CN103402229A - Data downloading method and data downloading system - Google Patents
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- CN103402229A CN103402229A CN2013103167327A CN201310316732A CN103402229A CN 103402229 A CN103402229 A CN 103402229A CN 2013103167327 A CN2013103167327 A CN 2013103167327A CN 201310316732 A CN201310316732 A CN 201310316732A CN 103402229 A CN103402229 A CN 103402229A
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Abstract
The invention relates to a data downloading method and a data downloading system. The data downloading method is used for downloading data from a cellular network and comprises the following steps that to-be-downloaded original data are divided into multiple original data fragments, and random linear coding is performed on each original data fragment, so as to obtain multiple coded fragments; a first smart mobile device downloads partial coded fragments of the original data from a content server of the cellular network; the first smart mobile device acquires the residual coded fragments of the original data from at least one second smart mobile device with the coded fragments of the original data by virtue of near field communication, and the residual coded fragments and the partial coded fragments constitute the whole coded fragments of the original data; the first smart mobile device performs random linear decoding on the obtained whole coded fragments of the original data so as to recover the original data. The data downloading method and the data downloading system can be used for reducing the cellular network flow use amount of the smart mobile devices.
Description
Technical field
The present invention relates to the communications field, relate in particular to a kind of data download method and system.
Background technology
In recent years, the Intelligent mobile equipments such as mobile phone and panel computer infiltrate widely in daily life, and move (Cellular Networks) user and more and more thirst for accessing Internet whenever and wherever possible, and the factor of this two aspect causes the flow of Cellular Networks to explode.The prediction of Cellular Networks operator was from 2009 to 2014, and the Cellular Networks flow in the whole world will promote 39 times, and flow will reach 3.6 Chinese mugwort bytes per month when the time comes.The demand of bandwidth is existing 3G and the 4G standard amount that can provide head and shoulders above.Therefore Cellular Networks is overload operation, and service quality also will worsen.In order to alleviate the cellular network congested problem, researcher and network provider have been attempted the flow of cellular network is unloaded to the WLAN (wireless local area network) based on WiFi and piconet (Femtocell).Yet because coverage rate is limited, and the installation and maintenance cost is high, causes these networks to fail to be widely used.There is research work to point out that the flow of cellular network has larger repeatability, in some contents that are downloaded of buffer memory on base station, can reduce by 40% base station and the flow between Internet.But this mechanism can't reduce the flow between base station and mobile device.
There is a lot of non real-time application on mobile device, as the download of popular video and music file, software upgrading etc.There is the scholar to utilize the delay-tolerant characteristics design cellular network flow unloading mechanism of these application.They propose the content that buffer memory has been downloaded on mobile device, and the opportunistic communication when meeting between mobile device carries out content and shares, and then reaching the data volume that minimizing is directly downloaded by Cellular Networks, this class mechanism is called as the cooperation download mechanism based on opportunistic network.It is contemplated that such scene, the popular video content every day on YouTube and the excellent website such as cruel may the mobile device access thousands of times., if these data are all downloaded (as shown in Fig. 1 (a)) by cellular network, will consume a large amount of bandwidth.Based on the cooperation download mechanism of opportunistic network,, by forming opportunistic network between mobile device, unload download, as shown in Fig. 1 (b), at first, the video that server is popular with certain sends to some mobile devices selectively.Then, when mobile device met, the mobile device that has this video will be the neighbours of this transmission of video to it.By such opportunistic communication, this video little by little propagates into all mobile devices from the several source devices that start.Some nearest research work show the flow expense that can effectively reduce Cellular Networks based on the cooperation download mechanism of opportunistic network.
Yet, the existing download mechanism of cooperation based on opportunistic network all simply hypothesis to be downloaded the data volume of content very little, content is done as a whole the transmission in the Data dissemination process, and thought that this content can intactly be transmitted when once meeting arbitrarily.These hypothesis may be set up in the past, but due to the constantly increase of data volume size of the upper various popular contents of Internet in recent years, these hypothesis have become unreasonable.For example, in 2010, the mean size of the video segment that YouTube upper every day is the most popular surpassed 10MB.And for example, 2012, the mean size of the software of the upper download rank front 20 of iTunes was near 300MB.Take bluetooth 2.0 as example, its maximum throughput is 100KB/s, and the content of transmission 30MB needs 5 minutes at least.On the other hand, due to the short distance characteristics of the wireless communication technology of using in people's mobility and opportunistic network, the time length ratio that makes people at every turn meet is shorter.By analyzing in International Academic Conference, the data of meeting between participant's mobile device, found duration of meeting of 60% lower than 8 seconds, and the duration of meeting near 80% was lower than 2 minutes.The reality of comprehensive above-mentioned two aspects, be not difficult to find out that the hypothesis of existing cooperation download mechanism based on opportunistic network becomes and has been false.Therefore, in actual applications, existing cooperation download mechanism is difficult to reach the performance that they are claimed.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of data download method and system, reduces the data traffic of cellular network.
For solving the problems of the technologies described above, the present invention proposes a kind of data download method, be used for from the Cellular Networks downloading data, comprising:
Step a, the initial data that the content server of Cellular Networks will be downloaded is divided into a plurality of initial data bursts, each described initial data burst is carried out the stochastic linear coding, obtain a plurality of coded slices, each coded slices comprises the partial information of all initial data bursts;
Step b, download the first Intelligent mobile equipment of described initial data and download the part coded slices of described initial data from the content server of Cellular Networks;
step c, described the first Intelligent mobile equipment is by short-range communication, obtain the residue coded slices of described initial data from least one second Intelligent mobile equipment of coded slices with described initial data, described residue coded slices and described part coded slices form whole coded slices of described initial data, described the second Intelligent mobile equipment is downloaded part coded slices and the storage of described initial data in advance from the content server of Cellular Networks, and the part coded slices that described the second Intelligent mobile equipment is downloaded is different from the part coded slices that described the first Intelligent mobile equipment is downloaded,
Steps d, described the first Intelligent mobile equipment carries out the stochastic linear decoding to whole coded slices of the described initial data of acquisition, recovers described initial data.
Further, above-mentioned data download method also can have following characteristics, and step b comprises:
If total number of the initial data burst of described initial data is M, m is the initial data burst number that described the first Intelligent mobile equipment has been downloaded, and T postpones for default total download, and T ' is for remaining download time;
Judge the actual download progress whether less than the expectation download progress, described actual download progress equals the ratio m/M of m and M, and described expectation reality download progress equals the ratio T ' of T ' and T/T;
If less than, from the content server of Cellular Networks, download the coded slices of a described initial data, otherwise no longer from the content server of Cellular Networks, download the coded slices of described initial data.
Further, above-mentioned data download method also can have following characteristics, and step c comprises:
When described the first Intelligent mobile equipment and described the second Intelligent mobile equipment are near field communication range, receive the coded slices of the described initial data of described the second Intelligent mobile equipment transmission, and sending the coded slices of the own described initial data that has to described the second Intelligent mobile equipment, the coded slices that described the first Intelligent mobile equipment receives equates with the coded slices quantity of transmission;
The coded slices the Line independent whether coded slices that described the second Intelligent mobile equipment that described the first Intelligent mobile equipment judgement receives sends has had with oneself, if continue to carry out the coded slices exchange with described the second Intelligent mobile equipment, otherwise stop carrying out the coded slices exchange with described the second Intelligent mobile equipment.
Further, above-mentioned data download method also can have following characteristics, and the data volume of described initial data burst is less than default burst amount threshold value.
Further, above-mentioned data download method also can have following characteristics, and in step c, described short-range communication is Bluetooth communication or WiFi communication.
For solving the problems of the technologies described above, the present invention proposes a kind of data downloading system, be used for from the Cellular Networks downloading data, comprising:
Burst and coding module, the initial data that is used for downloading is divided into a plurality of initial data bursts, each described initial data burst is carried out the stochastic linear coding, obtain a plurality of coded slices, deposit on the content server of Cellular Networks, each coded slices comprises the partial information of all initial data bursts;
Download module, be used for depositing on the first Intelligent mobile equipment that will download described initial data from the part coded slices of the described initial data of content server download of Cellular Networks;
acquisition module, be used for making described the first Intelligent mobile equipment by short-range communication, obtain the residue coded slices of described initial data from least one second Intelligent mobile equipment of coded slices with described initial data, described residue coded slices and described part coded slices form whole coded slices of described initial data, described the second Intelligent mobile equipment is downloaded part coded slices and the storage of described initial data in advance from the content server of Cellular Networks, and the part coded slices that described the second Intelligent mobile equipment is downloaded is different from the part coded slices that described the first Intelligent mobile equipment is downloaded,
Decoder module, the whole coded slices that are used for the described initial data that described the first Intelligent mobile equipment is obtained are carried out the stochastic linear decoding, recover described initial data.
Further, above-mentioned data downloading system also can have following characteristics, if total number of the initial data burst of described initial data is M, m is the initial data burst number that described the first Intelligent mobile equipment has been downloaded, T postpones for default total download, T ' is for remaining download time, and described download module comprises:
Whether the first judging unit, be used for judge the actual download progress less than the expectation download progress, and described actual download progress equals the ratio m/M of m and M, and described expectation reality download progress equals the ratio T ' of T ' and T/T;
Processing unit, while being used for the actual download progress that judgment result is that at described the first judging unit less than the expectation download progress, download the coded slices of a described initial data from the content server of Cellular Networks, otherwise no longer from the content server of Cellular Networks, download the coded slices of described initial data.
Further, above-mentioned data downloading system also can have following characteristics, and described acquisition module comprises:
Crosspoint, be used for when described the first Intelligent mobile equipment and described the second Intelligent mobile equipment are near field communication range, receive the coded slices of the described initial data of described the second Intelligent mobile equipment transmission, and sending the coded slices of the own described initial data that has to described the second Intelligent mobile equipment, the coded slices that described the first Intelligent mobile equipment receives equates with the coded slices quantity of transmission;
The second judging unit, be used for judging the coded slices Line independent whether coded slices that described the second Intelligent mobile equipment that described the first Intelligent mobile equipment receives sends has had with described the first Intelligent mobile equipment, if continue to carry out the coded slices exchange with described the second Intelligent mobile equipment, otherwise stop carrying out the coded slices exchange with described the second Intelligent mobile equipment.
Further, above-mentioned data downloading system also can have following characteristics, and the data volume of described initial data burst is less than default burst amount threshold value.
Further, above-mentioned data downloading system also can have following characteristics, and described short-range communication is Bluetooth communication or WiFi communication.
Data download method of the present invention and system, make Intelligent mobile equipment first by cellular network download section divided data, mutually share the data of download by the opportunistic network data distribution mechanisms based on the stochastic linear coding again, make finally each Intelligent mobile equipment have complete data, under the prerequisite that meets content download delay, reduce the Cellular Networks flow use amount of all Intelligent mobile equipments, thereby reduced the data traffic of Cellular Networks.
Description of drawings
Fig. 1 (a) is traditional cellular network data downloading mode schematic diagram;
Fig. 1 (b) is the collaboration data downloading mode schematic diagram based on opportunistic network;
Fig. 2 is the flow chart of data download method in the embodiment of the present invention;
Fig. 3 is the network diagram of application data download method of the present invention;
Fig. 4 is the structured flowchart of data downloading system in the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, principle of the present invention and feature are described, example only is used for explaining the present invention, not is used for limiting scope of the present invention.
Application scenarios of the present invention is that an all devices in the Intelligent mobile equipment set all needs from the Internet(internet) on content server download the larger content of same data volume, such as: download software upgrading and video clip etc.
Fig. 2 is the flow chart of data download method in the embodiment of the present invention.As shown in Figure 2, in the present embodiment, the flow process of data download method can comprise the steps:
Step S201, the initial data that the content server of Cellular Networks will be downloaded is divided into a plurality of initial data bursts, and each initial data burst is carried out the stochastic linear coding, obtains a plurality of coded slices, wherein, each coded slices comprises the partial information of all initial data bursts;
Intelligent mobile equipment is carried by personnel usually, and personnel's the duration of meeting is shorter larger with the data volume that is downloaded content, therefore on content server first with the original contents (initial data that namely will download, lower same) be divided into a plurality of little data fragmentations, can be so that can transmit at least a data burst in the overwhelming majority's the duration that meets.
In order to guarantee to transmit at least a data burst in the duration that meets, a burst amount threshold value can be set according to concrete applicable cases, when burst, make the data volume of initial data burst less than this default burst amount threshold value.
Download identical burst for fear of the different intelligent mobile device, the burst that Intelligent mobile equipment is downloaded by cellular network need to first be processed through stochastic linear coding (random linear coding).Suppose that original contents is divided into M burst [b
1, b
2..., b
M], coded slices can be obtained by following formula (1):
In formula (1), code coefficient β
i,1, β
i,2..., β
i,MBe random selection the from Gauss territory (Galois Field, GF), and operator is all to carry out computing in corresponding Gauss territory.After the stochastic linear coding, each coded slices will comprise the partial information of all initial data bursts.The coded slices of M Line independent can recover an original M burst arbitrarily.
Step S202, download the first Intelligent mobile equipment of initial data and download the part coded slices of initial data from the content server of Cellular Networks;
Wherein, the first Intelligent mobile equipment and the second Intelligent mobile equipment that below will mention can be mobile phone.Intelligent mobile equipment has remote cellular network communication interface and short-range WiFi and Bluetooth communication interface, therefore they namely can be communicated by letter with all devices on Internet by cellular network, also can be by WiFi and Bluetooth(bluetooth) communicate by letter with near Intelligent mobile equipment.
Step S203, the first Intelligent mobile equipment is by short-range communication, at least one second Intelligent mobile equipment of stating the coded slices of initial data from tool obtains the residue coded slices of initial data, the part coded slices that this residue coded slices and step S202 download forms whole coded slices of initial data, the second Intelligent mobile equipment is downloaded part coded slices and the storage of initial data in advance from the content server of Cellular Networks, and the part coded slices that the second Intelligent mobile equipment is downloaded is different from the part coded slices that the first Intelligent mobile equipment is downloaded;
Wherein, short-range communication can be Bluetooth communication or WiFi communication.
here need to prove, the first Intelligent mobile equipment, the second Intelligent mobile equipment is all to download from the content server of Cellular Networks the Intelligent mobile equipment of initial data, they all download the part coded slices of initial data in advance from the content server of Cellular Networks, but the part coded slices possibility that each Intelligent mobile equipment is downloaded initial data from the content server of Cellular Networks is identical, also may be different, only have from the Intelligent mobile equipment of having downloaded different part coded slices and could obtain by the mode of exchange coded slices whole coded slices of initial data.Here, the purpose of distinguishing the first Intelligent mobile equipment, the second Intelligent mobile equipment only is to illustrate that both are not same Intelligent mobile equipments, and the part coded slices that both download is different.
Step S204, the first Intelligent mobile equipment carries out the stochastic linear decoding to whole coded slices of the initial data of acquisition, recovers initial data.
In embodiments of the present invention, step S202 can comprise following substep,, this concrete download policy is called the self adaptation download policy herein:
If total number of the initial data burst of initial data is M, m is the initial data burst number that the first Intelligent mobile equipment has been downloaded, and T postpones for default total download, and T ' is for remaining download time;
Judge the actual download progress whether less than the expectation download progress, described actual download progress equals the ratio m/M of m and M, and described expectation reality download progress equals the ratio T ' of T ' and T/T;
If less than, from the content server of Cellular Networks, download the coded slices of an initial data, otherwise no longer from the content server of Cellular Networks, download the coded slices of initial data.
In embodiments of the present invention, step S203 can comprise following substep:
When the first Intelligent mobile equipment and the second Intelligent mobile equipment are near field communication range, receive the coded slices of the described initial data of the second Intelligent mobile equipment transmission, and sending the coded slices of the own described initial data that has to the second Intelligent mobile equipment, the coded slices that the first Intelligent mobile equipment receives equates with the coded slices quantity of transmission;
The coded slices the Line independent whether coded slices that the second Intelligent mobile equipment that the first Intelligent mobile equipment judgement receives sends has had with oneself, if continue to carry out the coded slices exchange with described the second Intelligent mobile equipment, otherwise stop carrying out the coded slices exchange with the second Intelligent mobile equipment.
This specific embodiment adopts the thought based on " barter " of the opportunistic network data distribution mechanisms of stochastic linear coding to solve fairness problem and encourage Intelligent mobile equipment to download the part burst by cellular network.When two Intelligent mobile equipments met, they exchanged the burst of a recodification mutually by WiFi or Bluetooth.Suppose that the existing coded slices of certain equipment (comprising the recodification burst) is [c
1, c
2..., c
k], the recodification burst is obtained by following formula (2)
In formula (2), code coefficient β
1, β
2..., β
kThe random selection from the Gauss territory, and operator is all to carry out computing in corresponding Gauss territory.The burst of recoding and coded slices do not have the difference of essence, do not distinguish in transmitting procedure.Intelligent mobile equipment can adopt Gaussian elimination method to carry out the linear independent inspection after receiving the coded slices that neighbor device sends, if the new coded slices that receives is with the non-linear independence of coded slices of oneself having stored stop carrying out coded slices with these neighbours and exchange; If Line independent, continue the coded slices exchange.
Below by a concrete application example, the present invention is described in further detail.
Fig. 3 is the network diagram of application data download method of the present invention.In the present embodiment, content server adopts general Internet server, and Intelligent mobile equipment adopts installs the above operating system of Android 2.0, and has the smart mobile phone of Bluetooth communication function.More than mobile phone EMS memory 218MB, more than external memory 4GB.When new content produced, content server was divided into original contents on the one hand size and is the burst of 500KB, and utilizes the stochastic linear encryption algorithm these original slice to be encoded into the coded slices of some; Content server sends a message and has subscribed to the Intelligent mobile equipment of this content to all on the other hand, and the notice Intelligent mobile equipment starts to download this content.
After receiving the download notice, Intelligent mobile equipment is constantly downloaded coded slices by cellular network according to self adaptation download policy above-mentioned on the one hand; On the other hand,, every the neighbor device of 2 minutes run-down Bluetooth,, if discovering neighbor equipment has also been subscribed to this content,, according to above-mentioned opportunistic network data distribution mechanisms based on the stochastic linear coding, carry out " barter " of coded slices.Above two processes are continued until that this mobile device has enough coded slices, namely is enough to recover the coded slices of complete original contents.
Data download method of the present invention, Intelligent mobile equipment is first by cellular network download section divided data, mutually share the data of download by the opportunistic network data distribution mechanisms based on the stochastic linear coding again, make finally each Intelligent mobile equipment have complete data, under the prerequisite that meets content download delay, reduce the Cellular Networks flow use amount of all Intelligent mobile equipments, thereby reduced the data traffic of Cellular Networks.
The invention allows for a kind of data downloading system, in order to carry out above-mentioned data download method.
Fig. 4 is the structured flowchart of data downloading system in the embodiment of the present invention.As shown in Figure 4, in the present embodiment, data downloading system can comprise burst and coding module 410, download module 420, acquisition module 430 and decoder module 440.Burst and coding module 410, download module 420, acquisition module 430 and decoder module 440 are connected in turn.Wherein, the initial data that burst and coding module 410 are used for downloading is divided into a plurality of initial data bursts, each initial data burst is carried out the stochastic linear coding, obtain a plurality of coded slices, deposit on the content server of Cellular Networks, wherein, each coded slices comprises the partial information of all initial data bursts.Download module 420 is used for downloading from the content server of Cellular Networks the part coded slices of initial data, deposits on the first Intelligent mobile equipment that will download initial data.acquisition module 430 is used for making the first Intelligent mobile equipment by short-range communication (this short-range communication can be Bluetooth communication or WiFi communication), obtain the residue coded slices of initial data from least one second Intelligent mobile equipment of coded slices with initial data, the part coded slices that this residue coded slices and download module 420 are downloaded forms whole coded slices of initial data, the second Intelligent mobile equipment is downloaded part coded slices and the storage of initial data in advance from the content server of Cellular Networks, and the part coded slices that the second Intelligent mobile equipment is downloaded is different from the part coded slices that the first Intelligent mobile equipment is downloaded.Decoder module 440 is used for whole coded slices of the initial data that the first Intelligent mobile equipment is obtained and carries out the stochastic linear decoding, recovers initial data.
In embodiments of the present invention, download module 420 may further include the first judging unit and processing unit.The first judging unit is used for judging that whether the actual download progress is less than the expectation download progress, wherein, the actual download progress equals the ratio m/M of m and M, expect that real download progress equals the ratio T ' of T ' and T/T, M is total number of the initial data burst of initial data, m is the initial data burst number that the first Intelligent mobile equipment has been downloaded, and T postpones for default total download, and T ' is for remaining download time.When processing unit is used for the actual download progress that judgment result is that at the first judging unit less than the expectation download progress, download the coded slices of an initial data from the content server of Cellular Networks, otherwise no longer from the content server of Cellular Networks, download the coded slices of initial data.
In embodiments of the present invention, acquisition module 430 may further include crosspoint and the second judging unit.Wherein, crosspoint is used for when the first Intelligent mobile equipment and described the second Intelligent mobile equipment are near field communication range, receive the coded slices of the described initial data of the second Intelligent mobile equipment transmission, and sending the coded slices of the own described initial data that has to the second Intelligent mobile equipment, the coded slices that the first Intelligent mobile equipment receives equates with the coded slices quantity of transmission.The coded slices the Line independent whether coded slices that the second judging unit is used for the second Intelligent mobile equipment transmission judge that the first Intelligent mobile equipment receives has had with the first Intelligent mobile equipment, if continue to carry out the coded slices exchange with the second Intelligent mobile equipment, otherwise stop carrying out the coded slices exchange with the second Intelligent mobile equipment.
In embodiments of the present invention, burst amount threshold value can be set, the data volume of initial data burst is less than default burst amount threshold value.
Data downloading system of the present invention, carry out above-mentioned data download method with crossing, make Intelligent mobile equipment first by cellular network download section divided data, mutually share the data of download by the opportunistic network data distribution mechanisms based on the stochastic linear coding again, make finally each Intelligent mobile equipment have complete data, under the prerequisite that meets content download delay, reduced the Cellular Networks flow use amount of all Intelligent mobile equipments, thereby reduced the data traffic of Cellular Networks.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a data download method, be used for from the Cellular Networks downloading data, it is characterized in that, comprising:
Step a, the initial data that the content server of Cellular Networks will be downloaded is divided into a plurality of initial data bursts, each described initial data burst is carried out the stochastic linear coding, obtain a plurality of coded slices, each coded slices comprises the partial information of all initial data bursts;
Step b, download the first Intelligent mobile equipment of described initial data and download the part coded slices of described initial data from the content server of Cellular Networks;
step c, described the first Intelligent mobile equipment is by short-range communication, obtain the residue coded slices of described initial data from least one second Intelligent mobile equipment of coded slices with described initial data, described residue coded slices and described part coded slices form whole coded slices of described initial data, described the second Intelligent mobile equipment is downloaded part coded slices and the storage of described initial data in advance from the content server of Cellular Networks, and the part coded slices that described the second Intelligent mobile equipment is downloaded is different from the part coded slices that described the first Intelligent mobile equipment is downloaded,
Steps d, described the first Intelligent mobile equipment carries out the stochastic linear decoding to whole coded slices of the described initial data of acquisition, recovers described initial data.
2. data download method according to claim 1, is characterized in that, step b comprises:
If total number of the initial data burst of described initial data is M, m is the initial data burst number that described the first Intelligent mobile equipment has been downloaded, and T postpones for default total download, and T ' is for remaining download time;
Judge the actual download progress whether less than the expectation download progress, described actual download progress equals the ratio m/M of m and M, and described expectation reality download progress equals the ratio T ' of T ' and T/T;
If less than, from the content server of Cellular Networks, download the coded slices of a described initial data, otherwise no longer from the content server of Cellular Networks, download the coded slices of described initial data.
3. data download method according to claim 1, is characterized in that, step c comprises:
When described the first Intelligent mobile equipment and described the second Intelligent mobile equipment are near field communication range, receive the coded slices of the described initial data of described the second Intelligent mobile equipment transmission, and sending the coded slices of the own described initial data that has to described the second Intelligent mobile equipment, the coded slices that described the first Intelligent mobile equipment receives equates with the coded slices quantity of transmission;
The coded slices the Line independent whether coded slices that described the second Intelligent mobile equipment that described the first Intelligent mobile equipment judgement receives sends has had with oneself, if continue to carry out the coded slices exchange with described the second Intelligent mobile equipment, otherwise stop carrying out the coded slices exchange with described the second Intelligent mobile equipment.
4. data download method according to claim 1, is characterized in that, the data volume of described initial data burst is less than default burst amount threshold value.
5. data download method according to claim 1, is characterized in that, in step c, described short-range communication is Bluetooth communication or WiFi communication.
6. a data downloading system, be used for from the Cellular Networks downloading data, it is characterized in that, comprising:
Burst and coding module, the initial data that is used for downloading is divided into a plurality of initial data bursts, each described initial data burst is carried out the stochastic linear coding, obtain a plurality of coded slices, deposit on the content server of Cellular Networks, each coded slices comprises the partial information of all initial data bursts;
Download module, be used for depositing on the first Intelligent mobile equipment that will download described initial data from the part coded slices of the described initial data of content server download of Cellular Networks;
acquisition module, be used for making described the first Intelligent mobile equipment by short-range communication, obtain the residue coded slices of described initial data from least one second Intelligent mobile equipment of coded slices with described initial data, described residue coded slices and described part coded slices form whole coded slices of described initial data, described the second Intelligent mobile equipment is downloaded part coded slices and the storage of described initial data in advance from the content server of Cellular Networks, and the part coded slices that described the second Intelligent mobile equipment is downloaded is different from the part coded slices that described the first Intelligent mobile equipment is downloaded,
Decoder module, the whole coded slices that are used for the described initial data that described the first Intelligent mobile equipment is obtained are carried out the stochastic linear decoding, recover described initial data.
7. data downloading system according to claim 1, it is characterized in that, if total number of the initial data burst of described initial data is M, m is the initial data burst number that described the first Intelligent mobile equipment has been downloaded, T postpones for default total download, T ' is for remaining download time, and described download module comprises:
Whether the first judging unit, be used for judge the actual download progress less than the expectation download progress, and described actual download progress equals the ratio m/M of m and M, and described expectation reality download progress equals the ratio T ' of T ' and T/T;
Processing unit, while being used for the actual download progress that judgment result is that at described the first judging unit less than the expectation download progress, download the coded slices of a described initial data from the content server of Cellular Networks, otherwise no longer from the content server of Cellular Networks, download the coded slices of described initial data.
8. data downloading system according to claim 1, is characterized in that, described acquisition module comprises:
Crosspoint, be used for when described the first Intelligent mobile equipment and described the second Intelligent mobile equipment are near field communication range, receive the coded slices of the described initial data of described the second Intelligent mobile equipment transmission, and sending the coded slices of the own described initial data that has to described the second Intelligent mobile equipment, the coded slices that described the first Intelligent mobile equipment receives equates with the coded slices quantity of transmission;
The second judging unit, be used for judging the coded slices Line independent whether coded slices that described the second Intelligent mobile equipment that described the first Intelligent mobile equipment receives sends has had with described the first Intelligent mobile equipment, if continue to carry out the coded slices exchange with described the second Intelligent mobile equipment, otherwise stop carrying out the coded slices exchange with described the second Intelligent mobile equipment.
9. data downloading system according to claim 1, is characterized in that, the data volume of described initial data burst is less than default burst amount threshold value.
10. data downloading system according to claim 1, is characterized in that, described short-range communication is Bluetooth communication or WiFi communication.
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| CN104580371A (en) * | 2014-12-10 | 2015-04-29 | 北京邮电大学 | Methods of fragmentation, transmission and copy control for file fixed size and changeable size in opportunistic network |
| CN105657646A (en) * | 2016-01-29 | 2016-06-08 | 南京悦控智能科技有限公司 | Bluetooth 4.0 based device-to-device big data communication method |
| CN109413190A (en) * | 2018-11-05 | 2019-03-01 | 腾讯科技（深圳）有限公司 | File acquisition method, device, electronic equipment and storage medium |
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| CN101420457A (en) * | 2008-12-03 | 2009-04-29 | 腾讯科技（深圳）有限公司 | Method, apparatus for downloading data fragmentation by peer, and peer therefor |
| CN102143232A (en) * | 2011-04-02 | 2011-08-03 | 南京邮电大学 | Peer-to-peer network based digital copyright protection method |
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| US7203843B2 (en) * | 2002-05-02 | 2007-04-10 | Fuji Xerox Co., Ltd. | Method and system for transferring data |
| CN101420457A (en) * | 2008-12-03 | 2009-04-29 | 腾讯科技（深圳）有限公司 | Method, apparatus for downloading data fragmentation by peer, and peer therefor |
| CN102143232A (en) * | 2011-04-02 | 2011-08-03 | 南京邮电大学 | Peer-to-peer network based digital copyright protection method |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104580371A (en) * | 2014-12-10 | 2015-04-29 | 北京邮电大学 | Methods of fragmentation, transmission and copy control for file fixed size and changeable size in opportunistic network |
| CN104580371B (en) * | 2014-12-10 | 2018-06-15 | 北京邮电大学 | File is fixed and variable-size fragment, transmission, copy control methods in opportunistic network |
| CN104581818A (en) * | 2014-12-30 | 2015-04-29 | 中国科学院深圳先进技术研究院 | Traffic exchange method and system based on mobile terminal |
| CN105657646A (en) * | 2016-01-29 | 2016-06-08 | 南京悦控智能科技有限公司 | Bluetooth 4.0 based device-to-device big data communication method |
| CN109413190A (en) * | 2018-11-05 | 2019-03-01 | 腾讯科技（深圳）有限公司 | File acquisition method, device, electronic equipment and storage medium |
| CN109413190B (en) * | 2018-11-05 | 2020-09-04 | 腾讯科技（深圳）有限公司 | File acquisition method and device, electronic equipment and storage medium |
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| CN103402229B (en) | 2016-04-13 |
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