CN102118323A - Content delivery network server and content downloading method - Google Patents
Content delivery network server and content downloading method Download PDFInfo
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Abstract
The invention discloses a content delivery network server and a content downloading method. The content downloading method comprises that: an access content delivery network (CDN) server of user equipment receives a content request from the user equipment, wherein the content request carries an identifier of requested contents; the access CDN server acquires the position information of the contents corresponding to the identifier by a peer-to-peer overlay network; and the access CDN server downloads the contents according to the position information by a peer-to-peer universal content delivery network, and transmits the downloaded contents to the user equipment by the content delivery network server and the content downloading method, the application range of the peer-to-peer universal content delivery network can be widened, and user experiences can be improved.
Description
Technical field
The present invention relates to communication and technical field of the computer network, in particular to a kind of content distributing network (Content Delivery Network abbreviates CDN as) server and content download method.
Background technology
The purpose that content distributing network (Content Delivery Network abbreviates CDN as) proposes is in order to extenuate the pressure that user and professional growth bring to network, to enjoy good service quality to guarantee the user who is distributed in each corner of network.CDN by with content caching at network edge, thereby reduced flow by network backbone, saved the cost of operator's dilatation, also improved the speed of user capture content.
At present, content distributing network can be supported polytype content distributions such as Streaming Media, improve internet television (Internet Protocol Television or Interactive PersonalTelevision, abbreviate IPTV as), video request program (Video on Demand, abbreviate VoD as), professional service quality such as Online Music, and optimize these professional flows.In existing content distributing network, usually by Virtual network operator as the content distributing network supplier, the unified content distributing network by the server structure is provided, support flow optimization and high quality services quality (Quality of Service, abbreviate QoS as), content distributing network is distributed to network edge with content, and the content distributing network of users from networks operator obtains content-data.
As shown in Figure 1, in order to strengthen reliability and autgmentability, reduce the deployment maintenance cost, point-to-point (Point To Point abbreviates P2P as) technology has been used to set up the reciprocity Versatile content distributing network (being called P2P CDN) of contents such as supporting Streaming Media and file.
As shown in Figure 2, in the prior art, the basic procedure that UE downloads content from reciprocity Versatile content distributing network is: UE inserts the positional information that the location-server inquiry needs downloaded contents by it earlier, and then selects the position of one or more optimums to download content from the positional information that obtains.
But in actual applications, some UE may not support this first inquiring position downloading mode of chosen position download again, and these UE only support the downloading mode of direct request content.Therefore, according to existing download flow process, these UE can't use reciprocity Versatile content distributing network, download content from reciprocity Versatile content distributing network, thereby reduce user experience.
Can't effective solution not proposed at present as yet from the problem of reciprocity Versatile content distributing network download content at some UE in the correlation technique.
Summary of the invention
Can't download the problem of content and propose the present invention from reciprocity Versatile content distributing network at some UE in the correlation technique, for this reason, main purpose of the present invention be to provide a kind of access CDN server and content download method, to address the above problem.
To achieve these goals, according to an aspect of the present invention, provide a kind of CDN server.
CDN server according to the present invention is applied to the reciprocity Versatile content distributing network be made up of a plurality of CDN servers, wherein, part or all of CDN server in above-mentioned a plurality of CDN server is formed the reciprocity overlay network of reciprocity Versatile content distributing network, this equity overlay network adopts the positional information of the distributed storage mode memory contents of equity, this CDN server comprises: receiver module is used to receive the request of subscriber equipment transmission by reciprocity Versatile content distributing network download requests for content message; Enquiry module is used for the positional information of the content of being asked by reciprocity overlay network inquiring user equipment; Download module is used for the positional information that inquires according to enquiry module, downloads this content by reciprocity Versatile content distributing network; Sending module is used for foregoing is sent to subscriber equipment.
Further, above-mentioned CDN server also comprises: judge module, be used to judge the CDN server whether buffer memory the foregoing of user equipment requests, if, then trigger sending module this content of buffer memory sent to subscriber equipment, otherwise, trigger enquiry module.
Further, above-mentioned CDN server also comprises: first cache module is used for buffer memory download module downloaded contents.
Further, above-mentioned CDN server also comprises: update module is used for utilizing the positional information of the foregoing that the reciprocity overlay network of the updating location information equity Versatile content distributing network of CDN server stores.
Further, above-mentioned enquiry module comprises: judging unit is used to judge whether the CDN server is cached with the positional information of foregoing, if then trigger the positional information that acquiring unit obtains this content of buffer memory; Otherwise, trigger acquiring unit obtains this content from reciprocity overlay network positional information; Acquiring unit is used to obtain the positional information of the foregoing of buffer memory, or obtains the positional information of this content from reciprocity overlay network.
Further, above-mentioned CDN server also comprises: second cache module is used for the positional information of the foregoing that the buffer memory acquiring unit obtains from reciprocity overlay network.
To achieve these goals, according to a further aspect in the invention, a kind of content download method is provided, this method is used for downloading content by reciprocity Versatile content distributing network from content delivering system, wherein, equity Versatile content distributing network comprises a plurality of CDN servers, part or all of CDN server in these a plurality of CDN servers is formed the reciprocity overlay network of reciprocity Versatile content distributing network, the equity overlay network adopts the positional information of the distributed storage mode memory contents of equity, this method comprises: the access CDN server of subscriber equipment receives the content requests from this subscriber equipment, wherein, carry the sign of the content of request to some extent in this content requests; Insert the CDN server obtains the corresponding content of this sign by reciprocity overlay network positional information; Insert the CDN server according to this positional information, download this content by reciprocity Versatile content distributing network, and downloaded contents is sent to subscriber equipment.
Preferably, inserting the positional information that the CDN server obtains foregoing comprises: insert the CDN server obtains this content from reciprocity overlay network positional information.
Preferably, insert the positional information that the CDN server obtains foregoing and comprise: insert the positional information that the CDN server judges whether to be cached with this content, if then obtain the positional information of this content of buffer memory; Otherwise, insert the CDN server obtains this content from reciprocity overlay network positional information.
Further, access CDN server obtains the positional information of foregoing from reciprocity overlay network after, this method also comprises: insert the positional information that the CDN server determines not have this content of buffer memory, the positional information of this content that buffer memory obtains from reciprocity overlay network.
Further, insert the CDN server and download before the foregoing, this method also comprises: insert the CDN server foregoing that judged whether buffer memory, if, then this content with buffer memory sends to subscriber equipment, otherwise, insert the CDN server and carry out the operation of downloading this content.
Further, after inserting CDN server download foregoing, this method also comprises: insert the CDN server and determine not have the buffer memory foregoing, then this content of buffer memory download.
Further, after inserting CDN server buffer foregoing, this method also comprises: the positional information that inserts this content of storing in its updating location information equity overlay network of CDN server by utilizing.
By the present invention, access CDN server agent UE by UE carries out the inquiry of location of content, and act on behalf of UE and download content, downloaded contents is sent to UE, having solved some UE can not make reciprocity Versatile content distributing network download the problem of content, and then reach the range of application of having expanded reciprocity Versatile content distributing network, improved user experience.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the configuration diagram according to the reciprocity Versatile content distributing network of prior art;
Fig. 2 is the basic flow sheet of downloading according to the content of prior art;
Fig. 3 is a kind of networking mode schematic diagram according to the reciprocity Versatile content distributing network of the CDN server application of the embodiment of the invention;
Fig. 4 is the another kind of networking mode schematic diagram according to the reciprocity Versatile content distributing network of the CDN server application of the embodiment of the invention;
Fig. 5 is the structural representation according to the CDN server of the embodiment of the invention;
Fig. 6 is the structural representation according to the CDN server of first preferred embodiment of the invention;
Fig. 7 is the structural representation according to the CDN server of second preferred embodiment of the invention;
Fig. 8 is the structural representation according to the CDN server of third preferred embodiment of the invention;
Fig. 9 is the flow chart according to the content download method of the embodiment of the invention;
Figure 10 is the flow chart according to the embodiment of the invention one;
Figure 11 is the flow chart according to the embodiment of the invention two;
Figure 12 is the flow chart according to the embodiment of the invention three;
Figure 13 is the flow chart according to the embodiment of the invention four.
Embodiment
Hereinafter will describe the present invention with reference to the accompanying drawings and in conjunction with the embodiments in detail.Need to prove that under the situation of not conflicting, embodiment and the feature among the embodiment among the application can make up mutually.
Need to prove that the hereinafter mentioned content of the embodiment of the invention can be complete Streaming Media or file, also can be a fragment of Streaming Media or file, and the embodiment of the invention is not done qualification to this.
Device embodiment
According to embodiments of the invention, a kind of CDN server is provided, this CDN server user is linked into reciprocity Versatile content distributing network with UE.
For the ease of understanding the CDN server that the embodiment of the invention provides, at first the reciprocity Versatile content distributing network (P2PCDN) used of the CDN server that the embodiment of the invention is provided describes.
In embodiments of the present invention, reciprocity Versatile content distributing network is provided by content distributing network provider, can be made up of a plurality of CDN servers.Form all or part of CDN server of reciprocity Versatile content distributing network and form reciprocity overlay network (being the P2P overlay network), if portion C DN server is formed the P2P overlay network, then other CDN server is the client of P2P overlay network, specifically as shown in Figure 3 and Figure 4.
Fig. 3 and Fig. 4 are the networking mode schematic diagram according to two kinds of reciprocity Versatile content distributing networks of the embodiment of the invention, in networking mode shown in Figure 3, all CDN servers are reciprocity fully, all CDN servers are formed the reciprocity overlay network of reciprocity Versatile content distributing network, and the access CDN server of UE is in reciprocity overlay network.In networking mode shown in Figure 4, the CDN server is divided into two-stage: portion C DN server has been formed reciprocity overlay network, all the other CDN servers are clients of reciprocity overlay network, can visit reciprocity overlay network, the access CDN server of UE can be in reciprocity overlay network, also can be not in reciprocity overlay network, as the client of reciprocity overlay network.
In concrete the application, the equity overlay network can adopt distributed hashtable (DHT) algorithm to make up, also can adopt other P2P algorithms to make up, and, the equity overlay network can adopt standardized RELOAD protocol construction, be convenient to interconnecting of each manufacturer's exploitation node, perhaps, reciprocity overlay network also can adopt other P2P protocol construction.
Different with the framework of the P2P CDN of prior art shown in Figure 1 is, in Fig. 3 or P2P CDN shown in Figure 4, the CDN server of forming P2P CDN can provide the positional information of content, also can cache contents, promptly in Fig. 3 or reciprocity Versatile content distributing network shown in Figure 4, the P2P overlay network uses the distributed storage method of P2P to come the positional information of all the elements in the storage system.And, the content that the access CDN server of UE can the temporary cache current popular.
Fig. 5 is the structural representation according to the CDN server of the embodiment of the invention, as shown in Figure 5, mainly comprises according to the CDN server of the embodiment of the invention: receiver module 51, enquiry module 53, download module 55 and sending module 57.Wherein, receiver module 51 is used to receive the request of subscriber equipment transmission by reciprocity Versatile content distributing network download requests for content message; Enquiry module 53 is connected with receiver module 51, is used for the positional information of the content of being asked by reciprocity overlay network inquiring user equipment; Download module 55 is connected with enquiry module 53, is used for the positional information that inquires according to enquiry module 53, downloads foregoing by reciprocity Versatile content distributing network; Sending module 57 is connected with download module 55, is used for download module 55 downloaded contents are sent to subscriber equipment.
In concrete the application, subscriber equipment is by the location, login, flow processs such as authentication are linked into the CDN server among the P2P CDN, when needs are downloaded content by P2P CDN, UE initiates request to the CDN of its access server, request is downloaded certain content by P2P CDN, after its receiver module 51 that inserts the CDN server receives this request, the positional information of this UE request downloaded contents of enquiry module 53 inquiries, and after inquiring the positional information of this content, this CDN server agent UE, start download module 55 and download this content, and send to UE by this content that sending module 57 will be downloaded by P2P CDN.
In specifically practicing, UE request downloaded contents can be as the content caching of current popular in the CDN server that this UE inserts, in this case, the CDN server can directly obtain this content of buffer memory, and need not to download this content by P2P CDN, therefore, as shown in Figure 6, CDN server according to first preferred embodiment of the invention is compared with CDN server shown in Figure 5, can also comprise: judge module 50, be used to judge this CDN server whether buffer memory the content of user equipment requests, if, then trigger sending module 57 this content of buffer memory is sent to subscriber equipment, otherwise, download module 55 triggers the positional information of enquiry module 53 these contents of inquiry, so that can be downloaded this content according to this positional information.
Further, if the content that the CDN server does not have buffer memory UE to be asked, then after downloading this content by P2P CDN, can this content of buffer memory, therefore, as shown in Figure 6, the CDN server according to first preferred embodiment of the invention can also comprise: first cache module 52 is used for buffer memory download module 55 downloaded contents.
And, at first cache module, 52 buffer memorys behind the foregoing, when making that subsequent node is inquired about the positional information of this content, can inquire this CDN server, the positional information of this content of storing in can the reciprocity overlay network to P2P CDN is upgraded, therefore, as shown in Figure 7, CDN server according to second preferred embodiment of the invention can also comprise: update module 54 is used for utilizing the positional information of this content that the reciprocity overlay network of the updating location information P2PCDN of this CDN server stores.
In specific implementation process, the equity overlay network tabulates the positional information of all the elements in the storage system by content location, particularly, this content location tabulation comprises: the positional information of storing the node of the one or more contents of storage in the current content delivering system, wherein, node comprise among the following three one of or its combination in any: CDN server, content source node, subscriber equipment; Positional information can be information such as IP addresses of nodes or identification information in specific implementation process, and the sign that can adopt content and the corresponding relation of the positional information of the node of this content of storage write down the positional information of the node of each content of storage.Therefore, when the positional information of this content that update module 54 is stored is upgraded, increase the positional information of a CDN server in this content-location information that can in the tabulation of foregoing memory location, write down in to reciprocity overlay network.
In concrete the application, the content that UE asked may be the content that certain UE asked before, and, when the UE before asks this content, this CDN server can be with the positional information buffer memory of this content, in this case, enquiry module 53 can directly obtain the positional information of buffer memory, therefore, as shown in Figure 8, enquiry module 53 according to the CDN server of third preferred embodiment of the invention can comprise: judging unit 531, be used to judge whether the CDN server is cached with the positional information of foregoing, if then trigger the positional information that acquiring unit 533 obtains this content of buffer memory, otherwise, trigger acquiring unit 533 obtains this content from the P2P overlay network of P2P CDN positional information; Acquiring unit 533 is used to obtain the positional information of the foregoing of buffer memory, or obtains the positional information of this content from the P2P overlay network.
Further, as shown in Figure 8, can also comprise second cache module 56, be used for the positional information of the foregoing that buffer memory acquiring unit 533 obtains from the P2P overlay network according to the CDN server of third preferred embodiment of the invention.
Only show three preferred embodiments of the CDN server that the embodiment of the invention provides among above-mentioned Fig. 6 to Fig. 8, in specific implementation process, CDN server according to the embodiment of the invention can also have numerous embodiments, for example, above-mentioned first cache module 54 and second cache module 56 can exist simultaneously, and these two modules can be unified setting, also can divide to be arranged, specifically not repeat them here.
By the above-mentioned CDN server that the embodiment of the invention provides, can act on behalf of UE and finish the inquiry of positional information of content and the download of content, thereby make the UE of the downloading mode of only supporting direct request content also can download content by P2P CDN.
According to the embodiment of the invention, a kind of content download method also is provided, this method is used for downloading content by P2P CDN from content delivering system.
Fig. 9 is the flow chart according to the content download method of the embodiment of the invention, and as shown in Figure 9, this method mainly may further comprise the steps (step S901-step S905):
The access CDN server of step S901:UE receives the content requests from this UE, wherein, carries the sign of the content of request to some extent in this content requests;
Wherein, the access CDN server of UE is for forming the CDN server of P2P CDN, and UE passes through this CDN server access P2P CDN, and, this access CDN server can be formed a node of the P2P overlay network of P2P CDN, also can be the client of the P2P overlay network of P2PCDN.
Step S903: insert the CDN server obtains the content of above-mentioned sign correspondence by reciprocity overlay network positional information;
Step S905: insert the CDN server according to above-mentioned positional information, download this content by reciprocity Versatile content distributing network, and downloaded contents is sent to UE.
By the foregoing method for down loading that the embodiment of the invention provides, insert the positional information that the CDN server can be acted on behalf of the content of UE inquiry UE request, and download content corresponding, and downloaded contents is sent to UE according to this positional information.
Below in conjunction with specific embodiment the foregoing method for down loading that the embodiment of the invention provides is described.
In the following examples, form all or part of CDN server of P2P CDN and form the P2P overlay network of P2P CDN, the positional information of all the elements in the distributed storage method storage system of P2P overlay network use P2P, particularly, the P2P overlay network is by the positional information (being the memory location of all the elements) of location of content list storage all the elements.
In the following embodiments, be that example describes with the RELOAD agreement as the networking agreement of P2P overlay network, Store and Fetch are the methods that is respectively applied for storage and reading of data resource in the RELOAD overlay network that defines in the RELOAD agreement.
And, in the following embodiments, the node that has content may comprise content source node and/or CDN server, and, the node that has certain content can in this location of content tabulation, can inquire the location storage of self so that want the node of inquiring about in the reciprocity overlay network after obtaining this content.
In the following examples, suppose that UE is linked into CDN server in the content distributing network by flow processs such as a series of location, login, authentications, UE can pass through the address that modes such as name server (Domain Name Server abbreviates DNS as), manual configuration, access server obtain to insert the CDN server.In the following examples, suppose that UE has obtained the essential information of content by approach such as portal websites.
Embodiment one
In the present embodiment, the access CDN server of UE is judged the positional information that it does not have this content of buffer memory, obtains the positional information of the content that UE asks from the P2P of P2P CDN equity overlay network; In addition, in the present embodiment, insert the CDN server do not check its whether buffer memory this content, directly download this content according to the positional information of obtaining, and this content that will download sends to UE by P2P CDN.
Figure 10 is the flow chart of present embodiment, as shown in figure 10, mainly downloads content by following steps in the present embodiment:
Step 101, UE inserts the CDN server to it and sends request, and content is downloaded in request;
Particularly, the request downloaded contents can be a whole Streaming Media, a whole file, also can be a fragment of Streaming Media and file.
Step 102 inserts the CDN server and determines that this locality does not have the positional information of the content that buffer memory UE asked, and inquires about the memory location of this content to the P2P overlay network, specifically inserts the CDN server and can obtain the location of content tabulation by the mode of RELOAD Fetch;
Step 103, the P2P overlay network is to inserting the memory location that the CDN server returns this content, i.e. location of content tabulation;
Step 104 inserts the memory location that the CDN server returns suddenly according to previous step, downloads content from wherein one or more nodes that have content;
Step 105 inserts the CDN server returns foregoing from download to UE.
Embodiment two
In the present embodiment, the access CDN server of UE is when receiving request, judge that at first its positional information that there is not this content of buffer memory does not have this content of buffer memory yet, from the P2P of P2P CDN equity overlay network, obtain and the positional information of the content that buffer memory UE is asked, and pass through P2P CDN according to the positional information of obtaining and download and this content of buffer memory, and this content that will download sends to UE.
Figure 11 is the flow chart of present embodiment, as shown in figure 11, mainly downloads content by following steps in the present embodiment:
Step 111, UE inserts the CDN server to it and sends request, and content is downloaded in request;
Step 112 inserts the CDN server and determines content and this content-location information that this locality does not have buffer memory UE to be asked, and inquires about the memory location of this content to the P2P overlay network;
Step 113, the P2P overlay network is to inserting the memory location that the CDN server returns this content;
Step 114, the memory location of this content of access CDN server buffer;
Step 115 inserts the memory location that the CDN server returns suddenly according to previous step, downloads content from wherein one or more nodes that have content;
Step 116 inserts this content that the CDN server buffer is downloaded;
Insert the CDN server and can directly download and this content of buffer memory, also can satisfy under the pre-conditioned situation, determine this content of buffer memory.Particularly, this pre-conditionedly includes but not limited to one of following or its combination in any:
(1) whether the number of times that inserts this content of CDN server reception request is promptly judged according to the popularity degree of this content above predetermined threshold value, if ask the number of times of this content to surpass predetermined threshold value, very flow process of this content is described, then determines this content of buffer memory;
Whether can buffer memory this content, promptly judge according to self storage capacity that inserts the CDN server if (2) inserting the remaining memory space of CDN server, can this content of buffer memory if insert the remaining memory space of CDN server, then determine this content of buffer memory;
(3) whether the quantity of the node of this content of storage reaches preset value in the content delivering system, if do not have, then determines this content of buffer memory;
(4) whether the node distribution of current this content of storage is reasonable in the content delivering system, if unreasonable, and need insert this content of CDN server buffer at this, then determine this content of buffer memory.
Step 117-118 inserts the CDN server self address is joined in the content location tabulation that the P2P overlay network preserves, and can find this CDN server when after making this location of content of querying node being arranged, and step 117 and step 118 are optional.
Step 119 is returned foregoing, this step and the above-mentioned steps 116 no temporal sequencings of download to UE.
Embodiment three
In the present embodiment, the positional information of the content that UE asked that inserted in the CDN server buffer memory, but do not have this content of buffer memory.
Figure 12 is the flow chart of present embodiment, as shown in figure 12, mainly downloads content by following steps in the present embodiment:
Step 121, UE inserts the CDN server to it and sends request, and content is downloaded in request;
Step 122, insert the CDN server determine this locality do not have content that buffer memory UE asked and but buffer memory this content-location information;
Step 123 inserts the CDN server obtains this content of buffer memory from this locality memory location;
Step 124 inserts the memory location that the CDN server obtains suddenly according to previous step, downloads content from wherein one or more nodes that have content;
Step 125 inserts this content that the CDN server buffer is downloaded;
Step 126-127 inserts the CDN server self address is joined in the content location tabulation that the P2P overlay network preserves, and can find this CDN server when after making this location of content of querying node being arranged, and step 126 and step 127 are optional.
Step 128 is returned foregoing, this step and the above-mentioned steps 125 no temporal sequencings of download to UE.
In above-mentioned steps 123, though insert the memory location that the CDN server has been preserved the content that UE asked,, the accuracy for the memory location that guarantees to obtain inserts the memory location that the CDN server still can obtain this content by the P2P overlay network.
Embodiment four
In the present embodiment, the content that UE asked that inserted the CDN server buffer, directly the content with buffer memory sends to UE.
Figure 13 is the flow chart of present embodiment, as shown in figure 13, mainly downloads content by following steps in the present embodiment:
Step 131, UE inserts the CDN server to it and sends request, and content is downloaded in request;
Step 132, the content that UE asked that access CDN server has been determined local cache;
Step 133, access CDN server sends to UE with this content of buffer memory.
As mentioned above, in embodiments of the present invention, access CDN server agent UE by UE carries out the inquiry of location of content, and act on behalf of UE and download content, downloaded contents is sent to UE, solve some UE and can not make reciprocity Versatile content distributing network download the problem of content, and then reached the range of application of having expanded reciprocity Versatile content distributing network, improved user experience.And, in embodiments of the present invention, insert the content that CDN can buffer memory UE ask and/or the positional information of content, thereby can accelerate the inquiry velocity of positional information and the speed of download of content, raising content downloading efficiency.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with the general calculation device, they can concentrate on the single calculation element, perhaps be distributed on the network that a plurality of calculation element forms, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in the storage device and carry out by calculation element, perhaps they are made into each integrated circuit modules respectively, perhaps a plurality of modules in them or step are made into the single integrated circuit module and realize.Like this, the present invention is not restricted to any specific hardware and software combination.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. content distributing network CDN server, be applied to the reciprocity Versatile content distributing network formed by a plurality of CDN servers, wherein, part or all of CDN server in described a plurality of CDN server is formed the reciprocity overlay network of described reciprocity Versatile content distributing network, described reciprocity overlay network adopts the positional information of the distributed storage mode memory contents of equity, it is characterized in that described CDN server comprises:
Receiver module is used to receive the request of subscriber equipment transmission by described reciprocity Versatile content distributing network download requests for content message;
Enquiry module is used for inquiring about by described reciprocity overlay network the positional information of the described content that described subscriber equipment asks;
Download module is used for the described positional information that inquires according to described enquiry module, downloads described content by described reciprocity Versatile content distributing network;
Sending module is used for described content is sent to described subscriber equipment.
2. CDN server according to claim 1 is characterized in that, described CDN server also comprises:
Judge module, be used to judge described CDN server whether buffer memory the described content of described user equipment requests, if, then trigger described sending module the described content of buffer memory sent to described subscriber equipment, otherwise, trigger described enquiry module.
3. CDN server according to claim 2 is characterized in that, described CDN server also comprises:
First cache module is used for the described content that the described download module of buffer memory is downloaded.
4. CDN server according to claim 3 is characterized in that, described CDN server also comprises:
Update module is used for utilizing the positional information of the described content that the reciprocity overlay network of the described reciprocity Versatile content distributing network of updating location information of described CDN server stores.
5. according to each described CDN server in the claim 1 to 4, it is characterized in that described enquiry module comprises:
Judging unit is used to judge whether described CDN server is cached with the positional information of described content, if then trigger the positional information that acquiring unit obtains the described content of buffer memory; Otherwise, trigger described acquiring unit obtains described content from described reciprocity overlay network positional information;
Described acquiring unit is used to obtain the positional information of the described content of buffer memory, or obtains the positional information of described content from described reciprocity overlay network.
6. CDN server according to claim 5 is characterized in that, described CDN server also comprises:
Second cache module is used for the described positional information of the described content that the described acquiring unit of buffer memory obtains from described reciprocity overlay network.
7. content download method, be used for downloading content from content delivering system by reciprocity Versatile content distributing network, wherein, described reciprocity Versatile content distributing network comprises a plurality of CDN servers, part or all of CDN server in described a plurality of CDN server is formed the reciprocity overlay network of described reciprocity Versatile content distributing network, described reciprocity overlay network adopts the positional information of the distributed storage mode memory contents of equity, and described method comprises:
The access CDN server of subscriber equipment receives the content requests from described subscriber equipment, wherein, carries the sign of the content of request to some extent in the described content requests;
Described access CDN server obtains the positional information of the corresponding described content of described sign by described reciprocity overlay network;
Described access CDN server download described content by described reciprocity Versatile content distributing network, and the described content that will download sends to described subscriber equipment according to described positional information.
8. method according to claim 7 is characterized in that, the positional information that described access CDN server obtains described content comprises:
Described access CDN server obtains the positional information of described content from described reciprocity overlay network.
9. method according to claim 7 is characterized in that, the positional information that described access CDN server obtains described content comprises:
Described access CDN server judges whether to be cached with the positional information of described content, if then obtain the positional information of the described content of buffer memory; Otherwise,
Described access CDN server obtains the positional information of described content from described reciprocity overlay network.
10. according to Claim 8 or 9 described methods, it is characterized in that described access CDN server obtained the positional information of described content from described reciprocity overlay network after, described method also comprised:
Described access CDN server determines not have the positional information of the described content of buffer memory, the positional information of the described content that buffer memory obtains from described reciprocity overlay network.
11. method according to claim 7 is characterized in that, before described access CDN server was downloaded described content, described method also comprised:
Described content that described access CDN server has judged whether buffer memory, if then the described content with buffer memory sends to described subscriber equipment, otherwise described access CDN server is carried out the operation of downloading described content.
12., it is characterized in that after described access CDN server was downloaded described content, described method also comprised according to claim 7 or 11 described methods:
Described access CDN server determines not have the described content of buffer memory, then the described content of buffer memory download.
13. method according to claim 12 is characterized in that, after the described content of described access CDN server buffer, described method also comprises:
The positional information of the described content of storing in the described reciprocity overlay network of described access CDN its updating location information of server by utilizing.
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