Hybrid automatic repeat request method, semi-persistent scheduling method, and communication device

Abstract

A HARQ feedback method is provided, which includes: a base station configuring a first timing parameter for a user equipment (UE), wherein the first timing parameter is configured to indicate a time interval between a first time unit at which the UE receives a downlink transmission and a second time unit at which the UE sends a HARQ feedback signal of the downlink transmission to the base station; the base station determining that a collision occurs when the UE attempts to send the HARQ feedback signal; and the base station sending a downlink control information (DCI) to the UE, wherein the DCI carries a second timing parameter, the second timing parameter is different from the first timing parameter, and the second timing parameter is configured to adjust the second time unit to avoid the collision. The present disclosure further provides an SPS method, a related paging device and a non-transitory storage medium.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of communications, and in particular to a hybrid automatic repeat request method, a semi-persistent scheduling method and a communication device. BACKGROUND

[0002] Wireless communication systems and networks have evolved towards broadband mobile systems. In a cellular wireless communication system, user equipment (UE) is connected to a radio access network (RAN) over a wireless link. The RAN comprises a set of base stations (BS). The set of base stations can provide wireless links to a plurality of UEs located in cells covered by the set of base stations. The set of base stations can also provide an interface to a core network (CN) that provides control over the overall network. It will be appreciated that the RAN and CN each perform respective functions with respect to the overall network.

[0003] The Third Generation Partnership Project (3GPP) has developed a so-called Long Term Evolution (LTE) system, i.e. an Evolved Universal Mobile Telecommunications System Terrestrial Radio Access Network (E-UTRAN), for a mobile access network of one or more macro cells supported by base stations referred to as eNodeBs or eNBs (Evolved Node Bs). More recently, LTE has further evolved towards a so-called 5G or New Radio (NR) system, which one or more cells are supported by base stations referred to as gNBs.

[0004] When a UE receives a physical downlink shared channel (PDSCH) at a time slot n, the UE transmits a physical uplink control channel (PUCCH) with a hybrid automatic repeat request (HARQ) feedback signal for the PDSCH at a time slot n+K1, where K1 is a number of time slots indicated by a corresponding DCI or provided by a higher layer signal. If there is no available uplink (UL) resource in the time slot n+K1 because of a collision, the UE cancels the PUCCH transmission carrying the HARQ feedback signal for the PDSCH received at the time slot n. When the collision occurs frequently, the HARQ feedback signal is discarded frequently, which affects the performance of the PDSCH. SUMMARY

[0005] The present disclosure aims to provide a HARQ feedback method, a semi-persistent scheduling method, a communication device and a non-transitory storage medium.

[0006] According to a first aspect of the present disclosure, there is provided a HARQ feedback method comprising the following blocks.

[0007] A base station configures a first timing parameter for a user equipment (UE), wherein the first timing parameter is configured to indicate a time interval between a first time unit at which the UE receives a downlink transmission and a second time unit at which the UE transmits a HARQ feedback signal for the downlink transmission to the base station.

[0008] The base station determines that the UE has a collision when attempting to transmit the HARQ feedback signal.

[0009] The base station transmits, to the UE, a downlink control information (DCI) carrying a second timing parameter. The second timing parameter is different from the first timing parameter, and the second timing parameter is configured to adjust the second time unit to avoid the collision.

[0010] According to a second aspect of the disclosure, a HARQ feedback method is provided, comprising the following blocks.

[0011] The user equipment (UE) receives a first timing parameter transmitted by a base station. The first timing parameter is configured to indicate a time interval between a first time unit in which the UE receives a downlink transmission and a second time unit in which the UE transmits a HARQ feedback signal of the downlink transmission to the base station.

[0012] The UE receives a downlink control information (DCI) carrying a second timing parameter transmitted by the base station. The second timing parameter is different from the first timing parameter, and the second timing parameter is configured to adjust the second time unit to avoid a collision when the UE attempts to transmit the HARQ feedback signal.

[0013] The UE transmits, to the base station, the HARQ feedback signal of the downlink transmission at the adjusted second time unit.

[0014] According to a third aspect of the disclosure, a HARQ feedback method is provided. The method comprises the following blocks.

[0015] The base station determines that a user equipment (UE) has at least one cancelled HARQ feedback signal, wherein the at least one cancelled HARQ feedback signal is cancelled due to a collision.

[0016] The base station transmits, to the UE, a retransmission message and retransmission resource configuration information.

[0017] The base station receives the at least one cancelled HARQ feedback signal transmitted by the UE using the retransmission resource in response to the retransmission trigger message.

[0018] According to a fourth aspect of the disclosure, a HARQ feedback method is provided. The method comprises the following blocks.

[0019] The base station transmits, to a user equipment (UE), semi-persistent scheduling (SPS) transmission information. The SPS transmission information is configured to indicate whether there is an actual downlink transmission in at least one SPS resource.

[0020] The base station only detects hybrid automatic repeat request (HARQ) feedback signals corresponding to at least one SPS resource with actual downlink transmission and skips the operation of detecting HARQ feedback signals corresponding to SPS resources without actual downlink transmission.

[0021] According to a fifth aspect of the present disclosure, a method of semi-persistent scheduling (SPS) is provided. The method comprises the following blocks.

[0022] A base station transmits transmission information of semi-persistent scheduling (SPS) to a user equipment (UE). The transmission information of the SPS is configured to indicate whether at least one SPS resource has actual downlink transmission.

[0023] The base station only detects hybrid automatic repeat request (HARQ) feedback signals corresponding to at least one SPS resource with actual downlink transmission and skips the operation of detecting HARQ feedback signals corresponding to SPS resources without actual downlink transmission.

[0024] According to a sixth aspect of the present disclosure, a method of semi-persistent scheduling (SPS) is provided. The method comprises the following blocks.

[0025] A UE receives transmission information of semi-persistent scheduling (SPS) transmitted by a base station. The transmission information of the SPS is configured to indicate whether at least one SPS resource has actual downlink transmission.

[0026] The UE transmits hybrid automatic repeat request (HARQ) feedback signals corresponding to at least one SPS resource with actual downlink transmission to a base station and skips feedback signals corresponding to SPS resources without actual downlink transmission.

[0027] According to a seventh aspect of the present disclosure, a communication device is provided, comprising a processor and a communication circuit. The processor is connected to the communication circuit; and the processor is configured to execute instructions to perform the method provided in any one of the first aspect, the fourth aspect and the fifth aspect of the present disclosure.

[0028] According to an eighth aspect of the present disclosure, a communication device is provided, comprising a processor and a communication circuit. The processor is connected to the communication circuit; and the processor is configured to execute instructions to perform the method provided in any one of the second aspect, the third aspect and the sixth aspect of the present disclosure.

[0029] According to a ninth aspect of the present disclosure, a non-transitory storage medium is provided for storing instructions. The instructions are executable to perform the method provided in any one of the first aspect, the fourth aspect and the fifth aspect of the present disclosure.

[0030] According to a tenth aspect of the present disclosure, a non-transitory storage medium is provided for storing instructions. The instructions are executable to perform the method provided in any one of the second aspect, the third aspect and the sixth aspect of the present disclosure.

[0031] According to the present embodiment, in response to the conflict occurring when the HARQ feedback signal is sent, a new timing parameter (i.e., the second timing parameter) can be configured to adjust the second time unit at which the UE sends the HARQ feedback signal. In this way, the opportunity for the HARQ feedback signal to be discarded due to the conflict can be reduced, and the performance of the PDSCH (e.g., the SPS PDSCH) can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 A schematic diagram of a wireless communication system or network according to an embodiment of the present disclosure.

[0033] Figure 2 A flowchart of a HARQ feedback method according to an embodiment of the present disclosure.

[0034] Figure 3 A flowchart of a HARQ feedback method according to another embodiment of the present disclosure.

[0035] Figure 4 A flowchart of a HARQ feedback method according to yet another embodiment of the present disclosure.

[0036] Figure 5 A flowchart of a HARQ feedback method according to still another embodiment of the present disclosure.

[0037] Figure 6 A flowchart of an SPS method according to an embodiment of the present disclosure.

[0038] Figure 7 A flowchart of an SPS method according to another embodiment of the present disclosure.

[0039] Figure 8 A structural schematic diagram of a communication device according to an embodiment of the present disclosure.

[0040] Figure 9 A structural schematic diagram of a non-transitory storage medium according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0041] The present disclosure will be described in detail below with reference to the accompanying drawings and embodiments. Embodiments that do not conflict with each other can be combined together.

[0042] REFERENCES Figure 1, a telecommunication system is provided to perform a method according to embodiments of the disclosure. The telecommunication system includes a UE 10a, a UE 10b, a base station (BS) 200a, and a network entity device 300. The illustrated Figure 1 The number of UEs, the number of BSs, and the number of CN entities in the telecommunication system can be one or more for illustration purposes only and not limitation. The connections between the devices and the components of the devices are shown as lines and arrows in the drawings. The UE 10a can include a processor 11a, a non-transitory memory 12a, and a transceiver 13a. The UE 10b can include a processor 11b, a non-transitory memory 12b, and a transceiver 13b. The base station 200a can include a processor 201a, a non-transitory memory 202a, and a transceiver 203a. The network entity device 300 can include a processor 301, a non-transitory memory 302, and a transceiver 303. Each of the processors 11a, 11b, 201a, and 301 can be configured to implement the proposed functions, procedures, and / or methods described in the disclosure. Radio interface protocol layers can be implemented in the processors 11a, 11b, 201a, and 301. Each of the non-transitory memories 12a, 12b, 202a, and 302 can be operable to store various programs and information for operating the connected processors. Each of the transceivers 13a, 13b, 203a, and 303 can be operably coupled to the connected processors and transmit and / or receive radio signals or wired signals. The UE 10a can communicate with the UE 10b via a sidelink. The base station 200a can be one of an eNB, a gNB, or other types of radio nodes, and can be configured with radio resources provided to the UEs 10a and 10b.

[0043] Each of the processors 11a, 11b, 201a, and 301 can include application-specific integrated circuit (ASIC), other chipset, logic circuit and / or data processing device. Each of the non-transitory memories 12a, 12b, 202a, and 302 can include read-only memory (ROM), random access memory (RAM), flash memory, memory card, storage medium and / or other storage device. Each of the transceivers 13a, 13b, 203a, and 303 can include baseband circuitry and radio frequency circuitry for processing radio frequency (RF) signals. When the embodiments are implemented in software, the techniques described herein can be implemented using modules, programs, functions, entities, etc. stored in the non-transitory memory and executed by the processor. The memory can be implemented within the processor or external to the processor, in which case those can be communicatively coupled to the processor by various means as is known in the art.

[0044] The network entity apparatus 300 can be a node in a CN. The CN can include an LTE CN or a 5G core (5GC) including a user plane function (UPF), a session management function (SMF), a mobility management function (AMF), a unified data management (UDM), a policy control function (PCF), a control plane (CP) / user plane (UP) separation (CUPS), an authentication server (AUSF), a network slice selection function (NSSF), and a network exposure function (NEF).

[0045] Figure 1 A base station (e.g., BS 200a) and a UE (e.g., UE 10a or 10b) in a CN can perform the HARQ feedback method and the semi-persistent scheduling (SPS) method of the present disclosure. In the present disclosure, HARQ-ACK or HARQ-ACK feedback means a HARQ feedback signal that can be an acknowledgement (ACK) or a negative acknowledgement (NACK). A downlink control information (DCI) format is transmitted from a BS (e.g., BS 200a) to a UE (e.g., UE 10a or 10b). A radio resource control (RRC) parameter can include a parameter carried in an RRC control signal transmitted from a BS (e.g., BS 200a) to a UE (e.g., UE 10a or 10b).

[0046] As shown in FIG. 1, Figure 2 a flowchart of a HARQ feedback method according to an embodiment of the present disclosure is shown. In this embodiment, the method can include the following blocks.

[0047] In block S110, the base station can configure a first timing parameter for the UE.

[0048] The first timing parameter is configured to indicate a time interval between a first time unit and a second time unit. The UE can receive a downlink transmission at the first time unit and transmit a HARQ feedback signal of the downlink transmission to the base station at the second time unit. The units of the first time unit and the second time unit can be a slot, a subframe, or a symbol. When the first time unit and the second time unit are expressed in the same unit, the first timing parameter can be configured to indicate the number of timing units between the first time unit and the second time unit.

[0049] In block S120, the base station can determine that the UE has a collision when attempting to transmit the HARQ feedback signal.

[0050] In one embodiment, the first timing parameter can be applied to SPS PDSCH. SPS enables wireless resources to be scheduled in a semi-persistent manner (such wireless resources can be referred to as SPS resources configured for transmitting PDSCH in this embodiment), and the SPS resources are periodically configured to the UE. The base station can send an SPS configuration message to the UE for configuring the SPS. When the configuration is completed, the base station can send an SPS activation message to the UE. After the SPS is successfully activated, the UE can periodically receive downlink transmissions using the SPS resources. The SPS configuration message or the SPS activation message can include the first timing parameter.

[0051] However, a conflict can occur between the UE's attempt to transmit the HARQ feedback signal for the SPS PDSCH and the TDD configuration during the subsequent transmission of the SPS PDSCH, resulting in the failure of the transmission of the HARQ feedback signal for the SPS PDSCH.

[0052] In 3GPP Release 15, when the UE is configured with SPS PDSCH and receives the SPS PDSCH in slot n, the UE transmits PUCCH with HARQ-ACK in slot n+k1 for the SPS PDSCH. k1, referred to as the first timing parameter, is the number of slots indicated by the PDSCH-to-HARQ_feedback timing indicator in the corresponding downlink control information (DCI) format. When the field of the PDSCH-to-HARQ_feedback timing indicator is not present in the DCI format, the timing indicator can be provided by dl-DataToUL-ACKForDCIFormat1_2 or dl-DataToUL-ACK of DCI format 1_2. When there is no available UL resource in slot n+k1 due to a conflict with the TDD configuration, the UE cancels the PUCCH transmission carrying the HARQ-ACK for the SPS PDSCH received in slot n. In addition, in 3GPP Release 16, shorter SPS periodicities are supported to reduce latency. For each SPS PDSCH, the value of the timing indicator indicated by the activation DCI or higher layer control signal is the same. Shorter periodicity SPS PDSCHs can result in frequent conflicts of the transmission of HARQ-ACK with non-UL slots or symbols configured with a specific slot format indicated by semi-static or dynamic TDD configurations, especially when there is a large amount of downlink transmission. 3GPP TS 38.213 clause 11.1.1 defines the slot format. If the procedures of 3GPP standard Release 15 are reused, frequent conflict events and the discarding of HARQ feedback can be expected, which can degrade the performance of SPS PDSCH.

[0053] The conflict can be discovered by the UE, and then the UE can send a conflict report to the base station. Alternatively, since both the TDD configuration and the SPS PDSCH configuration are determined by the base station, the base station can identify the conflict by itself. Specifically, the base station can determine the first time unit of each downlink transmission according to the SPS configuration, and further determine the occurrence of the conflict according to the first time unit, the first timing parameter, and the TDD configuration. Before the UE discovers the occurrence of the conflict, the base station can be aware of the occurrence of the conflict according to its own configuration. When the updated configuration is given, the performance loss caused by the conflict can be more effectively avoided.

[0054] In block S130, the base station can send downlink control information (DCI) to the UE, and the DCI can carry the second timing parameter.

[0055] The second timing parameter is different from the first timing parameter, and the second timing parameter is configured to adjust the second time unit to avoid the occurrence of the conflict.

[0056] The base station can use a new DCI to indicate the second timing parameter (which can be referred to as a new k1). The new DCI can not be configured to schedule uplink or downlink transmission of the UE. That is, the DCI carrying the second timing parameter excludes scheduling information of uplink or downlink transmission of the UE. The first timing parameter and the second timing parameter can be indicated by the same field, such as PDSCH-to-HARQ_feedback.

[0057] The new DCI is essentially configured to send the second timing parameter to the UE. For SPS PDSCH, all necessary information has been configured in the initial DCI. Therefore, the new DCI can be simplified. For the simplified DCI, only the HARQ or PUCCH related parameters need to be updated, that is, only the HARQ or PUCCH related parameters need to be sent to the UE. For example, according to the specific situation, only the following parameters or part of the following parameters need to be updated:

[0058] - new data indicator

[0059] - redundancy version

[0060] - HARQ process number

[0061] - downlink assignment index

[0062] - TPC command for scheduled PUCCH

[0063] - PUCCH resource indicator

[0064] - PDSCH-to-HARQ_feedback timing indicator

[0065] In one embodiment, when the base station informs the related configuration through other scheduling manner, only the PDSCH-to-HARQ_feedback timing indicator can be updated to indicate the second timing parameter. For other parameters in the downlink DCI format, zero padding bits can be added. In another embodiment, in order to save resource overhead, a high layer parameter can be configured to indicate that the simplified DCI is performed, and the simplification operation of the parameters in the simplified DCI that are irrelevant to PUCCH can be ignored. On the other hand, the simplified DCI can be configured by a new radio network temporary identifier (RNTI). When the DCI format with CRC is scrambled by the new RNTI, the simplified DCI can be performed and the bits irrelevant to HARQ can be ignored. The alignment of the DCI size can also be performed, and any available mechanism in the related art can be used to align the DCI size, and the present disclosure is not limited in this regard.

[0066] In one embodiment, a new DCI format can be defined for the new DCI, which is specifically configured to carry the HARQ or PUCCH related parameters including the second timing parameter.

[0067] For example, the base station can configure the new DCI format by using the RRC information element (IE) TimmingIndPerSPSPDSCH. The HARQ or PUCCH related parameters contained in TimmingIndPerSPSPDSCH are shown in Table 1.

[0068] Table 1 HARQ or PUCCH related parameters in TimmingIndPerSPSPDSCH IE

[0069]

[0070] When the UE is provided with TimmingIndPerSPSPDSCH, the UE can be configured with a new RNTI denoted as TI-RNTI, which is provided by the Timing Indication (TI)-RNTI for monitoring the PDCCH that carries this new DCI format. dci-PayloadSizeForTI configures the total length of the DCI payload scrambled with TI-RNTI. ti-PayloadSize is the field size of each timing indicator for the SPS PDSCH of this servingCellId. PDSCH-to-HARQ-fb provides the PDSCH-to-HARQ_feedback timing indicator for each SPS PDSCH. positionInDCI provides the starting position (in number of bits) of the PDSCH-to-HARQ_feedback timing indicator for each SPS PDSCH within the DCI payload.

[0071] The new DCI carrying the second timing parameter can result in unnecessary signaling overhead. Therefore, the second timing parameter can be configured by an existing DCI that is used to schedule another PDSCH for the UE. In this example, the second timing parameter can be conveyed to the UE without increasing the signaling overhead.

[0072] The second timing parameter can be indicated by adding a field in the DCI, such as a PDSCH-to-HARQ_feedback_Backup field. The configuration of the PDSCH-to-HARQ_feedback_Backup field can reuse the legacy mechanism as a baseline. For example, the field can be configured by a higher layer parameter dl-DataToUL-ACK similar to PDSCH-to-HARQ_feedback, or a new dl-DataToUL-ACK-Backup is defined specifically for PDSCH-to-HARQ_feedback_Backup. To save signaling, this field can be optional and only configured when the k1 needs to be updated.

[0073] Another way is that an operation of reusing an existing timing indicator field can be performed to indicate the second timing parameter in the DCI.

[0074] In block S140, the base station can detect the HARQ feedback signal of the downlink transmission in a time unit determined by the base station according to the second timing parameter.

[0075] After receiving the new k1, the legacy mechanism can be reused for the second timing parameter. When the UE is configured with the DCI carrying the new k1 and receives the DCI in slot m, the UE transmits the PUCCH with HARQ-ACK for the SPS PDSCH in slot m + new k1. The base station can determine when to detect the PUCCH with HARQ-ACK according to the second timing parameter and the time unit in which the DCI carrying the new k1 is transmitted.

[0076] However, it is unclear whether the HARQ-ACK feedback corresponding to the subsequent SPS PDSCH should use the new k1 or the original k1 that caused the conflict. In the present embodiment, multiple solutions are provided, which are illustrated as follows.

[0077] The first solution is to override the old k1 with the new k1, that is, once the new k1 is configured, the HARQ-ACK feedback in response to the subsequent SPS PDSCH will be based on the new indicated k1 after receiving the DCI carrying the k1.

[0078] The second solution is that the new k1 is specifically for the cancelled HARQ-ACK feedback, that is, after sending this delayed HARQ-ACK feedback, the HARQ-ACK feedback in response to the subsequent SPS PDSCH is still based on the old k1. That is, the new k1 can only be used once.

[0079] The last solution is to keep both the new k1 and the original k1, and the UE can select the appropriate k1 for reporting. Accordingly, at the base station side, HARQ-ACK detection needs to be performed at two locations.

[0080] According to the present embodiment, in response to the conflict occurring when the HARQ feedback signal is transmitted, a new timing parameter (i.e., the second timing parameter) can be configured to adjust the second time unit in which the UE transmits the HARQ feedback signal. In this way, the opportunity for the HARQ feedback signal to be discarded due to the conflict can be reduced, and the performance of the PDSCH (e.g., SPS PDSCH) can be improved.

[0081] Alternatively, the HARQ feedback method mentioned in the present embodiment can be applied only to ultra-reliable low latency communication (URLLC) services. Low priority services can still follow the scheme of previous versions, discarding the HARQ-ACK if a conflict occurs. For this new k1, a restriction can be added, and the HARQ-ACK feedback also needs a certain real-time performance, which can not allow an indefinite delay. Therefore, the sum of the new k1 and the original k1 does not exceed the maximum supported range of the parameter k1. Alternatively, the time interval between the time unit of the final HARQ-ACK transmission and the time unit of the SPS PDSCH corresponding to the conflicting HARQ-ACK cannot exceed the maximum supported range of k1.

[0082] Ultra-reliable low latency communication or URLLC, as established in 3GPP Release 15, is one of the various use cases supported by the 5G NR standard. URLLC is a communication service for the successful delivery of demanding data packets, especially in terms of availability, latency, and reliability. URLLC will support emerging applications and services, with exemplary services including wireless control and automation in industrial factory environments, vehicle-to-vehicle communication to improve safety and efficiency, and the Internet of Things. This is quite important for 5G, especially considering the effective support of vertical industries that bring new business to the entire telecommunications industry.

[0083] One of the key features of URLLC is low latency. Low latency is important for self-driving cars or tools performing prostate surgery. Low latency allows the network to be optimized to handle an incredible amount of data with minimal delay (or latency). The network needs to adapt to a large amount of constantly changing data in real time. 5G can make this service work effectively. URLLC can be said to be the most promising of the upcoming 5G features, but it can also be the most difficult to ensure. The quality of service (QoS) required by URLLC is completely different from that of mobile broadband services. URLLC can bring instant and intelligent systems to the network, although it needs to transition from the core network.

[0084] As shown in FIG. 1 1, Figure 3 A flowchart of a HARQ feedback method according to another embodiment is provided. In this embodiment, the method can include the following blocks.

[0085] In block S210, the UE receives the first timing parameter sent by the base station.

[0086] Compared with the embodiment shown in FIG. 1 1, Figure 2 The execution subject of the method of the present embodiment can be the UE, while Figure 2 The execution subject of the method of the embodiment of FIG. 1 1 can be the base station. The common features or parts shown in the embodiments of the present embodiment and Figure 2 may refer to the description in Figure 2 without being repeated here.

[0087] The first timing parameter is configured to indicate the time interval between the first time unit in which the UE receives the downlink transmission and the second time unit in which the UE sends the HARQ feedback signal of the downlink transmission to the base station.

[0088] In block S220, the UE can determine that a collision occurred when attempting to send the HARQ feedback signal.

[0089] Specifically, the UE determined that a conflict occurred between its attempt to send the HARQ feedback signal and the time division multiplexing (TDD) configuration, causing the transmission of the HARQ feedback signal of the SPS PDSCH to fail.

[0090] In block S230, the UE sends a report of the collision to the base station.

[0091] Since the base station determines that the conflict has occurred on its own, the operations in S220-S230 can be omitted.

[0092] In block S240, the UE receives the DCI sent by the base station, which carries the second timing parameter.

[0093] The second timing parameter is different from the first timing parameter. The second timing parameter is configured to adjust the second time unit to avoid a conflict when the UE attempts to send the HARQ feedback signal.

[0094] In block S250, the UE sends the HARQ feedback signal of the downlink transmission to the base station in the adjusted second time unit.

[0095] The adjusted second time unit is determined based on the second timing parameter. According to this embodiment, in response to a collision occurring when transmitting the HARQ feedback signal, a new timing parameter (i.e., the second timing parameter) is configured to adjust the second time unit for the UE to transmit the HARQ feedback signal. This reduces the chance of the HARQ feedback signal being discarded due to a collision, improving the performance of the PDSCH (e.g., SPS PDSCH).

[0096] like Figure 4 As shown, a flowchart of a HARQ feedback method according to another embodiment is provided. Figure 4 In some embodiments, the method may include the following blocks.

[0097] In block S300, the UE notifies the base station that there is at least one canceled HARQ feedback signal, which was canceled due to a conflict.

[0098] The conflict can include at least one of a conflict between the HARQ feedback signal and a time division duplex (TDD) configuration and / or a conflict between the HARQ feedback signal and intra-UE uplink transmission. In response to the conflict being a conflict between the SPSPDSCH and the TDD configuration, the base station can determine by itself that there is one cancelled HARQ-ACK feedback and can not perform operation S300. The cancelled HARQ-ACK feedback can be cancelled due to the conflict.

[0099] In block S310, the UE receives the retransmission trigger message and the retransmission resource configuration message transmitted by the base station.

[0100] In view of compatibility with previous versions, a triggering mechanism is needed to determine whether to retransmit the at least one cancelled HARQ-ACK. The base station can transmit a retransmission trigger message to the UE and configure whether to allow retransmission of the cancelled HARQ-ACK. The retransmission trigger message can be carried by DCI or a higher layer signal (e.g., RRC). Therefore, a new parameter RetransCancelledHARQ can be defined. When the base station configures the parameter RetransCancelledHARQ to the UE, the UE packs and retransmits the at least one cancelled HARQ-ACK to the base station.

[0101] The retransmission resource message configures the UE with retransmission resources, which are uplink resources configured for retransmitting the at least one cancelled feedback signal. The retransmission resources can be newly configured uplink resources dedicated for retransmitting the cancelled HARQ-ACK. Alternatively, the retransmission resources can multiplex the cancelled HARQ feedback signal with existing PUCCH or PUSCH. When multiplexing is used, the base station should also consider the cancelled HARQ feedback signal when configuring the existing resources, and configure sufficient uplink resources for retransmitting the cancelled HARQ feedback signal.

[0102] ​For the configuration of the retransmission resource of the cancelled HARQ feedback signal due to the conflict with the TDD configuration, two factors can be referred to. One of the two factors is the configuration of the TDD, and the other is the number of actual transmitted SPS PDSCH (i.e., actual SPS PDSCH transmission). The base station is informed of the existence of the conflict, and therefore, according to the number of conflicts within a certain time window, the base station can configure the uplink resource according to this information. On this basis, there will also be a delay in the signal sent by the base station to the UE. During this period, new conflicts can also occur. Therefore, the base station can send based on the TDD configuration and the actual SPS PDSCH transmission, and consider additional resource configuration when allocating uplink resources. For the retransmission resource of the cancelled HARQ feedback signal due to the conflict of the UL transmission within the UE, the base station can configure the retransmission resource according to the conflict reported by the UE, and consider configuring additional uplink resources for new conflicts that can occur during the delay.

[0103] In block S320, in response to the retransmission trigger message, the UE sends the at least one cancelled HARQ feedback signal to the base station using the retransmission resource.

[0104] The UE sends at least part of the at least one cancelled HARQ feedback signal that has existed before receiving the retransmission trigger message and is cancelled due to the conflict to the base station using the retransmission resource.

[0105] For HARQ-ACK feedback, the default scheme is that the base station considers the transmission failure and automatically starts the retransmission mechanism in response to the UE not sending the feedback signal within a predetermined time.

[0106] Considering the timeliness of HARQ-ACK feedback, when the time interval between receiving the SPS PDSCH and making the HARQ-ACK feedback is too long, there is no need to perform retransmission. Therefore, a new parameter RetransCancelledHARQWin is introduced to indicate the time range to the UE. When the cancelled HARQ feedback signal is outside the time range, the feedback signal is not needed. For example, when the UE is configured with an SPS PDSCH, the HARQ feedback signal corresponding to the SPS PDSCH conflicts with the TDD configuration and is determined to be cancelled. The UE does not receive the retransmission trigger parameter RetransCancelledHARQ within the RetransCancelledHARQWin time after receiving the SPS PDSCH, and will no longer retransmit the cancelled HARQ feedback signal in response to the SPS PDSCH. In addition, referring to Figure 2The time window can also be defined by the maximum value of k1 according to the rule shown in the embodiments. When the cancelled HARQ feedback signal is not retransmitted within the range of the maximum value of k1, the HARQ feedback signal can be discarded.

[0107] In another embodiment, when the cancelled HARQ feedback signal is NACK, the base station can initiate the retransmission mechanism even if the UE does not provide the HARQ feedback signal. In another embodiment, when the cancelled HARQ feedback signal is ACK HARQ feedback signal, the base station initiates the retransmission in response to the UE not providing the feedback in time, which can cause resource waste. Therefore, the retransmission can only occur when the cancelled HARQ feedback signal is ACK. When the cancelled HARQ feedback signal is NACK, no retransmission can be performed, which accordingly improves the resource utilization. In another way, on the basis of the above-mentioned embodiments, all the cancelled HARQ feedback signals can be retransmitted only when most of them are ACK or there is an ACK. Further, when all the cancelled HARQ feedback signals are NACK, no retransmission can be performed.

[0108] Therefore, before the retransmission is performed, the number of first cancelled HARQ feedback signals in the at least one cancelled HARQ feedback signal is obtained, and / or the proportion of the number of the first cancelled HARQ feedback signals to the total number of the at least one cancelled HARQ feedback signal, wherein the first cancelled HARQ feedback signal satisfies a transmission condition. The UE can determine whether the number and / or the proportion of the first cancelled HARQ feedback signal satisfies a predetermined condition. The transmission condition includes at least one of the following: the first cancelled HARQ feedback signal is an ACK HARQ feedback signal; and the first cancelled HARQ feedback signal exists in a specific window before the retransmission trigger message is received. In response to the predetermined condition being satisfied, the at least one cancelled HARQ feedback signal can be transmitted to the base station using a retransmission resource. In response to the predetermined condition not being satisfied, the retransmission can be abandoned.

[0109] Further, in order to reduce the consumption of retransmission resources, the UE can perform a logical operation on at least two cancelled HARQ feedback signals to obtain an operation result, and can transmit the operation result to the base station using a retransmission resource.

[0110] According to the present embodiment, in response to the existence of the at least one cancelled HARQ feedback signal, the UE can retransmit the at least one cancelled HARQ signal to the base station. In this way, unnecessary PDSCH retransmission caused by the conflict of HARQ feedback signals can be reduced, and thus the performance of the PDSCH can be improved.

[0111] Alternatively, the HARQ feedback method provided in the embodiment can be applied only to URLLC services. However, low-priority services can still follow the scheme of the previous version, and the cancelled HARQ feedback signal is discarded if a conflict occurs.

[0112] As shown in Figure 5 , a flowchart of a HARQ feedback method according to still another embodiment of the disclosure is provided. In the embodiment, the method can include the following blocks.

[0113] In block S410, the base station can determine that there is at least one cancelled HARQ feedback signal in the UE, wherein the at least one cancelled HARQ feedback signal is cancelled due to a conflict.

[0114] Compared with the embodiment shown in Figure 4 , the execution subject of the method in the embodiment is a base station, while Figure 4 , the execution subject of the method in the embodiment is a UE. The common features or parts in the embodiments of Figure 4 and Figure 4 can be referred to the description in without being repeated.

[0115] The conflict includes at least one of a conflict between the HARQ feedback signal and a time division multiplexing (TDD) configuration and a conflict between the HARQ feedback signal and intra-UE uplink transmission. The base station can receive a notification sent by the UE about the existence of the at least one cancelled HARQ feedback signal. Alternatively, the base station can determine the existence of the cancelled HARQ feedback information based on the time division multiplexing (TDD) configuration and the semi-persistent scheduling (SPS) configuration message of the UE, the cancelled HARQ feedback information being cancelled due to a conflict between the HARQ feedback information and the TDD configuration.

[0116] In block S420, the base station can send a retransmission trigger message and a retransmission resource configuration message to the UE.

[0117] The retransmission trigger message is carried by a DCI or a radio resource control signal. The retransmission resource can be a newly configured uplink resource dedicated to retransmitting the at least one cancelled HARQ feedback signal, or the at least one cancelled HARQ feedback signal can be multiplexed with an existing PUCCH or PUSCH.

[0118] In block S430, the base station receives the at least one HARQ feedback signal sent by the UE using the retransmission resource in response to the retransmission trigger message.

[0119] Another way is that the retransmission trigger message includes time window information. The at least one cancelled HARQ feedback signal sent by the UE can be at least one HARQ feedback signal existing in a specific time window before the retransmission trigger message is received. The specific time window can be indicated by the time window information.

[0120] The UE can perform logical operation (e.g., binary AND operation, binary OR operation) on the at least one cancelled HARQ feedback signal to obtain an operation result, and can send the operation result to the base station using the retransmission resource.

[0121] According to the present embodiment, in response to the existence of the at least one cancelled HARQ feedback signal, the UE can retransmit the at least one cancelled HARQ feedback signal to the base station, wherein the at least one cancelled HARQ feedback signal is cancelled due to collision. In this way, unnecessary PDSCH retransmission caused by the at least one cancelled HARQ feedback signal can be reduced, and thus the performance of PDSCH (e.g., SPS PDSCH) can be improved.

[0122] As shown in FIG. 1, a flowchart of a SPS method according to an embodiment of the present disclosure is provided. In the present embodiment, the method can include the following blocks. Figure 6

[0123] In block S510, the base station sends transmission information of SPS to the UE.

[0124] SPS PDSCH configuration can be used to support periodic transmission traffic. Multiple downlink SPS configurations combined with shorter scheduling periods can reduce transmission delay of burst services. In some cases, SPS PDSCH resources can be over-configured, resulting in various SPS PDSCH occasions without actual downlink data transmission. According to the existing specification of NR, the UE needs to provide HARQ-ACK feedback for all SPS PDSCH, even if there is no actual downlink data transmission, i.e., skipping SPS PDSCH. In response to the skipped SPS PDSCH, the UE can provide a NACK feedback signal to the base station by default. In this way, unnecessary signaling overhead is undoubtedly increased.

[0125] ​In response to the feedback of the SPS PDSCH, the UE can employ an ACK-only mode. That is, the UE can only send ACK. When the HARQ feedback signal of the SPS PDSCH is NACK, the HARQ feedback signal is dropped. Since the base station knows whether there is actual downlink data transmission, even if the UE omits all the NACK feedback signals, the base station can determine by itself whether the transmission without feedback is a decoding failure or no actual downlink data is transmitted. For the transmission of decoding failure, the base station can schedule the retransmission of the failed transmission. For the transmission without actual downlink data, the base station can ignore the NACK. In order to trigger this scheme, the base station can configure a trigger parameter NACKSkipInd for the UE. For example, when NACKSkipInd = 1, the UE ignores the NACK feedback signal; when NACKSkipInd = 0, the UE can follow the original mechanism.

[0126] In this embodiment, the base station can use the transmission information of the SPS to indicate to the UE whether there is actual downlink transmission in at least one SPS resource. The transmission information of the SPS is configured to indicate whether there is actual downlink transmission in at least one SPS resource. The transmission information of the SPS can be included in the SPS configuration message or the SPS activation message, or indicated by a higher layer parameter. Another way is that after the SPS is activated, the base station can send the DCI or the higher layer parameter (such as RRC parameter) including the transmission information of the SPS to the UE. For example, after the SPS is activated, the base station can send the DCI including the transmission information of the SPS before each configured SPS resource, which can indicate that there is actual downlink transmission in the SPS resource.

[0127] The transmission information of the SPS can be in the form of a bit. The transmission information of the SPS can include at least one bit, and there is at least one SPS resource. The at least one bit can be one-to-one corresponding to the at least one SPS resource. The value of each bit in the at least one bit is set to indicate whether the corresponding SPS resource has actual downlink transmission. For example, each bit of the at least one bit being 1 can indicate that the corresponding SPS resource has actual downlink transmission; each bit of the at least one bit being 0 can indicate that the corresponding SPS resource has no actual downlink transmission. The base station can use a bitmap to indicate the transmission information of the SPS. The bitmap includes multiple fields, each field corresponding to an SPS resource, and the value of each field in the bitmap indicates whether the corresponding SPS resource has actual downlink transmission.

[0128] The DCI including the transmission information of the SPS can be a simplified DCI. The simplified DCI can refer to Figure 2The simplified DCI can also include a parameter indicating whether there is actual DL data transmitted in this embodiment. Similarly, parameters in the simplified DCI that are not related to the SPS transmission information can be omitted, and a new radio network temporary identity (RNTI) can be used to scramble the simplified DCI.

[0129] Alternatively, the DCI including the SPS transmission information can be a new DCI format. For example, the base station can configure the new DCI format using the RRC information element (IE) TimmingIndPerSPSPDSCH. The SPS transmission information related parameters included in the TimmingIndPerSPSPDSCH IE are shown in Table 2.

[0130] Table 2 SPS transmission information related parameters in the TimmingIndPerSPSPDSCH IE

[0131]

[0132] Actual-DL-TRX in the TimmingIndPerSPSPDSCH IE provides SPS transmission information to determine whether there is actual downlink transmission in the SPS PDSCH. For example, Actual-DL-TRX can be a bitmap configured to indicate the SPS transmission information. Alternatively, the SPS transmission information can be carried by other RRC IEs.

[0133] Reference Figure 2 In the embodiments of FIG. 1, the base station can periodically (e.g., once per SPS period, or once every few SPS periods) send DCI to the UE to indicate the HARQ parameters to be used by at least one subsequent SPS PDSCH, and / or to indicate whether there is actual downlink transmission in the subsequent SPS PDSCH after the SPS is activated.

[0134] In block S520, the base station only detects the HARQ feedback signals corresponding to at least one SPS resource with actual downlink transmission, and skips the operation of detecting the HARQ feedback signals corresponding to SPS resources without actual downlink transmission.

[0135] The base station knows the SPS resources without actual downlink transmission. Regardless of whether the UE sends HARQ feedback signals for the SPS resources without actual downlink transmission, the base station can skip the operation of detecting the HARQ feedback signals, and can detect the HARQ feedback signals corresponding to at least one SPS resource with actual downlink transmission.

[0136] According to the embodiment, the base station can use the transmission information of the SPS to indicate whether there is actual downlink transmission for the SPS resource corresponding to the UE. For the SPS PDSCH without actual downlink transmission, the UE can not send the HARQ feedback signal, which can reduce the number of HARQ feedback signals that the UE needs to send, and improve resource utilization, especially when the SPS PDSCH is over-configured.

[0137] As shown in FIG. 13, a flowchart of an SPS method according to yet another embodiment is shown. In this embodiment, the method can include the following blocks. Figure 7

[0138] In block S610, the UE can receive the SPS transmission information sent by the base station.

[0139] Compared with the embodiment shown in FIG. 13, the execution subject of the method of this embodiment can be the UE, while Figure 2 the execution subject of the method of the embodiment shown in FIG. 13 can be the base station. The common features or parts shown in the embodiments of this embodiment and Figure 2 may refer to the description in Figure 2 and will not be repeated here. Figure 2

[0140] The SPS transmission information can be included in the SPS configuration message or the SPS activation message, or can be indicated by a higher layer parameter. Another way is that after the SPS is activated, the base station can send the DCI or the higher layer parameter (e.g., RRC parameter) including the SPS transmission information to the UE.

[0141] The transmission information of the SPS can be in the form of bits. The transmission information of the SPS can include at least one bit, and there is at least one SPS resource. The at least one bit can be one-to-one corresponding to the at least one SPS resource. The value of each bit in the at least one bit is set to indicate whether the corresponding SPS resource has actual downlink transmission. A bitmap can be configured to indicate the transmission information of the SPS. The bitmap includes a plurality of fields, each field corresponding to an SPS resource, and the value of each field in the bitmap indicates whether the corresponding SPS resource has actual downlink transmission.

[0142] The DCI including the transmission information of the SPS can be a simplified DCI. The simplified DCI can refer to the embodiment shown in FIG. 14. In this embodiment, the simplified DCI can further include a parameter indicating whether there is actual DL data transmission. Similarly, the parameters in the simplified DCI that are irrelevant to the transmission information of the SPS can be omitted, and a new radio network temporary identifier (RNTI) can be used to scramble the simplified DCI. Another way is that the DCI including the transmission information of the SPS can be a new DCI format. Figure 2 ​​​

[0143] In block S620, the UE sends, to the base station, a HARQ feedback signal corresponding to at least one SPS resource with actual downlink transmission and skips the feedback signal corresponding to the SPS resource without actual downlink transmission.

[0144] According to the embodiment, the base station can use the transmission information of the SPS to indicate whether there is actual downlink transmission corresponding to the SPS resource of the UE. For the SPS PDSCH without actual downlink transmission, the UE does not send the corresponding HARQ feedback signal, and the base station does not detect the corresponding HARQ feedback signal. In this way, the number of HARQ feedback signals that the UE needs to send can be reduced, and the resource utilization can be improved, especially when the SPS PDSCH is over-configured.

[0145] Reference Figure 8 , Figure 8 is a structural schematic diagram of a communication device according to an embodiment of the present disclosure. The DCI scheduling apparatus 10 includes a processor 12 and a communication circuit 11. The processor 12 is connected with the communication circuit 11, and the processor 12 is configured to execute instructions to implement the method of scheduling DCI described above.

[0146] The processor 12 can include one or more instances of a processing circuit, i.e., a central processing unit (CPU), a processing unit, a processing circuit, a processor, an application-specific integrated circuit (ASIC), a microprocessor, or other processing logic that can interpret and execute instructions. Thus, as used herein the expression "processor" can mean a processing circuit set including one or more processing circuits (e.g., any, some or all of the ones listed above).

[0147] Reference Figure 9 , Figure 9 is a structural schematic diagram of a non-transitory storage medium according to an embodiment of the present disclosure. The memory stores instructions or program data 21, which when executed can implement the method proposed by the paging method according to the fourteenth embodiment of the present disclosure. The memory 12 can be a read-only memory (ROM), a random access memory (RAM), a flash memory, a hard disk or an optical disk, etc.

[0148] According to the embodiments of the present disclosure, it should be understood that the method and device can be implemented in other ways. For example, the device shown in the above embodiments is only exemplary. For example, the modules or units can be divided based on logical functions. In fact, the modules and units can be divided in other ways. For example, multiple units or components can be combined or integrated into another system. Or, certain features can be omitted or can not be implemented. Further, the coupling, directional coupling or communication connection as shown or discussed above can be implemented through some interfaces. The coupling or communication connection between the devices or units can be electrical, mechanical or other forms.

[0149] The units described as separate components can be physically or non-physically separated. The components shown as one unit can or can not be a physical unit. That is, the unit can be located in one location, or can be distributed in multiple network units. Part or all of these units can be selected and arranged to achieve the purpose of the present disclosure according to actual needs.

[0150] In addition, each functional unit of each embodiment can be integrated into one processing unit. Alternatively, each functional unit can be independently configured. Alternatively, two or more functional units can be integrated into one unit. The integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0151] The integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, which can be stored in a computer-readable non-transitory storage medium. Therefore, the essence of the present disclosure, the part of the present disclosure that contributes to the field, or the whole of the present disclosure can be implemented in the form of a software product. The computer software product is stored in a non-transitory storage medium and includes a plurality of instructions for causing a computing device (which can be a personal computer, a server, a network device, etc.) or a processor to perform some or all of the operations of the method shown in the embodiments of the present disclosure. The above-mentioned non-transitory storage medium can be any medium capable of storing program codes, such as a universal serial bus disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, an optical disk, etc.

[0152] The above is an embodiment of the present disclosure, but does not constitute a limitation on the patent scope of the present disclosure. Any equivalent structure or process transformation obtained based on the specification and drawings of the present disclosure, directly or indirectly applied to other related technologies, shall be included in the patent scope of the present disclosure.

Claims

1. A method for hybrid automatic repeat request (HARQ) feedback, the method comprising: Comprising: configuring, by a base station, a first timing parameter for a user equipment (UE), wherein the first timing parameter is configured to indicate a time interval between a first time unit in which the UE receives a downlink transmission and a second time unit in which the UE transmits a HARQ feedback signal for the downlink transmission to the base station; determining, by the base station, that a collision occurs when the UE attempts to transmit the HARQ feedback signal; transmitting, by the base station, a downlink control information (DCI) to the UE, wherein the DCI carries a second timing parameter, wherein the second timing parameter is different from the first timing parameter, and the second timing parameter is configured to adjust the second time unit to avoid the collision, and wherein the DCI carrying the second timing parameter does not include scheduling information for a downlink transmission or an uplink transmission of the UE.

2. The HARQ feedback method of claim 1, wherein, The configuring, by the base station, the first timing parameter for the UE comprises: transmitting, by the base station, a semi-persistent scheduling (SPS) configuration message or an SPS activation message to the UE, wherein the SPS configuration message or the SPS activation message includes the first timing parameter.

3. The HARQ feedback method of claim 1, wherein, The determining, by the base station, that the collision occurs when the UE attempts to transmit the HARQ feedback signal comprises: determining, by the base station, that a collision occurs between the HARQ feedback signal attempted to be transmitted by the UE and a time division duplex (TDD) configuration.

4. The HARQ feedback method of claim 3, wherein, The determining, by the base station, that the collision occurs between the HARQ feedback signal attempted to be transmitted by the UE and the TDD configuration comprises: determining, by the base station, the occurrence of the collision according to the first timing parameter, the first time unit, and the TDD configuration.

5. The HARQ feedback method of claim 1, wherein, The determining, by the base station, that the collision occurs when the UE attempts to transmit the HARQ feedback signal comprises: receiving, by the base station, a collision report transmitted by the UE.

6. The HARQ feedback method of claim 1, wherein, The DCI carrying the second timing parameter is a DCI for non-activated SPS.

7. The HARQ feedback method of claim 1, wherein, The DCI carrying the second timing parameter is a simplified DCI.

8. The HARQ feedback method of claim 7, wherein, Parameters irrelevant to a physical uplink control channel in the simplified DCI are omitted, and the simplified DCI is scrambled with a new radio network temporary identifier (RNTI).

9. The HARQ feedback method of claim 1, wherein, The DCI carrying the second timing parameter is a new DCI format.

10. The HARQ feedback method of claim 9, wherein, The new DCI format is scrambled with a TI-RNTI and is configured by an information element TimmingIndPerSPSPDSCH.

11. The HARQ feedback method of claim 1, wherein, The DCI carrying the second timing parameter includes PDSCH scheduling information of the UE.

12. The HARQ feedback method of claim 11, wherein, The second timing parameter is indicated by a PDSCH-to-HARQ_feedback_Backup field.

13. The HARQ feedback method of any of claims 1 to 12, characterized by, Further comprising: detecting, by the base station, a HARQ feedback signal for a downlink transmission in a time unit, wherein the time unit is determined by the base station according to the second timing parameter.

14. A method for hybrid automatic repeat request (HARQ) feedback, the method comprising: Comprising: A user equipment (UE) receives a first timing parameter transmitted by a base station, wherein the first timing parameter is configured to indicate a time interval between a first time unit at which the UE receives a downlink transmission and a second time unit at which the UE transmits a HARQ feedback signal of the downlink transmission to the base station; the UE receives a downlink control information (DCI) carrying a second timing parameter transmitted by the base station, wherein the second timing parameter is different from the first timing parameter, and the second timing parameter is configured to adjust the second time unit to avoid a collision when the UE attempts to transmit the HARQ feedback signal; and the UE transmits the HARQ feedback signal of the downlink transmission to the base station at the adjusted second time unit, wherein the DCI carrying the second timing parameter does not include scheduling information of a downlink transmission or an uplink transmission of the UE.

15. The HARQ feedback method of claim 14, wherein, The UE receiving the first timing parameter transmitted by the base station includes that the UE receives a semi-persistent scheduling (SPS) configuration message or an SPS activation message transmitted by the base station, wherein the SPS configuration message or the SPS activation message includes the first timing parameter.

16. The HARQ feedback method of claim 14, wherein, The UE receiving the DCI carrying the second timing parameter transmitted by the base station includes that the UE determines a collision when attempting to transmit the HARQ feedback signal; and the UE transmits a collision report to the base station.

17. The HARQ feedback method of claim 16, wherein, The UE determining the collision when attempting to transmit the HARQ feedback signal includes that the UE determines a collision between the HARQ feedback signal attempting to be transmitted and a time division duplex (TDD) configuration.

18. The HARQ feedback method of claim 14, wherein, The DCI carrying the second timing parameter is a DCI of non-activated SPS.

19. The HARQ feedback method of claim 14, wherein, The DCI carrying the second timing parameter is a simplified DCI.

20. The HARQ feedback method of claim 19, wherein, Parameters irrelevant to a physical uplink control channel in the simplified DCI are omitted, and the simplified DCI is scrambled with a new radio network temporary identifier (RNTI).

21. The HARQ feedback method of claim 14, wherein, The DCI carrying the second timing parameter is a new DCI format.

22. The HARQ feedback method of claim 21, wherein, The DCI of the new DCI format is scrambled with a TI-RNTI and is configured by an information element TimmingIndPerSPSPDSCH.

23. The HARQ feedback method of claim 14, wherein, The DCI carrying the second timing parameter includes PDSCH scheduling information of the UE.

24. The HARQ feedback method of claim 23, wherein, The second timing parameter is indicated by a PDSCH-to-HARQ_feedback_Backup field.

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