HARQ-ACK feedback method, terminal and base station

Patent metadata

Field	Value
Publication number	US-12432015-B2
Application number	US-202117918123-A
Country	US
Kind code	B2
Filing date	Apr 12, 2021
Priority date	Apr 23, 2020
Publication date	Sep 30, 2025
Grant date	Sep 30, 2025

Abstract

Disclosed are a hybrid automatic repeat request-acknowledgment (HARQ-ACK) feedback method, a terminal, and a base station. The method includes: transmitting broadcast multicast scheduling signaling to a terminal for indicating the terminal to multiplex, when it is detected that a preset condition is satisfied, a first HARQ-ACK codebook corresponding to the broadcast multicast scheduling signaling on the uplink resource corresponding to unicast, the preset condition being that both a HARQ-ACK feedback slot indicated by the broadcast multicast scheduling signaling and a slot in which the uplink resource is located exist in a preset window; and receiving uplink data transmitted by the terminal through the uplink resource when the preset condition is satisfied, and obtaining a first HARQ-ACK codebook multiplexed on the uplink resource. The protocol design and complexity of HARQ-ACK feedback for broadcast multicast is simplified.

First claim

What is claimed is:

1. A hybrid automatic repeat request-acknowledgment (HARQ-ACK) feedback method, performed by a terminal, comprising:
receiving broadcast/multicast scheduling signaling transmitted by a base station, and determining an uplink resource corresponding to unicast;
multiplexing, in response to detecting that a preset condition is satisfied, a first HARQ-ACK codebook corresponding to the broadcast/multicast scheduling signaling on the uplink resource corresponding to unicast, the preset condition being that both a HARQ-ACK feedback slot indicated by the broadcast/multicast scheduling signaling and a slot in which the uplink resource is located exist within a preset window,
wherein a start reference position of the preset window comprises at least one of:
a position of the HARQ-ACK feedback slot indicated by the broadcast/multicast scheduling signaling; or
a slot in which the PUCCH resource indicated by the unicast scheduling signaling is located; or
an end time of a physical downlink shared channel (PDSCH) corresponding to the broadcast/multicast scheduling signaling; or
a slot in which one of periodic uplink resources configured by the base station is located; or
a time for receiving broadcast/multicast scheduling signaling; and
wherein the start position offset and/or the length of the preset window satisfies any of the following:
the start position offset of the preset window is a positive value, a negative value, or 0 in response to the start reference position being a position of the HARQ-ACK feedback slot indicated by the broadcast/multicast scheduling signaling or a position of the slot in which the PUCCH resource indicated by the unicast scheduling signaling is located, a length of the preset window is one slot; or
the start position offset is d in response to the start reference position being the end time of the PDSCH corresponding to the broadcast/multicast scheduling signaling, wherein d is greater than or equal to the sum of a processing time for receiving PDSCH by the terminal and a time for multiplexing the first HARQ-ACK codebook corresponding to the broadcast/multicast scheduling signaling; or
the start position offset is a negative value in response to the start reference position being a slot in which one of the periodic uplink resources configured by the base station is located, or
the start position offset is a positive value or 0 in response the start reference position being a time for receiving the broadcast/multicast scheduling signaling, and the length of the preset window is from the start position to a position of the HARQ-ACK feedback slot indicated by the broadcast/multicast scheduling signaling.

2. The method of claim 1 , wherein the determining the uplink resource corresponding to unicast comprises:
receiving unicast scheduling signaling transmitted by the base station, wherein the unicast scheduling signaling carries scheduling information for the uplink resource; or
receiving periodic uplink resource information configured by the base station through higher layer signaling, and determining the uplink resource corresponding to the unicast based on the periodic uplink resource information, wherein the periodic uplink resource information comprises a transmission period and a slot offset of the uplink resource,
wherein the uplink resource is a physical uplink control channel (PUCCH) resource or a physical uplink shared channel (PUSCH) resource;
wherein
a second DCI corresponding to the unicast scheduling signaling comprises a response message used for indicating the terminal whether to carry the first HARQ-ACK codebook in the uplink resource.

3. The method of claim 2 , wherein
the response message comprises a second indication field and identification information of the first HARQ-ACK codebook, the second indication field is used for indicating whether to carry the first HARQ-ACK codebook in the uplink resource, a new field with the response message is added in the second DCI, or an original field in the second DCI is used by an indication meaning for the response message,
wherein there is a correspondence between the identification information of each HARQ-ACK codebook and the codebook number of the HARQ-ACK; or
the response message comprises a K bits carrying-identified bitmap, K represents a maximum number of HARQ-ACK codebooks for broadcast/multicast, in response to a value of a bit being a first preset value, a corresponding HARQ-ACK codebook is carried, and in response to the value of the bit being a second preset value, no corresponding HARQ-ACK codebook is carried.

4. The method of claim 1 , further comprising:
obtaining configuration information of the preset window predefined by a protocol; or
receiving the configuration information of the preset window transmitted by the base station through higher layer signaling, and the configuration information comprises a start reference position, a start position offset of the preset window and a length of the preset window.

5. The method of claim 1 , wherein in response to the first HARQ-ACK codebook corresponding to the broadcast/multicast scheduling signaling is multiplexed on the uplink resource corresponding to the unicast, an order, in the uplink resource, of the first HARQ-ACK codebook and a second HARQ-ACK codebook that is already in the uplink resource satisfies at least one of:
the second HARQ-ACK codebook is appended to the first HARQ-ACK codebook; or
the first HARQ-ACK codebook is appended to the second HARQ-ACK codebook, or
the first HARQ-ACK codebook and the second HARQ-ACK codebook are arranged in a sequential order of the PUCCH resource corresponding to the first HARQ-ACK codebook before multiplexing and the PUCCH resource corresponding to the second HARQ-ACK codebook; or
the first HARQ-ACK codebook and the second HARQ-ACK codebook arranged in a receiving order of the broadcast/multicast scheduling signaling and the unicast scheduling signaling.

6. The method of claim 1 , wherein in response to the number of the broadcast/multicast scheduling signaling being two or more, and two or more first HARQ-ACK codebooks corresponding to the two or more broadcast/multicast scheduling signaling are multiplexed on the uplink resources, the two or more first HARQ-ACK codebooks are arranged in the uplink resources in an order as follows:
the two or more first HARQ-ACK codebooks are arranged in a sequential order of a first HARQ-ACK feedback time indicated by each broadcast/multicast scheduling signaling, wherein the two or more first HARQ-ACK codebooks are arranged in an ascending order of numbers of carriers in response to the first HARQ-ACK feedback times indicated by the two or more broadcast/multicast scheduling signaling being the same, and the two or more first HARQ-ACK codebooks are arranged in an ascending order of indexes of broadcast/multicast services in response to the first HARQ-ACK feedback times indicated by the two or more broadcast/multicast scheduling signaling being the same and the numbers of carriers being the same; or
the two or more first HARQ-ACK codebooks are arranged in an index order of the first HARQ-ACK codebooks indicated by each broadcast/multicast scheduling signaling.

7. The method of claim 1 , further comprising: in response to detecting that the HARQ-ACK feedback slot indicated by the broadcast/multicast scheduling signaling and a slot where the uplink resource is located do not both exist in the preset window,
skipping feeding back HARQ-ACK information indicated by the broadcast/multicast scheduling signaling, or
feeding back HARQ-ACK information on a PUCCH resource indicated by the broadcast/multicast scheduling signaling.

8. The method of claim 1 , wherein in response to the number of uplin

Assignees

• Datang mobile communications equipment co ltd

Inventors

• Wang Junwei
• Zhao Rui

Classifications

• H04W72/12

  Wireless traffic scheduling · CPC title

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04L5/0094

  Indication of how sub-channels of the path are allocated · CPC title

• H04L5/0055

  Physical resource allocation for ACK/NACK (for physical mapping arrangements in ARQ protocols H04L1/1861) · CPC title

• H04L1/1854

  Scheduling and prioritising arrangements · CPC title