WO2007016874A1 - Centre de commutation de mobiles a passerelle video et procede d'interfonctionnement multimedia - Google Patents

Centre de commutation de mobiles a passerelle video et procede d'interfonctionnement multimedia 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
English (en)
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/fr

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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

Cette invention concerne un centre de commutation de mobiles à passerelle vidéo, en deux parties passerelle média et contrôleur de passerelle média laquelle passerelle média est incorporée à une unité de passerelle vidéo pour la mise en oeuvre d'un interfonctionnement multimédia entre la technologie 3G (troisième génération) et le réseau de communication fixe, ainsi qu'un procédé correspondant. La commutation multimédia s'obtient au moyen du centre de commutation de mobiles et du procédé, sans le surcoût afférent à la construction d'installations, au fonctionnement et à l'entretien. Cette invention permet d'éviter le gaspillage des ressources système et d'améliorer la qualité du service multimédia grâce à l'utilisation des circuits existants pendant l'appel.
PCT/CN2006/002030 2005-08-11 2006-08-10 Centre de commutation de mobiles a passerelle video et procede d'interfonctionnement multimedia WO2007016874A1 (fr)

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