CN104579573A - Coding method, decoding method, sending end and receiving end for feedback information of data transmission - Google Patents
Coding method, decoding method, sending end and receiving end for feedback information of data transmission Download PDFInfo
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- CN104579573A CN104579573A CN201510026398.0A CN201510026398A CN104579573A CN 104579573 A CN104579573 A CN 104579573A CN 201510026398 A CN201510026398 A CN 201510026398A CN 104579573 A CN104579573 A CN 104579573A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/1607—Details of the supervisory signal
- H04L1/1671—Details of the supervisory signal the supervisory signal being transmitted together with control information
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
- H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
- H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]
- H04L1/1816—Hybrid protocols; Hybrid automatic repeat request [HARQ] with retransmission of the same, encoded, message
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Abstract
The invention relates to the technical field of communication, and particularly provides a coding method, decoding method, sending end and receiving end for feedback information of data transmission. The coding method comprises the steps that the receiving end receives data packages sent by the sending end, original bitmaps are generated according to numbers and receiving states of the data packages, and coding is conducted on the original bitmaps to generate first compressed bitmaps; the feedback information is sent to the sending end, wherein the feedback information comprises short original bitmaps or the first compressed bitmaps and further comprises compressing mode describing information and initial state marks. The decoding method comprises the steps that the sending end decodes to generate the original bitmaps according to the compressing mode describing information; data packages lost by the receiving end are resent according to the original bitmaps or the original bitmaps obtained after decoding. The receiving end comprises a data package receiving unit, an original bitmap generating unit, an original bitmap coding unit and a feedback information sending unit; the sending end comprises a feedback information receiving unit, a compressed bitmap decoding unit and a data package sending unit.
Description
Technical field
The present invention relates to communication technical field, specifically, relate to a kind of coding of feedback information of transfer of data, coding/decoding method and transmitting terminal and receiving terminal.
Background technology
Transfer of data refers to according to suitable code, through one or more link, transmits the process of data between data source and data sink.How correctly transmitting data is very important problems.In order to solve this difficult problem, usually adopting and guaranteeing that receiving terminal can correctly receive all packets with the protocol procedures of feedback mechanism.At present in synchronous satellite mobile communication system, long delay and cause transfer of data unreliable compared with high bit-error, the existing RLC at protocol stack (Radio Link Control, wireless spread-spectrum technology) layer adopts the mode of AM (affirmation mode) to transmit the reliability that data can increase data maturation.Receiving terminal sends feedback information to transmitting terminal, and transmitting terminal resends the packet of loss according to feedback information.Feedback information comprises bitmap, in order to reduce the resource shared by feedback information, generally ITU-T Recommendation compression method coding is T.4 used to bitmap, but the compression gains of this coding method is lower, and the coding/decoding method of correspondence is more loaded down with trivial details, add the load of transmitting terminal, reduce the data transmission efficiency of synchronous satellite mobile communication system.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of coding of feedback information of transfer of data, coding/decoding method and transmitting terminal and receiving terminal, the compression gains of feedback information Bitmap can be improved, simplify decode procedure, improve the data transmission efficiency of synchronous satellite mobile communication system.
The present invention is achieved in that
First aspect, embodiments provides a kind of coding method of feedback information of transfer of data, is applied to the device of transfer of data, and the device of described transfer of data comprises transmitting terminal and receiving terminal, and described feedback information comprises bitmap; The packet that described transmitting terminal sends comprises the numbering of packet, and described method comprises:
Described receiving terminal receives the packet that described transmitting terminal sends, and the accepting state according to described numbering and described packet generates original bitmap, and the length of described original bitmap is LS, LS≤511;
Described receiving terminal is encoded to described original bitmap, generates the first compress bitmap, and the length of described first compress bitmap is LC1; Described first compress bitmap comprises the first code word of multiple fixed length, and the first code word of each fixed length represents figure place that is identical in described original bitmap and continuous print binary number;
The feedback information comprising described bitmap is sent to described transmitting terminal by described receiving terminal; If LS≤LC1, then select described original bitmap to be the bitmap that described feedback information comprises, if described LC1 ﹤ LS, then select described first compress bitmap to be the bitmap that described feedback information comprises; Described feedback information also comprises the compress mode descriptor that the described bitmap of description is described original bitmap or described first compress bitmap; If described bitmap is described first compress bitmap, described feedback information also comprises the identical and initial state mark of the accepting state of packet representated by continuous print binary number of first paragraph in the original bitmap described in described first compress bitmap corresponding to first the first code word.
In conjunction with first aspect, embodiments provide the first possible execution mode of first aspect, the first code word of wherein said each fixed length represents figure place that is identical in described original bitmap and continuous print binary number, comprising:
If the described identical and figure place of continuous print binary number is not more than 63, then this Duan Wei is more than the figure place of the binary number of 63 by 6 binary code representations, and described 6 binary codes are result code; If the described identical and figure place of continuous print binary number is more than 63, then this section is more than the figure place of the binary number of 63 by 9 binary code representations, and 3 high positions of described 9 binary codes are generated code, and 6 low levels are result code; Described first code word comprises described result code or described generated code and described result code, and first of described first code word is type codes, and described type codes describes described first code word and comprises or do not comprise described generated code.
First code word of fixed length is 7 or 10, when decoding, read type codes and just know that the first code word of this section of fixed length is 7 or 10, read type codes 6 immediately below or 9 just can decode, make decode procedure simple and quick, improve the efficiency of decoding, and then improve the efficiency of transfer of data.
In conjunction with first aspect or the first the possible execution mode in conjunction with first aspect, embodiments provide the execution mode that the second of first aspect is possible, wherein said first compress bitmap comprises the first code word of multiple fixed length, comprising:
Described first compress bitmap comprises described multiple described first code word combined in order, and described order is corresponding described identical of described first code word and the order of continuous print binary number in described original bitmap.
First code word is combined into the first compress bitmap in order, and the original bitmap decoded could the correct accepting state reflecting packet.
In conjunction with the execution mode that the second of first aspect is possible, embodiments provide the third possible execution mode of first aspect, the wherein said accepting state according to described packet generates original bitmap, comprising:
The accepting state of the packet of described original bitmap corresponding to the next one numbering of the numbering of first packet lost generates.
Just generate original bitmap when there is data-bag lost, the packet before the packet of loss is defaulted as and successfully receives by transmitting terminal.The accepting state of the rear a data bag of the packet of the first bit representation first loss of original bitmap.First transmitting terminal retransmits packet corresponding to before first of original bitmap one.
In conjunction with the third possible execution mode of first aspect, embodiments provide the 4th kind of possible execution mode of first aspect, wherein said method also comprises:
Described original bitmap comprised identical of described receiving terminal and the figure place of continuous print binary number are encoded according to ITU-T Recommendation compression method T.4, and every section identical and generate the second code word after the digit code of continuous print binary number;
Described second code word is according to described every section of identical and continuous print binary number sequential combination in described original bitmap, and generate the second compress bitmap, the length of described second compress bitmap is LC2;
The relatively size of LS, LC1 and LC2, if LS≤LC1 and LS≤LC2, described original bitmap is then selected to be the described bitmap that described feedback information comprises, if LC1≤LC2 and LC1 ﹤ LS, described first bitmap is then selected to be the described bitmap that described feedback information comprises, if described LC2 ﹤ LS and LC2 ﹤ LC1, then described second bitmap is selected to be the described bitmap that described feedback information comprises; Described feedback information also comprises the compress mode descriptor that the described bitmap of description is described original bitmap, described first compress bitmap or described second compress bitmap.
After receiving terminal generates original bitmap, original bitmap is carried out to the coding of two kinds of modes, then compare the length of the compress bitmap that two kinds of coded systems generate respectively and the length of original bitmap, send the bitmap that length is shorter, if bitmap is equally long, then send the original bitmap not needing to decode.
In conjunction with the 4th kind of possible execution mode of the first possible execution mode of first aspect, first aspect, the third possible execution mode of first aspect or first aspect, embodiments provide the 5th kind of possible execution mode of first aspect, what in wherein said original bitmap, binary number 0 represented that the lost data packets that the accepting state of packet comprises, binary number 1 represent that the accepting state of packet comprises receives packet; In original bitmap in described first compress bitmap corresponding to first the first code word, first paragraph is identical and the initial state mark of the accepting state of packet representated by continuous print binary number comprises binary number 0 and 1, wherein initial state marks the binary number 0 comprised and represents that first paragraph is identical and continuous print binary number is 0, and initial state marks the binary number 1 comprised and represents that first paragraph is identical and continuous print binary number is 1.
Due in the first compress bitmap, identical and continuous print binary number 0 or 1, when length is identical, the first code word is identical, so the identical and initial state of the accepting state of packet representated by continuous print binary number of first paragraph in feedback information needs to comprise in the first compress bitmap corresponding to first the first code word original bitmap.Two adjacent the first code words represent that two sections identical and continuous print binary number 0 is identical with 1 or two sections and continuous print binary number 1 and 0.
Second aspect, the embodiment of the present invention additionally provides a kind of coding/decoding method of feedback information of transfer of data, is applied to the device of transfer of data, and the device of described transfer of data comprises transmitting terminal and receiving terminal, and described feedback information comprises bitmap, and described method comprises:
Described transmitting terminal receives the described feedback information that described receiving terminal sends, and described feedback information also comprises the compress mode descriptor that the described bitmap of description is described original bitmap, the first compress bitmap or the second compress bitmap;
If the bitmap that described feedback information comprises is described first compress bitmap or described second compress bitmap, described transmitting terminal to be decoded the bitmap that described feedback information comprises according to described compress mode descriptor, generates original bitmap;
The accepting state of the packet represented by original bitmap obtained after the original bitmap that described transmitting terminal comprises according to described feedback information or decoding, resends the packet that described receiving terminal is lost.
In conjunction with second aspect, embodiments provide the first possible execution mode of second aspect, if the bitmap that wherein described feedback information comprises is described first compress bitmap, described feedback information also comprises the identical and initial state mark of the accepting state of packet representated by continuous print binary number of first paragraph in the original bitmap described in described first compress bitmap corresponding to first the first code word; Described transmitting terminal to be decoded the bitmap that described feedback information comprises according to described compress mode descriptor, generates original bitmap, comprising:
According to described compress mode descriptor, described transmitting terminal judges that the described bitmap that described feedback information comprises is described first compress bitmap or described second compress bitmap;
Described first compress bitmap comprises the first code word of multiple fixed length, and each first code word comprises result code or generated code and result code, and described result code is 6 binary codes, and described generated code is 3 binary codes; First of described first code word is type codes, and described type codes describes described first code word and comprises or do not comprise described generated code; If the described bitmap that described feedback information comprises is described first compress bitmap, described transmitting terminal determines the length of each first code word according to described type codes, again according to length and described first compress bitmap of described initial state mark decoding of each first code word, generate original bitmap;
If the described bitmap that described feedback information comprises is described second compress bitmap, described transmitting terminal is encoded to described second compress bitmap according to ITU-T Recommendation coding/decoding method T.4, and generates original bitmap according to described initial state mark.
If according to compress mode descriptor, transmitting terminal judges that the bitmap that feedback information comprises is the first compress bitmap or the second compress bitmap, transmitting terminal is just decoded to it according to different coding/decoding methods, generates original bitmap.
The third aspect, embodiments provide a kind of receiving terminal of transfer of data, be applied to the device of transfer of data, the device of described transfer of data comprises transmitting terminal and receiving terminal, described transmitting terminal sends packet to described receiving terminal, described receiving terminal sends the feedback information of the accepting state of data of description bag to described transmitting terminal, and described feedback information comprises bitmap; The packet that described transmitting terminal sends comprises the numbering of packet, and described receiving terminal comprises:
Receives data packets unit, for receiving the packet that described transmitting terminal sends;
Original bitmap generation unit, generate original bitmap for the accepting state according to described numbering and described packet, the length of described original bitmap is LS, LS≤511;
Original bitmap coding unit, for encoding to described original bitmap, generate compress bitmap, the length of described compress bitmap is LC; Described compress bitmap comprises the code word of multiple fixed length, and the code word of each fixed length represents figure place that is identical in described original bitmap and continuous print binary number;
Feedback information transmitting element, for being sent to transmitting terminal by the feedback information comprising described bitmap; If LS≤LC, then select described original bitmap to be the bitmap that described feedback information comprises, if described LC ﹤ LS, then select described compress bitmap to be the bitmap that described feedback information comprises; Described feedback information also comprises the compress mode descriptor that the described bitmap of description is described original bitmap or described compress bitmap; If described bitmap is described compress bitmap, described feedback information also comprises and describes the identical and initial state mark of the accepting state of packet representated by continuous print binary number of first paragraph in described compress bitmap.
Fourth aspect, embodiments provide a kind of transmitting terminal of transfer of data, be applied to the device of transfer of data, the device of described transfer of data comprises transmitting terminal and receiving terminal, described transmitting terminal sends packet to described receiving terminal, described receiving terminal sends the feedback information of the accepting state of data of description bag to described transmitting terminal, and described feedback information comprises bitmap; The packet that described transmitting terminal sends comprises the numbering of packet, and described transmitting terminal comprises:
Feedback information receiving element, for receiving the described feedback information that described receiving terminal sends, described feedback information also comprises the compress mode descriptor that the described bitmap of description is original bitmap or compress bitmap;
Compress bitmap decoding unit, if the bitmap comprised for described feedback information is described compress bitmap, decodes the bitmap that described feedback information comprises according to described compress mode descriptor, generates original bitmap;
Packet Generation unit, for the accepting state of the packet represented by the original bitmap comprised according to described feedback information or the original bitmap obtained after decoding, resends the packet that described receiving terminal is lost.
The technique effect that the present invention realizes: the invention provides a kind of coding of feedback information of transfer of data, coding/decoding method and transmitting terminal and receiving terminal, encoded by the original bitmap generated the accepting state of packet, send the shorter original bitmap of length or compress bitmap again, make the feedback information of transfer of data lack busy channel resource as far as possible.The coding method of the feedback information of a kind of transfer of data provided by the invention comprises a kind of method using the code word of fixed length to encode to original bitmap, the method compression gains is large, the channel resource taken during transmission is few, and coding/decoding method is simple, improves the efficiency of transfer of data.
For making above-mentioned purpose of the present invention, feature and advantage become apparent, preferred embodiment cited below particularly, and coordinate appended accompanying drawing, be described in detail below.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, be briefly described to the accompanying drawing used required in embodiment below, be to be understood that, the following drawings illustrate only some embodiment of the present invention, therefore the restriction to scope should be counted as, for those of ordinary skill in the art, under the prerequisite not paying creative work, other relevant accompanying drawings can also be obtained according to these accompanying drawings.
Fig. 1 shows the flow process of the coding method of the feedback information of a kind of transfer of data that the embodiment of the present invention provides;
Fig. 2 shows the flow process of the coding method of the feedback information of the another kind of transfer of data that the embodiment of the present invention provides;
Fig. 3 shows the flow process of the coding/decoding method of the feedback information of a kind of transfer of data that the embodiment of the present invention provides;
Fig. 4 shows a kind of transmitting terminal of transfer of data and the structure of receiving terminal that the embodiment of the present invention provides;
Fig. 5 a shows the result code code table of the first code word that the embodiment of the present invention provides;
Fig. 5 b shows the generated code code table of the first code word that the embodiment of the present invention provides;
Fig. 6 a shows the result code code table of the second code word that the embodiment of the present invention provides;
Fig. 6 b shows the generated code code table of the second code word that the embodiment of the present invention provides.
Fig. 7 shows the structure not comprising the first code word of generated code that the embodiment of the present invention provides;
Fig. 8 shows the structure comprising the first code word of generated code that the embodiment of the present invention provides.
Mark in figure: receiving terminal 401, receives data packets unit 402, original bitmap generation unit 403, original bitmap coding unit 404, feedback information transmitting element 405, transmitting terminal 501, Packet Generation unit 502, compress bitmap decoding unit 503, feedback information receiving element 504.
Embodiment
Below in conjunction with accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.The assembly of the embodiment of the present invention describing and illustrate in usual accompanying drawing herein can be arranged with various different configuration and design.Therefore, below to the detailed description of the embodiments of the invention provided in the accompanying drawings and the claimed scope of the present invention of not intended to be limiting, but selected embodiment of the present invention is only represented.Based on embodiments of the invention, the every other embodiment that those skilled in the art obtain under the prerequisite not making creative work, all belongs to the scope of protection of the invention.
In synchronous satellite mobile communication system, long delay and cause the unreliability of transfer of data greatly to increase compared with high bit-error.For increasing data transmission credibility, the mode of AM (affirmation mode) is adopted to transmit data at the wireless chain control layer of protocol stack.Its operational mode is such: numbering, by outgoing data packet number, is included in data head during transmission by transmitting terminal; Receiving terminal receives packet successively, and record has received the numbering of packet; Receiving terminal sends ACK/NACK (confirmation/non-acknowledgement) message to transmitting terminal, and which packet notice transmitting terminal receives, and which packet is not received; Transmitting terminal retransmits the unreceived data of receiving terminal according to the content of ACK/NACK.
ACK/NACK message generally comprises the confirmation to multiple packet.Its method for expressing is bitmap.Each of bitmap represents the state of a packet.The bitmap of an ACK/NACK message can confirm at most the state of 511 packets, and namely the bitmap of an ACK/NACK may use 511 bits (1 bit is exactly 1 bit) to represent.But not every burst length can meet this demand, and an ACK/NACK message can not send in multiple burst in segmentation.Therefore a kind of compress mode of employing reduces the length shared by ACK/NACK message Bitmap usually.The coded system that the fax that this compression method uses ITU-TRecommendation T.4 described uses.The specific code word of this method represents multiple continuous print 1 and multiple continuous print 0, and does the reason that can realize compression gains like this and be: the pattern of fax uses pixel to represent, each pixel only has " black " and " in vain " two values, correspondence " 0 " and " 1 ".Because the granularity of pixel is tiny, so pattern is made up of continuous print 0 and continuous print 1 substantially.When use certain code word representative continuously multiple 1 and 0 time, the bit length shared by code word is less than expressed multiple continuous print 1 and the length of multiple continuous print 0.
But the code word that this coding method produces is still longer, and the decode procedure of its correspondence is more complicated.Because code word is not fixed length, when therefore identifying each code word in a string bit stream, need the parsing carrying out bit-by-bit from the beginning to the end, a complete code word could be determined.
The embodiment of the present invention provides a kind of coding method of feedback information of transfer of data, and the code word that the method coding produces is shorter, improves compression gains.
Consult Fig. 1, a kind of coding method of feedback information of transfer of data, be applied to the device of transfer of data, the device of transfer of data comprises transmitting terminal and receiving terminal, and feedback information comprises bitmap; The packet that transmitting terminal sends comprises the numbering of packet, and method comprises:
S101: the packet that receiving terminal receiving end/sending end sends.
S102: receiving terminal generates original bitmap according to the accepting state of numbering and packet, and the length of original bitmap is LS, LS≤511.
S103: receiving terminal is encoded to original bitmap, generates the first compress bitmap, and the length of the first compress bitmap is LC1; First compress bitmap comprises the first code word of multiple fixed length, and the first code word of each fixed length represents figure place that is identical in original bitmap and continuous print binary number.
S104: receiving terminal compares the length of LS and LC1.
S105: the feedback information comprising bitmap is sent to transmitting terminal by receiving terminal;
If LS≤LC1, then select original bitmap to be the bitmap that feedback information comprises, if LC1 ﹤ is LS, then select the first compress bitmap to be the bitmap that feedback information comprises; Feedback information also comprises the compress mode descriptor that description bitmap is original bitmap or the first compress bitmap; If bitmap is the first compress bitmap, feedback information also comprises the identical and initial state mark of the accepting state of packet representated by continuous print binary number of first paragraph in the original bitmap in description first compress bitmap corresponding to first the first code word.
The coding method of the feedback information of this transfer of data adopts the first codeword coding of fixed length, the first code word reading fixed length is only needed when decoding, and do not need the parsing from the beginning to the end code word being carried out to bit-by-bit, make decoding simple, improve the efficiency of transmission of data.
Consult Fig. 2, a kind of coding method of feedback information of transfer of data, be applied to the device of transfer of data, the device of transfer of data comprises transmitting terminal and receiving terminal, and feedback information comprises bitmap; The packet that transmitting terminal sends comprises the numbering of packet, and method comprises:
S201: the packet that receiving terminal receiving end/sending end sends.
S202: receiving terminal generates original bitmap according to the accepting state of numbering and packet, and the length of original bitmap is LS, LS≤511.
S203: receiving terminal is encoded to original bitmap, generates the first compress bitmap and the second compress bitmap, and the length of the first compress bitmap is LC1, and the length of the second compress bitmap is LC2;
The step generating the first compress bitmap is as follows:
First compress bitmap comprises the first code word of multiple fixed length, first code word of multiple fixed length combines in order, the order of combination is corresponding identical of the first code word and the order of continuous print binary number in original bitmap, and the first code word of each fixed length represents figure place that is identical in original bitmap and continuous print binary number.If the identical and figure place of continuous print binary number is not more than 63, as Fig. 7, then this Duan Wei is more than the figure place of the binary number of 63 by 6 binary code representations, and 6 binary codes are result code; If the identical and figure place of continuous print binary number is more than 63, as Fig. 8, then this section is more than the figure place of the binary number of 63 by 9 binary code representations, and 3 high positions of 9 binary codes are generated code, and 6 low levels are result code; First code word comprises result code or generated code and result code, and first of the first code word is type codes, and type codes describes the first code word and comprises or do not comprise generated code;
The step generating the second compress bitmap is as follows:
Original bitmap comprised identical of receiving terminal and the figure place of continuous print binary number are encoded according to ITU-T Recommendation compression method T.4, and every section identical and generate the second code word after the digit code of continuous print binary number; Second code word is the identical and sequential combination of continuous print binary number in original bitmap according to every section, generates the second compress bitmap.
S204: receiving terminal compares the size of LS, LC1 and LC2;
If LS≤LC1 and LS≤LC2, then select original bitmap to be the bitmap that feedback information comprises, if LC1≤LC2 and LC1 ﹤ LS, then select the first bitmap to be the bitmap that feedback information comprises, if LC2 ﹤ LS and LC2 ﹤ LC1, then the second bitmap is selected to be the bitmap that feedback information comprises; Feedback information also comprises the compress mode descriptor that description bitmap is original bitmap, the first compress bitmap or the second compress bitmap; If bitmap is the first compress bitmap, feedback information also comprises the identical and initial state mark of the accepting state of packet representated by continuous print binary number of first paragraph in the original bitmap in description first compress bitmap corresponding to first the first code word.
S205: the feedback information comprising bitmap is sent to transmitting terminal by receiving terminal, the bitmap that the feedback information of transmission comprises may be original bitmap, the first compress bitmap or the second compress bitmap.
In order to improve the efficiency of transfer of data, when generating original bitmap, the accepting state of the packet corresponding to the next one numbering of the numbering of first packet lost generates.The data-bag lost of such as numbering x, so original bitmap the first bit representation be the accepting state of the packet of numbering x+1, the accepting state of what second represented the is packet of numbering x+2.Numbering x-1 and the packet of numbering before are defaulted as and successfully receive.
In the embodiment of the present invention, in original bitmap, binary number 0 represents data-bag lost, and binary number 1 represents that receives data packets arrives.In original bitmap in first compress bitmap corresponding to first the first code word, first paragraph is identical and the initial state mark of the accepting state of packet representated by continuous print binary number comprises binary number 0 and 1, wherein initial state marks the binary number 0 comprised and represents that first paragraph is identical and continuous print binary number is 0, and initial state marks the binary number 1 comprised and represents that first paragraph is identical and continuous print binary number is 1.Also according to the demand of reality, the binary number 0 and 1 in original bitmap, initial state can be marked to the binary number 0 and 1 comprised and give the content contrary with above-mentioned expression content.
Corresponding above-mentioned coding method, consult Fig. 3, the embodiment of the present invention provides a kind of coding/decoding method of feedback information of transfer of data, is applied to the device of transfer of data, and the device of transfer of data comprises transmitting terminal and receiving terminal, and feedback information comprises bitmap, and method comprises:
S301: transmitting terminal receives the feedback information that receiving terminal sends;
Feedback information also comprises the compress mode descriptor that description bitmap is original bitmap, the first compress bitmap or the second compress bitmap.
S302: if the bitmap that feedback information comprises is the first compress bitmap or the second compress bitmap, according to compress mode descriptor, transmitting terminal judges that the bitmap that feedback information comprises is the first compress bitmap or the second compress bitmap, then the bitmap that comprises of decoding feedback information, generates original bitmap;
Concrete steps are as follows: if the bitmap that feedback information comprises is the first compress bitmap, feedback information also comprises the identical and initial state mark of the accepting state of packet representated by continuous print binary number of first paragraph in the original bitmap in description first compress bitmap corresponding to first the first code word, transmitting terminal first reads initial state mark, determine be first of the original bitmap packet described to be lose or receive described by first the first code word, then first that reads first the first code word, i.e. type codes, determine that the length of first the first code word is 7 or 10, then decoding first the first code word, and then decoding second the first code word, until generation original bitmap,
If the bitmap that feedback information comprises is the second compress bitmap, then the decoding method decodes that transmitting terminal is corresponding according to ITU-TRecommendation compression method T.4, generates original bitmap.
S303: the accepting state of the packet represented by original bitmap obtained after the original bitmap that transmitting terminal comprises according to feedback information or decoding, resends the packet that receiving terminal is lost.
When using above-mentioned Code And Decode method, the packet that the first receiving end/sending end of receiving terminal sends, packet comprises the numbering of packet.Receiving terminal generates original bitmap according to the accepting state of packet and numbering, and original bitmap is made up of binary number 0 and 1, and 0 represents data-bag lost, and 1 represents receives data packets success, and in original bitmap, the figure place of binary number is the length LS of original bitmap.After generating original bitmap, receiving terminal carries out compression coding to original bitmap, and mode has two kinds, and generate the first compress bitmap and the second compress bitmap, length is respectively LC1 and LC2.The generating mode of the first compress bitmap is as follows:
Such as, such one section of binary number is had in original bitmap ... 111111111100000 ... so according to code table and Fig. 7 and Fig. 8 of the first code word shown in Fig. 5 a and Fig. 5 b, the first compress bitmap generated is ... 00010100000100 ... because this section of continuous and identical binary number 0 and 1 in original bitmap is not more than 63, so do not use generated code, two section of first code word of generation is 7.
The generating mode of the second compress bitmap is as follows:
If still there is such one section of binary number in original bitmap ... 111111111100000 ..., the second compress bitmap so generated according to the code table of the second code word shown in Fig. 6 a and Fig. 6 b is ... 001110011 ...
As can be seen from the table, when length that is identical in original bitmap and continuous print binary number is less than 18, the gain of the second compress bitmap is higher than the gain of the first compress bitmap, but when identical and length that is continuous print binary number is more than or equal to 18 in original bitmap, when being particularly greater than 63, each first code word remains on 10, and represents that the length of the second code word of continuous print binary number 0 is nearly all more than 20.In synchronous satellite mobile communication, the transmission of data can be subject to a lot of interference, so multidigit continuous print binary number 0 can often occur, so the coded system generating the first compress bitmap in synchronous satellite mobile communication is better than the coded system of existing generation second compress bitmap in original bitmap.In order to tackle the multiple situation that may occur, the feedback information of the transfer of data that the embodiment of the present invention provides uses above two kinds of methods coding, compares the length of the compress bitmap of generation, sends the compress bitmap that length is shorter.
In the above example, if with 111111111100000 for original bitmap, so the length LC2 of the second compress bitmap 001110011 is shorter than the length LC1 of the first compress bitmap 00010100000100 and the length of original bitmap LS, and the bitmap that namely feedback information sends is the second compress bitmap.The second compress bitmap now takies less channel resource.
Receiving terminal sends and feeds back to transmitting terminal, and feedback information also comprises compress mode descriptor and initial state mark.After transmitting terminal receives feedback information, judge that the bitmap that feedback information comprises is original bitmap, the first compress bitmap or the second compress bitmap according to compress mode descriptor; Learn that first code word of compress bitmap represents 1 according to initial state mark.Example in continuation, bitmap is the second compress bitmap, and transmitting terminal is decoded to it according to Fig. 6 a and 6b.Decode procedure is as follows:
Due to cannot judged result code or generated code, so need progressively to determine.
When resolving first the second code word,
(1) read first, because this value is 0, then can conclude:
If result code: first the second code word may in [1,2,10,11,12,13,18...63] this set value;
If generated code: first the second code word may be [192,256,320,384,448].
(2) read second, because this value is 0, then can conclude:
If result code: first the second code word may in [1,10,12,13,19...23,26,28...48,53,54,61,62,63] this set value;
If generated code: first the second code word may be [320,384].
(3) read the 3rd, because this value is 1, then can conclude:
If result code: first code word may in [10,12,21,26,28,39...44,53,54,61,62,63] this set value;
If generated code: first code word may be [320,384].
(4) read the 4th, because this value is 1, then can conclude:
If result code: first code word may in [10,28,61,62,63] this set value;
If generated code: first code word may be [320,384].
(5) read the 5th, because this value is 1, then can conclude:
First code word represents 10 continuous print binary numbers 1.
When resolving second the second code word, due to first second code word table show what be that continuous and identical binary number 1, second second code word table show is continuous and identical binary number 0.
(6) read the 6th, because this value is 0, then can conclude:
Second the second code word is result code: may [3...63] this set in value.
(7) read the 7th, because this value is 0, then can conclude:
Second the second code word is result code: may [5...63] this set in value.
(8) read the 8th, because this value is 1, then can conclude:
Second the second code word is result code: may [5,6] this set in value.
(9) read the 9th, because this value is 1, then can conclude:
Second second code word table shows 5 continuous print binary numbers 0.
Can find out that the decode procedure of the second compress bitmap is complicated according to decode procedure.Under normal circumstances, because volume of transmitted data is large, the quantity of packet is more, so original bitmap is longer, at this moment the gain of the first compress bitmap is greater than the gain of the second compress bitmap, and coding/decoding method is simple, and the bitmap that feedback information comprises is exactly generally the first compress bitmap.
If the bitmap that feedback information comprises is the first compress bitmap, decode 00010100000100 time, transmitting terminal is decoded according to Fig. 5 a and Fig. 5 b.According to code word before, transmitting terminal learns that this section first the first code word represents continuous print binary number 1.
When resolving first the first code word,
(1) read first, because this value is 0, then can conclude: first code word is result code.
(2) read the value of the 2 to the 7, table look-up and learn that first the first code word represents 10 continuous print binary numbers 1.
When resolving second the first code word, because first the first code word represents continuous print binary number 1, so second the first code word represents continuous print binary number 0.
(3) read the value of the 8th, because this value is 0, then can conclude: second code word is result code.
(4) read the value of the 9 to the 14, table look-up and learn that second the first code word represents 5 continuous print binary numbers 0.
The coding/decoding method of the coding/decoding method of the first compress bitmap due to the second compress bitmap can be found out from the decode procedure of above-mentioned first compress bitmap.
The bitmap comprised when the feedback information separating extrusion original bitmap or reception is exactly original bitmap, the accepting state of the packet of transmitting terminal represented by original bitmap, resends the packet that receiving terminal is lost.
Consult Fig. 4, a kind of receiving terminal 401 of transfer of data, be applied to the device of transfer of data, the device of transfer of data comprises transmitting terminal 501 and receiving terminal 401, transmitting terminal 501 sends packet to receiving terminal 401, receiving terminal 401 sends the feedback information of the accepting state of data of description bag to transmitting terminal, and feedback information comprises bitmap; The packet that transmitting terminal 501 sends comprises the numbering of packet.Receiving terminal 401 comprises receives data packets unit 402, original bitmap generation unit 403, original bitmap coding unit 404 and feedback information transmitting element 405.Wherein,
The packet that receives data packets unit 402 sends for receiving end/sending end 501.
Original bitmap generation unit 403 generates original bitmap for the accepting state according to numbering and packet, and the length of original bitmap is LS, LS≤511.
Original bitmap coding unit 404 is for encoding to original bitmap, and generate compress bitmap, the length of compress bitmap is LC; Compress bitmap comprises the code word of multiple fixed length, and the code word of each fixed length represents figure place that is identical in original bitmap and continuous print binary number;
Feedback information transmitting element 405 is for being sent to transmitting terminal 501 by the feedback information comprising bitmap; If LS≤LC, then select original bitmap to be the bitmap that feedback information comprises, if LC ﹤ is LS, then select compress bitmap to be the bitmap that feedback information comprises; Feedback information also comprises the compress mode descriptor that description bitmap is original bitmap or compress bitmap; If bitmap is compress bitmap, feedback information also comprises and describes the identical and initial state mark of the accepting state of packet representated by continuous print binary number of first paragraph in compress bitmap.
Consult Fig. 4, corresponding with the function of receiving terminal 401, transmitting terminal 501 comprises feedback information receiving element 504, compress bitmap decoding unit 503 and Packet Generation unit 502.Wherein,
The feedback information that feedback information receiving element 504 sends for receiving feedback information transmitting element 405, feedback information also comprises the compress mode descriptor that description bitmap is original bitmap or compress bitmap.
If compress bitmap decoding unit 503 is compress bitmap for the bitmap that feedback information comprises, according to the bitmap that compress mode descriptor decoding feedback information comprises, generate original bitmap.
Packet Generation unit 502, for the accepting state of the packet represented by the original bitmap comprised according to feedback information or the original bitmap obtained after decoding, resends the packet that receiving terminal 401 is lost.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a coding method for the feedback information of transfer of data, is characterized in that, is applied to the device of transfer of data, and the device of described transfer of data comprises transmitting terminal and receiving terminal, and described feedback information comprises bitmap; The packet that described transmitting terminal sends comprises the numbering of packet, and described method comprises:
Described receiving terminal receives the packet that described transmitting terminal sends, and the accepting state according to described numbering and described packet generates original bitmap, and the length of described original bitmap is LS, LS≤511;
Described receiving terminal is encoded to described original bitmap, generates the first compress bitmap, and the length of described first compress bitmap is LC1; Described first compress bitmap comprises the first code word of multiple fixed length, and the first code word of each fixed length represents figure place that is identical in described original bitmap and continuous print binary number;
The feedback information comprising described bitmap is sent to described transmitting terminal by described receiving terminal; If LS≤LC1, then select described original bitmap to be the bitmap that described feedback information comprises, if described LC1 ﹤ LS, then select described first compress bitmap to be the bitmap that described feedback information comprises; Described feedback information also comprises the compress mode descriptor that the described bitmap of description is described original bitmap or described first compress bitmap; If described bitmap is described first compress bitmap, described feedback information also comprises the identical and initial state mark of the accepting state of packet representated by continuous print binary number of first paragraph in the original bitmap described in described first compress bitmap corresponding to first the first code word.
2. the coding method of the feedback information of transfer of data according to claim 1, is characterized in that, the first code word of described each fixed length represents figure place that is identical in described original bitmap and continuous print binary number, comprising:
If the described identical and figure place of continuous print binary number is not more than 63, then this Duan Wei is more than the figure place of the binary number of 63 by 6 binary code representations, and described 6 binary codes are result code; If the described identical and figure place of continuous print binary number is more than 63, then this section is more than the figure place of the binary number of 63 by 9 binary code representations, and 3 high positions of described 9 binary codes are generated code, and 6 low levels are result code; Described first code word comprises described result code or described generated code and described result code, and first of described first code word is type codes, and described type codes describes described first code word and comprises or do not comprise described generated code.
3. the coding method of the feedback information of transfer of data according to claim 1 and 2, is characterized in that, described first compress bitmap comprises the first code word of multiple fixed length, comprising:
Described first compress bitmap comprises described multiple described first code word combined in order, and described order is corresponding described identical of described first code word and the order of continuous print binary number in described original bitmap.
4. the coding method of the feedback information of transfer of data according to claim 3, is characterized in that, the described accepting state according to described packet generates original bitmap, comprising:
The accepting state of the packet of described original bitmap corresponding to the next one numbering of the numbering of first packet lost generates.
5. the coding method of the feedback information of transfer of data according to claim 4, is characterized in that, described method also comprises:
Described original bitmap comprised identical of described receiving terminal and the figure place of continuous print binary number are encoded according to ITU-T Recommendation compression method T.4, and every section identical and generate the second code word after the digit code of continuous print binary number;
Described second code word is according to described every section of identical and continuous print binary number sequential combination in described original bitmap, and generate the second compress bitmap, the length of described second compress bitmap is LC2;
The relatively size of LS, LC1 and LC2, if LS≤LC1 and LS≤LC2, described original bitmap is then selected to be the described bitmap that described feedback information comprises, if LC1≤LC2 and LC1 ﹤ LS, described first bitmap is then selected to be the described bitmap that described feedback information comprises, if described LC2 ﹤ LS and LC2 ﹤ LC1, then described second bitmap is selected to be the described bitmap that described feedback information comprises; Described feedback information also comprises the compress mode descriptor that the described bitmap of description is described original bitmap, described first compress bitmap or described second compress bitmap.
6. the coding method of the feedback information of the transfer of data according to claim 1,2,4 or 5, it is characterized in that, what in described original bitmap, binary number 0 represented that the lost data packets that the accepting state of packet comprises, binary number 1 represent that the accepting state of packet comprises receives packet; In original bitmap in described first compress bitmap corresponding to first the first code word, first paragraph is identical and the initial state mark of the accepting state of packet representated by continuous print binary number comprises binary number 0 and 1, wherein initial state marks the binary number 0 comprised and represents that first paragraph is identical and continuous print binary number is 0, and initial state marks the binary number 1 comprised and represents that first paragraph is identical and continuous print binary number is 1.
7. a coding/decoding method for the feedback information of transfer of data, is characterized in that, is applied to the device of transfer of data, and the device of described transfer of data comprises transmitting terminal and receiving terminal, and described feedback information comprises bitmap, and described method comprises:
Described transmitting terminal receives the described feedback information that described receiving terminal sends, and described feedback information also comprises the compress mode descriptor that the described bitmap of description is described original bitmap, the first compress bitmap or the second compress bitmap;
If the bitmap that described feedback information comprises is described first compress bitmap or described second compress bitmap, described transmitting terminal to be decoded the bitmap that described feedback information comprises according to described compress mode descriptor, generates original bitmap;
The accepting state of the packet represented by original bitmap obtained after the original bitmap that described transmitting terminal comprises according to described feedback information or decoding, resends the packet that described receiving terminal is lost.
8. the coding/decoding method of the feedback information of transfer of data according to claim 7, it is characterized in that, if the bitmap that described feedback information comprises is described first compress bitmap, described feedback information also comprises the identical and initial state mark of the accepting state of packet representated by continuous print binary number of first paragraph in the original bitmap described in described first compress bitmap corresponding to first the first code word; Described transmitting terminal to be decoded the bitmap that described feedback information comprises according to described compress mode descriptor, generates original bitmap, comprising:
According to described compress mode descriptor, described transmitting terminal judges that the described bitmap that described feedback information comprises is described first compress bitmap or described second compress bitmap;
Described first compress bitmap comprises the first code word of multiple fixed length, and each first code word comprises result code or generated code and result code, and described result code is 6 binary codes, and described generated code is 3 binary codes; First of described first code word is type codes, and described type codes describes described first code word and comprises or do not comprise described generated code; If the described bitmap that described feedback information comprises is described first compress bitmap, described transmitting terminal determines the length of each first code word according to described type codes, again according to length and described first compress bitmap of described initial state mark decoding of each first code word, generate original bitmap;
If the described bitmap that described feedback information comprises is described second compress bitmap, described transmitting terminal is encoded to described second compress bitmap according to ITU-T Recommendation coding/decoding method T.4, and generates original bitmap according to described initial state mark.
9. the receiving terminal of a transfer of data, it is characterized in that, be applied to the device of transfer of data, the device of described transfer of data comprises transmitting terminal and receiving terminal, described transmitting terminal sends packet to described receiving terminal, described receiving terminal sends the feedback information of the accepting state of data of description bag to described transmitting terminal, and described feedback information comprises bitmap; The packet that described transmitting terminal sends comprises the numbering of packet, and described receiving terminal comprises:
Receives data packets unit, for receiving the packet that described transmitting terminal sends;
Original bitmap generation unit, generate original bitmap for the accepting state according to described numbering and described packet, the length of described original bitmap is LS, LS≤511;
Original bitmap coding unit, for encoding to described original bitmap, generate compress bitmap, the length of described compress bitmap is LC; Described compress bitmap comprises the code word of multiple fixed length, and the code word of each fixed length represents figure place that is identical in described original bitmap and continuous print binary number;
Feedback information transmitting element, for being sent to transmitting terminal by the feedback information comprising described bitmap; If LS≤LC, then select described original bitmap to be the bitmap that described feedback information comprises, if described LC ﹤ LS, then select described compress bitmap to be the bitmap that described feedback information comprises; Described feedback information also comprises the compress mode descriptor that the described bitmap of description is described original bitmap or described compress bitmap; If described bitmap is described compress bitmap, described feedback information also comprises and describes the identical and initial state mark of the accepting state of packet representated by continuous print binary number of first paragraph in described compress bitmap.
10. the transmitting terminal of a transfer of data, it is characterized in that, be applied to the device of transfer of data, the device of described transfer of data comprises transmitting terminal and receiving terminal, described transmitting terminal sends packet to described receiving terminal, described receiving terminal sends the feedback information of the accepting state of data of description bag to described transmitting terminal, and described feedback information comprises bitmap; The packet that described transmitting terminal sends comprises the numbering of packet, and described transmitting terminal comprises:
Feedback information receiving element, for receiving the described feedback information that described receiving terminal sends, described feedback information also comprises the compress mode descriptor that the described bitmap of description is original bitmap or compress bitmap;
Compress bitmap decoding unit, if the bitmap comprised for described feedback information is described compress bitmap, decodes the bitmap that described feedback information comprises according to described compress mode descriptor, generates original bitmap;
Packet Generation unit, for the accepting state of the packet represented by the original bitmap comprised according to described feedback information or the original bitmap obtained after decoding, resends the packet that described receiving terminal is lost.
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