WO2018000647A1 - Procédé, dispositif et terminal destinés au téléchargement de fichiers - Google Patents

Procédé, dispositif et terminal destinés au téléchargement de fichiers Download PDF

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Publication number
WO2018000647A1
WO2018000647A1 PCT/CN2016/101090 CN2016101090W WO2018000647A1 WO 2018000647 A1 WO2018000647 A1 WO 2018000647A1 CN 2016101090 W CN2016101090 W CN 2016101090W WO 2018000647 A1 WO2018000647 A1 WO 2018000647A1
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WO
WIPO (PCT)
Prior art keywords
file
data
terminal
fountain code
packets
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Application number
PCT/CN2016/101090
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English (en)
Chinese (zh)
Inventor
陈翔
胡勇
Original Assignee
乐视控股（北京）有限公司
乐视网信息技术（北京）股份有限公司
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Application filed by 乐视控股（北京）有限公司, 乐视网信息技术（北京）股份有限公司 filed Critical 乐视控股（北京）有限公司
Publication of WO2018000647A1 publication Critical patent/WO2018000647A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L65/00—Network arrangements, protocols or services for supporting real-time applications in data packet communication
    • H04L65/40—Support for services or applications
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/06—Protocols specially adapted for file transfer, e.g. file transfer protocol [FTP]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L67/00—Network arrangements or protocols for supporting network services or applications
    • H04L67/01—Protocols
    • H04L67/10—Protocols in which an application is distributed across nodes in the network
    • H04L67/104—Peer-to-peer [P2P] networks

Definitions

  • the present application relates to the field of computer technologies, and in particular, to a file downloading method, apparatus, terminal, and server.
  • P2P peer to peer, peer-to-peer
  • P2SP Peer to Server and Peer
  • the basic transmission mode of P2P or P2SP is to divide the file into blocks first, and then transfer them by block until the file is transmitted.
  • the "S" of P2SP refers to the server. P2SP effectively integrates the original isolated server with its mirrored resources and P2P resources.
  • the inventor finds that when data is transmitted between terminals or between a terminal and a server, if the network environment is bad, the data synchronization transmission may be failed, or repeated retransmission may be required to finally successfully complete the data transmission. . Therefore, in the case of a poor network environment, the reliability of data transmission in a P2P or P2SP network is poor.
  • the embodiment of the present invention provides a file downloading method, device, terminal, and server, which are used to solve the problem of low reliability of data transmission in a poor network environment in the prior art.
  • the embodiment of the present application provides a file downloading method, which is applicable to a terminal, and includes:
  • the data in the local file is encoded to generate the first fountain code data, including:
  • N is an integer greater than zero
  • the N coded packets constitute the first fountain code data
  • the foregoing method further includes:
  • the feedback information is sent by the terminal after receiving a preset number of the encoded packets, and the preset quantity is greater than the K.
  • the foregoing method further includes:
  • the M' is the number of original data packets obtained by grouping data in the process of generating the second fountain code data, and the M' is an integer greater than or equal to 2.
  • the foregoing method further includes:
  • S >S′, where S′ is the number of original data packets obtained by grouping the file data of the file to be downloaded in the process of generating fountain code data of the file data, where S′ is greater than Or an integer equal to 2.
  • the foregoing method further includes:
  • the foregoing method further includes:
  • the file data corresponding to the file identifier to be queried is stored locally, the file data of the file to be queried is encoded to generate corresponding fountain code data;
  • the sending by the terminal requesting to download the data in the terminal list, the first fountain code data, specifically:
  • the first fountain code data is sent to the terminal requesting to download the data in the terminal list by using a user datagram protocol UDP.
  • the embodiment of the present application further provides a file downloading method, which is applicable to a server, and includes:
  • the data in the file is encoded to generate fountain code data, wherein the fountain code
  • the data contains N coded packets, and N is an integer greater than zero;
  • the data in the file is encoded to generate fountain code data, including:
  • K is an integer greater than or equal to 2
  • N is an integer greater than zero
  • the foregoing method further includes:
  • the feedback information is sent by the terminal after receiving a preset number of the encoded packets, and the preset quantity is greater than the K.
  • the foregoing method further includes:
  • the query request is sent to other terminals in the network, where the query request carries The file identifier of the document;
  • the K is the number of original data packets obtained by grouping data in the process of generating the fountain code data, and the K is an integer greater than or equal to 2.
  • the sending, by the terminal, the N coded packets specifically:
  • the N coded packets are sent to the terminal using a User Datagram Protocol (UDP).
  • UDP User Datagram Protocol
  • the application also provides a file downloading device, which is applicable to a terminal, and includes:
  • An obtaining module configured to obtain a terminal list for downloading the same file
  • An encoding module configured to encode data stored in the local file to generate a first Fountain code data, wherein the first fountain code data includes N coded packets, and N is an integer greater than zero;
  • a sending module configured to send the N coded packets to a terminal in the terminal list that requests to download the data.
  • the encoding module includes:
  • a grouping unit configured to group data stored in the local file to obtain K original data packets
  • a coding unit configured to perform fountain code encoding on the K original data packets to generate N coded packets
  • K is an integer greater than or equal to 2
  • N is an integer greater than zero
  • the file downloading device mentioned above further includes:
  • the sending module is further configured to stop sending the N coded packets to the terminal after receiving the feedback information sent by the terminal;
  • the feedback information is sent by the terminal after receiving a preset number of the encoded packets, and the preset quantity is greater than the K.
  • the file downloading device mentioned above further includes:
  • a first receiving module configured to receive second fountain code data sent by the terminal
  • a first decoding module configured to decode data corresponding to the second fountain code data based on the received M coded packets included in the second fountain code data
  • the M' is the number of original data packets obtained by grouping data in the process of generating the second fountain code data, and the M' is an integer greater than or equal to 2.
  • the file downloading device mentioned above further includes:
  • the sending module is further configured to: when the data sent by the terminal in the terminal list is not received, send a download request to the server, where the download request carries a file identifier to be downloaded;
  • a second receiving module configured to receive the fountain code data of the file data corresponding to the file identifier to be downloaded sent by the server
  • a second decoding module configured to decode the file data of the file to be downloaded based on the S coded packets included in the fountain code data of the received file data
  • S >S′, where S′ is the number of original data packets obtained by grouping the file data of the file to be downloaded in the process of generating fountain code data of the file data, where S′ is greater than Or an integer equal to 2.
  • the second receiving module is further configured to receive scheduling information sent by the server, and send the file to the terminal specified by the scheduling information according to the scheduling information.
  • Fountain code data for data is further configured to receive scheduling information sent by the server, and send the file to the terminal specified by the scheduling information according to the scheduling information.
  • the file downloading device mentioned above further includes:
  • a third receiving module configured to receive a query request sent by the server, where the query request carries a file identifier to be queried;
  • the encoding module is further configured to: when the file data corresponding to the file identifier to be queried is locally stored, encode the file data of the file to be queried to generate corresponding fountain code data;
  • the sending module is further configured to send, to the server end, the fountain code data corresponding to the file to be queried.
  • the sending module is specifically configured to send, by using a user datagram protocol UDP, the first fountain code data to a terminal requesting to download the data in the terminal list.
  • the embodiment of the present application further provides a file downloading apparatus, which is applicable to a server, and includes:
  • a receiving module configured to receive a download request sent by the terminal, where the download request carries an identifier of the file
  • An encoding module configured to: when a terminal that stores a file corresponding to the file identifier does not exist in the network, and locally store the file corresponding to the file identifier, encode data in the file to generate fountain code data, where
  • the fountain code data includes N coded packets, and N is an integer greater than zero;
  • a sending module configured to send the N coded packets to the terminal.
  • the encoding module includes:
  • a grouping unit configured to group data in the file to obtain K original data packets
  • a coding unit configured to perform fountain code encoding on the K original data packets to generate N coded packets
  • K is an integer greater than or equal to 2
  • N is an integer greater than zero
  • the sending module is further configured to: after receiving the feedback information sent by the terminal, stop sending the N encoded packets to the terminal;
  • the feedback information is sent by the terminal after receiving a preset number of the encoded packets, and the preset quantity is greater than the K.
  • the file downloading device mentioned above further includes:
  • the sending module is further configured to send a query request to another terminal in the network when the terminal that stores the file corresponding to the file identifier does not exist in the network, and the file corresponding to the file identifier is not stored locally, where
  • the query request carries a file identifier of the file
  • the receiving module is further configured to: when the terminal that stores the file exists in the network, receive the fountain code data sent by the terminal;
  • a decoding module configured to decode data of the file based on the received L coded packets included in the fountain code data
  • the K is the number of original data packets obtained by grouping data in the process of generating the fountain code data, and the K is an integer greater than or equal to 2.
  • the sending module is specifically configured to send the N encoded packets to the terminal by using a User Datagram Protocol (UDP).
  • UDP User Datagram Protocol
  • the embodiment of the present application further provides a file downloading system, which is characterized in that it comprises a file downloading device suitable for a terminal and a file downloading device suitable for the server side;
  • the file downloading device suitable for the terminal is used for:
  • the file downloading device suitable for the server side is used for:
  • the data in the file is encoded to generate fountain code data, wherein the fountain code
  • the data contains N coded packets, and N is an integer greater than zero;
  • An embodiment of the present application provides a file download terminal, including at least one processor, and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor, The instructions are set as a file downloading method for performing the above-described one of the applications of the present application.
  • the embodiment of the present application further provides a non-transitory computer storage medium storing computer executable instructions for executing the file downloading method applicable to the terminal according to any of the above applications of the present application.
  • the embodiment of the present application provides a computer program product, comprising: a computer readable storage medium and computer program instructions embedded therein, when the program instructions are executed by a computer, causing the computer to execute the application Any of the above applies to the file downloading method of the terminal.
  • An embodiment of the present application provides a server, including at least one processor, and a memory communicatively coupled to the at least one processor, wherein the memory stores instructions executable by the at least one processor, The instructions are set to execute a file downloading method applicable to the server side of any of the above applications of the present application.
  • the embodiment of the present application further provides a non-transitory computer storage medium, which stores computer executable instructions, and the computer executable instructions are used to execute the file downloading method applicable to the server side according to any of the above applications.
  • the embodiment of the present application provides a computer program product, comprising: a computer readable storage medium and computer program instructions embedded therein, when the program instructions are executed by a computer, causing the computer to execute the application Any of the above applies to the server-side file download method.
  • the file downloading method, device, terminal and server provided by the embodiment of the present application encode the block data of the target file to be transmitted into the fountain code data, and continuously send the terminal to the terminal requesting the download based on the characteristics of the fountain code data. Until the receiving terminal sends the feedback information to stop, even if the network environment is poor, the partial coded packet is lost. Because the fountain code is continuously sent by the source, the receiving terminal can continue to receive and can receive the preset number of codes. The packet decodes the corresponding block data.
  • the technical solution provided by the embodiment of the present application improves the reliability of data transmission; in addition, since the receiving terminal only sends feedback information after receiving a preset number of coded packets, compared with In the prior art, as long as one transmission failure occurs, a retransmission request is fed back.
  • the embodiment of the present application reduces the transmission of feedback information in the channel by using the fountain code, which helps to improve the channel capacity and makes the network more robust.
  • FIG. 1 is a schematic structural diagram of an optional P2SP network according to an embodiment of the present disclosure
  • FIG. 2 is a schematic flowchart of a file downloading method according to Embodiment 1 of the present application;
  • FIG. 3 is a schematic flowchart of a file downloading method according to Embodiment 2 of the present application.
  • FIG. 4 is a schematic flowchart of a file downloading method according to Embodiment 3 of the present application.
  • FIG. 5 is a schematic flowchart of a file downloading method according to Embodiment 4 of the present application.
  • FIG. 6 is a schematic structural diagram of a file downloading apparatus according to Embodiment 6 of the present application.
  • FIG. 7 is a schematic structural diagram of a file downloading apparatus according to Embodiment 7 of the present application.
  • FIG. 8 is a schematic structural diagram of a file download terminal according to Embodiment 10 of the present application.
  • FIG. 9 is a schematic structural diagram of a file download server according to Embodiment 12 of the present application.
  • FIG. 1 An application scenario in which the file downloading method provided by the embodiment of the present application can be applied is first introduced in conjunction with FIG. 1 .
  • the file downloading method provided by the embodiment of the present application is applicable to P2P and P2SP networks.
  • P2SP adds a data source provider S (Server) based on the P2P architecture.
  • S data source provider
  • This data source distributes multimedia data to certain nodes in the network.
  • Other nodes can peer to peer network from other ways.
  • the node that has the data gets the multimedia data.
  • FIG. 1 is a schematic structural diagram of an optional P2SP network according to an embodiment of the present application.
  • the network architecture includes a server device 602 and a plurality of terminal devices 601. It is assumed that the network architecture includes three terminal devices A, B, and C, and the three terminal devices need to download the same file.
  • the server device stores a list of terminals that download the same file, and the list includes identifiers of the terminal device A, the terminal device B, and the terminal device C.
  • the server device After receiving the download request sent by the terminal device, the server device adds the identifier of the terminal device that sends the download request to the terminal list with the identifier of the file as the key key; or the server device
  • the identifier of the file carried in the download request the attribute of the file is obtained, the file fingerprint of the file is calculated, and the identifier of the terminal device that sends the download request is added to the terminal list with the fingerprint of the file as the keyword key.
  • the attributes of the file include but are not limited to: URL (Uniform Resource Locator, Uniform Resource Locator, BT (BitTorrent, BitTorrent) seed file, ed2k (eDonkey2000network, eDonkey 2000 network) link, etc.
  • the terminal device A stores the block data 1 of the target file
  • the terminal device B stores the block data 2 of the target file
  • the terminal device C stores the block data 3 of the target file.
  • the terminal device A can encode the block data 1 to generate the fountain code data; and then continuously distribute the plurality of codes in the fountain code data of the block data 1 to the terminal device B and the terminal device C requesting to download the target file in the terminal list. Grouping.
  • the terminal device B may perform the fountain code encoding of the local block data 2 and then distribute it to the terminal device A and the terminal device C; the terminal device C may encode the local block data 3 into the fountain code and then to the terminal device A and the terminal. Device B is distributed.
  • the terminal device may send a download request to the server device, and the server device at this time Equivalent to a terminal device in the network distributing the chunked data to the terminal device requesting to download the target file.
  • the server device may also send a query request to other terminal devices in the network. If the terminal device has this file in the network, then at this time, the server device acquires the file segmentation information and the block data from the terminal device storing the target file, and obtains the file segmentation information, like the normal terminal device.
  • the server device If the server device does not query the target file in the full P2SP network, the server device will obtain resources according to the information submitted by the terminal device submitting the request to other networks, such as BT, ed2k, and the like. If the server device still does not query the result in other networks, it will not be able to obtain the resource to the requesting terminal device, and the terminal device downloads the file according to the attribute of the target file.
  • networks such as BT, ed2k, and the like.
  • FIG. 2 is a schematic flowchart diagram of a file downloading method provided in Embodiment 1 of the present application.
  • the method provided by this embodiment is applicable to a terminal.
  • the execution body of the method provided in this embodiment may be a file downloading device, and the file downloading device may be a hardware entity or an application installed on the terminal device.
  • the method provided in the first embodiment includes:
  • Step 101 Obtain a terminal list for downloading the same file.
  • this step can be implemented by the following methods:
  • Step S11 Send a download request for downloading the file to the server.
  • Step S12 Receive a terminal list that is fed back by the server and uses the identifier of the file as a key.
  • the server-side device if the server-side device locally stores the file corresponding to the file identifier, the server-side device first obtains the attribute of the file according to the identifier of the file after receiving the download request. And calculating a fingerprint of the first object file according to the attribute.
  • the manner of generating a fingerprint can be implemented by referring to the existing manner, and is not described in this embodiment.
  • the attributes of the file include but are not limited to: URL, BT seed file, ed2k link, etc.
  • the server device queries that the terminal list with the fingerprint as the key is created locally, the identifier of the terminal is added to the terminal list; if the server device queries the local fingerprint, the fingerprint is For the terminal list of the key, a terminal list with the fingerprint as a key is created, and the identifier of the terminal is added to the terminal list. Finally, the terminal is fed back to the terminal with a list of terminals whose fingerprint is a key.
  • Step 102 Encode data stored in the local file to generate first fountain code data, where the first fountain code data includes N coded packets, and N is an integer greater than zero.
  • this step can be implemented as follows:
  • the data stored in the local file is grouped to obtain K original data packets.
  • the K original data packets are coded by fountain code to generate N coded packets.
  • K is an integer greater than or equal to 2
  • N is an integer greater than zero
  • the fountain code can be an LT code or a Raptor code.
  • the so-called fountain code means that any number of coded packets can be generated from k original data packets by using the code, and as long as any n (n ⁇ k) coded packets are known, all the originals can be successfully recovered by decoding. Data grouping.
  • the length of each input original data packet is L bits and the data unit of length L bits is divided into input original data packets.
  • Degree d indicates the number of original data packets selected each time in the fountain code encoding process.
  • Step 103 Send, by the terminal requesting to download the data in the terminal list, the N coded packets.
  • a UDP User Datagram Protocol
  • a UDP protocol may be used to send the N coded packets to a terminal requesting to download the data in the terminal list.
  • the UDP protocol can reduce the transmission amount of protocol data in the transmission process, and the data can be successfully and safely restored even if the data packet loss is encoded under the fountain code.
  • the transmitting end of the fountain code is randomly coded, and any number of encoded packets are generated by k original packets, and the transmitting end continuously transmits data without knowing whether the data packets are successfully received. package.
  • the receiving end receives any subset of k(1+ ⁇ ) coded packets, that is, it receives a slightly larger than the original k-worth N, it can be decoded with high probability (and ⁇ ). Related) Successfully restore all original groupings.
  • a single source node S such as a homologous source, continuously generates a fountain of water droplets (encoding packets), and continuously sends "water droplets" (representing data packets) to a plurality of buckets K (representing multiple receiving buffers), when water in a bucket When it is full (cache full), it sends a feedback to the source node.
  • Each time a water droplet is sent is a combination of some randomly selected packets in a frame. This combination can be linear or non-linear. Random selection ensures that the information sent each time is useful to the receiving node.
  • the bucket After filling the bucket (receiving a sufficient amount of water droplets), the bucket can be used for drinking (successful decoding) without having to care which drop of water (coded packet) flows into the bucket.
  • the source node After the source node receives the ACK of all the buckets, it sends a new frame, otherwise it continues to send the combined packet.
  • the technical solution provided by the embodiment of the present application encodes the block data of the target file to be transmitted into the fountain code data, and continuously sends the data to the terminal requesting the download based on the characteristics of the fountain code data until the terminal receives the feedback information. After stopping, even if the network packet environment is poor, part of the encoded packet is lost. Because the fountain code is continuously transmitted, the receiving terminal can continue to receive and can decode the corresponding block based on receiving the preset number of encoded packets. Data, it is obvious that the technical solution provided by the embodiment of the present application improves the reliability of data transmission; in addition, since the receiving terminal sends feedback information only after receiving a preset number of encoded packets, it is only once in the prior art. The transmission fails to feed back a retransmission request. The embodiment of the present application reduces the transmission of feedback information in the channel by using the fountain code, which helps to improve the channel capacity and make the network more robust.
  • FIG. 3 is a schematic flowchart diagram of a file downloading method provided in Embodiment 1 of the present application.
  • the method provided by this embodiment is applicable to a terminal.
  • the execution body of the method provided by this embodiment may be a file downloading device, and the file downloading device may be a hardware entity or an application program installed on the terminal terminal device.
  • the method provided in the second embodiment includes:
  • Step 201 Obtain a terminal list for downloading the same file.
  • Step 202 Encode data stored in the local file to generate a first fountain Code data, wherein the first fountain code data includes N coded packets, and N is an integer greater than zero.
  • Step 203 Send, by the terminal requesting to download the data in the terminal list, the N coded packets.
  • Step 204 After receiving the feedback information sent by the terminal, stop sending the N coded packets to the terminal.
  • the feedback information is sent by the terminal after receiving a preset number of the encoded packets, and the preset quantity is greater than the K.
  • the preset number may be equal to K(1+ ⁇ ), and ⁇ is a preset decoding overhead.
  • the decoding overhead can be artificially set. Of course, the larger the decoding overhead, the greater the probability of recovering all the original packets based on the received encoded packets. In the specific implementation, the technician can find a suitable decoding cost value according to multiple experiments.
  • Step 205 Receive second fountain code data sent by the terminal.
  • Step 206 Decode data corresponding to the second fountain code data based on the received M coded packets included in the second fountain code data.
  • M is the number of original data packets obtained by grouping data in the process of generating the second fountain code data
  • M' is an integer greater than or equal to 2.
  • M may be equal to M'(1+ ⁇ )
  • ⁇ is a preset decoding overhead.
  • the decoding overhead can be artificially set. Of course, the larger the decoding overhead, the greater the probability of recovering all the original packets based on the received encoded packets.
  • the technician can find a suitable decoding cost value according to multiple experiments.
  • Step 207 If the data sent by the terminal in the terminal list cannot be received, send a download request to the server, where the download request carries the file identifier to be downloaded.
  • the terminal may not receive the data sent by the terminal in the terminal list, and the following may be the case:
  • the terminal successfully establishes a connection with at least one of all the terminals in the terminal list, but cannot receive the data sent by the terminal that successfully establishes the connection.
  • Step 208 Receive fountain code data of the file data corresponding to the file identifier to be downloaded sent by the server.
  • Step 209 Decode the file data of the file to be downloaded based on the S coded packets included in the fountain code data of the received file data.
  • S >S′, where S′ is the number of original data packets obtained by grouping the file data of the file to be downloaded in the process of generating fountain code data of the file data, where S′ is greater than Or an integer equal to 2.
  • S may be equal to S'(1+ ⁇ ), and ⁇ is a preset decoding overhead.
  • the decoding overhead can be artificially set. Of course, the larger the decoding overhead, the greater the probability of recovering all the original packets based on the received encoded packets. In the specific implementation, the technician can find a suitable decoding cost value according to multiple experiments.
  • Step 210 Receive scheduling information sent by the server, and send the fountain code data of the file data to the terminal specified by the scheduling information according to the scheduling information.
  • Step 211 Receive a query request sent by the server, where the query request carries a file identifier to be queried.
  • Step 212 If the file data corresponding to the file identifier to be queried is stored locally, the file data of the file to be queried is encoded to generate corresponding fountain code data.
  • Step 213 Send the fountain code data corresponding to the file to be queried to the server.
  • the technical solution provided by the embodiment of the present application encodes the block data of the target file to be transmitted into the fountain code data, and continuously sends the data to the terminal requesting the download based on the characteristics of the fountain code data until the terminal receives the feedback information. After stopping, even if the network packet environment is poor, part of the encoded packet is lost. Because the fountain code is continuously transmitted, the receiving terminal can continue to receive and can decode the corresponding block based on receiving the preset number of encoded packets. Data, it is obvious that the technical solution provided by the embodiment of the present application improves the reliability of data transmission; in addition, since the receiving terminal sends feedback information only after receiving a preset number of encoded packets, it is only once in the prior art. If the transmission fails, a retransmission request is fed back. The embodiment of the present application is reduced by the use of the fountain code. The transmission of feedback information in the channel helps to increase the channel capacity and make the network more robust.
  • FIG. 4 is a schematic flowchart diagram of a file downloading method provided in Embodiment 3 of the present application.
  • the method provided in this embodiment is applicable to a server.
  • the execution body of the method provided in this embodiment may be a file downloading device, and the file downloading device may be a hardware entity or an application installed on a server device.
  • the method provided in the third embodiment includes:
  • Step 301 Receive a download request sent by the terminal, where the download request carries an identifier of the file.
  • the download request may be sent by the terminal when it is unable to download the file corresponding to the identifier from another terminal in the network, such as a terminal in the terminal list that downloads the file, and of course It can be sent directly by the terminal.
  • the terminal may not receive the data sent by the terminal in the terminal list, and the following may be the case:
  • the terminal successfully establishes a connection with at least one of all the terminals in the terminal list, but cannot receive the data sent by the terminal that successfully establishes the connection.
  • Step 302 If there is no terminal in the network that stores the file corresponding to the file identifier, and locally stores the file corresponding to the file identifier, the data in the file is encoded to generate fountain code data, where The fountain code data includes N coded packets, and N is an integer greater than zero.
  • this step can be implemented by the following methods:
  • the data in the file is grouped to obtain K original data packets.
  • the K original data packets are coded by fountain code to generate N coded packets.
  • K is an integer greater than or equal to 2
  • N is an integer greater than zero
  • Step 303 Send the N coded packets to the terminal.
  • the technical solution provided by the embodiment of the present application encodes the block data of the target file to be transmitted into the fountain code data, and continuously sends the data to the terminal requesting the download based on the characteristics of the fountain code data until the terminal receives the feedback information. After stopping, even if the network packet environment is poor, part of the encoded packet is lost. Because the fountain code is continuously transmitted, the receiving terminal can continue to receive and can decode the corresponding block based on receiving the preset number of encoded packets. Data, it is obvious that the technical solution provided by the embodiment of the present application improves the reliability of data transmission; in addition, since the receiving terminal sends feedback information only after receiving a preset number of encoded packets, it is only once in the prior art. The transmission fails to feed back a retransmission request. The embodiment of the present application reduces the transmission of feedback information in the channel by using the fountain code, which helps to improve the channel capacity and make the network more robust.
  • FIG. 5 is a schematic flowchart diagram of a file downloading method provided in Embodiment 4 of the present application.
  • the method provided in this embodiment is applicable to a server.
  • the execution body of the method provided in this embodiment may be a file downloading device, and the file downloading device may be a hardware entity or an application installed on a server device.
  • the method provided in the fourth embodiment includes:
  • Step 401 Receive a download request sent by the terminal, where the download request carries an identifier of the file.
  • Step 402 If the terminal that stores the file corresponding to the file identifier does not exist in the network, and locally stores the file corresponding to the file identifier, the data in the file is encoded to generate fountain code data, where The fountain code data includes N coded packets, and N is an integer greater than zero.
  • Step 403 Send the N coded packets to the terminal.
  • the UDP protocol can be used to send the N coded packets to the terminal, and the UDP protocol can reduce the transmission amount of protocol data during the transmission process, even if there is data loss in the code guarantee of the fountain code. Can restore data smoothly and safely.
  • Step 404 After receiving the feedback information sent by the terminal, stop sending the N coded packets to the terminal.
  • the feedback information is sent by the terminal after receiving a preset number of the encoded packets, and the preset quantity is greater than the K.
  • the preset number may be equal to K(1+ ⁇ ), and ⁇ is a preset decoding overhead.
  • the decoding overhead can be artificially set. Of course, the larger the decoding overhead, the greater the probability of recovering all the original packets based on the received encoded packets. In the specific implementation, the technician can find a suitable decoding cost value according to multiple experiments.
  • Step 405 If the terminal that stores the file corresponding to the file identifier does not exist in the network, and the file corresponding to the file identifier is not stored locally, send a query request to other terminals in the network, where the query request is The file identifier carrying the file.
  • Step 406 If there is a terminal that stores the file in the network, receive the fountain code data sent by the terminal.
  • the network may include one of a P2SP network, a BT network, an ed2k network, or any other network.
  • Step 407 Decode data of the file based on the received L coded packets included in the fountain code data.
  • the K is the number of original data packets obtained by grouping data in the process of generating the fountain code data, and the K is an integer greater than or equal to 2.
  • the L may be equal to K(1+ ⁇ ), and ⁇ is a preset decoding overhead.
  • the decoding overhead can be artificially set. Of course, the larger the decoding overhead, the greater the probability of recovering all the original packets based on the received encoded packets. In the specific implementation, the technician can find a suitable decoding cost value according to multiple experiments.
  • Step 408 If there is no terminal that stores the file in the network, send a prompt message to the terminal that the file cannot be obtained.
  • the technical solution provided by the embodiment of the present application encodes the block data of the target file to be transmitted into the fountain code data, and continuously sends the data to the terminal requesting the download based on the characteristics of the fountain code data until the terminal receives the feedback information. After stopping, even if the network packet environment is poor, part of the encoded packet is lost. Because the fountain code is continuously transmitted, the receiving terminal can continue to receive and can decode the corresponding block based on receiving the preset number of encoded packets.
  • the technical solution provided by the embodiment of the present application improves the reliability of data transmission; in addition, since the receiving terminal only sends feedback information after receiving a preset number of encoded packets, as long as there is only one in the prior art In the case of a transmission failure, a retransmission request is fed back.
  • the embodiment of the present application reduces the transmission of feedback information in the channel by using the fountain code, which helps to improve the channel capacity and makes the network more robust.
  • FIG. 6 is a schematic structural diagram of a file downloading apparatus provided in Embodiment 5 of the present application.
  • the file downloading device may be a hardware entity or an application installed on the terminal device.
  • the terminal device may be any computer device, a notebook computer, a mobile phone, a tablet computer, a PDA (Personal Digital Assistant), a POS (Point of Sales), an in-vehicle computer, or the like.
  • the file downloading apparatus provided in the fifth embodiment includes: an obtaining module 501, an encoding module 502, and a sending module 503. among them,
  • the obtaining module 501 is configured to obtain a terminal list for downloading the same file.
  • the encoding module 502 is configured to encode the data stored in the local file to generate the first fountain code data, where the first fountain code data includes N coded packets, where N is an integer greater than zero;
  • the sending module 503 is configured to send, by the terminal requesting to download the data in the terminal list, the N coded packets.
  • the technical solution provided by the embodiment of the present application encodes the block data of the target file to be transmitted into the fountain code data, and continuously sends the data to the terminal requesting the download based on the characteristics of the fountain code data until the terminal receives the feedback information. After stopping, even if the network environment is poor, part of the encoded packet is lost. Because the fountain code is continuously sent, the receiving terminal can continue to connect. The receiving and decoding can decode the corresponding blocked data based on the received preset number of encoded packets. It is obvious that the technical solution provided by the embodiment of the present application improves the reliability of the data transmission; in addition, since the receiving terminal only receives the preset number of The feedback information is sent after the coding group is sent. Compared with the prior art, only one transmission failure is required to feed back a retransmission request. The embodiment of the present application reduces the transmission of feedback information in the channel by using the fountain code, which helps to improve. Channel capacity makes the network more robust.
  • file downloading device may implement the file downloading method provided in the first embodiment or the second embodiment.
  • file downloading method provided in the first embodiment or the second embodiment.
  • the sixth embodiment of the present application further describes the technical solution provided by the present application based on the file downloading apparatus provided in the foregoing fifth embodiment.
  • the file downloading device may be a hardware entity or an application installed on the terminal device.
  • the terminal device may be any computer device, a notebook computer, a mobile phone, a tablet computer, a PDA (Personal Digital Assistant), a POS (Point of Sales), an on-board computer, or the like.
  • the encoding module may be implemented by the following method.
  • the encoding module includes: a grouping unit and an encoding unit.
  • the grouping unit is configured to group the data stored in the local file to obtain K original data packets.
  • the coding unit is configured to perform fountain code encoding on the K original data packets to generate N coded packets. Where K is an integer greater than or equal to 2, and N is an integer greater than zero.
  • the sending module is further configured to stop sending the N encoded packets to the terminal after receiving the feedback information sent by the terminal, where the feedback information is that the terminal receives the pre- After the number of the encoded packets is set, the preset number is greater than the K.
  • the file downloading apparatus may further include: a first receiving module and a first decoding module.
  • the first receiving module is configured to receive the second fountain code data sent by the terminal, and the first decoding module is configured to decode the M encoded packets included in the received second fountain code data, and decode the Data corresponding to the second fountain code data; wherein M>M′, the M′ is the number of original data packets obtained by grouping the data in the process of generating the second fountain code data, wherein the M′ is An integer greater than or equal to 2.
  • file downloading device may further include:
  • the sending module is further configured to: when the data sent by the terminal in the terminal list is not received, send a download request to the server, where the download request carries a file identifier to be downloaded;
  • a second receiving module configured to receive the fountain code data of the file data corresponding to the file identifier to be downloaded sent by the server
  • a second decoding module configured to decode the file data of the file to be downloaded based on the S coded packets included in the fountain code data of the received file data
  • S >S′, where S′ is the number of original data packets obtained by grouping the file data of the file to be downloaded in the process of generating fountain code data of the file data, where S′ is greater than Or an integer equal to 2.
  • the second receiving module is further configured to receive scheduling information sent by the server, and send the fountain code data of the file data to the terminal specified by the scheduling information according to the scheduling information.
  • the file downloading apparatus may further include: a third receiving module, configured to receive a query request sent by the server, where the query request carries a file identifier to be queried;
  • the encoding module is further configured to: when the file data corresponding to the file identifier to be queried is locally stored, encode the file data of the file to be queried to generate corresponding fountain code data;
  • the sending module is further configured to send, to the server end, the fountain code data corresponding to the file to be queried.
  • a sending module configured to send, by using a user datagram protocol UDP, the first fountain code data to a terminal requesting to download the data in the terminal list.
  • the technical solution provided by the embodiment of the present application encodes the block data of the target file to be transmitted into the fountain code data, and continuously sends the data to the terminal requesting the download based on the characteristics of the fountain code data until the terminal receives the feedback information. Stop after, even in the case of poor network environment The part of the coded packet is lost, because the fountain code is continuously transmitted, the receiving terminal can continue to receive and can decode the corresponding block data based on the received preset number of encoded packets, and the technical solution provided by the embodiment of the present application is improved.
  • the reliability of the data transmission in addition, since the receiving terminal sends the feedback information only after receiving the preset number of encoded packets, the retransmission request is fed back as long as there is one transmission failure in the prior art.
  • the use of the fountain code reduces the transmission of feedback information in the channel, which helps to increase the channel capacity and make the network more robust.
  • file downloading device may implement the file downloading method provided in the first embodiment or the second embodiment.
  • file downloading method provided in the first embodiment or the second embodiment.
  • FIG. 7 is a schematic structural diagram of a file downloading apparatus provided in Embodiment 7 of the present application.
  • the file downloading apparatus provided in the seventh embodiment includes: a receiving module 701, an encoding module 702, and a sending module 703. among them,
  • the receiving module 701 is configured to receive a download request sent by the terminal, where the download request carries an identifier of the file;
  • the encoding module 702 is configured to: when the terminal that stores the file corresponding to the file identifier does not exist in the network, and locally store the file corresponding to the file identifier, encode the data in the file to generate the fountain code data, where
  • the fountain code data includes N coded packets, and N is an integer greater than zero;
  • the sending module 703 is configured to send the N coded packets to the terminal.
  • the technical solution provided by the embodiment of the present application encodes the block data of the target file to be transmitted into the fountain code data, and continuously sends the data to the terminal requesting the download based on the characteristics of the fountain code data until the terminal receives the feedback information. After stopping, even if the network packet environment is poor, part of the encoded packet is lost. Because the fountain code is continuously transmitted, the receiving terminal can continue to receive and can decode the corresponding block based on receiving the preset number of encoded packets. Data, it is obvious that the technical solution provided by the embodiment of the present application improves the reliability of data transmission; The feedback information is sent after receiving the preset number of coded packets, and the retransmission request is fed back as long as there is one transmission failure in the prior art. The embodiment of the present application reduces the feedback information in the channel by using the fountain code. The transmission helps to increase the channel capacity and make the network more robust.
  • file downloading device provided in this embodiment can implement the file downloading method provided in the third embodiment or the fourth embodiment.
  • file downloading method provided in the third embodiment or the fourth embodiment.
  • the eighth embodiment of the present application further describes the technical solution provided by the present application based on the file downloading apparatus provided in the foregoing seventh embodiment.
  • the eighth embodiment is based on the seventh embodiment of the present invention.
  • the encoding module may be implemented by the following method. Specifically, the encoding module includes: a grouping unit and an encoding unit.
  • the grouping unit is configured to group the data in the file to obtain K original data packets; the encoding unit is configured to perform the fountain code encoding on the K original data packets to generate N coded packets; wherein An integer greater than or equal to 2, N being an integer greater than zero.
  • the sending module is further configured to: after receiving the feedback information sent by the terminal, stop sending the N coded packets to the terminal; where the feedback information is that the terminal receives the preset The number of the encoded packets is sent, and the preset number is greater than the K.
  • the embodiment provides the file downloading apparatus, and further includes:
  • the sending module is further configured to send a query request to another terminal in the network when the terminal that stores the file corresponding to the file identifier does not exist in the network, and the file corresponding to the file identifier is not stored locally, where
  • the query request carries a file identifier of the file
  • the receiving module is further configured to: when the terminal that stores the file exists in the network, receive the fountain code data sent by the terminal;
  • a decoding module configured to decode data of the file based on the received L coded packets included in the fountain code data
  • the K is the data grouped in the process of generating the fountain code data The number of original data packets obtained, the K being an integer greater than or equal to two.
  • the sending module is specifically configured to send the N encoded packets to the terminal by using a user datagram protocol UDP.
  • the technical solution provided by the embodiment of the present application encodes the block data of the target file to be transmitted into the fountain code data, and continuously sends the data to the terminal requesting the download based on the characteristics of the fountain code data until the terminal receives the feedback information. After stopping, even if the network packet environment is poor, part of the encoded packet is lost. Because the fountain code is continuously transmitted, the receiving terminal can continue to receive and can decode the corresponding block based on receiving the preset number of encoded packets. Data, it is obvious that the technical solution provided by the embodiment of the present application improves the reliability of data transmission; in addition, since the receiving terminal sends feedback information only after receiving a preset number of encoded packets, it is only once in the prior art. The transmission fails to feed back a retransmission request. The embodiment of the present application reduces the transmission of feedback information in the channel by using the fountain code, which helps to improve the channel capacity and make the network more robust.
  • file downloading device provided in this embodiment can implement the file downloading method provided in the third embodiment or the fourth embodiment.
  • file downloading method provided in the third embodiment or the fourth embodiment.
  • a network system provided in Embodiment 9 of the present application includes a file downloading apparatus applicable to a terminal and a file downloading apparatus applicable to a server;
  • the file downloading device suitable for the terminal is used for:
  • the file downloading device suitable for the server side is used for:
  • the data in the file is encoded to generate fountain code data, wherein the fountain code data includes N coded packets, where N is an integer greater than zero;
  • the file downloading device applicable to the terminal may be a hardware entity or an application installed on the terminal device, and the file downloading device applicable to the server may be a hardware entity or an application installed on the server device.
  • the technical solution provided by the embodiment of the present application encodes the block data of the target file to be transmitted into the fountain code data, and continuously sends the data to the terminal requesting the download based on the characteristics of the fountain code data until the terminal receives the feedback information. After stopping, even if the network packet environment is poor, part of the encoded packet is lost. Because the fountain code is continuously transmitted, the receiving terminal can continue to receive and can decode the corresponding block based on receiving the preset number of encoded packets. Data, it is obvious that the technical solution provided by the embodiment of the present application improves the reliability of data transmission; in addition, since the receiving terminal sends feedback information only after receiving a preset number of encoded packets, it is only once in the prior art. The transmission fails to feed back a retransmission request. The embodiment of the present application reduces the transmission of feedback information in the channel by using the fountain code, which helps to improve the channel capacity and make the network more robust.
  • the file downloading device for the terminal included in the network system provided in this embodiment may implement the method provided in the foregoing Embodiment 1 or Embodiment 2.
  • the file downloading device for the server is included in the network system provided in this embodiment, and the method provided in the third embodiment or the fourth embodiment is implemented.
  • the specific process refer to the corresponding content in the foregoing embodiment. No longer.
  • FIG. 8 is a schematic structural diagram of a file download terminal according to Embodiment 10 of the present application, where the terminal may include:
  • One or more processors 801 and memory 802, one processor 801 is taken as an example in FIG.
  • the file downloading electronic device may further include: an input device 803 and an output device 804.
  • the processor 801, the memory 802, the input device 803, and the output device 804 can be connected by a bus or other means.
  • the memory 802 is used as a non-transitory computer readable storage medium for storing non-transitory software programs, non-transitory computer executable programs, and modules, such as program instructions/modules corresponding to the file downloading method in the embodiment of the present application.
  • the processor 801 executes various functional applications and data processing of the server by running non-transitory software programs, instructions, and modules stored in the memory 802, that is, the method downloading method of the above method embodiment is implemented.
  • the memory 802 may include a storage program area and an storage data area, wherein the storage program area may store an operating system, an application required for at least one function; the storage data area may store data created according to usage of the file downloading device, and the like.
  • memory 802 can include high speed random access memory, and can also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device.
  • the memory 802 can optionally include memory remotely located relative to the processor 801 that can be connected to the processing device of the list item operation over a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.
  • the input device 803 can receive the input numeric or character information and generate a key signal input related to user settings and function control of the file download device.
  • Output device 804 can include a display device such as a display screen.
  • the one or more modules are stored in the memory 802, and when executed by the one or more processors 801, perform a file download method in any of the above method embodiments.
  • the embodiment of the present application provides a non-volatile computer storage medium, where the computer storage medium stores computer-executable instructions, which can execute a file downloading method applicable to a terminal in any of the foregoing method embodiments.
  • FIG. 9 is a schematic structural diagram of a file download server according to Embodiment 12 of the present application, where the server may include:
  • One or more processors 901 and memory 902, one processor 901 is taken as an example in FIG.
  • the file downloading electronic device may further include: an input device 903 and an output device 904.
  • the processor 901, the memory 902, the input device 903, and the output device 904 can be connected by a bus or other means.
  • the memory 902 is used as a non-transitory computer readable storage medium for storing non-transitory software programs, non-transitory computer executable programs, and modules, such as program instructions/modules corresponding to the file downloading method in the embodiment of the present application.
  • the processor 901 executes various functional applications and data processing of the server by running non-transitory software programs, instructions, and modules stored in the memory 902, that is, implementing the above-described method embodiment file downloading method.
  • the memory 902 may include a storage program area and an storage data area, wherein the storage program area may store an operating system, an application required for at least one function; the storage data area may store data created according to usage of the file downloading device, and the like.
  • memory 902 can include high speed random access memory, and can also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device.
  • the memory 902 can optionally include memory remotely located relative to the processor 901 that can be connected to the processing device of the list item operation over a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.
  • the input device 903 can receive the input digital or character information and generate a key signal input related to user settings and function control of the file download device.
  • Output device 604 can include a display device such as a display screen.
  • the one or more modules are stored in the memory 902, and when executed by the one or more processors 901, execute the file download method in any of the above method embodiments.
  • the application embodiment provides a non-volatile computer storage medium storing computer-executable instructions that can execute a file downloading method applicable to a server side in any of the above-described embodiments of the method.
  • the device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, ie may be located A place, or it can be distributed to multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the embodiment. Those of ordinary skill in the art can understand and implement without deliberate labor.

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Abstract

Les modes de réalisation de la présente invention appartiennent au domaine technique des ordinateurs. La présente invention se rapporte à un procédé, à un dispositif et à un système destinés au téléchargement de données. Le procédé est applicable à un terminal et comprend : l'acquisition d'une liste de terminaux téléchargeant un même fichier ; le codage de données dans le fichier stocké localement en vue de générer des données de code de fontaine, les premières données de code fontaine comprenant N paquets codés, N étant un nombre entier supérieur à zéro ; et la transmission des N paquets codés aux terminaux dans la liste de terminaux demandant de télécharger les données. Les modes de réalisation de la présente invention augmentent la fiabilité de la transmission de données ; de plus, étant donné qu'un code fontaine est utilisé, la transmission des informations de rétroaction dans un canal est réduite, ce qui favorise une augmentation de la capacité de canal et augmente la robustesse d'un réseau.
PCT/CN2016/101090 2016-06-30 2016-09-30 Procédé, dispositif et terminal destinés au téléchargement de fichiers WO2018000647A1 (fr)

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