquiring first media data sent by a first user terminal to second user equipment through the media conversion equipment, then determining whether the media conversion equipment needs to work in a transcoding mode according to the coding mode of the first media data, and when determining that the coding mode adopted by the media data sent by the first user terminal to the second user terminal is a coding mode incompatible with the second user terminal, controlling the media conversion equipment to work in a transcoding mode, and recoding the media data interacted between the first terminal and the second terminal by using transcoding resources according to the coding mode compatible with a data receiving end. In the scheme, the operating mode of the media conversion device is controlled according to the encoding format of the first media data, so that the media conversion device can be determined to operate in the transcoding mode according to the first media data of the first frame sent by the first user terminal after the encoding format of the first user terminal is incompatible with the encoding format of the second user terminal. That is, in the solution provided by the embodiment of the present invention, the media data sent by the first user terminal to the second user terminal loses at most one frame, so that the communication between the two terminals can be recovered to normal, and the time for sending one frame of data is much shorter than the time of several seconds, even ten and several seconds. Therefore, compared with the scheme that the working mode of the media conversion equipment is controlled after the control message is generated according to the SDP information on the control plane, the scheme that the interruption lasts for several seconds to tens of seconds can shorten the interruption time of the call to a great extent, realize the effect of quickly recovering the call, ensure the quality of service provided by an operator and ensure the user experience and the benefits of the operator.
Drawings
Fig. 1 is a networking diagram in an SRVCC scenario;
FIG. 2 is an interaction diagram of two terminals when establishing a call;
fig. 3 is a flowchart of a method for controlling a media conversion device according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a control device of a media conversion apparatus according to a third embodiment of the present invention;
fig. 5 is a schematic structural diagram of a control device of a media conversion apparatus according to a fourth embodiment of the present invention;
fig. 6 is a schematic hardware structure diagram of a server according to a fifth embodiment of the present invention;
fig. 7 is a schematic hardware structure diagram of a media gateway according to a fifth embodiment of the present invention.
Detailed Description
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
The first embodiment is as follows:
in the process of a call, if the media data encoding methods used by the two parties are incompatible suddenly, the two parties may be interrupted for a period of time, and in the prior art, the interruption time is as long as several seconds or even ten and several seconds, which may affect the user experience to a certain extent.
The method for controlling a media conversion device provided in this embodiment may be implemented on a control apparatus of a media conversion device, and is described below with reference to fig. 3:
s302, the media conversion equipment control device acquires first media data which are sent to a second user terminal by a first user terminal through media conversion equipment.
For the SRVCC scenario, some descriptions have been made above, and it should be understood by those skilled in the art according to the content shown in fig. 1 that in the SRVCC scenario, on the media plane, the first user terminal directly sends the media data to the media conversion device, that is, in the SRVCC scenario, the bearer path of the media plane should be "the first user terminal < - > the media conversion device < - > the second user terminal", so in this scenario, the media conversion device control apparatus may directly obtain the first media data sent by the first user terminal to the media conversion device.
An Enhanced Single Radio Voice Call Continuity (SRVCC) is based on SRVCC, and an Access Control Function (ATCF) is added AS a pre-configured network element of an SCC AS, instead of the SCC AS, AS a signaling plane anchor point, and an Access Gateway (ATGW) AS a media plane anchor point together with the ATCF. So in this case, the bearer path of the media plane is "the first user terminal < - - > ATGW < - - > the second user terminal". In this scenario, the media data between the first user terminal and the second user terminal will inevitably pass through the ATGW, and for the first user terminal, the encoding format of the media data between the first user terminal and the ATGW is already determined, so that the first user terminal will not be affected by the second user terminal regardless of how the encoding mode of the second user terminal is switched. Therefore, in an eSRVCC scenario between the first user terminal and the second user terminal, if the second user terminal arrives at the CS domain, the EVS main mode coding is no longer supported, and only the AMR-WB coding mode can be used, the media plane bearer path between the second user terminal and the first user terminal becomes "first user terminal < - > ATGW < - > media switching device < - > second user terminal", at this time, the first media data acquired by the media switching device control apparatus no longer directly originates from the first user terminal, because the first user terminal sends the first media data to the ATGW and then the ATGW sends the first media data to the media gateway.
On the basis, in the prior art, in the method of notifying the first user terminal to switch to the coding mode thereof through the control plane message to quickly recover the call, the control message of the control plane is not transmitted to the first user terminal, but transmitted to the ATCF corresponding to the ATGW, and the ATCF notifies the ATGW of changing the coding mode thereof after receiving the control message, thereby recovering the call with the second user terminal. This can reduce the duration of the call interruption to some extent, but this method is also controlled according to the control plane message, and the time from the generation of the control plane control message to the transmission still exists, but the transmission time is slightly shorter. According to the control method of the media conversion device provided in this embodiment, at this time, the media conversion device control apparatus may acquire the first media data that is sent by the first user terminal to the media conversion device through the ATGW.
S304, the media conversion equipment control device determines that the first coding mode of the first media data is incompatible with the second coding mode used by the second user terminal.
In this embodiment, the condition that the first media data and the second encoding scheme, which is the encoding scheme used by the second user terminal, are incompatible with each other means that the first encoding scheme is incompatible with the second encoding scheme, and the second encoding scheme is also incompatible with the first encoding scheme, where several exemplary incompatible conditions include: either one of the first user terminal and the second user terminal uses a main mode of enhanced voice call service coding and decoding, namely an EVS Primary mode, and the other one uses an EVS compatible mode; or one of the first coding mode and the second coding mode is an EVS Primary mode, and the other one is a wideband adaptive multi-rate coding mode, namely an AMR-WB mode.
Under the SRVCC and eSRVCC scenarios, when the first user terminal or the second user terminal switches the CS domain from the IMS domain, the most common alternative coding scheme is the AMR-WB scheme, where the AMR-WB codec is a wideband multi-rate speech codec algorithm for 3G networks defined by 3GPP (3rd Generation Partnership Project), and the bandwidth of the processed speech spectrum is 50Hz to 7000Hz, which is one of the currently widely used high-definition codecs.
And S306, the media conversion device control device controls the media conversion device to work in the transcoding mode.
Some introduction has been made to the transcoding operating mode of the media conversion device, in the transcoding operating mode, the media conversion device may employ a transcoding resource to re-encode media data interacted between the first user terminal and the second terminal in a coding mode of a data receiving terminal, that is, the media data sent by the first user terminal to the second user terminal is re-encoded according to a currently supported coding mode of the second user terminal and then sent to the second user terminal, and similarly, the media data sent by the second user terminal to the first user terminal may also be re-encoded according to a coding mode recognizable or supportable by the first user terminal. For example, in an example, the first user terminal and the second user terminal both use the EVS main mode to encode media data, but after a call is ongoing for a while, the second user terminal switches from the IMS domain to the CS domain, and since the CS domain does not support the EVS main mode, the second user terminal starts to encode using the AMR-WB coding scheme, where the AMR-WB coding scheme and the EVS main mode are two incompatible coding schemes. That is, if the media data is not converted, even if there is a media conversion device, normal communication between the first user terminal and the second user terminal cannot be performed, and at this time, the media conversion device should operate in a mode that can convert the media data received from the transmitting end into a mode that can be recognized by the receiving end, which is a transcoding operation mode.
The media conversion equipment needs to use the transcoding resources in the transcoding mode, the transcoding resources can be applied by the media conversion equipment control device when needed, and in the mode, when the media conversion equipment does not need the transcoding resources, the transcoding resources can be used by other equipment, so that the utilization rate of the resources can be improved. In another mode, the transcoding resources can also be applied in advance, and only do not participate in the work in the transcoding-free work mode, when the media conversion equipment needs the transcoding resources, the transcoding resources can directly work without going through the application process, and the efficiency can be improved.
It should be understood that what is described in the above flow is a case where after the media conversion device control apparatus acquires the first media data, it is confirmed that the encoding mode of the first media data is incompatible with the media data used by the second user terminal, but it is needless to say that the encoding mode of the first media data acquired by the media conversion device control apparatus may also be compatible with the second encoding mode used by the second user terminal, where the compatibility includes a case where the encoding modes used by the two are the same and some other compatible cases, that is, the first encoding mode is not the same as the second encoding mode, but the two can be mutually identified, for example, either one of the first encoding mode and the second encoding mode is the compatible mode of the EVS, and the other one is the AMR-WB mode. It is even less enumerated for the case that the first encoding scheme is the same as the second encoding scheme, e.g., both are EVS primary modes, both are EVS compatible modes, or both are AMR-WB codec schemes … …, etc.
When the media conversion equipment control device determines that a first coding mode corresponding to the acquired first media data is compatible with a second coding mode used by the second user terminal, the media conversion equipment control device directly controls the media conversion equipment to work in a transcoding-free mode without adopting transcoding resources to participate in the interactive work of the media data between the first user terminal and the second user terminal.
In the method for controlling media conversion equipment provided in this embodiment, during a call, a media conversion equipment control device obtains first media data sent by a first user terminal to a second user terminal from a media plane, then, according to the media data obtained by the media plane, whether the media data coding modes used between the first user terminal and the second user terminal are compatible or not is determined, when the two are determined to be incompatible, the media conversion equipment can be controlled to work in a transcoding working mode, media data interacted between the first user terminal and the second user terminal are recoded by the transcoding resources according to the coding mode of the receiving end, conversation between the first user terminal and the second user terminal is rapidly recovered, and the influence of the condition of conversation interruption caused by incompatibility of the coding modes between the first user terminal and the second user terminal on a user is reduced. And in the prior art, the first user terminal is controlled to switch the coding mode through the control message of the control plane or the media conversion equipment is controlled to switch the working mode through the control message of the control plane, so that the duration of call interruption can be reduced to a great extent, and the user experience is improved.
Example two
The present embodiment provides a method for controlling a media conversion device, which will make some improvements on the basis of the first embodiment:
although the method for controlling a media conversion device provided in this embodiment switches the operation of the media conversion device according to the first media data of the media plane when the encoding modes of the first user terminal and the second user terminal are incompatible with each other, the first user terminal and the second user terminal need to perform transcoding through the media conversion device for a long time to achieve normal communication, and transcoding resources need to spend a certain time when transcoding the media data, that is, transcoding prolongs the delay of sound between two parties of a call. The longer the delay, the worse the user experience, and if it is necessary to always realize a call in the transcoding mode through the media conversion device, both parties to the call need to endure the delay for a long time.
On the other hand, in normal voice call, the two parties of the call hear the voice of the other party actually through the terminal collecting the voice signal and then coding according to the coding format supported by the terminal, then sending the opposite call terminal, the terminal of the opposite call terminal receives the data formed by coding and then decoding according to the corresponding decoding mode, and then outputting through the audio output interface of the terminal to form the voice signal. The audio data is inevitably lossy during the encoding and decoding process, and even more, when the media conversion device operates in the transcoding mode, the media data undergoes two encoding and decoding processes. Therefore, when the coding method between the first user terminal and the second user terminal is not compatible, the call quality may be reduced to some extent, which affects the call quality. In this case, in order to improve the quality of the call sound, the two encoding methods can be adjusted to be compatible, and the second encoding in the media conversion device is avoided. This procedure can be implemented by control messages of the control plane:
when the working mode of the media conversion device is switched by the first media data acquired through the media plane, a control message can be sent to the first user terminal through the control plane, and the first user terminal can switch the coding mode thereof to be compatible with the current coding mode of the second user terminal through the control message, for example, the current AMR-WB coding mode used by the second user terminal, so that the first user terminal can switch the coding mode to the EVS compatible mode after receiving the control message, because the EVS compatible mode supports all 9 rates of AMR-WB coding and decoding, and keeps bit stream compatibility with the existing AMR-WB coder. Therefore, when the EVS coding and decoding and the AMR-WB coding and decoding are communicated, if a compatible mode is adopted, only the conversion of the message encapsulation format is needed, and the conversion of the media format is not needed by the transcoding resources, so that the damage of transcoding to the voice quality can be avoided, the time delay of the media stream is reduced, and the voice quality and the user experience are greatly improved.
When the first user terminal receives the control message and switches the coding mode of the first user terminal into the EVS compatible mode according to the control message, the coding mode of the first media data sent by the first user terminal is changed into the EVS compatible mode, so that when the media conversion equipment control device acquires the first media data sent by the first user terminal and determines that the first coding mode is compatible with the second coding mode used by the second user terminal, the media conversion equipment control device can control the media conversion equipment to work in the transcoding-free mode. At this time, the media conversion device only needs to perform an operation of repackaging the first media data and the second media data sent by the second user terminal.
The method for controlling the media conversion equipment provided by the embodiment of the invention not only can switch the working mode of the media conversion equipment according to the coding mode of the first media data of the media surface at the first time when the coding modes of the first user terminal and the second user terminal are different, so as to ensure the rapid recovery of the conversation between the first user terminal and the second user terminal, but also can control the first user terminal to switch the own coding mode through the control surface message, so that the problems of long-term conversation delay and poor conversation tone quality caused by the fact that the first user terminal and the second user terminal depend on the transcoding of the media conversion equipment for a long time are avoided.
Example three:
the present embodiment provides a media conversion device control apparatus, and the following describes the media conversion device control apparatus in the present embodiment with reference to fig. 4:
the media conversion device control apparatus 40 includes an acquisition module 402 and a control module 404. The obtaining module 402 is configured to obtain first media data that is sent by a first user terminal to a second user terminal through a media conversion device. The control module 404 is configured to control the media conversion apparatus to operate in the transcoding mode when it is determined that the first encoding mode of the first media data is incompatible with the second encoding mode used by the second user terminal.
For the SRVCC scenario, some descriptions have been made above, and it should be understood by those skilled in the art that in the SRVCC scenario, on a media plane, a first user terminal directly sends media data to a media conversion device, that is, in the SRVCC scenario, a bearer path of the media plane should be "a first user terminal < - > a media conversion device < - > a second user terminal", so in this scenario, the obtaining module 402 may directly obtain the first media data sent by the first user terminal to the media conversion device.
The eSRVCC adds an ATCF AS a pre-network element of the SCC AS based on the SRVCC, instead of the SCC AS a signaling plane anchor point, and together with the ATCF, also includes an Access Gateway (ATGW) AS a media plane anchor point. So in this case, the bearer path of the media plane is "the first user terminal < - - > ATGW < - - > the second user terminal". In this scenario, the media data between the first user terminal and the second user terminal will inevitably pass through the ATGW, and for the first user terminal, the encoding format of the media data between the first user terminal and the ATGW is already determined, so that the first user terminal will not be affected by the second user terminal regardless of how the encoding mode of the second user terminal is switched. Therefore, in an eSRVCC scenario between the first user terminal and the second user terminal, if the second user terminal arrives at the CS domain, the EVS main mode coding is no longer supported, and only the AMR-WB coding mode can be used, the media plane bearer path between the second user terminal and the first user terminal becomes "first user terminal < - > ATGW < - > media conversion device < - > second user terminal", at this time, the first media data acquired by the acquisition module 402 does not directly originate from the first user terminal any more, because the first user terminal transmits the first media data to the ATGW and then the ATGW transmits the first media data to the media gateway.
On the basis, in the prior art, in the method of notifying the first user terminal to switch to the coding mode thereof through the control plane message to quickly recover the call, the control message of the control plane is not transmitted to the first user terminal, but transmitted to the ATCF corresponding to the ATGW, and the ATCF notifies the ATGW of changing the coding mode thereof after receiving the control message, thereby recovering the call with the second user terminal. This can reduce the duration of the call interruption to some extent, but this method is also controlled according to the control plane message, and the time from the generation of the control plane control message to the transmission still exists, but the transmission time is slightly shorter. According to the control method of the media conversion device provided in this embodiment, at this time, the media conversion device control apparatus may acquire the first media data that is sent by the first user terminal to the media conversion device through the ATGW.
The control module 404 determines that the first encoding scheme of the first media data is incompatible with the second encoding scheme used by the second user terminal.
In this embodiment, the condition that the first media data and the second encoding scheme, which is the encoding scheme used by the second user terminal, are incompatible with each other means that the first encoding scheme is incompatible with the second encoding scheme, and the second encoding scheme is also incompatible with the first encoding scheme, where several exemplary incompatible conditions include: either one of the first user terminal and the second user terminal uses a main mode of enhanced voice call service coding and decoding, namely an EVS Primary mode, and the other one uses an EVS compatible mode; or one of the first coding mode and the second coding mode is an EVS Primary mode, and the other one is a wideband adaptive multi-rate coding mode, namely an AMR-WB mode.
Under the SRVCC and eSRVCC scenarios, when the first user terminal or the second user terminal switches the CS domain from the IMS domain, the most common alternative coding scheme is the AMR-WB scheme, where the AMR-WB codec is a wideband multi-rate speech codec algorithm for 3G networks defined by 3GPP (3rd Generation Partnership Project), and the bandwidth of the processed speech spectrum is 50Hz to 7000Hz, which is one of the currently widely used high-definition codecs.
Some introduction has been made to the transcoding operating mode of the media conversion device, in the transcoding operating mode, the media conversion device may employ a transcoding resource to re-encode media data interacted between the first user terminal and the second terminal in a coding mode of a data receiving terminal, that is, the media data sent by the first user terminal to the second user terminal is re-encoded according to a currently supported coding mode of the second user terminal and then sent to the second user terminal, and similarly, the media data sent by the second user terminal to the first user terminal may also be re-encoded according to a coding mode recognizable or supportable by the first user terminal. For example, in an example, the first user terminal and the second user terminal both use the EVS main mode to encode media data, but after a call is ongoing for a while, the second user terminal switches from the IMS domain to the CS domain, and since the CS domain does not support the EVS main mode, the second user terminal starts to encode using the AMR-WB coding scheme, where the AMR-WB coding scheme and the EVS main mode are two incompatible coding schemes. That is, if the media data is not converted, even if there is a media conversion device, normal communication between the first user terminal and the second user terminal cannot be performed, and at this time, the control module 404 can only control the media conversion device to operate in a mode that can convert the media data received from the sending end into a mode that can be recognized by the receiving end, which is a transcoding operation mode.
In this way, when the media conversion device does not need the transcoding resources, the transcoding resources can be used by other devices, and the utilization rate of the resources can be improved. In another mode, the transcoding resources can also be applied in advance, and only do not participate in the work in the transcoding-free work mode, when the media conversion equipment needs the transcoding resources, the transcoding resources can directly work without going through the application process, and the efficiency can be improved.
It should be understood that what is described in the above flow is a case where it is confirmed that the encoding mode of the first media data is incompatible with the media data used by the second user terminal after the obtaining module 402 obtains the first media data, but it is needless to say that the encoding mode of the first media data obtained by the obtaining module 402 may also be compatible with the second encoding mode used by the second user terminal, where the compatibility includes a case where the encoding modes used by the two are the same and some other compatible cases, that is, the first encoding mode is not the same as the second encoding mode, but the two can be identified with each other, for example, either one of the first encoding mode and the second encoding mode is the compatible mode of the EVS, and the other one is the AMR-WB mode. It is even less enumerated for the case that the first encoding scheme is the same as the second encoding scheme, e.g., both are EVS primary modes, both are EVS compatible modes, or both are AMR-WB codec schemes … …, etc.
When the control module 404 determines that the first coding mode corresponding to the acquired first media data is compatible with the second coding mode used by the second user terminal, it directly controls the media conversion device to operate in the transcoding-free mode without using transcoding resources to participate in the interactive operation of the media data between the first user terminal and the second user terminal.
In the media conversion device control apparatus 40 provided in this embodiment, during a call, the obtaining module 402 obtains first media data sent by a first user terminal to a second user terminal from a media plane, the control module 404 then determines whether the encoding mode of the media data currently used between the first user terminal and the second user terminal is compatible according to the media data acquired by the media plane, and when it is determined that the encoding mode of the media data is not compatible, the media conversion equipment can be controlled to work in a transcoding working mode, the transcoding resources re-encode the media data interacted between the first user terminal and the second user terminal according to the encoding mode compatible with the receiving end, the conversation between the first user terminal and the second user terminal is quickly recovered, and the influence on the user caused by the condition that the conversation is interrupted due to the fact that the encoding mode between the first user terminal and the second user terminal is incompatible is reduced. And in the prior art, the first user terminal is controlled to switch the coding mode through the control message of the control plane or the media conversion equipment is controlled to switch the working mode through the control message of the control plane, so that the duration of call interruption can be reduced to a great extent, and the user experience is improved.
Example four
This embodiment provides another media conversion device control apparatus, as shown in fig. 5:
the media conversion device control apparatus 40 includes a sending module 406 in addition to the acquisition module 402 and the control module 404.
Although in the media conversion device control apparatus 40 provided in this embodiment, when the encoding manners of the first user terminal and the second user terminal are incompatible with each other, the control module 404 switches the operation of the media conversion device according to the first media data of the media plane, the first user terminal and the second user terminal need to perform transcoding through the media conversion device for a long time to achieve normal communication, and the transcoding resource needs to spend a certain time when transcoding the media data, that is, the transcoding prolongs the delay of sound between two parties of a call. The longer the delay, the worse the user experience, and if it is necessary to always realize a call in the transcoding mode through the media conversion device, both parties to the call need to endure the delay for a long time.
On the other hand, in normal voice call, the two parties of the call hear the voice of the other party actually through the terminal collecting the voice signal and then coding according to the coding format supported by the terminal, then sending the opposite call terminal, the terminal of the opposite call terminal receives the data formed by coding and then decoding according to the corresponding decoding mode, and then outputting through the audio output interface of the terminal to form the voice signal. The audio data is inevitably lossy during the encoding and decoding process, and even more, when the media conversion device operates in the transcoding mode, the media data undergoes two encoding and decoding processes. Therefore, when the coding method between the first user terminal and the second user terminal is not compatible, the call quality may be reduced to some extent, which affects the call quality. In this case, in order to improve the quality of the call sound, the two encoding methods can be adjusted to be compatible, and the second encoding in the media conversion device is avoided. This procedure may be implemented by the sending module 406 by controlling a control message sent towards the first user terminal:
while the obtaining module 402 obtains the first media data via the media plane, and the control module 404 switches the working mode of the media conversion device, the sending module 406 may send a control message to the first user terminal via the control plane, and let the first user terminal switch its encoding mode to be compatible with the current encoding mode of the second user terminal via the control message, for example, the current AMR-WB encoding mode used by the second user terminal, the first user terminal may switch the encoding mode to the EVS compatible mode after receiving the control message, because the EVS compatible mode supports all 9 rates of AMR-WB encoding and decoding, and maintains bit stream compatibility with the existing AMR-WB encoder. Therefore, when the EVS coding and decoding and the AMR-WB coding and decoding are communicated, if a compatible mode is adopted, only the conversion of the message encapsulation format is needed, and the conversion of the media format is not needed by the transcoding resources, so that the damage of transcoding to the voice quality can be avoided, the time delay of the media stream is reduced, and the voice quality and the user experience are greatly improved.
When the first user terminal receives the control message and switches its encoding mode to the EVS compatible mode according to the control message, the encoding mode of the first media data sent by the first user terminal becomes the EVS compatible mode, and therefore, when the obtaining module 402 obtains the first media data sent by the first user terminal and the control module 404 determines that the first encoding mode is compatible with the second encoding mode used by the second user terminal, the control module 404 may control the media conversion apparatus to operate in the transcoding-free mode. At this time, the media conversion device only needs to perform an operation of repackaging the first media data and the second media data sent by the second user terminal.
The control device for the media conversion equipment provided by the embodiment of the invention not only can switch the working mode of the media conversion equipment according to the coding mode of the first media data of the media surface at the first time when the coding modes of the first user terminal and the second user terminal are different, so as to ensure the rapid recovery of the conversation between the first user terminal and the second user terminal, but also can control the first user terminal to switch the own coding mode through the control surface message, so that the problems of long-term conversation delay and poor conversation tone quality caused by the fact that the first user terminal and the second user terminal depend on the transcoding of the media conversion equipment for a long time are avoided.
Example five:
the media conversion device in the foregoing embodiment may be a media gateway, and the media conversion device control apparatus 40 provided in the third embodiment and the fourth embodiment is deployed outside the media gateway, for example, the media conversion device control apparatus 40 is deployed on a server outside the media gateway, and this embodiment provides a server, please refer to fig. 6, where fig. 6 is a schematic structural diagram of an optional server for implementing various embodiments of the present invention, and the server at least includes: an Input Output (IO) bus 61, a processor 62, a memory 63, a memory 64, and a communication device 65. Wherein the content of the first and second substances,
the input/output (IO) bus 61 is connected to other components (the processor 62, the storage 63, the memory 64, and the communication device 65) of the server to which it belongs, respectively, and provides a transmission line for the other components.
The processor 62 typically controls the overall operation of the server to which it belongs. For example, processor 62 performs computations, validation, etc. The processor 62 may be a Central Processing Unit (CPU), among others.
The communication device 65, typically comprising one or more components, allows radio communication between a server to which it belongs and a wireless communication system or network.
The memory 63 stores processor-readable, processor-executable software code containing instructions for controlling the processor 62 to perform the functions described herein (i.e., software execution functions).
The functions of the acquisition module 402 and the sending module 406 in the media conversion apparatus control device 40 may be implemented by the communication device 65 of the server, and the control module 404 may be implemented by the processor 62. The communication device 65 obtains first media data that the first user terminal sends to the second user terminal through the media gateway. Then, the first media data is sent to the processor 62 through an input/output (IO) bus 61, the processor 62 analyzes a first coding mode corresponding to the first media data, determines whether the first coding mode is compatible with a second coding mode used by a second user terminal, and if so, the processor 62 controls the media gateway to work in a transcoding-free working mode; otherwise, if not compatible, the processor 62 controls the media gateway to operate in the transcoding mode. At the same time, the processor 62 controls the communication means 65 to control the first user terminal to switch its coding mode to a way that is compatible with the second coding mode by sending a control message to the first user terminal. When the communication device 65 acquires the first media data sent after the first user terminal switches the working mode, the processor 62 controls the working mode of the media gateway to switch from the transcoding mode to the transcoding-free mode.
In addition, the present embodiment also provides a media gateway, which includes the above media conversion apparatus control device 40, that is, the media conversion apparatus control device 40 is disposed on the media gateway. Referring to fig. 7 and fig. 7, which are schematic hardware structural diagrams of the Media gateway 70, the Media gateway 70 includes a Call Control unit (CCM) 701, a message Processing unit (MPPR) 702, and a transcoding unit 703.
The message processing unit 702 may receive first media data sent by the first user terminal (or ATGW in eSRVCC scenario), and then decapsulate the first media data. After decapsulating the first media data, the message processing unit 702 can preliminarily determine whether a first coding mode corresponding to the first media data is compatible with a second coding mode used by the second user terminal, and if not, report to the call control unit 701, and the call control unit 701 determines whether the first coding mode is compatible with the second coding mode, and whether the transcoding unit 703 is to operate:
if the first encoding mode is compatible with the second encoding mode, the call control unit 701 controls the message processing unit 702 to encapsulate the media data again, and the encapsulated media data is directly sent to the second user terminal without the participation of the transcoding unit 703;
if the media data are not compatible with the second user terminal, the transcoding unit 703 is controlled to decode the media data after the decapsulation of the message processing unit 702, and re-encode the media data according to the coding mode compatible with the second user terminal, and then deliver the media data to the message processing unit 702 to re-encapsulate the media data according to the encapsulation mode recognizable by the second user terminal, and then send the media data out. In addition, while the call control unit 701 controls the transcoding unit 703, the control plane may send a control message to allow the first user terminal to change its encoding mode, and after the first user terminal changes the encoding mode, the packet processing unit 702 decapsulates the currently acquired media data and determines that the current first encoding mode is the same as the second encoding mode, so that the media data may not be transmitted to the transcoding unit 703, but may be re-encapsulated by itself and then transmitted to the second user terminal.
The media gateway provided by the embodiment of the invention not only can switch the working mode of the media conversion equipment according to the coding mode of the first media data of the media surface at the first time when the coding modes of the first user terminal and the second user terminal are different, so as to ensure the rapid recovery of the conversation between the first user terminal and the second user terminal, but also can control the first user terminal to switch the own coding mode through the control surface message, so that the problems of long-term conversation delay and poor conversation tone quality caused by the fact that the first user terminal and the second user terminal depend on the transcoding of the media conversion equipment for a long time are avoided.
It will be apparent to those skilled in the art that the modules or steps of the embodiments of the invention described above may be implemented in a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented in program code executable by a computing device, such that they may be stored on a computer storage medium (ROM/RAM, magnetic disk, optical disk) and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The foregoing is a more detailed description of embodiments of the present invention, and the present invention is not to be considered limited to such descriptions. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (12)
1. A media conversion apparatus control method comprising:
acquiring first media data sent by a first user terminal to a second user terminal through media conversion equipment;
when the first coding mode of the first media data is determined to be incompatible with the second coding mode used by the second user terminal, controlling the media conversion equipment to work in a transcoding mode; and in the transcoding mode, the media conversion equipment adopts transcoding resources to recode the media data interacted between the first user terminal and the second user terminal by adopting a coding mode of a data receiving end.
2. The media conversion apparatus control method of claim 1, further comprising:
when the first encoding mode and the second encoding mode of the first media data are determined to be compatible, controlling the media conversion equipment to work in a transcoding-free mode; in the transcoding mode, the media conversion device does not use transcoding resources to re-encode the media data interacted between the first user terminal and the second user terminal.
3. The media conversion apparatus control method according to claim 2, wherein the case where the first encoding scheme is compatible with the second encoding scheme at least includes:
the first coding mode is the same as the second coding mode;
or the like, or, alternatively,
either one of the first encoding mode and the second encoding mode is a compatible mode of an enhanced voice call service codec, and the other one is a wideband adaptive multi-rate codec.
4. The method for controlling media conversion device according to claim 1, wherein the case where the first encoding scheme of the first media data and the second encoding scheme used by the second user terminal are incompatible with each other at least comprises:
either one of the first coding mode and the second coding mode is a main mode of enhanced voice communication service coding and decoding, and the other one is a compatible mode of enhanced voice communication service coding and decoding;
or the like, or, alternatively,
either one of the first encoding mode and the second encoding mode is a main mode of codec of the enhanced voice call service, and the other one is a wideband adaptive multi-rate codec.
5. The method for controlling media conversion device according to claim 1, wherein the manner of acquiring the first media data sent by the first user terminal to the second user terminal through the media conversion device comprises:
acquiring first media data which is directly sent to the media conversion equipment by a first user terminal;
or the like, or, alternatively,
and acquiring first media data which is sent to the media conversion equipment by the first user terminal through a transmission access gateway.
6. The media conversion apparatus control method of any one of claims 1 to 5, further comprising:
and sending a control message to the first user terminal through a control plane, wherein the control message is used for instructing the first user terminal to switch the coding mode of the first user terminal to a coding mode compatible with the second coding mode.
7. The media conversion apparatus control method of claim 6, further comprising, after the sending of the control message to the first user terminal by the control plane:
determining that a first coding mode used by the acquired first media data is compatible with the second coding mode;
controlling the media conversion equipment to work in a transcoding-free mode; in the transcoding mode, the media conversion device does not use transcoding resources to re-encode the media data interacted between the first user terminal and the second user terminal.
8. A media conversion apparatus control device, comprising:
the acquisition module is used for acquiring first media data which are sent to a second user terminal by a first user terminal through a media conversion device;
the control module is used for controlling the media conversion equipment to work in a transcoding mode when the first coding mode of the first media data is determined to be incompatible with the second coding mode used by the second user terminal; and in the transcoding mode, the media conversion equipment adopts transcoding resources to recode the media data interacted between the first user terminal and the second user terminal by adopting a coding mode of a data receiving end.
9. The control apparatus of claim 8, wherein the control module is further configured to control the media conversion apparatus to operate in a transcoding-free mode when it is determined that the first encoding manner of the first media data is compatible with the second encoding manner; in the transcoding mode, the media conversion device does not use transcoding resources to re-encode the media data interacted between the first user terminal and the second user terminal.
10. The apparatus for controlling media conversion device according to claim 8 or 9, further comprising a sending module, configured to send a control message to the first user terminal through a control plane, where the control message is used to instruct the first user terminal to switch its coding scheme to a coding scheme compatible with the second coding scheme.
11. The apparatus for controlling a media conversion device according to claim 10, wherein the control module is further configured to determine that a first encoding manner used by the acquired first media data is compatible with the second encoding manner, and control the media conversion device to operate in a transcoding-free mode; in the transcoding mode, the media conversion device does not use transcoding resources to re-encode the media data interacted between the first user terminal and the second user terminal.
12. A media gateway comprising media conversion device control means according to any of claims 8 to 11.
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| CN113098829B (en) * | 2019-12-23 | 2023-04-18 | 海能达通信股份有限公司 | Communication method between wide and narrow networks, terminal, server and storage medium |
| CN111565257B (en) * | 2020-04-14 | 2022-11-08 | 深圳震有科技股份有限公司 | Transcoding method, device, system and medium of fax terminal |
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