IP Library › Granted Patent US 12,689,473

Granted Patent B2

US 12,689,473 · App. 18/262,857 · Granted Jul 21, 2026

Hybrid automatic repeat request feedback for groupcast

Inventors: Berthold Panzner (Munich, DE); Nuno Manuel Kiilerich Pratas (Aalborg, DK); Lianghai Ji (Aalborg, DK); Faranaz Sabouri-Sichani (Aalborg, DK)

Assignee: NOKIA TECHNOLOGIES OY

H04L1/1864 H04L1/1812

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Quick Facts

Patent No.: US 12,689,473
App. No.: 18/262,857
Granted: Jul 21, 2026
Kind: B2

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Abstract

There is provided receiving, by a receiver wireless device, a groupcast, from a transmitter wireless device of the groupcast, determining by the receiver wireless device, at least one trigger for requesting to modify Hybrid Automatic Repeat Request, HARQ, feedback, transmitting, by the receiver wireless device to one or more peer receiver wireless devices of the groupcast, based on the determined at least one trigger, at least one request to modify the HARQ feedback to the groupcast.

Claims (83)

1 . A method comprising:

receiving, by a receiver wireless device, a groupcast, from a transmitter wireless device of the groupcast;

determining, by the receiver wireless device, at least one trigger for requesting one or more peer receiver wireless devices of the groupcast to modify a Hybrid Automatic Repeat Request (HARQ) feedback to the groupcast;

transmitting, by the receiver wireless device, based on the at least one trigger determined, at least one request to the one or more peer receiver wireless devices to transmit a modified HARQ feedback to the transmitter wireless device of the groupcast, wherein the at least one request-comprises information elements for configuring the modified HARQ feedback, the information elements comprising:

a number of consecutive transmissions of the modified HARQ feedback, sl-NrofFakeNACKs-rxx;

a maximum number of accumulated transmissions of the modified HARQ feedback desired, sl-MaxTotalNrofFakeNACKs-rXX;

a threshold for logical channel priority, sl-FakeNACKpriority-rxx;

a flag for disabling or enabling the modified HARQ feedback, sl-FakeNACK-rxx;

one or more link identifiers for transmitting the modified HARQ feedback, sl-FakeNACKLinkIDList; and

one or more identifiers of the one or more peer receiver wireless devices for the at least one request to transmit the modified HARQ feedback, sl-FakeNACKpeerUEIDList;

monitoring, by the receiver wireless device, the modified HARQ feedback transmitted by the one or more peer receiver wireless devices that have accepted to transmit the modified HARQ feedback;

based on the monitoring, determining, by the receiver wireless device, that the modified HARQ feedback is transmitted by a peer receiver wireless device of the one or more peer receiver wireless devices that have accepted to transmit the modified HARQ feedback;

reselecting, by the receiver wireless device, in response to determining that the modified HARQ feedback was not transmitted, one or more further peer receiver wireless devices of the groupcast for transmitting the modified HARQ feedback; and

disabling, by the receiver wireless device, transmissions of the modified HARQ feedback, based at least on:

an expiry of a timer for the modified HARQ feedback,

a number of transmitted modified HARQ feedbacks reaching a limit defined by at least one of the number of consecutive transmissions of the modified HARQ feedback or the maximum number of accumulated transmissions of the modified HARQ feedback, and

improved radio conditions between the transmitter wireless device and the receiver wireless device.

2 . The method of claim 1 , further comprising:

monitoring, by the receiver wireless device, one or more triggers for requesting the one or more peer receiver wireless devices of the groupcast to modify the HARQ feedback; and

transmitting, by the receiver wireless device, the at least one request to the one or more peer receiver wireless devices to transmit the modified HARQ feedback to the transmitter wireless device of the groupcast based on detecting the at least one trigger of the one or more triggers.

3 . The method of claim 2 , further comprising:

receiving, by the receiver wireless device, one or more responses to the at least one request, the one or more responses indicating acceptance to transmit the modified HARQ feedback.

4 . The method of claim 3 , wherein the groupcast is sidelink communications.

5 . The method of claim 4 , wherein the at least one request to modify the HARQ feedback to the groupcast is a sidelink broadcast message, a sidelink groupcast message or a sidelink unicast message.

6 . The method of claim 5 , wherein the HARQ feedback is NACK-only feedback.

7 . The method of claim 6 , wherein the at least one request is a sidelink radio resource Control (RRC) protocol message or a sidelink Medium Access Control protocol (MAC) Control Element (CE).

8 . An apparatus comprising:

a processor; and

a memory comprising computer-executable instructions that, when executed by the processor, cause the apparatus to perform the following operations:

receiving a groupcast from a transmitter wireless device of the groupcast;

determining at least one trigger for requesting one or more peer receiver wireless devices of the groupcast to modify a Hybrid Automatic Repeat Request (HARQ) feedback to the groupcast;

transmitting, based on the at least one trigger determined, at least one request to the one or more peer receiver wireless devices to transmit a modified HARQ feedback to the transmitter wireless device of the groupcast, wherein the at least one request comprises information elements for configuring the modified HARQ feedback, the information elements comprising:

a number of consecutive transmissions of the modified HARQ feedback, sl-NrofFakeNACKs-rxx;

a maximum number of accumulated transmissions of the modified HARQ feedback desired, sl-MaxTotalNrofFakeNACKs-rXX;

a threshold for logical channel priority, sl-FakeNACKpriority-rxx;

a flag for disabling or enabling the modified HARQ feedback, sl-FakeNACK-rxx;

one or more link identifiers for transmitting the modified HARQ feedback, sl-FakeNACKLinkIDList; and

one or more identifiers of the one or more peer receiver wireless devices for the at least one request to the modified HARQ feedback, sl-FakeNACKpeerUEIDList;

monitoring the modified HARQ feedback transmitted by the one or more peer receiver wireless devices that have accepted to transmit the modified HARQ feedback;

based on the monitoring, determining, that the modified HARQ feedback is transmitted by a peer receiver wireless device of the one or more peer receiver wireless devices that have accepted to transmit the modified HARQ feedback;

reselecting, in response to determining that the modified HARQ feedback was not transmitted, one or more further peer receiver wireless devices of the groupcast for transmitting the modified HARQ feedback; and

disabling transmissions of the modified HARQ feedback, based at least on:

an expiry of a timer for the modified HARQ feedback,

improved radio conditions between the transmitter wireless device and a receiver wireless device.

9 . The apparatus of claim 8 , wherein the computer-executable instructions, when executed by the processor, further cause the apparatus to perform the following operations:

monitoring one or more triggers for requesting the one or more peer receiver wireless devices of the groupcast to modify the HARQ feedback; and

transmitting the at least one request to the one or more peer receiver wireless devices to transmit the modified HARQ feedback to the transmitter wireless device of the groupcast based on detecting the at least one trigger of the one or more triggers.

10 . The apparatus of claim 9 , wherein the computer-executable instructions, when executed by the processor, further cause the apparatus to perform the following operations:

receiving one or more responses to the at least one request, the one or more responses indicating acceptance to transmit the modified HARQ feedback.

11 . The apparatus of claim 10 , wherein the groupcast is sidelink communications.

12 . The apparatus of claim 11 , wherein the at least one request to modify the HARQ feedback to the groupcast is a sidelink broadcast message, a sidelink groupcast message or a sidelink unicast message.

13 . The apparatus of claim 12 , wherein the HARQ feedback is NACK-only feedback.

14 . The apparatus of claim 13 , wherein the at least one request is a sidelink radio resource Control (RRC) protocol message or a sidelink Medium Access Control protocol (MAC) Control Element (CE).

15 . A system comprising:

an apparatus;