WO2024082355A1 - Procédé et appareil de détermination de livre de codes harq-ack de type 1 - Google Patents

Procédé et appareil de détermination de livre de codes harq-ack de type 1 Download PDF

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Publication number
WO2024082355A1
WO2024082355A1 PCT/CN2022/130429 CN2022130429W WO2024082355A1 WO 2024082355 A1 WO2024082355 A1 WO 2024082355A1 CN 2022130429 W CN2022130429 W CN 2022130429W WO 2024082355 A1 WO2024082355 A1 WO 2024082355A1
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Prior art keywords
harq
cell
ack
cells
ack information
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PCT/CN2022/130429
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English (en)
Inventor
Haipeng Lei
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Lenovo (Beijing) Limited
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Priority to PCT/CN2022/130429 priority Critical patent/WO2024082355A1/fr
Publication of WO2024082355A1 publication Critical patent/WO2024082355A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1861—Physical mapping arrangements
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0053—Allocation of signaling, i.e. of overhead other than pilot signals
    • H04L5/0055—Physical resource allocation for ACK/NACK

Definitions

  • Embodiments of the present disclosure generally relate to wireless communication technology, and more particularly to more particularly to type-1 (semi-static) hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook determination.
  • type-1 semi-static
  • HARQ-ACK hybrid automatic repeat request acknowledgement
  • Wireless communication systems are widely deployed to provide various telecommunication services, such as telephony, video, data, messaging, broadcasts, and so on.
  • Wireless communication systems may employ multiple access technologies capable of supporting communication with multiple users by sharing available system resources (e.g., time, frequency, and power) .
  • Examples of wireless communication systems may include fourth generation (4G) systems, such as long-term evolution (LTE) systems, LTE-advanced (LTE-A) systems, or LTE-A Pro systems, and fifth generation (5G) systems, which may also be referred to as new radio (NR) systems.
  • 4G systems such as long-term evolution (LTE) systems, LTE-advanced (LTE-A) systems, or LTE-A Pro systems
  • 5G systems which may also be referred to as new radio (NR) systems.
  • a user equipment may monitor a physical downlink control channel (PDCCH) in one or more search spaces.
  • the PDCCH may carry downlink control information (DCI) , which may schedule uplink channels, such as a physical uplink shared channel (PUSCH) , or downlink channels, such as a physical downlink shared channel (PDSCH) .
  • DCI downlink control information
  • the UE may transmit HARQ-ACK feedback (e.g., HARQ-ACK information bit (s) ) for the PDSCH through a PUSCH or a physical uplink control channel (PUCCH) .
  • the PUCCH may carry a HARQ-ACK codebook including the HARQ-ACK information bit (s) for the PDSCH.
  • the UE may include a transceiver, and a processor coupled to the transceiver.
  • the processor may be configured to: receive a first downlink control information (DCI) format scheduling a first set of physical downlink shared channels (PDSCHs) on a first set of cells of the UE; generate a hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook comprising HARQ-ACK feedback associated with candidate PDSCH reception occasions on the first set of cells and HARQ-ACK feedback for the first set of PDSCHs; and transmit the HARQ-ACK codebook.
  • DCI downlink control information
  • PDSCHs physical downlink shared channels
  • HARQ-ACK hybrid automatic repeat request acknowledgement
  • generating the HARQ-ACK codebook may include generating HARQ-ACK information bits for each cell of the first set of cells and concatenating the generated HARQ-ACK information bits for each cell of the first set of cells in order of associated serving cell index.
  • generating HARQ-ACK information bits for each cell of the first set of cells may include: generating HARQ-ACK information bits for candidate PDSCH reception occasions of the corresponding cell; and generating a HARQ-ACK information bit (s) for a first PDSCH of the first set of PDSCHs received on the corresponding cell and located outside of the candidate PDSCH reception occasions of the corresponding cell.
  • the HARQ-ACK information bits for the candidate PDSCH reception occasions of the corresponding cell and the HARQ-ACK information bit (s) for the first PDSCH are ordered according to PDSCH reception occasions on the corresponding cell.
  • generating HARQ-ACK information bits for each cell of the first set of cells may include: generating HARQ-ACK information bits for candidate PDSCH reception occasions of the corresponding cell; and generating a HARQ-ACK information bit (s) for a first PDSCH which can be potentially scheduled on the corresponding cell by the first DCI format.
  • the HARQ-ACK information bit (s) for the first PDSCH is placed after or before the HARQ-ACK information bits for the candidate PDSCH reception occasions of the corresponding cell.
  • the HARQ-ACK information bits for the candidate PDSCH reception occasions of the corresponding cell are arranged according to PDSCH reception occasions on the corresponding cell.
  • the HARQ-ACK information bit (s) for the first PDSCH is ACK or negative ACK (NACK) dependent on the decoding result of the first PDSCH.
  • the HARQ-ACK information bit (s) for the first PDSCH is NACK.
  • the HARQ-ACK codebook may include a first part and a second part, and generating the HARQ-ACK codebook may include: generating the first part including HARQ-ACK information bits for candidate PDSCH reception occasions of each cell of the first set of cells and generating the second part including HARQ-ACK information bits for all cells which can be potentially scheduled by the first DCI format with one PDSCH on each cell.
  • a HARQ-ACK information bit (s) in the second part for the cell is negative ACK (NACK) .
  • NACK negative ACK
  • HARQ-ACK information bit (s) in the second part for a cell of the first set of cells scheduled by the first DCI format is ACK or NACK.
  • the HARQ-ACK information bit (s) for the second PDSCH in the first part for the cell is ACK or negative ACK (NACK) depending on a decoding result of the second PDSCH, or NACK.
  • the HARQ-ACK codebook may include a first part and a second part, and generating the HARQ-ACK codebook may include: generating the first part including HARQ-ACK information bits for candidate PDSCH reception occasions of each cell of the first set of cells and generating the second part including a HARQ-ACK information bit (s) for one or more PDSCHs among the first set of PDSCHs received on one or more cell (s) of the first set of cells and located out of candidate PDSCH reception occasions of the one or more cell (s) of the first set of cells.
  • the HARQ-ACK information bits in the first part for candidate PDSCH reception occasions of each cell of the first set of cells are arranged according to associated candidate PDSCH reception occasions.
  • the HARQ-ACK information bit (s) in the second part is arranged according to associated cell indexes.
  • the HARQ-ACK information bit (s) in the second part is arranged firstly according to associated PDSCH starting timing and then according to associated cell indexes.
  • generating the HARQ-ACK codebook may include, for each cell of the first set of cells: generating a first part including HARQ-ACK information bits for candidate PDSCH reception occasions of the corresponding cell; in the case that a first PDSCH of the first set of PDSCHs is received on the corresponding cell and located outside of the candidate PDSCH reception occasions of the corresponding cell, generating a second part including a HARQ-ACK information bit (s) for the first PDSCH; and concatenating the first part and the second part to generate HARQ-ACK feedback for the corresponding cell.
  • the HARQ-ACK information bits for each cell of the first set of cells are arranged according to associated serving cell indices.
  • the processor is further configured to receive a second DCI format scheduling a second set of PDSCHs on a second set of cells of the UE, wherein HARQ-ACK feedback for the second set of PDSCHs is to be multiplexed in the HARQ-ACK codebook.
  • each of the first and second sets of cells is a subset of a respective set of cells configured for multi-cell scheduling, or is a subset of the same set of cells configured for multi-cell scheduling.
  • generating the HARQ-ACK codebook may include generating HARQ-ACK feedback for each cell of the first and second sets of cells, which may include: generating HARQ-ACK information bits for candidate PDSCH reception occasions of a corresponding cell of the first and second sets of cells; and generating a HARQ-ACK information bit (s) for a first PDSCH received on the corresponding cell and located outside of the candidate PDSCH reception occasions of the corresponding cell.
  • generating the HARQ-ACK codebook may include generating HARQ-ACK feedback for each cell of the first and second sets of cells, which may include: generating HARQ-ACK information bits for candidate PDSCH reception occasions of a corresponding cell of the first and second sets of cells; and generating a HARQ-ACK information bit (s) for a first PDSCH which can be potentially scheduled on the corresponding cell by the first DCI format or the second DCI format.
  • the HARQ-ACK codebook may include a first part and a second part; and generating the HARQ-ACK codebook may include: generating the first part including HARQ-ACK information bits for candidate PDSCH reception occasions of each cell of the first and second sets of cells and generating the second part including HARQ-ACK information bits for all cells which can be potentially scheduled by the first DCI format and the second DCI format with one PDSCH on each cell.
  • the HARQ-ACK information bits in the second part are arranged according to cell indexes of the first and second sets of cells. In some embodiments of the present disclosure, the HARQ-ACK information bits in the second part are arranged firstly according to associated cell set indexes and then according to associated serving cell indexes within a corresponding set of the first and second sets of cells.
  • the HARQ-ACK codebook may include a first part including HARQ-ACK information bits for candidate PDSCH reception occasions of each cell of the first and second sets of cells, and a second part including a HARQ-ACK information bit (s) for one or more PDSCHs among the first set and second sets of PDSCHs received on one or more cell (s) of the first and second sets of cells and located out of candidate PDSCH reception occasions of the one or more cell (s) of the first second sets of cells.
  • generating the HARQ-ACK codebook may include generating HARQ-ACK feedback for each cell of the first and second sets of cells, which may include: a first part including HARQ-ACK information bits for candidate PDSCH reception occasions of a corresponding cell of the first and second sets of cells; and a second part including a HARQ-ACK information bit (s) for a first PDSCH of the first and second sets of PDSCHs in response to the first PDSCH being received on the corresponding cell and located outside of the candidate PDSCH reception occasions of the corresponding cell.
  • the first DCI format includes an indicator indicating the same slot level offset for each of the first set of PDSCHs with reference to the slot where the first DCI format is received, and the HARQ-ACK feedback for the first set of PDSCHs is included in the HARQ-ACK feedback associated with the candidate PDSCH reception occasions on the first set of cells.
  • the first DCI format includes a first indicator indicating separate slot level offset for each of the first set of PDSCHs with reference to the slot where the first DCI format is received, and a second indicator indicating the slot where the HARQ-ACK codebook is transmitted with the restriction that the first set of PDSCHs is included in the candidate PDSCH reception occasions on associated cells of the first set of cells, and the HARQ-ACK feedback for the first set of PDSCHs is included in the HARQ-ACK feedback associated with candidate PDSCH reception occasions on the first set of cells.
  • the BS may include a transceiver, and a processor coupled to the transceiver.
  • the processor may be configured to: transmit, to a user equipment (UE) , a first downlink control information (DCI) format scheduling a first set of physical downlink shared channels (PDSCHs) on a first set of cells of the UE; and receive, from the UE, a hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook including HARQ-ACK feedback associated with candidate PDSCH reception occasions on the first set of cells and HARQ-ACK feedback for the first set of PDSCHs.
  • DCI downlink control information
  • PDSCHs physical downlink shared channels
  • the HARQ-ACK codebook may include: HARQ-ACK information bits for each cell of the first set of cells which are ordered according to associated serving cell index.
  • the HARQ-ACK information bits for each cell of the first set of cells may include: HARQ-ACK information bits for candidate PDSCH reception occasions of a corresponding cell; and a HARQ-ACK information bit (s) for a first PDSCH of the first set of PDSCHs transmitted on the corresponding cell and located outside of the candidate PDSCH reception occasions of the corresponding cell.
  • the HARQ-ACK information bits for the candidate PDSCH reception occasions of the corresponding cell and the HARQ-ACK information bit (s) for the first PDSCH are ordered according to PDSCH reception occasions on the corresponding cell.
  • the HARQ-ACK information bits for each cell of the first set of cells may include: HARQ-ACK information bits for candidate PDSCH reception occasions of the corresponding cell; and a HARQ-ACK information bit (s) for a first PDSCH which can be potentially scheduled on the corresponding cell by the first DCI format.
  • the HARQ-ACK information bit (s) for the first PDSCH is placed after or before the HARQ-ACK information bits for the candidate PDSCH reception occasions of the corresponding cell; and wherein the HARQ-ACK information bits for the candidate PDSCH reception occasions of the corresponding cell are arranged according to PDSCH reception occasions on the corresponding cell.
  • the HARQ-ACK information bit (s) for the first PDSCH is ACK or negative ACK (NACK) dependent on the decoding result of the first PDSCH.
  • the HARQ-ACK information bit (s) for the first PDSCH is NACK.
  • the HARQ-ACK codebook may include a first part and a second part, the first part may include HARQ-ACK information bits for candidate PDSCH reception occasions of each cell of the first set of cells, and the second part may include HARQ-ACK information bits for all cells which can be potentially scheduled by the first DCI format with one PDSCH on each cell.
  • a HARQ-ACK information bit (s) in the second part for the cell is negative ACK (NACK) ; and HARQ-ACK information bit (s) in the second part for a cell of the first set of cells scheduled by the first DCI format is ACK or NACK.
  • the HARQ-ACK information bit (s) for the second PDSCH in the first part for the cell is ACK or negative ACK (NACK) depending on a decoding result of the second PDSCH, or NACK.
  • the HARQ-ACK codebook may include a first part and a second part, the first part may include HARQ-ACK information bits for candidate PDSCH reception occasions of each cell of the first set of cells, and the second part may include a HARQ-ACK information bit (s) for one or more PDSCHs among the first set of PDSCHs transmitted on one or more cell (s) of the first set of cells and located out of candidate PDSCH reception occasions of the one or more cell (s) of the first set of cells.
  • the HARQ-ACK information bits in the first part for candidate PDSCH reception occasions of each cell of the first set of cells are arranged according to associated candidate PDSCH reception occasions.
  • the HARQ-ACK information bit (s) in the second part is arranged according to associated cell indexes.
  • the HARQ-ACK information bit (s) in the second part is arranged firstly according to associated PDSCH starting timing and then according to associated cell indexes.
  • the HARQ-ACK codebook may include: for each cell of the first set of cells, a first part including HARQ-ACK information bits for candidate PDSCH reception occasions of the corresponding cell; and a second part including a HARQ-ACK information bit (s) for a first PDSCH of the first set of PDSCHs in response to the first PDSCH being transmitted on the corresponding cell and located outside of the candidate PDSCH reception occasions of the corresponding cell.
  • the HARQ-ACK information bits for each cell of the first set of cells are arranged according to associated serving cell indices.
  • the processor is further configured to transmit, to the UE, a second DCI format scheduling a second set of PDSCHs on a second set of cells of the UE, wherein HARQ-ACK feedback for the second set of PDSCHs is to be multiplexed in the HARQ-ACK codebook.
  • each of the first and second sets of cells is a subset of a respective set of cells configured for multi-cell scheduling, or is a subset of the same set of cells configured for multi-cell scheduling.
  • the HARQ-ACK codebook may include HARQ-ACK feedback for each cell of the first and second sets of cells, which may include: HARQ-ACK information bits for candidate PDSCH reception occasions of a corresponding cell of the first and second sets of cells; and a HARQ-ACK information bit (s) for a first PDSCH transmitted on the corresponding cell and located outside of the candidate PDSCH reception occasions of the corresponding cell.
  • the HARQ-ACK codebook may include HARQ-ACK feedback for each cell of the first and second sets of cells, which may include: HARQ-ACK information bits for candidate PDSCH reception occasions of a corresponding cell of the first and second sets of cells; and a HARQ-ACK information bit (s) for a first PDSCH which can be potentially scheduled on the corresponding cell by the first DCI format or the second DCI format.
  • the HARQ-ACK codebook may include a first part and a second part, the first part may include HARQ-ACK information bits for candidate PDSCH reception occasions of each cell of the first and second sets of cells, and the second part may include HARQ-ACK information bits for all cells which can be potentially scheduled by the first DCI format and the second DCI format with one PDSCH on each cell.
  • the HARQ-ACK information bits in the second part are arranged according to cell indexes of the first and second sets of cells. In some embodiments of the present disclosure, wherein the HARQ-ACK information bits in the second part are arranged firstly according to associated cell set indexes and then according to associated serving cell indexes within a corresponding set of the first and second sets of cells.
  • the HARQ-ACK codebook may include a first part including HARQ-ACK information bits for candidate PDSCH reception occasions of each cell of the first and second sets of cells, and a second part including HARQ-ACK information bit (s) for one or more PDSCHs among the first set and second sets of PDSCHs transmitted on one or more cell (s) of the first and second sets of cells and located out of candidate PDSCH reception occasions of the one or more cell (s) of the first second sets of cells.
  • the HARQ-ACK codebook may include HARQ-ACK feedback for each cell of the first and second sets of cells, which may include: a first part including HARQ-ACK information bits for candidate PDSCH reception occasions of a corresponding cell of the first and second sets of cells; and a second part including a HARQ-ACK information bit (s) for a first PDSCH of the first and second sets of PDSCHs in response to the first PDSCH being transmitted on the corresponding cell and located outside of the candidate PDSCH reception occasions of the corresponding cell.
  • the first DCI format includes an indicator indicating the same slot level offset for each of the first set of PDSCHs with reference to the slot where the first DCI format is transmitted, and the HARQ-ACK feedback for the first set of PDSCHs is included in the HARQ-ACK feedback associated with the candidate PDSCH reception occasions on the first set of cells.
  • the first DCI format includes a first indicator indicating separate slot level offset for each of the first set of PDSCHs with reference to the slot where the first DCI format is transmitted and a second indicator indicating the slot where the HARQ-ACK codebook is transmitted with the restriction that the first set of PDSCHs is included in the candidate PDSCH reception occasions on associated cells of the first set of cells, and the HARQ-ACK feedback for the first set of PDSCHs is included in the HARQ-ACK feedback associated with candidate PDSCH reception occasions on the first set of cells.
  • Some embodiments of the present disclosure provide a method performed by a user equipment (UE) .
  • the method may include: receiving a first downlink control information (DCI) format scheduling a first set of physical downlink shared channels (PDSCHs) on a first set of cells of the UE; generating a hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook comprising HARQ-ACK feedback associated with candidate PDSCH reception occasions on the first set of cells and HARQ-ACK feedback for the first set of PDSCHs; and transmitting the HARQ-ACK codebook.
  • DCI downlink control information
  • PDSCHs physical downlink shared channels
  • HARQ-ACK hybrid automatic repeat request acknowledgement
  • Some embodiments of the present disclosure provide a method performed by a base station (BS) .
  • the method may include: transmitting, to a user equipment (UE) , a first downlink control information (DCI) format scheduling a first set of physical downlink shared channels (PDSCHs) on a first set of cells of the UE; and receiving, from the UE, a hybrid automatic repeat request acknowledgement (HARQ-ACK) codebook comprising HARQ-ACK feedback associated with candidate PDSCH reception occasions on the first set of cells and HARQ-ACK feedback for the first set of PDSCHs.
  • DCI downlink control information
  • PDSCHs physical downlink shared channels
  • the apparatus may include: at least one non-transitory computer-readable medium having stored thereon computer-executable instructions; at least one receiving circuitry; at least one transmitting circuitry; and at least one processor coupled to the at least one non-transitory computer-readable medium, the at least one receiving circuitry and the at least one transmitting circuitry, wherein the at least one non-transitory computer-readable medium and the computer executable instructions may be configured to, with the at least one processor, cause the apparatus to perform a method according to some embodiments of the present disclosure.
  • FIG. 1 illustrates a schematic diagram of a wireless communication system in accordance with some embodiments of the present disclosure
  • FIG. 2 illustrates a schematic diagram of PDSCH transmissions in accordance with some embodiments of the present disclosure
  • FIG. 3 illustrates a flow chart of an exemplary procedure of wireless communications in accordance with some embodiments of the present disclosure
  • FIGS. 4 and 5 illustrate schematic diagrams of HARQ-ACK codebook determination in accordance with some embodiments of the present disclosure
  • FIG. 6 illustrates a schematic diagram of PDSCH transmissions in accordance with some embodiments of the present disclosure
  • FIGS. 7-9 illustrate schematic diagrams of HARQ-ACK codebook determination in accordance with some embodiments of the present disclosure
  • FIG. 10 illustrates a schematic diagram of PDSCH transmissions in accordance with some embodiments of the present disclosure
  • FIGS. 11 illustrate a schematic diagram of HARQ-ACK codebook determination in accordance with some embodiments of the present disclosure
  • FIG. 12 illustrates a flow chart of an exemplary procedure of wireless communications in accordance with some embodiments of the present disclosure.
  • FIG. 13 illustrates a block diagram of an exemplary apparatus in accordance with some embodiments of the present disclosure.
  • FIG. 1 illustrates a schematic diagram of wireless communication system 100 in accordance with some embodiments of the present disclosure.
  • wireless communication system 100 may include some UEs 101 (e.g., UE 101a and UE 101b) and a base station (e.g., BS 102) . Although a specific number of UEs 101 and BS 102 is depicted in FIG. 1, it is contemplated that any number of UEs and BSs may be included in the wireless communication system 100.
  • the UE (s) 101 may include computing devices, such as desktop computers, laptop computers, personal digital assistants (PDAs) , tablet computers, smart televisions (e.g., televisions connected to the Internet) , set-top boxes, game consoles, security systems (including security cameras) , vehicle on-board computers, network devices (e.g., routers, switches, and modems) , or the like.
  • the UE (s) 101 may include a portable wireless communication device, a smart phone, a cellular telephone, a flip phone, a device having a subscriber identity module, a personal computer, a selective call receiver, or any other device that is capable of sending and receiving communication signals on a wireless network.
  • the UE (s) 101 includes wearable devices, such as smart watches, fitness bands, optical head-mounted displays, or the like. Moreover, the UE (s) 101 may be referred to as a subscriber unit, a mobile, a mobile station, a user, a terminal, a mobile terminal, a wireless terminal, a fixed terminal, a subscriber station, a user terminal, or a device, or described using other terminology used in the art.
  • the UE (s) 101 may communicate with the BS 102 via uplink (UL) communication signals.
  • UL uplink
  • the BS 102 may be distributed over a geographical region.
  • the BS 102 may also be referred to as an access point, an access terminal, a base, a base unit, a macro cell, a Node-B, an evolved Node B (eNB) , a gNB, a Home Node-B, a relay node, or a device, or described using other terminology used in the art.
  • the BS 102 is generally a part of a radio access network that may include one or more controllers communicably coupled to one or more corresponding BSs 102.
  • the BS 102 may communicate with UE (s) 101 via downlink (DL) communication signals.
  • DL downlink
  • the wireless communication system 100 may be compatible with any type of network that is capable of sending and receiving wireless communication signals.
  • the wireless communication system 100 is compatible with a wireless communication network, a cellular telephone network, a time division multiple access (TDMA) -based network, a code division multiple access (CDMA) -based network, an orthogonal frequency division multiple access (OFDMA) -based network, an LTE network, a 3GPP-based network, a 3GPP 5G network, a satellite communications network, a high-altitude platform network, and/or other communications networks.
  • TDMA time division multiple access
  • CDMA code division multiple access
  • OFDMA orthogonal frequency division multiple access
  • the wireless communication system 100 is compatible with 5G NR of the 3GPP protocol.
  • BS 102 may transmit data using an orthogonal frequency division multiple (OFDM) modulation scheme on the DL and the UE (s) 101 may transmit data on the UL using a discrete Fourier transform-spread-orthogonal frequency division multiplexing (DFT-S-OFDM) or cyclic prefix-OFDM (CP-OFDM) scheme.
  • DFT-S-OFDM discrete Fourier transform-spread-orthogonal frequency division multiplexing
  • CP-OFDM cyclic prefix-OFDM
  • the wireless communication system 100 may implement some other open or proprietary communication protocols, for example, WiMAX, among other protocols.
  • the BS 102 and UE (s) 101 may communicate using other communication protocols, such as the IEEE 802.11 family of wireless communication protocols. Further, in some embodiments of the present disclosure, the BS 102 and UE (s) 101 may communicate over licensed spectrums, whereas in some other embodiments, the BS 102 and UE (s) 101 may communicate over unlicensed spectrums.
  • the present disclosure is not intended to be limited to the implementation of any particular wireless communication system architecture or protocol.
  • a plurality of types of HARQ-ACK codebooks including for example, a Type-1 HARQ-ACK codebook (also referred to as “semi-static HARQ-ACK codebook” ) , may be defined for HARQ-ACK multiplexing for multiple received PDSCHs.
  • a Type-1 HARQ-ACK codebook also referred to as “semi-static HARQ-ACK codebook”
  • the definition of the Type-1 HARQ-ACK codebook is specified in 3GPP specifications.
  • the size of a Type-1 HARQ-ACK codebook may be independent of the actual scheduling situation.
  • the number of HARQ-ACK information bits may be determined based on a list of parameters, including, for example, PDSCH-to-HARQ timing values (also referred to as “HARQ-ACK feedback timing set” or “K1 set” ) , the maximum number of code block groups (CBGs) per transport block (TB) and the number of configured component carriers (CCs) , and/or other (s) .
  • the K1 set may be configured to a UE via an RRC signaling message or predefined in a standard (s) .
  • a UE may determine a time for transmitting a Type-1 HARQ-ACK codebook based on a PDSCH-to-HARQ_feedback timing indicator (hereinafter, “k1” ) in a scheduling DCI format, and determine candidate PDSCH reception occasions based on the time for transmitting the codebook and the K1 set.
  • the codebook may include HARQ-ACK information bits for these candidate PDSCH reception occasions, regardless of whether a PDSCH is actually scheduled within a candidate PDSCH reception occasion.
  • a communication technology may support a wide range of spectrums in different frequency ranges.
  • NR may support a wide range of spectrums in different frequency ranges.
  • the availability of the spectrum will be increased, which is possibly due to re-farming the bands originally used for previous cellular generation networks.
  • FR1 frequency range 1
  • FR2 frequency range 2
  • FR1 frequency range 2
  • FR2 frequency range 2
  • FR1 frequency range 2
  • scheduling mechanisms may only allow scheduling a single PUSCH or PDSCH on a single cell per a scheduling DCI. As more scattered spectrum bands or spectrums with wider bandwidth become available, it is advisable to allow simultaneous scheduling of multiple cells. To reduce control overhead, it is beneficial to extend from single-cell scheduling to multi-cell PUSCH/PDSCH scheduling with a single scheduling DCI. For example, a single DCI may schedule multiple PDSCHs or PUSCHs on multiple carriers configured to the UE, which referred to as multi-cell or multi-carrier scheduling in the context of the present disclosure.
  • a communication system e.g., NR
  • CCs component carriers
  • CA carrier aggregation
  • DC dual connectivity
  • a DCI format scheduling multiple PUSCHs on multiple cells is referred to as DCI format 0_X
  • a DCI format scheduling multiple PDSCHs on multiple cells is referred to as DCI format 1_X
  • a DCI format 0_X/1_X may schedule a single PDSCH per cell.
  • a single time domain resource allocation (TDRA) field in the DCI format 0_X/1_X may indicate one row of a TDRA table where each row of the TDRA table is configured with a separate start and length indication value (SLIV) , mapping type, and scheduling offset (e.g., K0/K2 as specified in 3GPP specifications) for each of co-scheduled PUSCHs/PDSCHs.
  • SLIV start and length indication value
  • K0/K2 scheduling offset
  • the reference PDSCH is the PDSCH ending last as indicated in the DCI format 1_X among the set of co-scheduled PDSCHs.
  • the co-scheduled PDSCHs on a non-reference cell may be outside of the candidate PDSCH reception occasions determined by the respective K1 set of the non-reference cell, where the reference cell is defined as the cell where the reference PDSCH is transmitted.
  • FIG. 2 illustrates a schematic diagram of PDSCH transmissions in accordance with some embodiments of the present disclosure.
  • a plurality of CCs may be configured for a UE.
  • the sub-carrier spacings (SCSs) of the carriers configured for a UE may be the same or different.
  • Each of the plurality of CCs may correspond to a respective cell (e.g., serving cell) or carrier of the UE.
  • Each carrier (serving cell) may be associated with a (serving) cell index.
  • a BS may transmit, to a UE, DCI 210 on CC 231 in slot n.
  • DCI 210 co-schedules four cells, i.e., CCs 231 to 234.
  • the serving cell indices of CCs 231 to 234 are: CC 231 ⁇ CC 232 ⁇ CC 233 ⁇ CC 234.
  • DCI 210 may indicate a specific row of TDRA table. It is assumed that the specific row indicates the K0 values of ⁇ 1, 6, 5, 2 ⁇ .
  • a UE can determine that DCI 210 schedules PDSCH 221 on CC 231 in slot n+1, PDSCH 222 on CC 232 in slot n+6, PDSCH 223 on CC 233 in slot n+5, and PDSCH 224 on CC 234 in slot n+2.
  • PDSCH 222 is used as the reference PDSCH since it is the latest PDSCH among 4 co-scheduled PDSCHs and cell 232 is regarded as the reference cell.
  • a PUCCH carrying HARQ-ACK feedback for the 4 co-scheduled PDSCHs is to be transmitted in slot n+9 (i.e., (slot n+6) + 3 slot) ) .
  • the candidate PDSCH reception occasions on each cell is determined in slots n+5 to n+8 according to the reverse order of k1 values in the K1 set (e.g., (slot n+9) -4, (slot n+9) -3, (slot n+9) -2, and (slot n+9) -1) .
  • k1 values in the K1 set e.g., (slot n+9) -4, (slot n+9) -3, (slot n+9) -2, and (slot n+9) -1) .
  • PDSCH 221 on CC 231 and PDSCH 224 on CC 234 are not included in the range of candidate PDSCH reception occasions on respective cells. In that sense, the Type-1 HARQ-ACK codebook would not include HARQ-ACK information bits for PDSCH 221 and PDSCH 224.
  • Embodiments of the present disclosure provide solutions for Type-1 HARQ-ACK codebook determination that can solve at least the above issues. For example, embodiments of the present disclosure provide solutions for including the HARQ-ACK information bit (s) for a PDSCH located outside of the candidate PDSCH reception occasions in the HARQ-ACK codebook. For example, embodiments of the present disclosure provide solutions for avoiding the scenario where a PDSCH scheduled by a DCI format is located outside of the candidate PDSCH reception occasions. More details on the embodiments of the present disclosure will be illustrated in the following text in combination with the appended drawings.
  • FIG. 3 illustrates a flow chart of an exemplary procedure 300 for wireless communications in accordance with some embodiments of the present disclosure. Details described in all of the foregoing embodiments of the present disclosure are applicable for the embodiments shown in FIG. 3.
  • the procedure may be performed by a UE, for example, UE 101 in FIG. 1.
  • the UE may be configured with Type-1 HARQ-ACK codebook and a set of cells for multi-cell scheduling using a DCI format 1_X.
  • all DCI formats 1_X are configured or predefined with the same set of cells for multi-cell scheduling.
  • separate DCI formats 1_X may schedule respective subsets of the same set of cells for multi-cell scheduling.
  • a plurality of sets of cells may be configured or predefined for multi-cell scheduling.
  • a cell included one cell set of the plurality of sets of cells may not be included in another cell set of the plurality of sets of cells.
  • the single set of cells or the plurality of sets of cells may or may not include all serving cells of the UE.
  • a DCI format 1_X may schedule a subset of cells in a cell set of the plurality of sets of cells and another DCI format 1_X may schedule a subset of cells in another cell set of the plurality of sets of cells.
  • the UE may receive a first DCI format (e.g., a DCI format 1_X as described above) scheduling a first set of PDSCHs on a first set of cells of the UE.
  • a first DCI format e.g., a DCI format 1_X as described above
  • the first set of cells may be a subset of cell set (hereinafter, first cell set) as described above.
  • a TDRA field in the first DCI format may indicate separate K0 value for each of co-scheduled PDSCHs.
  • the slot where the PUCCH carrying HARQ-ACK feedback for the co-scheduled PDSCHs is transmitted is determined according to the PDSCH which ends last among the co-scheduled PDSCHs as indicated by the TDRA field in the first DCI format and a HARQ-ACK feedback timing value indicated by the PDSCH-to-HARQ_feedback timing indicator field in the first DCI format.
  • Candidate PDSCH reception occasions on each cell of the first set of cells or the first cell set are determined according to the K1 set configured for the corresponding cell and the slot where the PUCCH is transmitted.
  • separate K1 sets may be configured or predefined for different cells.
  • the same K1 set may be configured or predefined for different cells.
  • the UE may generate a HARQ-ACK codebook including HARQ-ACK feedback associated with candidate PDSCH reception occasions on the first set of cells and HARQ-ACK feedback for the first set of PDSCHs.
  • the UE may transmit the HARQ-ACK codebook. For example, the HARQ-ACK codebook in the slot where the PUCCH is transmitted as determined above.
  • solutions for including the HARQ-ACK information bit (s) for a PDSCH located outside of the candidate PDSCH reception occasions in the HARQ-ACK codebook are provided (hereinafter, solution #1) .
  • solution #1 solutions for including the HARQ-ACK information bit (s) for a PDSCH located outside of the candidate PDSCH reception occasions in the HARQ-ACK codebook.
  • generating the HARQ-ACK codebook may include generating HARQ-ACK information bits for each cell of the first set of cells and concatenating the generated HARQ-ACK information bits for each cell of the first set of cells in order (e.g., a predefined order such as an ascending order or descending order) of associated serving cell index.
  • generating HARQ-ACK information bits for each cell of the first set of cells may include generating HARQ-ACK information bits for candidate PDSCH reception occasions of the corresponding cell; and generating a HARQ-ACK information bit (s) for a PDSCH (denoted as PDSCH #1A) of the first set of PDSCHs received on the corresponding cell and located outside of the candidate PDSCH reception occasions of the corresponding cell.
  • such PDSCH #1A may not exist, for example, when a PDSCH of the first set of PDSCHs scheduled on a specific cell of the first set of cell is located within the corresponding candidate PDSCH reception occasions of the specific cell. Accordingly, HARQ-ACK information bits for the specific cell may only include HARQ-ACK information bits for candidate PDSCH reception occasions of the specific cell.
  • the HARQ-ACK information bits for the candidate PDSCH reception occasions of the corresponding cell and the HARQ-ACK information bit (s) for PDSCH #1A (if any) are ordered according to PDSCH reception occasions on the corresponding cell (e.g., a predefined order thereof, such as an ascending order or descending order of the candidate PDSCH reception occasions on the corresponding cell) .
  • the HARQ-ACK information bit (s) for this candidate PDSCH reception occasion is HARQ-ACK information bit (s) for this PDSCH, that is, ACK or NACK depending on the decoding result of the PDSCH.
  • the HARQ-ACK information bit (s) for this candidate PDSCH reception occasion is NACK.
  • the first set of cells may be a subset of a cell set configured for multi-cell scheduling.
  • Generating the HARQ-ACK codebook may include generating HARQ-ACK information bits for each cell of the cell set and concatenating the generated HARQ-ACK information bits for each cell of the cell set in order (e.g., a predefined order such as an ascending order or descending order) of associated serving cell index.
  • the first DCI format can schedule the cell set but may not actually schedule all cells in the cell set.
  • the HARQ-ACK codebook may include HARQ-ACK information bits for a cell in the cell set that is not actually scheduled by the first DCI format.
  • the HARQ-ACK information bits for this cell may include HARQ-ACK information bits for candidate PDSCH reception occasions of this cell.
  • the HARQ-ACK information bit (s) for each candidate PDSCH reception occasion of this cell may indicate NACK.
  • HARQ-ACK codebook 450 may include HARQ-ACK information bits for each cell of CCs 231-234.
  • HARQ-ACK codebook 450 may include HARQ-ACK information bits a1 to a4 which respectively represent HARQ-ACK information bits for CCs 231-234, and are ordered in HARQ-ACK codebook 450 according to an ascending order of the associated cell indexes.
  • HARQ-ACK information bits a1 in FIG. 4 include HARQ-ACK information bits for candidate PDSCH reception occasions of CC 231 and a HARQ-ACK information bit (s) for PDSCH 221, which may be ordered according to the associated candidate PDSCH reception occasions. For example, assuming that the ascending order of candidate PDSCH reception occasions is employed and denoting the HARQ-ACK information bits for the four candidate PDSCH reception occasions of CC 231 in FIG. 2 as a1-1, a1-2, a1-3, and a1-4, and the HARQ-ACK information bit (s) for PDSCH 221 in FIG.
  • HARQ-ACK information bits a1 in FIG. 4 may be denoted as ⁇ a1-0, a1-1, a1-2, a1-3, a1-4 ⁇ .
  • a1-1, a1-2, a1-3, and a1-4 may be NACK when no PDSCH is actually scheduled on the corresponding candidate PDSCH reception occasions.
  • HARQ-ACK information bits a2 in FIG. 4 include HARQ-ACK information bits for candidate PDSCH reception occasions of CC 232, wherein the HARQ-ACK information bit (s) for the candidate PDSCH reception occasion of CC 232 in slot n+6 in FIG. 2 refers to the HARQ-ACK information bit (s) for PDSCH 222.
  • HARQ-ACK information bits a2 in FIG. 4 may be denoted as ⁇ a2-1, a2-0, a2-3, a2-4 ⁇ .
  • a2-1, a2-3, and a2-4 may be NACK when no PDSCH is actually scheduled on the corresponding candidate PDSCH reception occasions.
  • HARQ-ACK information bits a3 in FIG. 4 include HARQ-ACK information bits for candidate PDSCH reception occasions of CC 233, wherein the HARQ-ACK information bit (s) for the candidate PDSCH reception occasion of CC 233 in slot n+5 in FIG. 2 refers to the HARQ-ACK information bit (s) for PDSCH 223.
  • HARQ-ACK information bits a3 in FIG. 4 may be denoted as ⁇ a3-0, a3-2, a3-3, a3-4 ⁇ .
  • a3-2, a3-3, and a3-4 may be NACK when no PDSCH is actually scheduled on the corresponding candidate PDSCH reception occasions.
  • HARQ-ACK information bits a4 in FIG. 4 include HARQ-ACK information bits for candidate PDSCH reception occasions of CC 234 and a HARQ-ACK information bit (s) for PDSCH 224, which may be ordered according to the ascending order of candidate PDSCH reception occasions as assumed above. Denoting the HARQ-ACK information bits for the four candidate PDSCH reception occasions of CC 234 in FIG. 2 as a4-1, a4-2, a4-3, and a4-4, and the HARQ-ACK information bit (s) for PDSCH 224 in FIG.
  • HARQ-ACK information bits a4 in FIG. 4 may be denoted as ⁇ a4-0, a4-1, a4-2, a4-3, a4-4 ⁇ .
  • a4-1, a4-2, a4-3, and a4-4 may be NACK when no PDSCH is actually scheduled on the corresponding candidate PDSCH reception occasions.
  • a UE checks the K0 value for each of co-scheduled PDSCHs as indicated by the TDRA field and finds out the reference PDSCH which ends last among the co-scheduled PDSCHs.
  • the UE determines the slot where the PUCCH carrying HARQ-ACK feedback for the co-scheduled PDSCHs is transmitted.
  • the UE identifies the candidate PDSCH reception occasions for each cell of the co-scheduled cells (or configured cell set) according to the respective K1 set of each cell of the co-scheduled cells (or configured cell set) and the slot where the PUCCH is transmitted.
  • the UE generates HARQ-ACK information bits for each candidate PDSCH reception occasion on the cell;
  • the UE checks whether there is one or multiple PDSCHs which are scheduled by a multi-cell scheduling DCI format (s) (e.g., DCI format 1_X or the first DCI format) and located outside of the candidate PDSCH reception occasions on the cell;
  • a multi-cell scheduling DCI format e.g., DCI format 1_X or the first DCI format
  • the UE generates HARQ-ACK information bit (s) for the single PDSCH;
  • UE generates HARQ-ACK information bit (s) for the multiple PDSCHs.
  • the UE concatenates HARQ-ACK information bits for each cell of the co-scheduled cells (or configured cell set) as the Type-1 HARQ-ACK codebook for transmitting on the PUCCH.
  • a BS may transmit, to the UE, a DCI format scheduling a plurality of PDSCHs, and may receive, from the UE, a Type-1 HARQ-ACK codebook as generated above.
  • generating the HARQ-ACK codebook may include generating HARQ-ACK information bits for each cell of the first set of cells and concatenating the generated HARQ-ACK information bits for each cell of the first set of cells in order (e.g., a predefined order such as an ascending order or descending order) of associated serving cell index.
  • generating HARQ-ACK information bits for each cell of the first set of cells may include: generating HARQ-ACK information bits for candidate PDSCH reception occasions of the corresponding cell; and generating a HARQ-ACK information bit (s) for a PDSCH (denoted as PDSCH #1B) which can be potentially scheduled on the corresponding cell by the first DCI format.
  • the HARQ-ACK information bit (s) for this candidate PDSCH reception occasion is HARQ-ACK information bit (s) for this PDSCH, that is, ACK or NACK depending on the decoding result of the PDSCH.
  • the HARQ-ACK information bit (s) for this candidate PDSCH reception occasion is NACK.
  • the HARQ-ACK information bit (s) for a candidate PDSCH reception occasion is always NACK. For instance, even when a PDSCH is actually scheduled on a cell within a certain candidate PDSCH reception occasion of the cell, the HARQ-ACK information bit (s) for this candidate PDSCH reception occasion is NACK. This is because the HARQ-ACK information bit (s) for this PDSCH within the certain candidate PDSCH reception occasion of the cell can be indicated by HARQ-ACK information bit (s) for PDSCH #1B.
  • the HARQ-ACK information bit (s) for PDSCH #1B may always be included in the HARQ-ACK information bits for the corresponding cell, regardless of whether a PDSCH is actually scheduled by the first DCI format on the corresponding cell. For example, in the case that the corresponding cell or PDSCH #1B is not scheduled by the first DCI format, a NACK bit (s) may be generated (i.e., the HARQ-ACK information bit (s) for PDSCH #1B is NACK) .
  • an ACK or NACK bit (s) may be generated depending on the decoding result of PDSCH #1B scheduled on the corresponding cell (i.e., the HARQ-ACK information bit (s) for PDSCH #1B is ACK or NACK) .
  • the HARQ-ACK information bits for the candidate PDSCH reception occasions of the corresponding cell are ordered according to PDSCH reception occasions on the corresponding cell (e.g., a predefined order thereof, such as an ascending order or descending order of the candidate PDSCH reception occasions on the corresponding cell) .
  • the HARQ-ACK information bit (s) for PDSCH #1B on the corresponding cell is placed after or before the HARQ-ACK information bits for the candidate PDSCH reception occasions of the corresponding cell.
  • the first set of cells may be a subset of a cell set configured for multi-cell scheduling.
  • Generating the HARQ-ACK codebook may include generating HARQ-ACK information bits for each cell of the cell set and concatenating the generated HARQ-ACK information bits for each cell of the cell set in order (e.g., a predefined order such as an ascending order or descending order) of associated serving cell index.
  • the first DCI format can schedule the cell set but may not actually schedule all cells in the cell set.
  • the HARQ-ACK codebook may include HARQ-ACK information bits for a cell in the cell set that is not actually scheduled by the first DCI format.
  • the HARQ-ACK information bits for this cell may include HARQ-ACK information bits for candidate PDSCH reception occasions of this cell and HARQ-ACK information bit (s) for an assumed PDSCH #1B on this cell, all of which may be NACK when none PDSCH is actually scheduled on this cell.
  • the UE may generate a HARQ-ACK codebook to be transmitted in slot n+9.
  • An example HARQ-ACK codebook 550 according to Method #2 is shown in FIG. 5.
  • HARQ-ACK codebook 550 may include HARQ-ACK information bits for each cell of CCs 231-234.
  • HARQ-ACK codebook 550 may include HARQ-ACK information bits b1 to b4 which respectively represent HARQ-ACK information bits for CCs 231-234, and are ordered in HARQ-ACK codebook 550 according to an ascending order of the associated cell indexes.
  • HARQ-ACK information bits b1 in FIG. 5 include HARQ-ACK information bits for candidate PDSCH reception occasions of CC 231, which may be ordered according to the associated candidate PDSCH reception occasions, and a HARQ-ACK information bit (s) for PDSCH 221, which may be placed in front of or after the HARQ-ACK information bits for candidate PDSCH reception occasions of CC 231.
  • the ascending order of candidate PDSCH reception occasions is employed, and/or the HARQ-ACK information bit (s) for a potentially scheduled PDSCH is placed in front of the HARQ-ACK information bits for candidate PDSCH reception occasions.
  • HARQ-ACK information bits b1 in FIG. 5 may be denoted as ⁇ b1-0, b1-1, b1-2, b1-3, b1-4 ⁇ .
  • b1-1, b1-2, b1-3, and b1-4 may be NACK.
  • HARQ-ACK information bits b2 in FIG. 5 include HARQ-ACK information bits for candidate PDSCH reception occasions of CC 232, which may be ordered according to the associated candidate PDSCH reception occasions, and a HARQ-ACK information bit (s) for PDSCH 222, which may be placed in front of (as assumed above) the HARQ-ACK information bits for candidate PDSCH reception occasions of CC 232.
  • the HARQ-ACK information bit (s) for the candidate PDSCH reception occasion of CC 232 in slot n+6 in FIG. 2 may refer to the HARQ-ACK information bit (s) for PDSCH 222 or always be NACK.
  • the HARQ-ACK information bit (s) for this candidate PDSCH reception occasion indicates NACK.
  • denoting the HARQ-ACK information bit (s) for PDSCH 222 in FIG. 2 as b2-0 HARQ-ACK information bits b2 in FIG. 5 may be denoted as ⁇ b2-0, NACK, b2-0, NACK, NACK ⁇ or ⁇ b2-0, NACK, NACK, NACK, NACK ⁇ .
  • HARQ-ACK information bits b3 in FIG. 5 include HARQ-ACK information bits for candidate PDSCH reception occasions of CC 233, which may be ordered according to the associated candidate PDSCH reception occasions, and a HARQ-ACK information bit (s) for PDSCH 223, which may be placed in front of (as assumed above) the HARQ-ACK information bits for candidate PDSCH reception occasions of CC 233.
  • the HARQ-ACK information bit (s) for the candidate PDSCH reception occasion of CC 233 in slot n+5 in FIG. 2 may refer to the HARQ-ACK information bit (s) for PDSCH 223 or always be NACK.
  • the HARQ-ACK information bit (s) for this candidate PDSCH reception occasion indicates NACK.
  • HARQ-ACK information bits b3 in FIG. 5 may be denoted as ⁇ b3-0, b3-0, NACK, NACK, NACK ⁇ or ⁇ b3-0, NACK, NACK, NACK, NACK ⁇ .
  • HARQ-ACK information bits b4 in FIG. 5 include HARQ-ACK information bits for candidate PDSCH reception occasions of CC 234, which may be ordered according to the associated candidate PDSCH reception occasions, and a HARQ-ACK information bit (s) for PDSCH 224, which may be placed in front of (as assumed above) the HARQ-ACK information bits for candidate PDSCH reception occasions of CC 234.
  • the HARQ-ACK information bit (s) for this candidate PDSCH reception occasion indicates NACK.
  • the HARQ-ACK information bits b4 in FIG. 5 may be denoted as ⁇ b4-0, NACK, NACK, NACK, NACK ⁇ .
  • a UE checks the K0 value for each of co-scheduled PDSCHs as indicated by the TDRA field and finds out the reference PDSCH which ends last among the co-scheduled PDSCHs.
  • the UE determines the slot where the PUCCH carrying HARQ-ACK feedback for the co-scheduled PDSCHs is transmitted.
  • the UE identifies the candidate PDSCH reception occasions for each cell of the co-scheduled cells (or configured cell set) according to the respective K1 set of each cell of the co-scheduled cells (or configured cell set) and the slot where the PUCCH is transmitted.
  • the UE generates HARQ-ACK information bits for each candidate PDSCH reception occasion on the cell;
  • the UE generates HARQ-ACK information bit (s) for a PDSCH (e.g., PDSCH #1B) which can be potentially scheduled on the cell by a multi-cell DCI format (e.g., DCI format 1_X) .
  • a PDSCH e.g., PDSCH #1B
  • a multi-cell DCI format e.g., DCI format 1_X
  • the UE concatenates HARQ-ACK information bits for each cell of the co-scheduled cells (or configured cell set) as the Type-1 HARQ-ACK codebook for transmitting on the PUCCH.
  • a BS may transmit, to the UE, a DCI format scheduling a plurality of PDSCHs, and may receive, from the UE, a Type-1 HARQ-ACK codebook as generated above.
  • the HARQ-ACK codebook may include two parts (denoted as part #1C and part #2C for clarity) .
  • Generating the HARQ-ACK codebook may include: generating part #1C including HARQ-ACK information bits for candidate PDSCH reception occasions of each cell of the first set of cells and generating part #2C including HARQ-ACK information bits for all cells which can be potentially scheduled by the first DCI format with one PDSCH on each cell.
  • the HARQ-ACK information bit (s) for this candidate PDSCH reception occasion is HARQ-ACK information bit (s) for this PDSCH, that is, ACK or NACK depending on the decoding result of the PDSCH.
  • the HARQ-ACK information bit (s) for this candidate PDSCH reception occasion in part #1C refers to the HARQ-ACK information bit (s) for this PDSCH.
  • the HARQ-ACK information bit (s) for this candidate PDSCH reception occasion is NACK.
  • the HARQ-ACK information bit (s) for a candidate PDSCH reception occasion is always NACK. For instance, even when a PDSCH is actually scheduled on a cell within a certain candidate PDSCH reception occasion of the cell, the HARQ-ACK information bit (s) for this candidate PDSCH reception occasion is NACK. For instance, in the case that a PDSCH of the first set of PDSCHs is scheduled on a cell of the first set of cells and included within a candidate PDSCH reception occasion of the cell, the HARQ-ACK information bit (s) for this candidate PDSCH reception occasion in part #1C is NACK. This is because the HARQ-ACK information bit (s) for this actually scheduled PDSCH can be indicated by part #2C.
  • the HARQ-ACK information bits in part #1C may be ordered firstly according to candidate PDSCH reception occasions (e.g., a predefined order such as an ascending order or descending order of the candidate PDSCH reception occasions) for each of the first set of cells and then according to serving cell indexes of the first set of cells (e.g., a predefined order such as an ascending order or descending order of the serving cell indexes) .
  • candidate PDSCH reception occasions e.g., a predefined order such as an ascending order or descending order of the candidate PDSCH reception occasions
  • serving cell indexes of the first set of cells e.g., a predefined order such as an ascending order or descending order of the serving cell indexes
  • the first set of cells may be a subset of a cell set configured for multi-cell scheduling.
  • Generating part #1C may include generating HARQ-ACK information bits for candidate PDSCH reception occasions of each cell of the cell set (which may be ordered according to a predefined order such as an ascending order or descending order of the candidate PDSCH reception occasions of the corresponding cell) and concatenating the generated HARQ-ACK information bits according to associated serving cell indexes (e.g., a predefined order such as an ascending order or descending order of the serving cell indexes of the cell set) .
  • the first DCI format can schedule the cell set but may not actually schedule all cells in the cell set.
  • Part #1C may include HARQ-ACK information bits for candidate PDSCH reception occasions of a cell in the cell set that is not actually scheduled by the first DCI format.
  • cells that can be potentially scheduled by a multi-cell DCI format may refer to the cells in the corresponding configured cell set.
  • Part #2C may include HARQ-ACK information bits for all cells which can be potentially scheduled by the first DCI format with one PDSCH on each cell, regardless of whether a cell of such cells is actually scheduled by the first DCI format or not.
  • a cell which can be potentially scheduled by the first DCI format is not included in the first set of cells (i.e., not actually scheduled)
  • a HARQ-ACK information bit (s) in part #2C for this cell is NACK.
  • HARQ-ACK information bit (s) in the part #2C for a cell of the first set of cells scheduled by the first DCI format is ACK or NACK, depending on the decoding result of a PDSCH scheduled on this cell.
  • the HARQ-ACK information bits in part #2C may be arranged according to associated cell indexes (e.g., a predefined order such as an ascending order or descending order of the serving cell indexes of the configured cell set) .
  • part #1C and part #2C may be arranged in the HARQ-ACK codebook according to a predefined order. For example, part #1C is placed firstly in the HARQ-ACK codebook and followed by part #2C. For example, part #2C is placed firstly in the HARQ-ACK codebook and followed by part #1C.
  • the number of HARQ-ACK information bits in part #2C may be based on (e.g., is equal to) M, where M denotes the maximum number of transport blocks (TBs) which can be co-scheduled by a DCI format 1_X (e.g., the first DCI format) in a PUCCH group for the UE.
  • the number of HARQ-ACK information bits in part #2C may be based on (e.g., is equal to) N, where N is the maximum number of cells which can be co-scheduled by a DCI format 1_X (e.g., the first DCI format) in the PUCCH group for the UE.
  • a UE may be configured with a set of cells including CCs 631 to 634 for multi-cell scheduling by a DCI format 1_X.
  • the serving cell indices of CCs 631 to 634 are: CC 631 ⁇ CC 632 ⁇ CC 633 ⁇ CC 634.
  • the UE may receive, from a BS, DCI 610 on CC 631 in slot n. It is assumed that DCI 610 co-schedules 3 cells, i.e., CCs 631 to 633. DCI 610 may indicate a specific row of TDRA table, which indicates the K0 values of ⁇ 1, 6, 5, 2 ⁇ . Based on the indicated K0 values and the number of co-scheduled cells (e.g., assumed as 3) , a UE can determine that DCI 610 schedules PDSCH 621 on CC 631 in slot n+1, PDSCH 622 on CC 632 in slot n+6, and PDSCH 623 on CC 633 in slot n+5.
  • PDSCH 622 is used as the reference PDSCH since it is the latest PDSCH among 3 co-scheduled PDSCHs and cell 632 is regarded as the reference cell. It is assumed that the PDSCH-to-HARQ_feedback timing indicator field in DCI 610 indicates a k1 value of 3, then a PUCCH carrying HARQ-ACK feedback for the 3 co-scheduled PDSCHs is to be transmitted in slot n+9 (i.e., (slot n+6) + 3 slot) ) .
  • the candidate PDSCH reception occasions on each cell is determined in slots n+5 to n+8 according to the reverse order of k1 values in the K1 set.
  • the UE may generate HARQ-ACK codebook 750 as shown in FIG. 7 according to Method #3 for transmission in slot n+9 (e.g., on PUCCH 760 as shown in FIG. 7) .
  • HARQ-ACK codebook 750 includes part 751 and part 752.
  • Part 751 includes HARQ-ACK information bits for candidate PDSCH reception occasions on each of the configure cell set for multi-cell scheduling.
  • Part 752 includes HARQ-ACK information bits for all cells of the configure cell set with one PDSCH on each cell.
  • denoting the HARQ-ACK information bits for the candidate PDSCH reception occasions of CCs 631-634 in FIG. 6 respectively as c1 to c4, part 751 in FIG. 7 may be arranged as ⁇ c1, c2, c3, c4 ⁇ .
  • denoting the HARQ-ACK information bits for PDSCHs 621 to 623 in FIG. 6 respectively as c5 to c7 and the HARQ-ACK information bits for a PDSCH potential scheduled on CC 634 in FIG. 6 as c8, part 752 in FIG. 7 may be arranged as ⁇ c5, c6, c7, c8 ⁇ .
  • c8 may indicate NACK.
  • HARQ-ACK information bits c1 in FIG. 7 include HARQ-ACK information bits for four candidate PDSCH reception occasions of CC 631 in FIG. 6, which may be ordered according to the associated candidate PDSCH reception occasions.
  • HARQ-ACK information bits c2, c3, or c4 in FIG. 7 include HARQ-ACK information bits for four candidate PDSCH reception occasions of CC 632, 633, or 634 in FIG. 6, which may be ordered according to the associated candidate PDSCH reception occasions.
  • HARQ-ACK information bits c1 in FIG. 7 may be denoted as ⁇ c1-1, c1-2, c1-3, c1-4 ⁇ .
  • the HARQ-ACK information bit (s) for this candidate PDSCH reception occasion indicates NACK.
  • c1-1, c1-2, c1-3, and c1-4 may be NACK.
  • the HARQ-ACK information bit (s) for this candidate PDSCH reception occasion refers to the HARQ-ACK information bit (s) for this PDSCH.
  • the HARQ-ACK information bit (s) for a candidate PDSCH reception occasion of a cell may always indicate NACK.
  • the HARQ-ACK information bit (s) for the candidate PDSCH reception occasion of CC 632 in slot n+6 in FIG. 6 may refer to the HARQ-ACK information bit (s) for PDSCH 622 (e.g., c6) since PDSCH 622 is scheduled in slot n+6 on CC 632, or may always be NACK.
  • HARQ-ACK information bits c2 in FIG. 7 may be denoted as ⁇ NACK, c6, NACK, NACK ⁇ or ⁇ NACK, NACK, NACK, NACK ⁇ .
  • the HARQ-ACK information bit (s) for the candidate PDSCH reception occasion of CC 633 in slot n+5 in FIG. 6 may refer to the HARQ-ACK information bit (s) for PDSCH 623 (e.g., c7) since PDSCH 623 is scheduled in slot n+5 on CC 633, or may always be NACK.
  • HARQ-ACK information bits c3 in FIG. 7 may be denoted as ⁇ c7, NACK, NACK, NACK ⁇ or ⁇ NACK, NACK, NACK, NACK ⁇ .
  • HARQ-ACK information bits c4 in FIG. 7 may be denoted as ⁇ NACK, NACK, NACK, NACK ⁇ .
  • a UE checks the K0 value for each of co-scheduled PDSCHs as indicated by the TDRA field and finds out the reference PDSCH which ends last among the co-scheduled PDSCHs.
  • the UE determines the slot where the PUCCH carrying HARQ-ACK feedback for the co-scheduled PDSCHs is transmitted.
  • the UE identifies the candidate PDSCH reception occasions for each of the configured cell set according to the respective K1 set of each cell of the configured cell set and the slot where the PUCCH is transmitted.
  • the UE generates part #1C comprising HARQ-ACK information bits for each candidate PDSCH reception occasion for each cell of co-scheduled cells (or configured cell set) and orders the generated HARQ-ACK information bits firstly according to (e.g., in an ascending order of) candidate PDSCH reception occasions for each cell of the co-scheduled cells (or configured cell set) and then according to (e.g., in an ascending order of) serving cell indexes of the co-scheduled cells (or configured cell set) .
  • the UE generates part #2C comprising HARQ-ACK information bits for the configured cell set.
  • the UE orders the HARQ-ACK information bits for the configured cell set according to (e.g., in an ascending order of) serving cell indexes of the configured cell set.
  • the HARQ-ACK information bits for the configured cell set are ordered according to (e.g., in an ascending order of) PDSCH starting timing, and if there are two or more PDSCHs having the same staring timing, then the HARQ-ACK information bits for the two or more PDSCHs having the same staring timing are ordered according to (e.g., in an ascending order of) associated serving cell indexes.
  • the UE concatenates part #1C and part #2C as the HARQ-ACK codebook for transmitting on the PUCCH.
  • a BS may transmit, to the UE, a DCI format scheduling a plurality of PDSCHs, and may receive, from the UE, a Type-1 HARQ-ACK codebook as generated above.
  • the HARQ-ACK codebook may include two parts (denoted as part #1D and part #2D for clarity) .
  • Generating the HARQ-ACK codebook may include: generating part #1D including HARQ-ACK information bits for candidate PDSCH reception occasions of each cell of the first set of cells and generating part #2D including a HARQ-ACK information bit (s) for one or more PDSCHs among the first set of PDSCHs received on one or more cell (s) of the first set of cells and located outside of candidate PDSCH reception occasions of the one or more cell (s) of the first set of cells.
  • part #1D and part #2D may be arranged in the HARQ-ACK codebook according to a predefined order. For example, part #1D is placed firstly in the HARQ-ACK codebook and followed by part #2D. For example, part #2D is placed firstly in the HARQ-ACK codebook and followed by part #1D.
  • part #1C in Method #3 may apply to part #1D in Method #4, except that for part #1D, when a PDSCH is actually scheduled on a cell within a certain candidate PDSCH reception occasion of the cell, the HARQ-ACK information bit (s) for this candidate PDSCH reception occasion is HARQ-ACK information bit (s) for this PDSCH, that is, ACK or NACK depending on the decoding result of the PDSCH.
  • the HARQ-ACK information bit (s) for such candidate PDSCH reception occasion may not always indicate NACK.
  • the HARQ-ACK information bits in part #1D for candidate PDSCH reception occasions of each cell of the first set of cells may be arranged according to associated candidate PDSCH reception occasions.
  • part #1D may include HARQ-ACK information bits for candidate PDSCH reception occasions of a cell in the configured cell set that is not actually scheduled by the first DCI format.
  • the HARQ-ACK information bit (s) in part #2D is arranged according to associated cell indexes. In some embodiments of the present disclosure, the HARQ-ACK information bit (s) in part #2D is arranged firstly according to associated PDSCH starting timing and then according to associated cell indexes.
  • the UE may generate a HARQ-ACK codebook to be transmitted in slot n+9.
  • An example HARQ-ACK codebook 850 according to Method #4 is shown in FIG. 8 and may be transmitted on PUCCH 860.
  • HARQ-ACK codebook 850 includes part 851 and part 852.
  • Part 851 includes HARQ-ACK information bits for candidate PDSCH reception occasions on each of CCs 231-234 (e.g., the cells scheduled by DCI 210 or the configure cell set for multi-cell scheduling) .
  • Part 852 includes HARQ-ACK information bits for PDSCHs 221 and 224 among the PDSCHs scheduled by DCI 210 in FIG. 2 received on CCs 231 and 234 and located outside of candidate PDSCH reception occasions of CCs 231 and 234.
  • part 851 may be arranged as ⁇ d1, d2, d3, d4 ⁇ .
  • denoting the HARQ-ACK information bits for PDSCHs 221 and 224 in FIG. 2 respectively as d5 and d6, part 852 in FIG. 8 may be arranged as ⁇ d5, d6 ⁇ .
  • HARQ-ACK information bits d1 in FIG. 8 include HARQ-ACK information bits for four candidate PDSCH reception occasions of CC 231 in FIG. 2, which may be ordered according to the associated candidate PDSCH reception occasions.
  • HARQ-ACK information bits d2, d3, or d4 in FIG. 8 include HARQ-ACK information bits for four candidate PDSCH reception occasions of CC 232, 233, or 234 in FIG. 2, which may be ordered according to the associated candidate PDSCH reception occasions.
  • HARQ-ACK information bits d1 in FIG. 8 may be denoted as ⁇ d1-1, d1-2, d1-3, d1-4 ⁇ .
  • the HARQ-ACK information bit (s) for this candidate PDSCH reception occasion indicates NACK.
  • d1-1, d1-2, d1-3, and d1-4 may be NACK.
  • HARQ-ACK information bits d1 in FIG. 8 may be denoted as ⁇ NACK, NACK, NACK, NACK ⁇ .
  • HARQ-ACK information bits d4 in FIG. 8 may be denoted as ⁇ NACK, NACK, NACK, NACK ⁇ .
  • the HARQ-ACK information bit (s) for this candidate PDSCH reception occasion refers to the HARQ-ACK information bit (s) for this PDSCH.
  • the HARQ-ACK information bit (s) for the candidate PDSCH reception occasion of CC 232 in slot n+6 in FIG. 2 may refer to the HARQ-ACK information bit (s) for PDSCH 222 since PDSCH 222 is scheduled in slot n+6 on CC 632.
  • denoting the HARQ-ACK information bit (s) for PDSCH 222 as d2-0, HARQ-ACK information bits d2 in FIG. 8 may be denoted as ⁇ NACK, d2-0, NACK, NACK ⁇ .
  • HARQ-ACK information bits d3 in FIG. 8 may be denoted as ⁇ d3-0, NACK, NACK, NACK ⁇ .
  • a UE checks the K0 value for each of co-scheduled PDSCHs as indicated by the TDRA field and finds out the reference PDSCH which ends last among the co-scheduled PDSCHs.
  • the UE determines the slot where the PUCCH carrying HARQ-ACK feedback for the co-scheduled PDSCHs is transmitted.
  • the UE identifies the candidate PDSCH reception occasions for each of the co-scheduled cells (or configured cell set) according to the respective K1 set of each of the co-scheduled cells (or configured cell set) and the slot where the PUCCH is transmitted.
  • the UE generates part #1D comprising HARQ-ACK information bits for each candidate PDSCH reception occasion for each cell of the co-scheduled cells (or configured cell set) and orders the generated HARQ-ACK information bits firstly according to (e.g., in an ascending order of) candidate PDSCH reception occasions for each of the co-scheduled cells (or configured cell set) and then according to (e.g., in an ascending order of) serving cell indexes of the co-scheduled cells (or configured cell set) .
  • the UE checks whether there is one or multiple PDSCHs scheduled by a multi-cell scheduling DCI format (s) (e.g., DCI format 1_X, or the first DCI format) and located outside of the candidate PDSCH reception occasions for each cell of the co-scheduled cells.
  • a multi-cell scheduling DCI format e.g., DCI format 1_X, or the first DCI format
  • the UE If there is only a single PDSCH scheduled by the DCI format and located outside of the candidate PDSCH reception occasions for the associated cell, the UE generates part #2D including HARQ-ACK information bit (s) for the single PDSCH.
  • the UE If there are multiple PDSCHs scheduled by the DCI format and located outside of the candidate PDSCH reception occasions on respective cells, the UE generates part #2D including HARQ-ACK information bits for the multiple PDSCHs and orders the HARQ-ACK information bits for the multiple PDSCHs.
  • the HARQ-ACK information bits for the multiple PDSCHs are ordered according to (e.g., in an ascending order of) associated serving cell indexes.
  • the HARQ-ACK information bits for the multiple PDSCHs are ordered according to (e.g., in an ascending order of) PDSCH starting timing. If there are two or more PDSCHs among the multiple PDSCHs having the same staring timing, then the HARQ-ACK information bits for the two or more PDSCHs are ordered according to (e.g., in an ascending order of) associated serving cell indexes.
  • the UE concatenates part #1D and part #2D as the Type-1 HARQ-ACK codebook for transmitting on the PUCCH.
  • a BS may transmit, to the UE, a DCI format scheduling a plurality of PDSCHs, and may receive, from the UE, a Type-1 HARQ-ACK codebook as generated above.
  • generating the HARQ-ACK codebook may include for each cell of the first set of cells, generating a part (denoted as part #1E) including HARQ-ACK information bits for candidate PDSCH reception occasions of a corresponding cell.
  • the HARQ-ACK information bits for candidate PDSCH reception occasions in part #1E are ordered according to associated PDSCH reception occasions (e.g., a predefined order, such as an ascending order or descending order of the candidate PDSCH reception occasions on the corresponding cell) .
  • generating the HARQ-ACK codebook may further include generating another part (denoted as part #2E) for this cell.
  • Part #2E includes a HARQ-ACK information bit (s) for PDSCH #1E.
  • the UE may concatenate part #1E and part #2E for this cell to form the HARQ-ACK feedback for this cell.
  • part #1E and part #2E may be concatenated according to a predefined order. For example, part #1E is placed in front of part #2E. For example, part #2E is placed in front of part #1E.
  • the HARQ-ACK information bits for each cell of the first set of cells are arranged according to associated serving cell indices (e.g., a predefined order such as an ascending order or descending order of the serving cell indexes of the first set of cells) .
  • the first set of cells may be a subset of a cell set configured for multi-cell scheduling.
  • Generating the HARQ-ACK codebook may further include for a cell (s) in the configured cell set that can be scheduled but not actually scheduled by the first DCI format, generating part (s) #1E for such cell (s) .
  • the HARQ-ACK information bits for each cell of the configured cell set are arranged according to associated serving cell indices (e.g., a predefined order such as an ascending order or descending order of the serving cell indexes of the configured cell set) .
  • the UE may generate a HARQ-ACK codebook to be transmitted in slot n+9.
  • An example HARQ-ACK codebook 950 according to Method #5 is shown in FIG. 9.
  • part #1E is placed in front of part #2E and an ascending order of the serving cell indexes is employed for arranging HARQ-ACK information bits for each cell.
  • HARQ-ACK codebook 950 may include HARQ-ACK information bits e1 and a HARQ-ACK information bit (s) f1 for CC 231 in FIG. 2, HARQ-ACK information bits e2 for CC 232 in FIG. 2, HARQ-ACK information bits e3 for CC 233 in FIG. 2, and HARQ-ACK information bits e4 and a HARQ-ACK information bit (s) f4 for CC 234 in FIG. 2.
  • HARQ-ACK information bits e1 to e4 respectively denote HARQ-ACK information bits for candidate PDSCH reception occasions of CCs 231 to 234 in FIG. 2.
  • the HARQ-ACK information bits f1 and f4 respectively denote HARQ-ACK information bits for PDSCHs 221 and 224 in FIG. 2.
  • the HARQ-ACK information bit (s) for this candidate PDSCH reception occasion refers to the HARQ-ACK information bit (s) for this PDSCH.
  • the HARQ-ACK information bit (s) for this candidate PDSCH reception occasion indicates NACK.
  • HARQ-ACK information bits e1 to e4 may be denoted as ⁇ NACK, NACK, NACK, NACK ⁇ , ⁇ NACK, f2, NACK, NACK ⁇ , ⁇ f3, NACK, NACK, NACK ⁇ , and ⁇ NACK, NACK, NACK, NACK ⁇ , respectively.
  • a UE checks the K0 value for each of co-scheduled PDSCHs as indicated by the TDRA field and finds out the reference PDSCH which ends last among the co-scheduled PDSCHs.
  • the UE determines the slot where the PUCCH carrying HARQ-ACK feedback for the co-scheduled PDSCHs is transmitted.
  • the UE identifies the candidate PDSCH reception occasions for each of the co-scheduled cells (or configured cell set) according to the respective K1 set of each of the co-scheduled cells (or configured cell set) and the slot where the PUCCH is transmitted.
  • the UE generates part #1E including HARQ-ACK information bits for each candidate PDSCH reception occasion on the cell;
  • the UE checks whether there is one or multiple PDSCHs which are scheduled by a multi-cell scheduling DCI format (s) (e.g., DCI format 1_X or the first DCI format) and located outside of the candidate PDSCH reception occasions on the cell;
  • a multi-cell scheduling DCI format e.g., DCI format 1_X or the first DCI format
  • the UE generates part #2E including HARQ-ACK information bit (s) for the single PDSCH;
  • the UE generates part #2E including HARQ-ACK information bit (s) for the multiple PDSCHs.
  • the UE concatenates HARQ-ACK information bits for each cell of the co-scheduled cells (or configured cell set) as the Type-1 HARQ-ACK codebook for transmitting on the PUCCH.
  • a BS may transmit, to the UE, a DCI format scheduling a plurality of PDSCHs, and may receive, from the UE, a Type-1 HARQ-ACK codebook as generated above.
  • all DCI formats 1_X are configured or predefined with the same set of cells for multi-cell scheduling; and in some other embodiments, a plurality of sets of cells may be configured or predefined for multi-cell scheduling.
  • Methods e.g., Methods #1 to #5 described above with respect to solution #1 are applicable to both cases.
  • the UE may receive a second DCI format scheduling a second set of PDSCHs on a second set of cells of the UE, wherein HARQ-ACK feedback for the second set of PDSCHs is to be multiplexed in the HARQ-ACK codebook.
  • each of the first and second sets of cells is a subset of a respective set of cells configured for multi-cell scheduling, or is a subset of the same set of cells configured for multi-cell scheduling.
  • Method #1 is employed.
  • generating the HARQ-ACK codebook may include generating HARQ-ACK feedback for each cell of the first and second sets of cells, which may include: generating HARQ-ACK information bits for candidate PDSCH reception occasions of a corresponding cell of the first and second sets of cells; and generating a HARQ-ACK information bit (s) for a PDSCH (denoted as PDSCH #1A’) received on the corresponding cell and located outside of the candidate PDSCH reception occasions of the corresponding cell.
  • a UE may be configured with a plurality of cells (e.g., CCs 1031-1038) , and a plurality sets of cells (e.g., cell set 1070 and cell set 1071) for multi-cell scheduling.
  • Cell set 1070 may include CCs 1031-1034 and Cell set 1071 may include CCs 1035 and 1036.
  • CCs 1037 and 1038 may not be used for multi-cell scheduling.
  • the serving cell indices of CCs 1031-1038 are: CC 1031 ⁇ CC 1032 ⁇ CC 1033 ⁇ CC 1034 ⁇ CC 1035 ⁇ CC 1036 ⁇ CC 1037 ⁇ CC 1038.
  • DCI 1010 transmitted in slot n on CC 1031 may schedule PDSCH 1021 in slot n+1 on CC 1031, PDSCH 1022 in slot n+6 on CC 1032, and PDSCH 1023 in slot n+5 on CC 1033. That is, DCI 1010 does not schedule CC 1034 in cell set 1070.
  • DCI 1011 transmitted in slot n on CC 1035 may schedule PDSCH 1024 in slot n+5 on CC 1035, and PDSCH 1025 in slot n+3 on CC 1036.
  • the UE may determine that HARQ-ACK information bits for PDSCHs 1021-1025 are to be multiplexed in the same PUCCH in slot n+9, and candidate PDSCH reception occasions for each cell of CCs 1031-1038 are in slots n+5 to n+8.
  • the HARQ-ACK information bits for PDSCHs 1021-1025 are denoted as h1 to h5, respectively.
  • the UE may generate a HARQ-ACK codebook of ⁇ ⁇ h1, NACK, NACK, NACK, NACK ⁇ , ⁇ NACK, h2, NACK, NACK ⁇ , ⁇ h3, NACK, NACK, NACK ⁇ , ⁇ NACK, NACK, NACK, NACK ⁇ , ⁇ h4, NACK, NACK, NACK ⁇ , ⁇ h5, NACK, NACK, NACK, NACK ⁇ ⁇ NACK, NACK, NACK, NACK ⁇ , ⁇ NACK, NACK, NACK, NACK ⁇ .
  • Method #2 is employed.
  • generating the HARQ-ACK codebook may include generating HARQ-ACK feedback for each cell of the first and second sets of cells, which may include: generating HARQ-ACK information bits for candidate PDSCH reception occasions of a corresponding cell of the first and second sets of cells; and generating a HARQ-ACK information bit (s) for a PDSCH (denoted as PDSCH #1B’) which can be potentially scheduled on the corresponding cell by the first DCI format or the second DCI format.
  • the UE may generate a HARQ-ACK codebook of ⁇ ⁇ h1, NACK, NACK, NACK, NACK ⁇ , ⁇ h2, NACK, NACK, NACK ⁇ , ⁇ h3, NACK, NACK, NACK, NACK ⁇ , ⁇ NACK, NACK, NACK, NACK ⁇ , ⁇ h4, NACK, NACK, NACK ⁇ , ⁇ h5, NACK, NACK, NACK, NACK ⁇ , ⁇ NACK, NACK, NACK, NACK ⁇ , ⁇ NACK, NACK, NACK, NACK ⁇ ⁇ NACK, NACK, NACK ⁇ ⁇ .
  • the UE may generate a HARQ-ACK codebook of ⁇ ⁇ h1, NACK, NACK, NACK, NACK ⁇ , ⁇ h2, NACK, h2, NACK, NACK ⁇ , ⁇ h3, h3, NACK, NACK, NACK ⁇ , ⁇ NACK, NACK, NACK, NACK ⁇ , ⁇ h4, h4, NACK, NACK, NACK ⁇ , ⁇ h5, NACK, NACK, NACK, NACK ⁇ , ⁇ NACK, NACK, NACK, NACK ⁇ , ⁇ NACK, NACK, NACK, NACK ⁇ ⁇ .
  • Method #3 is employed.
  • the HARQ-ACK codebook may include part #1C’ and part #2C’.
  • Generating the HARQ-ACK codebook may include: generating part #1C’ including HARQ-ACK information bits for candidate PDSCH reception occasions of each cell of the first and second sets of cells and generating part #2C’ including HARQ-ACK information bits for all cells which can be potentially scheduled by the first DCI format and the second DCI format with one PDSCH on each cell.
  • the HARQ-ACK information bits in part #2C’ are arranged according to cell indexes of the first and second sets of cells. In some embodiments of the present disclosure, the HARQ-ACK information bits in part #2C’ are arranged firstly according to associated cell set indexes and then according to associated serving cell indexes within a corresponding set of the first and second sets of cells.
  • the number of HARQ-ACK information bits in part #2C’ may be based on (e.g., equal to) M’*Z, where M’ is the maximum number of TBs which can be co-scheduled by a DCI format 1_X in a PUCCH group for the UE and Z is the number of cell sets configured for the UE in the same PUCCH group.
  • the number of HARQ-ACK information bits in part #2C’ may be based on (e.g., equal to) M 1 +M 2 +...+M Z , where M 1 , M 2 , ..., M Z are the respective maximum number of TBs of each cell in the plurality of cell sets in the same PUCCH group for the UE and Z is the number of cell sets configured for the UE in the same PUCCH group.
  • M’ max (M 1 , M 2 , ..., M Z ) .
  • the number of HARQ-ACK information bits in part #2C’ may be based on (e.g., equal to) N’*Z, where N’ is the maximum number of cells which can be co-scheduled by a DCI format 1_X in the PUCCH group for the UE (e.g., the total number of cells in the plurality of cell sets) and Z is the number of cell sets configured for the UE in the same PUCCH group.
  • the UE may generate HARQ-ACK codebook 1150 as shown in FIG. 11 for transmitting on PUCCH 1160.
  • HARQ-ACK codebook 1150 may include two parts, i.e., part 1151 (e.g., part #1C’) may be denoted as ⁇ g1, g2, g3, g4, g5, g6, g7, g8 ⁇ and part 1152 (e.g., part #2C’) may be denoted as ⁇ h1, h2, h3, NACK, h4, h5 ⁇ , wherein g1, g2, g3, g4, g5, g6, g7 and g8 respectively denote HARQ-ACK information bits for candidate PDSCH reception occasions of cells in the configured cell sets (e.g., cell sets 1070 and 1071) corresponding to DCI 1010 and DCI 1011 and HARQ-ACK information bits for candidate PDSCH reception
  • part 1151 e.g., part #1C’
  • part 1152
  • the HARQ-ACK codebook may include part #1D’ including HARQ-ACK information bits for candidate PDSCH reception occasions of each cell of the first and second sets of cells, and part #2D’ including a HARQ-ACK information bit (s) for one or more PDSCHs among the first set and second sets of PDSCHs received on one or more cell (s) of the first and second sets of cells and located outside of candidate PDSCH reception occasions of the one or more cell (s) of the first second sets of cells.
  • the UE may generate a HARQ-ACK codebook of ⁇ ⁇ i1, i2, i3, i4, i5, i6, i7, i8 ⁇ , ⁇ h1, h5 ⁇ ⁇ , wherein i1, i2, i3, i4, i5, i6, i7 and i8 respectively denote HARQ-ACK information bits for candidate PDSCH reception occasions of cells in the configured cell sets (e.g., cell sets 1070 and 1071) corresponding to DCI 1010 and DCI 1011 and HARQ-ACK information bits for candidate PDSCH reception occasions of cells 1037 and 1038.
  • the configured cell sets e.g., cell sets 1070 and 1071
  • Method #5 is employed.
  • generating the HARQ-ACK codebook may include generating HARQ-ACK feedback for each cell of the first and second sets of cells, which comprises: part #1E’ including HARQ-ACK information bits for candidate PDSCH reception occasions of a corresponding cell of the first and second sets of cells; and part #2E’ including a HARQ-ACK information bit (s) for a PDSCH (denoted as PDSCH #1E’) of the first and second sets of PDSCHs in response to PDSCH #1E’ being received on the corresponding cell and located outside of the candidate PDSCH reception occasions of the corresponding cell.
  • the UE may generate a HARQ-ACK codebook of ⁇ ⁇ h1, j1 ⁇ , j2, j3, j4, j5, ⁇ h5, j6 ⁇ ⁇ , j7, j8 ⁇ , wherein j1, j2, j3, j4, j5, j6, j7 and j8 respectively denote HARQ-ACK information bits for candidate PDSCH reception occasions of cells in the configured cell sets (e.g., cell sets 1070 and 1071) corresponding to DCI 1010 and DCI 1011 and HARQ-ACK information bits for candidate PDSCH reception occasions of cells 1037 and 1038.
  • the configured cell sets e.g., cell sets 1070 and 1071
  • both the BS and the UE should synchronize the same reference PDSCH for the UE to determine the slot where the HARQ-ACK feedback for the co-scheduled PDSCHs is transmitted, the same candidate PDSCH reception occasions on each cell of the co-scheduled cells or the configured cell set, and the same understanding on HARQ-ACK information bits for candidate PDSCH reception occasions on all cells of the co-scheduled cells or the configured cell set.
  • solutions for avoiding the scenario where a PDSCH scheduled by a DCI format is located outside of the candidate PDSCH reception occasions are provided (hereinafter, solution #2) .
  • solution #2 solutions for avoiding the scenario where a PDSCH scheduled by a DCI format is located outside of the candidate PDSCH reception occasions.
  • various methods can be employed to achieve solution #2.
  • the TDRA field in the DCI format 1_X should indicate the same K0 value for each of co-scheduled PDSCHs, i.e., the co-scheduled PDSCHs should be scheduled in the same slot.
  • the UE does not expect to be indicated with different K0 values for each of co-scheduled PDSCHs.
  • the BS should make sure that the TDRA field in a DCI format 1_X should indicate the same K0 value for each of co-scheduled PDSCHs.
  • the first DCI format received in operation 311 of FIG. 3 may include an indicator indicating the same slot level offset for each of the first set of PDSCHs with reference to the slot where the first DCI format is received, and the HARQ-ACK feedback for the first set of PDSCHs may be included in the HARQ-ACK feedback associated with the candidate PDSCH reception occasions on the first set of cells.
  • the co-scheduled PDSCHs should be included in candidate PDSCH reception occasions on associated cells.
  • the K0 value configuration for each co-scheduled cell in the TDRA table and K1 set for each co-scheduled cell as well as the k1 value indicated by PDSCH-to-HARQ_feedback timing indicator in the DCI format 1_X may be set in a certain way to achieve this purpose, for example, they may satisfy below condition:
  • a max is the maximum K0 value for the co-scheduled cells
  • B max is the maximum k1 value among the K1 set for cell X
  • K 0 is the K0 value for cell X
  • k is the k1 value indicated by PDSCH-to-HARQ_feedback timing indicator in the DCI format 1_X
  • n is the slot where the reference PDSCH is transmitted
  • the reference PDSCH is the PDSCH with the largest K0 value among the co-scheduled PDSCHs.
  • Table 1 an example TDRA table configured for multi-cell scheduling (only K0 is given for illustrative purpose)
  • One example which satisfies the condition is shown in Table 2.
  • Table 2 an example TDRA table configured for multi-cell scheduling (Only K0 is given for illustrative purpose)
  • the gist of this method is that when a DCI format 1_X is transmitted for co-scheduling multiple PDSCHs on multiple cells, it should make sure that the co-scheduled PDSCHs are included in the candidate PDSCH reception occasions on associated cells. For example, the first DCI format received in operation 311 of FIG.
  • 3 may include a first indicator indicating separate slot level offset for each of the first set of PDSCHs with reference to the slot where the first DCI format is received, and a second indicator indicating the slot where the HARQ-ACK codebook is transmitted with the restriction that the first set of PDSCHs is included in the candidate PDSCH reception occasions on associated cells of the first set of cells, and the HARQ-ACK feedback for the first set of PDSCHs is included in the HARQ-ACK feedback associated with candidate PDSCH reception occasions on the first set of cells.
  • FIG. 12 illustrates a flow chart of an exemplary procedure 1200 for wireless communications in accordance with some embodiments of the present disclosure. Details described in all of the foregoing embodiments of the present disclosure are applicable for the embodiments shown in FIG. 12.
  • the procedure may be performed by a BS, for example, BS 102 in FIG. 1.
  • a BS may transmit, to a UE, a first DCI format scheduling a first set of PDSCHs on a first set of cells of the UE.
  • the descriptions with respect to the first DCI format and DCI format 1_X in the forgoing may be applied to the first DCI format in operation 1211.
  • the BS may receive, from the UE, a HARQ-ACK codebook including HARQ-ACK feedback associated with candidate PDSCH reception occasions on the first set of cells and HARQ-ACK feedback for the first set of PDSCH.
  • the HARQ-ACK codebook may be generated by the UE according to one of Methods #1 to #7 as described above.
  • the HARQ-ACK codebook may include HARQ-ACK information bits for each cell of the first set of cells which are ordered according to associated serving cell index.
  • the HARQ-ACK information bits for each cell of the first set of cells may include HARQ-ACK information bits for candidate PDSCH reception occasions of a corresponding cell; and a HARQ-ACK information bit (s) for a first PDSCH of the first set of PDSCHs transmitted on the corresponding cell and located outside of the candidate PDSCH reception occasions of the corresponding cell.
  • the HARQ-ACK information bits for the candidate PDSCH reception occasions of the corresponding cell and the HARQ-ACK information bit (s) for the first PDSCH are ordered according to PDSCH reception occasions on the corresponding cell.
  • the HARQ-ACK codebook may include HARQ-ACK information bits for each cell of the first set of cells which are ordered according to associated serving cell index.
  • the HARQ-ACK information bits for each cell of the first set of cells may include: HARQ-ACK information bits for candidate PDSCH reception occasions of the corresponding cell; a HARQ-ACK information bit (s) for a first PDSCH which can be potentially scheduled on the corresponding cell by the first DCI format.
  • the HARQ-ACK information bit (s) for the first PDSCH is placed after or before the HARQ-ACK information bits for the candidate PDSCH reception occasions of the corresponding cell.
  • the HARQ-ACK information bits for the candidate PDSCH reception occasions of the corresponding cell are arranged according to PDSCH reception occasions on the corresponding cell.
  • the HARQ-ACK information bit (s) for the first PDSCH is ACK or NACK dependent on the decoding result of the first PDSCH. In some embodiments, in the case that the first PDSCH is not scheduled on the corresponding cell by the first DCI format, the HARQ-ACK information bit (s) for the first PDSCH is NACK.
  • the HARQ-ACK codebook may include a first part and a second part, the first part may include HARQ-ACK information bits for candidate PDSCH reception occasions of each cell of the first set of cells, and the second part may include HARQ-ACK information bits for all cells which can be potentially scheduled by the first DCI format with one PDSCH on each cell.
  • a HARQ-ACK information bit (s) in the second part for the cell is NACK.
  • HARQ-ACK information bit (s) in the second part for a cell of the first set of cells scheduled by the first DCI format is ACK or NACK.
  • the HARQ-ACK information bit (s) for the second PDSCH in the first part for the cell is ACK or NACK depending on a decoding result of the second PDSCH, or NACK.
  • the HARQ-ACK information bits in the first part for candidate PDSCH reception occasions of each cell of the first set of cells are arranged according to associated candidate PDSCH reception occasions.
  • the HARQ-ACK information bit (s) in the second part is arranged according to associated cell indexes.
  • the HARQ-ACK codebook may include a first part and a second part, the first part may include HARQ-ACK information bits for candidate PDSCH reception occasions of each cell of the first set of cells, and the second part may include a HARQ-ACK information bit (s) for one or more PDSCHs among the first set of PDSCHs transmitted on one or more cell (s) of the first set of cells and located out of candidate PDSCH reception occasions of the one or more cell (s) of the first set of cells.
  • the HARQ-ACK information bits in the first part for candidate PDSCH reception occasions of each cell of the first set of cells are arranged according to associated candidate PDSCH reception occasions.
  • the HARQ-ACK information bit (s) in the second part is arranged according to associated cell indexes. In some embodiments, the HARQ-ACK information bit (s) in the second part is arranged firstly according to associated PDSCH starting timing and then according to associated cell indexes.
  • the HARQ-ACK codebook may include: for each cell of the first set of cells, a first part comprising HARQ-ACK information bits for candidate PDSCH reception occasions of the corresponding cell; and a second part comprising a HARQ-ACK information bit (s) for a first PDSCH of the first set of PDSCHs in response to the first PDSCH being transmitted on the corresponding cell and located outside of the candidate PDSCH reception occasions of the corresponding cell.
  • the HARQ-ACK information bits for each cell of the first set of cells are arranged according to associated serving cell indices.
  • the BS may further transmit, to the UE, a second DCI format scheduling a second set of PDSCHs on a second set of cells of the UE, wherein HARQ-ACK feedback for the second set of PDSCHs is to be multiplexed in the HARQ-ACK codebook.
  • each of the first and second sets of cells is a subset of a respective set of cells configured for multi-cell scheduling. In some embodiments of the present disclosure, each of the first and second sets of cells is a subset of the same set of cells configured for multi-cell scheduling.
  • the HARQ-ACK codebook may include HARQ-ACK feedback for each cell of the first and second sets of cells, which may include: HARQ-ACK information bits for candidate PDSCH reception occasions of a corresponding cell of the first and second sets of cells; and a HARQ-ACK information bit (s) for a first PDSCH transmitted on the corresponding cell and located outside of the candidate PDSCH reception occasions of the corresponding cell.
  • the HARQ-ACK codebook may include HARQ-ACK feedback for each cell of the first and second sets of cells, which may include: HARQ-ACK information bits for candidate PDSCH reception occasions of a corresponding cell of the first and second sets of cells; and a HARQ-ACK information bit (s) for a first PDSCH which can be potentially scheduled on the corresponding cell by the first DCI format or the second DCI format.
  • the HARQ-ACK codebook may include a first part and a second part, the first part may include HARQ-ACK information bits for candidate PDSCH reception occasions of each cell of the first and second sets of cells, and the second part may include HARQ-ACK information bits for all cells which can be potentially scheduled by the first DCI format and the second DCI format with one PDSCH on each cell.
  • the HARQ-ACK information bits in the second part are arranged according to cell indexes of the first and second sets of cells. In some embodiments, the HARQ-ACK information bits in the second part are arranged firstly according to associated cell set indexes and then according to associated serving cell indexes within a corresponding set of the first and second sets of cells.
  • the HARQ-ACK codebook may include a first part comprising HARQ-ACK information bits for candidate PDSCH reception occasions of each cell of the first and second sets of cells, and a second part comprising HARQ-ACK information bit (s) for one or more PDSCHs among the first set and second sets of PDSCHs transmitted on one or more cell (s) of the first and second sets of cells and located out of candidate PDSCH reception occasions of the one or more cell (s) of the first second sets of cells.
  • the HARQ-ACK codebook may include HARQ-ACK feedback for each cell of the first and second sets of cells, which may include: a first part comprising HARQ-ACK information bits for candidate PDSCH reception occasions of a corresponding cell of the first and second sets of cells; and a second part comprising a HARQ-ACK information bit (s) for a first PDSCH of the first and second sets of PDSCHs in response to the first PDSCH being transmitted on the corresponding cell and located outside of the candidate PDSCH reception occasions of the corresponding cell.
  • the first DCI format may include an indicator indicating the same slot level offset for each of the first set of PDSCHs with reference to the slot where the first DCI format is transmitted, and the HARQ-ACK feedback for the first set of PDSCHs is included in the HARQ-ACK feedback associated with the candidate PDSCH reception occasions on the first set of cells.
  • the first DCI format may include a first indicator indicating separate slot level offset for each of the first set of PDSCHs with reference to the slot where the first DCI format is transmitted and a second indicator indicating the slot where the HARQ-ACK codebook is transmitted with the restriction that the first set of PDSCHs is included in the candidate PDSCH reception occasions on associated cells of the first set of cells, and the HARQ-ACK feedback for the first set of PDSCHs is included in the HARQ-ACK feedback associated with candidate PDSCH reception occasions on the first set of cells.
  • FIG. 13 illustrates a block diagram of an exemplary apparatus 1300 according to some embodiments of the present disclosure.
  • the apparatus 1300 may include at least one processor 1306 and at least one transceiver 1302 coupled to the processor 1306.
  • the apparatus 1300 may be a UE or a BS.
  • the transceiver 1302 may be divided into two devices, such as a receiving circuitry and a transmitting circuitry.
  • the apparatus 1300 may further include an input device, a memory, and/or other components.
  • the apparatus 1300 may be a UE.
  • the transceiver 1302 and the processor 1306 may interact with each other so as to perform the operations with respect to the UE described in FIGS. 1-12.
  • the apparatus 1300 may be a BS.
  • the transceiver 1302 and the processor 1306 may interact with each other so as to perform the operations with respect to the BS described in FIGS. 1-12.
  • the apparatus 1300 may further include at least one non-transitory computer-readable medium.
  • the non-transitory computer-readable medium may have stored thereon computer-executable instructions to cause the processor 1306 to implement the method with respect to the UE as described above.
  • the computer-executable instructions when executed, cause the processor 1306 interacting with transceiver 1302 to perform the operations with respect to the UE described in FIGS. 1-12.
  • the non-transitory computer-readable medium may have stored thereon computer-executable instructions to cause the processor 1306 to implement the method with respect to the BS as described above.
  • the computer-executable instructions when executed, cause the processor 1306 interacting with transceiver 1302 to perform the operations with respect to the BS described in FIGS. 1-12.
  • a software module may reside in RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, a hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
  • the operations or steps of a method may reside as one or any combination or set of codes and/or instructions on a non-transitory computer-readable medium, which may be incorporated into a computer program product.
  • the terms “includes, “ “including, “ or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
  • An element proceeded by “a, “ “an, “ or the like does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element.
  • the term “another” is defined as at least a second or more.
  • the term “having” and the like, as used herein, are defined as "including.
  • Expressions such as “A and/or B” or “at least one of A and B” may include any and all combinations of words enumerated along with the expression.
  • the expression “A and/or B” or “at least one of A and B” may include A, B, or both A and B.
  • the wording "the first, " “the second” or the like is only used to clearly illustrate the embodiments of the present application, but is not used to limit the substance of the present application.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

Des modes de réalisation de la présente divulgation concernent des procédés et des appareils de détermination de livre de codes d'accusé de réception de demande de répétition automatique hybride (HARQ-ACK) de type 1 (semi-statique). Selon certains modes de réalisation de la divulgation, un UE peut : recevoir un premier format d'informations de commande de liaison descendante (DCI) planifiant un premier ensemble de canaux physiques partagés descendants (PDSCH) sur un premier ensemble de cellules de l'UE ; générer un livre de codes HARQ-ACK comprenant une rétroaction HARQ-ACK associée à des occasions de réception de PDSCH candidates sur le premier ensemble de cellules et une rétroaction HARQ-ACK pour le premier ensemble de PDSCH ; et transmettre le livre de codes HARQ-ACK.
PCT/CN2022/130429 2022-11-07 2022-11-07 Procédé et appareil de détermination de livre de codes harq-ack de type 1 WO2024082355A1 (fr)

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CN111436153A (zh) * 2019-01-11 2020-07-21 华为技术有限公司 一种信息处理方法、终端设备及网络设备
WO2021097656A1 (fr) * 2019-11-19 2021-05-27 Lenovo (Beijing) Limited Procédé et appareil de détermination d'un livre de codes harq-ack dynamique amélioré
CN115118395A (zh) * 2021-03-19 2022-09-27 维沃移动通信有限公司 Harq ack反馈方法、装置、终端及存储介质
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