CN101282202A - Mixed automatic repeat request method and data transmission system - Google Patents
Mixed automatic repeat request method and data transmission system Download PDFInfo
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- CN101282202A CN101282202A CNA2007100907409A CN200710090740A CN101282202A CN 101282202 A CN101282202 A CN 101282202A CN A2007100907409 A CNA2007100907409 A CN A2007100907409A CN 200710090740 A CN200710090740 A CN 200710090740A CN 101282202 A CN101282202 A CN 101282202A
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Abstract
The present invention discloses a hybrid automatic repeat request method and a data transmission system, wherein, the method comprises the following steps: S102, receiving the data from a transmitting end and decoding by a receiving end, transmitting a transmission acknowledge signal to the transmitting end by the receiving end through a reverse chain circuit at the state that the decoding is successful, and transmitting a retransmission signal to the transmitting end at the state of decoding failure; S104, when the transmitting end receives the retransmission signal, forming a space-time/frequency coded space-time transmission diversity with the data which needs retransmission and the data that is transmitted firstly and transmitting to the receiving end; and S106, combining the received retransmission data and the stored code by the receiving end and decoding, and repeatedly executing the steps from S102 to S106 at the state of decoding failure. The method of the invention has the advantages of reduced retransmission time, high retransmission gain and increased reliability of the data transmission.
Description
Technical field
The present invention relates to the communications field, relate more specifically to a kind of mixed automatic repeat request method and data transmission system.
Background technology
Along with to the developing rapidly of two-forty, reliable professional demand, mixed automatic repeat request (Hybrid Automatic Repeat Request is called for short HARQ) technology becomes one of key technology of 3G mobile communication system.In order in time-variant wireless channel, to improve efficiency of transmission as much as possible, improve transmission performance, 3GPP and 3GPP2 have adopted adaptive coding/modulation (Adaptive Modulation and Coding, be called for short AMC) and mixed automatic repeat request (Automatic Repeat Request is called for short ARQ) technology.The AMC technology is to select transformat according to channel quality, and HARQ then retransmits the transmission block of decoding failure, and HARQ provides accurate code rate to regulate based on channel condition, can adapt to instantaneous channel conditions automatically, and insensitive to time delay and error.
The HARQ technology is effectively in conjunction with forward error correction (Forward Error Correction is called for short FEC) technology and automatic repeat requests technology, and is more reliable than FEC.According to the mode that forward error correction coding among the HARQ merges at receiving terminal, HARQ can be divided three classes:
Type?I?HARQ：
In this simple HARQ scheme, data are carried out cyclic redundancy check (CRC) (CyclicRedundancy Check is called for short CRC) and encode with FEC.Monitor the grouping quality at the receiving terminal fec decoder and with CRC.Wrong if divide into groups, just retransmit, and wrong grouping is dropped, retransmission packet adopts and last identical coding.So each probability that is correctly decoded that retransmits is identical and lower.
Type?II?HARQ：
The second class HARQ scheme belongs to the steadily increase redundancy ARQ scheme of (Incremental Redundancy is called for short IR).This scheme has been considered the time difference characteristic of radio propagation channel.When transmission data block first not or have a less redundancy.If bust this, re-transmission will begin.The data block that retransmits is not duplicating of the data block that passes first, but has increased redundancy section wherein.At receiving terminal the data block of receiving for twice is merged, code rate decreases but has improved coding gain.
Type?III?HARQ：
The HARQ scheme of the 3rd class also belongs to incremental redundancy scheme, what it was different with the second class HARQ is to retransmit code word to have the self-demarking code ability, therefore receiving terminal can be directly from retransmitting the restore data of decoding in the middle of the code word, the code word that also can retransmit code word and existing buffer memory with makeing mistakes merge the back and decode.According to the redundancy versions difference that retransmits, the 3rd class HARQ can be divided into two kinds: a kind of is the 3rd class HARQ that only has a redundancy versions, be also referred to as first kind HARQ with soft merging, each time retransmit redundancy versions all with transmit identical (ChaseCombing catches up with merging) first time.Another kind is the 3rd class HARQ with a plurality of redundancy versions.
Chase Combining transmitting terminal retransmits at every turn and uses identical FEC coded data grouping, and this point is identical with type I.But wrong grouping is stored in receiving terminal, and these send the copy of grouping to the decoder of receiving terminal according to the SNR weighted array that receives.Like this, obtained the time diversity gain.Chase merges that required receiving terminal buffer memory is less, and signaling is simple relatively, is the low sign indicating number merging mode of a kind of complexity.
Summary of the invention
In view of above-mentioned one or more problems, the present invention proposes a kind of mixed automatic repeat request method and data transmission system.
H-arq method according to the present invention may further comprise the steps: S102, receiving terminal receives from the data of the transmitting terminal row decoding of going forward side by side, under successfully decoded situation, receiving terminal will send confirmation signal by reverse link and send to transmitting terminal, under the situation of decoding failure, receiving terminal sends re-transmitted signal to transmitting terminal; S104, after transmitting terminal receives re-transmitted signal, when the data that needs are retransmitted form sky with the data that send first/space-time emission diversity that frequency encoded is sent to receiving terminal; And S106, receiving terminal merges laggard row decoding with the data retransmission that receives and the data of preservation, and under the situation of decoding failure, repeated execution of steps S102 is to step S106.
Wherein, in step S102, when receiving terminal sends re-transmitted signal, number of retransmissions is counted by retransmission counter.
Under number of retransmissions surpassed the situation of predetermined value, receiving terminal was determined decoding failure, exported current decode results and with the retransmission counter zero clearing.The h-arq method is used for mimo systems.
Data transmission system according to the present invention comprises: data sending device, be used for data are sent to data sink, and after the re-transmitted signal that receives from data sink, when the data that needs are retransmitted form sky with the data that send first/space-time emission diversity that frequency encoded is sent to data sink; Data sink, be used to receive from the data of data sending device and to data and decipher, under successfully decoded situation, will send confirmation signal by reverse link and send to data sending device, under the situation of decoding failure, send re-transmitted signal to data sending device.
Wherein, data sending device comprises: first data storage is used to store the data that are sent to data sink first; And the re-transmission control module, be used under situation about receiving from the re-transmitted signal of data sink, in the time of will forming sky with the data that send first in the data storage/space-time emission diversity that frequency encoded is sent to data sink.
Wherein, data sink comprises: Data Receiving and decoding module, be used to receive from the data of data sending device and to data and decipher, and receiving under the situation of data retransmission, the data in the data retransmission and second data storage are merged laggard row decoding; Retransmission counter is used in re-transmitted signal number of retransmissions being counted; And second data storage, be used to store and fetch the data that send from data sending device.
By the present invention, can reduce number of retransmissions, obtain higher re-transmission gain, improve reliability of data transmission.
Description of drawings
Accompanying drawing described herein is used to provide further understanding of the present invention, constitutes the application's a part, and illustrative examples of the present invention and explanation thereof are used to explain the present invention, do not constitute improper qualification of the present invention.In the accompanying drawings:
Fig. 1 is the flow chart according to the mixed automatic repeat request method of the embodiment of the invention;
Fig. 2 is according to the transmitting terminal of space-time emission diversity HARQ in the mimo system of the embodiment of the invention and the schematic diagram of receiving terminal;
Fig. 3 is according to the first of the embodiment of the invention and retransmits the space-time emission diversity form;
Fig. 4 is the space-time emission diversity HARQ process chart according to the embodiment of the invention; And
Fig. 5 is the block diagram according to the data transmission system of the embodiment of the invention.
Embodiment
Below with reference to accompanying drawing, describe the specific embodiment of the present invention in detail.
With reference to figure 1, the mixed automatic repeat request method according to the embodiment of the invention is described.As shown in Figure 1, this h-arq method may further comprise the steps: S102, receiving terminal receives from the data of the transmitting terminal row decoding of going forward side by side, under successfully decoded situation, receiving terminal will send confirmation signal by reverse link and send to transmitting terminal, under the situation of decoding failure, receiving terminal sends re-transmitted signal to transmitting terminal; S104, after transmitting terminal receives re-transmitted signal, when the data that needs are retransmitted form sky with the data that send first/space-time emission diversity that frequency encoded is sent to receiving terminal; And S106, receiving terminal merges laggard row decoding with the data retransmission that receives and the data of preservation, and under the situation of decoding failure, repeated execution of steps S102 is to step S106.
Wherein, in step S102, when receiving terminal sends re-transmitted signal, number of retransmissions is counted by retransmission counter.
Under number of retransmissions surpassed the situation of predetermined value, receiving terminal was determined decoding failure, exported current decode results and with the retransmission counter zero clearing.The h-arq method is used for mimo systems.
Referring to figs. 2 to Fig. 4, the flow chart according to space-time emission diversity HARQ in the mimo system of the embodiment of the invention is described.Fig. 2 shows transmitting terminal and the receiving terminal of space-time emission diversity HARQ in the mimo system; Fig. 3 shows the first and re-transmission space-time emission diversity form in the mimo system; Fig. 4 shows the handling process according to the space-time emission diversity HARQ in the mimo system of the embodiment of the invention.As shown in Figure 4, this handling process may further comprise the steps:
S402, information source produces information sequence.
S404, information sequence enters channel encoder, and channel encoder interweaves, modulates information sequence.
S406, the symbol after the transmitting terminal memory stores coded modulation, and the symbol after the coded modulation carried out many antenna processing (spatial reuse or space diversity), then by two (number of transmit antennas is variable) antennas emissions.
S408 carries out many antenna processing (spatial reuse or space diversity) to the symbol through coding.
S410 will be sent to receiver through the symbol after the too much antenna processing by mimo channel.
To the superpose received signal of noise of S412, receiving terminal is stored in the memory.
S414, receiving terminal by the stack that receives the received signal of noise carry out channel estimating.
S416, receiving terminal carry out and the corresponding many antenna processing of transmitting terminal to received signal.
S418, the decoder of receiving terminal is deciphered to received signal.
S420, if successfully decoded, then receiving terminal sends confirmation signal (ACK) by reverse link and gives transmitting terminal, empties the receiving terminal memory simultaneously.
S422, if decoding failure, then receiving terminal sends recurrent signal (NACK), the retransmission counter of receiving terminal adds 1 simultaneously.
S424, receiving terminal judge whether retransmission counter surpasses maximum retransmission.
If S426 greater than maximum retransmission, then no longer retransmits, and thinks decoding failure, exports current decode results, at this moment, the memory of transmitting terminal and receiving terminal is all emptied, and the retransmission counter zero clearing enters memory after the encoded modulation of next time slot data.
S428 if be not more than maximum retransmission, then continues to retransmit, till correct reception.
S430, transmitting terminal judge that the signal of receiving terminal feedback is ACK or NACK signal.
S432 receives at transmitting terminal under the situation of NACK signal, and the content in the transmitting terminal memory is retransmitted, but be not simple repeating transmission this moment, but when forming sky with first content/space-time emission diversity of frequency coding, obtaining the diversity gain on the space, first with retransmit form as shown in Figure 3.
S434 transmits data retransmission through mimo channel.
S436, receiving terminal receive the re-transmitted signal of the noise that superposeed, and the content of the preservation in re-transmitted signal and the memory is merged.
S438, the content after decoder for decoding merges.
S440 receives at transmitting terminal under the situation of ack signal, empties the content of memory.
S442, transmitting terminal are ready for sending the data of next time slot.
Wherein, the merging mode among the step S436 can adopt any among Type I, Type II, the Type III, viewing system concrete condition and deciding.
With reference to figure 5, the data transmission system according to the embodiment of the invention is described.As shown in Figure 5, this data transmission system comprises: data sending device 502, be used for data are sent to data sink, and after the re-transmitted signal that receives from data sink, when the data that needs are retransmitted form sky with the data that send first/space-time emission diversity that frequency encoded is sent to data sink; Data sink 504, be used to receive from the data of data sending device and to data and decipher, under successfully decoded situation, will send confirmation signal by reverse link and send to data sending device, under the situation of decoding failure, send re-transmitted signal to data sending device.
Wherein, data sending device 502 comprises: first data storage 5022 is used to store the data that are sent to data sink first; And retransmit control module 5024, be used under situation about receiving from the re-transmitted signal of data sink, in the time of will forming sky with the data that send first in the data storage/space-time emission diversity that frequency encoded is sent to data sink.
Wherein, data sink 504 comprises: Data Receiving and decoding module 5042, be used to receive from the data of data sending device and to data and decipher, and receiving under the situation of data retransmission, the data in the data retransmission and second data storage are merged laggard row decoding; Retransmission counter 5044 is used in re-transmitted signal number of retransmissions being counted; And second data storage 5046, be used to store and fetch the data that send from data sending device.
By the present invention, can reduce number of retransmissions, obtain higher re-transmission gain, improve reliability of data transmission.
The above is the preferred embodiments of the present invention only, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.Within the spirit and principles in the present invention all, any modification of being done, be equal to replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (9)
1. a h-arq method is characterized in that, may further comprise the steps:
S102, receiving terminal receives from the data of the transmitting terminal row decoding of going forward side by side, and under successfully decoded situation, described receiving terminal will send confirmation signal by reverse link and send to transmitting terminal, under the situation of described decoding failure, described receiving terminal sends re-transmitted signal to described transmitting terminal;
S104, after described transmitting terminal receives described re-transmitted signal, when the data that needs are retransmitted form sky with the data that send first/space-time emission diversity that frequency encoded is sent to described receiving terminal; And
S106, the described data retransmission that described receiving terminal will receive and the data of preservation merge laggard row decoding, and under the situation of decoding failure, repeated execution of steps S102 is to step S106.
2. h-arq method according to claim 1 is characterized in that, in described step S102, when described receiving terminal sends described re-transmitted signal, by retransmission counter number of retransmissions is counted.
3. h-arq method according to claim 2 is characterized in that, under described number of retransmissions surpassed the situation of predetermined value, described receiving terminal was determined decoding failure, exports current decode results and with described retransmission counter zero clearing.
4. according to each described h-arq method in the claim 1 to 3, it is characterized in that described h-arq method is used for mimo systems.
5. data transmission system is characterized in that comprising:
Data sending device, be used for data are sent to data sink, and after the re-transmitted signal that receives from described data sink, when the data that needs are retransmitted form sky with the data that send first/space-time emission diversity that frequency encoded is sent to described data sink;
Described data sink, be used to receive from the described data of described data sending device and to described data and decipher, under successfully decoded situation, to send confirmation signal by reverse link and send to data sending device, under the situation of described decoding failure, send re-transmitted signal to described data sending device.
6. data transmission system according to claim 5 is characterized in that, described data sending device comprises:
First data storage is used to store the data that are sent to described data sink first; And
Retransmit control module, be used under situation about receiving from the re-transmitted signal of described data sink, in the time of will forming sky with the data that send first in the described data storage/space-time emission diversity that frequency encoded is sent to described data sink.
7. data transmission system according to claim 6 is characterized in that, described data sink comprises:
Data Receiving and decoding module are used to receive from the data of described data sending device and to described data and decipher, and receiving under the situation of data retransmission, and the data in the described data retransmission and second data storage are merged laggard row decoding;
Retransmission counter is used in described re-transmitted signal number of retransmissions being counted; And
Described second data storage is used to store the data that fetch from described data sending device transmission.
8. data transmission system according to claim 7 is characterized in that, under described number of retransmissions surpassed the situation of predetermined value, described data sink was determined decoding failure, exports current decode results and with described retransmission counter zero clearing.
9. according to each described data transmission system in the claim 5 to 8, it is characterized in that described data transmission system is a mimo systems.
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| CNA2007100907409A CN101282202A (en) | 2007-04-02 | 2007-04-02 | Mixed automatic repeat request method and data transmission system |
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| CNA2007100907409A CN101282202A (en) | 2007-04-02 | 2007-04-02 | Mixed automatic repeat request method and data transmission system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102255710A (en) * | 2011-04-15 | 2011-11-23 | 电信科学技术研究院 | Method and device for storing encoding block |
| CN102647383A (en) * | 2011-02-18 | 2012-08-22 | 无锡物联网产业研究院 | Data transmission method and data transmission system applied to OFDM (Orthogonal Frequency Division Multiplexing) baseband system |
| CN103281166A (en) * | 2013-05-15 | 2013-09-04 | 北京邮电大学 | Hybrid automatic repeat request transmission method based on polarization code |
| CN107113114A (en) * | 2014-12-16 | 2017-08-29 | 华为技术有限公司 | Method and node in wireless communication system |
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2007
- 2007-04-02 CN CNA2007100907409A patent/CN101282202A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102647383A (en) * | 2011-02-18 | 2012-08-22 | 无锡物联网产业研究院 | Data transmission method and data transmission system applied to OFDM (Orthogonal Frequency Division Multiplexing) baseband system |
| CN102255710A (en) * | 2011-04-15 | 2011-11-23 | 电信科学技术研究院 | Method and device for storing encoding block |
| CN102255710B (en) * | 2011-04-15 | 2014-01-29 | 电信科学技术研究院 | Method and device for storing encoding block |
| US9402201B2 (en) | 2011-04-15 | 2016-07-26 | China Academy Of Telecommunications Technology | Method and apparatus for storing code block |
| CN103281166A (en) * | 2013-05-15 | 2013-09-04 | 北京邮电大学 | Hybrid automatic repeat request transmission method based on polarization code |
| CN103281166B (en) * | 2013-05-15 | 2016-05-25 | 北京邮电大学 | A kind of mixed automatic retransfer request transmission method based on polarization code |
| CN107113114A (en) * | 2014-12-16 | 2017-08-29 | 华为技术有限公司 | Method and node in wireless communication system |
| US10454628B2 (en) | 2014-12-16 | 2019-10-22 | Huawei Technologies Co., Ltd. | Methods and nodes in a wireless communication system |
| CN107113114B (en) * | 2014-12-16 | 2020-09-11 | 华为技术有限公司 | Method and node in a wireless communication system |
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