CN101043296A - Method for requesting retransmission data, data retransmitting method and data transmission system - Google Patents
Method for requesting retransmission data, data retransmitting method and data transmission system Download PDFInfo
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- CN101043296A CN101043296A CN 200710097228 CN200710097228A CN101043296A CN 101043296 A CN101043296 A CN 101043296A CN 200710097228 CN200710097228 CN 200710097228 CN 200710097228 A CN200710097228 A CN 200710097228A CN 101043296 A CN101043296 A CN 101043296A
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Abstract
The invention relates to data retransmit technology, it discloses a method of requiring data retransmit that comprises: receiving data report comes from receiver, obtaining the clean load and nameplate of the data report; if the clean load of said data report contains error byte, and the nameplate is right, then the position of error byte is marked, obtaining the ESI of coding symbol of the data report and SBN of source module from the nameplate of the data report, and dividing the clean load of the data report into at least two sections; obtaining the section of error byte based on the position of marked error byte; generating the file repairing requiring message, said message includes the mark information of error byte, and said ESI and SBN; sending said file repairing requiring message to transmitter. The invention also discloses a data retransmit method, sender, receiver and data transmission system. The invention can decrease the network resource occupied by data transmission.
Description
Technical field
The present invention relates to the data re-transmission technology, relate in particular to method, data repeating method, transmitter, receiver and the data transmission system of request retransmission data.
Background technology
Digital video broadcasting-hand-hold type (Digital Video Broadcasting Handled, abbreviation DVB-H) standard is the transmission standard that European digital television standard is organized as provides multimedia service to formulate by the received terrestrial digital broadcasting network to portable, handheld terminal, complete agreement Network Based (the Internet Protocol of this standard, be called for short IP) and formulate, the business of carrying out comprises flow-type business and file transfer service.Wherein, file transfer service comprises the download of software, audio/video program etc., use unidirectional file transfer (File delivery over Unidirectional Transport is called for short FLUTE) agreement, terminal need could be used this document behind the whole file of complete reception.
In the DVB-H standard, for the file of a needs transmission, transmitter at first is divided into multiple source module (Source Block) with it by pre-sizing; For each source module, be divided into a plurality of coded identifications by pre-sizing again; After carrying out forward error correction coding, each coded identification as payload, is used FLUTE, User Datagram Protoco (UDP) (User Datagram Protocol is called for short UDP) and IP agreement to encapsulate the back successively and sent as a datagram; Wherein, each source module has corresponding source module numbering (Source Block Number is called for short SBN), and each coded identification also has corresponding codes symbol logo (Encoding Symbol Identifier is called for short ESI); The SBN of the ESI of coded identification and affiliated source module is loaded in the FLUTE header, is the uniquely tagged of coded identification in the datagram.
In existing DVB-H standard, after receiver carries out multi-protocols decapsulation and error correction decode to received datagram, if wrong byte in the datagram, receiver can directly abandon this datagram, and, comprise the sign of coded identification in this datagram and the numbering of affiliated source module in this request to transmitter transmission file repairing requiring message; Transmitter is after receiving file reparation request, and the coded identification that resends by numbering of the source module in the file and the indication of coded identification sign to receiver is the datagram of payload.
In carrying out the invention process, the inventor finds that there are the following problems at least in the prior art: because each datagram that receiver abandons is least unit with the coded identification, therefore, the data retransmission newspaper of being asked in the file repairing requiring message that receiver sends also is to be least unit with the coded identification, and transmitter is after receiving file repairing requiring message, and the data retransmission newspaper that sends to receiver also is least unit accordingly with the coded identification; Under this mechanism, even have only seldom mistake in datagram, also must retransmit whole coded identification, this just need take more Internet resources; And ask to carry out file simultaneously when repairing as a plurality of receivers, such re-transmission even may cause the obstruction of network.
Summary of the invention
First technical problem that embodiments of the invention will solve provides the method and the receiver of request retransmission data, can reduce data retransmission amount, the shared Internet resources of reduction data re-transmission of asking to transmitter.
Second technical problem that embodiments of the invention will solve is that data repeating method, transmitter and data transmission system are provided respectively, can reduce the shared Internet resources of data re-transmission.
For solving above-mentioned first technical problem, embodiments of the invention provide following technical scheme:
A kind of method of request retransmission data comprises:
Receive the datagram that transmitter sends, obtain the payload and the header of this datagram;
If include error byte in the payload of described datagram, and header is correct, then mark is carried out in the position of described error byte, from the header of this datagram, obtain the coded identification sign ESI of coded identification in this datagram and the source module numbering SBN of affiliated source module, and the payload of this datagram is divided at least two segmentations;
In described two segmentations, obtain the segmentation at error byte place at least according to the position of the error byte of mark;
Spanned file is repaired request message, carries label information and the described ESI and the SBN of described error byte place segmentation in the described message;
Send described file repairing requiring message to described transmitter.
A kind of receiver comprises:
Receiving element is used to receive the datagram that transmitter sends;
First processing unit is used for obtaining from described datagram the payload and the header of this datagram;
Judging unit be used for judging whether described payload comprises error byte, and whether header is correct, and the output judged result;
Second processing unit, being used in described judged result is under the situation that is, mark is carried out in the position of described error byte, obtains the ESI of coded identification in this datagram and the SBN of affiliated source module from described header, and described payload is divided at least two segmentations; And the segmentation of in described segmentation, obtaining the error byte place according to the position of the error byte of mark;
Message generation unit is used for spanned file and repairs request message, carries label information and the described ESI and the SBN of described error byte place segmentation in the described message;
Transmitting element is used for sending described file repairing requiring message to described transmitter.
For solving above-mentioned second technical problem, embodiments of the invention provide following technical scheme:
A kind of data repeating method comprises:
Reception is from the file repairing requiring message of receiver, carries the ESI of coded identification under the label information, this segmentation of error byte place segmentation in the datagram that receiver receives and the SBN of affiliated source module in the described message;
Obtain by the label information of described error byte place segmentation, described ESI and the indicated segment data of SBN;
Generation comprises the data retransmission newspaper of the segment data of described segmentation markers information points, described ESI and SBN;
Send described data retransmission newspaper to described receiver.
A kind of transmitter comprises:
Receiving element is used to receive the file repairing requiring message from receiver, carries the ESI of coded identification under the label information, this segmentation of error byte place segmentation in the datagram that receiver receives and the SBN of affiliated source module in the described message;
The segment data acquiring unit is used to obtain by the label information of described error byte place segmentation, described ESI and the indicated segment data of SBN;
The datagram generation unit, the data retransmission that is used to generate the segment data, described ESI and the SBN that comprise described label information sensing is reported;
Transmitting element is used for sending to described receiver the datagram of described generation.
A kind of data transmission system comprises transmitter and receiver; Wherein:
Described receiver is used to receive the datagram that described transmitter sends, from described datagram, obtain payload and header, in described payload, comprise error byte, and when header is correct, mark is carried out in position to described error byte, from described header, obtain the ESI of coded identification in this datagram and the SBN of affiliated source module, and described payload is divided at least two segmentations; And, in described a plurality of segmentations, obtain the segmentation at error byte place according to the position of the error byte of mark; Also be used for spanned file and repair request message, and send this message, carry label information and the described ESI and the SBN of described error byte place segmentation in the described message to described transmitter;
Described transmitter is used to receive described file repairing requiring message, obtains label information and described ESI and the indicated segment data of SBN by the error byte place segmentation in the described file repairing requiring message; And generate the data retransmission newspaper comprise segment data, described ESI and SBN that described label information points to, and send described data retransmission newspaper to described receiver.
From above first and second technical schemes as can be seen, embodiments of the invention have the following advantages: because when the header of the datagram that is received correctly comprises error byte in the payload, payload is divided into a plurality of segmentations, and in file repairing requiring message, also carry the label information of error byte place segmentation, only ask transmitter to retransmit the segmentation at error byte place, rather than ask whole coded identification is retransmitted, therefore can reduce data retransmission amount to the transmitting terminal request; Like this, transmitter only need retransmit the segment data at error byte place indicated in this request to receiver, rather than whole coded identification all retransmitted, thereby make to retransmit and reduce for the data volume of receiver, thereby can reduce the shared Internet resources of data re-transmission.
From above the 3rd to the 5th technical scheme as can be seen, embodiments of the invention have the following advantages: because after receiving file repairing requiring message, only retransmit the segment data at error byte place indicated in this request to receiver, rather than whole coded identification all retransmitted, make like this to retransmit and reduce for the data volume of receiver, therefore can reduce the shared Internet resources of data re-transmission.
Description of drawings
Fig. 1 is the flow chart of the method for the embodiment of the invention one request retransmission data;
Fig. 2 is the flow chart of the method for the embodiment of the invention two request retransmission data;
Fig. 3 is the structure chart of the embodiment of the invention four receivers;
Fig. 4 is the flow chart of the embodiment of the invention six data repeating methods;
Fig. 5 is the structure chart of the embodiment of the invention eight transmitters;
Fig. 6 is the structure chart of the embodiment of the invention nine transmitters;
Fig. 7 is the structure chart of the embodiment of the invention ten data transmission systems.
Embodiment
Below in conjunction with accompanying drawing, the preferred embodiment of method, data repeating method, transmitter, receiver and the data transmission system of request retransmission data provided by the invention is described in detail.
The method of embodiment one, a kind of request retransmission data with reference to figure 1, comprises following flow process:
The datagram that S1, reception transmitter send;
S2, the payload that obtains described datagram and header;
S3, if the payload of described datagram in include error byte, and header is correct, then mark is carried out in the position of described error byte, from the header of this datagram, obtain the ESI of coded identification in this datagram and the SBN of affiliated source module, and the payload of this datagram is divided at least two segmentations;
Wherein, it can be according to pre-configured chopping rule the payload of this datagram (for example to be divided at least two segmentations that the payload of datagram is divided at least two segmentations, payload in this datagram is equally divided into the segmentation of predetermined number), also can be the payload of this datagram to be divided at least two segmentations, guarantee wherein not comprise error byte at least one segmentation according to the distribution situation of the error byte of mark;
S4, in described two segmentations, obtain the segmentation at error byte place at least according to the position of the error byte of mark;
S5, spanned file are repaired request message, carry label information and the described ESI and the SBN of described error byte place segmentation in the described message;
S6, send described file repairing requiring message to described transmitter.
Can carry the chopping rule marker bit in the described file repairing requiring message, this marker bit indication is to adopt pre-configured chopping rule to payload segment, and still the distribution situation according to error byte adopts self-defining segmented mode.
From present embodiment as can be seen, because when the header of the datagram that is received correctly comprises error byte in the payload, payload can be divided into a plurality of segmentations, and in file repairing requiring message, also carry the label information of error byte place segmentation, thereby only ask transmitter to retransmit the segmentation at error byte place, rather than ask whole coded identification is retransmitted, therefore can reduce data retransmission amount to the transmitting terminal request.
One of ordinary skill in the art will appreciate that, realize that all or part of step in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in the computer read/write memory medium, this program comprises the steps: to receive the datagram that transmitter sends when carrying out; Obtain the payload and the header of described datagram; If include error byte in the payload of described datagram, and header is correct, then mark is carried out in the position of described error byte, from the header of this datagram, obtain the ESI of coded identification in this datagram and the SBN of affiliated source module, and the payload of this datagram is divided at least two segmentations; In described two segmentations, obtain the segmentation at error byte place at least according to the position of the error byte of mark; Spanned file is repaired request message, carries label information and the described ESI and the SBN of described error byte place segmentation in the described message; Send described file repairing requiring message to described transmitter.Described storage medium, as: ROM/RAM, disk, CD etc.
The method of embodiment two, a kind of request retransmission data with reference to figure 2, comprises following flow process:
The datagram that A1, reception transmitter send;
Transmitter is divided into the multiple source module with file to be sent, again each source module is divided into a plurality of coded identifications, after carrying out forward error correction coding with each coded identification as payload, carry out successively sending to receiver as a datagram after FLUTE, UDP and the IP protocol encapsulation; Wherein, the SBN of the ESI of coded identification and affiliated source module is loaded in the FLUTE header, is used for the coded identification in unique flag data newspaper;
A2, received datagram is carried out IP, UDP and the decapsulation of FLUTE agreement successively, and error correction decode;
A3, each datagram to receiving are obtained payload and header respectively, judge whether its header recovers correctly, if recover correct, carry out A4; Otherwise, abandon this datagram, obtain the ESI and the SBN of this datagram correspondence, described ESI and SBN are recorded in the tabulation of data retransmission newspaper, carry out A7;
A4, continuation are judged if include error byte in the payload of this datagram, then mark are carried out in the position of this error byte, and obtain the ESI of coded identification the datagram and the SBN of affiliated source module from header portion;
A5, the payload part of described datagram is equally divided into the segmentation of predetermined number;
The data length of the payload part of each datagram as a rule is (as 1000 bytes) of fixing, when header portion correctly includes error byte in the payload, data in the payload can be divided into the segmentation of certain-length (as 100 bytes), and be number-of-fragments of each segment assignments (Segment Number is called for short SN) in order; Following table 1 provides the composition that carries out datagram after the segmentation:
Table 1
| Header | Payload | ||||||
| IP | UDP | FLUTE | SN(1) | SN(2) | SN(3) | ...... | SN(n) |
A6, basis are obtained the segmentation at error byte place in the position of the error byte of mark, and in error reporting mark are carried out in described segmentation;
Error reporting is used for the label information of each datagram error byte place segmentation of recorder; In error reporting mark is carried out in the segmentation of error byte place and can adopt dual mode: a kind of mode is directly to write down the number-of-fragments of this segmentation; Another kind of mode is that a flag bit is all established in all segmentations, by flag bit to the segmentation at error byte place with do not comprise the mark of the segmentation property distinguished of error byte, for example, can be in the mark position 1 of error byte place segmentation, the mark position 0 that does not comprise the segmentation of error byte, following table 2 is identical with the data length of the coded identification of each datagram, and all is divided into 16 and is segmented into example, provides a kind of optional form of error reporting under this mode:
Table 2
| SBN | ESI | SN(1) | SN(2) | SN(3) | ...... | SN(16) |
| SBN1 | ESI1 | 0 | 1 | 1 | ...... | 0 |
| SBN1 | ESI2 | 0 | 0 | 1 | ...... | 1 |
| SBN2 | ESI1 | 0 | 1 | 0 | ...... | 1 |
| ...... | ...... | ...... | ...... | ...... | ...... | ...... |
A7, each datagram in the whole file carried out above-mentioned A3 to A6 after, judge whether the datagram of disappearance, if having, then obtain the ESI and the SBN of this datagram correspondence, described ESI and SBN are recorded in the tabulation of data retransmission newspaper; Otherwise, directly carry out A8;
A8, spanned file are repaired request message; Carry the label information of error byte place segmentation in the ESI of coded identification in the datagram that needs the part re-transmission and the SBN of affiliated source module, the described coded identification and the indication information that only retransmits error byte place segmentation in this coded identification in this message, the label information of described segmentation, ESI and SBN are recorded in the described error reporting; Wherein, the label information of segmentation can be to be the SN of each segment assignments in order;
Can also carry the chopping rule marker bit in the described file repairing requiring message, this marker bit indication is to adopt pre-configured chopping rule to payload segment;
The header error of certain datagram that receives when receiver, when the datagram of disappearance is perhaps arranged, also carry ESI and the SBN of affiliated source module and the indication information that this datagram is all retransmitted of coded identification in the datagram that needs all to retransmit in the described file repairing requiring message, described ESI and SBN are recorded in the tabulation of described data retransmission newspaper;
A9, send the file repairing requiring message that is generated to described transmitter;
Through above-mentioned steps A1 to A9, promptly realized to transmitter request retransmission data.Can further include following steps afterwards:
A10, receive the data retransmission newspaper that described transmitter sends, this datagram is payload with the segment data, and described segment data is indicated by the label information of described error byte place segmentation and ESI and the SBN corresponding with described segmentation;
A11, the data in this datagram are recombinated according to right-on segmentation in segmentation in the described data retransmission newspaper and the preceding respective datagram that once receives;
In also carrying the datagrams that need all to retransmit in the file repairing requiring message that sends to transmitter the ESI of coded identification and under when the SBN of source module and indication information that this datagram is all retransmitted, it is the data retransmission newspaper of payload that transmitter also sends with the coded identification of described ESI and SBN indication; Receiver recovers data wherein according to this data retransmission newspaper.
The method of embodiment three, a kind of request retransmission data, present embodiment and embodiment two are similar, and the main distinction is that the payload to datagram carries out the method difference of segmentation, comprises following flow process:
The datagram that P1, reception transmitter send;
Transmitter is divided into the multiple source module with file to be sent, again each source module is divided into a plurality of coded identifications, after carrying out forward error correction coding with each coded identification as payload, carry out successively sending to receiver as a datagram after FLUTE, UDP and the IP protocol encapsulation; Wherein, the SBN of the ESI of coded identification and affiliated source module is loaded in the FLUTE header, is used for the coded identification in unique flag data newspaper;
P2, received datagram is carried out IP, UDP and the decapsulation of FLUTE agreement successively, and error correction decode;
P3, each datagram to receiving are obtained payload and header respectively, judge whether its header recovers correctly, if recover correct, carry out A4; Otherwise, abandon this datagram, obtain the ESI and the SBN of this datagram correspondence, described ESI and SBN are recorded in the tabulation of data retransmission newspaper, carry out A7;
P4, continuation are judged if comprise error byte in the payload of this datagram, then mark are carried out in the position of this error byte, and obtain the ESI of coded identification the datagram and the SBN of affiliated source module from header portion;
P5, the payload of this datagram is divided at least two segmentations, and guarantees wherein not comprise error byte at least one segmentation according to the distribution situation of the error byte of mark;
Wherein, payload carried out segmentation after, each segmentation can have identical byte number, also different byte numbers can be arranged; When each segmentation has identical byte number, can write down the byte number in each segmentation, and be SN of each segment assignments in order, start byte that also can each segmentation is as the SN of this segmentation; When each segmentation has different byte numbers, can be directly with the start byte of each segmentation SN as this segmentation;
P6, basis are obtained the segmentation at error byte place in the position of the error byte of mark, and in error reporting mark are carried out in described segmentation;
In error reporting mark is carried out in the segmentation at error byte place and can adopt dual mode: a kind of mode is directly to write down the number-of-fragments of this segmentation; Another kind of mode is that a flag bit is all established in all segmentations, by flag bit to the segmentation at error byte place with do not comprise the mark of the segmentation property distinguished of error byte;
P7, each datagram in the whole file carried out above-mentioned P3 to P6 after, judge whether the datagram of disappearance, if having, then obtain the ESI and the SBN of this datagram correspondence, described ESI and SBN are recorded in the tabulation of data retransmission newspaper; Otherwise, directly carry out P8;
P8, spanned file are repaired request message; Carry the segmentation markers information at error byte place in the ESI of coded identification in the datagram that needs the part re-transmission and the SBN of affiliated source module, the described coded identification and the indication information that only retransmits error byte place segmentation in this coded identification in this message, the label information of described segmentation, ESI and SBN are recorded in the described error reporting;
Can carry the chopping rule marker bit in the described file repairing requiring message, this marker bit indication is to adopt self-defining segmented mode to payload segment;
Have identical byte number as if each segmentation after payload is carried out segmentation, the label information of segmentation described in this message can be to be the SN of each segment assignments in order, also carries the byte number of self-defining each segmentation this moment in this message; In addition, the label information of segmentation described in this message also can be the start byte of this segmentation and stop byte;
Have different byte numbers as if each segmentation after payload is carried out segmentation, the label information of segmentation described in this message can be the start byte of this segmentation and stop byte;
The header error of certain datagram that receives when receiver, when the datagram of disappearance is perhaps arranged, also carry ESI and the SBN of affiliated source module and the indication information that this datagram is all retransmitted of coded identification in the datagram that needs all to retransmit in the described file repairing requiring message, described ESI and SBN are recorded in the tabulation of described data retransmission newspaper;
P9, send the file repairing requiring message that is generated to described transmitter;
Through above-mentioned steps P1 to P9, promptly realized to transmitter request retransmission data.Can further include following steps afterwards:
P10, receive the data retransmission newspaper that described transmitter sends, this datagram is payload with the segment data, and described segment data is indicated by the label information of described error byte place segmentation and ESI and the SBN corresponding with described segmentation;
P11, the data in this datagram are recombinated according to right-on segmentation in segmentation in the described data retransmission newspaper and the preceding respective datagram that once receives;
In also carrying the datagrams that need all to retransmit in the file repairing requiring message that sends to transmitter the ESI of coded identification and under when the SBN of source module and indication information that this datagram is all retransmitted, it is the data retransmission newspaper of payload that transmitter also sends with the coded identification of described ESI and SBN indication; Receiver recovers data wherein according to this data retransmission newspaper.
Embodiment four, a kind of receiver with reference to figure 3, comprise receiving element 301, first processing unit 302, second processing unit 303, judging unit 304, message generation unit 309, transmitting element 310 and recovery unit 311:
Receiving element 301 is used to receive the datagram that transmitter sends;
Judging unit 304 is used for judging whether described payload comprises error byte, and whether header is correct, and the output judged result;
It is under the situation that is that indexing unit 305 is used in described judged result, and mark is carried out in the position of described error byte;
It is under the situation that is that sign acquiring unit 306 is used in described judged result, obtains the ESI of coded identification in this datagram and the SBN of affiliated source module from described header;
It is under the situation that is that segmenting unit 307 is used in described judged result, according to pre-configured chopping rule described payload is divided at least two segmentations;
Transmitting element 310 is used for sending described file repairing requiring message to described transmitter;
Wherein, the datagram that described receiving element receives comprises the data retransmission newspaper that described transmitter sends, and this datagram is to be segmented into payload, and described segment data is indicated by the label information of described error byte place segmentation, described ESI and SBN;
Embodiment five, a kind of receiver, present embodiment and embodiment four are basic identical, the difference part is, in the present embodiment, it is under the situation that is that segmenting unit is used in described judged result, distribution situation according to the error byte of mark is divided into a plurality of segmentations with described payload, guarantees wherein not comprise error byte at least one segmentation.
Embodiment six, a kind of data repeating method with reference to figure 4, may further comprise the steps:
B1, receive file repairing requiring message from receiver, carry in the described message coded identification under the label information, this segmentation of error byte place segmentation in the datagram that receiver receives ESI and under the SBN of source module;
Wherein, can also carry the chopping rule marker bit in the described file repairing requiring message, if this marker bit indication is to adopt pre-configured chopping rule to payload segment, described segmentation markers information can be to be the SN of each segment assignments in order; If this marker bit indication is to adopt self-defining segmented mode to payload segment, start byte that described segmentation markers information can be this segmentation and termination byte, also can be to be the SN of each segment assignments in order, also carry the byte number of self-defining each segmentation this moment in this message;
B2, obtain by the label information of described error byte place segmentation, described ESI and the indicated segment data of SBN;
B3, generation comprise the data retransmission newspaper of the segment data of described segmentation markers information points, described ESI and SBN;
B4, send described data retransmission newspaper to described receiver.
From present embodiment as can be seen, because after receiving file repairing requiring message, only retransmit the segmentation at error byte place indicated in this request to receiver, rather than whole coded identification all retransmitted, make like this to retransmit and reduce for the data volume of receiver, therefore can reduce the shared Internet resources of data re-transmission.
One of ordinary skill in the art will appreciate that all or part of step that realizes in the foregoing description method is to instruct relevant hardware to finish by program, described program can be stored in the computer read/write memory medium, this program is when carrying out, comprise the steps: to receive file repairing requiring message from receiver, carry in the described message coded identification under the label information, this segmentation of error byte place segmentation in the datagram that receiver receives ESI and under the SBN of source module; Obtain by the label information of described error byte place segmentation, described ESI and the indicated segment data of SBN; Generation comprises the data retransmission newspaper of the segment data of described segmentation markers information points, described ESI and SBN; Send described data retransmission newspaper to described receiver.Described storage medium, as: ROM/RAM, disk, CD etc.
Embodiment seven, a kind of data retransmission method may further comprise the steps:
C1, receive file repairing requiring message from receiver, carry in the described message coded identification under the numbering, this segmentation of the error byte place segmentation that receiver receives ESI and under the SBN of source module and the indication information that only retransmits error byte place segmentation in this datagram;
The header error of certain datagram that receives when receiver, when the datagram of disappearance is perhaps arranged, also carry in the described file repairing requiring message that receives coded identification in the datagrams that need all to retransmit ESI and under the SBN of source module, and the indication information that this datagram is all retransmitted;
C2, judge if carry the indication information that only retransmits error byte place segmentation in certain datagram in the described file repairing requiring message, then obtain by the ESI of coded identification under the numbering of the error byte place segmentation corresponding, this segmentation with this indication information and under the indicated segment data of SBN of source module;
C3, judgement are if also carry the indication information that certain datagram is all retransmitted in the described file repairing requiring message, then obtain and this datagram corresponding codes symbol, the SBN of source module was indicated under described coded identification was specifically reached by the ESI with this indication information corresponding codes symbol;
C4, the segment data that generates and obtained respectively, and/or the data retransmission of coded identification correspondence newspaper, described datagram can comprise following field:
Type indication (Type Indicator): the data that are used for the designation data newspaper are based on segmentation, also are based on coded identification;
Length Indication (Length Indicator): the data length that is used for the designation data newspaper; Optional a kind of mode is to represent with the number of coded identification, and for example, if stipulated that the data length of a coded identification is 1000 bytes, and " Length Indication " field is 3, represents that then the data length in this datagram is 3000 bytes;
Forward error correction verification payload sign (FEC Payload ID): load the numbering of coded identification and the numbering of the affiliated source module of this coded identification; When the data in the datagram are based on segmentation, load the ESI of the affiliated coded identification of first segmentation and the SBN of affiliated source module, when the data in the datagram are based on coded identification, load the ESI of first coded identification and the SBN of affiliated source module;
Segmentation or coded identification (Segments or Encoding Symbols): the payload of loading data newspaper; When the data of datagram transmission are based on segmentation, in this field, load the segment data in the coded identification, each segment data can be according to source module numbering and coded identification homogeneous phase simultaneously the big person of number-of-fragments back, source module number coded identification when identical number big person after, source module number big person after sequence arrangement; When the data of datagram transmission are based on coded identification, in this field, load complete coded identification; If the data length of indicating in " Length Indication " field is greater than the data length of a coded identification, load a plurality of coded identifications in this field, each coded identification can be according to source module number coded identification when identical number big person back, source module number big person after order load;
In addition, when loading segment data in this field, each segmentation that belongs to same coded identification is loaded in the same datagram, if after belonging to the segmentation of same coded identification in this field and being loaded, data length does not reach the indicated length of " Length Indication " field as yet, can continue to load the segmentation that belongs to other coded identifications in this field; After if the segment data that receiver is asked has all been loaded, data length does not reach the indicated length of " Length Indication " field yet, then can duplicate the segmentation of having loaded, the data length in this field reaches the indicated length of " Length Indication " field;
C5, send the data retransmission newspaper that is generated to described receiver.
Embodiment eight, a kind of transmitter with reference to figure 5, comprise receiving element 601, segment data acquiring unit 602, datagram generation unit 603 and transmitting element 604:
Receiving element 601 is used to receive the file repairing requiring message from receiver, carry in the described message coded identification under the label information, this segmentation of error byte place segmentation in the datagram that receiver receives ESI and under the SBN of source module;
Segment data acquiring unit 602 is used to obtain by the label information of described error byte place segmentation, described ESI and the indicated segment data of SBN;
Transmitting element 604 is used for sending described data retransmission newspaper to described receiver.
Embodiment nine, a kind of transmitter with reference to figure 6, comprise receiving element 701, segment data acquiring unit 702, datagram generation unit 703, transmitting element 704 and coded identification acquiring unit 705:
Receiving element 701 is used to receive the file repairing requiring message from receiver, carry in the described message coded identification under the label information, this segmentation of the segmentation at error byte place in the datagram that receiver receives ESI and under the SBN of source module;
Segment data acquiring unit 702 is used to obtain by the label information of described error byte place segmentation, described ESI and the indicated segment data of SBN;
Transmitting element 704 is used for sending described data retransmission newspaper to described receiver;
In addition, also carry in the file repairing requiring message that receiving element 701 receives coded identification in the datagrams that need all to retransmit ESI and under the SBN of source module, and the indication information that this datagram is all retransmitted;
Coded identification acquiring unit 705 is used to obtain by described ESI and the indicated coded identification of SBN;
The datagram that datagram generation unit 703 generates also comprises: with described coded identification is the data retransmission newspaper that comprises described ESI and SBN that payload generates;
The datagram that transmitting element 704 sends also comprises: with described coded identification is the data retransmission newspaper that payload generates.
Embodiment ten, a kind of data transmission system with reference to figure 7, comprise receiver 801 and transmitter 802:
In more embodiment of the present invention, described receiver 801 can have the structure of embodiment four or embodiment five; Described transmitter can have the structure of embodiment eight or embodiment nine.
In sum, because after receiving file repairing requiring message, only retransmit the segmentation at error byte place indicated in this request to receiver, rather than the data in the whole coded identification are all retransmitted, make like this to retransmit and reduce for the data volume of receiver, so embodiments of the invention can reduce the shared Internet resources of data re-transmission;
On the other hand, because when the header of the datagram that is received correctly comprises error byte in the payload, payload can be divided into a plurality of segmentations, and in file repairing requiring message, also carry the label information of error byte place segmentation, thereby only ask transmitter to retransmit the segmentation at error byte place, rather than ask the total data in the whole coded identification is retransmitted, so embodiments of the invention can reduce the data retransmission amount to the transmitting terminal request; Like this, transmitter only need retransmit the segmentation at error byte place indicated in this request to receiver, rather than whole coded identification all retransmitted, thereby make to retransmit and reduce for the data volume of receiver, thereby can reduce the shared Internet resources of data re-transmission.
More than method, data repeating method, transmitter, receiver and the data transmission system of the request retransmission data that the embodiment of the invention provided is described in detail, used specific case herein principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and thought thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as limitation of the present invention.
Claims (11)
1, a kind of method of request retransmission data is characterized in that, comprising:
Receive the datagram that transmitter sends, obtain the payload and the header of this datagram;
If include error byte in the payload of described datagram, and header is correct, then mark is carried out in the position of described error byte, from the header of this datagram, obtain the coded identification sign ESI of coded identification in this datagram and the source module numbering SBN of affiliated source module, and the payload of this datagram is divided at least two segmentations;
In described two segmentations, obtain the segmentation at error byte place at least according to the position of the error byte of mark;
Spanned file is repaired request message, carries label information and the described ESI and the SBN of described error byte place segmentation in the described message;
Send described file repairing requiring message to described transmitter.
2, the method for request retransmission data as claimed in claim 1 is characterized in that, described payload with this datagram is divided at least two segmentations and specifically comprises: the segmentation that the payload of this datagram is equally divided into predetermined number according to pre-configured chopping rule.
3, the method for request retransmission data as claimed in claim 1, it is characterized in that, described payload with this datagram is divided at least two segmentations and specifically comprises: according to the distribution situation of the error byte of mark the payload of this datagram is divided at least two segmentations, guarantees wherein not comprise error byte at least one segmentation.
4, as the method for each described request retransmission data of claim 1 to 3, it is characterized in that,
Describedly further comprise after transmitter sends file repairing requiring message: receive the data retransmission newspaper that described transmitter sends, it is payload that this data retransmission is responded with the data that segmentation markers information, ESI and SBN that described file repairing requiring message carries point to;
Further comprise behind the data retransmission newspaper that described reception transmitter sends: the data in this datagram are recombinated according to right-on segmentation in segmentation in the described data retransmission newspaper and the preceding respective datagram that once receives.
5, a kind of receiver is characterized in that, comprising:
Receiving element is used to receive the datagram that transmitter sends;
First processing unit is used for obtaining from described datagram the payload and the header of this datagram;
Judging unit be used for judging whether described payload comprises error byte, and whether header is correct, and the output judged result;
Second processing unit, being used in described judged result is under the situation that is, mark is carried out in the position of described error byte, obtains the ESI of coded identification in this datagram and the SBN of affiliated source module from described header, and described payload is divided at least two segmentations; And the segmentation of in described segmentation, obtaining the error byte place according to the position of the error byte of mark;
Message generation unit is used for spanned file and repairs request message, carries label information and the described ESI and the SBN of described error byte place segmentation in the described message;
Transmitting element is used for sending described file repairing requiring message to described transmitter.
6, receiver as claimed in claim 5 is characterized in that, described second processing unit specifically comprises:
Indexing unit, being used in described judged result is under the situation that is, mark is carried out in the position of described error byte;
The sign acquiring unit, being used in described judged result is under the situation that is, obtains the ESI of coded identification in this datagram and the SBN of affiliated source module from described header;
Segmenting unit, being used in described judged result is under the situation that is, according to pre-configured chopping rule described payload is divided at least two segmentations;
The segmentation acquiring unit is used for obtaining in described segmentation according to the position of the error byte of indexing unit mark the segmentation at error byte place.
7, receiver as claimed in claim 5 is characterized in that, described second processing unit specifically comprises:
Indexing unit, being used in described judged result is under the situation that is, mark is carried out in the position of described error byte;
The sign acquiring unit, being used in described judged result is under the situation that is, obtains the ESI of coded identification in this datagram and the SBN of affiliated source module from described header;
Segmenting unit, being used in described judged result is under the situation that is, according to the distribution situation of the error byte of mark described payload is divided at least two segmentations, guarantees wherein not comprise error byte at least one segmentation;
The segmentation acquiring unit is used for obtaining in described segmentation according to the position of the error byte of indexing unit mark the segmentation at error byte place.
8, as claim 5 or 6 or 7 described receivers, it is characterized in that,
The datagram that described receiving element receives comprises the data retransmission newspaper that described transmitter sends, and this datagram is payload with the segment data, and described segment data is indicated by the label information of described error byte place segmentation and described ESI and SBN;
Described receiver also comprises recovery unit, is used for according to right-on segmentation in the segmentation of described data retransmission newspaper and the preceding respective datagram that once receives the data in this datagram being recombinated.
9, a kind of data repeating method is characterized in that, comprising:
Reception is from the file repairing requiring message of receiver, carries the ESI of coded identification under the label information, this segmentation of error byte place segmentation in the datagram that receiver receives and the SBN of affiliated source module in the described message;
Obtain by the label information of described error byte place segmentation, described ESI and the indicated segment data of SBN;
Generation comprises the data retransmission newspaper of the segment data of described segmentation markers information points, described ESI and SBN;
Send described data retransmission newspaper to described receiver.
10, a kind of transmitter is characterized in that, comprising:
Receiving element is used to receive the file repairing requiring message from receiver, carries the ESI of coded identification under the label information, this segmentation of error byte place segmentation in the datagram that receiver receives and the SBN of affiliated source module in the described message;
The segment data acquiring unit is used to obtain by the label information of described error byte place segmentation, described ESI and the indicated segment data of SBN;
The datagram generation unit, the data retransmission that is used to generate the segment data, described ESI and the SBN that comprise described label information sensing is reported;
Transmitting element is used for sending to described receiver the datagram of described generation.
11, a kind of data transmission system is characterized in that, comprises transmitter and receiver; Wherein:
Described receiver is used to receive the datagram that described transmitter sends, from described datagram, obtain payload and header, in described payload, comprise error byte, and when header is correct, mark is carried out in position to described error byte, from described header, obtain the ESI of coded identification in this datagram and the SBN of affiliated source module, and described payload is divided at least two segmentations; And, in described a plurality of segmentations, obtain the segmentation at error byte place according to the position of the error byte of mark; Also be used for spanned file and repair request message, and send this message, carry label information and the described ESI and the SBN of described error byte place segmentation in the described message to described transmitter;
Described transmitter is used to receive described file repairing requiring message, obtains label information and described ESI and the indicated segment data of SBN by the error byte place segmentation in the described file repairing requiring message; And generate the data retransmission newspaper comprise segment data, described ESI and SBN that described label information points to, and send described data retransmission newspaper to described receiver.
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| CN 200710097228 CN101043296A (en) | 2007-04-28 | 2007-04-28 | Method for requesting retransmission data, data retransmitting method and data transmission system |
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| CN 200710097228 CN101043296A (en) | 2007-04-28 | 2007-04-28 | Method for requesting retransmission data, data retransmitting method and data transmission system |
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| CN101222508A (en) * | 2008-01-22 | 2008-07-16 | 张建中 | Method, device and system for data grouping error processing and controlling |
| CN101902315A (en) * | 2009-06-01 | 2010-12-01 | 华为技术有限公司 | Retransmission method, device and communication system based on forward error correction |
| CN102571264A (en) * | 2010-12-27 | 2012-07-11 | 中国移动通信集团公司 | Method and device for protecting integrity of file during broadcasting of data file |
| CN101621364B (en) * | 2008-06-30 | 2013-01-30 | 富士通株式会社 | Automatic retransmission controller and reconfiguration device of retransmission block |
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| CN102571264B (en) * | 2010-12-27 | 2015-03-11 | 中国移动通信集团公司 | Method and device for protecting integrity of file during broadcasting of data file |
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| US10659507B2 (en) | 2015-03-02 | 2020-05-19 | Qualcomm Incorporated | Indication for partial segment |
| CN107431700B (en) * | 2015-03-02 | 2021-03-09 | 高通股份有限公司 | Method and apparatus for indication of partial segments |
| CN107431700A (en) * | 2015-03-02 | 2017-12-01 | 高通股份有限公司 | Indication of partial segments |
| US10749930B2 (en) | 2015-03-02 | 2020-08-18 | Qualcomm Incorporated | Indication for partial segment |
| CN107409023A (en) * | 2015-03-17 | 2017-11-28 | 华为技术有限公司 | A kind of data merged in layer domain and the method and apparatus for retransmitting data |
| CN105743614B (en) * | 2016-04-01 | 2019-05-24 | 网宿科技股份有限公司 | The transmission method and device of data |
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