CN100377522C

CN100377522C - OMA download realizing method in content distributing network

Info

Publication number: CN100377522C
Application number: CNB2006100181426A
Authority: CN
Inventors: 邓荣华
Original assignee: Beijing Northern Fiberhome Technologies Co Ltd
Current assignee: Beijing Northern Fiberhome Technologies Co Ltd
Priority date: 2006-01-11
Filing date: 2006-01-11
Publication date: 2008-03-26
Anticipated expiration: 2026-01-11
Also published as: CN1801718A

Abstract

The present invention relates to a realizing method for an OMA download in a content distributing network, particularly to an OMA download in the distributing network. An OMA file to be downloaded by a mobile terminal is redirected to an edge server with the OMA file by the method that a redirection strategy of content delivery network service are adopted through a portal, and thus, the present invention solves the problem that all users download the OMA file by only designated edge server; thus, the present ensures the property of a highly efficient, reliable, load balancing intelligent network.

Description

The implementation method that OMA downloads in a kind of content distributing network

Technical field

The present invention relates in content distributing network, realize a kind of method of OMA (Open Mobile Alliance) download.Be specifically related to the generation and the issue of OMA file in download, and the OMA downloading process is handled.

Background technology

1, content distributing network

The thought of content distributing network is to rely on buffer memory and the media server of placing various places, intelligent load balancing and functional modules such as content distribution, scheduling by the system centre platform, that part of media content that the user is most interested in is deployed to the place near the user, make that unordered originally, poor efficiency, insecure broadband IP network are transformed into efficiently, reliable intelligent network, thereby satisfy the requirements at the higher level of user the media interviews quality.

When user capture has added the website of content distributing network server, at first determine simultaneously this node to be pointed in user's request near the node of user's best content distributing network by DNS (domain name mapping) redirecting technique or based on the load balancing strategy of four layer switch.When user's request arrived this node, the server of content distributing network (high-speed cache on the node) was responsible for the content of user's request is offered the user.The realization of content distributing network need rely on the support of multiple network technology, mainly comprises: load-balancing technique, dynamic content route, content caching mechanism, dynamic content distribution and duplicate, security service etc.

2, OMA download technology

OMA down load application pattern is on the basis that basic HTTP (HTML (Hypertext Markup Language)) downloads, some functions have been increased, comprise: the auxiliary tools that content negotiation is used, the metadata of being convenient to uniform format (with protocol-independent) are represented and application layer is installed and confirmed, provide better user experience with this.

In the reciprocal process of content negotiation, portable terminal at first obtains the Download Descriptor file of media object, according to the Download Descriptor file, the download agent of portable terminal can judge whether the present resource of terminal satisfies the requirement of downloaded media object, the mobile subscriber can reaffirm also whether content needs, thereby judges whether the media object that needs actual download to select.

Some attributes of Download Descriptor file allow download agent will describe the metadata of media object and the available resources of current customer equipment compare.Another kind of attribute allows the terminal use before downloading beginning, confirms to receive or reject the object of these medium.

The download transaction processing procedure always comprises uncertainty to a certain degree, and client and server blood sure the other side's transaction process are simultaneously finished.In the installation notification procedure that OMA downloads, exist Download Server not know that the client has received the situation of media object, in fact do not rejected, and server believes that customer equipment received the situation of media object by terminal but media object can not take place.

When Download Server is downloaded at handle mobile terminal OMA, can adopt the media object of Download Descriptor file and descriptor file appointment to send respectively, perhaps Download Descriptor and media object are combined in one and send transmission in the bag, in both of these case, according to the requirement in the Download Descriptor file, the notice of installation can be arranged, also can not have.

Realize that in content distributing network the OMA download should be noted that 2 points: the one, adopting DNS to be redirected in the network of realizing service-orientation, media object URL (universal resource location) and Notification URL is installed can not be comprised server domain name in the OMA Download Descriptor file finishes on same Download Server because DNS can not guarantee OMA download session process when being redirected; The 2nd, adopt four layer switch to realize can't realizing in the content distributing network of service-orientation that OMA downloads, because four layer switch do not have conversation management functional, can not guarantee an OMA download session is directed to same Download Server.

Existing OMA method for down loading is as follows:

1, the URL of media object file points to same Download Server in the OMA descriptor file;

2, the download of OMA descriptor file and media object file be not in same download server.The problem that existing OMA method for down loading exists is:

1, this OMA file of all user's download can only arrive a specified server download, and its shortcoming is: might cause the content distributing network load unbalanced, cause network blockage easily;

If 2 descriptor file and media object file not in same download server, can't get up this twice download with a session association.

Summary of the invention

The objective of the invention is to overcome the problem that prior art exists, provide and realize the implementation method that OMA downloads in a kind of content distributing network, this method can dynamically generate media file and the URL of notice is installed, can Download Descriptor file and media object file association in same session, give full play to the characteristic of the load balancing of content distributing network.

Technical scheme of the present invention is: the implementation method that OMA downloads in a kind of content distributing network, it is characterized in that: for the OMA media files downloaded, encoder server also generates the descriptor file about this media object when generating this media object, but the URI of media object the inside only comprises the relative path that media file is preserved in this descriptor file, does not comprise the domain name of Download Server or the IP and the port numbers of Download Server;

Content uploading server FTP uploads to this media object and descriptor file in the content library of central server, the content library of Business Management Platform retrieval center server is formulated distribution policy, central server according to this strategy this media object and descriptor file PUSH together to the edge Download Server;

When the edge Download Server in the content distributing network received descriptor file and media object file, the edge Download Server replenished descriptor file complete, and added the absolute URI path that notice is installed.

In content distributing network, there are a plurality of duplicates in same file in the Edge Server of zones of different, if when generating the media descriptor handling file, in the media descriptor handling file about the URL of media object and URL that notice is installed all be fixed as one immutable, so all portable terminals can only go to download to this specified server, other server just can't be handled the download of this OMA file, and this just disagrees with the feature of content distributing network.And adopt method of the present invention that the advantage of content distributing network is given full play of, bring favorable experience to the client.

Aforesaid method is characterized in that comprising the following steps:

1, encoder server generates the OMA file, and wherein the URL of the media object file in the OMA descriptor file is relative URL;

2, the central server in the content distributing network sends the OMA file to each edge Download Server, the edge Download Server receives the OMA file, and be the media object filling in documents of OMA descriptor file absolute URL, absolute URL points to this machine, and adds the URL that notice is installed;

When 3, process user is downloaded, point to this machine, and hand in the URL that notice is installed retroactively if the URL of the media object file in the descriptor file is relative absolute, the absolute URL that just extends this as.

Beneficial effect of the present invention:

Can give full play to the performance of content distributing network load balancing, make network unobstructed, fully guaranteed distributing network efficiently, reliably, the characteristic of the intelligent network of load balancing.

Principle of the present invention is:

The OMA file in download includes media object and media descriptor handling file, terminal is the downloads of media descriptor file at first, in the descriptor file that obtains, obtain the URL of media object and send the URL that notice is installed, URL comes downloaded media object by media object, sends the installation notice by Notification URL is installed to Download Server.

In content distributing network, for the OMA media files downloaded, encoder server also generates the descriptor file about this media object when generating this media object, but the method for taking when this descriptor file generates is only to generate a part, just the URI of media object the inside only comprises the relative path that media file is preserved, do not comprise the domain name of Download Server or the IP and the port numbers of Download Server, terminal obtains this descriptor file can't download corresponding media object, and the descriptor file content class of generation is like as follows:

<media?xmlns＝″http://www.openmobilealliance.org/xmlns/dd″>

<type>image/jpeg</type>

</media>

Content uploading server FTP uploads to this media object and descriptor file in the content library of central server, the content library of Business Management Platform retrieval center server is formulated distribution policy, central server according to this strategy this media object and descriptor file PUSH together to the edge Download Server.When portable terminal when door is browsed, if mobile client is interested in this media object, click the descriptor file of downloading this media object, door is selected Edge Server according to content distributing network service redirection strategy, like this when terminal is clicked the Download Descriptor file, door just is redirected to this edge Download Server to the URL that descriptor file is downloaded, the edge Download Server is when handling this descriptor file of download, revise this descriptor file, fill the URL of the media object of descriptor file complete, and add the URL that notifies is installed, perhaps the edge Download Server is in receiving media object and media descriptor handling file, the URL of the media object of media descriptor handling file is filled complete, and adding the URL that notice is installed, to form new descriptor file as follows:

<？xml?version＝″1.0″encoding＝″UTF-8″？>

<media?xmlns＝″http://www.openmobilealliance.org/xmlns/dd″>

<type>image/jpeg</type>

<installNot?ifyURI>http://192.168.3.203:9090/installnotify</installNotifyURI>

</media>

Portable terminal obtains the downloaded media object that this descriptor file just can be real like this, and sends the installation notice to Download Server.

Description of drawings

Fig. 1 is the general structure block diagram of control forms of the present invention.

Fig. 2 be embodiments of the invention be generated to the FB(flow block) of PUSH from the OMA file to Edge Server.

Fig. 3 is the FB(flow block) that the portable terminal of embodiments of the invention is downloaded the OMA file.

Embodiment

Describe the present invention in detail below in conjunction with accompanying drawing.

As shown in Figure 1, native system is made up of following equipment: encoder server 101, content uploading ftp server 102, door 103, central server 104, Business Management Platform server 105, WAP gateway 108, Edge Server.

Wherein 101 pairs of media object of encoder server are carried out necessary code conversion or format conversion and are generated the media descriptor handling file; Content uploading ftp server 102 with media descriptor handling file and encoding process after media object upload to the content library of central server 104; Business Management Platform server 105 is formulated distribution schedule creation according to the content library of central server 104, and media descriptor handling file in central server 104 content library and media object are distributed to Edge Server together; Each Edge Server 110 (111) is responsible for the download request of handle mobile terminal 106, and the installation of portable terminal 106 notice; Door 103 provides the authentication of portable terminal 106, and the content in the system is presented to the user; WAP gateway 108 provides the mobile subscriber to pass through the ability of mobile network's connecting system.

As shown in Figure 2, the generation of OMA media descriptor handling file and distribution flow:

Encoder server 201 generates the media object of OMA 210 files and the descriptor file of medium;

The OMA file that content uploading ftp server 202 generates coding uploads 211 in the content library of central server 204;

The content library of 205 pairs of central servers 204 of Business Management Platform is retrieved the distribution schedule creation 212 of formulating the OMA file in download;

Central server 204 arrives Edge Server 207 (208) according to the distribution schedule creation of Business Management Platform 205 by IP network PUSHOMA file 216, Edge Server 207 (208) also can pass through IP network PULL OMA file 215, when Edge Server 207 (208) receives the OMA file, can revise the descriptor file of OMA file, the media object URL of descriptor file is filled the IP address and the port of book server, add the http protocol header before the IP address, and add the installation Notification URL, IP address and port that the URL of notice is installed also are book servers, and media object and installation notice all have absolute URL like this;

Door 203 obtains fileinfo 214 by the content library of central server 204, generates browsing information and presents to terminal.

As shown in Figure 3, the flow process of terminal downloads OMA file:

Portable terminal 302 is browsed door 301 information by WAP gateway 304;

Mobile phone users 302 is found interested content, clicks the page and initiates download request;

Door 301 dynamically generates URL according to the service redirection strategy of content distributing network, points to the media descriptor handling file in certain Edge Server 305 (306), and door 301 sends this OMA file in download URL 312 to mobile phone users 302;

Mobile phone users 302 is initiated service request downloads of media descriptor file 313 by WAP gateway 304 to Edge Server 305 (306);

Edge Server 305 (306) is when handling the downloads of media descriptor file, find when descriptor file is imperfect descriptor file to be filled complete, solution is the IP address and the port of media object URL wherein being filled book server, front, IP address adds the http protocol header, and add the installation Notification URL, IP address and port that the URL of notice is installed also are book servers, and amended content is sent to mobile phone users 302 by responding 314;

Mobile phone users 302 obtains the URL of downloaded media object by the media descriptor handling file that obtains, and initiates request downloaded media object 313 to same Edge Server;

After media object was downloaded and finished, mobile phone users 302 sent to Download Server according to the installation Notification URL in the descriptor file notification message 313 is installed.

Claims

1. the implementation method that OMA downloads in the content distributing network, it is characterized in that: for the OMA media files downloaded, encoder server also generates the descriptor file about this media object when generating media object, but the URI of media object the inside only comprises the relative path that media file is preserved in this descriptor file, does not comprise the domain name of Download Server or the IP and the port numbers of Download Server;

When the edge Download Server in the content distributing network receives descriptor file and media object file, relative URI about the media object file in the descriptor file is revised as absolute URI, and add the absolute URI path that notice is installed and form new descriptor file, absolute URI points to this machine.