CN104283651A - Hybrid retransmission method - Google Patents
Hybrid retransmission method Download PDFInfo
- Publication number
- CN104283651A CN104283651A CN201310270829.9A CN201310270829A CN104283651A CN 104283651 A CN104283651 A CN 104283651A CN 201310270829 A CN201310270829 A CN 201310270829A CN 104283651 A CN104283651 A CN 104283651A
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- Prior art keywords
- transmission
- code block
- block number
- makeing mistakes
- threshold value
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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]
Abstract
A hybrid retransmission method comprises the steps of: counting the number of error code blocks after previous transmission and the number of error code blocks after this-time transmission; and according to a ratio between the number of error code blocks after this-time transmission and the number of error code blocks after previous transmission, and a preset switching threshold, selecting code block CB retransmission or transmission block TB retransmission in next-time transmission, wherein the switching threshold is larger than zero and smaller than or equal with one. After the method provided by an embodiment of the invention is applied, under a precondition that system throughput is unchanged, system overhead is reduced, and furthermore system resource is sufficiently used.
Description
Technical field
The application relates to communication technical field, more specifically, relates to a kind of method mixing re-transmission.
Background technology
Hybrid automatic repeat-request (HARQ) technology is the error control method that arq (ARQ) technology and forward error correction (FEC) technology combine.At present, in the HARQ retransmission technique of the wireless communication standards such as LTE, to each user, if just pass mistake, then the transmission block (TB) based on transmission block size is adopted to carry out the re-transmission of data.
Such as, in LTE system, if when the bit number of transmission block TB is greater than full-size 6144 bit of the input bit of the Turbo coding that LTE protocol specifies, then carry out code block (CB) dividing processing to transmission block, and encode (as shown in Figure 1) for each code block be partitioned into is CRC.
In principle, HARQ retransmits both can perform to whole transmission block re-transmissions based on the TB CRC of transmission block, also can transmission block inner with the CB CRC of each code block for foundation, HARQ retransmission process is carried out to the code block CB of generation error of transmission.
See accompanying drawing 2, for the first situation namely based on the retransmission mechanism of TB, only have TB CRC check bit to utilize, produce ACK/NACK identification feedback to transmitting terminal according to unique TB CRC error detection state, then transmitting terminal determines send new data or carry out HARQ re-transmission according to this mark.There is error of transmission in S2 and S4 in first time transmitting procedure, feedback NACK; In second time transmitting procedure there is error of transmission in S4, feedback NACK; Error of transmission is not there is, feeding back ACK for the third time in transmitting procedure.
See accompanying drawing 3, for the second situation namely based on the retransmission mechanism of CB, here because TB length is comparatively large, CB CRC check bit is therefore adopted to produce ACK/NACK mark.Do not have vicious code block owing to may comprise in segmentation code block CB, namely the CRC error detection state of some code block is error-free, can only retransmit the segmentation code block having mistake, is conducive to the burden reducing transmission, adds the throughput of system.There is error of transmission in S2 and S4 in first time transmitting procedure, only feeds back NACK at the CB of S2 and S4; Again transmit S2 and S4 in second time transmitting procedure, due to the CB feeding back ACK of S2, the CB of S4 feeds back NACK; Only again S4 is transmitted, the CB feeding back ACK of S4 for the third time in transmitting procedure.
In HARQ retransmission mechanism, except can adopting the retransmission scheme based on TB, also there is the implementation that some retransmit based on CB code block.Although the throughput of system can be improved significantly based on CB retransmission scheme, considerably increase the expense of system also.
Be not mapped as spatial reuse situation for TB, the transmission block size TBS that LTE standard provides is between 16 ~ 75376 bits, and the number of the code block CB of segmentation is like this between 1 ~ 13.If in first transmission, 13 code blocks are only wrong one, and being one to system resource undoubtedly according to TB re-transmission wastes greatly.If but 13 code blocks only right 1, retransmit according to CB and then promote limited to systematic function, the corresponding expense considerably increasing system.
Be mapped as two-layer spatial reuse situation for TB, the transmission block size TBS that LTE standard provides is between 32 ~ 149776 bits, and the number of the code block CB of segmentation is like this between 1 ~ 25.Same, due to the increase of CB block number, same problem can be given prominence to more with serious.
Therefore, this two kinds of modes are retransmitted for based on TB with based on CB, although the former can bring minimizing of throughput of system, also be minimizing of overhead, the latter can bring the maximization of throughput of system, also namely overhead maximizes, and but all cannot average out between throughput and overhead.
Summary of the invention
The embodiment of the present invention proposes a kind of method mixing re-transmission, under the prerequisite ensureing throughput of system, can reduce overhead, and then make full use of system resource.
The technical scheme of the embodiment of the present invention is as follows:
Mix a method for re-transmission, described method comprises:
The code block number that the code block number of makeing mistakes after statistics previous transmission is made mistakes after transmitting with this;
According to the ratio of the code block number of makeing mistakes after the code block number of makeing mistakes after this transmission and previous transmission, and the handoff threshold value preset, transmission next time selects code block CB to retransmit or transmission block TB retransmits, and described handoff threshold value is greater than 0 and is less than or equal to 1.
The ratio of the described code block number according to makeing mistakes after the code block number of makeing mistakes after this transmission and previous transmission, and the handoff threshold value preset, transmission next time selects code block CB to retransmit or transmission block TB re-transmission comprises:
The ratio of the code block number of makeing mistakes after the code block number of makeing mistakes and previous transmission after this transmission is greater than 0 and is less than or equal to described handoff threshold value, then CB re-transmission is selected in transmission next time.
The ratio of the described code block number according to makeing mistakes after the code block number of makeing mistakes after this transmission and previous transmission, and the handoff threshold value preset, select code block CB to retransmit or transmission block TB re-transmission comprises:
The ratio of the code block number of makeing mistakes after the code block number of makeing mistakes and previous transmission after this transmission is greater than described handoff threshold value and is less than or equal to 1, then TB re-transmission is selected in transmission next time.
When transmitting first, the code block number of makeing mistakes after described previous transmission equals the number transmitting CB first.
Described default handoff threshold value equals 0.5.
As can be seen from technique scheme, the code block number that the code block number of makeing mistakes after adding up previous transmission is in embodiments of the present invention made mistakes after transmitting with this; Then, according to the ratio of the code block number of makeing mistakes after the code block number of makeing mistakes after this transmission and previous transmission, and the handoff threshold value preset, transmission next time selects CB to retransmit or TB retransmits.Under the prerequisite ensureing throughput of system, overhead can be reduced, and then makes full use of system resource like this.
Accompanying drawing explanation
Fig. 1 is the schematic diagram that TB is divided into CB;
Fig. 2 realizes principle schematic based on the HARQ of TB;
Fig. 3 realizes principle schematic based on the HARQ of CB;
Fig. 4 is the method flow schematic diagram that mixing retransmits;
Fig. 5 is HARQ mechanism throughput ratio comparatively schematic diagram under MCS2 condition;
Fig. 6 is HARQ mechanism throughput ratio comparatively schematic diagram under MCS6 condition.
Embodiment
Express clearly clear for making the object, technical solutions and advantages of the present invention, below in conjunction with drawings and the specific embodiments, the present invention is further described in more detail.
In embodiments of the present invention, the code block number according to makeing mistakes determines suitable retransmission scheme, can realize throughput-maximized while, reduce system ACK/NACK feedback and resource indicate control overhead.
See the method flow schematic diagram that accompanying drawing 4 is mixing re-transmissions, specifically comprise the following steps:
The code block number of makeing mistakes after 401, adding up the code block number of makeing mistakes after previous transmission and this transmission.
The code block number that the code block number of makeing mistakes after conventionally adding up previous transmission is made mistakes after transmitting with this.
402, according to the ratio of the code block number of makeing mistakes after the code block number of makeing mistakes after this transmission and previous transmission, and the handoff threshold value preset, transmission next time selects CB to retransmit or TB retransmits
represent the CB block number transmitted first.
code block number wrong after representing transmission first.
represent the code block number that the L time transmission (namely the L-1 time HARQ retransmits) is wrong afterwards.
K is the handoff threshold value that TB and CB retransmits, and choosing of K value both can be determined according to real system environment, also can be fixed as a concrete value in advance, such as 0.5.
L represents the number of transmissions, and value is positive integer, and transmission first adopts TB mode.Transmission first refers to the first time transmission of whole transmission block, needs to transmit whole TB block (all CB blocks namely in TB), and because all CB have been included in TB, therefore transmission first adopts TB transmission to be equal to CB transmission.
Scheme one: if met
0 < K≤1, next time, transmission adopted CB retransmission scheme.
Scheme two: if met
0 < K≤1, next time, transmission adopted TB retransmission scheme.
No matter a () transmits first to be also through after HARQ retransmits, as long as successfully decoded, just the ACK information of feedback 1 bit, stops this HARQ process.
If b code block number that () is made mistakes after transmitting first meets scheme one, then to makeing mistakes in M code block
individual code block feedback
individual NACK bit information, all the other
individual code block feeding back ACK bit information, wherein M is the number of the code block CB of segmentation, and next time, transmission adopted CB retransmission scheme.
If the code block number of loading error occurring meets scheme two first, then feed back the nack message of 1 bit, next time, transmission adopted TB retransmission scheme.
If c the code block number of makeing mistakes after () the L time transmission (i.e. the L-1 time HARQ re-transmission) meets scheme one, then to makeing mistakes in M code block
individual code block feedback
individual NACK bit information, all the other
individual code block feeding back ACK bit information, next time, transmission adopted CB retransmission scheme.
If the code block number of makeing mistakes after the L time transmission (namely the L-1 time HARQ retransmits) meets scheme two, then feed back the nack message of 1 bit, next time, transmission adopted TB retransmission scheme, also namely needed to carry out HARQ re-transmission to whole code blocks of this transmission.
Lower surface analysis technique effect of the present invention
For wireless communication system, in order to meet the performance of link adaptation techniques, General Requirements Block Error Rate is less than 10
-1, otherwise system cannot work.Therefore, in the inventive solutions, for TB retransmission scheme, it is a small probability event, only there will be this retransmission scheme when low signal-to-noise ratio.
With compared with CB retransmission scheme, in once transmitting, only need the nack message of feedback 1 bit based on TB retransmission scheme, and do not rely on the code block number of transmission, therefore save system physical resource.
And TB/CB mixing retransmission scheme in feedback overhead between these two kinds of modes, depend on the probability that code block number and this two kinds of modes occur.The feedback quantity expense of these three kinds of HARQ mechanism is analyzed in table 1.
Table 1
| HARQ retransmission scheme | Probability of occurrence | Feedback quantity (bit number) |
| TB | 1 | 1 |
| CB | 1 | M |
| TB/CB mixes | PA/1-PA | 1×P A+M×(1-P A) |
Citing is below explained: as code block number M=13, the probability P that TB retransmission scheme occurs
awhen=0.6, then the expense based on TB retransmission scheme is 1 bit, and the expense based on CB retransmission scheme is 13 bits, and is 1 × 0.6+13 × 0.4=5.8 bit based on the expense of TB/CB mixing retransmission scheme.
Below provide technical solution of the present invention and TB retransmits and CB retransmits throughput performance comparative analysis, simulated conditions is as shown in table 2.
Table 2
The throughput performance curve that figure 5 provides based on TB, CB, TB/CB retransmission scheme under maximum retransmission N=1, MCS2 condition compares.
The throughput performance curve that accompanying drawing 6 gives based on TB, CB, TB/CB retransmission scheme under maximum retransmission N=1, MCS6 condition compares.Wherein, the handoff threshold value K=0.5 of TB and CB re-transmission.
As can be seen from accompanying drawing 5 and accompanying drawing 6:
(1) with compared with TB retransmission scheme, the throughput performance based on CB retransmission scheme promotes obviously, is inferior to the throughput retransmitted based on CB based on TB/CB mixing retransmission scheme a little.
(2) with compared with CB retransmission scheme, based on TB/CB mixing retransmission scheme only in low signal-to-noise ratio situation performance slightly inferior, but along with the increase of signal to noise ratio, their throughput performance curve overlaps completely.And can first than based on TB retransmission scheme based on TB/CB mixing retransmission scheme, with CB retransmission scheme throughput performance curve co-insides.
Because wireless communication system generally all requires that the error rate is less than 10
-1, also namely under the condition of MCS2 and MCS6, requiring that signal to noise ratio is not less than 2dB and 8dB, because also described herein based on TB/CB mixing retransmission scheme, under the prerequisite of losing throughput performance hardly, effectively can reduce feedback overhead, save system resource.
The above, be only preferred embodiment of the present invention, be not intended to limit protection scope of the present invention.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 (5)
1. mix a method for re-transmission, it is characterized in that, described method comprises:
The code block number that the code block number of makeing mistakes after statistics previous transmission is made mistakes after transmitting with this;
According to the ratio of the code block number of makeing mistakes after the code block number of makeing mistakes after this transmission and previous transmission, and the handoff threshold value preset, transmission next time selects code block CB to retransmit or transmission block TB retransmits, and described handoff threshold value is greater than 0 and is less than or equal to 1.
2. mix the method for re-transmission according to claim 1, it is characterized in that, the ratio of the described code block number according to makeing mistakes after the code block number of makeing mistakes after this transmission and previous transmission, and the handoff threshold value preset, transmission next time selects code block CB to retransmit or transmission block TB re-transmission comprises:
The ratio of the code block number of makeing mistakes after the code block number of makeing mistakes and previous transmission after this transmission is greater than 0 and is less than or equal to described handoff threshold value, then CB re-transmission is selected in transmission next time.
3. mix the method for re-transmission according to claim 1, it is characterized in that, the ratio of the described code block number according to makeing mistakes after the code block number of makeing mistakes after this transmission and previous transmission, and the handoff threshold value preset, select code block CB to retransmit or transmission block TB re-transmission comprises:
The ratio of the code block number of makeing mistakes after the code block number of makeing mistakes and previous transmission after this transmission is greater than described handoff threshold value and is less than or equal to 1, then TB re-transmission is selected in transmission next time.
4. according to Claims 2 or 3, mix the method for re-transmission, it is characterized in that, when transmitting first, the code block number of makeing mistakes after described previous transmission equals the number transmitting CB first.
5. mix the method for re-transmission according to claim 1, it is characterized in that, described default handoff threshold value equals 0.5.
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Cited By (10)
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| JP2018509814A (en) * | 2015-02-05 | 2018-04-05 | クゥアルコム・インコーポレイテッドＱｕａｌｃｏｍｍ Ｉｎｃｏｒｐｏｒａｔｅｄ | Efficient ACK / NACK transmission |
| WO2018127179A1 (en) * | 2017-01-07 | 2018-07-12 | 华为技术有限公司 | Data transmission method and apparatus |
| CN108347311A (en) * | 2017-01-25 | 2018-07-31 | 华为技术有限公司 | Send and receive method, access network equipment and the terminal device of feedback information |
| CN109314607A (en) * | 2016-06-20 | 2019-02-05 | 株式会社Ntt都科摩 | User terminal and wireless communications method |
| CN110114994A (en) * | 2016-10-28 | 2019-08-09 | 株式会社Ntt都科摩 | User terminal and wireless communications method |
| WO2020029665A1 (en) * | 2018-08-10 | 2020-02-13 | Telefonaktiebolaget Lm Ericsson (Publ) | Methods and devices for transmission of transport block over unlicensed spectrum |
| JP2020507239A (en) * | 2017-01-04 | 2020-03-05 | アイディーエーシー ホールディングス インコーポレイテッド | Receiver feedback in wireless systems |
| JP2020507956A (en) * | 2017-01-15 | 2020-03-12 | エルジー エレクトロニクス インコーポレイティド | Method and apparatus for transmitting HARQ-ACK signal in wireless communication system |
| JP2020511823A (en) * | 2017-02-24 | 2020-04-16 | オッポ広東移動通信有限公司Ｇｕａｎｇｄｏｎｇ Ｏｐｐｏ Ｍｏｂｉｌｅ Ｔｅｌｅｃｏｍｍｕｎｉｃａｔｉｏｎｓ Ｃｏｒｐ．， Ｌｔｄ． | Feedback information transmission method, terminal device and network device |
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Cited By (23)
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| JP2018509814A (en) * | 2015-02-05 | 2018-04-05 | クゥアルコム・インコーポレイテッドＱｕａｌｃｏｍｍ Ｉｎｃｏｒｐｏｒａｔｅｄ | Efficient ACK / NACK transmission |
| CN109314607A (en) * | 2016-06-20 | 2019-02-05 | 株式会社Ntt都科摩 | User terminal and wireless communications method |
| CN110114994B (en) * | 2016-10-28 | 2022-04-19 | 株式会社Ntt都科摩 | User terminal and wireless communication method |
| CN110114994A (en) * | 2016-10-28 | 2019-08-09 | 株式会社Ntt都科摩 | User terminal and wireless communications method |
| US11601226B2 (en) | 2017-01-04 | 2023-03-07 | Interdigital Patent Holdings, Inc. | Receiver feedback in wireless systems |
| JP7280187B2 (en) | 2017-01-04 | 2023-05-23 | アイディーエーシー ホールディングス インコーポレイテッド | Receiver feedback in wireless systems |
| JP2020507239A (en) * | 2017-01-04 | 2020-03-05 | アイディーエーシー ホールディングス インコーポレイテッド | Receiver feedback in wireless systems |
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| WO2018127179A1 (en) * | 2017-01-07 | 2018-07-12 | 华为技术有限公司 | Data transmission method and apparatus |
| US11581987B2 (en) | 2017-01-07 | 2023-02-14 | Huawei Technologies Co., Ltd. | Data transmission method and apparatus |
| JP2020507956A (en) * | 2017-01-15 | 2020-03-12 | エルジー エレクトロニクス インコーポレイティド | Method and apparatus for transmitting HARQ-ACK signal in wireless communication system |
| US10958384B2 (en) | 2017-01-15 | 2021-03-23 | Lg Electronics Inc. | Method for transmitting HARQ-ACK signal in wireless communication system, and apparatus therefor |
| CN108347311A (en) * | 2017-01-25 | 2018-07-31 | 华为技术有限公司 | Send and receive method, access network equipment and the terminal device of feedback information |
| US11057180B2 (en) | 2017-01-25 | 2021-07-06 | Huawei Technologies Co., Ltd. | Feedback information sending method, feedback information receiving method, access network device, and terminal |
| WO2018137563A1 (en) * | 2017-01-25 | 2018-08-02 | 华为技术有限公司 | Method for sending and receiving feedback information, access network device and terminal device |
| US11405159B2 (en) | 2017-02-24 | 2022-08-02 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method for transmitting feedback information, terminal device and network device |
| JP2020511823A (en) * | 2017-02-24 | 2020-04-16 | オッポ広東移動通信有限公司Ｇｕａｎｇｄｏｎｇ Ｏｐｐｏ Ｍｏｂｉｌｅ Ｔｅｌｅｃｏｍｍｕｎｉｃａｔｉｏｎｓ Ｃｏｒｐ．， Ｌｔｄ． | Feedback information transmission method, terminal device and network device |
| JP6997203B2 (en) | 2017-02-24 | 2022-01-17 | オッポ広東移動通信有限公司 | Feedback information transmission method, terminal equipment and network equipment |
| CN111106900A (en) * | 2017-06-06 | 2020-05-05 | Oppo广东移动通信有限公司 | Method for realizing data mapping transmission and related product |
| US11387954B2 (en) | 2017-06-06 | 2022-07-12 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method for implementing data mapping and transmission and related product |
| US11153048B2 (en) | 2017-06-06 | 2021-10-19 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method for implementing data mapping and transmission and related product |
| CN111106900B (en) * | 2017-06-06 | 2021-03-05 | Oppo广东移动通信有限公司 | Method for realizing data mapping transmission 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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