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EP-3902175-B1 - METHOD AND APPARATUS FOR DETERMINING HARQ-ACK CODEBOOK AND INFORMATION

EP3902175B1EP 3902175 B1EP3902175 B1EP 3902175B1EP-3902175-B1

Inventors

  • GOU, WEI
  • HAO, PENG
  • HAN, Xianghui
  • FU, TING

Dates

Publication Date
20260513
Application Date
20191227

Claims (10)

  1. A method for determining a Hybrid Automatic Repeat Request-Acknowledge, HARQ-ACK, codebook, comprising: setting (S102) a plurality of physical downlink shared channel, PDSCH, candidate resources having an overlapped time domain in a downlink slot into one or more candidate resource groups, and determining HARQ-ACK information corresponding to the one or more candidate resource groups; and determining (S104) a semi-static HARQ-ACK codebook according to the HARQ-ACK information, wherein the PDSCH candidate resources are determined in response to that an end symbol of each of the PDSCH candidate resources is within a subslot n-k1 in response to that the semi-static HARQ-ACK codebook is transmitted in a subslot n, k1 is a value in a value set of a parameter of HARQ-ACK timing, and the value in the value set of the parameter of HARQ-ACK timing is in units of subslots.
  2. The method according to claim 1, wherein determining the HARQ-ACK information corresponding to the one or more candidate resource groups comprises: determining, for each candidate resource group in a downlink subslot of the downlink slot, a position, in the downlink subslot, of the HARQ-ACK information corresponding to the candidate resource group, according to the PDSCH candidate resource with an earliest end position in the candidate resource group.
  3. The method according to claim 1 or 2, wherein determining the semi-static HARQ-ACK codebook comprises: counting the HARQ-ACK information corresponding to each candidate resource group into a downlink subslot of the downlink slot, and determining a position of the HARQ-ACK information corresponding to the candidate resource group in the semi-static HARQ-ACK codebook according to a sequence of downlink subslots of the downlink slot; and the method further comprises: determining, when any candidate resource group of another downlink subslot is counted in the downlink subslot, HARQ-ACK information corresponding to the counted candidate resource group in the downlink subslot, and determining a position of the HARQ-ACK information in the semi-static HARQ-ACK codebook.
  4. The method according to any one of claims 1 to 3, wherein setting the plurality of PDSCH candidate resources having the overlapped time domain in the downlink slot into the one or more candidate resource groups comprises: determining the PDSCH candidate resource with an earliest end position in the downlink slot; and dividing the PDSCH candidate resource with the earliest end position and the PDSCH candidate resource having an overlapped time domain with the PDSCH candidate resource with the earliest end position into one candidate resource group.
  5. The method according to claim 4, further comprising: determining the PDSCH candidate resource with an earliest end position among the PDSCH candidate resources in the downlink slot except the PDSCH candidate resources divided into the candidate resource group; and dividing the PDSCH candidate resource with the earliest end position and the PDSCH candidate resource having an overlapped time domain with the PDSCH candidate resource with the earliest end position into another candidate resource group, until all the PDSCH candidate resources in the downlink slot are divided into the candidate resource groups.
  6. The method according to any one of claims 1 to 3, wherein when a downlink subslot in the downlink slot is empty, NACK information is filled into the semi-static HARQ-ACK codebook, or HARQ-ACK information of 0 bits is determined in the downlink subslot.
  7. The method according to claim 6, wherein the downlink subslot is determined to be empty by one of: determining that there is no PDSCH candidate resource or candidate resource group in the downlink subslot, and there is no counted PDSCH candidate resource or candidate resource group in the downlink subslot; or determining that any PDSCH candidate resource or candidate resource group exists in the downlink subslot but is prohibited from being counted in the downlink subslot, and there is no counted PDSCH candidate resource or candidate resource group in the downlink subslot; or the downlink subslot is determined to be non-empty by one of: determining that any counted candidate resource group exists in the downlink subslot; or determining that any PDSCH candidate resource or candidate resource group exists in the downlink subslot, and the PDSCH candidate resource or the candidate resource group is not counted in another downlink subslot.
  8. The method according to claim 7, wherein determining that the PDSCH candidate resource or the candidate resource group exists in the downlink subslot comprises: determining that a symbol corresponding to an end position of the PDSCH candidate resource exists in the downlink subslot, and/or determining that a symbol corresponding to a start position of the PDSCH candidate resource exists in the downlink subslot.
  9. An apparatus for determining a Hybrid Automatic Repeat Request-Acknowledge, HARQ-ACK, codebook, comprising: a setting module (52) configured to set a plurality of physical downlink shared channel, PDSCH, candidate resources having an overlapped time domain in a downlink slot into one or more candidate resource groups, and determine HARQ-ACK information corresponding to the one or more candidate resource group; and a first determination module (54) configured to determine a semi-static HARQ-ACK codebook according to the HARQ-ACK information, wherein the PDSCH candidate resources are determined in response to that an end symbol of each of the PDSCH candidate resources is within a subslot n-k1 in response to that the semi-static HARQ-ACK codebook is transmitted in a subslot n, k1 is a value in a value set of a parameter of HARQ-ACK timing, and the value in the value set of the parameter of HARQ-ACK timing is in units of subslots.
  10. A storage medium having a computer program stored thereon, wherein the computer program is configured to, when executed, cause the method according to any one of claims 1 to 8 to be implemented.

Description

The present application claims priority from Chinese patent application No. 201910028691.9, entitled "METHOD AND APPARATUS FOR DETERMINING HARQ-ACK CODEBOOK AND INFORMATION" filed with the China Patent Office on January 11, 2019. TECHNICAL FIELD The present application relates to the field of communications, and in particular to a method and an apparatus for determining a HARQ-ACK codebook. BACKGROUND In the research of NR R16, in order to support Ultra Reliable Low Latency Communication (URLLC) service transmission and reduce time transmission of Hybrid Automatic Repeat Request-Acknowledge (HARQ-ACK) corresponding to a Physical Downlink Shared Channel (PDSCH) in the downlink transmission, some companies have proposed a Physical Uplink Control Channel (PUCCH) for transmitting HARQ-ACK multiple times in one uplink slot, so as to reduce HARQ-ACK transmission latency. Optionally, in order to support the above functions, a solution is provided in which a slot is divided into multiple subslots so that both an uplink slot and a downlink slot are correspondingly divided into multiple subslots, and then the subslots are used as slots in an existing slot-based method to determine a timing position of HARQ-ACK and a PUCCH resource. However, when the downlink slot is also divided into subslots correspondingly, since allocation of the existing PDSCH candidate resources is determined based on a slot manner, if the allocation of the existing PDSCH candidate resources is reused, there may be a case where the PDSCH allocated for one or more PDSCH candidate resources is cross-subslot. Then, there are problems with how to deal with the case of a cross-subslot PDSCH candidate resource, especially how to determine the semi-static HARQ-ACK codebook. However, no solution has proposed yet in the related art. A document "URLLC/eMBB differentiation and enhancement to semi-static ACK/NACK codebook" analyzes the related issues of semi-static HARQ-ACK codebook if the DL intra-UE Tx prioritization/multiplexing is supported for URLLC in Rl6, and proposes that eMBB and URLLC should be differentiated in the physical layer of NR Rel-16 w/o binding a certain transmission mechanism with URLLC, DL intra-UE multiplexing should be supported in order to transmit URLLC in time, and an enhancement of semi-static HARQ-ACK codebook should be considered in NR Rel-16. European Patent application EP 3876454A1 provides an HARQ-ACK codebook determination method and apparatus, a terminal and a storage medium. The method includes: dividing candidate PDSCHs in at least one slot into groups according to candidate PDSCH types and end times of the candidate PDSCHs, and forming pieces of HARQ-ACK information corresponding to the divided candidate PDSCHs; and concatenating the pieces of HARQ-ACK information corresponding to the candidate PDSCHs to obtain an HARQ-ACK codebook. SUMMARY The embodiment of the present application provides a method and an apparatus for determining a HARQ-ACK codebook which can solve at least the problem that a semi-static HARQ-ACK codebook cannot be determined when a PDSCH candidate resource is cross-subslot in the related art. The invention is set out in the appended set of claims. By means of the present application, the problem that a semi-static HARQ-ACK codebook cannot be determined when a PDSCH candidate resource is cross-subslot can be solved, thereby yielding the effect of meeting the HARQ-ACK requirement in the case that the PDSCH candidate resource is cross-subslot. BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide optical further understanding of the present application and are incorporated in and constitute a part of the present application, illustrate embodiment(s) of the present application and together with the description serve to explain the present application and not to limit the present application. In the drawings: Fig. 1 is a flowchart of determining a HARQ-ACK codebook;Fig. 2 is a schematic diagram of determined slots of a HARQ-ACK codebook;Fig. 3 is a schematic diagram of determined slots of another HARQ-ACK codebook;Fig. 4 is a flowchart of determining HARQ-ACK information;Fig. 5 is a block diagram of an apparatus for determining an HARQ-ACK codebook; andFig. 6 is a block diagram of an apparatus for determining HARQ-ACK information. DETAILED DESCRIPTION The present application will be described in detail below with reference to the accompanying drawings in conjunction with the embodiment. It should be also noted that terms "first", "second", and the like in the description, claims and drawings of the present application are used for the purpose of distinguishing similar objects instead of indicating a specific order or sequence. In the embodiment, provided is a method for determining an HARQ-ACK codebook. Fig. 1 is a flowchart of determining a HARQ-ACK codebook. As shown in Fig. 1, the flow includes the following steps. At step S102, setting a plurality of PDSCH candida