CN101931515A - Data retransmission method, system and device - Google Patents
Data retransmission method, system and device Download PDFInfo
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- CN101931515A CN101931515A CN2009100874118A CN200910087411A CN101931515A CN 101931515 A CN101931515 A CN 101931515A CN 2009100874118 A CN2009100874118 A CN 2009100874118A CN 200910087411 A CN200910087411 A CN 200910087411A CN 101931515 A CN101931515 A CN 101931515A
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Abstract
The invention discloses a data retransmission method, a data retransmission system and a data retransmission device, which are used for improving retransmission gain and improving system performance. The data retransmission method comprises that: a data sending end sends data to a data receiving end according to a preset sign position sequence; and after receiving a retransmission request sent by the data receiving end, the data sending end adjusts the sign position occupied by the data needing to be retransmitted to the data receiving end according to the sign position sequence which has been negotiated by the data sending end and the data receiving end in advance, and retransmits the data after sign position adjustment to the data receiving end.
Description
Technical field
The present invention relates to communication technical field, relate in particular to a kind of data repeating method, system and device.
Background technology
Because the business of transmitted in packets is insensitive to the time, so has proposed retransmission scheme in the prior art and improved systematic function.
Retransmission scheme as shown in Figure 1, it mainly is the codeword information behind the transmitting terminal storage coding, and to the coding after codeword information modulate, needing to obtain the data symbol of transmission, send these data symbols, receiving terminal is separated to be in harmonious proportion to these data symbols and is deciphered, send correct if this secondary data is adjudicated in the decoding back, then the information that feedback transmission is correct is given transmitting terminal and is carried out the data transmission of back, if it is wrong that this secondary data sends, then the information of feedback transmission mistake is given transmitting terminal, and at this moment transmitting terminal need be according to the codeword information of storage, again carry out data and send, receiving terminal keeps the last data that receive simultaneously.
The data message that resends can be identical with the last data message that sends, also difference to some extent, and this depends on the selection of retransmission scheme.After receiving terminal is received the data of re-transmission, carry out processing such as demodulation back and merge with the last data that receive, the data after being combined are then deciphered and decision process, thereby obtain the time diversity gain.
In the existing retransmission scheme, the character position information of each same data that send is identical, as shown in Figure 2, supposes to send N data symbol at every turn, and receiving terminal receives that the back directly merges processing to the data of prosign position.
But in the existing retransmission scheme, the variation characteristic that does not take into full account channel is to Effect on Performance, makes faster in the environment, to retransmit not obvious to the improvement of performance in channel variation such as high-speed mobile.In the general mobile communication system, all can send the frequency pilot sign that is used to estimate channel, according to the variation characteristics of wireless channel, translational speed is fast more, and channel variation is also fast more, and translational speed is slow more, and channel variation is also slow more.
Therefore, under high-speed mobile environment, the channel status that estimates by frequency pilot sign, near the channel status of the data symbol the symbolize pilots symbol well, but can not characterize channel status well from frequency pilot sign data symbol far away.Promptly have the quite good detecting performance, have relatively poor detection performance from frequency pilot sign data symbol far away from the nearer data symbol of frequency pilot sign.As shown in Figure 2, suppose the centre of frequency pilot sign at data symbol, total N data symbol, data symbol represent from frequency pilot sign from closely to far from 1 to N, and then the channel estimation results of the data symbol at the dark more character position place of color is accurate more.
In sum, in the existing retransmission scheme, the character position of the same data of double transmission is identical, be from the nearer data of frequency pilot sign the quite good detecting performance to be arranged all in the double transmission, from frequency pilot sign data far away relatively poor detection performance is arranged all, the re-transmission gain that is obtained after causing receiving terminal that data are merged is less, and is promptly also not obvious to the improvement of performance.
Summary of the invention
The embodiment of the invention provides a kind of data repeating method, system and device, retransmits gain in order to improve, and improves systematic function.
A kind of data repeating method that the embodiment of the invention provides comprises:
Data sending terminal sends the data to data receiver according to default character position order;
After data sending terminal is received the repeat requests of data receiver transmission, according to the character position order that consults with data receiver in advance, adjusting needs to retransmit the shared character position of data of giving data receiver, and gives data receiver with the adjusted data re-transmission of character position.
A kind of data capture method that the embodiment of the invention provides comprises:
Data receiver receives the data that data sending terminal sends, and the data that receive are deciphered, when decoding error, to the described data of data sending terminal request retransmission;
Data receiver receives the data that data sending terminal retransmits, and the character position order that is adopted during according to the data retransmission that consults with data sending terminal in advance, data retransmission and the last data that receive are merged processing, obtain the data that data receiver needs.
A kind of data sending device that the embodiment of the invention provides comprises:
Transmitting element is used for sending the data to data receiver according to default character position order first;
Retransmission unit, after being used to receive the repeat requests of data receiver transmission, according to the character position order that consults with data receiver in advance, adjusting needs to retransmit the shared character position of data of giving data receiver, and gives data receiver with the adjusted data re-transmission of character position.
A kind of data sink that the embodiment of the invention provides comprises:
The repeat requests unit is used to receive the data that data sending terminal sends, and the data that receive is deciphered, when decoding error, to the described data of data sending terminal request retransmission;
Merge processing unit, be used to receive the data that data sending terminal retransmits, and the character position order that is adopted during according to the data retransmission that consults with data sending terminal in advance, data retransmission and the last data that receive are merged processing, obtain the data that data receiver needs.
A kind of communication system that the embodiment of the invention provides comprises:
Data sending terminal, after being used to receive the repeat requests of data receiver transmission, according to the character position order that consults with data receiver in advance, adjusting needs to retransmit the shared character position of data of giving data receiver, and gives data receiver with the adjusted data re-transmission of character position;
Data receiver, be used to receive the data that data sending terminal retransmits, and the character position order that is adopted during according to the data retransmission that consults with data sending terminal in advance, data retransmission and the last data that receive are merged processing, obtain the data that data receiver needs.
The embodiment of the invention according to default character position order, sends the data to data receiver by data sending terminal; After data sending terminal is received the repeat requests of data receiver transmission, according to the character position order that consults with data receiver in advance, adjusting needs to retransmit the shared character position of data of giving data receiver, and give data receiver with the adjusted data re-transmission of character position, make that the bit distance between data retransmission and the frequency pilot sign is adjusted, retransmit gain thereby improved, improved systematic function.
Description of drawings
Fig. 1 is a retransmission scheme schematic diagram of the prior art;
Fig. 2 is that data of the prior art merge schematic diagram;
The schematic flow sheet of the data repeating method that Fig. 3 provides for the embodiment of the invention;
Fig. 4 merges schematic diagram for the data that the embodiment of the invention provides;
The structural representation of the communication system that Fig. 5 provides for the embodiment of the invention.
Embodiment
The embodiment of the invention provides a kind of data repeating method, system and device, retransmits gain in order to improve, and improves systematic function.
The embodiment of the invention has proposed the retransmission scheme of optimizing in order to improve the retransmission performance under the high-speed mobile environment.To the data symbol that retransmits, from the distance of frequency pilot sign, readjust the character position relation of data retransmission when sending according to the last time, during promptly last the transmission,, be placed on during re-transmission from frequency pilot sign character position far away from the nearer data symbol of frequency pilot sign; During last the transmission,, be placed on during re-transmission from the nearer character position of frequency pilot sign from frequency pilot sign data symbol far away.
Data receiver carries out the position adjustment to the data that retransmit after receiving the data retransmission that data sending terminal sends, and the character position order when obtaining with last transmission is identical, and the data of the prosign position of transmitting with the last time merge processing then.
When the data of data retransmission and last transmission not simultaneously, can carry out the position adjustment according to the importance of data, be that the importance higher data is placed on from the nearer character position of frequency pilot sign, the data that importance is lower are placed on from frequency pilot sign character position far away.
Below in conjunction with accompanying drawing the technical scheme that the embodiment of the invention provides is described.
Referring to Fig. 3, a kind of data repeating method that the embodiment of the invention provides comprises step:
S101, data sending terminal are according to default character position order, and the data that needs sent to data receiver send to data receiver.
Described character position is the bit-order that sends according to data, adopts the position of the data symbol after specific modulation system is modulated.
Character position is different with distance between frequency pilot sign, can be according to the position of certain adjustment project setting data symbol.
After S102, data sending terminal are received the repeat requests of data receiver transmission, according to the character position order that consults with data receiver in advance, adjusting needs to retransmit the shared character position of data of giving data receiver, and gives data receiver with the adjusted data re-transmission of character position.
Data sending terminal described in the embodiment of the invention can be the base station, also can be terminal or other dispensing device; Described data receiver can be the base station, also can be terminal, or other receiving system.That is to say that the data re-transmission technical scheme that the embodiment of the invention provides both can be used for the base station to the terminal data retransmission, also can be used for terminal to the base station data retransmission.
Provide concrete explaining below.
Total N data symbol needs to send when supposing each the transmission, according to the distance of frequency pilot sign from closely to far this N data symbol being sorted, ranking results is 1,2...N, be that first data symbol is from the nearest data symbol of frequency pilot sign, second data symbol is that N data symbol is from frequency pilot sign data symbol farthest from frequency pilot sign time near data symbol.
When then retransmitting, can send according to N, N-1...2,1 ordering, promptly last N the data symbol that sends is placed on first character position when retransmitting and sends, last N-1 the data symbol that sends is the 2nd data symbol after retransmitting, and last the 1st the data symbol that sends is last data symbol after retransmitting.
As shown in Figure 4, after data receiver receives data retransmission, the character position of data retransmission readjusted in proper order be 1,2...N, then, data retransmission and the last locational data of prosign that send are merged processing.
The character position order of data retransmission can be selected according to system's characteristics, for example:
The order of the character position reversed in order that adopts when adopting, the i.e. scheme of inverted order with last time transmission data;
It also can be certain interleaving scheme, set the matrix of a m*n, in the mode of row input row output, for example, transmit 9 data, be respectively from 1 to 9, generator matrix at first then, first behavior 1,2,3 of matrix, second behavior 4,5,6, the third line is 7,8,9, and the character position that is adopted when then retransmitting these 9 data is in proper order: 1,4,7,2,5,8,3,6,9, and promptly by row output.
Perhaps, also can divide into groups to data retransmission, promptly adjacent data retransmission is divided into several data sets, be that unit carries out the character position adjustment with these data sets.
But, no matter adopt which kind of character position to adjust in proper order, all need data sending terminal and data receiver to consult in advance, could carry out correct merging at data receiver like this and handle.
For example, can be pre-set multiple character position order, and character position order regulation rule, two kinds of character position orders are for example arranged, and first kind of character position is positive sequence in proper order, and second kind of character position is inverted order in proper order, character position order regulation rule adopts first kind of character position order when sending data for the first time, adopt second kind of character position order during re-transmission, the character position order that adjacent twice transmission adopted is different, promptly is used alternatingly.
Certainly, data sending terminal also can be notified to data receiver with the pairing character position of data retransmission in proper order before data retransmission is sent to data receiver.
To situation about repeatedly retransmitting, only need the character position order and different the getting final product of the last time transmission character position that data adopted order that guarantee that each data retransmission adopted.For example: during the n time transmission, the character position that adopts is 1 in proper order, 2...N, during the n+1 time transmission, the character position order that adopts can be N, N-1...2,1, it also can be scheme of interweaving of matrix etc., during the n+2 time transmission, the character position order that adopts can be the character position order that is different from the n+1 time employing, can be identical with the character position order of the n time employing, during the n+3 time transmission, the character position order that adopts can be the character position order that is different from the n+2 time employing, can be identical with the character position order of the n+1 time employing, or the like.
In transmission system, the data of different transmission priorities can be placed on the different character positions with transfer of data priority.For example: in the N that will send altogether data symbol, preceding M data symbol has higher transmission priority, then can be placed on this M data symbol from the nearer character position of frequency pilot sign and transmit, can guarantee that like this priority higher data symbol has demodulation performance preferably.Particularly in the turbo coding, systematic bits is more important with respect to check bit, can consider when therefore transmitting systematic bits is placed on the nearer character position of frequency pilot sign to transmit.
For the data receiver that receives data, a kind of data capture method that the embodiment of the invention provides comprises:
Step 1: data receiver receives the data that data sending terminal sends, and the data that receive are deciphered, when decoding error, to the described data of data sending terminal request retransmission.
Step 2: data receiver receives the data that data sending terminal retransmits, and the character position order that is adopted during according to the data retransmission that consults with data sending terminal in advance, data retransmission and the last data that receive are merged processing, obtain the data that data receiver needs.
Preferably, the character position order that data receiver is adopted during according to the data retransmission that consults with data sending terminal in advance comprises data retransmission and the step that the last data that receive merge processing:
The character position order that data receiver is adopted during according to the data retransmission that consults with data sending terminal in advance, with the character position order that data retransmission adopted, it is identical to be adjusted into the character position that data the adopted order that receives with the last time, then the locational data of prosign is merged processing.
Referring to Fig. 5, a kind of communication system that the embodiment of the invention provides comprises: data sending terminal 11 and at least one data receiver 12.
Preferably, data sending terminal 11 comprises:
Transmitting element 111 first, are used for according to default character position order, and the data that needs sent to data receiver 12 send to data receiver 12.
Preferably, described retransmission unit 112, according to sending the order of character position reversed in order that data adopted with the last time to data receiver 12 with data receiver 12 is that consult in advance, adjusting needs to retransmit the shared character position of data of giving data receiver 12; Perhaps,
Described retransmission unit 112, according to the character position order regulation rule that consults with data receiver 12 in advance, determine the character position order of current employing, and adjust the shared character position of data that needs to retransmit to data receiver 12 in proper order according to the character position of current employing; Perhaps,
Described retransmission unit 112, according to the data re-transmission priority that consults with data receiver 12 in advance, adjusting needs to retransmit the shared character position of data of giving data receiver 12.
Preferably, described retransmission unit 112, when repeatedly to data receiver 12 data retransmissions, the character position order that adjacent twice re-transmission adopted is different.
Preferably, described retransmission unit 112 also is used for before giving data receiver 12 with data re-transmission the pairing character position of data retransmission being notified to data receiver 12 in proper order.
Preferably, described data receiver 12 comprises:
Preferably, described merging processing unit 122, the character position order that is adopted during according to the data retransmission that consults with data sending terminal 11 in advance, with the character position order that data retransmission adopted, it is identical to be adjusted into the character position that data the adopted order that receives with the last time, then the locational data of prosign is merged processing.
In sum, according to default character position order, the data that needs sent to data receiver send to data receiver to the embodiment of the invention by data sending terminal; After data sending terminal is received the repeat requests of data receiver transmission, according to the character position order that consults with data receiver in advance, adjusting needs to retransmit the shared character position of data of giving data receiver, and give data receiver with the adjusted data re-transmission of character position, make that the bit distance between data retransmission and the frequency pilot sign is adjusted, retransmit gain thereby improved, improved systematic function, optimized existing retransmission scheme, the system after optimizing that makes can resist the quick performance impact that changes retransmission scheme of high-speed mobile environment lower channel better, improves the performance of retransmission scheme under the high-speed mobile.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (13)
1. a data repeating method is characterized in that, this method comprises:
Data sending terminal sends the data to data receiver according to default character position order;
After data sending terminal is received the repeat requests of data receiver transmission, according to the character position order that consults with data receiver in advance, adjusting needs to retransmit the shared character position of data of giving data receiver, and gives data receiver with the adjusted data re-transmission of character position.
2. method according to claim 1 is characterized in that, data sending terminal is according to the character position order that consults with data receiver in advance, adjusts the step that needs to retransmit the shared character position of the data of giving data receiver and comprises:
Data sending terminal sends the order of character position reversed in order that data adopted with the last time to data receiver according to what consult with data receiver in advance, and adjusting needs to retransmit the shared character position of data of giving data receiver; Perhaps,
Data sending terminal is according to the character position order regulation rule that consults with data receiver in advance, determine the character position order of current employing, and adjust the shared character position of data that needs to retransmit to data receiver in proper order according to the character position of current employing; Perhaps,
Data sending terminal is according to the data re-transmission priority that consults with data receiver in advance, and adjusting needs to retransmit the shared character position of data of giving data receiver.
3. method according to claim 1 is characterized in that, when described data sending terminal during repeatedly to the data receiver data retransmission, the character position order that adjacent twice re-transmission adopted is different.
4. according to claim 1,2 or 3 described methods, it is characterized in that described data sending terminal is given data re-transmission before the data receiver, this method also comprises:
Data sending terminal is notified to data receiver in proper order with the pairing character position of data retransmission.
5. a data capture method is characterized in that, this method comprises:
Data receiver receives the data that data sending terminal sends, and the data that receive are deciphered, when decoding error, to the described data of data sending terminal request retransmission;
Data receiver receives the data that data sending terminal retransmits, and the character position order that is adopted during according to the data retransmission that consults with data sending terminal in advance, data retransmission and the last data that receive are merged processing, obtain the data that data receiver needs.
6. method according to claim 1, it is characterized in that, the character position order that data receiver is adopted during according to the data retransmission that consults with data sending terminal in advance comprises data retransmission and the step that the last data that receive merge processing:
The character position order that data receiver is adopted during according to the data retransmission that consults with data sending terminal in advance, with the character position order that data retransmission adopted, it is identical to be adjusted into the character position that data the adopted order that receives with the last time, then the locational data of prosign is merged processing.
7. a data sending device is characterized in that, this device comprises:
Transmitting element is used for sending the data to data receiver according to default character position order first;
Retransmission unit, after being used to receive the repeat requests of data receiver transmission, according to the character position order that consults with data receiver in advance, adjusting needs to retransmit the shared character position of data of giving data receiver, and gives data receiver with the adjusted data re-transmission of character position.
8. device according to claim 7, it is characterized in that, described retransmission unit, send the order of character position reversed in order that data adopted with the last time to data receiver according to what consult with data receiver in advance, adjusting needs to retransmit the shared character position of data of giving data receiver; Perhaps,
Described retransmission unit, according to the character position order regulation rule that consults with data receiver in advance, determine the character position order of current employing, and adjust the shared character position of data that needs to retransmit to data receiver in proper order according to the character position of current employing; Perhaps,
Described retransmission unit, according to the data re-transmission priority that consults with data receiver in advance, adjusting needs to retransmit the shared character position of data of giving data receiver.
9. device according to claim 7 is characterized in that, described retransmission unit, and when repeatedly to the data receiver data retransmission, the character position order that adjacent twice re-transmission adopted is different.
10. according to claim 7,8 or 9 described devices, it is characterized in that described retransmission unit also is used for before giving data receiver with data re-transmission the pairing character position of data retransmission being notified to data receiver in proper order.
11. a data sink is characterized in that, described device comprises:
The repeat requests unit is used to receive the data that data sending terminal sends, and the data that receive is deciphered, when decoding error, to the described data of data sending terminal request retransmission;
Merge processing unit, be used to receive the data that data sending terminal retransmits, and the character position order that is adopted during according to the data retransmission that consults with data sending terminal in advance, data retransmission and the last data that receive are merged processing, obtain the data that data receiver needs.
12. device according to claim 11, it is characterized in that, described merging processing unit, the character position order that is adopted during according to the data retransmission that consults with data sending terminal in advance, with the character position order that data retransmission adopted, it is identical to be adjusted into the character position that data the adopted order that receives with the last time, then the locational data of prosign is merged processing.
13. a communication system is characterized in that, this system comprises:
Data sending terminal, after being used to receive the repeat requests of data receiver transmission, according to the character position order that consults with data receiver in advance, adjusting needs to retransmit the shared character position of data of giving data receiver, and gives data receiver with the adjusted data re-transmission of character position;
Data receiver, be used to receive the data that data sending terminal retransmits, and the character position order that is adopted during according to the data retransmission that consults with data sending terminal in advance, data retransmission and the last data that receive are merged processing, obtain the data that data receiver needs.
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| CN2009100874118A CN101931515A (en) | 2009-06-19 | 2009-06-19 | Data retransmission method, system and device |
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| CN107944400A (en) * | 2017-11-28 | 2018-04-20 | 广东小天才科技有限公司 | One kind is taken pictures searching method, device and intelligent terminal |
| JPWO2019064815A1 (en) * | 2017-09-27 | 2020-11-05 | ソニー株式会社 | Wireless LAN communication device, wireless LAN communication method and wireless LAN communication program |
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