CN104283651B - It is a kind of to mix the method retransmitted - Google Patents
It is a kind of to mix the method retransmitted Download PDFInfo
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- CN104283651B CN104283651B CN201310270829.9A CN201310270829A CN104283651B CN 104283651 B CN104283651 B CN 104283651B CN 201310270829 A CN201310270829 A CN 201310270829A CN 104283651 B CN104283651 B CN 104283651B
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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]
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- Computer Networks & Wireless Communication (AREA)
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- Detection And Prevention Of Errors In Transmission (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
A kind of to mix the method retransmitted, methods described includes：The code block number malfunctioned after statistics previous transmission and the code block number malfunctioned after this transmission；According to the code block number and the ratio of the code block number malfunctioned after previous transmission malfunctioned after this transmission, and default handoff threshold value, transmission next time selection code block CB is retransmitted or transmission block TB is retransmitted, and the handoff threshold value is more than 0 and less than or equal to 1.After the embodiment of the present invention, overhead can be reduced, and then make full use of system resource on the premise of throughput of system is ensured.
Description
Technical field
The application is related to communication technical field, more particularly, to a kind of method for mixing and retransmitting.
Background technology
Hybrid automatic repeat-request（HARQ）Technology is arq（ARQ）Technology and forward error correction（FEC）Skill
The error control method that art is combined.At present, in the HARQ retransmission techniques of the wireless communication standards such as LTE, to each user, such as
Fruit just passes mistake, then using the transmission block based on transport block size（TB）To carry out the re-transmission of data.
For example, in LTE system, if transmission block TB bit number is more than the input that Turbo as defined in LTE protocol is encoded
During 6144 bit of full-size of bit, then code block is carried out to transmission block（CB）Dividing processing, and the code block to be each partitioned into
Do CRC codings（As shown in Figure 1）.
In principle, HARQ retransmit both can the TB CRC based on transmission block re-transmission is performed to whole transmission block, can also be
CB CRC inside one transmission block using each code block are only carried out at HARQ re-transmissions as foundation to the code block CB for producing error of transmission
Reason.
It is the retransmission mechanism based on TB for the first situation referring to accompanying drawing 2, only TB CRC checks bit can profit
With according to unique TB CRC error detections state generation ACK/NACK identification feedbacks to transmitting terminal, then transmitting terminal is according to the mark
Determine to send new data or carry out HARQ re-transmissions.There is error of transmission in S2 and S4 in first time transmitting procedure, feed back NACK；
There is error of transmission in S4 during second of transmission, feeds back NACK；Do not occur error of transmission in third time transmitting procedure, feed back
ACK。
Referring to accompanying drawing 3, it is the retransmission mechanism based on CB for second of situation, here because TB length is larger, therefore adopts
ACK/NACK marks are produced with CB CRC checks bit.Due to may have comprising not having vicious code block in segmentation code block CB
The CRC error detections state of a little code blocks is error-free, can only retransmit the segmentation code block for having mistake, advantageously reduce the burden of transmission, increase
The handling capacity of system.There is error of transmission in S2 and S4 in first time transmitting procedure, only feed back NACK in S2 and S4 CB；The
S2 and S4 are transmitted again in secondary transmitting procedure, due to S2 CB feeding back ACKs, S4 CB feedbacks NACK；Third time transmitting procedure
In only transmit S4, S4 CB feeding back ACKs again.
In terms of HARQ retransmission mechanism, in addition to it can use the retransmission scheme based on TB, CB codes are based on there is also some
The implementation that block is retransmitted.Although can significantly improve the handling capacity of system based on CB retransmission schemes, but also increase significantly
The expense of system is added.
Spatial reuse situation is not mapped as TB, the transport block size TBS that LTE standard is provided is in 16~75376 ratios
Between spy, the number for the code block CB so split is between 1~13.If in first transmission, 13 code block only wrong one
Individual, it is undoubtedly a greatly waste to system resource to be retransmitted according to TB.But if 13 code blocks only right 1, if
It is then limited to systematic function lifting using CB re-transmissions, but accordingly considerably increase the expense of system.
Two layers of spatial reuse situation is mapped as TB, the transport block size TBS that LTE standard is provided is in 32~149776 ratios
Between spy, the number for the code block CB so split is between 1~25.Likewise, due to the increase of CB block numbers, meeting the problem of same
It is more prominent and serious.
Therefore, for retransmitting both modes based on TB and based on CB, although the former can bring throughput of system most
Smallization, namely overhead minimum, the latter can bring the maximization of throughput of system, namely overhead is maximized,
But balance can not be all obtained between handling capacity and overhead.
The content of the invention
The embodiment of the present invention proposes a kind of method for mixing and retransmitting, can be on the premise of throughput of system is ensured, reduction
Overhead, and then make full use of system resource.
The technical scheme of the embodiment of the present invention is as follows：
A kind of to mix the method retransmitted, methods described includes：
The code block number malfunctioned after statistics previous transmission and the code block number malfunctioned after this transmission；
According to the code block number and the ratio of the code block number malfunctioned after previous transmission malfunctioned after this transmission, and preset
Handoff threshold value, transmission selection next time code block CB is retransmitted or transmission block TB is retransmitted, the handoff threshold value be more than 0 and less than etc.
In 1.
The ratio according to the code block number malfunctioned after this transmission and the code block number malfunctioned after previous transmission, and
Default handoff threshold value, transmission next time selection code block CB is retransmitted or transmission block TB re-transmissions include：
After this transmission the ratio of the code block number of code block number for malfunctioning with being malfunctioned after previous transmission be more than 0 and less than etc.
In the handoff threshold value, then transmission next time selection CB re-transmissions.
The ratio according to the code block number malfunctioned after this transmission and the code block number malfunctioned after previous transmission, and
Default handoff threshold value, selection code block CB is retransmitted or transmission block TB re-transmissions include：
The ratio of code block number of the code block number malfunctioned after this transmission with being malfunctioned after previous transmission is more than the switching
Threshold value and less than or equal to 1, then transmission next time selection TB is retransmitted.
When transmitting first, the code block number malfunctioned after the previous transmission is equal to the number for transmitting CB first.
The default handoff threshold value is equal to 0.5.
As can be seen that the code block number malfunctioned in embodiments of the present invention after statistics previous transmission from above-mentioned technical proposal
With the code block number malfunctioned after this transmission；Then, according to the code block number malfunctioned after this transmission with being malfunctioned after previous transmission
Code block number ratio, and default handoff threshold value, transmission selection next time CB is retransmitted or TB is retransmitted.It can so protect
On the premise of demonstrate,proving throughput of system, overhead is reduced, and then make full use of system resource.
Brief description of the drawings
Fig. 1 is the schematic diagram that TB is divided into CB；
Fig. 2 is the HARQ realization principle schematic diagrames based on TB；
Fig. 3 is the HARQ realization principle schematic diagrames based on CB；
The method flow schematic diagram that Fig. 4 retransmits for mixing；
Fig. 5 is HARQ mechanism handling capacity comparison schematic diagram under the conditions of MCS2；
Fig. 6 is HARQ mechanism handling capacity comparison schematic diagram under the conditions of MCS6.
Embodiment
It must be more clearly understood to express the object, technical solutions and advantages of the present invention, below in conjunction with the accompanying drawings and specifically
The present invention is further described in more detail for embodiment.
In embodiments of the present invention, suitable retransmission scheme is determined according to the code block number of error, can be handled up in realization
Amount is maximized simultaneously, and the ACK/NACK feedbacks and resource for reducing system indicate control overhead.
It is the method flow schematic diagram that mixing is retransmitted referring to accompanying drawing 4, specifically includes following steps：
401st, the code block number malfunctioned after statistics previous transmission and the code block number malfunctioned after this transmission.
The code block number malfunctioned after previous transmission and the code block number malfunctioned after this transmission are counted according to prior art.
402nd, according to the ratio of the code block number malfunctioned after the code block number and previous transmission malfunctioned after this transmission, and
Default handoff threshold value, transmission selection next time CB is retransmitted or TB is retransmitted
Represent the CB block number mesh transmitted first.
Represent code block number wrong after transmitting first.
Represent the L times transmission（I.e. the L-1 times HARQ is retransmitted）Wrong code block number afterwards.
K is the handoff threshold value that TB and CB is retransmitted, can also depending on the selection of K values both can be according to real system environment
It is fixed as specific a value, such as 0.5 in advance.
L represents the number of transmissions, and value is positive integer, and transmission first uses TB modes.Transmission refers to whole transmission block first
First time transmit, it is necessary to transmit whole TB blocks（That is all CB blocks in TB）, because all CB have been included in TB, thus it is first
Secondary transmission is equal to CB transmission using TB transmission.
Scheme one：If met0 ＜ K≤1, next time, transmission used CB retransmission schemes.
Scheme two：If met0 ＜ K≤1, next time, transmission used TB retransmission schemes.
（a）Whether transmit first or after HARQ is retransmitted, as long as successfully decoded, just the ACK of 1 bit of feedback believes
Breath, terminates this HARQ process.
（b）If the code block number malfunctioned after transmitting first meets scheme one, to what is malfunctioned in M code block
Individual code block feedbackIndividual NACK bit informations, remainingIndividual code block feeding back ACK bit information, wherein M is to divide
The code block CB cut number, next time, transmission used CB retransmission schemes.
If the code block number of loading error occurring meets scheme two first, the nack message of 1 bit is fed back, next time, transmission was adopted
Use TB retransmission schemes.
（c）If the L times transmission（I.e. the L-1 times HARQ is retransmitted）The code block number malfunctioned afterwards meets scheme one, then to M
Malfunctioned in code blockIndividual code block feedbackIndividual NACK bit informations, remainingIndividual code block feedback
ACK bit information, next time, transmission used CB retransmission schemes.
If the L times transmission（I.e. the L-1 times HARQ is retransmitted）The code block number malfunctioned afterwards meets scheme two, then feeds back 1 and compare
Special nack message, transmission next time uses TB retransmission schemes, namely needs to carry out HARQ re-transmissions to whole code blocks of this transmission.
The technique effect of the lower surface analysis present invention
For wireless communication system, in order to meet the performance of link adaptation techniques, typically require that Block Error Rate is less than 10-1,
Otherwise system will be unable to work.Therefore, in the inventive solutions, for TB retransmission schemes, it is a small probability
Event, only occurs this retransmission scheme in the case of low signal-to-noise ratio.
Compared with based on CB retransmission schemes, only need to feed back the NACK of 1 bit in once transmitting based on TB retransmission schemes
Information, is not rely on the code block number of transmission, therefore saves system physical resource.
And TB/CB mixing retransmission scheme is between both modes, dependent on code block number in terms of feedback overhead
The probability that mesh and both modes occur.The feedback quantity expense of these three HARQ mechanisms is analyzed in table 1.
Table 1
| HARQ retransmission schemes | Probability of occurrence | Feedback quantity（Bit number） |
| TB | 1 | 1 |
| CB | 1 | M |
| TB/CB is mixed | PA/1-PA | 1×PA+M×(1-PA) |
Citing is explained below：The probability P occurred when code block number M=13, TB retransmission schemesAWhen=0.6, then based on TB
The expense of retransmission scheme is 1 bit, and the expense based on CB retransmission schemes is 13 bits, and based on TB/CB mixing retransmission schemes
Expense is the bit of 1 × 0.6+13 × 0.4=5.8.
The throughput performance comparative analysis that technical solution of the present invention given below is retransmitted with TB and CB is retransmitted, simulated conditions are such as
Shown in table 2.
Table 2
Accompanying drawing 5 gives the handling up based on TB, CB, TB/CB retransmission scheme under the conditions of maximum retransmission N=1, MCS2
Amount performance curve compares.
Accompanying drawing 6 gives the handling up based on TB, CB, TB/CB retransmission scheme under the conditions of maximum retransmission N=1, MCS6
Amount performance curve compares.Wherein, handoff threshold value K=0.5 that TB and CB is retransmitted.
It can be seen that from accompanying drawing 5 and accompanying drawing 6：
(1) compared with based on TB retransmission schemes, the throughput performance lifting based on CB retransmission schemes is obvious, based on TB/CB
Mixing retransmission scheme is somewhat inferior to the handling capacity retransmitted based on CB.
(2) compared with based on CB retransmission schemes, based on TB/CB mixing retransmission scheme, performance is omited only in the case of low signal-to-noise ratio
It is inferior, but with the increase of signal to noise ratio, their throughput performance curve is completely superposed.And re-transmission side is mixed based on TB/CB
Formula can be first than based on TB retransmission schemes, with CB retransmission scheme throughput performance curve co-insides.
Because wireless communication system typically requires that the bit error rate is less than 10-1, namely the requirement under conditions of MCS2 and MCS6
Signal to noise ratio is not less than 2dB and 8dB, so also it shows that being based on TB/CB mixing retransmission schemes, is hardly losing throughput performance
On the premise of, feedback overhead can be effectively reduced, system resource is saved.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the scope of the present invention.It is all
Within the spirit and principles in the present invention, any modification, equivalent substitution and improvements made etc. should be included in the protection of the present invention
Within the scope of.
Claims (3)
1. a kind of mix the method retransmitted, it is characterised in that methods described includes：
The code block number malfunctioned after statistics previous transmission and the code block number malfunctioned after this transmission；
According to the code block number that malfunctions after this transmission and the ratio of the code block number malfunctioned after previous transmission, and default cut
Threshold value is changed, transmission next time selection code block CB is retransmitted or transmission block TB is retransmitted, and the handoff threshold value is more than 0 and less than or equal to 1；
Wherein, the ratio according to the code block number malfunctioned after this transmission and the code block number malfunctioned after previous transmission, with
And default handoff threshold value, transmission next time selection code block CB is retransmitted or transmission block TB re-transmissions include：
If the ratio of code block number of the code block number malfunctioned after this transmission with being malfunctioned after previous transmission is more than 0 and is less than or equal to
The handoff threshold value, then transmission next time selection CB re-transmissions；
If the ratio of code block number of the code block number malfunctioned after this transmission with being malfunctioned after previous transmission is more than the switching door
Limit value and less than or equal to 1, then transmission next time selection TB is retransmitted.
2. mixing the method for re-transmission according to claim 1, it is characterised in that when transmitting first, go out after the previous transmission
Wrong code block number is equal to the number for transmitting CB first.
3. the method for re-transmission is mixed according to claim 1, it is characterised in that the default handoff threshold value is equal to 0.5.
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| CN104283651B true CN104283651B (en) | 2017-08-29 |
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Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US10270579B2 (en) * | 2015-02-05 | 2019-04-23 | Qualcomm Incorporated | Efficient ACK/NACK transmission |
| US11528096B2 (en) * | 2016-06-20 | 2022-12-13 | Ntt Docomo, Inc. | User terminal and radio communication method |
| CA3041977A1 (en) * | 2016-10-28 | 2018-05-03 | Ntt Docomo, Inc. | User terminal and radio communication method |
| KR102327447B1 (en) | 2017-01-04 | 2021-11-17 | 아이디에이씨 홀딩스, 인크. | Receiver feedback in wireless systems |
| CN108289011B (en) | 2017-01-07 | 2023-11-21 | 华为技术有限公司 | Data transmission method and device |
| KR102248077B1 (en) | 2017-01-15 | 2021-05-04 | 엘지전자 주식회사 | In a wireless communication system, a method for transmitting a HARQ-ACK signal and an apparatus therefor |
| CN108347311B (en) | 2017-01-25 | 2021-05-11 | 华为技术有限公司 | Method for sending and receiving feedback information, access network equipment and terminal equipment |
| CN110392993B (en) | 2017-02-24 | 2021-03-09 | Oppo广东移动通信有限公司 | Method for transmitting feedback information, terminal equipment, network equipment and storage medium |
| CA3064967C (en) | 2017-06-06 | 2023-03-21 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method for data transmission by mapping and related product |
| WO2020029665A1 (en) * | 2018-08-10 | 2020-02-13 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods and devices for transmission of transport block over unlicensed spectrum |
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| CN1946015A (en) * | 2006-09-30 | 2007-04-11 | 华为技术有限公司 | Method for determining re-transmitting data block size and base station, data transmission method |
| CN101485216A (en) * | 2006-05-12 | 2009-07-15 | 松下电器产业株式会社 | Reservation of radio resources for users in a mobile communications system |
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| WO2010005712A1 (en) * | 2008-06-16 | 2010-01-14 | Interdigital Patent Holdings, Inc. | Enhanced hybrid automatic repeat request for long term evolution |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101485216A (en) * | 2006-05-12 | 2009-07-15 | 松下电器产业株式会社 | Reservation of radio resources for users in a mobile communications system |
| CN1946015A (en) * | 2006-09-30 | 2007-04-11 | 华为技术有限公司 | Method for determining re-transmitting data block size and base station, data transmission method |
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