CN104348576B - The determination method and system of MCS grades during descending HARQ is retransmitted - Google Patents
The determination method and system of MCS grades during descending HARQ is retransmitted Download PDFInfo
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- CN104348576B CN104348576B CN201310319960.XA CN201310319960A CN104348576B CN 104348576 B CN104348576 B CN 104348576B CN 201310319960 A CN201310319960 A CN 201310319960A CN 104348576 B CN104348576 B CN 104348576B
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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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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Detection And Prevention Of Errors In Transmission (AREA)
- Communication Control (AREA)
Abstract
The present invention relates to the determination method and system of Modulation and Coding Scheme grade in a kind of request of down mixing self-retransmission, the determination method includes：Receive the feedback that transport block transmission is obtained；The feedback received is judged；And different Modulation and Coding Scheme grades are selected according to different judged results.Method and system is determined by using the Modulation and Coding Scheme grade in the down mixing self-retransmission request disclosed in the embodiment of the present invention, can be according to the different Modulation and Coding Scheme grade of different feedback result dynamic selects, it is to avoid cause network resources waste.
Description
Technical field
The present invention relates to wireless communication technology field, asked in particular to a kind of down mixing self-retransmission
Modulation and Coding Scheme (MCS, Modulation and in (HARQ, Hybrid Automatic Repeat Request)
Coding Scheme) grade determination method and system.
Background technology
In 3GPP agreements, 29 kinds of different data transfers for defining 0~28 grade of serial number in down direction, which are modulated, to be compiled
Code scheme grade IMCS, corresponding to various order of modulation and code rate, when changes in channel conditions, system is needed according to channel
Condition selects different MCS schemes grades to change the influence brought with adaptive channel.When being retransmitted to indicate to occur descending HARQ
The change of modulation system, defines the three-level MCS grades of sequence number 29~31, for 29≤I againMCS≤ 31, transport block size is by upper
The descending control carried in one Physical Downlink Control Channel (PDCCH, Physical Downlink Control Channel)
Information (DCI, Downlink Control Information) determines, i.e., (now 0≤I when with being passed at the beginning of same transmission blockMCS
≤ transport block size 28) is identical, as shown in Table 1.
The PDSCH of table 1 is modulated and transport block size concordance list
Descending HARQ is retransmitted only when consistent with the transport block size of previous transmission, can just have HARQ to merge gain, therefore
And when descending HARQ is retransmitted, to ensure that transport block size is constant as far as possible.
At present, MCS determination method is during descending HARQ is retransmitted：Obtain HARQ in order to ensure transport block size constant and close
And gain, before data is transmitted, the MCS used is predefined, its corresponding grade indicates IMCSIt is consistent with first biography, i.e., 0
≤IMCS≤ 28, otherwise use 29,30, the 31 this re-transmission MCS grades for indicating different adjustment exponent numbers.
As can be seen here, in the descending HARQ of prior art is retransmitted, if MCS uses the side consistent with last selection
Formula, then appear in during data transmission scenarios, channel condition can be continually changing, pre-configured static modulation encoding scheme
Grade in data transmission procedure will not accommodation, therefore business demand can not be adapted to very well.And if it is considered that retransmitting
The channel condition at moment and the situation for using 29,30,31 these three MCS grades, for a transmission block, if last transmission
In occur PDCCH authorize lose or mistake, cause terminal not receive, now, will be unable to obtain correct transport block size,
So can not be correctly decoded, so that follow-up multiple invalid descending HARQ can be caused to retransmit, the wasting of resources is caused.
The content of the invention
The technical problems to be solved by the invention cause follow-up repeatedly invalid when being and just passing PDCCH mandates loss or mistake
Descending HARQ the problem of retransmit.
For this purpose, the present invention proposes a kind of determination of Modulation and Coding Scheme grade in down mixing self-retransmission request
Method, including：Receive the feedback that transport block transmission is obtained；The feedback received is judged；And according to different judgements
As a result different Modulation and Coding Scheme grades are selected.
Preferably, it is described to select different Modulation and Coding Scheme grades to include according to different judged results：When judgement connects
When receiving NACK feedbacks, corresponding modulation system is determined according to current channel quality, adjusted using the modulation system is corresponding
Exponent number processed come determine use 29-31 in Modulation and Coding Scheme grade.
Preferably, it is described to select different Modulation and Coding Scheme grades to include according to different judged results：When judge not
When receiving any feedback, identical Modulation and Coding Scheme grade is selected using with the last time.
Preferably, above-mentioned determination method also includes：The transmission is retransmitted according to the Modulation and Coding Scheme grade currently selected
Block.
Preferably, when judging to receive ACK feedbacks, the above method also includes：Discharge the corresponding down mixing certainly
Dynamic repeat request process.
The invention also provides the determination system of Modulation and Coding Scheme grade in a kind of request of down mixing self-retransmission, bag
Include：Feedback reception module, for receiving the feedback that transport block transmission is obtained；Judge module, for the feedback reception module
The feedback received is judged；And selecting module, selected for the judged result according to the judge module different
Modulation and Coding Scheme grade.
Preferably, when the judge module judge the feedback reception module receive feedback be NACK feedback when, it is described
Selecting module determines corresponding modulation system according to current channel quality, using the corresponding order of modulation of the modulation system come
It is determined that using the Modulation and Coding Scheme grade in 29-31.
Preferably, when the judge module judges that the feedback reception module does not receive any feedback, the selection
Module is used and last time selection identical Modulation and Coding Scheme grade.
Preferably, above-mentioned determination system also includes：Retransmission module, for according to Modulation and Coding Scheme currently selected etc.
Level retransmits the transmission block.
Preferably, when the judge module judge the feedback reception module receive feedback be ACK feedback when, it is described really
Determine system and discharge the corresponding down mixing self-retransmission request process.
It can be carried out not according to different feedback results by using determination method disclosed in this invention and determining module
Same Modulation and Coding Scheme hierarchical selection, that is to say, that Modulation and Coding Scheme grade is not pre-configured, but in number
According to the adjustment of feedback result dynamic realtime during according to transmission, it is continually changing therefore, it is possible to more preferable adaptive channel condition
Transmission situation, it is to avoid cause network resources waste.
Brief description of the drawings
The features and advantages of the present invention can be more clearly understood from by reference to accompanying drawing, accompanying drawing is schematical and do not understood
To carry out any limitation to the present invention, in the accompanying drawings：
Fig. 1 shows that Modulation and Coding Scheme grade is really in down mixing self-retransmission request according to embodiments of the present invention
Determine method flow diagram；And
Fig. 2 shows that the Modulation and Coding Scheme grade in down mixing self-retransmission request according to embodiments of the present invention is true
The schematic diagram of cover half block.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the present invention is described in detail.
Fig. 1 shows that Modulation and Coding Scheme grade is really in down mixing self-retransmission request according to embodiments of the present invention
Determine method flow diagram.
As shown in figure 1, first, base station side receives the ACK/NACK feedbacks that the transmission of transmission block last time is obtained；Then, to institute
The feedback of reception is judged；Finally, different Modulation and Coding Scheme grades are selected according to different judged results.
Specifically, when judging that base station side receives NACK feedbacks, corresponding adjust is determined according to current channel quality
Mode processed, determines to use the Modulation and Coding Scheme grade in 29-31, then basis using the corresponding order of modulation of modulation system
Identified Modulation and Coding Scheme grade retransmits the transmission block.
When judging that base station side does not receive any feedback, then use with last time selection identical MCS grades to perform down
Row HARQ is retransmitted.
When judging that base station side receives ACK feedbacks, then corresponding descending HARQ retransmission process is discharged.
By such scheme, according to real-time feedback result, it is continually changing according to channel condition in data transmission procedure,
Modulation and Coding Scheme grade is adjusted in real time, so as to avoid causing network resources waste.
Fig. 2 shows that the Modulation and Coding Scheme grade in down mixing self-retransmission request according to embodiments of the present invention is true
Determine the schematic diagram of system.
As shown in Fig. 2 Modulation and Coding Scheme grade determines that system includes feedback reception module 21, judge module 22 and selection
Module 23.Wherein, feedback reception module 21 is used to receive the feedback that transport block transmission is obtained；Judge module 22 is used to connect feedback
The feedback that receipts module 21 is received is judged；And selecting module 23 is used to be selected according to the judged result of judge module 22
Different Modulation and Coding Scheme grades.
Specifically, when judge module 22 judge feedback reception module 21 receive feedback be NACK feedback when, select mould
Block 23 determines corresponding modulation system according to current channel quality, determines to make using the corresponding order of modulation of the modulation system
With the Modulation and Coding Scheme grade in 29-31.
When judge module 22 judges that feedback reception module 21 does not receive any feedback, selecting module 23 is used and upper one
Secondary selection identical Modulation and Coding Scheme grade.
Preferably, the determination system also includes retransmission module 24, for according to the Modulation and Coding Scheme grade currently selected
Retransmit the transmission block.
In addition, when judge module 22 judge feedback reception module 21 receive feedback be ACK feedback when, the determination system is released
Put corresponding descending HARQ retransmission process.
By using the Modulation and Coding Scheme grade in the down mixing self-retransmission request disclosed in the embodiment of the present invention
Method and system is determined, can be according to the different Modulation and Coding Scheme grade of different feedback result dynamic selects, it is to avoid cause
Network resources waste.
Although being described in conjunction with the accompanying embodiments of the present invention, those skilled in the art can not depart from this hair
Various modification can be adapted in the case of bright spirit and scope and modification, and such modifications and variations are each fallen within by appended claims
Within limited range.
Claims (8)
1. a kind of determination method of Modulation and Coding Scheme grade in down mixing self-retransmission request, including：
Receive the feedback that transport block transmission is obtained；
The feedback received is judged；And
Different Modulation and Coding Scheme grades are selected according to different judged results；
It is described to select different Modulation and Coding Scheme grades to include according to different judged results：
When judging to receive NACK feedbacks, corresponding modulation system is determined according to current channel quality, the modulation is utilized
The corresponding order of modulation of mode come determine use sequence number 29-31 in Modulation and Coding Scheme grade.
2. determination method according to claim 1, wherein：It is described to select different modulation to compile according to different judged results
Code scheme grade includes：
When judging not receive any feedback, identical Modulation and Coding Scheme grade is selected using with the last time.
3. determination method according to any one of claim 1 to 2, in addition to：
The transmission block is retransmitted according to the Modulation and Coding Scheme grade currently selected.
4. determination method according to any one of claim 1 to 2, wherein：It is described when judging to receive ACK feedbacks
Method also includes：Discharge corresponding down mixing self-retransmission request process.
5. the determination system of Modulation and Coding Scheme grade in a kind of down mixing self-retransmission request, including：
Feedback reception module, for receiving the feedback that transport block transmission is obtained；
Judge module, for judging the feedback that the feedback reception module is received；And
Selecting module, different Modulation and Coding Scheme grades are selected for the judged result according to the judge module；
When the judge module judge the feedback reception module receive feedback be NACK feedback when, the selecting module according to
Current channel quality determines corresponding modulation system, determines to use sequence number using the corresponding order of modulation of the modulation system
Modulation and Coding Scheme grade in 29-31.
6. determination system according to claim 5, wherein：When the judge module judges that the feedback reception module does not connect
When receiving any feedback, the selecting module is used and last time selection identical Modulation and Coding Scheme grade.
7. the determination system according to any one of claim 5 to 6, in addition to：
Retransmission module, for retransmitting the transmission block according to the Modulation and Coding Scheme grade currently selected.
8. the determination system according to any one of claim 5 to 6, wherein：When the judge module judges the feedback
Receiving module receives feedback when being ACK feedbacks, and the determination system discharges corresponding down mixing self-retransmission request process.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310319960.XA CN104348576B (en) | 2013-07-26 | 2013-07-26 | The determination method and system of MCS grades during descending HARQ is retransmitted |
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| CN201310319960.XA CN104348576B (en) | 2013-07-26 | 2013-07-26 | The determination method and system of MCS grades during descending HARQ is retransmitted |
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| CN104348576A CN104348576A (en) | 2015-02-11 |
| CN104348576B true CN104348576B (en) | 2017-11-03 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108023689B (en) | 2016-11-04 | 2020-12-15 | 华为技术有限公司 | Retransmission method and device |
| CN108282257A (en) * | 2017-01-06 | 2018-07-13 | 株式会社Ntt都科摩 | User terminal, feedback method at which, base station and method at which |
| 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 |
| CN111356250B (en) * | 2018-12-20 | 2021-10-26 | 华为技术有限公司 | Method, device and storage medium for scheduling hybrid automatic repeat request process |
| CN113383600B (en) * | 2019-02-15 | 2023-07-18 | 华为技术有限公司 | Data transmission method and data transmission device |
| CN117397188A (en) * | 2021-06-08 | 2024-01-12 | 华为技术有限公司 | Communication method and communication device |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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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| US8386875B2 (en) * | 2009-08-07 | 2013-02-26 | Research In Motion Limited | Method and system for handling HARQ operations during transmission mode changes |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Non-Patent Citations (1)
| Title |
|---|
| Modification of Downlink Asynchronous HARQ scheme;LG Electronics;《3GPP TSG RAN WG1#48,R1-070925》;20070216;第1-5页 * |
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