WO2008003233A1 - Method and device for achieving inter-connection of multimedia calling between cs domain and ims domain - Google Patents

Method and device for achieving inter-connection of multimedia calling between cs domain and ims domain Download PDF

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Publication number
WO2008003233A1
WO2008003233A1 PCT/CN2007/001993 CN2007001993W WO2008003233A1 WO 2008003233 A1 WO2008003233 A1 WO 2008003233A1 CN 2007001993 W CN2007001993 W CN 2007001993W WO 2008003233 A1 WO2008003233 A1 WO 2008003233A1
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WIPO (PCT)
Prior art keywords
domain
ims
media stream
call
media
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PCT/CN2007/001993
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French (fr)
Chinese (zh)
Inventor
Geng Wang
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Huawei Technologies Co., Ltd.
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Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008003233A1 publication Critical patent/WO2008003233A1/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00Data switching networks
    • H04L12/64Hybrid switching systems

Definitions

  • the present invention relates to the field of communications, and in particular, to a method and apparatus for implementing multimedia call interworking between a CS domain and an IMS domain. Background technique
  • CS DOMAIN Multimedia call service is an important service in the third generation mobile communication system, and it is one of the landmark services of the third generation mobile communication. This kind of business enables users to see the image of the other party while making a voice call, which is a business with important practical application value.
  • the WCDMA third-generation mobile communication began with the R4 version and defined a system architecture to complete various services, including video telephony services.
  • the basic network elements included in this system architecture are: user equipment UE, WCDMA system base station NODE B, WCDMA system base station controller RNC, MGW and MSG SERVER.
  • a basic networking relationship of the system architecture is shown in Figure 1.
  • UE The terminal device used by the user, often referred to as a mobile phone.
  • NODE B Mainly responsible for wireless signal transmission and reception.
  • RNC Mainly responsible for the management of the wireless access network.
  • MGW Mainly responsible for the management of various bearer resources and the actual operation of the connection network.
  • MSG SERVER It is the core of the system. It is mainly responsible for the logical control of various services, uniformly scheduling various network resources, and generating call records.
  • a interface air interface signaling channel.
  • c interface Media gateway control signaling channel.
  • d interface BICC/ISUP/SIP signaling channel.
  • the WCDMA third-generation mobile communication system provides a service called Multimedia call, which can complete the voice call function and the data communication function. Into the video phone function.
  • H.245 Multimedia Communication Control Protocol The H.245 protocol defined by ITU-T defines how to establish a multi-body flow channel through a series of negotiation within a single service data channel.
  • the terminal capability negotiation process is defined ( After the process is performed, both parties can know the media types supported by the other party, such as voice, video, etc., master-slave discrimination (determination of master-slave relationship), and multiplexing control information interaction (in order to support multiple transmissions in one service channel simultaneously) Media stream), open and close media stream channels, and more.
  • the H.245 signaling message mainly includes two categories:
  • the first is a signaling message prepared for establishing a media stream channel, including a terminal capability transmission message (TSS) and a response message, a master-slave discrimination message (MSD) and a response message, a multiplex table transmission message (MUXTBS D), and a response.
  • TSS terminal capability transmission message
  • MSD master-slave discrimination message
  • MUXTBS D multiplex table transmission message
  • the second is to open and close the signaling message of the media stream channel, including opening the media stream channel message.
  • OLC media stream channel message
  • CLC media stream channel message
  • the OLC message can establish a forward or a pair of bidirectional media stream channels at a time. If the other party opens the media stream channel command response (OLC ACK) message, the two parties successfully establish a media stream channel, and if the received media stream is opened, The channel command reject response message (OLC REJECT) or timeout did not receive a response, indicating that the media stream channel failed to be established. Closing the media stream channel also requires receiving a successful response message, indicating that the shutdown was successful.
  • H.223 low bit rate multimedia communication multiplexing protocol The H.223 protocol developed by ITU-T enables communication parties to simultaneously transmit multiple voice, video and data media streams using a single service data channel. It needs to be combined with H.245. Collaborative operation.
  • FIG. 2 it is a structural hierarchy diagram of H.223.
  • the application layer that is, the service object of H.223) is a module that provides and receives various voice, video or data (for example: a microphone of a mobile terminal, The display or camera), the lowest layer, the physical layer is a service data channel.
  • H.223 supports the use of a single physical channel to deliver multiplexed media streams.
  • Solution 1 The establishment of multimedia call in the circuit domain of WCDMA third-generation mobile communication system
  • the first phase is to complete the connection of the call in the manner of data service and establish the bearer service channel between the users.
  • the second phase after the response, the user establishes the inband mode in the bearer service channel through the terminal.
  • the signaling interaction of the media stream determines the voice, video, and/or data media streams to be established, which establishes the multimedia call.
  • the operation of establishing the media stream in the second phase is completely carried out in the band, and the related signaling does not pass through the MSC SERVER. Therefore, the MSC SERVER does not know the establishment of the media stream channel completely, and does not know which of the voice, video or data the user specifically performs.
  • Media type communication Media type communication.
  • Solution 2 The implementation method of another multimedia call in the circuit domain of the WCDMA third generation mobile communication system can also change the process of media stream negotiation from in-band to out-of-band.
  • Another method is to add a cell for media stream negotiation in the air interface signaling and the relay signaling, initiating the call: The message carries information such as the type, number of pieces, codec, and multiplexing control parameters of the media stream to be established by the calling party. Let the network or the called party return the received media stream information and the selected codec and the like in the ringing message or the call progress message, and establish a media stream when the call is answered, and realize the function of the multimedia call.
  • IMS is a new IP-based architecture proposed by WCDMAR5. It is based on SIP and provides a new session management mechanism.
  • the IMS system provides multiple opportunities for media negotiation in a session, one can be determined during the session establishment process, but the user may wish to modify the established media during the call (for example, only the voice stream is established during the session establishment process, Later I wanted to make a video call and I needed to increase the video media stream).
  • the IMS supports a media renegotiation process that enables IMS domain users to add, modify, or delete media streams for established sessions.
  • Summary of the invention The embodiment of the invention provides a method and a device for implementing a multimedia call intercommunication between a CS domain and an IMS domain, so as to implement intercommunication of multimedia calls between the CS domain and the IMS domain.
  • the method of the embodiment of the present invention includes the following steps: the bearer mode of the CS domain is reserved, and the bearer of the IMS domain is converted into the bearer mode of the CS domain to implement interworking of the bearer mode; The transmission mode completes the interworking between the CS domain and the IMS domain media stream.
  • An IMS terminal includes: a reservation unit, configured to retain a bearer mode of a CS domain in a process of interworking between a CS domain and an IMS domain media stream; and a converting unit, configured to convert the bearer of the IMS domain into a CS The bearer mode of the domain to implement interworking of bearer modes.
  • An IP multimedia media gateway functional entity includes: a retaining unit, configured to retain a CS domain bearer mode in a process of interworking between a CS domain and an IMS domain media stream; and a converting unit, configured to: The bearer is converted to the bearer mode of the CS domain to implement interworking in the bearer mode.
  • the bearer mode of the CS domain is reserved, and the bearer of the IMS domain is converted into the bearer mode of the CS domain, so that the bearer mode is unified, so that users in the CS domain and the IMS domain framework can perform Multimedia call.
  • 1 is a schematic structural diagram of an existing WCDMA communication system
  • Figure 2 is a schematic diagram showing the structure of the existing H.223
  • FIG. 3 is a flow chart of steps of a method according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a bearer mode of converting an CS domain and an IMS domain by an IMS terminal according to an embodiment of the present invention
  • FIG. 7 is a signaling flowchart of a normal situation in which a CS domain initiates renegotiation to an IMS domain in Case 2 according to an embodiment of the present invention
  • FIG. 8 is a schematic diagram of the case where the CS domain initiates a renegotiation abnormality to the IMS domain in the second case according to the embodiment of the present invention. Signaling flow chart;
  • FIG. 9 is a signaling flowchart of a normal situation in which the IMS domain initiates renegotiation to the CS domain in the second case in the second embodiment of the present invention.
  • FIG. 11 is a signaling flowchart of the IMS domain initiating a renegotiation abnormality 2 to the CS domain in the second case according to the embodiment of the present invention
  • the embodiment of the present invention provides a method for implementing multimedia call interworking between the CS domain and the IMS domain. See Figure 3, which includes the following main steps:
  • the bearer mode of the CS domain remains unchanged, and the H.223 multiplexing mode is still adopted.
  • the method includes: the IMS terminal decomposes the H.223 multiplexed stream sent from the CS domain into independent media streams; and the IMS terminal merges the independent media streams sent to the CS domain into the H.223 multiplexed stream.
  • the IMS network side a service channel is established for each multimedia call, and the media stream is transparently transmitted in the H.223 multiplexing mode to simulate the bearer mode of the CS domain. Therefore, the interworking of the bearer mode is implemented.
  • Bearer conversion mode 2 Referring to FIG. 5, the media gateway control function entity MGCF or the IP multimedia media gateway function entity IM-MGW converts the CS domain and the IMS domain;
  • the original IMS domain bearer mode is maintained (that is, each media stream is separately transmitted), and the CS domain and the IMS domain bearer mode are mutually converted in the MGCF or the IM-MGW.
  • the bearer mode of the MGCF or the IM-MGW to convert the CS domain and the IMS domain includes: The MGCF or the IM-MGW decomposes the H.223 multiplexed stream flowing from the CS domain to the IMS domain into independent media streams, and flows independent media.
  • the IMS terminal transmits; and the MGCF or IM-MGW merges the independent media streams flowing from the IMS domain to the CS domain into H.223 multiplexed streams, and transmits the H.223 multiplexed streams to the CS terminal.
  • the CS domain uses BICC/ISUP for call control
  • the IMS domain uses SIP for session control.
  • the signaling types used by the two domains are different, the call flows have in common: There are call (session) initiation, ringing, answering, and disconnection operations.
  • the call connection process can be directly interworked. The procedure can be found in the 3GPP TS 24.228 chapter on CS and IMS interworking.
  • the main difference between the CS domain and the IMS domain multimedia call (session) is the way in which the media stream channel is established.
  • the media stream interworking has different processing depending on the CS domain media stream control signaling transmission mode.
  • Transmission mode of CS domain media stream control signaling 1 The media stream control signaling in the CS domain is transmitted in an in-band manner through the service data channel.
  • Transmission mode of CS domain media stream control signaling The media stream control signaling in the CS domain is transmitted in an out-of-band manner through a call signaling channel.
  • step S2 Combining the two bearer conversion modes in the foregoing step S2, the transmission manners of the two CS domain media flow control signaling in step S3, and the initiating multimedia calling party (CS domain user initiated, or IMS domain user initiated), including But not limited to the following seven situations.
  • the bearer mode of the CS domain and the IMS domain is converted by the IMS terminal;
  • the media stream control signaling is transmitted in an in-band manner through the industry data channel;
  • the multimedia call is initiated from the CS domain to the IMS domain, or the multimedia call is initiated from the IMS domain to the CS domain, and the interworking process includes the following steps:
  • the CS domain and the IMS domain communication parties perform media stream operations such as media stream establishment and closing in the established service channel according to the method specified in H.245, and perform multimedia communication.
  • Case 2 The bearer mode of the CS domain and the IMS domain is converted by the MGCF; the media stream control signaling in the CS domain is transmitted in an in-band manner through the service data channel; and the multimedia call is initiated from the CS domain to the IMS domain, see as shown in Figure 6, the interworking process includes the following steps:
  • Step 1 The CS domain user initiates a multimedia call to the IMS domain user, completing the basic call connection such as initiation, ringing, and answering of the call.
  • the MGCF may choose not to establish a media stream when initiating a call to the IMS domain (because the CS domain requires the media negotiation after the response:), or establish a connection from the MGCF to the IMS user.
  • Media stream because users usually establish media streams such as voice and/or video, just after the CS domain establishes these media streams).
  • Step 2 After the call (session) is answered, if the media stream is established on the IMS side, the corresponding media stream on the CS side is established at this time, and the media stream on the CS side is connected to the IMS side to provide the user complete.
  • the media stream channel if the establishment fails, the corresponding media stream of the IMS is removed through the renegotiation process.
  • Step 3 During the call, the CS domain may initiate an operation to open (or close) the media channel to the MS domain, and the MGCF establishes (or closes) the corresponding media stream in the IMS domain through renegotiation.
  • the MGCF replies to the CS domain to open (or close) the media stream channel success response message.
  • the CS domain initiates opening (or closing) the media stream channel to the IMS domain
  • the MGCF replies to the CS domain (or Close)
  • the media stream channel refuses to respond.
  • Step 4 During the call, the IMS domain may establish (close) the media stream to the CS domain through renegotiation, and the MGCF controls the CS domain to open (or close) the media stream.
  • the normal situation of the renegotiation includes the following steps:
  • the IMS domain initiates opening (or closing) the media stream channel to the CS domain.
  • the MGCF proxy IMS domain completes the media stream of the CS domain to be opened (or closed). If the SDP in the INVITE message indicates that multiple media streams need to be processed, this step needs to be repeated until all media streams are processed. carry out.
  • the MGCF proxy CS domain completes the subsequent media negotiation process of the IMS domain.
  • the MGCF performs media weight according to the existing regulations.
  • the IMS domain in the second abnormal situation of the renegotiation, after the IMS domain initiates the establishment of the media stream channel to the CS domain and receives the success response message, if the IMS times out or any other failure, the MGCF to the CS The domain initiates the closing of the media stream channel processing that is turned on (or turned off).
  • Step 5 Disassemble the line at the end of the call.
  • the third step and the fourth step have no fixed sequence relationship, and the third step and the fourth step can be initiated multiple times before the line is disconnected.
  • the interworking process includes the following steps: The first step, the call (session) establishment phase, completes the basic call connection of the originating, ringing, and answering of the call.
  • the establishment of the media stream channel of the CS domain must be started after the response, and the normal processing of the IMS domain starts the negotiation of the media stream when the session is initiated, and requires The media negotiation is confirmed and the media negotiation is completed before the called party answers. Because the timing of the negotiation between the two domains is inconsistent, when the IMS initiates the media negotiation, the MGCF can only presuppose a result of media negotiation with the CS domain, and reply the IMS user before the response to comply with the IMS. The session process, while the real negotiation takes place between the IMS and the CS after the response.
  • the MGCF can assume the result of media negotiation with the CS domain as follows:
  • the MGCF accepts the media stream from the IMS to the CS initiated by the IMS user, and rejects the media stream from the CS to the IMS initiated by the IMS user. (Because the CS domain user may be willing to accept the media stream from the IMS, but the process has not yet reached the stage of expressing the willingness of the CS domain. If the MGCF rejects the media stream from the IMS to the CS at this time, then when the media stream is actually negotiated later, The IMS user has to repeatedly express the desire to establish a media stream from IMS to CS in one session, and the user experience is not good.
  • the MGCF rejects all media streams that the IMS user wants.
  • the MGCF accepts all media streams desired by the IMS subscriber.
  • the MGCF establishes a media stream to the CS domain according to the pre-assumed negotiation result of the first step. If there is a media stream that needs to be established, and if the establishment fails, the MGCF initiates renegotiation in the IMS domain to tear down the corresponding established Media stream.
  • the CS domain may initiate an operation of opening (or closing) the media circulation channel to the IMS domain, and the MGCF establishes (or closes) the corresponding media stream in the IMS domain through renegotiation.
  • Step 4 During the call, the IMS domain may establish (close) the media to the CS domain through renegotiation. Stream, MGCF manipulates the CS domain to open (or close) the media stream.
  • the fifth step is to disconnect the line at the end of the call.
  • the third step and the fourth step have no fixed sequence relationship, and the third step and the fourth step can be initiated multiple times before the line is disconnected.
  • the CS domain user initiates a multimedia call to the IMS domain user, and completes the basic call connection such as initiation, ringing, and answering of the call.
  • the IMS domain may choose not to establish a media stream when the call is initiated (because the CS domain does not carry the media stream information in the IAM message that initiated the call), or choose to establish a default media stream (because usually the user is in the process of subsequent calls) Voice and (or video, etc.) media streams are created.
  • the CS domain user may have initiated the operation of establishing the media stream channel, but since the IMS needs to be able to start the media renegotiation process after the response, the MGCF may choose to temporarily reject these users from the CS domain. These requests are temporarily processed in a manner that assumes that the IMS domain user accepts these requests, first establishing a media stream channel from the CS domain to the MGCF.
  • the second step after the called user answers, the MGCF integrates the media stream channel established by the CS side or the IMS side. If some media channels are not completed, that is, only the media stream channel of the CS side or the IMS side exists, The MGCF establishes a media channel to the other side, and connects the media streams on both sides to provide a complete media stream channel for the user. If the establishment fails, the corresponding media stream on the other side that has been established is removed through the renegotiation process.
  • Step 3 The subsequent media stream re-negotiation process during the call and the disconnection process at the end of the call are basically the same as steps 3 to 5 in the above case 2, except that the H.245 message is out of band. Channel transfer.
  • Step 1 The call (session) setup phase completes the basic call connection operation such as call initiation, ringing, and answer.
  • the IMS domain initiates the media stream negotiation by carrying the media stream parameter information when the session is initiated, and requires the media negotiation to obtain the response before the called party answers. Confirm and complete media negotiation.
  • the MGCF needs to initiate a media channel establishment process to the CS domain in response to the call response, and respond to the IMS side according to the result of the success or failure of the establishment.
  • Step 1 The CS domain user initiates a multimedia call to the IMS domain user, completing the basic call connection such as initiation, ringing, and answering of the call.
  • the CS domain initiates a call to the IMS domain, it will carry the media information to start the media negotiation. This is consistent with the media negotiation process of the IMS domain. Therefore, only the MGCF needs to initiate a session request to the IMS domain user in the session request message.
  • the media stream information that the CS domain wants to establish when receiving the final confirmation message of the IMS domain user, feeds back the negotiation result to the CS domain through the ringing or call progress message of the CS domain, and establishes the media stream to be established.
  • the second step During the call, the CS domain user or the IMS domain user may initiate media renegotiation. Because the process is consistent, the process only needs the MGCF to perform signaling and bearer conversion on the CS domain and the IMS domain.
  • Step 7 The bearer mode of the CS domain and the IMS domain is converted by the IMS terminal; the media stream control signaling in the CS domain is transmitted in an outband manner through the call signaling channel; the media stream control signaling information is passed The call control signaling is carried in the manner of binding; the multimedia call is initiated from the IMS domain to the CS domain, and the interworking process includes the following steps: Step 1: The IMS domain user initiates a multimedia call to the CS domain user, completing the basic call connection such as initiation, ringing, and answering of the call. When the IMS domain initiates a call to the CS domain, it carries the media information to start the media negotiation. This is consistent with the media negotiation process of the IMS domain.
  • the MGCF needs to initiate a session request to the CS domain user in the session request message.
  • the media stream information that the IMS domain wants to establish is received, when the final confirmation message of the CS domain user is received, the media stream to be established is established through the feedback result of the message negotiation for the media negotiation in the IMS domain.
  • the second step During the call, the CS domain user or the IMS domain user may initiate media renegotiation. Because the process is consistent, the process only needs the MGCF to perform signaling and bearer conversion on the CS domain and the IMS domain.
  • An embodiment of the present invention further provides an IMS terminal, including: a reserved unit and a conversion unit. a reserved unit, configured to retain a CS domain loading mode during interworking between the CS domain and the IMS domain media stream;
  • the conversion unit is configured to convert the bearer of the IMS domain into a bearer mode of the CS domain, so as to implement interworking of the bearer mode. Further, the converting unit includes at least one of the following subunits: a decomposing subunit, configured to decompose the H.223 multiplexed stream sent from the CS domain into an independent media stream; and the merging subunit, for sending to the CS The independent media streams of the domain are merged into H.223 multiplexed streams.
  • An embodiment of the present invention further provides an IM-MGW, including: a reserved unit and a conversion unit. a reserved unit, configured to retain a CS domain loading mode during interworking between the CS domain and the IMS domain media stream;
  • the conversion unit is configured to convert the bearer of the IMS domain into a bearer mode of the CS domain, so as to implement interworking of the bearer mode. Further, the converting unit includes at least one of the following subunits: a decomposing subunit, configured to decompose the H.223 multiplexed stream flowing from the CS domain to the IMS domain into an independent media stream, and transmit the independent media stream to the IMS terminal.
  • the merging sub-unit is configured to merge the independent media streams flowing from the IMS domain to the CS domain into H.223 multiplexed streams, and transmit the H.223 multiplexed streams to the CS terminal.
  • V Embodiment 1 Corresponding to the above case 1, and the CS domain user initiates a multimedia call to the IMS domain user, as shown in FIG. 13, the following specific steps are included: 1 to 17, the process of the CS user initiating a call to the IMS user, the process completing the initiation, ringing, answering of the call and establishing a service data channel between the users.
  • T Embodiment 2 Corresponding to the above case 1, and the IMS domain user initiates a multimedia call to the CS domain user, as shown in FIG. 14, which includes the following specific steps:
  • Embodiment 3 Corresponding to the above case 2, and the CS domain user initiates a multimedia call to the IMS domain user, as shown in FIG. 15, the following specific steps are included:
  • the CS domain user initiates a multimedia call to the IMS domain user, completing the basic call connection such as originating, ringing, and answering of the call.
  • the IMS domain does not establish a media stream during media negotiation.
  • the CS domain initiates opening (or closing) the media stream channel to the IMS domain, and the IMS domain establishes (or closes) the corresponding media stream through renegotiation.
  • the IMS domain establishes (closes) the media stream to the CS domain through renegotiation, and the CS domain initiates corresponding opening (or closing) of the media stream.
  • the MGCF presupposes a result of media negotiation with the CS domain and replies to the IMS user before responding.
  • the second step (5 to 7) establishes a media stream channel to the CS domain according to the preset media negotiation result in the first step.
  • the third step (8 to 10) the CS domain initiates opening (or closing) the media stream channel to the IMS domain, IMS The domain establishes (or closes) the corresponding media stream through renegotiation. (This process is described in detail in the Signaling Interworking section above.)
  • the IMS domain establishes (closes) the media stream to the CS domain through renegotiation, and the CS domain initiates corresponding opening (or closing) of the media stream.
  • the softswitch technology based on WCDMAR4 (but not limited to WCDMA) has been matured and has been widely applied. At present, a large number of users have made video call services through the multimedia call service provided by the WCDMA R4 CS domain. As a new architecture in WCDMA, IMS represents a future development direction, which also supports multimedia calls. Since IMS is still in the process of development and perfection, it is foreseeable that WCDMAR4-based softswitch technology and IMS will coexist for a relatively long period of time.
  • the embodiment of the present invention interworks the multimedia call between the CS domain and the IMS domain from the two layers of the bearer mode and the media stream.
  • the bearer mode of the CS domain is first reserved, and the bearer of the IMS domain is converted into the bearer mode of the CS domain to implement interworking of the bearer mode; further, the bearer conversion may be completed by the IMS terminal, or by IM-MGW or MGCF is completed.
  • the transmission mode of the CS domain media stream control signaling the interworking between the CS domain and the IMS domain media stream is completed correspondingly; further, the CS domain media stream control signaling transmission mode is in the inband mode through the service data channel. The transmission is carried out or in an out-of-band manner via the call signalling channel.
  • the UE maintains the bearer mode of the CS domain in the process of interworking between the CS domain and the IMS domain media stream, and converts the bearer of the IMS domain into the bearer mode of the CS domain by using the converting unit, Realize the interoperability of the load mode.
  • the UE maintains the bearer mode of the CS domain in the process of interworking between the CS domain and the IMS domain media stream, and converts the bearer of the IMS domain into the CS domain by using the converting unit.
  • the bearer mode is used to implement interworking of bearer modes.
  • the embodiments of the present invention enable multimedia calls between users in the CS domain and the IMS domain architecture, which improves the availability of the equipment of the operator, and facilitates the operator to fully exploit the potential of the existing device. Users in both architectures provide the means to make multimedia calls.
  • the spirit and scope of the invention Thus, it is intended that the present invention cover the modifications and the modifications of the invention.

Abstract

A method and device for achieving the inter-connection of the multimedia calling between the CS domain and the IMS domain, in order to solve the problem of the inter-connection of multimedia calling between the CS domain and the IMS domain to be achieved by the current WCDMA system. The method comprises: holding the bearer mode of CS domain, and translating the bearer mode of IMS domain to the bearer mode of CS domain, in order to achieve the inter-connection of the bearer mode; and completing the inter-connection of the media flow between the CS domain and the IMS domain accordingly, based on the transmission mode of CS domain media flow controlling signaling.

Description

CS域与 IMS域进行多媒体呼叫互通的实现方法及装置 技术领域  Method and device for implementing multimedia call intercommunication between CS domain and IMS domain
本发明涉及通信领域, 特别是涉及 CS域与 IMS域进行多媒体呼叫互通的 实现方法及装置。 背景技术  The present invention relates to the field of communications, and in particular, to a method and apparatus for implementing multimedia call interworking between a CS domain and an IMS domain. Background technique
移动电路域 ( CS DOMAIN ) 多媒体呼叫业务是第三代移动通信系统中的 一项重要业务, 是第三代移动通信区别于第二代的标志性业务之一。 这种业 务使得用户在进行语音通话的同时, 还可以看到对方的图像, 是一项有重要 实际应用价值的业务。  CS DOMAIN Multimedia call service is an important service in the third generation mobile communication system, and it is one of the landmark services of the third generation mobile communication. This kind of business enables users to see the image of the other party while making a voice call, which is a business with important practical application value.
WCDMA第三代移动通信从 R4版本开始 , 定义出了一套系统构架来完成 各种业务, 包括可视电话业务。 此系统构架包含的基本网元为: 用户设备 UE, WCDMA系统基站 NODE B, WCDMA系统基站控制器 RNC, MGW和 MSG SERVER, 该系统构架的一种基本的组网关系参见图 1所示。  The WCDMA third-generation mobile communication began with the R4 version and defined a system architecture to complete various services, including video telephony services. The basic network elements included in this system architecture are: user equipment UE, WCDMA system base station NODE B, WCDMA system base station controller RNC, MGW and MSG SERVER. A basic networking relationship of the system architecture is shown in Figure 1.
UE: 即用户使用的终端设备, 常称为手机。  UE: The terminal device used by the user, often referred to as a mobile phone.
NODE B: 主要负责无线信号收发。  NODE B: Mainly responsible for wireless signal transmission and reception.
RNC: 主要负责无线接入网络的管理。  RNC: Mainly responsible for the management of the wireless access network.
MGW: 主要负责各种承载资源的管理, 进行接网的实际操作。  MGW: Mainly responsible for the management of various bearer resources and the actual operation of the connection network.
MSG SERVER: 是系统的核心, 主要负责各种业务的逻辑控制, 统一调 度各种网络资源, 生成通话记录。  MSG SERVER: It is the core of the system. It is mainly responsible for the logical control of various services, uniformly scheduling various network resources, and generating call records.
a接口: 空口信令通道。  a interface: air interface signaling channel.
b接口: 业务数据通道。  b interface: Business data channel.
c接口: 媒体网关控制信令通道。  c interface: Media gateway control signaling channel.
d接口: BICC/ISUP/SIP信令通道。  d interface: BICC/ISUP/SIP signaling channel.
WCDMA第三代移动通信系统提供了一种称作 Multimedia call(即多媒体 呼叫) 的业务, 这种业务可以完成语音呼叫功能, 数据通讯功能, 也可以完 成可视电话功能。 The WCDMA third-generation mobile communication system provides a service called Multimedia call, which can complete the voice call function and the data communication function. Into the video phone function.
为了实现上述多媒体呼叫业务, 需要用到以下信令及协议:  In order to implement the above multimedia call service, the following signaling and protocols are required:
1、 H.245多媒体通信控制协议: ITU-T制订的 H.245协议定义了如何在 单条业务数据通道内通过一系列协商, 建立多^某体流通道的过程; 规定了 终端能力协商过程 (该过程进行后通讯双方就可以知道对方支持的媒体类型, 如语音、 视频, 等)、 主从判别 (确定主从关系)、 复用控制信息交互(为了 支持在一条业务通道中同时传递多条媒体流)、 打开与关闭媒体流通道等。  1. H.245 Multimedia Communication Control Protocol: The H.245 protocol defined by ITU-T defines how to establish a multi-body flow channel through a series of negotiation within a single service data channel. The terminal capability negotiation process is defined ( After the process is performed, both parties can know the media types supported by the other party, such as voice, video, etc., master-slave discrimination (determination of master-slave relationship), and multiplexing control information interaction (in order to support multiple transmissions in one service channel simultaneously) Media stream), open and close media stream channels, and more.
所述 H.245信令消息主要含两个类别:  The H.245 signaling message mainly includes two categories:
第一是为建立媒体流通道前做准备的信令消息, 包括终端能力发送消息 ( TCS )及响应消息, 主从判别消息(MSD )及响应消息, 复用表发送消息 ( MUXTBS D )及响应消息。  The first is a signaling message prepared for establishing a media stream channel, including a terminal capability transmission message (TSS) and a response message, a master-slave discrimination message (MSD) and a response message, a multiplex table transmission message (MUXTBS D), and a response. Message.
第二是打开和关闭媒体流通道的信令消息, 包括打开媒体流通道消息 The second is to open and close the signaling message of the media stream channel, including opening the media stream channel message.
( OLC )及响应消息, 关闭媒体流通道消息 (CLC )及响应消息。 OLC消息 可一次建立一条前向或一对双向媒体流通道, 若收到对方打开媒体流通道命 令响应 (OLC ACK ) 消息, 则表示双方成功建立了媒体流通道, 若收到的是 打开媒体流通道命令拒绝响应消息(OLC REJECT )或超时没有收到响应, 表 示建立媒体流通道失败。 关闭媒体流通道也需要收到成功的响应消息, 则表 示关闭成功。 (OLC) and response message, close the media stream channel message (CLC) and response message. The OLC message can establish a forward or a pair of bidirectional media stream channels at a time. If the other party opens the media stream channel command response (OLC ACK) message, the two parties successfully establish a media stream channel, and if the received media stream is opened, The channel command reject response message (OLC REJECT) or timeout did not receive a response, indicating that the media stream channel failed to be established. Closing the media stream channel also requires receiving a successful response message, indicating that the shutdown was successful.
2、 H.223低比特率多媒体通信复用协议: ITU-T制订的 H.223协议使通 信双方可以利用单个业务数据通道同时传输多条语音、 视频和数据媒体流, 它需要结合 H.245协同操作。 参见图 2所示, 为 H.223的结构层次示意图, 其应用层(也就是 H.223 的服务对象)是提供和接收各种语音、 视频或数据 的模块(比如: 一个手机终端的麦克风, 显示屏或摄像头), 最下层即物理层 是一条业务数据通道, 从图 2可见, H.223支持利用单条物理通道传递复用的 媒体流。  2. H.223 low bit rate multimedia communication multiplexing protocol: The H.223 protocol developed by ITU-T enables communication parties to simultaneously transmit multiple voice, video and data media streams using a single service data channel. It needs to be combined with H.245. Collaborative operation. Referring to FIG. 2, it is a structural hierarchy diagram of H.223. The application layer (that is, the service object of H.223) is a module that provides and receives various voice, video or data (for example: a microphone of a mobile terminal, The display or camera), the lowest layer, the physical layer is a service data channel. As can be seen from Figure 2, H.223 supports the use of a single physical channel to deliver multiplexed media streams.
目前存在两种所述多媒体呼叫业务的实现方案。  There are currently two implementations of the aforementioned multimedia call service.
方案一: WCDMA第三代移动通信系统电路域中, 多媒体呼叫的建立分 为两个阶段: 第一阶段是按数据业务的方式完成呼叫的接续以及在用户间建 立承载业务通道, 第二阶段, 在应答后, 用户通过终端在承载业务通道中以 带内的方式进行建立媒体流的信令交互, 确定要建立的语音、 视频和(或) 数据媒体流, 这才建立好多媒体呼叫。 由第二阶段建立媒体流的操作完全在 带内进行, 相关信令未经过 MSC SERVER, 因此 MSC SERVER对媒体流通 道的建立情况完全不了解, 不知道用户具体在进行语音、 视频或数据中哪些 媒体类型的通讯。 Solution 1: The establishment of multimedia call in the circuit domain of WCDMA third-generation mobile communication system There are two phases: The first phase is to complete the connection of the call in the manner of data service and establish the bearer service channel between the users. In the second phase, after the response, the user establishes the inband mode in the bearer service channel through the terminal. The signaling interaction of the media stream determines the voice, video, and/or data media streams to be established, which establishes the multimedia call. The operation of establishing the media stream in the second phase is completely carried out in the band, and the related signaling does not pass through the MSC SERVER. Therefore, the MSC SERVER does not know the establishment of the media stream channel completely, and does not know which of the voice, video or data the user specifically performs. Media type communication.
方案二: WCDMA第三代移动通信系统电路域中的另一种多媒体呼叫的 实现方法还可以将媒体流协商的过程从在带内进行改为在带外进行。 通过扩 展空口信令以及中继信令来实现, 有两种基本的方法: 一种方法是让空口信 令以及中继信令支持 H.245 消息的传递, 用户可基本按现有多媒体呼叫的方 法建立多媒体呼叫, 主要不同点在于 H.245 消息是通过带外传递的; 另一种 方法是在空口信令以及中继信令中增加用于媒体流协商的信元, 在发起呼叫: 的消息中携带主叫方要建立的媒体流的类型、 条数、 编解码以及复用控制参 数等信息。 让网络或被叫在振铃消息或呼叫进展消息中返回接受的媒体流信 息以及选择使用的编解码等信息, 在呼叫应答时建立起媒体流, 实现多媒体 呼叫的功能。  Solution 2: The implementation method of another multimedia call in the circuit domain of the WCDMA third generation mobile communication system can also change the process of media stream negotiation from in-band to out-of-band. There are two basic methods to implement by extending air interface signaling and relay signaling: One method is to allow air interface signaling and relay signaling to support the delivery of H.245 messages, and the user can basically press the existing multimedia call. The method establishes a multimedia call. The main difference is that the H.245 message is transmitted through the outband. Another method is to add a cell for media stream negotiation in the air interface signaling and the relay signaling, initiating the call: The message carries information such as the type, number of pieces, codec, and multiplexing control parameters of the media stream to be established by the calling party. Let the network or the called party return the received media stream information and the selected codec and the like in the ringing message or the call progress message, and establish a media stream when the call is answered, and realize the function of the multimedia call.
IMS是 WCDMAR5版本提出的一种新的基于 IP的构架, 它基于 SIP, 提供 T一套新的会话管理机制。 IMS系统为会话中的媒体协商提供多次机会, 一次 是在会话建立过程就可以确定, 但用户可能希望在通话过程中修改已经建立 的媒体(比如, 会话建立过程中时只建立有语音流, 后来希望进行视频通话, 需要增加视频媒体流)。 IMS支持媒体重协商过程, 该过程使得 IMS域用户能 够为已经建立的会话增加、 修改或删除媒体流。  IMS is a new IP-based architecture proposed by WCDMAR5. It is based on SIP and provides a new session management mechanism. The IMS system provides multiple opportunities for media negotiation in a session, one can be determined during the session establishment process, but the user may wish to modify the established media during the call (for example, only the voice stream is established during the session establishment process, Later I wanted to make a video call and I needed to increase the video media stream). The IMS supports a media renegotiation process that enables IMS domain users to add, modify, or delete media streams for established sessions.
发明人在发明过程中发现, 现有 WCDMA系统没有提供 CS域与 IMS域进 行多媒体呼叫互通的实现方法。 发明内容 本发明实施例提供 CS域与 IMS域进行多媒体呼叫互通的实现方法及装 置, 以实现 CS域与 IMS域的多媒体呼叫互通。 The inventor found in the process of the invention that the existing WCDMA system does not provide an implementation method for the multimedia call intercommunication between the CS domain and the IMS domain. Summary of the invention The embodiment of the invention provides a method and a device for implementing a multimedia call intercommunication between a CS domain and an IMS domain, so as to implement intercommunication of multimedia calls between the CS domain and the IMS domain.
本发明实施例的方法包括下列步骤: 保留 CS域的承载方式, 并将 IMS 域的承载转换为 CS域的承载方式, 以实现承载方式的互通; 以及才艮据 CS域 媒体流控制信令的传输方式, 相应完成 CS域与 IMS域媒体流的互通。  The method of the embodiment of the present invention includes the following steps: the bearer mode of the CS domain is reserved, and the bearer of the IMS domain is converted into the bearer mode of the CS domain to implement interworking of the bearer mode; The transmission mode completes the interworking between the CS domain and the IMS domain media stream.
本发明实施例的一种 IMS终端, 包括: 保留单元, 用于在 CS域与 IMS 域媒体流互通的过程中, 保留 CS域的承载方式; 转换单元, 用于将 IMS域 的承载转换为 CS域的承载方式, 以实现承载方式的互通。  An IMS terminal according to an embodiment of the present invention includes: a reservation unit, configured to retain a bearer mode of a CS domain in a process of interworking between a CS domain and an IMS domain media stream; and a converting unit, configured to convert the bearer of the IMS domain into a CS The bearer mode of the domain to implement interworking of bearer modes.
本发明实施例的一种 IP多媒体媒体网关功能实体, 包括: 保留单元, 用 于在 CS域与 IMS域媒体流互通的过程中,保留 CS域的承载方式;转换单元, 用于将 IMS域的承载转换为 CS域的承载方式, 以实现承载方式的互通。  An IP multimedia media gateway functional entity according to an embodiment of the present invention includes: a retaining unit, configured to retain a CS domain bearer mode in a process of interworking between a CS domain and an IMS domain media stream; and a converting unit, configured to: The bearer is converted to the bearer mode of the CS domain to implement interworking in the bearer mode.
本发明实施例中, 由于保留 CS域的承载方式, 并将 IMS域的承载转换 为 CS域的承载方式, 所以实现了承载方式的统一,使得 CS域和 IMS域构架 下的用户之间可进行多媒体呼叫。 附图说明  In the embodiment of the present invention, the bearer mode of the CS domain is reserved, and the bearer of the IMS domain is converted into the bearer mode of the CS domain, so that the bearer mode is unified, so that users in the CS domain and the IMS domain framework can perform Multimedia call. DRAWINGS
图 1为现有 WCDMA通信系统的构架示意图;  1 is a schematic structural diagram of an existing WCDMA communication system;
图 2为现有 H.223的结构层次示意图;  Figure 2 is a schematic diagram showing the structure of the existing H.223;
图 3为本发明实施例的方法步骤流程图;  3 is a flow chart of steps of a method according to an embodiment of the present invention;
图 4为本发明实施例中由 IMS终端转换 CS域和 IMS域的承载方式的示 意图;  4 is a schematic diagram of a bearer mode of converting an CS domain and an IMS domain by an IMS terminal according to an embodiment of the present invention;
图 5为本发明实施例中由 MGCF转换 CS域和 IMS域的承载方式的示意 图;  FIG. 5 is a schematic diagram of a bearer mode of converting a CS domain and an IMS domain by an MGCF according to an embodiment of the present invention;
图 6为本发明实施例中情况二的信令流程图;  6 is a signaling flowchart of case 2 in the embodiment of the present invention;
图 7为本发明实施例中情况二中 CS域向 IMS域发起重协商正常情况下 的信令流程图;  7 is a signaling flowchart of a normal situation in which a CS domain initiates renegotiation to an IMS domain in Case 2 according to an embodiment of the present invention;
图 8为本发明实施例中情况二中 CS域向 IMS域发起重协商异常情况下 的信令流程图; FIG. 8 is a schematic diagram of the case where the CS domain initiates a renegotiation abnormality to the IMS domain in the second case according to the embodiment of the present invention. Signaling flow chart;
图 9为本发明实施例中情况二中 IMS域向 CS域发起重协商正常情况下 的信令流程图;  9 is a signaling flowchart of a normal situation in which the IMS domain initiates renegotiation to the CS domain in the second case in the second embodiment of the present invention;
图 10为本发明实施例中情况二中 IMS域向 CS域发起重协商异常情况 1 下的信令流程图;  10 is a signaling flowchart of the IMS domain initiating a renegotiation exception 1 to the CS domain in Case 2 of the embodiment of the present invention;
图 11为本发明实施例中情况二中 IMS域向 CS域发起重协商异常情况 2 下的信令流程图;  FIG. 11 is a signaling flowchart of the IMS domain initiating a renegotiation abnormality 2 to the CS domain in the second case according to the embodiment of the present invention;
图 12为本发明实施例中情况三的信令流程图;  12 is a signaling flowchart of case 3 in the embodiment of the present invention;
图 13为本发明实施例一的信令流程图;  13 is a signaling flowchart of Embodiment 1 of the present invention;
图 14为本发明实施例二的信令流程图;  14 is a signaling flowchart of Embodiment 2 of the present invention;
图 15为本发明实施例三的信令流程图;  15 is a signaling flowchart of Embodiment 3 of the present invention;
图 16为本发明实施例四的信令流程图。 具体实施方式  FIG. 16 is a signaling flowchart of Embodiment 4 of the present invention. detailed description
为了使 CS域和 IMS域构架下的用户之间可进行多媒体呼叫 ,实现 CS域 与 IMS域的多媒体呼叫互通, 本发明实施例提供了一种 CS域与 IMS域进行 多媒体呼叫互通的实现方法, 参见图 3所示, 包括下列主要步骤:  In order to enable a multimedia call between the user in the CS domain and the IMS domain to implement the multimedia call intercommunication between the CS domain and the IMS domain, the embodiment of the present invention provides a method for implementing multimedia call interworking between the CS domain and the IMS domain. See Figure 3, which includes the following main steps:
51、 保留 CS i或的承载方式。  51. Keep the CS i or the bearer mode.
CS域的承载方式保持不变, 仍然采用 H.223复用方式。  The bearer mode of the CS domain remains unchanged, and the H.223 multiplexing mode is still adopted.
52、 将 IMS域的承载转换为 CS域的承载方式。  52. Convert the bearer of the IMS domain to the bearer mode of the CS domain.
本发明实施例提供两种将 IMS域承载转换为 CS域承载的方式, 以实现 承载方式的互通。  The embodiments of the present invention provide two ways to convert an IMS domain bearer into a CS domain bearer to implement interworking of bearer modes.
承载转换方式一: 参见图 4所示, 由 IMS终端转换 CS域和 IMS域的承 载方式。  Bearer conversion mode 1: As shown in Figure 4, the loading mode of the CS domain and the IMS domain is converted by the IMS terminal.
在 IMS终端侧, 包括: IMS终端将从 CS域发来的 H.223复用流分解为 独立的媒体流; 以及 IMS终端将发往 CS域的独立媒体流合并为 H.223复用 流。 在 IMS网络侧, 为每个多媒体呼叫建立一条业务通道, 并以 H.223复用 方式透传媒体流, 来模拟 CS域的承载方式。 从而以实现承载方式的互通。 On the IMS terminal side, the method includes: the IMS terminal decomposes the H.223 multiplexed stream sent from the CS domain into independent media streams; and the IMS terminal merges the independent media streams sent to the CS domain into the H.223 multiplexed stream. On the IMS network side, a service channel is established for each multimedia call, and the media stream is transparently transmitted in the H.223 multiplexing mode to simulate the bearer mode of the CS domain. Therefore, the interworking of the bearer mode is implemented.
承载转换方式二: 参见图 5所示, 由媒体网关控制功能实体 MGCF或 IP 多媒体媒体网关功能实体 IM-MGW转换 CS域和 IMS域的; ^载方式。  Bearer conversion mode 2: Referring to FIG. 5, the media gateway control function entity MGCF or the IP multimedia media gateway function entity IM-MGW converts the CS domain and the IMS domain;
本承载转换方式中, 维持原有的 IMS域承载方式(即采用单独传输各条 媒体流), 在 MGCF或 IM-MGW实现 CS域与 IMS域承载方式的互相转换。 所述 MGCF或 IM-MGW转换 CS域和 IMS域的承载方式包括: MGCF或 IM-MGW将从 CS域流向 IMS域的 H.223复用流分解为独立的媒体流, 并将 独立的媒体流向 IMS终端传送; 以及 MGCF或 IM-MGW将从 IMS域流向 CS域的独立媒体流合并为 H.223复用流,并将 H.223复用流向 CS终端传送。  In the bearer switching mode, the original IMS domain bearer mode is maintained (that is, each media stream is separately transmitted), and the CS domain and the IMS domain bearer mode are mutually converted in the MGCF or the IM-MGW. The bearer mode of the MGCF or the IM-MGW to convert the CS domain and the IMS domain includes: The MGCF or the IM-MGW decomposes the H.223 multiplexed stream flowing from the CS domain to the IMS domain into independent media streams, and flows independent media. The IMS terminal transmits; and the MGCF or IM-MGW merges the independent media streams flowing from the IMS domain to the CS domain into H.223 multiplexed streams, and transmits the H.223 multiplexed streams to the CS terminal.
53、 确定 CS域媒体流控制信令的传输方式。  53. Determine a transmission mode of the CS domain media stream control signaling.
CS域采用 BICC/ISUP进行呼叫控制, IMS域采用 SIP进行会话控制。 虽 然两个域所采用信令类型不同, 但呼叫流程是有共同点的: 都存在呼叫 (会 话) 的发起、 振铃、 应答以及拆线操作。 呼叫接续过程可直接互通, 其过程 可参见 3GPP TS 24.228关于 CS与 IMS互通的章节。  The CS domain uses BICC/ISUP for call control, and the IMS domain uses SIP for session control. Although the signaling types used by the two domains are different, the call flows have in common: There are call (session) initiation, ringing, answering, and disconnection operations. The call connection process can be directly interworked. The procedure can be found in the 3GPP TS 24.228 chapter on CS and IMS interworking.
CS域与 IMS域多媒体呼叫(会话 )的主要不同点在于确立媒体流通道的 方式不同。依据 CS域媒体流控制信令传输方式的不同,媒体流的互通有不同 的处理。  The main difference between the CS domain and the IMS domain multimedia call (session) is the way in which the media stream channel is established. The media stream interworking has different processing depending on the CS domain media stream control signaling transmission mode.
CS域媒体流控制信令的传输方式一: 在 CS域中所述媒体流控制信令通 过业务数据通道以带内的方式进行传输。  Transmission mode of CS domain media stream control signaling 1: The media stream control signaling in the CS domain is transmitted in an in-band manner through the service data channel.
CS域媒体流控制信令的传输方式二: 在 CS域中所述媒体流控制信令通 过呼叫信令通道以带外方式进行传输。  Transmission mode of CS domain media stream control signaling: The media stream control signaling in the CS domain is transmitted in an out-of-band manner through a call signaling channel.
54、 相应完成 CS域与 IMS域媒体流的互通。  54. The interworking of the CS domain and the IMS domain media stream is completed accordingly.
将上述步骤 S2中的两种承载转换方式、步骤 S3中的两种 CS域媒体流控 制信令的传输方式, 以及发起多媒体呼叫方(CS域用户发起, 或 IMS域用户 发起)相互组合, 包括但不限于以下七种情况。  Combining the two bearer conversion modes in the foregoing step S2, the transmission manners of the two CS domain media flow control signaling in step S3, and the initiating multimedia calling party (CS domain user initiated, or IMS domain user initiated), including But not limited to the following seven situations.
*情况一: 由 IMS终端转换 CS域和 IMS域的承载方式; 在 CS域中所述 媒体流控制信令通过业数据务通道以带内的方式进行传输; 从 CS域向 IMS 域发起多媒体呼叫, 或从 IMS域向 CS域发起多媒体呼叫, 互通处理包括下 列步骤: *Case 1: The bearer mode of the CS domain and the IMS domain is converted by the IMS terminal; The media stream control signaling is transmitted in an in-band manner through the industry data channel; the multimedia call is initiated from the CS domain to the IMS domain, or the multimedia call is initiated from the IMS domain to the CS domain, and the interworking process includes the following steps:
第一步、 参照 CS域与 IMS域进行语音呼叫互通的方式完成呼叫发起、 振铃和应答等常规 CS域呼叫接续的处理,在用户间建立一条透明的业务通道 (用于传输语音、 视频等媒体流)。  The first step is to complete the processing of the conventional CS domain call connection such as call origination, ringing, and answering by referring to the CS domain and the IMS domain for voice call interworking, and establish a transparent service channel between the users (for transmitting voice, video, etc.) Media stream).
第二步、 CS域与 IMS域通讯各方在已经建立的业务通道内按 H.245规定 的方式进行建立和关闭媒体流等媒体流操作, 进行多媒体通讯。  In the second step, the CS domain and the IMS domain communication parties perform media stream operations such as media stream establishment and closing in the established service channel according to the method specified in H.245, and perform multimedia communication.
第三步、 呼叫结束时释放传输资源, 完成拆线处理。  The third step is to release the transmission resource when the call ends, and complete the disconnection process.
*情况二: 由 MGCF转换 CS域和 IMS域的承载方式; 在 CS域中所述媒 体流控制信令通过业务数据通道以带内的方式进行传输; 从 CS域向 IMS域 发起多媒体呼叫, 参见图 6所示, 互通处理包括下列步骤:  * Case 2: The bearer mode of the CS domain and the IMS domain is converted by the MGCF; the media stream control signaling in the CS domain is transmitted in an in-band manner through the service data channel; and the multimedia call is initiated from the CS domain to the IMS domain, see As shown in Figure 6, the interworking process includes the following steps:
第一步: CS域用户向 IMS域用户发起多媒体呼叫, 完成呼叫的发起、 振 铃、应答等基本呼叫接续。 MGCF收到 CS域的多媒体呼叫请求后, 在向 IMS 域发起呼叫时可选择暂不建立媒体流(原因在于 CS域要求在应答后才可以进 行媒体协商:), 或者建立从 MGCF到 IMS用户间的媒体流(因为用户通常会 建立语音和 /或视频等媒体流, 只是 CS域建立这些媒体流的时机在此之后)。  Step 1: The CS domain user initiates a multimedia call to the IMS domain user, completing the basic call connection such as initiation, ringing, and answering of the call. After receiving the multimedia call request of the CS domain, the MGCF may choose not to establish a media stream when initiating a call to the IMS domain (because the CS domain requires the media negotiation after the response:), or establish a connection from the MGCF to the IMS user. Media stream (because users usually establish media streams such as voice and/or video, just after the CS domain establishes these media streams).
第二步: 呼叫 (会话)应答后, 若第一步 IMS侧建立了媒体流, 则在此 时建立 CS侧的相应媒体流, 并将 IMS侧与 CS侧的媒体流相连, 以提供用户 完整的媒体流通道, 若建立失败则通过重协商流程拆除 IMS的相应媒体流。  Step 2: After the call (session) is answered, if the media stream is established on the IMS side, the corresponding media stream on the CS side is established at this time, and the media stream on the CS side is connected to the IMS side to provide the user complete. The media stream channel, if the establishment fails, the corresponding media stream of the IMS is removed through the renegotiation process.
第三步: 通话过程中, CS域可能向 MS域发起打开(或关闭)媒体流通 道的操作, MGCF通过重协商在 IMS域建立 (或关闭)相应媒体流。  Step 3: During the call, the CS domain may initiate an operation to open (or close) the media channel to the MS domain, and the MGCF establishes (or closes) the corresponding media stream in the IMS domain through renegotiation.
本步骤中所述重协商存在正常情况和异常情况。  There are normal conditions and abnormal conditions in the renegotiation described in this step.
参见图 7所示(说明: 图中 MGCF以右的媒体重协商流程可以是 3GPP 规定的任何版本, 不限于图示的流程, 下同 ), 所述重协商的正常情况, 包括 下列步骤:  Referring to FIG. 7 (Description: The MGCF right media re-negotiation process in the figure may be any version specified by the 3GPP, not limited to the illustrated flow, the same below), and the normal situation of the renegotiation includes the following steps:
1、 CS域向 IMS域发起打开(或关闭)媒体流通道。 2到 13、 MGCF代理 CS域完成 IMS域的媒体流增加(或减少) 的媒体 重协商操作。 1. The CS domain initiates opening (or closing) the media stream channel to the IMS domain. 2 to 13, the MGCF proxy CS domain completes the media renegotiation operation of increasing (or decreasing) the media stream of the IMS domain.
14、 MGCF向 CS域回复打开(或关闭)媒体流通道成功响应消息。  14. The MGCF replies to the CS domain to open (or close) the media stream channel success response message.
参见图 8所示, 所述重协商的异常情况中, 在 CS域向 IMS域发起打开 (或关闭)媒体流通道后, 若 IMS发生超时或其它任何失败, 由 MGCF向 CS域回复打开(或关闭)媒体流通道拒绝响应。  Referring to FIG. 8, in the abnormal situation of the renegotiation, after the CS domain initiates opening (or closing) the media stream channel to the IMS domain, if the IMS times out or any other failure, the MGCF replies to the CS domain (or Close) The media stream channel refuses to respond.
第四步: 通话过程中, IMS域可能通过重协商向 CS域建立(关闭)媒体 流, MGCF操控 CS域打开(或关闭)媒体流。  Step 4: During the call, the IMS domain may establish (close) the media stream to the CS domain through renegotiation, and the MGCF controls the CS domain to open (or close) the media stream.
本步骤中所述重协商存在正常情况和两种异常情况。  There are normal conditions and two abnormal conditions in the renegotiation described in this step.
参见图 9所示, 所述重协商的正常情况, 包括下列步骤:  Referring to FIG. 9, the normal situation of the renegotiation includes the following steps:
1、 IMS域向 CS域发起打开 (或关闭)媒体流通道。  1. The IMS domain initiates opening (or closing) the media stream channel to the CS domain.
2到 4、MGCF代理 IMS域完成 CS域的媒体流打开(或关闭),如果 INVITE 消息中的 SDP表明需要对多个媒体流进行处理, 那么本步需要重复执行, 直 到所有媒体流的操作处理完成。  2 to 4, the MGCF proxy IMS domain completes the media stream of the CS domain to be opened (or closed). If the SDP in the INVITE message indicates that multiple media streams need to be processed, this step needs to be repeated until all media streams are processed. carry out.
5到 14、 MGCF代理 CS域完成 IMS域后续媒体协商过程。  5 to 14, the MGCF proxy CS domain completes the subsequent media negotiation process of the IMS domain.
参见图 10所示, 所述重协商的第一种异常情况中, 在 IMS域向 CS域发 起打开媒体流通道后, 若 CS域发生超时或回复拒绝消息, 由 MGCF按已有 规定进行媒体重协商的失败处理。  Referring to FIG. 10, in the first abnormal situation of the renegotiation, after the IMS domain initiates the opening of the media stream channel to the CS domain, if the CS domain times out or replies to the reject message, the MGCF performs media weight according to the existing regulations. Negotiation failure processing.
参见图 11所示, 所述重协商的第二种异常情况中, 在 IMS域向 CS域发 起建立媒体流通道并收到成功响应消息后,若 IMS发生超时或其它任何失败, 由 MGCF向 CS域发起关闭已打开(或关闭) 的媒体流通道处理。  Referring to FIG. 11, in the second abnormal situation of the renegotiation, after the IMS domain initiates the establishment of the media stream channel to the CS domain and receives the success response message, if the IMS times out or any other failure, the MGCF to the CS The domain initiates the closing of the media stream channel processing that is turned on (or turned off).
第五步: 呼叫结束时拆线。  Step 5: Disassemble the line at the end of the call.
本情况中, 第三步和笫四步没有固定的先后关系, 并且第三步和第四可 以在拆线前多次发起。  In this case, the third step and the fourth step have no fixed sequence relationship, and the third step and the fourth step can be initiated multiple times before the line is disconnected.
*情况三: 由 MGCF转换 CS域和 IMS域的承载方式; 在 CS域中所述媒 体流控制信令通过业务数据通道以带内的方式进行传输; 从 IMS域向 CS域 发起多媒体呼叫, 参见图 12所示, 互通处理包括下列步骤: 第一步、 呼叫 (会话)建立阶段, 完成呼叫的发起、 振铃、 应答等基本 呼叫接续。 当从 IMS域向 CS域发起多媒体呼叫时, 由于 CS域媒体流通道的 建立必须在应答后才开始进行, 而 IMS域按正常的处理会在发起会话时就开 始进行媒体流的协商, 并且要求媒体协商在被叫应答前就得到确认并完成媒 体协商。 由于两个域媒体协商的时机的不一致, 因此当 IMS在发起会话进行 媒体协商时, MGCF只能先预先假设出一种与 CS域进行媒体协商的结果,在 应答前回复 IMS用户,以顺应 IMS会话流程,而真正的协商在应答后再在 IMS 与 CS间进行。 *Case 3: The bearer mode of the CS domain and the IMS domain is converted by the MGCF; the media stream control signaling in the CS domain is transmitted in the inband mode through the service data channel; the multimedia call is initiated from the IMS domain to the CS domain, see As shown in Figure 12, the interworking process includes the following steps: The first step, the call (session) establishment phase, completes the basic call connection of the originating, ringing, and answering of the call. When a multimedia call is initiated from the IMS domain to the CS domain, the establishment of the media stream channel of the CS domain must be started after the response, and the normal processing of the IMS domain starts the negotiation of the media stream when the session is initiated, and requires The media negotiation is confirmed and the media negotiation is completed before the called party answers. Because the timing of the negotiation between the two domains is inconsistent, when the IMS initiates the media negotiation, the MGCF can only presuppose a result of media negotiation with the CS domain, and reply the IMS user before the response to comply with the IMS. The session process, while the real negotiation takes place between the IMS and the CS after the response.
MGCF可以如下假设与 CS域的媒体协商结果:  The MGCF can assume the result of media negotiation with the CS domain as follows:
i) MGCF接受 IMS用户发起建立的从 IMS到 CS的媒体流, 拒绝 IMS用 户发起建立的从 CS到 IMS的媒体流。 (因为 CS域用户有可能愿意接受来自 IMS的媒体流, 只是流程上还未到 CS域表达意愿的阶段, 如果 MGCF此时 拒绝从 IMS到 CS的媒体流, 那么到了后面真正协商媒体流时, IMS用户不 得不在一次会话中重复表达两次希望建立从 IMS到 CS媒体流的意愿, 用户 体验不好。 因此, MGCF先假定 CS域用户愿意接受, 即使 CS域用户在后面 真正决定不愿意接受此类媒体流, MGCF也可以在此时通过向 IMS用户发起 重协商来关闭此媒体流。而从 CS域到 IMS域方向的媒体流可以由 CS域用户 主动发起并建立, 因此 MGCF可以在 IMS初次媒体协商时拒绝该方向的媒体 流)。  i) The MGCF accepts the media stream from the IMS to the CS initiated by the IMS user, and rejects the media stream from the CS to the IMS initiated by the IMS user. (Because the CS domain user may be willing to accept the media stream from the IMS, but the process has not yet reached the stage of expressing the willingness of the CS domain. If the MGCF rejects the media stream from the IMS to the CS at this time, then when the media stream is actually negotiated later, The IMS user has to repeatedly express the desire to establish a media stream from IMS to CS in one session, and the user experience is not good. Therefore, the MGCF first assumes that the CS domain user is willing to accept, even if the CS domain user actually decides not to accept this later. For the class media stream, the MGCF may also close the media stream by initiating renegotiation to the IMS user at this time. The media stream from the CS domain to the IMS domain may be initiated and established by the CS domain user, so the MGCF may be in the IMS for the first time. The media stream in the direction is rejected during media negotiation).
ii) MGCF拒绝 IMS用户希望的所有媒体流。  Ii) The MGCF rejects all media streams that the IMS user wants.
iii) MGCF接受 IMS用户希望的所有媒体流。  Iii) The MGCF accepts all media streams desired by the IMS subscriber.
第二步、 MGCF按照第一步的预先假设的协商结果建立到 CS域的媒体 流, 如果有需要建立的媒体流, 并且如果建立失败, 则 MGCF在 IMS域发起 重协商拆除已经建立的相应的媒体流。  In the second step, the MGCF establishes a media stream to the CS domain according to the pre-assumed negotiation result of the first step. If there is a media stream that needs to be established, and if the establishment fails, the MGCF initiates renegotiation in the IMS domain to tear down the corresponding established Media stream.
第三步、 通话过程中, CS域可能向 IMS域发起打开(或关闭)媒体流通 道的操作, MGCF通过重协商在 IMS域建立 (或关闭)相应媒体流。  In the third step, during the call, the CS domain may initiate an operation of opening (or closing) the media circulation channel to the IMS domain, and the MGCF establishes (or closes) the corresponding media stream in the IMS domain through renegotiation.
第四步: 通话过程中 , IMS域可能通过重协商向 CS域建立(关闭)媒体 流, MGCF操控 CS域打开(或关闭)媒体流。 Step 4: During the call, the IMS domain may establish (close) the media to the CS domain through renegotiation. Stream, MGCF manipulates the CS domain to open (or close) the media stream.
第五步、 呼叫结束时拆线。  The fifth step is to disconnect the line at the end of the call.
本情况中, 第三步和第四步没有固定的先后关系, 并且第三步和第四可 以在拆线前多次发起。  In this case, the third step and the fourth step have no fixed sequence relationship, and the third step and the fourth step can be initiated multiple times before the line is disconnected.
*情况四: 由 IMS终端转换 CS域和 IMS域的承载方式; 在 CS域中所述 媒体流控制信令通过呼叫信令通道以带外方式进行传输; 所述媒体流控制信 令信息以 H.245的形式表达; 从 CS域向 IMS域发起多媒体呼叫, 互通处理 包括下列步骤:  *Case 4: The bearer mode of the CS domain and the IMS domain is converted by the IMS terminal; the media stream control signaling in the CS domain is transmitted in an outband manner through the call signaling channel; the media stream control signaling information is in the H Formal expression of .245; Initiating a multimedia call from the CS domain to the IMS domain, the interworking process includes the following steps:
第一步、 CS域用户向 IMS域用户发起多媒体呼叫, 完成呼叫的发起、 振 铃、 应答等基本呼叫接续。 IMS 域在呼叫发起时可选择不建立媒体流(原因 在于 CS域在发起呼叫的 IAM消息中不会携带媒体流信息),或者选择建立缺 省的媒体流(因为通常用户在后来的呼叫过程中会建立语音和 (或视频等) 媒体流)。 发起呼叫后的呼叫建立过程中, CS域用户可能已经发起建立媒体 流通道的操作,但由于 IMS需要在应答后才能够开始媒体重协商过程, 因此, MGCF可选择暂时拒绝这些来自 CS域用户的这些请求或暂时按假设 IMS域 用户接受这些请求的方式来处理, 先建立 CS域到 MGCF的媒体流通道。  In the first step, the CS domain user initiates a multimedia call to the IMS domain user, and completes the basic call connection such as initiation, ringing, and answering of the call. The IMS domain may choose not to establish a media stream when the call is initiated (because the CS domain does not carry the media stream information in the IAM message that initiated the call), or choose to establish a default media stream (because usually the user is in the process of subsequent calls) Voice and (or video, etc.) media streams are created. During the call setup process after the call is initiated, the CS domain user may have initiated the operation of establishing the media stream channel, but since the IMS needs to be able to start the media renegotiation process after the response, the MGCF may choose to temporarily reject these users from the CS domain. These requests are temporarily processed in a manner that assumes that the IMS domain user accepts these requests, first establishing a media stream channel from the CS domain to the MGCF.
第二步: 被叫用户应答后, MGCF综合 CS侧或 IMS侧所建立的媒体流 通道的情况, 若存在某些媒体通道尚未完成, 即只存在 CS侧或 IMS侧的媒 体流通道, 则由 MGCF建立到另一侧的媒体通道, 并将两侧的媒体流相连, 以提供用户完整的媒体流通道, 若建立失败则通过重协商流程拆除已经建立 的另一侧的相应媒体流。  The second step: after the called user answers, the MGCF integrates the media stream channel established by the CS side or the IMS side. If some media channels are not completed, that is, only the media stream channel of the CS side or the IMS side exists, The MGCF establishes a media channel to the other side, and connects the media streams on both sides to provide a complete media stream channel for the user. If the establishment fails, the corresponding media stream on the other side that has been established is removed through the renegotiation process.
第三步: 后续的在通话过程中的媒体流重协商过程, 以及呼叫结束时的 拆线过程, 与上述情况二中的步骤三至步骤五基本相同, 不同在于 H.245 消 息是通道带外通道传送的。  Step 3: The subsequent media stream re-negotiation process during the call and the disconnection process at the end of the call are basically the same as steps 3 to 5 in the above case 2, except that the H.245 message is out of band. Channel transfer.
*情况五: 由 IMS终端转换 CS域和 IMS域的承载方式; 在 CS域中所述 媒体流控制信令通过呼叫信令通道以带外方式进行传输; 所述媒体流控制信 令信息以 H.245的形式表达; 从 IMS域向 CS域发起多媒体呼叫, 互通处理 包括下列步骤: *Case 5: The bearer mode of the CS domain and the IMS domain is converted by the IMS terminal; the media stream control signaling in the CS domain is transmitted in an outband manner through the call signaling channel; the media stream control signaling information is in the H Formal expression of .245; initiate multimedia call from IMS domain to CS domain, interworking Includes the following steps:
第一步: 呼叫 (会话)建立阶段, 完成呼叫的发起、 振铃、 应答等基本 呼叫接续操作。 当从 IMS域向 CS域发起多媒体呼叫 (会话) 时, IMS域按 正常的处理会在发起会话时就携带媒体流参信息开始进行媒体流的协商, 并 且要求媒体协商在被叫应答前就得到确认并完成媒体协商。 MGCF在收到 IMS 向 CS域的多媒体呼叫请求时, 需要呼叫应答前向就发起到 CS域的媒体流通 道建立过程, 依据建立成功与否的结果向 IMS侧进行回复。  Step 1: The call (session) setup phase completes the basic call connection operation such as call initiation, ringing, and answer. When a multimedia call (session) is initiated from the IMS domain to the CS domain, the IMS domain initiates the media stream negotiation by carrying the media stream parameter information when the session is initiated, and requires the media negotiation to obtain the response before the called party answers. Confirm and complete media negotiation. When receiving the multimedia call request from the IMS to the CS domain, the MGCF needs to initiate a media channel establishment process to the CS domain in response to the call response, and respond to the IMS side according to the result of the success or failure of the establishment.
第二步: 后续的在通话过程中的媒体流重协商过程, 以及呼叫结束时的 拆线过程, 与上述情况二中的步骤三至步骤五基本相同, 不同在于 H.245 消 息是通过带外通道传送的。  Step 2: The subsequent media stream re-negotiation process during the call and the disconnection process at the end of the call are basically the same as steps 3 to 5 in the above case 2, except that the H.245 message is passed out of band. Channel transfer.
*情况六: 由 IMS终端转换 CS域和 IMS域的承载方式; 在 CS域中所述 媒体流控制信令通过呼叫信令通道以带外方式进行传输; 所述媒体流控制信 令信息通过与呼叫控制信令捆绑的方式传递; 从 CS域向 IMS域发起多媒体 呼叫, 互通处理包括下列步骤:  *Case 6: The bearer mode of the CS domain and the IMS domain is converted by the IMS terminal; the media stream control signaling in the CS domain is transmitted in an outband manner through the call signaling channel; the media stream control signaling information is passed The call control signaling is bundled and transmitted; the multimedia call is initiated from the CS domain to the IMS domain, and the interworking process includes the following steps:
第一步: CS域用户向 IMS域用户发起多媒体呼叫, 完成呼叫的发起、 振 铃、应答等基本呼叫接续。 CS域在向 IMS域发起呼叫时会携带媒体信息开始 进行媒体协商, 这与 IMS域的媒体协商过程是一致的, 因此, 只需要 MGCF 在向 IMS域用户发起会话请求时, 在会话请求消息中携带 CS域希望建立的 媒体流信息, 在收到 IMS域用户最终确认消息时, 通过 CS域的振铃或呼叫 进展消息向 CS域反馈协商结果, 确立要建立的媒体流。  Step 1: The CS domain user initiates a multimedia call to the IMS domain user, completing the basic call connection such as initiation, ringing, and answering of the call. When the CS domain initiates a call to the IMS domain, it will carry the media information to start the media negotiation. This is consistent with the media negotiation process of the IMS domain. Therefore, only the MGCF needs to initiate a session request to the IMS domain user in the session request message. The media stream information that the CS domain wants to establish, when receiving the final confirmation message of the IMS domain user, feeds back the negotiation result to the CS domain through the ringing or call progress message of the CS domain, and establishes the media stream to be established.
第二步:在通话过程中, CS域用户或 IMS域用户可能会发起媒体重协商, 由于流程一致, 该过程只需要 MGCF对 CS域和 IMS域进行信令和承载上的 转换即可。  The second step: During the call, the CS domain user or the IMS domain user may initiate media renegotiation. Because the process is consistent, the process only needs the MGCF to perform signaling and bearer conversion on the CS domain and the IMS domain.
*情况七: 由 IMS终端转换 CS域和 IMS域的承载方式; 在 CS域中所述 媒体流控制信令通过呼叫信令通道以带外方式进行传输; 所述媒体流控制信 令信息通过与呼叫控制信令梱绑的方式传递; 从 IMS域向 CS域发起多媒体 呼叫, 互通处理包括下列步驟: 第一步: IMS域用户向 CS域用户发起多媒体呼叫, 完成呼叫的发起、振 铃、应答等基本呼叫接续。 IMS域在向 CS域发起呼叫时会携带媒体信息开始 进行媒体协商, 这与 IMS域的媒体协商过程是一致的, 因此, 只需要 MGCF 在向 CS域用户发起会话请求时, 在会话请求消息中携带 IMS域希望建立的 媒体流信息, 在收到 CS域用户最终的确认消息时, 通过 IMS域的用于媒体 协商的消息反馈协商结果, 确立要建立的媒体流。 *Case 7: The bearer mode of the CS domain and the IMS domain is converted by the IMS terminal; the media stream control signaling in the CS domain is transmitted in an outband manner through the call signaling channel; the media stream control signaling information is passed The call control signaling is carried in the manner of binding; the multimedia call is initiated from the IMS domain to the CS domain, and the interworking process includes the following steps: Step 1: The IMS domain user initiates a multimedia call to the CS domain user, completing the basic call connection such as initiation, ringing, and answering of the call. When the IMS domain initiates a call to the CS domain, it carries the media information to start the media negotiation. This is consistent with the media negotiation process of the IMS domain. Therefore, only the MGCF needs to initiate a session request to the CS domain user in the session request message. When the media stream information that the IMS domain wants to establish is received, when the final confirmation message of the CS domain user is received, the media stream to be established is established through the feedback result of the message negotiation for the media negotiation in the IMS domain.
第二步:在通话过程中, CS域用户或 IMS域用户可能会发起媒体重协商, 由于流程一致, 该过程只需要 MGCF对 CS域和 IMS域进行信令和承载上的 转换即可。  The second step: During the call, the CS domain user or the IMS domain user may initiate media renegotiation. Because the process is consistent, the process only needs the MGCF to perform signaling and bearer conversion on the CS domain and the IMS domain.
本发明实施例还提供了一种 IMS终端, 包括: 保留单元和转换单元。 保留单元, 用于在 CS域与 IMS域媒体流互通的过程中 , 保留 CS域的承 载方式;  An embodiment of the present invention further provides an IMS terminal, including: a reserved unit and a conversion unit. a reserved unit, configured to retain a CS domain loading mode during interworking between the CS domain and the IMS domain media stream;
转换单元, 用于将 IMS域的承载转换为 CS域的承载方式, 以实现承载 方式的互通。 进一步所述转换单元中至少包括下列子单元之一: 分解子单元, 用于将从 CS域发来的 H.223复用流分解为独立的媒体流; 合并子单元, 用于 将发往 CS域的独立媒体流合并为 H.223复用流。  The conversion unit is configured to convert the bearer of the IMS domain into a bearer mode of the CS domain, so as to implement interworking of the bearer mode. Further, the converting unit includes at least one of the following subunits: a decomposing subunit, configured to decompose the H.223 multiplexed stream sent from the CS domain into an independent media stream; and the merging subunit, for sending to the CS The independent media streams of the domain are merged into H.223 multiplexed streams.
本发明实施例还提供了一种 IM-MGW, 包括: 保留单元和转换单元。 保留单元, 用于在 CS域与 IMS域媒体流互通的过程中 , 保留 CS域的承 载方式;  An embodiment of the present invention further provides an IM-MGW, including: a reserved unit and a conversion unit. a reserved unit, configured to retain a CS domain loading mode during interworking between the CS domain and the IMS domain media stream;
转换单元, 用于将 IMS域的承载转换为 CS域的承载方式, 以实现承载 方式的互通。 进一步所述转换单元中至少包括下列子单元之一: 分解子单元, 用于将从 CS域流向 IMS域的 H.223复用流分解为独立的媒体流, 并将独立 的媒体流向 IMS终端传送; 合并子单元, 用于将从 IMS域流向 CS域的独立 媒体流合并为 H.223复用流, 并将 H.223复用流向 CS终端传送。  The conversion unit is configured to convert the bearer of the IMS domain into a bearer mode of the CS domain, so as to implement interworking of the bearer mode. Further, the converting unit includes at least one of the following subunits: a decomposing subunit, configured to decompose the H.223 multiplexed stream flowing from the CS domain to the IMS domain into an independent media stream, and transmit the independent media stream to the IMS terminal. The merging sub-unit is configured to merge the independent media streams flowing from the IMS domain to the CS domain into H.223 multiplexed streams, and transmit the H.223 multiplexed streams to the CS terminal.
以下通过四个实例具体描述。  The following is specifically described by four examples.
V实施例一: 对应上述情况一, 并且 CS域用户向 IMS域用户发起多媒 体呼叫, 参见图 13所示, 包括下列具体步厥: 1到 17、 CS用户向 IMS用户发起呼叫的处理, 该过程完成呼叫的发起、 振铃、 应答以及在用户间建立一条业务数据通道。 V Embodiment 1: Corresponding to the above case 1, and the CS domain user initiates a multimedia call to the IMS domain user, as shown in FIG. 13, the following specific steps are included: 1 to 17, the process of the CS user initiating a call to the IMS user, the process completing the initiation, ringing, answering of the call and establishing a service data channel between the users.
18、 按照 H.245协议建立媒体流通道过程。  18. Establish a media stream channel process in accordance with the H.245 protocol.
呼叫结束时完成拆线的处理。  The process of disconnecting the line is completed at the end of the call.
T实施例二: 对应上述情况一, 并且 IMS域用户向 CS域用户发起多媒 体呼叫, 参见图 14所示, 包括下列具体步驟:  T Embodiment 2: Corresponding to the above case 1, and the IMS domain user initiates a multimedia call to the CS domain user, as shown in FIG. 14, which includes the following specific steps:
1到 17、 IMS用户向 CS用户发起呼叫的处理, 该过程完成呼叫的发起、 振铃、 应答以及在用户间建立一条业务数据通道。  1 to 17, the process of initiating a call by the IMS user to the CS user, the process completing the initiation, ringing, answering of the call and establishing a service data channel between the users.
18、 按照 H.245协议建立媒体流通道过程。  18. Establish a media stream channel process in accordance with the H.245 protocol.
呼叫结束时完成拆线的处理。  The process of disconnecting the line is completed at the end of the call.
▼实施例三: 对应上述情况二, 并且 CS域用户向 IMS域用户发起多媒 体呼叫, 参见图 15所示, 包括下列具体步骤:  ▼ Embodiment 3: Corresponding to the above case 2, and the CS domain user initiates a multimedia call to the IMS domain user, as shown in FIG. 15, the following specific steps are included:
第一步( 1到 4 ), CS域用户向 IMS域用户发起多媒体呼叫, 完成呼叫的 发起、 振铃、 应答等基本呼叫接续。 IMS域在媒体协商时暂不建立媒体流。  In the first step (1 to 4), the CS domain user initiates a multimedia call to the IMS domain user, completing the basic call connection such as originating, ringing, and answering of the call. The IMS domain does not establish a media stream during media negotiation.
第二步 ( 5到 7 )、 CS域向 IMS域发起打开(或关闭)媒体流通道, IMS 域通过重协商建立 (或关闭)相应媒体流。  In the second step (5 to 7), the CS domain initiates opening (or closing) the media stream channel to the IMS domain, and the IMS domain establishes (or closes) the corresponding media stream through renegotiation.
第三步( 8到 11 )、 IMS域通过重协商向 CS域建立(关闭)媒体流, CS 域发起相应打开(或关闭)媒体流。  In the third step (8 to 11), the IMS domain establishes (closes) the media stream to the CS domain through renegotiation, and the CS domain initiates corresponding opening (or closing) of the media stream.
第四步(12 )、 呼叫结束时拆线。  The fourth step (12), the line is disconnected at the end of the call.
Y实施例四: 对应上述情况三, 并且 IMS域用户向 CS域用户发起多媒 体呼叫, 参见图 16所示, 包括下列具体步骤:  Y Embodiment 4: Corresponding to the above case 3, and the IMS domain user initiates a multimedia call to the CS domain user, as shown in FIG. 16, which includes the following specific steps:
第一步 (1 到 4 )、 呼叫 (会话)建立阶段, 完成呼叫的发起、 振铃、 应 答等基本呼叫接续。 MGCF预先假设出一种与 CS域进行媒体协商的结果,在 应答前回复 IMS用户。  The first step (1 to 4), the call (session) establishment phase, the completion of the call initiation, ringing, answering, etc. basic call connection. The MGCF presupposes a result of media negotiation with the CS domain and replies to the IMS user before responding.
第二步( 5到 7 )、按照第一步的预设的媒体协商结果建立到 CS域的媒体 流通道。  The second step (5 to 7) establishes a media stream channel to the CS domain according to the preset media negotiation result in the first step.
第三步( 8到 10 )、 CS域向 IMS域发起打开(或关闭)媒体流通道, IMS 域通过重协商建立(或关闭)相应媒体流。 (该过程在上文的信令互通一节有 评细说明。) The third step (8 to 10), the CS domain initiates opening (or closing) the media stream channel to the IMS domain, IMS The domain establishes (or closes) the corresponding media stream through renegotiation. (This process is described in detail in the Signaling Interworking section above.)
第四步( 11到 14 ), IMS域通过重协商向 CS域建立(关闭)媒体流, CS 域发起相应打开(或关闭)媒体流。  In the fourth step (11 to 14), the IMS domain establishes (closes) the media stream to the CS domain through renegotiation, and the CS domain initiates corresponding opening (or closing) of the media stream.
第五步(15 )、 呼叫结束时拆线。  The fifth step (15), the line is disconnected at the end of the call.
综上所述, 基于 WCDMAR4 (但不限于 WCDMA )的软交换技术已经成 熟并已大量应用, 目前已经有大量用户通过 WCDMA R4 CS域提供的多媒体 呼叫业务进行可视电话业务。 IMS作为一种 WCDMA中一种新的构架, 代表 着未来的一种发展方向, 其同样支持多媒体呼叫。 由于 IMS尚处于发展完善 的过程之中, 可以预见, 在比较长的一段时间内, 基于 WCDMAR4的软交换 技术与 IMS将会共存。  In summary, the softswitch technology based on WCDMAR4 (but not limited to WCDMA) has been matured and has been widely applied. At present, a large number of users have made video call services through the multimedia call service provided by the WCDMA R4 CS domain. As a new architecture in WCDMA, IMS represents a future development direction, which also supports multimedia calls. Since IMS is still in the process of development and perfection, it is foreseeable that WCDMAR4-based softswitch technology and IMS will coexist for a relatively long period of time.
本发明实施例从承载方式和媒体流这两个层面对 CS域与 IMS域的多媒 体呼叫进行互通。  The embodiment of the present invention interworks the multimedia call between the CS domain and the IMS domain from the two layers of the bearer mode and the media stream.
本发明实施例的方法中, 首先保留 CS域的承载方式, 并将 IMS域的承 载转换为 CS域的承载方式, 以实现承载方式的互通; 进一步所述的承载转换 可由 IMS终端完成, 或者由 IM-MGW或 MGCF完成。 其次, 根据 CS域媒 体流控制信令的传输方式, 相应完成 CS域与 IMS域媒体流的互通; 进一步 所述的 CS 域媒体流控制信令的传输方式是通过业务数据通道以带内的方式 进行传输, 或者是通过呼叫信令通道以带外方式进行传输。  In the method of the embodiment of the present invention, the bearer mode of the CS domain is first reserved, and the bearer of the IMS domain is converted into the bearer mode of the CS domain to implement interworking of the bearer mode; further, the bearer conversion may be completed by the IMS terminal, or by IM-MGW or MGCF is completed. Secondly, according to the transmission mode of the CS domain media stream control signaling, the interworking between the CS domain and the IMS domain media stream is completed correspondingly; further, the CS domain media stream control signaling transmission mode is in the inband mode through the service data channel. The transmission is carried out or in an out-of-band manner via the call signalling channel.
本发明实施例的 IMS终端中, 通过保留单元在 CS域与 IMS域媒体流互 通的过程中, 保留 CS域的承载方式, 并通过转换单元将 IMS域的承载转换 为 CS域的承载方式, 以实现 ? 载方式的互通。 ,  In the IMS terminal of the embodiment of the present invention, the UE maintains the bearer mode of the CS domain in the process of interworking between the CS domain and the IMS domain media stream, and converts the bearer of the IMS domain into the bearer mode of the CS domain by using the converting unit, Realize the interoperability of the load mode. ,
本发明实施例的 IP多媒体媒体网关功能实体中, 通过保留单元在 CS域 与 IMS域媒体流互通的过程中, 保留 CS域的承载方式, 并通过转换单元将 IMS域的承载转换为 CS域的承载方式, 以实现承载方式的互通。  In the IP multimedia media gateway function entity of the embodiment of the present invention, the UE maintains the bearer mode of the CS domain in the process of interworking between the CS domain and the IMS domain media stream, and converts the bearer of the IMS domain into the CS domain by using the converting unit. The bearer mode is used to implement interworking of bearer modes.
本发明实施例使得 CS域和 IMS域构架下的用户之间可进行多媒体呼叫, 这提高了运营商的设备可用度, 有利于运营商充分挖掘现有设备的潜力, 为 两种构架下的用户进行多媒体呼叫提供了手段。 发明的精神和范围。 这样, 倘若本发明的这些修改和变型属于本发明权利要 求及其等同技术的范围之内, 则本发明也意图包含这些改动和变型在内。 The embodiments of the present invention enable multimedia calls between users in the CS domain and the IMS domain architecture, which improves the availability of the equipment of the operator, and facilitates the operator to fully exploit the potential of the existing device. Users in both architectures provide the means to make multimedia calls. The spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and the modifications of the invention

Claims

权 利 要 求 Rights request
1、 一种 CS域与 IMS域进行多媒体呼叫互通的实现方法, 其特征在于, 包括下列步骤: A method for implementing multimedia call interworking between a CS domain and an IMS domain, characterized in that the method comprises the following steps:
保留 CS域的承载方式, 并将 IMS域的承载转换为 CS域的承载方式, 以 实现^载方式的互通; 以及  The bearer mode of the CS domain is reserved, and the bearer of the IMS domain is converted into the bearer mode of the CS domain to implement interworking;
根据 CS域媒体流控制信令的传输方式,相应完成 CS域与 IMS域媒体流 的互通。  According to the transmission mode of the CS domain media stream control signaling, the interworking between the CS domain and the IMS domain media stream is completed.
2、如权利要求 1所述的方法,其特征在于,由 IMS终端转换 CS域和 IMS 域的承载方式, 以实现承载方式的互通。  The method according to claim 1, wherein the bearer mode of the CS domain and the IMS domain is switched by the IMS terminal to implement interworking of the bearer mode.
3、 如权利要求 2所述的方法, 其特征在于, 所述 IMS终端转换 CS域和 IMS域的承载方式包括:  The method according to claim 2, wherein the IMS terminal converts the bearer mode of the CS domain and the IMS domain by:
IMS终端将从 CS域发来的 H.223复用流分解为独立的媒体流; 以及 IMS终端将发往 CS域的独立媒体流合并为 H.223复用流。  The IMS terminal decomposes the H.223 multiplexed stream sent from the CS domain into independent media streams; and the IMS terminal merges the independent media streams sent to the CS domain into H.223 multiplexed streams.
4、 如权利要求 3所述的方法, 其特征在于, IMS域网络侧模拟 CS域的 载方式, 以实现承载方式的互通。  4. The method according to claim 3, wherein the IMS domain network side simulates a CS domain loading mode to implement interworking of bearer modes.
5、 如权利要求 4所述的方法, 其特征在于, 通过为每个多媒体呼叫分配 一条承载业务通道, 并以 H.223复用方式透传媒体流, 来模拟 CS域的承载方 式。  The method according to claim 4, wherein the bearer mode of the CS domain is simulated by allocating a bearer service channel for each multimedia call and transparently transmitting the media stream in H.223 multiplexing mode.
6、 如权利要求 1所述的方法, 其特征在于, 转换 CS域和 IMS域的承载 方式包括:  The method according to claim 1, wherein the carrying manner of converting the CS domain and the IMS domain comprises:
将从 CS域流向 IMS域的 H.223复用流分解为独立的媒体流, 并将独立 的媒体流向 IMS终端传送; 以及  Decomposing the H.223 multiplexed stream flowing from the CS domain to the IMS domain into independent media streams, and transmitting the independent media streams to the IMS terminal;
将从 IMS域流向 CS域的独立媒体流合并为 H.223复用流, 并将 H.223 复用流向 CS终端传送。  The independent media streams flowing from the IMS domain to the CS domain are merged into an H.223 multiplexed stream, and the H.223 multiplexed stream is transmitted to the CS terminal.
7、 如权利要求 2至 5任一项所述的方法, 其特征在于, 在 CS域中所述 媒体流控制信令通过业务数据通道以带内的方式进行传输。 The method according to any one of claims 2 to 5, wherein the media stream control signaling is transmitted in an in-band manner through a service data channel in a CS domain.
8、 如权利要求 7所述的方法, 其特征在于, 从 CS域向 IMS域发起多媒 体呼叫, 或从 IMS域向 CS域发起多媒体呼叫, 包括下列子步骤: 8. The method of claim 7, wherein initiating a multimedia call from the CS domain to the IMS domain or initiating a multimedia call from the IMS domain to the CS domain comprises the following sub-steps:
A1、 在 CS域与 IMS域用户间建立透明的承载业务通道;  A1. Establish a transparent bearer service channel between the CS domain and the IMS domain user.
Bl、 通讯各方在所述承载业务通道内, 按照 H.245方式建立和关闭媒体 流, 以完成媒体;^的互通;  Bl. The communication parties establish and close the media stream according to the H.245 mode in the bearer service channel to complete the media;
Cl、 呼叫结束时释放^载资源, 完成拆线处理。  Cl, release the resource when the call ends, and complete the disconnection process.
9、 如权利要求 6所述的方法, 其特征在于, 在 CS域中所述媒体流控制 信令通过业务数据通道以带内的方式进行传输。  9. The method of claim 6, wherein the media flow control signaling is transmitted in an in-band manner through the service data channel in the CS domain.
10、 如权利要求 9所述的方法, 其特征在于, 从 CS域向 IMS域发起多 媒体呼叫, 包括下列子步骤:  10. The method of claim 9, wherein initiating a multimedia call from the CS domain to the IMS domain comprises the following sub-steps:
A2、 完成呼叫接续;  A2, complete the call connection;
B2、 建立 IMS域侧媒体流通道, 并相应建立 CS域侧媒体流通道, 以及 将二者相连, 以完成媒体流的互通;  B2, establishing an IMS domain side media stream channel, and correspondingly establishing a CS domain side media stream channel, and connecting the two to complete the media stream interworking;
C2、 通话过程中, 由 CS域终端向 IMS域终端发起打开或关闭多媒体通 道的操作, MGCF通过重协商控制 IMS域建立或拆除相应媒体流;  C2. During the call, the CS domain terminal initiates an operation of opening or closing the multimedia channel to the IMS domain terminal, and the MGCF controls the IMS domain to establish or tear down the corresponding media stream through renegotiation;
或者, 由 IMS域终端向 CS域终端发起打开或关闭多媒体通道的操作, MGCF通过重协商控制 CS域建立或拆除相应媒体流;  Or, the IMS domain terminal initiates an operation of opening or closing the multimedia channel to the CS domain terminal, and the MGCF establishes or tears down the corresponding media stream by using the renegotiation control CS domain;
D2、 呼叫结束时释放承载资源, 完成拆线处理。  D2. Release the bearer resources when the call ends, and complete the disconnection process.
11、 如权利要求 9所述的方法, 其特征在于, 从 IMS域向 CS域发起多 媒体呼叫, 包括下列子步骤:  11. The method of claim 9, wherein initiating a multimedia call from the IMS domain to the CS domain comprises the following sub-steps:
A3、 完成呼叫接续, 并且 MGCF向 IMS终端回复预设的媒体协商结果, 以建立 IMS域侧的媒体流通道;  A3, completing the call connection, and the MGCF returns a preset media negotiation result to the IMS terminal to establish a media stream channel on the IMS domain side;
B3、 MGCF按照预设的协商结果建立 CS域侧的媒体流通道,以及将 IMS 域侧的媒体流通道和 CS域侧的媒体流通道相连, 以完成媒体流的互通;  B3. The MGCF establishes a media stream channel on the CS domain side according to the preset negotiation result, and connects the media stream channel on the IMS domain side with the media stream channel on the CS domain side to complete the interworking of the media stream;
C3、 通话过程中, 由 CS域终端向 IMS域终端发起打开或关闭多媒体通 道的操作, MGCF通过重协商控制 IMS域建立或拆除相应媒体流;  C3. During the call, the CS domain terminal initiates an operation of opening or closing the multimedia channel to the IMS domain terminal, and the MGCF controls or establishes the corresponding media stream by using the renegotiation control IMS domain;
或者, 由 IMS域终端向 CS域终端发起打开或关闭多媒体通道的操作, MGCF通过重协商控制 CS域建立或拆除相应媒体流; Or, the IMS domain terminal initiates an operation of opening or closing the multimedia channel to the CS domain terminal, The MGCF establishes or tears down the corresponding media stream by re-negotiating the CS domain;
D3、 呼叫结束时释放^载资源, 完成拆线处理。  D3. Release the resource when the call ends, and complete the disconnection process.
12、 如权利要求 11所述的方法, 其特征在于, 步骤 A3中所述预设的媒 体协商结果包括:  The method according to claim 11, wherein the preset media negotiation result in step A3 comprises:
结果一: MGCF接受 IMS用户欲建立的从 IMS域到 CS域的媒体流通道, 并拒绝 IMS用户欲建立的从 CS域到 IMS域的媒体流通道;  Result 1: The MGCF accepts the media stream channel from the IMS domain to the CS domain that the IMS user wants to establish, and rejects the media stream channel from the CS domain to the IMS domain that the IMS user wants to establish;
或者, 结果二: MGCF拒绝 IMS用户欲建立的所有媒体流通道; 或者, 结果三: MGCF接受 IMS用户欲建立的所有媒体流通道。  Or, Result 2: The MGCF rejects all media stream channels that the IMS user wants to establish; or, Result 3: The MGCF accepts all media stream channels that the IMS user wants to establish.
13、 如权利要求 11所述的方法, 其特征在于, 在 CS终端应答后, IMS 终端与 CS终端之间进行媒体协商,并根据协商结果修正已经建立的媒体流通 道。  The method according to claim 11, wherein after the CS terminal answers, media negotiation is performed between the IMS terminal and the CS terminal, and the established media channel is corrected according to the negotiation result.
14、 如权利要求 2至 5任一项所述的方法, 其特征在于, 在 CS域中所述 媒体流控制信令通过呼叫信令通道以带外方式进行传输。  The method according to any one of claims 2 to 5, wherein the media stream control signaling is transmitted in an out-of-band manner through a call signaling channel in a CS domain.
15、 如权利要求 14所述的方法, 其特征在于, 所述媒体流控制信令信息 以 H.245的形式表达。  The method according to claim 14, wherein the media flow control signaling information is expressed in the form of H.245.
16、 如权利要求 15所述的方法, 其特征在于, 从 CS域向 IMS域发起多 媒体呼叫, 包括下列子步骤:  16. The method of claim 15, wherein initiating a multimedia call from the CS domain to the IMS domain comprises the following sub-steps:
A4、完成呼叫接续, 并且 MGCF向 CS域终端回复预设的媒体协商结杲, 以建立 CS域侧的媒体流通道;  A4, completing the call connection, and the MGCF returns a preset media negotiation result to the CS domain terminal to establish a media stream channel on the CS domain side;
B4、 IMS域用户应答后, MGCF根据 A4中媒体流的建立情况补建 MGCF 与 IMS终端的媒体流通道, 并将 IMS终端的媒体流通道和 CS终端的媒体流 通道相连, 以完成媒体流的互通;  B4. After the IMS domain user responds, the MGCF supplements the media stream channel of the MGCF and the IMS terminal according to the establishment of the media stream in the A4, and connects the media stream channel of the IMS terminal with the media stream channel of the CS terminal to complete the media stream. Interworking;
C4、 通话过程中, 由 CS域终端向 IMS域终端发起打开或关闭多媒体通 道的操作, MGCF通过重协商控制 IMS域建立或拆除相应媒体流;  C4. During the call, the CS domain terminal initiates an operation of opening or closing the multimedia channel to the IMS domain terminal, and the MGCF controls the IMS domain to establish or tear down the corresponding media stream through renegotiation;
或者, 由 IMS域终端向 CS域终端发起打开或关闭多媒体通道的操作, MGCF通过重协商控制 CS域建立或拆除相应媒体流;  Or, the IMS domain terminal initiates an operation of opening or closing the multimedia channel to the CS domain terminal, and the MGCF establishes or tears down the corresponding media stream by using the renegotiation control CS domain;
D4、 呼叫结束时释放承载资源, 完成拆线处理。 D4. Release the bearer resources when the call ends, and complete the disconnection process.
17、 如权利要求 16所述的方法, 其特征在于, 所述步骤 A4中还包括: CS域用户在呼叫过程中发起建立 CS终端与 IMS终端的媒体流;并在应答前, MGCF选择接受或拒绝 CS域用户发起建立的媒体流, 以及 MGCF根据预设 的方式立即或暂緩建立从 MGCF到 IMS终端的媒体流。 The method of claim 16, wherein the step A4 further comprises: the CS domain user initiates establishing a media stream of the CS terminal and the IMS terminal during the call; and before answering, the MGCF selects to accept or The media stream initiated by the CS domain user is rejected, and the MGCF immediately or temporarily suspends the media stream from the MGCF to the IMS terminal according to a preset manner.
18、 如权利要求 15所述的方法, 其特征在于, 从 IMS域向 CS域发起多 媒体呼叫, 包括下列子步骤:  18. The method of claim 15, wherein initiating a multimedia call from the IMS domain to the CS domain comprises the following sub-steps:
A5、 完成呼叫接续, 并且 MGCF在收到多媒体呼叫请求后, 发起建立 CS域侧的媒体流通道, 并根据建立的结果向 IMS域终端进行回复, 以相应建 立 IMS域侧的媒体流通道;  A5, completing the call connection, and after receiving the multimedia call request, the MGCF initiates the establishment of the media stream channel on the CS domain side, and responds to the IMS domain terminal according to the established result, so as to establish a media stream channel on the IMS domain side;
B5、 MGCF将 IMS域侧的媒体流通道和 CS域侧的媒体流通道相连, 以 完成媒体流的互通;  B5. The MGCF connects the media stream channel on the IMS domain side with the media stream channel on the CS domain side to complete the interworking of the media streams.
C5、 通话过程中, 由 CS域终端向 IMS域终端发起打开或关闭多媒体通 道的操作, MGCF通过重协商控制 IMS域建立或拆除相应媒体流;  C5. During the call, the CS domain terminal initiates an operation of opening or closing the multimedia channel to the IMS domain terminal, and the MGCF controls the IMS domain to establish or tear down the corresponding media stream through renegotiation;
或者, 由 IMS域终端向 CS域终端发起打开或关闭多媒体通道的操作, MGCF通过重协商控制 CS域建立或拆除相应媒体流;  Or, the IMS domain terminal initiates an operation of opening or closing the multimedia channel to the CS domain terminal, and the MGCF establishes or tears down the corresponding media stream by using the renegotiation control CS domain;
D5、 呼叫结束时释放承载资源, 完成拆线处理。  D5. Release the bearer resources when the call ends, and complete the disconnection process.
19、 如权利要求 14所述的方法, 其特征在于, 所述媒体流控制信令信息 通过与呼叫控制信令捆绑的方式传递。  The method according to claim 14, wherein the media flow control signaling information is delivered by being bundled with call control signaling.
20、 如权利要求 19所述的方法, 其特征在于, 从 CS域向 IMS域发起多 媒体呼叫, 或者从 IMS域向 CS域发起多媒体呼叫, 包括下列子步骤:  20. The method of claim 19, wherein initiating a multimedia call from the CS domain to the IMS domain or initiating a multimedia call from the IMS domain to the CS domain comprises the following sub-steps:
A6、 完成呼叫接续, 并在呼叫接续过程中完成媒体协商, 以建立 CS域 侧及 IMS域侧的媒体流通道;  A6. Complete the call connection, and complete the media negotiation in the call connection process to establish a media stream channel on the CS domain side and the IMS domain side;
B6、 MGCF将 IMS域侧的媒体流通道和 CS域侧的媒体流通道相连, 以 完成媒体流的互通;  B6. The MGCF connects the media stream channel on the IMS domain side with the media stream channel on the CS domain side to complete interworking of the media stream.
C6、通话过程中, CS域用户或 IMS域用户发起媒体重协商时, 由 MGCF 对 CS域和 IMS域进行信令和承载上的转换。  C6. During the call, when the CS domain user or the IMS domain user initiates media renegotiation, the MGCF performs signaling and bearer conversion on the CS domain and the IMS domain.
21、 一种 IMS终端, 其特征在于, 包括: 保留单元, 用于在 CS域与 IMS域媒体流互通的过程中, 保留 CS域的承 载方式; An IMS terminal, comprising: a reservation unit, configured to retain a bearer mode of the CS domain in the process of interworking between the CS domain and the IMS domain media stream;
转换单元, 用于将 IMS域的承载转换为 CS域的承载方式, 以实现承载 方式的互通。  The conversion unit is configured to convert the bearer of the IMS domain into a bearer mode of the CS domain, so as to implement interworking of the bearer mode.
22、 如权利要求 21所述的终端, 其特征在于, 所述转换单元至少包括下 列子单元之一:  The terminal according to claim 21, wherein the conversion unit includes at least one of the following subunits:
分解子单元, 用于将从 CS域发来的 H.223复用流分解为独立的媒体流; 合并子单元, 用于将发往 CS域的独立媒体流合并为 H.223复用流。 The decomposing subunit is configured to decompose the H.223 multiplexed stream sent from the CS domain into an independent media stream; and the merging subunit is configured to merge the independent media streams sent to the CS domain into the H.223 multiplexed stream.
23、 一种 IP多媒体媒体网关功能实体, 其特征在于, 包括: 23. An IP multimedia media gateway functional entity, comprising:
保留单元, 用于在 CS域与 IMS域媒体流互通的过程中, 保留 CS域的承 载方式;  a reserved unit, configured to retain a CS domain loading mode during interworking between the CS domain and the IMS domain media stream;
转换单元, 用于将 IMS域的承载转换为 CS域的承载方式, 以实现承载 方式的互通。  The conversion unit is configured to convert the bearer of the IMS domain into a bearer mode of the CS domain, so as to implement interworking of the bearer mode.
24、 如权利要求 23所述的实体, 其特征在于, 所述转换单元至少包括下 列子单元之一:  24. The entity of claim 23, wherein the converting unit comprises at least one of the following subunits:
分解子单元, 用于将从 CS域流向 IMS域的 H.223复用流分解为独立的 媒体流, 并将独立的媒体流向 IMS终端传送;  Decomposing sub-units for decomposing the H.223 multiplexed stream flowing from the CS domain to the IMS domain into independent media streams, and transmitting the independent media streams to the IMS terminal;
合并子单元, 用于将从 IMS域流向 CS域的独立媒体流合并为 H.223复 用流, 并将 H.223复用流向 CS终端传送。  The merging sub-unit is configured to merge the independent media streams flowing from the IMS domain to the CS domain into an H.223 multiplexed stream, and transmit the H.223 multiplexed stream to the CS terminal.
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