CN101600079A - High-speed downloads system and method for down loading based on cable TV network - Google Patents
High-speed downloads system and method for down loading based on cable TV network Download PDFInfo
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Abstract
The present invention proposes a kind of high-speed downloads system and method for down loading based on cable TV network, and its system comprises application service module, terminal module and schedule process module.The service that application service module is used to the network user to provide file to download.Terminal module links to each other with application service module by the Internet, is used for by the Internet browser application service module, and selects the downloaded files of wanting.Schedule process module links to each other with application service module, and be connected to terminal module by cable TV network, be used for the terminal module information of obtaining according to application service module and the downloaded files information of wanting thereof, file content is encoded into a document flow, and is transferred to terminal module by cable TV network.The present invention can realize the high-speed downloads of big capacity documents.
Description
Technical field
The present invention relates to download system and method for down loading, particularly based on the high-speed downloads system and the method for down loading of cable TV network.
Background technology
Along with the Internet is more and more universal, broadband user's number of China also increases progressively on a large scale, and the data of announcing according to Britain PointTopic research firm show, by to 2008 8 the end of month, China broadband user number has reached 7,800 ten thousand, is the maximum country of world's broadband user's number.
In China, the broadband service that provides for the user mainly contains two classes, and a class is based on communication network, the another kind of cable TV network that is based on.
Based on the broadband service of communication network is our the daily ADSL that contacts (Asymmetric DigitalSubscriber Line, Asymmetrical Digital Subscriber Line) online, uploading or downloading all is to be undertaken by telephone wire, user side has a Modem equipment (modulator-demodulator), is used for the modulating/demodulating digital signal.
Based on the download service of cable TV network is our daily cable modem that contacts, CNN by each different cities is released, at user side a Modem equipment is arranged also, be Cable Modem (cable modem), front end adopts CMTS (Cable Modem Termination System, Cable Modem Terminal System) equipment is handled the signal that Cable Modem transmits up, inserts the Internet backbone network then.
Above-mentioned two kinds of broadband services, according to varying in size of bandwidth, expense is also different, and bandwidth is big more, and monthly expense is just high more.With the broadband that the 4M broadband is come, the average speed of download of communication network and cable TV network is about 400Kb/s, and the monthly expense of communication network is about 100RMB-120RMB, and the monthly expense of cable TV network is between 80RMB-100RMB.
This shows that existing broadband services, its speed of download all can not be satisfactory.With the high-definition movie of downloading a 4GBytes is example, and the speed of download of 400Kb/s has been downloaded such high-definition movie to be needed more than 23 hours, just one day one night.Not only expend a large amount of time and expenses of surfing Internet, and must make computer be in open state for a long time, also consumed a large amount of electric energy and power consumption, do not meet the environmental protection theory that country advocates.And if make the broadband reach the bandwidth of the average speed of download about 4Mb/s, then monthly expense is to reach more than the 1000RMB.
In sum, under current network environment, download big capacity documents and have the shortcoming that the time is long, expense is high.
Summary of the invention
The purpose of this invention is to provide a kind of high-speed downloads system, to solve under the current network environment problem that file downloading speed is slow, expense is high based on cable TV network.
Another object of the present invention provides a kind of high-speed downloads method based on cable TV network, to solve under the current network environment problem that file downloading speed is slow, expense is high.
The present invention proposes a kind of high-speed downloads system based on cable TV network, and it comprises application service module, terminal module and schedule process module.The service that application service module is used to the network user to provide file to download.Terminal module links to each other with application service module by the Internet, is used for by the Internet browser application service module, and selects the downloaded files of wanting.Schedule process module links to each other with application service module, and be connected to terminal module by cable TV network, be used for the terminal module information of obtaining according to application service module and the downloaded files information of wanting thereof, file content is encoded into a document flow, and is transferred to terminal module by cable TV network.
According to the described high-speed downloads system based on cable TV network of preferred embodiment of the present invention, schedule process module comprises download schedule server, content server and plug-flow server again.The download schedule server links to each other with application service module, is used to accept terminal module information and the fileinfo that application service module sends, and matches terminal module corresponding address and frequency point information.Content server links to each other with application service module, is used for the file data of storage application service module.The plug-flow server links to each other with download schedule server and content server respectively, be used for the fileinfo that sends according to the download schedule server, from content server, take out the corresponding file data, and, file data is encapsulated the back is broadcast to cable TV network by fiber optic network corresponding address according to the address and the frequency point information of terminal module.
According to the described high-speed downloads system of preferred embodiment of the present invention based on cable TV network, schedule process module also comprises scrambler, it links to each other with the download schedule server, be used to form a scrambling control word, and give the plug-flow server, and file data is carried out scrambling by the download schedule Server Transport.
According to the described high-speed downloads system based on cable TV network of preferred embodiment of the present invention, content server links to each other by gigabit ethernet interface with the plug-flow server.
According to the described high-speed downloads system based on cable TV network of preferred embodiment of the present invention, terminal module comprises PC and downloader again.PC is connected to the Internet, is used to provide internet browsing function, and selects to want downloaded files from application service module.Downloader links to each other with PC, and is connected to cable TV network, is used to receive the document flow of coming from the cable TV network transmission, and is transferred to PC.
According to the described high-speed downloads system of preferred embodiment of the present invention, comprise IPQAM equipment, multiplexer, modulator and blender in the cable TV network again based on cable TV network.IPQAM equipment links to each other with schedule process module, is used for the transmission stream of schedule process module output is unpacked.Multiplexer links to each other with schedule process module, is used for the file data after unpacking is multiplexed into a document flow.Modulator links to each other with multiplexer, is used for the document flow of multiplexing mistake is modulated into radiofrequency signal.Blender links to each other with IPQAM equipment, modulator and terminal module respectively, is used for incorporating radiofrequency signal into cable TV network, and transfers to terminal module.
The present invention proposes a kind of high-speed downloads method based on cable TV network in addition, may further comprise the steps: at first, at the head end machine room of cable TV network schedule process module is set.Next, the terminal module that schedule process module is accepted in the network need to select downloaded files information by the Internet.Then, schedule process module will need the downloaded files content to encode, and form after the document flow multiplexing to cable TV network.At last, schedule process module together transfers to terminal module with file content and cable TV signal by cable TV network.
According to the described high-speed downloads method of preferred embodiment of the present invention based on cable TV network, also further may further comprise the steps after file content is transferred to terminal module by cable TV network: at first, terminal module carries out decapsulation, scramble process to file content.Then, terminal module file in download.
According to the described high-speed downloads method of preferred embodiment of the present invention, when being encoded, file content may further comprise the steps: at first, go out its corresponding address and frequency point information according to the information matches of terminal module based on cable TV network.Then, address and frequency point information according to terminal module encapsulate file data.
According to the described high-speed downloads method of preferred embodiment of the present invention, when being encapsulated, file data also comprises step: at first, form the scrambling control word based on cable TV network.Then, encapsulate after utilizing the scrambling control word to the file data scrambling.
The invention has the beneficial effects as follows:
1, the present invention utilizes cable TV network to carry out the transmission of data, because data descending is to take the mode broadcasted in the cable TV network, it can use free time or independent frequency to carry out the descending propelling movement of packing of data, maximum bandwidth can reach 38Mb/s, improved the speed of download of user terminal file greatly, also reduced user's consumed time when downloading big capacity documents, and the electric energy that consumes when reducing booting computer.
2, system schema of the present invention is under the existing cable TV network environment, has only added a downloader at user side, need not transform existing network, so system configuration is simple again, and construction cost is low, has very strong practicality.
3, the present invention utilizes existing cable TV network to finish the transmission of data flow, its month usage charges only be 120RMB-130RMB, when realizing high-speed downloads, but have cheap expense expenditure, be fit to the use of average family.
Certainly, implement arbitrary product of the present invention and must not necessarily need to reach simultaneously above-described all advantages.
Description of drawings
Fig. 1 is a kind of high-speed downloads system construction drawing based on cable TV network of the embodiment of the invention;
Fig. 2 is the high-speed downloads system construction drawing of the another kind of the embodiment of the invention based on cable TV network;
Fig. 3 is a kind of high-speed downloads method flow diagram based on cable TV network of the embodiment of the invention;
Fig. 4 is the high-speed downloads method flow diagram of the another kind of the embodiment of the invention based on cable TV network.
Embodiment
Principle of the present invention is to utilize the downlink broadcast frequency range of cable TV network to transmit to need downloaded files, thereby reaches the purpose of high-speed downloads.
Below in conjunction with accompanying drawing, specify the present invention.
See also Fig. 1, it is a kind of high-speed downloads system construction drawing based on cable TV network of the embodiment of the invention.This system comprises application service module 103, terminal module 105 and schedule process module 107.The service that application service module 103 is used to the network user to provide file to download, it can be the website of one or more application servers, as potato net, a sudden peal of thunder etc.Terminal module 105 is arranged in the subscriber household, and it links to each other with application service module 103 by the Internet 109, is used for by the Internet 109 browse application service modules 103, and selects the downloaded files of wanting.Schedule process module 107 is arranged in the machine room of cable television operators head end, it links to each other with application service module 103, and be connected to terminal module 105 by cable TV network 111, be used for terminal module 105 information of obtaining according to application service module 103 and the downloaded files information of wanting thereof, file content is encoded into a document flow, and is transferred to terminal module 105 by cable TV network 111.
With respect to the point-to-point downloading mode in traditional the Internet, because data descending is to take the mode broadcasted in the cable TV network, it can use free time or independent frequency to carry out the descending propelling movement of packing of data, maximum bandwidth can reach 38Mb/s, that is to say, terminal module 105 maximum speeds of download of the present invention can reach 38Mb/s, for the network download ability has been brought lifting.
See also Fig. 2, it is the high-speed downloads system construction drawing of the another kind of the embodiment of the invention based on cable TV network.This system comprises application service module 103, terminal module 105 and schedule process module 107.Terminal module 105 comprises PC 203 and downloader 205, and PC 203 inserts the Internet by ADSL (AsymmetricDigital Subscriber Line, Asymmetrical Digital Subscriber Line) or Cable Modem modes such as (cable modems).Downloader 205 links to each other with cable TV network 111.Link to each other by the USB line between PC 203 and the downloader 205.
Comprise IPQAM equipment 217, multiplexer 219, modulator 221 and blender 223 in the cable TV network 111 of Fig. 2 again.IPQAM equipment 217 collection " multiplexing, scrambling, modulation, frequency translation " function is an one, and it is that the TS Over IP stream that will import in the optical fiber interface unpacks, and is reduced into TS (Transport Stream transmits) stream.Multiplexer 219 is used for a plurality of single-unit order TS streams or Polymera TS stream, and multiple connection is a Polymera TS stream that comprises these content code streams.Modulator 221 links to each other with multiplexer 219, is used for the baseband signal of TS stream is modulated to carrier wave, and output RF signal.Blender 223 links to each other with IPQAM equipment 217, modulator 221 and downloader 205 respectively, be used for inserting one road signal, and can not cause the change of original system TV signal index in original cable television system (cooperating modulator, filter or trapper).
A complete system downloads process is as follows: user's PC 203 is connecting a downloader 205 by the USB line, and the cable TV signal line is followed in downloader 205 other ends.The user browses the application server 207 of appointment on the Internet 109 (this application provider belongs to specific provider, did integrated with cable television operators head end machine room, that is to say that the content in this application server 207 has been integrated in the content server 213), after the user signs in to this application server 207, when click downloading a certain big capacity documents, application server 207 is forwarded to download schedule server 209 with user's information such as ID, the frequency that download schedule server 209 is downloaded according to user's information distribution such as ID, transmission channel, the scrambling control word, the download stream propelling movement time etc., and arrange the scheduling of download stream in cable TV network 111, simultaneously relevant information is back to user's PC 203 by application server 207.The big capacity documents that plug-flow server 213 provides application server 207 is carried out TS (Transport Stream) coding, and multiplexing to cable TV network after the scrambling of use control word, transfers in the user family jointly with cable TV signal.Software small routine on user's PC 203 is sent to downloader 205 with information such as frequency, scrambling control words, and waits the reception of download stream according to operation plan.Downloader 205 is tuned to specifies frequency and passage, receives the download stream that pushes, and according to behind the control word descrambling demultiplexing, exports the TS clear stream on the PC 203 preservation by USB interface, finishes download.
For the ease of understanding, below in conjunction with Fig. 2, be example with the high-definition movie of user's download that stays in the A sub-district, introduce the technology realization of each main modular inside and the communication between the module in detail.
The PC 203 of user terminal can link to each other with downloader 205 by the USB line, and downloader 205, USB line and PC 203 need to support high speed USB 2.0 that promptly transmission rate can reach 480Mbit/s.Downloader 205 has a wired network interface, is connecting cable TV network 111.The little software of special use is installed on the PC 203, is used to handle the relevant matters of high-speed downloads,,, and receive download stream that downloader 205 transmits etc. with downloader 205 communications as file download management, user interface.User's PC 203 inserts the Internet 109 by modes such as ADSL or Cable Modem, the website of access application server 207 (as potato net, a sudden peal of thunder etc.).
Download schedule server 209 at first verifies according to the User Information Database of self maintained whether this user is legal, as illegal, then directly returns failure information to this application server 209.Pass through as checking, then take out the Region ID (area I D) that this user belongs to, and to the scheduling (as plug-flow immediately, still being plug-flow after 5 minutes) of ranking of user's download request.When being dispatched to this user, download schedule server 209 matches the IPQAM of this user's correspondence, and obtains IP address (for example 192.168.10.118), frequency point information (for example 792MHz) of IPQAM etc.Download schedule server 209 is sent to plug-flow server 215 with information such as film information, IPQAM IP and frequencies, and is sent to plug-flow server 215 in the lump from scrambler 211 CW of application (Control Word, scrambling control word).Meanwhile, download schedule server 209 is back to application server 207 with information such as this user's download frequency points corresponding, CW, scheduling, is back to user's PC 203 by application server 207.
Plug-flow server 215 takes out these substance films according to film information from content server 213, carry out scrambling with CW after, encapsulate in MPEG-2TS over IP mode, be broadcast to the IPQAM of assigned ip address in the cable TV transmission network network by fiber optic network.Substance film in the content server 213 is provided by application server 207, in order to ensure user's request answer speed, generally be placed on cable TV network 111 head ends, with plug-flow server 215 usefulness GE (Gigabit Ethernet, gigabit Ethernet) interface links to each other, and need are irregular and application service provider's content library is synchronous.
Here said MPEG-2TS is the flow transmission standard that field of broadcast televisions extensively adopts, the MPEG-2TS standard definition method of multiplexing one or more audio frequency, video and streams of data elements.For being applied to the IP network transmission, media data by the ICP/IP protocol stack, is packaged into the IP packet, i.e. MPEG-2TS over IP traffic after encapsulating through MPEG-2TS again.MPEG-2TS over IP traffic transport protocol stack is as shown in table 1:
Table 1
In the table 1, media data flow is packaged, adds time marking, can store and transmit the single output TS stream of application by element flow (PES) packing and multiplexing back formation.The TS bag is made up of packet header, self adaptation district and bag data 3 parts.Because each packet length is 188 fixing bytes, after being packaged into UDP bag and IP bag, need to consider suitable packet length.With ISMA (Internet Streaming Media Alliance, internet stream media) difference, MPEG-2 TS over IP mode be with look, the multiplexing back of voice data is being packaged into the TS bag, so output stream is single.
In the transmission course of MPEG-2 TS over IP traffic, IPQAM equipment 217 is indispensable parts, and it is arranged in the end of cable TV network 111 optical nodes.It unpacks the TS Over IP stream of importing in the optical fiber interface, be reduced into TS stream after, undertaken multiplexingly again by multiplexer 219, be modulated into of frequency and the RF delivery outlet output of RF signal through modulator 221 then in appointment.RF signal after the output is incorporated wired network into by blender 223, and broadcast transmitted is to user family then.
Downloader 205 is according to parameters such as the frequency that passes over from user's PC 203, CW, be tuned to and specify frequency (for example 792MHz) to carry out the reception of data flow, receive the back and carry out descrambling/demultiplexing according to CW, after obtaining clean TS stream, transport to PC 203 by the USB oral instructions and carry out the storage of file in download.So just, finished whole downloading process.
Because the bandwidth when utilizing cable TV network 111 to carry out transfer of data can reach 38Mb/s, and its month usage charges only be 120RMB-130RMB, therefore shortened the download time of big capacity documents greatly, make the user when enjoying high-speed downloads, also reduced the available machine time of computer, therefore the loss of having saved electric energy further.
The present invention proposes a kind of high-speed downloads method based on cable TV network in addition, and as shown in Figure 3, it may further comprise the steps:
S301 is provided with schedule process module at the head end machine room of cable TV network.
Schedule process module is used for the file content that cable TV network transmits is encoded into data flow, and matching transport address and transmission frequency, it can be to be combined by a plurality of function servers such as download schedule server, content server and plug-flow servers.
S303, the terminal module that schedule process module receives in the network need to select downloaded files information by the Internet.Here said file can be jumbo files such as the various videos propagated on the Internet, audio frequency, recreation.
S305, schedule process module will need the downloaded files content to encode, and form after the document flow multiplexing to cable TV network.
S307, schedule process module together transfers to terminal module with file content and cable TV signal by cable TV network.
See also Fig. 4, it is the high-speed downloads method flow diagram of the another kind of the embodiment of the invention based on cable TV network.
S401 is provided with schedule process module at the head end machine room of cable TV network.
S403, the terminal module that schedule process module is accepted in the network need to select downloaded files information by the Internet.
S405 forms the scrambling control word.
S407 utilizes the scrambling control word that file data is carried out scrambling.
S409 goes out its corresponding address and frequency point information according to the information matches of terminal module.
S411, address and frequency point information according to terminal module encapsulate file data, and form after the document flow multiplexing to cable TV network.
S413, schedule process module together transfers to terminal module with file content and cable TV signal by cable TV network.
S415, terminal module carries out decapsulation, scramble process to file content.
S417, the terminal module file in download.
With respect to prior art, the present invention has the following advantages:
1, the present invention utilizes cable TV network to carry out the transmission of data, because data descending is to take the mode broadcasted in the cable TV network, it can use free time or independent frequency to carry out the descending propelling movement of packing of data, maximum bandwidth can reach 38Mb/s, improved the speed of download of user terminal file greatly, also reduced user's consumed time when downloading big capacity documents, and the electric energy that consumes when having reduced booting computer.
2, system schema of the present invention is under the existing cable TV network environment, has only added a downloader at user side, need not transform existing network, so system configuration is simple again, and construction cost is low, has very strong practicality.
3, the present invention utilizes existing cable TV network to finish the transmission of data flow, its month usage charges only be 120RMB-130RMB, when realizing high-speed downloads, but possessed cheap expense expenditure, be fit to the use of average family.
More than disclosed only be several specific embodiment of the present invention, but the present invention is not limited thereto, any those skilled in the art can think variation, all should drop in protection scope of the present invention.
Claims (10)
1, a kind of high-speed downloads system based on cable TV network is characterized in that, comprising:
One application service module, the service that is used to the network user to provide file to download;
One terminal module, it links to each other with this application service module by the Internet, is used for by this application service module of internet browsing, and selects the downloaded files of wanting;
One schedule process module, it links to each other with this application service module, and be connected to this terminal module by cable TV network, be used for the terminal module information of obtaining according to this application service module and the downloaded files information of wanting thereof, file content is encoded into a document flow, and is transferred to this terminal module by cable TV network.
2, the high-speed downloads system based on cable TV network as claimed in claim 1 is characterized in that this schedule process module comprises again:
One downloads dispatch server, and it links to each other with this application service module, is used to accept this terminal module information and fileinfo that this application service module sends, and matches this terminal module corresponding address and frequency point information;
One content server, it links to each other with this application service module, is used to store the file data of this application service module;
One plug-flow server, it links to each other with this download schedule server and this content server respectively, be used for the fileinfo that sends according to this download schedule server, from this content server, take out the corresponding file data, and, file data is encapsulated the back is broadcast to cable TV network by fiber optic network corresponding address according to the address and the frequency point information of this terminal module.
3, the high-speed downloads system based on cable TV network as claimed in claim 2, it is characterized in that, this schedule process module also comprises a scrambler, it links to each other with this download schedule server, be used to form a scrambling control word, and give this plug-flow server, and file data is carried out scrambling by this download schedule Server Transport.
4, the high-speed downloads system based on cable TV network as claimed in claim 2 is characterized in that, this content server links to each other by gigabit ethernet interface with this plug-flow server.
5, the high-speed downloads system based on cable TV network as claimed in claim 1 is characterized in that this terminal module comprises again:
One PC, it is connected to the Internet, is used to provide internet browsing function, and selects to want downloaded files from this application service module;
One downloader, it links to each other with this PC, and is connected to cable TV network, is used to receive the document flow of coming from the cable TV network transmission, and is transferred to this PC.
6, the high-speed downloads system based on cable TV network as claimed in claim 1 is characterized in that, comprises again in this cable TV network:
One IPQAM equipment, it links to each other with this schedule process module, is used for the transmission stream of this schedule process module output is unpacked;
One multiplexer, it links to each other with this schedule process module, is used for file data is multiplexed into a document flow;
One modulator, it links to each other with this multiplexer, is used for the document flow of multiplexing mistake is modulated into radiofrequency signal;
One blender links to each other with this IPQAM equipment, this modulator and this terminal module respectively, is used for incorporating radiofrequency signal into cable TV network, and transfers to this terminal module.
7, a kind of high-speed downloads method based on cable TV network is characterized in that, may further comprise the steps:
Head end machine room at cable TV network is provided with a schedule process module;
The terminal module that schedule process module is accepted in the network need to select downloaded files information by the Internet;
Schedule process module will need the downloaded files content to encode, and form after the document flow multiplexing to cable TV network;
Schedule process module together transfers to terminal module with file content and cable TV signal by cable TV network.
8, the high-speed downloads method based on cable TV network as claimed in claim 7 is characterized in that, also further may further comprise the steps after file content is transferred to terminal module by cable TV network:
Terminal module carries out decapsulation, scramble process to file content;
The terminal module file in download.
9, the high-speed downloads method based on cable TV network as claimed in claim 7 is characterized in that, may further comprise the steps when file content is encoded:
Information matches according to terminal module goes out its corresponding address and frequency point information;
Address and frequency point information according to this terminal module encapsulate file data.
10, the high-speed downloads method based on cable TV network as claimed in claim 9 is characterized in that, also comprises step when file data is encapsulated:
Form a scrambling control word;
Encapsulate after utilizing this scrambling control word to the file data scrambling.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102006516A (en) * | 2010-10-18 | 2011-04-06 | 中山大学 | Digital household content service transmission method based on cable television two-way access |
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| CN100405842C (en) * | 2003-07-07 | 2008-07-23 | 崔竞飞 | TV program information data interchanging service system and data interchanging method |
| CN200944637Y (en) * | 2006-08-17 | 2007-09-05 | 于爱和 | Two-way wireless remote controller of digital television |
| CN101068303A (en) * | 2006-09-13 | 2007-11-07 | 深圳易拓科技有限公司 | Hardware enciphering method used for wired television system set-top box |
| CN101179686A (en) * | 2006-11-10 | 2008-05-14 | 王金双 | Cable television network based information delivery and play system |
| CN101188711A (en) * | 2007-12-19 | 2008-05-28 | 康佳集团股份有限公司 | A TV value-added service system and its implementation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102006516A (en) * | 2010-10-18 | 2011-04-06 | 中山大学 | Digital household content service transmission method based on cable television two-way access |
| CN102006516B (en) * | 2010-10-18 | 2013-07-24 | 中山大学 | Digital household content service transmission method based on cable television two-way access |
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