WO2009024043A1 - Equipement de passerelle d'interfonctionnement vidéo, système et procédé pour réaliser un service d'appel vidéo - Google Patents

Equipement de passerelle d'interfonctionnement vidéo, système et procédé pour réaliser un service d'appel vidéo Download PDF

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Publication number
WO2009024043A1
WO2009024043A1 PCT/CN2008/071635 CN2008071635W WO2009024043A1 WO 2009024043 A1 WO2009024043 A1 WO 2009024043A1 CN 2008071635 W CN2008071635 W CN 2008071635W WO 2009024043 A1 WO2009024043 A1 WO 2009024043A1
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WIPO (PCT)
Prior art keywords
entity
calling
video
negotiation
called
Prior art date
Application number
PCT/CN2008/071635
Other languages
English (en)
French (fr)
Inventor
Hong Zhang
Gaofeng Yang
Lin Lin
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.
Priority to KR1020097017985A priority Critical patent/KR101074888B1/ko
Priority to EP08783695.3A priority patent/EP2114049B1/en
Publication of WO2009024043A1 publication Critical patent/WO2009024043A1/zh
Priority to US12/538,591 priority patent/US8560717B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/14—Systems for two-way working
    • H04N7/141—Systems for two-way working between two video terminals, e.g. videophone
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/16—Gateway arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/66—Arrangements for connecting between networks having differing types of switching systems, e.g. gateways
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/10—Architectures or entities
    • H04L65/102—Gateways
    • H04L65/1033—Signalling gateways
    • H04L65/104—Signalling gateways in the network
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1069—Session establishment or de-establishment
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/1066—Session management
    • H04L65/1083—In-session procedures
    • H04L65/1095—Inter-network session transfer or sharing
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/42017—Customized ring-back tones
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/24—Negotiation of communication capabilities

Definitions

  • Video interworking gateway device video call service implementation system and method
  • the present invention relates to communication systems, and in particular, to a technology for implementing a video call service.
  • the basic network structure of the third generation mobile communication system (The Third Generation, 3G) is composed of a core network (CN), a radio access network (RAN), and a user equipment (UE).
  • the main function of the CN is to transfer and address the communication between the UEs.
  • the CN is divided into a Circuit Switch (CS) and a Packet Switch (PS).
  • CS Circuit Switch
  • PS Packet Switch
  • the biggest feature of the CS domain is based on circuit switching, stable transmission characteristics, low latency and bandwidth guarantee, and can provide 64K bandwidth resources for each UE.
  • the 3G network can provide mobile video (Video Phone, VP) call service.
  • the mobile VP call service is a new mobile service that transmits video content to users through 3G networks and 3G terminals, so that users can not only hear each other when talking, but also See the video image of the other party in real time.
  • the mobile VP call service is the same as the traditional voice service, and the narrowband circuit bearer refers to the communication data transmitted on the narrowband circuit.
  • H.324 series of low-rate multimedia interworking protocols which are dedicated to mobile VP calling services, including the H.245 protocol (Control Protocol for Multimedia Communication, Multimedia Communication Control Protocol), H.223 Protocol, etc.
  • the H.245 protocol specifies the signaling for implementing multimedia communication;
  • the H.223 protocol specifies the multiplexing method for implementing multimedia communication, and the audio data and video data of multimedia communication are synthesized by a specific multiplexing method. flow.
  • each 3G terminal can be regarded as an H.324 entity, and these H.324 entities are carried by a narrowband circuit, that is, the mobile VP call service is carried out in the CS domain in the 3G network.
  • H.324 entity The H.245 protocol-compliant audio stream, video stream and control stream involved in the mobile VP call service are multiplexed on a narrowband circuit with a bandwidth of 64 kbit/s through the H.223 protocol.
  • the following mobile VP call service is referred to as VP call service.
  • the process of a VP call service can be divided into the following two phases: The first stage: The bearer narrowband circuit is switched on by the narrowband ISUP (Integrated Services Digital Network User Part) signaling.
  • the narrowband ISUP Integrated Services Digital Network User Part
  • the second stage Based on the narrowband circuit that has been connected, the parameter negotiation between the H.324 entities of the two parties is carried out.
  • the content of the negotiation includes the audio and video codec mode and the audio and video codec used in the H.245 protocol.
  • the multiplexing parameters conforming to the H.223 protocol and the multiplexed audio and video logical channels and other parameters are used.
  • the H.324 entities of the two parties communicate with each other according to the negotiation parameters to carry out the VP call service.
  • the switching of the user's call object is directly modified by the circuit switching device to carry the narrowband circuit.
  • the calling user A1 initiates a call to the called user C1
  • the call first goes to the Mobile Switching Center (MSC), and the MSC queries the called user CI to register the CRBT service.
  • the MSC routes the call to the CRBT center, and the CRBT center initiates a call to the called user C1.
  • the CRBT center broadcasts a customized ring tones of the called user C1 to the calling user A1.
  • the call object is the device B1 that plays the audio CRBT in the CRBT center. After the called user C1 picks up the phone and answers the call, the circuit switching device in the CRBT center directly modifies the narrowband circuit overlap, and the calling user A1 is The call object is switched by the device B1 to the called user C1, and the primary and called users A1 and C1 are turned on.
  • the above processing method has certain problems.
  • the H.324 entities A2 and B2 perform the VP call service after completing the parameter negotiation. If it is necessary to switch the A2 call object from B2 to another H.324 entity C2, In the first phase of the VP call service, the narrowband circuit modification involved is the same as that in the 2G network, and the narrowband circuit overlap is directly modified by the circuit switching device; however, there is a problem with the parameter negotiation between the H.324 entities involved in the second phase.
  • A2 which has already conducted a negotiation and is in a normal call state, the call object suddenly changes from a B2 in a normal call state to a C2 in an initial state, and A2 does not know the change of the other party, A2 will It is considered that the B2 is abnormal, and the VP call service between A2 and C2 cannot be performed normally, and the call is removed.
  • a video interworking gateway is used to implement a VP call service between an H.324 entity and a broadband resource device.
  • VIG is a physical entity capable of providing video interworking gateway resources.
  • the video interworking gateway resource is a logical entity embodying the function of the video interworking gateway.
  • VIG can provide multiple video interworking gateway resources.
  • the VIG VP call service must have an H.324 entity at one end, and generally adopts a narrowband circuit bearer based on Time Division Mupkmng (TDM) technology; one end is a broadband resource device, which is generally based on a real-time transport protocol (Real -time Transfer Protocol, RTP) Broadband IP bearer.
  • TDM Time Division Mupkmng
  • RTP Real-time Transfer Protocol
  • Broadband IP bearer refers to the transmission of communication data over a broadband IP network.
  • the VIG is used to implement the VP call service between the H.324 entity and the broadband resource device.
  • the implementation process is that the VIG and the H.324 entity perform parameter negotiation. After the negotiation succeeds, the H.324 entity is connected to the broadband resource device, and the H.324 entity is associated with
  • VIG uses a video interworking gateway resource to perform heavy media stream encoding and decoding between two heterogeneous networks.
  • the VP call service supported by VIG has one end being the H.324 entity in the CS domain 3G network, and the other end is the broadband resource device, and the VIG cannot VP call service between the two H.324 entities. Provide services.
  • the embodiment of the invention provides a system and a method for implementing a video interworking gateway device and a VP call service, which can switch the calling object of the calling H.324 entity from the broadband resource device to the called H.324 under the premise of continuous conversation. Entity, the case where the call object that handles the H.324 entity changes.
  • An embodiment of the present invention provides a video interworking gateway device, including:
  • a broadband resource connection unit configured to connect a calling H.324 entity and a broadband resource device of a video call service that requires a broadband resource device to perform video mode playback;
  • a parameter negotiation unit configured to perform parameter negotiation with the calling H.324 entity, obtain a negotiation parameter of the calling H.324 entity, and notify the broadband resource connection unit to connect the calling H.324 entity after the negotiation succeeds. Go to the broadband resource device; and perform parameter negotiation with the called H.324 entity of the video call service to obtain the negotiation parameter of the called H.324 entity;
  • a parameter storage unit configured to save a negotiation parameter of the calling H.324 entity and the called H.324 entity acquired by the parameter negotiation unit;
  • the parameter exchange unit is configured to send the negotiation parameters of the calling H.324 entity and the called H.324 entity saved by the parameter storage unit to the other party respectively.
  • the embodiment of the invention provides a system for implementing a video call service, including a video interworking gateway device, a broadband resource device, and a bearer bonding device, where:
  • the video interworking gateway device and the calling H.324 entity of the video calling service that requires the broadband resource device to perform video mode playback perform parameter negotiation, and obtain negotiation parameters of the calling H.324 entity. And after the negotiation succeeds, the calling H.324 entity is connected to the broadband resource device;
  • the video interworking gateway device and the called H.324 entity of the video call service perform parameter negotiation, acquire the negotiation parameters of the called H.324 entity, and call the calling H.324 entity and the called H.324 entity.
  • the negotiation parameters are respectively sent to the other party, and the connection between the calling H.324 entity and the broadband resource device is disconnected;
  • the broadband resource device is configured to perform video mode playback on the calling H.324 entity; the bearer bonding device is configured to disconnect the calling H.324 entity and the broadband resource device in the video interworking gateway device.
  • the bearer between the calling H.324 entity and the called H.324 entity is spliced.
  • the embodiment of the present invention provides a method for implementing a video call service, including: performing parameter negotiation with a calling H.324 entity of a video call service that requires a broadband resource device to perform video mode playback, and acquiring a calling H.324 entity.
  • the parameter is negotiated with the called H.324 entity of the video call service, and the negotiation parameters of the called H.324 entity are obtained.
  • the negotiation parameters of the calling H.324 entity and the called H.324 entity are respectively sent to the other party, the connection between the calling H.324 entity and the broadband resource device is disconnected, and the calling H.324 entity and the called party are overlapped. 7 between H.324 entities.
  • the video interworking gateway device and the VP call service implementation system and method provided by the embodiments of the present invention use the video interworking gateway device to perform parameter negotiation with the calling H.324 entity, and after the negotiation succeeds, connect the calling H.324 entity to the broadband resource device. Realizing the playback of the calling H.324 entity video mode; switching the calling object of the calling H.324 entity to the called H.324 entity, the calling H.324 entity and the called H.
  • the VP call service between the 324 entities solves the situation in which the call object of the H.324 entity in the video call service that requires the broadband resource device to perform video playback is changed, and the smooth development of each video call service is ensured.
  • the bearer between the calling H.324 entity and the called H.324 entity is between the primary and the called H.324 entities.
  • FIG. 1 is a schematic diagram of video interworking of a VIG in the prior art
  • FIG. 2 is a block diagram of a system for implementing a VP call service according to an embodiment of the present invention
  • FIG. 3 is a flowchart of a method for implementing a VP call service according to an embodiment of the present invention
  • FIG. 4 is a schematic diagram of networking of a video ring back tone service according to an embodiment of the present invention.
  • FIG. 5 is a flowchart of processing a video ring back tone service according to an embodiment of the present invention.
  • FIG. 6 is a flowchart of processing an online monitoring service according to another embodiment of the present invention.
  • the VP call services that are required to be played based on the VP call service, and may also include the number of VP call services, such as video ring back tone service, online monitoring service, etc. .
  • Video mode playback is to play a video and voice to the user.
  • the video mode is to receive feedback from the user according to the video and voice prompts.
  • the VP call service has a common scenario mode: the calling H.324 entity initiates a VP call service to the 3G network, and the 3G network connects the calling H.324 entity to the broadband resource device responsible for video playback and receiving, and the broadband resource. After the device plays a video and voice to the calling H.324 entity, and may also include the receiving number, the calling H.324 entity needs to carry out the VP calling service with the called H.324 entity with video capability on the premise of continuous voice. During the whole VP call service development process, the calling H.324 entity first initiates a VP call service with the broadband resource device, and then needs to switch the call object of the calling H.324 entity from the broadband resource device to the nickname under the premise of continuous call.
  • VP call service is carried out between the calling H.324 entity and the called H.324 entity.
  • the call object is switched in the entire VP call service. If the second negotiation is not performed between the calling H.324 entity and the called H.324 entity before the call object is switched, the call is interrupted. Therefore, a secondary negotiation mechanism needs to be established between the calling H.324 entity and the called H.324 entity to ensure the smooth development of the entire VP calling service.
  • the root cause of the second negotiation problem is that the call object is switched in the whole VP call service process, and the handover is performed by the bearer lap device.
  • the multimedia data of the VP call service is transmitted on the narrowband circuit. That is, the narrowband circuit is carried, and the bearer bonding device is a circuit switching device responsible for the strapping of the narrowband circuit.
  • the bearer bonding device is Broadband IP connection between the calling H.324 entity and the called H.324 entity Connected network entities.
  • the embodiment of the invention provides a VP call service implementation scheme, and integrates a video interworking gateway device with a video interworking gateway function on the bearer lap device.
  • the video interworking gateway device and the calling H.324 entity perform parameter negotiation. After the negotiation succeeds, the video interworking gateway device connects the calling H.324 entity to the broadband resource device, and is completed by the broadband resource device.
  • the playback of the H.324 entity video mode of the calling party may also include receiving a number.
  • the video interworking gateway device uses a video interworking gateway resource to perform heavy media stream encoding and decoding, etc., which is the calling party H.324.
  • the video interworking gateway device When the H.324 entity arrives at the called H.324 entity, it is first called out by the video interworking gateway device to the called H.324 entity to perform parameter negotiation with the called H.324 entity; then the video interworking gateway device is at the primary and the called H.
  • the negotiation parameters are exchanged between the .324 entities, and the video interworking gateway device can also compare the negotiation parameters of the primary and the called H.324 entities, and after confirming that the negotiation parameters are inconsistent, exchange the negotiation parameters between the primary and the called H.324 entities; After the negotiation parameters are exchanged, the calling H.324 entity and the called H.324 entity understand each other's negotiation parameters, disconnect the calling H.324 entity and the broadband resource device, and are connected by the bearer.
  • the device performs the lap connection between the calling H.324 entity and the called H.324 entity, and the primary and the called H.324 entity directly carry out the VP calling service according to the connected bearer, where the bearer includes the narrowband circuit bearer and Broadband IP bearer.
  • the embodiment of the present invention provides a video interworking gateway device 21, including: a broadband resource connection unit 211, configured to connect a calling party H.324 of a VP calling service that requires a broadband resource device to perform video mode playback. An entity and the broadband resource device;
  • the parameter negotiation unit 212 is configured to perform parameter negotiation with the calling H.324 entity, obtain a negotiation parameter of the calling H.324 entity, and notify the broadband resource connection unit 211 to call the calling H.324 after the negotiation succeeds.
  • the entity is connected to the broadband resource device; and performs parameter negotiation with the called H.324 entity of the VP call service to obtain a negotiation parameter of the called H.324 entity;
  • a parameter storage unit 213, configured to save a negotiation parameter of the calling H.324 entity and the called H.324 entity acquired by the parameter negotiation unit 212;
  • a parameter exchange unit 214 configured to store the calling H.324 entity in the parameter storage unit 213, The negotiation parameters of the called H.324 entity are sent to the other party.
  • the parameter exchange operation performed by the parameter exchange unit 214 is not necessary, and the video interworking gateway device 21 further includes:
  • the parameter comparison unit 215 is configured to compare the negotiation parameters of the primary and the called H.324 entities held by the parameter storage unit 213, and trigger the parameter exchange unit 214 to perform parameter exchange when the negotiation parameters of the two parties are different.
  • the video interworking gateway device provided by the embodiment of the present invention provides a video call service implementation system, including a video interworking gateway device 21, a broadband resource device 22, and a bearer bonding device 23, where:
  • the video interworking gateway device 21 and the broadband resource device 22 are required to perform video mode playback.
  • the calling H.324 entity of the VP calling service performs parameter negotiation, obtains the negotiation parameter of the calling H.324 entity, and connects the calling H.324 entity to the broadband resource device 22 after the negotiation is successful;
  • the video interworking gateway device 21 and the called H.324 entity of the VP call service perform parameter negotiation, acquire the negotiation parameters of the called H.324 entity, and call the calling H.324 entity and the called H.324 entity.
  • the negotiation parameters are respectively sent to the other party, and the connection between the calling H.324 entity and the broadband resource device 22 is disconnected;
  • the broadband resource device 22 is configured to perform video mode playback on the calling H.324 entity; the bearer bonding device 23 is configured to disconnect the calling H.324 entity and the broadband resource in the video interworking gateway device 21.
  • the connection between the devices 22 overlaps the bearer between the calling H.324 entity and the called H.324 entity.
  • the bearer bonding device 23 includes a circuit switched device.
  • the called H.324 entity includes a video capable 3G terminal and a network device supporting H.324 interworking, such as a video interworking gateway VIG, an MCU for video conferencing, and the like.
  • the embodiment of the present invention further provides a method for implementing a VP call service. As shown in FIG. 3, the method includes the following steps:
  • the calling H.324 entity of the VP calling service that requires the broadband resource device to perform video mode playback performs parameter negotiation, obtains the negotiation parameter of the calling H.324 entity, and after the negotiation is completed normally, the calling party H.324 An entity is connected to the broadband resource device;
  • S303 Send the negotiation parameters of the calling H.324 entity and the called H.324 entity to the other party, disconnect the connection between the calling H.324 entity and the broadband resource device, and connect the calling H.324 entity. Bearer between the called H.324 entity.
  • the method may further comprise the steps of:
  • the embodiment of the present invention provides a system and a method for implementing a VP call service, which are used to process a change of a call object of an H.324 entity when a VP call service is initiated, to ensure smooth development of each VP call service;
  • the solution provided by the embodiment of the present invention needs to utilize the function of the video interworking gateway, but strives to minimize the dependence on the video interworking gateway resources.
  • the splicing master The bearer between the H.324 entity and the called H.324 entity directly carries out the video call service between the active and the called H.324 entities, releasing the video interworking gateway resources and the broadband resources.
  • the video interworking is performed.
  • the occupancy of the gateway resources is mainly in the phase of connecting the calling H.324 entity to the broadband resource device.
  • only one video interworking gateway resource is needed, and the duration of the phase relative to the entire VP calling service generally only occupies a small space. Proportion, so using this solution will greatly reduce the dependence of the corresponding VP calling service on the video interworking gateway resources. Specific instructions.
  • a video ring back tone service in a WCDMA network is a specific embodiment of a VP call service that requires a broadband resource device to perform video mode playback in a CS domain 3G network.
  • the schematic diagram of the video CRBT service networking in the WCDMA network is shown in Figure 4.
  • the network entities involved include the Mobile Switching Center Server (MSC Server), the Media Gateway (MGW), and the Multimedia Ring Back Tone (MRBT). Home Location Register (HLR).
  • the MRBT is used to process the video ring back tone service, which is a specific application platform of this embodiment.
  • the MRBT includes circuit-switched equipment and IP resource equipment with broadband resource capabilities.
  • the circuit switching device is the bearer connection device, and the IP resource device is the broadband resource device, the calling user and the called user.
  • the 3G terminals used are all H.324 entities, and the called user registers the video ring back tone service.
  • the call flow of the video ring back tone service is: the calling user initiates a VP call to the called user, and the VP call initiated by the calling user first goes to the WCDMA network, and the MSC in the network receives the call and queries the HLR whether the called user has registered the video.
  • the MSC In the CRBT service, when the called user registers the video ring back tone service, the MSC routes the call to the MRBT. After the MRBT analysis, the VP call is initiated to the called user. After the called user rings, the MRBT plays a segment to the calling user.
  • this service scenario is a VP call service that requires a broadband resource device to perform video mode playback according to an embodiment of the present invention.
  • an IP resource device having a broadband resource capability in the MRBT first forwards to the calling user.
  • the video mode is played, that is, the calling user and the IP resource device perform the VP call service; when the called user picks up the call, the calling party's call object is switched to the called user, the calling user and the called party.
  • VP call services are initiated between users.
  • the video interworking gateway device provided by the embodiment of the present invention is integrated in the MRBT system, and the MRBT performs parameter negotiation with the calling user through the video interworking gateway device. After the negotiation succeeds, the calling user is connected to the IP resource device. The IP resource device plays the video ring back tone to the calling user.
  • the video interworking gateway device negotiates parameters with the called user, and exchanges the negotiation parameters of the calling and called users, and disconnects the calling party H.
  • the connection between the .324 entity and the broadband resource device and is carried by the circuit switching device over the narrowband circuit between the primary and the called user.
  • the processing flow of the video CRBT service is shown in Figure 5.
  • the solid line message is the Q931 and isup messages related to the call control.
  • the single-point and dual-line is the H.245 message for the parameter negotiation between the video interworking gateway device and the calling user.
  • the point single line is an H.245 message for the parameter negotiation between the video interworking gateway device and the called user.
  • the processing procedure of the video ring back tone service includes the following steps:
  • the calling user initiates a VP call to the called user, and the VP call initiated by the calling user first goes to the WCDMA network, and the calling side mobile switching center server 0-MSC sends a routing message to the HLR, and the HLR receives the routing message.
  • the called mobile switching center server T-MSC is required to provide the roaming number of the called user. After obtaining the roaming number of the called user, the HLR finds that it has registered the video CRBT service, and notifies that the MSC routes the VP call initiated by the calling user. To MRBT;
  • the video interworking gateway device in the MRBT initiates a VP call to the T-MSC according to the roaming number of the called user;
  • S510-S513, T-MSC receives the ringing signal sent by the called user, and the MRBT transmits the signal to the calling side;
  • the MRBT receives the playback command, and then sends a connection to the calling user, prepares to receive the call, and performs video playback on the calling user;
  • the video interworking gateway device and the calling user begin to perform parameter negotiation, specifically: the video interworking gateway device and the calling user start H.245 negotiation, and first perform capability exchange, to ensure that the calling user opens the logical channel for selection.
  • the media format is widely used and supported by general users.
  • the media capability in the Terminal Capability Set (TCS) sent by the video interworking gateway device should be the most commonly used in 3G networks, such as H263 for video and audio.
  • TCS Terminal Capability Set
  • the video interworking gateway device performs master-slave negotiation with the calling user.
  • the master-slave negotiation is an optional part.
  • the function is to determine that one end of the two parties is the master party, and one end is the slave party, so that some special Avoid conflicts during operation. For example, open the video logical channel, which is usually opened by the master. If both parties send this operation, conflicts may occur.
  • the video interworking gateway device and the calling user exchange multiplex table, and the video interworking gateway device saves the multiplex table of the calling user for subsequent parameter exchange, and the mutual multiplex table is two H.324 entities.
  • the composition of the H.223 multiplexed stream of the party informs the other party, including specific logical channels, such as audio logical channels, video logical channels, etc., and whether there is channel nesting, etc., that is, telling the call party how to multiplex the stream from H.223 Decompose the data in each logical channel;
  • the video interworking gateway device and the calling user mutually send an Open Logical Channel (OCC) message, and the sending open logical channel message is used to inform the other party to start sending audio or video data, and the other party is ready to receive, and the audio logical channel is opened.
  • OCC Open Logical Channel
  • the message is generally unidirectional and needs to be sent to each other.
  • the video channel information is opened in both directions. Generally, it is opened by the calling user.
  • the video interworking gateway device is opened.
  • the media capability parameter and the multiplexing parameter are saved therein for use in subsequent parameter exchange;
  • the calling user and the video interworking gateway device negotiate successfully, and the video interworking gateway device connects the calling user to the IP resource device, and the IP resource device plays a video ring tones customized by the called user to the calling user, and the IP resource device sends the video ring to the calling user.
  • the video interworking gateway device uses a video interworking gateway resource to perform heavy codec operations; at the same time, the calling user waits for the called user to pick up the phone and answer the call. S520-S521, the called user picks up the phone and answers, and the video interworking gateway device in the MRBT receives the off-hook response message of the called user, and then sends a connection to the called user;
  • the video interworking gateway device and the called user start H.245 negotiation, and firstly perform capability exchange.
  • the media capability of the terminal capability set sent by the video interworking gateway device is used after the calling user negotiates to receive the audio and video.
  • Ability
  • the video interworking gateway device performs master-slave negotiation with the called user
  • the video interworking gateway device and the called user mutually transmit a multiplexing table, and save the multiplexed table related to the current VP calling service by the called user for subsequent parameter exchange, and the saved multiplexing table is in the current VP call. Released at the end of the business;
  • the video interworking gateway device receives two open logical channel messages of audio and video sent by the called user;
  • the video interworking gateway device exchanges negotiation parameters between the calling user and the called user, and disconnects the connection between the calling user and the broadband resource device;
  • the video interworking gateway device sends the saved multiplexing table of the calling user and the called user to the calling party;
  • the video interworking gateway device sends a request to the calling user to close the Video Channel (RCC) message, requesting the calling user to turn off the video logical channel that is turned on; the video interworking gateway device sends the closed audio to the calling user.
  • RRC Video Channel
  • a Close Logical Channel (CLC) message informs the calling user that the audio logical channel opened by the calling user has been turned off; thus the video interworking gateway device disconnects the connection between the calling user and the broadband resource device, releasing the broadband Resource
  • the video interworking gateway device sends an open audio logical channel message to the called user, where the carried parameter is completely consistent with the saved open user logical channel message of the calling user; the video interworking gateway device sends the open video logical channel message to the called user.
  • the parameter carried therein is completely consistent with the saved video channel message of the calling user; the video interworking gateway device sends an open audio logical channel message to the calling user, where the parameter carried and the saved audio channel of the called user are opened.
  • the message is completely consistent; thus, the video interworking gateway device completes the parameter between the calling user and the called user.
  • the number exchange realizes the secondary negotiation between the calling user and the called user;
  • the circuit switching device switches the calling object of the calling user, and performs a narrowband circuit between the primary and the called user by modifying the circuit to enable the primary and the called user to directly perform the VP calling service through the narrowband circuit.
  • the online monitoring service is a specific embodiment in another CS domain 3G network of a VP calling service that requires a broadband resource device to perform video mode playback.
  • the specific application platform for the online monitoring service is the online monitoring service platform (IMR).
  • the IMR has circuit-switching equipment and broadband resource equipment used for video playback and collection with users; the calling user who needs online monitoring service
  • the 3G terminal is an H.324 entity; the calling user installs the monitoring terminal at the place where monitoring is required, and the monitoring terminal is basically the same as the ordinary 3G terminal, and only simple modification such as automatic connection, waterproofing, reinforcement, etc. can be performed, each The monitoring terminal has a call-controlled number, and the monitoring terminal is also an H.324 entity.
  • the implementation process of the online monitoring service is as follows: When the calling user uses the online monitoring service, the specific service code is first called and connected to the IMR.
  • the IMR authenticates the calling user through video playback and receiving, and obtains the calling user. Specify the monitoring terminal number of the monitoring point; After obtaining the monitoring terminal number, the IMR connects the calling user to the monitoring terminal, so that the calling user can see the video image of the monitoring point.
  • the service scenario is a VP call service that requires a broadband resource device to perform video mode playback according to an embodiment of the present invention.
  • the broadband resource device in the IMR performs video playback and reception on the calling user, that is, the calling user.
  • the VP call service is carried out with the broadband resource device.
  • the calling user After obtaining the monitoring terminal number of the designated monitoring point by receiving the number, the calling user needs to see the video image of the designated monitoring point, that is, the calling object of the calling user is to be switched by the broadband resource device. To monitor the terminal, the VP call service is initiated between the calling user and the monitoring terminal.
  • the video interworking gateway device provided by the embodiment of the present invention is integrated in the IMR system.
  • the calling user calls a specific service code to connect to the IMR.
  • the video interworking gateway device in the IMR and the calling user perform parameter negotiation. After the negotiation succeeds, the calling user is connected to the broadband resource device, and the broadband resource device performs video mode on the calling user. Broadcasting, receiving, obtaining the monitoring terminal number; calling out to the monitoring terminal according to the monitoring terminal number IMR, after the monitoring terminal automatically picks up the answer, the video interworking gateway device and the monitoring terminal first perform parameter negotiation, and then the video interworking gateway device exchanges the calling party.
  • the negotiation parameter between the user and the monitoring terminal disconnecting the connection between the calling user and the broadband resource device Connected, and the circuit switching device bridges the narrowband circuit between the calling user and the monitoring terminal.
  • the calling user to perform online monitoring dials a specific service code, and initiates a VP call to the video interworking gateway device in the IMR;
  • the IMR returns a ringing tone to the calling user after receiving the VP call;
  • the IMR is sent to the calling user, indicating that the VP call is connected;
  • the video interworking gateway device and the calling user perform parameter negotiation, specifically: the video interworking gateway device and the calling user start H.245 negotiation, first perform capability exchange; then, the video interworking gateway device and the calling user perform main From negotiation;
  • the video interworking gateway device and the calling user exchange multiplex table, and the video interworking gateway device saves the multiplex table of the calling user for subsequent parameter exchange;
  • the video interworking gateway device and the calling user mutually send open logical channel messages, and the open audio logical channel message is generally one-way, and needs to be mutually sent, and the open video logical channel message is bidirectional, generally opened by the calling user, and received.
  • the video interworking gateway device records the media capability parameters and multiplexing parameters therein for use in subsequent parameter exchange.
  • the calling user and the video interworking gateway device negotiate successfully, and the video interworking gateway device connects the calling user to the broadband resource device in the IMR, and allocates a video interworking gateway resource for encoding and decoding operations during the connection process, so that the broadband resource device completes the master device.
  • Call the user video mode playback and prompt the calling user to enter the account number and password for authentication. After the authentication is passed, the calling user is prompted to input the monitoring point and other information to be accessed.
  • the receiving number is successfully obtained by the monitoring terminal number, the video in the IMR.
  • the interworking gateway device will initiate a VP call to the monitoring terminal.
  • the video interworking gateway device in the IMR initiates a VP call to the monitoring terminal;
  • S614-S615 the monitoring terminal returns a ringing tone to the IMR;
  • the monitoring terminal automatically answers, and sends a CONNECT connection message to the IMR to indicate that the VP call is received;
  • the video interworking gateway device and the monitoring terminal start H.245 negotiation, and firstly perform capability exchange.
  • the media capability of the terminal capability set sent by the video interworking gateway device is negotiated with the calling user, and the calling party uses The ability of the user to receive sounds and videos;
  • the video interworking gateway device performs master-slave negotiation with the monitoring terminal
  • the video interworking gateway device and the monitoring terminal mutually transmit a multiplexing table, and the multiplexing table of the monitoring terminal is saved, and subsequent parameter exchange is used;
  • the video interworking gateway device receives the audio and video open logical channel message sent by the monitoring terminal;
  • the video interworking gateway device exchanges the negotiation parameters of the calling user and the monitoring terminal, and disconnects the connection between the calling user and the broadband resource device;
  • the video interworking gateway device starts parameter exchange processing, and sends the saved multiplexing table of the calling user and the monitoring terminal to the calling party;
  • the video interworking gateway device sends a request to the calling user to close the video logical channel message, and requests the calling user to turn off the video logical channel that is opened for the calling user; the video interworking gateway device sends a closed audio logical channel message to the calling user to notify the calling party.
  • the audio logical channel opened by the user has been turned off; thus, the video interworking gateway device disconnects the connection between the calling user and the broadband resource device, and releases the broadband resource;
  • the video interworking gateway device sends an open audio logical channel message to the monitoring terminal, where the carried parameter is completely consistent with the saved open logical channel message of the calling user; the video interworking gateway device sends an open video logical channel message to the monitoring terminal, where The carried parameter is exactly the same as the saved video logical channel message of the saved calling user; the video interworking gateway device sends an open audio logical channel message to the calling user, and the carried parameter is completely consistent with the opened audio logical channel message of the saved monitoring terminal. In this way, the video interworking gateway completes the parameter exchange between the calling user and the monitoring terminal, and completes the secondary negotiation between the calling user and the monitoring terminal;
  • the circuit switching device switches the calling object of the calling user, and the narrowband circuit between the calling user and the monitoring terminal is connected by modifying the circuit, so that the calling user and the monitoring terminal directly perform the VP calling service through the narrowband circuit.
  • the present invention is applicable to 3G networks of various applications H.324 entities, including but not limited to current WCDMA, TD-SCDMA, and CDMA2000 networks.

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Description

视频互通网关设备、 视频呼叫业务的实现系统及方法
本申请要求于 2007 年 8 月 20 日提交中国专利局、 申请号为 200710138774.0、 发明名称为"视频互通网关设备、 视频呼出业务的实现系统 及方法 "的中国专利申请的优先权， 其全部内容通过引用结合在本申请中。 技术领域
本发明涉及通信系统， 尤其涉及一种实现视频呼叫业务的技术。
背景技术
第三代移动通信系统（The Third Generation, 3G )的基本网络结构由核心 网 （ Core Network, CN ) 、 无线接入网 ( Radio Access network, RAN )和用 户设备 ( User Equipment , UE )组成。 CN的主要功能是为 UE之间的通信进行 转交和寻址， CN被分为电路交换域（Circuit Switch, CS )和分组交换域（ Packet Switch, PS ) 。 CS域最大的特点是基于电路交换， 传输特性稳定， 具有低延时 和带宽保证， 能够给每个 UE提供 64K的带宽资源。
3G网络能够提供移动视频（Video Phone, VP )呼叫业务， 移动 VP呼叫业 务是通过 3G网络和 3G终端为用户传送视频内容的新型移动业务， 使用户在通 话时不仅可以互相听到声音， 还可以实时看到通话对方的视频图像。 在 R99和 R4版本的 3G网络中， 移动 VP呼叫业务与传统的语音业务相同， 釆用窄带电路 承载， 窄带电路承载是指通信数据在窄带电路上传输。 为了在窄带电路上实现 多媒体通信， 实时传输视频和语音， ITU-T制定了 H.324系列低速率多媒体互通 协议族， 专用于移动 VP呼叫业务， 包括 H.245协议 （ Control Protocol for Multimedia Communication, 多媒体通信控制协议） 、 H.223协议等。 H.245协 议规定了实现多媒体通信釆用的信令； H.223协议规定了实现多媒体通信的复 用方法， 多媒体通信的音频数据、 视频数据等通过特定的复用方法合成 H.223 复用流。 依据 H.324协议， 每个 3G终端可视作一个 H.324实体， 这些 H.324实体 釆用窄带电路承载， 即移动 VP呼叫业务在 3G网络中的 CS域开展。 H.324实体 将移动 VP呼叫业务涉及的符合 H.245协议的音频流、 视频流和控制流通过 H.223协议复用在带宽为 64kbit/s的窄带电路上。 以下移动 VP呼叫业务简称 VP 呼叫业务。
在 3G网络中， VP呼叫业务的流程可分为以下两个阶段： 第一阶段： 通过窄带 ISUP ( Integrated Services Digital Network User Part , 综合业务数字网络用户部分 )信令接通承载的窄带电路。
第二阶段： 依托于已接通的窄带电路， 进行通话双方 H.324实体间的参数 协商， 协商的内容包括通话时使用的符合 H.245协议的音视频编解码方式、 音 视频编解码釆用的符合 H.223协议的复用参数、 以及复用的音视频逻辑通道等 信参数， 协商成功后通话双方 H.324实体按协商参数互发音视频流， 开展 VP呼 叫业务。
在传统的 2G网络中， 在不断话的前提下， 用户通话对象的切换由电路交 换设备直接修改承载的窄带电路。 例如， 传统的 2G网络中的彩铃业务， 主叫 用户 A1发起到被叫用户 C1的呼叫，呼叫首先到移动交换中心（ Mobile Switching Center, MSC ) , MSC查询到被叫用户 CI注册了彩铃业务， 则 MSC将呼叫路 由到彩铃中心， 彩铃中心向被叫用户 C1发起呼叫， 在被叫用户 C1振铃后， 彩 铃中心向主叫用户 A1播放一段被叫用户 C1定制的音频彩铃， 此时 A1的通话对 象为彩铃中心负责播放音频彩铃的设备 B1 , 被叫用户 C1摘机应答后， 在不断 话的前提下， 由彩铃中心中的电路交换设备直接修改窄带电路搭接，将主叫用 户 A1的通话对象由设备 B1切换为被叫用户 C1 , 使主、 被叫用户 A1和 C1接通。
对于符合 H.324规范的 VP呼叫业务， 上述处理方式则存在一定问题。 例如 CS域 3G网络中， H.324实体 A2和 B2完成参数协商后开展 VP呼叫业务， 如果需 要在不断话的前提下， 将 A2的通话对象由 B2切换为另一个 H.324实体 C2 , 对 VP呼叫业务的第一阶段， 涉及的窄带电路修改与 2G网络中的实施过程相同， 由电路交换设备直接修改窄带电路搭接； 但对第二阶段涉及的 H.324实体间参 数协商则存在问题， 对于已经进行了一次协商， 处于正常通话状态的 A2来说， 通话对象突然由一个处在正常通话状态的 B2变为了一个处在初始状态的 C2, A2并不知道通话对方的变化， A2会认为 B2出现了异常， 导致 A2和 C2之间的 VP呼叫业务无法正常开展， 使呼叫拆除。
现有技术中利用视频互通网关 （ Video Interworking Gateway , VIG ) 实现 H.324实体与宽带资源设备之间的 VP呼叫业务。 VIG是能够提供视频互通网关 资源的物理实体，视频互通网关资源是体现视频互通网关功能的逻辑实体，一 个 VIG可以提供多个视频互通网关资源。 经过 VIG的 VP呼叫业务必然一端是 H.324实体， 一般釆用基于时分复用 （Time Division Mu pkmng, TDM )技术 的窄带电路承载；一端是宽带资源设备，一般釆用基于实时传输协议（ Real-time Transfer Protocol, RTP ) 的宽带 IP承载， 宽带 IP承载是指通信数据在宽带 IP网 络上传输。 利用 VIG实现 H.324实体与宽带资源设备之间的 VP呼叫业务， 实现 过程是 VIG与 H.324实体进行参数协商， 协商成功后连接 H.324实体到宽带资源 设备， 在 H.324实体与宽带资源设备开展 VP呼叫业务的过程中， VIG利用一个 视频互通网关资源进行两个异构网络之间繁重的媒体流编解码等工作。 但是， 如图 1所示， VIG支持的 VP呼叫业务， 一端为 CS域 3G网络中的 H.324实体， 另 一端为宽带资源设备， VIG无法对两个 H.324实体之间的 VP呼叫业务提供服务。 发明内容
本发明实施例提供了一种视频互通网关设备和 VP呼叫业务的实现系统及 方法，能够在不断话的前提下使主叫 H.324实体的通话对象由宽带资源设备切 换为被叫 H.324实体， 实现处理 H.324实体的通话对象发生变化的情况。
本发明实施例提供了一种视频互通网关设备， 包括：
宽带资源连接单元，用于连接需要宽带资源设备进行视频方式放音的视频 呼叫业务的主叫 H.324实体和所述宽带资源设备；
参数协商单元，用于和所述主叫 H.324实体进行参数协商，获取主叫 H.324 实体的协商参数，并在协商成功后通知所述宽带资源连接单元将主叫 H.324实 体连接到宽带资源设备上；以及和所述视频呼叫业务的被叫 H.324实体进行参 数协商， 获取被叫 H.324实体的协商参数；
参数存储单元，用于保存所述参数协商单元获取的主叫 H.324实体和被叫 H.324实体的协商参数；
参数交换单元， 用于将所述参数存储单元保存的主叫 H.324 实体、 被叫 H.324实体的协商参数分别发送给对方。
本发明实施例提供了一种视频呼叫业务的实现系统，包括视频互通网关设 备、 宽带资源设备和承载搭接设备， 其中：
所述视频互通网关设备和需要所述宽带资源设备进行视频方式放音的视 频呼叫业务的主叫 H.324实体进行参数协商，获取主叫 H.324实体的协商参数， 并在协商成功后将主叫 H.324实体连接到所述宽带资源设备上；
所述视频互通网关设备和所述视频呼叫业务的被叫 H.324 实体进行参数 协商， 获取被叫 H.324实体的协商参数， 并将主叫 H.324实体、 被叫 H.324实 体的协商参数分别发送给对方，断开主叫 H.324实体和宽带资源设备之间的连 接；
所述宽带资源设备， 用于对主叫 H.324实体进行视频方式的放音； 所述承载搭接设备，用于在所述视频互通网关设备断开主叫 H.324实体和 宽带资源设备之间的连接时，搭接主叫 H.324实体和被叫 H.324实体之间的承 载。
本发明实施例同时提供了一种视频呼叫业务的实现方法， 包括： 和需要宽带资源设备进行视频方式放音的视频呼叫业务的主叫 H.324 实 体进行参数协商， 获取主叫 H.324 实体的协商参数， 并在协商成功后将主叫 H.324实体连接到所述宽带资源设备上；
被叫用户应答后， 和所述视频呼叫业务的被叫 H.324实体进行参数协商， 获取被叫 H.324实体的协商参数；
将主叫 H.324实体、被叫 H.324实体的协商参数分别发送给对方， 断开主 叫 H.324实体和宽带资源设备之间的连接并搭接主叫 H.324实体和被叫 H.324 实体之间的 7 载。
本发明实施例提供的视频互通网关设备、 VP呼叫业务实现系统及方法， 利用视频互通网关设备与主叫 H.324实体进行参数协商， 协商成功后连接主叫 H.324实体到宽带资源设备， 实现对主叫 H.324实体视频方式的放音； 在不断话 的前提下把主叫 H.324实体的通话对象切换为被叫 H.324实体， 主叫 H.324实体 与被叫 H.324实体之间开展 VP呼叫业务， 解决了需要宽带资源设备进行视频方 式放音的视频呼叫业务中主叫 H.324实体的通话对象发生变化的情况， 保证了 各项视频呼叫业务的顺利开展。
在主叫 H.324实体、被叫 H.324实体交换协商参数后，通过搭接主叫 H.324 实体和被叫 H.324实体之间的承载在主、被叫 H.324实体之间直接开展视频呼 叫业务，释放了视频互通网关资源和宽带资源， 大大降低了对昂贵的视频互通 网关资源的依赖。 附图说明
图 1为现有技术中 VIG进行视频互通的示意图；
图 2为本发明实施例中 VP呼叫业务实现系统框图；
图 3为本发明实施例中 VP呼叫业务实现方法流程图；
图 4为本发明实施例中视频彩铃业务组网示意图；
图 5为本发明实施例中视频彩铃业务的处理流程图；
图 6为本发明另一实施例中在线监视业务的处理流程图。
具体实施方式
分析 3G网络中后续可实施的新业务， 基于 VP呼叫业务拓展出来的各种需 要视频方式放音、 可能还包括收号的 VP呼叫业务必定占据较大比例， 如视频 彩铃业务， 在线监视业务等。 视频方式放音就是向用户播放一段视频和语音， 视频方式收号就是用户根据视频和语音提示，按号码键反馈自己的选择。 这些
VP呼叫业务均有共同的场景模式： 主叫 H.324实体向 3G网络发起 VP呼叫业务， 3G网络连接主叫 H.324实体到负责视频方式放音、 收号的宽带资源设备， 由宽 带资源设备向主叫 H.324实体播放一段视频和语音、 可能还包括收号后， 主叫 H.324实体需要在不断话的前提下和具备视频能力的被叫 H.324实体开展 VP呼 叫业务。 整个 VP呼叫业务开展过程中， 主叫 H.324实体先和宽带资源设备开展 VP呼叫业务， 然后需要在不断话的前提下， 将主叫 H.324实体的通话对象由宽 带资源设备切换为被叫 H.324实体， 在主叫 H.324实体和被叫 H.324实体之间开 展 VP呼叫业务。 整个 VP呼叫业务中发生了通话对象的切换， 如果在通话对象 切换之前， 主叫 H.324实体和被叫 H.324实体之间不进行二次协商， 必然导致通 话的中断。 因此需要在主叫 H.324实体和被叫 H.324实体之间建立二次协商机 制， 以保证整个 VP呼叫业务的顺利开展。
二次协商问题的根本原因是整个 VP呼叫业务过程中发生了通话对象的切 换， 切换是由承载搭接设备执行的， 在 CS域 3G网络中， VP呼叫业务的多媒体 数据在窄带电路上传输， 即釆用窄带电路承载， 那么承载搭接设备为负责窄带 电路搭接的电路交换设备。 随着技术的不断发展， 如果主叫 H.324实体和被叫 H.324实体之间的 VP呼叫业务的多媒体数据在宽带 IP网络上传输， 即釆用宽带 IP承载， 承载搭接设备即为搭接主叫 H.324实体和被叫 H.324实体之间宽带 IP连 接的网络实体。
本发明实施例提供了一种 VP呼叫业务实现方案， 在承载搭接设备上集成 具备视频互通网关功能的视频互通网关设备， 下面对 VP呼叫业务的实现方案 进行简单描述：
当主叫 H.324实体呼入时，视频互通网关设备与主叫 H.324实体进行参数协 商， 协商成功后视频互通网关设备连接主叫 H.324实体到宽带资源设备， 由宽 带资源设备完成对主叫 H.324实体视频方式的放音、 可能还包括收号， 连接过 程中由视频互通网关设备利用一个视频互通网关资源进行繁重的媒体流编解 码等工作， 这是主叫 H.324实体与宽带资源设备之间开展 VP呼叫业务的过程。
当需要切断宽带资源设备对主叫 H.324实体视频方式的放音， 连接主叫
H.324实体到被叫 H.324实体时，先由视频互通网关设备呼出到被叫 H.324实体， 与被叫 H.324实体进行参数协商； 然后视频互通网关设备在主、被叫 H.324实体 之间交换协商参数， 进一步视频互通网关设备还可以对比主、 被叫 H.324实体 的协商参数， 确认协商参数不一致后， 交换主、 被叫 H.324实体之间的协商参 数； 在完成协商参数的交换后， 主叫 H.324实体、 被叫 H.324实体互相了解对方 的协商参数， 断开主叫 H.324实体与宽带资源设备之间的连接， 并由承载搭接 设备进行主叫 H.324实体、 被叫 H.324实体之间承载的搭接， 主、 被叫 H.324实 体依托接通的承载直接开展 VP呼叫业务， 此处的承载包括窄带电路承载和宽 带 IP承载。
如图 2所示， 本发明实施例提供了一种视频互通网关设备 21 , 包括： 宽带资源连接单元 211 , 用于连接需要宽带资源设备进行视频方式放音的 VP呼叫业务的主叫 H.324实体和所述宽带资源设备；
参数协商单元 212, 用于和所述主叫 H.324实体进行参数协商， 获取主叫 H.324实体的协商参数， 并在协商成功后通知所述宽带资源连接单元 211将主 叫 H.324实体连接到宽带资源设备上； 以及和所述 VP呼叫业务的被叫 H.324 实体进行参数协商， 获取被叫 H.324实体的协商参数；
参数存储单元 213, 用于保存所述参数协商单元 212获取的主叫 H.324实 体和被叫 H.324实体的协商参数；
参数交换单元 214,用于将所述参数存储单元 213保存的主叫 H.324实体、 被叫 H.324实体的协商参数分别发送给对方。
如果主、被叫 H.324实体的协商参数相同， 参数交换单元 214进行的参数 交换工作就不是必须的， 所述视频互通网关设备 21还包括：
参数比较单元 215,用于比较所述参数存储单元 213保存的主、被叫 H.324 实体的协商参数，在确认双方的协商参数不相同时触发参数交换单元 214进行 参数交换。
基于本发明实施例提供的视频互通网关设备，同时提供了一种视频呼叫业 务实现系统，包括视频互通网关设备 21、宽带资源设备 22和承载搭接设备 23, 其中：
所述视频互通网关设备 21 和需要宽带资源设备 22进行视频方式放音的
VP呼叫业务的主叫 H.324实体进行参数协商， 获取主叫 H.324实体的协商参 数， 并在协商成功后将主叫 H.324实体连接到所述宽带资源设备 22上；
所述视频互通网关设备 21和所述 VP呼叫业务的被叫 H.324实体进行参 数协商， 获取被叫 H.324实体的协商参数， 并将主叫 H.324实体、 被叫 H.324 实体的协商参数分别发送给对方， 断开主叫 H.324实体和宽带资源设备 22之 间的连接；
所述宽带资源设备 22, 用于对主叫 H.324实体进行视频方式的放音； 所述承载搭接设备 23 , 用于在视频互通网关设备 21断开主叫 H.324实体和 宽带资源设备 22之间的连接时搭接主叫 H.324实体和被叫 H.324实体之间的承 载。
所述承载搭接设备 23包括电路交换设备。
所述被叫 H.324实体包括具备视频能力的 3G终端和支持 H.324互通的网 络设备， 例如视频互通网关 VIG, 用于视频会议的 MCU等。
本发明实施例还提供一种 VP呼叫业务实现方法， 如图 3所示， 包括以下步 骤：
5301、和需要宽带资源设备进行视频方式放音的 VP呼叫业务的主叫 H.324 实体进行参数协商， 获取主叫 H.324实体的协商参数， 并在协商正常完成后将 主叫 H.324实体连接到所述宽带资源设备上；
5302、 被叫用户应答后， 和所述 VP呼叫业务的被叫 H.324实体进行参数协 商， 获取被叫 H.324实体的协商参数；
S303、 将主叫 H.324实体、 被叫 H.324实体的协商参数分别发送给对方， 断 开主叫 H.324实体和宽带资源设备之间的连接， 并搭接主叫 H.324实体和被叫 H.324实体之间的承载。
所述方法还可以包括步骤：
在将主叫 H.324实体、被叫 H.324实体的协商参数分别发送给对方之前， 确 认主叫 H.324实体和被叫 H.324实体的协商参数不一致。
本发明实施例提供了一种 VP呼叫业务的实现系统及方法， 用以处理开展 VP呼叫业务时 H.324实体的通话对象发生变化的情况，以保证各项 VP呼叫业务 的顺利开展；
本发明实施例提供的方案需要借助视频互通网关的功能，但力求对视频互 通网关资源的依赖降到最低， 在主、 被叫 H.324实体完成参数交换实现二次协 商后， 通过搭接主叫 H.324实体和被叫 H.324实体之间的承载在主、 被叫 H.324 实体之间直接开展视频呼叫业务，释放视频互通网关资源和宽带资源； 整个业 务过程中， 对视频互通网关资源的占用主要在连接主叫 H.324实体到宽带资源 设备的阶段， 这个阶段也只需要一个视频互通网关资源， 并且这个阶段相对整 个 VP呼叫业务的持续时间， 一般都只占据较小的比例， 所以使用本方案将大 大降低相应 VP呼叫业务对视频互通网关资源的依赖。 行具体的说明。
实施例一
WCDMA 网络中的视频彩铃业务为需要宽带资源设备进行视频方式放音 的 VP呼叫业务在 CS域 3G网络中的一个具体实施例。 WCDMA网络中视频 彩铃业务组网示意图如图 4 所示， 涉及的网络实体包括移动交换中心服务器 ( MSC Server ), 媒体网关 （Multimedia Gateway, MGW ), 多媒体彩铃中心 ( Multimedia Ring Back Tone , MRBT ), 位置归属寄存器 （Home Location Register, HLR )。 MRBT用于处理视频彩铃业务，是本实施例的具体应用平台。 MRBT中包括电路交换设备和具备宽带资源能力的 IP资源设备。 电路交换设 备即为承载搭接设备， IP 资源设备即为宽带资源设备， 主叫用户和被叫用户 使用的 3G终端都是 H.324实体， 且被叫用户注册了视频彩铃业务。 视频彩铃业务的呼叫流程是： 主叫用户发起到被叫用户的 VP呼叫， 主叫 用户发起的 VP呼叫首先到 WCDMA网络，网络中的 MSC收到呼叫则向 HLR 查询被叫用户是否注册了视频彩铃业务，当查询到被叫用户注册了视频彩铃业 务， 则 MSC将呼叫路由到 MRBT , MRBT分析后向被叫用户发起 VP呼叫， 在被叫用户振铃后， MRBT向主叫用户播放一段被叫用户定制的视频彩铃；被 叫用户摘机应答后， MRBT将主、 被叫用户接通。 显然， 这个业务场景是本发 明实施例涉及的需要宽带资源设备进行视频方式放音的 VP呼叫业务， 为了向 主叫用户播放视频彩铃， MRBT中具备宽带资源能力的 IP资源设备先向主叫 用户进行视频方式的放音， 即主叫用户与 IP资源设备之间开展 VP呼叫业务； 当被叫用户摘机应答后， 主叫用户的通话对象要切换为被叫用户， 主叫用户与 被叫用户之间开展 VP呼叫业务。
为了实现视频彩铃业务的正常开展， 在 MRBT 系统中集成本发明实施例 提供的视频互通网关设备， MRBT通过视频互通网关设备与主叫用户进行参数 协商， 协商成功后连接主叫用户到 IP资源设备， 由 IP资源设备对主叫用户播 放视频彩铃； 当被叫用户摘机应答后，视频互通网关设备与被叫用户进行参数 协商， 并交换主、 被叫用户的协商参数， 断开主叫 H.324实体和宽带资源设备 之间的连接， 并由电路交换设备搭接主、 被叫用户之间的窄带电路承载。
视频彩铃业务的处理流程如图 5所示， 其中实线消息为呼叫控制相关的 Q931、 isup等消息， 单点双线为视频互通网关设备与主叫用户进行参数协商的 H.245消息， 双点单线为视频互通网关设备与被叫用户进行参数协商的 H.245 消息， 视频彩铃业务的处理流程包括以下步骤：
S501-S506 , 主叫用户发起到被叫用户的 VP呼叫， 主叫用户发起的 VP呼 叫首先到 WCDMA网络， 主叫侧移动交换中心服务器 0— MSC向 HLR发送路由 消息， HLR接收到路由消息， 则要求被叫侧移动交换中心服务器 T—MSC提供 被叫用户的漫游号码， HLR获取被叫用户的漫游号码后发现其注册了视频彩铃 业务， 通知 0— MSC将主叫用户发起的 VP呼叫路由到 MRBT；
S507-S509 , MRBT中的视频互通网关设备根据被叫用户的漫游号码向 T— MSC发起 VP呼叫； S510-S513 , T— MSC收到被叫用户发送的振铃信号后， MRBT将该信号透 传到主叫侧；
S514-S515, MRBT收到放音命令， 则下发连接到主叫用户， 准备接通话 路， 对主叫用户进行视频方式的放音；
S516-S519, 视频互通网关设备与主叫用户开始进行参数协商， 具体为： 视频互通网关设备与主叫用户开始 H.245协商， 首先进行能力交换， 为保 证主叫用户打开逻辑通道所选用的媒体格式是一般用户广泛釆用并支持的 ,视 频互通网关设备发出的终端能力集（ Terminal Capability Set, TCS ) 中带有的 媒体能力应该是 3G网络中最常用的， 如视频用 H263 , 音频用 AMR;
接着，视频互通网关设备与主叫用户进行主从协商， 主从协商是一个可选 的部分， 作用是确定通话双方中的一端为主控方， 一端为从属方， 以便在进行 某些特殊的操作时避免发生冲突，例如打开视频逻辑通道，一般由主控方打开， 如果双方都发送了这个操作， 可能就会发生冲突；
然后，视频互通网关设备与主叫用户互发复用表，视频互通网关设备将主 叫用户的复用表保存起来， 供后续参数交换使用， 互发复用表就是两个 H.324 实体将本方的 H.223复用流的构成告知对方， 包括具体的逻辑通道， 如音频逻 辑通道、 视频逻辑通道等， 以及是否有通道嵌套等， 即告知通话对方怎样从 H.223复用流中分解出各逻辑通道中的数据；
最后， 视频互通网关设备与主叫用户互发打开逻辑通道（Open Logical Channel, OLC ) 消息， 发送打开逻辑通道消息用来告知对方要开始发送音频 或视频数据， 请对方准备接收， 打开音频逻辑通道消息一般是单向的， 需要互 发， 而打开视频逻辑通道消息是双向的， 一般由主叫用户打开， 收到主叫用户 发送的音频和视频两个打开逻辑通道消息后，视频互通网关设备保存其中的媒 体能力参数和复用参数， 供后续参数交换时使用；
至此， 主叫用户与视频互通网关设备协商成功，视频互通网关设备连接主 叫用户到 IP资源设备， IP资源设备向主叫用户播放一段被叫用户定制的视频彩 铃， IP资源设备向主叫用户播放视频彩铃的过程中， 视频互通网关设备利用一 个视频互通网关资源进行繁重的编解码操作；同时主叫用户等待被叫用户摘机 应答。 S520-S521 , 被叫用户摘机应答， MRBT中的视频互通网关设备收到被叫 用户摘机应答消息， 则下发连接到被叫用户；
S522-S525 , 被叫用户摘机应答后， 视频互通网关设备与被叫用户开始进 行参数协商， 具体为：
视频互通网关设备与被叫用户开始 H.245协商， 首先进行能力交换， 视频 互通网关设备发出的终端能力集带有的媒体能力是与主叫用户协商后，主叫用 户接收音、 视频时使用的能力；
接着， 视频互通网关设备与被叫用户进行主从协商；
然后， 视频互通网关设备与被叫用户互发复用表， 将被叫用户与本次 VP 呼叫业务相关的复用表保存起来，供后续参数交换使用，保存的复用表在本次 VP呼叫业务结束时被一并释放；
最后 ,视频互通网关设备收到被叫用户发送的音频和视频两个打开逻辑通 道消息；
S526-S531 , 视频互通网关设备交换主叫用户和被叫用户的协商参数， 断 开主叫用户与宽带资源设备之间的连接；
首先，视频互通网关设备将保存的主叫用户和被叫用户的复用表发送给通 话对方；
然后，视频互通网关设备对主叫用户发送请求关闭视频逻辑通道（ Request Channel Close, RCC )消息， 请求主叫用户关掉对其打开的视频逻辑通道； 视 频互通网关设备对主叫用户发送关闭音频逻辑通道（Close Logical Channel, CLC )消息， 通知主叫用户之前对其打开的音频逻辑通道已经关闭； 这样视频 互通网关设备就断开了主叫用户与宽带资源设备之间的连接， 释放了宽带资 源；
最后，视频互通网关设备对被叫用户发送打开音频逻辑通道消息， 其中携 带的参数与保存的主叫用户的打开音频逻辑通道消息完全一致；视频互通网关 设备对被叫用户发送打开视频逻辑通道消息，其中携带的参数与保存的主叫用 户的打开视频逻辑通道消息完全一致；视频互通网关设备对主叫用户发送打开 音频逻辑通道消息，其中携带的参数与保存的被叫用户的打开音频逻辑通道消 息完全一致； 这样，视频互通网关设备就完成了主叫用户与被叫用户之间的参 数交换， 实现了主叫用户与被叫用户之间的二次协商；
S532、电路交换设备切换主叫用户的通话对象，通过修改电路承载接通主、 被叫用户之间的窄带电路， 使主、 被叫用户直接通过窄带电路开展 VP呼叫业 务。
实施例二
在线监视业务为需要宽带资源设备进行视频方式放音的 VP呼叫业务的又 一 CS域 3G网络中的具体实施例。 在线监视业务的具体应用平台为在线监视 业务平台 （IMR ), IMR中具备电路交换设备和与用户开展视频方式放音、 收 号所用到的宽带资源设备； 需要进行在线监视业务的主叫用户使用的 3G终端 是 H.324实体； 主叫用户在需要进行监视的地点自行安装监视终端，监视终端 与普通 3G终端基本一致， 仅进行简单改造如自动接通、 防水、 加固等即可， 每个监视终端都有一个呼叫受控的号码， 监视终端也是 H.324实体。
在线监视业务的实现流程是： 主叫用户使用在线监视业务时，先呼叫特定 业务码， 连接到 IMR, IMR通过视频方式的放音、 收号对主叫用户进行鉴权， 并获得主叫用户指定监视点的监视终端号码； 在得到监视终端号码后， IMR 连接主叫用户到监视终端， 使主叫用户可以看到监视点的视频图像。 显然， 这 个业务场景是本发明实施例涉及的需要宽带资源设备进行视频方式放音的 VP 呼叫业务， IMR 中的宽带资源设备对主叫用户进行视频方式的放音、 收号， 即主叫用户与宽带资源设备之间开展 VP呼叫业务； 通过收号获得指定监视点 的监视终端号码后， 主叫用户要看到指定监视点的视频图像， 即主叫用户的通 话对象要由宽带资源设备切换为监视终端， 主叫用户与监视终端之间开展 VP 呼叫业务。
为了实现在线监视业务的正常开展， 在 IMR系统中集成本发明实施例提 供的视频互通网关设备。 主叫用户呼叫特定业务码连接到 IMR, IMR中的视 频互通网关设备与主叫用户进行参数协商，协商成功后连接主叫用户到宽带资 源设备， 由宽带资源设备对主叫用户进行视频方式的放音、 收号， 获得监视终 端号码； 根据监视终端号码 IMR呼出到监视终端， 监视终端自动摘机应答后， 首先由视频互通网关设备与监视终端进行参数协商，然后视频互通网关设备交 换主叫用户与监视终端的协商参数， 断开主叫用户与宽带资源设备之间的连 接， 并由电路交换设备搭接主叫用户与监视终端之间的窄带电路承载。
在线监视业务的处理流程如图 6所示， 包括以下步骤：
S601-S602, 要进行在线监视的主叫用户拨特定业务码， 向 IMR中的视频 互通网关设备发起一个 VP呼叫；
S603-S604, IMR收到 VP呼叫后向主叫用户返回振铃；
S605-S606, IMR下发连接到主叫用户， 指示接通 VP呼叫；
S607-S610, 视频互通网关设备与主叫用户进行参数协商， 具体为： 视频互通网关设备与主叫用户开始 H.245协商， 首先进行能力交换； 接着， 视频互通网关设备与主叫用户进行主从协商；
然后，视频互通网关设备与主叫用户互发复用表，视频互通网关设备将主 叫用户的复用表保存起来， 供后续参数交换使用；
最后，视频互通网关设备与主叫用户互发打开逻辑通道消息，打开音频逻 辑通道消息一般是单向的， 需要互发， 而打开视频逻辑通道消息是双向的， 一 般由主叫用户打开， 收到主叫用户发送的音频和视频逻辑通道消息后，视频互 通网关设备记录其中的媒体能力参数和复用参数， 供后续参数交换时使用。
至此， 主叫用户与视频互通网关设备协商成功，视频互通网关设备连接主 叫用户到 IMR中的宽带资源设备，连接过程中分配一个视频互通网关资源进行 编解码操作，使宽带资源设备完成对主叫用户视频方式的放音， 并提示主叫用 户输入帐号、 密码进行鉴权，鉴权通过后提示主叫用户输入需要访问的监视点 等信息， 收号成功得到监视终端号码， IMR中的视频互通网关设备将发起到监 视终端的 VP呼叫。
S611-S613 , IMR中的视频互通网关设备发起到监视终端的 VP呼叫； S614-S615 , 监视终端向 IMR回送振铃；
S616-S617 , 监视终端自动应答， 向 IMR回送 CONNECT连接消息指示接 通 VP呼叫；
S618-S621 , 监视终端自动应答后， 视频互通网关设备与监视终端开始进 行参数协商， 具体为：
视频互通网关设备与监视终端开始 H.245协商， 首先进行能力交换， 视频 互通网关设备发出的终端能力集带有的媒体能力是与主叫用户协商后，主叫用 户接收音、 视频时使用的能力；
接着， 视频互通网关设备与监视终端进行主从协商；
然后，视频互通网关设备与监视终端互发复用表，保存监视终端的复用表， 后续参数交换使用；
最后，视频互通网关设备收到监视终端的发送的音频和视频打开逻辑通道 消息；
S622-S627 , 视频互通网关设备交换主叫用户和监视终端的协商参数， 断 开主叫用户与宽带资源设备之间的连接；
首先，视频互通网关设备开始参数交换处理，将保存的主叫用户和监视终 端的复用表发送给通话对方；
然后，视频互通网关设备对主叫用户发送请求关闭视频逻辑通道消息，请 求主叫用户关掉对其打开的视频逻辑通道；视频互通网关设备对主叫用户发送 关闭音频逻辑通道消息， 通知主叫用户之前对其打开的音频逻辑通道已经关 闭； 这样视频互通网关设备就断开了主叫用户与宽带资源设备之间的连接，释 放了宽带资源；
最后，视频互通网关设备对监视终端发送打开音频逻辑通道消息， 其中携 带的参数与保存的主叫用户的打开音频逻辑通道消息完全一致；视频互通网关 设备对监视终端发送打开视频逻辑通道消息，其中携带的参数与保存的主叫用 户的打开视频逻辑通道消息完全一致；视频互通网关设备对主叫用户发送打开 音频逻辑通道消息，其中携带的参数与保存的监视终端的打开音频逻辑通道消 息完全一致； 这样，视频互通网关就完成了主叫用户与监视终端之间的参数交 换， 完成了主叫用户与监视终端之间的二次协商；
S628、 电路交换设备切换主叫用户的通话对象，通过修改电路承载接通主 叫用户与监视终端之间的窄带电路，使主叫用户与监视终端直接通过窄带电路 开展 VP呼叫业务。
本发明适用于各种应用 H.324实体的 3G网络， 所述 3G网络包括但不限 于目前的 WCDMA、 TD-SCDMA和 CDMA2000网络等。
通过以上的实施方式的描述，本领域的技术人员可以清楚地了解到本发明 可借助软件加必需的通用硬件平台的方式来实现， 当然也可以通过硬件，但很 多情况下前者是更佳的实施方式。基于这样的理解， 本发明的技术方案本质上 或者说对背景技术做出贡献的部分可以以软件产品的形式体现出来，该计算机 软件产品可以存储在可读取的存储介质中， 如 ROM/RAM、 磁碟、 光盘等， 包 括若干指令用以使得一台计算机设备（可以是个人计算机， 服务器， 或者网络 设备等）执行本发明各个实施例或者实施例的某些部分所述的方法。 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。

Claims

权 利 要 求
1、 一种视频互通网关设备， 其特征在于， 包括：
宽带资源连接单元，用于连接需要宽带资源设备进行视频方式放音的视频 呼叫业务的主叫 H.324实体和所述宽带资源设备；
参数协商单元，用于和所述主叫 H.324实体进行参数协商，获取主叫 H.324 实体的协商参数，并在协商成功后通知所述宽带资源连接单元将主叫 H.324实 体连接到宽带资源设备上；以及和所述视频呼叫业务的被叫 H.324实体进行参 数协商， 获取被叫 H.324实体的协商参数；
参数存储单元，用于保存所述参数协商单元获取的主叫 H.324实体和被叫 H.324实体的协商参数；
参数交换单元， 用于将所述参数存储单元保存的主叫 H.324 实体、 被叫 H.324实体的协商参数分别发送给对方。
2、 如权利要求 1所述的视频互通网关设备， 其特征在于， 还包括： 参数比较单元， 用于比较所述参数存储单元保存的主、被叫 H.324实体的 协商参数，在确认双方的协商参数不相同时触发所述参数交换单元进行协商参 数的交换。
3、 一种视频呼叫业务的实现系统， 其特征在于， 包括： 视频互通网关设 备、 宽带资源设备和承载搭接设备， 其中：
所述视频互通网关设备和需要所述宽带资源设备进行视频方式放音的视 频呼叫业务的主叫 H.324实体进行参数协商，获取主叫 H.324实体的协商参数， 并在协商成功后将主叫 H.324实体连接到所述宽带资源设备上；
所述视频互通网关设备和所述视频呼叫业务的被叫 H.324 实体进行参数 协商， 获取被叫 H.324实体的协商参数， 并将主叫 H.324实体、 被叫 H.324实 体的协商参数分别发送给对方，断开主叫 H.324实体和宽带资源设备之间的连 接；
所述宽带资源设备， 用于对主叫 H.324实体进行视频方式的放音； 所述承载搭接设备，用于在所述视频互通网关设备断开主叫 H.324实体和 宽带资源设备之间的连接时，搭接主叫 H.324实体和被叫 H.324实体之间的承 载。
4、 如权利要求 3所述的系统， 其特征在于， 所述视频互通网关设备在确 认主叫 H.324实体和被叫 H.324实体的协商参数不相同后，将主叫 H.324实体、 被叫 H.324实体的协商参数分别发送给对方。
5、 如权利要求 3所述的系统， 其特征在于， 所述承载搭接设备包括电路 交换设备。
6、 如权利要求 3所述的系统， 其特征在于， 所述被叫 H.324实体包括： 具 备视频能力的 3G终端和支持 H.324互通的网络设备。
7、 一种视频呼叫业务的实现方法， 其特征在于， 包括：
和需要宽带资源设备进行视频方式放音的视频呼叫业务的主叫 H.324 实 体进行参数协商， 获取主叫 H.324实体的协商参数， 并在协商正常完成后将主 叫 H.324实体连接到所述宽带资源设备上；
被叫用户应答后， 和所述视频呼叫业务的被叫 H.324实体进行参数协商， 获取被叫 H.324实体的协商参数；
将主叫 H.324实体、被叫 H.324实体的协商参数分别发送给对方， 断开主 叫 H.324实体和宽带资源设备之间的连接并搭接主叫 H.324实体和被叫 H.324 实体之间的 7 载。
8、 如权利要求 7所述的方法， 其特征在于， 所述将主叫 H.324实体、 被叫 H.324实体的协商参数分别发送给对方之前，还包括： 确认主叫 H.324实体和被 叫 H.324实体的协商参数不相同。
9、 如权利要求 7 所述的方法， 其特征在于， 所述协商参数包括： H.324 实体的 H.245音频、 视频媒体能力参数和 H.223复用参数。
10、 如权利要求 7所述的方法， 其特征在于， 所述需要宽带资源设备进行 视频方式放音的视频呼叫业务包括： 视频彩铃业务和在线监视业务。
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EP2114049A4 (en) 2010-11-24
KR20090109118A (ko) 2009-10-19
EP2114049B1 (en) 2014-01-22
CN101374330A (zh) 2009-02-25
US8560717B2 (en) 2013-10-15
KR101074888B1 (ko) 2011-10-19

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