Granted Patent B2

US 12,349,113 · App. 17/439,772 · Granted Jul 1, 2025

Inventors: Zhibin Wu (Los Altos, CA); Chunxuan Ye (San Diego, CA); Haitong Sun (Cupertino, CA); Yuqin Chen (Beijing, CN); Haijing Hu (Los Gatos, CA); Wei Zeng (Saratoga, CA); Srirang A. Lovlekar (Fremont, CA); Sethuraman Gurumoorthy (San Ramon, CA); Naveen Kumar R. Palle Venkata (San Diego, CA); Adesh Kumar (San Jose, CA); Dawei Zhang (Saratoga, CA)

Assignee: Apple Inc.

H04W72/0446H04W52/0225H04W72/25H04W76/28

Abstract

Claims (72)

1. A user equipment (UE) system comprising:

a transceiver; and

a processor coupled to the transceiver, configured to:

determine a set of candidate slots that have been sensed over a plurality of sensed periods of a history window, wherein a sensed period of the plurality of sensed periods corresponds to a sidelink discontinuous reception (SL-DRX) Active Time duration that exceeds an SL-DRX ON Duration, and wherein the plurality of sensed periods is less than a plurality of periods of the history window;

determine a subset of candidate slots from the set of candidate slots based at least on an occupancy threshold;

select a first candidate slot from the subset of candidate slots; and

transmit via the transceiver, a first signal via the first candidate slot.

2. The UE of claim 1 , wherein a plurality of SL-DRX Active Time durations including the SL-DRX Active Time duration corresponds to a static gap pattern over the history window.

3. The UE of claim 1 , wherein to determine the set of candidate slots of a number of slots that have been sensed, the processor is configured to:

detect at least q sensed periods including the sensed period of the plurality of sensed periods, wherein the set of candidate slots correspond to a selection window over the q sensed periods, wherein q is an integer less than or equal to p,

wherein p is an integer corresponding to a maximum number of sensed periods of the history window that are evaluated to detect the at least q sensed periods.

4. The UE of claim 1 , wherein to determine the set of candidate slots, the processor is configured to:

monitor a Physical Sidelink Control Channel (PSCCH) during the SL-DRX Active Time duration; and

determine candidate slots of the set of candidate slots associated with the PSCCH based at least on a projection of a selection window applied to measurements corresponding to the monitoring.

5. The UE of claim 3 , wherein the processor is further configured to: determine the selection window based on a packet delay budget of a packet corresponding to the first signal.

6. The UE of claim 1 , wherein the processor is further configured to:

wherein a SL-DRX cycle comprises the SL-DRX ON Duration and an SL-DRX SLEEP Duration, align a duration of the SL-DRX cycle with the sensed period of the plurality of sensed periods of the history window.

7. The UE of claim 1 , wherein to select the first candidate slot, the processor is configured to randomly select the first candidate slot of the subset of candidate slots.

8. The UE of claim 1 , wherein to determine the set of candidate slots that are sensed, the processor is further configured to:

determine a sum of actual SL-DRX SLEEP times over the history window;

determine an actual sleep ratio comprising: the sum of the actual SL-DRX SLEEP times divided by the history window;

determine that the actual sleep ratio satisfies a sleep ratio threshold;

based on the sleep ratio threshold being satisfied, randomly select a second candidate slot from a selection window; and

transmit via the transceiver, a second signal via the second candidate slot.

9. The UE of claim 1 , wherein to determine the set of candidate slots, the processor is configured to:

determine, for the first candidate slot of the subset of candidate slots, that a corresponding occupancy level over the history window satisfies the occupancy threshold.

10. The UE of claim 1 , wherein the processor is further configured to:

establish a sidelink (SL) configuration with a peer UE, wherein the peer UE performs full sensing;

discontinue determining the set of candidate slots that are sensed over the history window;

receive, via the transceiver, during the SL-DRX ON Duration, SL sensed measurements from the peer UE;

determine based at least on the SL sensed measurements, a positive candidate list;

select a second candidate slot from the positive candidate list; and

transmit via the transceiver, a second signal via the second candidate slot.

11. The UE of claim 10 , wherein the processor is further configured to:

transmit a radio resource control (RRC) signal to the peer UE soliciting the SL sensed measurements of the peer UE.

12. The UE of claim 10 , wherein the processor is further configured to:

establish a second SL connection with a pedestrian-UE (P-UE);

determine the second candidate slot based on the second SL connection that conflicts with the positive candidate list; and

exclude the second candidate slot from the positive candidate list.

13. The UE of claim 10 , wherein the processor is further configured to:

establish a second SL connection with a pedestrian-UE (P-UE), wherein the P-UE and the UE comprise a group; and

transmit the SL sensed measurements to the P-UE, wherein the P-UE does not perform sensing for candidate slots.

14. The UE of claim 10 , wherein the peer UE comprises: a vehicle UE (V-UE) or a road side unit (RSU).

15. A method for a user equipment (UE) system comprising:

determining a set of candidate slots of a number of slots that have been sensed over a plurality of sensed periods of a history window, wherein a sensed period of the plurality of sensed periods corresponds to a sidelink discontinuous reception (SL-DRX) Active Time duration that exceeds an SL-DRX ON Duration, and wherein the plurality of sensed periods is less than a plurality of periods of the history window;

determining a subset of candidate slots from the set of candidate slots based at least on an occupancy threshold;

selecting a first candidate slot from the subset of candidate slots; and

transmitting a first signal via the first candidate slot.

16. The method of claim 15 , wherein the determining the set of candidate slots of the number of slots that have been sensed comprises:

detecting at least q sensed periods including the sensed period of the plurality of sensed periods, wherein the set of candidate slots correspond to a selection window over the at least q sensed periods, wherein q is an integer greater than or equal to p,

wherein p is an integer corresponding to a maximum number of sensed periods of the history window that are evaluated to detect the at least q sensed periods.

17. The method of claim 15 , wherein the determining the set of candidate slots further comprises:

monitoring a Physical Sidelink Control Channel (PSCCH) during the SL-DRX Active Time duration; and

determining candidate slots of the set of candidate slots associated with the PSCCH based at least on a projection of a selection window applied to measurements corresponding to the monitoring.

18. The method of claim 15 , further comprising:

determining a sum of actual SL-DRX SLEEP times over the history window;

determining an actual sleep ratio comprising: the sum of the actual SL-DRX SLEEP times divided by the history window;

determining that the actual sleep ratio satisfies a sleep ratio threshold;

based on the sleep ratio threshold being satisfied, randomly selecting a second TX slot from a selection window; and

transmitting via a transceiver, a second signal via the second TX slot.

19. The method of claim 16 , further comprising:

establishing a sidelink (SL) configuration with a peer UE, wherein the peer UE performs full sensing;

discontinuing detecting the at least q sensed periods;

receiving via a transceiver, during the SL-DRX ON Duration, SL sensed measurements from the peer UE;

determining based at least on the SL sensed measurements, a positive candidate list;

selecting a second candidate slot from the positive candidate list; and

transmitting via the transceiver, a second signal via the second candidate slot.

20. A non-transitory computer-readable medium storing instructions that, when executed by a processor of a user equipment (UE), cause the UE to perform operations, the operations comprising:

determining a set of candidate slots that have been sensed over a plurality of sensed periods of a history window, wherein a sensed period of the plurality of sensed periods corresponds to a sidelink discontinuous reception (SL-DRX) Active Time duration that exceeds an SL-DRX ON Duration, and wherein the plurality of sensed periods is less than a plurality of periods of the history window;

determining a subset of candidate slots of the set of candidate slots based at least on an occupancy threshold over the history window;

selecting a first candidate slot from the subset of candidate slots; and

transmitting a first signal via the first candidate slot.

Assignments (1)

Continuity (1)

References Cited (22)