CN112769527B - HARQ-ACK feedback method, device and terminal based on code block group - Google Patents
HARQ-ACK feedback method, device and terminal based on code block group Download PDFInfo
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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
- H04L1/12—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
- H04L1/1858—Transmission or retransmission of more than one copy of acknowledgement message
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
- H04L5/0055—Physical resource allocation for ACK/NACK
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Abstract
The invention discloses a HARQ-ACK feedback method, a device and a terminal based on a code block group, wherein the method comprises the following steps: receiving a target transmission block sent by a sending end, demodulating code blocks in the target transmission block, and determining the demodulation result of each code block in the target transmission block; dividing the code blocks in the target transmission block into at least one target code block group according to the number of the code blocks in the target transmission block and a demodulation result, wherein each target code block group comprises at least one code block; and feeding back retransmission information of the target transmission block to the sending end according to the demodulation result of the code blocks contained in the at least one target code block group. The invention can save the uplink signaling overhead in the communication process.
Description
Technical Field
The present invention relates to the field of network communication technologies, and in particular, to a HARQ-ACK feedback method, apparatus, and terminal based on a code block group.
Background
In the data transmission process of wireless communication, a HARQ-ACK (Hybrid automatic repeat request Acknowledgement) feedback technique is generally used for feeding back whether a receiving end correctly receives data of a transmitting end in downlink transmission, where the HARQ-ACK includes an Acknowledgement (ACK) and a Negative Acknowledgement (NACK), the ACK identifies that the data is correctly received, and the NACK indicates that the data is incorrectly received or not received. In the prior art, HARQ-ACK feedback is performed by taking a Transport Block (TB) as a unit, and only one CB (Code Block) has an error, a transmitting end needs to retransmit the entire TB, so that a lot of uplink ACKs/NAKs need to be fed back, which causes a very large overhead of uplink signaling and waste of resources.
Thus, there is a need for improvements and enhancements in the art.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a method, a device and a terminal for HARQ-ACK feedback based on a code block group, and aims to solve the problem that uplink signaling overhead is high during HARQ-ACK feedback in the prior art.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
in a first aspect of the present invention, a method for HARQ-ACK feedback based on a code block group is provided, where the method includes:
receiving a target transmission block sent by a sending end, demodulating code blocks in the target transmission block, and determining the demodulation result of each code block in the target transmission block;
dividing the code blocks in the target transmission block into at least one target code block group according to the number of the code blocks in the target transmission block and a demodulation result, wherein each target code block group comprises at least one code block;
feeding back retransmission information of the target transmission block to the sending end according to the demodulation result of the code blocks contained in the at least one target code block group;
the retransmission information of the target transmission block includes the number indication information of the target code block groups and the retransmission indication information of each target code block group, the number indication information is used for indicating the number of the target code block groups, and the retransmission indication information is used for indicating whether the target code block groups need to be retransmitted or not.
The HARQ-ACK feedback method based on a code block group, wherein the dividing the code blocks in the target transport block into at least one target code block group according to the number of the code blocks in the target transport block and a demodulation result includes:
acquiring the number candidate values of the code block groups in the target transmission block;
determining retransmission data of the target transmission block when the target transmission block is divided according to the number candidate values respectively, wherein the retransmission data of the target transmission block comprises the total number of code blocks in a code block group which needs to be retransmitted in the target transmission block;
and determining the number of the target code block groups and the code block number in each target code block group according to the retransmission data of the target transmission block corresponding to each number candidate value.
The HARQ-ACK feedback method based on a code block group, wherein the determining retransmission data of the target transport block when the target transport block is divided according to each of the number candidate values respectively includes:
for each of the quantity candidates:
determining the number of code blocks included in each code block group when the target transport block is divided according to the number candidate value;
determining whether each code block group needs to be retransmitted according to the demodulation result of the code blocks in each code block group;
and acquiring the total number of code blocks in all code block groups needing to be retransmitted in each code block group.
The HARQ-ACK feedback method based on a code block group, wherein the determining the number of code blocks included in each code block group when the target transport block is divided according to the number candidate value includes:
determining that the number of code block groups is equal to the number candidate value when the number candidate value is less than the number of code blocks in the target transport block;
if the number of code blocks in the target transport block is an integer multiple of the number candidate value, determining that the number of code blocks in each code block group is X, where X is C/N, C is the number of code blocks in the target transport block, and N is the number candidate value.
The HARQ-ACK feedback method based on a code block group, wherein the determining the number of code blocks included in each code block group when the target transport block is divided according to the number candidate value includes:
determining that the number of code block groups is equal to the number candidate value when the number candidate value is less than the number of code blocks in the target transport block;
if the number of the code blocks in the target transmission block is not an integer multiple of the number candidate value, obtaining a remainder M1 obtained by dividing the number of the code blocks in the target transmission block by the number candidate value;
determining that each code block group in the first M1 code block groups comprises the code block number of K1, each code block group in the last N-M1 code block groups comprises the code block number of K2,
c is the number of code blocks in the target transport block, N isThe quantity candidate.
The HARQ-ACK feedback method based on a code block group, wherein the determining the number of code blocks included in each code block group when the target transport block is divided according to the number candidate value includes:
when the number candidate is greater than or equal to the number of code blocks in the target transport block:
determining that the number of code block groups is equal to the number of code blocks in the target transport block, each code block group including one code block.
The method for feeding back HARQ-ACK based on a code block group, where the determining the number of the target code block group and the number of code blocks in each target code block group according to the retransmission data of the target transport block corresponding to each number candidate value includes:
acquiring a target ratio corresponding to each quantity candidate value, wherein the target ratio is the ratio of the total number of code blocks of which the demodulation result is NACK to the total number of code blocks contained in a code block group which needs to be retransmitted and corresponds to the quantity candidate value;
determining a target quantity candidate value in each quantity candidate value according to the target ratio;
and taking the number of code block groups when the target transmission block is divided according to the target number candidate value as the number of the target code block groups, and taking the number of code blocks in each code block group when the target transmission block is divided according to the target number candidate value as the number of code blocks in each target code block group.
In a second aspect of the present invention, an apparatus for HARQ-ACK feedback based on a code block group is provided, the apparatus comprising:
the demodulation module is used for receiving a target transmission block sent by a base station, demodulating code blocks in the target transmission block and determining the demodulation result of each code block in the target transmission block;
a code block group dividing module, configured to divide the code blocks in the target transport block into at least one target code block group according to the number of code blocks in the target transport block and a demodulation result, where each target code block group includes at least one code block;
a feedback module, configured to feed back retransmission information of the target transport block to a base station according to a demodulation result of a code block included in the at least one target code block group;
the retransmission information of the target transmission block includes the number of the target code block groups and retransmission indication information of each target code block group, and the retransmission indication information is used for indicating whether the code block groups need to be retransmitted or not.
In a third aspect of the present invention, a terminal is provided, where the terminal includes a processor, and a storage medium communicatively connected to the processor, where the storage medium is adapted to store a plurality of instructions, and the processor is adapted to call the instructions in the storage medium to perform the steps of implementing any one of the foregoing methods for HARQ-ACK feedback based on a code block group.
In a fourth aspect of the present invention, there is provided a computer readable storage medium storing one or more programs, which are executable by one or more processors, to implement the steps of the method for codeword block group based HARQ-ACK feedback as described in any one of the above.
Compared with the prior art, the invention provides a code block group-based HARQ-ACK feedback method, a device and a terminal, after a target transmission block sent by a sending end is received, the code blocks in the target transmission block are divided into at least one target code block group according to the number of the code blocks in the target transmission block and a demodulation result, the code block groups needing to be retransmitted in the target transmission block are fed back to the sending end, whether each code block in the target transmission block needs to be retransmitted or not is not required to be fed back to the sending end one by one, and uplink signaling overhead is saved.
Drawings
Fig. 1 is a flowchart of an embodiment of a method for HARQ-ACK feedback based on a code block group according to the present invention;
fig. 2 is a first schematic diagram illustrating retransmission information of a target transport block corresponding to a candidate value of the number of code block groups in an embodiment of a code block group-based HARQ-ACK feedback method according to the present invention;
fig. 3 is a second schematic diagram illustrating retransmission information of a target transport block corresponding to a candidate value of the number of code block groups in an embodiment of a code block group-based HARQ-ACK feedback method according to the present invention;
fig. 4 is a third schematic diagram illustrating retransmission information of a target transport block corresponding to a candidate value of the number of code block groups in an embodiment of a code block group-based HARQ-ACK feedback method provided in the present invention;
fig. 5 is a fourth schematic diagram illustrating retransmission information of a target transport block corresponding to a candidate value of the number of code block groups in an embodiment of a method for HARQ-ACK feedback based on code block groups according to the present invention;
fig. 6 is a fifth schematic diagram illustrating retransmission information of a target transport block corresponding to a candidate value of the number of code block groups in an embodiment of a method for HARQ-ACK feedback based on code block groups according to the present invention;
fig. 7 is a sixth schematic diagram illustrating retransmission information of a target transport block corresponding to a candidate value of the number of code block groups in an embodiment of a method for HARQ-ACK feedback based on code block groups according to the present invention;
fig. 8 is a seventh schematic diagram illustrating retransmission information of a target transport block corresponding to a candidate value of the number of code block groups in an embodiment of a code block group-based HARQ-ACK feedback method according to the present invention;
fig. 9 is an eighth schematic diagram illustrating retransmission information of a target transport block corresponding to a candidate value of the number of code block groups in an embodiment of a method for HARQ-ACK feedback based on code block groups according to the present invention;
fig. 10 is a schematic structural diagram of a HARQ-ACK feedback apparatus based on a code block group according to the present invention;
fig. 11 is a schematic diagram illustrating an embodiment of a terminal according to the present invention.
Detailed Description
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example one
The HARQ-ACK feedback method based on the code block group is executed by a receiving end for transmitting data in wireless communication, the receiving end receives the data sent by a sending end, and HARQ-ACK feedback is carried out on the sending end through the HARQ-ACK feedback method based on the code block group. The receiving end may be a user terminal including but not limited to various mobile phones, computers, tablet computers, wearable devices, and the like, and the transmitting end may be a base station.
As shown in fig. 1, in an embodiment of the method for HARQ-ACK feedback based on a code block group, the method includes the steps of:
s100, receiving a target transmission block sent by a sending end, demodulating code blocks in the target transmission block, and determining the demodulation result of each code block in the target transmission block.
The receiving end demodulates the code block in the target transmission block after receiving the target transmission block sent by the sending end, determines that the demodulation result of the code block is NACK when the code block is received incorrectly or not, determines that the demodulation result of the code block is ACK when the code block is received correctly, and needs to receive the code block again when the demodulation result of the code block is NACK.
S200, dividing the code blocks in the target transmission block into at least one target code block group according to the number of the code blocks in the target transmission block and the demodulation result, wherein each target code block group comprises at least one code block.
In the prior art, the retransmission information of the target transport block fed back to the sending end by the receiving end includes whether each code block in the target transport block needs to be retransmitted or not, specifically, it may be correspondingly indicated by "0" or "1" that the retransmission information needs to be retransmitted or not, for example, when the target transport block includes 2 code blocks, a demodulation result of the first code block is NACK, a demodulation result of the second code block is ACK, the receiving end may feed back "01" to the sending end, and after the sending end receives the data, it is determined that the target transport block has not been correctly received, and the target transport block is retransmitted. It is easy to see that according to the feedback method, information indicating whether each code block needs to be retransmitted or not needs to be fed back to the sending end, the uplink signaling overhead is large, and as long as the demodulation result of one code block is NACK, the whole target transport block is retransmitted, which causes great resource waste.
In this embodiment, after demodulating the code blocks in the target transport block, the code blocks in the target transport block are divided into at least one target code block group, and when the demodulation result of the code blocks in the target transport block is NACK, only the target code block group in which the code blocks are located needs to be retransmitted, instead of retransmitting the whole transport block, which can reduce the resource waste of retransmission, and each target code block group includes at least one code block. In a possible implementation manner, the dividing of the code blocks in the target transport block into at least one target code block group may be performed according to a fixed value, for example, it may be preset that the maximum number of the code block groups in each transport block is N, when the number of the code blocks in the transport block is greater than N, the number of the code block groups is equal to the number of the code blocks, each code block group includes one code block, and when the number of the code blocks in the transport block is less than N, the number of the code block groups is N. However, this method of fixing the maximum number of code block groups in each transport block has disadvantages: the number of code blocks in each transport block and the demodulation results of the code blocks are different, and if the maximum value of the number of code block groups in each transport block is set to be too large or too small, the size of DCI (Downlink Control Information) or the resource requirement of retransmission is affected, and if the maximum value is set to be too small, the overhead of uplink signaling is increased, and if the maximum value is set to be too large, many code blocks with ACK demodulation results in retransmitted code block groups may be caused, and the resource occupation of retransmission is increased. Based on this, the present embodiment provides an adaptive target code block group dividing method, which determines the number of target code block groups in a target transport block according to the number of code blocks in the target transport block and a demodulation result of the code blocks, and specifically divides the code blocks in the target transport block into at least one target code block group according to the number of code blocks in the target transport block and the demodulation result, including:
s210, obtaining the number candidate value of the code block group in the target transmission block;
s220, respectively determining retransmission data of the target transmission block when the target transmission block is divided according to the number candidate values, wherein the retransmission data of the target transmission block comprises the total number of code blocks in a code block group needing to be retransmitted in the target transmission block;
and S230, determining the number of the target code block groups and the code block number in each target code block group according to the retransmission data of the target transmission block corresponding to each number candidate value.
In this embodiment, the number candidate values of the number of code block groups in the transport block are preset, for example, the number candidate value set may be {2,4,6,8}, after the target transport block is received and demodulated, retransmission information of the target transport block when code block group division is performed on the target transport block using each number candidate value in the number candidate value set is respectively determined, that is, the total number of code blocks in the code block groups that need to be retransmitted when the target transport block is divided into at least one code block group using each number candidate value is respectively determined, and then how to finally divide the target transport block is determined according to retransmission information of the target transport block corresponding to each number candidate value.
Specifically, when determining the retransmission data of the target transport block when the target transport block is divided according to each number candidate value, the following steps are performed for each number candidate value:
s221, determining the number of code blocks in each code block group when the target transmission block is divided according to the number candidate value;
s222, determining whether each code block group needs to be retransmitted according to the demodulation result of the code blocks in each code block group;
and S223, acquiring the total number of code blocks in all code block groups needing to be retransmitted in each code block group.
Specifically, determining the number of code blocks included in each code block group when the target transport block is divided according to the number candidate value includes:
determining that the number of code block groups is equal to the number candidate when the number candidate is less than the number of code blocks in the target transport block;
if the number of code blocks in the target transmission block is an integral multiple of the number candidate value, determining that the number of code block groups in each code block group is N, wherein N is C/M, C is the number of code blocks in the target transmission block, and M is the number candidate value;
if the number of the code blocks in the target transmission block is not an integral multiple of the number candidate value, obtaining a remainder M1 obtained by dividing the number of the code blocks in the target transmission block by the number candidate value;
determining that each code block group in the first M1 code block groups comprises the code block number of K1, each code block group in the last M-M1 code block groups comprises the code block number of K2,
c is the number of code blocks in the target transport block and M is the number candidate.
As shown in fig. 2-5, when the number of code blocks in the target transport block transmitted from the transmitting end to the receiving end is 16, the code block groups are divided differently for the number candidates of 2,4,6, and 8, respectively, when the number candidate is 2, the number of code blocks in the target transport block is an integer multiple of the number candidate, the code blocks in the target transport block are divided into 8 code block groups, each of which includes 2 code blocks, when the number candidate is 6, the number of code blocks in the target transport block is not an integer multiple of the number candidate, a remainder obtained by dividing the number of code blocks in the target transport block by the number candidate is 4, that is, results of rounding up and rounding down of results of the number candidate in the M target transport block are 3 and 2, respectively, the code blocks in the target transport block are divided into 6 code block groups, each of the first 4 code block groups includes 3 code blocks, each of the last 2 code block groups comprises 2 code blocks.
When the number candidate is greater than or equal to the number of code blocks in the target transport block:
determining that the number of code block groups is equal to the number of code blocks in the target transport block, each code block group including one code block.
As shown in fig. 6 to 9, when the number of code blocks in the target transport block sent by the sending end to the receiving end is 7, the number candidate values are respectively 2,4,6, and 8, the division manner of the code block groups is different, and when the number candidate value is 8, the number of code blocks in the target transport block is smaller than the number candidate value, then the target transport block is divided into 7 code block groups, each code block group includes one code block, and the other number candidate values are smaller than the number of code blocks in the target transport block, and the division of the code block groups may be performed according to the foregoing method.
After the number of code block groups corresponding to the number candidate value and the number of code blocks included in each code block group are determined, retransmission data of the target transmission block when the target transmission block is divided according to the number candidate value can be determined, whether each code block group needs to be retransmitted or not is determined according to the demodulation result of the code blocks in each code block group, specifically, if the code block group includes a code block of which the demodulation result is NACK, the code block group needs to be retransmitted, and if the demodulation result of each code block in the code block group is ACK, the code block group does not need to be retransmitted. After the code block group requiring retransmission is determined, the total number of code blocks included in all the code block groups requiring retransmission can be obtained.
As shown in fig. 2-5, for a target transport block including 16 code blocks, according to different code block demodulation results, retransmission data of the target transport block is different, as shown in fig. 2, it is assumed that a result of demodulating each code block in the target transport block is 0111111111111111, where 1 represents ACK and 0 represents NACK, when the target transport block is divided according to the number candidate value 8, a code block group to be retransmitted in the target transport block is a first code block group, and includes 2 code blocks in total, that is, retransmission data of the target transport block corresponding to the number candidate value 8 is 2, and when the target transport block is divided according to the number candidate value 4, a code block group to be retransmitted is the first code block group, and includes 4 code blocks in total, that is, retransmission data corresponding to the number candidate value 4 is 4. As shown in fig. 3 again, assuming that the result of demodulating each code block in the target transport block is 0101111111111111, when the target transport block is divided according to the quantity candidate value 8, the code block group to be retransmitted in the target transport block is the first code block group and the second code block group, which totally include 4 code blocks, that is, the retransmission data of the target transport block corresponding to the quantity candidate value 8 is 4, and when the target transport block is divided according to the quantity candidate value 6, the code block group to be retransmitted is the first code block group, which totally includes 3 code blocks, that is, the retransmission data corresponding to the quantity candidate value 6 is 3. The demodulation results for each code block in the target transport block in fig. 4-9 are 0100111111111111, 0100011111111111, 0111111, 0011111, 0010111, 0000111, respectively.
Determining how to divide the target transport block finally according to the retransmission data of the target transport block corresponding to each number candidate value, and then determining retransmission information, specifically, determining the number of target code block groups and the number of code blocks in each target code block group according to the retransmission data of the target transport block corresponding to each number candidate value, includes:
s231, obtaining target ratios respectively corresponding to the quantity candidate values, wherein the target ratios are the ratios of the total number of code blocks of which the demodulation results are NACK to the total number of code blocks contained in the code block group which needs to be retransmitted and corresponds to the quantity candidate values;
s232, determining a target quantity candidate value in each quantity candidate value according to the target ratio;
and S233, taking the number of code block groups when the target transmission block is divided according to the target number candidate value as the number of the target code block groups, and taking the number of code blocks in each code block group when the target transmission block is divided according to the target number candidate value as the number of code blocks in each target code block group.
For each quantity candidate value, determining the retransmission data of the corresponding target transmission block, and it can be seen easily that, because the code block with the NACK demodulation result in the target transmission block is the data that needs to be acquired by the receiving end, the larger the occupation ratio of the code block with the NACK demodulation result in the data retransmitted by the receiving end is, the better the code block is, so that efficient retransmission can be realized with less resource waste. Therefore, after the target ratios corresponding to the respective quantity candidate values are obtained, the value quantity candidate value with the largest target ratio should be selected as the target quantity candidate value, and meanwhile, the smaller the bit number of the retransmission information fed back to the sending end by the receiving end, the better the retransmission information, that is, the smaller the number of code block groups in the target transmission block, the better the retransmission information, so that when the largest target ratio is multiple, the smallest quantity candidate value of the code block groups corresponding to the largest target ratio is selected as the target quantity candidate value. As shown in fig. 2-9 (f (N) in fig. 2-9 is the target ratio, N is the number of code block groups), the number candidate 8 in fig. 2 should be selected as the target number candidate, the number candidate 6 in fig. 3 should be selected as the target number candidate, and so on.
And after the target quantity candidate value is determined, taking the number of code block groups when the target transmission block is divided according to the target quantity candidate value as the number of target code block groups for finally determining retransmission information of the target transmission block, and taking the number of code blocks in each code block group when the target transmission block is divided according to the target quantity candidate value as the number of code blocks in each target code block group.
Referring to fig. 1 again, the HARQ-ACK feedback method based on the code block group provided in this embodiment further includes the steps of:
s300, according to the demodulation result of the code blocks contained in at least one target code block group, the retransmission information of the target transmission block is fed back to the sending end.
After the target transmission block is divided into at least one target code block group, the retransmission information of the target transmission block is fed back to the sending end according to the demodulation result contained in the target code block group, the retransmission information of the target transmission block comprises the number information of the target code block groups and the retransmission indication information of each target code block group, the number indication information of the target code block groups is used for indicating the number of the target code block groups, and the retransmission indication information of the target code block groups is used for indicating whether the target code block groups need to be retransmitted or not.
Specifically, the number prompt information of the target code block group may be directly the number of the target code block group, but since the number of the target code block group may be equal to the number of code blocks in the target transmission block, that is, there may be multiple situations, in one possible implementation, the number prompt information of the target code block group may be set as the target number candidate value, and since the number candidate value is determined, each number candidate value may be distinguished using a fixed number of bits, for example, when the number candidate value has 2, the number prompt information of the target code block group may be 1 bit: 0 or 1, respectively indicating two quantity candidate values, and when the quantity candidate values are 4, the number prompt information of the target code block group may be 2 bits: 00. 01, 10 or 11, respectively indicating 4 number candidate values, the receiving end and the sending end can establish a mapping table of the number candidate values, and the mapping table stores the mapping relation between the number prompt information of the target code block group and the number candidate values.
The retransmission indication information of the target code block group is used to indicate whether the target code block group needs to be retransmitted, and the retransmission indication information of each target code block group can be represented by 1 bit, i.e. 0 or 1, for example, 0 represents NACK, i.e. needs to be retransmitted, and 1 represents ACK, i.e. does not need to be retransmitted.
After receiving retransmission information fed back by the receiving end, the sending end determines a target number candidate value according to the number indication information, further divides a target transmission block according to the target number candidate value to obtain the number of target code block groups and the number of code blocks included in each target code block group, and then determines which target code block group is retransmitted according to the retransmission indication information in the retransmission information. For example, in fig. 7, the demodulation result of each code block in the target transport block is 0011111,1 indicates that the demodulation result is ACK, 0 indicates that the demodulation result is NACK, it is determined that the target number candidate value is 4, the number of target code block groups in the target transport block is 4, the first three target code block groups include 2 code blocks, the last target code block group includes 1 code block, and the code block group to be retransmitted is the first code block group, then the receiving end may feed back to the sending end that the retransmission information of the target transport block is 010111, where 01 is target code block group number indication information, 0111 is retransmission indication information of the target code block group, the sending end may query the mapping table that the target number candidate value corresponding to 01 is 4, the sending end divides the target transport block according to the target number candidate value 4 to obtain the number of target code block groups and the number of code blocks in each target code block group, and then according to the retransmission indication information 0111, and determining that the first code block group needs to be retransmitted, and retransmitting the first code block group to the end terminal. It is easy to see that, compared with the demodulation result of each code block in the target transport block being 0011111, the bit number of the feedback retransmission information in the HARQ-ACK feedback method based on the code block group provided by this embodiment is less, which can reduce signaling overhead, and at the same time, only part of data in the target transport block needs to be retransmitted, which reduces resource occupation.
In summary, this embodiment provides a method for HARQ-ACK feedback based on code block groups, where after a target transport block sent by a sending end is received, code blocks in the target transport block are divided into at least one target code block group according to the number of the code blocks in the target transport block and a demodulation result, and the code block groups that need to be retransmitted in the target transport block are fed back to the sending end, and it is not necessary to feed back to the sending end whether each code block in the target transport block needs to be retransmitted, so that uplink signaling overhead is saved.
It should be understood that, although the steps in the flowcharts shown in the drawings of the present specification are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not limited to being performed in the exact order illustrated and, unless explicitly stated herein, may be performed in other orders. Moreover, at least a portion of the steps in the flowchart may include multiple sub-steps or multiple stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed alternately or alternately with other steps or at least a portion of the sub-steps or stages of other steps.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, databases, or other media used in embodiments provided herein may include non-volatile and/or volatile memory. Non-volatile memory can include read-only memory (ROM), Programmable ROM (PROM), Electrically Programmable ROM (EPROM), Electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), Dynamic RAM (DRAM), Synchronous DRAM (SDRAM), Double Data Rate SDRAM (DDRSDRAM), Enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus Direct RAM (RDRAM), direct bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).
Example two
Based on the foregoing embodiment, the present invention further provides a HARQ-ACK feedback apparatus based on a code block group, as shown in fig. 10, the apparatus includes:
a demodulation module, configured to receive a target transport block sent by a base station, demodulate code blocks in the target transport block, and determine a demodulation result of each code block in the target transport block, which is specifically described in embodiment one;
a code block group dividing module, configured to divide the code blocks in the target transport block into at least one target code block group according to the number of code blocks in the target transport block and a demodulation result, where each target code block group includes at least one code block, which is specifically described in embodiment one;
a feedback module, configured to feed back, to a base station, retransmission information of the target transport block according to a demodulation result of the code blocks included in the at least one target code block group, specifically as described in embodiment one;
the retransmission information of the target transport block includes the number of the target code block groups and retransmission indication information of each target code block group, where the retransmission indication information is used to indicate whether a code block group needs to be retransmitted, which is specifically described in embodiment one.
EXAMPLE III
Based on the above embodiment, the present invention further provides a terminal, as shown in fig. 11, which includes a processor 10 and a memory 20. It is to be understood that fig. 11 only shows some of the components of the terminal, but it is to be understood that not all of the shown components are required to be implemented, and that more or fewer components may be implemented instead.
The memory 20 may in some embodiments be an internal storage unit of the terminal, such as a hard disk or a memory of the terminal. The memory 20 may also be an external storage device of the terminal in other embodiments, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like provided on the terminal. Further, the memory 20 may also include both an internal storage unit and an external storage device of the terminal. The memory 20 is used for storing application software installed in the terminal and various data. The memory 20 may also be used to temporarily store data that has been output or is to be output. In an embodiment, the memory 20 stores a code block group based HARQ-ACK feedback procedure 30, and the code block group based HARQ-ACK feedback procedure 30 can be executed by the processor 10, so as to implement the code block group based HARQ-ACK feedback method in the present application.
The processor 10 may be a Central Processing Unit (CPU), microprocessor or other chip in some embodiments, and is used to execute program codes stored in the memory 20 or process data, such as performing the HARQ-ACK feedback method based on the code block group.
Example four
The present invention also provides a computer readable storage medium having stored therein one or more programs, which are executable by one or more processors, to implement the steps of the codeword block group based HARQ-ACK feedback method as described above.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A HARQ-ACK feedback method based on code block group, the method includes:
receiving a target transmission block sent by a sending end, demodulating code blocks in the target transmission block, and determining the demodulation result of each code block in the target transmission block;
dividing the code blocks in the target transmission block into at least one target code block group according to the number of the code blocks in the target transmission block and a demodulation result, wherein each target code block group comprises at least one code block;
feeding back retransmission information of the target transmission block to the sending end according to the demodulation result of the code blocks contained in the at least one target code block group;
the retransmission information of the target transmission block comprises the number indication information of the target code block groups and the retransmission indication information of each target code block group, wherein the number indication information is used for indicating the number of the target code block groups, and the retransmission indication information is used for indicating whether the target code block groups need to be retransmitted or not;
the dividing the code blocks in the target transmission block into at least one target code block group according to the number of the code blocks in the target transmission block and a demodulation result includes:
acquiring the number candidate values of the code block groups in the target transmission block;
determining retransmission data of the target transmission block when the target transmission block is divided according to the number candidate values respectively, wherein the retransmission data of the target transmission block comprises the total number of code blocks in a code block group which needs to be retransmitted in the target transmission block;
determining the number of the target code block groups and the code block number in each target code block group according to the retransmission data of the target transmission block corresponding to each number candidate value;
the determining retransmission data of the target transport block when the target transport block is divided according to the number candidate values respectively includes:
for each of the quantity candidates:
determining the number of code blocks included in each code block group when the target transport block is divided according to the number candidate value;
determining whether each code block group needs to be retransmitted according to the demodulation result of the code blocks in each code block group;
acquiring the total number of code blocks in all code block groups needing to be retransmitted in each code block group;
determining the number of the target code block groups and the code block number in each target code block group according to the retransmission data of the target transmission block corresponding to each number candidate value, including:
acquiring a target ratio corresponding to each quantity candidate value, wherein the target ratio is the ratio of the total number of code blocks of which the demodulation result is NACK to the total number of code blocks contained in a code block group which needs to be retransmitted and corresponds to the quantity candidate value;
determining a target quantity candidate value in each quantity candidate value according to the target ratio;
taking the number of code block groups when the target transmission block is divided according to the target number candidate value as the number of the target code block groups, and taking the number of code blocks in each code block group when the target transmission block is divided according to the target number candidate value as the number of code blocks in each target code block group;
selecting the number candidate value with the largest target ratio as the target number candidate value, and when the number of the largest target ratios is multiple, selecting the number candidate value with the smallest number of the corresponding code block groups from the number candidate values with the largest target ratios as the target number candidate value;
the number indication information of the target code block group is the target number candidate value, and each of the number candidate values is distinguished by using a fixed number of bits.
2. The method of claim 1, wherein the determining the number of code blocks included in each code block group when the target transport block is divided according to the number candidate value comprises:
determining that the number of code block groups is equal to the number candidate value when the number candidate value is less than the number of code blocks in the target transport block;
if the number of code blocks in the target transport block is an integer multiple of the number candidate value, determining that the number of code blocks in each code block group is X, where X is C/N, C is the number of code blocks in the target transport block, and N is the number candidate value.
3. The method of claim 1, wherein the determining the number of code blocks included in each code block group when the target transport block is divided according to the number candidate value comprises:
determining that the number of code block groups is equal to the number candidate value when the number candidate value is less than the number of code blocks in the target transport block;
if the number of the code blocks in the target transmission block is not an integer multiple of the number candidate value, obtaining a remainder M1 obtained by dividing the number of the code blocks in the target transmission block by the number candidate value;
determining that each code block group in the first M1 code block groups comprises the code block number of K1, each code block group in the last N-M1 code block groups comprises the code block number of K2,
c is the number of code blocks in the target transport block and N is the number candidate.
4. The method of claim 2, wherein the determining the number of code blocks included in each code block group when the target transport block is divided according to the number candidate value comprises:
when the number candidate is greater than or equal to the number of code blocks in the target transport block:
determining that the number of code block groups is equal to the number of code blocks in the target transport block, each code block group including one code block.
5. An apparatus for HARQ-ACK feedback based on a code block group, the apparatus comprising:
the demodulation module is used for receiving a target transmission block sent by a base station, demodulating code blocks in the target transmission block and determining the demodulation result of each code block in the target transmission block;
a code block group dividing module, configured to divide the code blocks in the target transport block into at least one target code block group according to the number of code blocks in the target transport block and a demodulation result, where each target code block group includes at least one code block;
a feedback module, configured to feed back retransmission information of the target transport block to a base station according to a demodulation result of a code block included in the at least one target code block group;
the retransmission information of the target transmission block comprises the number of the target code block groups and retransmission indication information of each target code block group, and the retransmission indication information is used for indicating whether the code block groups need to be retransmitted or not;
the dividing the code blocks in the target transmission block into at least one target code block group according to the number of the code blocks in the target transmission block and a demodulation result includes:
acquiring the number candidate value of the code block group in the target transmission block;
determining retransmission data of the target transmission block when the target transmission block is divided according to the number candidate values respectively, wherein the retransmission data of the target transmission block comprises the total number of code blocks in a code block group which needs to be retransmitted in the target transmission block;
determining the number of the target code block groups and the code block number in each target code block group according to the retransmission data of the target transmission block corresponding to each number candidate value;
the determining retransmission data of the target transport block when the target transport block is divided according to the number candidate values respectively includes:
for each of the quantity candidates:
determining the number of code blocks included in each code block group when the target transport block is divided according to the number candidate value;
determining whether each code block group needs to be retransmitted according to the demodulation result of the code blocks in each code block group;
acquiring the total number of code blocks in all code block groups needing to be retransmitted in each code block group;
determining the number of the target code block groups and the code block number in each target code block group according to the retransmission data of the target transmission block corresponding to each number candidate value, including:
acquiring a target ratio corresponding to each quantity candidate value, wherein the target ratio is the ratio of the total number of code blocks of which the demodulation result is NACK to the total number of code blocks contained in a code block group which needs to be retransmitted and corresponds to the quantity candidate value;
determining a target quantity candidate value in each quantity candidate value according to the target ratio;
taking the number of code block groups when the target transmission block is divided according to the target number candidate value as the number of the target code block groups, and taking the number of code blocks in each code block group when the target transmission block is divided according to the target number candidate value as the number of code blocks in each target code block group;
selecting the number candidate value with the largest target ratio as the target number candidate value, and when the number of the largest target ratios is multiple, selecting the number candidate value with the smallest number of the corresponding code block groups from the number candidate values with the largest target ratios as the target number candidate value;
the number indication information of the target code block group is the target number candidate value, and each number candidate value is distinguished by using a fixed number of bits.
6. A terminal, characterized in that the terminal comprises: a processor, a storage medium communicatively connected to the processor, the storage medium adapted to store a plurality of instructions, the processor adapted to invoke the instructions in the storage medium to perform the steps of implementing the group of code block based HARQ-ACK feedback method according to any of the preceding claims 1-4.
7. A computer readable storage medium, having one or more programs stored thereon, the one or more programs being executable by one or more processors for performing the steps of the method for codeword group based HARQ-ACK feedback according to any of claims 1-4.
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