CN101772077B - Method, device and video conference system for transmitting real-time media stream data - Google Patents
Method, device and video conference system for transmitting real-time media stream data Download PDFInfo
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Abstract
The invention relates to a method and video conference system for transmitting real-time media stream data. The method comprises the following steps: receiving a transmission request of real-time media stream data from a terminal; encapsulating various protocol data contained in the request to obtain packet switch data packet which is loaded by mobile network; and using mobile network to transmit the switch data packet to a core network device so that the core network device transmits the decapsulated real-time media stream data to a target side terminal through IP network. Therefore, the method, device and system of the invention can be used to realize the effective transmission of mobile real-time media stream data; and the mobile network is adopted for transmission so as to ensure the broad bandwidth demand on the transmission of mobile real-time media stream data, and the existing terminal is not needed to modify and update, thus effectively controlling the cost.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of method and video conferencing system of transmitting real-time media stream data.
Background technology
Along with the development of the communication technology, people are also more and more higher for the transmission requirement of various data services, especially relate to the transmission of real-time media stream data, such as video conference, videoconference etc.; But, present existing real-time media stream data transmission mainly is by GSTN(General SwitchedTelephone Network, public switched telephone network (PSTN)) realizes, and along with more and more to the demand of real-time media stream data transmission, also more and more stronger for the transmission demand of in movement, carrying out real-time media stream whenever and wherever possible; And possible a kind of scheme that solves mobile real-time media stream data transmission is with the transmission system of mobile communication network access based on fixed-line phone network, with satisfy mobile in for the transmission requirement of real-time media stream data; But mobile network is not identical at aspects such as host-host protocols with fixed-line phone network, be transmitted as example with videoconferencing service: existing fixed telephone network video-signal system mainly carries based on IP, adopt H.323 agreement, and the 3G videoconferencing service is mainly based on circuit domain TDM(time division multiplexing, time division multiplexing) carrying, the H.324 agreement of employing; Therefore in order to carry out mobile real-time media stream data transmission, control signal intercommunication between two nets need to be finished between mobile network and the fixed-line phone network; Take traditional video communication service system as example, as shown in Figure 1:
In this scheme, H.324 protocol conversion gateway is responsible for realizing intercommunication, media stream transition and video, the audio coding decoding intercommunication conversion of control signal between two nets, and communicate conversion between the system and between the communication protocol, comprise IP network and SCN(Switched Circuit Network, Circuit Switching Network) call setup and cancel etc.; MC(Multipoint Controller, multipoint controller) control between a plurality of members that participate in multipoint conference is provided, MC provides the capability negotiation with all terminal rooms, and Common Capability Set is provided, and is in charge of conferencing resource; MP(Multipoint Processor, multipoint processor) focusing on of audio frequency and video etc. is provided, MC and MP are collectively referred to as MCU(Multipoint Control Unit, multipoint control unit); GK(Gatekeeper, gatekeeper) provides address translation, process the scheduling etc. of access control, Bandwidth Management and the conferencing resource of network;
H.324 protocol conversion gateway connects by gatekeeper's H.323 RAS agreement and video terminal H.323, call out control by agreement Q.931, set up the multimedia call passage by system's control protocol H.245, by RSVP, RTP/RTSP carries out the real-time media stream data transmission; Call out take video terminal H.324 that H.323 video terminal is as example, the calling basic procedure of Integrated Video Communications Service is as follows:
(1) H.324 video terminal is called out H.323 video terminal by behind the 3G Access Network accessing mobile communication network; (2) H.324 packet through circuit domain MGW(Media Gate Way, media gateway) and public switched telephone network (PSTN) PSTN enter IP network; Before entering IP network, H.324 protocol conversion gateway will be H.324 protocol data be converted to H.323 protocol data so that data can be on IP network normal transmission; (3) H.324 protocol conversion gateway is accessed H.323 gatekeeper, obtains called I P address, and connects with called H.323 video terminal; (4) video terminal and H.323 set up the multimedia call passage between the video terminal H.324 carries out the real-time media stream data transmission; Like this, just can realize supporting 3G video terminal, the multipoint conference of video terminal H.323 by H.324 protocol conversion gateway and MCU, reach the effect of mobile video session.
But, above-mentionedly realize real-time media stream data when transmission by protocol conversion gateway, very high to the Capability Requirement of video terminal; Example traditional video communication service system described above just requires to support the H.324 terminal of video traffic need to support image capturing functionality, audio/video encoding/decoding function, this must make the production cost of new terminal rise, and adopt this scheme to need this expensive terminal, increased the construction cost of whole system; Simultaneously, when realizing the transmission of mobile real-time media stream based on fixed-line phone network, mainly be by circuit domain (CS territory) the transmission of data, and the bearing capacity in CS territory very limited only be 64kbps, but this transmission rate can not provide smooth video effect.
Summary of the invention
In view of this, what the embodiment of the invention solved is the problem of mobile real-time media stream data transmission, method and the video conferencing system of a kind of transmitting real-time media stream data that provides by the embodiment of the invention, effective transmission that can mobile real-time media stream data, guaranteed the high broadband requirement of mobile real-time media stream data transmission, and can effectively control cost.
For addressing the above problem, the technical scheme that the embodiment of the invention provides is as follows:
A kind of method of transmitting real-time media stream data comprises:
The real-time media stream data transmission request that receiving terminal is initiated;
The block domain data bag that becomes the mobile network to carry the variety of protocol data encapsulation that comprises in the request;
Via the mobile network described block domain data bag is transferred to equipment of the core network, finish transmission so that the real-time media stream data of described equipment of the core network after with decapsulation sends to the target side terminal by IP network.
Preferably, described block domain data bag transferred to equipment of the core network and send to the target side terminal after decapsulation specifically comprise:
Described block domain data bag is transferred to SGSN in the described core net, SGSN and GGSN sets up secure tunnel and the block domain data bag encapsulated again after be forwarded to GGSN in the core net by SGSN;
Described GGSN carries out decapsulation to the packet that receives from SGSN, obtains the target ip address of described real-time media stream data, according to this target ip address described data communication device is crossed IP network and is sent to target terminal.
Preferably, corresponding initiating terminal and the target terminal of the described real-time media stream data transmission request that receives is the terminal of supporting same protocol.
Preferably, described terminal is video terminal H.323, and described real-time media stream data transmission request is that H.323 video conference request, described real-time media stream data are to support the H.323 video data of agreement.
Preferably, described mobile network is the 3G Access Network.
A kind of video conferencing system comprises video terminal, also comprises: transmitting device, SGSN and GGSN; Wherein, described video terminal is used for initiating the video conference request and receiving the video data that other video terminals transmit;
Described transmitting device is used for receiving the video conference request that described video terminal is initiated, and after the video data of support the first agreement that will comprise is packaged into the block domain data bag of mobile network carrying, described block domain data bag is sent to SGSN by the mobile network in will asking;
Described SGSN is used for receiving the block domain data bag that described transmitting device sends over by the mobile network, and is transmitted to described GGSN after it is encapsulated;
Described GGSN is used for carrying out decapsulation to receiving packet, and obtains the IP address of described packet, according to described IP address described video data is sent to the target video terminal by IP network again.
Preferably, described transmitting device comprises: receiver module, package module and sending module; Wherein,
Described receiver module is used for the video conference request that the receiver, video terminal is initiated;
Described package module is packaged into the block domain data bag of mobile network's carrying for the video data of support the first agreement that described video conference request is comprised;
Described sending module is used for described block domain data bag is sent to SGSN by the mobile network.
Preferably, described transmitting device also comprises: the unit of upgrading is used for receiving outside instruction and carries out agreement upgrading or renewal, and notifies described package module to adopt new agreement to carry out data encapsulation.
Preferably, described video terminal is connected by wired and/or wireless mode with described transmitting device.
Preferably, described mobile network is the 3G Access Network.
Preferably, described video terminal is video terminal H.323, and described the first agreement is agreement H.323.
Can find out, adopt method and the video conferencing system of the embodiment of the invention, by mobile real-time media stream data being encapsulated as the block domain data of mobile network's carrying, by mobile network and IP network described mobile real-time media stream data is sent to target terminal, thereby is realizing effective transmission of mobile real-time media stream data; Owing to having adopted the mobile network to transmit, guaranteed the high broadband requirement of mobile real-time media stream data transmission, and need not existing terminal is transformed and upgraded, thereby can effectively control cost.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is video communication service system network architecture schematic diagram traditional in the prior art;
Fig. 2 is the method flow schematic diagram of the embodiment of the invention 1;
Fig. 3 is the apparatus structure schematic diagram of the embodiment of the invention 2;
Fig. 4 is the grid framework schematic diagram of the embodiment of the invention 3.
Embodiment
The basic thought of the embodiment of the invention is by mobile real-time media stream data being encapsulated as the block domain data of mobile network's carrying, by mobile network and IP network described mobile real-time media stream data is sent to target terminal, thereby is realizing effective transmission of mobile real-time media stream data; Owing to having adopted the mobile network to transmit, guaranteed the high broadband requirement of mobile real-time media stream data transmission, and need not existing terminal is transformed and upgraded, thereby can effectively control cost.
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is clearly and completely described; Obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Fig. 2 shows the method for a kind of transmitting real-time media stream data of the embodiment of the invention 1, and it is mainly used in the mobile real-time media stream data transmission system, and the method comprises:
Step 201: the real-time media stream data transmission request that receiving terminal is initiated;
The terminal of initiating in the specific implementation the real-time media stream data transmission is supported the terminal of same protocol, for example H.323 video terminal in the video-signal system often; And the transmission of real-time media stream data wherein request is that H.323 video conference request, described real-time media stream data are to support the H.323 video data of agreement accordingly; When terminal will be carried out the real-time media stream data transmission, can initiate real-time media stream data transmission request, can receive by wired or wireless mode this transmission request this moment; For example, the real-time media stream data transmission that comes receiving terminal to initiate by standards such as netting twine (RJ-45) or 802.11.
Step 202: the block domain data bag that the variety of protocol data encapsulation that will comprise in will asking becomes the mobile network to carry;
Wherein, described mobile network 3G Access Network preferably in the present embodiment, but be not limited to this; And wherein each kind of protocol data be generally and support the H.323 video data of agreement, equally also is not limited to this; For example after receiving described data transfer request, the variety of protocol data encapsulation that comprises in this request being become the PS(grouping of 3G carrying) domain business data carries out transparent transmission, then directly these data are sent to the 3G Access Network, recycle existing high speed 3G network and transfer data to IP network; And this moment, 3G network did not interfere with H.323 protocol data bag content, just bag is simply transmitted, therefore, existing 3G network can be used as the H.323 Access Network of agreement in essence, do not need like this to change the terminal of supporting former protocols having (H.323 agreement), can realize supporting mobile video professional, also reduce the manufacturing cost of equipment simultaneously; In addition, owing to only data are encapsulated transparent transmission, therefore do not need H.323 or H.324 waiting agreement to do special support yet; Simultaneously, the scheme of the present embodiment can be supported interconnecting between the video network of various protocols equally in the long term, thereby so that the function of network is strengthened greatly, has very strong autgmentability;
It should be noted that, in traditional scheme after accessing terminal to network, mainly carry out transfer of data by circuit domain (CS territory) business, and described CS territory generally can only reach the bearing capacity of 64kbps, therefore also just larger for requiring the larger mobile real-time media stream data of bandwidth (for example mobile video data) affected by the bandwidth in CS territory, thus be difficult to reach customer satisfaction system effect; And in the scheme of the embodiment of the invention, directly the real-time media stream data data encapsulation is become mobile network's packet domain (PS territory) packet, maximum bearing capacity can reach 512kbps, this transmission speed has greatly guaranteed the bandwidth demand of transfer of data, easily satisfies the user to demands such as real-time media stream data fluency such as mobile videos.
Step 203: via the mobile network described block domain data bag is transferred to equipment of the core network, finish transmission so that the real-time media stream data of described equipment of the core network after with decapsulation sends to the target side terminal by IP network;
In embodiments of the present invention, described equipment of the core network comprises SGSN(Serving GPRSSupport Node, Serving GPRS Support Node at least) and GGSN(Gateway GPRS SupportNode, Gateway GPRS Support Node); Wherein, during implementation, send data to the SGSN equipment of core net via mobile access network, after SGSN and GGSN equipment are set up secure tunnel, after described data are encapsulated, then be forwarded to GGSN; After GGSN equipment is received packet, carry out decapsulation, and obtain the IP address in the packet, according to the IP address that obtains packet is sent to again the target terminal of opposite end by IP network, to set up the multimedia call passage, finish the transmission of real-time media stream data; And through IP network transmission initiate request with user terminal the time data are complete H.323 data of equity, the therefore data of transmission this moment in IP network namely have been packet H.323.Wherein, described IP address can obtain from described data transfer request when encapsulating for the first time, does not repeat them here.
Can find out, adopt the method for the embodiment of the invention, by mobile real-time media stream data being encapsulated as the block domain data of mobile network's carrying, by mobile network and I P network described mobile real-time media stream data is sent to target terminal, thereby is realizing effective transmission of mobile real-time media stream data; Owing to having adopted the mobile network to transmit, guaranteed the high broadband requirement of mobile real-time media stream data transmission, and need not existing terminal is transformed and upgraded, thereby can effectively control cost.
In addition, based on same thought, this embodiment of the invention 2 has also proposed a kind of device of transmitting real-time media stream data, and as shown in Figure 3, this device 300 comprises: receiving element 301, encapsulation unit 302 and transmitting element 303; Wherein,
Described receiving element 301 is used for the real-time media stream data transmission request that receiving terminal is initiated; As in video-signal system, receiving the H.323 video conference request of video terminal transmission; And described receiving element also can comprise wired and/or wave point, is used for the real-time media stream data transmission request of initiating by wired or wireless mode receiving terminal.
The block domain data bag that the variety of protocol data encapsulation that the data transfer request that described encapsulation unit 302 is used for that described receiving element is received comprises becomes the mobile network to carry;
Described transmitting element 303 is used for described block domain data bag is transferred to equipment of the core network by the mobile network, finishes transmission so that the real-time media stream data of described equipment of the core network after with decapsulation sends to the target side terminal by IP network.
Take video-signal system as example, H.323 this device after having connected terminal, become the variety of protocol data encapsulation PS business datum of 3G carrying to carry out transparent transmission, so, this device namely directly sends data to the 3G Access Network as coffret, then utilize existing high speed 3G network to transfer data to IP network, so H.323 all can realize supporting that mobile video is professional by this device in the situation of the terminal of agreement not needing to change original support, the while also reduced the manufacturing cost of equipment; And because this device only encapsulates data and transparent transmission, so do not need agreement H.323 or is H.324 done special support yet; In addition, this device also can comprise the unit 304 of upgrading, and is used for receiving outside instruction and carries out agreement upgrading or renewal, and notify described encapsulation unit to adopt new agreement to carry out data encapsulation; Can realize and being connected of other protocol terminals by expansion, thereby can so that the function of network is strengthened greatly, have very strong autgmentability.
Based on above-mentioned thought, the embodiment of the invention 3 has proposed again a kind of video conferencing system, comprises video terminal, and as shown in Figure 4, this system also comprises: transmitting device, SGSN and GGSN; Wherein,
Described video terminal is used for initiating the video conference request and receiving the video data that other video terminals transmit; Wherein, described video terminal can be connected by wired and/or wireless mode with described transmitting device;
Described transmitting device is used for receiving the video conference request that described video terminal is initiated, and the video data of support the first agreement that will comprise in will asking directly is packaged into the PS domain business data bag for 3G network carrying, via the 3G access network described block domain data bag is sent to the SGSN equipment of core net again; Described SGSN and GGSN equipment are set up secure tunnel, and after the packet that described 3G network sends encapsulated, it are forwarded to GGSN; Described GGSN equipment carries out decapsulation, and obtains the IP address in the packet after receiving the packet of described SGSN transmission, then according to the IP that obtains Packet Generation is arrived IP network, at this moment transmits the data in IP network, has been the first protocol data bag; By IP network the first protocol data is sent to the opposite end video terminal again, set up the multimedia call passage, carry out the real-time media stream data transmission;
In addition, described transmitting device can comprise: receiver module, package module and sending module; Wherein, described receiver module is used for the video conference request that the receiver, video terminal is initiated; Described package module is packaged into the block domain data bag of mobile network's carrying for the video data of support the first agreement that described video conference request is comprised; Described sending module is used for described block domain data bag is sent to SGSN by the mobile network;
In addition, described transmitting device also can comprise: the unit of upgrading is used for receiving outside instruction and carries out agreement upgrading or renewal, and notifies described package module to adopt new agreement to carry out data encapsulation.
It should be noted that in native system embodiment, described video terminal is preferably H.323 video terminal, described the first protocol data is to support the H.323 data of agreement, certainly is not limited to this, does not repeat them here.
Can find out, adopt the system of the present embodiment when carrying out video conference, to realize taking full advantage of existing device, the terminal (such as terminal H.324) that does not need the new agreement of the support that more renews, do not need to add new protocol conversion gateway (such as protocol conversion gateway H.324) yet, when providing cost savings, also saved cost and the maintenance cost of the network architecture; Thereby it compares with traditional video-signal system, and higher to the utilance of existing device, expense is cheap, and easy to maintenance.
It will be understood by those skilled in the art that and to represent information, message and signal with many different techniques and in the technology any one.For example, the message of mentioning in the above-mentioned explanation, information can be expressed as voltage, electric current, electromagnetic wave, magnetic field or magnetic particle, light field or above combination in any.
The professional can also further should be able to recognize, unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or the combination of the two, for the interchangeability of hardware and software clearly is described, composition and the step of each example described in general manner according to function in the above description.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.The professional and technical personnel can specifically should be used for realizing described function with distinct methods to each, but this realization should not thought and exceeds scope of the present invention.
The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can directly use the software module of hardware, processor execution, and perhaps the combination of the two is implemented.Software module can place the storage medium of any other form known in random asccess memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or the technical field.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the present invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can be in the situation that do not break away from the spirit or scope of the present invention, in other embodiments realization.Therefore, the present invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, is equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (8)
1. the method for a transmitting real-time media stream data is characterized in that, comprising:
The real-time media stream data transmission request that receiving terminal is initiated;
The block domain data bag that becomes the mobile network to carry the variety of protocol data encapsulation that comprises in the request;
Via the mobile network described block domain data bag is transferred to Serving GPRS Support Node (SGSN) in the core net, SGSN and Gateway GPRS Support Node (GGSN) is set up secure tunnel and the block domain data bag encapsulated again after be forwarded to GGSN in the core net by SGSN;
Described GGSN carries out decapsulation to the packet that receives from SGSN, obtains the target ip address of described real-time media stream data, according to this target ip address described data communication device is crossed I P network and is sent to target terminal and finishes transmission;
Wherein, corresponding initiating terminal and the target terminal of the described real-time media stream data transmission request that receives is the terminal of supporting same protocol; Equipment of the core network comprises SGSN and GGSN at least.
2. method according to claim 1 is characterized in that:
Described initiating terminal and described target terminal are video terminal H.323, and described real-time media stream data transmission request is that H.323 video conference request, described real-time media stream data are to support the H.323 video data of agreement.
3. method according to claim 1 is characterized in that:
Described mobile network is the 3G Access Network.
4. a video conferencing system comprises video terminal, it is characterized in that, also comprises: transmitting device, SGSN and GGSN; Wherein,
Described video terminal is used for initiating the video conference request and receiving the video data that other video terminals transmit;
Described transmitting device comprises: receiver module, package module and sending module; Wherein,
Described receiver module is used for the video conference request that the receiver, video terminal is initiated;
Described package module is packaged into the block domain data bag of mobile network's carrying for the video data of support the first agreement that described video conference request is comprised;
Described sending module is used for described block domain data bag is sent to SGSN by the mobile network;
Described SGSN is used for receiving the block domain data bag that described transmitting device sends over by the mobile network, and is transmitted to described GGSN after it is encapsulated;
Described GGSN is used for carrying out decapsulation to receiving packet, and obtains the IP address of described packet, according to described IP address described video data is sent to the target video terminal by IP network again;
Wherein, corresponding initiation video terminal and the target video terminal of the described real-time media stream data transmission request that receives is to support the terminal of same protocol.
5. system according to claim 4 is characterized in that, described transmitting device also comprises: the unit of upgrading is used for receiving outside instruction and carries out agreement upgrading or renewal, and notifies described package module to adopt new agreement to carry out data encapsulation.
6. system according to claim 5, it is characterized in that: described initiation video terminal is connected by wired and/or wireless mode with described transmitting device.
7. according to claim 4 to the described system of 6 any one, it is characterized in that:
Described mobile network is the 3G Access Network.
8. according to claim 4 to the described system of 6 any one, it is characterized in that:
Described initiation video terminal and described target video terminal are video terminal H.323, and described the first agreement is agreement H.323.
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