Method and apparatus for handling sidelink and uplink HARQ-ACK feedback in a wireless communication system

Patent metadata

Field	Value
Publication number	US-10993141-B2
Application number	US-202016796665-A
Country	US
Kind code	B2
Filing date	Feb 20, 2020
Priority date	Feb 20, 2019
Publication date	Apr 27, 2021
Grant date	Apr 27, 2021

Abstract

A method and apparatus are disclosed. In an example from the perspective of a first device, the first device is configured with a second set of slot offsets by a network. The first device receives, from the network, a second Downlink Control Information (DCI) scheduling a sidelink resource. The first device performs sidelink transmission, to a second device, on the sidelink resource. The first device monitors and/or receives a sidelink hybrid automatic repeat request-acknowledgement (SL HARQ-ACK) feedback from the second device in a fourth slot. The SL HARQ-ACK feedback is associated with the sidelink transmission. The first device derives, based on the fourth slot and a second slot offset value indicated by the second DCI, a third slot for transmitting a SL HARQ-ACK to the network. The second set of slot offsets includes the second slot offset value. The SL HARQ-ACK is set/derived/determined based on the received SL HARQ-ACK feedback.

First claim

The invention claimed is:

1. A method of a first device, in Sidelink network scheduling mode, configured with a second set of slot offsets by a network, wherein each value in the second set of slot offsets indicates a slot offset from a slot for receiving sidelink hybrid automatic repeat request-acknowledgement (SL HARQ-ACK) feedback corresponding to a sidelink transmission to a slot for transmitting to the network at least one SL HARQ-ACK that is at least one of set, derived or determined, the method comprising:
receiving, from the network, a second Downlink Control Information (DCI) scheduling a sidelink resource;
performing a sidelink transmission, to a second device, on the sidelink resource;
monitoring or receiving a SL HARQ-ACK feedback from the second device in a fourth slot, wherein the SL HARQ-ACK feedback is associated with the sidelink transmission to the second device; and
deriving, based on the fourth slot and a second slot offset value indicated by the second DCI, a third slot for transmitting a SL HARQ-ACK to the network, wherein the second set of slot offsets comprises the second slot offset value, and wherein the SL HARQ-ACK is at least one of set, derived or determined based on the received SL HARQ-ACK feedback.

2. The method of claim 1 , wherein:
the second DCI is indicative of a value of a second counter Downlink Assignment Index (DAI); and
the second counter DAI corresponds to a count of one or more DCIs that schedule one or more sidelink resources and that are indicative of the third slot.

3. The method of claim 1 , comprising:
receiving, from the network, one or more second DCIs scheduling one or more sidelink resources; and
performing one or more sidelink transmissions on the one or more sidelink resources, wherein the one or more second DCIs are indicative of the third slot for transmitting one or more SL HARQ-ACKs to the network, and wherein the one or more SL HARQ-ACKs have a second number of SL HARQ-ACK bits and are associated with the one or more sidelink transmissions.

4. The method of claim 3 , wherein:
the receiving the one or more second DCIs comprises the receiving the second DCI; and
the performing the one or more sidelink transmissions comprises the performing the sidelink transmission to the second device.

5. The method of claim 3 , wherein:
each DCI of the one or more second DCIs is indicative of a value of a second counter Downlink Assignment Index (DAI); and
the second counter DAI corresponds to a count of one or more DCIs that schedule one or more sidelink resources and that are indicative of the third slot for transmitting one or more SL HARQ-ACKs to the network.

6. The method of claim 5 , comprising:
deriving the second number of SL HARQ-ACK bits based on at least one of:
the second counter DAI; or
an indication, of a value of the second counter DAI, in a last received DCI of the one or more second DCIs.

7. The method of claim 3 , comprising:
deriving the second number of SL HARQ-ACK bits based on a cardinality of the second set of slot offsets.

8. The method of claim 3 , comprising at least one of:
transmitting the one or more SL HARQ-ACKs in an uplink resource in the third slot; or
deriving the uplink resource based on a last received DCI of the one or more second DCIs.

9. The method of claim 1 , comprising:
receiving a first DCI scheduling a Physical Downlink Shared Channel (PDSCH), wherein the first DCI is indicative of a first slot offset value; and
deriving a first slot for transmitting hybrid automatic repeat request-acknowledgement (HARQ-ACK) associated with the PDSCH based on the first slot offset value.

10. The method of claim 9 , wherein at least one of:
the first device is configured with a first set of slot offsets by the network; or
the first set of slot offsets comprises the first slot offset value.

11. The method of claim 9 , wherein:
the receiving the first DCI is performed in a second slot; and
the deriving the first slot is performed based on the second slot.

12. The method of claim 9 , wherein
the first DCI is indicative of a value of a first counter Downlink Assignment Index (DAI); and
the first counter DAI corresponds to a count of one or more DCIs that schedule one or more PDSCHs and that are indicative of the first slot.

13. The method of claim 9 , comprising:
receiving, from the network, one or more first DCIs scheduling one or more PDSCHs, wherein the one or more first DCIs are indicative of the first slot for transmitting one or more HARQ-ACKs to the network, and wherein the one or more HARQ-ACKs have a first number of HARQ-ACK bits and are associated with the one or more PDSCHs.

14. The method of claim 13 , wherein:
the receiving the one or more first DCIs comprises the receiving the first DCI.

15. The method of claim 13 , wherein:
each DCI of the one or more first DCIs is indicative of a value of a first counter Downlink Assignment Index (DAI); and
the first counter DAI corresponds to a count of one or more DCIs that schedule one or more PDSCHs and that are indicative of the first slot.

16. The method of claim 15 , comprising:
deriving the first number of HARQ-ACK bits based on at least one of:
at least one of the first counter DAI or a cardinality of the first set of slot offsets; or
at least one of the cardinality of the first set of slot offsets or an indication, of a value of the first counter DAI, in a last received DCI of the one or more first DCIs.

17. The method of claim 9 , wherein:
the first DCI is indicative of a value of a first counter Downlink Assignment Index (DAI); and
at least one of:
the first counter DAI corresponds to a count of one or more DCIs that schedule one or more PDSCHs and that are indicative of the first slot wherein:
the second DCI is indicative of a value of a second counter DAI;
the second counter DAI corresponds to a count of one or more DCIs that schedule one or more sidelink resources and are indicative of the third slot; and
the first counter DAI and the second counter DAI are counted independently; or

the first slot is the same as the third slot and the first counter DAI corresponds to a count of one or more DCIs that at least one of:
schedule one or more sidelink resources and are indicative of the third slot; or
schedule one or more PDSCHs and are indicative of the third slot.

18. The method of claim 6 , wherein:
the second number of SL HARQ-ACK bits corresponds to one bit if the one or more second DCIs comprises merely the second DCI and a value of the second counter DAI, indicated by the second DCI, is one.

19. The method of claim 5 , wherein:
the second number of SL HARQ-ACK bits corresponds to a cardinality of the second set of slot offsets or a value of the second counter DAI if at least one of the one or more second DCIs comprise more than one DCI or a value of the second counter DAI, indicated by the second DCI, is greater than one.

20. The method of claim 13 , wherein the first slot is the same as the third slot, the method comprising:
receiving, from the network, one or more second DCIs scheduling one or more sidelink resources;
performing one or more sidelink transmissions on the one or more sidelink resources, wherein the one or more second DCIs are indicative of the third slot for transmitting one or more SL HARQ-ACKs to the network, wherein the one or more SL HARQ-ACKs have a second number of SL HARQ-ACK bits and are associated with the one or more sidelink transmissions;
generating an Uplink Control Infor

Assignees

• Asustek Comp Inc

Inventors

• Huang Chun-Wei
• Li Ming-Che

Classifications

• H04W72/23 Primary

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

• H04W72/25

  between terminals via a wireless link, e.g. sidelink · CPC title

• H04W72/232

  the control data signalling from the physical layer, e.g. DCI signalling · CPC title

• H04L1/1896

  ARQ related signaling · CPC title

• H04L1/1893

  Physical mapping arrangements (physical resource mapping in general H04L5/00) · CPC title