CN104348576A - Method for determining MSC grade in downlink HARQ retransmission and system thereof - Google Patents
Method for determining MSC grade in downlink HARQ retransmission and system thereof Download PDFInfo
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- CN104348576A CN104348576A CN201310319960.XA CN201310319960A CN104348576A CN 104348576 A CN104348576 A CN 104348576A CN 201310319960 A CN201310319960 A CN 201310319960A CN 104348576 A CN104348576 A CN 104348576A
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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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- 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
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0072—Error control for data other than payload data, e.g. control data
- H04L1/0073—Special arrangements for feedback channel
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- Detection And Prevention Of Errors In Transmission (AREA)
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Abstract
The present invention relates to a method for determining a modulation and coding scheme grade in a downlink hybrid automatic repeat request and a system thereof. The method comprises the steps of receiving the feedback obtained through the transmission of a transmission block, judging received feedback, and selecting different modulation and coding scheme grades according to different judging results. Through employing the method for determining a modulation and coding scheme grade in the downlink hybrid automatic repeat request and the system disclosed by the embodiment of the invention, different modulation and coding scheme grades can be dynamically selected according to different feedback results, and the waste of network resources is avoided.
Description
Technical field
The present invention relates to wireless communication technology field, specifically, relate to a kind of down mixing self-retransmission request (HARQ, Hybrid Automatic Repeat Request) in the determination method and system of Modulation and Coding Scheme (MCS, Modulation and Coding Scheme) grade.
Background technology
In 3GPP agreement, defining sequence number at down direction is the different transfer of data Modulation and Coding Scheme grade I of 0 ~ 28 grade 29 kinds
mCS, corresponding to various order of modulation and code rate, when changes in channel conditions, system needs to select different MCS scheme grades to change the impact brought with adaptive channel according to channel condition.In order to indicate the change that modulation system when descending HARQ retransmits occurs, in turn define three grades of MCS grades of sequence number 29 ~ 31, for 29≤I
mCS≤ 31, transport block size is by a upper Physical Downlink Control Channel (PDCCH, Physical Downlink Control Channel) in the Downlink Control Information (DCI, Downlink Control Information) that carries determine, (now 0≤I when namely just passing with same transmission block
mCS≤ 28) transport block size is identical, as shown in Table 1.
Table 1PDSCH modulation and transport block size concordance list
Descending HARQ retransmits only when consistent with the transport block size of previous transmission, and HARQ just can be had to merge gain, so when descending HARQ retransmits, will ensure that transport block size is constant as far as possible.
At present, during descending HARQ retransmits, the defining method of MCS is: obtain HARQ in order to ensure transport block size constant and merge gain, before data is transmitted, pre-determines the MCS used, the grade instruction I of its correspondence
mCSwith just biography is consistent, i.e. 0≤I
mCS≤ 28, or the re-transmission MCS grade using 29,30,31 this instruction different adjustment exponent number.
As can be seen here, in the descending HARQ of prior art retransmits, if MCS adopts select consistent mode with the last time, then appear in data transmission scenarios process, channel condition can constantly change, pre-configured static modulation encoding scheme grade can not accommodation in data transmission procedure, therefore can not adapt to business demand very well.And if consider the channel condition of retransmission time and use the situation of 29,30,31 these three kinds of MCS grades, for a transmission block, if occur in last transmission that PDCCH authorizes to lose or mistake, terminal is caused not receive, now, correct transport block size cannot be obtained, so cannot be correctly decoded, thus follow-up repeatedly invalid descending HARQ can be caused to retransmit, cause the wasting of resources.
Summary of the invention
Technical problem to be solved by this invention just passes PDCCH to authorize the problem causing follow-up repeatedly invalid descending HARQ to retransmit when loss or mistake.
For this purpose, the present invention proposes the defining method of Modulation and Coding Scheme grade in a kind of down mixing self-retransmission request, comprising: receive the feedback that transport block transmission obtains; Received feedback is judged; And select different Modulation and Coding Scheme grades according to different judged results.
Preferably, describedly different Modulation and Coding Scheme grades is selected to comprise according to different judged results: when judging to receive NACK feedback, determine corresponding modulation system according to current channel quality, utilize order of modulation corresponding to described modulation system to determine to use the Modulation and Coding Scheme grade in 29-31.
Preferably, describedly selecting different Modulation and Coding Scheme grades to comprise according to different judged results: when judging not receive any feedback, using and selecting identical Modulation and Coding Scheme grade with last.
Preferably, above-mentioned defining method also comprises: the Modulation and Coding Scheme grade according to current selection retransmits described transmission block.
Preferably, when judging to receive ACK feedback, said method also comprises: the described down mixing self-retransmission request process that release is corresponding.
The invention allows for the certainty annuity of Modulation and Coding Scheme grade in a kind of down mixing self-retransmission request, comprising: feedback receive module, for receiving the feedback that transport block transmission obtains; Judge module, judges for the feedback received described feedback receive module; And selection module, for selecting different Modulation and Coding Scheme grades according to the judged result of described judge module.
Preferably, when described judge module judge described feedback receive module receive feedback be NACK feedback time, described selection module determines corresponding modulation system according to current channel quality, utilizes order of modulation corresponding to described modulation system to determine to use the Modulation and Coding Scheme grade in 29-31.
Preferably, when described judge module judges that described feedback receive module does not receive any feedback, described selection module uses selects identical Modulation and Coding Scheme grade with the last time.
Preferably, above-mentioned certainty annuity also comprises: retransmission module, retransmits described transmission block for the Modulation and Coding Scheme grade according to current selection.
Preferably, when described judge module judges described feedback receive module to receive feedback is ACK feedback, the described down mixing self-retransmission request process that the release of described certainty annuity is corresponding.
Different Modulation and Coding Scheme hierarchical selection can be carried out according to different feedback result by adopting defining method disclosed in this invention and determination module, that is, Modulation and Coding Scheme grade is not pre-configured, but according to the adjustment of feedback result dynamic realtime in the process of transfer of data, therefore, can the better transmission situation that constantly changes of adaptive channel condition, avoid causing network resources waste.
Accompanying drawing explanation
Can understanding the features and advantages of the present invention clearly by reference to accompanying drawing, accompanying drawing is schematic and be not understood to carry out any restriction to the present invention, in the accompanying drawings:
Fig. 1 shows the determination method flow diagram of Modulation and Coding Scheme grade in the down mixing self-retransmission request according to the embodiment of the present invention; And
Fig. 2 shows the schematic diagram according to the Modulation and Coding Scheme level determination module in the down mixing self-retransmission request of the embodiment of the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the present invention is described in detail.
Fig. 1 shows the determination method flow diagram of Modulation and Coding Scheme grade in the down mixing self-retransmission request according to the embodiment of the present invention.
As shown in Figure 1, first, base station side receives the ACK/NACK feedback that the transmission of transmission block last time obtains; Then, received feedback is judged; Finally, different Modulation and Coding Scheme grades is selected according to different judged results.
Specifically, when judging that base station side receives NACK feedback, corresponding modulation system is determined according to current channel quality, the order of modulation utilizing modulation system corresponding is determined to use the Modulation and Coding Scheme grade in 29-31, then retransmits this transmission block according to determined Modulation and Coding Scheme grade.
When judging that base station side does not receive any feedback, then use and select identical MCS grade to perform descending HARQ to retransmit with last.
When judging that base station side receives ACK feedback, then discharge corresponding descending HARQ retransmission process.
By such scheme, according to real-time feedback result, according to the continuous change of channel condition in data transmission procedure, adjust Modulation and Coding Scheme grade in real time, thus avoid causing network resources waste.
Fig. 2 shows the schematic diagram according to the Modulation and Coding Scheme grade certainty annuity in the down mixing self-retransmission request of the embodiment of the present invention.
As shown in Figure 2, Modulation and Coding Scheme grade certainty annuity comprises feedback receive module 21, judge module 22 and selects module 23.Wherein, the feedback that obtains for receiving transport block transmission of feedback receive module 21; Judge module 22 judges for the feedback received feedback receive module 21; And select module 23 for selecting different Modulation and Coding Scheme grades according to the judged result of judge module 22.
Specifically, when judge module 22 judge feedback receive module 21 receive feedback be NACK feedback time, select module 23 to determine corresponding modulation system according to current channel quality, utilize order of modulation corresponding to this modulation system to determine to use the Modulation and Coding Scheme grade in 29-31.
When judge module 22 judges that feedback receive module 21 does not receive any feedback, select module 23 to use and select identical Modulation and Coding Scheme grade with the last time.
Preferably, this certainty annuity also comprises retransmission module 24, retransmits described transmission block for the Modulation and Coding Scheme grade according to current selection.
In addition, when judge module 22 judges feedback receive module 21 to receive feedback is ACK feedback, the descending HARQ retransmission process that the release of this certainty annuity is corresponding.
By the Modulation and Coding Scheme grade defining method in the down mixing self-retransmission request disclosed in the employing embodiment of the present invention and system, Modulation and Coding Scheme grade that can be different according to different feedback result Dynamic Selection, avoids causing network resources waste.
Although describe embodiments of the present invention by reference to the accompanying drawings, but those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, such amendment and modification all fall into by within claims limited range.
Claims (10)
1. the defining method of Modulation and Coding Scheme grade in down mixing self-retransmission request, comprising:
Receive the feedback that transport block transmission obtains;
Received feedback is judged; And
Different Modulation and Coding Scheme grades is selected according to different judged results.
2. defining method according to claim 1, wherein: describedly select different Modulation and Coding Scheme grades to comprise according to different judged results:
When judging to receive NACK feedback, determining corresponding modulation system according to current channel quality, utilizing order of modulation corresponding to described modulation system to determine to use the Modulation and Coding Scheme grade in 29-31.
3. defining method according to claim 1, wherein: describedly select different Modulation and Coding Scheme grades to comprise according to different judged results:
When judging not receive any feedback, using and selecting identical Modulation and Coding Scheme grade with the last time.
4. defining method according to any one of claim 1 to 3, also comprises:
Modulation and Coding Scheme grade according to current selection retransmits described transmission block.
5. defining method according to any one of claim 1 to 3, wherein: when judging to receive ACK feedback, described method also comprises: the described down mixing self-retransmission request process that release is corresponding.
6. the certainty annuity of Modulation and Coding Scheme grade in down mixing self-retransmission request, comprising:
Feedback receive module, for receiving the feedback that transport block transmission obtains;
Judge module, judges for the feedback received described feedback receive module; And
Select module, for selecting different Modulation and Coding Scheme grades according to the judged result of described judge module.
7. certainty annuity according to claim 6, wherein: when described judge module judge described feedback receive module receive feedback be NACK feedback time, described selection module determines corresponding modulation system according to current channel quality, utilizes order of modulation corresponding to described modulation system to determine to use the Modulation and Coding Scheme grade in 29-31.
8. certainty annuity according to claim 6, wherein: when described judge module judges that described feedback receive module does not receive any feedback, described selection module uses selects identical Modulation and Coding Scheme grade with the last time.
9. the certainty annuity according to any one of claim 6 to 8, also comprises:
Retransmission module, retransmits described transmission block for the Modulation and Coding Scheme grade according to current selection.
10. the certainty annuity according to any one of claim 6 to 8, wherein: when described judge module judges described feedback receive module to receive feedback be ACK feedback, the described down mixing self-retransmission request process that the release of described certainty annuity is corresponding.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018082679A1 (en) * | 2016-11-04 | 2018-05-11 | 华为技术有限公司 | Re-transmission method and device |
| WO2018127134A1 (en) * | 2017-01-06 | 2018-07-12 | 株式会社Ntt都科摩 | User terminal and feedback method thereof, and base station and method thereof |
| CN109787711A (en) * | 2017-11-15 | 2019-05-21 | 电信科学技术研究院 | A kind of MCS indexed table configuration method, user terminal and network side equipment |
| CN111356250A (en) * | 2018-12-20 | 2020-06-30 | 华为技术有限公司 | Method, device and storage medium for scheduling hybrid automatic repeat request process |
| CN113383600A (en) * | 2019-02-15 | 2021-09-10 | 华为技术有限公司 | Data transmission method and data transmission device |
| WO2022257026A1 (en) * | 2021-06-08 | 2022-12-15 | 华为技术有限公司 | Communication method and communication apparatus |
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| US20110035639A1 (en) * | 2009-08-07 | 2011-02-10 | Research In Motion Limited | Method and system for handling harq operations during transmission mode changes |
| CN102098152A (en) * | 2010-12-30 | 2011-06-15 | 电子科技大学 | Across-carrier retransmission method of HARQ (Hybrid Automatic Repeat Request) based on carrier aggregation |
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| US20110035639A1 (en) * | 2009-08-07 | 2011-02-10 | Research In Motion Limited | Method and system for handling harq operations during transmission mode changes |
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| LG ELECTRONICS: "Modification of Downlink Asynchronous HARQ scheme", 《3GPP TSG RAN WG1#48,R1-070925》 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018082679A1 (en) * | 2016-11-04 | 2018-05-11 | 华为技术有限公司 | Re-transmission method and device |
| US10972232B2 (en) | 2016-11-04 | 2021-04-06 | Huawei Technologies Co., Ltd. | Retransmission method and device |
| WO2018127134A1 (en) * | 2017-01-06 | 2018-07-12 | 株式会社Ntt都科摩 | User terminal and feedback method thereof, and base station and method thereof |
| CN109787711A (en) * | 2017-11-15 | 2019-05-21 | 电信科学技术研究院 | A kind of MCS indexed table configuration method, user terminal and network side equipment |
| CN109787711B (en) * | 2017-11-15 | 2021-08-17 | 大唐移动通信设备有限公司 | MCS index table configuration method, user terminal and network side equipment |
| CN111356250A (en) * | 2018-12-20 | 2020-06-30 | 华为技术有限公司 | Method, device and storage medium for scheduling hybrid automatic repeat request process |
| CN113383600A (en) * | 2019-02-15 | 2021-09-10 | 华为技术有限公司 | Data transmission method and data transmission device |
| CN113383600B (en) * | 2019-02-15 | 2023-07-18 | 华为技术有限公司 | Data transmission method and data transmission device |
| WO2022257026A1 (en) * | 2021-06-08 | 2022-12-15 | 华为技术有限公司 | Communication method and communication apparatus |
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| CN104348576B (en) | 2017-11-03 |
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