CN115836500A - HARQ feedback transmission method, base station and user equipment - Google Patents

Abstract

The base station transmits the preset configuration to user equipment (user equipment, UE). The preset configuration includes at least one of an active operation mode for HARQ feedback, a HARQ bundling configuration, and a pre-configuration of additional HARQ feedback bits. Indicating that the active operation mode representing HARQ feedback is one of an ACK-only mode and a NACK-only mode. The UE performs HARQ feedback according to preset configurations. The BS schedules sub-slot retransmission according to the HARQ feedback and the preset configuration.

Description

HARQ feedback transmission method, base station and user equipment

technical field

The present disclosure relates to the field of communication systems, and in particular to a hybrid automatic repeat request (Hybrid automatic repeat request, HARQ) feedback transmission method, base station and user equipment.

Background technique

Wireless communication systems and networks have evolved into a broadband and mobile system. In a cellular wireless communication system, a user equipment (user equipment, UE) is connected to a radio access network (radio access network, RAN) through a wireless link. The RAN includes a group of base stations (base stations, BSs) that provide radio links to the UEs located in the cells covered by the base stations, and an interface with the core network (CN), which provides the overall network control. It can be understood that the overall network-related functions. The 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP) developed the so-called Long Term Evolution (LTE) system, that is, the Evolved Universal Mobile Telecommunications System Territorial Radio Access Network (Evolved Universal Mobile Telecommunications System Territorial Radio Access Network, E-UTRAN), for mobile access networks, where one or more macro cells are supported by a base station called eNodeB or eNB (Evolved NodeB). More recently, LTE is being developed further towards the so-called 5G or new radio (NR) system, where one or more cells are supported by a base station called a gNB.

Ultra-reliable low-latency communication (URLLC) is one of several different types of use cases supported by the 5G NR standard specified by 3GPP Release 15. URLLC is a communication service for the successful delivery of packets with stringent requirements, especially in terms of availability, latency, and reliability. URLLC was developed to support the described emerging applications and services, such as wireless control and automation in industrial factory environments, vehicle-to-vehicle communication for improved safety and efficiency, and the described tactile Internet. Therefore, URLLC is very important to 5G, and supporting vertical orientation will bring new services to the entire telecom industry.

One of the key points of the described URLLC is low latency, enabling self-driving cars and remote surgery. Low latency allows the network to be optimized to handle incredibly large amounts of data with minimal latency or lag. The quality of service (QoS) required by URLLC is completely different from that of mobile broadband services.

URLLC guarantees a delay of 1 millisecond (ms) or less. Time-sensitive networking (TSN) is another component of the 5G URLLC. All devices connected along the URLLC must be synchronized on the same time base. For example, URLLC's enabling technologies include: integrated frame structure, incredibly fast turnaround, efficient control and data resource sharing, grant-based uplink transmission, and advanced channel coding schemes.

technical problem

UE feedback can enable better hybrid automatic repeat request (hybrid automatic repeat request, HARQ) operation and/or modulation and coding scheme (modulation and coding scheme, MCS) selection. One of UE feedback enhancements for HARQ-ACK in the 3GPP Release 17 standard is the HARQ feedback, which is used for a shorter semi-persistent scheduling (semi-persistent scheduling, SPS) period. Regarding the strict delay requirement of the URLLC traffic, in a separate physical uplink control channel (Physical uplink Control Channel, PUCCH) resource, each downlink (downlink, DL) SPS physical downlink shared channel (physical downlink shared channel, PDSCH) HARQ process can minimize the delay. However, this results in larger PUCCH overhead and complicated collision situations. In time division duplex (time division duplex, TDD) transmission mode, a large amount of PUCCH overhead also leads to frequent ACK/NACK discarding.

Contents of the invention

An object of the present disclosure is to propose a HARQ feedback transmission method, radio node and user equipment.

A first aspect of the present disclosure provides a method executable in a user equipment (UE), comprising: receiving an indication of an active mode of operation for hybrid automatic repeat request (HARQ) feedback, wherein the indication indicating that the active operation mode of HARQ feedback is one of an ACK-only mode and a NACK-only mode; and performing HARQ feedback according to the active operation mode of HARQ feedback.

A second aspect of the present disclosure provides a method executable in a base station, comprising: sending an indication of an active mode of operation for hybrid automatic repeat request (HARQ) feedback, wherein the indication indicates that the HARQ feedback is The active operation mode is one of ACK-only mode and NACK-only mode; sending SPSPDSCH; and scheduling retransmission of the SPS PDSC according to HARQ feedback and the active operation mode of HARQ feedback.

A third aspect of the present disclosure provides a method executable in a user equipment (UE), comprising: receiving a HARQ bundling configuration, wherein the HARQ bundling configuration indicates that a certain number of sub-slots in a slot are bundled in one group for HARQ feedback; and performing HARQ feedback according to the HARQ bundling configuration.

A fourth aspect of the present disclosure provides a method executable in a base station (BS), including: transmitting a HARQ bundling configuration, wherein the HARQ bundling configuration means that a certain number of sub-slots in a time slot are bundled in a used in the group for HARQ feedback; and scheduling SPS PDSCH retransmissions in response to bundled HARQ feedback and said HARQ bundle configuration.

A fifth aspect of the present disclosure provides a UE for performing the disclosed method.

A sixth aspect of the present disclosure provides a base station for performing the disclosed method.

The disclosed method can be implemented in a chip. The chip may include a processor configured to invoke and execute a computer program stored in a memory, so that a device installed with the chip executes the disclosed method.

The disclosed methods can be programmed as computer-executable instructions stored on a non-transitory computer-readable medium. The non-transitory computer readable medium, when loaded into a computer, instructs a processor of the computer to perform the disclosed method.

The non-transitory computer readable medium may include at least one of the group consisting of: a hard disk, a compact disc read only memory (CD-ROM), an optical storage device, a magnetic storage device, a read only memory, a Programming read-only memory, erasable programmable read-only memory (Erasable Programmable Read Only Memory, EPROM), electrically erasable programmable read-only memory (Electrically Erasable Programmable Read Only Memory, EEPROM) and flash memory.

The disclosed method can be programmed as a computer program product to cause a computer to execute the disclosed method.

The disclosed method can be programmed as a computer program to cause a computer to execute the disclosed method.

beneficial effect

The main content of the UE feedback enhancement work for HARQ-ACK is to improve the HARQ-ACK process of SPS PDSCH with a shorter period, such as HARQ feedback based on sub-slots, especially for the aforementioned Time Division Duplexing (Time Division Duplexing, TDD ) transfer mode.

The present disclosure provides alternative solutions including HARQ-ACK skipping mechanism and HARQ-ACK bundling to solve the problem of PUCCH overhead. The elastic mechanism described can reduce unnecessary resource overhead in different situations. Regarding the TDD transmission mode, in addition to the detailed operation of delaying the HARQ feedback on the UE side, this disclosure provides an embodiment in which the HARQ-ACK is delayed when the base station side has sufficient PUCCH resources.

Description of drawings

In order to more clearly illustrate the embodiments of the present disclosure or related technologies, the following figures will briefly introduce the embodiments. Obviously, as stated, one of ordinary skill in the art can obtain other diagrams from these diagrams without paying prerequisites.

Figure 1 shows a schematic diagram of a telecommunications system.

Figure 2 shows HARQ feedback transmission at the base station side according to one embodiment of the present disclosure.

FIG. 3 shows HARQ feedback transmission at the terminal side according to one embodiment of the present disclosure.

Fig. 4 shows HARQ feedback transmission at the base station side according to one embodiment of the present disclosure.

FIG. 5 shows HARQ feedback transmission at the terminal side according to one embodiment of the present disclosure.

FIG. 6 shows HARQ feedback transmission with respect to channel conditions according to one embodiment of the present disclosure.

FIG. 7 is a schematic diagram showing downlink sub-slots and uplink HARQ feedback according to an embodiment of the present disclosure.

Fig. 8 shows an example of HARQ feedback transmission at the base station side according to an embodiment of the present disclosure.

FIG. 9 shows HARQ feedback transmission at the terminal side according to one embodiment of the present disclosure.

Fig. 10 schematically shows bundled downlink sub-slots and uplink HARQ feedback according to one embodiment of the present disclosure.

Fig. 11 schematically shows bundled downlink sub-slots and HARQ feedback on uplink according to another embodiment of the present disclosure.

FIG. 12 schematically shows a schematic diagram of collision events during uplink HARQ feedback according to another embodiment of the present disclosure.

FIG. 13 shows a HARQ feedback transmission method using extra HARQ-ACK bits according to one embodiment of the present disclosure.

Figure 14 is a block diagram of a wireless communication system according to one embodiment of the present disclosure.

Detailed ways

The disclosed embodiments describe in detail the technical matters, structural features, objectives and effects achieved with reference to the accompanying drawings, specifically as follows. Specifically, terms in the embodiments of the present disclosure are only for the purpose of describing a certain embodiment, and are not intended to limit the present disclosure.

The invention provides a method for transmitting the hybrid automatic repeat request (HARQ) feedback on a semi-persistent scheduling (semi-persistent scheduling, SPS) physical downlink shared channel (Physical Downlink Shared Channel, PDSCH). In the description herein, HARQ-ACK means that HARQ feedback may include acknowledgment (acknowledgment, ACK) and negative acknowledgment (negative-acknowledgment, NACK). UE feedback enhancement for HARQ-ACK is one of the work items of 3GPP Release 17. The enhancement of the HARQ feedback of the shorter period SPS PDSCH can be evaluated from the aspects of HARQ feedback delay, PUCCH resource overhead, HARQ-ACK codebook structure and enhanced PUCCH resource allocation mechanism.

Said application discloses HARQ feedback corresponding to said SPS PDSCH with shorter period. The minimum SPS period mentioned above is 10ms in Release 15, and a shorter SPS PDSCH period may be supported in Release 16. To reduce said HARQ feedback delay, especially for URLLC traffic, support for sub-slot based HARQ feedback was approved in Release 16. However, frequent HARQ feedback for a shorter period of SPS PDSCH configuration may cause overhead and require more PUCCH resources. The present disclosure provides implementations of HARQ-ACK skipping and HARQ-ACK bundling to reduce the overhead of HARQ feedback.

In the time division duplex (Time Division Duplexing, TDD) transmission mode, the HARQ feedback responds to the SPSPDSCH, and due to the TDD configuration collides with the downlink (DL) time slot, according to Release 15, it should be discarded. The one-to-one HARQ feedback of SPS will lead to frequent downlink-uplink switching in the TDD mode, multiple time domain resource fragments, more PUCCH overhead, and more uplink (uplink, UL) channel collision. In order to achieve better performance, an alternative to improve the HARQ-ACK procedure is proposed in the disclosed information to solve the collision situation. The proposed method can reduce resource overhead and obtain low latency.

Referring to FIG. 1 , a UE 10a, a UE 10b, a base station 200a, and a network entity device 300 execute a disclosed method according to an embodiment of the present invention. Connections between devices and device components are shown in Figure 1 as lines and arrows. The UE 10a may include a processor 11a, a memory 12a, and a transceiver 13a. The UE 10b may include a processor 11b, a memory 12b, and a transceiver 13b. The base station 200a may include a processor 201a, a memory 202a and a transceiver 203a. The network entity device 300 may include a processor 301 , a memory 302 and a transceiver 303 . Each of the processors 11a, 11b, 201a and 301 may be configured to implement proposed functions, procedures and/or methods in the description. The various layers of the radio interface protocol can be implemented in the processors 11a, 11b, 201a and 301 as described. Each of the memories 12a, 12b, 202a and 302 is operable to store various programs and information to operate the connected processor. Each of the transceivers 13a, 13b, 203a and 303 is operatively coupled with an associated processor to transmit and/or receive radio signals. The UE 10a may communicate with the UE 10b through the side chain 110 . The base station 200a may be one of eNB, gNB or other radio nodes.

Each of the processors 11a, 11b, 201a and 301 may include application-specific integrated circuits (ASICs), other chipsets, logic circuits and/or data processing devices. Each of the memories 12a, 12b, 202a and 302 may include a read-only memory (read-only memory, ROM), a random access memory (random access memory, RAM), a flash memory, a memory card, a storage medium and /or other storage devices. Each of the transceivers 13a, 13b, 203a and 303 may include a baseband circuit and a radio frequency (radio frequency, RF) circuit to process radio frequency signals. When the embodiments are implemented in software, the techniques can be implemented as modules, procedures, functions, entities, etc., that perform the described functions. The modules may be stored in memory and executed by the processor. The memory can be implemented within a processor or external to the processor, where those can be communicatively coupled to the processor by various means, as is known in the art.

The network entity device 300 may be a node in the CN. CN may include LTE CN or 5GC, which includes user plane function (user plane function, UPF), session management function (session management function, SMF), mobility management function (mobility management function, AMF), unified data management (unified data management , UDM), policy control function (policy control function, PCF), control plane/user plane separation (control plane/user plane separation, CUPS), authentication server (authentication server, AUSF), network slice selection function (network slice selection function, NSSF) and the network exposure function (network exposure function, NEF).

According to the 3GPP standard Release 15, the UE determines the HARQ feedback PUCCH resource of each SPS PDSCH and the HARQ feedback PUCCH resource of one SPS PDSCH of a serving cell according to the slot-level HARQ-ACK timing. According to the 3GPP Release 16 standard, the UE can perform HARQ feedback on the DL SPS with a shorter period, thus causing a trade-off between delay and PUCCH overhead. When the HARQ feedback of each SPS PDSCH is transmitted in each PUCCH, the time delay may be kept relatively low, resulting in relatively large PUCCH overhead. Therefore, a feasible solution is needed to balance the delay and PUCCH overhead. In the following, several solutions to the problem from different angles are revealed.

The implementation of HARQ-ACK skipping is detailed below.

The present disclosure provides an implementation of skipping the specified HARQ feedback, so as to meet the URLLC delay requirement and reduce the overhead of PUCCH.

Examples of NACK feedback skipping are detailed below.

In NR Release 15, only one PUCCH for HARQ-ACK transmission is supported in one slot. Enabling more than one PUCCH occasion for HARQ-ACK transmission in one slot is beneficial to provide fast HARQ feedback and reduce delay. The conclusion is that more than one PUCCH transmission occasions in which HARQ feedback is transmitted in one time slot should be supported in NR Rel-16. Since the URLLC data flow has stricter requirements on delay and reliability, the sub-slot-based HARQ feedback can improve the delay performance. However, frequent HARQ feedback may cause huge signaling overhead.

Referring to Figures 2 and 3, one embodiment supports ACK-only HARQ feedback. The mode of operation for ACK-only HARQ feedback between the BS and UE is activated (blocks 210 and 222). Activating the ACK-only HARQ feedback mode of operation may be triggered by the UE or the BS.

The BS sends an SPS PDSCH to the UE (block 212). The UE determines whether the SPSPDSCH is received by the UE (block 224). When the UE does not receive the SPS PDSCH, the UE skips NACK feedback to the BS associated with the PDSCH (block 228). When the UE receives the SPS PDSCH, the UE determines whether the UE successfully decoded the SPS PDSCH (block 226). When the UE does not successfully decode the SPS PDSCH, the UE skips NACK feedback to the BS associated with the PDSCH (block 228). In the described ACK-only HARQ feedback mode of operation. When the UE detects the SPS PDSCH release specified in the downlink control information (downlink control information, DCI) format of the BS, or when the UE correctly decodes the PDSCH transmitted from the BS, the The UE generates and reports a positive acknowledgment (ACK) (block 227). The ACK is a response to the PDSCH. When the UE does not decode correctly, the UE does not feed back a NACK related to the PDSCH to the BS. Examples of the UE may include UE 10a and UE 10b in FIG. 1 . Examples of the BS may include BS 200a in FIG. 1 .

The BS schedules retransmission of the SPSPDSCH according to the HARQ feedback of the UE and the active operation mode of the HARQ feedback. In the ACK-only HARQ feedback working mode, the base station does not retransmit the PDSCH when receiving the HARQ feedback from the UE as ACK. If no HARQ feedback from the UE is received within a specified time, the base station retransmits the PDSCH (block 214).

For example, the specified times are specified in TS 38.213 Sections 9.2.3 and 9.1.2. For the reception of the SPS PDSCH that ends in time slot n, the above-mentioned UE sends the above-mentioned HARQ feedback PUCCH for the above-mentioned SPS PDSCH in time slot n+k, where k is provided by the above-mentioned PDSCH-to-HARQ_feedback timing index field in the DCI format, and the The DCI format activates reception of the above-mentioned SPSPDSCH. If the above-mentioned UE detects a DCI format that does not include the PDSCH-to-HARQ_feedback timing indicator field, and the DCI format arranges for the PDSCH reception that ends in time slot n or activates the SPS PDSCH reception that ends in time slot n, then the above-mentioned UE Corresponding HARQ-ACK information is provided in PUCCH transmission in time slot n+k, k is provided by dl-DataToUL-ACK, or provided by dl-DataToUL-ACKForDCIFormat1_2 of DCI format 1_2.

Since URLLC traffic provides high reliability to meet block error rate (BLER) targets and facilitates successful decoding of PDSCH, NACK feedback is less likely, and ACK feedback alone is sufficient for said base station to make decision making. When the PDSCH is lost, or when the UE fails to decode data in the PDSCH, the BS schedules retransmission of the PDSCH. The aforementioned NACK skip operation can save UE power and eliminate interference between HARQ feedback and UL transmission.

In the operation mode of ACK-only HARQ feedback, the communication between the UE and the base station may be as follows.

- When failing to decode the PDSCH of the base station, the UE does not send any information to the base station. The base station retransmits the PDSCH to the UE.

- when successfully decoding the PDSCH of the base station, the UE sends an ACK to the base station.

- said UE sends an ACK to said base station when receiving PDSCH transmissions are disabled. The base station completes SPSPDSCH transmission.

- When the base station does not send any information to the UE on the SPS resource, the UE does not send any information to the base station. Since the base station can identify which SPS resource does not carry anything to the UE in the DL, the base station takes no further action in this case.

From the perspective of the UE, the operation mode of the ACK-only HARQ feedback also brings obvious advantages to the discontinuous transmission (discontinuous transmission, DTX) of the UE. Specifically, when the PDCCH cannot be decoded, the UE will skip sending a NACK to the base station. In the ACK-only HARQ feedback working mode, when no acknowledgment from the UE is received, the BS executes the retransmission procedure and ensures the reliability of the retransmission.

The implementation manner of ACK feedback skipping is detailed below.

Different from the above embodiment, the embodiment of skipping ACK and only NACK operation is detailed below. For example, when failing to decode the PDSCH, the UE sends a NACK to the BS. When the PDSCH is successfully decoded, the UE does not send any information, but this disclosure should also pay attention to the following cases.

- When detecting SPS deactivation called SPS release, the UE sends an ACK to the base station, which completes the SPSPDSCH transmission. Although this is a NACK-only mechanism, this disclosure is still subject to the ACK feedback for SPS PDSCH release.

- When the base station does not send any information to the UE on the SPS resource, the UE does not send any information to the base station. From the perspective of the base station, the BS can identify which SPS resource does not carry PDSCH to the UE in DL, so the base station has no further action in this case.

- The base station may send an SPS PDSCH to the UE, and the UE may send a NACK after failing to decode the SPS PDSCH. The base station may not be able to successfully decode the NACK due to noise or interference. When the base station cannot successfully decode the NACK due to noise or interference. If the UE does not receive the retransmission of the SPS PDSCH from the base station within the time window, the UE may retransmit the NACK to the base station. The time window can be defined otherwise.

Referring to Figures 4 and 5, one embodiment of the present disclosure supports NACK-only HARQ feedback. The mode of operation for NACK-only HARQ feedback between the BS and UE is activated (blocks 210a and 222a). Activation of the NACK HARQ feedback only mode of operation may be triggered by the UE or the BS.

The BS sends an SPS PDSCH to the UE (block 212a). The UE determines whether the SPSPDSCH is received by the UE (block 224a). When the UE does not receive the SPS PDSCH, the UE sends NACK feedback related to the PDSCH to the BS. (block 228a). When the UE receives the SPS PDSCH, the UE determines whether the UE successfully decoded the SPS PDSCH (block 226a). When the UE fails to successfully decode the SPS PDSCH, the UE sends NACK feedback related to the PDSCH to the base station. (block 228a). In the described NACK-only HARQ feedback mode of operation. When the UE correctly decodes the PDSCH from the BS, the UE skips sending an ACK to the BS (block 227a). The ACK is a response to the PDSCH. When the UE does not correctly decode the PDSCH, the UE sends a NACK related to the PDSCH to the BS.

The BS schedules retransmission of the SPSPDSCH according to the HARQ feedback of the UE and the active operation mode of the HARQ feedback. In the NACK-only HARQ feedback mode of operation, the base station retransmits the PDSCH when the received HARQ feedback from the UE is NACK (block 214a).

The activated operation mode of the HARQ feedback may be carried in downlink control information (DCI) or higher layer signaling, such as radio resource control (radio resource control, RRC) signaling.

Embodiments of skipping HARQ feedback under certain conditions are further detailed below.

The NACK or ACK skip procedure can reduce some PUCCH overhead. Since less NACK feedback is expected to be obtained under good channel conditions, the NACK skipping operation may not save much resources. A similar situation can be observed for the ACK skipping operation under the described poor channel conditions. In order to deal with the problem described, the HARQ feedback skip procedure can be initiated according to the channel condition. The channel condition between the UE and the BS is good. The decoding process has a high probability of success and a large number of ACKs from the UE to the BS can be expected. On the contrary, when the channel condition is bad, the decoding process is more likely to fail, and a large number of NACKs can be expected. In order to adapt to this situation, the HARQ feedback may execute the skip procedure according to the channel condition. Referring to FIG. 6, channel conditions between the UE and the BS are detected (block 600) and determined (block 602). When said channel condition is good, activate ACK-skip operation, ie only NACK, (block 604). When said channel condition is bad, activate NACK-skip operation, ie ACK-only operation (block 606). From the perspective of the base station, the base station may make a decision in block 602 according to the channel state information (channel state information, CSI) feedback, such as channel quality indicator (channel quality indicator, CQI) feedback, and report to the The UE indicates the HARQSkipIndicator which HARQ feedback mode of operation is activated (block 608). The indicator may be explicitly or implicitly communicated to the UE. A 1-bit parameter HARQSkipIndicator may be transmitted by DCI or higher layers. For example, HARQSkipIndicator=0 means to execute the ACK-skip procedure, and HARQSkipIndicator=1 means to execute the NACK-skip procedure. When receiving the HARQSkipIndicator, it means that the HARQ feedback operation mode is activated in the BS. The UE may activate the same HARQ feedback operation mode on the UE side.

The HARQ-ACK skipping mechanism can also be used in combination with a new data indication (NDI). The active mode of operation for HARQ feedback may remain between the UE and the BS until the NDI is switched. If the HARQSkipIndicator does not exist in the initial transmission, and/or the NDI in the received HARQ information is 0 or the NDI is not switched. The HARQ feedback operation mode can be preset as a traditional HARQ feedback operation mode, the ACK-only, or the NACK-only mode. When the NDI is switched and/or the HARQSkipIndicator is obtained, the HARQ-ACK skip mechanism may be activated, and the UE may activate the HARQ feedback operation mode according to the indication of the HARQSkipIndicator.

Embodiments of HARQ-ACK bundling are detailed below.

The base station (base station, BS) may allow the UE to select two sub-slot configurations for the PUCCH: "2-symbol*7" and "7-symbol*2". The "2-symbol*7" indicates a time slot consisting of seven sub-slots, and each sub-slot has two symbols. The aforementioned "7-symbol*2" means a slot consisting of two sub-slots, each sub-slot has seven symbols. The UE reports the HARQ feedback of the SPS PDSCH to the BS, and there is no dynamic PDSCH HARQ-ACK.

Referring to Figure 7, in the example of "2-symbol*7" sub-slot configuration, if the separate HARQ feedback of SPS PDSCH is supported, 7 sub-slots in one slot need 7 PUCCHs, that is, PUCCH1-PUCCH7, carrying HARQ is fed back to the base station. A time slot 700 for the BS to transmit in the downlink includes seven sub-slots, and each sub-slot is allocated to one SPS PDSCH transmission. Sub-slot based PUCCH1-PUCCH7 carry HARQ feedback related to each respective SPS PDSCH. The association between the SPS PDSCH in a sub-slot and a PUCCH carrying the HARQ feedback of the SPS PDSCH is shown by the arrow connecting the SPS PDSCH and the PUCCH.

变量SubslotNumperSlot表示每个时隙的子时隙数。可以由下行链路控制信息(DCI)或更高层次的信息，如无线资源控制(RRC)信令，确定HARQGroupIndex。特别是，(HARQGroupIndex+1)代表要捆绑于每组中的HARQ反馈的数量。时隙的组数可以用下面的公式得到。Frequent and excessive HARQ feedback may result in a large amount of PUCCH resource overhead, as well as potential ACK/NACK discards in the TDD transmission mode. The HARQ-ACK information bits can be bundled in some specific cases to reduce PUCCH overhead. Embodiments of the present invention provide a HARQ bundling configuration, which means that a certain number of sub-slots in a time slot are bundled into a group for HARQ feedback. In some embodiments of the present disclosure, the SPS PDSCH in one slot may be divided into different groups, each group generating one HARQ-ACK information bit. In each group, the UE may perform a binary AND operation on the HARQ-ACK information bits corresponding to the SPS PDSCH in the group. For example, a HARQ-ACK information bit value of 0 represents NACK, and a HARQ-ACK information bit value of 1 represents ACK. In an embodiment, the HARQ bundling configuration includes the n-bit parameter HARQGroupIndex. The constant n is related to the total number of sub-slots in a time slot, wherein

The variable SubslotNumperSlot represents the number of subslots per slot. HARQGroupIndex can be determined by downlink control information (DCI) or higher level information, such as radio resource control (RRC) signaling. In particular, (HARQGroupIndex+1) represents the number of HARQ feedbacks to be bundled in each group. The number of groups of time slots can be obtained by the following formula.

8 and 9, the BS may determine a HARQ bundling configuration (block 341) and transmit the HARQ bundling configuration to the UE (block 342). The HARQ bundling configuration including HARQGroupIndex may be carried in downlink control information (DCI) or high layer signaling, such as radio resource control (RRC) signaling. The UE receives a HARQ bundling configuration from the BS (block 352), and transmits bundled HARQ feedback according to the HARQ bundling configuration (block S354). The BS receives the bundled HARQ feedback from the UE, schedules and performs PDSCH retransmissions according to the bundled HARQ feedback and the HARQ bundle configuration (block 344).

In the aforementioned "2-symbol*7" sub-slot configuration example, SubslotNumperSlot=7, HARQGroupIndex=1 means that every two HARQ-ACK bits are bundled, groupNum=4 means that each time slot has 4 groups of subslots time slot. Each of the first three groups of time slots includes 2 SPS PDSCHs allocated in 2 sub-slots, and the fourth group includes 1 SPS PDSCH allocated in 1 sub-slot. As shown in FIG. 10, the UE performs a binary AND "AND" operation on each group of HARQ-ACK information bits of each SPS PDSCH in the group. For example, PUCCH1 in FIG. 10 is the result of performing a binary AND operation on the HARQ-ACK information bits of the first SPS PDSCH and the second SPS PDSCH in the first group of sub-slots. In the described embodiment, the number of PUCCHs can be reduced to four. The timing of the HARQ feedback of each group follows the timing index of the last SPS PDSCH in the group. In other words, the time schedule for sending the HARQ-ACK bits for the group is specified by the timing index of the last SPS PDSCH in the group.

Referring to FIG. 11 , in another example, HARQGroupIndex=3 indicates that every 4 HARQ-ACK bits are bundled into a group, and groupNum=2 indicates that each slot has 2 groups of sub-slots. Group 1 includes 4 SPSPDSCHs in 4 sub-slots respectively, and Group 2 includes 3 SPS PDSCHs in 3 sub-slots respectively. As shown in FIG. 11 , the UE performs a binary AND operation on the HARQ-ACK information bits of the SPS PDSCH in each group. In one example, the number of PUCCHs can be reduced to two. The HARQ feedback timing of each group follows the timing index of the last SPS PDSCH in the group. For example, the timing index may include a PDSCH-to-HARQ timing index.

From the perspective of the base station, if the HARQ-ACK information bit of the one bundling group is 0 (ACK). That is, if the HARQ feedback of all members of the bundling group is ACK, the base station does not schedule retransmission. If the HARQ-ACK information bit of the bundling group is 1 (NACK), it means that there is at least one NACK feedback in the group. The BS retransmits all SPS PDSCHs corresponding to the HARQ feedback in the bundled group.

The implementation of the enhanced HARQ feedback in the TDD transmission mode is detailed below.

In Release 15, if the UE is configured with SPS PDSCH, and the SPS PDSCH is received in time slot n, then the UE sends a HARQ-ACK for the SPS PDSCH in time slot n+K1 PUCCH. Wherein, K1 is the number of time slots indicated by the PDSCH-to-HARQ_feedback timing indicator field in the corresponding DCI format, if the PDSCH-to-HARQ_feedback timing indicator field does not exist in the DCI format, then by dl- DataToUL-ACK provided. If there is no uplink (uplink, UL) resource available in time slot n+K1 due to collision with TDD configuration, the UE cancels the PUCCH transmission, and the HARQ-ACK carried by the PUCCH transmission is used for SPS PDSCH received in the slot. However, shorter SPS periods are supported in Release 16 to reduce latency. The timing indicator value indicated by the activated DCI or higher layers is the same for each SPSPDSCH within the time resource range. The period of SPS PDSCH is short, which may cause frequent collisions. One type of collision known as TDD-related collision is a collision between a HARQ-ACK transmission and a slot format dictated by a semi-static or dynamic TDD configuration, especially for heavy downlink traffic situations. One type of collision called ACKs/NACKs collision is a collision between HARQ ACKs/NACKs of multiple SPS PDSCHs in the same PUCCH resource. If the mechanism in Release 15 is re-used, dropping HARQ feedback is to be expected as collision events occur frequently.

As shown in Figure 12, in the example where each time slot has 2 sub-slots, and in the sub-slot unit of the HARQ feedback timing index K1=3, part of the TDD time slot configuration includes the first three The time slots are downlink time slots DL#1-DL#3, a flexible time slot F#1 of a flexible symbol, and an uplink time slot UL#1. According to the configured HARQ feedback timing index K1=3. The HARQ-ACK for transmitting the SPS PDSCH in the second sub-slot of DL #1 is transmitted in the first sub-slot of DL #3. Likewise, the HARQ-ACK feedback of the SPS PDSCH transmitted in the second sub-slot of DL#2 is transmitted in the first sub-slot of F#1. The HARQ-ACK feedback of the SPS PDSCH transmitted in the second sub-slot of the DL#3 is transmitted in the first sub-slot of the UL#1. In the example described, only the SPS PDSCH transmitted in DL#3 can successfully transmit HARQ feedback in UL#1. To comply with the regulations in Release 15, especially for the SPS PDSCH transmitted in DL#1, the HARQ feedback in DL#3 should be discarded.

If the SPS PDSCH cycle is shortened, the HARQ feedback discarding may often occur. In order to solve the problem, the present invention proposes flexible symbols on the HARQ feedback timing of the SPS PDSCH, and the flexible symbols, such as F#1, can be used instead for HARQ feedback related to the SPS PDSCH the UL symbol. That is, the UE determines a flexible symbol as an uplink symbol at the HARQ feedback time of the SPS PDSCH. If the symbol on the HARQ feedback time of the SPS PDSCH is an elastic symbol, the UE is configured to send the PUCCH with HARQ feedback for the SPS PDSCH on the symbol. According to TS 38.213 Section 11.1, if tdd-UL-DLConfigurationCommon is not provided, the UE can determine that a symbol is elastic and if the UE is configured to transmit a Sounding Reference Signal (SRS) on the symbol ), PUCCH, physical uplink shared channel (physical uplink shared channel, PUSCH) or physical random access channel (Physical Random Access Channel, PRACH), then determine that the elastic symbol is an uplink symbol. Therefore, at the UE side, the flexible symbols may be regarded as uplink symbols. In this embodiment, in the determination related to the elastic symbol, the HARQ-ACK feedback of the SPS PDSCH can be regarded as a trigger for the UE. That is, if the UE is configured to send the HARQ feedback for the SPS PDSCH on the symbol, the UE may determine that the flexible symbol is an uplink symbol. When the HARQ-ACK feedback of the SPS PDSCH collides on the elastic symbol, it may have a higher priority than other uplink traffic.

For collisions between HARQ-ACK of SPS PDSCH and non-uplink symbols, since SPS PDSCH may carry URLLC traffic, it is better not to drop HARQ feedback. Another solution is to defer the HARQ feedback to the available slot or sub-slot. However, this raises another question: whether the available slots or sub-slots have enough resources for the additional HARQ feedback. With regard to the stated problems, the present disclosure proposes the following embodiments.

An embodiment of PUCCH resource determination based on the number of downlink slots is detailed below.

Postponing said HARQ feedback when a collision occurs may lead to another problem: how to determine that resources in available slots or sub-slots are sufficient for UL transmission. In an embodiment, the base station, such as gNB, can pre-configure the above situations. The pre-configuration may be performed on the basis of the number of downlink time slots preceding the uplink time slot. For example, the base station may perform the pre-configuration in the unit of one radio frame. That is, the pre-configuration is valid for multiple sub-slots in the radio frame. The base station may determine additional bits for the PUCCH in the TDD transmission mode according to the downlink slot number in a frame. In the example where 6 downlink slots are included in a radio frame, the base station can generate an additional 6 bits for HARQ feedback. Since only the HARQ feedback of the SPS PDSCH should be reported according to the 3GPP protocol, in this case more than one HARQ-ACK bit can be used for the SPS PDSCH for which there is no associated grant in the PUCCH resource. When the extra bits in the PUCCH are still insufficient to satisfy all the collided HARQ feedbacks, the UE processes the HARQ feedbacks differently by prioritizing the HARQ feedbacks corresponding to the higher priority SPS PDSCHs. When the colliding HARQ feedbacks have the same priority, the UE processes the HARQ feedbacks differently by prioritizing the earlier HARQ feedbacks and discarding the remaining HARQ feedbacks.

An embodiment of PUCCH resource determination based on SPS PDSCH configuration is detailed below.

The extra bits in each DL slot may cause unnecessary resource overhead, and the pre-configuration may also be based on the number of SPS PDSCHs. Regarding the rules in Rel-15, the period of SPS PDSCH configuration should not be less than 10 ms, even if the period can be shorter, the processing can be performed in units of one radio frame. The number of SPS PDSCHs calculated by the base station before DCI scheduling PUCCH or PUSCH for HARQ-ACK and giving extra bits to the extra HARQ feedback bits.

Referring to FIG. 13, the BS may preconfigure additional PUCCH bits as HARQ-ACK bits for SPS PDSCH subslots (block 620), and transmit the preconfiguration to the UE. The preconfigured additional PUCCH bits may be determined according to the number of downlink time slots or the number of downlink SPS PDSCH sub-slots.

At the HARQ feedback timing of the SPS PDSCH, the UE determines whether a collision occurs during the HARQ feedback operation of the SPS PDSCH (block 622). If no collision occurs during the HARQ feedback operation, the UE sends the HARQ feedback of the SPS PDSCH to the BS (block 624).

If a collision occurs during the HARQ feedback operation, the UE determines the type of the collision (block 623). When the collision is a TDD-related collision, the UE defers the HARQ feedback (block 626). When the collision is an ACKs/NACKs related collision, the UE differentiates HARQ feedback for different SPS PDSCHs (block 628). When the extra bits of the PUCCH are still insufficient to satisfy all the collided HARQ feedbacks, the UE processes the HARQ feedbacks differently by prioritizing the HARQ feedbacks corresponding to the higher priority SPSPDSCHs. When the colliding HARQ feedbacks have the same priority, the UE processes the earlier HARQ feedbacks preferentially to process the HARQ feedbacks differently, and discards the rest of the HARQ feedbacks. The earlier HARQ feedback may be the earlier received HARQ-ACK bit of the SPS PDSCH. When a PUCCH resource collision occurs during the HARQ feedback period, HARQ feedback bits related to different SPS PDSCHs are distinguished.

Any combination of the described embodiments is possible.

FIG. 14 is a block diagram of an example system 700 for wireless communication, according to one embodiment of the present invention. The implementations described herein may be implemented into a system using any suitably configured hardware and/or software. 14 shows a system 700 comprising a radio frequency (RF) circuit 710, a base frequency circuit 720, a processing unit 730, a memory/storage 740, a display 750, a camera 760, a sensor 770 and an input/output (I/O) interface 780 , connected to each other as shown in the figure.

The aforementioned processing unit 730 may include circuits such as, but not limited to, one or more single-core or multi-core processors. The processor may include any combination of general purpose and special purpose processors, such as graphics processors and application processors. The aforementioned processor may be coupled with memory/storage and configured to execute instructions stored in the memory/storage, so as to cause various applications and/or operating systems to execute on the system.

The above-mentioned baseband circuit 720 may include circuits such as, but not limited to, one or more single-core or multi-core processors. The processor may include a baseband processor. The baseband circuitry described above handles various radio control functions, enabling it to communicate with one or more radio networks via radio frequency circuitry. The above-mentioned radio control functions may include but not limited to signal modulation, encoding, decoding, frequency modulation transfer and so on. In some embodiments, the baseband circuitry described above may provide communications compatible with one or more radio technologies. For example, in some embodiments, the baseband circuit can support communication with 5G NR, LTE, Evolved Universal Terrestrial Radio Access Network (Evolved Universal Terrestrial Radio Access Network, EUTRAN) and/or other Wireless Metropolitan Area Network (Wireless Metropolitan Area Network) , WMAN), wireless local area network (Wireless Local Area Network, WLAN), wireless personal area network (Wireless Personal Area Network, WPAN) communication. Embodiments in which the baseband circuit described above is configured to support radio communications of more than one wireless protocol may be referred to as a multi-mode baseband circuit. In various implementations, the above-described fundamental frequency circuit 720 may include circuitry to operate on signals at frequencies that are not strictly considered fundamental frequencies. For example, in some implementations, the baseband circuit may include circuitry that operates on a signal having an intermediate frequency that is between the baseband frequency and the frequency modulation.

The radio frequency circuit 710 described above may enable communication with a wireless network using modulated electromagnetic radiation through a non-solid medium. In various implementations, the aforementioned RF circuitry may include switches, filters, amplifiers, etc. to facilitate communication with wireless networks. In various embodiments, the RF circuitry 710 described above may include circuitry to operate on signals that are not strictly considered to be frequency modulated. For example, in some implementations, radio frequency circuitry may include circuitry that operates on signals having an intermediate frequency between the fundamental frequency and the frequency modulation.

In various embodiments, the transmitter circuit, control circuit or receiver circuit of the UE, eNB or gNB discussed above may be fully or partially embodied in one or more of the radio frequency circuit, baseband circuit and/or processing unit multiple. As used herein, "circuitry" may refer to, be part of, or include an Application Specific Integrated Circuit (ASIC), electronic circuit, processor (shared, dedicated, or combined) and/or execute one or more memory (shared, dedicated, or combined), combinational logic circuits, and/or other suitable hardware components that provide the described functionality for a software or firmware program. In some embodiments, the circuitry of the electronic device may be implemented in one or more software or firmware modules, or functions related to the circuitry may be implemented by one or more software or firmware modules. In some implementations, some or all components of the baseband circuit, the processing unit and/or the memory/storage may be implemented together on a system on a chip (System On A Chip, SOC).

The memory/storage 740 described above may be used to load and store data and/or instructions, eg, for the systems described above. The aforementioned memory/storage for one embodiment may include any combination of suitable volatile memory, such as Dynamic Random Access Memory (DRAM), and/or non-volatile memory, such as flash memory. In various implementations, the I/O interface 780 may include one or more user interfaces intended for a user to interact with the system described above and/or peripheral component interfaces intended for peripheral components to interact with the system described above. A user interface may include, but is not limited to, a physical keyboard or keypad, touch pad, speaker, microphone, and the like. Peripheral component interfaces may include, but are not limited to, non-volatile memory ports, Universal Serial Bus (USB) ports, audio jacks, and power interfaces.

In various implementations, the aforementioned sensors 770 may include one or more sensing devices to determine environmental conditions and/or location information associated with the aforementioned systems. In some embodiments, the aforementioned sensors may include, but are not limited to, gyroscope sensors, accelerometers, proximity sensors, ambient light sensors, and positioning units. The positioning unit described above may also be part of, or interact with, baseband circuitry and/or radiofrequency circuitry in order to communicate with components of a positioning network, such as Global Positioning System (GPS) satellites. In various embodiments, the display 750 described above may include a display, such as a liquid crystal display and a touch screen display. In various implementations, the above-mentioned system 700 may be a mobile computing device, such as, but not limited to, a notebook computing device, a tablet computing device, a Netbook, an Ultrabook, a smart phone, etc. . In various implementations, the system may have more or fewer components, and/or a different architecture. Where appropriate, the methods described herein can be implemented as computer programs. The computer program may be stored on a storage medium, such as a non-transitory storage medium.

Embodiments of the present invention are combinations of techniques/processes that may be employed in 3GPP specifications to create the final product.

Those of ordinary skill in the art understand that each unit, algorithm, and step described and disclosed in the embodiments of the present invention are implemented using electronic hardware or a software combination of computer and electronic hardware. Whether these functions are implemented in hardware or in software depends on the conditions of the application and the design requirements of the technical solution. Those skilled in the art may use different ways to implement the functions of each specific application, and such implementation ways should not exceed the scope of the present invention. Those skilled in the art can understand that since the working processes of the above systems, devices and units are basically the same, they can refer to the working processes of the systems, devices and units in the above embodiments. For ease of description and simplification, these working processes will not be described in detail.

It can be understood that the systems, devices and methods disclosed in the embodiments of the present invention can be implemented in other ways. The above-mentioned embodiments are only illustrative examples. The division of the units mentioned above is only based on the division of logical functions, and there may be other division methods during implementation. It is possible for multiple units or components to be combined or integrated into another system. It is also possible that some features were omitted or skipped. On the other hand, the mutual coupling, direct coupling or communicative coupling described or discussed above refers to the coupling through some ports, devices or units, whether indirectly or through electronic, mechanical or other forms of communication.

The units mentioned above as separate components for explanation may be physically separate components or not. The units mentioned above may be physical units or not, that is to say, they may be set in one place or distributed on multiple network units. Some or all of the above-mentioned units may be used depending on the purpose of the embodiment. In addition, each functional unit in each embodiment may be integrated into a processing unit, or be physically independent, or be integrated into a processing unit having two or more units.

If the software functional unit is implemented as a product to be used and sold, it may be stored in a computer-readable storage medium. Based on this understanding, the technical solutions proposed by the present invention can be implemented in the form of software products in part or in part. Alternatively, a portion of a technology program that benefits legacy technology can be implemented as a software product. The software product in the computer is stored in the storage medium, and includes multiple commands for the computing device (such as a personal computer, server or network device) to execute all or part of the steps disclosed in the embodiments of the present invention. The storage medium includes a USB disk, a removable hard disk, a read only memory (ROM), a random access memory (RAM), a floppy disk or other types of media capable of storing program codes.

In the present disclosure, a base station transmits a preset configuration to a user equipment (UE). The preset configuration includes at least one of an active operation mode for HARQ feedback, a HARQ bundling configuration, and a pre-configuration of additional HARQ feedback bits. The indication indicates that the active operation mode for HARQ feedback is one of an ACK-only mode and a NACK-only mode. The UE performs HARQ feedback according to preset configurations. The BS schedules sub-slot retransmission according to the HARQ feedback and the preset configuration.

While this summary has been described in connection with what is considered to be the most practical and preferred embodiment, it is to be understood that this summary is not limited to the disclosed embodiment, but is intended to cover the broadest possible scope without departing from the appended claims. Explain the range of circumstances in which various arrangements are made.

Claims (84)

1. A method, executed on user equipment (user equipment, UE), comprising: receiving an indication of an active mode of operation for hybrid automatic repeat request (hybrid automatic repeat request, HARQ) feedback, wherein the indication indicates that the active mode of operation for HARQ feedback is one of an ACK-only mode and a NACK-only mode; and HARQ feedback is performed according to said active mode of operation for HARQ feedback. 2. The method according to claim 1, wherein when the indication indicates that the active mode of operation for HARQ feedback is the ACK-only mode, the method further comprises: In the case of successful decoding of the semi-persistent scheduling (semi-persistent scheduling, SPS) physical downlink shared channel (PhysicalDownlink Shared Channel, PDSCH), send ACK; In the case of unsuccessful decoding of the SPS PDSCH, the sending of NACK is skipped. 3. The method of claim 2, further comprising: An ACK is sent in response to the release of the SPS PDSCH. 4. The method according to claim 1, wherein when the indication indicates that the active mode of operation for HARQ feedback is the NACK-only mode, the method further comprises: In response to successful decoding of SPS PDSCH, skip sending ACK; and A NACK is sent in response to the unsuccessful decoding of the SPS PDSCH. 5. The method of claim 4, further comprising: In response to the release of the SPS PDSCH, an ACK is sent. 6. The method of claim 1, wherein the indication of the active mode of operation of the HARQ feedback is determined based on radio channel conditions associated with the UE. 7. The method according to claim 6, wherein the wireless channel condition is represented by channel state information (CSI). 8. The method according to claim 1, wherein the active operation mode of HARQ feedback may remain unchanged until a New Data Indicator (NDI) is switched. 9. A method, performed at a base station, comprising: Sending an indication of an active operation mode of hybrid automatic repeat request (hybrid automatic repeat request, HARQ) feedback, wherein the indication indicates that the active operation mode of HARQ feedback is one of ACK-only mode and NACK-only mode; Send SPS PDSCH; and Retransmissions to said SPS PDSC are scheduled according to HARQ feedback and said active mode of operation for HARQ feedback. 10. The method of claim 9, wherein when the indication indicates that the active mode of operation for HARQ feedback is the ACK-only mode, the method further comprises: When no ACK related to the SPS PDSCH is received within the scheduled time, the SPS PDSCH is resent. 11. The method according to claim 10, wherein when the SPS PDSCH is transmitted in n sub-slots, the scheduled time sequence is the n+k1th sub-slot. 12. The method according to claim 9, wherein when the indication indicates that the active operation mode of HARQ feedback is the NACK-only mode, the method further comprises: retransmitting the SPS PDSCH in response to a NACK associated with the SPS PDSCH. 13. The method of claim 9, wherein the HARQ feedback indication of the active mode of operation is determined based on radio channel conditions associated with the UE. 14. The method according to claim 13, wherein the wireless channel condition is represented by channel state information (CSI). 15. The method according to claim 9, wherein the active operation mode of HARQ feedback may remain unchanged until a New Data Indicator (NDI) is switched. 16. A method, executed on a user equipment (user equipment, UE), comprising: receiving a HARQ bundling configuration, wherein the HARQ bundling configuration indicates that a number of sub-slots in a slot are bundled in a group for HARQ feedback; and HARQ feedback is performed according to the HARQ bundling configuration. 17. The method according to claim 16, wherein said number of sub-slots bundled in the group in a time slot is specified by a HARQ group index HARQGroupIndex having n bits, said constant n being related to a time related to the total number of subslots in the slot, denoted by SubslotNumperSlot, and

18. The method according to claim 17, wherein the group number of each time slot represented by groupNum is obtained by the following formula:

19. The method according to claim 16, wherein the HARQ bundling configuration can be carried in downlink control information (downlink control information, DCI) or radio resource control (radio resource control, RRC) signaling. 20. The method of claim 16, further comprising: The HARQ feedback bit sent is used as the HARQ feedback of the number of sub-slots bundled in the group in one slot, wherein the HARQ feedback bit is for all the sub-slots bundled in the group in one slot The HARQ-ACK information bits of the specified number of sub-slots are the result of the binary sum operation. 21. The method of claim 20, wherein the specified time for transmitting the HARQ feedback bits of the group is specified by the timing index of the last SPS PDSCH in the group. 22. The method of claim 16, further comprising: For the SPS PDSCH in a downlink radio frame, additional HARQ feedback bits in the uplink are preconfigured according to the number of slots in the downlink radio frame. 23. The method of claim 16, further comprising: For the SPS PDSCH in the downlink radio frame, additional HARQ feedback bits in the uplink are preconfigured according to the number of SPS PDSCH in the downlink radio frame. 24. The method of claim 16, further comprising: When a PUCCH resource collision occurs during the HARQ feedback, HARQ feedback bits related to different SPS PDSCHs are processed differently. 25. The method of claim 24, further comprising: The HARQ feedback bits are processed differently by prioritizing the HARQ feedback corresponding to the higher priority SPS PDSCH. 26. The method of claim 24, further comprising: The HARQ feedback bits are processed differently by prioritizing the HARQ feedback corresponding to the earlier SPS PDSCH. 27. A method, executable in a base station, comprising: transmitting a HARQ bundling configuration, wherein the HARQ bundling configuration refers to a number of sub-slots in a slot being bundled in a group for HARQ feedback; and Scheduling SPS PDSCH retransmissions in response to bundled HARQ feedback and said HARQ bundle configuration. 28. The method according to claim 27, wherein said number of sub-slots bundled in the group in one slot is specified by a HARQ group index HARQGroupIndex having n bits, said constant n being related to a time related to the total number of subslots in the slot, denoted by SubslotNumperSlot, and

29. The method according to claim 28, wherein the group number of each time slot represented by _groupNum is obtained by the following formula:

30. The method according to claim 27, wherein the HARQ bundling configuration can be carried in downlink control information (downlink control information, DCI) or radio resource control (radio resource control, RRC) signaling. 31. The method of claim 27, further comprising: The HARQ feedback bit sent is used as the HARQ feedback of the number of sub-slots bundled in the group in one slot, wherein the HARQ feedback bit is for all the sub-slots bundled in the group in one slot The HARQ-ACK information bits of the specified number of sub-slots are the result of the binary sum operation. 32. The method of claim 31, wherein the specified time for transmitting the HARQ feedback bits of the group is specified by the timing index of the last SPS PDSCH in the group. 33. The method of claim 27, further comprising: For the SPS PDSCH in a downlink radio frame, additional HARQ feedback bits in the uplink are preconfigured according to the number of slots in the downlink radio frame. 34. The method of claim 27, further comprising: For the SPS PDSCH in the downlink radio frame, additional HARQ feedback bits in the uplink are preconfigured according to the number of SPS PDSCH in the downlink radio frame. 35. A chip comprising: A processor configured to call and run the computer program stored in the memory, so that the device installed with the chip executes the method of claims 1 to 8. 36. A chip comprising: A processor configured to call and run the computer program stored in the memory, so that the device installed with the chip executes the method of claims 9 to 15. 37. A chip comprising: A processor configured to call and run the computer program stored in the memory, so that the device installed with the chip executes the method of claims 16 to 26. 38. A chip comprising: A processor configured to call and run the computer program stored in the memory, so that the device installed with the chip executes the method of claims 27 to 34. 39. A computer-readable storage medium having stored therein a computer program, wherein the computer program causes a computer to perform the method of claims 1-8. 40. A computer readable storage medium having stored therein a computer program, wherein the computer program causes a computer to perform the method of claims 9 to 15. 41. A computer readable storage medium having stored therein a computer program, wherein the computer program causes a computer to perform the method of claims 16 to 26. 42. A computer-readable storage medium having a computer program stored therein, wherein the computer program causes a computer to perform the method of claims 27-34. 43. A computer program product comprising a computer program, wherein said computer program causes a computer to carry out the method of claims 1 to 18. 44. A computer program product comprising a computer program, wherein said computer program causes a computer to carry out the method of claims 9 to 15. 45. A computer program product comprising a computer program, wherein said computer program causes a computer to carry out the method of claims 16 to 26. 46. A computer program product comprising a computer program, wherein said computer program causes a computer to carry out the method of claims 27 to 34. 47. A computer program, wherein said computer program causes a computer to perform the method of claims 1-8. 48. A computer program, wherein said computer program causes a computer to perform the method of claims 9 to 15. 49. A computer program, wherein said computer program causes a computer to carry out the method of claims 16 to 26. 50. A computer program, wherein said computer program causes a computer to perform the method of claims 27 to 34. 51. A user equipment (user equipment, UE), including: transceivers; and a processor coupled to the transceiver and configured to perform the following steps, comprising: receiving an indication of an active mode of operation for hybrid automatic repeat request (hybrid automatic repeat request, HARQ) feedback, wherein the indication indicates that the active mode of operation for HARQ feedback is one of an ACK-only mode and a NACK-only mode; and HARQ feedback is performed according to said active mode of operation for HARQ feedback. 52. The user equipment according to claim 51 , wherein when the indication indicates that the active mode of operation for HARQ feedback is the ACK-only mode, the processor performs the following steps, comprising: In the case of successful decoding of the semi-persistent scheduling (semi-persistent scheduling, SPS) physical downlink shared channel (PhysicalDownlink Shared Channel, PDSCH), send ACK; In the case of unsuccessful decoding of the SPS PDSCH, the sending of NACK is skipped. 53. The user equipment of claim 52, wherein the processor performs steps comprising: An ACK is sent in response to the release of the SPS PDSCH. 54. The user equipment according to claim 51 , when the indication indicates that the active mode of operation for HARQ feedback is the NACK-only mode, the processor performing the steps comprising: In response to successful decoding of SPS PDSCH, skip sending ACK; and A NACK is sent in response to the unsuccessful decoding of the SPS PDSCH. 55. The user equipment according to claim 54, wherein said processor performs steps comprising: sending an ACK in response to SPSPDSCH release. 56. The user equipment of claim 51 , wherein the indication of the active mode of operation of the HARQ feedback is determined from radio channel conditions associated with the UE. 57. The user equipment according to claim 56, wherein the wireless channel condition is represented by channel state information (CSI). 58. The user equipment according to claim 57, wherein the active operation mode of HARQ feedback may remain unchanged until a New Data Indicator (NDI) is switched. 59. A method, performed at a base station, comprising: transceivers; and a processor coupled to the transceiver and configured to perform the following steps, comprising: sending an indication of an active mode of operation for hybrid automatic repeat request (hybrid automatic repeat request, HARQ) feedback, wherein the indication indicates that the active mode of operation for HARQ feedback is one of ACK-only mode and NACK-only mode; and Send SPS PDSCH; and Retransmissions to said SPS PDSC are scheduled according to HARQ feedback and said active mode of operation for HARQ feedback. 60. The base station of claim 59, wherein when the indication indicates that the active mode of operation for HARQ feedback is the ACK-only mode, the processor performs the steps comprising: When no ACK related to the SPS PDSCH is received within the scheduled time, the SPS PDSCH is resent. 61. The base station according to claim 60, wherein when the SPS PDSCH is transmitted in n sub-slots, the scheduled timing is the n+k1th sub-slot. 62. The base station according to claim 59, wherein when said indication indicates that said active mode of operation for HARQ feedback is said NACK-only mode, said processor performs the following steps, comprising: retransmitting the SPS PDSCH in response to a NACK associated with the SPS PDSCH. 63. The base station according to claim 59, wherein the indication of the active mode of operation for HARQ feedback is determined based on radio channel conditions associated with the UE. 64. The base station according to claim 63, wherein the wireless channel condition is indicated by channel state information (CSI). 65. The base station according to claim 59, wherein the active operation mode of HARQ feedback may remain unchanged until a New Data Indicator (NDI) is switched. 66. A user equipment (user equipment, UE), including: transceivers; and a processor coupled to the transceiver and configured to perform the following steps, comprising: receiving a HARQ bundling configuration, wherein the HARQ bundling configuration indicates that a number of sub-slots in a slot are bundled in a group for HARQ feedback; and HARQ feedback is performed according to the HARQ bundling configuration. 67. The user equipment according to claim 66, wherein the number of sub-slots bundled in the group in a slot is specified by a HARQ group index HARQGroupIndex having n bits, the constant n being equal to a is related to the total number of subslots in a slot, denoted by SubslotNumperSlot, and

68. The user equipment according to claim 67, wherein the group number of each time slot represented by groupNum is obtained by the following formula:

69. The user equipment according to claim 66, wherein the HARQ bundling configuration can be carried in downlink control information (downlink control information, DCI) or radio resource control (radio resource control, RRC) signaling. 70. The user equipment of claim 66, wherein the processor performs steps comprising: The HARQ feedback bit sent is used as the HARQ feedback of the number of sub-slots bundled in the group in one slot, wherein the HARQ feedback bit is for all the sub-slots bundled in the group in one slot The HARQ-ACK information bits of the specified number of sub-slots are the result of the binary sum operation. 71. The user equipment according to claim 70, wherein the specified time for transmitting the HARQ feedback bits of the group is specified by the timing index of the last SPS PDSCH in the group. 72. The user equipment according to claim 66, said processor performing steps comprising: For the SPS PDSCH in a downlink radio frame, additional HARQ feedback bits in the uplink are preconfigured according to the number of slots in the downlink radio frame. 73. The user equipment of claim 66, wherein the processor performs steps comprising: For the SPS PDSCH in the downlink radio frame, additional HARQ feedback bits in the uplink are preconfigured according to the number of SPS PDSCH in the downlink radio frame. 74. The user equipment of claim 66, wherein the processor performs steps comprising: When a PUCCH resource collision occurs during the HARQ feedback period, HARQ feedback bits related to different SPS PDSCHs are processed differently. 75. The user equipment according to claim 74, wherein the processor performs steps comprising: The HARQ feedback bits are processed differently by prioritizing the HARQ feedback corresponding to the higher priority SPS PDSCH. 76. The user equipment of claim 74, wherein the processor performs steps comprising: The HARQ feedback bits are processed differently by prioritizing the HARQ feedback corresponding to the earlier SPS PDSCH. 77. A method, performed at a base station, comprising: transceivers; and a processor coupled to the transceiver and configured to perform the following steps, comprising: transmitting a HARQ bundling configuration, wherein the HARQ bundling configuration refers to a number of sub-slots in a slot being bundled in a group for HARQ feedback; and Scheduling SPS PDSCH retransmissions in response to bundled HARQ feedback and said HARQ bundle configuration. 78. The base station according to claim 77, wherein said number of subslots bundled in the group in one slot is specified by a HARQ group index HARQGroupIndex having n bits, said constant n being related to a time related to the total number of subslots in the slot, denoted by SubslotNumperSlot, and

79. The base station according to claim 78, wherein the group number of each time slot represented by _groupNum is obtained by the following formula:

80. The base station according to claim 77, wherein the HARQ bundling configuration can be carried in downlink control information (downlink control information, DCI) or radio resource control (radio resource control, RRC) signaling. 81. The base station of claim 77, wherein the processor performs steps comprising: The HARQ feedback bit sent is used as the HARQ feedback of the number of sub-slots bundled in the group in one slot, wherein the HARQ feedback bit is for all the sub-slots bundled in the group in one slot The HARQ-ACK information bits of the specified number of sub-slots are the result of the binary sum operation. 82. The base station according to claim 81, wherein the specified time for transmitting the HARQ feedback bits of the group is specified by the timing index of the last SPS PDSCH in the group. 83. The base station of claim 77, wherein the processor performs steps comprising: For the SPS PDSCH in a downlink radio frame, additional HARQ feedback bits in the uplink are preconfigured according to the number of slots in the downlink radio frame. 84. The base station of claim 77, wherein the processor performs steps comprising: For the SPS PDSCH in the downlink radio frame, additional HARQ feedback bits in the uplink are preconfigured according to the number of SPS PDSCH in the downlink radio frame.

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