CN108513320B - Method and device for coding and decoding negotiation - Google Patents
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Abstract
The embodiment of the invention provides a method and a device for coding and decoding negotiation, relates to the technical field of communication, and solves the problem that coding and decoding negotiation between an initiator terminal and a receiver terminal cannot be realized when coding and decoding sets between the two terminals do not have intersection in the prior art. The scheme is as follows: the method comprises the steps that a mobile switching center receives a first coding and decoding list reported by a calling terminal and a second coding list reported by a called terminal, wherein the first coding and decoding list consists of coding and decoding algorithms supported by the calling terminal, the second coding and decoding list consists of coding and decoding algorithms supported by the called terminal, and the first coding and decoding list and the second coding and decoding list have no intersection; determining a target coding and decoding algorithm from the first coding and decoding list and the second coding and decoding list according to the priority of each coding and decoding algorithm, the coding and decoding algorithm which can be compatible with the calling terminal and the coding and decoding algorithm which can be compatible with the called terminal; and respectively sending the determined target coding and decoding algorithm to the calling terminal and the called terminal.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for coding and decoding negotiation.
Background
Terminals in mobile communication networks usually support a plurality of different codecs, and the main codec algorithms adopted in current mobile communication include: adaptive Multi-Rate narrowband Speech coding (AMR-NB for short), Adaptive Multi-Rate wideband Speech coding (AMR-NB for short), Enhanced Voice call Service (EVS for short), ITU-defined G.711 and G.729.
Because the codec algorithms supported by each terminal are different, in order to enable normal communication between terminals supporting different codec sets, it is necessary for the initiator terminal and the receiver terminal to complete negotiation of codec selection through the network, i.e., a codec negotiation mechanism. The prior art provides an out-of-band negotiation mechanism (TrFO for short, also called encoding-Free Operation), which is a technique for negotiating the voice codec mode through an out-of-band call Control signaling (OoBTC for short) in the call setup process. As shown in fig. 1, a schematic diagram of codec negotiation using a TrFO mechanism for an initiator and a receiver is provided in the prior art. The specific process is as follows: the initiator-Mobile Switching Center (MSC) needs to indicate the codec algorithm supported by the initiator's terminal to the network, the transferee-MSC analyzes the received codec list, deletes the unsupported codec algorithm according to the network capability, then the transferee-MSC forwards the modified codec list to the receiver-MSC, the receiver-MSC deletes the unsupported codec algorithm of the receiver's terminal according to the network capability, returns the modified codec list to the transferee-MSC, and selects the target codec, the transferee-MSC returns the codec list and the target codec to the sender-MSC, meanwhile, the receiver-MSC sends the target codec to the receiver-Media Gateway (MGW), the transferee-MSC also sends the target codec to the transferee-MGW, the initiator-MSC will also send the target codec to the initiator-MGW, so that a corresponding bearer is established between the initiator-MGW and the switch-MGW, and a corresponding bearer is also established between the switch-MGW and the receiver-MGW, thereby completing the subsequent voice call service according to the target codec.
However, the above-mentioned flow must be implemented such that the codec set of the terminal of the initiator and the codec set of the terminal of the receiver must have an intersection to complete the codec negotiation. Along with the continuous evolution of the network, the encoding and decoding of the terminals show a trend of greater and greater differentiation, and if the encoding and decoding algorithms between the two terminals do not have intersection, the encoding and decoding negotiation between the two terminals cannot be realized.
Disclosure of Invention
The embodiment of the invention provides a method and a device for coding and decoding negotiation, which solve the problem that coding and decoding negotiation between an initiator terminal and a receiver terminal cannot be realized when coding and decoding sets between the two terminals do not have intersection in the prior art.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect of the embodiments of the present invention, a method for coding and decoding negotiation is provided, where the method includes:
a mobile switching center receives a first coding and decoding list reported by a calling terminal and a second coding list reported by a called terminal, wherein the first coding and decoding list consists of coding and decoding algorithms supported by the calling terminal, the second coding and decoding list consists of coding and decoding algorithms supported by the called terminal, and the first coding and decoding list and the second coding and decoding list have no intersection;
determining a target coding and decoding algorithm from the first coding and decoding list and the second coding and decoding list according to the priority of each coding and decoding algorithm, the coding and decoding algorithm which can be compatible with the calling terminal and the coding and decoding algorithm which can be compatible with the called terminal, wherein: the terminal compatible coding and decoding algorithm is determined according to the capability of the terminal capable of being compatible with the coding and decoding algorithm;
and respectively sending the determined target coding and decoding algorithm to the calling terminal and the called terminal.
In a second aspect of the embodiments of the present invention, a method for coding and decoding negotiation is provided, where the method includes:
the terminal reports the first coding and decoding list or the second coding and decoding list to the mobile switching center; the first coding and decoding list or the second coding and decoding list is composed of coding and decoding algorithms supported by the terminal;
receiving a target coding and decoding algorithm issued by a mobile switching center;
if the target coding and decoding algorithm does not exist in the first coding and decoding list or the second coding and decoding list, acquiring the target coding and decoding algorithm from a service base station of the terminal;
and sending the target coding and decoding algorithm to a media gateway corresponding to the terminal.
In a third aspect of the embodiments of the present invention, a mobile switching center is provided, where the mobile switching center includes:
the receiving module is used for receiving a first coding and decoding list reported by a calling terminal and a second coding list reported by a called terminal, wherein the first coding and decoding list consists of coding and decoding algorithms supported by the calling terminal, the second coding and decoding list consists of coding and decoding algorithms supported by the called terminal, and the first coding and decoding list and the second coding and decoding list have no intersection;
a determining module, configured to determine a target codec algorithm from the first codec list and the second codec list according to a priority of each codec algorithm, a codec algorithm that the calling terminal can be compatible with, and a codec algorithm that the called terminal can be compatible with, where: the terminal compatible coding and decoding algorithm is a coding and decoding algorithm determined according to the capability of the terminal capable of being compatible with coding and decoding;
and the sending module is used for respectively sending the determined target coding and decoding algorithm to the calling terminal and the called terminal.
In a fourth aspect of the embodiments of the present invention, a terminal is provided, where the terminal includes:
a sending module, configured to report the first codec list or the second codec list to the mobile switching center; the first codec list or the second codec list is composed of codec algorithms supported by the terminal;
the receiving module is used for receiving a target coding and decoding algorithm issued by the mobile switching center;
an obtaining module, configured to obtain the target codec algorithm from a serving base station of the terminal if the target codec algorithm does not exist in the first codec list or the second codec list;
and the sending module is also used for sending the target coding and decoding algorithm to the media gateway corresponding to the terminal.
A fifth aspect of embodiments of the present invention provides a computer storage medium, which includes computer instructions, when the computer instructions are executed on a computer, the computer is caused to execute the method for codec negotiation according to the first aspect or the second aspect.
A sixth aspect of the embodiments of the present invention provides a computer program product, which when run on a computer, causes the computer to execute the method for codec negotiation according to the first aspect or the second aspect.
When performing codec negotiation, the codec negotiation between the two terminals cannot be realized in the prior art under the condition that the codec sets between the initiator terminal and the receiver terminal do not have an intersection. Compared with the prior art, the method and the device for coding and decoding negotiation provided by the embodiment of the invention can realize coding and decoding negotiation between the two terminals under the condition that coding and decoding combination between the initiator terminal and the receiver terminal has no intersection. Specifically, the scheme is as follows: receiving a first coding and decoding list reported by a calling terminal and a second coding list reported by a called terminal, wherein the first coding and decoding list consists of coding and decoding algorithms supported by the calling terminal, the second coding and decoding list consists of coding and decoding algorithms supported by the called terminal, and the first coding and decoding list and the second coding and decoding list have no intersection; determining a target coding and decoding algorithm from the first coding and decoding list and the second coding and decoding list according to the priority of each coding and decoding algorithm, the coding and decoding algorithm which can be compatible with the calling terminal and the coding and decoding algorithm which can be compatible with the called terminal, wherein: the terminal compatible coding and decoding algorithm is determined according to the capability of the terminal capable of being compatible with the coding and decoding algorithm; and respectively sending the determined target coding and decoding algorithm to the calling terminal and the called terminal. According to the scheme, the load can be established between the gateway corresponding to the calling terminal and the gateway corresponding to the called terminal, so that normal voice communication can be performed between the calling terminal and the called terminal, and link resources can be saved while the voice communication quality is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic diagram of codec negotiation performed by an initiator and a receiver according to the prior art;
fig. 2 is a schematic diagram of an architecture of a codec negotiation system according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating a method for codec negotiation according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating another codec negotiation method according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a mobile switching center according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 2 is a schematic structural diagram of a codec negotiation system according to an embodiment of the present invention. The Buffer memory in fig. 2 is a storage space in a base station, BS _1 is a serving base station on the calling UE _1 side, BS _2 is a serving base station on the called UE _2 side, and a Mobile Switching Center (hereinafter, referred to as Mobile Switching Center, abbreviated as MSC) is one of important network elements on the core network side.
Based on the system architecture diagram shown in fig. 2, an embodiment of the present invention provides a method for codec negotiation, as shown in fig. 3, where the method includes:
201. the calling terminal reports the first coding and decoding list to the mobile switching center, and the called terminal reports the second coding and decoding list to the mobile switching center.
The first codec list is composed of codec algorithms supported by the calling terminal, the second codec list is composed of codec algorithms supported by the called terminal, and the first codec list and the second codec list have no intersection.
Illustratively, each of the first codec list and the second codec list includes at least two codec algorithms, where: each coding and decoding algorithm corresponds to a coding and decoding capability grade and a priority grade, and the higher the capability grade of the coding and decoding algorithm is, the higher the corresponding priority grade is; the first codec algorithm is the codec algorithm with the highest priority in the first codec list, and/or the second codec algorithm is the codec algorithm with the highest priority in the second codec list.
For example, based on the relationship between the capability level of the codec and the priority of the codec, the first codec algorithm may also be the codec algorithm with the lowest priority in the first codec list, and/or the second codec algorithm may also be the codec algorithm with the lowest priority in the second codec list.
The codec algorithm supported by the calling terminal or the called terminal refers to a codec algorithm that can be used by the calling terminal or the called terminal without format conversion, wherein: the format conversion here may be a circuit conversion in hardware or an algorithm conversion in software. The meaning of the support expressed herein is illustrated here by way of a network as an example. For example, for a 4G handset, the network supported by the handset is a 4G network. The supported network may require a corresponding 4G module for the terminal, but without any format conversion. I.e. no additional further hardware or software conversion is required to enable the 4G handset to support the 4G network.
202. And the mobile switching center determines a target coding and decoding algorithm from the first coding and decoding list and the second coding and decoding list according to the priority of each coding and decoding algorithm, the coding and decoding algorithm which can be compatible with the calling terminal and the coding and decoding algorithm which can be compatible with the called terminal.
Wherein: the terminal compatible coding and decoding algorithm is determined according to the capability of the terminal capable of being compatible with the coding and decoding algorithm. Illustratively, the ability for a terminal to support backwards compatible codecs on hardware circuitry, where backwards compatibility refers to a terminal having a high priority codec algorithm being compatible with a low priority codec algorithm. The priority of the coding and decoding algorithm is proportional to the capability level of the coding and decoding algorithm, specifically: the higher the priority of the codec algorithm, the higher the capability level of the codec algorithm. For example, several specific codecs are given here, among which: the priority ranking order of the coding and decoding algorithm is as follows: FEC < AMR-NB < AMR-WB < EVS, among the four codec algorithms, the priority of the codec algorithm of EVS is the highest and the capability level of the corresponding codec algorithm is the highest, the priority of the codec algorithm of FEC is the lowest and the capability level of the corresponding codec algorithm is the lowest.
It should be noted that the relationship between the capability of the codec algorithm and the priority of the codec is not limited to a direct relationship, and is merely an example, and may also be defined as an inverse relationship in practical applications, and may be specifically set according to actual needs.
The codec algorithm with which the calling terminal or the called terminal can be compatible refers to a codec algorithm that can be used only by the calling terminal or the called terminal through format conversion, wherein: the format conversion here may be a circuit conversion in hardware or an algorithm conversion in software. But the compatibility capability of one terminal is only downward compatible and not upward compatible. Here, the network is taken as an example to illustrate the meaning of the compatibility expression here. For example, for a 4G mobile phone, the network supported by the mobile phone is a 4G network, and the networks compatible with the mobile phone include a 3G network and a 2G network, so that the mobile phone of 4G cannot use the network of 5G because the terminal is only downward compatible. Of course, for a 4G handset to use a 2G or 3G network, it must have a corresponding conversion in hardware or software to make the 4G handset compatible with the 2G or 3G network.
Illustratively, after receiving the first codec list sent by the calling terminal and before receiving the second codec algorithm sent by the called terminal, the method further includes the following steps:
and A1, forwarding the first coding and decoding list of the calling terminal to the called terminal.
And A2, receiving the message of any one codec algorithm in the unselected first codec list returned by the called terminal.
Alternatively, the step 202 may be implemented in the following manner.
202a1, determining a first codec algorithm from the first codec list, a second codec algorithm from the second codec list, and a priority order of the first codec algorithm and the second codec algorithm according to the priority of each codec algorithm.
202a2, determining a target codec algorithm from the first codec algorithm and the second codec algorithm according to the priority order of the first codec algorithm and the second codec algorithm, the codec algorithm compatible with the calling terminal and the codec algorithm compatible with the called terminal.
Optionally, the step 202 specifically includes the following steps:
202b1, selecting a first codec algorithm from the first codec list and a second codec algorithm from the second codec list according to the priority of each codec algorithm.
202b2, determining a target codec algorithm from the first codec algorithm and the second codec algorithm according to the codec algorithm compatible with the calling terminal and the codec algorithm compatible with the called terminal.
Illustratively, the step 202b2 is specifically realized by the following steps:
and B1, determining the coding and decoding algorithm which can be compatible with the calling terminal and the coding and decoding algorithm which can be compatible with the called terminal.
And B2, determining a target coding and decoding algorithm from the first coding and decoding algorithm and the second coding and decoding algorithm according to the coding and decoding algorithm compatible with the calling terminal and the coding and decoding algorithm compatible with the called terminal.
Illustratively, based on the above-mentioned contents of step 202, an example is given here to illustrate how the mobile switching center determines the target codec algorithm. In this example, for the mobile switching center, the capability level of the codec algorithm is proportional to the priority of the codec algorithm, i.e., as the capability level of the codec algorithm increases, the priority of the codec algorithm also increases. For the terminal, the capability level of the coding and decoding algorithm and the priority of the coding and decoding algorithm are in an inverse relation, that is, the priority of the coding and decoding algorithm is reduced along with the increase of the capability level of the coding and decoding algorithm. The set of pre-stored coding and decoding algorithms in the mobile switching center is { v, w, x, y, z }, and the priority among the coding and decoding algorithms in the set of coding and decoding algorithms is: v < w < x < y < z. The calling terminal and the called terminal have the capability of downward compatibility with the coding and decoding algorithm.
And step 2, the mobile switching center forwards the set to the called terminal.
And 3, the called terminal returns the selected coding and decoding algorithm to the mobile switching center as empty and feeds back the coding and decoding algorithm set { x, y, z } supported by the called terminal, wherein x is larger than y and is larger than z, according to the coding and decoding algorithm set Codec _ T { x, y, z } supported by the called terminal.
and step 5, the mobile switching center triggers and judges the priority (the priority sequence v of the coding and decoding algorithm stored in the mobile switching center is more than w and more than x and less than y and less than z), compares the priority of Codec _0{ v } with the priority of Codce _ T { x } and returns the selected coding and decoding algorithm v to the calling terminal and the called terminal at the same time. The coding and decoding algorithm v is a target coding and decoding algorithm.
203. And the mobile switching center respectively sends the determined target coding and decoding algorithm to the calling terminal and the called terminal.
Illustratively, as shown in fig. 3, in the method, the mobile switching center sends the determined target codec algorithm to the calling terminal and the called terminal, and also sends the target codec algorithm to a Media Gateway (MGW). In particular, reference may be made to the flow chart shown in fig. 3.
204. And if the target coding and decoding algorithm does not exist in the first coding and decoding list or the second coding and decoding list, the terminal acquires the target coding and decoding algorithm from a service base station of the terminal.
Illustratively, referring to fig. 3, for the calling terminal, the above step 204 is: and if the target coding and decoding algorithm does not exist in the first coding and decoding list, the calling terminal acquires the target coding and decoding algorithm from a service base station of the terminal. For the called terminal, the above step 204 is: if the target coding and decoding algorithm does not exist in the second coding and decoding list, the called terminal acquires the target coding and decoding algorithm from a service base station of the terminal.
Preferably, in the embodiment of the present invention, various codec algorithms are pre-stored in the service base station of the calling terminal, the calling terminal initiates a request for acquiring a codec algorithm to the service base station of the calling terminal, and the service base station of the calling terminal sends the codec algorithm to the calling terminal, where: here, a codec algorithm refers to any one of various codec algorithms stored in advance in the serving base station.
Preferably, in the embodiment of the present invention, various codec algorithms are also pre-stored in the serving base station of the called terminal, the called terminal initiates a request for acquiring a codec algorithm to the serving base station of the called terminal, and the serving base station of the called terminal sends the codec algorithm to the called terminal, where: here, a codec algorithm refers to any one of various codec algorithms stored in advance in the serving base station.
205. And the terminal sends the target coding and decoding algorithm to a media gateway corresponding to the terminal.
Illustratively, as shown in fig. 3, for the calling terminal, the step 205 described above specifically includes: 205a, the calling terminal sends the target coding and decoding algorithm to the calling-MGW; for the called terminal, the step 205 is specifically: 205b, the called terminal sends the target coding and decoding algorithm to the called MGW.
As shown in fig. 3, based on step 203 in fig. 3, the mobile switching center sends the target codec algorithm to the mobile switching center-MGW, step 205 the calling terminal sends the target codec algorithm to the calling-MGW, and step 205 the called terminal sends the target codec algorithm to the content of the called MGW, such that a bearer is established between the calling-MGW and the mobile switching center-MGW, and between the mobile switching center-MGW and the called-MGW, such that the calling terminal sends the voice content to the calling-MGW, the calling-MGW compresses the voice content with the target codec algorithm to obtain a compressed voice code, after passing through the mobile switching center, the mobile switching center sends the compressed voice code algorithm to the called terminal, the called terminal sends the compressed voice code to the called-MGW, the called-MGW decompresses by a target coding and decoding algorithm to obtain voice content, and then the called-MGW returns the decompressed voice content to the called terminal, so that normal voice communication can be carried out between the calling terminal and the called terminal, and link resources can be saved while the voice communication quality is improved.
When performing codec negotiation, the codec negotiation between the two terminals cannot be realized in the prior art under the condition that the codec sets between the initiator terminal and the receiver terminal do not have an intersection. Compared with the prior art, the method for coding and decoding negotiation provided by the embodiment of the invention can realize coding and decoding negotiation between the two terminals under the condition that coding and decoding combination between the initiator terminal and the receiver terminal has no intersection. Specifically, the scheme is as follows: receiving a first coding and decoding list reported by a calling terminal and a second coding list reported by a called terminal, wherein the first coding and decoding list consists of coding and decoding algorithms supported by the calling terminal, the second coding and decoding list consists of coding and decoding algorithms supported by the called terminal, and the first coding and decoding list and the second coding and decoding list have no intersection; determining a target coding and decoding algorithm from the first coding and decoding list and the second coding and decoding list according to the priority of each coding and decoding algorithm, the coding and decoding algorithm which can be compatible with the calling terminal and the coding and decoding algorithm which can be compatible with the called terminal, wherein: the terminal compatible coding and decoding algorithm is determined according to the capability of the terminal capable of being compatible with the coding and decoding algorithm; and respectively sending the determined target coding and decoding algorithm to the calling terminal and the called terminal. According to the scheme, the load can be established between the gateway corresponding to the calling terminal and the gateway corresponding to the called terminal, so that normal voice communication can be performed between the calling terminal and the called terminal, and link resources can be saved while the voice communication quality is improved.
Based on the above, the embodiment of the present invention provides a specific example to illustrate the scheme. The specific flow chart is shown in fig. 4. Wherein: before the flow in fig. 4 is performed, the conditions preset in this embodiment include: 1. the mobile switching center sets a coding and decoding algorithm set { FEC, AMR-NB, AMR-WB, EVS } and configures priority FEC < AMR-NB < AMR-WB < EVS (EVS has highest priority and FEC has lowest priority) according to coding and decoding capabilities. 2. The calling terminal supports Codec-0{ AMR-NB, FEC } and AMR-NB > FEC. 3. The called terminal supports Codec _ T { AMR-WB, EVS } and EVS > AMR-WB. In the above three conditions, for both the terminal and the mobile switching center, the priority of the codec algorithm is proportional to the capability level of the codec algorithm, and the specific flow is as follows:
And step 2, the mobile switching center forwards the coding and decoding algorithm set to the called terminal.
And 3, the called terminal returns the selected coding and decoding algorithm to the mobile switching center as null according to the coding and decoding algorithm set Codec _ T supported by the called terminal, and feeds back the coding and decoding algorithm set { AMR-WB, EVS } supported by the called terminal, wherein the EVS is larger than the AMR-WB.
And 4, the mobile switching center triggers a decision priority, compares the priority of Codec _0{ AMR-NB } with the priority of Codce _ T { EVS }, simultaneously returns the selected Codec algorithm AMR-NB to the calling terminal and the called terminal, and simultaneously sends the Codec algorithm AMR-NB to the mobile switching center-MGW.
And step 5, the terminal (called terminal in the example) which does not support the coding and decoding algorithm requests the service base station of the terminal to download the selected coding and decoding algorithm AMR-NB through the control channel.
And 6, the calling terminal sends the coding and decoding algorithm AMR-NB to the calling-MGW, and the called terminal sends the coding and decoding algorithm AMR-NB to the called-MGW, so that the calling-MGW, the mobile switching center-MGW and the called-MGW are established.
A mobile switching center provided in an embodiment of the present invention will be described below based on the related description in the embodiment of the method for codec negotiation corresponding to fig. 3. Technical terms, concepts and the like related to the above embodiments in the following embodiments may refer to the above embodiments, and are not described in detail herein.
An embodiment of the present invention provides a mobile switching center, as shown in fig. 5, where the mobile switching center includes: a receiving module 51, a determining module 52 and a sending module 53, wherein:
the receiving module 51 is configured to receive a first coding and decoding list reported by the calling terminal and a second coding list reported by the called terminal.
The first codec list is composed of codec algorithms supported by the calling terminal, the second codec list is composed of codec algorithms supported by the called terminal, and the first codec list and the second codec list have no intersection.
Illustratively, each of the first codec list and the second codec list includes at least two codec algorithms, where: each coding and decoding algorithm corresponds to a coding and decoding capability grade and a priority grade, and the higher the coding and decoding algorithm capability grade is, the higher the corresponding priority grade is; the first codec algorithm is the codec algorithm with the highest priority in the first codec list, and/or the second codec algorithm is the codec algorithm with the highest priority in the second codec list.
For example, based on the relationship between the capability level of the codec algorithm and the priority of the codec algorithm, the first codec algorithm may also be the codec algorithm with the lowest priority in the first codec list, and/or the second codec algorithm may also be the codec algorithm with the lowest priority in the second codec list.
The codec algorithm supported by the calling terminal or the called terminal refers to a codec algorithm that can be used by the calling terminal or the called terminal without format conversion, wherein: the format conversion here may be a circuit conversion in hardware or an algorithm conversion in software. The meaning of the support expressed herein is illustrated here by way of a network as an example. For example, for a 4G handset, the network supported by the handset is a 4G network. The supported network may require a corresponding 4G module for the terminal, but without any format conversion. I.e. no additional further hardware or software conversion is required to enable the 4G handset to support the 4G network.
The determining module 52 is configured to determine a target codec algorithm from the first codec list and the second codec list according to the priority of each codec algorithm, the codec algorithm compatible with the calling terminal, and the codec algorithm compatible with the called terminal.
Wherein: the terminal compatible coding and decoding algorithm is determined according to the capability of the terminal capable of being compatible with coding and decoding. Illustratively, the ability for a terminal to support a downward compatibility of codec algorithms in hardware circuitry, where downward compatibility refers to a terminal having a high priority codec algorithm being compatible with a low priority codec algorithm. The priority of the coding and decoding algorithm is proportional to the capability level of the coding and decoding algorithm, specifically: the higher the priority of the codec algorithm, the higher the capability level of the codec algorithm. For example, several specific codec algorithms are presented herein, among which: the priority ranking order of the coding and decoding algorithm is as follows: FEC < AMR-NB < AMR-WB < EVS, among the four codec algorithms, the EVS codec algorithm has the highest priority and the corresponding codec algorithm has the highest capability level, the FEC codec algorithm has the lowest priority and the corresponding codec algorithm has the lowest capability level.
It should be noted that the relationship between the capability of the codec algorithm and the priority of the codec algorithm is not limited to a direct relationship, and is merely an example, and may also be defined as an inverse relationship in practical applications, and may be specifically set according to actual needs.
The codec algorithm with which the calling terminal or the called terminal can be compatible refers to a codec algorithm that can be used by the calling terminal or the called terminal only after format conversion, wherein: the format conversion here may be a circuit conversion in hardware or an algorithm conversion in software. But the compatibility capability of one terminal is only downward compatible and not upward compatible. Here, the network is taken as an example to illustrate the meaning of the compatibility expression here. For example, for a 4G mobile phone, the network supported by the mobile phone is a 4G network, and the networks compatible with the mobile phone include a 3G network and a 2G network, so that the mobile phone of 4G cannot use the network of 5G because the terminal is only downward compatible. Of course, for a 4G handset to use a 2G or 3G network, it must have a corresponding conversion in hardware or software to make the 4G handset compatible with the 2G or 3G network.
And a sending module 53, configured to send the determined target codec algorithm to the calling terminal and the called terminal, respectively.
Illustratively, the sending module 53 is further configured to forward the first codec list of the calling terminal to the called terminal.
The receiving module 51 is further configured to receive a message of any codec algorithm in the unselected first codec list, which is returned by the called terminal.
Optionally, the determining module 52 is specifically configured to:
and determining a first coding and decoding algorithm from the first coding and decoding list, determining a second coding and decoding algorithm from the second coding and decoding list and the priority sequence of the first coding and decoding algorithm and the second coding and decoding algorithm according to the priority of each coding and decoding algorithm.
And determining a target coding and decoding algorithm from the first coding and decoding algorithm and the second coding and decoding algorithm according to the priority order of the first coding and decoding algorithm and the second coding and decoding algorithm, the coding and decoding algorithm which can be compatible with the calling terminal and the coding and decoding algorithm which can be compatible with the called terminal.
Optionally, the determining module 52 is further specifically configured to:
and selecting a first coding and decoding algorithm from the first coding and decoding list and selecting a second coding and decoding algorithm from the second coding and decoding list according to the priority of each coding and decoding algorithm.
And determining a target coding and decoding algorithm from the first coding and decoding algorithm and the second coding and decoding algorithm according to the coding and decoding algorithm which can be compatible with the calling terminal and the coding and decoding algorithm which can be compatible with the called terminal.
For example, when the determining module 52 determines the target codec algorithm from the first codec algorithm and the second codec algorithm according to the codec algorithm compatible with the calling terminal and the codec algorithm compatible with the called terminal, the determining module is specifically configured to:
and determining the coding and decoding algorithm which can be compatible with the calling terminal and the coding and decoding algorithm which can be compatible with the called terminal.
And determining a target coding and decoding algorithm from the first coding and decoding algorithm and the second coding and decoding algorithm according to the coding and decoding algorithm which can be compatible with the calling terminal and the coding and decoding algorithm which can be compatible with the called terminal.
Optionally, the sending module 53 is further configured to send the target codec algorithm to the mobile switching center-MGW.
When performing codec negotiation, the codec negotiation between the two terminals cannot be realized in the prior art under the condition that the codec sets between the initiator terminal and the receiver terminal do not have an intersection. Compared with the prior art, the device for coding and decoding negotiation provided by the embodiment of the invention can realize coding and decoding negotiation between the initiator terminal and the receiver terminal under the condition that coding and decoding combination between the two terminals does not have intersection. Specifically, the scheme is as follows: receiving a first coding and decoding list reported by a calling terminal and a second coding list reported by a called terminal, wherein the first coding and decoding list consists of coding and decoding algorithms supported by the calling terminal, the second coding and decoding list consists of coding and decoding algorithms supported by the called terminal, and the first coding and decoding list and the second coding and decoding list have no intersection; determining a target coding and decoding algorithm from the first coding and decoding list and the second coding and decoding list according to the priority of each coding and decoding algorithm, the coding and decoding algorithm which can be compatible with the calling terminal and the coding and decoding algorithm which can be compatible with the called terminal, wherein: the terminal compatible coding and decoding algorithm is determined according to the capability of the terminal capable of being compatible with the coding and decoding algorithm; and respectively sending the determined target coding and decoding algorithm to the calling terminal and the called terminal. According to the scheme, the load can be established between the gateway corresponding to the calling terminal and the gateway corresponding to the called terminal, so that normal voice communication can be performed between the calling terminal and the called terminal, and link resources can be saved while the voice communication quality is improved.
A terminal provided in an embodiment of the present invention will be described below based on a related description in an embodiment of a method for codec negotiation corresponding to fig. 3. Technical terms, concepts and the like related to the above embodiments in the following embodiments may refer to the above embodiments, and are not described in detail herein.
An embodiment of the present invention provides a terminal, as shown in fig. 6, where the terminal includes: a sending module 61, a receiving module 62 and an obtaining module 63, wherein:
a sending module 61, configured to report the first codec list or the second codec list to the mobile switching center; the first codec list or the second codec list is composed of codec algorithms supported by the terminal.
For the calling terminal, the sending module 61 is configured to report a first codec list to the mobile switching center, where the first codec list is composed of codec algorithms supported by the calling terminal; for the called terminal, the sending module 61 is configured to report a second codec list to the mobile switching center, where the second codec list is composed of codec algorithms supported by the called terminal.
A receiving module 62, configured to receive a target coding and decoding algorithm issued by a mobile switching center;
the obtaining module 63 is configured to obtain the target codec algorithm from the serving base station of the terminal if the target codec algorithm does not exist in the first codec list or the second codec list.
For example, for the calling terminal, the obtaining module 63 is configured to obtain the target codec algorithm from the serving base station of the calling terminal if the target codec algorithm does not exist in the first codec list; for the called terminal, the obtaining module 63 is configured to obtain the target codec algorithm from the serving base station of the called terminal if the target codec algorithm does not exist in the second codec list.
The sending module 61 is further configured to send the target codec algorithm to the media gateway corresponding to the terminal.
For the calling terminal, the sending module 61 is further configured to send the target codec algorithm to the calling media gateway; for the called terminal, the sending module 61 is further configured to send the target codec algorithm to the called media gateway.
When performing codec negotiation, the codec negotiation between the two terminals cannot be realized in the prior art under the condition that the codec sets between the initiator terminal and the receiver terminal do not have an intersection. Compared with the prior art, the device for coding and decoding negotiation provided by the embodiment of the invention can realize coding and decoding negotiation between the initiator terminal and the receiver terminal under the condition that coding and decoding combination between the two terminals does not have intersection. Specifically, the scheme is as follows: receiving a first coding and decoding list reported by a calling terminal and a second coding list reported by a called terminal, wherein the first coding and decoding list consists of coding and decoding algorithms supported by the calling terminal, the second coding and decoding list consists of coding and decoding algorithms supported by the called terminal, and the first coding and decoding list and the second coding and decoding list have no intersection; determining a target coding and decoding algorithm from the first coding and decoding list and the second coding and decoding list according to the priority of each coding and decoding algorithm, the coding and decoding algorithm which can be compatible with the calling terminal and the coding and decoding algorithm which can be compatible with the called terminal, wherein: the terminal compatible coding and decoding algorithm is determined according to the capability of the terminal capable of being compatible with the coding and decoding algorithm; and respectively sending the determined target coding and decoding algorithm to the calling terminal and the called terminal. According to the scheme, the load can be established between the gateway corresponding to the calling terminal and the gateway corresponding to the called terminal, so that normal voice communication can be performed between the calling terminal and the called terminal, and link resources can be saved while the voice communication quality is improved.
Embodiments of the present invention provide a computer storage medium including computer instructions that, when executed on a computer, cause the computer to perform a method for codec negotiation as described above.
By way of example, computer-readable storage media can be any available media that can be accessed by a computer or a data storage device, such as a server, data center, etc., that includes one or more available media. The usable medium may be a magnetic medium (e.g., floppy Disk, hard Disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., Solid State Disk (SSD)), among others.
Embodiments of the present invention provide a computer program product, which, when running on a computer, causes the computer to execute the method for codec negotiation as described above.
Illustratively, the computer program product described above comprises one or more computer instructions.
Through the above description of the embodiments, it is clear to those skilled in the art that, for convenience and simplicity of description, only the division of the functional modules is illustrated, and in practical applications, the above function distribution may be completed by different functional modules according to needs, that is, the internal structure of the device may be divided into different functional modules to complete all or part of the above described functions. For the specific working processes of the system, the apparatus and the unit described above, reference may be made to the corresponding processes in the foregoing method embodiments, and details are not described here again.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implemented, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A method of codec negotiation, the method comprising:
a mobile switching center receives a first coding and decoding list reported by a calling terminal and a second coding and decoding list reported by a called terminal, wherein the first coding and decoding list consists of coding and decoding algorithms supported by the calling terminal, the second coding and decoding list consists of coding and decoding algorithms supported by the called terminal, and the first coding and decoding list and the second coding and decoding list have no intersection;
determining a target coding and decoding algorithm from the first coding and decoding list and the second coding and decoding list according to the priority of each coding and decoding algorithm, the coding and decoding algorithm which can be compatible with the calling terminal and the coding and decoding algorithm which can be compatible with the called terminal, wherein: the terminal compatible coding and decoding algorithm is determined according to the capability of the terminal capable of being compatible with the coding and decoding algorithm;
respectively sending the determined target coding and decoding algorithm to the calling terminal and the called terminal;
the determining a target codec algorithm from the first codec list and the second codec list according to the priority of each codec algorithm, the codec algorithm compatible with the calling terminal, and the codec algorithm compatible with the called terminal includes:
selecting a first coding and decoding algorithm from the first coding and decoding list and selecting a second coding and decoding algorithm from the second coding and decoding list according to the priority of each coding and decoding algorithm;
and determining a target coding and decoding algorithm from the first coding and decoding algorithm and the second coding and decoding algorithm according to the coding and decoding algorithm which can be compatible with the calling terminal and the coding and decoding algorithm which can be compatible with the called terminal.
2. The method of claim 1, wherein the determining the target codec algorithm from the first codec list and the second codec list according to the priority of each codec algorithm, the codec algorithm compatible with the calling terminal, and the codec algorithm compatible with the called terminal, further comprises:
determining a first coding and decoding algorithm from the first coding and decoding list, determining a second coding and decoding algorithm from a second coding and decoding list and the priority sequence of the first coding and decoding algorithm and the second coding and decoding algorithm according to the priority of each coding and decoding algorithm;
and determining a target coding and decoding algorithm from the first coding and decoding algorithm and the second coding and decoding algorithm according to the priority order of the first coding and decoding algorithm and the second coding and decoding algorithm, the coding and decoding algorithm which can be compatible with the calling terminal and the coding and decoding algorithm which can be compatible with the called terminal.
3. The method according to claim 1 or 2, wherein at least two codec algorithms are included in each of the first codec list and the second codec list, and wherein: each coding and decoding algorithm corresponds to a coding and decoding capability grade and a priority grade, and the higher the capability grade of the coding and decoding algorithm is, the higher the corresponding priority grade is;
the first codec algorithm is a codec algorithm with the highest priority in the first codec list, and/or the second codec algorithm is a codec algorithm with the highest priority in the second codec list.
4. The method according to claim 1, wherein after receiving the first codec list sent by the calling terminal and before receiving the second codec algorithm sent by the called terminal, the method further comprises:
forwarding a first coding and decoding list of the calling terminal to the called terminal;
and receiving a message returned by the called terminal and not selecting any one codec algorithm in the first codec list.
5. A method of codec negotiation, the method comprising:
the terminal reports the first coding and decoding list or the second coding and decoding list to the mobile switching center; the first coding and decoding list or the second coding and decoding list is composed of coding and decoding algorithms supported by the terminal, and the first coding and decoding list and the second coding and decoding list have no intersection;
receiving a target coding and decoding algorithm issued by a mobile switching center, wherein the target coding and decoding algorithm is determined by the mobile switching center from a first coding and decoding algorithm selected from the first coding and decoding list and a second coding and decoding algorithm selected from the second coding and decoding list according to the priority of each coding and decoding algorithm, and is determined from the first coding and decoding algorithm and the second coding and decoding algorithm according to the coding and decoding algorithm which can be compatible with a calling terminal and the coding and decoding algorithm which can be compatible with a called terminal;
if the target coding and decoding algorithm does not exist in the first coding and decoding list or the second coding and decoding list, acquiring the target coding and decoding algorithm from a service base station of the terminal;
and sending the target coding and decoding algorithm to a media gateway corresponding to the terminal.
6. A mobile switching center, the mobile switching center comprising:
the receiving module is used for receiving a first coding and decoding list reported by a calling terminal and a second coding and decoding list reported by a called terminal, wherein the first coding and decoding list consists of coding and decoding algorithms supported by the calling terminal, the second coding and decoding list consists of coding and decoding algorithms supported by the called terminal, and the first coding and decoding list and the second coding and decoding list have no intersection;
a determining module, configured to determine a target codec algorithm from the first codec list and the second codec list according to a priority of each codec algorithm, a codec algorithm that the calling terminal can be compatible with, and a codec algorithm that the called terminal can be compatible with, where: the terminal compatible coding and decoding algorithm is a coding and decoding algorithm determined according to the capability of the terminal capable of being compatible with coding and decoding;
the sending module is used for respectively sending the determined target coding and decoding algorithm to the calling terminal and the called terminal;
the determining module is specifically configured to:
selecting a first coding and decoding algorithm from the first coding and decoding list and selecting a second coding and decoding algorithm from the second coding and decoding list according to the priority of each coding and decoding algorithm;
and determining a target coding and decoding algorithm from the first coding and decoding algorithm and the second coding and decoding algorithm according to the coding and decoding algorithm which can be compatible with the calling terminal and the coding and decoding algorithm which can be compatible with the called terminal.
7. A terminal, characterized in that the terminal comprises:
a sending module, configured to report the first codec list or the second codec list to the mobile switching center; the first coding and decoding list or the second coding and decoding list is composed of coding and decoding algorithms supported by the terminal, and the first coding and decoding list and the second coding and decoding list have no intersection;
the receiving module is used for receiving a target coding and decoding algorithm issued by the mobile switching center;
an obtaining module, configured to obtain the target codec algorithm from a serving base station of the terminal if the target codec algorithm does not exist in the first codec list or the second codec list, where the target codec algorithm is determined by the mobile switching center from a first codec list according to a priority of each codec algorithm, from a second codec list according to a second codec algorithm selected by the mobile switching center from the first codec list, and from the first codec algorithm and the second codec algorithm according to a codec algorithm compatible with the calling terminal and a codec algorithm compatible with the called terminal;
and the sending module is also used for sending the target coding and decoding algorithm to the media gateway corresponding to the terminal.
8. A computer storage medium comprising computer instructions which, when run on a computer, cause the computer to perform a method of codec negotiation as claimed in any one of claims 1-4 or claim 5.
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| CN109714750B (en) * | 2018-12-18 | 2020-12-22 | Oppo广东移动通信有限公司 | Call method, device, electronic terminal and medium |
| WO2023184383A1 (en) * | 2022-03-31 | 2023-10-05 | 北京小米移动软件有限公司 | Capability determination method and apparatus, and capability reporting method and apparatus, and device and storage medium |
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