Methods of HARQ codebook determination for low latency communications

Patent metadata

Field	Value
Publication number	US-12471083-B2
Application number	US-202017431240-A
Country	US
Kind code	B2
Filing date	Feb 13, 2020
Priority date	Feb 15, 2019
Publication date	Nov 11, 2025
Grant date	Nov 11, 2025

Abstract

According to certain embodiments, a method performed by a wireless device includes receiving, from a network node, downlink control information (DCI). The method also includes determining, based on the DCI, a first group of downlink channel sub-slots for downlink channel transmissions. The first group of downlink channel sub-slots corresponds to a group of uplink channel sub-slots and is associated with one or more uplink resources in the corresponding group of uplink channel sub-slots. The method additionally includes constructing a first HARQ codebook comprising acknowledgment (ACK) and/or negative acknowledgement (NACK) feedback for the downlink channel transmissions scheduled in the first group of downlink channel sub-slots. The method further includes transmitting the ACK and/or NACK feedback, using the one or more uplink resources, according to the first HARQ codebook.

First claim

What is claimed is:

1 . A method performed by a wireless device, the method comprising:
receiving, from a network node, downlink control information (DCI); determining, based on the DCI, a first group of downlink channel sub-slots for downlink channel transmissions, the first group of downlink channel sub-slots corresponding to a group of uplink channel sub-slots and associated with one or more uplink resources in the group of uplink channel sub-slots, wherein the DCI schedules downlink transmissions in the first group of downlink channel sub-slots and each sub-slot of the first group is associated with its own DCI; determining the one or more uplink resources based at least in part on a DCI associated with the last scheduled sub-slot of the first group of downlink channel sub-slots; constructing a first hybrid automatic repeat request (HARQ) codebook comprising at least one of acknowledgment (ACK) and negative acknowledgement (NACK) feedback for the downlink channel transmissions scheduled in the first group of downlink channel sub-slots; and transmitting the at least one of the ACK and NACK feedback, using the one or more uplink resources, according to the first HARQ codebook.

2 . The method of claim 1 , wherein the first group of downlink channel sub-slots comprises more than a downlink channel slot.

3 . The method of claim 1 , wherein different physical downlink shared channels (PDSCHs) belong to the first group of downlink channel sub-slots.

4 . The method of claim 1 , wherein the one or more uplink resources comprise physical uplink control channel (PUCCH) resources.

5 . The method of claim 1 , further comprising:
receiving, from the network node, additional DCI; determining, based on the additional DCI, a second group of downlink channel sub-slots for downlink channel transmissions, the second group of downlink channel sub-slots corresponding to a second group of uplink channel sub-slots and associated with one or more uplink resources in the second group of uplink channel sub-slots; constructing a second HARQ codebook comprising at least one of ACK and NACK feedback for the downlink channel transmissions scheduled in the second group of downlink channel sub-slots; and transmitting the at least one of the ACK and NACK feedback, using the one or more uplink resources associated with the second group of downlink channel sub-slots, according to the second HARQ codebook.

6 . The method of claim 5 , wherein the first group of downlink channel sub-slots and the second group of downlink channel sub-slots correspond to the same downlink slot and the one or more uplink resources of the first HARQ codebook are different than the one or more uplink resources of the second HARQ codebook.

7 . The method of claim 1 , wherein the first group of downlink channel sub-slots is determined from a plurality of groups of downlink channel sub-slots, each group of downlink channel sub-slots associated with a respective group of sub-slots of downlink slots.

8 . The method of claim 1 , wherein the DCI associated with the last scheduled sub-slot of the first group is a most recently received DCI.

9 . The method of claim 8 , wherein the one or more uplink resources comprise PUCCH resources indicated by an acknowledgement resource indicator (ARI) field in the latest DCI.

10 . A wireless device, the wireless device comprising:
power supply circuitry configured to supply power to the wireless device; and processing circuitry configured to: receive, from a network node, downlink control information (DCI); determine, based on the DCI, a first group of downlink channel sub-slots for downlink channel transmissions, the first group of downlink channel sub-slots corresponding to a group of uplink channel sub-slots and associated with one or more uplink resources in the group of uplink channel sub-slots based on a position of the downlink channel sub-slots within a slot, wherein the DCI schedules downlink transmissions in the first group of downlink channel sub-slots and each sub-slot of the first group is associated with its own DCI; determine the one or more uplink resources based at least in part on a DCI associated with the last scheduled sub-slot of the first group of downlink channel sub-slots; construct a first hybrid automatic repeat request (HARQ) codebook comprising at least one of acknowledgement (ACK) and negative acknowledgements (NACK) feedback for the downlink channel transmissions scheduled in the first group of downlink channel sub-slots; and transmit the at least one of the ACK and NACK feedback, using the one or more uplink resources, according to the first HARQ codebook.

11 . The wireless device of claim 10 , wherein the first group of downlink channel sub-slots comprises less than a downlink channel slot.

12 . The wireless device of claim 10 , wherein different physical downlink shared channels (PDSCHs) belong to the first group of downlink channel sub-slots.

13 . The wireless device of claim 10 , wherein the one or more uplink resources comprise physical uplink control channel (PUCCH) resources.

14 . The wireless device of claim 10 , wherein the processing circuitry is further configured to:
receive, from the network node, additional DCI; determine, based on the additional DCI, a second group of downlink channel sub-slots for downlink channel transmissions, the second group of downlink channel sub-slots corresponding to a second group of uplink channel sub-slots and associated with one or more uplink resources in the second group of uplink channel sub-slots; construct a second HARQ codebook comprising at least one of ACK and NACK feedback for the downlink channel transmissions scheduled in the second group of downlink channel sub-slots; and transmit the at least one of ACK and NACK feedback, using the one or more uplink resources associated with the second group of downlink channel sub-slots, according to the second HARQ codebook.

15 . The wireless device of claim 14 , wherein the first group of downlink channel sub-slots and the second group of downlink channel sub-slots correspond to the same downlink slot and the one or more uplink resources of the first HARQ codebook are different than the one or more uplink resources of the second HARQ codebook.

16 . The wireless device of claim 10 , wherein the first group of downlink channel sub-slots is determined from a plurality of groups of downlink channel sub-slots, each group of downlink channel sub-slots associated with a respective group of sub-slots of downlink slots.

17 . The wireless device of claim 10 , wherein the DCI associated with the last scheduled sub-slot of the first group is a most recently received DCI.

18 . The wireless device of claim 17 , wherein the one or more uplink resources comprise PUCCH resources indicated by an acknowledgement resource indicator (ARI) field in the latest DCI.

19 . A method performed by a network node, the method comprising:
sending a wireless device downlink control information (DCI) comprising information associated with a first group of downlink channel sub-slots for downlink channel transmissions, the first group of downlink channel sub-slots corresponding to a group of uplink channel sub-slots, wherein the DCI schedules downlink transmissions in the first group of downlink channel sub-slots and each sub-slot of the first group is associated with its own DCI, determining one or more uplink resources in the group of uplink channel sub-slots, the one or more uplink resources associated with a first h

Assignees

• Ericsson Telefon Ab L M

Inventors

• Baldemair Robert
• Falahati Sorour
• Behravan Ali

Classifications

• H04W72/23

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

• H04W72/0446

  Resources in time domain, e.g. slots or frames · CPC title

• H04L5/0053

  Allocation of signalling, i.e. of overhead other than pilot signals · CPC title

• H04L1/1812

  Hybrid protocols; Hybrid automatic repeat request [HARQ] · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · CPC title