Hybrid automatic repeat request feedback transmission method, terminal, base station and communication system

Abstract

The invention provides a hybrid automatic repeat request feedback transmission method, a terminal, a base station and a communication system, and relates to the field of wireless communication. Determining a first carrier for transmitting the HARQ feedback according to a predefined carrier search rule, or determining a first carrier indicated by the configured carrier pattern for transmitting the HARQ feedback; determining the number K1 of time units which differ from a time unit when the PDSCH or the PDCCH ends to a first time unit when the HARQ feedback starts to be transmitted on a default second carrier; and starting to send or receive the HARQ feedback at a time unit, corresponding to the time domain position of the first time unit, of the first carrier. In the scene of multiple uplink carriers, the HARQ feedback transmission scheme for determining the carrier for transmitting the PUCCH and determining the time domain position for transmitting the PUCCH on the carrier through the predefined carrier search rule or the configured carrier pattern is complete and feasible.

Description

[0001] This application is a divisional application of the invention patent application with application number: 202110366864.5, application date: April 6, 2021, and invention name: Hybrid automatic repeat request feedback transmission method, terminal, base station and communication system. Technical Field

[0002] The present disclosure relates to the field of wireless communications, and in particular to a hybrid automatic repeat request feedback transmission method, a terminal, a base station and a communication system. Background Art

[0003] For the Physical Downlink Shared Channel (PDSCH) of Semi-Persistent Scheduling (SPS), if there is a PDSCH to Hybrid Automatic Repeat Request (HARQ) feedback timing indicator in its activation downlink control information (DCI), the time domain position of its HARQ feedback is determined by the offset indicated by the PDSCH to HARQ feedback timing indicator carried in its activation DCI. If the PDSCH transmission ends in time slot or sub-time slot n, the corresponding HARQ feedback starts to be transmitted in time slot or sub-time slot n+K1, K1 is the offset indicated by the PDSCH to HARQ feedback timing indicator. If the PDSCH to HARQ feedback timing indicator in the DCI does not exist, K1 is configured by the Radio Resource Control (RRC) signaling. HARQ feedback is usually transmitted through the Physical Uplink Control Channel (PUCCH). HARQ feedback is also called HARQ-ACK feedback, including a positive acknowledgement (ACK) or a negative acknowledgement (NACK) to the PDSCH.

[0004] At present, the fifth generation mobile communication technology (5th Generation mobile networks, 5th Generation wireless systems or 5th-Generation, 5G) New Radio (New Radio, NR) has introduced a shorter SPS cycle (minimum 1 time slot) for ultra-reliable and low latency communication (Ultra-reliable and Low Latency Communication, URLLC). In this case, if the time domain position of HARQ-ACK feedback is determined according to the offset indicated by the feedback timing indicator from PDSCH to HARQ carried in the DCI that activates SPS or the offset configured by RRC signaling, the HARQ feedback of SPS PDSCH will often conflict with symbols that cannot be used for uplink, so that the transmission of the HARQ feedback is discarded, resulting in unnecessary PDSCH retransmission.

[0005] For the PDSCH dynamically scheduled by DCI at the end of time slot or sub-time slot n, or the physical downlink control channel (PDCCH) used for SPS PDSCH release at the end of time slot or sub-time slot n, the PUCCH carrying its HARQ feedback starts to be sent at time slot or sub-time slot n+K1, where K1 is the offset indicated by the PDSCH to HARQ feedback timing indicator in the DCI.

[0006] If multiple carriers are configured in the uplink, such as in the scenario of time division duplex (TDD) carrier aggregation with different uplink and downlink configurations, or in the scenario of TDD and frequency division duplex (FDD) carrier aggregation, such as Figure 1 As shown, when HARQ feedback collides with a symbol that cannot be used for uplink in a time slot or sub-time slot of a carrier, there may be resources for PUCCH transmission at the corresponding time domain position of another carrier, so the carrier for transmitting PUCCH can be switched. Summary of the invention

[0007] The disclosed embodiment provides a method for determining the carrier for transmitting PUCCH and the time domain position of PUCCH on the carrier in the scenario of multiple uplink carriers, so that the HARQ feedback transmission scheme for determining the carrier for transmitting PUCCH and the time domain position of PUCCH on the carrier through predefined carrier search rules or configured carrier patterns is complete and feasible. This avoids the conflict between HARQ feedback and symbols that cannot be used for uplink in the TDD system to a certain extent, and further avoids the waste of resources caused by PDSCH or PDCCH retransmission caused by HARQ feedback being discarded to a certain extent, and reduces the delay required for successful transmission of PDSCH or PDCCH.

[0008] Some embodiments of the present disclosure propose a hybrid automatic repeat request feedback transmission method, including: determining the first carrier for transmitting HARQ feedback according to a predefined carrier search rule, or determining the first carrier for transmitting HARQ feedback indicated by a configured carrier pattern, wherein the HARQ feedback is feedback to PDSCH or PDCCH; determining the number of time units K1 between the time unit at which the PDSCH or PDCCH ends and the first time unit at which the HARQ feedback starts to be transmitted on a default second carrier; and starting to send or receive the HARQ feedback in the time unit corresponding to the time domain position of the first carrier and the first time unit.

[0009] In some embodiments, determining a first carrier for transmitting HARQ feedback according to a predefined carrier search rule includes:

[0010] When the PUCCH resource for transmitting the HARQ feedback on the default second carrier collides with a symbol that cannot be used for uplink:

[0011] According to the search order of the carriers from large to small subcarrier spacing, a carrier having available PUCCH resources in a time unit corresponding to the time domain position of the first time unit on other carriers except the second carrier is used as the first carrier;

[0012] and / or,

[0013] When the subcarrier spacing is the same, in the ascending search order of the carrier numbers, the carrier having available PUCCH resources in the time unit corresponding to the time domain position of the first time unit on other carriers except the second carrier is used as the first carrier.

[0014] In some embodiments, the time unit corresponding to the time domain position of the first time unit on other carriers except the second carrier is: the first time unit whose start symbol on the other carrier is not earlier than the start symbol of the first time unit on the second carrier.

[0015] In some embodiments, the configured carrier pattern includes a period of carrier configuration, a carrier configuration unit, and carrier indication information for each carrier configuration unit included in the period of carrier configuration.

[0016] In some embodiments, determining the first carrier for transmitting HARQ feedback indicated by the configured carrier pattern includes: determining a carrier configuration unit corresponding to the time domain position of the first time unit; and determining the carrier indicated by the carrier indication information corresponding to the carrier configuration unit as the first carrier for transmitting HARQ feedback.

[0017] In some embodiments, determining the first carrier for transmitting HARQ feedback indicated by a configured carrier pattern includes: determining a carrier configuration unit corresponding to the time domain position of the first time unit; determining a temporary first carrier indicated by carrier indication information corresponding to the carrier configuration unit; if a time unit corresponding to the time domain position of the first time unit cannot be found in the carrier configuration unit in the temporary first carrier, determining the carrier indicated by the carrier indication information corresponding to the next carrier configuration unit as the first carrier for transmitting HARQ feedback; otherwise, determining the temporary first carrier as the first carrier for transmitting HARQ feedback.

[0018] In some embodiments, if the subcarrier spacing of the carrier where the PDSCH or PDCCH is located is greater than or equal to the subcarrier spacing of the second carrier, the first time unit corresponding to K1=0 is the time unit overlapping with the PDSCH or PDCCH on the second carrier; if the subcarrier spacing of the carrier where the PDSCH or PDCCH is located is less than the subcarrier spacing of the second carrier, the first time unit corresponding to K1=0 is the time unit at which the PDSCH or PDCCH ends on the second carrier.

[0019] In some embodiments, the second carrier is one of:

[0020] The carrier with the maximum subcarrier spacing among the carriers that can be used to transmit HARQ feedback;

[0021] The carrier configured by RRC signaling;

[0022] Pcell carrier;

[0023] PScell ​​carrier;

[0024] PUCCH-Scell ​​carrier.

[0025] In some embodiments, the method, when executed by a base station, includes:

[0026] Determine a first carrier for transmitting HARQ feedback according to a predefined carrier search rule, or configure a carrier pattern of a first carrier for indicating transmission of HARQ feedback through RRC signaling, wherein the HARQ feedback is feedback for PDSCH or PDCCH;

[0027] Determine and indicate to the terminal the number of time units K1 between the time unit at which the PDSCH or PDCCH ends and the first time unit at which the HARQ feedback starts to be transmitted on the default second carrier;

[0028] The HARQ feedback is received starting from a time unit corresponding to the time domain position of the first carrier and the first time unit.

[0029] In some embodiments, the method, when executed by a terminal, includes:

[0030] Determine a first carrier for transmitting HARQ feedback according to a predefined carrier search rule, or receive RRC signaling and determine a first carrier for transmitting HARQ feedback indicated by a carrier pattern configured by the RRC signaling, wherein the HARQ feedback is feedback on a PDSCH or a PDCCH;

[0031] The number of time units K1 between the time unit at which the PDSCH or PDCCH ends and the first time unit at which the HARQ feedback starts to be transmitted on the default second carrier is different from the time unit indicated by the receiving base station, and the first time unit is determined based on K1;

[0032] The HARQ feedback is sent starting from a time unit corresponding to the time domain position of the first carrier and the first time unit.

[0033] Some embodiments of the present disclosure provide a terminal, including:

[0034] Memory; and

[0035] A processor coupled to the memory, the processor is configured to execute a hybrid automatic repeat request feedback transmission method based on instructions stored in the memory, wherein the step of sending or receiving the HARQ feedback executes an operation of sending HARQ feedback.

[0036] Some embodiments of the present disclosure provide a base station, including:

[0037] Memory; and

[0038] A processor coupled to the memory, the processor is configured to execute a hybrid automatic repeat request feedback transmission method based on instructions stored in the memory, wherein the step of sending or receiving the HARQ feedback executes an operation of receiving the HARQ feedback.

[0039] Some embodiments of the present disclosure propose a communication system, including: the aforementioned terminal and the aforementioned base station.

[0040] Some embodiments of the present disclosure provide a non-transitory computer-readable storage medium having a computer program stored thereon, which implements the steps of a hybrid automatic repeat request feedback transmission method when executed by a processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. The present disclosure can be more clearly understood according to the following detailed description with reference to the drawings.

[0042] Obviously, the drawings described below are only some embodiments of the present disclosure, and a person skilled in the art can obtain other drawings based on these drawings without creative work.

[0043] Figure 1 A schematic diagram showing switching of carriers for transmitting a PUCCH.

[0044] Figure 2 A flowchart of a HARQ feedback transmission method according to some embodiments of the present disclosure is shown.

[0045] Figure 3 A schematic diagram showing a HARQ feedback transmission method 1 according to some embodiments of the present disclosure.

[0046] Figure 4 A schematic diagram showing a second HARQ feedback transmission method according to some embodiments of the present disclosure.

[0047] Figure 5 A schematic diagram showing a terminal according to some embodiments of the present disclosure.

[0048] Figure 6 A schematic diagram of a base station according to some embodiments of the present disclosure is shown.

[0049] Figure 7 A schematic diagram showing a communication system according to some embodiments of the present disclosure. DETAILED DESCRIPTION

[0050] The technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure.

[0051] Unless otherwise specified, the descriptions such as "first" and "second" in the present disclosure are used to distinguish different objects and are not used to indicate the meaning of size or time sequence. Unless otherwise specified, " / " in the present disclosure means "or".

[0052] 5G NR supports flexible time division duplex (TDD) frame structure configuration. The symbols of each time slot can be configured into three categories: downlink symbols, uplink symbols, and flexible symbols. Downlink symbols can only be used for downlink transmission, and uplink symbols can only be used for uplink transmission. Whether the flexible symbol is used for uplink transmission or downlink transmission depends on whether the base station schedules downlink transmission or uplink transmission on the flexible symbol. The symbol type configuration method adopts a combination of semi-static radio resource control (RRC) configuration and dynamic downlink control information (DCI) configuration. RRC configuration supports cell-specific uplink and downlink configuration, as well as terminal (UE)-specific uplink and downlink configuration, and configures the uplink and downlink directions of symbols with symbols as the minimum granularity. UE-specific uplink and downlink configuration is used to configure symbols that are not configured in the cell-specific uplink and downlink configuration. Symbols that are not configured in the semi-static RRC configuration can be considered as flexible symbols configured in the semi-static configuration. DCI configuration supports the use of Slot Format Indicator (SFI) carried by DCI format 2_0 or directly determining the direction of symbols through DCI scheduling of uplink and downlink data. The symbol type indicated by SFI is one of the three types mentioned above. Semi-statically configured flexible symbols can determine the symbol direction by SFI or DCI scheduling of uplink and downlink data.

[0053] The disclosed embodiment provides a method for determining the carrier for transmitting PUCCH and the time domain position of PUCCH on the carrier in the scenario of multiple uplink carriers, so that the HARQ feedback transmission scheme for determining the carrier for transmitting PUCCH and the time domain position of PUCCH on the carrier through predefined carrier search rules or configured carrier patterns is complete and feasible. Thereby, to a certain extent, the conflict between HARQ feedback and symbols that cannot be used for uplink in the TDD system is avoided, and to a certain extent, the waste of resources caused by the retransmission of PDSCH or Physical Downlink Control Channel (PDCCH) caused by the discard of HARQ feedback is avoided, and the delay required for the successful transmission of PDSCH or PDCCH is reduced. For the HARQ feedback of dynamically scheduled PDSCH, for example, when the time domain position of the second carrier that can be used for PUCCH transmission is earlier than the time domain position of the first carrier that can be used for PUCCH transmission, PUCCH is switched to the second carrier for transmission, so that a smaller time offset K1 from PDSCH to HARQ feedback can be indicated, thereby reducing the delay of HARQ feedback. For HARQ feedback of SPS PDSCH, for example, when the time domain position of HARQ feedback determined by the PDSCH to HARQ feedback timing indicator carried in the DCI activating SPS on the first carrier cannot be used for uplink transmission, switching PUCCH to the second carrier for transmission can avoid resource waste caused by HARQ feedback being discarded.

[0054] Figure 2 A schematic diagram showing a flow chart of a hybrid automatic repeat request feedback transmission method according to some embodiments of the present disclosure.

[0055] like Figure 2 As shown, the hybrid automatic repeat request feedback transmission method 100 of this embodiment includes: steps 110-130, which can be executed by a base station or a terminal, and are applicable to the HARQ feedback transmission scenario of uplink multiple carriers.

[0056] In step 110, a first carrier for transmitting HARQ feedback is determined according to a predefined carrier search rule, or a first carrier for transmitting HARQ feedback indicated by a configured carrier pattern is determined, wherein the HARQ feedback is feedback for PDSCH or PDCCH.

[0057] Since the HARQ feedback is usually transmitted through the PUCCH, the carrier used to transmit the HARQ feedback is also the carrier for transmitting the PUCCH, which is referred to as the PUCCH carrier.

[0058] In step 120, the number of time units K1 between the time unit at which the PDSCH or PDCCH ends and the first time unit at which the HARQ feedback starts to be transmitted on the default second carrier is determined.

[0059] If the HARQ feedback is feedback for PDSCH, the number of time units K1 between the time unit at which the PDSCH ends and the first time unit is determined; if the HARQ feedback is feedback for PDCCH, the number of time units K1 between the time unit at which the PDCCH ends and the first time unit is determined. For the PDCCH used to indicate SPS release, the HARQ feedback is feedback for the PDCCH.

[0060] K1 represents the time unit offset from the time unit where the PDSCH or PDCCH ends to the first time unit, referred to as the time unit offset or offset.

[0061] Optionally, K1, for example, only counts the available time units for HARQ feedback. The available time units for HARQ feedback do not include symbols that cannot be used for uplink transmission. Symbols that cannot be used for uplink transmission include, for example, downlink symbols semi-statically configured by RRC signaling, symbols where the synchronization broadcast block (Synchronization Signal Physical Broadcast Channel Block, SS PBCH Block or SSB) is located, and symbols where the PDCCH control resource set 0 (Control Resource Set #0, CORESET #0) is located. Symbols that can be used for uplink transmission include, for example, uplink symbols semi-statically configured. Symbols that can be used for uplink transmission also include, for example, uplink symbols semi-statically configured and flexible symbols semi-statically configured.

[0062] If the subcarrier spacing of the carrier where the PDSCH or PDCCH is located is greater than or equal to the subcarrier spacing of the second carrier, the first time unit corresponding to K1=0 is a time unit that overlaps with the PDSCH or PDCCH in time on the second carrier.

[0063] If the subcarrier spacing of the carrier where the PDSCH or PDCCH is located is smaller than the subcarrier spacing of the second carrier, the first time unit corresponding to K1=0 is the time unit where the PDSCH or PDCCH ends on the second carrier.

[0064] The time unit is, for example, a time slot or a sub-time slot.

[0065] The subcarrier spacing referenced by the time unit of the phase difference is the subcarrier spacing of the default second carrier, and the default second carrier is, for example, a carrier with the largest subcarrier spacing among carriers that can be used to transmit HARQ feedback; or a carrier configured by RRC signaling; or a primary cell (Pcell) carrier, or a primary secondary cell (Primary Secondary CellGroup Cell, Primary SCG Cell, PScell) carrier, or a PUCCH secondary cell (PUCCH Secondary Cell, PUCCH-Scell) carrier. A carrier that can be used to transmit HARQ feedback is, for example, a carrier in a PUCCH carrier group.

[0066] In step 130, the HARQ feedback starts to be sent or received in a time unit corresponding to the first carrier and the first time unit time domain position.

[0067] When the method 100 is executed by the terminal, the operation of sending the HARQ feedback in step 130 is executed; when the method 100 is executed by the base station, the operation of receiving the HARQ feedback in step 130 is executed.

[0068] When the method 100 is executed by a base station, it specifically includes steps 110a-130a.

[0069] In step 110a, the base station determines the first carrier for transmitting HARQ feedback according to a predefined carrier search rule, or configures a carrier pattern for indicating the first carrier for transmitting HARQ feedback to the terminal through RRC signaling, wherein the HARQ feedback is feedback for PDSCH or PDCCH.

[0070] In step 120a, the base station determines and indicates to the terminal the number of time units K1 between the time unit at which the PDSCH or PDCCH ends and the first time unit at which the HARQ feedback starts to be transmitted on the default second carrier.

[0071] In step 130a, the base station starts to receive the HARQ feedback in a time unit corresponding to the first carrier and the first time unit time domain position.

[0072] When the method 100 is executed by a terminal, it includes steps 110b-130b.

[0073] In step 110b, the terminal determines the first carrier for transmitting HARQ feedback according to a predefined carrier search rule, or receives RRC signaling and determines the first carrier for transmitting HARQ feedback indicated by a carrier pattern configured by RRC signaling, wherein the HARQ feedback is feedback on PDSCH or PDCCH.

[0074] In step 120b, the terminal receives the number of time units K1 between the time unit indicating the end of the PDSCH or PDCCH and the first time unit for starting to transmit the HARQ feedback on the default second carrier, and determines the first time unit based on K1.

[0075] In step 130b, the terminal starts sending the HARQ feedback in a time unit corresponding to the first carrier and the first time unit time domain position.

[0076] When the method 100 is executed by the terminal and the base station in cooperation, the execution order of the steps is: 110a, 110b, 120a, 120b, 130b, 130a.

[0077] The method 100 may be to determine a carrier from among carriers included in a PUCCH carrier group for transmitting the PUCCH, or to determine a carrier from among carriers included in each of a plurality of PUCCH carrier groups for transmitting the PUCCH, so that a plurality of PUCCHs may be transmitted simultaneously.

[0078] The method 100 can be implemented, for example, by method 1, method 2, etc., but is not limited to the listed methods.

[0079] Method 1

[0080] A complete and feasible HARQ feedback transmission scheme is provided for determining a carrier for transmitting the PUCCH and a time domain position for transmitting the PUCCH on the carrier through a predefined carrier search rule.

[0081] If there is a PDSCH or PDCCH to HARQ feedback timing indicator in the DCI, the time domain position of the HARQ feedback is determined by the time slot / sub-time slot offset K1 indicated by the PDSCH or PDCCH to HARQ feedback timing indicator. If the feedback timing indicator does not exist, the PDSCH or PDCCH to HARQ time slot / sub-time slot offset K1 is configured by RRC signaling dl-DataToUL-ACK or dl-DataToUL-ACK-DCI-1-2, and the time domain position of the HARQ feedback is determined by K1. The reference subcarrier spacing is the subcarrier spacing of the default second PUCCH carrier.

[0082] If the subcarrier spacing of the carrier where the PDSCH or PDCCH is located is greater than or equal to the subcarrier spacing of the default second carrier, K1=0 corresponds to the time slot / subslot on the default second carrier that overlaps with the PDSCH or PDCCH in time. If the subcarrier spacing of the carrier where the PDSCH or PDCCH is located is less than the subcarrier spacing of the default second carrier, K1=0 corresponds to the time slot / subslot on the default second carrier where the PDSCH or PDCCH ends.

[0083] The default second carrier is, for example, a carrier with the largest subcarrier spacing among carriers that can be used to transmit HARQ feedback; a carrier configured by RRC signaling; a Pcell carrier; a PScell ​​carrier; or a PUCCH-Scell ​​carrier.

[0084] If the PUCCH resource of the default second PUCCH carrier at the time domain position of the HARQ feedback conflicts with a symbol that cannot be used for uplink, then find available PUCCH resources at the time domain position corresponding to the time domain position of the HARQ feedback on other carriers to start transmitting the HARQ feedback. The available PUCCH resources do not conflict with the symbol that cannot be used for uplink.

[0085] Among the carriers that can be used to transmit HARQ feedback, searching for other carriers for transmitting HARQ feedback can be performed in the order of increasing carrier numbers from large to small subcarrier spacings, and when the subcarrier spacings are the same. Prioritizing the search for available PUCCH resources on subcarriers with small subcarrier spacings can reduce the latency of HARQ feedback. The carrier that can be used to transmit HARQ feedback is, for example, a carrier in a PUCCH group.

[0086] The time domain position corresponding to the time domain position of the HARQ feedback on other carriers is: the first time slot / sub-time slot whose start symbol of the time slot / sub-time slot on other carriers is not earlier than the start symbol of the time slot / sub-time slot determined according to K1 on the default second carrier.

[0087] For example, in the attached Figure 3 In the figure, the default second carrier is a carrier with a subcarrier spacing of 30KHz. For the PDSCH that ends transmission in the time slot numbered 1 on the 30KHz carrier, the indicated K1 is 4, but the symbols contained in the time slot numbered 5 are semi-statically configured downlink symbols, so it is necessary to find other carriers to transmit PUCCH. Since there are 4 carriers with different subcarrier spacings, the first priority is to find a carrier with a subcarrier spacing of 120KHz. If the time slot numbered 20 on the 120KHz carrier cannot be used for PUCCH transmission, the second priority is to find a carrier with a subcarrier spacing of 60KHz. If the time slot numbered 10 on the 60KHz carrier cannot be used for PUCCH transmission, the last step is to find out whether the time slot numbered 3 on the carrier with a subcarrier spacing of 15KHz can transmit PUCCH.

[0088] Method 2

[0089] A complete and feasible HARQ feedback transmission scheme is provided by determining the carrier for transmitting the PUCCH and the time domain position for transmitting the PUCCH on the carrier through the configured carrier pattern.

[0090] The carrier pattern configured by RRC signaling includes a period of carrier configuration for transmitting PUCCH, a carrier configuration unit, and carrier indication information for each carrier configuration unit included in the period of carrier configuration. That is, for each carrier configuration unit within the period of carrier configuration, RRC signaling indicates the carrier for transmitting PUCCH. The carrier configuration unit may include one or more time slots; or, the carrier configuration unit may include one or more sub-time slots.

[0091] If there is a PDSCH or PDCCH to HARQ feedback timing indicator in the DCI, the time domain position of the HARQ feedback is determined by the time slot / sub-time slot offset K1 indicated by the PDSCH or PDCCH to HARQ feedback timing indicator. If the feedback timing indicator does not exist, the PDSCH or PDCCH to HARQ time slot / sub-time slot offset K1 is configured by RRC signaling dl-DataToUL-ACK or dl-DataToUL-ACK-DCI-1-2, and the time domain position of the HARQ feedback is determined by K1. The reference subcarrier spacing of K1 is the subcarrier spacing of the default second PUCCH carrier.

[0092] If the subcarrier spacing of the carrier where the PDSCH or PDCCH is located is greater than or equal to the subcarrier spacing of the default second carrier, K1=0 corresponds to the time slot / subslot on the default second carrier that overlaps with the PDSCH or PDCCH in time. If the subcarrier spacing of the carrier where the PDSCH or PDCCH is located is less than the subcarrier spacing of the default second carrier, K1=0 corresponds to the time slot / subslot on the default second carrier where the PDSCH or PDCCH ends.

[0093] The default second carrier is, for example, a carrier with the largest subcarrier spacing among carriers that can be used to transmit HARQ feedback; a carrier configured by RRC signaling; a Pcell carrier; a PScell ​​carrier; or a PUCCH-Scell ​​carrier.

[0094] The carrier for transmitting the PUCCH is the carrier indicated by the RRC signaling corresponding to the carrier configuration unit corresponding to the time domain position of the HARQ feedback. The carrier configuration unit corresponding to the time domain position of the HARQ feedback refers to the carrier configuration unit that overlaps with the time domain position of the HARQ feedback in time.

[0095] Optionally, when the subcarrier spacing of the first carrier transmitting PUCCH and the default second carrier is different, the starting symbol of the time slot / sub-time slot transmitting PUCCH on the first carrier shall not be earlier than the first time slot / sub-time slot of the starting symbol of the time slot / sub-time slot determined according to K1 on the second carrier.

[0096] It is assumed that the time slot / sub-time slot at which the HARQ feedback starts to be transmitted on the default second carrier is the first time unit.

[0097] In some embodiments, a carrier configuration unit corresponding to the time domain position of the first time unit is determined, and a carrier indicated by the carrier indication information corresponding to the carrier configuration unit is determined as a first carrier for transmitting HARQ feedback. The carrier configuration unit corresponding to the time domain position of the first time unit refers to a carrier configuration unit that overlaps with the first time unit in time.

[0098] In some other embodiments, a carrier configuration unit corresponding to the time domain position of the first time unit is determined; a temporary first carrier indicated by the carrier indication information corresponding to the carrier configuration unit is determined; if the time unit corresponding to the time domain position of the first time unit cannot be found in the carrier configuration unit in the temporary first carrier, the carrier indicated by the carrier indication information corresponding to the next carrier configuration unit is determined as the first carrier for transmitting HARQ feedback; otherwise, the temporary first carrier is determined as the first carrier for transmitting HARQ feedback.

[0099] The time unit corresponding to the time domain position of the first time unit on other carriers except the second carrier is: the first time unit whose start symbol of the time unit on the other carrier is not earlier than the start symbol of the first time unit on the second carrier.

[0100] For example, in Figure 4In the cycle shown, there are 4 carrier configuration units. For the first carrier configuration unit, RRC signaling indicates that the carrier for transmitting PUCCH is a carrier with a subcarrier spacing of 30KHz; for the second carrier configuration unit, RRC signaling indicates that the carrier for transmitting PUCCH is a carrier with a subcarrier spacing of 15KHz; for the third carrier configuration unit, RRC signaling indicates that the carrier for transmitting PUCCH is a carrier with a subcarrier spacing of 60KHz; for the fourth carrier configuration unit, RRC signaling indicates that the carrier for transmitting PUCCH is a carrier with a subcarrier spacing of 120KHz. For the PDSCH ending in the time slot with the subcarrier number 1 of 30KHz, the indicated K1 is 4, and the carrier configuration unit where the time domain position of the corresponding HARQ feedback is located is the second carrier configuration unit. According to the indication relationship between the aforementioned carrier configuration unit and the carrier, the subcarrier for transmitting PUCCH is a carrier with a subcarrier spacing of 15KHz. In one method, PUCCH is transmitted in the time slot numbered 2 on the carrier with a subcarrier spacing of 15KHz. In another way, since in the second carrier configuration unit, the time slot for transmitting PUCCH cannot be found on the carrier with a subcarrier spacing of 15KHz, the starting symbol of the time slot for transmitting PUCCH is not earlier than the starting symbol of the time slot numbered 5 with a subcarrier spacing of 30KHz, and thus the carrier for transmitting PUCCH is the carrier with a subcarrier spacing of 60KHz corresponding to the third carrier configuration unit, and PUCCH is transmitted in the time slot numbered 12 on the carrier with a subcarrier spacing of 60KHz.

[0101] Figure 5 A schematic diagram showing a terminal according to some embodiments of the present disclosure.

[0102] like Figure 5 As shown, the terminal 500 of this embodiment includes: a memory 510; and a processor 520 coupled to the memory 510, and the processor 520 is configured to execute a transmission method for hybrid automatic repeat request feedback based on instructions stored in the memory 510, wherein the operation of sending HARQ feedback is performed in the step of sending or receiving HARQ feedback.

[0103] For example, the terminal determines the first carrier for transmitting HARQ feedback according to a predefined carrier search rule, or receives RRC signaling and determines the first carrier for transmitting HARQ feedback indicated by the carrier pattern configured by the RRC signaling, and the HARQ feedback is feedback on the PDSCH or PDCCH; receives the number of time units K1 between the time unit where the PDSCH or PDCCH ends indicated by the base station and the first time unit where the HARQ feedback starts to be transmitted on the default second carrier, determines the first time unit based on K1; and starts sending the HARQ feedback in the time unit corresponding to the time domain position of the first carrier and the first time unit.

[0104] Figure 6 A schematic diagram of a base station according to some embodiments of the present disclosure is shown.

[0105] like Figure 6 As shown, the base station 600 of this embodiment includes: a memory 610; and a processor 620 coupled to the memory 610, and the processor 620 is configured to execute a transmission method for hybrid automatic repeat request feedback based on instructions stored in the memory 610, wherein the operation of receiving HARQ feedback is performed in the step of sending or receiving HARQ feedback.

[0106] For example, the base station determines the first carrier for transmitting HARQ feedback according to a predefined carrier search rule, or configures a carrier pattern of the first carrier for transmitting HARQ feedback through RRC signaling, where the HARQ feedback is feedback on PDSCH or PDCCH; determines and indicates to the terminal the number of time units K1 between the time unit at which the PDSCH or PDCCH ends and the first time unit at which the HARQ feedback starts to be transmitted on the default second carrier; and starts receiving the HARQ feedback in the time unit corresponding to the time domain position of the first carrier and the first time unit.

[0107] The memory 510, 610 may include, for example, a system memory, a fixed non-volatile storage medium, etc. The system memory may store, for example, an operating system, an application program, a boot loader, and other programs.

[0108] The terminal 500 or the base station 600 may also include an input / output interface, a network interface, a storage interface, etc. These interfaces and the memory and the processor may be connected, for example, via a bus. Among them, the input / output interface provides a connection interface for input / output devices such as a display, a mouse, a keyboard, and a touch screen. The network interface provides a connection interface for various networked devices. The storage interface provides a connection interface for external storage devices such as an SD card and a USB flash drive.

[0109] Figure 7 A schematic diagram showing a communication system according to some embodiments of the present disclosure.

[0110] like Figure 7 As shown, the communication system 700 of this embodiment includes: a terminal 500 and a base station 600. One base station 600 can serve multiple terminals 500.

[0111] Some embodiments of the present disclosure provide a non-transitory computer-readable storage medium having a computer program stored thereon, which implements the steps of a hybrid automatic repeat request feedback transmission method when the program is executed by a processor.

[0112] Those skilled in the art will appreciate that the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present disclosure may take the form of a computer program product implemented on one or more non-transient computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer program code.

[0113] The present disclosure is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0114] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0115] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0116] The above description is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A hybrid automatic repeat request feedback transmission method, characterized in that: include: Determine a first carrier for transmitting HARQ feedback according to a predefined carrier search rule, or determine a first carrier for transmitting HARQ feedback indicated by a configured carrier pattern, wherein the HARQ feedback is feedback for a PDSCH or a PDCCH; Determine the number of time units K1 between the time unit at which the PDSCH or PDCCH ends and the first time unit at which the HARQ feedback starts to be transmitted on a default second carrier, where the second carrier is a Pcell carrier; If the first carrier is a carrier other than the second carrier, the HARQ feedback is sent or received starting from a time unit corresponding to a time domain position of the first carrier and the first time unit.

2. The method according to claim 1, characterized in that Determining a first carrier for transmitting HARQ feedback according to a predefined carrier search rule includes: When the PUCCH resource for transmitting the HARQ feedback on the default second carrier collides with a symbol that cannot be used for uplink: According to the search order of the carriers from large to small subcarrier spacing, a carrier having available PUCCH resources in a time unit corresponding to the time domain position of the first time unit on other carriers except the second carrier is used as the first carrier; and / or, When the subcarrier spacing is the same, in the ascending search order of the carrier numbers, the carrier having available PUCCH resources in the time unit corresponding to the time domain position of the first time unit on other carriers except the second carrier is used as the first carrier.

3. The method according to claim 1 or 2, characterized in that: The time unit corresponding to the time domain position of the first time unit on other carriers except the second carrier is: the first time unit whose start symbol of the time unit on the other carrier is not earlier than the start symbol of the first time unit on the second carrier.

4. The method according to claim 1, characterized in that: The configured carrier pattern includes a carrier configuration period, a carrier configuration unit, and carrier indication information for each carrier configuration unit included in the carrier configuration period.

5. The method according to claim 4, characterized in that Determining a first carrier for transmitting HARQ feedback indicated by a configured carrier pattern includes: Determine a carrier configuration unit corresponding to the time domain position of the first time unit; The carrier indicated by the carrier indication information corresponding to the carrier configuration unit is determined as the first carrier for transmitting HARQ feedback.

6. The method according to claim 4, characterized in that Determining a first carrier for transmitting HARQ feedback indicated by a configured carrier pattern includes: Determine a carrier configuration unit corresponding to the time domain position of the first time unit; Determine a temporary first carrier indicated by the carrier indication information corresponding to the carrier configuration unit; If a time unit corresponding to the time domain position of the first time unit cannot be found in the carrier configuration unit in the temporary first carrier, the carrier indicated by the carrier indication information corresponding to the next carrier configuration unit is determined as the first carrier for transmitting HARQ feedback; otherwise, the temporary first carrier is determined as the first carrier for transmitting HARQ feedback.

7. The method according to claim 1, characterized in that If the subcarrier spacing of the carrier where the PDSCH or PDCCH is located is greater than or equal to the subcarrier spacing of the second carrier, the first time unit corresponding to K1=0 is a time unit overlapping with the PDSCH or PDCCH on the second carrier; If the subcarrier spacing of the carrier where the PDSCH or PDCCH is located is smaller than the subcarrier spacing of the second carrier, the first time unit corresponding to K1=0 is the time unit where the PDSCH or PDCCH ends on the second carrier.

8. The method according to claim 1, characterized in that When the method is executed by a base station, it includes: Determine a first carrier for transmitting HARQ feedback according to a predefined carrier search rule, or configure a carrier pattern of a first carrier for indicating transmission of HARQ feedback through RRC signaling, wherein the HARQ feedback is feedback for PDSCH or PDCCH; Determine and indicate to the terminal the number of time units K1 between the time unit at which the PDSCH or PDCCH ends and the first time unit at which the HARQ feedback starts to be transmitted on the default second carrier; The HARQ feedback is received starting from a time unit corresponding to the time domain position of the first carrier and the first time unit.

9. The method according to claim 1, characterized in that: When the method is executed by a terminal, it includes: Determine a first carrier for transmitting HARQ feedback according to a predefined carrier search rule, or receive RRC signaling and determine a first carrier for transmitting HARQ feedback indicated by a carrier pattern configured by the RRC signaling, wherein the HARQ feedback is feedback for PDSCH or PDCCH; The number of time units K1 between the time unit at which the PDSCH or PDCCH ends and the first time unit at which the HARQ feedback starts to be transmitted on the default second carrier is different from the time unit indicated by the receiving base station, and the first time unit is determined based on K1; The HARQ feedback is sent starting from a time unit corresponding to the time domain position of the first carrier and the first time unit.

10. A terminal, comprising: Memory; as well as A processor coupled to the memory, the processor being configured to execute the hybrid automatic repeat request feedback transmission method according to any one of claims 1-7 and 9 based on instructions stored in the memory, wherein the operation of sending HARQ feedback is performed in the step of sending or receiving the HARQ feedback.

11. A base station, comprising: Memory; as well as A processor coupled to the memory, the processor being configured to execute the hybrid automatic repeat request feedback transmission method according to any one of claims 1 to 8 based on instructions stored in the memory, wherein the operation of receiving HARQ feedback is performed in the step of sending or receiving the HARQ feedback.

12. A communication system comprising: The terminal as claimed in claim 10 and the base station as claimed in claim 11.

13. A non-transitory computer-readable storage medium having a computer program stored thereon, wherein when the program is executed by a processor, the steps of the hybrid automatic repeat request feedback transmission method according to any one of claims 1 to 9 are implemented.

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