CN109699075B

CN109699075B - Uplink HARQ codebook feedback and receiving method, device and medium

Info

Publication number: CN109699075B
Application number: CN201710984479.0A
Authority: CN
Inventors: 周伟; 倪吉庆
Original assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Current assignee: China Mobile Communications Group Co Ltd; China Mobile Communications Ltd Research Institute
Priority date: 2017-10-20
Filing date: 2017-10-20
Publication date: 2023-01-17
Anticipated expiration: 2037-10-20
Also published as: CN109699075A

Abstract

The invention discloses a method, a device and a medium for feeding back and receiving an uplink HARQ codebook, which are used for feeding back and receiving the HARQ codebook after a CBG-based transmission mode is introduced. The uplink HARQ codebook feedback method comprises the following steps: receiving DCI for indicating uplink transmission, wherein the DCI carries CBG-DAI; generating an uplink HARQ codebook according to the following process aiming at a hybrid automatic repeat request (HARQ) window corresponding to the DCI: sequentially arranging feedback bits corresponding to downlink transmission received in the HARQ window, and filling other bits with preset values according to the CBG-DAI to obtain an uplink HARQ codebook; generating a scrambling code sequence aiming at the uplink HARQ codebook; and the uplink HARQ codebook is scrambled by utilizing the scrambling code sequence and then is sent to a network side.

Description

Method, device and medium for feeding back and receiving uplink HARQ codebook

Technical Field

The present invention relates to the field of wireless communications technologies, and in particular, to a method, an apparatus, and a medium for receiving an uplink HARQ codebook feedback.

Background

This section is intended to provide a background or context to the embodiments of the invention that are recited in the claims. The description herein is not admitted to be prior art by inclusion in this section.

In an LTE (Long Time Evolution, long term Evolution) system, a Transport Block (TB) received by a terminal in a certain downlink subframe may include multiple Code Blocks (CBs), but uplink HARQ (Hybrid Automatic Repeat reQuest) information sent by the terminal is for the entire TB, that is, only 1bit of ACK/NACK information is fed back for the TB. If a certain CB in the TB has a transmission error, all CBs in the whole TB need to be retransmitted. In the current standardization process of 5G, in order to improve spectrum efficiency, a block-based (CBG-based) HARQ mode is introduced. The 1 TB contains a plurality of CBGs, and the 1 CBG contains 1 or more CBs. When some CBs in the TB have transmission errors, only the CBG corresponding to the CB needs to be retransmitted. To support CBG-based transmission, the terminal needs to send multi-bit uplink HARQ information, i.e. to feed back ACK/NACK information of each CBG.

On the other hand, in the TD-LTE system, uplink and downlink transmission is in a time division manner, and uplink and downlink subframes do not correspond to each other one by one, so HARQ information from multiple downlink transport blocks on one or multiple carriers may be transmitted in the same uplink subframe, that is, HARQ multiplexing (HARQ). Under the condition of giving the uplink and downlink proportion, a certain uplink subframe corresponds to a fixed downlink subframe set, and the set is called as an HARQ window. The number of bits fed back by the terminal in the uplink subframe is equal to the number of downlink transport blocks actually sent in the HARQ window, and this feedback mode is called as a dynamic HARQ codebook. In order to avoid the terminal from missing Downlink transmission in the HARQ window, LTE designs a DAI (Downlink Assignment Index) mechanism, that is, the number of Downlink transport blocks in the HARQ window is indicated by a DAI bit field of DCI (Downlink Control Information). Specifically, the DL-DAI bit field in the DCI signaling for scheduling downlink transmission indicates that the current downlink transmission is the second downlink transmission within the HARQ window, and the UL-DAI bit field in the DCI signaling for scheduling uplink transmission indicates the total number of downlink transmissions within the HARQ window. And the terminal judges whether the missed detection exists or not by comparing the values of the DL-DAI and the UL-DAI. The final HARQ codebook length, i.e. the number of bits fed back by the terminal, is equal to the value indicated by the UL-DAI.

If the terminal is configured for CBG-based transmission mode, multiple bits are fed back for each downlink transmission within the HARQ window. If a semi-static HARQ codebook mode is adopted (that is, the number of fed-back bits is equal to the number of downlink subframes in the HARQ window multiplied by the number of HARQ bits pre-configured for each downlink subframe), because each downlink subframe in the HARQ window does not always have downlink transmission and the number of CBGs actually sent by each downlink transmission is not always equal to the number of pre-configured CBGs (the number of CBGs pre-configured on different carriers may also be different), such a feedback mode would greatly increase the overhead and waste of uplink control signaling, and is not favorable for uplink coverage. Therefore, in the 5G standardization process, especially after a multi-bit CBG-based transmission mode is introduced, in order to reduce uplink control signaling overhead and enhance uplink coverage, a DAI mechanism also needs to be supported to implement a dynamic HARQ codebook.

However, the DAI mechanism in the existing LTE is TB-level, i.e. the DAI count is for one downlink transmission. In 5G, when the terminal increases the CBG-based transmission mode, the number of CBGs in each downlink transmission may be different, and the DAI still using TB-level cannot help the terminal determine the HARQ codebook length that needs to be fed back. Therefore, after the CBG-based transmission mode is introduced, how to perform feedback of the HARQ codebook becomes one of the technical problems to be solved urgently in the prior art.

Disclosure of Invention

The embodiment of the invention provides a method, a device and a medium for feeding back and receiving an uplink HARQ codebook, which are used for feeding back and receiving the HARQ codebook after a CBG-based transmission mode is introduced.

In a first aspect, a method for feeding back an uplink HARQ codebook is provided, including:

receiving downlink control information DCI for indicating uplink transmission, wherein the DCI carries a code block group downlink configuration index CBG-DAI;

generating an uplink HARQ codebook according to the following process aiming at a hybrid automatic repeat request (HARQ) window corresponding to the DCI: sequentially arranging feedback bits corresponding to downlink transmission received in the HARQ window, and filling other bits with preset values according to the CBG-DAI to obtain an uplink HARQ codebook;

generating a scrambling code sequence aiming at the uplink HARQ codebook;

and the uplink HARQ codebook is scrambled by utilizing the scrambling code sequence and then is sent to a network side.

Optionally, generating a scrambling code sequence for the uplink HARQ codebook specifically includes:

for each downlink transmission contained in the HARQ window, if the downlink transmission is received, determining that the bit position of the downlink transmission corresponding to the scrambling code sequence is a first preset value; and if the downlink transmission is not received, determining that the bit corresponding to the downlink transmission in the scrambling code sequence is a second preset value.

Optionally, the length of the scrambling code sequence is a preset value, and the length of the scrambling code sequence is not less than the number of downlink transmissions included in the HARQ window.

Optionally, the scrambling code sequence length is determined according to the following method:

and determining the length of the scrambling code sequence according to the length of the CBG-DAI bit field in the DCI and the maximum value of the number of the CBGs which are pre-configured for each downlink transmission and contained in an HARQ window.

Before receiving downlink control information DCI for indicating uplink transmission, the method further includes:

receiving downlink control information DCI used for indicating each downlink transmission in the HARQ window, wherein the DCI carries TA-DAI; and

for each downlink transmission in the HARQ window, determining the corresponding bit position of the current downlink transmission in the scrambling code sequence according to the following method:

and aiming at each downlink transmission in the HARQ window, determining the corresponding bit position of the current downlink transmission in the scrambling code sequence according to the TA-DAI carried in the DCI indicating the current downlink transmission.

In a second aspect, an uplink HARQ codebook receiving method is provided, including:

sending downlink control information DCI for indicating uplink transmission to a terminal aiming at a hybrid automatic repeat request HARQ window, wherein the DCI carries a code block group downlink configuration index CBG-DAI;

receiving HARQ codebook information fed back by the terminal aiming at the HARQ window, wherein the HARQ codebook information is obtained by scrambling the terminal by using a scrambling code sequence generated by the terminal;

determining a target scrambling code sequence capable of correctly decoding the HARQ codebook information;

decoding the HARQ codebook information according to the target scrambling code sequence to obtain an HARQ codebook fed back by the terminal;

and determining a transport block or a code block group CBG which needs to be retransmitted in the HARQ window according to the obtained HARQ codebook.

The length of the scrambling code sequence is a preset value, and the length of the scrambling code sequence is not less than the downlink transmission times contained in the HARQ window; and

determining a target scrambling code sequence capable of correctly decoding the HARQ codebook information, specifically including:

generating different scrambling code sequences by utilizing a first preset value and a second preset value according to the length of the scrambling code sequence;

and respectively trying to decode the HARQ codebook information by using each generated scrambling code sequence until a target scrambling code sequence which can correctly decode the HARQ codebook information is determined.

determining the length of the scrambling code sequence according to the length of the CBG-DAI bit field in the DCI and the maximum value of the number of CBGs pre-configured for each downlink transmission in a HARQ window

Optionally, if the target scrambling code sequence capable of correctly decoding the HARQ codebook information is not determined, the method further includes:

determining that all transport blocks contained within the HARQ window need to be retransmitted.

In a third aspect, an uplink HARQ codebook feedback device is provided, including:

a receiving unit, configured to receive downlink control information DCI for indicating uplink transmission, where the DCI carries a code block group downlink configuration index CBG-DAI;

a first generating unit, configured to generate an uplink HARQ codebook according to the following procedure for a hybrid automatic repeat request HARQ window corresponding to the DCI: sequentially arranging feedback bits corresponding to downlink transmission received in the HARQ window, and filling other bits with preset values according to the CBG-DAI to obtain an uplink HARQ codebook;

a second generating unit, configured to generate a scrambling code sequence for the uplink HARQ codebook;

and the sending unit is used for sending the scrambled uplink HARQ codebook to a network side after scrambling the uplink HARQ codebook by using the scrambling code sequence.

Optionally, the second generating unit is specifically configured to, for each downlink transmission included in the HARQ window, if the downlink transmission is received, determine that a bit corresponding to the downlink transmission in the scrambling sequence is a first preset value; and if the downlink transmission is not received, determining that the bit corresponding to the downlink transmission in the scrambling code sequence is a second preset value.

And the length of the scrambling code sequence is a preset value, and the length of the scrambling code sequence is not less than the downlink transmission times contained in the HARQ window.

Optionally, the uplink HARQ codebook feedback device further includes:

a first determining unit, configured to determine the scrambling code sequence length according to the CBG-DAI bit field length in the DCI and a maximum value of the number of CBGs preconfigured for each downlink transmission included in a HARQ window.

Optionally, the uplink HARQ codebook feedback device further includes a second determining unit, where:

the receiving unit is further configured to receive downlink control information DCI for indicating each downlink transmission in the HARQ window, where the DCI carries a TA-DAI;

and the second determining unit is configured to determine, for each downlink transmission in the HARQ window, a bit corresponding to the current downlink transmission in the scrambling code sequence according to the TA-DAI carried in the DCI indicating the current downlink transmission.

In a fourth aspect, an uplink HARQ codebook receiving apparatus is provided, including:

a sending unit, configured to send, to a terminal, DCI for indicating uplink transmission for a hybrid automatic repeat request HARQ window, where the DCI carries a code block group downlink configuration index CBG-DAI;

a receiving unit, configured to receive HARQ codebook information fed back by the terminal for the HARQ window, where the HARQ codebook information is obtained by scrambling the terminal by using a scrambling code sequence generated by the terminal;

a first determining unit, configured to determine a target scrambling code sequence capable of correctly decoding the HARQ codebook information;

an obtaining unit, configured to decode the HARQ codebook information according to the target scrambling code sequence to obtain an HARQ codebook fed back by the terminal;

and the second determining unit is used for determining the transport block or the code block group CBG which needs to be retransmitted in the HARQ window according to the obtained HARQ codebook.

The length of a scrambling sequence is a preset value, and the length of the scrambling sequence is not less than the number of downlink transmission times contained in the HARQ window; and

the first determining unit is specifically configured to generate different scrambling code sequences by using a first preset value and a second preset value according to the length of the scrambling code sequence; and respectively trying to decode the HARQ codebook information by using each generated scrambling code sequence until a target scrambling code sequence which can correctly decode the HARQ codebook information is determined.

Optionally, the uplink HARQ codebook receiving apparatus further includes:

a third determining unit, configured to determine the scrambling code sequence length according to the CBG-DAI bit field length in the DCI and a maximum value of the number of CBGs preconfigured for each downlink transmission included in the HARQ window.

In a fifth aspect, a communication apparatus is provided, including: a processor, a memory, and a transceiver; the memory stores computer programs, and the processor is configured to read the programs in the memory and execute any one of the steps of the uplink HARQ codebook feedback method or the uplink HARQ codebook receiving method.

In a sixth aspect, a computer storage medium is provided, where the computer storage medium stores computer-executable instructions for causing the computer to execute any one of the steps of the uplink HARQ codebook feedback method or the uplink HARQ codebook receiving method.

According to the uplink HARQ codebook feedback and receiving method, device and medium provided by the embodiment of the invention, for DCI (Downlink control information) of scheduling uplink transmission, a terminal receives DCI according to CBG-DAI, and dynamically generates the HARQ codebook corresponding to the DCI by aiming at the HARQ window corresponding to the DCI, and transmits the HARQ codebook to a network side after scrambling, and the network side determines a transmission block or a code block group to be retransmitted according to a scrambling sequence capable of descrambling HARQ codebook information, so that the feedback and the reception of the HARQ codebook are realized under a CBG-DAI-based transmission mode.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic flowchart illustrating an implementation flow of an uplink HARQ codebook feedback method according to an embodiment of the present invention;

fig. 2 is a schematic diagram of one possible example of a TB-DAI in DCI for scheduling nth downlink transmission and a CBG-DAI in DCI for scheduling uplink transmission according to the embodiment of the present invention;

fig. 3 is a first schematic diagram of a terminal missing detection of a downlink transmission according to an embodiment of the present invention;

fig. 4 is a second schematic diagram of a terminal missing detection of a downlink transmission according to an embodiment of the present invention;

fig. 5 is a schematic diagram of a terminal missing detection for two consecutive downlink transmissions according to an embodiment of the present invention;

fig. 6 is a schematic diagram of a terminal missing detection of two discontinuous downlink transmissions according to an embodiment of the present invention;

fig. 7 is a schematic diagram illustrating determination of an uplink HARQ feedback codebook when a terminal fails to detect two discontinuous downlink transmissions according to an embodiment of the present invention;

FIG. 8 is a diagram illustrating a terminal determining a length of a scrambling sequence according to an embodiment of the present invention;

fig. 9 is a schematic diagram illustrating an implementation flow of an uplink HARQ receiving method according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of an uplink HARQ feedback device according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of an uplink HARQ receiving apparatus according to an embodiment of the present invention;

fig. 12 is a schematic diagram of a communication device according to an embodiment of the present invention.

Detailed Description

In order to realize the feedback and reception of the HARQ codebook in the CBG-DAI-based transmission mode, the embodiment of the invention provides a method, a device and a medium for receiving the uplink HARQ codebook feedback.

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, it being understood that the preferred embodiments described herein are for purposes of illustration and explanation only and are not intended to be limiting of the present invention, and that the embodiments and features of the embodiments may be combined with each other without conflict.

As shown in fig. 1, which is a schematic diagram of an implementation flow of an uplink HARQ codebook feedback method provided in an embodiment of the present invention, the method may include the following steps:

s11, receiving downlink control information DCI for indicating uplink transmission, wherein the DCI carries CBG-DAI.

In the embodiment of the invention, the terminal side receives DCI (Downlink control information) for scheduling uplink transmission according to CBG-DAI (code block group downlink configuration index), and the terminal receives DCI for scheduling downlink transmission according to TB-DAI. The TB-DAI is used for telling the terminal that the current downlink transmission is the downlink transmission of the second time in the HARQ window, and the CBG-DAI tells the terminal the number of CBGs actually transmitted in the HARQ window in a downlink mode.

As shown in fig. 2, which are TB-DAI in DCI for scheduling nth downlink transmission in one HARQ window, n =1,2,3,4; and a possible schematic diagram of CBG-DAI in DCI scheduling uplink transmission. As shown in fig. 2, the maximum number of CBGs included in the transport block transmitted by each downlink transmission is preconfigured, the maximum number of CBGs included in the transport block transmitted by the first downlink transmission is 4, the maximum number of CBGs included in the transport block transmitted by the second downlink transmission is 6, the maximum number of CBGs included in the transport block transmitted by the third downlink transmission is 5, and the maximum number of CBGs included in the transport block transmitted by the fourth downlink transmission is 3.

The bit field lengths of the TB-DAI and the CBG-DAI in the DCI are semi-statically configured through high-layer signaling. By adopting the indication mode, the signaling overhead in the DCI can be reduced.

S12, aiming at the hybrid automatic repeat request HARQ window corresponding to the DCI, generating an uplink HARQ codebook according to the following procedures: and sequentially arranging feedback bits corresponding to downlink transmission received in the HARQ window, and filling the rest bits by using a preset value according to the CBG-DAI to obtain an uplink HARQ codebook.

In specific implementation, when the terminal is configured to be in the CBG-based transmission mode, the number of bits fed back by a TB in one HARQ window during initial transmission and retransmission is the same as the number of CBGs sent during initial transmission

In this step, the terminal determines, according to the reception condition of the CBG included in the transport block transmitted by each downlink transmission included in the current HARQ transmission window, the HARQ codebook corresponding to each CBG, for example, if the CBG is received correctly, it determines that the bit value corresponding to the CBG in the HARQ codebook is 1, and if the CBG is not received correctly or not received, it determines that the bit value corresponding to the CBG in the HARQ codebook is 0. Therefore, the terminal can determine the HARQ codebook corresponding to the current HARQ transmission window according to the receiving condition of each downlink transmission in the current HARQ transmission window.

In CBG-DAI transmission mode, the terminal may miss one or more downlink transmissions within the HARQ window. If the terminal only misses one downlink transmission or several continuous downlink transmissions, the terminal can determine the missed downlink transmission for several times according to the value of the TB-DAI bit field, and can correctly position the position of the bit needing to be fed back in the received downlink transmission in the HARQ codebook according to the value of the CBG-DAI bit field.

As shown in fig. 3, according to the CBG-DCI indication, the total length of the HARQ codebook fed back by the terminal to the network side should be 18, the terminal misses the 4 th downlink transmission, and since the first 1, the 2 nd, and the 3 rd downlink transmission terminals have received all the information, where the 1 st downlink transmission includes 4 CBGs, the 1 st CBG is not correctly received, the 2 nd CBG is correctly received, the 3 rd CBG is not correctly received, and the 4 th CBG is correctly received, therefore, the HARQ codebook to be fed back for the 1 st downlink transmission of the current HARQ window is 0101, and in the same way, the terminal can determine, according to the reception conditions of the CBGs included in the transmission blocks transmitted by the 2 nd and the 3 rd downlink transmissions, the HARQ codebooks to be fed back for the 2 nd and the 3 rd downlink transmissions, assuming that the HARQ codebooks to be fed back for the 2 nd and the 3 rd downlink transmissions are 011010 and 01111, and since the 4 th transmission is received, the terminal can determine, according to the CBG-DAI, the HARQ codebook corresponding bit value of 000 and the HARQ bit corresponding to the HARQ bit value in the codebook and the corresponding position of the HARQ bit in the HARQ codebook. Finally, the terminal sequentially arranges the feedback bits corresponding to the downlink transmission received in the current HARQ window to obtain the HARQ codebook 010101001111000 fed back to the network side.

As shown in fig. 4, according to the CBG-DCI indication, the total length of the HARQ codebook fed back to the network side by the terminal should be 18, the terminal misses the downlink transmission for the 2 nd time, similar to the above-mentioned 4 th downlink transmission missed by the terminal, the terminal may determine that the downlink transmission for the 2 nd time is missed according to the indication of TB-DAI, and may determine that the downlink transmission for the 2 nd time includes 5 CBGs according to the CBG-DAI indication field, similarly, the terminal determines, according to the reception condition of the CBGs included in the transmission block transmitted by each downlink transmission, the value of each CBG in the HARQ codebook fed back to the network side and the corresponding position thereof, and determines that the HARQ codebook corresponding to the 2 nd time downlink transmission includes 18 CBGs in total in the HARQ window according to the CBG-DAI, 100012 CBGs have been received, and therefore, it may be determined that there are 6 downlink transmissions, and the HARQ corresponding to the CBG in the HARQ codebook in the HARQ window corresponding to the 2 nd time is 000000, and the HARQ feedback value of the HARQ feedback corresponding to the current HARQ feedback window is obtained by sequentially arranging the HARQ feedback window of the CBG-11100 in the terminal.

As shown in fig. 5, according to the CBG-DCI indication, the total length of the HARQ codebook fed back by the terminal to the network side should be 18, the terminal may miss 2 consecutive downlink transmissions, miss 2 nd downlink transmission and 3 rd downlink transmission, and according to TB-DAI, the terminal may determine that 2 nd downlink transmission and 3 rd downlink transmission are missed, and may determine that 4 CBGs are received in 1 st downlink transmission and 3 CBGs are received in 4 th downlink transmission according to the received 1 st downlink transmission and 4 th downlink transmission, so that the terminal may determine the first 4 bits and the last 3 bits in the fed-back HARQ codebook according to the reception condition of the 1 st downlink transmission and the reception condition of the 4 th downlink transmission, and the middle 11 bits in the HARQ codebook correspond to the 2 nd downlink transmission and the 3 rd downlink transmission, and are all 0 because the terminal does not receive downlink transmissions, and finally, the terminal may sequentially arrange the feedback bits corresponding to the downlink transmissions received in the current HARQ window to obtain 10000100000110 HARQ which is fed back to the network side in sequence.

In specific implementation, if the terminal misses multiple discontinuous downlink transmissions, although it may find that the number of missed transmissions is detected for the number of times through the value of the TB-DAI bit field, it cannot correctly locate the position of the bit to be fed back in the HARQ codebook, as shown in fig. 6, according to the CBG-DCI, the total length of the HARQ codebook fed back to the network side by the terminal should be 18, the terminal misses 2 discontinuous downlink transmissions, which miss 2 nd and 4 th downlink transmissions, and according to the TB-DAI, the terminal may determine that the 2 nd and 4 th downlink transmissions are missed, and may determine that the 1 st downlink transmission receives 4 CBGs and the 3 rd downlink transmission receives 5 CBGs according to the received 1 st downlink transmission and 3 rd downlink transmission, therefore, the terminal may determine that the feedback bit corresponding to the 1 st downlink transmission and the 3 rd downlink transmission in the HARQ codebook fed back and the feedback bit corresponding to the 3 rd downlink transmission are received, and the remaining bits in the HARQ codebook fed back for the terminal do not know the specific number of the HARQ codebook for the 4 nd downlink transmissions, and therefore the terminal cannot determine that the number of the HARQ downlink transmissions corresponding to the 4 nd bits in the HARQ downlink transmissions are not.

In order to solve this problem, in the embodiment of the present invention, when the terminal generates the uplink HARQ feedback codebook, all the received bits that need to be fed back for downlink transmission are sequentially and continuously placed from LSB (least Significant Bit) or MSB (Most Significant Bit), and the remaining bits are complemented by 0, as shown in fig. 7. The manner in which LSB or MSB is employed may be configured by RRC signaling or predefined in the standard.

Based on this, in specific implementation, the terminal may sequentially arrange the feedback bits corresponding to the received downlink transmissions, that is, the feedback bits corresponding to the 1 st downlink transmission and the 3 rd downlink transmission are sequentially arranged in the HARQ codebook, assuming that the feedback bits are fed back in the MSB mode and are 010101101, and the rest bits that are not received are padded with 0, and it may be determined according to the CBG-DAI that the HARQ feedback codebook length should be 18, and the feedback bits corresponding to the 1 st downlink transmission and the 3 rd downlink transmission are 9 bits in total, so that 9 0 s need to be padded in the HARQ feedback codebook, and finally, the feedback bits corresponding to the downlink transmission received in the current HARQ window are sequentially arranged to obtain the HARQ codebook 010101000000000 fed back to the network side. If feedback is carried out in the LSB mode, the final HARQ codebook is 000000000101101010.

Correspondingly, in order to enable the network side to accurately position the receiving condition of the terminal aiming at the downlink transmission in the current HARQ window, in the embodiment of the invention, the terminal can generate a scrambling code sequence based on the receiving condition of the downlink transmission in the HARQ window, and scramble the HARQ codebook fed back to the network side by using the generated scrambling code sequence, so that after the network side receives the HARQ codebook information fed back by the terminal, different scrambling code sequences are tried to descramble, and the CBG corresponding to the bit in the HARQ codebook is determined according to the scrambling code sequence capable of correctly descrambling the received HARQ codebook information.

Based on this, the uplink HARQ codebook feedback method provided in the embodiment of the present invention may further include the following steps:

and S13, generating a scrambling code sequence aiming at the uplink HARQ codebook.

Wherein, the corresponding bit in the scrambling code sequence of each downlink transmission contained in the HARQ window is related to the value of TB-DAI in the DCI.

In specific implementation, before step S11, the following steps may be further included: and receiving DCI for indicating each downlink transmission in the HARQ window, wherein the DCI carries TA-DAI, and the TA-DAI is used for indicating that the downlink transmission is the downlink transmission of the second time in the HARQ window. Based on this, in step S13, the corresponding bit position of the current downlink transmission in the scrambling code sequence may be determined according to the TA-DAI carried in the DCI indicating the current downlink transmission. In specific implementation, for each downlink transmission in the HARQ window, the corresponding bit value in the scrambling code sequence may be set to be the same as the indication value of the TA-DAI field carried in the DCI indicating the downlink transmission.

S14, the uplink HARQ codebook is scrambled by the scrambling code sequence and then sent to a network side.

In specific implementation, two scrambling modes can be adopted, wherein the first mode is to scramble the HARQ codebook first and then calculate the CRC sequence of the HARQ codebook; the other method is to calculate the CRC sequence of the HARQ codebook first, then scramble the CRC sequence, generate the final uplink feedback information after scrambling, and send the final uplink feedback information to the network side.

It should be noted that, in the embodiment of the present invention, the length of the scrambling sequence is a preset value, and the length of the scrambling sequence is not less than the number of downlink transmissions included in the HARQ window. In specific implementation, the length of the scrambling sequence is related to the length of the bit field of the CBG-GAI and the number of the CBGs configured in advance, that is, the length of the scrambling sequence is calculated according to the number of bits of the CBG-DAI bit field in the DCI and the number of the CBGs preconfigured on the corresponding carrier (that is, the carrier transmitting the uplink scheduling DCI). In specific implementation, the length of the scrambling code sequence may be determined according to the length of the CBG-DAI bit field in the DCI and the maximum value of the number of CBGs preconfigured for each downlink transmission included in the HARQ window. For example, the scrambling code sequence length may be determined according to the following formula according to the CBG-DAI bit field length in the DCI and the maximum number of CBGs preconfigured for each downlink transmission included in the HARQ window:

wherein:

n is the length of the CBG-DAI bit field in the DCI;

m is the maximum value of the number of CBGs preconfigured for each downlink transmission contained within the HARQ window.

As shown in fig. 8, assuming that the bit field length of the CBG-DAI is 5 and the number of the pre-configured CBGs is 6, the length of the scrambling sequence can be determined to be 6 according to the above formula.

Correspondingly, an embodiment of the present invention further provides a method for receiving an uplink HARQ codebook, as shown in fig. 9, which may include the following steps:

s91, sending DCI for indicating uplink transmission to a terminal aiming at one HARQ window, wherein the DCI carries CBG-DAI.

And S92, receiving HARQ codebook information fed back by the terminal aiming at the HARQ window, wherein the HARQ codebook information is obtained by scrambling the terminal by using a scrambling code sequence generated by the terminal.

And S93, determining a target scrambling code sequence capable of correctly decoding the HARQ codebook information.

And S94, decoding the HARQ codebook information according to the target scrambling code sequence to obtain the HARQ codebook fed back by the terminal.

And S95, determining a transport block or a code block group CBG which needs to be retransmitted in the HARQ window according to the obtained HARQ codebook.

And the length of the scrambling code sequence is a preset value, and the length of the scrambling code sequence is not less than the downlink transmission times contained in the HARQ window. Based on this, in step S93, different scrambling code sequences may be generated by using the first preset value and the second preset value according to the length of the scrambling code sequence; and respectively trying to decode the HARQ codebook information by using each generated scrambling code sequence until a target scrambling code sequence which can correctly decode the HARQ codebook information is determined. In specific implementation, the first preset value may be 1, and the second preset value may be 0.

Preferably, in a specific implementation, the length of the scrambling code sequence may be determined according to the length of the CBG-DAI bit field in the DCI and a maximum value of the number of CBGs pre-configured for each downlink transmission included in the HARQ window. For example, the DCI may be determined according to the CBG-DAI bit field length and the maximum number of pre-configured CBGs for each downlink transmission included in the HARQ window according to the following formulaLength of scrambling code sequence:

wherein:

n is the length of the CBG-DAI bit field in the DCI;

In specific implementation, if the target scrambling code sequence capable of correctly decoding the HARQ codebook information is not determined, the method further includes:

According to the embodiment of the invention, after receiving HARQ codebook information (scrambled HARQ codebook) fed back by the terminal, the base station tries to descramble different scrambling code sequences. If the CRC passes, the base station determines the receiving condition of each downlink transmission of the terminal according to the corresponding scrambling code sequence, so that the CBG corresponding to the bit in the HARQ codebook is determined. If the base station attempts that all scrambling code sequences fail the CRC check, all CBGs within the HARQ window are considered as either transmission errors (NACKs) or not received (DTX).

In the uplink HARQ codebook feedback and reception method provided in the embodiments of the present invention, when the terminal is configured in a CBG-based transmission mode, the terminal receives DCI for scheduling downlink transmission according to TB-DAI. For DCI scheduled for uplink transmission, the terminal receives the DCI according to CBG-DAI. Aiming at the transmission mode, the embodiment of the invention designs a dynamic HARQ codebook feedback method, the correctly received downlink transmission in the HARQ window needs to be fed back, the bits are arranged in sequence, and the residual bits are complemented by 0. And generating a scrambling code sequence based on the receiving condition of the downlink transmission in the HARQ window, and scrambling the HARQ codebook. The length of the scrambling sequence is related to the number of bits of the CBG-DAI and the number of pre-configured CBGs. According to the uplink HARQ codebook feedback and receiving method provided by the embodiment of the invention, the cost of DCI (downlink control information) transmitted by a scheduling terminal in a CBG (communication based group) transmission mode can be reduced; meanwhile, a dynamic HARQ codebook is supported, compared with a semi-static HARQ codebook, the overhead of UCI can be reduced, and uplink coverage is enhanced; and the condition that the terminal misses the downlink transmission for multiple times and is discontinuous is solved through a scrambling mode. The base station can determine the receiving condition of the downlink transmission in a descrambling mode, and the base station determines that the scrambling code sequence does not need to be decoded again, so that the complexity is reduced.

Based on the same inventive concept, the embodiment of the invention also provides an uplink HARQ codebook feedback device and an uplink HARQ codebook receiving device, and as the principles of the device for solving the problems are respectively similar to the uplink HARQ codebook feedback method and the uplink HARQ codebook receiving method, the implementation of the device can refer to the implementation of the method, and repeated parts are not repeated.

As shown in fig. 10, which is a schematic structural diagram of an uplink HARQ codebook feedback device according to an embodiment of the present invention, the uplink HARQ codebook feedback device includes:

a receiving unit 101, configured to receive downlink control information DCI for indicating uplink transmission, where the DCI carries a code block group downlink configuration index CBG-DAI;

a first generating unit 102, configured to generate an uplink HARQ codebook according to the following procedure for a hybrid automatic repeat request HARQ window corresponding to the DCI: sequentially arranging feedback bits corresponding to downlink transmission received in the HARQ window, and filling other bits with preset values according to the CBG-DAI to obtain an uplink HARQ codebook;

a second generating unit 103, configured to generate a scrambling code sequence for the uplink HARQ codebook;

a sending unit 104, configured to scramble the uplink HARQ codebook with the scrambling code sequence and send the scrambled uplink HARQ codebook to a network side.

Optionally, the second generating unit 103 is specifically configured to, for each downlink transmission included in the HARQ window, determine that a bit corresponding to the downlink transmission in the scrambling code sequence is a first preset value if the downlink transmission is received; and if the downlink transmission is not received, determining that the bit corresponding to the downlink transmission in the scrambling code sequence is a second preset value.

Optionally, the uplink HARQ codebook feedback device further includes:

a first determining unit, configured to determine the scrambling code sequence length according to the CBG-DAI bit field length in the DCI and a maximum value of the number of CBGs preconfigured for each downlink transmission included in an HARQ window.

and the second determining unit is configured to determine, for each downlink transmission in the HARQ window, a bit corresponding to the current downlink transmission in the scrambling sequence according to the TA-DAI carried in the DCI indicating the current downlink transmission.

As shown in fig. 11, an uplink HARQ codebook receiving apparatus provided in an embodiment of the present invention includes:

a sending unit 111, configured to send, to a terminal, DCI for indicating uplink transmission for a HARQ window, where the DCI carries a code block group downlink configuration index CBG-DAI;

a receiving unit 112, configured to receive HARQ codebook information fed back by the terminal for the HARQ window, where the HARQ codebook information is obtained by scrambling the terminal by using a scrambling code sequence generated by the terminal;

a first determining unit 113 configured to determine a target scrambling code sequence capable of correctly decoding the HARQ codebook information;

an obtaining unit 114, configured to decode the HARQ codebook information according to the target scrambling code sequence to obtain a HARQ codebook fed back by the terminal;

a second determining unit 115, configured to determine, according to the obtained HARQ codebook, a transport block or a codebook group CBG that needs to be retransmitted in the HARQ window.

The length of a scrambling code sequence is a preset value, and the length of the scrambling code sequence is not less than the downlink transmission times contained in the HARQ window; and

Optionally, the uplink HARQ codebook receiving apparatus further includes:

For convenience of description, the above parts are separately described as modules (or units) according to functional division. Of course, the functionality of the various modules (or units) may be implemented in the same or in multiple pieces of software or hardware in practicing the invention.

Based on the same technical concept, the embodiment of the present application further provides a communication device, which can implement the uplink HARQ feedback method or the uplink HARQ receiving method in the foregoing embodiments.

Referring to fig. 12, a schematic structural diagram of a communication device according to an embodiment of the present invention is shown in fig. 12, where the communication device may include: a processor 1201, a memory 1202, a transceiver 1203, and a bus interface.

The processor 1201 is responsible for managing a bus architecture and general processing, and the memory 1202 may store data used by the processor 1201 in performing operations. The transceiver 1203 is used to receive and transmit data under the control of the processor 1201.

The bus architecture may include any number of interconnected buses and bridges, with various circuits being linked together in particular by one or more processors, represented by the processor 1201, and by memory, represented by the memory 1202. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, power management circuits, and the like, which are well known in the art, and therefore, will not be described any further herein. The bus interface provides an interface. The processor 1201 is responsible for managing a bus architecture and general processing, and the memory 1202 may store data used by the processor 1201 in performing operations.

The process disclosed by the embodiment of the invention can be applied to the processor 1201, or can be implemented by the processor 1201. In implementation, the steps of the signal processing flow may be implemented by integrated logic circuits of hardware or instructions in the form of software in the processor 1201. The processor 1201 may be a general purpose processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or the like that may implement or perform the methods, steps, and logic blocks disclosed in embodiments of the present invention. The general purpose processor may be a microprocessor or any conventional processor or the like. The steps of a method disclosed in connection with the embodiments of the present invention may be directly implemented by a hardware processor, or may be implemented by a combination of hardware and software modules in the processor. The software modules may be located in ram, flash, rom, prom, or eprom, registers, etc. as is well known in the art. The storage medium is located in the memory 1202, and the processor 1201 reads information in the memory 1202 and completes the steps of the signal processing flow in conjunction with hardware thereof.

Specifically, the processor 1201 is configured to read a program in a memory, and execute any step of the uplink HARQ codebook feedback method or the uplink HARQ codebook receiving method.

Based on the same technical concept, the embodiment of the application also provides a computer storage medium. The computer-readable storage medium stores computer-executable instructions for causing the computer to perform any one of the steps of the aforementioned uplink HARQ codebook feedback method or uplink HARQ codebook receiving method.

As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including the preferred embodiment and all changes and modifications that fall within the scope of the invention.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. An uplink HARQ codebook feedback method is characterized by comprising the following steps:

generating an uplink HARQ codebook according to the following process aiming at a hybrid automatic repeat request (HARQ) window corresponding to the DCI: sequentially arranging feedback bits corresponding to downlink transmission received in the HARQ window, and supplementing the rest bits by using a preset value according to the CBG-DAI to obtain an uplink HARQ codebook;

generating a scrambling code sequence for the uplink HARQ codebook;

the uplink HARQ codebook is scrambled by the scrambling code sequence and then sent to a network side;

generating a scrambling code sequence for the uplink HARQ codebook specifically comprises:

2. The method of claim 1, wherein the length of the scrambling sequence is a predetermined value, and the length of the scrambling sequence is not less than the number of downlink transmissions included in the HARQ window.

3. The method of claim 2, wherein the scrambling code sequence length is determined according to the following method:

and determining the length of the scrambling code sequence according to the length of the CBG-DAI bit field in the DCI and the maximum value of the number of CBGs which are pre-configured for each downlink transmission contained in an HARQ window.

4. The method of claim 1, wherein before receiving Downlink Control Information (DCI) indicating uplink transmission, further comprising:

5. An uplink HARQ codebook receiving method, comprising:

determining a transmission block or a code block group CBG which needs to be retransmitted in the HARQ window according to the obtained HARQ codebook;

wherein, the determining the target scrambling code sequence capable of correctly decoding the HARQ codebook information specifically includes:

6. The method of claim 5, wherein the length of the scrambling sequence is a predetermined value, and the length of the scrambling sequence is not less than the number of downlink transmissions included in the HARQ window.

7. The method of claim 6, wherein the scrambling code sequence length is determined according to the following method:

8. The method of claim 5, 6 or 7, wherein if a target scrambling sequence that can correctly decode the HARQ codebook information is not determined, the method further comprises:

9. An uplink HARQ codebook feedback device, comprising:

a first generating unit, configured to generate an uplink HARQ codebook for a hybrid automatic repeat request HARQ window corresponding to the DCI, where feedback bits corresponding to downlink transmissions received in the HARQ window are sequentially arranged, and the remaining bits are filled with a preset value according to the CBG-DAI to obtain the uplink HARQ codebook;

a sending unit, configured to scramble the uplink HARQ codebook by using the scrambling code sequence and send the scrambled uplink HARQ codebook to a network side;

the second generating unit is specifically configured to determine, for each downlink transmission included in the HARQ window, that a bit corresponding to the downlink transmission in the scrambling code sequence is a first preset value if the downlink transmission is received; and if the downlink transmission is not received, determining that the bit corresponding to the downlink transmission in the scrambling code sequence is a second preset value.

10. The apparatus of claim 9, wherein the length of the scrambling sequence is a predetermined value, and the length of the scrambling sequence is not less than the number of downlink transmissions included in the HARQ window.

11. The apparatus of claim 10, further comprising:

12. The apparatus as claimed in claim 9, further comprising a second determining unit, wherein:

13. An uplink HARQ codebook receiving apparatus, comprising:

a second determining unit, configured to determine, according to the obtained HARQ codebook, a transport block or a codebook group CBG that needs to be retransmitted in the HARQ window;

14. The apparatus of claim 13, wherein the length of the scrambling sequence is a predetermined value, and the length of the scrambling sequence is not less than the number of downlink transmissions included in the HARQ window.

15. The apparatus of claim 14, further comprising:

16. A communications apparatus, comprising: a processor, a memory, and a transceiver; wherein the memory stores a computer program and the processor, reading the program in the memory, performs the method of any of claims 1 to 8.

17. A computer storage medium having computer-executable instructions stored thereon for causing a computer to perform the method of any one of claims 1 to 8.