Feedback information transmission method and related apparatus

Abstract

The application provides a feedback information transmission method and related devices. A network device sends first configuration information to a terminal device, the first configuration information indicating a one-to-one correspondence relationship between M reference time units and a plurality of cells configured for sending HARQ feedback information; the network device sends a PDSCH to the terminal device, an ending symbol of the PDSCH being located in a first reference time unit; the terminal device and the network device determine a second reference time unit which is K1 reference time units away from the first reference time unit after the first reference time unit; and HARQ feedback information of the PDSCH is received on a target time unit of a target cell. The target cell is a cell corresponding to the second reference time unit in the one-to-one correspondence relationship, and the target time unit is a time unit of the target cell which overlaps with the second reference time unit. The method can align the resources and cells for transmitting the HARQ feedback information, and improve the transmission success rate of the feedback information.

Description

Technical Field

[0001] This application relates to the field of communication technology, and in particular to a feedback information transmission method and related apparatus. Background Technology

[0002] With the development of communication technology, higher requirements have been placed on communication systems in terms of transmission rate, latency, and power consumption. Ultra-Reliable and Low-Latency Communication (URLLC) is one of the three typical services of next-generation communication systems, with main application scenarios including autonomous driving and telemedicine. These application scenarios have more stringent requirements in terms of reliability and latency, such as data transmission reliability of 99.999%, transmission latency of less than 1ms, and minimizing command overhead while meeting high reliability and low latency requirements. Therefore, how to improve transmission latency and reliability has become a very important issue in this field.

[0003] To address this issue, a hybrid automatic repeat request (HARQ) technique can be employed. This technique introduces a forward error correction (FEC) scheme into the automatic retransmission request (ARQ) system. Within the error correction capability, FEC is used for automatic error correction; if the error correction capability is exceeded, the sending end is required to retransmit, thereby increasing system reliability.

[0004] However, when the terminal equipment supports carrier aggregation, the HARQ feedback information of the downlink shared channel transmitted on each carrier can only be sent on the primary cell (PCell) or the physical uplink control channel secondary cell (PUCCH SCell). This results in insufficient resources for transmitting the HARQ feedback information, leading to a low success rate of HARQ feedback information transmission. Summary of the Invention

[0005] This application provides a feedback information transmission method and related apparatus, which can improve the success rate of HARQ feedback information transmission.

[0006] In a first aspect, this application provides a feedback information transmission method, which can be executed by a terminal device or a module in the terminal device. The method includes: receiving first configuration information, the first configuration information indicating a one-to-one correspondence between M reference time units and multiple cells configured to send Hybrid Automatic Repeat Request (HARQ) feedback information within the M reference time units, where M is a positive integer; receiving a Physical Downlink Shared Channel (PDSCH), the end symbol of which is located in a first reference time unit among the M reference time units; and determining a second reference time unit among the M reference time units based on the first reference time unit, wherein the second reference time unit is after the first reference time unit, and the second reference time unit is spaced K1 reference time units from the first reference time unit, where K1 is an integer greater than or equal to zero. Based on the second reference time unit and the one-to-one correspondence, the target time unit on the target cell is determined, wherein the target cell is the cell corresponding to the second reference time unit in the one-to-one correspondence, and the target time unit is the time unit on the target cell that overlaps with the second reference time unit in the time domain; HARQ feedback information of PDSCH is transmitted on the target time unit of the target cell; wherein the M reference time units have the same time domain length, and the time domain length of the reference time unit is determined according to the first subcarrier interval, the first subcarrier interval being: the subcarrier interval with the largest value among the subcarrier intervals corresponding to multiple cells, or the subcarrier interval with the smallest value among the subcarrier intervals corresponding to multiple cells.

[0007] As can be seen, this feedback information transmission method can switch the HARQ feedback information to be sent on one of the target cells according to the one-to-one correspondence between the reference time unit and the cell indicated by the first configuration information, instead of being limited to sending on the PCell or PUCCH SCell, thereby improving the transmission success rate of HARQ feedback information.

[0008] In this embodiment, the correspondence indicated by the first configuration information can refer to all cells configured by the terminal device to send HARQ feedback information, or it can refer to a subset of cells configured to send HARQ feedback information. In one optional implementation, the first subcarrier spacing is the largest subcarrier spacing among the subcarrier spacings corresponding to each of the multiple cells. The time-domain length of the time unit determined in this implementation is the smallest among the time-domain lengths of the time units corresponding to the multiple cells. Compared to the time-domain length of the subcarrier spacing used when limited to PCell or PUCCH SCell feedback, using the time unit with the smallest time-domain length to transmit HARQ feedback information helps reduce feedback latency.

[0009] In another optional implementation, the first subcarrier spacing is the smallest subcarrier spacing among the subcarrier spacings corresponding to the multiple cells. The time-domain length of the time unit determined in this implementation is the largest among the time-domain lengths of the time units corresponding to the multiple cells. Compared to the time-domain length of the subcarrier spacing used when limited to PCell or PUCCH SCell feedback, using the time unit with the largest time-domain length to transmit HARQ feedback information is beneficial for selecting a moment with better channel quality within a longer time-domain duration to transmit HARQ feedback information, thereby improving the success rate of feedback information transmission.

[0010] In another optional implementation, the first subcarrier spacing is configured by the network device and used by the terminal device to determine the time domain length of the reference time unit. This allows the network device to adjust the time domain length of the reference time unit in a timely manner based on system load and channel conditions, thereby flexibly configuring the relationship between feedback delay and feedback success rate.

[0011] In another alternative implementation, the first subcarrier interval is predefined. This helps to save on the resource overhead and complexity required for configuration.

[0012] In one optional implementation, multiple time units on the target cell overlap with the second reference time unit in the time domain, and the target time unit is the earliest time unit in the time domain among the time units on the target cell that overlap with the second reference time unit. This implementation helps to reduce feedback latency.

[0013] In another optional implementation, multiple time units on the target cell overlap with the second reference time unit in the time domain. The target time unit is the latest time unit in the time domain among the time units on the target cell that overlap with the second reference time unit. This implementation allows the target time unit to be as late as possible in the time domain, avoiding the terminal device from discarding feedback information due to insufficient data processing capabilities, thereby improving the success rate of feedback information transmission.

[0014] In addition, when multiple cells have multiple corresponding subcarrier intervals, the network device can flexibly indicate the configuration method of the above-mentioned optional first subcarrier, which solves the problem that the HARQ feedback information transmission success rate is low when the first subcarrier interval can only be the subcarrier interval of PCell or PUCCH SCell.

[0015] In one optional implementation, K1 is indicated by the downlink control information (DCI) for scheduling the PDSCH, and K1 is a value in the K1 set. For ease of explanation, in an optional implementation of the K1 set, the time unit for transmitting HARQ feedback information is simply referred to as the feedback time unit.

[0016] In one optional implementation, the K1 set is the K1 set configured in the cell where the PDSCH resides. This allows the determination of the feedback time unit to be based on the required feedback delay of the PDSCH in that cell and / or the uplink transmission capability of the terminal equipment.

[0017] In another optional implementation, the K1 set is the K1 set configured in the primary cell accessed by the terminal device. Thus, when determining the feedback time unit, the required feedback delay of the primary cell's PDSCH and / or the uplink transmission capability of the terminal device can be considered.

[0018] In another optional implementation, the K1 set is the K1 set configured among multiple cells that has the smallest subcarrier spacing. This is beneficial because it allows for consideration of the feedback delay required for the PDSCH of the cell with the smallest subcarrier spacing, based on the feedback time unit determined by the K1 set.

[0019] In another optional implementation, there are multiple cells with the smallest subcarrier spacing among multiple cells. The K1 set is the K1 set configured on the cell with the smallest or largest index among the cells with the smallest subcarrier spacing among multiple cells. This is beneficial when there are multiple cells with the smallest subcarrier spacing among multiple cells, the network device and the terminal device adopt an aligned K1 set.

[0020] In another optional implementation, the K1 set is the K1 set configured for the cell with the largest subcarrier spacing among multiple cells. Thus, when determining the feedback time unit, the required feedback delay of the PDSCH for the cell with the largest subcarrier spacing can be taken into account.

[0021] In another optional implementation, there are multiple cells with the smallest subcarrier spacing among multiple cells. The K1 set is the K1 set configured on the cell with the smallest or largest index among the cells with the largest subcarrier spacing among multiple cells. This is beneficial when there are multiple cells with the largest subcarrier spacing among multiple cells, the network device and the terminal device adopt an aligned K1 set.

[0022] In another optional implementation, the K1 set is configured by the network device to determine the feedback time unit and the cell that sends HARQ feedback information in that feedback time unit, in conjunction with the first configuration information. This allows the network device to adjust the relationship between feedback delay and feedback success rate in a timely manner based on system load and channel status, using the K1 set associated with the first configuration information.

[0023] In another optional implementation, the K1 set is a predefined K1 set associated with the first configuration information. This helps to save on the resource overhead and complexity required for configuration.

[0024] In the above optional implementation, the K1 set is no longer limited to the K1 set configured on the PCell or PUCCH SCell, thereby further improving the flexibility of HARQ feedback information transmission.

[0025] Secondly, this application also provides a feedback information transmission method, which is executed by a network device or a module in the network device. The method includes: sending first configuration information, the first configuration information indicating a one-to-one correspondence between M reference time units and multiple cells configured to send Hybrid Automatic Repeat Request (HARQ) feedback information within the M reference time units, where M is a positive integer; sending a Physical Downlink Shared Channel (PDSCH), the end symbol of which is located in a first reference time unit among the M reference time units; and determining a second reference time unit among the M reference time units based on the first reference time unit, wherein the second reference time unit is after the first reference time unit, and the second reference time unit is spaced K1 reference time units from the first reference time unit, where K1 is an integer greater than or equal to zero. Based on the second reference time unit and the one-to-one correspondence, the target time unit on the target cell is determined, wherein the target cell is the cell corresponding to the second reference time unit in the one-to-one correspondence, and the target time unit is the time unit on the target cell that overlaps with the second reference time unit in the time domain; HARQ feedback information of PDSCH is received on the target time unit of the target cell; wherein the M reference time units have the same time domain length, and the time domain length of the reference time unit is determined according to the first subcarrier spacing, the first subcarrier spacing being: the subcarrier spacing with the largest value among the subcarrier spacings corresponding to multiple cells, or the subcarrier spacing with the smallest value among the subcarrier spacings corresponding to multiple cells.

[0026] In this regard, the relevant implementation methods and beneficial effects of the feedback information transmission method can be found in the relevant description of the first aspect above, and will not be elaborated here.

[0027] Thirdly, this application provides another method for transmitting feedback information, which is executed by a terminal device or a module within the terminal device. This feedback information transmission method includes:

[0028] Receive first configuration information, which is used to indicate the one-to-one correspondence between M reference time units and multiple cells in the M reference time units configured to send Hybrid Automatic Repeat Request (HARQ) feedback information, where M is a positive integer;

[0029] Receive the Physical Downlink Shared Channel (PDSCH), where the end symbol of the PDSCH is located in the first reference time unit among the M reference time units;

[0030] The second reference time unit is determined from among M reference time units based on the first reference time unit. The second reference time unit is after the first reference time unit, and the second reference time unit is separated from the first reference time unit by K1 reference time units, where K1 is an integer greater than or equal to zero.

[0031] Based on the second reference time unit and the one-to-one correspondence, the first time unit on the first cell is determined, wherein the first cell is the cell corresponding to the second reference time unit in the one-to-one correspondence, and the first time unit is the time unit on the first cell that has time domain overlap with the second reference time unit.

[0032] When the first physical uplink control channel (PUCCH) resource overlaps with downlink symbols or flexible symbols in the time domain, a second time unit is determined. The second time unit is located after the first time unit. The first PUCCH resource is the PUCCH resource of the first cell, located within the first time unit, and configured to carry HARQ feedback information of the PDSCH.

[0033] The second PUCCH resource in the second time unit transmits the HARQ feedback information of the PDSCH. The second PUCCH resource does not overlap with the downlink symbol and the flexible symbol in the time domain.

[0034] As can be seen, when the first PUCCH resource overlaps with a downlink symbol or flexible symbol in the time domain, the terminal device can switch the HARQ feedback information to be sent in other time units. This solves the problem of low data transmission reliability caused by the HARQ feedback information being discarded due to the overlap between the first PUCCH resource and the downlink symbol or flexible symbol. Therefore, this feedback information transmission method can improve the success rate of HARQ feedback information transmission.

[0035] The second time unit is the time unit on the second cell.

[0036] In one optional implementation, the second cell is the first cell, and the second time unit is the earliest available time unit in the time domain among at least one available time unit in the second cell. The candidate PUCCH resources in each available time unit do not overlap with downlink symbols or flexible symbols. This implementation can transmit HARQ feedback information in a timely manner through time domain switching, avoiding the problem of HARQ feedback information being discarded due to overlap between PUCCH resources and downlink symbols or flexible symbols, thus improving the transmission success rate of HARQ feedback information.

[0037] In another optional implementation, the second cell is one of the multiple cells other than the first cell. This implementation is advantageous because when the first PUCCH resource overlaps with downlink symbols or flexible symbols in the time domain, HARQ feedback information can be transmitted in a timely manner by switching between the time and frequency domains. This avoids the problem of HARQ feedback information being dropped due to overlap between PUCCH resources and downlink symbols or flexible symbols, thus improving the transmission success rate of HARQ feedback information.

[0038] In this optional implementation, one possible approach is that the second cell is the cell corresponding to the third reference time unit in the one-to-one correspondence among M reference time units. The second time unit is a time unit on the second cell that overlaps with the third reference time unit in the time domain. The third reference time unit is the earliest available reference time unit in the time domain among at least one available reference time unit. Each available reference time unit is located after the second reference time unit, and the cell corresponding to each available reference time unit in the one-to-one correspondence is an available candidate cell. The candidate PUCCH resources in the third time unit of the available candidate cell do not overlap with downlink symbols and flexible symbols. The third time unit is a time unit on the available candidate cell that overlaps with the reference time unit corresponding to the available candidate cell in the one-to-one correspondence.

[0039] As can be seen, this implementation can select the earliest reference time unit in the time domain from at least one available reference time unit, and then obtain the second cell based on this one-to-one correspondence to send HARQ feedback information. This solves the problem that HARQ feedback information cannot be sent when the first PUCCH resource overlaps with downlink symbols or flexible symbols in the first time unit, thus improving the success rate of HARQ feedback information transmission.

[0040] In this alternative implementation, another possible approach is that the second cell is a default cell, which can be predefined or pre-configured. The second time unit is the earliest available time unit in the time domain among at least one available time unit on the second cell, and the candidate PUCCH resources on each available time unit do not overlap with downlink symbols and flexible symbols.

[0041] As can be seen, this implementation can switch the HARQ feedback information to be sent on the second time unit of other cells when the first PUCCH resource overlaps with the downlink symbol or flexible symbol in the first time unit, thereby improving the success rate of HARQ feedback information transmission.

[0042] In one of the optional implementations described above, the candidate PUCCH resource configuration is used to carry the HARQ feedback information. The candidate PUCCH resource can be determined based on the total number of bits of HARQ feedback information supported for transmission on the third time unit, which will not be described in detail here.

[0043] In one optional implementation, in this feedback information transmission method, the M reference time units have the same time domain length, and the time domain length of the reference time units is determined according to the first subcarrier interval.

[0044] Possible implementations of the first subcarrier spacing can be found in the possible implementations of the first subcarrier spacing described in the first aspect above, and will not be detailed here. Alternatively, in another optional implementation of this aspect, the first subcarrier spacing is the subcarrier spacing of the default cell described above.

[0045] In one optional implementation, if multiple time units on the first cell overlap with the second reference time unit in the time domain, then the first time unit is the earliest time unit in the time domain among the overlapping time units on the first cell. Similarly, the second time unit can also be determined in this way. This implementation helps reduce feedback latency.

[0046] In another optional implementation, if multiple time units on the first cell overlap with the second reference time unit in the time domain, then the first time unit is the latest time unit in the time domain among the time units on the first cell that overlap with the second reference time unit. Similarly, the second time unit can also be determined in this way. This implementation ensures that the target time unit is as late as possible in the time domain, avoiding the terminal device discarding feedback information due to insufficient data processing capabilities, thereby improving the success rate of feedback information transmission.

[0047] In one optional implementation, K1 is the downlink control information (DCI) indication that schedules the PDSCH, and K1 is a value in a set of K1. Optional implementations of this set of K1 can be found in the relevant content described in the first aspect above, and will not be detailed here.

[0048] Fourthly, this application also provides a feedback information transmission method, which corresponds to the feedback information transmission method described in the third aspect, and is executed by a network device or a module in the network device. The method includes: sending first configuration information, the first configuration information indicating a one-to-one correspondence between M reference time units and multiple cells configured to send Hybrid Automatic Repeat Request (HARQ) feedback information within the M reference time units, where M is a positive integer; sending a Physical Downlink Shared Channel (PDSCH), the end symbol of which is located in the first reference time unit among the M reference time units; determining a second reference time unit among the M reference time units based on the first reference time unit, wherein the second reference time unit is after the first reference time unit, and the second reference time unit is spaced K1 reference time units apart from the first reference time unit, where K1 is an integer greater than or equal to zero; and determining a first reference time unit based on the second reference time unit and the one-to-one correspondence. The first time unit on the cell, wherein the first cell is the cell corresponding to the second reference time unit in the one-to-one correspondence, and the first time unit is a time unit on the first cell that overlaps with the second reference time unit in the time domain; when the first physical uplink control channel (PUCCH) resource overlaps with downlink symbols or flexible symbols in the time domain, a second time unit is determined, the second time unit is located after the first time unit, the first PUCCH resource is the PUCCH resource of the first cell located within the first time unit, configured to carry the HARQ feedback information of the PDSCH; the second PUCCH resource within the second time unit receives the HARQ feedback information of the PDSCH, and the second PUCCH resource does not overlap with downlink symbols and flexible symbols in the time domain.

[0049] For detailed implementation methods and beneficial effects, please refer to the relevant content described in the third aspect above, which will not be elaborated here.

[0050] Fifthly, this application provides a communication device, which can be a terminal device, a device within a terminal device, or a device compatible with a terminal device. The communication device can also be a chip system. The communication device can execute the methods described in the first or third aspect. The functions of the communication device can be implemented in hardware or by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions. The unit or module can be software and / or hardware. The operations performed by the communication device and its beneficial effects can be found in the methods described in the first or third aspect and their beneficial effects.

[0051] Sixthly, this application provides a communication device, which can be a network device, a device within a network device, or a device compatible with a network device. The communication device can also be a chip system. The communication device can execute the methods described in the second or fourth aspect. The functions of the communication device can be implemented in hardware or by hardware executing corresponding software. The hardware or software includes one or more units or modules corresponding to the above functions. These units or modules can be software and / or hardware. The operations performed by the communication device and its beneficial effects can be found in the methods described in the second or fourth aspect and their beneficial effects.

[0052] In a seventh aspect, this application provides a communication device, which includes a processor and an interface circuit. The interface circuit is configured to receive signals from other communication devices outside the communication device and transmit them to the processor, or to send signals from the processor to other communication devices outside the communication device. The processor is configured to implement the method described in any one of the first to fourth aspects through logic circuits or execution code instructions.

[0053] Eighthly, this application provides a computer-readable storage medium storing instructions that, when executed by a communication device, implement the method described in any one of the first to fourth aspects.

[0054] Ninthly, this application provides a computer program product including instructions that, when read and executed by a communication device, cause the communication device to perform a method as described in any one of the first to fourth aspects.

[0055] In a tenth aspect, this application provides a communication system comprising at least one communication device for performing the method described in the first aspect and at least one communication device for performing the method described in the second aspect, or comprising at least one communication device for performing the method described in the third aspect and at least one communication device for performing the method described in the fourth aspect. Attached Figure Description

[0056] Figure 1 This is a schematic diagram of the structure of a communication system 100;

[0057] Figure 2 This is a schematic diagram of a feedback information transmission method with the uplink subcarrier spacing being the same as the downlink subcarrier spacing.

[0058] Figure 3 This is a schematic diagram of a feedback information transmission method with the example that the uplink subcarrier spacing is different from the downlink subcarrier spacing;

[0059] Figure 4 This is a schematic diagram of the structure of a time slot configured with downlink symbols, flexible symbols, and uplink symbols;

[0060] Figure 5 This is a schematic diagram of the transmission method of feedback information of each PDSCH in carrier aggregation;

[0061] Figure 6 This is a flowchart illustrating the feedback information transmission method 100 provided in an embodiment of this application;

[0062] Figure 7 This is a schematic diagram of the first correspondence indicated by the first configuration information provided in the embodiments of this application;

[0063] Figure 8 This is an example schematic diagram of the feedback information transmission method 100 provided in the embodiments of this application;

[0064] Figure 9 This is another example schematic diagram of the feedback information transmission method 100 provided in the embodiments of this application;

[0065] Figure 10 This is another example schematic diagram of the feedback information transmission method 100 provided in the embodiments of this application;

[0066] Figure 11 This is another example schematic diagram of the feedback information transmission method 100 provided in the embodiments of this application;

[0067] Figure 12 This is a flowchart illustrating the feedback information transmission method 200 provided in an embodiment of this application;

[0068] Figure 13 This is an example schematic diagram of the feedback information transmission method 200 provided in the embodiments of this application;

[0069] Figure 14 This is another example schematic diagram of the feedback information transmission method 200 provided in the embodiments of this application;

[0070] Figure 15 This is another example schematic diagram of the feedback information transmission method 200 provided in the embodiments of this application;

[0071] Figure 16 This is another example schematic diagram of the feedback information transmission method 200 provided in the embodiments of this application;

[0072] Figure 17 This is a schematic diagram of the distribution of BWP;

[0073] Figure 18 This is a schematic diagram of a time slot format configuration for two cells;

[0074] Figure 19 This is a schematic diagram of the structure of the communication device 1900 provided in the embodiments of this application;

[0075] Figure 20 This is a schematic diagram of the structure of the communication device 2000 provided in the embodiments of this application. Detailed Implementation

[0076] The specific embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0077] This application can be applied to standalone networks, i.e., new base stations, backhaul links, and core networks deployed in future networks, as well as to various communication systems such as non-standalone networks.

[0078] For example, the technical solution of this application can be used in 5th generation (5G) systems, also known as new radio (NR) systems, 6th generation (6G) systems, 7th generation (7G) systems, or other future communication systems; or it can be used in device-to-device (D2D) systems, machine-to-machine (M2M) systems, long term evolution (LTE) systems, carrier aggregation (CA) systems, and dual connectivity (DC) systems, etc. In CA or DC scenarios, the terminal device can connect to two base stations simultaneously, and can be provided by these two base stations. One or both base stations can be NR base stations, such as gNBs, where one base station can be the master node (MN), and the other base station can provide services to the terminal device through the addition of secondary carriers or secondary base stations.

[0079] For example, but not limited to, the feedback information transmission method described in this application can be applied to, for example... Figure 1 The communication system shown. Figure 1 This is a schematic diagram of a communication system 100. The communication system 100 may include, but is not limited to, multiple network devices (such as network device 101, network device 102), and one or more terminal devices (such as terminal device 103). These multiple network devices can schedule the same terminal, providing downlink services to one terminal or receiving uplink services from one terminal. The network devices can communicate with each other via the Xn interface.

[0080] Optional, Figure 1In the communication system 100 shown, network device 102 can add network device 101 as a secondary carrier or secondary base station. Additionally, terminal devices can send capability information to network device 102, and network device 102 can determine whether to add network device 101 using a CA system or a DC system based on the capability information reported by the terminal devices.

[0081] In this embodiment, the network device may be a device with wireless transceiver functionality or a chip that can be configured in the device. The network device includes, but is not limited to: evolved node B (eNB), radio network controller (RNC), node B (NB), base station controller (BSC), base transceiver station (BTS), home network device (e.g., home evolved Node B, or home Node B (HNB), baseband unit (BBU), access point (AP) in a wireless fidelity (WIFI) system, wireless repeater node, wireless backhaul node, and transceiver node. Points (TRPs) and transmission points (TPs) can also be used in 5G, 6G, and even 7G systems, such as gNBs in NR systems, or transmission points (TRPs or TPs), one or a group of antenna panels (including multiple antenna panels) of network equipment in 5G systems, or network nodes that constitute gNBs or transmission points, such as baseband units (BBUs), distributed units (DUs), or roadside units (RSUs) in vehicle-to-everything (V2X) or intelligent driving scenarios.

[0082] In some deployments, a gNB or transport point may include a centralized unit (CU) and sub-DUs. A gNB or transport point may also include a radio unit (RU). The CU implements some of the functions of the gNB or transport point, and the DU implements some of the functions of the gNB or transport point. For example, the CU implements radio resource control (RRC) and packet data convergence protocol (PDCP) layer functions, while the DU implements radio link control (RLC), media access control (MAC), and physical (PHY) layer functions. Since RRC layer information ultimately becomes physical layer information, or is transformed from physical layer information, in this architecture, higher-layer signaling, such as RRC layer signaling or PDCP layer signaling, can also be considered as being sent by the DU, or by the DU+RU. It is understood that network devices can be CU nodes, DU nodes, or devices including both CU and DU nodes.

[0083] In addition, the CU can be classified as a network device in the radio access network (RAN), i.e., access network device, or it can be classified as a network device in the core network (CN), abbreviated as core network device, without any restriction.

[0084] In this application embodiment, the terminal device may include, but is not limited to: user equipment (UE), access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, user agent, or user device, etc. For example, the terminal device may be a mobile phone, tablet computer, computer with wireless transceiver capabilities, virtual reality terminal device, augmented reality terminal device, wireless terminal in industrial control, wireless terminal in autonomous driving, wireless terminal in telemedicine, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, wireless terminal in the aforementioned V2X vehicle-to-everything (V2X) network, or a wireless terminal type RSU, etc.

[0085] To facilitate a clear description of the technical solutions in the embodiments of this application, the terms "first" and "second" are used in the embodiments of this application to distinguish identical or similar items with essentially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and that "first" and "second" are not necessarily different. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0086] The relevant concepts involved in this application will be explained below.

[0087] 1. Time Unit

[0088] Communication systems contain various time units (also referred to as time-domain units). A time unit can be one or more radio frames, one or more subframes, one or more time slots, one or more micro-time slots, one or more symbols, and so on. A symbol can be an orthogonal frequency division multiplexing (OFDM) symbol or a discrete fourier transform spread spectrum orthogonal frequency division multiplexing (DFT-S-OFDM) symbol. A radio frame has a duration of 10 ms, a subframe has a duration of 1 ms, and a time slot includes 14 symbols in the case of a normal cyclic prefix and 12 symbols in the case of an extended cyclic prefix. The cyclic prefix is ​​formed by moving the signal from the tail of a symbol to the head.

[0089] 2. Data scheduling method

[0090] Data scheduling can be categorized into two methods: semi-static scheduling and dynamic scheduling. These will be explained in detail below.

[0091] 2.1 Semi-static scheduling method

[0092] In semi-static scheduling, the network device configures one or more sets of semi-persistent scheduling (SPS) configuration information for the terminal device and informs the terminal device of the SPS configuration information used through an activated physical downlink control channel (PDCCH). This SPS configuration information specifies the scheduling period. Additionally, the activated PDCCH can indicate the time-frequency resource where the physical downlink share channel (PDSCH) resides. Thus, the terminal device can receive PDSCH on the indicated time-frequency resource in each period. Therefore, this semi-static scheduling method does not require the network device to send a PDCCH before each PDSCH transmission. The PDSCHs scheduled using this semi-static scheduling method can be simply referred to as SPS PDSCHs.

[0093] The following is a brief introduction to SPS configuration information and PDCCH activation. In addition, to ensure transmission reliability, the HARQ feedback information used to indicate the PDSCH reception status is also introduced.

[0094] A set of SPS configuration information includes: (1) the index (or identifier) ​​corresponding to the set of SPS configuration information; (2) the period (e.g., the period can be as low as 10ms); and (3) the physical uplink control channel (PUCCH) resource configuration. The PUCCH resource configuration is mainly used to configure which resources are PUCCH resources, such as which symbols in the period. PUCCH resources can be used to carry uplink control information. In this application, the uplink control information includes HARQ feedback information, which may specifically include HARQ-ACK or HARQ-NACK information.

[0095] The downlink control information (DCI) carried by the activation PDCCH can be called the activation DCI. It indicates the time slot where the SPS PDSCH is located, as well as the start symbol S and length L in that time slot. For example, after receiving the transmission, the terminal device will determine the HARQ feedback information of the PDSCH and send the HARQ feedback information to the network device so that the network device can determine whether the PDSCH needs to be retransmitted.

[0096] The aforementioned DCI activation can also indicate the time unit where the HARQ feedback information of each SPS PDSCH is located. For example, DCI activation can indicate a parameter K1, and the field indicating parameter K1 can be called the K1 indication field, which in DCI is the "PDSCH-to-HARQ_feedback timing indicator" field. This parameter K1 can correspond to one K1 value in a K1 set, representing the number of time slots between the time slot where an SPS PDSCH is located and the time slot where the HARQ feedback information of that SPS PDSCH is located. This K1 set is a set of higher-layer signaling configurations, which is the "dl-DataToUl-ACK" field in the PUCCH resource configuration.

[0097] The time domain length of the time unit varies depending on the subcarrier spacing value. For example, the time domain length of a time slot with a subcarrier spacing of 15 kHz is twice that of a time slot with a subcarrier spacing of 30 kHz. Therefore, when determining the feedback time unit, the uplink and downlink subcarrier spacing must also be considered.

[0098] For example, Figure 2 Taking the example that the uplink subcarrier spacing is the same as the downlink subcarrier spacing, that is, the time domain length of each time slot in the uplink and downlink is the same, such as... Figure 2 As shown, the slot where the SPS PDSCH is located is slot n. The parameter K1 indicated by the activation DCI has a corresponding K1 value of 4 in the K1 set. Therefore, the HARQ feedback information of the terminal device for this SPS PDSCH is fed back in slot n+4.

[0099] Optionally, if the uplink subcarrier spacing differs from the downlink subcarrier spacing, it is necessary to determine the uplink time slot corresponding to the end time of the SPS PDSCH, and then determine the time slot where the HARQ feedback information of the SPS PDSCH is located based on the K1 value. For example, Figure 3 Taking an uplink subcarrier spacing of 30kHz and a downlink subcarrier spacing of 15kHz as an example, the length of the downlink time slot is twice the length of the uplink time slot. Therefore, assuming that the uplink time slot corresponding to the end time of the SPS PDSCH transmitted on downlink slot m is slot n, and the K1 value corresponding to the parameter K1 indicated by the activation DCI in the K1 set is 4, then the HARQ feedback information of the terminal device for this SPS PDSCH is fed back on the uplink slot n+4.

[0100] In addition to determining the feedback time slot, it is also necessary to know the PUCCH resources that transmit HARQ feedback information within that feedback time slot. For ease of explanation, the resources in this time slot are referred to as feedback resources. Based on the total number of bits of HARQ feedback information required to be fed back in this feedback time slot, the terminal device selects one PUCCH resource from the multiple PUCCH resources configured for the terminal device by the network device that matches the total number of bits of the HARQ feedback information, and uses this resource as the feedback resource.

[0101] For example, if a network device configures four PUCCH resources for a terminal device, and the total number of bits in the HARQ feedback information is less than or equal to 2, then the first PUCCH resource can be used as the feedback resource; if the total number of bits in the HARQ feedback information is between 3 and N1, then the second PUCCH resource can be used as the feedback resource; if the total number of bits in the HARQ feedback information is between N1 and N2, then the third PUCCH resource can be used as the feedback resource; and if the total number of bits in the HARQ feedback information is between N2 and N3, then the fourth PUCCH resource can be used as the feedback resource. Here, 3 < N1 < N2 < N3. Optionally, N1, N2, and N3 are indicated by the configuration information sent by the network device, or are a default value of 1706.

[0102] Furthermore, the SPS PDSCH in semi-static scheduling can be either the first SPS PDSCH to activate DCI scheduling, or an SPS PDSCH that is periodically transmitted according to the period P configured in the SPS configuration information. Whether it's the first SPS PDSCH or subsequent periodically transmitted SPS PDSCHs that do not require DCI scheduling, the time slot containing the corresponding HARQ feedback information is determined using the parameter K1 indicated by the activated DCI, as described above; details will not be elaborated here. In the semi-static scheduling method, the first SPS PDSCH can be referred to as a PDSCH with scheduling information, and subsequent PDSCHs can be referred to as PDSCHs without scheduling information.

[0103] 2.2. Dynamic Scheduling Method

[0104] In dynamic scheduling, one PDCCH schedules the transmission of one PDSCH. Therefore, before each PDSCH transmission, the network device needs to send a PDCCH. That is, in dynamic scheduling, each PDSCH has scheduling information.

[0105] In this method, the DCI, as described above, activates and indicates the time slot (as described above, parameter K0) where the scheduled PDSCH is located, as well as the start symbol S and length L in that time slot. It also indicates the time slot (as described above, parameter K1) where the HARQ feedback information of the PDSCH is located, which will not be detailed here. In this method, the HARQ feedback information and feedback time unit are the same as in the semi-static scheduling method described in 1.1 above, and will not be detailed here. However, in the dynamic scheduling method, the method for determining the feedback resource differs from the semi-static scheduling method described in 1.1 above.

[0106] In the dynamic scheduling mode, after the terminal device determines the total number of bits of HARQ feedback information to be transmitted in the feedback time unit, the terminal device selects a PUCCH resource set based on the total number of bits; the terminal device selects a PUCCH resource from the PUCCH resource set as the feedback resource according to the PUCCH Resource Indicator (PRI) in the DCI.

[0107] For example, the network device configures K (1≤K≤4) PUCCH resource sets for the terminal device; each PUCCH resource set can include multiple PUCCH resources and a resource list. The resource list stores the IDs of the PUCCH resources. For instance, if the total number of bits in the HARQ feedback information is ≤2 bits, the first PUCCH resource set is selected; if 2 bits < the total number of bits in the HARQ feedback information is ≤N1 bits, the second PUCCH resource set is selected; if N1 bits < the total number of bits in the HARQ-ACK feedback information is ≤N2 bits, the third PUCCH resource set is selected; and if N2 bits < the total number of bits in the HARQ-ACK feedback information is ≤N3 bits, the fourth PUCCH resource set is selected. Then, a PUCCH resource is selected from the selected PUCCH resource sets as the feedback resource. Optionally, N1, N2, and N3 are indicated by the configuration information sent by the network device, or are the default value of 1706.

[0108] 3. Time slot configuration

[0109] Time slot configuration information indicates which symbols in a slot are downlink symbols, which are flexible symbols, and which are uplink symbols. Alternatively, it can be understood as indicating the positions and ratios of uplink, downlink, and flexible symbols within a slot. Uplink symbols are used to transmit uplink information, downlink symbols are used to transmit downlink information, and flexible symbols can be used to transmit either uplink or downlink information.

[0110] For example, such as Figure 4As shown, in the configurable time slots of the network device, symbols 0 to 2 are downlink symbols (labeled D), symbols 3 to 11 are flexible symbols (labeled F), and symbols 12 to 13 are uplink symbols (labeled U).

[0111] Optionally, if the PUCCH resource containing the HARQ feedback information experiences one of the following conflicts, the HARQ feedback information on that PUCCH resource will be canceled from being sent:

[0112] In case (1), if the PUCCH resource encounters a semi-static downlink symbol, that is, the PUCCH resource corresponds to a semi-static downlink symbol, the HARQ feedback information on the PUCCH resource will be canceled. For example, the PUCCH resource is symbols 2 to 4, but symbols 2 to 4 are configured as downlinks through the semi-static method described in method (1) or method (2) above.

[0113] Case (2): The PUCCH resource encounters a dynamic downlink symbol or a downlink symbol where a dynamically scheduled PDSCH is located.

[0114] Case (3): The PUCCH resource encounters a semi-static flexible symbol, and the terminal device is also configured with an SFI. If the SFI does not configure the flexible symbol as a dynamic uplink symbol.

[0115] The aforementioned conflict can also be referred to as the overlap of PUCCH resources with downlink resources or flexible resources in the time domain. The downlink resources may include downlink symbols, and the flexible resources may include flexible symbols. Therefore, it can also be referred to as the overlap of PUCCH resources with downlink symbols or flexible symbols in the time domain.

[0116] 4. Carrier Aggregation (CA)

[0117] Carrier aggregation (CA) allows downlink transmission using multiple carriers, achieving greater bandwidth and higher downlink rates. Within CA, terminal equipment can support multiple cells, which can form cell groups, such as master cell groups (MCGs) and secondary cell groups (SCGs). An MCG includes multiple cells; the cell initiating initial access is called the primary cell (PCell), and the remaining cells are called secondary cells (SCells). The PCell and SCells within the MCG are combined through carrier aggregation. Similarly, an SCG also includes multiple cells, with one cell similar to the PCell in the MCG, called the primary secondary cell (PSCell). Likewise, the PSCell and SCells within the SCG can also be combined through carrier aggregation.

[0118] As mentioned above, both the semi-static and dynamic scheduling methods employ the HARQ mechanism described above to send HARQ feedback information in order to ensure transmission reliability.

[0119] To determine the feedback time unit and resources for HARQ feedback information, the terminal device needs to know not only the parameter K1 and the total number of bits in the HARQ feedback information, but also the K1 set, the optional PUCCH resource set, and the PUCCH resources. The K1 set, the optional PUCCH resource set, and the PUCCH resources are provided to the terminal device through the cell's PUCCH configuration information.

[0120] In MCG, if no PUCCH SCell is configured, PUCCH configuration information only exists on the PCell. If a SCell is configured as a PUCCH SCell, then that PUCCH SCell also has PUCCH configuration information. The PUCCH configuration information on the PCell may differ from that on the PUCCH SCell. Each PUCCH configuration information includes the K1 set mentioned above and multiple PUCCH resource sets. Similar to MCG, in SCG, PSCell, or both PSCell and SCells configured as PUCCH SCells, also have PUCCH configuration information.

[0121] Taking MCG as an example, such as Figure 5As shown, the PCell and PUCCH SCell contain PUCCH configuration information. In this MCG, the PCell and some SCells perform HARQ feedback on the PCell. The PCell and these SCells (such as SCell#1, SCell#4) form a PUCCH group (e.g., ...). Figure 5 The PUCCH Group #1 is shown; another part of the SCells performs HARQ feedback on the PUCCH SCell, and this part of the SCells forms another PUCCH group (such as...). Figure 5 The PUCCH Group#2 shown is mentioned. Figure 5 Taking the example that the subcarrier spacing of PCell, SCell#1, SCell#4, SCell#5, and SCell#6 is the same, if the subcarrier spacing is different, the terminal device needs to determine the feedback time unit (i.e., the feedback time slot) based on the time slot corresponding to the end symbol of PDSCH on PCell or PUCCH SCell, and the K1 value indicated by the K1 indication field in the DCI corresponding to PDSCH in the configured K1 set.

[0122] In this embodiment, a cell can be a logical concept, and may include one or more carriers, while a carrier can be a physical concept. Therefore, in this embodiment, a cell can be replaced with a carrier, and multi-carrier aggregation can also be understood as cooperation between multiple cells.

[0123] When the terminal device supports carrier aggregation, HARQ feedback information from multiple cells can only be transmitted on PCell or PUCCHSCell, resulting in insufficient resources for transmitting HARQ feedback information on PCell or PUCCHSCell. Furthermore, due to the time slot configuration described above, the conflict situations described in (1) to (3) will occur, and the information cannot be sent or will be directly discarded, resulting in a low transmission success rate of HARQ feedback information.

[0124] This application provides a feedback information transmission method 100. In this method 100, the terminal device can transmit HARQ feedback information in the target time unit of the target cell by switching between the reference time unit indicated by the first configuration information and the configured cells for transmitting HARQ feedback information, through switching between the time domain and / or frequency domain. This increases the flexibility of time and frequency resources for transmitting HARQ feedback information and helps improve the transmission success rate of HARQ feedback information.

[0125] This application also provides a feedback information transmission method 200. When the first PUCCH resource overlaps with a downlink symbol or flexible symbol in the time domain, the feedback information transmission method 200 switches the HARQ feedback information to other time units for transmission. This solves the problem of low data transmission reliability caused by the HARQ feedback information being discarded due to the overlap between the PUCCH resource and the downlink symbol or flexible symbol. Therefore, this feedback information transmission method can improve the transmission success rate of HARQ feedback information. In other words, when there is a resource conflict in the first PUCCH resource, such as in the situations described in (1) to (3) above, the feedback information transmission method 200 switches the HARQ feedback information to a later time unit for transmission, or switches the HARQ feedback information to another cell for transmission, or to another time unit of another cell for transmission. This solves the problem of the HARQ feedback information being discarded due to the overlap between the PUCCH resource and the downlink symbol or flexible symbol, thereby improving the transmission success rate of HARQ feedback information.

[0126] The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0127] Example 1. Feedback information transmission method 100.

[0128] Please see Figure 6 , Figure 6 This is a flowchart illustrating a feedback information transmission method provided in an embodiment of this application, such as... Figure 6 As shown, the feedback information transmission method 100 includes, but is not limited to, the following steps:

[0129] S101, the network device sends first configuration information, which is used to indicate the one-to-one correspondence between M reference time units and multiple cells in the M reference time units configured to send Hybrid Automatic Repeat Request (HARQ) feedback information; accordingly, the terminal device receives the first configuration information.

[0130] In this context, a one-to-one correspondence means that one of the M reference time units corresponds to one of the cells indicated by the base station for sending HARQ feedback information. For example, in this correspondence, one of the reference time units is time unit #1, which corresponds to SCell #3 indicated by the base station for sending HARQ feedback information. Then, during the time domain start symbol to time domain end symbol of time unit #1, the cell used to send feedback information is SCell #3.

[0131] For ease of description, this article will refer to the "one-to-one correspondence" as "correspondence"; and the multiple cells configured to send Hybrid Automatic Repeat Request (HARQ) feedback information in the M reference time units will be referred to as multiple cells.

[0132] Among them, different reference time units in the M reference time units can correspond to the same cell or different cells, and this application does not impose any restrictions.

[0133] For example, Table 1 shows one example of a one-to-one correspondence. Indices 0 to 4 indicate five reference time units, and the multiple cells in the one-to-one correspondence are SCell#1, SCell#2, SCell#3, and SCell#4, respectively. Each of the five reference time units corresponds to one of the four cells in the one-to-one correspondence. Among them, indices 0 and 3 indicate the same cell, while the other indices indicate different cells.

[0134] Table 1

[0135]

[0136]

[0137] Optionally, the first configuration information in the above embodiments can be indicated by the base station to the terminal device through a cell group configuration information element (CellGroupConfig Information Element). It can also be indicated to the terminal device implicitly or explicitly. Explicit indication can be indicated through higher-layer signaling, such as RRC signaling.

[0138] In one optional approach, the first configuration information displays a one-to-one correspondence between M reference time units and multiple cells; that is, the first configuration information includes information about the M reference time units, information about the multiple cells, and information about the one-to-one correspondence. For example... Figure 7 The image shows an example of the first configuration information, such as... Figure 7 In this context, during the duration from the start symbol to the end symbol of time unit #1, a corresponding cell for transmitting feedback information is designated as SCell #3, and so on. For example, in this method, the first configuration information may include information on multiple reference time units in the first column of Table 1, as well as information on multiple cells in the second column and the correspondence between them.

[0139] In another optional approach, the first configuration information may not include information on the M reference time units, but may include information on multiple cells and information on one-to-one correspondences. In this case, the correspondence between the multiple cells and reference time units indicated in the first configuration information can be predefined or configured. For example, multiple cells may correspond one-to-one with the M reference time units arranged in chronological order in the time domain, thereby obtaining the one-to-one correspondence between the reference time units and cells indicated by the first configuration information. For example, Table 1 shows an example of the first configuration information. In this case, the first configuration information may include information on multiple cells in the right column of Table 1. By predefining the time units corresponding to the multiple cells as the first to fifth time units in the time domain order, the first configuration information implicitly indicates the one-to-one correspondence between the M time units and the multiple cells.

[0140] Optionally, the first configuration information may also be in other forms to enable the terminal device to obtain the correspondence indicated by the first configuration information, and this application does not limit it.

[0141] The M reference time units have the same time domain length, and the time domain length of the reference time units is determined according to the first subcarrier spacing. The optional implementations of the first subcarrier spacing may include, but are not limited to, the implementations described below.

[0142] S102. The network device sends the PDSCH, and the corresponding terminal device receives the PDSCH.

[0143] The end symbol of this PDSCH is located in the first reference time unit among the M reference time units.

[0144] Optionally, the first reference time unit is the reference time unit where the end symbol of the PDSCH is located. When the subcarrier spacing of the cell where the PDSCH is located is equal to the first subcarrier spacing, since the time domain length of the reference time unit is the same as that of the time unit in the cell where the PDSCH is located, the first reference time unit can be described as the time unit where the end symbol of the PDSCH is located. When the subcarrier spacing of the cell where the PDSCH is located is not equal to the first subcarrier spacing, since the time domain length of the reference time unit is different from that of the time unit in the cell where the PDSCH is located, the first reference time unit is described as the reference time unit where the end symbol of the PDSCH is located.

[0145] Optionally, the network device may send a DCI before step S102. This DCI can dynamically schedule the PDSCH or be used to activate the SPS PDSCH with the SPS configuration information described above. Accordingly, before step S102, the terminal device may receive the DCI and receive the corresponding PDSCH according to the DCI.

[0146] S103. The network device determines the second reference time unit among the M reference time units based on the first reference time unit, and determines the target time unit on the target cell based on the second reference time unit and the correspondence. Correspondingly, the terminal device also determines the second reference time unit among the M reference time units based on the first reference time unit, and determines the target time unit on the target cell based on the second reference time unit and the correspondence.

[0147] The second reference time unit follows the first reference time unit, and is spaced K1 reference time units apart from the first reference time unit, where K1 is an integer greater than or equal to zero. Optionally, if the first subcarrier spacing is the same as the subcarrier spacing of the cell where the PDSCH is located, i.e., the time domain length of the reference time unit is equal to the time domain length of the time unit where the PDSCH is located, then the second reference time unit can be described as a time unit spaced K1 time units apart from the time unit where the PDSCH is located.

[0148] K1 is the DCI indication for scheduling PDSCH. K1 is a value in the K1 set, determined by combining the K1 set as described above. In this application, the optional implementations of the K1 set may include, but are not limited to, the implementations described below. The value of K1 can be an integer greater than or equal to 0. For example, if the value of K1 is 0, then the second reference time unit and the first reference time unit are the same time unit; if the value of K1 is 1, then the second reference time unit is the reference time unit adjacent to the first reference time unit; if the value of K1 is 2, then the index of the second reference time unit is equal to the index of the first reference time unit plus 2, identifying the reference time unit.

[0149] Wherein, the target cell is the cell corresponding to the second reference time unit in the correspondence indicated by the first configuration information, and the target time unit is a time unit in the target cell that overlaps with the second reference time unit in the time domain. Optionally, if the first subcarrier spacing is the same as the subcarrier spacing of the cell where the PDSCH is located, then the target time unit is a time unit in the target cell that is K1 time units apart from the time unit where the PDSCH is located.

[0150] In one optional implementation, if multiple time units on the target cell overlap with the second reference time unit in the time domain, then the target time unit is the earliest time unit among the time units on the target cell that overlap with the second reference time unit in the time domain. This implementation helps to reduce feedback latency.

[0151] In another optional implementation, if multiple time units on the target cell overlap with the second reference time unit in the time domain, then the target time unit is the latest time unit in the time domain among the time units on the target cell that overlap with the second reference time unit. This implementation ensures that the target time unit is as late in the time domain as possible, avoiding the terminal device discarding feedback information due to insufficient data processing capabilities, thereby improving the success rate of feedback information transmission.

[0152] S104. The terminal device sends the HARQ feedback information of the PDSCH in the target time unit of the target cell; correspondingly, the network device receives the HARQ feedback information of the PDSCH in the target time unit of the target cell.

[0153] As can be seen, this feedback information transmission method, based on the correspondence between the reference time unit and the cell indicated by the first configuration information, can switch the HARQ feedback information to one of the target cells for transmission, instead of being limited to transmission on the main cell PCell or PUCCH SCell, thereby improving the transmission success rate of HARQ feedback information. In other words, this feedback information transmission method, by specifying the switching rules of HARQ feedback information in the time domain and / or frequency domain, enables terminal devices and network devices to align the target time unit and target cell for transmitting HARQ feedback information, improving the transmission success rate of HARQ feedback information and enhancing communication reliability.

[0154] Figure 6 In the feedback information transmission method 100 shown, since the subcarrier intervals corresponding to the multiple cells indicated by the first configuration information are different, how should the first subcarrier interval be determined? This application provides the following optional solutions.

[0155] In implementation 1.1, the first subcarrier spacing is configured by the network device to determine the time domain length of the reference time unit.

[0156] This allows network devices to adjust the time domain length of the reference time unit in a timely manner based on system load and channel conditions through the first subcarrier interval, thereby flexibly configuring the relationship between feedback delay and feedback success rate.

[0157] For example, suppose the network device is configured with a first subcarrier spacing of 30kHz, and multiple cells configured to send HARQ feedback information are PCell, SCell#1, SCell#2, SCell#3, and SCell#4. The subcarrier spacings corresponding to these cells are as follows: Figure 8 As shown. Assuming PDSCH is on PCell, then the reference time unit where the end symbol of PDSCH is located is as follows: Figure 8The diagram shows time unit #1. Assuming the K1 indicator field in the DCI of the PDSCH scheduling is 00, and the used K1 set is {1, 2, 3, 4}, then the value of K1 is 1. Therefore, the second reference time unit is one reference time unit apart from the first reference time unit, i.e., as shown... Figure 8 The time unit #2 shown is as indicated by the first configuration information. Figure 8 The correspondence shown indicates that the target cell is the second reference time unit, i.e., SCell #2 corresponding to time unit #2; the target time unit is the time unit on SCell #2 that overlaps with time unit #2 in the time domain, such as... Figure 8 The target time unit is shown. Therefore, the terminal device can send HARQ feedback information on this target time unit of SCell#2 to indicate the reception status of the PDSCH.

[0158] The terminal device can determine the PUCCH resource from the target time unit according to the semi-static scheduling method or dynamic scheduling method described above, in order to send the HARQ feedback information. For example, the PUCCH resource where the HARQ feedback information is located is as follows: Figure 8 The PUCCH in the target time unit shown.

[0159] As can be seen, this feedback information transmission method can switch the HARQ feedback information of PDSCH to be sent on the time unit of SCell#2 according to the first configuration information, thereby solving the problem of low transmission success rate of HARQ feedback information caused by only being able to send HARQ feedback information on PCell or PUCCH SCell.

[0160] Optionally, if the subcarrier spacing of the cell transmitting PDSCH is equal to the first subcarrier spacing, then the reference time unit in the correspondence indicated by the first configuration information is the time unit on that cell, and this first reference time unit is the time unit where the end symbol of the PDSCH is located, referred to as the first time unit; the second reference time unit is the time unit that is K1 time units apart from the time unit where the end symbol of the PDSCH is located, referred to as the second time unit. The target cell is the cell corresponding to the second time unit in the correspondence. The target time unit is the time unit on the target cell that overlaps with the second time unit in the time domain.

[0161] Therefore, if the subcarrier spacing corresponding to the cell transmitting PDSCH is equal to the first subcarrier spacing, the schematic diagram of the feedback information transmission method is as follows: Figure 9As shown, the terminal device can determine a second time unit that is K1 time units away from the time unit where the end symbol of the PDSCH is located, and determine the target cell corresponding to the second time unit, i.e., SCell#2, according to the first configuration information. Then, it selects the time units on SCell#2 that have time domain overlap with the second time unit, such as... Figure 9 The time unit shown in bold on SCell#2 is used to determine the PUCCH resource according to the method described above in this time unit, in order to send the HARQ feedback information for the PDSCH.

[0162] It can be seen that, based on Figure 8 and Figure 9 The schematic diagram shown illustrates that the specific operational steps for determining the target cell and target time unit by the terminal device based on the first configuration information and the first reference time unit are not unique. For example, Figure 8 The first and second reference time units shown are described with the time domain length of the time unit corresponding to the first subcarrier interval as the granularity. Figure 9 The first time unit and the second time unit shown are described with the time domain length of the time unit in the cell where the PDSCH is located as the granularity, since the first subcarrier spacing is equal to the subcarrier spacing of the cell where the PDSCH is located. Therefore, this application does not limit the specific operation process of the terminal equipment or network equipment in determining the target cell and the target time unit.

[0163] In implementation method 1.2, the first subcarrier interval is the subcarrier interval with the smallest value among the subcarrier intervals corresponding to the multiple cells.

[0164] The time domain length of the reference time unit determined in this implementation is the largest time domain length among multiple cells. Compared with the time domain length of the subcarrier spacing used when limited to PCell or PUCCH SCell feedback, it is advantageous to select a time with better channel quality during a longer time domain duration to feed back the HARQ feedback information of PDSCH, thereby improving the transmission success rate of feedback information.

[0165] For example, Figure 10 As shown, multiple cells are configured to send HARQ feedback information, such as... Figure 8 or Figure 9 The subcarrier intervals shown are PCell, SCell#1, SCell#2, SCell#3, and SCell#4. In the DCI, the K1 indicator field is 00, and the K1 set used is {1, 2, 3, 4}. Among the subcarrier intervals corresponding to PCell, SCell#1, SCell#2, SCell#3, and SCell#4, the smallest subcarrier interval is the subcarrier interval corresponding to SCell#1 or SCell#2, which is 15kHz. Therefore, the first subcarrier interval is 15kHz. For example... Figure 10 As shown, the time domain length of the reference time unit is the same as the time domain length of a slot on SCell#1 or SCell#2. In the correspondence indicated by the first configuration information, the reference time units are time unit #1 and time unit #2, and the corresponding cells are SCell#3 and PCell, respectively. Figure 10 The PDSCH shown is the PDSCH on the PCell, and the value of K1 is 1. The first reference time unit determined by the terminal device is time unit #1, and the second reference time unit is time unit #2. The target cell is the PCell. The time unit on the PCell that overlaps with time unit #2 in the time domain is as follows: Figure 10 The two time units are shown in the thick frame on the PCell.

[0166] As described in the optional implementation above, if there are multiple time units in the target cell that overlap with the second reference time unit in the time domain, the terminal device and the network device may agree to use the time unit with the earliest time domain position as the target time unit, or the terminal device and the network device may agree to use the time unit with the latest time domain position as the target time unit. Figure 10 The schematic diagram shown assumes that the earliest time unit in the time domain is used as the target time unit. Therefore, the target time unit is... Figure 10 The time unit at the beginning of the time domain within the thick box on the PCell shown is the time unit where the PUCCH resource in the diagram is located.

[0167] In implementation method 1.3, the first subcarrier interval is the subcarrier interval with the largest value among the subcarrier intervals corresponding to the multiple cells.

[0168] The time domain length of the reference time unit determined in this implementation method is the smallest among the time domain lengths of the corresponding time units in multiple cells. Compared with the time domain length of the subcarrier spacing used when limited to PCell or PUCCH SCell feedback, it is beneficial to reduce feedback delay.

[0169] For example, Figure 11 As shown, multiple cells are configured to send HARQ feedback information, such as... Figure 8 or Figure 9 The diagram shows PCell, SCell#1, SCell#2, SCell#3, and SCell#4. Assume the K1 indicator field in the DCI is 00, and the K1 set used is {1, 2, 3, 4}. The subcarrier interval with the largest value among the subcarrier intervals corresponding to PCell, SCell#1, SCell#2, SCell#3, and SCell#4, i.e., the subcarrier interval in SCell#3 or SCell#4, is 60kHz. Therefore, the first subcarrier interval is 60kHz. For example... Figure 11As shown, the time domain length of the reference time unit is the same as the time domain length of a time slot on SCell#3 or SCell#4. In the correspondence indicated by the first configuration information, the reference time units are time units #1 to #8, corresponding to cells SCell#3, SCell#3, SCell#2, SCell#4, SCell#3, SCell#1, SCell#3, and PCell, respectively. Figure 11 As shown, assuming the PDSCH is the PDSCH on PCell and the value of K1 is 1, then the first reference time unit determined by the terminal device is time unit #2, the second reference time unit is time unit #3, the target cell is SCell #2, and the target time unit is as follows: Figure 11 The time unit is shown in the thick frame on SCell#2.

[0170] In another alternative implementation, the first subcarrier interval is predefined. This helps to save on the resource overhead and complexity required for configuration.

[0171] It is important to note that, such as Figure 7 , Figures 8 to 11 The correspondence indicated by the first configuration information shown is described for ease of understanding. The reference time unit can be the time unit on the cell corresponding to the first subcarrier interval. The first configuration information can be, but is not limited to, the information shown in Table 1 above. Figure 7 As shown, the terminal device obtains the aforementioned correspondence based on the first subcarrier interval and the first configuration information.

[0172] The aforementioned K1 is indicated by the downlink control information (DCI) for scheduling the PDSCH, and K1 is a value in the K1 set. Since the cell for HARQ feedback information transmission is no longer limited to PCell or PUCCH SCell, how the terminal device obtains the K1 set used in the feedback information transmission method is also a problem that needs to be solved. Possible implementation methods are described below.

[0173] In implementation method 2.1, the K1 set is the K1 set configured in the cell where the PDSCH is located. This is beneficial because the feedback time unit determined based on the K1 set takes into account the magnitude of the feedback delay required by the PDSCH of the cell and / or the uplink transmission capability of the terminal equipment.

[0174] In implementation method 2.2, the K1 set is the K1 set configured in the primary cell accessed by the terminal device. This is beneficial because the feedback time unit determined based on the K1 set takes into account the feedback delay required by the primary cell's PDSCH and / or the uplink transmission capability of the terminal device.

[0175] In implementation method 2.3, the K1 set is the K1 set configured among multiple cells that has the smallest subcarrier spacing. This is beneficial because the feedback time unit determined based on the K1 set can be combined with the feedback delay required for the PDSCH of the cell with the smallest subcarrier spacing.

[0176] In another optional implementation, when there are multiple cells with the smallest subcarrier spacing among multiple cells, the K1 set is the K1 set configured on the cell with the smallest or largest index among the cells with the smallest subcarrier spacing among multiple cells. This is beneficial for the network device and the terminal device to use an aligned K1 set when there are multiple cells with the smallest subcarrier spacing among multiple cells.

[0177] In implementation method 2.4, the K1 set is the K1 set configured for the cell with the largest subcarrier spacing among multiple cells. This is beneficial because the feedback time unit determined based on the K1 set can be combined with the feedback delay required for the PDSCH of the cell with the largest subcarrier spacing.

[0178] In another optional implementation, when there are multiple cells with the largest subcarrier spacing among multiple cells, the K1 set is the K1 set configured on the cell with the smallest or largest index among the cells with the largest subcarrier spacing among multiple cells. This is beneficial for the network device and the terminal device to adopt an aligned K1 set when there are multiple cells with the largest subcarrier spacing among multiple cells.

[0179] In implementation method 2.5, the K1 set is the K1 set associated with the first configuration information of the network device. This allows the network device to adjust the relationship between feedback latency and resource overhead in a timely manner based on system load and requirements through the K1 set associated with the first configuration information.

[0180] In implementation method 2.6, the K1 set is a predefined K1 set associated with the first configuration information. This helps to save on the resource overhead and complexity required for configuration.

[0181] In the above optional implementations 2.1 to 2.6, the K1 set is no longer limited to the K1 set configured on the PCell or PUCCH SCell, thereby further improving the flexibility of HARQ feedback information transmission.

[0182] Example 2. Feedback information transmission method 200.

[0183] When determining the time-frequency resources for transmitting HARQ feedback information, if these resources are unavailable—for example, if they conflict with time-domain resources occupied by other information to be transmitted, or overlap with downlink symbols or flexible symbols—this application proposes a feedback information transmission method. Specifically, when the first PUCCH resource used for transmitting HARQ feedback information overlaps with downlink symbols or flexible symbols in the time domain, how to transmit the HARQ feedback information of the PDSCH is a problem that needs to be solved. The feedback information transmission method 200 is described below with reference to the accompanying drawings.

[0184] Please see Figure 12 , Figure 12 This is a flowchart illustrating a feedback information transmission method 200 provided in an embodiment of this application.

[0185] like Figure 12 As shown, the feedback information transmission method 200 includes, but is not limited to, the following steps:

[0186] S201, the network device sends first configuration information, which is used to indicate the correspondence between M reference time units and multiple cells in the M reference time units configured to send Hybrid Automatic Repeat Request (HARQ) feedback information; accordingly, the terminal device receives the first configuration information.

[0187] S202. The network device sends a PDSCH, and the corresponding terminal device receives the PDSCH.

[0188] S203. The network device determines the second reference time unit among the M reference time units based on the first reference time unit, and determines the first time unit on the first cell based on the second reference time unit and the correspondence; correspondingly, the terminal device also determines the second reference time unit among the M reference time units based on the first reference time unit, and determines the first time unit on the first cell based on the second reference time unit and the correspondence.

[0189] The relevant descriptions of steps S201 to S203 can be found in the relevant content of the feedback information transmission method 100 described above, and will not be elaborated here. For example, the determination of the first cell and the first time unit in step S203 can be found in the relevant content of the target cell and the target time unit in the feedback information transmission method 100, and will not be elaborated here.

[0190] When the first PUCCH resource used to transmit the HARQ feedback information of the PDSCH overlaps with a downlink symbol or a flexible symbol in the time domain, steps S204 and S205 can be executed. The first PUCCH resource is a PUCCH resource of the first cell, located in the first time unit, configured to carry the HARQ feedback information of the PDSCH.

[0191] S204. The terminal device determines the second time unit, and correspondingly, the network device also determines the second time unit. The second time unit is located after the first time unit.

[0192] S205. The terminal device sends HARQ feedback information for the PDSCH using its second PUCCH resource within the second time unit. Correspondingly, the network device receives the HARQ feedback information for the PDSCH using its second PUCCH resource within the second time unit. The second PUCCH resource does not overlap with downlink symbols and flexible symbols in the time domain.

[0193] Optionally, the feedback information transmission method 200 may obtain the first subcarrier spacing using the methods described in Embodiments 1.1 to 1.3 of the feedback information transmission method 100 described above; and / or, the feedback information transmission method 200 may obtain the required K1 set using the methods described in Embodiments 2.1 to 2.6 of the feedback information transmission method 100 described above. Therefore, the feedback information transmission method 200 can further improve the flexibility and success rate of HARQ feedback information transmission.

[0194] Optionally, for the feedback information transmission method 200, the first subcarrier spacing can also be the subcarrier spacing corresponding to the default cell, and / or, the K1 set is the K1 set configured for the default cell. The default cell can be predefined or pre-configured; or, the default cell can be a PCell, a PUCCH SCell, or another specified cell.

[0195] As can be seen, when the first PUCCH resource overlaps with downlink symbols or flexible symbols in the time domain, the terminal device can switch the HARQ feedback information to other time units for transmission. This solves the problem of low data transmission reliability caused by the HARQ feedback information being discarded due to the overlap between the first PUCCH resource and downlink symbols or flexible symbols. Therefore, this feedback information transmission method 200 can improve the transmission success rate of HARQ feedback information. In an optional embodiment, the second time unit is a time unit on a second cell. The second cell is the first cell, or one of the multiple cells mentioned above other than the first cell. It can be seen that this feedback information transmission method 200, through switching in the time domain, or through switching between the time and frequency domains, transmits HARQ feedback information in a timely manner, avoiding the problem of HARQ feedback information being unable to be transmitted or being discarded due to the overlap between PUCCH resources and downlink symbols or flexible symbols, thus improving the transmission success rate of HARQ feedback information.

[0196] For example, such as Figure 13 The schematic diagram of the feedback information transmission method 200 shown assumes that the multiple cells configured to send HARQ feedback information are PCell, SCell#1, and SCell#N. It also assumes that the subcarrier intervals corresponding to PCell, SCell#1, and SCell#N are all equal, and that this subcarrier interval is the first subcarrier interval. The correspondence indicated by the first configuration information can be as follows: Figure 13 As shown, time units #1 to #5 correspond one-to-one with SCell#N, SCell#1, SCell#N, SCell#1, and PCell, respectively. Figure 13 As shown, the PDSCH is on the PCell, and the first reference time unit is the time unit where the end symbol of the PDSCH is located, i.e., time unit #1. Assuming that the K1 set used is the K1 set configured on the PCell, and the value of K1 determined based on this K1 set is 1, then the second reference time unit is time unit #2. Thus, the first cell is SCell #1, and the first time unit is the time unit shown in the thick box on SCell #1. If the first PUCCH resource determined by the terminal device within the first time unit shown in the thick box on SCell #1 overlaps with the downlink symbol or flexible symbol in the time domain, then the second time unit can be the time unit after the time unit shown in the thick box. And the second cell, such as... Figure 13 As shown, it could be the first cell, i.e., SCell#1, or PCell, or SCell#N, etc. Therefore, as... Figure 13As shown, the second time unit can be one of the second time units indicated by the thick box. The PUCCH resources determined in each of the second time units indicated by the thick box do not overlap with downlink symbols and flexible symbols in the time domain. Therefore, this implementation can switch the HARQ feedback information to other time units, or to other time units of other cells, when the first PUCCH resource overlaps with downlink symbols or flexible symbols, thereby improving the flexibility and success rate of HARQ feedback information transmission.

[0197] The following describes possible implementations of the second cell, the second time unit, and the second PUCCH resource, from implementation methods 3.1 to 3.3. The second PUCCH resource is the candidate PUCCH resource within the second time unit of the second cell. The determination of the candidate PUCCH resource can be found in the relevant content described above, and will not be detailed here.

[0198] Implementation method 3.1. The second cell is the cell corresponding to the third reference time unit in the one-to-one correspondence among the M reference time units. The second time unit is the time unit on the second cell that has temporal overlap with the third reference time unit. The second PUCCH resource is the candidate PUCCH resource within the second time unit.

[0199] The third reference time unit is the earliest available reference time unit in the time domain among at least one available reference time unit. Each available reference time unit is located after the second reference time unit in the at least one available reference time unit. The cell corresponding to each available reference time unit in the correspondence is an available candidate cell. The candidate PUCCH resources in the third time unit of the available candidate cell do not overlap with downlink symbols and flexible symbols. The third time unit is a time unit on the available candidate cell that overlaps with the reference time unit corresponding to the available candidate cell in the one-to-one correspondence.

[0200] In other words, the conditions that an available reference time unit must meet are: 1) it must be located after the second reference time unit; 2) the corresponding cell in this correspondence must be an available candidate cell; and 3) the candidate PUCCH resources in the third time unit of the available candidate cell must not overlap with downlink symbols and flexible symbols. This third time unit is the time unit on the available candidate cell where there is temporal overlap with the reference time unit corresponding to the available candidate cell. The determination of candidate PUCCH resources can be found in the relevant content described above, and will not be detailed here.

[0201] For example, Figure 14As shown, the first reference time unit is time unit #1, and the second reference time unit is time unit #2. Therefore, among the time units indicated by the first configuration information, those following time unit #2 are: time units #3 to #5. Specifically, the time unit that overlaps with time unit #3 on the available candidate cell SCell #N corresponding to time unit #3 is the time unit shown by the thick dashed box on SCell #N. Assuming that the candidate PUCCH resources within the time unit shown by the thick dashed box on SCell #N do not overlap with downlink symbols and flexible symbols, then time unit #3 is an available reference time unit. Similarly, the time unit that overlaps with time unit #4 on SCell #1 corresponding to time unit #4 is the time unit shown by the thick dashed box on SCell #1. Assuming that the candidate PUCCH resources within the time unit shown by the thick dashed box on SCell #1 do not overlap with downlink symbols and flexible symbols, then time unit #4 is also an available reference time unit. Similarly, the time unit that overlaps with time unit #5 in the PCell corresponding to time unit #5 is the time unit shown in the thick dashed box on the PCell; assuming that the candidate PUCCH resources within the time unit shown in the thick dashed box on this PCell do not overlap with downlink symbols and flexible symbols, then time unit #5 is also a usable reference time unit. The candidate PUCCH resources within these three usable reference time units are as follows: Figure 14 The gray filled block within the thick dashed frame shown.

[0202] The earliest available reference time unit in the time domain among the three available reference time units is time unit #3, that is, the third reference time unit is time unit #3. Then, the second cell is SCell #N corresponding to time unit 3#. The second time unit is the time unit on SCell #N that overlaps with time unit #3 in the time domain. The second PUCCH resource is the gray and diagonal fill block in this time unit.

[0203] It should be noted that, Figure 14 This explanation uses the example of multiple cells having the same subcarrier spacing. For cases with different subcarrier spacings, the time unit for sending HARQ feedback information is still the time unit in the cell corresponding to the third reference time unit in the one-to-one correspondence, which overlaps with the third reference time unit in the time domain. Optionally, assuming there are multiple time units in the cell that overlap with the third reference time unit in the time domain, then, as described in the optional implementation above, the time unit with the earliest time domain position can be used to send HARQ feedback information, i.e., as the feedback time unit. For details, please refer to Embodiment 1. Figure 9 , Figure 11 The method for determining the target time unit shown will not be elaborated here.

[0204] Optional, such as Figure 14 As shown, if the candidate PUCCH resource corresponding to time unit #3 overlaps with the downlink symbol or flexible symbol in the time domain, then time unit #3 is not a usable reference time unit. Accordingly, the usable reference time unit with the earliest available time position in the time domain is time unit #4, not time unit #3.

[0205] As can be seen, this implementation can determine at least one available reference time unit according to the correspondence indicated by the first configuration information, and then select the earliest available reference time unit in the time domain to obtain the second cell, the second time unit, and the second PUCCH resource to send HARQ feedback information. This avoids the problem of being unable to send HARQ feedback information when the first PUCCH resource overlaps with downlink symbols or flexible symbols, greatly improving the transmission success rate of HARQ feedback information.

[0206] Implementation 3.2. The second cell is the default cell, and the second time unit is the earliest available time unit in the time domain among at least one available time unit on the second cell. The candidate PUCCH resources on each available time unit in this at least one available time unit do not overlap with downlink symbols and flexible symbols.

[0207] The default cell can be predefined or pre-configured; or, the default cell can be PCell, PUCCHSCell, or another specified cell.

[0208] For example, such as Figure 15 As shown, assuming the default cell is PCell, the first reference time unit is time unit #1, the second reference time unit is time unit #2, the first cell is SCell #1 corresponding to time unit #2, and the first time unit is the time unit shown in the thick box on SCell #1. Assuming that the candidate PUCCH resources in the three time units following the first time unit on PCell do not overlap with downlink symbols and flexible symbols, then... Figure 15 The available time units are the three time units shown in the dashed ellipse on the PCell. Therefore, the second time unit is the earliest time unit in the time domain among these three available time units, such as... Figure 15 The second time unit on the PCell shown, the second PUCCH resource is as follows: Figure 15 The gray, twill-filled block in the second time cell on the PCell shown.

[0209] Optionally, when the terminal device's first PUCCH resource overlaps with a downlink symbol or flexible symbol in the first time unit of the first cell, it can, as follows: Figure 15The dashed arrows shown indicate that, based on the temporal order of time units following the first time unit on the default carrier, available time units are searched sequentially to obtain the second time unit and the second carrier, thereby obtaining the HARQ feedback information for the second PUCCH resource transmission. For example, Figure 15 In this scenario, assuming that the time unit shown in the last thick box on the PCell is the available time unit, the terminal device can sequentially determine whether the candidate PUCCH resources on the time unit overlap with the downlink symbol or flexible symbol according to the dashed arrows, in order to obtain the available time unit, and then obtain the second time unit and the second cell.

[0210] As can be seen, this implementation can determine the earliest available time unit in the time domain on the default carrier as the second time unit when the first PUCCH resource overlaps with the downlink symbol or flexible symbol and HARQ feedback information cannot be sent. HARQ feedback information is then sent on the candidate PUCCH resource in the second time unit. That is, by switching between the time domain and frequency domain, HARQ feedback information is transmitted in a timely manner, which greatly improves the transmission success rate of HARQ feedback information.

[0211] Implementation 3.3. The second cell is the first cell, and the second time unit is the earliest available time unit in the time domain among at least one available time unit on the second cell. The candidate PUCCH resources on each available time unit in at least one available time unit do not overlap with downlink symbols and flexible symbols.

[0212] As can be seen, in this embodiment, when the first PUCCH resource overlaps with the downlink symbol and the flexible symbol, the second time unit can be determined in the time unit after the first time unit on the first cell, so as to send HARQ feedback information in a timely manner.

[0213] The following description, in conjunction with the accompanying drawings, illustrates the available time units, candidate PUCCH resources, and second time units in this embodiment.

[0214] For example, Figure 16 As shown, the first reference time unit is time unit #1, the second reference time unit is time unit #2, the first carrier is SCell #1 corresponding to time unit #2, and the first time unit is the time unit shown in the thick box on SCell #1. Assuming that the candidate PUCCH resources for the three time units following the first time unit on SCell #1 do not overlap with downlink symbols and flexible symbols, then... Figure 16 The available time units can be the three time units within the dashed ellipse on SCell#1. Therefore, the second time unit is the earliest time unit in the time domain among these three available time units, as shown below. Figure 16 The second time unit on the PCell shown, the second PUCCH resource is as follows: Figure 16The gray-filled diagonal block in the second time cell on the PCell shown.

[0215] Optionally, when the first PUCCH resource overlaps with a downlink symbol or flexible symbol, the terminal device may, according to, Figure 16 The dashed arrows shown indicate that available time units are searched sequentially according to the temporal order of time units following the first time unit in the first cell, to obtain the second time unit and the second cell, and thus obtain the HARQ feedback information for the second PUCCH resource transmission. For example, Figure 16 In this scenario, assuming that the time unit shown in the last thick box on SCell#1 is the available time unit, the terminal device can sequentially determine whether the reference PUCCH resource on the time unit overlaps with the downlink symbol and the flexible symbol according to the dashed arrow, until the time unit shown in the last thick box is found, thus obtaining the available time unit and then the second time unit.

[0216] As can be seen, this implementation can continue to determine the earliest available time unit in the time domain as the second time unit in the first cell when the first PUCCH resource overlaps with the downlink symbol or flexible symbol, and send HARQ feedback information on the candidate PUCCH resource in the second time unit, which greatly improves the flexibility and success rate of HARQ feedback information transmission.

[0217] It should be understood that if the time-frequency resource for sending HARQ feedback information is unavailable when the terminal device determines it using a method different from that shown in method 100, and it is necessary to re-determine the time-frequency resource for sending HARQ feedback information, the time-frequency resource switching method shown in method 200 is also applicable. That is, this application does not limit the method for determining the first PUCCH resource in the feedback information transmission method 200.

[0218] For example, suppose the first PUCCH resource is determined based on the semi-static scheduling method in 2.1 or the dynamic scheduling method in 2.2 described above. That is, the cell where the PDSCH is located is configured to send the HARQ feedback information of the PDSCH on the PCell or PUCCH SCell. The time unit where the end symbol of the PDSCH is located is the fourth time unit, and the feedback time unit determined based on the fourth time unit and the K1 value corresponding to the K1 indicator field in the DCI in the K1 set is the fifth time unit. Then, if the first PUCCH resource for sending the HARQ feedback information overlaps with the time domain resources, downlink symbols or flexible symbols of other information in the time domain in the fifth time unit on the PCell or PUCCH SCell, then the feedback information transmission method 200 can be used to switch the HARQ feedback information to other cells and other time units for transmission. For example, the terminal device may use the fifth time unit for sending the HARQ feedback information as the first time unit in the feedback information transmission method 200 described above, and then execute the content described in embodiments 3.1 to 3.3 above to determine the time units that do not overlap, so as to send the HARQ feedback information.

[0219] Furthermore, the PDSCH described in Embodiments 1 and 2 of this application can be a semi-statically scheduled PDSCH or a dynamically scheduled PDSCH. If it is a dynamically scheduled PDSCH, then the DCI that schedules the PDSCH may not include an indication field used to directly indicate the carrier where the HARQ feedback information is located.

[0220] In other words, the HARQ feedback information transmitted on the target time unit of the target cell in Embodiment 1, or the HARQ feedback information transmitted on the second PUCCH resource on the second time unit of the second cell in Embodiment 2, is the HARQ feedback information of the semi-statically scheduled PDSCH, or the HARQ feedback information of the semi-statically scheduled PDSCH and the dynamically scheduled PDSCH.

[0221] In this embodiment, the first cell, the second cell, and the target cell can be different bandwidth parts (BWPs) within the same cell, which can be a PCell or an SCell. For example, the first cell is BWP1 on a PCell, and the second cell or the target cell is BWP2 on a PCell.

[0222] The first or second cell can be a portion of the frequency resources already allocated to a cell, such as different BWPs within the same cell or different subbands of the same BWP. Specifically, a BWP can be a portion of the frequency resources already allocated to a cell, while a subband occupies a portion of the frequency resources of a single BWP. The following combines... Figure 17illustrate.

[0223] Figure 17 This is a schematic diagram of the distribution of a type of BWP. For example... Figure 17 As shown, if a cell's BWP includes BWP1 to BWP4, and BWP1 includes sub-band 1 and sub-band 2, then the target cell can represent any one of BWP1 to BWP4. The first cell can include any one of BWP1 to BWP4. For the case where the second cell is other than the first cell, the second cell can be any one of BWP1 to BWP4 other than the first cell. Alternatively, the first cell can be any one of the sub-bands of BWP1, such as sub-band 1, and the second cell can be any other sub-band of BWP1 other than the first cell, such as sub-band 2.

[0224] Different cells, different BWPs within the same cell, or different sub-bands within the same BWP in the same cell can have different time slot format configurations. Figure 18 This is a schematic diagram illustrating a time slot format configuration for two cells. For example... Figure 18 The time domain resource configuration of the four time units in cell 0 (i.e., CC0) can be in the following order: downlink, downlink, uplink, uplink, and the time domain resource configuration of the four time units in cell 1 (i.e., CC1) can be in the following order: downlink, uplink, downlink, uplink.

[0225] In the embodiments of this application, a time unit can be a time slot, a sub-slot, or an OFDM symbol, etc.

[0226] In the above embodiments, the descriptions of each embodiment have different focuses. To avoid redundancy, for parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0227] To implement the functions of any of the feedback information transmission methods 100 to 200 provided in the embodiments of this application, the network device and the terminal device may respectively include hardware structures and software modules, and implement the above functions in the form of hardware structures, software modules, or hardware structures plus software modules. One of the above functions may be executed in the form of hardware structures, software modules, or hardware structures plus software modules. Figure 19 and Figure 20 The diagram illustrates the possible communication devices provided in the embodiments of this application. These communication devices can be used to implement the functions of the terminal devices or network devices in the above method embodiments, and thus can also achieve the beneficial effects of the above method embodiments.

[0228] Figure 19The communication device 1900 shown may include a communication unit 1901 and a processing unit 1902. The communication unit 1901 may include a transmitting unit and a receiving unit. The transmitting unit is used to implement the transmitting function, and the receiving unit is used to implement the receiving function. The communication unit 1901 can implement the transmitting function and / or the receiving function. The communication unit may also be described as a transceiver unit.

[0229] The communication device 1900 may be a terminal device, a device within a terminal device, or a device having the functions of a terminal device.

[0230] In one embodiment, the communication device 1900 can perform the relevant operations of the terminal device in Embodiment 1. The communication unit 1901 is configured to receive first configuration information, which indicates the correspondence between M reference time units and multiple cells configured to send Hybrid Automatic Repeat Request (HARQ) feedback information within the M reference time units; and is also configured to receive a Physical Downlink Shared Channel (PDSCH), the end symbol of which is located in the first reference time unit among the M reference time units; the processing unit 1902 is configured to determine a second reference time unit among the M reference time units based on the first reference time unit, wherein the second reference time unit is after the first reference time unit, and the second reference time unit is spaced K1 reference time units from the first reference time unit, where K1 is an integer greater than or equal to zero. The communication unit 1901 is further configured to determine a target time unit on the target cell based on the second reference time unit and the correspondence, wherein the target cell is the cell corresponding to the second reference time unit in the correspondence, and the target time unit is a time unit on the target cell that overlaps with the second reference time unit in the time domain; the communication unit 1901 is further configured to send HARQ feedback information of PDSCH on the target time unit of the target cell; wherein the M reference time units have the same time domain length, and the time domain length of the reference time unit is determined based on the first subcarrier interval, which is either the subcarrier interval with the largest value among the subcarrier intervals corresponding to multiple cells, or the subcarrier interval with the smallest value among the subcarrier intervals corresponding to multiple cells. A more detailed description of the above processing unit 1902 and communication unit 1901 can be obtained by referring to the relevant description in the method embodiment of Embodiment 1.

[0231] In another embodiment, the communication device 1900 can perform the relevant operations of the terminal device in Embodiment 2. The communication unit 1901 is configured to receive first configuration information, which indicates the correspondence between M reference time units and multiple cells configured to send Hybrid Automatic Repeat Request (HARQ) feedback information within the M reference time units, where M is a positive integer; and is also configured to receive a Physical Downlink Shared Channel (PDSCH), the end symbol of which is located in the first reference time unit among the M reference time units. The processing unit 1902 is configured to determine a second reference time unit among the M reference time units based on the first reference time unit, wherein the second reference time unit is after the first reference time unit, and the second reference time unit is spaced K1 reference time units from the first reference time unit, where K1 is an integer greater than or equal to zero; and is also configured to determine a second reference time unit based on the second reference time unit. The first time unit on the first cell is determined by referring to the time unit and the corresponding relationship, wherein the first cell is the cell corresponding to the second reference time unit in the corresponding relationship, and the first time unit is a time unit on the first cell that overlaps with the second reference time unit in the time domain; and when the first physical uplink control channel (PUCCH) resource overlaps with downlink symbols or flexible symbols in the time domain, a second time unit is determined, the second time unit is located after the first time unit, and the first PUCCH resource is the PUCCH resource of the first cell located within the first time unit; the communication unit 1901 is also used to send HARQ feedback information of PDSCH using the second PUCCH resource in the second time unit, and the second PUCCH resource does not overlap with downlink symbols and flexible symbols in the time domain. A more detailed description of the above processing unit 1902 and communication unit 1901 can be obtained by referring to the relevant description in the method embodiment of Embodiment 2.

[0232] The communication device 1900 can be a network device, a device within a network device, or a device with network device functions.

[0233] In one embodiment, the communication device 1900 can perform the relevant operations of the network device in Embodiment 1 described above. The communication unit 1901 is configured to send first configuration information, which indicates the correspondence between M reference time units and multiple cells configured to send Hybrid Automatic Repeat Request (HARQ) feedback information within the M reference time units; and is also configured to send a Physical Downlink Shared Channel (PDSCH), the end symbol of which is located in the first reference time unit among the M reference time units. The processing unit 1902 is configured to determine a second reference time unit among the M reference time units based on the first reference time unit, wherein the second reference time unit is after the first reference time unit, and the second reference time unit is spaced K1 reference time units from the first reference time unit, where K1 is an integer greater than or equal to zero. The communication unit 1901 is further configured to receive HARQ feedback information of the PDSCH on the target cell based on the second reference time unit and the correspondence, wherein the target cell is the cell corresponding to the second reference time unit in the correspondence, and the target time unit is a time unit on the target cell that overlaps with the second reference time unit in the time domain; the communication unit 1901 is also configured to receive HARQ feedback information of the PDSCH on the target time unit of the target cell; wherein the M reference time units have the same time domain length, and the time domain length of the reference time unit is determined based on the first subcarrier interval, the first subcarrier interval being: the subcarrier interval with the largest value among the subcarrier intervals corresponding to multiple cells, or the subcarrier interval with the smallest value among the subcarrier intervals corresponding to multiple cells. For details of this implementation, please refer to the relevant content of the above method embodiments. In addition, the communication device 1900 can also perform related operations in other embodiments.

[0234] In another embodiment, the communication device 1900 can perform the relevant operations of the network device in Embodiment 2 described above. The communication unit 1901 is configured to send first configuration information, which indicates the correspondence between M reference time units and multiple cells configured to send Hybrid Automatic Repeat Request (HARQ) feedback information within the M reference time units, where M is a positive integer; and is also configured to send a Physical Downlink Shared Channel (PDSCH), the end symbol of which is located in the first reference time unit among the M reference time units. The processing unit 1902 is configured to determine a second reference time unit among the M reference time units based on the first reference time unit, wherein the second reference time unit is after the first reference time unit and the second reference time unit is spaced K1 reference time units apart from the first reference time unit, where K1 is an integer greater than or equal to zero; and is also configured to determine, based on the second reference time unit and the correspondence, a second reference time unit is determined. The communication unit 1901 is further configured to: define a first time unit on a first cell, wherein the first cell is the cell corresponding to the second reference time unit in the correspondence, and the first time unit is a time unit on the first cell that overlaps with the second reference time unit in the time domain; and determine a second time unit when the first physical uplink control channel (PUCCH) resource overlaps with downlink symbols or flexible symbols in the time domain, wherein the second time unit is located after the first time unit, and the first PUCCH resource is a PUCCH resource of the first cell located within the first time unit, configured to carry HARQ feedback information of the PDSCH; the communication unit 1901 is further configured to receive HARQ feedback information of the PDSCH using the second PUCCH resource within the second time unit, wherein the second PUCCH resource does not overlap with downlink symbols and flexible symbols in the time domain. For details of this implementation, please refer to the relevant content of the above method embodiments. Additionally, the communication device 1900 can also perform related operations in other embodiments.

[0235] Figure 20 The communication device 2000 shown may include a processor 2001 and an interface circuit 2002. The processor 2001 and the interface circuit 2002 are coupled to each other. It is understood that the interface circuit 2002 may be an interface circuit or an input / output interface. Optionally, the communication device 2000 may also include a memory 2003 for storing instructions executed by the processor 2001, or storing input data required by the processor 2001 to execute instructions, or storing data generated after the processor 2001 executes instructions.

[0236] The communication device 2000 is a terminal device or a network device: the interface circuit 2002 is used to perform... Figure 6 In S101, S102, and S104, processor 2001 executes S103; or, interface circuit 2002 is used for Figure 12S201, S202, and S205 are executed by processor 2001. Figure 12 S203 and S204.

[0237] When the aforementioned communication device is a chip applied to a terminal device, the terminal device chip implements the functions of the terminal device in the above method embodiments. The terminal device chip receives information from other modules (such as an RF module or antenna) in the terminal device, the information being sent to the terminal device by the network device; or, the terminal device chip sends information to other modules (such as an RF module or antenna) in the terminal device, the information being sent to the network device by the terminal device.

[0238] When the aforementioned communication device is a module applied to a network device, the network device module implements the functions of the network device in the above method embodiments. The network device module receives information from other modules (such as radio frequency modules or antennas) within the network device; this information is sent from the terminal device to the network device. Alternatively, the network device module sends information to other modules (such as radio frequency modules or antennas) within the network device; this information is sent from the network device to the terminal device. The network device module here can be the baseband chip of the network device, or a DU (Digital Unit) or other modules. The DU here can be a DU under an Open Radio Access Network (O-RAN) architecture.

[0239] It is understood that the processor in the embodiments of this application may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. A general-purpose processor may be a microprocessor or any conventional processor.

[0240] The method steps in the embodiments of this application can be implemented in hardware or by a processor executing software instructions. The software instructions can consist of corresponding software modules, which can be stored in random access memory, flash memory, read-only memory, programmable read-only memory, erasable programmable read-only memory, electrically erasable programmable read-only memory, registers, hard disks, portable hard disks, CD-ROMs, or any other form of storage medium known in the art. An exemplary storage medium is coupled to a processor, enabling the processor to read information from and write information to the storage medium. Of course, the storage medium can also be a component of the processor. The processor and storage medium can reside in an ASIC. Additionally, the ASIC can reside in a network device or terminal device. Alternatively, the processor and storage medium can exist as discrete components in the network device or terminal device.

[0241] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of this application are performed entirely or partially. The computer can be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user equipment, or other programmable device. The computer program or instructions can be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program or instructions can be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; it can also be an optical medium, such as a digital video optical disc; or it can be a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or non-volatile storage medium, or may include both types of storage media.

[0242] In the various embodiments of this application, unless otherwise specified or in case of logical conflict, the terminology and / or descriptions of different embodiments are consistent and can be referenced by each other. The technical features of different embodiments can be combined to form new embodiments according to their inherent logical relationship.

Claims

1. A method for transmitting feedback information, executed by a terminal device or a module within a terminal device, characterized in that, The method includes: Receive first configuration information, which is used to indicate a one-to-one correspondence between M reference time units and multiple cells in the M reference time units configured to send Hybrid Automatic Repeat Request (HARQ) feedback information, where M is a positive integer; Receive the Physical Downlink Shared Channel (PDSCH), wherein the end symbol of the PDSCH is located in the first reference time unit among the M reference time units; Based on the first reference time unit, a second reference time unit is determined among the M reference time units, wherein the second reference time unit is after the first reference time unit, and the second reference time unit is separated from the first reference time unit by a reference time unit of K1, where K1 is an integer greater than or equal to zero; Based on the second reference time unit and the one-to-one correspondence, a target time unit on the target cell is determined, wherein the target cell is the cell corresponding to the second reference time unit in the one-to-one correspondence, and the target time unit is a time unit on the target cell that has time domain overlap with the second reference time unit; The HARQ feedback information of the PDSCH is sent on the target time unit of the target cell; Wherein, the M reference time units have the same time domain length, and the time domain length of the reference time unit is determined according to the first subcarrier interval, which is: The subcarrier interval with the largest value among the subcarrier intervals corresponding to the multiple cells, or the subcarrier interval with the smallest value among the subcarrier intervals corresponding to the multiple cells.

2. The method according to claim 1, characterized in that, The target time unit is the earliest time unit in the target cell that overlaps with the second reference time unit in the time domain.

3. The method according to claim 1 or 2, characterized in that, K1 is the downlink control information (DCI) indication that schedules the PDSCH, and K1 is a value in the K1 set.

4. The method according to claim 3, characterized in that, The K1 set satisfies at least one of the following: The K1 set is the K1 set configured in the cell where the PDSCH is located; The K1 set is the K1 set configured in the primary cell accessed by the terminal device; The K1 set is the K1 set configured for the cell with the smallest subcarrier interval among the plurality of cells; The K1 set is the K1 set configured for the cell with the largest subcarrier interval among the multiple cells.

5. A method for transmitting feedback information, executed by a terminal device or a module within a terminal device, characterized in that, The method includes: Receive first configuration information, which is used to indicate a one-to-one correspondence between M reference time units and multiple cells in the M reference time units configured to send Hybrid Automatic Repeat Request (HARQ) feedback information, where M is a positive integer; Receive the Physical Downlink Shared Channel (PDSCH), wherein the end symbol of the PDSCH is located in the first reference time unit among the M reference time units; The second reference time unit is determined from the M reference time units based on the first reference time unit, wherein the second reference time unit is after the first reference time unit, and the second reference time unit is separated from the first reference time unit by K1 reference time units, where K1 is an integer greater than or equal to zero; Based on the second reference time unit and the one-to-one correspondence, a first time unit on the first cell is determined, wherein the first cell is the cell corresponding to the second reference time unit in the one-to-one correspondence, and the first time unit is a time unit on the first cell that overlaps with the second reference time unit in the time domain. When the first physical uplink control channel (PUCCH) resource overlaps with downlink symbols or flexible symbols in the time domain, a second time unit is determined. The second time unit is located after the first time unit. The first PUCCH resource is the PUCCH resource of the first cell, located within the first time unit, and configured to carry HARQ feedback information of the PDSCH. The second PUCCH resource within the second time unit transmits the HARQ feedback information of the PDSCH, and the second PUCCH resource does not overlap with downlink symbols and flexible symbols in the time domain.

6. The method according to claim 5, characterized in that, The second time unit is the time unit on the second cell; The second cell is the cell corresponding to the third reference time unit among the M reference time units in the one-to-one correspondence. The second time unit is a time unit on the second cell that overlaps with the third reference time unit in the time domain. The third reference time unit is the earliest available reference time unit in the time domain among at least one available reference time unit. Each available reference time unit is located after the second reference time unit. The cell corresponding to each available reference time unit in the one-to-one correspondence is an available candidate cell. The candidate PUCCH resources in the third time unit of the available candidate cell do not overlap with downlink symbols and flexible symbols. The third time unit is a time unit on the available candidate cell that overlaps with the reference time unit corresponding to the available candidate cell in the one-to-one correspondence in the time domain. or, The second cell is either the primary cell PCell or the first cell, and the second time unit is the earliest available time unit in the time domain among at least one available time unit on the second cell. The candidate PUCCH resources on each available time unit in the at least one available time unit do not overlap with downlink symbols and flexible symbols. The candidate PUCCH resource configuration is used to carry the HARQ feedback information.

7. The method according to claim 5 or 6, characterized in that, The M reference time units have the same time domain length, and the time domain length of the reference time unit is determined according to the first subcarrier interval, which is: The subcarrier interval with the largest value among the subcarrier intervals corresponding to the multiple cells, or the subcarrier interval with the smallest value among the subcarrier intervals corresponding to the multiple cells.

8. The method according to claim 5 or 6, characterized in that, K1 is the downlink control information (DCI) indication that schedules the PDSCH, and K1 is a value in the K1 set.

9. The method according to claim 8, characterized in that, The K1 set is the K1 set configured on the cell where the PDSCH is located; The K1 set is the K1 set configured on the carrier of the primary cell accessed by the terminal device in the plurality of cells; The K1 set is the K1 set configured on the carrier with the smallest subcarrier spacing among the multiple cells; The K1 set is the K1 set configured on the carrier with the largest subcarrier interval value among the multiple cells.

10. A method for transmitting feedback information, executed by a network device or a module within a network device, characterized in that, The method includes: Send first configuration information, which is used to indicate the one-to-one correspondence between M reference time units and multiple cells in the M reference time units configured to send Hybrid Automatic Repeat Request (HARQ) feedback information, where M is a positive integer; Transmit the Physical Downlink Shared Channel (PDSCH), wherein the end symbol of the PDSCH is located in the first reference time unit among the M reference time units; Based on the first reference time unit, a second reference time unit is determined among the M reference time units, wherein the second reference time unit is after the first reference time unit, and the second reference time unit is separated from the first reference time unit by a reference time unit of K1, where K1 is an integer greater than or equal to zero; Based on the second reference time unit and the one-to-one correspondence, a target time unit on the target cell is determined, wherein the target cell is the cell corresponding to the second reference time unit in the one-to-one correspondence, and the target time unit is a time unit on the target cell that has time domain overlap with the second reference time unit; HARQ feedback information of the PDSCH is received on the target time unit of the target cell; Wherein, the M reference time units have the same time domain length, and the time domain length of the reference time unit is determined according to the first subcarrier interval, which is: The subcarrier interval with the largest value among the subcarrier intervals corresponding to the multiple cells, or the subcarrier interval with the smallest value among the subcarrier intervals corresponding to the multiple cells.

11. The method according to claim 10, characterized in that, The target time unit is the earliest time unit in the target cell that overlaps with the second reference time unit in the time domain.

12. The method according to claim 10 or 11, characterized in that, K1 is the downlink control information (DCI) indication that schedules the PDSCH, and K1 is a value in the K1 set.

13. The method according to claim 12, characterized in that, The K1 set satisfies at least one of the following: The K1 set is the K1 set configured in the cell where the PDSCH is located; The K1 set is the K1 set configured in the primary cell accessed by the terminal device; The K1 set is the K1 set configured for the cell with the smallest subcarrier interval among the plurality of cells; The K1 set is the K1 set configured for the cell with the largest subcarrier interval among the multiple cells.

14. A method for transmitting feedback information, executed by a network device or a module within a network device, characterized in that, The method includes: Send first configuration information, which is used to indicate the one-to-one correspondence between M reference time units and multiple cells in the M reference time units configured to send Hybrid Automatic Repeat Request (HARQ) feedback information, where M is a positive integer; Transmit the Physical Downlink Shared Channel (PDSCH), wherein the end symbol of the PDSCH is located in the first reference time unit among the M reference time units; The second reference time unit is determined from the M reference time units based on the first reference time unit, wherein the second reference time unit is after the first reference time unit, and the second reference time unit is separated from the first reference time unit by K1 reference time units, where K1 is an integer greater than or equal to zero; Based on the second reference time unit and the one-to-one correspondence, a first time unit on the first cell is determined, wherein the first cell is the cell corresponding to the second reference time unit in the one-to-one correspondence, and the first time unit is a time unit on the first cell that overlaps with the second reference time unit in the time domain. When the first physical uplink control channel (PUCCH) resource overlaps with downlink symbols or flexible symbols in the time domain, a second time unit is determined. The second time unit is located after the first time unit. The first PUCCH resource is the PUCCH resource of the first cell, located within the first time unit, and configured to carry HARQ feedback information of the PDSCH. The second PUCCH resource within the second time unit receives the HARQ feedback information of the PDSCH, and the second PUCCH resource does not overlap with downlink symbols and flexible symbols in the time domain.

15. The method according to claim 14, characterized in that, The second time unit is the time unit on the second cell; The second cell is the cell corresponding to the third reference time unit among the M reference time units in the one-to-one correspondence. The second time unit is a time unit on the second cell that overlaps with the third reference time unit in the time domain. The third reference time unit is the earliest available reference time unit in the time domain among at least one available reference time unit. Each available reference time unit is located after the second reference time unit. The cell corresponding to each available reference time unit in the one-to-one correspondence is an available candidate cell. The candidate PUCCH resources in the third time unit of the available candidate cell do not overlap with downlink symbols and flexible symbols. The third time unit is a time unit on the available candidate cell that overlaps with the reference time unit corresponding to the available candidate cell in the one-to-one correspondence. or, The second cell is either the primary cell PCell or the first cell. The second time unit is the earliest available time unit in the time domain among at least one available time unit on the second cell. The candidate PUCCH resources on each available time unit do not overlap with downlink symbols and flexible symbols. The candidate PUCCH resources are configured to carry the HARQ feedback information.

16. The method according to claim 14 or 15, characterized in that, The M reference time units have the same time domain length, and the time domain length of the reference time unit is determined according to the first subcarrier interval, which is: The subcarrier interval with the largest value among the subcarrier intervals corresponding to the multiple cells, or the subcarrier interval with the smallest value among the subcarrier intervals corresponding to the multiple cells.

17. The method according to claim 14 or 15, characterized in that, K1 is the downlink control information (DCI) indication that schedules the PDSCH, and K1 is a value in the K1 set.

18. The method according to claim 17, characterized in that, The K1 set is the K1 set configured on the cell where the PDSCH is located; The K1 set is the K1 set configured on the carrier of the primary cell accessed by the terminal equipment in the plurality of cells; The K1 set is the K1 set configured on the carrier with the smallest subcarrier spacing among the multiple cells; The K1 set is the K1 set configured on the carrier with the largest subcarrier interval value among the multiple cells.

19. A communication apparatus comprising a module for performing the method of any one of claims 1 to 4, or a module for performing the method of any one of claims 5 to 9, or a module for performing the method of any one of claims 10 to 13, or a module for performing the method of any one of claims 14 to 18.

20. A communication device, characterized in that, The device includes a processor and an interface circuit. The interface circuit is used to receive signals from other communication devices besides the communication device and transmit them to the processor, or to send signals from the processor to other communication devices besides the communication device. The processor is used to implement the method as described in any one of claims 1 to 4, or to implement the method as described in any one of claims 5 to 9, or to implement the method as described in any one of claims 10 to 13, or to implement the method as described in any one of claims 14 to 18, through logic circuits or executing code instructions.

21. A computer-readable storage medium, characterized in that, The storage medium stores a computer program or instructions that, when executed by a communication device, implement the method as described in any one of claims 1 to 4, or the method as described in any one of claims 5 to 9, or the method as described in any one of claims 10 to 13, or the method as described in any one of claims 14 to 18.

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