US-12628129-B2 - User equipment and resource monitoring method in sidelink communication

Abstract

A user equipment (UE) and a resource monitoring method in sidelink communication are provided. The resource monitoring method in sidelink communication by the UE includes selecting a set of candidate slots within a resource selection window of a sidelink resource pool when partial sensing is configured in the UE by a higher layer and monitoring a slot t y−k×Preserve in the sidelink resource pool for a set of P reserve and a set of k no earlier than n−T 0 , wherein a slot t y is in the set of candidate slots, the set of P reserve comprises a subset of resource reservation periodicities, the set of k corresponds to one or more periodic sensing occasions, and T 0 is a length of a sensing window.

Inventors

• Huei-Ming Lin

Assignees

• GUANGDONG OPPO MOBILE TELECOMMUNICATIONS CORP., LTD.

Dates

Publication Date

20260512

Application Date

20230626

Claims (20)

1. 1 . A resource monitoring method in sidelink communication by a user equipment (UE), comprising: selecting a set of candidate slots within a resource selection window of a sidelink resource pool when partial sensing is configured in the UE by a higher layer; and monitoring a slot t y−k×Preserve in the sidelink resource pool for a set of P reserve and a set of k no earlier than n−T 0 , wherein a slot t y is in the set of candidate slots, the set of P reserve comprises a subset of resource reservation periodicities, the set of k corresponds to one or more periodic sensing occasions, and T 0 is a length of a sensing window, and wherein the UE is triggered in slot n to determine a subset of resources for sidelink transmission.
2. 2 . The method of claim 1 , wherein when a mode 2 resource allocation procedure is triggered in a slot n to determine a subset of resources for sidelink transmission, one or more of following parameters are provided by a higher layer of the UE, and the one or more of following parameters comprise a sidelink resource pool identifier and/or index; a first layer (L1) priority for the sidelink transmission Prio Tx ; a non-zero resource reservation interval for the sidelink transmission P rsvp_Tx ; a minimum and/or maximum number of candidate slots for resource selection; a list of possible resource reservation periods allowed for the sidelink resource pool; or a sidelink discontinuous reception (DRX) active/inactive period and/or timer.
3. 3 . The method of claim 2 , wherein the set of P reserve comprises at least one value from the list of possible resource reservation periods allowed for the sidelink resource pool.
4. 4 . The method of claim 1 , wherein the set of candidate slots is bounded by a minimum and/or maximum value.
5. 5 . The method of claim 1 , wherein the set of P reserve is radio resource control (RRC) configured by a base station or pre-configured.
6. 6 . The method of claim 1 , wherein the set of k corresponds to at least most recent one or two periodic sensing occasions for a given periodicity P reserve .
7. 7 . The method of claim 1 , wherein the periodic sensing occasions are derived based on the set of candidate slots, the set of P reserve , and the set of k.
8. 8 . The method of claim 1 , wherein monitoring the slot t y−k×Preserve in the sidelink resource pool for the set of P reserve the set of k comprises monitoring sidelink resources in a subset of periodic sensing occasions when a sidelink DRX is configured.
9. 9 . The method of claim 8 , further comprising selecting only subset of periodic sensing occasions aligning with a sidelink DRX cycle.
10. 10 . The method of claim 2 , wherein the sidelink transmission comprises a physical sidelink control channel (PSCCH) and/or physical sidelink shared channel (PSSCH) transmission.
11. 11 . The method of claim 10 , wherein after determining the set of candidate slots within the resource selection window, the method further comprises resource monitoring by decoding a PSCCH and measuring a reference signal received power (RSRP) level.
12. 12 . A user equipment (UE), comprising: a memory; a transceiver; and a processor coupled to the memory and the transceiver; wherein the processor is configured to select a set of candidate slots within a resource selection window of a sidelink resource pool when partial sensing is configured in the UE by a higher layer; and wherein the processor is configured to monitor a slot t y−k×Preserve in the sidelink resource pool for a set of P reserve and a set of k no earlier than n−T 0 , wherein a slot t y is in the set of candidate slots, the set of P reserve comprises a subset of resource reservation periodicities, the set of k corresponds to one or more periodic sensing occasions, and T 0 is a length of a sensing window, and wherein the UE is triggered in slot n to determine a subset of resources for sidelink transmission.
13. 13 . The UE of claim 12 , wherein when a mode 2 resource allocation procedure is triggered in a slot n to determine a subset of resources for sidelink transmission, one or more of following parameters are provided by a higher layer of the UE, and the one or more of following parameters comprise a sidelink resource pool identifier and/or index; a first layer (L1) priority for the sidelink transmission Prio Tx ; a non-zero resource reservation interval for the sidelink transmission P rsvp_Tx ; a minimum and/or maximum number of candidate slots for resource selection; a list of possible resource reservation periods allowed for the sidelink resource pool; or a sidelink discontinuous reception (DRX) active/inactive period and/or timer.
14. 14 . The UE of claim 13 , wherein the set of P reserve comprises at least one value from the list of possible resource reservation periods allowed for the sidelink resource pool.
15. 15 . The UE of claim 12 , wherein the set of P reserve is radio resource control (RRC) configured by a base station or pre-configured.
16. 16 . The UE of claim 12 , wherein the set of k corresponds to at least most recent one or two periodic sensing occasions for a given periodicity P reserve .
17. 17 . The UE of claim 12 , wherein the periodic sensing occasions are derived based on the set of candidate slots, the set of P reserve , and the set of k.
18. 18 . The UE of claim 12 , wherein monitoring the slot t y−k×Preserve in the sidelink resource pool for the set of P reserve the set of k comprises monitoring sidelink resources in a subset of periodic sensing occasions when a sidelink DRX is configured.
19. 19 . The UE of claim 18 , wherein the processor is further configured to select only subset of periodic sensing occasions aligning with a sidelink DRX cycle.
20. 20 . A non-transitory machine-readable storage medium having stored thereon instructions that, when executed by a computer, cause the computer to: select a set of candidate slots within a resource selection window of a sidelink resource pool when partial sensing is configured in a UE by a higher layer; and monitor a slot t y−k×Preserve in the sidelink resource pool for a set of P reserve and a set of k no earlier than n−T 0 , wherein a slot t y is in the set of candidate slots, the set of P reserve comprises a subset of resource reservation periodicities, the set of k corresponds to one or more periodic sensing occasions, and T 0 is a length of a sensing window, and wherein the UE is triggered in slot n to determine a subset of resources for sidelink transmission.

Description

CROSS-REFERENCE This application is a continuation of International Patent Application No. PCT/CN2022/072587, filed Jan. 18, 2022, which claims priority to U.S. Provisional Application No. 63/139,191, filed Jan. 19, 2021, the entire disclosures of which are incorporated herein by reference. BACKGROUND OF DISCLOSURE 1. Field of the Disclosure The present disclosure relates to the field of communication systems, and more particularly, to a user equipment (UE) and a resource monitoring method in sidelink (SL) communication, which can provide a good communication performance and/or provide high reliability. 2. Description of the Related Art For an existing sidelink (SL) communication technology defined by 3GPP in Release 16, in order for a UE to select physical sidelink shared channel (PSSCH) resources for its own transmissions and to avoid collision with others (i.e., avoiding selecting resources already reserved by other UEs), the UE performs sensing in every slot of a SL resource pool for a duration of time (i.e., within a sensing window in the past) to obtain resource reservation information in physical sidelink control channel (PSCCH) transmitted from other UEs and to measure their sidelink reference signal received power (RSRP) levels, except for slots in which the UE own transmissions occur. Further, the UE continues to perform sensing in every slot after the resource selection up until the selected transmission resource occasions for re-evaluation and pre-emption checking by the UE to ensure collision free transmission. This kind of rigorous reservation monitoring and usage checking of all SL resources is commonly referred as full sensing operation. To achieve power saving for pedestrian UEs (P-UEs) with limited battery power supply, random resource selection scheme based on no sensing at all and SL resource selection based on partial sensing scheme were introduced for P2X communication in 4th generation (4G) long term evolution (LTE) version of SL technology. The common assumption of the same traffic pattern, however, can no longer hold true and it should not be used as the basis for designing a new power saving based resource allocation scheme for 5th generation (5G) new radio (NR) SL communication. Since the use of NR-SL technology targets to support wider range of applications and services other than just P2X traffic as mentioned earlier, device UEs with limited power supply may be used for public safety voice communication, AR/VR gaming, and the device UEs may start to receive and decode SL data transmitted from others to be able to in communication with one another. As such, it becomes even more important to reduce/limit power consumption for the device UEs. SUMMARY In a first aspect of the present disclosure, a user equipment (UE) includes a memory, a transceiver, and a processor coupled to the memory and the transceiver. The processor is configured to select a set of candidate slots within a resource selection window of a sidelink resource pool when partial sensing is configured in the UE by a higher layer. The processor is configured monitor a slot ty−k×Preserve in the sidelink resource pool for a set of Preserve and a set of k no earlier than n−T0, wherein a slot ty is in the set of candidate slots, the set of Preserve comprises a subset of resource reservation periodicities, the set of k corresponds to one or more periodic sensing occasions, and T0 is a length of a sensing window. In a second aspect of the present disclosure, a resource monitoring method in sidelink communication by a user equipment (UE) includes selecting a set of candidate slots within a resource selection window of a sidelink resource pool when partial sensing is configured in the UE by a higher layer and monitoring a slot ty−k×Preserve in the sidelink resource pool for a set of Preserve and a set of k no earlier than n−T0, wherein a slot ty is in the set of candidate slots, the set of Preserve comprises a subset of resource reservation periodicities, the set of k corresponds to one or more periodic sensing occasions, and T0 is a length of a sensing window. In a third aspect of the present disclosure, a non-transitory machine-readable storage medium has stored thereon instructions that, when executed by a computer, cause the computer to perform the above method. In a fourth aspect of the present disclosure, a chip includes a processor, configured to call and run a computer program stored in a memory, to cause a device in which the chip is installed to execute the above method. In a fifth aspect of the present disclosure, a computer readable storage medium, in which a computer program is stored, causes a computer to execute the above method. In a sixth aspect of the present disclosure, a computer program product includes a computer program, and the computer program causes a computer to execute the above method. In a seventh aspect of the present disclosure, a computer program causes a computer to execute the above method. B