WO2016184281A1

WO2016184281A1 - Media interoperability method and device thereof

Info

Publication number: WO2016184281A1
Application number: PCT/CN2016/079309
Authority: WO
Inventors: 张立斌
Original assignee: 华为技术有限公司
Priority date: 2015-05-19
Filing date: 2016-04-14
Publication date: 2016-11-24
Also published as: CN105100046A

Abstract

Disclosed are a media interoperability method and device thereof. The method comprises: determining, by a control panel, that a first user equipment (UE) employs a first media format and a second UE communicating with the first UE employs a second media format, the second media format being an EVS main mode; and notifying a user plane device of converting a media packet in the first media format transmitted by the first UE to a media packet in the EVS compatible mode and a media packet in the EVS compatible mode transmitted by the second UE to a media packet in the first media format. The present invention realizes interoperability between a media format of a first user and media data of a second user based on an EVS compatible mode.

Description

Media interworking method and device thereof

The present application claims priority to Chinese Patent Application No. 20151025662, filed on May 19, 2015, the entire disclosure of which is hereby incorporated by reference. in.

Technical field

The present invention relates to the field of communications, and in particular, to a media interworking method and apparatus therefor.

Background technique

In the field of communication, such as real-time call service, before the call is established, the calling and called parties need to interact with each other's media capabilities. This process is called media negotiation. Through media negotiation, the calling party and the called party can know the media capabilities of the peer end, thereby determining the media data encoding format used when communicating with the peer end.

The 3GPP standard recently defines an EVS (Enhanced Voice Services) codec solution, as described in 3GPP 26.445. The codec solution has the characteristics of good codec quality and high coding rate, and is compatible with the rate of AMR-WB (Adaptive Multi-Rate-Wideband) codec. The EVS codec scheme has two modes: primary mode and compatibility mode, and compatibility mode is also called AMR-WB IO mode. When using the EVS codec scheme, only one of the main mode or the compatible mode can be used.

The Single Radio Voice Call Continuity (SRVCC) service means that the user roams from the E-UTRAN (Evolved Universal Terrestrial Radio Access Network) to the UTRAN (UMTS Terrestrial Radio) during the call. When the Access Network (Universal Mobile Telecommunications System Radio Access Network)/GERAN (GSM EDGE Radio Access Network) is connected to the network device, the user's call is kept uninterrupted.

After network switching, users in UTRAN/GERAN use AMR (Adaptive Multi-Rate) or other codec mode to encode and decode media data, and users still resident in E-UTRAN network use EVS main mode. Encode and decode media data. The codec mode used in UTRAN/GERAN is incompatible with the EVS main mode used in the E-UTRAN network, and interworking cannot be achieved.

It can be seen that there is a need for a media interworking solution between the EVS main mode and other codec modes.

Summary of the invention

The embodiment of the invention provides a media interworking method and a device thereof for implementing media interworking between an EVS main mode and other codec modes.

In a first aspect, a method for media interworking is provided, the method comprising:

The control device determines that the first user equipment adopts the first media format, and the second user equipment that communicates with the first user equipment adopts a second media format, where the first media format is different from the second media format, The second media format is an EVS main mode;

The control plane device sends a notification message to the user plane device, where the notification message is used to notify the user plane device to convert the media packet sent by the first user equipment to a media format of the first media format into a media format. The media message in the EVS-compatible mode and the media message in the EMS-compatible mode sent by the second user equipment are converted into the media message in the media format.

In conjunction with the first aspect, in a first possible implementation manner of the first aspect, the information about the first media format and the information of the second media format are included in the notification message.

With reference to the first aspect, in a second possible implementation manner of the first aspect, the method further includes: the control plane device determining the user plane device according to the first media format and the second media format Communicating with the second user equipment by using the EVS compatible mode, and communicating with the first user equipment by using the first media format; wherein the notification message includes a result determined by the control plane device.

In conjunction with the first aspect or the first or second possible implementation of the first aspect, in a third possible implementation of the first aspect, the method further includes:

The user plane device encapsulates the media data of the converted EVS compatible mode by using an ETP real-time transport protocol RTP message format or an ETP-compliant mode RTP message format of the EVS;

The user plane device encapsulates the converted media data of the first media format by using an RTP message format of the first media format.

With reference to the first aspect or the first or second possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect, the first media format is AMR-WB;

And the converting, by the first user equipment, the media message that is in the media format of the first media format into the media message in the EVS compatible mode, where:

The user plane device encapsulates the media data in the media packet sent by the first user equipment by using an RTP packet format of the EVS or an RTP packet format of the AMR-WB;

And converting, by the second user equipment, the media message in the EVS-compatible mode to the media message in the media format, including:

The user plane device encapsulates media data in the media packet sent by the second user equipment by using an RTP packet format of the AMR-WB.

In a second aspect, a media interworking method is provided, where the method includes:

The user plane device receives the notification message sent by the control plane device, and the notification message is used to notify the user plane device to convert the media message sent by the first user equipment to the media format of the first media format into an EVS. And converting the media message in the compatibility mode to the media message in the EMS compatible mode, and converting the media message in the media format to the media format in the first media format;

The user plane device receives the media packet sent by the first user equipment in the first media format, and converts the media packet sent by the first user equipment to the media format in the first media format. Transmitting, to the second user equipment, a media message whose converted media format is an EVS compatible mode, for the media message in the EVS-compatible mode;

The user plane device receives the media message sent by the second user equipment in the EVS compatible mode, and converts the media message sent by the second user equipment to the EMS compatible mode into a media format. The media message in a media format sends the converted media format to the first user equipment as the media message in the first media format.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the media message in the EVS compatible mode is a media format field, where the media format field is used to notify the The second user equipment encodes the media data sent by the second user equipment to the first user equipment by using an EVS compatibility mode.

With reference to the second aspect, or the first possible implementation manner of the second aspect, in the second possible implementation manner of the second aspect, the information that the first media format is included in the notification message, and the second Information in the media format;

The method further includes: determining, by the user plane device, that the EVS compatibility mode is performed with the second user equipment according to the information of the first media format and the information of the second media format included in the notification message. Communication, communicating with the first user equipment in a first media format.

With reference to the second aspect, or the first or the second possible implementation manner of the second aspect, in a third possible implementation manner of the second aspect, the method further includes:

With reference to the second aspect, in a fourth possible implementation manner of the second aspect, the first media format is AMR-WB;

The user plane device converts the media message that is sent by the first user equipment to the media format of the first media format into a media message whose media format is an EVS compatible mode, and includes:

The user plane device converts the media message that is sent by the second user equipment to the EMS-compatible mode into a media message whose media format is the first media format, and includes:

In a third aspect, a media interworking method is provided, where the method includes:

The control plane entity in the media conversion device determines that the first user equipment adopts the first media format, and the second user equipment that communicates with the first user equipment adopts the second media format, where the first media format is different from the a second media format, where the second media format is an enhanced voice service EVS main mode;

The control plane entity sends a notification message to a user plane entity in the media conversion device, the notification message is used for Notifying the user plane entity to convert the media message sent by the first user equipment to the media format of the first media format into a media message with the media format being the EVS compatible mode and the media format sent by the second user equipment Converting the media message in the EVS compatible mode to the media message in the media format as the first media format;

The user plane entity receives the media packet sent by the first user equipment in the first media format, and converts the media packet sent by the first user equipment to the media format in the first media format. Transmitting, to the second user equipment, a media message whose converted media format is an EVS compatible mode, for the media message in the EVS-compatible mode;

The user plane entity receives the media message sent by the second user equipment in the EVS compatible mode, and converts the media message sent by the second user equipment to the EMS compatible mode into a media format. The media message in a media format sends the converted media format to the first user equipment as the media message in the first media format.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the media message in the EVS compatible mode is a media format field, where the media format field is used to notify the The second user equipment encodes the media data sent by the second user equipment to the first user equipment by using an EVS compatibility mode.

With reference to the third aspect, or the first possible implementation manner of the third aspect, in a second possible implementation manner of the third aspect, the information that the first media format and the second information are included in the notification message Information in the media format;

The method further includes: determining, by the user plane entity, that the EVS compatibility mode is performed with the second user equipment according to the information of the first media format and the information of the second media format included in the notification message. Communication, communicating with the first user equipment in a first media format.

With reference to the third aspect, or the first possible implementation manner of the third aspect, in a third possible implementation manner of the third aspect, the method further includes: the control plane entity according to the first media format and The second media format determines that the user plane entity communicates with the second user equipment by using an EVS compatible mode, and uses the first media format to communicate with the first user equipment; wherein the notification message includes The result of the control plane entity determination.

With reference to the third aspect, or any one of the first to the third possible implementation manners of the third aspect, in a fourth possible implementation manner of the third aspect, the method further includes:

The user plane entity encapsulates the media data of the converted EVS compatible mode by using an ETP real-time transport protocol RTP message format or an ETS-compliant mode RTP message format;

The user plane entity encapsulates the converted media data of the first media format by using an RTP message format of the first media format.

With reference to the third aspect, in a fifth possible implementation manner of the third aspect, the first media format is AMR-WB;

The user plane entity encapsulates media data in the media packet sent by the first user equipment by using an RTP packet format of the EVS or an RTP packet format of the AMR-WB;

The user plane entity encapsulates the media data in the media packet sent by the second user equipment by using an RTP packet format of the AMR-WB.

In a fourth aspect, a control surface device is provided, the control surface device comprising:

a determining module, configured to determine that the first user equipment adopts a first media format, and the second user equipment that communicates with the first user equipment adopts a second media format, where the first media format is different from the second media Format, the second media format is an enhanced voice service EVS main mode;

a notification module, configured to send a notification message to the user plane device, where the notification message is used to notify the user plane device to convert the media message sent by the first user equipment to a media format of the first media format into a media format The media message in the EVS-compatible mode and the media message in the EMS-compatible mode sent by the second user equipment are converted into the media message in the media format.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the information about the first media format and the information of the second media format are included in the notification message.

With reference to the fourth aspect, in a second possible implementation manner of the fourth aspect, the control plane device further includes: a determining module, configured to determine the user according to the first media format and the second media format The device communicates with the second user equipment in an EVS compatible mode, and communicates with the first user equipment by using the first media format; wherein the notification message includes a result determined by the control plane device.

With reference to the first or second possible implementation of the fourth aspect, in a third possible implementation manner of the fourth aspect, the first media format is AMR-WB;

The notification message is used to notify the user plane device to encapsulate the media data in the media message sent by the first user equipment by using the RTP message format of the EVS or the RTP message format of the AMR-WB, and use the AMR-WB The RTP message format encapsulates the media data in the media message sent by the second user equipment.

A fifth aspect provides a user plane device, where the user plane device includes:

a receiving module, configured to receive a notification message sent by the control plane device, where the notification message is used to notify the user plane device to convert the media message sent by the first user equipment to a media format in a first media format Converting the media message in the EVS-compatible mode to the media message in the EMS-compatible mode and the media message in the media format as the media format in the first media format;

a first conversion module, configured to receive a media message that is sent by the first user equipment to a media format of the first media format, and convert the media message sent by the first user equipment to a media format of the first media format to And the media message in the EVS compatible mode is sent to the second user equipment, and the converted media format is a media message in an EVS compatible mode.

a second conversion module, configured to receive a media message sent by the second user equipment in an EVS-compatible mode, and convert the media message sent by the second user equipment to an EVS-compatible mode into a media format Sending, to the first user equipment, a media message whose converted media format is the first media format, for the media message in the first media format.

With reference to the fifth aspect, in a first possible implementation manner of the fifth aspect, the media packet that is converted by the first conversion module to the EVS compatible mode carries a media format field, where the media format field is Used to notify the The second user equipment encodes the media data sent by the second user equipment to the first user equipment by using an EVS compatibility mode.

With reference to the fifth aspect, or the first possible implementation manner of the fifth aspect, in a second possible implementation manner of the fifth aspect, the notification message includes the information of the first media format and the second Information in the media format;

The user plane device further includes:

a decision module, configured to determine, according to the information of the first media format and the information of the second media format included in the notification message, to communicate with the second user equipment by using an EVS compatible mode, using the first media The format communicates with the first user device.

With reference to the fifth aspect or the first or second possible implementation manner of the fifth aspect, in a third possible implementation manner of the fifth aspect, the first conversion module is further configured to perform real-time transmission using the EVS The RTP packet format of the protocol RTP packet format or the EVS compatible mode encapsulates the media data of the converted EVS compatible mode; the second conversion module is further configured to encapsulate the RTP packet format using the first media format Converting the obtained media data of the first media format.

With reference to the fifth aspect, in a fourth possible implementation manner of the fifth aspect, the first media format is AMR-WB;

The first conversion module is configured to encapsulate the media data in the media packet sent by the first user equipment by using an RTP packet format of the EVS or an RTP packet format of the AMR-WB;

The second conversion module is configured to encapsulate the media data in the media packet sent by the second user equipment by using an RTP packet format of the AMR-WB.

In a sixth aspect, a media conversion device is provided, where the media conversion device includes:

a control plane entity, configured to determine that the first user equipment adopts the first media format, and the second user equipment that communicates with the first user equipment adopts a second media format, where the first media format is different from the second a media format, the second media format is an enhanced voice service EVS main mode; and sending a notification message to the user plane device, the notification message being used to notify the user plane device of the media format sent by the first user equipment Converting the media message in the first media format to the media message in the EVS-compatible mode, and converting the media message in the EVS-compatible mode sent by the second user device to the media format as the first media format Media message;

The user plane entity is configured to receive the media packet sent by the first user equipment in the media format of the first media format, and convert the media packet sent by the first user equipment to the media format in the first media format. The media message in the EVS-compatible mode is sent to the second user equipment, and the media format sent by the second user equipment is an EVS compatible mode. Transmitting, by the second user equipment, the media message that is sent by the second user equipment to the EMS-compatible mode, and converting the media packet that is in the media format to the first media format, and sending the converted media format to the first user equipment. The media message is the first media format.

With reference to the sixth aspect, in a first possible implementation manner of the sixth aspect, the media format of the media format that is converted by the user plane entity in the EVS compatible mode carries a media format field, where the media format field is used. The second user equipment is notified to encode the media data sent by the second user equipment to the first user equipment by using an EVS compatible mode.

With reference to the sixth aspect, or the first possible implementation manner of the sixth aspect, in a second possible implementation manner of the sixth aspect, the information that the first media format and the second information are included in the notification message Information in the media format;

The user plane entity is further configured to determine, according to the information about the first media format and the information of the second media format that are included in the notification message, that the adopting an EVS compatibility mode and the second user equipment Communicating, using the first media format to communicate with the first user equipment.

With reference to the sixth aspect, or the first possible implementation manner of the sixth aspect, in a third possible implementation manner of the sixth aspect, the control plane entity is further configured to use the first media format and the The second media format determines that the user plane device communicates with the second user equipment in an EVS compatible mode, and communicates with the first user equipment by using the first media format; wherein the notification message includes the The result of the control plane device determination.

With reference to the sixth aspect, or the first possible implementation manner of the sixth aspect, in a fourth possible implementation manner of the sixth aspect, the user plane entity is further used for real-time transmission protocol using EVS The RTP packet format of the RTP packet format or the EVS compatible mode encapsulates the media data of the converted EVS compatible mode; and the RTP packet format of the first media format is used to encapsulate the converted media of the first media format data.

With reference to the sixth aspect, in a fifth possible implementation manner of the sixth aspect, the first media format is AMR-WB, and the user plane entity is specifically used to use an RTP packet format of the EVS or an AMR-WB The RTP packet format encapsulates the media data in the media packet sent by the first user equipment; and encapsulates the media data in the media packet sent by the second user equipment by using an RTP packet format of the AMR-WB.

According to a seventh aspect, a control plane device is provided, the control plane device comprising: an interface, a processing unit, and a memory; the processing unit is configured to control operation of the control plane device; and the memory is used to send to the processing unit Providing instructions and data; the various components of the control plane device are coupled together by a bus system;

The processing unit is specifically configured to read a program of the memory, and performs the following process:

Determining that the first user equipment adopts the first media format, and the second user equipment that communicates with the first user equipment adopts a second media format, where the first media format is different from the second media format, The second media format is the EVS main mode;

Sending a notification message to the user plane device, where the notification message is used to notify the user plane device to convert the media message sent by the first user equipment to the media format of the first media format into a media format of the EVS compatible mode. The message and the media message sent by the second user equipment in the EVS compatible mode are converted into the media message whose media format is the first media format.

The foregoing process performed by the processing unit is similar to the specific implementation process of the foregoing first aspect, and details are not described herein again.

According to an eighth aspect, a user plane device is provided, the user plane device includes: an interface, a processing unit, and a memory; the processing unit is configured to control an operation of the user plane device; and the memory is used to the processing unit Providing instructions and data; the various components of the user plane device are coupled together by a bus system;

And receiving, by the control plane device, a notification message, where the notification message is used to notify the user plane device to convert the media message sent by the first user equipment to a media format of the first media format into an EVS compatible mode. a media message, and converting, by the second user equipment, a media message whose media format is an EVS compatible mode into a media message whose media format is the first media format;

Receiving, by the first user equipment, a media packet whose media format is the first media format, and converting the media packet sent by the first user equipment to the media format of the first media format into an EVS compatible mode. Transmitting, to the second user equipment, a media message whose converted media format is an EVS compatible mode;

Receiving, by the second user equipment, a media message whose media format is an EVS compatible mode, and converting, by the second user equipment, a media message whose media format is an EVS compatible mode into a media format whose media format is the first media format Transmitting, to the first user equipment, the converted media format is a media message in a first media format.

The foregoing process performed by the processing unit is similar to the specific implementation process of the foregoing second aspect, and details are not described herein again.

A ninth aspect, a media conversion device is provided, the media conversion device includes: an interface, a processing unit, and a memory; the processing unit is configured to control an operation of the user plane device; and the memory is used to send to the processing unit Providing instructions and data; the various components of the user plane device are coupled together by a bus system;

The control plane entity determines that the first user equipment adopts the first media format, and the second user equipment that communicates with the first user equipment adopts a second media format, where the first media format is different from the second media format, The second media format is an enhanced voice service EVS main mode;

Sending a notification message to the user plane entity, the notification message is used to notify the user plane entity to convert the media message sent by the first user equipment to the media format of the first media format into a media format of the EVS compatible mode. And converting the media message sent by the second user equipment to the EMS compatible mode into a media message whose media format is the first media format;

The user plane entity receives the media packet sent by the first user equipment in the media format of the first media format, and converts the media packet sent by the first user equipment to the media format of the first media format into an EVS. And the media message of the compatible mode is sent to the second user equipment, where the converted media format is an EVS compatible mode media message;

The user plane entity receives the media message sent by the second user equipment in the EVS-compatible mode, and converts the media message sent by the second user equipment into the EVS-compatible mode into the media format as the first medium. The formatted media message sends the converted media format to the first user equipment as the media message in the first media format.

The foregoing process performed by the processing unit is similar to the specific implementation process of the foregoing third aspect, and details are not described herein again.

In the embodiment of the present invention, the second user equipment that uses the first media format and that communicates with the first user equipment uses the second media format, where the first media format is different from the second media format. The second media format, where the second media format is an EVS main mode, and notifying the user plane device of the media space sent by the first user equipment Converting the media message in the first media format to the media message in the EVS-compatible mode, and converting the media message in the EVS-compatible mode sent by the second user device to the media format as the first media The format of the media message is such that the user plane converts the media message exchanged between the first user equipment and the second user equipment according to the notification message, thereby implementing media interworking.

DRAWINGS

1 is a schematic diagram of a network architecture related to an SRVCC service and an SRVCC handover scenario in the prior art;

2 is a schematic diagram of a network architecture related to eSRVCC services and an eSRVCC handover scenario in the prior art;

FIG. 3 is a schematic structural diagram of a control plane device 300 according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of a user plane device 400 according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a media conversion device 500 according to an embodiment of the present disclosure;

FIG. 6 is a schematic flowchart of a control plane process according to an embodiment of the present invention;

FIG. 7 is a schematic flowchart of user plane processing according to an embodiment of the present invention;

FIG. 8 is a schematic flowchart of a media negotiation signaling process according to an embodiment of the present invention;

FIG. 9 is a schematic flowchart of interworking between an AMR-WB codec and an EVS main mode codec in an eSRVCC scenario according to an embodiment of the present invention;

10a and 10b are respectively schematic diagrams of a media format conversion process according to an embodiment of the present invention;

11a, 11b, and 11c are schematic diagrams of packet formats in an embodiment of the present invention;

FIG. 12 is a schematic flowchart of a media negotiation signaling process according to another embodiment of the present invention; FIG.

FIG. 13 is a schematic flowchart of interworking between AMR-WB codec and EVS main mode codec in an eSRVCC scenario according to another embodiment of the present invention;

14a and 14b are schematic structural views of a control plane device 600 and a control plane device 610 according to another embodiment of the present invention;

15a and 15b are schematic structural diagrams of a user plane device 700 and a user plane device 710 according to another embodiment of the present invention;

FIG. 16 is a schematic structural diagram of a media conversion device 800 according to another embodiment of the present invention.

detailed description

The embodiment of the invention provides a media interworking method and device thereof. In the embodiment of the present invention, when the media data of the EVS codec mode is converted with the media data of the other media codec mode, if the media negotiation result of the control plane is the second user equipment adopting the EVS main mode, the first user equipment adopts In other modes that are incompatible with the EVS main mode, the second user equipment is requested to switch the EVS main mode to the EVS compatible mode through the media message, so that the media message sent by the EVS codec of the second user equipment is sent. Can be correctly decoded by the user plane's AMR-WB decoder. Through the above implementation, In the case of basic interworking, the system resources required for the media codec conversion process can be saved.

The embodiments of the present invention can be applied to the field of VoLTE (Voice over LTE, which is a voice service carried by an IP channel provided by an LTE wireless network and an EPC core network), or any field in which media interworking is performed using an EVS codec scheme.

The present invention will be further described in detail with reference to the accompanying drawings, in which . All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

The following is a description of some of the various embodiments of the invention, which are intended to provide a basic understanding of the invention, and are not intended to identify key or critical elements of the invention. According to the technical solution of the present invention, other implementations can be obtained by replacing each other without changing the spirit of the present invention.

The embodiments of the present invention are described in detail in the following description of the embodiments of the present invention.

FIG. 1 exemplarily shows a VoLTE system architecture, and an SRVCC handover scenario under the architecture.

As shown in FIG. 1 , the basic architecture of VoLTE is composed of an LTE wireless network, an EPC (Evolved Packet Core), and an IMS (IP Multimedia Subsystem).

The EPC is used as an access network to access the IMS. The IMS provides voice and multimedia services for the user equipment. The CS (Circuit Switch) domain is the IMS access network. The SIP UA (Session Initiation Protocol User Agent) of the User Equipment (User Equipment) is the SCC AS (Service Centralization and Continuity Application Server) in the IMS. The UE in the CS domain accesses the IMS domain and completes IMS session establishment and control. The P-CSCF (Proxy-Call Session Control Function) is the first node accessed by the UE in the IMS.

The MME (Mobility Management Entity in Chinese) is mainly used for mobility management, session management, and user access authentication. S-GW (English: Serving-GateWay, Chinese: Service Gateway) It is mainly used to terminate the interface of the wireless access part, as an anchor point for handover between base stations, etc.; P-GW (English: Packet Data Network Gateway, Chinese: packet data gateway) is used as a gateway for connecting to the external network, and is mainly used for Terminate the Sgi interface for PDN (English: Packet Data Network, Chinese: Packet Data Network), service-based billing, and so on.

SRVCC IWF in the CS domain (English: InterWorking Function, Chinese: Interworking Network Function) is mainly used for interworking with other networks; MSC (English: Mobile Switching Center, Chinese: Mobile Switching Center) is mainly used for link management. . It is responsible for all call control signaling; MGW (English: Media Gateway, Chinese: Media Gateway) is mainly responsible for TDM from CS domain (English: Time Division Multiplex and Multiplexer, Chinese: Time Division Multiplexer and Multiplexer) The bearer and the IP bearer from the IMS domain or the ATM (English: Asynchronous Transfer Mode, Chinese: asynchronous transfer mode) bearer conversion.

UE1 and UE2 are both accessed by the E-UTRAN when the call is established. UE1 and UE2 use the EVS main mode to encode and decode media data through media negotiation. After the call between UE1 and UE2 is established, UE1 roams from E-UTRAN to UTRAN/GERAN, triggering the SRVCC handover procedure. The bearer paths of UE1 and UE2 before and after SRVCC handover are as shown in FIG. 1.

After the network is switched, the media codec mode used by the UE1 is AMR, and the media codec mode used by the UE2 is still in the EVS main mode. The two are incompatible with each other, that is, the two cannot communicate.

FIG. 2 exemplarily shows an eSRVCC handover scenario under the VoLTE system architecture.

eSRVCC (English: enhanced SRVCC, Chinese: Enhanced SRVCC) is an enhancement to SRVCC, and its network architecture is similar to SRVCC. eSRVCC optimizes the network of SRVCC, which is provided with ATCF (English: access transfer control function, Chinese: access conversion control function) functional entity and ATGW (English: access transfer gateway, Chinese: access conversion gateway) Functional entity. The ATCF and the ATGW are separated in logical functions. The ATCF is a functional entity of the control plane, and the ATGW is a functional entity of the user plane. The two can be deployed separately or in combination. If the ATCF is deployed in conjunction with the ATGW, the device deploying the two functional entities may be represented as an ATCF/ATGW. The ATCF/ATGW is generally deployed in combination with the P-CSCF. For example, the ATCF/ATGW is set in the P-CSCF entity and the I-CSCF (English: Interrogating-CSCF, Chinese: Query CSCF)/S-CSCF (English: Serving) -CSCF, Chinese: Service CSCF).

UE1 and UE2 are both accessed by the E-UTRAN when the call is established. UE1 and UE2 use the EVS main mode to encode and decode media data through media negotiation. After the call between UE1 and UE2 is established, UE1 roams from E-UTRAN to UTRAN/GERAN, triggering the eSRVCC handover procedure. The bearer paths of UE1 and UE2 before and after eSRVCC handover are as shown in FIG. 2.

It can be seen that, for a call in which an eSRVCC handover occurs, the media stream of the network switching user equipment is anchored to the ATGW, so that when the eSRVCC handover occurs again, only the media information on the ATGW needs to be updated, and the media of the peer user equipment does not need to be updated. Information that makes the entire eSRVCC switch time shorter.

Through the above system architecture, it can be seen that when the media formats used by the user devices interacting with the media are different, media conversion is required to implement media interworking.

In order to achieve media interworking, in one embodiment of the present invention, a control plane device 300 is provided, in another embodiment a user plane device 400 is provided, and in another embodiment a media conversion is provided. The device 500 can be applied to the above network architecture. The control plane device 300 can be obtained by modifying the ATCF entity in the above architecture. The user plane device 400 can be obtained by modifying the ATGW in the above architecture. The control plane device 300 and the user plane device 400 can cooperate to complete the media conversion function, so that the user equipment performing the media interaction performs media intercommunication if the media formats adopted by each other are incompatible with each other. The media conversion device 500 includes a control plane entity and a user plane entity, that is, both a control plane function and a user plane function.

The above three devices will be described in detail below with reference to FIG. 3, FIG. 4 and FIG. 5, respectively.

Referring to FIG. 3, a control plane device 300 according to an embodiment of the present invention is provided. The device can include an interface 301, a processing unit 302, and a memory 303. Processing unit 302 is for controlling the operation of control plane device 300; memory 303 can include read only memory and random access memory for providing instructions and data to processing unit 302. A portion of the memory 303 may also include non-volatile line random access memory (NVRAM). The various components of the control plane device 300 are coupled together by a bus system, wherein the bus system 309 includes, in addition to the data bus, a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 309 in the figure.

The control plane processing flow disclosed in the embodiment of the present invention may be applied to the processing unit 302 or implemented by the processing unit 302. In the implementation process, the steps of the control plane processing flow may be completed by the integrated logic circuit of the hardware in the processing unit 302 or the instruction in the form of software. The processing unit 302 can be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, and can be implemented or executed in an embodiment of the present invention. Various methods, steps, and logic blocks of the disclosure. A general purpose processor can be a microprocessor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory 303, and the processing unit 302 reads the information in the memory 303 and completes the steps of the control plane processing flow in conjunction with its hardware.

Referring to FIG. 4, a user plane device 400 according to an embodiment of the present invention is provided. The device can include an interface 401, a processing unit 402, and a memory 403. Processing unit 402 is operative to control the operation of user plane device 400; memory 403 can include read only memory and random access memory for providing instructions and data to processing unit 402. A portion of the memory 403 may also include non-volatile line random access memory (NVRAM). The various components of the user plane device 400 are coupled together by a bus system, wherein the bus system 409 includes, in addition to the data bus, a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 409 in the figure.

The user plane processing flow disclosed in the embodiment of the present invention may be applied to the processing unit 402 or implemented by the processing unit 402. In the implementation process, the steps of the user plane processing flow may be completed by the integrated logic circuit of the hardware in the processing unit 402 or the instruction in the form of software. The processing unit 402 can be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, and can implement or perform the embodiments of the present invention. Various methods, steps, and logic blocks of the disclosure. A general purpose processor can be a microprocessor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory 403, and the processing unit 402 reads the information in the memory 403 and completes the steps of the user plane processing flow in conjunction with its hardware.

FIG. 5 is a media conversion device 500 according to an embodiment of the present invention. The device can include an interface 501, a processing unit 502, and a memory 503. Processing unit 502 is for controlling the operation of media conversion device 500; memory 503 can include read only memory and random access memory for providing instructions and data to processing unit 502. A portion of the memory 503 may also include non-volatile line random access memory (NVRAM). The various components of the media conversion device 500 are coupled together by a bus system, wherein the bus system 509 includes, in addition to the data bus, a power bus, a control bus, and a status signal bus. However, for clarity of description, various buses are labeled as bus system 509 in the figure.

The control plane and user plane processing flow disclosed in the embodiments of the present invention may be applied to the processing unit 502 or implemented by the processing unit 502. In the implementation process, the steps of the control plane and the user plane processing flow may pass through the processing unit 502. The integrated logic of the hardware or the instructions in software form are completed. The processing unit 502 can be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, and can implement or perform the embodiments of the present invention. Various methods, steps, and logic blocks of the disclosure. A general purpose processor can be a microprocessor or any conventional processor or the like. The steps of the method disclosed in the embodiments of the present invention may be directly implemented as a hardware processor, or may be performed by a combination of hardware and software modules in the processor. The software module can be located in a conventional storage medium such as random access memory, flash memory, read only memory, programmable read only memory or electrically erasable programmable memory, registers, and the like. The storage medium is located in the memory 503, and the processing unit 502 reads the information in the memory 503, and completes the steps of the control plane processing flow and the user plane processing flow in combination with the hardware thereof.

The control plane processing flow and the user plane processing flow provided by the embodiments of the present invention can be respectively shown in FIG. 6 and FIG. 7. In all embodiments of the present invention, the control plane in the flow shown in FIGS. 6 and 7 refers to a control plane device or a control plane entity, such as the control plane device 300 or the media conversion device 500, unless otherwise stated. The control plane entity; the user plane refers to a user plane device or a user plane entity, such as a user plane device 400 or a user plane entity in the media conversion device 500.

FIG. 6 is a schematic flowchart of a control plane process according to an embodiment of the present invention. The operations illustrated in FIG. 6 may be implemented by control plane device 300 (eg, ATCF) or by a control plane entity in media conversion device 500.

The control plane processing flow shown in Figure 6 can include:

Step 601: The control plane determines that the first user equipment adopts the first media format, and the second user equipment that communicates with the first user equipment adopts the second media format.

The first user equipment and the second user equipment are not specifically related to one or a certain user equipment, and only represent the peer user equipments that are mutually interacting with the media data.

The second media format is an EVS main mode, and the first media format is different from the second media format. For example, the first media format is an AMR mode, and the second media format is an EVS main mode, or the first media format is a G.729 mode, and the second media format is an EVS main mode. Of course, the first media format may also be a media format of other types or protocols, which is not limited by the embodiment of the present invention.

Here, the first media format adopted by the first user equipment refers to a media format that the first user equipment is to use, or a media format that the first user equipment is currently using. Similarly, the second media format adopted by the second user equipment refers to a media format to be used by the second user equipment, or a media format currently being used by the second user equipment. For example, in the media negotiation phase, the control plane may determine the media format to be adopted by the first user equipment and the second user equipment according to the control signaling of the interaction between the first user equipment and the second user equipment in the media negotiation phase. For another example, in a circuit domain voice fallback scenario, the control plane can determine the media format being used by the first user equipment and the second user equipment.

Step 602: Control sending a notification message to the user plane. The notification message is used to notify the user plane to convert the media message sent by the first user equipment to the media format of the first media format into a media message whose media format is an EVS compatible mode, and to the second user. The media packet sent by the device in the EMS-compatible mode is converted into the media packet whose media format is the first media format. The EVS compatibility mode is an AMR-WB IO mode.

In step 602, in a preferred solution, the notification message includes the first medium used by the first user equipment. The information of the volume format and the information of the second media format used by the second user equipment, that is, the media format adopted by the first user equipment and the second user equipment is notified to the household equipment or the user plane entity by using the notification message, so that The user plane device or the user plane entity determines the media conversion according to the information, that is, determines to communicate with the second user equipment by using the EVS compatibility mode, and communicates with the first user equipment by using the first media format.

For example, if the first media format is incompatible with the second media format, for example, the first media format is AMR and the second media format is EVS main mode, the control plane will include the foregoing two media formats. After the notification message of the information is sent to the user plane, the user plane can determine the following media conversion policy according to the information: converting the media data of the first media format in the media message of the first user equipment into an EVS compatible mode. Media data, and mediating the converted EVS compatible mode media data by using an RTP (Real-time Transport Protocol) message format of the EVS or an RTP message format of the EVS compatible mode; The media data of the EVS compatible mode in the media message of the device is converted into the media data of the first media format, and the media data of the converted first media format is encapsulated by using the RTP message format of the first media format.

The media format is for the codec mode of the media data, and the media code of different media formats is obtained by using different codec modes. The packet format is for the encapsulation of the packet. In the embodiment of the present invention, the packet format refers to the encapsulation format of the media data.

In another preferred solution, the control plane determines, according to the first media format and the second media format, that the user plane communicates with the second user equipment by using an EVS compatible mode, A media format communicates with the first user equipment, and the determined result is carried in a notification message and sent to the user plane.

For example, if the first media format and the second media format are incompatible with each other, the control plane determines a media conversion policy according to a media format adopted by each of the first user equipment and the second user equipment, and passes the notification message. Notify the user of the media conversion policy. The media conversion policy may be: converting the media data of the first media format in the media message of the first user equipment into the media data of the EVS compatible mode, and using the RTP packet format or the EVS compatibility mode of the EVS. The RTP message format encapsulates the converted media data of the EVS compatible mode; converts the media data of the EVS compatible mode in the media message of the second user equipment into the media data of the first media format, and uses the The RTP message format of the first media format encapsulates the converted media data of the first media format.

If the first media format is AMR-WB, since the mode is compatible with the EVS main mode, there is no need to perform codec format conversion of the media data, and only media message format conversion is required.

Specifically, in an embodiment, after the control plane sends the notification message to the user plane, the user plane may determine the following media conversion policy according to the notification message: using the RTP packet format of the EVS or the RTP packet format of the AMR-WB. The media data in the media packet sent by the first user equipment encapsulates the media data in the media packet sent by the second user equipment by using the RTP packet format of the AMR-WB.

In another embodiment, the control plane determines a media conversion policy according to a media format adopted by each of the first user equipment and the second user equipment, and notifies the user plane by using a notification message. The media conversion policy may be: using the RTP packet format of the EVS or the RTP packet format of the AMR-WB to encapsulate the media data in the media packet sent by the first user equipment, and using The RTP packet format of the AMR-WB encapsulates the media data in the media packet sent by the second user equipment.

In the foregoing embodiment of the present invention, the RTP packet format of the EVS refers to a packet encapsulation format used for encapsulating RTP packets by using the media data encoded by the EVS main mode, and the RTP packet format of the EVS compatible mode refers to The media data encoded by the EVS-compatible mode is used to encapsulate the RTP packet format. The RTP packet format of the first media format is used to encapsulate the RTP packet encoded by the media encoded by the first media format. The packet encapsulation format used by the AMR-WB is the packet encapsulation format used for the RTP packet encapsulation of the media data obtained by using the AMR-WB mode.

As previously mentioned, the control plane process flow illustrated in FIG. 6 may be performed by control plane device 300 or a control plane entity in media conversion device 500. In the case where the control plane device 300 is used as the execution subject and the SIP (the Session Initiation Protocol) is used between the control plane device 300 and the user plane device 400, in step 602, the control plane device 300 can pass the SIP. The protocol sends the notification message to the user plane device 400. In the case that the media conversion device 500 is the execution entity, in step 602, the control plane entity of the device may send the notification message to the user plane of the device by using an internal protocol. entity.

Taking the execution entity as the media conversion device 500 as an example, in step 601, the control plane entity can receive and parse the control plane signaling sent by the media communication parties and the control plane signaling sent by other network elements, according to the received signaling. To obtain the media format adopted by the parties to the media communication.

The embodiment of the present invention provides a process in which a control plane obtains a media format adopted by both media communication parties through a media negotiation process in a circuit domain voice fallback scenario and in a media setup scenario. Of course, the circuit domain voice fallback scenario and the media setup scenario are two typical scenarios, but the embodiment of the present invention is not limited to obtaining the media format adopted by the media communication parties in the two scenarios.

In the circuit domain voice fallback scenario, when a user equipment of the media communication switches from E-UTRAN to UTRAN/GERAN, the circuit domain voice is dropped. In this scenario, the network element of the CS domain may send signaling to the media conversion device 500 that includes the circuit domain voice fallback indication information, where the circuit domain voice fallback indication information is used to indicate that the first user equipment is accessed from the packet domain. The network switches to the circuit domain access network, and further indicates the media format currently used by the user equipment. After receiving the signaling, the control plane entity of the media switching device 500 can determine the media format adopted by the first user equipment and the second user equipment according to the circuit domain voice fallback indication information.

In the media communication setup scenario, the user equipment requesting media communication first performs media negotiation. In the media negotiation process, signaling sent by the user equipment requesting media communication is transmitted to the media conversion device 500. The control plane entity of the media switching device 500 receives the signaling that the first user equipment and the second user equipment interact in the media negotiation process, and obtains the SDP carried in the signaling (English: Session Description Protocol, Chinese: session) Describe the protocol information, and determine the media format adopted by the first user equipment and the second user equipment according to the obtained SDP information of the first user equipment and the second user equipment.

FIG. 7 is a schematic diagram of a user plane processing process according to an embodiment of the present invention. The process can include:

Step 701: The user plane receives a notification message sent by the control plane, where the notification message is used to notify the user plane device to convert the media packet sent by the first user equipment to the media format of the first media format into a media format. Converting the media message in the EVS-compatible mode to the media message in the EMS-compatible mode, and converting the media message in the media format to the media format in the first media format;

Step 702: The user plane receives the media packet sent by the first user equipment in the first media format, and converts the media packet sent by the first user equipment to the media format in the first media format. Transmitting, to the second user equipment, a media message whose converted media format is an EVS compatible mode, for the media message in the EVS-compatible mode;

Step 703: The user plane receives the media packet sent by the second user equipment in the EVS-compatible mode, and converts the media packet sent by the second user equipment to the EMS-compatible mode into a media format. The media message in a media format sends the converted media format to the first user equipment as the media message in the first media format.

The EVS compatibility mode is an AMR-WB IO mode.

It should be noted that the timing of

steps

702 and 703 is not strictly required. During the media interaction between the first user device and the second user device, steps 702 and 703 may be performed multiple times.

If the first media format is incompatible with the second media format, the process of converting the media message sent by the user to the first user equipment may include: The media data of the first media format in the media packet of the user equipment is converted into the media data of the EVS compatible mode, and the EVS compatible with the ETS is encapsulated by the RTP packet format of the EVS or the RTP packet format of the EVS compatible mode. The media data of the mode of the EVS-compatible mode; the process of converting the media message sent by the second user equipment may include: converting the media data of the EVS compatible mode in the media message of the second user equipment into the first Media data in a media format, and using the RTP message format of the first media format to encapsulate the media data of the converted first media format.

Further, the media message format of the EVS compatible mode in the converted media format carries a media format field, where the media format field is used to notify the second user equipment to use the EVS compatibility mode to the second user equipment. The media data transmitted to the first user equipment is encoded. For example, in the RTP media packet encapsulated by the RTP format of the EVS, the CMR (Codec Mode Request, Chinese: Encoding Mode Request) field requests an EVS compatible mode, so that the second user equipment according to the CMR field. Content, encoding the media data sent to the first user device using the EVS compatibility mode.

If the first media format is AMR-WB, and the first media format is compatible with the second media format, in step 702, the process of converting the media message sent by the first user equipment may include: using EVS The RTP packet format or the RTP packet format of the AMR-WB encapsulates the media data in the media packet sent by the first user equipment; and the process of converting the media packet sent by the second user equipment may include: The media data in the media message sent by the second user equipment is encapsulated by using an RTP packet format of the AMR-WB. In the RTP media packet encapsulated by the RTP format of the EVS, the CMR field requests the EVS compatibility mode, so that the second user equipment sends the EVS compatible mode pair to the first user equipment according to the content of the CMR field. The media data is encoded.

As described in the foregoing embodiment, if the notification message carries the media conversion policy determined by the control plane, the user root The media conversion is performed according to the media conversion policy. If the media message is not carried in the notification message but carries the media format information used by the first user equipment and the second user equipment, the user plane may determine the media conversion policy according to the information.

As shown in the above description, in the embodiment of the present invention, on the control plane, the media format adopted by the first user equipment and the second user equipment of the media data interaction is determined, and a notification message is sent to the user plane, so that the user faces The media packets exchanged between the first user equipment and the second user equipment are converted, thereby implementing media interworking.

The control message sent to the user plane may include media format information respectively used by the first user equipment and the second user equipment, so that the user plane determines the media conversion policy according to the information; the control plane may also determine the media conversion policy. Then, the user is notified by a notification message to indicate how the user plane performs media message conversion. Whether the media conversion policy is determined by the control plane or the media conversion policy is determined by the user, after the media message of the first user equipment is converted, the second user equipment is notified by the converted message to adopt EVS compatibility. The mode encodes the media data sent to the first user equipment, so that although the control plane determines that the media format adopted by the second user equipment is the EVS main mode, on the user side, the media format of the first user equipment is implemented. The second user equipment is based on interworking between media data in an EVS compatible mode.

In one aspect, since the EVS main mode and the EVS compatibility mode are compatible with each other, the decoder of the second user equipment can correctly decode the media data of the EVS compatible mode, thereby implementing media interworking; on the other hand, indicating the second user by using the media message The device encodes the media data sent to the first user equipment by using the EVS compatibility mode, thereby implementing conversion or interworking between the first media format and the EVS compatible mode, and converting between the first media format and the EVS main mode. Compared with interworking, it can reduce the resource overhead of codec.

In order to more clearly understand the contents described in the embodiments of the present invention, the foregoing flow will be described in detail through three preferred embodiments with reference to FIG. 8 to FIG.

Preferred embodiment 1

The preferred embodiment 1 takes a SIP call as an example to describe the process of establishing a voice call and the process of interworking between the AMR-WB codec and the EVS main mode codec in the eSRVCC scenario.

The UE1 performs a voice call with the UE2 as a calling request, and the voice call establishment process can be as shown in FIG. 8, and mainly includes the following steps:

Step 801: The UE1 initiates a call request (SIP INVITE message in the figure), and carries the media capability adopted by the UE1 to the audio codec EVS main mode (EVS Primary).

The SDP information carried in the SIP INVITE message may include the following contents:

m=audio xxxxxx RTP/AVP 96 97 98

a=rtpmap:96 EVS/16000/1

a=fmtp:96 br=13.2-24.4;bw=nb-swb;max-red=220

a=rtpmap:97 AMR-WB/16000

a=fmtp:97 mode-change-capability=2;max-red=0

a=rtpmap:98 AMR/8000

a=fmtp:98 mode-change-capability=2;max-red=0

a=sendrecv

a=ptime:20

The SDP information indicates the media name and transmission port of the UE1 and the media attribute information. The media format adopted by the UE1 is EVS Primary. The meaning of the above SDP information can be found in the SDP protocol.

Step 802: The call request of the UE1 is forwarded to the call control network, and the call control network forwards the call request to the UE2. The media switching device 500 is included in the call control network.

Step 803: UE2 receives the call request, and UE2 adopts EVS Primary, and UE2 responds to UE1 with a response message (183 message in the figure), and the message carries EVS Primary codec capability.

The SDP information carried in the 183 message may include the following content:

m=audio xxxxxx RTP/AVP 96

a=rtpmap:96 EVS/16000/1

a=fmtp:96 br=13.2-24.4;bw=nb-swb;max-red=220

a=sendrecv

a=ptime:20

The above SDP information shows the media name and transmission port of the UE2 and the media attribute information, wherein the media format adopted by the UE2 is EVS Primary. The meaning of the above SDP information can be found in the SDP protocol.

Step 804: The call control network receives the response message of the UE2, and forwards the message to the UE1.

Step 805: 810: UE2 responds. After UE1 receives the response message of UE2, the media information between the calling and the called party is completed. The media interaction is then implemented using the negotiated EVS Primary media format, such as a voice or video call.

Thereafter, UE1 switches from E-UTRAN to UTRAN/GERAN, triggering circuit domain voice fallback, and the call control network performs the process shown in FIG. 9:

Step 901: 902: The control plane entity in the call control network (such as the control plane entity in the media conversion device 500) receives the signaling sent by the SRVCC IWF, where the indication information that the UE1 switches from the packet domain access network to the circuit domain access network is carried. Further, the indication information may further indicate that the media format currently used by the UE1 is AMR. The media format used by UE1 after access network switching is AMR. The control plane entity determines, according to the indication information, that UE1 and UE2 cannot directly communicate with each other.

Step 903: The control plane entity determines to convert the media data in the AMR format sent by the UE1 into the media data in the AMR-WB IO format, and sends the indication information indicating the determination result to the user plane entity by using the notification message.

Step 904: The user plane entity prepares a media codec conversion resource to implement media format conversion.

Step 905: The user plane entity performs a media format conversion process.

Specifically, the media format conversion process performed by the user plane entity may be as shown in FIG. 10a and FIG. 10b, including:

Receiving the AMR RTP packet sent by the UE1, obtaining the AMR encoded payload from the packet, and calling the AMR decoder to The encoded payload is decoded to recover the original speech signal, and then the original speech signal is encoded by an AMR-WB encoder to obtain an AMR-WB encoded payload. The AMR-WB encoded payload is encapsulated into an RTP packet according to the EVS RTP packet, and the encapsulated EVS RTP packet is sent to the EVS decoder of the UA of the UE2 side. The CMR field in the EVS RTP packet requests the codec mode of the AMR-WB.

After receiving the EVS RTP packet, the EVS decoder of the UA of the UE2 side finds that the payload of the packet is AMR-WB, and then decodes the media payload of the AMR-WB according to the EVS compatible mode, and decodes the voice signal. At the same time, it is found that the CMR field requests the encoding mode of the AMR-WB format, and then switches its own EVS encoder into the compatibility mode. The EVS encoder encodes the local voice signal according to the compatibility mode, and the encoded payload format is AMR-WB format, and then The AMR-WB encoded payload generated by the EVS encoder encoding is packetized into an RTP message according to the EVS compatible mode and sent to the media conversion device 500.

The user plane entity of the media conversion device 500 receives the ERP-compatible mode RTP media message, obtains the AMR-WB encoded payload, calls the AMR-WB decoder to decode the encoded payload, recovers the original voice signal, and then uses the AMR. The encoder encodes the original speech signal to obtain an AMR encoded payload. The AMR encoded payload is then encapsulated into an AMR RTP packet, and the encapsulated AMR RTP packet is sent to the SRVCC IWF. The AMR RTP message may be terminated by the SRVCC IWF or forwarded to the UE1 by the SRVCC IWF for termination.

In the above process, the part of the header of the AMR RTP packet related to the codec can be as shown in FIG. 11a, CMR=15, indicating a certain mode of requesting AMR; the format of the EVS RTP packet can be as shown in FIG. 11b. Show, where the RTP header is not included and only contains the exclusive part of EVScodec. The CMR field in the EVS RTP message has 8 bytes. As shown in Figure 11c, H indicates the header type identification bit, the T field is used to indicate the bandwidth of the EVS AMR-WB IO mode and the EVS Primary mode, and the D field is used to indicate The codec mode request, that is, the AMR-WB mode is requested through the D field. The ToC field in the EVS RTP message is used to indicate the type of frame encapsulated in the message, such as the frame of the EVS Primary (EVS Master Mode) or EVS AMR-WB IO (EVS compatible mode) voice coding mode.

Optionally, in the foregoing step 903, the control plane entity may directly notify the user plane entity of the indication information (such as the foregoing first indication information) indicating that the UE2 adopts the EVS main mode media format, and the user plane entity determines that the UE1 is to be The transmitted AMR format data is converted into EVS AMR-WB format data.

Optionally, in the foregoing step 904, the user plane entity may also encapsulate the AMR-WB encoding payload according to the RTP packet encapsulation format of the AMR-WB, that is, encapsulate the AMR-WB encoding payload according to RFC4867, and obtain the AMR-WB RTP. And sending the AMR-WB RTP packet to the second user equipment.

Optionally, in the foregoing step 904, the network element or the UE2 that uses the EVS codec may also encapsulate the AMR-WB encoded payload according to the RTP packet encapsulation format of the AMR-WB, and encapsulate the AMR-WB encoded payload. That is, the AMR-WB encoded payload is encapsulated according to RFC4867, and an AMR-WB RTP packet is obtained, and the packet is sent to the media conversion device 500.

Optionally, in the foregoing step 904, if the user plane entity receives the AMR-WB RTP packet (that is, the RFC4867 format), the AMR-WB encoded payload is directly obtained to decode the voice signal.

It can be seen from the foregoing description of the preferred embodiment that the AMR-WB codec can directly interwork with the EVS codec on the user plane, and on the other hand, the codec conversion strategy of the user plane can be independent of the media negotiation of the control plane. As a result, On the other hand, compared with the conversion between the AMR and the EVS main mode, the system resource overhead can be reduced, and the call processing specifications in the eSRVCC handover scenario can be improved.

Preferred embodiment two

The preferred embodiment 2 takes the SIP call as an example to describe the process of interworking between the AMR-WB codec and the EVS main mode codec after media negotiation.

The UE1 performs a voice call with the UE2 as a calling request, and the voice call establishment process can be as shown in FIG. 12, and mainly includes the following steps:

Step 1201: The UE1 initiates a call request (SIP INVITE message in the figure), and carries the media capability adopted by the UE1 to the audio codec EVS main mode (EVS Primary).

Step 1202: The call request of the UE1 is forwarded to the call control network, and the call control network forwards the call request to the UE2. Optionally, as shown by the dashed box in the figure, the call control network may add other additional codecs, such as G.729, to the call request. The media switching device 500 is included in the call control network.

Step 1203: UE2 receives the call request, and UE2 adopts G.729 codec, and UE2 responds to UE1 with a response message (183 message in the figure), and the message carries G.729 codec capability.

Step 1204: The call control network receives the response message of the UE2, and forwards the message to the UE1.

Step 1205: 1210: UE2 and UE1 perform message interaction based on the call control network. After UE1 receives the response message of UE2, the media information between the calling and the called party is completed.

Step 1211: The control plane entity of the media switching device 500 determines that the UE1 and the UE2 cannot directly interwork, and then selects the AMR-WB codec for the UE2, selects the AMR codec for the UE1, and indicates the indication result of the decision result (such as the foregoing second The indication information is sent to the user plane entity of the media conversion device 500 by the notification message, and the user plane entity prepares the media codec conversion resource to implement the media format conversion.

Step 1212: The user plane entity of the media conversion device 500 performs a media format conversion process.

Specifically, the media format conversion process performed by the user plane entity of the media conversion device 500 may include:

Receiving the G.729 RTP message sent by the UE1, obtaining the G.729 encoded payload from the message, calling the G.729 decoder to decode the encoded payload, recovering the original voice signal, and then encoding with the AMR-WB. The original speech signal is encoded to obtain an AMR-WB encoded payload. The AMR-WB encoded payload is encapsulated into an RTP packet according to the EVS RTP packet, and the encapsulated EVS RTP packet is sent to the EVS decoder of the UA of the UE2 side. The CMR field in the EVS RTP packet requests the codec mode of the AMR-WB.

The user plane entity of the media conversion device 500 receives the RTP media message in the EVS compatible mode, and obtains the AMR-WB code from the user. The code payload, the AMR-WB decoder is called to decode the encoded payload, the original speech signal is recovered, and then the original speech signal is encoded by the G.729 encoder to obtain the AMR encoded payload. The AMR encoded payload is then encapsulated into an AMR RTP packet, and the encapsulated AMR RTP packet is sent to the SRVCC IWF. The AMR RTP message may be terminated by the SRVCC IWF or forwarded to the UE1 by the SRVCC IWF for termination.

Optionally, in the foregoing step 1211, the control plane entity of the media switching device 500 may directly notify the user plane entity that the UE 2 uses the indication information of the EVS main mode media format (such as the foregoing first indication information), by the user. The face entity determines to convert the G.729 format data sent by UE1 into AMR-WB format data.

Optionally, in the foregoing step 1212, the user plane entity may also encapsulate the AMR-WB encoding payload according to the RTP packet encapsulation format of the AMR-WB, that is, encapsulate the AMR-WB encoding payload according to RFC4867, and obtain the AMR-WB RTP. The message is sent to the second user equipment.

Optionally, in the foregoing step 1212, the network element that uses the EVS codec or the UE2 may also encapsulate the AMR-WB encoded payload generated by the encoding according to the RTP packet encapsulation format of the AMR-WB, and encapsulate the AMR-WB encoded payload. That is, the AMR-WB encoded payload is encapsulated according to RFC4867, and an AMR-WB RTP packet is obtained, and the packet is sent to the media conversion device 500.

Optionally, in the foregoing step 1212, if the user plane entity receives the AMR-WB RTP packet (that is, the RFC4867 format), the AMR-WB encoded payload is directly obtained to decode the voice signal.

It can be seen from the description of the preferred embodiment 2 that the control plane of the call control network does not care about the resource capability of the call control network user plane, and the user plane decides whether to implement interworking with the EVS codec based on the AMR-WB, thereby Simplify the judgment of the control plane, that is, the control plane directly negotiates with the UE according to the EVS codec, without paying attention to how the user plane is implemented. This is especially meaningful when the control plane is separated from the user plane (that is, not on a single device). The control plane does not care about the resource situation of the user plane, and directly conducts service negotiation according to the actual service needs, and the user plane completes the media interworking. Time optimization.

Preferred embodiment three

The preferred embodiment 3 takes a SIP call as an example, and describes a process of implementing AMR-WB codec and EVS main mode codec interworking based on media message format conversion.

The UE1 performs a voice call with the UE2 as a calling request. The voice call establishment process can be as shown in FIG. 13 and mainly includes the following steps:

Step 1301: The UE1 initiates a call request (SIP INVITE message in the figure), and carries the media capability adopted by the UE1 to the audio codec EVS main mode (EVS Primary).

Step 1302: The call request of UE1 is forwarded to the call control network, and the call control network forwards the call request to UE2. Optionally, as shown by the dashed box in the figure, the call control network may add other additional codecs, such as AMR-WB, to the call request. The media switching device 500 is included in the call control network.

Step 1303: UE2 receives the call request, and UE2 adopts AMR-WB codec, and UE2 responds to UE1 with a response message (183 message in the figure), and the message carries AMR-WB codec capability.

Step 1304: The call control network receives the response message of the UE2, and forwards the message to the UE1.

Step 1305: 1310: UE2 and UE1 perform message interaction based on the call control network. After UE1 receives the response message of UE2, the media information between the calling and the called party is completed.

Step 1311: The control plane entity of the media conversion device 500 determines that the UE1 and the UE2 can directly communicate with each other, and then decides to perform packet format conversion by the user plane. For example, the notification message may be sent to the user plane entity, where the second indication information is carried in, which is used to indicate how to perform media packet format conversion.

Step 1312: The user plane entity of the media conversion device 500 performs a message format conversion process.

Specifically, the message format conversion process performed by the user plane entity of the media conversion device 500 may include:

Receiving the EVS RTP packet sent by the UE1, obtaining the AMR-WB encoded payload from the packet, and encapsulating the AMR-WB encoded payload into the RTP packet according to the AMR-WB RTP packet, and encapsulating the AMR- The WB RTP packet is sent to the UE2 side.

After receiving the EVS RTP packet, the EVS decoder of the UA of the UE2 side finds that the payload of the packet is AMR-WB, and then decodes the media payload of the AMR-WB according to the EVS compatible mode, and decodes the voice signal. The voice signal of the local end is encoded, and the encoded payload format is AMR-WB format, and then the AMR-WB encoded payload generated by the EVS encoder encoding is packaged into an RTP message according to the EVS compatible mode and sent to the media conversion device 500.

The user plane entity of the media conversion device 500 receives the ETP-compatible mode RTP media packet, obtains the AMR-WB encoded payload, encapsulates the AMR-encoded payload into an EVS RTP packet, and sends the encapsulated EVS RTP packet to the SRVCC IWF. The EVS RTP message may be terminated by the SRVCC IWF or forwarded to the UE1 by the SRVCC IWF for termination. The CMR field of the encapsulated EVS RTP message requests an EVS compatible mode, so that the UE1 encodes the media data sent to the UE2 in the AMR-WB mode.

Optionally, in the foregoing step 1311, the control plane entity of the media conversion device 500 may directly notify the user plane entity of the indication information indicating that the UE2 adopts the EVS main mode media format, and the user plane entity determines the format conversion of the media packet. the way.

Optionally, in the foregoing step 1312, the network element that uses the EVS codec or the UE1 may also encapsulate the AMR-WB encoded payload generated by the encoding according to the RTP packet encapsulation format of the AMR-WB, and encapsulate the AMR-WB encoded payload. That is, the AMR-WB encoded payload is encapsulated according to RFC4867, and an AMR-WB RTP packet is obtained, and the packet is sent to the media conversion device 500.

Optionally, in the foregoing step 1312, after the user plane entity decapsulates the AMR-WB encoding payload in the media packet sent by the second user equipment, the user may encapsulate the AMR according to the RTP packet encapsulation format of the AMR-WB. -WB-encoded payload, that is, the AMR-WB encoded payload is encapsulated according to RFC4867, and an AMR-WB RTP packet is obtained, and the packet is sent to the first user equipment.

Optionally, in the foregoing step 1312, if the user plane entity receives the AMR-WB RTP packet sent by the UE2 (that is, the RFC4867 format), the AMR-WB encoded payload is directly obtained to decode the voice signal.

As can be seen from the description of the foregoing preferred embodiment 3, when the user plane of the call control network is in the EVS codec format on the side of the AMR-WB codec format, there is no need to perform the media payload type conversion. RTP packet encapsulation format conversion can be performed. This method greatly saves the codec payload conversion resources.

The embodiment of the present invention further provides a media conversion control plane device and a media conversion based on the same technical concept. User plane device, and a media conversion device.

Referring to FIG. 14a or FIG. 14b, FIG. 14 is a schematic structural diagram of a control plane device 600 and a control plane device 610 according to an embodiment of the present invention. The control plane device 600 or the control plane device 610 may include a determination module 61 and a notification module 62, wherein:

a determining module 61, configured to determine that the first user equipment adopts a first media format, and the second user equipment that communicates with the first user equipment adopts a second media format, where the first media format is different from the second a media format, the second media format is an EVS main mode; the notification module 62 is configured to send a notification message to the user plane device, where the notification message is used to notify the user plane device to send the media sent by the first user equipment The media message in the format of the first media format is converted into the media message in the EVS-compatible mode, and the media message in the EVS-compatible mode sent by the second user equipment is converted into the media format as the first media. Formatted media message.

In an implementation manner, the notification message includes information of the first media format and information of the second media format.

In another implementation, as shown in FIG. 14b, the decision surface module 610 may further include a decision module 63. a decision module 63, configured to determine, according to the first media format and the second media format, that the user plane device communicates with the second user equipment by using an EVS compatible mode, using the first media format and the The first user equipment communicates. In this case, the notification message includes the result of the control plane device determination.

For the control plane device 600 or the control plane device 610, in the case that the first media format is AMR-WB, the notification message is used to notify the user plane device to use the RTP packet format of the EVS or the RTP of the AMR-WB. The packet format encapsulates the media data in the media packet sent by the first user equipment, and encapsulates the media data in the media packet sent by the second user equipment by using an RTP packet format of the AMR-WB.

FIG. 15a or FIG. 15b is a schematic structural diagram of a user plane device 700 and a user plane device 710 according to an embodiment of the present invention. The user plane device 700 or the user plane device 710 may include a receiving module 71, a first converting module 72, and a second converting module 73, where:

The receiving module 71 is configured to receive a notification message sent by the control plane device, where the notification message is used to notify the user plane device to convert the media packet sent by the first user equipment to a media format in a first media format. The media message in the EVS-compatible mode and the media message in the EMS-compatible mode sent by the second user equipment are converted into the media message in the media format.

The first conversion module 72 is configured to receive the media packet sent by the first user equipment in the media format of the first media format, and convert the media format sent by the first user equipment to the media packet in the first media format Transmitting, to the second user equipment, a media message whose converted media format is an EVS compatible mode, for a media message whose media format is an EVS compatible mode;

The second conversion module 73 is configured to receive the media message sent by the second user equipment in the EVS compatible mode, and convert the media message sent by the second user equipment to the EVS compatible mode into a media The media message in the first media format is sent to the first user equipment, and the converted media format is a media message in the first media format.

The media format of the media format in which the first conversion module 72 is converted into the EVS-compatible mode carries a media format field, where the media format field is used to notify the second user equipment to use the EVS compatibility mode to the second The user equipment encodes the media data sent by the first user equipment.

In another implementation manner, in the case that the information of the first media format and the information of the second media format are included in the notification message, as shown in FIG. 15b, the user plane device 710 may further include Decision module 74. The determining module 74 is configured to determine, according to the information of the first media format and the information of the second media format included in the notification message, to communicate with the second user equipment by using an EVS compatibility mode, using a first The media format communicates with the first user device.

In the control plane device 600 or the control plane device 610, the first conversion module 72 is further configured to encapsulate the converted EVS compatible mode by using the real-time transport protocol RTP message format of the EVS or the RTP message format of the EVS compatible mode. The second data conversion module 73 is further configured to encapsulate the converted media data of the first media format by using an RTP message format of the first media format.

In the foregoing control plane device 600 or the control plane device 610, in a case where the first media format is AMR-WB, the first conversion module 72 may be specifically used to use an RTP packet format of an EVS or an RTP report of an AMR-WB. The text format encapsulates the media data in the media message sent by the first user equipment; the second conversion module 73 may be specifically configured to encapsulate the media message sent by the second user equipment by using an RTP packet format of the AMR-WB. Media data.

FIG. 16 is a schematic structural diagram of a media conversion device 800 according to an embodiment of the present invention. The media conversion device 800 can include a control plane entity 81 and a user plane entity 82, wherein:

The control plane entity 81 is configured to determine that the first user equipment adopts the first media format, and the second user equipment that communicates with the first user equipment adopts a second media format, where the first media format is different from the first a media format, the second media format is an enhanced voice service EVS main mode; and sending a notification message to the user plane device, the notification message being used to notify the user plane device to send the media sent by the first user equipment The media message in the format of the first media format is converted into the media message in the EVS-compatible mode, and the media message in the EVS-compatible mode sent by the second user equipment is converted into the media format as the first media. Formatted media message;

The user plane entity 82 is configured to receive the media packet sent by the first user equipment in the media format of the first media format, and convert the media packet sent by the first user equipment to the media format in the first media format to The media format is an EVS-compatible mode media message, and the second user equipment sends the converted media format to the EVS-compatible mode media message; and the receiving the second user equipment sends the media format to the EVS compatibility mode. a media message, the media message sent by the second user equipment in the EVS-compatible mode is converted into a media message whose media format is the first media format, and the converted media is sent to the first user equipment. The media message in the format of the first media format.

The media format of the EVS-compatible mode in the media format of the user plane entity carries a media format field, where the media format field is used to notify the second user equipment to use the EVS compatibility mode to the second The user equipment encodes the media data sent by the first user equipment.

In an implementation manner, the notification message includes information of the first media format and the second media grid Information. In this case, the user plane entity 82 is further configured to determine, according to the information about the first media format included in the notification message and the information of the second media format, that the adopting an EVS compatibility mode and the first The two user equipments communicate, and communicate with the first user equipment by using the first media format.

In another implementation manner, the control plane entity 81 is further configured to determine, according to the first media format and the second media format, that the user plane device communicates with the second user equipment by using an EVS compatible mode, where The first media format communicates with the first user equipment. In this case, the notification message includes a result determined by the control plane device.

Further, the user plane entity 82 is further configured to encapsulate the converted EVS compatible mode media data by using an EVS real-time transport protocol RTP message format or an EVS compatible mode RTP message format; and, using the first media format The RTP message format encapsulates the converted media data of the first media format.

Further, in a case where the first media format is AMR-WB, the user plane entity 82 may be specifically configured to encapsulate, by using the RTP packet format of the EVS or the RTP packet format of the AMR-WB, the first user equipment to send Media data in the media message; and the media data in the media message sent by the second user equipment is encapsulated in an RTP message format of the AMR-WB.

In summary, in the embodiment of the present invention, when the format conversion of the EVS codec and other media codecs is performed, if the control plane has been negotiated to become the EVS main mode, the EVS is requested by the information interaction of the RTP message on the user plane. The codec is switched to the compatibility mode of the EVS, that is, when the AMR-W encoded media message can be received and correctly decoded, the EVS codec can also encode the media message according to the AMR-WB codec format, so that the EVS codec is decoded. The media message sent by the device can be correctly decoded by the AMR-WB decoder. Through the above implementation, the media conversion resource of the media codec conversion gateway can be saved when the basic interworking is satisfied.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

Although a preferred embodiment of the present invention has been described, once a person skilled in the art has learned the basic inventive concept, Additional changes and modifications can be made to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and the modifications and

It is apparent that those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

A media interworking method, the method comprising:

The control device determines that the first user equipment adopts the first media format, and the second user equipment that communicates with the first user equipment adopts a second media format, where the first media format is different from the second media format, The second media format is an enhanced voice service EVS main mode;

The control plane device sends a notification message to the user plane device, where the notification message is used to notify the user plane device to convert the media packet sent by the first user equipment to a media format of the first media format into a media format. The media message in the EVS-compatible mode and the media message in the EMS-compatible mode sent by the second user equipment are converted into the media message in the media format.
The method according to claim 1, wherein the notification message includes information of the first media format and information of the second media format.
The method of claim 1 wherein the method further comprises:

Determining, by the control plane device, that the user plane device communicates with the second user equipment by using an EVS compatibility mode according to the first media format and the second media format, using the first media format and the first A user equipment communicates;

The notification message includes a result determined by the control plane device.
The method of any of claims 1 to 3, further comprising:

The user plane device encapsulates the media data of the converted EVS compatible mode by using an ETP real-time transport protocol RTP message format or an ETP-compliant mode RTP message format of the EVS;

The user plane device encapsulates the converted media data of the first media format by using an RTP message format of the first media format.
The method according to any one of claims 1 to 3, wherein the first media format is a broadband adaptive multi-rate AMR-WB;

And the converting, by the first user equipment, the media message that is in the media format of the first media format into the media message in the EVS compatible mode, where:

The user plane device encapsulates the media data in the media packet sent by the first user equipment by using an RTP packet format of the EVS or an RTP packet format of the AMR-WB;

And converting, by the second user equipment, the media message in the EVS-compatible mode to the media message in the media format, including:

The user plane device encapsulates media data in the media packet sent by the second user equipment by using an RTP packet format of the AMR-WB.
A media interworking method, comprising:

The user plane device receives a notification message sent by the control plane device, where the notification message is used to notify the user plane device that Transmitting, by the first user equipment, a media message in a first media format to a media message in an EVS-compatible mode, and a media report in an EVS-compatible mode in a media format sent by the second user equipment Converting the text into a media message whose media format is the first media format;

The user plane device receives the media packet sent by the first user equipment in the first media format, and converts the media packet sent by the first user equipment to the media format in the first media format. Transmitting, to the second user equipment, a media message whose converted media format is an EVS compatible mode, for the media message in the EVS-compatible mode;

The user plane device receives the media message sent by the second user equipment in the EVS compatible mode, and converts the media message sent by the second user equipment to the EMS compatible mode into a media format. The media message in a media format sends the converted media format to the first user equipment as the media message in the first media format.
The method according to claim 6, wherein the media message in the EVS compatible mode is a media format field, and the media format field is used to notify the second user equipment. The EVS compatibility mode encodes media data sent by the second user equipment to the first user equipment.
The method according to claim 6 or 7, wherein the notification message includes information of the first media format and information of the second media format;

The method further includes:

Determining, by using the first media format information and the information of the second media format, that the user plane device communicates with the second user equipment by using an EVS compatible mode, using the first media. The format communicates with the first user device.
The method according to any one of claims 6 to 8, wherein the method further comprises:

The user plane device encapsulates the media data of the converted EVS compatible mode by using an ETP real-time transport protocol RTP message format or an ETP-compliant mode RTP message format of the EVS;

The user plane device encapsulates the converted media data of the first media format by using an RTP message format of the first media format.
The method of claim 6, wherein the first media format is a broadband adaptive multi-rate AMR-WB;

The user plane device converts the media message that is sent by the first user equipment to the media format of the first media format into a media message whose media format is an EVS compatible mode, and includes:

The user plane device encapsulates the media data in the media packet sent by the first user equipment by using an RTP packet format of the EVS or an RTP packet format of the AMR-WB;

The user plane device converts the media message that is sent by the second user equipment to the EMS-compatible mode into a media message whose media format is the first media format, and includes:

The user plane device encapsulates media data in the media packet sent by the second user equipment by using an RTP packet format of the AMR-WB.
A media interworking method, comprising:

The control plane entity in the media conversion device determines that the first user equipment adopts the first media format, and the second user equipment that communicates with the first user equipment adopts the second media format, where the first media format is different from the a second media format, where the second media format is an enhanced voice service EVS main mode;

The control plane entity sends a notification message to the user plane entity in the media conversion device, where the notification message is used to notify the user plane entity to send the media format sent by the first user equipment to the media in the first media format. The message is converted into a media message whose media format is an EVS compatible mode, and a media message whose media format is an EVS compatible mode sent by the second user equipment is converted into a media message whose media format is the first media format;

The user plane entity receives the media packet sent by the first user equipment in the first media format, and converts the media packet sent by the first user equipment to the media format in the first media format. Transmitting, to the second user equipment, a media message whose converted media format is an EVS compatible mode, for the media message in the EVS-compatible mode;

The user plane entity receives the media message sent by the second user equipment in the EVS compatible mode, and converts the media message sent by the second user equipment to the EMS compatible mode into a media format. The media message in a media format sends the converted media format to the first user equipment as the media message in the first media format.
The method according to claim 11, wherein the media message in the EVS compatible mode is a media format field, and the media format field is used to notify the second user equipment. The EVS compatibility mode encodes media data sent by the second user equipment to the first user equipment.
The method according to claim 11 or 12, wherein the notification message includes information of the first media format and information of the second media format;

The method further includes:

The user plane entity determines, according to the information of the first media format and the information of the second media format that are included in the notification message, to communicate with the second user equipment by using an EVS compatible mode, using the first media. The format communicates with the first user device.
The method of claim 11 or 12, wherein the method further comprises:

Determining, by the control plane entity, that the user plane entity communicates with the second user equipment by using an EVS compatible mode according to the first media format and the second media format, using the first media format and the first A user equipment communicates;

The notification message includes a result determined by the control plane entity.
The method according to any one of claims 11 to 14, wherein the method further comprises:

The user plane entity encapsulates the media data of the converted EVS compatible mode by using an ETP real-time transport protocol RTP message format or an ETS-compliant mode RTP message format;

The user plane entity encapsulates the converted media data of the first media format by using an RTP message format of the first media format.
The method of claim 11, wherein the first media format is a broadband adaptive multi-rate AMR-WB;

And the converting, by the first user equipment, the media message that is in the media format of the first media format into the media message in the EVS compatible mode, where:

The user plane entity encapsulates media data in the media packet sent by the first user equipment by using an RTP packet format of the EVS or an RTP packet format of the AMR-WB;

And converting, by the second user equipment, the media message in the EVS-compatible mode to the media message in the media format, including:

The user plane entity encapsulates the media data in the media packet sent by the second user equipment by using an RTP packet format of the AMR-WB.
A control surface device, comprising:

a determining module, configured to determine that the first user equipment adopts a first media format, and the second user equipment that communicates with the first user equipment adopts a second media format, where the first media format is different from the second media Format, the second media format is an enhanced voice service EVS main mode;

a notification module, configured to send a notification message to the user plane device, where the notification message is used to notify the user plane device to convert the media message sent by the first user equipment to a media format of the first media format into a media format The media message in the EVS-compatible mode and the media message in the EMS-compatible mode sent by the second user equipment are converted into the media message in the media format.
The control plane device according to claim 17, wherein the notification message includes information of the first media format and information of the second media format.
The control surface device of claim 17, further comprising:

a decision module, configured to determine, according to the first media format and the second media format, that the user plane device communicates with the second user equipment by using an EVS compatible mode, using the first media format and the first A user equipment communicates;

The notification message includes a result determined by the control plane device.
The control plane device according to any one of claims 18 to 19, wherein the first media format is a broadband adaptive multi-rate AMR-WB;

The notification message is used to notify the user plane device to encapsulate the media data in the media message sent by the first user equipment by using the RTP message format of the EVS or the RTP message format of the AMR-WB, and use the AMR-WB The RTP message format encapsulates the media data in the media message sent by the second user equipment.
A user plane device, comprising:

a receiving module, configured to receive a notification message sent by the control plane device, where the notification message is used to notify the user plane device to convert the media message sent by the first user equipment to a media format in a first media format Converting the media message in the EVS-compatible mode to the media message in the EMS-compatible mode and the media message in the media format as the media format in the first media format;

a first conversion module, configured to receive, by the first user equipment, a media packet whose media format is the first media format, Transmitting, by the first user equipment, a media message with a media format of the first media format to a media message with a media format of an EVS compatible mode, and transmitting, by the second user equipment, the converted media format to an EVS compatible mode. Media message;

a second conversion module, configured to receive a media message sent by the second user equipment in an EVS-compatible mode, and convert the media message sent by the second user equipment to an EVS-compatible mode into a media format Sending, to the first user equipment, a media message whose converted media format is the first media format, for the media message in the first media format.
The user plane device of claim 21, wherein the media message formatted by the first conversion module in the EVS compatible mode carries a media format field, where the media format field is used to notify the The second user equipment encodes the media data sent by the second user equipment to the first user equipment by using an EVS compatibility mode.
The user plane device according to claim 21 or 22, wherein the notification message includes information of the first media format and information of the second media format;

The user plane device further includes:

a decision module, configured to determine, according to the information of the first media format and the information of the second media format included in the notification message, to communicate with the second user equipment by using an EVS compatible mode, using the first media The format communicates with the first user device.
A user plane device according to any one of claims 21 to 23, characterized in that

The first conversion module is further configured to encapsulate the media data of the converted EVS compatible mode by using an RTP message format of an EVS or an RTP message format of an EVS compatible mode;

The second conversion module is further configured to encapsulate the converted media data of the first media format by using an RTP message format of the first media format.
The user plane device according to claim 21, wherein the first media format is a broadband adaptive multi-rate AMR-WB;

The first conversion module is configured to encapsulate the media data in the media packet sent by the first user equipment by using an RTP packet format of the EVS or an RTP packet format of the AMR-WB;

The second conversion module is configured to encapsulate the media data in the media packet sent by the second user equipment by using an RTP packet format of the AMR-WB.
A media conversion device, comprising:

a control plane entity, configured to determine that the first user equipment adopts the first media format, and the second user equipment that communicates with the first user equipment adopts a second media format, where the first media format is different from the second a media format, the second media format is an enhanced voice service EVS main mode; and sending a notification message to the user plane device, the notification message being used to notify the user plane device of the media format sent by the first user equipment Converting the media message in the first media format to the media message in the EVS-compatible mode, and converting the media message in the EVS-compatible mode sent by the second user device to the media format as the first media format Media message;

a user plane entity, configured to receive, by the first user equipment, a media packet whose media format is the first media format, Transmitting, by the first user equipment, a media message with a media format of the first media format to a media message with a media format of an EVS compatible mode, and transmitting, by the second user equipment, the converted media format to an EVS compatible mode. And receiving the media message sent by the second user equipment in an EVS-compatible mode, and converting the media message sent by the second user equipment into an EVS-compatible mode into a media format Sending, to the first user equipment, a media message whose converted media format is the first media format, for the media message in the first media format.
The media conversion device according to claim 26, wherein the media message formatted by the user plane entity in the EVS compatible mode carries a media format field, where the media format field is used to notify the The second user equipment encodes the media data sent by the second user equipment to the first user equipment by using an EVS compatibility mode.
The media conversion device according to claim 26 or 27, wherein the notification message includes information of the first media format and information of the second media format;

The user plane entity is further configured to determine, according to the information about the first media format and the information of the second media format that are included in the notification message, that the adopting an EVS compatibility mode and the second user equipment Communicating, using the first media format to communicate with the first user equipment.
The media conversion device according to claim 26 or 27, wherein the control plane entity is further configured to determine, according to the first media format and the second media format, that the user plane device adopts an EVS compatibility mode. Communicating with the second user equipment, and communicating with the first user equipment by using the first media format;

The notification message includes a result determined by the control plane device.
The media conversion device according to any one of claims 26 to 27, wherein the user plane entity is further configured to use an RTP packet format of an EVS real-time transport protocol or an RTP packet format of an EVS compatible mode. And converting the obtained media data of the EVS compatible mode; and packaging the converted media data of the first media format by using an RTP message format of the first media format.
The media conversion device according to claim 26, wherein the first media format is a broadband adaptive multi-rate AMR-WB;

The user plane entity is configured to encapsulate the media data in the media packet sent by the first user equipment by using an RTP packet format of the EVS or an RTP packet format of the AMR-WB; and using the RTP of the AMR-WB The packet format encapsulates the media data in the media packet sent by the second user equipment.