CN111294186A

CN111294186A - HARQ-ACK codebook feedback method, user terminal and computer readable storage medium

Info

Publication number: CN111294186A
Application number: CN201910361764.6A
Authority: CN
Inventors: 张飒
Original assignee: Beijing Spreadtrum Hi Tech Communications Technology Co Ltd
Current assignee: Beijing Spreadtrum Hi Tech Communications Technology Co Ltd
Priority date: 2019-04-30
Filing date: 2019-04-30
Publication date: 2020-06-16
Anticipated expiration: 2039-04-30
Also published as: CN111294186B

Abstract

A HARQ-ACK codebook feedback method, a user terminal and a computer readable storage medium, the method comprising: detecting whether an overlapped PDSCH exists in a time domain corresponding to a downlink time slot needing to feed back an HARQ-ACK codebook; when overlapped PDSCHs are detected to exist, HARQ-ACK feedback corresponding to each PDSCH in the overlapped PDSCHs and HARQ-ACK feedback corresponding to other non-overlapped PDSCHs are respectively obtained, and HARQ-ACK codebooks are generated and sent; the HARQ-ACK codebook comprises a first sub-codebook and a second sub-codebook, wherein: the first sub-codebook comprises HARQ-ACK feedbacks corresponding to the other non-overlapping PDSCHs and HARQ-ACK feedbacks corresponding to one PDSCH in the overlapping PDSCHs; the second sub-codebook includes HARQ-ACK feedbacks corresponding to other PDSCHs of the overlapped PDSCHs. By adopting the scheme, the HARQ-ACK feedback of the overlapped PDSCHs by the user terminal can be realized.

Description

HARQ-ACK codebook feedback method, user terminal and computer readable storage medium

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a HARQ-ACK codebook feedback method, a user terminal, and a computer-readable storage medium.

Background

Enhanced Mobile bandwidth (eMBB) and ultra-high reliability low-latencyTime of flight Communication (URLLC) is the third generation partnership project (3)^rdGeneration Partnership Project, 3 GPP). URLLC service has high requirements for delay and reliability, and requires allocating a large bandwidth for URLLC. Because the URLLC service has the characteristics of burstiness and sparseness, if all bandwidths are allocated only to the URLLC service, serious waste of spectrum resources can be caused when there is no URLLC service, so that the utilization rate of spectrum resources is low. In order to improve the utilization rate of frequency spectrum resources, the URLLC service and the eMBB service may multiplex frequency spectrum resources.

Because the delay requirements of the eMBB service and the URLLC service are different, and the service characteristics are also different, the URLLC service is generally scheduled by using a smaller Transmission Time Interval (TTI), and the eMBB service is generally scheduled by using a larger TTI. Because the scheduling granularity of the eMMC service and the URLLC service is different, the URLLC service can arrive at a certain intermediate time of eMMC service transmission, and the URLLC service transmission is preferentially ensured in order to ensure the reliability and low time delay requirement of the URLLC service.

In the prior art, when the URLLC service arrives at a certain intermediate time of the eMBB service transmission, the base station may stop transmitting the eMBB service data and transmit the URLLC service data. When a downlink eMBB Physical Downlink Shared Channel (PDSCH) and a URLLC PDSCH overlap in a time domain, a user terminal needs to perform HARQ-ACK feedback on both PDSCHs.

The semi-static HARQ-ACK codebook for New Radio (NR) R15 supports PDSCH feedback without overlapping in the time domain. When the eMBB PDSCH and the URLLC PDSCH are overlapped on the time domain, the user terminal cannot perform HARQ-ACK feedback on the two PDSCHs.

Disclosure of Invention

The embodiment of the invention solves the problem that when overlapped PDSCHs exist in a certain downlink time slot, the user terminal can not realize HARQ-ACK feedback on the overlapped PDSCHs.

In order to solve the above technical problem, an embodiment of the present invention provides a HARQ-ACK codebook feedback method, including: detecting whether an overlapped PDSCH exists in a time domain corresponding to a downlink time slot needing to feed back an HARQ-ACK codebook; when overlapped PDSCHs are detected to exist, HARQ-ACK feedback corresponding to each PDSCH in the overlapped PDSCHs and HARQ-ACK feedback corresponding to other non-overlapped PDSCHs are respectively obtained, and HARQ-ACK codebooks are generated and sent; the HARQ-ACK codebook comprises a first sub-codebook and a second sub-codebook, wherein: the first sub-codebook comprises HARQ-ACK feedbacks corresponding to the other non-overlapping PDSCHs and HARQ-ACK feedbacks corresponding to one PDSCH in the overlapping PDSCHs; the number of PDSCHs corresponding to the first sub-codebook is KxM, wherein M is the number of PDSCHs which are not overlapped in each downlink time slot in the time domain; the second sub-codebook comprises HARQ-ACK feedbacks corresponding to other PDSCHs in the overlapped PDSCHs; the number of PDSCHs corresponding to the second sub-codebook is K × N, N is the number of overlapped PDSCHs corresponding to each preconfigured downlink timeslot, N is a positive integer, K is the number of downlink timeslots corresponding to one uplink transmission time interval determined according to a preconfigured K1 set and uplink and downlink subcarrier intervals, and K1 is used for indicating the number of timeslots of downlink data and time intervals for HARQ-ACK feedback thereof.

Optionally, N ═ 1 or 2.

Optionally, the overlapped PDSCH includes a high priority PDSCH and a low priority PDSCH.

Optionally, the PDSCH corresponding to HARQ-ACK feedback in the second sub-codebook is: a high priority PDSCH of the overlapping PDSCHs.

Optionally, the PDSCH corresponding to HARQ-ACK feedback in the second sub-codebook is: a low priority PDSCH of the overlapping PDSCHs.

Optionally, the generating the HARQ-ACK codebook includes: when the position of HARQ-ACK feedback corresponding to any two PDSCHs in the overlapped PDSCHs in the first sub-codebook is detected to be the same, the HARQ-ACK feedback corresponding to the PDSCH with low priority in any two PDSCHs is put into the first sub-codebook, and the HARQ-ACK feedback corresponding to the PDSCH with high priority in any two PDSCHs is put into the second sub-codebook; or, putting the HARQ-ACK feedback corresponding to the PDSCH with the high priority in the two arbitrary PDSCHs into the first sub-codebook, and putting the HARQ-ACK feedback corresponding to the PDSCH with the low priority in the two arbitrary PDSCHs into the second sub-codebook.

Optionally, the first sub-codebook is located before the second sub-codebook; or, the first sub-codebook is located after the second sub-codebook.

An embodiment of the present invention further provides a user terminal, including: the detection unit is used for detecting whether an overlapped PDSCH exists in a time domain corresponding to a downlink time slot needing to be fed back to the HARQ-ACK codebook; a generating unit, configured to, when overlapping PDSCHs are detected to exist, respectively obtain HARQ-ACK feedback corresponding to each PDSCH in the overlapping PDSCHs and HARQ-ACK feedback corresponding to other non-overlapping PDSCHs, and generate a HARQ-ACK codebook; a transmitting unit, configured to transmit the HARQ-ACK codebook; the HARQ-ACK codebook comprises a first sub-codebook and a second sub-codebook, wherein: the first sub-codebook comprises HARQ-ACK feedbacks corresponding to the other non-overlapping PDSCHs and HARQ-ACK feedbacks corresponding to one PDSCH in the overlapping PDSCHs; the number of PDSCHs corresponding to the first sub-codebook is KxM, wherein M is the number of PDSCHs which are not overlapped in each downlink time slot in the time domain; the second sub-codebook comprises HARQ-ACK feedbacks corresponding to other PDSCHs in the overlapped PDSCHs; the number of PDSCHs corresponding to the second sub-codebook is K × N, N is the number of overlapped PDSCHs corresponding to each preconfigured downlink timeslot, and N is a positive integer, K is the number of downlink timeslots corresponding to one uplink transmission time interval determined according to a preconfigured K1 set and uplink and downlink subcarrier intervals, and K1 is used for indicating the number of timeslots of downlink data and time intervals for HARQ-ACK feedback thereof.

Optionally, N ═ 1 or 2.

Optionally, the generating unit is configured to, when it is detected that, in the overlapped PDSCHs, positions of HARQ-ACK feedbacks corresponding to any two PDSCHs in the first sub-codebook are the same, put HARQ-ACK feedbacks corresponding to a low-priority PDSCH in the any two PDSCHs into the first sub-codebook, and put HARQ-ACK feedbacks corresponding to a high-priority PDSCH in the any two PDSCHs into the second sub-codebook; or, putting the HARQ-ACK feedback corresponding to the PDSCH with the high priority in the two arbitrary PDSCHs into the first sub-codebook, and putting the HARQ-ACK feedback corresponding to the PDSCH with the low priority in the two arbitrary PDSCHs into the second sub-codebook.

The embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium is a non-volatile storage medium or a non-transitory storage medium, and has computer instructions stored thereon, and when the computer instructions are executed, the method performs any of the above steps of the HARQ-ACK codebook feedback method.

The embodiment of the invention also provides a user terminal, which comprises a memory and a processor, wherein the memory stores computer instructions capable of being operated on the processor, and the processor executes any one of the steps of the HARQ-ACK codebook feedback method when operating the computer instructions.

Compared with the prior art, the technical scheme of the embodiment of the invention has the following beneficial effects:

when detecting that overlapped PDSCHs exist on a time domain corresponding to a downlink time slot needing to feed back an HARQ-ACK codebook, respectively obtaining HARQ-ACK feedback corresponding to non-overlapped PDSCHs and HARQ-ACK feedback corresponding to each PDSCH in the overlapped PDSCHs, and generating the HARQ-ACK codebook. The HARQ-ACK codebook comprises a first sub-codebook and a second sub-codebook, the first sub-codebook comprises HARQ-ACK feedback corresponding to non-overlapped PDSCH and HARQ-ACK feedback corresponding to one PDSCH in overlapped PDSCH, and the second sub-codebook comprises HARQ-ACK feedback corresponding to other PDSCHs in overlapped PDSCH. And by adding a second sub-codebook for HARQ-ACK feedback corresponding to other PDSCHs in the overlapped PDSCHs, HARQ-ACK feedback is carried out on the overlapped PDSCHs.

Drawings

Fig. 1 is a flowchart of a HARQ-ACK codebook feedback method in an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a user terminal in an embodiment of the present invention.

Detailed Description

In the prior art, a semi-static HARQ-ACK codebook of a New Radio (NR) R15 supports PDSCH feedback without overlapping in the time domain. When the eMBB PDSCH and the URLLC PDSCH are overlapped on the time domain, the user terminal cannot perform HARQ-ACK feedback on the two PDSCHs. In practical applications, it is known that the priority of the eMBB service is different from that of the URLLC service, and the priority of the URLLC service is higher than that of the eMBB service.

In the embodiment of the invention, the HARQ-ACK codebook comprises a first sub-codebook and a second sub-codebook, the first sub-codebook comprises HARQ-ACK feedbacks corresponding to non-overlapped PDSCHs and HARQ-ACK feedbacks corresponding to one PDSCH in overlapped PDSCHs, and the second sub-codebook comprises HARQ-ACK feedbacks corresponding to other PDSCHs in overlapped PDSCHs. And by adding a second sub-codebook for HARQ-ACK feedback corresponding to other PDSCHs in the overlapped PDSCHs, HARQ-ACK feedback is carried out on the overlapped PDSCHs.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.

An embodiment of the present invention provides a HARQ-ACK codebook feedback method, which is described in detail below with reference to fig. 1 through specific steps.

Step S101, detecting whether there is overlapped PDSCH on the time domain corresponding to the downlink time slot needing to feed back the HARQ-ACK codebook.

In specific implementation, the ue may detect whether there is an overlapped PDSCH in a time domain corresponding to a downlink timeslot where the HARQ-ACK codebook needs to be fed back. Step S102 may be performed when the user terminal detects the presence of overlapping PDSCHs.

In a specific implementation, the existence of the overlapped PDSCH in the time domain corresponding to the downlink time slot means that there is a conflicting service in the downlink time slot. For example, in a certain downlink timeslot, the user terminal receives the eMBB service and the URLLC service at the same time, and at this time, there is an overlapped PDSCH in the downlink time domain.

Step S102, when overlapped PDSCHs are detected to exist, HARQ-ACK feedback corresponding to each PDSCH in the overlapped PDSCHs and HARQ-ACK feedback corresponding to other non-overlapped PDSCHs are respectively obtained, and HARQ-ACK codebooks are generated and sent.

In specific implementation, when it is detected that there is an overlapped PDSCH corresponding to a time slot in which a HARQ-ACK codebook needs to be fed back, HARQ-ACK feedback corresponding to each non-overlapped PDSCH and HARQ-ACK feedback corresponding to each PDSCH in the overlapped PDSCH may be respectively obtained. And generating a corresponding HARQ-ACK codebook according to the obtained HARQ-ACK feedback. After generating the HARQ-ACK codebook, the HARQ-ACK codebook may be transmitted to a base station.

In a specific implementation, the generated HARQ-ACK codebook may include a first sub-codebook and a second sub-codebook, where: the first sub-codebook may include HARQ-ACK feedback for non-overlapping PDSCHs and HARQ-ACK for one of the overlapping PDSCHs; the number of PDSCHs corresponding to the first sub-codebook is KxM, wherein M is the number of PDSCHs which are not overlapped in the time domain of each downlink time slot;

the second sub-codebook may include HARQ-ACK feedback corresponding to other PDSCHs in the overlapping PDSCHs; the number of PDSCHs corresponding to the second sub-codebook is K × N, N is the number of overlapped PDSCHs corresponding to each preconfigured downlink timeslot, N is a positive integer, K is the number of downlink timeslots corresponding to one uplink Transmission Time Interval (TTI) determined according to the preconfigured K1 set and the uplink and downlink subcarrier intervals, and K1 is used to indicate the number of timeslots of downlink data and the Time Interval of HARQ-ACK feedback thereof.

For example, the ue detects PDSCHs corresponding to a certain downlink slot requiring feedback of the HARQ-ACK codebook, which are overlapped in time domain, and the PDSCHs are 1 and 2, respectively. Then the first sub-codebook includes HARQ-ACK feedback corresponding to PDSCH1 and the second sub-codebook includes HARQ-ACK feedback corresponding to PDSCH2 when generating the HARQ-ACK codebook.

In a specific implementation, the K value may be determined according to a pre-configured K1 set and an uplink and downlink subcarrier interval by using an existing protocol, and a specific operation method for determining the K value is not described in detail herein.

In a specific implementation, the HARQ-ACK feedback is located in the overlapped PDSCH in the first sub-codebook, which may be the lowest priority PDSCH in the overlapped PDSCH, and the HARQ-ACK feedback corresponding to other PDSCHs in the overlapped PDSCH is located in the second sub-codebook.

In a specific implementation, the HARQ-ACK feedback is located in the overlapped PDSCH in the first sub-codebook, which may be the highest priority PDSCH in the overlapped PDSCH, and the HARQ-ACK feedback corresponding to other PDSCHs in the overlapped PDSCH is located in the second sub-codebook.

In practical application, the HARQ-ACK feedback corresponding to the PDSCH with the highest priority in the overlapped PDSCHs may be set in the first sub-codebook, or the HARQ-ACK feedback corresponding to the PDSCH with the lowest priority in the overlapped PDSCHs may be set in the first sub-codebook.

In a specific implementation, as known from the conventional NR 15 semi-static codebook, if the number of PDSCHs that do not overlap in the time domain per downlink slot is 3, the number of PDSCHs corresponding to the first sub-codebook is 3 × K.

In specific implementation, the value of N may be 1, 2, or other positive integers.

When N is greater than or equal to 2, one downlink timeslot may be divided into N sub-timeslots, and for each sub-timeslot, one bit may be used to feed back HARQ-ACK feedback.

In this embodiment, when N is 1, it means that there are 2 PDSCHs in a certain downlink slot, that is, there is an overlap between PDSCHs in the downlink slot.

In the embodiment of the present invention, when 2 or more PDSCHs exist on one downlink slot, the overlapped PDSCHs may include a high-priority PDSCH and a low-priority PDSCH.

In a specific implementation, the PDSCH corresponding to the HARQ-ACK feedback in the second sub-codebook may be a high-priority PDSCH in the overlapped PDSCH, and the PDSCH corresponding to the HARQ-ACK feedback in the second sub-codebook may also be a low-priority PDSCH in the overlapped PDSCH.

In other words, when there is a high-priority PDSCH or a low-priority PDSCH in a certain downlink slot, the HARQ-ACK feedback in the second sub-codebook may be the HARQ-ACK feedback of the high-priority PDSCH or the HARQ-ACK feedback of the low-priority PDSCH.

In a particular implementation, the low priority PDSCH may be an eMBB PDSCH and the high priority PDSCH may be a URLLC PDSCH.

In a specific implementation, when there are overlapping PDSCHs, it may also be detected whether there is a PDSCH in the overlapping PDSCHs with the same position in the first sub-codebook for the corresponding HARQ-ACK feedback. When the corresponding HARQ-ACK feedback is detected to exist in the PDSCH with the same position in the first sub-codebook, the HARQ-ACK feedback corresponding to the PDSCH with low priority can be put into the first sub-codebook, and the HARQ-ACK feedback corresponding to the PDSCH with high priority can be put into the second sub-codebook; or the HARQ-ACK feedback corresponding to the PDSCH with high priority may be put into the first sub-codebook, and the HARQ-ACK feedback corresponding to the PDSCH with low priority may be put into the second sub-codebook.

For example, the user terminal detects that there are overlapped PDSCHs corresponding to a certain downlink slot of the HARQ-ACK codebook that needs to be fed back, which are PDSCH1 and PDSCH2, respectively, and the HARQ-ACK feedback corresponding to PDSCH1 is the same as the HARQ-ACK feedback corresponding to PDSCH2 in the position of the first sub-codebook, and the priority of PDSCH1 is lower than the priority of PDSCH 2. When generating the HARQ-ACK codebook, the first sub-codebook includes HARQ-ACK feedback corresponding to PDSCH1, and the second sub-codebook includes HARQ-ACK feedback corresponding to PDSCH 2.

In a specific implementation, when the HARQ-ACK codebook is generated, the first sub-codebook and the second sub-codebook may be further sorted. The first sub-codebook may be disposed before the second sub-codebook, and the first sub-codebook may be disposed after the second sub-codebook. In practical application, the order of the first sub-codebook and the second sub-codebook may be set according to practical application requirements.

The HARQ-ACK codebook feedback method provided in the above embodiments of the present invention is described below by an example.

The method comprises the steps that a semi-static codebook is configured for a user terminal, the capability of simultaneously receiving URLLC services and eMB services is achieved, the URLLC services and the eMB services use the same semi-static codebook for feedback, and a physical layer can distinguish the URLLC services from the eMB services. The high priority PDSCH is URLLCPDSCH and the low priority PDSCH is eMBB PDSCH.

The base station configures N to 1 through high-layer signaling, that is, the base station configures the number N of PDSCHs allowed by each downlink timeslot and that can be overlapped to 1. The base station configures the set of K1 to be {1, 2, 3} through higher layer signaling. The time domain resource allocation table is shown in table 1 below:

TABLE 1 time domain resource Allocation Table

Indexing	Starting OFDM symbol	OFDM symbol length
			0	0	4
1	4	4
			2	8	4
3	0	14

The uplink and downlink Subcarrier Spacing (SCS) is 15KHz, i.e. the length of the uplink time slot is equal to that of the downlink time slot, and each PDSCH is fed back with 1 bit.

According to the existing NR 15 semi-static codebook, the number of PDSCHs that do not overlap per downlink slot is 3. In table 1, index 3 and index 0 correspond to possible positions of the same PDSCH. The PDSCH on slot n-3, slot n-2, and slot n-1 needs to be fed back in slot n, that is, the number of the PDSCH corresponding to the first sub-codebook is 3 × 3 — 9, and 9 bits are needed altogether. According to the time sequence, the first bit in the first sub-codebook corresponds to the index 0 or the index 3 of the slot n-3, the second bit corresponds to the index 1 of the slot n-3, the third bit corresponds to the index 2 of the slot n-3, the fourth bit corresponds to the index 0 or the index 3 of the slot n-2, the fifth bit corresponds to the index 1 of the slot n-2, the sixth bit corresponds to the index 2 of the slot n-2, the seventh bit corresponds to the index 0 or the index 3 of the slot n-1, the eighth bit corresponds to the index 1 of the slot n-1, and the ninth bit corresponds to the index 2 of the slot n-1.

Since N is 1, 3 bits need to be added to feed back the overlapped URLLC PDSCHs, that is, the number of PDSCHs corresponding to the second sub-codebook is 3. According to time sequencing, the first bit in the second sub-codebook corresponds to slot n-3, the second bit corresponds to slot n-2, and the third bit corresponds to slot n-1. A user terminal receives an eBBPDSCH corresponding index 3 and a URLLC PDSCH corresponding index 0 in slot n-3; receiving an eMBB PDSCH corresponding index 3 and a URLLC PDSCH corresponding index 1 in slot n-2; and receiving a corresponding index 2 of the URLLC PDSCH in slot n-1, wherein the URLLC PDSCH is successfully decoded, and the eMBB PDSCH is failed to decode.

The first sub-codebook is 000000001, the first bit is HARQ-ACK feedback corresponding to eMBB PDSCH of slot n-3, the fourth bit is HARQ-ACK feedback corresponding to eMBB PDSCH of slot n-2, and the ninth bit is HARQ-ACK feedback corresponding to URLLC PDSCH of slot n-1. And the possible positions of other PDSCHs do not receive data, the HARQ-ACK feedback is NACK when the bit value is 0, and the HARQ-ACK feedback is ACK when the bit value is 1.

The second sub-codebook is 110, the first bit is HARQ-ACK feedback of URLLC PDSCH of slot n-3, the second bit is HARQ-ACK feedback of URLLC PDSCH of slot n-2, and the third bit is NACK feedback. The first sub-codebook is arranged before the second sub-codebook, and the obtained HARQ-ACK codebook is as follows: 000000001110.

the HARQ-ACK codebook feedback method provided in the above embodiment of the present invention is explained by another example.

The base station configures N to 1 through high-layer signaling, that is, the base station configures the number N of PDSCHs allowed by each downlink timeslot and that can be overlapped to 1. The base station configures the set of K1 to be {1, 2, 3} through higher layer signaling. The time domain resource allocation table is shown in table 2 below:

TABLE 2 time domain resource Allocation Table

Indexing	Starting OFDM symbol	OFDM symbol length
			0	0	4
1	4	4
			2	8	4
3	0	14

The uplink and downlink Subcarrier Spacing (SCS) are both 15KHz, i.e. the length of the uplink timeslot is equal to that of the downlink timeslot. Each PDSCH is fed back with 1 bit.

Since N is 1, 3 bits need to be added to feed back the overlapped URLLC PDSCHs, that is, the number of PDSCHs corresponding to the second sub-codebook is 3. According to time sequencing, the first bit in the second sub-codebook corresponds to slot n-3, the second bit corresponds to slot n-2, and the third bit corresponds to slot n-1. The user terminal receives an eMBBBPDSCH corresponding index 3 and a URLLCPDSCH corresponding index 0 in slot n-3; receiving an eMBB PDSCH corresponding index 3 and a URLLC PDSCH corresponding index 1 in slot n-2; and receiving a corresponding index 2 of the URLLC PDSCH in slot n-1, wherein the URLLC PDSCH is successfully decoded, and the eMBB PDSCH is failed to decode.

The first sub-codebook is 000010001, wherein the first bit is HARQ-ACK feedback corresponding to eBB PDSCH of slot n-3, the fourth bit is HARQ-ACK feedback corresponding to eBB PDSCH of slot n-2, the fifth bit is HARQ-ACK feedback corresponding to URLLC PDSCH of slot n-2, and the ninth bit is HARQ-ACK feedback corresponding to URLLC PDSCH of slot n-1. And the possible positions of other PDSCHs do not receive data, the HARQ-ACK feedback is NACK when the bit value is 0, and the HARQ-ACK feedback is ACK when the bit value is 1.

The second sub-codebook is 100, the first bit is HARQ-ACK feedback of URLLC PDSCH of slot n-3, and the second bit and the third bit are fed back as NACK. The first sub-codebook is arranged before the second sub-codebook, and the obtained HARQ-ACK codebook is as follows: 000010001100.

although the eMBB PDSCH and the URLLC PDSCH are overlapped in the slot n-2 in the time domain, the positions of the NR R15 semi-static codebooks corresponding to the eMBB PDSCH and the overlapped URLLC PDSCH are different, so that feedback in the second sub codebook is not needed.

The base station configures N-2 through high-layer signaling. The high-level signaling configures a downlink time slot into two sub-time slots, wherein the first sub-time slot corresponds to OFDM symbols 0-6, and the second sub-time slot corresponds to OFDM symbols 7-13.

The base station configures the set of K1 to be {1, 2, 3} through higher layer signaling. The time domain resource allocation table is shown in table 3 below:

TABLE 3 time domain resource Allocation Table

Indexing	Starting OFDM symbol	OFDM symbol length
			0	0	4
1	4	4
			2	8	4
3	0	14

According to the existing NR 15 semi-static codebook, the number of PDSCHs that do not overlap per downlink slot is 3. In table 3, index 3 and index 0 correspond to possible positions of the same PDSCH. The PDSCH on slot n-3, slot n-2, and slot n-1 needs to be fed back in slot n, that is, the number of the PDSCH corresponding to the first sub-codebook is 3 × 3 — 9, and 9 bits are needed altogether. According to the time sequence, the first bit in the first sub-codebook corresponds to the index 0 or the index 3 of the slot n-3, the second bit corresponds to the index 1 of the slot n-3, the third bit corresponds to the index 2 of the slot n-3, the fourth bit corresponds to the index 0 or the index 3 of the slot n-2, the fifth bit corresponds to the index 1 of the slot n-2, the sixth bit corresponds to the index 2 of the slot n-2, the seventh bit corresponds to the index 0 or the index 3 of the slot n-1, the eighth bit corresponds to the index 1 of the slot n-1, and the ninth bit corresponds to the index 2 of the slot n-1.

Since N is 2, 6 bits need to be added to feed back the overlapped URLLC PDSCHs, that is, the number of PDSCHs corresponding to the second sub-codebook is 6. According to the time sequence, the first bit in the second sub-codebook corresponds to the URLLC PDSCH of the first sub-slot in slot n-3, the second bit corresponds to the URLLC PDSCH of the second sub-slot in slot n-3, the third bit corresponds to the URLLC PDSCH of the first sub-slot in slot n-2, the fourth bit corresponds to the URLLC PDSCH of the second sub-slot in slot n-2, the fifth bit corresponds to the URLLC CPDSCH of the first sub-slot in slot n-1, and the sixth bit corresponds to the URLLC PDSCH of the second sub-slot in slot n-1.

A user terminal receives an eMBB PDSCH corresponding index 3 at slot n-3, and receives 2 URLLC PDSCHs corresponding indexes 0 and 2; receiving an eMBB PDSCH corresponding index 3 and a URLLCPDSCH corresponding index 1 in slot n-2; and receiving a URLLC PDSCH corresponding to index 2 in slot n-1. The URLLC PDSCHs are decoded successfully, and the eMBB PDSCHs are decoded unsuccessfully.

The first sub-codebook is 001010001, wherein the first bit is HARQ-ACK feedback corresponding to eMBSFN PDSCH of slot n-3, the third bit is HARQ-ACK feedback corresponding to index 2 of URLLC PDSCH of slot n-3, the fourth bit is HARQ-ACK feedback corresponding to eMBSFN PDSCH of slot n-2, the fifth bit is HARQ-ACK feedback of URLLC PDSCH of slot n-2, and the ninth bit is HARQ-ACK feedback corresponding to URLLC PDSCH of slot n-1. And the possible positions of other PDSCHs do not receive data, the HARQ-ACK feedback is NACK when the bit value is 0, and the HARQ-ACK feedback is ACK when the bit value is 1.

The second sub-codebook is 100000, the first bit is HARQ-ACK feedback of URLLC PDSCH (index 0) of slot n-3, and the rest bits are used for feeding back NACK by default. The first sub-codebook is positioned behind the second sub-codebook, and the obtained HARQ-ACK codebook is as follows: 100000001010001. HARQ-ACK feedback for URLLC PDSCH (index 0) with slot n-3 as the first bit, i.e.: the URLLC PDSCH of slot n-3 corresponds to HARQ-ACK feedback with index 0.

In a specific implementation, the uplink SCS and the downlink SCS in the above three examples are the same. It can be understood that, for the case that uplink and downlink SCS are different, the determined K values may be different, but the second sub-codebook still corresponds to HARQ-ACK feedback corresponding to other PDSCHs in the overlapped PDSCH, and therefore, the HARQ-ACK codebook feedback method provided in the embodiment of the present invention may still be used for HARQ-ACK codebook feedback, which is not described in detail herein.

Referring to fig. 2, a user terminal 20 in the real-time embodiment of the present invention is shown, which includes: a detection unit 201, a generation unit 202, and a transmission unit 203, wherein:

a detecting unit 201, configured to detect whether there is an overlapped PDSCH in a time domain corresponding to a downlink timeslot where an HARQ-ACK codebook needs to be fed back;

a generating unit 202, configured to, when overlapping PDSCHs are detected to exist, respectively obtain HARQ-ACK feedback corresponding to each PDSCH in the overlapping PDSCHs and HARQ-ACK feedback corresponding to other non-overlapping PDSCHs, and generate a HARQ-ACK codebook;

a transmitting unit 203, configured to transmit the HARQ-ACK codebook;

the HARQ-ACK codebook comprises a first sub-codebook and a second sub-codebook, wherein: the first sub-codebook comprises HARQ-ACK feedbacks corresponding to the other non-overlapping PDSCHs and HARQ-ACK feedbacks corresponding to one PDSCH in the overlapping PDSCHs; the number of PDSCHs corresponding to the first sub-codebook is KxM, wherein M is the number of PDSCHs which are not overlapped in each downlink time slot in the time domain; the second sub-codebook comprises HARQ-ACK feedbacks corresponding to other PDSCHs in the overlapped PDSCHs; the number of PDSCHs corresponding to the second sub-codebook is K × N, N is the number of overlapped PDSCHs corresponding to each preconfigured downlink timeslot, and N is a positive integer, K is the number of downlink timeslots corresponding to one uplink transmission time interval determined according to a preconfigured K1 set and uplink and downlink subcarrier intervals, and K1 is used for indicating the number of timeslots of downlink data and time intervals for HARQ-ACK feedback thereof.

In specific implementations, N is 1 or 2.

In a particular implementation, the overlapping PDSCHs may include a high priority PDSCH and a low priority PDSCH.

In a specific implementation, the PDSCH corresponding to HARQ-ACK feedback in the second sub-codebook may be: a high priority PDSCH of the overlapping PDSCHs.

In a specific implementation, the PDSCH corresponding to HARQ-ACK feedback in the second sub-codebook may be: a low priority PDSCH of the overlapping PDSCHs.

In a specific implementation, the generating unit 202 may be configured to, when it is detected that, of the overlapped PDSCHs, positions of HARQ-ACK feedbacks corresponding to any two PDSCHs in the first sub-codebook are the same, put HARQ-ACK feedback corresponding to a low-priority PDSCH of the any two PDSCHs into the first sub-codebook, and put HARQ-ACK feedback corresponding to a high-priority PDSCH of the any two PDSCHs into the second sub-codebook; or, putting the HARQ-ACK feedback corresponding to the PDSCH with the high priority in the two arbitrary PDSCHs into the first sub-codebook, and putting the HARQ-ACK feedback corresponding to the PDSCH with the low priority in the two arbitrary PDSCHs into the second sub-codebook.

In particular implementations, the first sub-codebook may precede the second sub-codebook; or, the first sub-codebook may be located after the second sub-codebook.

An embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium is a non-volatile storage medium or a non-transitory storage medium, and has computer instructions stored thereon, and when the computer instructions are executed, the steps of the HARQ-ACK codebook feedback method according to any of the above embodiments of the present invention are executed.

The embodiment of the present invention further provides another user terminal, which includes a memory and a processor, where the memory stores a computer instruction that can be executed on the processor, and the processor executes the steps of the HARQ-ACK codebook feedback method according to any of the above embodiments of the present invention when executing the computer instruction.

Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by instructing the relevant hardware through a program, which may be stored in a computer-readable storage medium, and the storage medium may include: ROM, RAM, magnetic or optical disks, and the like.

Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims

1. A HARQ-ACK codebook feedback method is characterized by comprising the following steps:

detecting whether an overlapped PDSCH exists in a time domain corresponding to a downlink time slot needing to feed back an HARQ-ACK codebook;

when overlapped PDSCHs are detected to exist, HARQ-ACK feedback corresponding to each PDSCH in the overlapped PDSCHs and HARQ-ACK feedback corresponding to other non-overlapped PDSCHs are respectively obtained, and HARQ-ACK codebooks are generated and sent;

the HARQ-ACK codebook comprises a first sub-codebook and a second sub-codebook, wherein:

the first sub-codebook comprises HARQ-ACK feedbacks corresponding to the other non-overlapping PDSCHs and HARQ-ACK feedbacks corresponding to one PDSCH in the overlapping PDSCHs; the number of PDSCHs corresponding to the first sub-codebook is KxM, wherein M is the number of PDSCHs which are not overlapped in each downlink time slot in the time domain;

the second sub-codebook comprises HARQ-ACK feedbacks corresponding to other PDSCHs in the overlapped PDSCHs; the number of PDSCHs corresponding to the second sub-codebook is K × N, N is the number of overlapped PDSCHs corresponding to each preconfigured downlink timeslot, N is a positive integer, K is the number of downlink timeslots corresponding to one uplink transmission time interval determined according to a preconfigured K1 set and uplink and downlink subcarrier intervals, and K1 is used for indicating the number of timeslots of downlink data and time intervals for HARQ-ACK feedback thereof.

2. The HARQ-ACK codebook feedback method of claim 1, wherein N-1 or 2.

3. The HARQ-ACK codebook feedback method of claim 1, wherein the overlapping PDSCH includes a high priority PDSCH and a low priority PDSCH.

4. The HARQ-ACK codebook feedback method of claim 3, wherein the PDSCH corresponding to HARQ-ACK feedback in the second sub-codebook is: a high priority PDSCH of the overlapping PDSCHs.

5. The HARQ-ACK codebook feedback method of claim 3, wherein the PDSCH corresponding to HARQ-ACK feedback in the second sub-codebook is: a low priority PDSCH of the overlapping PDSCHs.

6. The HARQ-ACK codebook feedback method of claim 3, wherein the generating a HARQ-ACK codebook comprises:

when the position of HARQ-ACK feedback corresponding to any two PDSCHs in the overlapped PDSCHs in the first sub-codebook is detected to be the same, the HARQ-ACK feedback corresponding to the PDSCH with low priority in any two PDSCHs is put into the first sub-codebook, and the HARQ-ACK feedback corresponding to the PDSCH with high priority in any two PDSCHs is put into the second sub-codebook; or, putting the HARQ-ACK feedback corresponding to the PDSCH with the high priority in the two arbitrary PDSCHs into the first sub-codebook, and putting the HARQ-ACK feedback corresponding to the PDSCH with the low priority in the two arbitrary PDSCHs into the second sub-codebook.

7. The HARQ-ACK codebook feedback method of claim 1, wherein the first sub-codebook is located before the second sub-codebook; or, the first sub-codebook is located after the second sub-codebook.

8. A user terminal, comprising:

the detection unit is used for detecting whether an overlapped PDSCH exists in a time domain corresponding to a downlink time slot needing to be fed back to the HARQ-ACK codebook;

a generating unit, configured to, when overlapping PDSCHs are detected to exist, respectively obtain HARQ-ACK feedback corresponding to each PDSCH in the overlapping PDSCHs and HARQ-ACK feedback corresponding to other non-overlapping PDSCHs, and generate a HARQ-ACK codebook;

a transmitting unit, configured to transmit the HARQ-ACK codebook;

the second sub-codebook comprises HARQ-ACK feedbacks corresponding to other PDSCHs in the overlapped PDSCHs; the number of PDSCHs corresponding to the second sub-codebook is K × N, N is the number of overlapped PDSCHs corresponding to each preconfigured downlink timeslot, and N is a positive integer, K is the number of downlink timeslots corresponding to one uplink transmission time interval determined according to a preconfigured K1 set and uplink and downlink subcarrier intervals, and K1 is used for indicating the number HARQ of timeslots of downlink data and time intervals for HARQ-ACK feedback thereof.

9. The user terminal of claim 8, wherein N-1 or 2.

10. The user terminal of claim 8, wherein the overlapping PDSCH comprises a high priority PDSCH and a low priority PDSCH.

11. The user terminal of claim 10, wherein the PDSCH corresponding to HARQ-ACK feedback in the second sub-codebook is: a high priority PDSCH of the overlapping PDSCHs.

12. The user terminal of claim 10, wherein the PDSCH corresponding to HARQ-ACK feedback in the second sub-codebook is: a low priority PDSCH of the overlapping PDSCHs.

13. The user terminal of claim 10, wherein the generating unit is configured to, when detecting that HARQ-ACK feedbacks corresponding to any two PDSCHs in the overlapped PDSCHs are identical in position in the first sub-codebook, put HARQ-ACK feedbacks corresponding to a low priority PDSCH in the any two PDSCHs into the first sub-codebook, and put HARQ-ACK feedbacks corresponding to a high priority PDSCH in the any two PDSCHs into the second sub-codebook; or, putting the HARQ-ACK feedback corresponding to the PDSCH with the high priority in the two arbitrary PDSCHs into the first sub-codebook, and putting the HARQ-ACK feedback corresponding to the PDSCH with the low priority in the two arbitrary PDSCHs into the second sub-codebook.

14. The user terminal of claim 8, wherein the first sub-codebook precedes the second sub-codebook; or, the first sub-codebook is located after the second sub-codebook.

15. A computer readable storage medium, being a non-volatile storage medium or a non-transitory storage medium, having stored thereon computer instructions, wherein the computer instructions, when executed, perform the steps of the HARQ-ACK codebook feedback method according to any of claims 1 to 7.

16. A user terminal comprising a memory and a processor, the memory having stored thereon computer instructions executable on the processor, wherein the processor executes the computer instructions to perform the steps of the HARQ-ACK codebook feedback method according to any of claims 1 to 7.