CN114050892B - Method for reducing size of uplink HARQ merging buffer space - Google Patents
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- 208000032369 Primary transmission Diseases 0.000 claims abstract description 49
- 230000003139 buffering effect Effects 0.000 claims abstract description 6
- 230000005540 biological transmission Effects 0.000 claims description 20
- 230000011218 segmentation Effects 0.000 claims description 17
- 238000007726 management method Methods 0.000 claims description 6
- 230000003287 optical effect Effects 0.000 claims description 6
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0009—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the channel coding
- H04L1/0013—Rate matching, e.g. puncturing or repetition of code symbols
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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
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0061—Error detection codes
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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
- H04L1/1829—Arrangements specially adapted for the receiver end
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Abstract
The application provides a method for reducing the size of an uplink HARQ merging buffer space, belonging to the field of 5G NR system base station physical layer devices. N calculated as enabling lbrm=1 cb The size, the soft bit of the primary transmission rate matching is moved to DDR from the accelerator for buffering; when in retransmission, a user sends retransmission data according to a CC merging mode that RV=0 and LBRM is not enabled to still be LBRM=0; the base station needs to shift the primary de-rate matching soft bits from DDR to HRAM of the accelerator before decoding the retransmission data, the shift size is calculated by LBRM=1, and N is calculated by LBRM=1 cb Smaller Ncb than lbrm=0 can save limited HRAM space. The 4 retransmissions are accumulated and the buffer space can be saved without losing gain.
Description
Technical Field
The application belongs to the field of a base station physical layer device of a 5G NR system, and particularly relates to a method for reducing the size of an uplink HARQ merging buffer space.
Background
Protocol 38.212 specifies a buffer size N for uplink shared channel HARQ in 5G NR systems cb (circular buffer length) is affected by whether LBRM is enabled or not. When lbrm=0, i.e. unrestricted buffer: n (N) cb =n; when lbrm=1, i.e. limited buffer: n (N) cb ＝min(N，N ref )。Can be pushed out according to the methodWherein C is the number of code blocks, +.>
N is the length of the cb LDPC code; when LDPC base graph=1, the maximum value of N is 3*K, K maximum value 8448 is known, so the maximum value of N is 3×8448=25344; when LDPC base graph=2, the maximum value of N is 5*K, and at this time, the maximum value of K is 3840, so the maximum value of N is 5×3840=19200.
When LDPC base graph=1, the value of C is calculated as follows, c= 630834/((2/3) ×25344) =37, and as can be seen from the above, when the number of code blocks C is greater than 37, the length of the LBRM buffer is smaller than N; when LDPC base graph=2, the value of C is calculated as follows, and c= 630834/((2/3) ×19200) =49, and when the number of code blocks C is greater than 49, the length of the LBRM buffer is smaller than N.
To sum up, when lbrm=1 is enabled, the buffer N can be saved in large code blocks cb But there is no disclosure of saving buffer N when large code blocks cb Is realized by the method.
Disclosure of Invention
In order to overcome the defects in the prior art, the application provides a method for reducing the size of the uplink HARQ merging buffer space.
In order to achieve the above object, the present application provides the following technical solutions:
a method for reducing the size of an uplink HARQ combining buffer space comprises the following steps:
the register of the user initially transmits data according to a CC combining mode of RV=0 and not enabling LBRM=0, and the combined initial transmission data is sent to the base station;
when the base station judges the primary transmission error according to the decoding result of the primary transmission data, the base station stores the soft bit of the rate-resolved matching of the primary transmission data to the accelerator, and the buffer zone N is used when LBRM=1 is enabled cb The de-rate matching soft bits of the primary transmission data are moved from the accelerator to the memory DDR for buffering; otherwise, ending the primary transmission;
the register of the user terminal retransmits the data in a CC combining mode of RV=0 and not enabling LBRM=0, and the combined retransmission data is sent to the base station;
the base station shifts the de-rate matching soft bits of the primary transmission data from the memory DDR to the optical holographic memory HRAM of the accelerator, wherein the shift is of a size of a buffer N when LBRM=1 is enabled cb Is a value of (2); the base station performs rate-de-matching on the retransmission data to obtain rate-de-matching soft bits of the retransmission data, and performs CC combination on the rate-de-matching soft bits of the retransmission data and the rate-de-matching soft bits of the primary transmission data stored in the optical holographic memory HRAM in a mode of enabling LBRM=1 and RV=0;
the base station decodes the combined data, when the base station judges retransmission errors according to the decoding result, the combined data is stored and used as primary transmission data processed by the next base station, the data sent by the next user is used as retransmission data, and the operations of the primary transmission data and the retransmission data are repeated; otherwise, the retransmission is ended.
Preferably, the specific step of storing the de-rate matching soft bits of the primary transmission data to the accelerator includes:
acquiring parameters of transmission block size, code rate, code block segmentation and rate matching;
distributing a group graph to retransmission data according to the transmission block size, the code rate, the code block segmentation and the rate matching parameters, and performing LBRM (location based management method) enabling setting according to the group graph;
LDPC decoding is carried out on the primary transmission data based on LBRM enabling setting conditions;
and judging the CRC check code in the LDPC decoding result, and if the CRC check code is wrong, storing the de-rate matching soft bits of the primary transmission data to an accelerator.
Preferably, the specific step of storing the combined data includes:
acquiring parameters of transmission block size, code rate, code block segmentation and rate matching;
distributing a group graph to retransmission data according to the transmission block size, the code rate, the code block segmentation and the rate matching parameters, and performing LBRM (location based management method) enabling setting according to the group graph;
combining the soft bits of the rate matching of the retransmission data and the soft bits of the rate matching of the primary transmission data based on the LBRM enabling setting condition;
LDPC decoding is carried out on the combined data;
judging the CRC check code in the LDPC decoding result, and ending the retransmission operation if the CRC check code is wrong and the maximum retransmission times are reached; if the CRC check code is wrong but the maximum retransmission times are not reached, the soft ratio of the solution rate matching soft bits of the combined retransmission data and the solution rate matching soft ratio of the primary transmission data is saved.
Preferably, the specific steps of performing LBRM enabling setting according to the group graph include:
when the primary transmission data is distributed to the graph1, judging the number of code blocks;
if the number of code blocks is less than 37, LBRM is set to be disabled, and lbrm=0; if the number of code blocks is greater than 37, LBRM enable is set, and lbrm=1.
Preferably, the method further comprises:
the base station performs IR combining on the data with the number of code blocks smaller than 37 in graph1 in a manner that lbrm=1 is not enabled and RV is freely used.
Preferably, the specific steps of performing LBRM enabling setting according to the group graph include:
when the retransmission data is distributed to the graph2, judging the number of code blocks;
if the number of code blocks is less than 49, LBRM is set to be disabled, and lbrm=0; if the number of code blocks is greater than 49, LBRM enable is set, and lbrm=1.
Preferably, the method further comprises:
the base station performs IR combining on the data with the number of code blocks smaller than 49 in the graph2 in such a way that lbrm=1 is not enabled and RV is freely used.
The method for reducing the size of the uplink HARQ merging buffer space has the following beneficial effects: 1) On the base station side, when LDPC base graph=1 and the number of code blocks C is greater than 37, lbrm=1 buffer N is enabled cb The length is smaller than the length N after cb LDPC encoding; LDPC base graph=2 and code block number C is greater than 49, buffer N cb The length is smaller than the length N after cb LDPC encoding. HARQ buffer space may be saved. 2) On the user UE side, when the code block with high code rate and large code rate is used, the effective soft information length e is smaller than the length N after cb LDPC coding, so the base station uses a buffer zone N smaller than the length N after cb LDPC coding cb The accuracy is not affected by CC merging, and the reliability in the transmission process is increased.
Drawings
In order to more clearly illustrate the embodiments of the present application and the design thereof, the drawings required for the embodiments will be briefly described below. The drawings in the following description are only some of the embodiments of the present application and other drawings may be made by those skilled in the art without the exercise of inventive faculty.
Fig. 1 is a flowchart of a method for reducing the size of an uplink HARQ combining buffer space according to embodiment 1 of the present application;
FIG. 2 is a flow chart of storing the soft bits of the initial data for rate matching to the accelerator according to embodiment 1 of the present application;
fig. 3 is a flowchart of storing retransmission data to an accelerator according to embodiment 1 of the present application.
Detailed Description
The present application will be described in detail below with reference to the drawings and the embodiments, so that those skilled in the art can better understand the technical scheme of the present application and can implement the same. The following examples are only for more clearly illustrating the technical aspects of the present application, and are not intended to limit the scope of the present application.
Example 1
The application provides a method for reducing the size of an uplink HARQ merging buffer space, which is shown in fig. 1 specifically and comprises the following steps: the register of the user initially transmits data according to a CC combining mode of RV=0 and not enabling LBRM=0, and the combined initial transmission data is sent to the base station; when the base station judges the primary transmission error according to the decoding result of the primary transmission data, the base station stores the soft bit of the rate-resolved matching of the primary transmission data to the accelerator, and the buffer zone N is used when LBRM=1 is enabled cb The de-rate matching soft bits of the primary transmission data are moved from the accelerator to the memory DDR for buffering; otherwise, ending the primary transmission; the register of the user terminal retransmits the data in a CC combining mode of RV=0 and not enabling LBRM=0, and the combined retransmission data is sent to the base station; the base station shifts the de-rate matching soft bits of the primary transmission data from the memory DDR to the optical holographic memory HRAM of the accelerator, wherein the shift is of a size of a buffer N when LBRM=1 is enabled cb Is a value of (2); the base station performs rate-de-matching on the retransmission data to obtain rate-de-matching soft bits of the retransmission data, and performs CC combination on the rate-de-matching soft bits of the retransmission data and the rate-de-matching soft bits of the primary transmission data stored in the optical holographic memory HRAM in a mode of enabling LBRM=1 and RV=0; the base station decodes the combined data, when the base station judges retransmission errors according to the decoding result, the combined data is stored and used as primary transmission data processed by the next base station, the data sent by the next user is used as retransmission data, and the operations of the primary transmission data and the retransmission data are repeated; otherwise, the retransmission is ended.
Referring to fig. 2, the specific steps of storing the de-rate matched soft bits of the primary transmission data to the accelerator include: acquiring parameters of transmission block size, code rate, code block segmentation and rate matching; distributing a group graph to retransmission data according to the transmission block size, the code rate, the code block segmentation and the rate matching parameters, and performing LBRM (location based management method) enabling setting according to the group graph; LDPC decoding is carried out on the primary transmission data based on LBRM enabling setting conditions; and judging the CRC check code in the LDPC decoding result, and if the CRC check code is wrong, storing the de-rate matching soft bits of the primary transmission data to an accelerator and storing the soft bits to the accelerator.
The method comprises the specific steps of distributing primary transmission data according to the size of a transmission block, the code rate, the code block segmentation and the rate matching parameters, and performing LBRM enabling setting according to the groups, wherein the specific steps comprise: when the primary transmission data is distributed to the graph1, judging the number of code blocks; if the number of code blocks is less than 37, LBRM is set to be disabled, and lbrm=0; if the number of code blocks is greater than 37, LBRM enable is set, and lbrm=1. The base station performs IR combining on the data with the number of code blocks smaller than 37 in graph1 in a manner that lbrm=1 is not enabled and RV is freely used. When the retransmission data is distributed to the graph2, judging the number of code blocks; if the number of code blocks is less than 49, LBRM is set to be disabled, and lbrm=0; if the number of code blocks is greater than 49, LBRM enable is set, and lbrm=1. The base station performs IR combining on the data with the number of code blocks smaller than 49 in the graph2 in such a way that lbrm=1 is not enabled and RV is freely used.
Referring to fig. 3, the specific steps of storing the merged data include: acquiring parameters of transmission block size, code rate, code block segmentation and rate matching; the specific steps of storing the combined data include: acquiring parameters of transmission block size, code rate, code block segmentation and rate matching; distributing a group graph to retransmission data according to the transmission block size, the code rate, the code block segmentation and the rate matching parameters, and performing LBRM (location based management method) enabling setting according to the group graph; combining the soft bits of the rate matching of the retransmission data and the soft bits of the rate matching of the primary transmission data based on the LBRM enabling setting condition; LDPC decoding is carried out on the combined data; judging the CRC check code in the LDPC decoding result, and ending the retransmission operation if the CRC check code is wrong and the maximum retransmission times are reached; if the CRC check code is wrong but the maximum retransmission times are not reached, the soft ratio of the solution rate matching soft bits of the combined retransmission data and the solution rate matching soft ratio of the primary transmission data is saved.
The method comprises the specific steps of distributing primary transmission data according to the size of a transmission block, the code rate, the code block segmentation and the rate matching parameters, and performing LBRM enabling setting according to the groups, wherein the specific steps comprise: when the primary transmission data is distributed to the graph1, judging the number of code blocks; if the number of code blocks is less than 37, LBRM is set to be disabled, and lbrm=0; if the number of code blocks is greater than 37, LBRM enable is set, and lbrm=1. The base station performs IR combining on the data with the number of code blocks smaller than 37 in graph1 in a manner that lbrm=1 is not enabled and RV is freely used. When the retransmission data is distributed to the graph2, judging the number of code blocks; if the number of code blocks is less than 49, LBRM is set to be disabled, and lbrm=0; if the number of code blocks is greater than 49, LBRM enable is set, and lbrm=1. The base station performs IR combining on the data with the number of code blocks smaller than 49 in the graph2 in such a way that lbrm=1 is not enabled and RV is freely used.
In this embodiment, the advantages of the present application are described by the following operations.
Let tb_size=8712. When lbrm=0 is not enabled, the number of code blocks c=2 can be calculated, and the rate matching result of 2 code blocks e=5184, n cb =n= 13728; when lbrm=1 is enabled, the number of code blocks c=2 can be calculated, and the rate matching results of 2 code blocks e=5184, n=13728, n ref ＝479238，N cb ＝min(N，N ref ) = 13728. It can be seen that LBRM enabled HARQ buffering does not save space when tb_size=8712.
Provided tb_size= 573504. When lbrm=0 is not enabled, the number of code blocks c=69 can be calculated, and the rate matching result e=9072 for the first 24 code blocks and the rate matching result e=9088 for the last 45 code blocks, n cb =n=25344; when lbrm=1 is enabled, the number of code blocks c=69 can be calculated, and the rate matching result e=9072 for the first 24 code blocks, and the rate matching result e=9088 for the last 45 code blocks, n cb ＝min(N，N ref ) = 13890. It can be seen that when tb_size=573504, lbrm is enabled, HARQ buffering saves 25344-13890= 11454 bits, which can save about half the space.
Therefore, for large code blocks, the HARQ buffer size N is relatively large when LBRM is not enabled, N is calculated when lbrm=1 is enabled cb About half less than when LBRM is not enabled, a space saving effect can be achieved. Based on the above, the method for reducing the size of the uplink HARQ merging buffer space provided by the application aims at the initial transmission CRC error of an uplink shared channel, and LDPC basWhen the number C of code blocks is greater than 37,LDPC base graph =2 when e graph=1, and the number C of code blocks is greater than 49, the limited space is used for CC combining, so that space can be saved without losing gain.
The above embodiments are merely preferred embodiments of the present application, the protection scope of the present application is not limited thereto, and any simple changes or equivalent substitutions of technical solutions that can be obviously obtained by those skilled in the art within the technical scope of the present application disclosed herein are all within the protection scope of the present application.
Claims (7)
1. The method for reducing the size of the uplink HARQ merging buffer space is characterized by comprising the following steps:
the register of the user initially transmits data according to a CC combining mode of RV=0 and not enabling LBRM=0, and the combined initial transmission data is sent to the base station;
when the base station judges the primary transmission error according to the decoding result of the primary transmission data, the base station stores the soft bit of the rate-resolved matching of the primary transmission data to the accelerator, and the buffer zone N is used when LBRM=1 is enabled cb The de-rate matching soft bits of the primary transmission data are moved from the accelerator to the memory DDR for buffering; otherwise, ending the primary transmission, the N cb Circular buffer length;
the register of the user terminal retransmits the data in a CC combining mode of RV=0 and not enabling LBRM=0, and the combined retransmission data is sent to the base station;
the base station shifts the de-rate matching soft bits of the primary transmission data from the memory DDR to the optical holographic memory HRAM of the accelerator, wherein the shift is of a size of a buffer N when LBRM=1 is enabled cb Is a value of (2); the base station performs rate-de-matching on the retransmission data to obtain rate-de-matching soft bits of the retransmission data, and performs CC combination on the rate-de-matching soft bits of the retransmission data and the rate-de-matching soft bits of the primary transmission data stored in the optical holographic memory HRAM in a mode of enabling LBRM=1 and RV=0;
the base station decodes the combined data, when the base station judges retransmission errors according to the decoding result, the combined data is stored and used as primary transmission data processed by the next base station, the data sent by the next user is used as retransmission data, and the operations of the primary transmission data and the retransmission data are repeated; otherwise, the retransmission is ended.
2. The method for reducing the size of the uplink HARQ combining buffer space according to claim 1, wherein the specific step of storing the de-rate matched soft bits of the primary transmission data to the accelerator includes:
acquiring parameters of transmission block size, code rate, code block segmentation and rate matching;
distributing a group graph to retransmission data according to the transmission block size, the code rate, the code block segmentation and the rate matching parameters, and performing LBRM (location based management method) enabling setting according to the group graph;
LDPC decoding is carried out on the primary transmission data based on LBRM enabling setting conditions;
and judging the CRC check code in the LDPC decoding result, and if the CRC check code is wrong, storing the de-rate matching soft bits of the primary transmission data to an accelerator.
3. The method for reducing the size of the uplink HARQ combining buffer according to claim 1, wherein the specific step of storing the combined data includes:
acquiring parameters of transmission block size, code rate, code block segmentation and rate matching;
distributing a group graph to retransmission data according to the transmission block size, the code rate, the code block segmentation and the rate matching parameters, and performing LBRM (location based management method) enabling setting according to the group graph;
combining the soft bits of the rate matching of the retransmission data and the soft bits of the rate matching of the primary transmission data based on the LBRM enabling setting condition;
LDPC decoding is carried out on the combined data;
judging the CRC check code in the LDPC decoding result, and ending the retransmission operation if the CRC check code is wrong and the maximum retransmission times are reached; if the CRC check code is wrong but the maximum retransmission times are not reached, the soft ratio of the solution rate matching soft bits of the combined retransmission data and the solution rate matching soft ratio of the primary transmission data is saved.
4. A method for reducing the size of an uplink HARQ combining buffer space according to claim 2 or 3, wherein the specific steps of allocating a retransmission data group graph according to the transport block size, the code rate, the code block segmentation and the rate matching parameters, and performing LBRM enabling setting according to the group graph include:
when the primary transmission data is distributed to the graph1, judging the number of code blocks;
if the number of code blocks is less than 37, LBRM is set to be disabled, and lbrm=0; if the number of code blocks is greater than 37, LBRM enable is set, and lbrm=1.
5. The method for reducing the size of an uplink HARQ combining buffer space of claim 4, further comprising:
the base station performs IR combining on the data with the number of code blocks smaller than 37 in graph1 in a manner that lbrm=1 is not enabled and RV is freely used.
6. A method for reducing the size of an uplink HARQ combining buffer space according to claim 2 or 3, wherein the specific steps of allocating a retransmission data group graph according to the transport block size, the code rate, the code block segmentation and the rate matching parameters, and performing LBRM enabling setting according to the group graph include:
when the retransmission data is distributed to the graph2, judging the number of code blocks;
if the number of code blocks is less than 49, LBRM is set to be disabled, and lbrm=0; if the number of code blocks is greater than 49, LBRM enable is set, and lbrm=1.
7. The method for reducing the size of an uplink HARQ combining buffer space of claim 6, further comprising:
the base station performs IR combining on the data with the number of code blocks smaller than 49 in the graph2 in such a way that lbrm=1 is not enabled and RV is freely used.
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