WO2009140842A1

WO2009140842A1 - Method and system for interactive error correction of file downloading

Info

Publication number: WO2009140842A1
Application number: PCT/CN2008/073748
Authority: WO
Inventors: 张朋飞
Original assignee: 中兴通讯股份有限公司
Priority date: 2008-05-21
Filing date: 2008-12-26
Publication date: 2009-11-26
Also published as: CN101277316A

Abstract

A method for interactive error correction of file downloading is provided. The method involves the following steps: a file distribution server transmits a file attribute table FAT comprising file repair service address information to a receiving terminal through a broadcast network; after starting the receiving task of file downloading, if file slice loss or error occurs during the file receiving process, the receiving terminal transmits a file repair request of repairing the file in which file slice loss or error has occurred to a file repair server according to the repair service address information in the FAT; the file repair server feeds back repair data to the receiving terminal after receiving the repair request; the receiving terminal repairs the file including file slice loss or error with the received repair data. The invention provides a selective error correction method for file data downloading service in mobile multimedia broadcasting, and provides an auxiliary error correction mechanism for downloading service in mobile multimedia broadcasting.

Description

Interactive error correction method and system for file downloading

Technical field

The present invention relates to the field of mobile multimedia broadcast technologies, and in particular, to an interactive error correction method and system for file downloading.

Background technique

Mobile multimedia broadcasting is a multimedia technology that has emerged in recent years. With a handheld terminal, you can watch multimedia services such as TV in the case of high-speed mobile. The terminal receives the multimedia service program list through the wireless broadcast channel, selects the channel that has the right to watch, and can receive and select the multimedia data of the channel to realize watching TV on the mobile terminal.

China Mobile Multimedia Broadcasting (CMMB) technology is the latest development of mobile multimedia broadcasting technology. Based on OFDM (Orthogonal Frequency Division Multiplexing) modulation technology, mobile multimedia services will be adopted by downlink broadcasting. Sending to the receiving terminal, in order to save the power consumption of the receiving terminal, the multimedia broadcast service data is sent in a time division manner.

The CMMB broadcast channel frame consists of a control logical channel (referred to as a control channel) and a service logical channel (referred to as a traffic channel). The first time slot (time slot 0) of the CMMB broadcast channel is a control logic channel for transmitting control information; the other time slots are service logical channels for transmitting mobile multimedia service data.

Control information and multimedia service data are transmitted in the form of multiplexed frames on the control logical channel and the service logical channel, respectively. Each multiplex frame occupies an integer number of time slots and consists of a multiplexed frame header and a payload. The load of the control logical channel multiplexing frame is composed of multiple control information tables; the payload of the service logical channel multiplexing frame is composed of multiple multiplexed subframes, and the number of multiplexed subframes is indicated in the multiplexed frame header; The multiplex sub-frames are composed of a multiplex sub-frame header, a video segment, an audio segment, and a data segment, and each segment (video segment, audio segment, data segment) is composed of a segment header and a plurality of segment units.

File downloading is an important function of mobile multimedia broadcasting. The standard GY/T 220.5-2008 "Mobile Multimedia Broadcasting Part 5: Data Broadcasting" defines the transmission mode and business mode of the file in detail. This includes providing services such as news content, government affairs, business information, entertainment games, weather forecasts, file downloads, etc. to the terminal. Supported file types include HTML (Hypertext Transfer Protocol), XML (Extensible Markup Language), and so on.

For file downloads, it's critical to ensure that each data slice is correct. DVB-H

FEC (Forward Error Correction) mechanism can be used in both (Digital Video Broadcasting-Handhelds) and CMMB standards to implement packet error correction without interaction. However, since the FEC mechanism is one-way, there may be cases where the error correction is unsuccessful. In addition, since FEC is optional in the standard, the broadcaster may not use this mechanism when distributing files; therefore, in the above two cases, error correction of data fragmentation cannot be achieved.

Summary of the invention

The invention provides an interactive error correction method and system for file downloading, which provides an auxiliary error correction mechanism for file data downloading services based on mobile multimedia broadcasting.

In order to solve the above technical problem, an interactive error correction method for file downloading according to the present invention includes the following steps: a file distribution server sends a file attribute table FAT including file repair service address information to a receiving terminal through a broadcast network;

After the receiving terminal downloads the receiving task, if the file is lost or the file is faulty during the file receiving process, the file is repaired according to the file repair service address information in the FAT, and the file repairing file is repaired. File repair request;

After receiving the file repair request, the file repair server feeds back the repair data to the receiving terminal; the receiving terminal uses the received repair data to repair the file with the missing or wrong file.

Further, the file repair request includes: file repair service address information, a file resource identification value of the file, and a file block identification value of the missing or erroneous file slice and the file slice identification value.

Further, the FAT sent by the file distribution server to the receiving terminal further includes the receiving terminal. The start and end points of the time to start the file repair service after the file download service starts.

Further, a method for transmitting repair data in interactive error correction of file downloading includes the following steps:

The file distribution server transmits the FAT including the file repair service address information to the receiving terminal through the broadcast network;

When the file repair server corresponding to the file repair service address receives the repair request sent by the receiving terminal according to the file repair service address information, the file repair data is fed back to the receiving terminal.

Further, a method for receiving repair data in an interactive error correction of a file download, after receiving a file download and receive task, if the receiving terminal has a file slice loss or a file slice error during file receiving, the file distribution server broadcasts according to the file distribution server. The file repair service address information in the FAT sent by the network sends a file repair request for repairing a file with a missing or wrong file to the file repair server; after receiving the repair data of the file fed back by the file repair server, the receiving terminal The file is fixed.

Further, the file repair request includes: file repair service address information, file file resource identifier value of the file, and a file block identifier value of the missing or erroneous file slice and the file slice identifier value.

Further, an interactive error correction system for file downloading, the system comprising a file distribution server, a file repair server and a receiving terminal, wherein:

a file distribution server, configured to send, by using a broadcast network, a FAT including file repair service address information to the receiving terminal;

The receiving terminal is configured to send a file fragment loss or an error to the file repair server according to the file repair service address information in the FAT after the file downloading and receiving task is started, if a file fragment is lost or a file fragment error occurs during the file receiving process. The file repair request for repairing the file; and receiving the repair data of the file sent by the file repair server, and repairing the file; the file repair server, configured to receive the file repair request of the receiving terminal, and provide feedback to the receiving terminal Repair data for the file.

Further, the repair request of the file used by the receiving terminal for sending includes: file repair service address information, a file resource identifier value of the file, and a file block identifier value of the missing or erroneous file slice and the file slice identifier value. Further, the FAT sent by the file distribution server to the receiving terminal further includes a time start point and an ending point of the receiving terminal starting the file repair service after the file download service starts.

Further, a system for repairing data in an interactive error correction of file downloading, the system comprising a file distribution server and a file repair server, wherein:

a file distribution server for including file repair service address information over a broadcast network

FAT is sent to the receiving terminal;

The file repair server is configured to: after receiving the file repair request sent by the receiving terminal according to the file repair service address information, and feeding back the repair data of the file to the receiving terminal.

Further, a receiving terminal for repairing data in the interactive error correction of the file downloading, after receiving the file downloading and receiving task, if the receiving terminal has a file slice loss or a file slice error during the file receiving process, the receiving terminal broadcasts according to the file distribution server. The file repair service address information in the FAT delivered by the network sends a file repair request to the file repair server for repairing a file with a missing or wrong file; the receiving terminal is further configured to receive the repair data of the file fed back by the file repair server, and The file is copied.

Further, the receiving terminal includes a file download abnormality detecting module, a file repair service address resolution module, a communication module, and a file repair module, where:

The file download abnormality detecting module is configured to detect a file piece loss or a file slice error occurring during the receiving of the file after the receiving terminal starts the file downloading and receiving task;

The file repair service address resolution module is configured to parse the file repair service address information in the FAT delivered by the file distribution server through the broadcast network;

a communication module, configured to send, according to the file repair service address information parsed by the file repair service address resolution module, a file repair request for repairing a file with missing or incorrect file files; and receiving the file repair server feedback Repair data for the file;

A file repair module for repairing the file based on the repair data of the file received by the communication module.

Further, the repair request of the file sent by the communication module includes: file repair service address information, a file resource identifier value of the file, and a file block identifier value of the missing or erroneous file slice and the file slice identifier value. The invention provides an interactive error correction method and system in a file data downloading process, which provides an optional error correction method for a file data downloading service of a mobile multimedia broadcast, and provides a download service based on mobile multimedia broadcasting. An auxiliary error correction mechanism.

BRIEF abstract

1 is a schematic structural diagram of an interactive error correction system for downloading a file according to an embodiment of the present invention; FIG. 2 is a schematic diagram showing a structure of a transmission system for repairing data in an interactive error correction of file downloading according to the present invention;

3 is a receiving terminal for repairing data in interactive error correction of file downloading according to the present invention; FIG. 4 is a flow chart of an interactive error correcting method for file downloading according to an application example of the present invention.

Preferred embodiment of the invention

The technical solutions of the present invention are described in detail below in conjunction with the accompanying drawings and specific embodiments. In the mobile multimedia broadcasting system, according to the provisions of the mobile multimedia broadcast data broadcasting standard GY/T 220.5-2008 ("Mobile Multimedia Broadcasting Part 5: Data Broadcasting"), the file mode data broadcasting service is composed of a series of discrete files. In addition to the data information, each file has a number of attribute information describing the file, such as file name, length, compression mode, etc. The terminal not only needs to receive the data correctly, but also receives the attribute information of the file, so that it can be restored to be consistent with the sender. File and directory structure; this file attribute description information is FAT. In order to implement the interactive repair service in CMMB, information about the interactive repair server must be given in some way. In this solution, the interactive file repair service address information is added in the FAT.

As shown in FIG. 1 , it is a system structure diagram of an interactive error correction system for downloading a file according to an embodiment of the present invention. The system includes a file distribution server, a file repair server, and a receiving terminal, where: a file distribution server is configured to broadcast The network sends a FAT (File Attribute Table) containing the file repair service address information to the receiving terminal, and sends the file data described in the FAT table; the FAT sent by the file distribution server to the receiving terminal further includes the receiving The start and end points of the time at which the terminal starts the file repair service after the file download service starts - The receiving terminal is configured to receive file fragmentation data from the broadcast network according to the FAT and reconstruct the file after starting the file download and receive task. If a file fragment loss or a file slice error occurs during file receiving, when the repairing task cannot be obtained through the broadcast network, the file repair service address information in the FAT is sent to the file repair server via the mobile communication network. A file repair request for repairing a lost or erroneous file; and receiving the repair data of the file delivered by the file repair server, and repairing the file;

And a file repair server, configured to receive a repair request of the receiving terminal, and feed back the repair data of the file to the receiving terminal.

As shown in FIG. 2, it is a schematic structural diagram of a system for transmitting repair data in an interactive error correction of a file download according to the present invention. The system includes a file distribution server and a file repair server, where: a file distribution server is used to broadcast a network. Sending the FAT including the file repair service address information to the receiving terminal; the file repair server, configured to receive, by the mobile communication network, the repair request sent by the receiving terminal according to the file repair service address information, and feed back to the receiving terminal Repair data for the file.

As shown in FIG. 3, the present invention implements a receiving terminal for repairing data in an interactive error correction of file downloading. After receiving a file downloading and receiving task, the receiving terminal may lose a file piece or a file piece during file receiving. In the error, when the repairing task cannot be obtained through the broadcast network, the file repair server sends the service repair address information to the file repair server through the mobile communication network according to the file repair service address information described in the FAT delivered by the broadcast network. The file is repaired by the file repair request; the receiving terminal is further configured to receive the repair data of the file fed back by the file repair server, and repair the file.

The receiving terminal includes a file download abnormality detecting module, a file repair service address resolution module, a communication module and a file repair module, wherein:

The file download abnormality detecting module is configured to detect a file slice loss or a file slice error occurring during the file receiving process after the receiving terminal starts the file download receiving task;

File repair service address resolution module, used to parse out the file distribution server through the broadcast network File repair service address information in the issued FAT;

a communication module, configured to send, according to the file repair service address information parsed by the file repair service address resolution module, a file repair request for repairing the lost or erroneous file piece to the file repair server through the mobile communication network; Receiving the repair data of the file fed back by the file repair server; the repair request includes: the file repair service address information, a file resource identifier value of the file, and a file block of the missing or erroneous file piece An identifier value and the file identifier value; the communication module sends a file repair request for repairing the lost or erroneous file to the file repair server by using an HTTP protocol;

And a file repairing module, configured to repair the file according to the repair data of the file received by the communication module.

As shown in FIG. 4, it is a flowchart of an interactive error correction method for file downloading according to an application example of the present invention, which includes the following steps:

Step 401: The file distribution server sends, by using a broadcast network, a file attribute table including file repair service address information to the receiving terminal.

GY/T 220.5-2008 uses the XML Schema (model) to describe the data model of the file attributes. Here, the file repair service address information is described in this way. The interactive file repair service address information is divided into global and local according to the scope;

The global interactive file repair service address information is placed in the root element of the FAT.

Local interactive file repair service address information placed in FAI ( File Attribute

Information, file attribute information).

The scope of both follows the following rules:

• "Local Interactive File Repair Service Address Information" gives the interactive file repair service address information corresponding to the file described in the FAI, which is only for a certain file;

• "Global Interactive File Repair Service Address Information" gives the interactive file repair service address information for all the files described in the FAT table, acting on all the files described in the FAT table.

• When "local interactive file repair service address information" and "global interactive file repair" When the service address information "is present," the local interactive file repair service address information "overwrites the global interactive file repair service address information".

• When there is no "local interactive file repair service address information" in a FAI, and "global interactive file repair service address information" exists, the file described in the FAI uses "global interactive file repair service" Address information "as the address of your own interactive repair server;

• When "Partial Interactive File Repair Service Address Information" and "Global Interactive File Repair Service Address Information" do not exist, the interactive repair is not supported.

The syntax of the modified FAT root element is defined as follows:

</sequence>

Attribute name="Max Version" type="unsignedByte" use="required"/> <attribute name="Min Version" type="unsignedByte" use="required"/>

</complexType>

</element>

The semantic definition of the root element is shown in the table below.

IW . I 6

OZ

</ ₍₁ 9dX OJUJUOTJBJU9UI§9S: jSB0BJB ₍₁ = 9dXj

OJUJUOTJBJU9UI§9S ₍₁ =9UIBU JU9UI9|9>

</ ₍₁ 9dX OJUJJU9JUO3: jSB0BJB ₍₁ = 9dXj ₍₁ OJUJJU9JU03 ₍₁ = 9UIBU JU9UI9|9>

Ju9iu9|9>

<90U9tlb9S> ς

<"3 (工iY = 3ureu 3 (工Χ3ΐ<3ιποο> :丄.f 3⁄4

8 L£L0/800Z l3/13d 80 /600Ζ OAV Field semantics

Transferlnfo transports information elements, TransferlnfoType type.

ContentInfo element content element, ContentlnfoType type.

SegmentationInfo The split information element, SegmentationInfoType.

FECInfo FEC information element, FECInfoType type.

ProtectionInfo protection information element, ProtectionInfo type.

FRAI file repair service address information element, FRAIType type. Resource—ID The resource identifier attribute, unsignedShort type, represents the file resource corresponding to this FAI element. This element has the same value as the Resource ID field in Table A6.

Updatelndex update sequence number attribute, unsignedByte type, value range 0 ~

15 , indicates the update sequence number of this FAI element, which is consistent with the value of the "update sequence number" field in Table A6.

Table 2 FAIType semantic table

The FRAI (File Repair Address Information) element describes the file repair service address information. If the element does not exist, it indicates that the data broadcast file download service does not support interactive file repair. FRAIType is the data type definition of this element, and the syntax of FRAIType is defined as follows.

</ complexType>

The semantic definition of FRAIType is shown in the table below.

OffsetTime How long does the receiving terminal wait for the file to start (in seconds)?

You can start the interactive file repair business; unsignedlnt type.

MaxRandomTime To avoid upstream channel congestion, the receiving terminal is

[OffsetTime, OffsetTime+MaxRandomTime] Start a interactive file repair service at a random time in the time period, unsignedlnt type, in seconds.

FRAIType semantic definition table

Step 402: After receiving the file download and receive task, the receiving terminal may continue to obtain the data of the file from the file distribution server through the broadcast channel after the file receiving process is deleted, and the repair processing may be performed. And sending, according to the received file repair service address information of the FRAI element in the FAT, a file repair request for repairing the lost or erroneous file to the file repair server through the mobile communication network. The receiving terminal accesses the file repair server by accessing the specified WAP webpage (via the WAP gateway).

The following situations need to be avoided during the file repair process:

(1) A plurality of receiving terminals simultaneously initiate repair services at the same time, causing congestion of the uplink channel; (2) the file repair server simultaneously responds to the repair service of the plurality of receiving terminals, causing congestion of the downlink channel;

(3) The file repair server simultaneously handles the repair service of too many receiving terminals, causing overload. In order to avoid the above situation, after receiving the file download and receive task, the receiving terminal may find that a certain file download is abnormal, and can no longer continue to obtain relevant data from the broadcast channel for repair processing, which may be some random time after starting the service. Start an interactive repair business within.

OffsetTime: It is given how long (in seconds) the receiving terminal can start the interactive file repair service after the file download service starts. This time can be related to the length of time that the data download service is transmitted in the broadcast channel: If a file is repeatedly transmitted in the broadcast channel within a certain period of time, the terminal should try to receive data from the broadcast channel for repair. To reduce the consumption of the interactive channel; when there are multiple services at the same time, different OffsetTime values can be assigned to each service.

MaxRandomTime: In order to avoid traffic congestion caused by multiple receiving terminals concurrently, the receiving terminal should be randomly selected in the [OffsetTime, OffsetTime+MaxRandomTime] time period. Start the interactive file repair business at any time. This random value is obtained by an algorithm which is determined by the specific implementation and is not described here.

The interactive repair request message format of the receiving terminal:

In the interactive repair service, the HTTP protocol is used between the receiving terminal and the file repair server. For example: If in the CMMB file download service, the RepairServerURI=www.zte.com.cn/cmmb_example/repair-script of the file repair server is given by FAT, the resource identifier of the file to be repaired in the FAT is resource— ID=10, the files to be repaired belong to two partitions, and the block ID and slice ID are: block_ID=0, Section_ID=10, and block_ID=2, Section-ID=15; The file repair request message sent by the receiving terminal to the repair server is: GET / cmmb— example /repair— script? resource—ID=10&block—ID=0; Section—ID=10&block—ID=2; Section—ID=15HTTP /1.1

Host: www.zte.com.cn

The file repair request message contains the following:

( The address information of the 1 M ¹ reply request is www.zte.com.cn/cmmb— example/repair— script; the file repair service address information is obtained from the RepairServerURI field of the FRAI element in the FAT; for example, the FAR is given by the FRAI element The RepairServerURI is www.zte.com.cn/cmmb— example/repair—script, then the host (Host) address of the file repair server is parsed from: www.zte.com.cn, the path of the file repair service on the host For: cmmb— example/repair— script;

(2) Parameters: a file resource ID and one or more file fragmentation description information, where: the file resource ID (resource_ID) is a resource identification value of the file to be repaired;

The file fragmentation description includes a file block identification value (block_ID) and a file slice identification value (Section ID), which are connected by a "&" connector.

When there are multiple shards in the same block, you need to improve the efficiency by writing as follows: For example, the 10th to 16th shards of the block with the file block ID 0 need to be repaired. The file shard is described as:

Block— ID=0; Section— ID= 10-16 If the 5th slice of the block with the file block ID is 0, the 10th slice, and the 13th slice need to be duplicated, the file slice is described as:

Block— ID=0; Section—ID=5, 10, 13

If all the shards after the 5th shard of the block with the file block ID of 0 need to be repaired, the file shard is described as:

Block— ID=0; Section— ID=5+

If all shards of a block with a file block ID of 0 require ^ 爹 '爹 complex, the file shard is described as: block_ID=0

If all shards with a file block ID of 3 to a file block ID of 5 require ^ί'爹, the file shard is described as:

Block— ID=3-5

If the file block ID is 3, the file block ID is 5, and all the fragments with the file block ID of 8 need to be fixed, the file fragmentation is described as:

Block— ID=3, 5, 8

If all shards of all file blocks with a file block ID of 3 need to be fixed, the file shard is described as:

Block— ID=3+

Step 403: After receiving the repair request of the receiving terminal, the file repair server feeds back the repair data of the file to the receiving terminal.

When receiving the repair request from the receiving terminal, the file repair server responds to the receiving terminal if the request of the receiving terminal meets the requirements, and the response message is divided into two types: success and failure:

403.1, success message:

The format is: HTTP header + file repair data payload (HTTP payload).

The HTTP header contains the following sections:

(1) HTTP status encoding, set to "200 OK";

(2) HTTP payload type, set to application/octet-stream; (3) The encoding format of the payload content is set to "binary";

(4) The length of the HTTP payload.

The HTTP header of the response message is as follows:

HTTP/1.1 200 OK

Content-Type: application/ octet-stream

Content-Transfer-Encoding: binary

Content-length: The length of the payload.

The HTTP payload portion is encapsulated in accordance with the encapsulation structure of the file slice transmission defined by the CMMB standard data broadcast portion.

403.2, Failure message: If the file repair server finds that the request of the receiving terminal is abnormal, it sends a failure message to the receiving terminal according to the HTTP protocol. For the specific message format, refer to the HTTP protocol.

Step 404: After receiving the repair data of the file sent by the file repair server, the receiving terminal repairs the file.

In the above implementation or application example, the file distribution server and the file repair server can be integrated into one server.

The above interactive file download repair mechanism is optional, and it is described in the file attribute table of the CMMB standard data broadcast service whether a data broadcast file download service supports an interactive repair mechanism.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.

Claims

Claim

An interactive error correction method for file downloading, comprising the steps of: sending, by a file distribution server, a file attribute table FAT including file repair service address information to a receiving terminal through a broadcast network;

After the receiving terminal downloads the receiving task, if the file is lost or the file is in the process of receiving the file, the file is sent to the file repair server according to the file repair service address information in the FAT. a file repair request for repair;

After receiving the file repair request, the file repair server feeds back the repair data to the receiving terminal;

The receiving terminal repairs the file in which the file fragment is missing or is incorrect with the received repair data.

2. The method according to claim 1, wherein the file repair request comprises: the file repair service address information, a file resource identifier value of the file, and a file block identifier of the missing or erroneous file slice. The value and the file identifier value.

The method according to claim 1, wherein the FAT sent by the file distribution server to the receiving terminal further includes a start point and an ending point of the time at which the receiving terminal starts the file repair service after the file download service starts. .

4. A method for transmitting repair data in interactive error correction of file downloading, characterized in that it comprises the following steps:

After receiving the repair request sent by the receiving terminal according to the file repair service address information, the file repair server corresponding to the file repair service address feeds back the repair data of the file to the receiving terminal.

5. A method for receiving repair data in interactive error correction of file downloading, characterized in that: after receiving a file downloading and receiving task, the receiving terminal distributes the file according to the file if a file piece is lost or a file piece error occurs during file receiving. File repair in the FAT delivered by the server through the broadcast network The service address information sends a file repair request to the file repair server for repairing the file with the missing or the wrong file piece; the receiving terminal receives the repair data of the file fed back by the file repair server, and repairs the file. .

The method according to claim 5, wherein the repair request of the file comprises: the file repair service address information, a file resource identifier value of the file, and a file block of the missing or erroneous file piece. The identity value and the file slice identity value.

7. An interactive error correction system for file downloading, characterized in that the system comprises a file distribution server, a file repair server and a receiving terminal, wherein:

The file distribution server is configured to send, by using a broadcast network, a FAT including file repair service address information to the receiving terminal;

The receiving terminal is configured to send a file to the file repair server according to the file repair service address information in the FAT, after the file downloading and receiving task is started, if a file fragment is lost or a file fragment occurs during the file receiving process. A file repair request for repairing a lost or erroneous file; and receiving the repair data of the file delivered by the file repair server, and repairing the file;

The file repair server is configured to receive a file repair request of the receiving terminal, and feed back the repair data of the file to the receiving terminal.

The system according to claim 7, wherein the repair request of the file used by the receiving terminal comprises: the file repair service address information, a file resource identifier value of the file, and the loss Or the file block identification value of the wrong file slice and the file slice identification value.

The system according to claim 7, wherein the FAT sent by the file distribution server to the receiving terminal further includes a time start point of the receiving terminal to start the file repair service after the file download service starts. End point.

10. A system for transmitting repair data in interactive error correction of file downloading, characterized in that the system comprises a file distribution server and a file repair server, wherein:

The file repair server, configured to receive the receiving terminal according to the file repair service After the file repair request sent by the service address information, the repair data of the file is fed back to the receiving terminal.

11. A receiving terminal for repairing data in interactive error correction of file downloading, wherein: after receiving a file downloading and receiving task, the receiving terminal, if a file piece is lost or a file piece error occurs during file receiving, The file distribution server sends a file repair request for repairing a file with a missing or erroneous file to the file repair server through the file repair service address information in the FAT delivered by the broadcast network; the receiving terminal is further configured to receive the file repair The server retrieves the repair data of the file and repairs the file.

The receiving terminal according to claim 11, wherein the receiving terminal comprises a file downloading abnormality detecting module, a file repairing service address analyzing module, a communication module and a file repairing module, wherein:

The file download abnormality detecting module is configured to detect a file slice loss or a file slice error occurring during the file receiving process after the receiving terminal starts the file downloading and receiving task;

The communication module is configured to send, according to the file repair service address information parsed by the file repair service address resolution module, a file repair request for repairing a file with a missing or wrong file to the file repair server; The repair data of the file fed back by the file repair server;

The file repairing module is configured to repair the file according to the repair data of the file received by the communication module.

The receiving terminal according to claim 11, wherein the repair request of the file used by the communication module comprises: the file repair service address information, a file resource identifier value of the file, and the The file block ID value of the missing or erroneous file and the file ID value.