CN106791241B

CN106791241B - Coding and decoding negotiation method and call controller

Info

Publication number: CN106791241B
Application number: CN201611131350.7A
Authority: CN
Inventors: 陈璇; 葛瑾; 童磊; 任驰; 赵雨田
Original assignee: China United Network Communications Group Co Ltd
Current assignee: China United Network Communications Group Co Ltd
Priority date: 2016-12-09
Filing date: 2016-12-09
Publication date: 2020-03-03
Anticipated expiration: 2036-12-09
Also published as: CN106791241A

Abstract

The application provides a coding and decoding negotiation method and a call controller, which relate to the field of communication and can ensure that a voice coding and decoding capability finally negotiated by a calling party and a called party contains a target coding and decoding mode in a centralized manner and carry out voice service based on the target coding and decoding mode. The method comprises the following steps: a called terminal call controller acquires a calling encoding and decoding capability set and a called encoding and decoding capability set; at least one of the calling codec capability set and the called codec capability set comprises target codec capability information; the called terminal call controller determines a voice service coding and decoding capability set according to the calling coding and decoding capability set and the called coding and decoding capability set; the voice service coding and decoding capability set comprises target coding and decoding capability information, so that the called terminal call controller and/or the calling terminal call controller can determine a target media gateway according to the target coding and decoding capability information and utilize the target media gateway to carry the voice service between the calling terminal and the called terminal.

Description

Coding and decoding negotiation method and call controller

Technical Field

The present invention relates to the field of communications, and in particular, to a method for codec negotiation and a call controller.

Background

With the introduction and development of VOLTE (Voice over Long Term Evolution) networks, high definition Voice services gradually enter the sight of people. The high-definition voice adopts a coding mode, and can provide a better MOS (Mean Opinion Score) value than the traditional voice coding and decoding mode, so that the user experience is better. Therefore, the selection of high-quality voice encoding and decoding technology and equipment is an important guarantee for the voice service quality.

In the existing network structure, a Mobile Switching Center (MSC) server is configured to hang a plurality of Media GateWay (MGWs) below, and based on the network structure, voice codec negotiation is performed in a voice service establishment process through the following processes: a calling terminal initiates a call request message for paging a called terminal, wherein the message carries voice coding and decoding capability information supported by the calling terminal; the MSC server of the calling end receives the call request message, acquires the voice coding and decoding capacity information therein, removes the coding and decoding information which is not supported by the MSC server, generates new coding and decoding capacity information, and sends the information to the MSC server of the called end; the MSC server of the called end receives the new coding and decoding capability information, removes coding and decoding information which is not supported by the MSC server, determines coding and decoding capability information which is finally used for establishing voice service, and replies the determined coding and decoding capability information to the MSC server of the calling end; and finally, the MSC server of the calling terminal and the MSC server of the called terminal establish voice bearing between the calling terminal and the called terminal according to the finally determined coding and decoding capability information.

Therefore, in the prior art, when negotiating the voice encoding and decoding capability, the network element through which the voice request information passes will remove the encoding and decoding modes that are not supported by the network element. Thus, for a certain type of codec (e.g., high definition voice codec), as long as there is a network element that does not support such codec in the end-to-end network element (i.e., the network element through which the voice request information passes), the codec will be removed when the voice request information for establishing the voice service passes through the network element, which results in that the finally negotiated voice codec capability does not always include such codec. The voice service cannot be performed based on the expected encoding and decoding mode, so that the MOS value of the voice service is low, and the user experience is not good.

Disclosure of Invention

The invention provides a coding and decoding negotiation method and a call controller, when an end-to-end device supports a certain coding and decoding mode, the voice coding and decoding capabilities finally negotiated by a calling terminal and a called terminal collectively comprise the coding and decoding mode, and voice service can be carried out based on the coding and decoding mode, the MOS value of the voice service is improved, and the user experience is optimized.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

in a first aspect, a codec negotiation method is disclosed, including:

a called terminal call controller acquires a calling encoding and decoding capability set and a called encoding and decoding capability set; at least one of the calling codec capability set and the called codec capability set comprises target codec capability information;

the called terminal call controller determines a voice service coding and decoding capability set according to the calling coding and decoding capability set and the called coding and decoding capability set; the voice service coding and decoding capability set comprises the target coding and decoding capability information, so that the called terminal call controller and/or the calling terminal call controller can determine a target media gateway according to the target coding and decoding capability information and utilize the target media gateway to carry the voice service between the calling terminal and the called terminal.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the obtaining, by the called-side call controller, a called codec capability set specifically includes:

determining a called terminal media gateway coding and decoding capability set according to the coding and decoding capability information of the called terminal media gateway, determining a called terminal wireless coding and decoding capability set according to the called terminal wireless coding and decoding capability information, and determining a called terminal coding and decoding capability set according to the coding and decoding capability information of the called terminal;

and determining the called encoding and decoding capability according to the called end media gateway encoding and decoding capability set, the called end wireless encoding and decoding capability set and the called terminal encoding and decoding capability set.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the determining the called codec capability set according to the called-side media gateway codec capability set, the called-side wireless codec capability set, and the called-side terminal codec capability set specifically includes:

determining the intersection of the called terminal media gateway coding and decoding capability set, the called terminal wireless coding and decoding capability set and the called terminal coding and decoding capability set;

if the intersection of the called terminal media gateway coding and decoding capability set, the called terminal wireless coding and decoding capability set and the called terminal coding and decoding capability set is an empty set, generating the called terminal coding and decoding capability set according to the target coding and decoding capability information in the called terminal wireless coding and decoding capability set when the called terminal wireless coding and decoding capability set is determined to contain the target coding and decoding capability information;

if the intersection of the called end media gateway coding and decoding capability set, the called end wireless coding and decoding capability set and the called terminal coding and decoding capability set is a non-empty set, judging whether the called end media gateway coding and decoding capability set contains the target coding and decoding information, and if the called end media gateway coding and decoding capability set contains the target coding and decoding information, generating the called coding and decoding capability set according to the target coding and decoding capability information in the called end media gateway coding and decoding capability set; and if the called end media gateway coding and decoding capability set does not contain the target coding and decoding information, determining the called end media gateway coding and decoding capability set as the called coding and decoding capability set.

With reference to the first possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect,

then, the determining the called codec capability set according to the called end media gateway codec capability set, the called end wireless codec capability set, and the called terminal codec capability set specifically includes:

determining a first set, wherein the first set is an intersection of the called terminal media gateway coding and decoding capability set, the called terminal wireless coding and decoding capability set and the called terminal coding and decoding capability set;

if the called end media gateway coding and decoding capability set comprises the target coding and decoding capability information, generating a target coding and decoding capability set according to the target coding and decoding capability information contained in the called end media gateway coding and decoding capability set;

determining an intersection of the first set and the target codec capability set;

if the intersection of the first set and the target coding and decoding capability set is an empty set, determining that the target coding and decoding capability set is the calling coding and decoding capability set;

and if the intersection of the first set and the target coding and decoding capability set is a non-empty set, determining that the intersection of the first set and the target coding and decoding capability set is the calling coding and decoding capability set.

With reference to the first aspect or any one of the first to third possible implementation manners of the first aspect, in a fourth possible implementation manner of the first aspect, the determining, by the called-end call controller, the voice service codec capability set according to the calling codec capability set and the called codec capability set specifically includes:

determining the intersection of the calling codec capability set and the called codec capability set;

if the intersection of the calling encoding and decoding capability set and the called encoding and decoding capability set is an empty set, determining that the voice service encoding and decoding capability set comprises the calling encoding and decoding capability set and the called encoding and decoding capability;

and if the intersection of the calling encoding and decoding capability set and the called encoding and decoding capability set is a non-empty set, determining that the voice service encoding and decoding capability set is the intersection of the calling encoding and decoding capability set and the called encoding and decoding capability set.

In a second aspect, a codec negotiation method is disclosed, which includes:

a calling terminal call controller determines a calling encoding and decoding capability set;

the calling terminal call controller sends the calling encoding and decoding capability set to the called terminal call controller, so that the called terminal call controller determines a voice service encoding and decoding capability set according to the calling encoding and decoding capability set and the called encoding and decoding capability set; the voice service coding and decoding capability set comprises the target coding and decoding capability information, and at least one of the calling coding and decoding capability set and the called coding and decoding capability set comprises the target coding and decoding capability information;

and the calling terminal call controller receives the voice service coding and decoding capability set sent by the called terminal call controller.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the determining, by the calling side call controller, the calling codec capability set specifically includes:

determining a calling terminal media gateway coding and decoding capability set according to the coding and decoding capability information of the calling terminal media gateway, determining a calling terminal wireless coding and decoding capability set according to the calling terminal wireless coding and decoding capability information, and determining a calling terminal coding and decoding capability set according to the coding and decoding capability information of the calling terminal;

and determining the called encoding and decoding capability according to the calling terminal media gateway encoding and decoding capability set, the calling terminal wireless encoding and decoding capability set and the calling terminal encoding and decoding capability set.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the determining the called codec capability according to the media gateway codec capability set of the calling end, the wireless codec capability set of the calling end, and the codec capability set of the calling terminal specifically includes:

determining the intersection of the calling terminal media gateway coding and decoding capability set, the calling terminal wireless coding and decoding capability set and the calling terminal coding and decoding capability set;

if the intersection of the calling terminal media gateway coding and decoding capability set, the calling terminal wireless coding and decoding capability set and the calling terminal coding and decoding capability set is an empty set, when the calling terminal wireless coding and decoding capability set is determined to contain the target coding and decoding capability information, generating the calling terminal coding and decoding capability set according to the target coding and decoding capability information in the calling terminal wireless coding and decoding capability set;

if the intersection of the calling end media gateway coding and decoding capability set, the calling end wireless coding and decoding capability set and the calling terminal coding and decoding capability set is a non-empty set, judging whether the calling end media gateway coding and decoding capability set contains the target coding and decoding information, and if the calling end media gateway coding and decoding capability set contains the target coding and decoding information, generating the calling end coding and decoding capability set according to the target coding and decoding capability information in the calling end media gateway coding and decoding capability set; and if the coding and decoding capability set of the media gateway of the calling terminal does not contain the target coding and decoding information, determining the coding and decoding capability set of the media gateway of the calling terminal as the coding and decoding capability set of the calling terminal.

With reference to the first possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect,

then, the determining the calling codec capability set according to the calling terminal media gateway codec capability set, the calling terminal wireless codec capability set, and the calling terminal codec capability set specifically includes:

determining a second set, wherein the second set is an intersection of the calling terminal media gateway codec capability set, the calling terminal wireless codec capability set and the calling terminal codec capability set;

if the calling end media gateway coding and decoding capability set comprises the target coding and decoding capability information, generating a target coding and decoding capability set according to the target coding and decoding capability information contained in the calling end media gateway coding and decoding capability set;

determining an intersection of the second set and the target codec capability set;

if the intersection of the second set and the target coding and decoding capability set is an empty set, determining that the target coding and decoding capability set is the calling coding and decoding capability set;

and if the intersection of the second set and the target coding and decoding capability set is a non-empty set, determining that the intersection of the second set and the target coding and decoding capability set is the calling coding and decoding capability set.

In a third aspect, a called-side call controller is disclosed, which includes:

the acquiring unit is used for acquiring a calling encoding and decoding capability set and a called encoding and decoding capability set; at least one of the calling codec capability set and the called codec capability set comprises target codec capability information;

a determining unit, configured to determine a voice service codec capability set according to the calling codec capability set and the called codec capability set; the voice service coding and decoding capability set comprises the target coding and decoding capability information, so that the called terminal call controller and/or the calling terminal call controller can determine a target media gateway according to the target coding and decoding capability information and utilize the target media gateway to carry the voice service between the calling terminal and the called terminal.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the obtaining unit is specifically configured to,

and determining the called encoding and decoding capability according to the called end media gateway encoding and decoding capability set, the called end wireless encoding and decoding capability set and the called terminal encoding and decoding capability set. At least one of the calling terminal wireless coding and decoding capability set, the calling terminal media gateway coding and decoding capability set, the calling terminal coding and decoding capability set, the called terminal wireless coding and decoding capability set, the called terminal media gateway coding and decoding capability set and the called terminal coding and decoding capability set comprises the target coding and decoding capability information.

With reference to the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the obtaining unit is specifically configured to determine an intersection of the called-end media gateway codec capability set, the called-end wireless codec capability set, and the called-end codec capability set;

With reference to the first possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect, the obtaining unit is further configured to,

With reference to the third aspect or any one of the first to third possible implementation manners of the third aspect, in a fourth possible implementation manner of the third aspect, the determining unit is configured to determine an intersection of the calling codec capability set and the called codec capability set;

In a fourth aspect, a calling side call controller is disclosed, comprising:

a determining unit, configured to determine a calling codec capability set;

a sending unit, configured to send the calling codec capability set to the called-side call controller, so that the called-side call controller determines a voice service codec capability set according to the calling codec capability set and the called codec capability set; the voice service coding and decoding capability set comprises the target coding and decoding capability information, and at least one of the calling coding and decoding capability set and the called coding and decoding capability set comprises the target coding and decoding capability information;

and the receiving unit is used for receiving the voice service coding and decoding capability set sent by the called terminal call controller.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the determining unit is specifically configured to determine an encoding and decoding capability set of the media gateway of the calling end according to the encoding and decoding capability information of the media gateway of the calling end, determine a wireless encoding and decoding capability set of the calling end according to the wireless encoding and decoding capability information of the calling end, and determine an encoding and decoding capability set of the calling terminal according to the encoding and decoding capability information of the calling terminal;

With reference to the first possible implementation manner of the fourth aspect, in a second possible implementation manner of the fourth aspect, the determining unit is specifically configured to determine an intersection of the media gateway codec capability set of the calling end, the wireless codec capability set of the calling end, and the codec capability set of the calling terminal;

With reference to the first possible implementation manner of the fourth aspect, in a third possible implementation manner of the fourth aspect, the determining unit is specifically configured to determine a second set, where the second set is an intersection of the media gateway codec capability set of the calling end, the wireless codec capability set of the calling end, and the codec capability set of the calling terminal;

The coding and decoding negotiation method and the call controller provided by the embodiment of the invention firstly carry out the negotiation of the calling and called coding and decoding capability sets to obtain the calling coding and decoding capability set and the called coding and decoding capability set, wherein at least one of the two sets comprises the target coding and decoding capability information. And then the voice service coding and decoding capability set determined according to the calling coding and decoding capability set and the called coding and decoding capability set also comprises target coding and decoding capability information, a calling terminal target media gateway and a called terminal target media gateway are determined according to the voice service coding and decoding capability set, and then voice service between calling and called can be carried out through the calling terminal target media gateway and the called terminal target media gateway based on the target coding and decoding capability information. Therefore, the voice coding and decoding capability finally negotiated by the calling party and the called party centrally comprises the target coding and decoding mode, the voice service can be carried out based on the target coding and decoding mode, the MOS value of the voice service is improved, and the user experience is optimized.

Drawings

Fig. 1 is a diagram of a conventional mobile network architecture;

fig. 2 is a flowchart illustrating a codec negotiation method according to an embodiment of the present invention;

fig. 3 is a flowchart illustrating a home terminal codec negotiation method according to an embodiment of the present invention;

fig. 4 is a diagram of another conventional mobile network architecture;

fig. 5 is another flowchart illustrating a codec negotiation method according to an embodiment of the present invention;

fig. 6 is a block diagram of a called call controller according to an embodiment of the present invention;

fig. 7 is a block diagram of a calling call controller according to an embodiment of the present invention.

Detailed Description

Fig. 1 shows a conventional mobile network architecture. In order to better provide voice service, one MSC server hangs down a plurality of MGWs. The network architecture shown in fig. 1 is used to implement an intra-office call, that is, a calling terminal and a called terminal belong to the same MSC server. The MGW under the MSC server includes a calling end media gateway (e.g. MGW1, MGW2, MGW3 in fig. 1) and a called end media gateway (e.g. MGW4, MGW5 in fig. 1). The calling end media gateway and the called end media gateway are respectively connected with an RNC (ran network control), wherein the RNC which is hung down by the calling end media gateway is the calling end RNC, and the RNC which is hung down by the called end media gateway is the called end RNC.

In order to provide high-quality voice service, the calling and called terminals first need to perform voice codec negotiation through the MSC server during the voice service establishment process. Then, a radio bearer between the calling terminal and the calling RNC (e.g. RNC1) is established, a core network bearer between the calling RNC and the calling end media gateway (e.g. MGW1) is established, a connection between the calling end media gateway and the called end media gateway (e.g. MGW4) is established, a core network bearer between the called end media gateway and the called RNC (e.g. RNC4) is established, and a radio bearer between the called RNC and the called terminal is established.

The conventional voice codec negotiation process is described below by taking the intra-office call network architecture shown in fig. 1 as an example:

1. the mobile terminal A sends a Setup message to the MSC server, the message is used for initiating a voice call to the mobile terminal B, and the mobile terminal A carries the voice coding and decoding capability information supported by the mobile terminal A in the Setup message.

2, the MSC server receives the Setup message of the mobile terminal A, and removes the coding and decoding modes which are not supported by the Setup message by referring to the pre-configured coding and decoding capability information. And determining the coding and decoding capability set and the MGW (namely the MGW at the calling end) adopted by the call. Similarly, the MSC server receives the Call configured signaling message of the mobile terminal B, and removes the coding and decoding modes which are not supported by the Call configured signaling message by referring to the pre-configured coding and decoding capability information. And determining the coding and decoding capability set and MGW (called terminal MGW) adopted by the call.

3. The calling and called terminals (mobile terminal A, mobile terminal B) carry out coding and decoding negotiation in a Trfo mode, namely, in an IAM request/APM response mode, the coding and decoding mode which is not supported in an IAM message is removed, and then the mode is continuously transmitted to other gateways.

In summary, the Trfo mode is adopted to perform codec mode negotiation, and once an end-to-end network element (each device through which a voice request passes in the process of establishing a voice service between a calling terminal and a called terminal) has a device that does not support a certain type of codec mode (such as a high-definition voice codec mode), the finally negotiated codec mode always does not include the codec mode. To perform voice services based on a certain codec, each end-to-end device needs to support the codec. For example, to improve voice quality based on high-definition voice technology, each end-to-end device needs to support high-definition voice codec. However, in the existing network, the coding and decoding capabilities of each device cannot be limited, for example, it cannot be ensured that MGWs selected by the MSC server all support high-definition voice coding and decoding, thereby affecting the quality of voice services.

The principle of the embodiment of the invention is that the expected coding and decoding modes are preferentially reserved when the coding and decoding negotiation is carried out by utilizing the existing coding and decoding capability data of the end-to-end network elements of the calling party and the called party, so that the finally negotiated coding and decoding capability set at least comprises the expected coding and decoding modes, and then the proper MGW is selected according to the finally negotiated coding and decoding capability set, so that the voice service can be carried out based on the coding and decoding. The method is not limited to the coding and decoding capability of a single device, and provides effective voice quality improvement for users.

Example 1:

an embodiment of the present invention provides a method for negotiating encoding and decoding, which is applied to a network architecture diagram shown in fig. 1, and as shown in fig. 2, the method includes the following steps:

101. a call controller receives a call request message of a calling terminal; and the calling request message carries the coding and decoding capability information of the calling party.

Here, when the calling terminal pages the called terminal, the calling request message is first sent to the call controller, and the call controller processes and forwards the call request message. Wherein the call controller may be an MSC server and the call request message may be a Setup message. In addition, the codec capability information of the calling party, i.e. the codec information supported by the calling terminal.

102. A calling controller acquires a calling encoding and decoding capability set and a called encoding and decoding capability set; at least one of the calling codec capability set and the called codec capability set includes target codec capability information.

In specific implementation, the call controller determines the codec capability set of the media gateway of the calling terminal according to the codec capability information of the media gateway of the calling terminal, determines the wireless codec capability set of the calling terminal according to the wireless codec capability information of the calling terminal (set by the MSC server and used for establishing a wireless bearer between the calling terminal and the calling RNC), and determines the codec capability set of the calling terminal according to the codec capability information of the calling terminal. And then, determining the calling encoding and decoding capability set according to the calling terminal media gateway encoding and decoding capability set, the calling terminal wireless encoding and decoding capability set and the calling terminal encoding and decoding capability set.

In addition, the method determines the codec capability set of the called end media gateway according to the codec capability information of the called end media gateway, determines the wireless codec capability set of the called end according to the wireless codec capability information of the called end (set by the MSC server and used for establishing wireless bearing between the called terminal and the called RNC), and determines the codec capability set of the called terminal according to the codec capability information of the called terminal. And then determining the called encoding and decoding capability according to the called end media gateway encoding and decoding capability set, the called end wireless encoding and decoding capability set and the called terminal encoding and decoding capability set.

It should be noted that at least one of the media gateway codec capability set of the calling terminal, the wireless codec capability set of the calling terminal, the media gateway codec capability set of the called terminal, the wireless codec capability set of the called terminal, and the codec capability set of the called terminal includes the target codec capability information.

103. The calling controller determines a voice service coding and decoding capability set according to the calling coding and decoding capability set and the called coding and decoding capability set; the voice service coding and decoding capability set comprises the target coding and decoding capability information.

That is to say, after determining the codec capability sets of the calling party and the called party, a codec capability set finally used for establishing a voice service, that is, the voice service codec capability set, needs to be negotiated according to the codec capability sets of the calling party and the called party.

Specifically, the intersection of the calling codec capability set and the called codec capability set is determined. Preferably, the intersection of the first 16 sets of capability information in the calling codec capability set and the called codec capability set is determined here.

And if the intersection is an empty set, determining that the voice service coding and decoding capability set comprises the calling coding and decoding capability set and the called coding and decoding capability.

And if the intersection is a non-empty set, determining the voice service coding and decoding capacity set as the intersection.

In the embodiment of the invention, when the calling terminal and the called terminal have a mode supporting the target coding and decoding, the voice service can be finally carried out based on the target coding and decoding mode. Specifically, if the codec capability sets of the calling party and the called party both include the target codec capability information, then the intersection of the codec capability sets of the calling party and the called party also includes the target codec capability information, and then the voice bearer between the calling party and the called party can be established based on the target codec manner. And if the intersection of the coding and decoding capability sets of the calling party and the called party does not contain high-definition voice coding and decoding, the coding and decoding capability information in the intersection is used for carrying out the voice service of the calling party and the called party. The intersection of the codec capability sets of the calling party and the called party is an empty set, and the calling party and the called party determine the media gateway, establish the wireless bearer and the core network bearer by using the respective codec capability sets. Of course, if the codec capability of the calling party and the called party is concentrated with the target codec capability information, the party with the target codec capability information establishes the radio bearer based on the target codec capability information.

104. And the call controller determines a target media gateway according to the voice service coding and decoding capability set and utilizes the target media gateway to carry the voice service between the calling party and the called party.

In particular, the call controller determines the target media gateway, i.e. for establishing a core network bearer with the RNC. The media gateway for bearing the calling and called voice services comprises a calling end target media gateway and a called end media gateway.

The method for determining the target media gateway of the calling terminal by the call controller specifically comprises the following steps:

and judging whether the intersection of the voice service coding and decoding capability set and the calling coding and decoding capability set is an empty set.

If the intersection of the voice service coding and decoding capability set and the calling party coding and decoding capability set is a non-empty set, determining a calling party target media gateway according to the voice service coding and decoding capability set, and establishing a radio bearer between a calling terminal and a calling RNC (namely a calling party radio bearer) and a core network bearer between the calling RNC and the calling party target media gateway (namely a calling party core network bearer); and if the intersection of the voice service coding and decoding capability set and the calling party coding and decoding capability set is an empty set, judging whether the calling party media gateway supports the voice service coding and decoding.

If the calling end media gateway supports the voice service coding and decoding, determining a calling end target media gateway according to the voice service coding and decoding capability set and establishing a calling end core network bearer, and establishing a calling end wireless bearer according to the calling end media gateway coding and decoding capability set; if the calling end media gateway does not support the voice service coding and decoding, judging whether the intersection of the coding and decoding capability set of the calling end media gateway and the coding and decoding capability set of the voice service is an empty set.

If the intersection of the encoding and decoding capability set of the media gateway of the calling end and the encoding and decoding capability set of the voice service is a non-empty set, determining a target media gateway of the calling end according to the wireless encoding and decoding capability set of the calling end and establishing a core network bearer of the calling end, and establishing a wireless bearer of the calling end according to the encoding and decoding capability set of the voice service.

In addition, the call controller determining the target media gateway of the called terminal specifically includes:

judging whether the intersection of the voice service coding and decoding capability set and the called coding and decoding capability set is an empty set;

if the intersection of the voice service coding and decoding capability set and the called coding and decoding capability set is a non-empty set, determining a called end target media gateway according to the voice service coding and decoding capability set and establishing a called end core network bearer (the called RNC and the core network bearer of the called end target media gateway) and a called end wireless bearer (the called terminal and the wireless bearer of the called RNC); if the intersection of the voice service coding and decoding capability set and the called coding and decoding capability set is an empty set, judging whether the called end media gateway supports the voice service coding and decoding;

if the called end media gateway supports the voice service coding and decoding, determining a called end target media gateway according to the voice service coding and decoding capability set and establishing a called end core network bearer, and establishing a called end wireless bearer according to the called end media gateway coding and decoding capability set; if the called end media gateway does not support the voice service coding and decoding, judging whether the intersection of the called end media gateway coding and decoding capacity set and the voice service coding and decoding capacity set is an empty set.

If the intersection of the called terminal media gateway coding and decoding capability set and the voice service coding and decoding capability set is a non-empty set, determining a called terminal target media gateway according to the called terminal wireless coding and decoding capability set and establishing a called terminal core network bearer, and establishing a called terminal wireless bearer according to the voice service coding and decoding capability set.

As shown in fig. 3, an embodiment of the present invention further provides a home codec negotiation method (taking the target codec capability information as the high-definition speech codec capability information as an example), and a call controller may obtain a calling codec capability set and a called codec capability set according to the method steps shown in fig. 3. The method specifically comprises the following steps:

201. and acquiring a local terminal MGW coding and decoding capability set W.

The home terminal in this embodiment refers to the calling terminal. Furthermore, the MGW codec capability set W at the home terminal is the codec capability set of the media gateway at the calling terminal according to the embodiment of the present invention.

In a specific implementation, a call controller (MSC server) collects codec capability information of each MGW (including a calling MGW and a called MGW) that is connected to the MSC server, generates a codec capability set W0, W1, … … Wn (where n is a number of MGW), extracts information, and generates a MGW capability set, the MSC server further generates a home MGW codec capability set W (W is ∪ { W0, W1, … … Wn }, i.e., a union of the codec capability sets of each MGW) according to the codec capability set of each MGW, and a field format of the MGW capability set W0 may be as shown in table 1.

TABLE 1

In table 1, the ID and name of the MGW and information of various codec capabilities and codec capabilities supported by the MGW are given, and for example, a field description of whether the field name "supports UMTS AMR-WB" may be used to describe whether the MGW supports "UMTS AMR-WB", and if so, the support is verified. The field name "codec rate supported by UMTS AMR-WB", which indicates the supported codec rate mode, may be exemplified by "(0) - (5)".

Then, the MSC server arranges the coding and decoding capability information in the coding and decoding capability of each MGW according to the order of the priority from high to low, and finally, a union set is taken to obtain a home terminal MGW coding and decoding capability set W.

Table 2 gives one possible codec prioritization order:

TABLE 2

It should be noted that "Configuration" in table 1 represents the modes of speech codec, and each mode corresponds to a set of codec capability information (i.e. rate capability of codec).

In addition, table 3 shows a possible implementation manner of the MGW codec capability set W.

TABLE 3

In addition, since only 16 sets of codecs can be carried between stations, 17 sets of codecs and beyond are dropped during this negotiation. Preferably, the high-definition speech codec capability information in table 1 may be extracted to generate the set R. So that in step 210, it is determined whether the intersection of V and R is an empty set.

Table 4 gives one possible implementation of R, specifically as follows:

TABLE 4

202. The call controller judges whether the MGW coding and decoding capability set W at the local end comprises high-definition voice coding and decoding capability information.

If yes, go to step 203; if not, go to step 204.

203. And reserving high-definition voice coding and decoding capacity information in the MGW coding and decoding capacity set W of the home terminal, and generating a high-definition voice coding and decoding capacity set R according to the high-definition voice coding and decoding capacity information.

Specifically, a 2G high-definition speech codec capability set R2 and a 3G high-definition speech codec capability set R3 are generated, respectively.

204. And (3) local terminal coding and decoding negotiation (determining X as { P ∩ Q ∩ W }).

Wherein, P is the codec capability set of the calling terminal (i.e. the codec capability set of the calling terminal according to the embodiment of the present invention), Q is the wireless codec capability set of the calling terminal according to the embodiment of the present invention, and represents the wireless codec capability information of the calling terminal RNC and BSC, determined according to the codec capability preconfigured by the MSC server. The intersection of P and Q is used to establish the radio bearer between the calling terminal and the calling RNC (i.e. the calling-end infinite bearer), and if the intersection is an empty set, the radio bearer between the calling terminal and the calling RNC is established by Q. P, Q, W is used to establish the core network bearer between the calling RNC and the calling MGW (i.e. the calling end core network bearer), and if the intersection is empty, W is used to establish the core network bearer between the calling RNC and the calling MGW. In a specific implementation, the MSC server may determine according to the call request information (setup message) reported by the calling party or according to the call confirmation message (call confirmed signaling) reported by the called party.

205. And judging whether the local end codes and the local end codes are consistent (whether X is an empty set).

If X is the empty set, that is, the local end coding and decoding negotiation is not consistent, go to step 206; if X is a non-empty set, proceed to step 209.

206. And judging whether the wireless coding and decoding capability set Q contains high-definition voice coding and decoding capability information.

If yes, go to step 207; if not, proceed to step 208.

207. And extracting a high-definition voice coding and decoding capability set O in the Q, and determining that the O is a local terminal coding and decoding capability set.

Here, the home codec capability set is the calling codec capability set. In addition, the priority of the high-definition voice coding and decoding capability set O in P is higher than that of the home terminal MGW coding and decoding capability set W.

208. The wireless/core network respectively adopts respective coding and decoding capability sets.

Specifically, the calling terminal establishes a radio bearer with the calling RNC by using Q, and the calling RNC establishes a core network bearer with the calling MGW by using W.

209. And judging whether the X contains high-definition voice coding and decoding capability information.

And if the X does not contain the high-definition voice coding and decoding capability information, the local terminal coding and decoding capability set is X. If X includes the high-definition speech codec capability information, go to step 210.

210. And extracting a high-definition voice coding and decoding capability information set V in the X, and judging whether the intersection of the V and the R is an empty set.

If the intersection of V and R is an empty set, go to step 211; if the intersection of V and R is not an empty set, proceed to step 212.

211. And determining R as a local end coding and decoding capability set.

212. And determining the intersection of the V and the R as a local-end encoding and decoding capability set.

It should be noted that the call controller may also determine the called codec capability set according to the flow shown in fig. 3. Different from the flow shown in fig. 3, in the above embodiment, the home terminal in steps 201 to 212 is a called terminal, and W is a called terminal media gateway codec capability set determined according to called terminal MGW codec capability information; and P is a called terminal coding and decoding capability set and is determined according to a Call confirmed message (Call confirmed signaling) reported by a called party. Q is a called terminal wireless coding and decoding capability set, and is determined according to the coding and decoding capability pre-configured by the MSC server.

There may also be an interoffice call between the caller and the called, i.e. the caller and the called belong to different MSC servers. The network architecture is shown in fig. 4, where MSC server a is the MSC server of the calling end, MSC server B is the MSC server of the called end, MGWs hung under MSC server a are the media gateways of the calling end (such as MGW1, MGW2, MGW3 in fig. 4), and MGWs hung under MSC server B are the media gateways of the called end (such as MGW4, MGW5 in fig. 4).

Based on the network architecture shown in fig. 4, an embodiment of the present invention provides another codec negotiation method, as shown in fig. 5, where the method includes the following steps:

301. a calling terminal call controller (MSC server A) receives a calling request message of a calling party; and the calling request message carries the coding and decoding capability information of the calling party.

Based on the network architecture shown in fig. 4, when a caller pages a called party, a call request message is first sent to the calling side call controller, and the calling side call controller processes and forwards the call request message. Wherein, the calling end call controller may send a message, which may be an MSC server, and the call request message may be a setup message. In addition, the codec capability information of the calling party, i.e. the codec information supported by the calling terminal.

302. And the calling terminal call controller acquires the calling codec capability set and sends the calling codec capability set to the called terminal call controller.

In the specific implementation, the calling terminal call controller determines a calling terminal media gateway coding and decoding capability set according to the coding and decoding capability information of the calling terminal media gateway, determines a calling terminal wireless coding and decoding capability set according to the calling terminal wireless coding and decoding capability information, and determines a calling terminal coding and decoding capability set according to the coding and decoding capability information of the calling terminal. And then, determining the calling encoding and decoding capability set according to the calling terminal media gateway encoding and decoding capability set, the calling terminal wireless encoding and decoding capability set and the calling terminal encoding and decoding capability set.

303. The called terminal call controller acquires a called codec capability set.

Specifically, the called terminal call controller determines a called terminal media gateway coding and decoding capability set according to the coding and decoding capability information of the called terminal media gateway, determines a called terminal wireless coding and decoding capability set according to the called terminal coding and decoding capability information, and determines a called terminal coding and decoding capability set according to the coding and decoding capability information of the called terminal. And then determining the called encoding and decoding capability according to the called end media gateway encoding and decoding capability set, the called end wireless encoding and decoding capability set and the called terminal encoding and decoding capability set.

It should be noted that, at least one of the media gateway codec capability set of the calling terminal, the wireless codec capability set of the calling terminal, the media gateway codec capability set of the called terminal, the wireless codec capability set of the called terminal, and the codec capability set of the called terminal includes the target codec capability information.

304. And the called terminal call controller determines a voice service coding and decoding capability set according to the calling coding and decoding capability set and the called coding and decoding capability set.

If the intersection is an empty set, determining that the voice service coding and decoding capability set comprises the calling coding and decoding capability set and the called coding and decoding capability;

305. And the called terminal call controller sends the voice service coding and decoding capability set to the calling terminal call controller.

306. And the calling terminal call controller and the called terminal call controller respectively determine a target media gateway according to the voice service coding and decoding capability set, and bear the voice service between the calling party and the called party by utilizing the target media gateway.

Specifically, the determining, by the calling-side call controller, a media gateway used by the calling side to establish a voice session, that is, the calling-side target media gateway, includes:

If the intersection of the voice service coding and decoding capability set and the calling party coding and decoding capability set is a non-empty set, determining a calling party target media gateway according to the voice service coding and decoding capability set and establishing a calling party core network bearer and a calling party radio bearer; and if the intersection of the voice service coding and decoding capability set and the calling party coding and decoding capability set is an empty set, judging whether the calling party media gateway supports the voice service coding and decoding.

If the calling end media gateway supports the voice service coding and decoding, determining a calling end target media gateway according to the voice service coding and decoding capability set and establishing a core network bearer, and establishing a wireless bearer according to the calling end media gateway coding and decoding capability set; if the calling end media gateway does not support the voice service coding and decoding, judging whether the intersection of the coding and decoding capability set of the calling end media gateway and the coding and decoding capability set of the voice service is an empty set.

If the intersection of the encoding and decoding capability set of the media gateway of the calling end and the encoding and decoding capability set of the voice service is a non-empty set, determining the first type of target media gateway according to the wireless encoding and decoding capability set of the calling end and establishing a core network bearer of the calling end, and establishing a wireless bearer of the calling end according to the encoding and decoding capability set of the voice service.

In addition, the called terminal call controller determining a media gateway used by the called terminal for establishing a voice session, namely the called terminal target media gateway, includes:

if the intersection of the voice service coding and decoding capability set and the called coding and decoding capability set is a non-empty set, determining a called end target media gateway according to the voice service coding and decoding capability set and establishing a called end core network bearer and a called end wireless bearer; if the intersection of the voice service coding and decoding capability set and the called coding and decoding capability set is an empty set, judging whether the called end media gateway supports the voice service coding and decoding;

if the called end media gateway supports the voice service coding and decoding, determining the called end target media gateway according to the voice service coding and decoding capability set and establishing a core network bearer, and establishing a wireless bearer according to the called end media gateway coding and decoding capability set; if the called end media gateway does not support the voice service coding and decoding, judging whether the intersection of the called end media gateway coding and decoding capacity set and the voice service coding and decoding capacity set is an empty set.

If the intersection of the called end media gateway coding and decoding capability set and the voice service coding and decoding capability set is a non-empty set, determining the called end target media gateway according to the called end wireless coding and decoding capability set and establishing a core network bearer by the called end, and establishing a called end wireless bearer according to the voice service coding and decoding capability set.

It should be noted that the calling end control server may determine a calling codec capability set according to the method shown in fig. 3, specifically, the home end in steps 201 to 212 of the foregoing embodiment is a called end, and W is a calling end MGW codec capability set W (i.e., a calling end media gateway codec capability set according to the embodiment of the present invention); p is a calling terminal coding and decoding capability set, and calling request information (setup message) reported by a calling party is determined; q is a calling terminal wireless coding and decoding capability set configured by the calling terminal call controller.

The called end control server may also determine a called codec capability set according to the method in fig. 3, specifically, the home end in steps 201 to 212 of the foregoing embodiment is a called end, and W is a called end MGW codec capability set W (i.e., a called end media gateway codec capability set according to the embodiment of the present invention); p is the coding and decoding capability set of the called terminal and is determined according to the call confirmation message (call confirmed signaling) reported by the called terminal; q, calling the called end wireless coding and decoding capability set configured by the controller.

The invention provides a coding and decoding negotiation method, which comprises the steps of firstly negotiating the coding and decoding capability sets of a calling party and a called party to obtain the coding and decoding capability set of the calling party and the coding and decoding capability set of the called party, wherein at least one of the coding and decoding capability sets of the calling party and the called party comprises target coding and decoding capability information. And then the voice service coding and decoding capability set determined according to the calling coding and decoding capability set and the called coding and decoding capability set also comprises target coding and decoding capability information, a calling terminal target media gateway and a called terminal target media gateway are determined according to the voice service coding and decoding capability set, and then voice service between calling and called can be carried out through the calling terminal target media gateway and the called terminal target media gateway based on the target coding and decoding capability information. Therefore, the voice coding and decoding capability finally negotiated by the calling party and the called party centrally comprises the target coding and decoding mode, the voice service can be carried out based on the target coding and decoding mode, the MOS value of the voice service is improved, and the user experience is optimized.

Example 2:

an embodiment of the present invention provides a called-side call controller, as shown in fig. 6, where the called-side call controller includes: an acquisition unit 401 and a determination unit 402.

An obtaining unit 401, configured to obtain a calling codec capability set and a called codec capability set; at least one of the calling codec capability set and the called codec capability set comprises target codec capability information.

A determining unit 402, configured to determine a voice service codec capability set according to the calling codec capability set and the called codec capability set; the voice service coding and decoding capability set comprises the target coding and decoding capability information, so that the called terminal call controller and/or the calling terminal call controller can determine a target media gateway according to the target coding and decoding capability information and utilize the target media gateway to carry the voice service between the calling terminal and the called terminal.

The obtaining unit 401 is specifically configured to determine an encoding and decoding capability set of a media gateway at a called end according to encoding and decoding capability information of the media gateway at the called end, determine a wireless encoding and decoding capability set of the called end according to wireless encoding and decoding capability information of the called end, and determine an encoding and decoding capability set of the called end according to encoding and decoding capability information of the called end.

The obtaining unit 401 is specifically configured to determine an intersection of the called-side media gateway codec capability set, the called-side wireless codec capability set, and the called-terminal codec capability set.

If the intersection of the called terminal media gateway coding and decoding capability set, the called terminal wireless coding and decoding capability set and the called terminal coding and decoding capability set is an empty set, when the called terminal wireless coding and decoding capability set is determined to contain the target coding and decoding capability information, the called terminal media gateway coding and decoding capability set is generated according to the target coding and decoding capability information in the called terminal wireless coding and decoding capability set.

The obtaining unit 401 is further configured to determine a first set, where the first set is an intersection of the called-end media gateway codec capability set, the called-end wireless codec capability set, and the called-end codec capability set. And if the called end media gateway coding and decoding capability set comprises the target coding and decoding capability information, generating a target coding and decoding capability set according to the target coding and decoding capability information contained in the called end media gateway coding and decoding capability set.

Determining an intersection of the first set and the target codec capability set.

And if the intersection of the first set and the target coding and decoding capability set is an empty set, determining that the target coding and decoding capability set is the calling coding and decoding capability set.

The determining unit 402 is configured to determine an intersection of the calling codec capability set and the called codec capability set.

And if the intersection of the calling encoding and decoding capability set and the called encoding and decoding capability set is an empty set, determining that the voice service encoding and decoding capability set comprises the calling encoding and decoding capability set and the called encoding and decoding capability.

It should be noted that the called-side call controller shown in fig. 6 may be an MSC server in the network architecture diagram shown in fig. 1, i.e., a call controller in an intra-office call system. Or may be an MSC server B (MSC server of the called side) in the network architecture shown in fig. 4, that is, a call controller of the called side in the inter-exchange call system.

An embodiment of the present invention provides a calling side call controller, as shown in fig. 7, where the calling side call controller includes: determination section 501, transmission section 502, and reception section 503.

A determining unit 501, configured to determine a calling codec capability set.

A sending unit 502, configured to send the calling codec capability set to the called-side call controller, so that the called-side call controller determines a voice service codec capability set according to the calling codec capability set and the called codec capability set; the voice service coding and decoding capability set comprises the target coding and decoding capability information, and at least one of the calling coding and decoding capability set and the called coding and decoding capability set comprises the target coding and decoding capability information;

a receiving unit 503, configured to receive the voice service codec capability set sent by the called-end call controller.

The determining unit 501 is specifically configured to determine an encoding and decoding capability set of a media gateway of a calling terminal according to encoding and decoding capability information of the media gateway of the calling terminal, determine a wireless encoding and decoding capability set of the calling terminal according to the wireless encoding and decoding capability information of the calling terminal, and determine an encoding and decoding capability set of the calling terminal according to the encoding and decoding capability information of the calling terminal.

The determining unit 501 is specifically configured to determine an intersection of the calling terminal media gateway codec capability set, the calling terminal wireless codec capability set, and the calling terminal codec capability set.

If the intersection of the calling terminal media gateway coding and decoding capability set, the calling terminal wireless coding and decoding capability set and the calling terminal coding and decoding capability set is an empty set, when the calling terminal wireless coding and decoding capability set is determined to contain the target coding and decoding capability information, the calling terminal coding and decoding capability set is generated according to the target coding and decoding capability information in the calling terminal wireless coding and decoding capability set.

The determining unit 501 is specifically configured to determine a second set, where the second set is an intersection of the media gateway codec capability set of the calling terminal, the wireless codec capability set of the calling terminal, and the codec capability set of the calling terminal. And if the coding and decoding capability set of the calling end media gateway comprises the target coding and decoding capability information, generating a target coding and decoding capability set according to the target coding and decoding capability information contained in the coding and decoding capability set of the calling end media gateway.

Determining an intersection of the second set and the target codec capability set.

And if the intersection of the second set and the target coding and decoding capability set is an empty set, determining that the target coding and decoding capability set is the calling coding and decoding capability set. And if the intersection of the second set and the target coding and decoding capability set is a non-empty set, determining that the intersection of the second set and the target coding and decoding capability set is the calling coding and decoding capability set.

The calling controller firstly negotiates the calling and called codec capability sets to obtain the calling codec capability set and the called codec capability set, and at least one of the calling codec capability set and the called codec capability set comprises target codec capability information. And then the voice service coding and decoding capability set determined according to the calling coding and decoding capability set and the called coding and decoding capability set also comprises target coding and decoding capability information, a calling terminal target media gateway and a called terminal target media gateway are determined according to the voice service coding and decoding capability set, and then voice service between calling and called can be carried out through the calling terminal target media gateway and the called terminal target media gateway based on the target coding and decoding capability information. Therefore, the voice coding and decoding capability finally negotiated by the calling party and the called party centrally comprises the target coding and decoding mode, the voice service can be carried out based on the target coding and decoding mode, the MOS value of the voice service is improved, and the user experience is optimized.

Through the above description of the embodiments, it is clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional modules is merely used as an example, 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 process of the device described above, reference may be made to the corresponding process in the foregoing method embodiment, which is not described herein again.

The modules described as separate parts may or may not be physically separate, and parts displayed as modules may be one physical module or a plurality of physical modules, may be located in one place, or may be distributed in a plurality of different places. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, functional modules in the embodiments of the present invention may be integrated into one processing module, or each of the modules may exist alone physically, or two or more modules are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.

The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may be stored in a readable storage medium. Based on such understanding, the technical solution of the present invention may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in the form of a software product, where the software product is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

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 all 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

1. A codec negotiation method, comprising:

the called terminal call controller determines a voice service coding and decoding capability set according to the calling coding and decoding capability set and the called coding and decoding capability set, and the method comprises the following steps:

if the intersection of the calling encoding and decoding capability set and the called encoding and decoding capability set is an empty set, determining that the voice service encoding and decoding capability set comprises the calling encoding and decoding capability set and the called encoding and decoding capability set;

if the intersection of the calling encoding and decoding capability set and the called encoding and decoding capability set is a non-empty set, determining that the voice service encoding and decoding capability set is the intersection of the calling encoding and decoding capability set and the called encoding and decoding capability set; the voice service coding and decoding capability set comprises the target coding and decoding capability information, so that the called terminal call controller and/or the calling terminal call controller can determine a target media gateway according to the target coding and decoding capability information and utilize the target media gateway to carry the voice service between the calling terminal and the called terminal.

2. The method of claim 1, wherein the acquiring, by the called-side call controller, the called codec capability set specifically comprises:

and determining the called encoding and decoding capability set according to the called end media gateway encoding and decoding capability set, the called end wireless encoding and decoding capability set and the called terminal encoding and decoding capability set.

3. The method of claim 2, wherein the determining the called codec capability set according to the called-side media gateway codec capability set, the called-side wireless codec capability set, and the called-side codec capability set specifically comprises:

if the intersection of the called terminal media gateway coding and decoding capability set, the called terminal wireless coding and decoding capability set and the called terminal coding and decoding capability set is a non-empty set, judging whether the called terminal media gateway coding and decoding capability set contains the target coding and decoding capability information, and if the called terminal media gateway coding and decoding capability set contains the target coding and decoding capability information, generating the called coding and decoding capability set according to the target coding and decoding capability information in the called terminal media gateway coding and decoding capability set; and if the called end media gateway coding and decoding capability set does not contain the target coding and decoding capability information, determining the called end media gateway coding and decoding capability set as the called coding and decoding capability set.

4. The method of claim 2, wherein the determining the called codec capability set according to the called-side media gateway codec capability set, the called-side wireless codec capability set, and the called-side codec capability set specifically comprises:

if the intersection of the first set and the target coding and decoding capacity set is an empty set, determining that the target coding and decoding capacity set is the called coding and decoding capacity set;

and if the intersection of the first set and the target coding and decoding capacity set is a non-empty set, determining that the intersection of the first set and the target coding and decoding capacity set is the called coding and decoding capacity set.

5. A codec negotiation method, comprising:

the calling terminal call controller sends the calling codec capability set to a called terminal call controller, so that the called terminal call controller determines a voice service codec capability set according to the calling codec capability set and the called codec capability set, and the method comprises the following steps:

if the intersection of the calling encoding and decoding capability set and the called encoding and decoding capability set is a non-empty set, determining that the voice service encoding and decoding capability set is the intersection of the calling encoding and decoding capability set and the called encoding and decoding capability set; the voice service coding and decoding capability set comprises target coding and decoding capability information, and at least one of the calling coding and decoding capability set and the called coding and decoding capability set comprises the target coding and decoding capability information.

6. The method of claim 5, wherein the determining, by the calling-side call controller, the calling codec capability set specifically comprises:

and determining the calling encoding and decoding capability set according to the calling terminal media gateway encoding and decoding capability set, the calling terminal wireless encoding and decoding capability set and the calling terminal encoding and decoding capability set.

7. The method of claim 6, wherein the determining the calling codec capability set according to the calling-side media gateway codec capability set, the calling-side wireless codec capability set, and the calling-side terminal codec capability set specifically comprises:

if the intersection of the calling terminal media gateway codec capability set, the calling terminal wireless codec capability set and the calling terminal codec capability set is a non-empty set, if the calling terminal media gateway codec capability set contains the target codec capability information, generating the calling terminal codec capability set according to the target codec capability information in the calling terminal media gateway codec capability set; and if the coding and decoding capability set of the media gateway of the calling terminal does not contain the target coding and decoding capability information, determining the coding and decoding capability set of the media gateway of the calling terminal as the coding and decoding capability set of the calling terminal.

8. The method of claim 6, wherein if the target codec capability information is included in the calling-side media gateway codec capability set, generating a target codec capability set according to the target codec capability information included in the calling-side media gateway codec capability set;

9. A called-side call controller, comprising:

a determining unit, configured to determine a voice service codec capability set according to the calling codec capability set and the called codec capability set, including:

10. The called-side call controller according to claim 9, wherein the obtaining unit is specifically configured to,

determining the called encoding and decoding capability set according to the called end media gateway encoding and decoding capability set, the called end wireless encoding and decoding capability set and the called terminal encoding and decoding capability set; at least one of the calling terminal wireless coding and decoding capability set, the calling terminal media gateway coding and decoding capability set, the calling terminal coding and decoding capability set, the called terminal wireless coding and decoding capability set, the called terminal media gateway coding and decoding capability set and the called terminal coding and decoding capability set comprises the target coding and decoding capability information.

11. The called-side call controller according to claim 10, wherein the obtaining unit is specifically configured to determine an intersection of the called-side media gateway codec capability set, the called-side wireless codec capability set, and the called-side terminal codec capability set;

if the intersection of the called terminal media gateway coding and decoding capability set, the called terminal wireless coding and decoding capability set and the called terminal coding and decoding capability set is a non-empty set, if the called terminal media gateway coding and decoding capability set contains the target coding and decoding capability information, generating the called terminal coding and decoding capability set according to the target coding and decoding capability information in the called terminal media gateway coding and decoding capability set; and if the called end media gateway coding and decoding capability set does not contain the target coding and decoding capability information, determining the called end media gateway coding and decoding capability set as the called coding and decoding capability set.

12. The called-side call controller according to claim 10, wherein the obtaining unit is further configured to,

13. A calling-side call controller, comprising:

a determining unit, configured to determine a calling codec capability set;

a sending unit, configured to send the calling codec capability set to a called-side call controller, so that the called-side call controller determines a voice service codec capability set according to the calling codec capability set and the called codec capability set, where the sending unit includes:

if the intersection of the calling encoding and decoding capability set and the called encoding and decoding capability set is a non-empty set, determining that the voice service encoding and decoding capability set is the intersection of the calling encoding and decoding capability set and the called encoding and decoding capability set; the voice service coding and decoding capability set comprises target coding and decoding capability information, and at least one of the calling coding and decoding capability set and the called coding and decoding capability set comprises the target coding and decoding capability information;

14. The calling-side call controller according to claim 13, wherein the determining unit is specifically configured to determine a calling-side media gateway codec capability set according to the codec capability information of the calling-side media gateway, determine a calling-side wireless codec capability set according to the calling-side wireless codec capability information, and determine a calling-side terminal codec capability set according to the codec capability information of the calling terminal;

15. The calling-side call controller according to claim 14, wherein the determining unit is specifically configured to determine an intersection of the calling-side media gateway codec capability set, the calling-side wireless codec capability set, and the calling-side terminal codec capability set;

16. Calling-end call controller according to claim 14, characterized in that the determining unit is specifically configured to,