CN108933642B - Downlink retransmission method based on code block grouping, base station and terminal - Google Patents
Downlink retransmission method based on code block grouping, base station and terminal 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
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
- H04L1/0027—Scheduling of signalling, e.g. occurrence thereof
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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
- H04L1/1607—Details of the supervisory signal
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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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- 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
- H04L1/1867—Arrangements specially adapted for the transmitter end
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Abstract
The embodiment of the invention discloses a downlink retransmission method, a base station and a terminal based on code block grouping, wherein the method comprises the following steps: after determining that downlink data sent to a target terminal exists, a base station generates downlink control information; the downlink control information carries code block grouping number indication information; the base station sends downlink data and downlink control information to a target terminal; a base station receives downlink retransmission indication information sent by a target terminal and determines code block grouping of downlink retransmission; the downlink retransmission indication information includes feedback information of each code block packet corresponding to the downlink data. Compared with the prior art, the embodiment of the invention has the advantages that the terminal carries out code block grouping on the downlink data by indicating the code block grouping number, checks the code block grouping and determines the code block grouping of downlink retransmission, solves the problem of data retransmission of high throughput service of the 5G communication system, and reduces the feedback and resource indication overhead of the system while realizing the increase of the system throughput.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a downlink retransmission method based on code block grouping, a base station and a terminal.
Background
The fifth generation mobile communication technology (5G) main scenario includes: enhanced Mobile Broadband (eMBB), high-reliability Low latency Communications (URLLC), and mass machine type Communications (mMTC). The scenes provide requirements on a 5G communication system such as high reliability, low time delay, large bandwidth, wide coverage and the like.
In the LTE wireless communication protocol, if the bit number of a Transport Block (TB) is greater than the maximum bit number of the transport Block specified by the protocol, Code Block (CB) segmentation processing is performed on the TB, and Cyclic Redundancy Check (CRC) coding is performed on each segmented CB, but an asynchronous Hybrid automatic repeat request (HARQ) technique in the LTE communication system performs retransmission only on the TB, that is, if the TB transmission has an error, a Negative Acknowledgement (NACK) of 1 bit is fed back only to the TB.
In the 5G communication system, a retransmission mode based on feedback of CB or CB packets is used, and a plurality of bits are allowed to be fed back to one TB. The CB grouping is to group all the CBs included in one TB, and one CB group includes a plurality of CBs. During retransmission, only code blocks contained in the CB groups with errors are transmitted, and each CB group only feeds back 1-bit acknowledgement or negative acknowledgement (ACK/NACK, A/N for short), so that the transmission load is reduced, and the system throughput can be increased. Fig. 1 shows a schematic diagram of a retransmission scheme based on CB packets (Group).
However, in the retransmission scheme using feedback by CBs in the 5G communication system, the feedback overhead increases due to the large number of CBs. Therefore, although the retransmission method based on CB feedback can increase the system throughput compared to the retransmission method based on TB feedback, the feedback overhead and complexity of the system are increased, and a balance and a compromise between throughput and system complexity cannot be obtained. The retransmission method based on feedback of the CB does not clearly show how to perform CB grouping, how to feed back ACK/NACK, how to retransmit and the like.
Disclosure of Invention
In view of the foregoing problems, embodiments of the present invention provide a downlink retransmission method based on code block grouping, a base station, and a terminal that overcome the foregoing problems.
In a first aspect, an embodiment of the present invention provides a downlink retransmission method based on code block grouping, including:
after determining that downlink data sent to a target terminal exists, a base station generates downlink control information; wherein, the downlink control information carries code block grouping number indication information;
the base station sends the downlink data and the downlink control information to the target terminal;
the base station receives downlink retransmission indication information sent by the target terminal and determines code block grouping of downlink retransmission; the downlink retransmission indication information includes feedback information of each code block packet corresponding to the downlink data.
Optionally, after determining that there is downlink data sent to the target terminal, the base station generates downlink control information, including:
after determining that downlink data sent to a target terminal exists, the base station determines channel state information of a communication channel between the base station and the target terminal;
the base station determines the code block grouping number corresponding to the channel state information based on the channel state information;
and the base station generates downlink control information based on the code block grouping number.
Optionally, the determining, by the base station, the number of code block groups corresponding to the channel state information based on the channel state information includes:
the base station determines a channel state grade corresponding to the channel state information based on the channel state information and the first corresponding relation; the first corresponding relation is a predetermined corresponding relation between channel state information and a channel state grade;
the base station determines the code block grouping number corresponding to the channel state grade based on the determined channel state grade and the second corresponding relation; the second corresponding relation is the corresponding relation between the predetermined channel state grade and the code block grouping number.
In a second aspect, the present invention further provides a base station, including:
the generating unit is used for generating downlink control information after determining that downlink data sent to the target terminal exists; wherein, the downlink control information carries code block grouping number indication information;
a sending unit, configured to send the downlink data and the downlink control information to the target terminal;
a processing unit, configured to receive downlink retransmission indication information sent by the target terminal, and determine a code block packet of downlink retransmission; the downlink retransmission indication information includes feedback information of each code block packet corresponding to the downlink data.
Optionally, the generating unit is specifically configured to:
determining channel state information of a communication channel between a target terminal and the target terminal after determining that downlink data sent to the target terminal exists;
determining the code block grouping number corresponding to the channel state information based on the channel state information;
and generating downlink control information based on the code block grouping number.
Optionally, the determining, by the generating unit, a code block grouping number corresponding to the channel state information based on the channel state information includes:
determining a channel state grade corresponding to the channel state information based on the channel state information and the first corresponding relation; the first corresponding relation is a predetermined corresponding relation between channel state information and a channel state grade;
determining the code block grouping number corresponding to the channel state grade based on the determined channel state grade and the second corresponding relation; the second corresponding relation is the corresponding relation between the predetermined channel state grade and the code block grouping number.
In a third aspect, the present invention further provides a downlink retransmission method based on code block grouping, including:
a terminal receives downlink data and downlink control information sent by a base station; wherein, the downlink control information carries code block grouping number indication information;
the terminal divides the downlink data based on the code block grouping number to obtain a plurality of code block groups;
the terminal checks each code block group to generate downlink retransmission indication information; the downlink retransmission indication information includes feedback information of each code block packet corresponding to the downlink data;
and the terminal sends the downlink retransmission indication information to the base station so that the base station determines the code block grouping of downlink retransmission.
Optionally, the checking, performed by the terminal, of each code block packet includes:
the terminal respectively performs CRC on all code blocks included in each code block group, and if the CRC of all the code blocks included in the code block group is successful, the feedback information of the code block group is ACK; if the CRC check of any of the code blocks in the code block group fails, the feedback information of the code block group is NACK.
In a fourth aspect, the present invention further provides a terminal, including:
a receiving unit, configured to receive downlink data and downlink control information sent by a base station; wherein, the downlink control information carries code block grouping number indication information;
a dividing unit, configured to divide the downlink data based on the number of code block groups to obtain a plurality of code block groups;
a generating unit, configured to verify each code block packet and generate downlink retransmission indication information; the downlink retransmission indication information includes feedback information of each code block packet corresponding to the downlink data;
a sending unit, configured to send the downlink retransmission indication information to the base station, so that the base station determines a code block packet of downlink retransmission.
Optionally, the generating unit checks each code block packet, and includes:
performing CRC on all code blocks included in each code block group respectively, wherein if the CRC of all the code blocks included in the code block group is successful, the feedback information of the code block group is ACK; if the CRC check of any of the code blocks in the code block group fails, the feedback information of the code block group is NACK.
Compared with the prior art, the code block grouping-based downlink retransmission method, the base station and the terminal provided by the embodiment of the invention are suitable for data retransmission of downlink transmission of a 5G communication system, the terminal carries out code block grouping on downlink data by indicating the number of the code block groups, checks the code block groups and determines the code block groups of the downlink retransmission, the problem of data retransmission in ultrahigh throughput service of the 5G communication system is solved, the system throughput is increased, and the feedback and resource indication overhead of the system are reduced.
Drawings
Fig. 1 is a schematic diagram of a retransmission method based on CB packets in the prior art;
fig. 2 is a schematic diagram illustrating a throughput improvement ratio of CB packet retransmission to TB retransmission according to an embodiment of the present invention;
fig. 3 is a flowchart of a downlink retransmission method based on code block grouping according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a base station according to an embodiment of the present invention;
fig. 5 is a flowchart of another downlink retransmission method based on code block grouping according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a terminal according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another base station according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of another terminal according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, but not all embodiments, of the present invention.
It should be noted that, in this document, relational terms such as "first" and "second", and the like are used only to distinguish the same names, and do not imply a relationship or order between the names.
In general, compared with the retransmission method based on the TB, the retransmission method based on the CB packet can reduce the use of link resources, thereby effectively improving the throughput of the system. Assuming the error rate of the transmission TB to be Pe_TBError rate P of CB packete_GroupComprises the following steps:
wherein M isGroupIs the number of CB packets.
Ratio P of correct decoding of each CB packet based on retransmission mode of CB packetGroup_THPComprises the following steps:
wherein N isbNumber of bits for first transmission, NIs the number of HARQ retransmissions.
Therefore, the throughput improvement ratio R of the retransmission scheme based on CB packets as compared with the retransmission scheme based on TB is improvedthroughputIs composed of
Wherein, PTB_THPIs the rate at which the TB is correctly decoded.
FIG. 2 is a graph of the throughput improvement ratio of CB packet retransmission to TB retransmission, given Pe_TB0.1 and Pe_TBR in two cases of 0.2throughputIn fig. 2, the number of HARQ retransmissions N is 1.
As can be seen from FIG. 2, when the number of CB packets is small, for example, the number of CB packets is 2 to 10, Pe_TBThroughput improvement less than P at 0.1e_TBThe throughput is improved to a degree of 0.2, that is, for the retransmission scheme based on CB packets, when the channel environment is poor, the number of selected code block packets is small, which is beneficial to the improvement of throughput; when the channel environment is good, because the number of CBs with bit errors in the TBs is small, if there are many CBs included in a CB packet, the number of CBs included in one CB packet is not large enough, that is, the number of code block packets selected is large, which is favorable for the situation with good channel environment. Because the code block grouping number is larger than a certain number, the throughput improvement cannot be further improved, and in practical design, an appropriate code block grouping number needs to be selected according to specific conditions.
Therefore, as shown in fig. 3, the present embodiment discloses a downlink retransmission method based on code block grouping, which may include the following steps 301 to 303:
301. after determining that downlink data sent to a target terminal exists, a base station generates downlink control information; wherein, the downlink control information carries code block grouping number indication information.
In this embodiment, the base station generates downlink control information carrying code block group number indication information, so that the base station can control the terminal to divide the downlink data into the number of code block groups.
302. And the base station sends the downlink data and the downlink control information to the target terminal.
303. The base station receives downlink retransmission indication information sent by the target terminal and determines code block grouping of downlink retransmission; the downlink retransmission indication information includes feedback information of each code block packet corresponding to the downlink data.
In this embodiment, the downlink retransmission indication information is a group of ACK/NACK sequences, and the sum of ACK and NACK included in the sequences is the code block group number indicated by the code block group number indication information.
Compared with the prior art, the embodiment of the invention has the advantages that the terminal carries out code block grouping on the downlink data by indicating the code block grouping number, checks the code block grouping and determines the code block grouping of downlink retransmission, solves the problem of data retransmission of high throughput service of the 5G communication system, and reduces the feedback and resource indication overhead of the system while realizing the increase of the system throughput.
In a specific example, after determining that there is downlink data to be sent to the target terminal in step 301, the base station generates downlink control information, which specifically includes the following steps 3011 to 3013 that are not shown in fig. 3:
3011. and after determining that the downlink data sent to the target terminal exists, the base station determines the channel state information of a communication channel between the base station and the target terminal.
In this embodiment, the channel state information may be obtained through the prior art such as measurement, feedback, detection, and the like, which is not described in detail in this embodiment.
3012. And the base station determines the code block grouping number corresponding to the channel state information based on the channel state information.
In the embodiment, the number of code block groups is determined through the channel state information, so that the system throughput is increased, and the feedback and resource indication overhead of the system are reduced.
3013. And the base station generates downlink control information based on the code block grouping number.
Compared with the prior art, the embodiment of the invention determines the code block grouping number through the channel state information, so that the terminal performs code block grouping on the downlink data, checks the code block grouping and determines the code block grouping of downlink retransmission, solves the data retransmission problem of high throughput service of the 5G communication system, and reduces the feedback and resource indication overhead of the system while realizing the increase of the system throughput.
In a specific example, in step 3012, the determining, by the base station, a code block grouping number corresponding to the channel state information based on the channel state information specifically includes:
the base station determines a channel state grade corresponding to the channel state information based on the channel state information and the first corresponding relation; the first corresponding relation is a predetermined corresponding relation between channel state information and a channel state grade;
the base station determines the code block grouping number corresponding to the channel state grade based on the determined channel state grade and the second corresponding relation; the second corresponding relation is the corresponding relation between the predetermined channel state grade and the code block grouping number.
In this embodiment, the code block group number corresponding to the channel state information is determined according to the predetermined correspondence between the channel state information and the channel state level and the predetermined correspondence between the channel state level and the code block group number, where a low channel state level corresponds to a small number of code block groups, and a high channel state level corresponds to a large number of code block groups.
In this embodiment, the first corresponding relationship and/or the second corresponding relationship may be stored in a list form, and an index of the list may be used as code block group number indication information. The list is stored in the base station and the terminal.
Compared with the prior art, the embodiment of the invention determines the code block grouping number corresponding to the channel state information through the predetermined corresponding relationship between the channel state information and the channel state grade and the predetermined corresponding relationship between the channel state grade and the code block grouping number, so that the terminal performs code block grouping on the downlink data, checks the code block grouping and determines the code block grouping of downlink retransmission, solves the data retransmission problem of high throughput service of the 5G communication system, realizes the increase of system throughput and reduces the feedback and resource indication overhead of the system.
As shown in fig. 4, the present embodiment discloses a base station, which may include the following units: the generating unit 41, the transmitting unit 42, and the processing unit 43, each of which is specifically described as follows:
a generating unit 41, configured to generate downlink control information after determining that downlink data sent to the target terminal exists; wherein, the downlink control information carries code block grouping number indication information;
a sending unit 42, configured to send the downlink data and the downlink control information to the target terminal;
a processing unit 43, configured to receive downlink retransmission indication information sent by the target terminal, and determine a code block packet of downlink retransmission; the downlink retransmission indication information includes feedback information of each code block packet corresponding to the downlink data.
The embodiment of the method shown in fig. 3 can be implemented in the present embodiment, and therefore, the detailed description and effects refer to the embodiment of the method shown in fig. 3, which is not repeated herein.
Compared with the prior art, the base station disclosed by the embodiment of the invention enables the terminal to perform code block grouping on the downlink data by indicating the code block grouping number, performs verification on the code block grouping and determines the code block grouping of downlink retransmission, solves the data retransmission problem of high throughput service of the 5G communication system, and reduces the feedback and resource indication overhead of the system while realizing the increase of the system throughput.
As shown in fig. 5, the present embodiment discloses a downlink retransmission method based on code block grouping, which may include the following steps 501 to 504:
501. a terminal receives downlink data and downlink control information sent by a base station; wherein, the downlink control information carries code block grouping number indication information;
502. the terminal divides the downlink data based on the code block grouping number to obtain a plurality of code block groups;
503. the terminal checks each code block group to generate downlink retransmission indication information; the downlink retransmission indication information includes feedback information of each code block packet corresponding to the downlink data;
504. and the terminal sends the downlink retransmission indication information to the base station so that the base station determines the code block grouping of downlink retransmission.
Compared with the prior art, the embodiment of the invention has the advantages that the terminal carries out code block grouping on the downlink data by indicating the code block grouping number, checks the code block grouping and determines the code block grouping of downlink retransmission, solves the problem of data retransmission of high throughput service of the 5G communication system, and reduces the feedback and resource indication overhead of the system while realizing the increase of the system throughput.
In a specific example, the checking, by the terminal, of each code block packet in step 503 includes:
the terminal respectively performs CRC on all code blocks included in each code block group, and if the CRC of all the code blocks included in the code block group is successful, the feedback information of the code block group is ACK; if the CRC check of any of the code blocks in the code block group fails, the feedback information of the code block group is NACK.
In this embodiment, the terminal performs code block grouping on the received downlink data, and performs CRC check on all CBs included in each code block grouping. If a CB is detected to have errors, marking the code block grouping as NACK; conversely, if all CBs contained in the code block packet do not detect an error, the code block packet is flagged as an ACK.
In this embodiment, the terminal completes CRC check of all code block groups to form a group of ACK/NACK sequences, and the sequence is transmitted to the base station through an uplink control channel or an uplink data channel.
In this embodiment, the base station receives the code block grouping ACK/NACK sequence, determines the code block grouping number marked with NACK according to the ACK/NACK sequence, and retransmits only the code block grouping marked with NACK.
Compared with the prior art, the embodiment of the invention has the advantages that the terminal carries out code block grouping on the downlink data by indicating the code block grouping number, checks the code block grouping and determines the code block grouping of downlink retransmission, solves the problem of data retransmission of high throughput service of the 5G communication system, and reduces the feedback and resource indication overhead of the system while realizing the increase of the system throughput.
As shown in fig. 6, the present embodiment discloses a terminal, which may include the following units: the receiving unit 61, the dividing unit 62, the generating unit 63, and the transmitting unit 64 are specifically described as follows:
a receiving unit 61, configured to receive downlink data and downlink control information sent by a base station; wherein, the downlink control information carries code block grouping number indication information;
a dividing unit 62, configured to divide the downlink data based on the number of code block groups to obtain a plurality of code block groups;
a generating unit 63, configured to verify each code block packet and generate downlink retransmission indication information; the downlink retransmission indication information includes feedback information of each code block packet corresponding to the downlink data;
a sending unit 64, configured to send the downlink retransmission indication information to the base station, so that the base station determines a code block packet of downlink retransmission.
The embodiment of the method shown in fig. 5 can be implemented in the present embodiment, and therefore, the detailed description and effects refer to the embodiment of the method shown in fig. 5, which is not repeated herein.
Compared with the prior art, the base station disclosed by the embodiment of the invention enables the terminal to perform code block grouping on the downlink data by indicating the code block grouping number, performs verification on the code block grouping and determines the code block grouping of downlink retransmission, solves the data retransmission problem of high throughput service of the 5G communication system, and reduces the feedback and resource indication overhead of the system while realizing the increase of the system throughput.
As shown in fig. 7, the present embodiment discloses a base station, including: a processor 701, a memory 702, a communication interface 703 and a bus 704;
the processor 701, the memory 702 and the communication interface 703 complete mutual communication through the bus 704;
the communication interface 703 is used for information transmission between external devices; the external device is, for example, a terminal;
the processor 701 is configured to call the program instructions in the memory 702 to perform the methods provided by the method embodiments related to fig. 3, for example, including:
after determining that downlink data sent to a target terminal exists, a base station generates downlink control information; wherein, the downlink control information carries code block grouping number indication information;
the base station sends the downlink data and the downlink control information to the target terminal;
the base station receives downlink retransmission indication information sent by the target terminal and determines code block grouping of downlink retransmission; the downlink retransmission indication information includes feedback information of each code block packet corresponding to the downlink data.
Embodiments of the present invention also provide a non-transitory computer-readable storage medium storing computer instructions that cause the computer to perform a method as provided by the method embodiments associated with fig. 3, for example, including:
after determining that downlink data sent to a target terminal exists, a base station generates downlink control information; wherein, the downlink control information carries code block grouping number indication information;
the base station sends the downlink data and the downlink control information to the target terminal;
the base station receives downlink retransmission indication information sent by the target terminal and determines code block grouping of downlink retransmission; the downlink retransmission indication information includes feedback information of each code block packet corresponding to the downlink data.
As shown in fig. 8, the present embodiment provides a terminal, including: a processor 801, a memory 802, a communication interface 803, and a bus 804;
the processor 801, the memory 802 and the communication interface 803 complete mutual communication through the bus 804;
the communication interface 803 is used for information transmission between external devices; the external device is for example a base station.
The processor 801 is configured to call program instructions in the memory 802 to perform the methods provided by the method embodiments described in relation to fig. 5, for example, including:
a terminal receives downlink data and downlink control information sent by a base station; wherein, the downlink control information carries code block grouping number indication information;
the terminal divides the downlink data based on the code block grouping number to obtain a plurality of code block groups;
the terminal checks each code block group to generate downlink retransmission indication information; the downlink retransmission indication information includes feedback information of each code block packet corresponding to the downlink data;
and the terminal sends the downlink retransmission indication information to the base station so that the base station determines the code block grouping of downlink retransmission.
Embodiments of the present invention also provide a non-transitory computer-readable storage medium storing computer instructions that cause the computer to perform a method as provided by the method embodiments associated with fig. 5, for example, including:
a terminal receives downlink data and downlink control information sent by a base station; wherein, the downlink control information carries code block grouping number indication information;
the terminal divides the downlink data based on the code block grouping number to obtain a plurality of code block groups;
the terminal checks each code block group to generate downlink retransmission indication information; the downlink retransmission indication information includes feedback information of each code block packet corresponding to the downlink data;
and the terminal sends the downlink retransmission indication information to the base station so that the base station determines the code block grouping of downlink retransmission.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention, and are not limited thereto; although embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A downlink retransmission method based on code block grouping is characterized by comprising the following steps:
after determining that downlink data sent to a target terminal exists, a base station generates downlink control information; wherein, the downlink control information carries code block grouping number indication information;
the base station sends the downlink data and the downlink control information to the target terminal;
the base station receives downlink retransmission indication information sent by the target terminal and determines code block grouping of downlink retransmission; the downlink retransmission indication information includes feedback information of each code block packet corresponding to the downlink data;
the downlink retransmission indication information is a group of ACK/NACK sequences, and the sum of ACK and NACK contained in the ACK/NACK sequences is the code block group number indicated by the code block group number indication information;
after determining that downlink data sent to a target terminal exists, the base station generates downlink control information, including:
after determining that downlink data sent to a target terminal exists, the base station determines channel state information of a communication channel between the base station and the target terminal;
the base station determines the code block grouping number corresponding to the channel state information based on the channel state information;
the base station generates downlink control information based on the code block grouping number;
the base station determines the number of code block groups corresponding to the channel state information based on the channel state information, and the method comprises the following steps:
the base station determines a channel state grade corresponding to the channel state information based on the channel state information and the first corresponding relation; the first corresponding relation is a predetermined corresponding relation between channel state information and a channel state grade;
the base station determines the code block grouping number corresponding to the channel state grade based on the determined channel state grade and the second corresponding relation;
the second corresponding relation is the corresponding relation between the predetermined channel state grade and the code block grouping number;
and determining the code block grouping number corresponding to the channel state information according to the first corresponding relation and the second corresponding relation.
2. A base station, comprising:
the generating unit is used for generating downlink control information after determining that downlink data sent to the target terminal exists; wherein, the downlink control information carries code block grouping number indication information;
a sending unit, configured to send the downlink data and the downlink control information to the target terminal;
a processing unit, configured to receive downlink retransmission indication information sent by the target terminal, and determine a code block packet of downlink retransmission; the downlink retransmission indication information includes feedback information of each code block packet corresponding to the downlink data;
the downlink retransmission indication information is a group of ACK/NACK sequences, and the sum of ACK and NACK contained in the ACK/NACK sequences is the code block group number indicated by the code block group number indication information;
wherein the generating unit is specifically configured to:
determining channel state information of a communication channel between a target terminal and the target terminal after determining that downlink data sent to the target terminal exists;
determining the code block grouping number corresponding to the channel state information based on the channel state information;
generating downlink control information based on the code block grouping number;
the generating unit determines the code block grouping number corresponding to the channel state information based on the channel state information, and comprises the following steps:
determining a channel state grade corresponding to the channel state information based on the channel state information and the first corresponding relation; the first corresponding relation is a predetermined corresponding relation between channel state information and a channel state grade;
determining the code block grouping number corresponding to the channel state grade based on the determined channel state grade and the second corresponding relation; the second corresponding relation is the corresponding relation between the predetermined channel state grade and the code block grouping number;
and determining the code block grouping number corresponding to the channel state information according to the first corresponding relation and the second corresponding relation.
3. A downlink retransmission method based on code block grouping is characterized by comprising the following steps:
a terminal receives downlink data and downlink control information sent by a base station; wherein, the downlink control information carries code block grouping number indication information;
the terminal divides the downlink data based on the code block grouping number to obtain a plurality of code block groups;
the terminal checks each code block group to generate downlink retransmission indication information; the downlink retransmission indication information includes feedback information of each code block packet corresponding to the downlink data;
the downlink retransmission indication information is a group of ACK/NACK sequences, and the sum of ACK and NACK contained in the ACK/NACK sequences is the code block group number indicated by the code block group number indication information;
the terminal sends the downlink retransmission indication information to the base station so that the base station determines the code block grouping of downlink retransmission;
the code block grouping number indication information is determined by the base station based on channel state information, and specifically includes:
the base station determines a channel state grade corresponding to the channel state information based on the channel state information and the first corresponding relation; the first corresponding relation is a predetermined corresponding relation between channel state information and a channel state grade;
the base station determines the code block grouping number corresponding to the channel state grade based on the determined channel state grade and the second corresponding relation; the second corresponding relation is the corresponding relation between the predetermined channel state grade and the code block grouping number;
and determining the code block grouping number corresponding to the channel state information according to the first corresponding relation and the second corresponding relation.
4. The downlink retransmission method according to claim 3, wherein the checking, by the terminal, for each code block packet includes:
the terminal respectively performs CRC on all code blocks included in each code block group, and if the CRC of all the code blocks included in the code block group is successful, the feedback information of the code block group is ACK; if the CRC check of any of the code blocks in the code block group fails, the feedback information of the code block group is NACK.
5. A terminal, comprising:
a receiving unit, configured to receive downlink data and downlink control information sent by a base station; wherein, the downlink control information carries code block grouping number indication information;
a dividing unit, configured to divide the downlink data based on the number of code block groups to obtain a plurality of code block groups;
a generating unit, configured to verify each code block packet and generate downlink retransmission indication information; the downlink retransmission indication information includes feedback information of each code block packet corresponding to the downlink data;
the downlink retransmission indication information is a group of ACK/NACK sequences, and the sum of ACK and NACK contained in the ACK/NACK sequences is the code block group number indicated by the code block group number indication information;
a sending unit, configured to send the downlink retransmission indication information to the base station, so that the base station determines a code block packet of downlink retransmission;
the code block grouping number indication information is determined by the base station based on channel state information, and specifically includes:
the base station determines a channel state grade corresponding to the channel state information based on the channel state information and the first corresponding relation; the first corresponding relation is a predetermined corresponding relation between channel state information and a channel state grade;
the base station determines the code block grouping number corresponding to the channel state grade based on the determined channel state grade and the second corresponding relation; the second corresponding relation is the corresponding relation between the predetermined channel state grade and the code block grouping number;
and determining the code block grouping number corresponding to the channel state information according to the first corresponding relation and the second corresponding relation.
6. The terminal according to claim 5, wherein the generating unit checks each code block packet, and comprises:
performing CRC on all code blocks included in each code block group respectively, wherein if the CRC of all the code blocks included in the code block group is successful, the feedback information of the code block group is ACK; if the CRC check of any of the code blocks in the code block group fails, the feedback information of the code block group is NACK.
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| CN112769527B (en) * | 2020-12-30 | 2022-05-20 | 鹏城实验室 | HARQ-ACK feedback method, device and terminal based on code block group |
| WO2024000562A1 (en) * | 2022-07-01 | 2024-01-04 | 新华三技术有限公司 | Data transmission method, apparatus, storage medium and electronic device |
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