CN102387176A - Method for realizing content delivery among inter-connected content delivery networks (CDN) and CDN interconnecting architecture - Google Patents
Method for realizing content delivery among inter-connected content delivery networks (CDN) and CDN interconnecting architecture Download PDFInfo
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Abstract
The invention discloses a method for realizing content delivery among inter-connected CDN and a CDN interconnecting architecture. The content delivery share among inter-connected CDN is completed through inter-connected gateways (controllers) which are arranged in the CDN, so the delivery and share of content among the CDN are realized, and the delivered content can serve more users.
Description
Technical field
The present invention relates to content distributing network (CDN, Content Delivery Network) technology, refer to realize between a kind of CDN of interconnection the framework of method of content distribution and CDN interconnection especially.
Background technology
CDN is the new network architecture of one deck that in existing internet (Internet), increases; Pass through CDN; With the content release of website near the edge of user's network; Make the user can obtain required content nearby, solved the situation of Internet network congestion, improved the response speed of user capture website.Through CDN, solved the slow-footed problem of user capture little owing to the network bandwidth, that the user capture amount is big, the unequal reason of network point distribution causes technically comprehensively.
At present, except providing the internet C DN system of buffer memory for the various contents of open internet, some telecommunications operators have also set up the CDN network of various proprietary services in its private network, such as Web TV (IPTV) the CDN system that multimedia service is provided for the user.No matter be internet C DN system; Or telecommunications operator private network CDN system; All be single independently CDN system, as shown in Figure 1, the content operation pattern of single CDN system roughly comprises usually: CDN obtains original contents from signatory content supplier carries out content and injects; Then, in the CDN internal system content is distributed to the fringe node near the user; Request is finally loaded to from its nearest fringe node during user capture.
For each CDN system that extensively sets up at present, common use respectively content is separately served for user separately.Obviously, content supplier's number that single CDN system is signatory and be limited from the content that content supplier obtains, the number of users that can cover also is limited (considering from the CDN construction cost).In order to make that the content of distribution can be more user's service, it is necessary that the distribution of carrying out content at (between the interconnection CDN) between the CDN is shared.At present, provide concrete implementation for the content distribution media between interconnection CDN.
Summary of the invention
In view of this, main purpose of the present invention is to provide the framework of realizing method of content distribution and CDN interconnection between a kind of CDN of interconnection, can be implemented in the distribution of carrying out content between the CDN and share, and makes the content of distribution can be more user's service.
For achieving the above object, technical scheme of the present invention is achieved in that
Realize method of content distribution between a kind of interconnection content distributing network CDN, comprising: CDN obtains content from the CDN with its interconnection; Accomplish the CDN that content is provided of content distribution and response and its interconnection.
This method also comprises: said CDN carries out metadata conversion and/or code conversion.
This method also comprises: the CDN that obtains content reports statistical information to the CDN that content is provided.
Also comprise before this method: initiate to push the Push notification message with the CDN of said CDN interconnection.
Carry content metadata information in the said propelling movement Push message; Said CDN obtains content from the CDN with its interconnection and comprises:
Said CDN resolves the propelling movement Push notification message of receiving, notifies self place content valut from the content valut at the CDN place of said and its interconnection, to obtain content corresponding.
Also comprise before this method: said CDN sends to the CDN with its interconnection and pulls out the Pull request message;
With the CDN of said CDN interconnection receive pull out the Pull request message after, return the metadata information of request content to said CDN.
This method also comprises:
Said CDN judge the coded message of content shared, and/or whole metadata description mode is consistent with self according to the metadata information that receives;
Said CDN carries out in real time or the code conversion of off-line the content of obtaining; And/or,
Said CDN changes the expression mode to said metadata.
Said CDN obtains content corresponding and finally for the user service is provided from the CDN of its interconnection; Original content shared is provided and service is not provided with the CDN of said CDN interconnection for the user.
A kind of framework of CDN interconnection is provided with interconnecting gateway in said CDN, and realizes the interconnection between CDN through this interconnecting gateway;
CDN obtains content from the CDN with its interconnection; Accomplish the CDN that content is provided of content distribution and response and its interconnection.
Said interconnecting gateway comprises content distribution control module at least, and statistical information reports/processing module: wherein,
Content distribution control module is used to trigger and injects notification message or accomplish the response message of injecting; The content metadata modular converter is used to receive the notice from content distribution control module, carries out the conversion of data representation mode between the isomery CDN;
Statistical information reports/processing module, be used for to user capture content shared flow information statistics, report.
Said interconnecting gateway also comprises the content encoding modular converter;
Said content distribution control module also is used for confirming that needs carry out code conversion, content of announcement code conversion module according to injecting notification message;
The content encoding modular converter is used to receive the notice from content distribution control module, the conversion of the coded format of carrying out supporting between the isomery CDN.
Said interconnecting gateway also comprises the content metadata modular converter;
Said content distribution control module also is used for confirming that needs carry out metadata conversion, content of announcement metadata conversion module according to injecting notification message;
Said content metadata modular converter is used to receive the notice from content distribution control module, carries out the conversion of data representation mode between the isomery CDN.
Can find out from the technical scheme that the invention described above provides; CDN of the present invention is through being arranged on interconnecting gateway (controller) wherein; The content distribution of having accomplished between the CDN that interconnects is shared; Thereby the distribution that has realized between CDN, carrying out content is shared, and makes that the content of distribution can be more user's service.
Description of drawings
Fig. 1 is the sketch map of the content operation pattern of existing single CDN system;
The sketch map of Fig. 2 realizes the content distribution for the present invention interconnects between CDN group-network construction;
Fig. 3 is the composition structural representation of the interconnecting gateway among the CDN of the present invention's interconnection;
Fig. 4 is for realizing the sketch map of the embodiment of the group-network construction that content is distributed between the CDN of the present invention's interconnection;
The structural representation of the embodiment of the group-network construction that Fig. 5 separates with service for content stores among the CDN of the present invention interconnection;
Fig. 6 is for realizing the flow chart of method of content distribution between the CDN of the present invention's interconnection;
Fig. 7 is for realizing the sketch map of first embodiment of method of content distribution between the CDN of the present invention's interconnection;
Fig. 8 is for realizing the sketch map of second embodiment of method of content distribution between the CDN of the present invention's interconnection.
Embodiment
The structural representation of the embodiment of Fig. 2 realizes the content distribution for the present invention interconnects between CDN group-network construction, as shown in Figure 2, comprise at least: two CDN of interconnection,
In the framework of CDN interconnection of the present invention; Interconnecting gateway (Interconnection Gateway) is set among the CDN; Or be called controller (Controller); Share through the mutual completion content distribution between the interconnecting gateway (controller) between the CDN of interconnection, realize the interconnection between CDN through interconnecting gateway.As shown in Figure 3, interconnecting gateway (controller) includes but not limited to following functional module:
Content distribution control module is used to trigger and injects notification message or accomplish the response message of injecting; Confirm that according to injecting notification message needs carry out metadata conversion, content of announcement metadata conversion module further, receives the completion response from the content metadata modular converter; Confirm that according to injecting notification message needs carry out code conversion, content of announcement code conversion module further, receives the completion response from the content encoding modular converter;
The content metadata modular converter is used to receive the notice from content distribution control module, carries out the conversion of data representation mode between the isomery CDN, and further, content metadata converts back response contents distribution control module;
The content encoding modular converter is used to receive the notice from content distribution control module, the conversion of the coded format of carrying out supporting between the isomery CDN, and further, content encoding converts back response contents distribution control module;
Statistical information reports/processing module, be used for to information such as user capture content shared flows statistics, report, such as adding up, report according to predetermined period etc.The reporting of statistical information/processing module can be interests between the upstream and downstream CDN and is divided into foundation is provided.
Need to prove; For the CDN that content shared only is provided; Its interconnecting gateway (controller) is mainly used in realizes content distribution control; And to the statistics of information such as user capture content shared flow, report, therefore, only need be provided with the reporting of content distribution control module and statistical information/processing module and get final product;
For the CDN that accepts content, its interconnecting gateway (controller) needs repertoire module shown in Figure 3 usually.Certainly, for clear and definite isomorphism CDN system, the interconnecting gateway (controller) of accepting the CDN of content also can include only reporting/processing module of content distribution control module and statistical information.
Here, isomorphism CDN system is meant that each CDN serves identical system, as all serving the IPTV system, perhaps all serves mobile stream media system etc.Isomery CDN system is meant, the situation that exists CDN to serve different systems, and in CDN, the IPTV system that serves that has, what have serves mobile stream media system etc.
Only be the interconnection and the mutual realization that between the CDN among Fig. 3, the CDN of interconnection still keeps its prior function, such as CDN content stores is provided, and external user's service ability etc. is provided.
Through the present invention, CDN is through being arranged on interconnecting gateway (controller) wherein, and the content distribution of having accomplished between the CDN of interconnection is shared, thereby realized that the distribution of between CDN, carrying out content shares, and makes that the content of distribution can be more user's service.
Among this paper, describe for ease, the CDN that will interconnect is divided into source CDN and target CDN: source CDN initially obtains content from original contents provider, then the content that obtains is distributed to target CDN, shares to realize the distribution of content between interconnection CDN.Fig. 4 is for realizing the structural representation of the embodiment of the group-network construction that content is distributed between the CDN of the present invention's interconnection, and is as shown in Figure 4, and each CDN of interconnection has realized the content distribution between CDN through interconnecting gateway (controller) and shared.Source CDN (comprising CDN1 and CDN2) is as content source, for target CDN (CDN3) provides content shared.
Wherein, source CDN and target CDN can provide content stores and external user's service ability simultaneously, but source CDN can provide the content sharing service to target CDN only as the content stores center, and concrete externally user service is provided by target CDN.The linking number of source CDN and target CDN depends on concrete commercial operation pattern (having contract signing relationship between the two).Can there be multiple mode to realize being connected between source CDN and the target CDN; The dynamic discovery of static configuration, interconnecting gateway that comprises prior interconnecting gateway address is as registering to a unified registration center or the broadcasting discovery mode of interconnecting gateway etc.; The concrete realization belongs to those skilled in the art's conventional techniques means, repeats no more here.
The system that Fig. 5 separates with service for content stores among the CDN of the present invention interconnection the sketch map of embodiment of group-network construction; As shown in Figure 5; Source CDN (CDN1) is as a stand-alone content storage center; CDN1 self does not externally provide the user to serve, through interconnecting gateway to its down each target CDN (CDN2 and CDN3) of interconnection content is provided, and be that the user provides service by CDN2 and CDN3.
Fig. 6 is for realizing the flow chart of method of content distribution between the CDN of the present invention's interconnection, and is as shown in Figure 6, may further comprise the steps:
Step 600:CDN obtains content through interconnecting gateway from the CDN with its interconnection.
As shown in Figure 2, CDN of the present invention shares through the mutual completion content distribution between the interconnecting gateway (controller).
Step 601:CDN carries out metadata conversion and/or code conversion.
This step can be omitted in isomorphism CDN system.In isomery CDN system, different CDN is different to expressing possibility of content metadata, need carry out the conversion of content metadata; And/or the content encoding form that different CDN supports is different, such as can from the metadata description information of content shared, knowing its coded format, need carry out the conversion of content encoding.Wherein, Realizing that according to the different protocol regulation conversion of content metadata and the conversion of content encoding are that those skilled in the art realize easily, also is the conventional techniques means; Here no longer detail, and its concrete implementation method and be not used in qualification protection scope of the present invention.
Step 602: accomplish content distribution back through the CDN that content is provided of interconnecting gateway response with its interconnection.
The inventive method also comprises: the CDN that obtains content reports the statistical informations such as user capture flow like content shared to the CDN that content is provided.
Below in conjunction with embodiment the inventive method is described in detail.
Fig. 7 is for realizing the sketch map of first embodiment of method of content distribution between the CDN of the present invention's interconnection; Among first embodiment; Source CDN (CDN1) sends and pushes (Push) notification message, and target CDN (CDN2) receives that CDN obtains content from the source in Push notice back, and CDN system (comprising CDN1 place content valut) is distributed to target CDN system (comprising CDN2 place content valut) from the source to realize content; As shown in Figure 7, the concrete realization may further comprise the steps:
The 1st step: CDN1 gives CDN2 through the Push notification message that content distribution control module is sent request content, in the Push notification message, carries content metadata information, such as content in the deposit position of CDN1 place content valut, transmission means etc.
The content distribution control module of the 2nd step: CDN2 is resolved the Push notification message of receiving, obtains content corresponding in the content valut of notice CDN2 self place content valut from source CDN system.
Usually; The Push notification message adopts structurized descriptor such as extend markup language (XML) mode; From structural description, CDN2 can be known: the coded message of content shared, and whether whole metadata description mode is consistent with self; Whether need carry out the content encoding conversion thereby can confirm, and/or metadata conversion.
The 3rd step: the content valut at CDN2 place obtains corresponding contents from the content valut at CDN1 place.
The 4th step: in the content distribution procedure; Carry out code conversion like needs; The content of CDN2 distribution control module notifies its content encoding modular converter to carry out in real time or (obtain accomplish the back in content) code conversion operation of off-line, and the code conversion operation comprises the file format conversion, support code check to change (being transformed into low code check from high code check) etc.
The 5th step: need carry out metadata conversion if confirm; The content distribution control module content of announcement metadata conversion module of CDN2 is carried out metadata conversion; After promptly confirming successfully after expression CDN actual content download and code conversion are accomplished; Can carry out metadata conversion, to write down a just-downloaded content information.Common metadata conversion comprises representes that with structural data among the CDN1 mode is mapped as the operation that structural data among the CDN2 is represented mode.
The 6th step: after the content distribution was accomplished, promptly content was obtained completion, code conversion completion, metadata conversion completion, and the content distribution control module of CDN2 is sent content to the content distribution control module of CDN1 and distributed the completion acknowledge message.
Fig. 8 is for realizing the sketch map of second embodiment of method of content distribution between the CDN of the present invention's interconnection; Among second embodiment; Target CDN (CDN2) initiatively initiates to pull out (Pull) request message, and the CDN from the source (CDN1) obtains content, and CDN system (comprising CDN1 place content valut) is distributed to target CDN system (comprising CDN2 place content valut) from the source to realize content; As shown in Figure 8, specifically may further comprise the steps:
The 1st step: CDN2 initiatively sends content Pull request message to CDN1.
The 2nd step: after CDN1 receives the Pull request message, return the metadata information of request content to CDN2.
The 3rd step～the 7 step: CDN2 carries out series of operations such as obtaining of actual content according to the content metadata information of returning; Concrete realization is consistent with～the 6 step of the 2nd step among first embodiment shown in Figure 7; Be that those skilled in the art realize on the basis of first embodiment easily, repeat no more here.
The above is merely preferred embodiment of the present invention, is not to be used to limit protection scope of the present invention, all any modifications of within spirit of the present invention and principle, being done, is equal to replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (12)
1. realize method of content distribution between an interconnection content distributing network CDN, it is characterized in that comprise: CDN obtains content from the CDN with its interconnection; Accomplish the CDN that content is provided of content distribution and response and its interconnection.
2. method according to claim 1 is characterized in that, this method also comprises: said CDN carries out metadata conversion and/or code conversion.
3. method according to claim 1 and 2 is characterized in that, this method also comprises: the CDN that obtains content reports statistical information to the CDN that content is provided.
4. method according to claim 1 is characterized in that, also comprises before this method: initiate to push the Push notification message with the CDN of said CDN interconnection.
5. method according to claim 4 is characterized in that, carries content metadata information in the said propelling movement Push message; Said CDN obtains content from the CDN with its interconnection and comprises:
Said CDN resolves the propelling movement Push notification message of receiving, notifies self place content valut from the content valut at the CDN place of said and its interconnection, to obtain content corresponding.
6. method according to claim 1 is characterized in that, also comprises before this method: said CDN sends to the CDN with its interconnection and pulls out the Pull request message;
With the CDN of said CDN interconnection receive pull out the Pull request message after, return the metadata information of request content to said CDN.
7. according to claim 5 or 6 described methods, it is characterized in that this method also comprises:
Said CDN judge the coded message of content shared, and/or whole metadata description mode is consistent with self according to the metadata information that receives;
Said CDN carries out in real time or the code conversion of off-line the content of obtaining; And/or,
Said CDN changes the expression mode to said metadata.
8. method according to claim 1 is characterized in that, said CDN obtains content corresponding and finally for the user service is provided from the CDN of its interconnection; Original content shared is provided and service is not provided with the CDN of said CDN interconnection for the user.
9. the framework of a CDN interconnection is characterized in that, in said CDN, is provided with interconnecting gateway, and realizes the interconnection between CDN through this interconnecting gateway;
CDN obtains content from the CDN with its interconnection; Accomplish the CDN that content is provided of content distribution and response and its interconnection.
10. framework according to claim 9 is characterized in that, said interconnecting gateway comprises content distribution control module at least, and statistical information reports/processing module: wherein,
Content distribution control module is used to trigger and injects notification message or accomplish the response message of injecting; The content metadata modular converter is used to receive the notice from content distribution control module, carries out the conversion of data representation mode between the isomery CDN;
Statistical information reports/processing module, be used for to user capture content shared flow information statistics, report.
11. framework according to claim 10 is characterized in that, said interconnecting gateway also comprises the content encoding modular converter;
Said content distribution control module also is used for confirming that needs carry out code conversion, content of announcement code conversion module according to injecting notification message;
The content encoding modular converter is used to receive the notice from content distribution control module, the conversion of the coded format of carrying out supporting between the isomery CDN.
12., it is characterized in that said interconnecting gateway also comprises the content metadata modular converter according to claim 10 or 11 described frameworks;
Said content distribution control module also is used for confirming that needs carry out metadata conversion, content of announcement metadata conversion module according to injecting notification message;
Said content metadata modular converter is used to receive the notice from content distribution control module, carries out the conversion of data representation mode between the isomery CDN.
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| CN103281568B (en) * | 2013-04-25 | 2016-11-09 | 网宿科技股份有限公司 | Realize the method and system of live streaming media dynamic code rate |
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