# US 12,225,579 B2 · Sensing operations for sidelink communications

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- Number: US 12,225,579 B2
- Document ID: US12225579B2
- Status: Granted
- Kind: B2
- Application number: 17/654,763
- Filed: 2022-03-14
- Published: 2022-09-29
- Granted: 2025-02-11
- Earliest claimed: 2021-03-18
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Emad N. Farag
- Web page: https://patentgrep.com/patent/US12225579B2

## CPC

- H04W 72/02: Selection of wireless resources by user or terminal
- H04W 74/0808: using carrier sensing, e.g. carrier sense multiple access [CSMA]
- H04W 72/0446: Resources in time domain, e.g. slots or frames
- H04W 72/1263: Mapping of traffic onto schedule, e.g. scheduled allocation or multiplexing of flows
- H04W 72/542: using measured or perceived quality
- H04W: WIRELESS COMMUNICATION NETWORKS (broadcast communication H04H; communication systems using wireless links for non-selective communication, e.g. wireless extensions H04M1/72)

## Abstract

Methods and apparatuses for adaptive low-power sensing operations for sidelink (SL) communications in a wireless communication system. A method of operating a user equipment (UE) includes operating with partial sensing; operating in a resource pool configured for the partial sensing; and triggering for a SL resource selection in a slot n. The method further includes selecting Y candidate slots for the SL resource selection and performing, in a sensing window, a contiguous partial sensing (CPS). A first of the selected Y candidate slots is a slot t′y0SL. The sensing window is in contiguous slots within the resource pool relative to the slot t′y0SL.

## Claims

### Claim 1

A user equipment (UE), comprising:
a transceiver; and
a processor operably coupled to the transceiver, the processor configured to:
operate with partial sensing;
operate in a resource pool configured for the partial sensing;
trigger a sidelink (SL) resource selection in a slot n;
select Y candidate slots for the SL resource selection, wherein a first of the selected Y candidate slots is a slot t′y0SL; and
perform, in a sensing window, a contiguous partial sensing (CPS), wherein:
the sensing window is in contiguous slots within the resource pool relative to the slot t′y0SL,
an end of the sensing window is Tproc,0SL+Tproc,1SL before the slot t′y0SL,
Tproc,0SL is a sensing processing latency time, and
Tproc,1SL is a resource selection processing time.

### Claim 2 (depends on 1)

The UE of claim 1, wherein a start of the sensing window is one of:
31 logical slots before the slot t′y0SL, or
a configured number of logical slots before the slot t′y0SL.

### Claim 3 (depends on 1)

The UE of claim 1, wherein a start of the sensing window is no earlier than the slot n.

### Claim 4 (depends on 1)

The UE of claim 1, wherein:
the resource pool has a parameter sl-MultiReserveResource set to enabled; and
the processor is further configured to perform periodic-based partial sensing (PBPS).

### Claim 5 (depends on 4)

The UE of claim 4, wherein the selected Y candidate slots are for the CPS and the PBPS.

### Claim 6 (depends on 4)

The UE of claim 4, wherein the processor is further configured to perform PBPS for a re-evaluation check or a pre-emption check.

### Claim 7 (depends on 1)

The UE of claim 1, wherein:
the processor is further configured to trigger a re-evaluation check or a pre-emption check in the slot n,
a slot t′yiSL replaces the slot t′y0SL, and
the slot t′yiSL is a first slot with a SL resource for a re-evaluation check or a pre-emption check after the slot n+T3, where T3 is a resource selection processing time for re-evaluation check or pre-emption check.

### Claim 8 (depends on 1)

The UE of claim 1, wherein:
the processor is further configured to determine candidate resources in a slot R, and
the slot R is the resource selection processing time, Tproc,1SL, before the slot t′y0SL.

### Claim 9 (depends on 1)

The UE of claim 1, wherein the processor is further configured to:
measure a SL channel busy ratio (CBR) over a window [m−a, m−1], where m is a slot in which the received signal strength indicator (RSSI) is measured and a is determined according to a higher layer parameter sl-TimeWindowSizeCBR, and
determine the CBR based on the RSSI measured in slots within the window, wherein partial sensing is performed and a number of the slots is X; and
use the measured CBR when X is not less than a pre-configured value.

### Claim 10

A method of operating a user equipment (UE), the method comprising:
operating with partial sensing;
operating in a resource pool configured for the partial sensing;
triggering for a sidelink (SL) resource selection in a slot n;
selecting Y candidate slots for the SL resource selection, wherein a first of the selected Y candidate slots is a slot t′y0SL; and
performing, in a sensing window, a contiguous partial sensing (CPS), wherein:
the sensing window is in contiguous slots within the resource pool relative to the slot t′y0SL,
an end of the sensing window is Tproc,0SL+Tproc,1SL before the slot t′y0SL,
Tproc,0SL is a sensing processing latency time, and
Tproc,1SL is a resource selection processing time.

### Claim 11 (depends on 10)

The method of claim 10, wherein a start of the sensing window is one of:
31 logical slots before the slot t′y0SL, or
a configured number of logic slots before the slot t′y0SL.

### Claim 12 (depends on 10)

The method of claim 10, wherein a start of the sensing window is no earlier than the slot n.

### Claim 13 (depends on 10)

The method of claim 10, wherein:
the resource pool has a parameter sl-MultiReserveResource set to enabled; and
the method further comprises performing periodic-based partial sensing (PBPS).

### Claim 14 (depends on 13)

The method of claim 13, wherein the selected Y candidate slots are for the CPS and the PBPS.

### Claim 15 (depends on 13)

The method of claim 13, further comprising performing PBPS for a re-evaluation check and a pre-emption check.

### Claim 16 (depends on 10)

The method of claim 10, further comprising:
triggering a re-evaluation check or a pre-emption check in the slot n,
wherein a slot t′yiSL replaces the slot t′y0SL, and
the slot t′yiSL is a first slot with a SL resource for a re-evaluation check or a pre-emption check after the slot n+T3, where T3 is a resource selection processing time for re-evaluation check or pre-emption check.

### Claim 17 (depends on 10)

The method of claim 10, further comprising:
determining candidate resources in a slot R,
wherein the slot R is the resource selection processing time, Tproc,1SL, before the slot t′y0SL.

### Claim 18 (depends on 10)

The method of claim 10, further comprising:
measuring a SL channel busy ratio (CBR) over a window [m−a, m−1], where m is a slot in which the received signal strength indicator (RSSI) is measured and a is determined according to a higher layer parameter sl-TimeWindowSizeCBR;
determining the CBR based on the RSSI measured in slots, within the window, wherein partial sensing is performed and a number of the slots is X; and
using the measured CBR when X is not less than a pre-configured value.