CN105100046A - Media exchange method and device thereof - Google Patents

Abstract

The invention discloses a media intercommunication method and a device thereof. In the present invention, the control plane determines that the first user equipment adopts the first media format, the second user equipment communicating with the first user equipment adopts the second media format, and the second media format is the EVS main mode, and notifies the user The surface device converts the media packet sent by the first user equipment in the first media format into a media packet in the EVS compatible mode and converts the media packet sent by the second user equipment in the EVS compatible mode The media format is converted into a media message in the first media format, thereby realizing intercommunication between the media format of the first user and the media data of the second user based on the EVS compatibility mode.

Description

A media interworking method and device thereof

technical field

The present invention relates to the communication field, in particular to a media interworking method and a device thereof.

Background technique

In the field of communication, such as real-time call service, before the call is established, the calling party and the called party need to exchange 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, so as to determine the media data encoding format used when communicating with the peer end.

The 3GPP standard newly defines the EVS (Enhanced Voice Services, enhanced voice service) codec scheme, see 3GPP26.445 for details. The encoding and decoding scheme has the characteristics of good encoding and decoding quality and high encoding rate, and can be compatible with the encoding and decoding rate of AMR-WB (Adaptive Multi-Rate-Wideband, wideband adaptive multi-rate). The EVS codec scheme has two modes: the main mode (primary) and the compatibility mode, and the compatibility mode is also called the AMR-WBIO mode. When using the EVS codec scheme, only one of the main mode or compatibility mode can be used.

Single Radio Voice Call Continuity (SingleRadioVoiceCallContinuity, SRVCC) service means that the user roams from E-UTRAN (Evolved Universal Terrestrial Radio Access Network, Evolved Universal Terrestrial Radio Access Network) to UTRAN (UMTS Terrestrial Radio Access Network, Universal Mobile Telecommunications System Radio Access Network)/ During GERAN (GSMEDGE RadioAccessNetwork, GSMEDGE wireless access network), through the switching process of the terminal and network equipment, the user's call is kept uninterrupted.

After network switching, users in UTRAN/GERAN use AMR (AdaptiveMulti-Rate, Adaptive Multi-Rate) or other codec modes to encode and decode media data, and users still residing in the E-UTRAN network use EVS main mode to Media data is encoded and decoded. The codec mode used in UTRAN/GERAN and the EVS main mode used in E-UTRAN network are incompatible with each other and cannot realize intercommunication.

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

Contents of the invention

Embodiments of the present invention provide a media interworking method and device thereof, which are used to realize media interworking between the EVS main mode and other codec modes.

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

The control plane device determines that the first user equipment adopts the first media format, and the second user equipment communicating with the first user equipment adopts the second media format, where the first media format is different from the second media format, The second media format is 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 in the first media format into a media message in the media format of A media packet in the EVS compatibility mode and converting the media packet sent by the second user equipment in the media format in the EVS compatibility mode into a media packet in the first media format.

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

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, according to the first media format and the second media format, that the user plane device Communicating with the second user equipment in an EVS compatible mode, and communicating with the first user equipment in the first media format; wherein the notification message includes a result determined by the control plane device.

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

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

The user plane device uses the RTP packet format of the first media format to encapsulate the converted media data in the first media format.

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

The converting the media message sent by the first user equipment in the first media format into a media message in the EVS compatible mode includes:

The user plane device uses the RTP message format of EVS or the RTP message format of AMR-WB to encapsulate the media data in the media message sent by the first user equipment;

The converting the media message whose media format is the EVS compatibility mode sent by the second user equipment into a media message whose media format is the first media format includes:

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

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

The user plane equipment receives a notification message sent by the control plane device, where the notification message is used to notify the user plane equipment to convert the media message sent by the first user equipment in the first media format into a media format of EVS A media packet in a compatibility mode and converting a media packet in an EVS compatibility mode sent by the second user equipment into a media packet in a 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 in the first media format into a media format is a media message in EVS compatibility mode, and sends a media message in which the converted media format is EVS compatibility mode to the second user equipment;

The user plane device receives the media packet sent by the second user equipment in the media format of the EVS compatible mode, and converts the media packet sent by the second user equipment in the media format of the EVS compatible mode into a media format of the first A media message in a media format, sending the converted media message in the first media format to the first user equipment.

With reference to the second aspect, in the first possible implementation manner of the second aspect, the converted media format is carried in the media message in the EVS compatibility mode, and the media format field is used to notify all The second user equipment uses the EVS compatibility mode to encode the media data sent by the second user equipment to the first user equipment.

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

The method further includes: the user plane device determines, according to the information of the first media format and the information of the second media format included in the notification message, to use the EVS compatibility mode to communicate with the second user equipment. Communicating, using a first media format to communicate with the first user equipment.

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

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

The user plane device uses the RTP packet format of the first media format to encapsulate the converted media data in the first media format.

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 whose media format is the first media format sent by the first user equipment into a media message whose media format is EVS compatible mode, including:

The user plane device uses the RTP message format of EVS or the RTP message format of AMR-WB to encapsulate the media data in the media message sent by the first user equipment;

The user plane device converts the media message sent by the second user equipment in the EVS compatibility mode into a media message in the first media format, including:

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

In a third aspect, a method for media interworking is provided, the 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 communicating with the first user equipment adopts the second media format, where the first media format is different from the A second media format, 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 that the media format sent by the first user equipment is media in the first media format Converting the message into a media message whose media format is EVS compatible mode and converting the media message sent by the second user equipment whose media format is EVS 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 first media format, and converts the media packet sent by the first user equipment in the first media format into a media format is a media message in EVS compatibility mode, and sends a media message in which the converted media format is EVS compatibility mode to the second user equipment;

The user plane entity receives the media packet sent by the second user equipment in the media format of the EVS compatible mode, and converts the media packet sent by the second user equipment in the media format of the EVS compatible mode into a media format of the first A media message in a media format, sending the converted media message in the first media format to the first user equipment.

With reference to the third aspect, in the first possible implementation manner of the third aspect, the converted media format is carried in the media message in the EVS compatibility mode, and the media format field is used to notify all The second user equipment uses the EVS compatibility mode to encode the media data sent by the second user equipment to the first user equipment.

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 notification message includes information about the first media format and the second information on media formats;

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 included in the notification message, to use the EVS compatibility mode to communicate with the second user equipment. Communicating, using a first media format to communicate with the first user equipment.

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 uses the EVS compatibility mode to communicate with the second user equipment, 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.

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

The user plane entity uses the real-time transport protocol RTP message format of EVS or the RTP message format of EVS compatible mode to encapsulate the converted media data in EVS compatible mode;

The user plane entity uses the RTP packet format of the first media format to encapsulate the converted media data in 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 converting the media message sent by the first user equipment in the first media format into a media message in the EVS compatible mode includes:

The user plane entity uses the RTP packet format of EVS or the RTP packet format of AMR-WB to encapsulate the media data in the media packet sent by the first user equipment;

The converting the media message whose media format is the EVS compatibility mode sent by the second user equipment into a media message whose media format is the first media format includes:

The user plane entity uses the AMR-WB RTP packet format to encapsulate the media data in the media packet sent by the second user equipment.

In a fourth aspect, a control plane device is provided, and the control plane device includes:

A determining module, configured to determine that the first user equipment adopts a first media format, and that a second user equipment communicating with the first user equipment adopts a second media format, wherein the first media format is different from the second media Format, the second media format is 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 device in the first media format into a media message in the media format of A media packet in the EVS compatibility mode and converting the media packet sent by the second user equipment in the media format in the EVS compatibility mode into a media packet in the first media format.

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

With reference to the fourth aspect, in a second possible implementation manner of the fourth aspect, the control plane device further includes: a decision module, configured to determine the user's The plane device communicates with the second user equipment in an EVS compatible mode, and communicates with the first user equipment in 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 of the fourth aspect, the first media format is AMR-WB;

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

In a fifth aspect, a user plane device is provided, and 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 in the first media format into a media format It is a media packet in the EVS compatible mode and converting the media packet sent by the second user equipment in the media format in the EVS compatible mode into a media packet in the first media format;

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

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

With reference to the fifth aspect, in the first possible implementation of the fifth aspect, the media format converted by the first conversion module is carried in the media message in the EVS compatibility mode, and the media format field is and notifying the second user equipment to use the EVS compatibility mode to encode the media data sent by the second user equipment to the first user equipment.

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

The user plane equipment also 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 use the EVS compatible mode to communicate with the second user equipment, and to use the first media A format is communicated with the first user equipment.

With reference to the fifth aspect or the first or second possible implementation of the fifth aspect, in the third possible implementation of the fifth aspect, the first conversion module is further configured to use EVS for real-time transmission The protocol RTP message format or the RTP message format of the EVS compatible mode encapsulates the converted media data in the EVS compatible mode; the second conversion module is also used to use the RTP message format of the first media format to encapsulate the described The converted media data in 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 specifically configured to use the RTP message format of EVS or the RTP message format of AMR-WB to encapsulate the media data in the media message sent by the first user equipment;

The second conversion module is specifically configured to use the AMR-WB RTP message format to encapsulate the media data in the media message sent by the second user equipment.

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

A control plane entity, configured to determine that the first user equipment adopts a first media format, and that a second user equipment communicating with the first user equipment adopts a second media format, where the first media format is different from the second media format. A media format, where the second media format is the enhanced voice service EVS main mode; and, sending a notification message to the user plane device, where the notification message is used to notify the user plane device of the media format sent by the first user device Converting a media packet in the first media format into a media packet whose media format is EVS compatible mode and converting a media packet sent by the second user equipment with a media format that is EVS compatible mode into a media format that is the first media format media reports;

A user plane entity, configured to receive a media packet sent by the first user equipment in the first media format, and convert the media packet sent by the first user equipment in the first media format into a media The format is a media message in EVS compatible mode, sending the converted media message to the second user equipment in an EVS compatible mode; and receiving the media message sent by the second user equipment in an EVS compatible mode A media message, converting the media message sent by the second user equipment with the media format of the EVS compatible mode into a media message with the media format of the first media format, and sending the converted media format to the first user equipment It is a media message in the first media format.

With reference to the sixth aspect, in the first possible implementation manner of the sixth aspect, the media format of the media packet converted by the user plane entity is an EVS compatible mode, and the media format field is carried in the media format field, and the media format field is used Notifying the second user equipment to use the EVS compatibility mode to encode the media data sent by the second user equipment to the first user equipment.

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 notification message includes information about the first media format and the second information on media formats;

The user plane entity is further 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, that the EVS compatible mode is used to communicate with 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, according to the first media format and the The second media format determines that the user plane equipment communicates with the second user equipment in an EVS compatible mode, and communicates with the first user equipment in 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 one of the first possible implementation manners of the sixth aspect, in a fourth possible implementation manner of the sixth aspect, the user plane entity is further configured to use the real-time transport protocol of EVS RTP packet format or the RTP packet format of the EVS compatibility mode encapsulates the converted media data in the EVS compatible mode; and uses the RTP packet format of the first media format to encapsulate the converted media in 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; the user plane entity is specifically configured to use the EVS RTP packet format or AMR-WB encapsulate the media data in the media packet sent by the first user equipment in the RTP packet format of the AMR-WB; and encapsulate the media data in the media packet sent by the second user equipment in the RTP packet format of AMR-WB.

In a seventh aspect, a control plane device is provided, and the control plane device includes: an interface, a processing unit, and a memory; the processing unit is used to control the operation of the control plane device; the memory is used to provide the processing unit with providing instructions and data; each component of the control plane device is coupled together through a bus system;

The processing unit is specifically used to read the program of the memory, and execute the following process:

determining that the first user equipment adopts a first media format, and that a second user equipment communicating with the first user equipment adopts a second media format, where the first media format is different from the second media format, and the first 2. The media format is EVS main mode;

Sending a notification message to the user plane equipment, where the notification message is used to notify the user plane equipment to convert the media packet sent by the first user equipment in the first media format into the media in the EVS compatible mode message and converting the media message sent by the second user equipment with the media format of the EVS compatibility mode into the media message with the media format of the first media format.

Wherein, the above-mentioned process executed by the processing unit is similar to the specific implementation process of the above-mentioned first aspect, and will not be repeated here.

According to an eighth aspect, a user plane device is provided, and the user plane device includes: an interface, a processing unit, and a memory; the processing unit is used to control the operation of the user plane device; the memory is used to provide the processing unit with providing instructions and data; each component of the user plane device is coupled together through a bus system;

The processing unit is specifically used to read the program of the memory, and execute the following process:

receiving 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 in the first media format into a media message in the EVS compatible mode a media packet and converting a media packet whose media format is the EVS compatibility mode sent by the second user equipment into a media packet whose media format is the first media format;

Receiving the media message sent by the first user equipment in the media format of the first media format, and converting the media message sent by the first user equipment in the media format of the first media format into a media message in the EVS compatible mode A media message, sending the converted media message to the second user equipment in an EVS compatible mode;

Receiving the media message sent by the second user equipment in the media format of the EVS compatible mode, and converting the media message sent by the second user equipment in the media format of the EVS compatible mode into a media message in the first media format A message, sending a media message in which the converted media format is the first media format to the first user equipment.

Wherein, the above process performed by the processing unit is similar to the specific implementation process of the second aspect above, and will not be repeated here.

In a ninth aspect, a media conversion device is provided, and the media conversion device includes: an interface, a processing unit, and a memory; the processing unit is used to control the operation of the user plane device; the memory is used to provide the processing unit with providing instructions and data; each component of the user plane device is coupled together through a bus system;

The processing unit is specifically used to read the program of the memory, and execute the following process:

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

Sending a notification message to the user plane entity, where the notification message is used to notify the user plane entity to convert the media packet sent by the first user equipment in the first media format into the media in the EVS compatibility mode A message and converting a media message whose media format is the EVS compatibility mode sent by the second user equipment into a media message whose media format is the first media format;

The user plane entity receives the media message sent by the first user equipment in the first media format, and converts the media message sent by the first user equipment in the first media format into a media message in the EVS format A media packet in a compatible mode, sending the converted media packet to the second user equipment in an EVS compatible mode;

The user plane entity receives the media packet sent by the second user equipment in the media format of the EVS compatible mode, and converts the media packet sent by the second user equipment in the media format of the EVS compatible mode into a media format of the first media format of the media packet, and send the converted media packet to the first user equipment in the first media format.

Wherein, the above process performed by the processing unit is similar to the specific implementation process of the above third aspect, and will not be repeated here.

In this embodiment of the present invention, on the control plane, it is determined that the first user equipment adopts the first media format, and the second user equipment communicating with the first user equipment adopts the second media format, wherein the first media format is different from The second media format, the second media format is the EVS main mode, and the user plane equipment is notified to convert the media message sent by the first user equipment in the first media format into a media format compatible with EVS mode and convert the media message sent by the second user equipment with the media format of the EVS compatible mode into a media message with the media format of the first media format, so that the user plane can send the notification message to the first media message according to the notification message. The media packets exchanged between the user equipment and the second user equipment are converted, so as to realize media intercommunication.

Description of drawings

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

FIG. 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 provided by an embodiment of the present invention;

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

FIG. 5 is a schematic structural diagram of a media conversion device 500 provided by an embodiment of the present invention;

FIG. 6 is a schematic diagram of a control plane processing flow provided by an embodiment of the present invention;

FIG. 7 is a schematic diagram of a user plane processing flow provided by an embodiment of the present invention;

FIG. 8 is a schematic diagram of a media negotiation signaling process in an embodiment of the present invention;

FIG. 9 is a schematic flow diagram of interworking between AMR-WB encoding and decoding and EVS main mode encoding and decoding in the eSRVCC scenario in the embodiment of the present invention;

FIG. 10a and FIG. 10b are schematic diagrams of the media format conversion process in the embodiment of the present invention, respectively;

FIG. 11a, FIG. 11b and FIG. 11c are schematic diagrams of message formats in embodiments of the present invention;

FIG. 12 is a schematic diagram of a media negotiation signaling process in another embodiment of the present invention;

FIG. 13 is a schematic flow diagram of interworking between AMR-WB encoding and decoding and EVS main mode encoding and decoding in an eSRVCC scenario in another embodiment of the present invention;

FIG. 14a and FIG. 14b are schematic structural diagrams of a control plane device 600 and a control plane device 610 provided by another embodiment of the present invention, respectively;

FIG. 15a and FIG. 15b are schematic structural diagrams of a user plane device 700 and a user plane device 710 provided by another embodiment of the present invention, respectively;

Fig. 16 is a schematic structural diagram of a media conversion device 800 provided by another embodiment of the present invention.

Detailed ways

Embodiments of the present invention provide a media interworking method and device thereof. In the embodiment of the present invention, when media data in the EVS codec mode is converted to media data in other media codec modes, if the media negotiation result on the control plane is that the second user equipment adopts the EVS main mode and the first user equipment adopts the For other modes that are incompatible with the EVS main mode, on the user plane, request the second user equipment to switch the EVS main mode to the EVS compatible mode through a media message, so that the media message sent by the EVS codec of the second user equipment Can be correctly decoded by the AMR-WB decoder on the user plane. Through the above implementation, under the condition of satisfying the basic intercommunication, system resources required for the media codec conversion process can be saved.

Embodiments of the present invention can be applied to fields such as VoLTE (VoiceoverLTE, referring to voice services carried by IP channels provided by LTE wireless network and EPC core network), or any field using EVS codec scheme for media intercommunication.

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments . Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The following are some of the embodiments of the present invention, which are intended to provide a basic understanding of the present invention, but are not intended to identify the key or decisive elements of the present invention or to limit the scope of protection. According to the technical solution of the present invention, without changing the essence and spirit of the present invention, other implementation modes can be obtained by replacing each other.

The following describes the embodiments of the present invention in detail by taking the application of the embodiments of the present invention in the VoLTE field as an example.

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 LTE wireless network, EPC (Evolved Packet Core, Evolved Packet Core Network), and IMS (IP Multimedia Subsystem, IP Multimedia Subsystem).

The EPC is connected to the IMS as an access network, and the IMS provides comprehensive services such as voice and multimedia for user equipment, and a CS (Circuit Switch, circuit switched) domain is an access network of the IMS. SCCAS (service centralization and continuity application server, service centralization and continuity application server) in IMS acts as SIPUA (SessionInitiationProtocolUserAgent, session initiation protocol user agent) of UE (UserEquipment, user equipment, terminal) to connect UE in CS domain to IMS domain and complete IMS Session establishment and control. P-CSCF (Proxy-CallSessionControlFunction, proxy call session control function) is the first node visited by UE in IMS.

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

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

Both UE1 and UE2 are accessed by E-UTRAN when the call is established. Both 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 process. The bearer paths of UE1 and UE2 before and after SRVCC handover are shown in FIG. 1 .

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

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

eSRVCC (English: enhancedSRVCC, Chinese: enhanced SRVCC) is an enhancement to SRVCC, and its network architecture is similar to SRVCC. eSRVCC optimizes the networking of SRVCC, in which there are ATCF (English: accesstransfercontrolfunction, Chinese: access transfer control function) functional entity and ATGW (English: accesstransfergateway, Chinese: access transfer gateway) functional entity. The ATCF and the ATGW are logically separated. The ATCF is the functional entity of the control plane, and the ATGW is the functional entity of the user plane. The two can be deployed separately or combined. If the ATCF and the ATGW are deployed together, the equipment deployed with these two functional entities can be expressed as ATCF/ATGW. ATCF/ATGW is generally deployed together with P-CSCF. For example, ATCF/ATGW is set on P-CSCF entity and I-CSCF (English: Interrogating-CSCF, Chinese: Query CSCF)/S-CSCF (English: Serving -CSCF, in Chinese: between serving CSCF).

Both UE1 and UE2 are accessed by E-UTRAN when the call is established. Both 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 process. Figure 2 shows the bearer paths of UE1 and UE2 before and after eSRVCC handover.

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

It can be seen from the above system architecture that when the media formats used by the user equipments for media interaction are different, media conversion needs to be performed to realize media intercommunication.

In order to realize media intercommunication, one embodiment of the present invention provides a control plane device 300, another embodiment provides a user plane device 400, and another embodiment provides a media conversion The device 500 can be applied to the above network architecture. The control plane device 300 can be obtained by transforming the ATCF entity in the above architecture. The user plane device 400 can be obtained by transforming 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 devices performing media interaction can perform media intercommunication when the media formats adopted by each other are incompatible. The media conversion device 500 includes a control plane entity and a user plane entity, that is, includes both control plane functions and user plane functions.

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 , it is a control plane device 300 provided by an embodiment of the present invention. The device may include: an interface 301 , a processing unit 302 and a memory 303 . The processing unit 302 is used to control the operation of the control plane device 300 ; the memory 303 may include a read-only memory and a random access memory, and is used to provide instructions and data to the processing unit 302 . A portion of memory 303 may also include non-volatile random access memory (NVRAM). Various components of the control plane device 300 are coupled together through a bus system, wherein the bus system 309 includes a power bus, a control bus, and a status signal bus in addition to a data bus. However, for clarity of illustration, the 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, each step of the control plane processing flow may be completed by an integrated logic circuit of hardware in the processing unit 302 or an instruction in the form of software. The processing unit 302 may 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, or a discrete hardware component, and may implement or execute the The disclosed methods, steps and logical block diagrams. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the methods disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in the processor. The software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, register. 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 combination with its hardware.

Referring to FIG. 4 , it is a user plane device 400 provided by an embodiment of the present invention. The device may include: an interface 401 , a processing unit 402 and a memory 403 . The processing unit 402 is used to control the operation of the user plane device 400 ; the memory 403 may include a read-only memory and a random access memory, and is used to provide instructions and data to the processing unit 402 . A portion of memory 403 may also include non-volatile random access memory (NVRAM). Various components of the user plane device 400 are coupled together through a bus system, wherein the bus system 409 includes not only a data bus, but also a power bus, a control bus, and a status signal bus. However, for clarity of illustration, the 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, each step of the user plane processing flow may be completed by an integrated logic circuit of hardware in the processing unit 402 or an instruction in the form of software. The processing unit 402 may 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, or a discrete hardware component, and may implement or execute the The disclosed methods, steps and logical block diagrams. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the methods disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in the processor. The software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, register. 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 combination with its hardware.

Referring to FIG. 5 , it is a media conversion device 500 provided by an embodiment of the present invention. The device may include: an interface 501 , a processing unit 502 and a memory 503 . The processing unit 502 is used to control the operation of the media conversion device 500 ; the memory 503 may include a read-only memory and a random access memory, and is used to provide instructions and data to the processing unit 502 . A portion of memory 503 may also include non-volatile random access memory (NVRAM). Various components of the media conversion device 500 are coupled together through a bus system, wherein the bus system 509 includes not only a data bus, but also a power bus, a control bus, and a status signal bus. However, for clarity of illustration, the various buses are labeled as bus system 509 in the figure.

The processing flow of the control plane and the user plane disclosed in the embodiment of the present invention may be applied to the processing unit 502 or implemented by the processing unit 502 . In the implementation process, each step of the control plane and user plane processing flow can be completed by an integrated logic circuit of hardware in the processing unit 502 or an instruction in the form of software. The processing unit 502 may 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, or a discrete hardware component, and may implement or execute the The disclosed methods, steps and logical block diagrams. A general purpose processor may be a microprocessor or any conventional processor or the like. The steps of the methods disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules in the processor. The software module can be located in a mature storage medium in the field such as random access memory, flash memory, read-only memory, programmable read-only memory or electrically erasable programmable memory, register. 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 its hardware.

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

Referring to FIG. 6 , it is a schematic diagram of a control plane processing flow provided by an embodiment of the present invention. The operations shown in FIG. 6 may be implemented by the control plane device 300 (for example, ATCF), or by a control plane entity in the media conversion device 500 .

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

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

Wherein, the first user equipment and the second user equipment do not specifically refer to one or a certain kind of user equipment, but only refer to peer user equipments that interact with each other for media data.

The second media format is the EVS main mode, and the first media format is different from the second media format. For example, the first media format is AMR mode, and the second media format is EVS main mode, or, the first media format is G.729 mode, and the second media format is EVS main mode. Certainly, the first media format may also be a media format of another type or protocol, which is not limited in this embodiment of the present invention.

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

Step 602: the control sends a notification message to the user plane. The notification message is used to notify the user plane to convert the media packet sent by the first user equipment in the first media format into a media packet in the EVS compatible mode and convert the second user equipment Convert the media packet whose media format is the EVS compatibility mode sent by the device into the media packet whose media format is the first media format. Wherein, the EVS compatibility mode is the AMR-WBIO mode.

For step 602, in a preferred solution, the notification message includes information about the first media format adopted by the first user equipment and information about the second media format adopted by the second user equipment, that is, through the notification message, the The media formats adopted by the first user equipment and the second user equipment are notified to the user plane equipment or the user plane entity, so that the user plane equipment or the user plane entity makes a decision on the media conversion according to the information, that is, it is determined to adopt the EVS compatible mode with all communicate with the second user equipment, and communicate 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, then the control plane will include the above 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 strategy according to the information: convert the media data in the first media format in the media packet of the first user equipment to the media data in the EVS compatible mode media data, and use the RTP (Real-timeTransportProtocol, real-time transport protocol) message format of EVS or the RTP message format of EVS compatible mode to encapsulate the media data of the EVS compatible mode obtained by the conversion; The media data in the EVS compatible mode in the media message is converted into media data in the first media format, and the converted media data in the first media format is encapsulated using the RTP message format of the first media format.

Wherein, the media format refers to the codec mode of the media data, and the media data of different media formats will be obtained by adopting different codec modes. The message format refers to the encapsulation of the message. In the embodiment of the present invention, the message format refers to the encapsulation format of the media data.

For step 602, in another preferred solution, the control plane determines according to the first media format and the second media format that the user plane adopts the EVS compatibility mode to communicate with the second user equipment, and adopts the first media format A media format is communicated 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 is incompatible with the second media format, the control plane determines the media conversion policy according to the respective media formats adopted by the first user equipment and the second user equipment, and sends a notification message Notify the user plane of the media conversion strategy. The media conversion strategy may be: converting the media data in the first media format in the media message of the first user equipment to media data in EVS compatible mode, and using the RTP message format of EVS or EVS compatible mode Encapsulate the converted media data in the EVS compatible mode in the RTP message format; convert the media data in the EVS compatible mode in the media message of the second user equipment into media data in the first media format, and use the The RTP packet format of the first media format encapsulates the converted media data in the first media format.

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

Specifically, in one embodiment, after the control plane sends the notification message to the user plane, the user plane can determine the following media conversion strategy according to the notification message: use the RTP packet format of EVS or the RTP packet format of AMR-WB to encapsulate The media data in the media packet sent by the first user equipment uses the RTP packet format of AMR-WB to encapsulate the media data in the media packet sent by the second user equipment.

In another embodiment, the control plane determines the media conversion strategy according to the respective media formats adopted by the first user equipment and the second user equipment, and notifies the user plane through a notification message. The media conversion strategy may be: use the RTP message format of EVS or the RTP message format of AMR-WB to encapsulate the media data in the media message sent by the first user equipment, and use the RTP message format of AMR-WB to encapsulate the first 2. Media data in the media packet sent by the user equipment.

In the foregoing embodiments of the present invention, the RTP message format of EVS refers to the message encapsulation format that adopts when carrying out RTP message encapsulation to the media data that adopts EVS main mode encoding to obtain, and the RTP message format of EVS compatible mode refers to The packet encapsulation format used when the media data encoded in the EVS compatibility mode is used for RTP packet encapsulation. The adopted packet encapsulation format, the RTP packet format of AMR-WB refers to the packet encapsulation format adopted when performing RTP packet encapsulation on the media data encoded in the AMR-WB mode.

As mentioned above, the control plane processing flow shown in FIG. 6 may be executed by a control plane entity in the control plane device 300 or the media conversion device 500 . In the case where the control plane device 300 is used as the execution subject, and SIP ((SessionInitiationProtocol, 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 send The notification message is sent to the user plane device 400. In the case where the media conversion device 500 is the execution subject, in step 602, the control plane entity of the device may use an internal protocol to send the notification message to the user plane entity of the device.

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

The embodiment of the present invention provides a process for the control plane to obtain the media format adopted by both media communication parties through the media negotiation process in the voice fallback scenario in the circuit domain and in the media establishment scenario. Certainly, the voice fallback scenario in the circuit domain and the media establishment scenario are two typical scenarios, but the embodiment of the present invention is not limited to acquiring the media format adopted by the media communication parties in these two scenarios.

In the CS domain voice fallback scenario, when the user equipment of one party in the media communication switches from E-UTRAN to UTRAN/GERAN, the CS domain voice fallback will be triggered. In this scenario, the network element in the CS domain may send signaling to the media conversion device 500 that includes CS domain voice fallback indication information, and the CS domain voice fallback indication information is used to instruct the first user equipment to access The network switching to the circuit domain access network may further indicate the media format currently used by the user equipment. After receiving the signaling, the control plane entity of the media conversion device 500 can determine the respective media formats adopted by the first user equipment and the second user equipment according to the CS domain voice fallback indication information.

In the media communication establishment scenario, the user equipment requesting media communication first performs media negotiation. During the media negotiation process, the signaling sent by the user equipment requesting media communication is sent to the media conversion device 500 . The control plane entity of the media conversion device 500 receives the signaling that the first user equipment and the second user equipment interact during the media negotiation process, and obtains the SDP (English: SessionDescriptionProtocol, Chinese: Session Description Protocol) carried in the signaling. ) information, and according to the acquired SDP information of the first user equipment and the second user equipment, the respective media formats adopted by the first user equipment and the second user equipment can be determined.

Referring to FIG. 7 , it is a schematic diagram of a user plane processing flow provided by an embodiment of the present invention. The process can include:

Step 701: The user plane receives a notification message sent by the control plane, and the notification message is used to notify the user plane equipment to convert the media message sent by the first user equipment in the first media format into the media format of A media packet in the EVS compatibility mode and converting a media packet in the EVS compatibility mode sent by the second user equipment into a media packet 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 in the first media format into a media format is a media message in EVS compatibility mode, and sends a media message in which the converted media format is EVS compatibility mode to the second user equipment;

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

Wherein, the EVS compatibility mode is the AMR-WBIO mode.

It should be noted that the timing of step 702 and step 703 is not strictly required. During media interaction between the first user equipment and the second user equipment, step 702 and step 703 may be executed multiple times.

If the first media format is incompatible with the second media format, in step 702, the process for the user to convert the media message sent by the first user equipment may include: The media data in the first media format in the media message of the user equipment is converted into media data in the EVS compatibility mode, and the EVS compatibility obtained by using the RTP message format of the EVS or the RTP message format of the EVS compatibility mode is encapsulated. The media data in the EVS compatible mode of the mode; the process of converting the media message sent by the second user equipment may include: converting the media data in the EVS compatible mode in the media message of the second user equipment into the first Media data in a media format, and use the RTP packet format of the first media format to encapsulate the converted media data in the first media format.

Wherein, further, the converted media format is carried in the media packet of the EVS compatible mode, and the media format field is used to notify the second user equipment to use the EVS compatible mode to send messages to the second user equipment. Encoding is performed on the media data sent to the first user equipment. For example, in the RTP media message encapsulated using the RTP format of EVS, the CMR (English: CodecModeRequest, Chinese: Coding Mode Request) field request is the EVS compatibility mode, so that the second user equipment according to the content of the CMR field , use the EVS compatible mode to encode the media data sent to the first user equipment.

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

As described in the foregoing embodiments, if the notification message carries the media conversion strategy determined by the control plane, the user plane performs media conversion according to the media conversion strategy; if the notification message does not carry the media conversion strategy, but carries the first user device and the media format information adopted by the second user equipment, the user plane can determine the media conversion policy according to the information.

It can be seen from the above description that in the embodiment of the present invention, on the control plane, determine the media formats used by the first user equipment and the second user equipment for media data interaction, and send a notification message 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, so as to realize media intercommunication.

Wherein, the notification message sent by the control plane to the user plane may include the media format information respectively adopted by the first user equipment and the second user equipment, so that the user plane can determine the media conversion strategy according to the information; the control plane can also determine the media conversion strategy Then notify the user plane through a notification message to instruct the user plane how to convert the media packet. Regardless of whether the media conversion strategy is determined by the control plane or the user plane, after the media packet of the first user equipment is converted, the second user equipment is notified to use the EVS compatible mode encodes the media data sent to the first user equipment. In this way, although the media format adopted by the second user equipment is determined to be the EVS main mode on the control plane, the media format of the first user equipment is realized on the user plane. Intercommunication between the media data of the second user equipment based on the EVS compatibility mode.

On the one hand, since the EVS main mode and the EVS compatible mode are compatible with each other, the decoder of the second user equipment can correctly decode the media data in the EVS compatible mode, thereby realizing media intercommunication; The device uses the EVS compatibility mode to encode the media data sent to the first user equipment, so as to realize the conversion or intercommunication between the first media format and the EVS compatibility mode, and convert the first media format and the EVS main mode Compared with or intercommunication, it can reduce the resource overhead of encoding and decoding.

In order to understand the content described in the embodiments of the present invention more clearly, the above-mentioned process will be described in detail through three preferred embodiments below with reference to FIG. 8 to FIG. 13 .

Preferred embodiment one

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

As the calling party, UE1 requests to make a voice call with UE2, and the voice call establishment process can be shown in Figure 8, which mainly includes the following steps:

Step 801: UE1 initiates a call request (SIP INVITE message in the figure), carrying that the media capability adopted by UE1 is the audio codec EVS primary mode (EVSPrimary).

Among them, the SDP information carried in the SIP INVITE message may include the following:

m=audioxxxxxxRTP/AVP969798

a=rtpmap:96EVS/16000/1

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

a=rtpmap:97AMR-WB/16000

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

a=rtpmap:98AMR/8000

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

a=sendrecv

a=ptime:20

The above SDP information shows the media name, transmission port and media attribute information of UE1, wherein the media format adopted by UE1 is EVSPrimary. For the meaning of the above SDP information, refer to the SDP protocol.

Step 802: The call request of UE1 is forwarded to the call control network, and the call control network forwards the call request to UE2. The call control network includes a media conversion device 500 .

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

Among them, the SDP information carried in the 183 message may include the following:

m=audioxxxxxxRTP/AVP96

a=rtpmap:96EVS/16000/1

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

a=sendrecv

a=ptime:20

The above SDP information shows the media name, transmission port and media attribute information of UE2, wherein the media format adopted by UE2 is EVSPrimary. For the meaning of the above SDP information, refer to the SDP protocol.

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

Steps 805-810: UE2 responds. After UE1 receives the response message from UE2, the interaction of media information between the calling party and the called party is completed. Afterwards, use the negotiated EVSPrimary media format to realize media interaction, for example, a voice call or a video call can be made.

Afterwards, UE1 switches from E-UTRAN to UTRAN/GERAN, triggering CS domain voice fallback, and the call control network performs the process shown in Figure 9:

Steps 901-902: The control plane entity in the call control network (for example, the control plane entity in the media conversion device 500) receives the signaling sent by the SRVCCIWF, which carries an indication that UE1 switches from the PS domain access network to the CS domain access network Further, the indication information may also indicate that the media format currently adopted by UE1 is AMR. After UE1 accesses the network and switches, the media format used is AMR. The control plane entity judges that UE1 and UE2 cannot directly communicate with each other according to the indication information.

Step 903: the control plane entity decides to convert the media data in AMR format sent by UE1 into media data in AMR-WBIO format, and sends the indication information indicating the decision result to the user plane entity through a notification message.

Step 904: The user plane entity prepares media codec conversion resources 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 shown in Figure 10a and Figure 10b, including:

Receive the AMRRTP message sent by UE1, obtain the AMR coded payload from the message, call the AMR decoder to decode the coded payload, restore the original voice signal, and then use the AMR-WB coder to the original voice signal Encoding is performed to obtain the AMR-WB encoded payload. Encapsulate the AMR-WB encoded payload into the RTP message according to the EVSRTP message format, and send the encapsulated EVSRTP message to the EVS decoder of the UA on the UE2 side. Wherein, the CMR field in the EVSRTP message requests the codec mode of AMR-WB.

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

The user plane entity of the media conversion device 500 receives the RTP media message in the EVS compatibility mode, obtains the AMR-WB coded payload, calls the AMR-WB decoder to decode the coded payload, restores the original voice signal, and then uses the AMR The encoder encodes the original voice signal to obtain the AMR coded payload. Then encapsulate the AMR coded payload into an AMR RTP message, and send the encapsulated AMRRTP message to the SRVCCIWF. The AMRRTP message can be terminated by the SRVCCIWF or forwarded to UE1 via the SRVCCIWF for termination.

In the above process, some fields related to the codec in the header of the AMRRTP message can be shown in Figure 11a, CMR=15, indicating that a certain mode of AMR is requested; the format of the EVSRTP message can be shown in Figure 11b, Among them, the RTP header is not included, and only the EVScodec-specific part is included. The CMR field in the EVSRTP message has 8 bytes, as shown in Figure 11c, H represents the header type identification bit, the T field is used to indicate the bandwidth of EVSAMR-WBIO mode and EVSPrimary mode, and the D field is used to indicate the codec mode request , that is, request the AMR-WB mode through the D field. The ToC field in the EVSRTP message is used to indicate the type of frame encapsulated in the message, for example, a frame in EVSPrimary (EVS main mode) or EVSAMR-WBIO (EVS compatible mode) speech coding mode.

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

Optionally, in the above step 904, the user plane entity may also encapsulate the AMR-WB encoded payload according to the RTP message encapsulation format of AMR-WB, that is, encapsulate the AMR-WB encoded payload according to RFC4867, and obtain the AMR-WBRTP packet text, and send the AMR-WBRTP packet to the second user equipment.

Optionally, in the above step 904, the network element or UE2 using the EVS codec may also encapsulate the AMR-WB coded payload generated by the code according to the AMR-WB RTP packet encapsulation format, That is, the AMR-WB encoded payload is encapsulated according to RFC4867 to obtain an AMR-WBRTP message, and the message is sent to the media conversion device 500 .

Optionally, in the above step 904, if the user plane entity receives the AMR-WBRTP message (that is, the RFC4867 format), it directly obtains the AMR-WB encoded payload and decodes the voice signal.

It can be seen from the above description of the preferred embodiment 1 that the AMR-WB codec can be interoperated with the EVS codec directly on the user plane, on the one hand, the codec conversion strategy on the user plane can be independent of the media negotiation on the control plane As a result, on the other hand, compared with switching between the AMR and EVS main modes, the system resource overhead can be reduced, thereby improving the call processing specification in the eSRVCC handover scenario.

Preferred embodiment two

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

As the calling party, UE1 requests to make a voice call with UE2, and the voice call establishment process can be shown in Figure 12, which mainly includes the following steps:

Step 1201: UE1 initiates a call request (SIP INVITE message in the figure), carrying the media capability adopted by UE1 as audio codec EVS primary mode (EVSPrimary).

Step 1202: 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 G.729, to the call request. The call control network includes a media conversion device 500 .

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

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

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

Step 1211: The control plane entity of the media conversion device 500 judges that UE1 and UE2 cannot communicate directly, then selects the AMR-WB codec for UE2, selects the AMR codec for UE1, and sends the indication information indicating the judgment result (such as the aforementioned second Instruction information) is sent to the user plane entity of the media conversion device 500 through a notification message, and the user plane entity prepares media codec conversion resources to implement 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, for example:

Receive the G.729RTP message sent by UE1, obtain the G.729 encoded payload from the message, call the G.729 decoder to decode these encoded payloads, restore the original voice signal, and then encode it with AMR-WB The device encodes the original voice signal to obtain the AMR-WB coded payload. Encapsulate the AMR-WB encoded payload into the RTP message according to the EVSRTP message format, and send the encapsulated EVSRTP message to the EVS decoder of the UA on the UE2 side. Wherein, the CMR field in the EVSRTP message requests the codec mode of AMR-WB.

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

The user plane entity of the media conversion device 500 receives the RTP media message in the EVS compatibility mode, obtains the AMR-WB coded payload therefrom, calls the AMR-WB decoder to decode the coded payload, restores the original voice signal, and then uses the G The .729 encoder encodes the original voice signal to obtain the AMR encoded payload. Then encapsulate the AMR coded payload into an AMR RTP message, and send the encapsulated AMRRTP message to the SRVCCIWF. The AMRRTP message can be terminated by the SRVCCIWF or forwarded to UE1 via the SRVCCIWF for termination.

Optionally, in the above step 1211, the control plane entity of the media conversion device 500 may also directly notify the user plane entity of indication information indicating that UE2 adopts the EVS main mode media format (such as the aforementioned first indication information), and the user plane entity The surface entity judges and converts the data in the G.729 format sent by the UE1 into the data in the AMR-WB format.

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

Optionally, in the above step 1212, the network element or UE2 using the EVS codec can also encapsulate the AMR-WB coded payload generated by the code according to the RTP packet encapsulation format of the AMR-WB, That is, the AMR-WB encoded payload is encapsulated according to RFC4867 to obtain an AMR-WBRTP message, and the message is sent to the media conversion device 500 .

Optionally, in the above step 1212, if the user plane entity receives the AMR-WBRTP message (that is, the RFC4867 format), it directly obtains the AMR-WB coded payload and decodes the voice signal.

From the above description of preferred embodiment 2, it can be seen that the control plane of the call control network does not need to care about the resource capabilities of the user plane of the call control network, and the user plane decides whether to implement intercommunication with the EVS codec based on AMR-WB, so that 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 and the user plane are separated (i.e. not on a unified device). The control plane does not need to care about the resource situation of the user plane, and can directly conduct business negotiation according to the actual business needs, and the media interworking is completed by the user plane itself. time optimization.

Preferred Embodiment Three

The third preferred embodiment takes a SIP call as an example to describe the process of realizing interworking between AMR-WB codec and EVS main mode codec based on media message format conversion.

As the calling party, UE1 requests a voice call with UE2, and the voice call establishment process can be shown in Figure 13, which mainly includes the following steps:

Step 1301: UE1 initiates a call request (SIP INVITE message in the figure), carrying that the media capability adopted by UE1 is the audio codec EVS primary mode (EVSPrimary).

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 call control network includes a media conversion device 500 .

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

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

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

Step 1311: The control plane entity of the media conversion device 500 determines that UE1 and UE2 can communicate directly, and then decides to perform packet format conversion by the user plane. For example, a notification message may be sent to the user plane entity, which carries second indication information for indicating how to perform media packet format conversion.

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

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

Receive the EVSRTP message sent by UE1, obtain the AMR-WB coded payload from the message, encapsulate the AMR-WB coded payload into the RTP message according to the AMR-WBRTP message format, and wrap the encapsulated AMR-WBRTP message The text is sent to the UE2 side.

After receiving the EVSRTP message, the EVS decoder of the UA on the UE2 side finds that the message payload is AMR-WB, and then decodes the AMR-WB media payload according to the EVS compatibility mode to decode the voice signal. Encoding the voice signal at the local end, 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 compatibility mode and sent to the media conversion device 500.

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

Optionally, in the above step 1311, the control plane entity of the media conversion device 500 may also directly notify the user plane entity of indication information indicating that UE2 adopts the EVS main mode media format, and the user plane entity decides the format conversion of the media message Way.

Optionally, in the above step 1312, the network element or UE1 using the EVS codec can also encapsulate the AMR-WB coded payload generated by the code according to the AMR-WB RTP packet encapsulation format, That is, the AMR-WB encoded payload is encapsulated according to RFC4867 to obtain an AMR-WBRTP message, and the message is sent to the media conversion device 500 .

Optionally, in the above step 1312, after the user plane entity decapsulates and obtains the AMR-WB encoded payload in the media message sent by the second user equipment, it may also encapsulate the AMR according to the RTP message encapsulation format of AMR-WB - WB encoded payload, that is, encapsulating the AMR-WB encoded payload according to RFC4867 to obtain an AMR-WBRTP message, and sending the message to the first user equipment.

Optionally, in the above step 1312, if the user plane entity receives the AMR-WBRTP message (ie RFC4867 format) sent by UE2, it directly obtains the AMR-WB encoded payload and decodes the voice signal.

As can be seen from the description of the above-mentioned preferred embodiment three, when one side of the user plane of the call control network is the AMR-WB codec format and the other side is the EVS codec format, there is no need to convert the media payload type. Just perform RTP packet encapsulation format conversion. This method greatly saves the encoding and decoding payload conversion resources.

Based on the same technical idea, the embodiment of the present invention also provides a media conversion control plane device, a media conversion user plane device, and a media conversion device.

Referring to FIG. 14a or FIG. 14b , it is a schematic structural diagram of a control plane device 600 and a control plane device 610 provided by 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 a first user equipment adopts a first media format, and a second user equipment communicating with the first user equipment adopts a second media format, wherein the first media format is different from the second media format. The media format, the second media format is the EVS main mode; the notification module 62 is configured to send a notification message to the user plane device, and the notification message is used to notify the user plane device to send the media sent by the first user device Converting a media message whose format is the first media format into a media message whose media format is EVS compatible mode and converting a media message whose media format is EVS compatible mode sent by the second user equipment into a media message whose media format is the first media format format of the media packet.

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

In another implementation manner, as shown in FIG. 14b , the control plane device 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 uses an EVS compatible mode to communicate with the second user equipment, and uses the first media format to communicate with the second user equipment. The first user equipment communicates. In this case, the notification message includes the result determined by the control plane device.

For the control plane device 600 or the control plane device 610, when 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 EVS or the RTP of AMR-WB The packet format encapsulates the media data in the media packet sent by the first user equipment, and uses the AMR-WB RTP packet format to encapsulate the media data in the media packet sent by the second user equipment.

Referring to FIG. 15a or FIG. 15b , it is a schematic structural diagram of a user plane device 700 and a user plane device 710 provided by 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, wherein:

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 message sent by the first user equipment in the first media format into a media A media packet whose format is an EVS compatible mode and converting a media packet whose media format is an EVS compatible mode sent by the second user equipment into a media packet whose media format is a first media format;

The first conversion module 72 is configured to receive the media message sent by the first user equipment in the first media format, and convert the media message sent by the first user equipment into the first media format. is a media message whose media format is EVS compatible mode, and sends the converted media message whose media format is EVS compatible mode to the second user equipment;

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

Wherein, the media format converted by the first conversion module 72 is carried in the media message of the EVS compatible mode, and the media format field is used to notify the second user equipment to use the EVS compatible mode for the second The user equipment encodes the media data sent by the first user equipment.

In another implementation manner, when the notification message includes the information of the first media format and the information of the second media format, as shown in FIG. 15b, the user plane device 710 may further include Decision Module 74. A decision-making module 74, 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 use the EVS compatible mode to communicate with the second user equipment, using the first A media format is communicated with the first user device.

In the above-mentioned control plane device 600 or control plane device 610, the first conversion module 72 is further configured to use the real-time transport protocol RTP message format of EVS or the RTP message format of EVS compatible mode to encapsulate the converted EVS compatible mode Media data; the second conversion module 73 is further configured to use the RTP packet format of the first media format to encapsulate the converted media data in the first media format.

In the above-mentioned control plane device 600 or control plane device 610, in the case that the first media format is AMR-WB, the first conversion module 72 may be specifically configured to use the RTP message format of EVS or the RTP message format of AMR-WB The text format encapsulates the media data in the media message sent by the first user equipment; the second conversion module 73 can be specifically configured to use the AMR-WB RTP message format to encapsulate the media data sent by the second user equipment media data.

Referring to FIG. 16 , it is a schematic structural diagram of a media conversion device 800 provided by an embodiment of the present invention. The media conversion device 800 may 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 a first media format, and that a second user equipment communicating with the first user equipment adopts a second media format, where the first media format is different from the first media format. Two media formats, the second media format is the enhanced voice service EVS main mode; and, sending a notification message to the user plane equipment, the notification message is used to notify the user plane equipment to send the media sent by the first user equipment Converting a media message whose format is the first media format into a media message whose media format is EVS compatible mode and converting a media message whose media format is EVS compatible mode sent by the second user equipment into a media message whose media format is the first media format format media message;

The user plane entity 82 is configured to receive the media packet sent by the first user equipment in the first media format, and convert the media packet sent by the first user equipment in the first media format into The media format is a media message in EVS compatible mode, sending the converted media message to the second user equipment in EVS compatible mode; and receiving the media message sent by the second user equipment in EVS compatible mode Convert the media message sent by the second user equipment with the media format of the EVS compatible mode into a media message with the media format of the first media format, and send the converted media message to the first user equipment The format is a media message in the first media format.

Wherein, the media format converted by the user plane entity is an EVS compatible mode media message carrying a media format field, and the media format field is used to notify the second user equipment to use the EVS compatible mode to The user equipment encodes the media data sent by the first user equipment.

In an implementation manner, the notification message includes the information of the first media format and the information of the second media format. In this case, the user plane entity 82 is further 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, that the use of the EVS compatibility mode is compatible with the second media format The second user equipment communicates 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 in an EVS compatible mode, using The first media format is communicated with the first user device. In this case, the notification message includes the result determined by the control plane device.

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

Further, when the first media format is AMR-WB, the user plane entity 82 may be specifically configured to use the RTP packet format of EVS or the RTP packet format of AMR-WB to encapsulate the first user equipment to send the media data in the media packet sent by the second user equipment; and encapsulating the media data in the media packet sent by the second user equipment using the RTP packet format of AMR-WB.

To sum up, in the embodiment of the present invention, when performing format conversion between EVS codec and other media codecs, if the control plane has negotiated the EVS main mode, on the user plane, through the information exchange of the RTP message, request the EVS The codec is switched to the EVS compatibility mode, that is, when the AMR-W coded media message can be received and correctly decoded, the EVS codec can also be encoded according to the AMR-WB codec format, so that the EVS codec The media packet sent by the device can be correctly decoded by the AMR-WB decoder. Through the above implementation, the media conversion resources of the media codec conversion gateway can be saved under the condition of satisfying the basic intercommunication.

The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It should be understood that each procedure and/or block in the flowchart and/or block diagram, and a combination of procedures and/or blocks in the flowchart and/or block diagram can be realized by computer program instructions. These computer program instructions may be provided to a general purpose computer, special purpose computer, embedded processor, or processor of other programmable data processing equipment to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing equipment produce a An apparatus for realizing the functions specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing apparatus to operate in a specific manner, such that the instructions stored in the computer-readable memory produce an article of manufacture comprising instruction means, the instructions The device realizes the function specified in one or more procedures of the flowchart and/or one or more blocks of the block diagram.

These computer program instructions can also be loaded onto a computer or other programmable data processing device, causing a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process, thereby The instructions provide steps for implementing the functions specified in the flow chart or blocks of the flowchart and/or the block or blocks of the block diagrams.

While preferred embodiments of the invention have been described, additional changes and modifications to these embodiments can be made by those skilled in the art once the basic inventive concept is appreciated. Therefore, it is intended that the appended claims be construed to cover the preferred embodiment as well as all changes and modifications which fall within the scope of the invention.

Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalent technologies, the present invention also intends to include these modifications and variations.

Claims (31)

1. a media interoperability methods, is characterized in that, described method comprises:

Chain of command equipment determination first user equipment adopts the first media formats, adopts the second media formats with the second subscriber equipment of described first user devices communicating, wherein, described first media formats is different from described second media formats, and described second media formats is for strengthening voice service EVS holotype;

Described chain of command equipment is to user face equipment dispatch order message, and described notification message is for notifying described user face equipment and the media message that the media formats that described first user equipment sends is the first media formats is converted to the media message that media formats is EVS compatibility mode and the media message being EVS compatibility mode by the media formats that described second subscriber equipment sends being converted to the media message that media formats is the first media formats.

2. the method for claim 1, is characterized in that, described notification message comprises the information of described first media formats and the information of described second media formats.

3. the method for claim 1, is characterized in that, described method also comprises:

According to described first media formats and described second media formats, described chain of command equipment determines that described user face equipment adopts EVS compatibility mode to communicate with described second subscriber equipment, adopt described first media formats to communicate with described first user equipment;

Wherein, described notification message comprises the result that described chain of command equipment is determined.

4. method as claimed any one in claims 1 to 3, it is characterized in that, described method also comprises:

The media data of the EVS compatibility mode be converted to described in the realtime transmission protocol RTP message format of described user face equipment use EVS or the RTP message format of EVS compatibility mode encapsulate;

The media data of the first media formats be converted to described in the RTP message format encapsulation of described user face equipment use first media formats.

5. method as claimed any one in claims 1 to 3, it is characterized in that, described first media formats is wideband adaptive multi tate AMR-WB;

The described media message being the first media formats by the media formats that described first user equipment sends is converted to the media message that media formats is EVS compatibility mode, comprising:

The described RTP message format of user face equipment use EVS or the RTP message format of AMR-WB encapsulate the media data in the media message of described first user equipment transmission;

The described media message being EVS compatibility mode by the media formats that described second subscriber equipment sends is converted to the media message that media formats is the first media formats, comprising:

Media data in the media message of the described second subscriber equipment transmission of RTP message format encapsulation of described user face equipment use AMR-WB.

6. a media interoperability methods, is characterized in that, comprising:

User face equipment receives the notification message that chain of command equipment sends, and described notification message is for notifying described user face equipment the media message that the media formats that described first user equipment sends is the first media formats is converted to the media message that media formats is EVS compatibility mode and the media message being EVS compatibility mode by the media formats of described second subscriber equipment transmission being converted to the media message that media formats is the first media formats;

It is the media message of the first media formats that described user face equipment receives the media formats that described first user equipment sends, the media message being the first media formats by the media formats that described first user equipment sends is converted to the media message that media formats is EVS compatibility mode, sends to described second subscriber equipment the media message that the media formats after changing is EVS compatibility mode;

The media formats that equipment reception described second subscriber equipment in described user face sends is the media message of EVS compatibility mode, the media message being EVS compatibility mode by the media formats that described second subscriber equipment sends is converted to the media message that media formats is the first media formats, sends to described first user equipment the media message that the media formats after changing is the first media formats.

7. method as claimed in claim 6, it is characterized in that, described change after the media message of media formats into EVS compatibility mode in carry media formats field, described media formats field is for notifying that described second subscriber equipment uses EVS compatibility mode to encode to the media data that described second subscriber equipment sends to described first user equipment.

8. method as claimed in claims 6 or 7, it is characterized in that, described notification message comprises the information of described first media formats and the information of described second media formats;

Described method also comprises:

The information of described first media formats that described user face equipment comprises according to described notification message and the information of described second media formats, determine to adopt EVS compatibility mode to communicate with described second subscriber equipment, adopt the first media formats to communicate with described first user equipment.

9. the method according to any one of claim 6 to 8, is characterized in that, described method also comprises:

The media data of the EVS compatibility mode be converted to described in the realtime transmission protocol RTP message format of described user face equipment use EVS or the RTP message format of EVS compatibility mode encapsulate;

The media data of the first media formats be converted to described in the RTP message format encapsulation of described user face equipment use first media formats.

10. method as claimed in claim 6, it is characterized in that, described first media formats is wideband adaptive multi tate AMR-WB;

The media message that the media formats that described first user equipment sends is the first media formats is converted to the media message that media formats is EVS compatibility mode by described user face equipment, comprising:

The described RTP message format of user face equipment use EVS or the RTP message format of AMR-WB encapsulate the media data in the media message of described first user equipment transmission;

The media message that the media formats that described second subscriber equipment sends is EVS compatibility mode by described user face equipment is converted to the media message that media formats is the first media formats, comprising:

Media data in the media message of the described second subscriber equipment transmission of RTP message format encapsulation of described user face equipment use AMR-WB.

11. 1 kinds of media interoperability methods, is characterized in that, comprising:

Chain of command entity determination first user equipment in media changer devices adopts the first media formats, adopts the second media formats with the second subscriber equipment of described first user devices communicating, wherein, described first media formats is different from described second media formats, and described second media formats is for strengthening voice service EVS holotype;

Described chain of command entity sends a notification message to the user entity in described media changer devices, and described notification message is for notifying described user entity and the media message that the media formats that described first user equipment sends is the first media formats is converted to the media message that media formats is EVS compatibility mode and the media message being EVS compatibility mode by the media formats that described second subscriber equipment sends being converted to the media message that media formats is the first media formats;

It is the media message of the first media formats that described user entity receives the media formats that described first user equipment sends, the media message being the first media formats by the media formats that described first user equipment sends is converted to the media message that media formats is EVS compatibility mode, sends to described second subscriber equipment the media message that the media formats after changing is EVS compatibility mode;

The media formats that described second subscriber equipment of described user entity reception sends is the media message of EVS compatibility mode, the media message being EVS compatibility mode by the media formats that described second subscriber equipment sends is converted to the media message that media formats is the first media formats, sends to described first user equipment the media message that the media formats after changing is the first media formats.

12. methods as claimed in claim 11, it is characterized in that, described change after the media message of media formats into EVS compatibility mode in carry media formats field, described media formats field is for notifying that described second subscriber equipment uses EVS compatibility mode to encode to the media data that described second subscriber equipment sends to described first user equipment.

13. methods as described in claim 11 or 12, it is characterized in that, described notification message comprises the information of described first media formats and the information of described second media formats;

Described method also comprises:

The information of described first media formats that described user entity comprises according to described notification message and the information of described second media formats, determine to adopt EVS compatibility mode to communicate with described second subscriber equipment, adopt the first media formats to communicate with described first user equipment.

14. methods as described in claim 11 or 12, it is characterized in that, described method also comprises:

According to described first media formats and described second media formats, described chain of command entity determines that described user entity adopts EVS compatibility mode to communicate with described second subscriber equipment, adopt described first media formats to communicate with described first user equipment;

Wherein, described notification message comprises the result that described chain of command entity is determined.

15. methods according to any one of claim 11 to 14, it is characterized in that, described method also comprises:

Described user entity uses the media data of the EVS compatibility mode be converted to described in the encapsulation of the RTP message format of the realtime transmission protocol RTP message format of EVS or EVS compatibility mode;

Described user entity uses the media data of the first media formats be converted to described in the encapsulation of the RTP message format of the first media formats.

16. methods as claimed in claim 11, is characterized in that, described first media formats is wideband adaptive multi tate AMR-WB;

The described media message being the first media formats by the media formats that described first user equipment sends is converted to the media message that media formats is EVS compatibility mode, comprising:

The described user entity use RTP message format of EVS or the RTP message format of AMR-WB encapsulate the media data in the media message of described first user equipment transmission;

The described media message being EVS compatibility mode by the media formats that described second subscriber equipment sends is converted to the media message that media formats is the first media formats, comprising:

Media data in the media message that described user entity uses described second subscriber equipment of the RTP message format of AMR-WB encapsulation to send.

17. 1 kinds of chain of command equipment, is characterized in that, comprising:

Determination module, for determining that first user equipment adopts the first media formats, adopts the second media formats with the second subscriber equipment of described first user devices communicating, wherein, described first media formats is different from described second media formats, and described second media formats is for strengthening voice service EVS holotype;

Notification module, for to user face equipment dispatch order message, described notification message is for notifying described user face equipment the media message that the media formats that described first user equipment sends is the first media formats is converted to the media message that media formats is EVS compatibility mode and the media message being EVS compatibility mode by the media formats that described second subscriber equipment sends being converted to the media message that media formats is the first media formats.

18. chain of command equipment as claimed in claim 17, is characterized in that, described notification message comprises the information of described first media formats and the information of described second media formats.

19. chain of command equipment as claimed in claim 17, is characterized in that, also comprise:

Decision-making module, for determining that according to described first media formats and described second media formats described user face equipment adopts EVS compatibility mode to communicate with described second subscriber equipment, described first media formats is adopted to communicate with described first user equipment;

Wherein, described notification message comprises the result that described chain of command equipment is determined.

20. chain of command equipment according to any one of claim 18 to 19, it is characterized in that, described first media formats is wideband adaptive multi tate AMR-WB;

Described notification message is for notifying that the described RTP message format of user face equipment use EVS or the RTP message format of AMR-WB encapsulate the media data in the media message of described first user equipment transmission, and the media data in the media message using described second subscriber equipment of the RTP message format of AMR-WB encapsulation to send.

21. 1 kinds of user face equipment, is characterized in that, comprising:

Receiver module, for receiving the notification message that chain of command equipment sends, described notification message is for notifying described user face equipment and the media message that the media formats that described first user equipment sends is the first media formats is converted to the media message that media formats is EVS compatibility mode and the media message being EVS compatibility mode by the media formats of described second subscriber equipment transmission being converted to the media message that media formats is the first media formats;

First modular converter, the media formats sent for receiving described first user equipment is the media message of the first media formats, the media message being the first media formats by the media formats that described first user equipment sends is converted to the media message that media formats is EVS compatibility mode, sends to described second subscriber equipment the media message that the media formats after changing is EVS compatibility mode;

Second modular converter, the media formats sent for receiving described second subscriber equipment is the media message of EVS compatibility mode, the media message being EVS compatibility mode by the media formats that described second subscriber equipment sends is converted to the media message that media formats is the first media formats, sends to described first user equipment the media message that the media formats after changing is the first media formats.

22. user face as claimed in claim 21 equipment, it is characterized in that, described first modular converter change after the media message of media formats into EVS compatibility mode in carry media formats field, described media formats field is for notifying that described second subscriber equipment uses EVS compatibility mode to encode to the media data that described second subscriber equipment sends to described first user equipment.

23. user face equipment as described in claim 21 or 22, it is characterized in that, described notification message comprises the information of described first media formats and the information of described second media formats;

Described user face equipment also comprises:

Decision-making module, for the information of described first media formats that comprises according to described notification message and the information of described second media formats, determine to adopt EVS compatibility mode to communicate with described second subscriber equipment, adopt the first media formats to communicate with described first user equipment.

24. user face equipment according to any one of claim 21 to 23, is characterized in that,

Described first modular converter, also for using the media data of the EVS compatibility mode be converted to described in the encapsulation of the RTP message format of the realtime transmission protocol RTP message format of EVS or EVS compatibility mode;

Described second modular converter, also for using the media data of the first media formats be converted to described in the encapsulation of the RTP message format of the first media formats.

25. user face as claimed in claim 21 equipment, is characterized in that, described first media formats is wideband adaptive multi tate AMR-WB;

Described first modular converter, encapsulates the media data in the media message of described first user equipment transmission specifically for the use RTP message format of EVS or the RTP message format of AMR-WB;

Described second modular converter, the media data in the media message sent specifically for using described second subscriber equipment of the RTP message format of AMR-WB encapsulation.

26. 1 kinds of media changer devices, is characterized in that, comprising:

Chain of command entity, for determining that first user equipment adopts the first media formats, adopts the second media formats with the second subscriber equipment of described first user devices communicating, wherein, described first media formats is different from described second media formats, and described second media formats is for strengthening voice service EVS holotype; And, to user face equipment dispatch order message, described notification message is for notifying described user face equipment and the media message that the media formats that described first user equipment sends is the first media formats is converted to the media message that media formats is EVS compatibility mode and the media message being EVS compatibility mode by the media formats that described second subscriber equipment sends being converted to the media message that media formats is the first media formats;

User entity, the media formats sent for receiving described first user equipment is the media message of the first media formats, the media message being the first media formats by the media formats that described first user equipment sends is converted to the media message that media formats is EVS compatibility mode, sends to described second subscriber equipment the media message that the media formats after changing is EVS compatibility mode; And, the media formats receiving described second subscriber equipment transmission is the media message of EVS compatibility mode, the media message being EVS compatibility mode by the media formats that described second subscriber equipment sends is converted to the media message that media formats is the first media formats, sends to described first user equipment the media message that the media formats after changing is the first media formats.

27. media changer devices as claimed in claim 26, it is characterized in that, described user entity change after the media message of media formats into EVS compatibility mode in carry media formats field, described media formats field is for notifying that described second subscriber equipment uses EVS compatibility mode to encode to the media data that described second subscriber equipment sends to described first user equipment.

28. media changer devices as described in claim 26 or 27, it is characterized in that, described notification message comprises the information of described first media formats and the information of described second media formats;

Described user entity, also for the information of described first media formats that comprises according to described notification message and the information of described second media formats, determine that described employing EVS compatibility mode communicates with described second subscriber equipment, adopt described first media formats to communicate with described first user equipment.

29. media changer devices as described in claim 26 or 27, it is characterized in that, described chain of command entity, also for determining that according to described first media formats and described second media formats described user face equipment adopts EVS compatibility mode to communicate with described second subscriber equipment, described first media formats is adopted to communicate with described first user equipment;

Wherein, described notification message comprises the result that described chain of command equipment is determined.

30. media changer devices according to any one of claim 26 to 27, it is characterized in that, described user entity, also for using the media data of the EVS compatibility mode be converted to described in the encapsulation of the RTP message format of the realtime transmission protocol RTP message format of EVS or EVS compatibility mode; And, use the media data of the first media formats be converted to described in the encapsulation of the RTP message format of the first media formats.

31. media changer devices as claimed in claim 26, is characterized in that, described first media formats is wideband adaptive multi tate AMR-WB;

Described user entity, encapsulates the media data in the media message of described first user equipment transmission specifically for the use RTP message format of EVS or the RTP message format of AMR-WB; And, the media data in the media message using described second subscriber equipment of the RTP message format of AMR-WB encapsulation to send.