IP Library › Granted Patent US 12665707

Granted Patent B2

US 12665707 · App. 17/378,502 · Granted Jun 23, 2026

Resource collision indication using feedback

Inventors: Gabi Sarkis (San Diego, CA); Tien Viet Nguyen (Bridgewater, NJ); Souriya Dutta (San Diego, CA); Shuanshuan Wu (San Diego, CA); Kapil Gulati (Belle Mead, NJ)

Assignee: QUALCOMM Incorporated

H04L1/1896 H04W72/0446 H04W72/0453 H04W72/1263 H04W72/20 H04W72/56 H04W92/18

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Quick Facts

Patent No.: US 12665707
App. No.: 17/378,502
Granted: Jun 23, 2026
Kind: B2

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Abstract

Methods, systems, and devices for wireless communications are described. Some wireless communications system may support sidelink communications between one or more sidelink user equipment (UE). A sidelink UE may receive control signaling such as sidelink control information that indicates a set of resources available for reservation by the UE from a sidelink resource pool. Based on decoding the sidelink control information, the UE may determine that a resource overlap is to occur between scheduled transmissions in a sidelink resource. Upon identifying the resource overlap, the UE may transmit a message such as a negative acknowledgement message. By transmitting the message, the UE may prompt retransmission from one or more UEs involved in the resource overlap, which may reduce latency and increase reliability for sidelink data in the wireless communications system.

Claims (76)

1 . An apparatus for wireless communications at a first user equipment (UE), comprising:

one or more processors, and

one or more memories coupled with the one or more processors, the one or more processors and the one or more memories configured to:

receive sidelink control information from a second UE via a sidelink control channel, the sidelink control information indicating a first sidelink resource reserved for a first sidelink transmission by the second UE; and

transmit, via a sidelink feedback channel, a message indicative of a resource overlap between the first sidelink resource reserved for the first sidelink transmission and a second sidelink resource reserved for a second sidelink transmission, the message including a same base sequence used by the first UE for an acknowledgement message, wherein the message differs from the acknowledgement message based at least in part on application of different cyclic shifts.

2 . The apparatus of claim 1 , wherein to transmit the message indicative of the resource overlap, the one or more processors and the one or more memories are configured to:

transmit the message indicative of the resource overlap on the sidelink feedback channel based at least in part on the first UE being of a category of UEs designated to provide an indication of the resource overlap.

3 . The apparatus of claim 1 , wherein to transmit the message indicative of the resource overlap, the one or more processors and the one or more memories are configured to:

receive, in the sidelink control information, a destination identifier indicating a recipient of the first sidelink transmission and the second sidelink transmission;

compare the destination identifier to an identifier of the first UE;

determine that the first UE is an intended recipient of at least one of the first sidelink transmission or the second sidelink transmission; and

transmit the message indicative of the resource overlap based at least in part on a category of UEs including intended recipients of at least one of the first sidelink transmission or the second sidelink transmission resulting in the resource overlap.

4 . The apparatus of claim 1 , wherein to transmit the message indicative of the resource overlap, the one or more processors and the one or more memories are configured to:

transmit the message indicative of the resource overlap based at least in part on a category of UEs including UEs that are intended recipients of at least one of the first sidelink transmission or the second sidelink transmission resulting in the resource overlap and other UEs.

5 . The apparatus of claim 1 , wherein to transmit the message indicative of the resource overlap, the one or more processors and the one or more memories are configured to:

transmit the message indicative of the resource overlap based at least in part on the first UE being of a category of UEs including UEs that are designated via a configuration to provide the message indicative of the resource overlap.

6 . The apparatus of claim 1 , wherein the one or more processors and the one or more memories are further configured to:

receive a retransmission of at least one of the first sidelink transmission or the second sidelink transmission based at least in part on transmitting the message indicative of the resource overlap.

7 . The apparatus of claim 1 , wherein to transmit the message indicative of the resource overlap, the one or more processors and the one or more memories are configured to:

determine, based at least in part on the sidelink control information, that the resource overlap between the first sidelink resource and the second sidelink resource is to occur at a future time; and

transmit the message indicative of the resource overlap based at least in part on the determination.

8 . The apparatus of claim 1 , wherein the resource overlap comprises a time overlap, a frequency overlap, or both.

9 . The apparatus of claim 1 , wherein to transmit the message indicative of the resource overlap, the one or more processors and the one or more memories are configured to:

identify a metric associated with system congestion of the sidelink control channel;

compare the metric to a threshold system congestion; and

transmit the message indicative of the resource overlap to one or more UEs based at least in part on the metric being less than the threshold system congestion.

10 . The apparatus of claim 9 , wherein the metric comprises a channel occupation ratio (CR), a channel busy ratio (CBR), or both.

11 . The apparatus of claim 1 , wherein to transmit the message indicative of the resource overlap, the one or more processors and the one or more memories are configured to:

transmit the message indicative of the resource overlap based at least in part on a distance between the first UE and the second UE, a location of the first UE and the second UE, or both.

12 . The apparatus of claim 1 , wherein to transmit the message indicative of the resource overlap, the one or more processors and the one or more memories are configured to:

transmit the message indicative of the resource overlap to all UEs providing sidelink transmissions involved in the resource overlap.

13 . The apparatus of claim 1 , wherein to transmit the message indicative of the resource overlap, the one or more processors and the one or more memories are configured to:

identify a priority associated with the first sidelink transmission, the second sidelink transmission, or both;

compare the identified priority to a threshold priority; and

transmit the message indicative of the resource overlap to one or more UEs based at least in part on the identified priority satisfying the threshold priority.

14 . The apparatus of claim 1 , wherein, to transmit the message indicative of the resource overlap, the one or more processors and the one or more memories are configured to:

identify a signal power associated with the first sidelink transmission, the second sidelink transmission, or both;

compare the identified signal power to a threshold signal power; and

transmit the message indicative of the resource overlap to one or more UEs based at least in part on the identified signal power satisfying the threshold signal power.

15 . The apparatus of claim 14 , wherein the one or more processors and the one or more memories are further configured to:

determine the threshold signal power based at least in part on a reference signal received power (RSRP) measurement associated with the first sidelink transmission, the second sidelink transmission, or both.

16 . The apparatus of claim 1 , wherein, to transmit the message indicative of the resource overlap, the one or more processors and the one or more memories are configured to:

determine a set of geographic locations for one or more UEs, a location of the one or more UEs being associated with a zone identifier; and

transmit the message indicative of the resource overlap to the one or more UEs based at least in part on the zone identifier.

17 . The apparatus of claim 1 , wherein the one or more processors and the one or more memories are further configured to:

determine the resource overlap based at least in part on interference cancellation.

18 . The apparatus of claim 1 , wherein the message indicative of the resource overlap comprises a negative acknowledgement message transmitted on a sidelink feedback channel.

19 . A method for wireless communications at a first user equipment (UE), comprising:

receiving sidelink control information from a second UE via a sidelink control channel, the sidelink control information indicating a first sidelink resource reserved for a first sidelink transmission by the second UE; and

transmitting, via a sidelink feedback channel, a message indicative of a resource overlap between the first sidelink resource reserved for the first sidelink transmission and a second sidelink resource reserved for a second sidelink transmission, the message including a same base sequence used by the first UE for an acknowledgement message, wherein the message differs from the acknowledgement message based at least in part on application of different cyclic shifts.

20 . The method of claim 19 , wherein transmitting the message indicative of the resource overlap comprises:

transmitting the message indicative of the resource overlap on the sidelink feedback channel based at least in part on the first UE being of a category of UEs designated to provide an indication of the resource overlap.

21 . The method of claim 20 , wherein transmitting the message indicative of the resource overlap further comprises:

receiving, in the sidelink control information, a destination identifier indicating a recipient of the first sidelink transmission and the second sidelink transmission;

comparing the destination identifier to an identifier of the first UE;

determining that the first UE is an intended recipient of at least one of the first sidelink transmission or the second sidelink transmission; and

transmitting the message indicative of the resource overlap based at least in part on a category of UEs including intended recipients of at least one of the first sidelink transmission or the second sidelink transmission resulting in the resource overlap.

22 . The method of claim 20 , wherein transmitting the message indicative of the resource overlap further comprises:

transmitting the message indicative of the resource overlap based at least in part on a category of UEs including UEs that are intended recipients of at least one of the first sidelink transmission or the second sidelink transmission resulting in the resource overlap and other UEs.

23 . The method of claim 20 , wherein transmitting the message indicative of the resource overlap further comprises:

transmitting the message indicative of the resource overlap based at least in part on the category of UEs including UEs that are designated via a configuration to provide the message indicative of the resource overlap.

24 . The method of claim 19 , further comprising:

receiving a retransmission of at least one of the first sidelink transmission or the second sidelink transmission based at least in part on transmitting the message indicative of the resource overlap.

25 . The method of claim 19 , wherein the resource overlap comprises a time overlap, a frequency overlap, or both.

26 . The method of claim 19 , wherein transmitting the message indicative of the resource overlap comprises:

identifying a metric associated with system congestion of the sidelink control channel;

comparing the metric to a threshold system congestion; and

transmitting the message indicative of the resource overlap to one or more UEs based at least in part on the metric being less than the threshold system congestion.

27 . The method of claim 26 , the metric comprising a channel occupation ratio (CR), a channel busy ratio (CBR), or both.

28 . The method of claim 19 , wherein the message indicative of the resource overlap comprises a negative acknowledgement message transmitted on a sidelink feedback channel.

29 . An apparatus for wireless communications at a first user equipment (UE), comprising:

means for receiving sidelink control information from a second UE via a sidelink control channel, the sidelink control information indicating a first sidelink resource reserved for a first sidelink transmission by the second UE; and

means for transmitting, via a sidelink feedback channel, a message indicative of a resource overlap between the first sidelink resource reserved for the first sidelink transmission and a second sidelink resource reserved for a second sidelink transmission, the message including a same base sequence used by the first UE for an acknowledgement message, wherein the message differs from the acknowledgement message based at least in part on application of different cyclic shifts.

30 . A non-transitory computer-readable medium storing code for wireless communications at a first user equipment (UE), the code comprising instructions executable by one or more processors to: