WO2007016874A1 - Mobile exchange center embedded with video gateway andmethod for realizing media intercommunication - Google Patents

Mobile exchange center embedded with video gateway andmethod for realizing media intercommunication Download PDF

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Publication number
WO2007016874A1
WO2007016874A1 PCT/CN2006/002030 CN2006002030W WO2007016874A1 WO 2007016874 A1 WO2007016874 A1 WO 2007016874A1 CN 2006002030 W CN2006002030 W CN 2006002030W WO 2007016874 A1 WO2007016874 A1 WO 2007016874A1
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WO
WIPO (PCT)
Prior art keywords
video
endpoint
multimedia
audio
stream
Prior art date
Application number
PCT/CN2006/002030
Other languages
French (fr)
Chinese (zh)
Inventor
Xinping Yin
Hao Zhang
Zhijun Liao
Ning Zhu
Fang Yin
Original Assignee
Huawei Technologies Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2007016874A1 publication Critical patent/WO2007016874A1/en

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    • H04J13/12—Generation of orthogonal codes
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Definitions

  • the present invention relates to a multimedia interworking technology, and in particular to a mobile switching center (MSC) with a built-in video gateway (VIG), and uses the mobile switching center to implement multimedia interworking between a third generation (3G) network and a fixed communication network.
  • MSC mobile switching center
  • VIP built-in video gateway
  • the multimedia service of the fixed communication network is mainly carried by the Internet Protocol (IP), and the network protocols used include: H.323 protocol, Session Initiation Protocol (SIP), Real Time Streaming Protocol (RTSP), where the application of the H.323 protocol The most extensive.
  • IP Internet Protocol
  • the network protocol adopted by the 3G multimedia service is the H.324M protocol. Therefore, it is usually required to complete the inter-network control signaling and the intercommunication of the multimedia data through the video gateway (VIG, Video Gateway) to implement the integrated multimedia service.
  • FIG. 1 shows a network diagram of a 3G network and a fixed communication network that implements two-network interworking through VIG.
  • the 3G network includes a home location register (HLR), a mobile switching center (MSC) composed of a media gateway controller (MGC) and a media gateway (MG), and a radio network subsystem (RS), where the MGC and the MG Messages passed between them will be carried over IP.
  • HLR home location register
  • MSC mobile switching center
  • MMC media gateway controller
  • MG media gateway
  • RS radio network subsystem
  • a typical fixed communication network will include a Media Resource Server (MRS).
  • MRS Media Resource Server
  • MRS will be used as a multimedia ring back tone platform. use.
  • multimedia communication between the 3G network and the fixed communication network can be achieved by setting up the VIG device in the 3G network and the fixed communication network.
  • the MG in the 3G network communicates with the VIG device through the IP or the time division multiplexing E1 mode, and the VIG device communicates with the network element in the fixed communication network, such as the MRS, by using an IP method.
  • the MSC of the 3G network detects that the call initiated by the 3G mobile terminal is a multimedia service call, and the call needs to be connected to the fixed communication network
  • the MSC connects the call to the VIG device.
  • VIG completes the negotiation with the fixed communication network and the 3G mobile terminal respectively
  • VIG connects the call to the fixed communication network, and completes the conversion of H.324M protocol to H.323 protocol or SIP or RTSP protocol during the call process. Multimedia interworking between 3G networks and fixed communication networks.
  • the present invention provides a mobile switching center with a built-in video gateway, and the mobile switching center completes the interaction between the 3G network and the fixed communication network, thereby realizing the interworking of multimedia services between the two networks.
  • the invention also provides a method for realizing multimedia intercommunication between a 3G network and a fixed communication network, which can avoid loops caused by a call process, save system resources, and improve communication quality of multimedia services.
  • the video gateway unit of the present invention includes: an endpoint T1, an audio endpoint Ra, a video endpoint Rb, and a multiplexing module Mux;
  • the endpoint T1 is used to transfer the H.324M multimedia data stream between the 3G mobile terminal and the multiplexing module;
  • the multiplexing module Mux is used to decompose the H.324M multimedia data stream from the endpoint T1 into H.245 signaling, audio stream and video stream, and send the H.245 signaling to the media gateway controller, the audio stream and the video.
  • the streams are sent to the audio endpoint Ra and the video endpoint Rb, respectively, and are used to multiplex the audio stream from the audio endpoint Ra, the video stream from the video endpoint Rb, and the H.245 signaling from the media gateway controller into H.324M multimedia.
  • Data stream sent to endpoint T1;
  • the audio endpoint Ra is used to transfer audio streams between the multiplexing module Mux and the fixed communication network;
  • the video endpoint Rb is used to pass video streams between the multiplex module Mux and the fixed communication network.
  • the method for implementing multimedia intercommunication according to the present invention includes:
  • the mobile terminal initiates a call, and the originating mobile switching center with the built-in video gateway unit detects that the call needs to be connected to the fixed service network multimedia service network element, and then the built-in video gateway unit allocates a multiplexing module for the call. Audio endpoints and video endpoints;
  • the originating mobile switching center performs capability negotiation with the mobile terminal and the fixed service network multimedia service network element respectively; After the capability negotiation is completed, the mobile terminal and the fixed communication network multimedia service network element perform multimedia communication through the multiplexing module, the audio endpoint and the video endpoint allocated by the video gateway unit built in the originating mobile switching center.
  • the method of the present invention can be implemented by a video gateway function in a mobile switching center.
  • FIG. 1 is a schematic diagram of a network in which a 3G network and a fixed communication network realize mutual communication through a VIG device;
  • FIG. 2 is a schematic structural diagram of an internal VIG unit of the MSC according to the present invention.
  • FIG. 3 is a flowchart of a method for implementing multimedia interworking between a 3G network and an MRS of a fixed communication network according to a preferred embodiment of the present invention
  • FIG. 4 is a flowchart of a method for implementing a multimedia CRBT service according to another preferred embodiment of the present invention. Mode for carrying out the invention
  • the present invention has a VIG unit built in the MSC to implement the function of the VIG, so that the multimedia interworking between the 3G network and the fixed communication network can be directly realized by the MSC.
  • the present invention provides an MSC with a built-in VIG, which includes an MG responsible for media format adaptation conversion between different networks and an MGC that implements all control functions, wherein the MG further includes a 3G network and A VIG unit for multimedia interworking between fixed communication networks.
  • the internal structure of the VIG unit is as shown in FIG. 2, and mainly includes: an endpoint T1, an audio endpoint Ra, a video endpoint Rb, and a multiplexing module Mux.
  • the endpoint T1 is configured to receive the H.324M multimedia data stream from the 3G mobile terminal on one hand, and send the H.324M multimedia data stream to the multiplexing module Mux, and on the other hand to be multiplexed by the multiplexing module Mux.
  • the H.324M multimedia data stream is sent to the 3G mobile terminal through the RNS;
  • the multiplexing module Mux-side is used to decompose the H.324M multimedia data stream from the endpoint T1 into H.245 signaling, audio stream and video stream, and send H.245 signaling to the MGC, the audio stream and the video stream.
  • the audio endpoint Ra is used to transfer the audio stream between the multiplexing module Mux and the fixed communication network
  • the video endpoint Rb is used to transfer the video stream between the multiplexing module Mux and the fixed communication network.
  • the MSC with the built-in VIG unit can demultiplex the H.324M multimedia data stream from the 3G mobile terminal into H.245 signaling, audio stream and video stream, and send the audio stream and the video stream to the fixed communication network.
  • the audio stream and the video stream from the fixed communication network can be multiplexed into the H.324M multimedia data stream and sent to the corresponding 3G mobile terminal, so that the multimedia intercommunication between the 3G network and the fixed communication network can be realized.
  • the MSC built in the MSC of the present invention can implement the VIG function inside the MSC, the network construction and operation and maintenance costs can be reduced compared to the prior art external VIG method, and for example, multimedia In the case of special services such as CRBT, there is no loop in the call process, and thus no additional resources of the MSC are occupied.
  • Figure 3 shows the specific process of multimedia interworking between the 3G mobile terminal and the MRS in the fixed communication network, including the following steps: Al: The 3G mobile terminal (MS) sends a SETUP message to the MGC of the MSC when the call is initiated;
  • the MGC detects that the call is a multimedia call according to the received SETUP message, and analyzes the MRS that should be connected to the fixed communication network, and then passes the Add (Mux, Ra, Rb) message of the standard H.248 protocol ( Adding the endpoint message) to the MG built-in VIG to allocate the multiplexing module Mux. audio endpoint Ra and video endpoint Rb for the multimedia call; wherein, the Mux, Ra and Rb in the parentheses of the Add ( Mux, Ra, Rb ) message are Adding parameters carried by the endpoint message;
  • A3 The MG returns the session description of the multiplexing module Mux and the audio endpoint Ra, the video endpoint Rb allocated by the built-in VIG through the Add-Ack (Mux, Ra, Rb) message of the standard H.248 protocol (adding an endpoint response message). Protocol (SDP) attribute to MGC;
  • the above Add-Ack (Mux, Ra, Rb) message sends the SDP attribute of the multiplex module Mux and the audio endpoint Ra and the video endpoint Rb allocated by the MG to the MGC through the Mux, Ra and Rb parameters in parentheses;
  • the MGC sends an INVITE message to the MRS, and carries the SDP attribute of the audio endpoint Ra and the video endpoint Rb in the message, and informs the MRS of the resource allocated by the call for the call, and performs capability negotiation with the MRS;
  • A5 - A7 After the MRS learns the resource allocation of the call, it responds to the 180 (ringing) and 200 (called responding) messages to the MGC. The MGC then sends a Connect message to the MS, indicating that the MS MRS has responded. This call has been established;
  • A8 - A10 H.324M capability negotiation process between MS start and MGC, through TCS (Terminal Capability Set) message in H.245 signaling, MSD (Master-slave decision) message and OLC (Open Logical Channel) message Ability to negotiate with the MGC;
  • TCS Terminal Capability Set
  • MSD Master-slave decision
  • OLC Open Logical Channel
  • the TCS, MSD, and OLC messages are all H.245 signaling multiplexed in the H.324M multimedia data stream, because in this embodiment The MG has built-in VIG function. Therefore, the multiplex unit Mux allocated by the MG for this call can demultiplex the H.245 signaling message from the H.324M multimedia data stream, and send the signaling message to the MG. MGC, completing the capability negotiation process;
  • the capability negotiation process specifically includes:
  • the MS reports the capability of the mobile terminal's own audio and video support through the TCS message in the H.245 signaling message.
  • the MGC allocates the corresponding resource according to the capability reported by the MS and the capability supported by the MS, and then passes the H.245 signaling message.
  • the TCS message feeds back the audio and video support capabilities of the MGC itself to the mobile terminal;
  • the MS and the MGC negotiate the multiplexing rules of the audio stream and the video stream in the H.324M multimedia data stream and other related parameters, such as the codec mode used, by using the MSD message in the H.245 signaling message.
  • the multiplexing rule is that which logical channels in the H.324M multimedia data stream carry audio streams, and which logical channels carry video streams;
  • the MS and the MGC allocate the corresponding logical channel for the call by using the OLC message in the H.245 signaling message;
  • the multimedia call process is directly performed; and if the negotiation result is inconsistent, the multiplexing module Mux and the audio endpoint Ra in the MG need to be used.
  • a corresponding codec conversion resource TC is inserted between the multiplexing module Mux and the video endpoint Rb to complete the conversion of the streaming media code to implement the adaptation of the multimedia support capability between the MS and the MRS;
  • the MGC may first perform capability negotiation with the MS, and then perform capability negotiation with the MRS according to the negotiation result, without exceeding the scope of the present invention.
  • Al l After the capability negotiation is completed, the MS and the VIRS perform the multimedia call process; before the multimedia call, the MGC has already transmitted the MSD message according to the negotiation process.
  • A12 - A15 When the call ends, the MS requests the MGC to close the logical channel established by the multimedia communication through the CLC (Close Logical Channel) message, and then sends a REL (Release) message to the MGC for the normal call close procedure; MGC and The MRS ends the multimedia call through the BYE (goodbye) message and the response message 200.
  • CLC Click-through Control Channel
  • REL Release
  • the CLC message is also H.245 signaling multiplexed in the H.324M multimedia data stream. Therefore, the multiplexing unit Mux in the MG is also required to decode the H.324M multimedia data stream. Use, to get the CLC message.
  • the MSC Since the method described in this embodiment implements the function of the VIG in the MG, the MSC does not need to interact with the external VIG to implement multimedia interworking with the fixed communication network, thereby greatly saving network construction. And operation and maintenance costs; in addition, since the MG can insert the corresponding TC between the multiplexing module Mux and the audio endpoint Ra and the multiplexing module Mux and the video endpoint Rb, the code conversion is performed, and therefore, the capabilities of the MSC and the MRS and the MS In the case of inconsistent negotiation, multimedia interworking can still be realized without renegotiation process, which greatly simplifies the processing flow of the MGC, and can also avoid the problem of MSC accounting errors occurring in the existing methods.
  • the foregoing embodiment is only a method for intercommunicating multimedia between a 3G mobile terminal and a fixed communication network MRS.
  • the MS can also directly perform multimedia interworking with a fixed service network multimedia service network element that can perform capability negotiation in a fixed communication network.
  • the fixed communication network multimedia service network element may be a multimedia terminal of H.323 or other fixed communication network.
  • the method for implementing the multimedia CRBT service by using the MSC with the built-in VIG function is described in the following.
  • the mobile terminal performs a multimedia interworking process with the multimedia ring back tone platform (MRBT), which is a multimedia service network element of the fixed communication network.
  • MBT multimedia ring back tone platform
  • the MO is the originating end of the call, and may be the 3G mobile terminal that initiates the call;
  • B2 After the O-MSC learns that the called user is also the mobile user, the HLR requests the roaming number of the called user from the HLR;
  • the O-MSC will request the roaming number of the called user from the HLR through the SRI (Send Routing Information) message, and the HLR obtains the roaming number of the called user through the interaction process of the PRN (providing the roaming number) and the PRN response, and then Sending the roaming number of the called user to the 0_MSC through the SRI response;
  • SRI Send Routing Information
  • the multiplex module Mux, the audio endpoint Ra and the video endpoint Rb are allocated for the call.
  • the O-MSC is also divided into two parts, the MGC and the MG, and the method of allocating the multiplexing module Mux, the audio endpoint Ra and the video endpoint Rb is the same as the method described in steps A2 to A3, that is, the O-MSC
  • the MGC requests the MG built-in VIG through the Add ( Mux, Ra, Rb ) message to allocate the multiplexing module Mux, the audio endpoint Ra and the video endpoint Rb for the multimedia call, and the MG returns through the Add-Ack (Mux, Ra, Rb) message.
  • B4 - B6 0-MSC connects the call to the called mobile terminal (MT) according to the roaming number of the called user, and after the MT rings and returns the ACM (address full) message, performs capability negotiation with MO and MRBT respectively;
  • the process of negotiating the 0_MSC with the MO and the MRBT can be implemented in the following two ways:
  • the first type first, the capability negotiation with the MO, and then the capability negotiation with the MRBT;
  • the second type first, the capability negotiation with the MRBT, and then the capability negotiation with the MO; wherein, the method and the step of the O-MSC and the MO performing the capability negotiation
  • the capability negotiation method described in A7 A10 is the same;
  • 0 the method of capability negotiation between the MSC and the MRBT is the same as the capability negotiation method described in steps A4 to A6;
  • the MO reports the mobile terminal support capability through the TCS message in the H.245 signaling message, and the O-MSC also notifies the mobile terminal O through the TCS message in the H.245 signaling message.
  • the audio and video support capabilities of the MSC itself; the MO and the 0_MSC negotiate the multiplexing rules of the audio stream and the video stream in the H.324M multimedia data stream through the MSD message in the H.245 signaling message;
  • MRBT plays multimedia ring tones for MO
  • the MRBT uses the multiplexing module Mux, the audio endpoint Ra, and the video endpoint Rb allocated by the OJVISC for the call to play the multimedia ring back tone for the MO, that is, the multiplexing module Mux of the 0-MSC will input the audio stream and the video stream from the MRBT. It is multiplexed into an H.324M multimedia data stream and sent to the MO. At this point, the MO can see the multimedia video image provided by the multimedia ring back tone service, and hear the multimedia audio sound;
  • B8 - B11 When the MT responds, the O-MSC removes the O-MSC to MRBT connection; In this step, when the MT answers, the MT will send a Connect message to the T-MSC, and the T-MSC sends an ANM (Answer) message. Go to 0 - MSC, notify 0 - the MSC called user has answered, at this time, O-MSC and MRBT remove the O-MSC to MRBT connection through BYE (goodbye) and response message 200;
  • the O-MSC negotiates with the MT. If the result of the capability negotiation is consistent with the result of the OJVISC and MO capability negotiation, the O-MSC is deleted in step B3. Multiplex module Mux, audio endpoint Ra and video endpoint Rb, otherwise, the corresponding TC is inserted between the multiplexing module Mux and the audio endpoint Ra and the multiplexing module Mux and the video endpoint Rb for coding conversion;
  • B13 - B15 The MO makes a call with the MT. After the call ends, the 0-MSC sends a REL (Release) message to the T-MSC, and the T-MSC sends an RLC (Release Complete) message to the 0_MSC to release the chain established by the multimedia call. road.
  • REL Release
  • RLC Release Complete
  • the method described in this embodiment can realize the multimedia intercommunication between the 3G network and the fixed communication network by implementing the function of the VIG inside the MG.
  • the multiplexing module Mux, the audio endpoint Ra, and the video endpoint Rb are not required to perform coding conversion, so that the calling process is not There is a loop of the loop, thereby effectively avoiding waste of resources, and at the same time, the communication quality of the multimedia service between the mobile terminals can be improved because there is no loop.

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Abstract

A mobile exchange center inserted a video gateway includes two portion of a media gateway and a media gateway controller, in which said media gateway is embedded with a video gateway unit for realizing multimedia intercommunication between the 3G and the fixed communication network. A method is used for realizing intercommunication between the 3G and fixed communication network by said mobile exchange center. The multimedia intercommunication is realized by using said mobile exchange center and method without increasing additional cost of building network, running and maintenance. And it can avoid a waste of system source and increase the communication quality of the multimedia service, because of existing circuitous route in the course of a call.

Description

内置视频网关的移动交换中心及实现多媒体互通的方法 技术领域  Mobile switching center with built-in video gateway and method for realizing multimedia intercommunication
本发明涉及多媒体互通技术， 特别涉及到一种内置视频网关（VIG ) 的移动交换中心 （MSC )， 以及利用该移动交换中心在第三代（3G ) 网 络和固定通信网之间实现多媒体互通的方法。 发明背景  The present invention relates to a multimedia interworking technology, and in particular to a mobile switching center (MSC) with a built-in video gateway (VIG), and uses the mobile switching center to implement multimedia interworking between a third generation (3G) network and a fixed communication network. method. Background of the invention
随着 3G网络商用的即将到来，移动多媒体业务作为 3G网络的特色 业务也开始受到人们的广泛关注。 如果将移动网络的移动性、 漫游性等 特点结合到传统固定通信网的多媒体业务中， 以两网多媒体资源为基 础， 发展综合多媒体业务， 无疑会给用户带来更大的便利。  With the upcoming commercialization of 3G networks, mobile multimedia services have begun to receive widespread attention as a feature of 3G networks. If the mobility, roaming and other characteristics of the mobile network are combined into the multimedia services of the traditional fixed communication network, and the development of integrated multimedia services based on the multimedia resources of the two networks will undoubtedly bring greater convenience to users.
但是， 固定通信网的多媒体业务主要由因特网协议（IP )承载， 使 用的网络协议包括： H.323 协议、 会话初始协议 （SIP )、 实时流协议 ( RTSP )o 其中， H.323协议的应用最为广泛。 而 3G多媒体业务采用的 网络协议为 H.324M协议， 因此， 通常需要通过视频网关（VIG, Video Gateway ) 完成两网间控制信令及多媒体数据的互通， 以实现所述综合 多媒体 k务。  However, the multimedia service of the fixed communication network is mainly carried by the Internet Protocol (IP), and the network protocols used include: H.323 protocol, Session Initiation Protocol (SIP), Real Time Streaming Protocol (RTSP), where the application of the H.323 protocol The most extensive. The network protocol adopted by the 3G multimedia service is the H.324M protocol. Therefore, it is usually required to complete the inter-network control signaling and the intercommunication of the multimedia data through the video gateway (VIG, Video Gateway) to implement the integrated multimedia service.
图 1显示了一种 3G网络和固定通信网通过 VIG实现两网互通的网 络示意图。 其中， 3G网络包括归属位置寄存器 （HLR)、 由媒体网关控 制器（MGC )和媒体网关（MG )构成的移动交换中心 （MSC ) 以及无 线网络子系统（R S ), 其中，在 MGC和 MG之间传递的消息将通过 IP 承载。  Figure 1 shows a network diagram of a 3G network and a fixed communication network that implements two-network interworking through VIG. The 3G network includes a home location register (HLR), a mobile switching center (MSC) composed of a media gateway controller (MGC) and a media gateway (MG), and a radio network subsystem (RS), where the MGC and the MG Messages passed between them will be carried over IP.
典型的固定通信网将包含媒体资源服务器 （MRS , Multimedia Resource Server )。在彩铃业务的应用中， MRS将作为多媒体彩铃平台使 用。 A typical fixed communication network will include a Media Resource Server (MRS). In the application of the CRBT service, MRS will be used as a multimedia ring back tone platform. use.
如图 1所示， 通过在 3G网络和固定通信网中设置 VIG设备， 可以 实现 3G网络和固定通信网的多媒体互通。 其中， 3G网络中的 MG通过 IP或时分复用的 E1方式与 VIG设备进行通信， VIG设备与固定通信网 中的网元， 例如 MRS, 通过 IP方式进行通信。  As shown in Figure 1, multimedia communication between the 3G network and the fixed communication network can be achieved by setting up the VIG device in the 3G network and the fixed communication network. The MG in the 3G network communicates with the VIG device through the IP or the time division multiplexing E1 mode, and the VIG device communicates with the network element in the fixed communication network, such as the MRS, by using an IP method.
在图 1所示的网络中， 当 3G网络的 MSC检测到由 3G移动终端发 起的呼叫为多媒体业务呼叫， 且需要将本次呼叫接续到固定通信网时， MSC将本次呼叫接续到 VIG设备， VIG在分别完成与固定通信网及 3G 移动终端的能力协商后， 将呼叫接续到固定通信网， 并在呼叫过程中完 成 H.324M协议到 H.323协议或 SIP或 RTSP协议的转换，实现 3G网络 和固定通信网之间的多媒体互通。  In the network shown in FIG. 1, when the MSC of the 3G network detects that the call initiated by the 3G mobile terminal is a multimedia service call, and the call needs to be connected to the fixed communication network, the MSC connects the call to the VIG device. After VIG completes the negotiation with the fixed communication network and the 3G mobile terminal respectively, VIG connects the call to the fixed communication network, and completes the conversion of H.324M protocol to H.323 protocol or SIP or RTSP protocol during the call process. Multimedia interworking between 3G networks and fixed communication networks.
上述这种方法虽然解决了 3G网络和固定通信网之间多媒体互通的 问题， 可以实现两网综合多媒体业务， 但是由于需要在两个网絡之间设 置 VIG设备， 因而造成投资和运营、 维护成本较高。 发明内容  Although the above method solves the problem of multimedia intercommunication between the 3G network and the fixed communication network, the two-network integrated multimedia service can be realized, but since the VIG device needs to be set between the two networks, the investment, operation, and maintenance costs are relatively low. high. Summary of the invention
为了解决上述技术问题， 本发明提供了一种内置视频网关的移动交 换中心， 由该移动交换中心完成 3G网络和固定通信网的交互， 实现两 网之间多媒体业务互通。  In order to solve the above technical problem, the present invention provides a mobile switching center with a built-in video gateway, and the mobile switching center completes the interaction between the 3G network and the fixed communication network, thereby realizing the interworking of multimedia services between the two networks.
本发明还提供了一种在 3G网络和固定通信网之间实现多媒体互通 的方法， 可以避免呼叫过程中出现的迂回路由， 同时节约系统资源， 提 高多媒体业务的通信质量。  The invention also provides a method for realizing multimedia intercommunication between a 3G network and a fixed communication network, which can avoid loops caused by a call process, save system resources, and improve communication quality of multimedia services.
本发明所述内置视频网关的移动交换中心， 包括： 媒体网关和媒体 网关控制器两部分； 所述媒体网关内置有实现第三代网络和固定通信网 之间多媒体互通视频网关单元， 该视频网关单元将来自 3G移动终端的 Η·324Μ多媒体数据流分解为 H.245信令、 音频流及视频流， 将其中 的 H.245信令发送到媒体网关控制器，将其中的音频流和视频流发送 到固定通信网； 同时用于将来自媒体网关控制器的 H.245信令以及来 自固定通信网的音频流和视频流复用成为 H.324M多媒体数据流发送 到 3G移动终端。 The mobile switching center with the built-in video gateway of the present invention comprises: a media gateway and a media gateway controller; the media gateway has a built-in multimedia interworking video gateway unit between the third generation network and the fixed communication network, and the video gateway The unit will come from the 3G mobile terminal Η· 324 Μ multimedia data stream is decomposed into H.245 signaling, audio stream and video stream, and the H.245 signaling is sent to the media gateway controller, and the audio stream and the video stream are sent to the fixed communication network; At the same time, it is used to multiplex the H.245 signaling from the media gateway controller and the audio stream and the video stream from the fixed communication network into H.324M multimedia data streams and send them to the 3G mobile terminal.
本发明所述视频网关单元包括： 端点 Tl、 音频端点 Ra、 视频端点 Rb以及复用模块 Mux;  The video gateway unit of the present invention includes: an endpoint T1, an audio endpoint Ra, a video endpoint Rb, and a multiplexing module Mux;
其中， 端点 T1用于在 3G移动终端和复用模块之间传递 H.324M 多媒体数据流；  The endpoint T1 is used to transfer the H.324M multimedia data stream between the 3G mobile terminal and the multiplexing module;
复用模块 Mux用于将来自端点 T1的 H.324M多媒体数据流分解 为 H.245信令、 音频流及视频流， 并将 H.245信令发送到媒体网关控 制器， 将音频流和视频流分别发送到音频端点 Ra和视频端点 Rb, 同 时用于将来自音频端点 Ra的音频流、 来自视频端点 Rb的视频流以 及来自媒体网关控制器的 H.245信令复用成为 H.324M 多媒体数据 流， 发送到端点 T1 ;  The multiplexing module Mux is used to decompose the H.324M multimedia data stream from the endpoint T1 into H.245 signaling, audio stream and video stream, and send the H.245 signaling to the media gateway controller, the audio stream and the video. The streams are sent to the audio endpoint Ra and the video endpoint Rb, respectively, and are used to multiplex the audio stream from the audio endpoint Ra, the video stream from the video endpoint Rb, and the H.245 signaling from the media gateway controller into H.324M multimedia. Data stream, sent to endpoint T1;
音频端点 Ra用于在复用模块 Mux和固定通信网之间传递音频 流；  The audio endpoint Ra is used to transfer audio streams between the multiplexing module Mux and the fixed communication network;
视频端点 Rb用于在复用模块 Mux和固定通信网之间传递视频 流。  The video endpoint Rb is used to pass video streams between the multiplex module Mux and the fixed communication network.
本发明所述实现多媒体互通的方法， 包括：  The method for implementing multimedia intercommunication according to the present invention includes:
移动终端发起呼叫， 内置有视频网关单元的始发移动交换中心检测 到需要将本次呼叫接续到固定通信网多媒体业务网元后， 令其内置的视 频网关单元为本次呼叫分配复用模块、 音频端点和视频端点；  The mobile terminal initiates a call, and the originating mobile switching center with the built-in video gateway unit detects that the call needs to be connected to the fixed service network multimedia service network element, and then the built-in video gateway unit allocates a multiplexing module for the call. Audio endpoints and video endpoints;
所述始发移动交换中心分别与移动终端及固定通信网多媒体业务网 元进行能力协商； 能力协商完成后， 移动终端与所述固定通信网多媒体业务网元通过 由始发移动交换中心内置的视频网关单元分配的复用模块、 音频端点和 视频端点进行多媒体通信。 The originating mobile switching center performs capability negotiation with the mobile terminal and the fixed service network multimedia service network element respectively; After the capability negotiation is completed, the mobile terminal and the fixed communication network multimedia service network element perform multimedia communication through the multiplexing module, the audio endpoint and the video endpoint allocated by the video gateway unit built in the originating mobile switching center.
本发明所述的方法通过在移动交换中心内置视频网关功能， 可以在 The method of the present invention can be implemented by a video gateway function in a mobile switching center.
3G 网络和固定通信网之间实现两网多媒体业务的互通； 并且与现有外 置 VIG设备的方法相比， 由于视频网关功能是内置在 MSC中的， 因此， 不需要增加额外的网络建设和运营维护成本。 附图简要说明 The interworking of the two networks of multimedia services is implemented between the 3G network and the fixed communication network; and compared with the existing method of the external VIG device, since the video gateway function is built in the MSC, no additional network construction and no additional network construction is required. Operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS
图 1为 3G网络和固定通信网通过 VIG设备实现两网互通的网络示 意图；  FIG. 1 is a schematic diagram of a network in which a 3G network and a fixed communication network realize mutual communication through a VIG device;
图 2为本发明所述 MSC内部 VIG单元的结构示意图；  2 is a schematic structural diagram of an internal VIG unit of the MSC according to the present invention;
图 3为本发明一个优选实施例所述在 3G网络和固 通信网的 MRS 之间实现多媒体互通方法的流程图；  3 is a flowchart of a method for implementing multimedia interworking between a 3G network and an MRS of a fixed communication network according to a preferred embodiment of the present invention;
图 4为本发明另一个优选实施例所述的多媒体彩铃业务的实现方法 流程图。 实施本发明的方式  FIG. 4 is a flowchart of a method for implementing a multimedia CRBT service according to another preferred embodiment of the present invention. Mode for carrying out the invention
为了解决现有技术存在的问题， 本发明在 MSC 内部内置一个 VIG 单元， 以实现 VIG的功能， 从而可以直接由 MSC实现 3G网絡和固定 通信网之间的多媒体互通。  In order to solve the problems existing in the prior art, the present invention has a VIG unit built in the MSC to implement the function of the VIG, so that the multimedia interworking between the 3G network and the fixed communication network can be directly realized by the MSC.
为此， 本发明提供了一种内置 VIG的 MSC, 该 MSC包括负责不同 网络之间媒体格式适配转换的 MG及实现所有控制功能的 MGC两部分， 其中， MG进一步包括用于实现 3G网络和固定通信网之间多媒体互通 的 VIG单元。 该 VIG单元的内部结构如图 2所示， 主要包括： 端点 Tl、 音频端 点 Ra、 视频端点 Rb以及复用模块 Mux。 To this end, the present invention provides an MSC with a built-in VIG, which includes an MG responsible for media format adaptation conversion between different networks and an MGC that implements all control functions, wherein the MG further includes a 3G network and A VIG unit for multimedia interworking between fixed communication networks. The internal structure of the VIG unit is as shown in FIG. 2, and mainly includes: an endpoint T1, an audio endpoint Ra, a video endpoint Rb, and a multiplexing module Mux.
其中， 端点 T1一方面用于接收来自 3G移动终端的 H.324M多媒体 数据流， 并将该 H.324M多媒体数据流发送到复用模块 Mux, 另一方面 用于将由复用模块 Mux复用合成的 H.324M多媒体数据流通过 RNS发 往 3G移动终端；  The endpoint T1 is configured to receive the H.324M multimedia data stream from the 3G mobile terminal on one hand, and send the H.324M multimedia data stream to the multiplexing module Mux, and on the other hand to be multiplexed by the multiplexing module Mux. The H.324M multimedia data stream is sent to the 3G mobile terminal through the RNS;
复用模块 Mux—方面用于将来自端点 T1的 H.324M多媒体数据流 分解为 H.245信令、 音频流及视频流， 并将 H.245信令发送到 MGC, 将音频流和视频流分别发送到音频端点 Ra和视频端点 Rb, 另一方面用 于将来自音频端点 Ra的音频流、 来自视频端点 Rb的视频流以及来自 MGC的 H.245信令复用成为 H.324M多媒体数据流，并发送到端点 T1; 音频端点 Ra用于在复用模块 Mux和固定通信网之间传递音频流； 视频端点 Rb用于在复用模块 Mux和固定通信网之间传递视频流。 内置有上述 VIG单元的 MSC—方面可以将来自 3G移动终端的 H.324M多媒体数据流解复用为 H.245信令、 音频流及视频流， 并将音 频流和视频流发送到固定通信网， 另一方面还可以将来自固定通信网的 音频流和视频流复用成为 H.324M多媒体数据流， 发送到相应的 3G移 动终端， 因而可以实现 3G网络与固定通信网之间的多媒体互通。  The multiplexing module Mux-side is used to decompose the H.324M multimedia data stream from the endpoint T1 into H.245 signaling, audio stream and video stream, and send H.245 signaling to the MGC, the audio stream and the video stream. Is sent to the audio endpoint Ra and the video endpoint Rb, respectively, and on the other hand is used to multiplex the audio stream from the audio endpoint Ra, the video stream from the video endpoint Rb, and the H.245 signaling from the MGC into the H.324M multimedia data stream. And sent to the endpoint T1; the audio endpoint Ra is used to transfer the audio stream between the multiplexing module Mux and the fixed communication network; the video endpoint Rb is used to transfer the video stream between the multiplexing module Mux and the fixed communication network. The MSC with the built-in VIG unit can demultiplex the H.324M multimedia data stream from the 3G mobile terminal into H.245 signaling, audio stream and video stream, and send the audio stream and the video stream to the fixed communication network. On the other hand, the audio stream and the video stream from the fixed communication network can be multiplexed into the H.324M multimedia data stream and sent to the corresponding 3G mobile terminal, so that the multimedia intercommunication between the 3G network and the fixed communication network can be realized.
并且， 由于本发明所述 MSC内置有 VIG单元，可以在 MSC的内部 实现 VIG功能， 因此， 与现有技术中外置 VIG的方法相比， 可以降低 网络建设及运营和维护成本， 并且对于例如多媒体彩铃等特殊业务来 讲， 其呼叫过程不存在迂回路由， 因而也不会额外占用 MSC的资源。  Moreover, since the MSC built in the MSC of the present invention can implement the VIG function inside the MSC, the network construction and operation and maintenance costs can be reduced compared to the prior art external VIG method, and for example, multimedia In the case of special services such as CRBT, there is no loop in the call process, and thus no additional resources of the MSC are occupied.
下面将通过具体实施例说明利用内置 VIG功能的 MSC实现 3G网 络和 H.323网络多媒体互通的方法。 图 3显示了 3G移动终端与固定通 信网中 MRS进行多媒体互通的具体流程， 包括以下步骤： Al : 3G移动终端（MS )在发起呼叫时， 发送 SETUP (建立）消息 到 MSC的 MGC; A method for implementing multimedia interworking between a 3G network and an H.323 network using an MSC with a built-in VIG function will be described below by way of a specific embodiment. Figure 3 shows the specific process of multimedia interworking between the 3G mobile terminal and the MRS in the fixed communication network, including the following steps: Al: The 3G mobile terminal (MS) sends a SETUP message to the MGC of the MSC when the call is initiated;
A2: MGC根据接收到的 SETUP消息检测出本次呼叫为多媒体呼叫， 并分析出应当将呼叫接续到固定通信网络的 MRS后， 通过标准 H.248 协议的 Add ( Mux, Ra, Rb )消息（增加端点消息）向 MG内置的 VIG 倩求为本次多媒体呼叫分配复用模块 Mux.音频端点 Ra和视频端点 Rb; 其中， Add ( Mux, Ra, Rb ) 消息括号中的 Mux、 Ra和 Rb为所述 增加端点消息所携带的参数；  A2: The MGC detects that the call is a multimedia call according to the received SETUP message, and analyzes the MRS that should be connected to the fixed communication network, and then passes the Add (Mux, Ra, Rb) message of the standard H.248 protocol ( Adding the endpoint message) to the MG built-in VIG to allocate the multiplexing module Mux. audio endpoint Ra and video endpoint Rb for the multimedia call; wherein, the Mux, Ra and Rb in the parentheses of the Add ( Mux, Ra, Rb ) message are Adding parameters carried by the endpoint message;
A3: MG通过标准 H.248协议的 Add-Ack ( Mux, Ra, Rb )消息（增 加端点响应消息）返回由所述内置 VIG所分配复用模块 Mux及音频端 点 Ra、 视频端点 Rb的会话描述协议 ( SDP )属性到 MGC;  A3: The MG returns the session description of the multiplexing module Mux and the audio endpoint Ra, the video endpoint Rb allocated by the built-in VIG through the Add-Ack (Mux, Ra, Rb) message of the standard H.248 protocol (adding an endpoint response message). Protocol (SDP) attribute to MGC;
上述 Add-Ack ( Mux, Ra, Rb ) 消息通过括号中的 Mux、 Ra和 Rb 参数将 MG为本次呼叫分配的复用模块 Mux及音频端点 Ra、 视频端点 Rb的 SDP属性发送到 MGC;  The above Add-Ack (Mux, Ra, Rb) message sends the SDP attribute of the multiplex module Mux and the audio endpoint Ra and the video endpoint Rb allocated by the MG to the MGC through the Mux, Ra and Rb parameters in parentheses;
A4: MGC向 MRS发送 INVITE (邀请 ) 消息， 并在该消息中携带 音频端点 Ra和视频端点 Rb的 SDP属性， 将自身为本次呼叫分配的资 源告知 MRS, 与 MRS进行能力协商；  A4: The MGC sends an INVITE message to the MRS, and carries the SDP attribute of the audio endpoint Ra and the video endpoint Rb in the message, and informs the MRS of the resource allocated by the call for the call, and performs capability negotiation with the MRS;
A5 - A7: MRS获知本次呼叫的资源分配情况后， 响应 180 (振铃） 和 200 (被叫应答）消息到 MGC, MGC接下来发送 Connect (连接）消 息到 MS, 指示 MS MRS已经应答， 本次呼叫已经建立；  A5 - A7: After the MRS learns the resource allocation of the call, it responds to the 180 (ringing) and 200 (called responding) messages to the MGC. The MGC then sends a Connect message to the MS, indicating that the MS MRS has responded. This call has been established;
A8 - A10: MS启动与 MGC之间的 H.324M能力协商处理流程， 通 过 H.245信令中的 TCS (终端能力集）消息， MSD (主从决定）消息以 及 OLC (打开逻辑信道） 消息与 MGC进行能力协商；  A8 - A10: H.324M capability negotiation process between MS start and MGC, through TCS (Terminal Capability Set) message in H.245 signaling, MSD (Master-slave decision) message and OLC (Open Logical Channel) message Ability to negotiate with the MGC;
需要说明的是， 在该步骤中， 所述 TCS、 MSD及 OLC消息均是复 用在所述 H.324M 多媒体数据流中的 H.245 信令， 由于本实施例中的 MG内置了 VIG功能， 因此， MG为本次呼叫所分配的复用单元 Mux 可以从所述 H.324M多媒体数据流中解复用出 H.245信令消息， 并将这 些信令消息发送给 MGC, 完成所述能力协商过程； It should be noted that, in this step, the TCS, MSD, and OLC messages are all H.245 signaling multiplexed in the H.324M multimedia data stream, because in this embodiment The MG has built-in VIG function. Therefore, the multiplex unit Mux allocated by the MG for this call can demultiplex the H.245 signaling message from the H.324M multimedia data stream, and send the signaling message to the MG. MGC, completing the capability negotiation process;
所述能力协商过程具体包括：  The capability negotiation process specifically includes:
首先， MS通过 H.245信令消息中的 TCS消息上报移动终端自身音 频和视频支持的能力， MGC根据 MS上报的能力以及自身支持的能力 分配相应的资源，再通过 H.245信令消息中的 TCS消息向移动终端反馈 该 MGC本身的音频和视频支持能力；  First, the MS reports the capability of the mobile terminal's own audio and video support through the TCS message in the H.245 signaling message. The MGC allocates the corresponding resource according to the capability reported by the MS and the capability supported by the MS, and then passes the H.245 signaling message. The TCS message feeds back the audio and video support capabilities of the MGC itself to the mobile terminal;
然后， MS 和 MGC再通过 H.245 信令消息中的 MSD 消息协商 H.324M 多媒体数据流中音频流和视频流的复用规则及其他相关的参 数， 例如所采用的编解码方式等； 所述复用规则即是 H.324M多媒体数 据流中哪几个逻辑信道承载的是音频流， 哪几个逻辑信道承载的是视频 流；  Then, the MS and the MGC negotiate the multiplexing rules of the audio stream and the video stream in the H.324M multimedia data stream and other related parameters, such as the codec mode used, by using the MSD message in the H.245 signaling message. The multiplexing rule is that which logical channels in the H.324M multimedia data stream carry audio streams, and which logical channels carry video streams;
最后， MS和 MGC通过 H.245信令消息中的 OLC消息， 为本次呼 叫分配相应的逻辑信道；  Finally, the MS and the MGC allocate the corresponding logical channel for the call by using the OLC message in the H.245 signaling message;
在该步骤中，如果本次能力协商的结果和 MGC与 MRS的能力协商 结果一致， 则直接进行多媒体通话过程； 而如果协商结果不一致， 则需 要通过在 MG的复用模块 Mux和音频端点 Ra及复用模块 Mux和视频 端点 Rb之间插入相应的编解码转换资源 TC, 完成流媒体编码的转换， 来实现 MS与 MRS之间多媒体支持能力的适配；  In this step, if the result of the current capability negotiation is consistent with the MGC and MRS capability negotiation result, the multimedia call process is directly performed; and if the negotiation result is inconsistent, the multiplexing module Mux and the audio endpoint Ra in the MG need to be used. A corresponding codec conversion resource TC is inserted between the multiplexing module Mux and the video endpoint Rb to complete the conversion of the streaming media code to implement the adaptation of the multimedia support capability between the MS and the MRS;
在上述 A4 ~ A10所述的能力协商过程中， MGC也可以首先与 MS 进行能力协商， 再根据协商结果与 MRS进行能力协商， 而不会超出本 发明意欲保护的范围，在这种情况下，不会出现协商结果不一致的情况； Al l : 在能力协商完成后， MS与] VIRS进行多媒体通话过程； 在进行多媒体通话前， MGC已经根据协商过程中传递的 MSD消息 获知所述 H.324M多媒体数据流中音频流和视频流的复用规则， 这样， 在多媒体通话过程中， 配置 MG中的复用模块 Mux根据所述复用规则 将来自 MS的 H.324M多媒体数据流分解成音频流和视频流，并通过 MG 中分配的音频端点 Ra和视频端点 Rb发送到 MRS, 或将来自 MRS、 通 过音频端点 Ra及视频端点 Rb接收的音频流和视频流复用成为 H.324M 多媒体数据流， 发送到 MS, 从而实现 MS和 MRS之间的多媒体互通；In the capability negotiation process described in the foregoing A4 to A10, the MGC may first perform capability negotiation with the MS, and then perform capability negotiation with the MRS according to the negotiation result, without exceeding the scope of the present invention. In this case, There is no inconsistency in the negotiation result; Al l : After the capability negotiation is completed, the MS and the VIRS perform the multimedia call process; before the multimedia call, the MGC has already transmitted the MSD message according to the negotiation process. Obtaining the multiplexing rule of the audio stream and the video stream in the H.324M multimedia data stream, so that during the multimedia call, the multiplexing module Mux in the MG is configured to use the H.324M multimedia from the MS according to the multiplexing rule. The data stream is decomposed into an audio stream and a video stream, and transmitted to the MRS through the audio endpoint Ra and the video endpoint Rb allocated in the MG, or the audio stream and the video stream received from the MRS, through the audio endpoint Ra, and the video endpoint Rb are multiplexed into H.324M multimedia data stream is sent to the MS to implement multimedia interworking between the MS and the MRS;
A12 - A15: 当本次通话结束时， MS通过 CLC (关闭逻辑信道）消 息请求 MGC关闭本次多媒体通信建立的逻辑信道， 然后发送 REL (释 放）消息到 MGC进行正常的呼叫关闭流程； MGC和 MRS通过 BYE(再 见） 消息及响应消息 200结束本次多媒体呼叫。 A12 - A15: When the call ends, the MS requests the MGC to close the logical channel established by the multimedia communication through the CLC (Close Logical Channel) message, and then sends a REL (Release) message to the MGC for the normal call close procedure; MGC and The MRS ends the multimedia call through the BYE (goodbye) message and the response message 200.
在上述步骤中， CLC消息也是复用在所述 H.324M多媒体数据流中 的 H.245信令， 因此， 也需要 MG中的复用单元 Mux对所述 H.324M多 媒体数据流进行解复用， 才能得到所述 CLC消息。  In the above steps, the CLC message is also H.245 signaling multiplexed in the H.324M multimedia data stream. Therefore, the multiplexing unit Mux in the MG is also required to decode the H.324M multimedia data stream. Use, to get the CLC message.
由于本实施例所述的方法在 MG的内部实现了 VIG的功能， 因此， MSC不需要与外置的 VIG进行交互就可以实现与固定通信网之间的多 媒体互通， 大大的节约了网络的建设和运营维护成本； 另外， 由于 MG 可以在复用模块 Mux和音频端点 Ra以及复用模块 Mux和视频端点 Rb 之间插入相应的 TC, 进行编码变换， 因此， 在 MSC与 MRS和与 MS 的能力协商不一致的情况下仍能实现多媒体互通， 而不需要重新协商过 程， 大大的简化了 MGC的处理流程， 同时也可以避免现有方法中出现 的 MSC计费错误的问题。  Since the method described in this embodiment implements the function of the VIG in the MG, the MSC does not need to interact with the external VIG to implement multimedia interworking with the fixed communication network, thereby greatly saving network construction. And operation and maintenance costs; in addition, since the MG can insert the corresponding TC between the multiplexing module Mux and the audio endpoint Ra and the multiplexing module Mux and the video endpoint Rb, the code conversion is performed, and therefore, the capabilities of the MSC and the MRS and the MS In the case of inconsistent negotiation, multimedia interworking can still be realized without renegotiation process, which greatly simplifies the processing flow of the MGC, and can also avoid the problem of MSC accounting errors occurring in the existing methods.
上述实施例仅是以 3G移动终端与固定通信网 MRS进行多媒体互通 的方法， 应用上述方法 MS还可以与固定通信网中可以进行能力协商的 固定通信网多媒体业务网元直接进行多媒体互通。 例如， 所述固定通信 网多媒体业务网元可以是 H.323或其他固定通信网络的多媒体终端。 下面再通过具体实施例说明利用内置 VIG功能的 MSC实现多媒体 彩铃业务的方法， 在本实施例中， 移动终端将与作为固定通信网多媒体 业务网元的多媒体彩铃平台 （MRBT )进行多媒体互通过程， 如图 4所 示： The foregoing embodiment is only a method for intercommunicating multimedia between a 3G mobile terminal and a fixed communication network MRS. The MS can also directly perform multimedia interworking with a fixed service network multimedia service network element that can perform capability negotiation in a fixed communication network. For example, the fixed communication network multimedia service network element may be a multimedia terminal of H.323 or other fixed communication network. The method for implementing the multimedia CRBT service by using the MSC with the built-in VIG function is described in the following. In this embodiment, the mobile terminal performs a multimedia interworking process with the multimedia ring back tone platform (MRBT), which is a multimedia service network element of the fixed communication network. As shown in Figure 4:
B1 : 当始发移动终端 （MO )发起多媒体呼叫时， MO向始发 MSC ( 0— MSC )发送 SETUP消息；  B1: When the originating mobile terminal (MO) initiates a multimedia call, the MO sends a SETUP message to the originating MSC (0-MSC);
所述 MO为呼叫的始发端， 可以是发起呼叫的 3G移动终端； B2: O—MSC获知被叫用户也为移动用户后， 向 HLR索取被叫用户 的漫游号码；  The MO is the originating end of the call, and may be the 3G mobile terminal that initiates the call; B2: After the O-MSC learns that the called user is also the mobile user, the HLR requests the roaming number of the called user from the HLR;
在本步骤中， O—MSC将通过 SRI (发送路由信息） 消息向 HLR请 求被叫用户的漫游号码， HLR通过 PRN (提供漫游号码）和 PRN响应 的交互过程得到被叫用户的漫游号码， 再通过 SRI响应将被叫用户的漫 游号码发送到 0_MSC;  In this step, the O-MSC will request the roaming number of the called user from the HLR through the SRI (Send Routing Information) message, and the HLR obtains the roaming number of the called user through the interaction process of the PRN (providing the roaming number) and the PRN response, and then Sending the roaming number of the called user to the 0_MSC through the SRI response;
B3: O—MSC在索取被叫用户漫游号码的过程中获知被叫用户签约 了多媒体彩铃业务后， 为本次呼叫分配复用模块 Mux, 音频端点 Ra和 视频端点 Rb;  B3: After the O-MSC learns that the called user has subscribed to the multimedia CRBT service in the process of requesting the roaming number of the called user, the multiplex module Mux, the audio endpoint Ra and the video endpoint Rb are allocated for the call.
在该步骤中， O—MSC也分成 MGC和 MG两部分，且所述分配复用 模块 Mux,音频端点 Ra和视频端点 Rb的方法与步骤 A2 ~ A3所述的方 法相同， 即 O—MSC的 MGC通过 Add ( Mux, Ra, Rb ) 消息向 MG内 置的 VIG请求为本次多媒体呼叫分配复用模块 Mux, 音频端点 Ra和视 频端点 Rb, MG通过 Add-Ack ( Mux, Ra, Rb ) 消息返回由内置 VIG 所分配复用模块 Mux及音频端点 Ra、 视频端点 Rb的 SDP属性；  In this step, the O-MSC is also divided into two parts, the MGC and the MG, and the method of allocating the multiplexing module Mux, the audio endpoint Ra and the video endpoint Rb is the same as the method described in steps A2 to A3, that is, the O-MSC The MGC requests the MG built-in VIG through the Add ( Mux, Ra, Rb ) message to allocate the multiplexing module Mux, the audio endpoint Ra and the video endpoint Rb for the multimedia call, and the MG returns through the Add-Ack (Mux, Ra, Rb) message. The SDP attribute of the multiplex module Mux and the audio endpoint Ra and the video endpoint Rb allocated by the built-in VIG;
B4 - B6: 0一 MSC根据被叫用户的漫游号码将呼叫接续到被叫移动 终端（MT ), 并在 MT振铃并返回 ACM (地址全）消息后， 分别与 MO 和 MRBT进行能力协商； 所述 0_MSC与 MO及与 MRBT进行的能力协商过程可以通过以下 两种方式来实现： B4 - B6: 0-MSC connects the call to the called mobile terminal (MT) according to the roaming number of the called user, and after the MT rings and returns the ACM (address full) message, performs capability negotiation with MO and MRBT respectively; The process of negotiating the 0_MSC with the MO and the MRBT can be implemented in the following two ways:
第一种： 首先与 MO进行能力协商， 再与 MRBT进行能力协商； 第二种： 首先与 MRBT进行能力协商， 再与 MO进行能力协商； 其中， O— MSC与 MO进行能力协商的方法与步骤 A7 A10所述的 能力协商方法相同； 0—MSC与 MRBT进行能力协商的方法与步驟 A4 ~ A6所述的能力协商方法相同；  The first type: first, the capability negotiation with the MO, and then the capability negotiation with the MRBT; the second type: first, the capability negotiation with the MRBT, and then the capability negotiation with the MO; wherein, the method and the step of the O-MSC and the MO performing the capability negotiation The capability negotiation method described in A7 A10 is the same; 0—the method of capability negotiation between the MSC and the MRBT is the same as the capability negotiation method described in steps A4 to A6;
在 MO与 0— MSC的能力协商过程中 , MO通过 H.245信令消息中 的 TCS消息上报移动终端支持能力， O—MSC也通过 H.245信令消息中 的 TCS消息通知移动终端 O— MSC本身的音频和视频支持能力； MO和 0_MSC通过 H.245信令消息中的 MSD消息协商 H.324M多媒体数据流 中音频流和视频流的复用规则；  During the capability negotiation process between the MO and the 0-MSC, the MO reports the mobile terminal support capability through the TCS message in the H.245 signaling message, and the O-MSC also notifies the mobile terminal O through the TCS message in the H.245 signaling message. The audio and video support capabilities of the MSC itself; the MO and the 0_MSC negotiate the multiplexing rules of the audio stream and the video stream in the H.324M multimedia data stream through the MSD message in the H.245 signaling message;
B7: MRBT为 MO播放多媒体彩铃；  B7: MRBT plays multimedia ring tones for MO;
在该步骤中 , MRBT通过 OJVISC为本次呼叫分配的复用模块 Mux、 音频端点 Ra和视频端点 Rb为 MO播放多媒体彩铃，即 0— MSC的复用 模块 Mux将来自 MRBT的音频流和视频流复用成为 H.324M多媒体数 据流， 再发送到所述 MO。 此时， MO就可以看到多媒体彩铃业务所提 供的多媒体视频图像， 听到多媒体音频声音；  In this step, the MRBT uses the multiplexing module Mux, the audio endpoint Ra, and the video endpoint Rb allocated by the OJVISC for the call to play the multimedia ring back tone for the MO, that is, the multiplexing module Mux of the 0-MSC will input the audio stream and the video stream from the MRBT. It is multiplexed into an H.324M multimedia data stream and sent to the MO. At this point, the MO can see the multimedia video image provided by the multimedia ring back tone service, and hear the multimedia audio sound;
B8 - B11 : 当 MT应答时， O— MSC拆除 O— MSC到 MRBT的连接； 在本步骤中， 当 MT应答时， MT将发送 Connect消息到 T— MSC, T— MSC发送 ANM (应答） 消息到 0— MSC, 通知 0— MSC被叫用户已 经应答， 此时， O—MSC和 MRBT通过 BYE (再见）及响应消息 200， 拆除 O—MSC到 MRBT的连接；  B8 - B11: When the MT responds, the O-MSC removes the O-MSC to MRBT connection; In this step, when the MT answers, the MT will send a Connect message to the T-MSC, and the T-MSC sends an ANM (Answer) message. Go to 0 - MSC, notify 0 - the MSC called user has answered, at this time, O-MSC and MRBT remove the O-MSC to MRBT connection through BYE (goodbye) and response message 200;
B12: O—MSC 与 MT 进行能力协商， 如果本次能力协商结果和 OJVISC与 MO的能力协商结果一致，则删除 O—MSC在步骤 B3建立的 复用模块 Mux、 音频端点 Ra和视频端点 Rb， 否则， 在复用模块 Mux 和音频端点 Ra以及复用模块 Mux和视频端点 Rb之间插入相应的 TC, 进行编码转换； B12: The O-MSC negotiates with the MT. If the result of the capability negotiation is consistent with the result of the OJVISC and MO capability negotiation, the O-MSC is deleted in step B3. Multiplex module Mux, audio endpoint Ra and video endpoint Rb, otherwise, the corresponding TC is inserted between the multiplexing module Mux and the audio endpoint Ra and the multiplexing module Mux and the video endpoint Rb for coding conversion;
在该步骤中 , OJVISC与 MT进行能力协商过程与步骤 A7 ~ A10所 述的能力协商过程相同， 与 MT进行能力协商的目的是， 获知 MT的音 频、和视频支持能力，便于媒体网关完成 MO与 MT之间的流媒体转换； 在 O— MSC与 MT的能力协商结果与 MO—致的情况下， 由于不需 要复用模块 Mux、音频端点 Ra和视频端点 Rb进行编码转换， 因此， 为 了节省资源， 避免通信质量受到损伤， 应当删除 OJ SC在步骤 B3建 立的复用模块 Mux、 音频端点 Ra和视频端点 Rb;  In this step, the capability negotiation process between the OJVISC and the MT is the same as the capability negotiation process described in steps A7 to A10. The purpose of the capability negotiation with the MT is to know the audio and video support capabilities of the MT, so that the media gateway can complete the MO and the Streaming media conversion between MTs; in the case where the O-MSC and MT capability negotiation results are compared with MO, since the multiplexing module Mux, the audio endpoint Ra, and the video endpoint Rb are not required for encoding conversion, in order to save resources To avoid the damage of the communication quality, the multiplexing module Mux, the audio endpoint Ra and the video endpoint Rb established by the OJ SC in step B3 should be deleted;
B13 - B15: MO与 MT进行通话，在通话结束后， 0— MSC发送 REL (释放 )消息到 T— MSC, T— MSC发送 RLC (释放完成）消息到 0_MSC, 释放本次多媒体通话建立的链路。  B13 - B15: The MO makes a call with the MT. After the call ends, the 0-MSC sends a REL (Release) message to the T-MSC, and the T-MSC sends an RLC (Release Complete) message to the 0_MSC to release the chain established by the multimedia call. road.
从上述过程可以看出， 本实施例所述的方法通过在 MG内部实现了 VIG的功能， 可以实现 3G网络与固定通信网之间的多媒体互通。 另夕卜， 由于视频网关内置于 MSC,在 0— MSC与 MT及 M0的能力协商结果一 致的情况下，不需要复用模块 Mux、音频端点 Ra和视频端点 Rb进行编 码转换，使得呼叫过程不存在迂回路由，从而有效地避免了资源的浪费， 同时由于不存在迂回路由还可以提高移动终端之间多媒体业务的通信 质量。  It can be seen from the above process that the method described in this embodiment can realize the multimedia intercommunication between the 3G network and the fixed communication network by implementing the function of the VIG inside the MG. In addition, since the video gateway is built in the MSC, in the case that the 0-MSC and the MT and M0 capability negotiation results are consistent, the multiplexing module Mux, the audio endpoint Ra, and the video endpoint Rb are not required to perform coding conversion, so that the calling process is not There is a loop of the loop, thereby effectively avoiding waste of resources, and at the same time, the communication quality of the multimedia service between the mobile terminals can be improved because there is no loop.

Claims

权利要求书 Claim
1、 一种内置视频网关的移动交换中心， 包括： 媒体网关和媒体网关 控制器两部分， 其特征在于， 所述媒体网关内置有实现第三代网络和固 定通信网之间多媒体互通的视频网关单元，  A mobile switching center with a built-in video gateway, comprising: a media gateway and a media gateway controller, wherein the media gateway has a built-in video gateway for implementing multimedia interworking between the third generation network and the fixed communication network. Unit,
该视频网关单元将来自第三代移动通信 3G移动终端的 H.324M多 媒体数据流分解为 H.245信令、 音频流及视频流， 并将其中的 H.245信 令发送到媒体网关控制器 MGC, 将其中的音频流和视频流发送到所述 固定通信网； 同时将来自所述 MGC的 H.245信令以及来自固定通信网 的音频流和视频流复用成为 H.324M多媒体数据流发送到 3G移动终端。  The video gateway unit decomposes the H.324M multimedia data stream from the third generation mobile communication 3G mobile terminal into H.245 signaling, audio stream and video stream, and sends the H.245 signaling therein to the media gateway controller. An MGC, wherein the audio stream and the video stream are sent to the fixed communication network; and the H.245 signaling from the MGC and the audio stream and the video stream from the fixed communication network are multiplexed into an H.324M multimedia data stream Send to the 3G mobile terminal.
2、根据权利要求 1所述的移动交换中心， 其特征在于， 所述视频网 关单元包括： 端点 Tl、 音频端点 Ra、 视频端点 Rb以及复用模块 Mux; 其中， 端点 T1用于在 3G移动终端和复用模块之间传递 H.324M多 媒体数据流；  The mobile switching center according to claim 1, wherein the video gateway unit comprises: an endpoint T1, an audio endpoint Ra, a video endpoint Rb, and a multiplexing module Mux; wherein the endpoint T1 is used in the 3G mobile terminal Passing H.324M multimedia data stream with the multiplexing module;
复用模块 Mux用于将来自端点 T1的 H.324M多媒体数据流分解为 H.245信令、 音频流及视频流， 并将 H.245信令发送到所述 MGC， 将音 频流和视频流分别发送到音频端点 Ra和视频端点 Rb, 同时用于将来自 音频端点 Ra的音频流、 来自视频端点 Rb的视频流以及来自所述 MGC 的 H.245信令复用成为 H.324M多媒体数据流， 发送到端点 T1;  The multiplexing module Mux is configured to decompose the H.324M multimedia data stream from the endpoint T1 into H.245 signaling, audio stream and video stream, and send H.245 signaling to the MGC, the audio stream and the video stream. Sent to the audio endpoint Ra and the video endpoint Rb, respectively, for multiplexing the audio stream from the audio endpoint Ra, the video stream from the video endpoint Rb, and the H.245 signaling from the MGC into the H.324M multimedia data stream , sent to endpoint T1;
音频端点 Ra用于在复用模块 Mux和固定通信网之间传递音频流； 视频端点 Rb用于在复用模块 Mux和固定通信网之间传递视频流。 The audio endpoint Ra is used to pass the audio stream between the multiplexing module Mux and the fixed communication network; the video endpoint Rb is used to transfer the video stream between the multiplexing module Mux and the fixed communication network.
3、 一种实现多媒体互通的方法， 其特征在于， 所述方法包括： 移动终端发起呼叫， 内置有视频网关单元的始发移动交换中心检测 到需要将本次呼叫接续到固定通信网多媒体业务网元后， 令其内置的视 频网关单元为本次呼叫分配复用模块、 音频端点和视频端点； 所述始发移动交换中心分别与移动终端及固定通信网多媒体业务网 元进行能力协商； A method for implementing multimedia intercommunication, the method comprising: the mobile terminal initiates a call, and the originating mobile switching center with the built-in video gateway unit detects that the call needs to be connected to the fixed communication network multimedia service network. After the element, let its built-in video gateway unit allocate multiplexing modules, audio endpoints and video endpoints for the call; The originating mobile switching center performs capability negotiation with the mobile terminal and the fixed service network multimedia service network element respectively;
能力协商完成后， 移动终端与所述固定通信网多媒体业务网元通过 由所述始发移动交换中心内置的视频网关单元分配的复用模块、 音频端 点和视频端点进行多媒体通信。  After the capability negotiation is completed, the mobile terminal and the fixed communication network multimedia service network element perform multimedia communication through the multiplexing module, the audio terminal and the video endpoint allocated by the video gateway unit built in the originating mobile switching center.
4、根据权利要求 3所述的方法， 其特征在于， 所述始发移动交换中 心包括媒体网关和媒体网关控制器， 其中所述媒体网关内置有视频网关 单元；  The method according to claim 3, wherein the originating mobile switching center comprises a media gateway and a media gateway controller, wherein the media gateway has a video gateway unit built therein;
所迷为本次呼叫分配复用模块、 音频端点和视频端点包括： 媒体网关控制器通过标准的 H.248消息向媒体网关中内置的视频网 关单元请求为本次呼叫分配复用模块、 音频端点和视频端点；  The call distribution multiplexing module, the audio endpoint and the video endpoint are included in the call: the media gateway controller requests the video gateway unit built in the media gateway to allocate a multiplexing module and an audio endpoint to the call through a standard H.248 message. And video endpoints;
媒体网关中内置的视频网关单元为本次呼叫分配复用模块、 音频端 点和视频端点， 并通过响应消息返回所分配复用模块及音频端点、 视频 端点的会话描述协议属性到媒体网关控制器。  The video gateway unit built in the media gateway allocates a multiplexing module, an audio terminal and a video endpoint for the call, and returns the session description protocol attribute of the allocated multiplexing module and the audio endpoint and the video endpoint to the media gateway controller through the response message.
5、根据权利要求 3所述的方法， 其特征在于， 所述始发移动交换中 心与移动终端进行能力协商包括：  The method according to claim 3, wherein the initial mobility switching center performs capability negotiation with the mobile terminal, including:
移动终端上报自身多媒体支持能力到媒体网关控制器， 始发移动交 换中心根据移动终端上报的能力以及自身的多媒体支持能力分配相应 的资源， 并向移动终端反馈自身的多媒体支持能力；  The mobile terminal reports its own multimedia support capability to the media gateway controller, and the originating mobile switching center allocates corresponding resources according to the capability reported by the mobile terminal and its own multimedia support capability, and feeds back the multimedia support capability to the mobile terminal;
移动终端和始发移动交换中心协商本次呼叫过程中音频流和视频流 的复用规则以及相关的参数；  The mobile terminal and the originating mobile switching center negotiate a multiplexing rule of the audio stream and the video stream during the call and related parameters;
移动终端和始发移动交换中心根据所述音频流和视频流的复用规则 为本次呼叫的音频流和视频流分配相应的逻辑信道。  The mobile terminal and the originating mobile switching center allocate corresponding logical channels for the audio stream and the video stream of the call according to the multiplexing rules of the audio stream and the video stream.
6、 根据权利要求 5所述的方法， 其特征在于，  6. The method of claim 5, wherein
所述多媒体支持能力由 H.245信令的终端能力集消息承载； 所述音频流和视频流的复用规则由 H.245信令的主从决定消息承 载； The multimedia support capability is carried by a terminal capability set message of H.245 signaling; The multiplexing rules of the audio stream and the video stream are carried by the master-slave decision message of the H.245 signaling;
所述分配逻辑信道通过 H.245信令打开逻辑信道消息来实现。  The allocating logical channel is implemented by opening a logical channel message by H.245 signaling.
7、根据权利要求 3或 6所述的方法， 其特征在于， 所述始发移动交 换中心与移动终端进行能力协商包括：  The method according to claim 3 or 6, wherein the initial mobile switching center and the mobile terminal perform capability negotiation:
移动终端将包含所述终端能力集消息、 主从决定消息或打开逻辑信 道消息的 H.245信令复用在 H.324M多媒体数据流中， 发送到媒体网关 的复用模块， 所述复用模块从 H.324M多媒体数据流中解复用出 H.245 信令， 发送到所述媒体网关控制器；  The mobile terminal multiplexes the H.245 signaling including the terminal capability set message, the master-slave decision message, or the open logical channel message in the H.324M multimedia data stream, and sends the multiplexing module to the media gateway, where the multiplexing The module demultiplexes H.245 signaling from the H.324M multimedia data stream and sends the signal to the media gateway controller;
所述媒体网关控制器通过将包含能力集消息、 主从决定消息或打开 逻辑信道消息的 H.245信令发送到媒体网关的复用模块， 所述复用模块 将所接收的 H.245信令复用在 H.324M多媒体数据流中， 发送到所述移 动终端。  The media gateway controller sends the H.245 signaling including the capability set message, the master-slave decision message, or the open logical channel message to the multiplexing module of the media gateway, where the multiplexing module receives the received H.245 letter The multiplex is multiplexed in the H.324M multimedia data stream and sent to the mobile terminal.
8、根据权利要求 3所述的方法， 其特征在于， 所述始发移动交换中 心与所述固定通信网多媒体终端进行能力协商为：  The method according to claim 3, wherein the initial mobile switching center and the fixed communication network multimedia terminal perform capability negotiation as follows:
始发移动交换中心向固定通信网多媒体业务网元发送邀请消息， 并 在该消息中携带为本次呼叫分配的音频端点和视频端点的会话描述协 议属性， 通知所述固定通信网多媒体业务网元始发移动交换中心为本次 呼叫分配的音频和视频资源；  The originating mobile switching center sends an invite message to the fixed service network multimedia service network element, and carries the session description protocol attribute of the audio endpoint and the video endpoint allocated for the call, and notifies the fixed service network multimedia service network element The audio and video resources allocated by the originating mobile switching center for this call;
所述固定通信网多媒体业务网元获知始发移动交换中心为本次呼叫 分配的音频、 视频资源后， 响应 180和 200消息， 结束所述能力协商过 程。  After the fixed communication network multimedia service network element learns the audio and video resources allocated by the originating mobile switching center for the call, it responds to the 180 and 200 messages, and ends the capability negotiation process.
9、 ^^据权利要求 3所述的方法， 其特征在于， 所述移动终端与所述 固定通信网多媒体业务网元通过始发移动交换中心分配的复用模块、 音 频端点和视频端点进行多媒体通信包括： 始发移动交换中心的复用模块将来自移动终端的 H.324M多媒体数 据流解复用为 H.245信令、 音频流和视频流， 将其中的音频流和视频流 分别通过音频端点和视频端点发送到所述固定通信网多媒体业务网元； 始发移动交换中心的复用模块将通过音频端点和视频端局接收的， 来自所述固定通信网多媒体业务网元的音频流和视频流， 及自身产生的 H.245信令复用成为 H.324M多媒体数据流， 发送到所述移动终端。 The method according to claim 3, wherein the mobile terminal and the multimedia network element of the fixed communication network perform multimedia through a multiplexing module, an audio endpoint and a video endpoint allocated by the originating mobile switching center. Communication includes: The multiplexing module of the originating mobile switching center demultiplexes the H.324M multimedia data stream from the mobile terminal into H.245 signaling, audio stream and video stream, and passes the audio stream and the video stream through the audio endpoint and the video respectively. The endpoint sends the multimedia service network element to the fixed communication network; the multiplexing module of the originating mobile switching center receives the audio stream and the video stream from the fixed service network multimedia service network element through the audio endpoint and the video end office, And the self-generated H.245 signaling is multiplexed into an H.324M multimedia data stream and sent to the mobile terminal.
10、 根据权利要求 3所述的方法， 其特征在于， 若所述始发移动交 换中心与移动终端及与固定通信网多媒体业务网元的能力协商结果不 一致， 则所述方法进一步包括：  The method according to claim 3, wherein if the originating mobile switching center does not coincide with the mobile terminal and the capability negotiation result of the multimedia service network element of the fixed communication network, the method further includes:
在所述内置视频网关单元的复用模块和音频端点 Ra及复用模块 Mux和视频端点 Rb之间插入用于完成流媒体编码的转换的编解码转换 资源， 进行所述移动终端与所述固定通信网多媒体业务网元之间多媒体 支持能力的适配。  Inserting a codec conversion resource for performing conversion of the streaming media code between the multiplexing module of the built-in video gateway unit and the audio endpoint Ra and the multiplexing module Mux and the video endpoint Rb, performing the mobile terminal and the fixing Adaptation of multimedia support capabilities between multimedia service network elements of the communication network.
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