EP-4740671-A1 - CANDIDATE RESOURCES AND SIDELINK CONTROL INFORMATION DESIGN FOR SIDELINK ON UNLICENSED SPECTRUM

EP4740671A1EP 4740671 A1EP4740671 A1EP 4740671A1EP-4740671-A1

Abstract

Disclosed are methods, systems, and computer-readable medium to perform operations including: receiving sidelink control information (SCI) specifying a total number of sub-channels over a resource pool that are candidates for a sidelink transmission; selecting, based on the total number of sub-channels over the resource pool specified in the SCI, a candidate single-slot resource that includes a set of contiguous sub-channels in a set of resource blocks; and transmitting, to a user equipment (UE), a physical sidelink shared channel (PSSCH) or physical sidelink control channel (PSCCH) transmission based on the selected candidate single-slot resource that includes the set of contiguous sub-channels in the set of resource blocks.

Inventors

YE, CHUNXUAN
ZHANG, DAWEI
SUN, HAITONG
HE, HONG
NIU, HUANING
CUI, JIE
ZENG, WEI

Assignees

Apple Inc.

Dates

Publication Date: 20260513
Application Date: 20240806

Claims (1)

Attorney Docket No.50759-0975WO1/ P63461WO1 WHAT IS CLAIMED IS: 1. One or more processors configured for performing wireless communication by performing operations comprising: identifying, from a medium access control (MAC) layer, data specifying a total number of sub-channels over a resource pool that are candidates for a sidelink transmission; selecting, based on the total number of sub-channels over the resource pool specified in the MAC layer, a candidate single-slot resource that includes a set of contiguous sub- channels in a set of resource blocks; and preparing, for transmission to a user equipment (UE), a sidelink transmission based on the selected candidate single-slot. 2. The one or more processors of claim 1, wherein the number of candidate resource block sets is an integer number that is i) less than a total number of resource blocks of the resource pool and ii) divisible by the total number of sub-channels, and wherein the operations further comprise: selecting the number of candidate resource block sets based on the integer number. 3. The one or more processors of claim 1 or claim 2, wherein the data from the MAC layer further specifies a total number of candidate resource block sets. 4. The one or more processors of claim 3, the operations further comprising: selecting the candidate single-slot resource based on the number of candidate resource block sets, wherein a number of contiguous sub-channels in a set of contiguous RB sets is ^ ೞೠ್^ಹ ^ೃಳೞ^^ െ 1, wherein ^^ ^௨^^ு is the total number of sub-channels and wherein ^^ ோ^^^௧ is the total number of candidate resource block sets. 5. The one or more processors of any of claim 1 through claim 4, the operations further comprising: selecting the candidate single-slot resource based on the number of candidate resource block sets, wherein a number of contiguous sub-channels in a set of contiguous RB sets is ^ ೞೠ್^ಹ ^ೃಳೞ^^ െ 1, wherein ^^ ^௨^^ு is the total number of sub-channels and wherein ^^ ோ^^^௧ is the total number candidate resource block sets. Attorney Docket No.50759-0975WO1/ P63461WO1 6. The one or more processors of claim 5, wherein the number of candidate resource block sets is based on a channel busy ratio (CBR) of each of the candidate resource block sets. 7. The one or more processors of claim 5, wherein the number of candidate resource block sets is based on a channel occupancy ratio (CR) of each of the candidate resource block sets. 8. The one or more processors of claim 5, the operations further comprising: identifying a resource block set associated with a consistent failure a listen before talk (LBT) operation; and wherein the number of candidate resource block sets exclude the identified resource block set associated with the failed LBT operation. 9. The one or more processors of any of claim 1 through claim 8, the operations further comprising: identifying, from a medium access control (MAC) layer, a resource block set associated with a consistent failure of a listen before talk (LBT) operation; and excluding, from a set of candidate resource blocks for sending the sidelink transmission, the resource block set associated with the consistent failed LBT operation. 10. The one or more processors of claim 9, wherein a total number of candidate single slot resources excludes the resource block set associated with the consistent failed LBT operation. 11. The one or more processors of claim 9, wherein a total number of candidate single slot resources includes the resource block set associated with the consistent failed LBT operation. 12. The one or more processors of claim 9, the operations further comprising: pausing physical sidelink feedback channel (PSFCH) transmissions on the excluded resource block set even when a PSSCH with the corresponding PSFCH occasion on this resource block set is received. Attorney Docket No.50759-0975WO1/ P63461WO1 13. The one or more processors of claim 9, the operations further comprising: causing transmission of a PSFCH on the excluded resource block set after receiving PSSCH with the corresponding PSFCH occasion on the excluded resource block set. 14. The one or more processors of claim 9, the operations further comprising: determining whether to transmit a PSFCH based on the resource pool configuration or pre- configuration. 15. The one or more processors of claim 9, the operations further comprising: determining whether to transmit a PSFCH based on sidelink control information (SCI) associated with the PSSCH transmission. 16. The one or more processors of any of claim 1 through claim 15, wherein the candidate single-slot resource for transmission is defined as ^ ^^ ௪,௫,௬ , ^^ ௪ା^ି^,௫ା^ି^,௬ ൧, wherein y represents a slot index, w represents a resource block channel index, and wherein J represents a number of contiguous sub-channels in a set of ^^ ^௨^^ு ⁄ ^^ contiguous resource block sets. 17. One or more processors configured for performing wireless communication by performing operations comprising: receiving, in downlink control information (DCI), configuration data specifying channel occupancy time (COT) sharing information; and preparing, for transmission to one or more user equipment devices (UEs), the COT sharing information including identifiers of one or more UEs. 18. The one or more processors of claim 17, the COT sharing information including an additional identifiers field that specifies a UE destination identifier. 19. The one or more processors of claim 18, the additional identifiers field further specifying a UE source identifier. 20. The one or more processors of claim 18, the UE destination identifier being a group identifier. Attorney Docket No.50759-0975WO1/ P63461WO1 21. The one or more processors of claim 18, the COT sharing information including an additional identifiers number field that specifies whether the additional identifiers field includes a source identifier. 22. The one or more processors of any of claims 17 through claim 21, the COT sharing information further specifying a COT duration in slots. 23. The one or more processors of any of claims 17 through claim 22, the COT sharing information further specifying a COT offset value in slots. 24. The one or more processors of any of claim 17 through claim 23, wherein the DCI specifies a frequency resource assignment with a first field specifying a frequency assignment for a resource block set index. 25. The one or more processors of claim 24, the DCI further specifying the frequency resource assignment with a second field specifying a frequency assignment for a sub-channel index in the resource block set, as well as the lowest index of the RB set allocation to the initial transmission. 26. One or more processors configured for performing wireless communication by performing operations comprising: receiving, in sidelink control information (SCI), configuration data specifying channel occupancy time (COT) sharing information; and preparing, for transmission to one or more user equipment devices (UEs), PUSCH or PSSCH data based on the COT sharing information. 27. The one or more processors of claim 26, the COT sharing information including an additional identifiers field that specifies a UE destination identifier. 28. The one or more processors of claim 27, the additional identifiers field further specifying a UE source identifier. 29. The one or more processors of claim 27, the UE destination identifier being a group identifier. Attorney Docket No.50759-0975WO1/ P63461WO1 30. The one or more processors of claim 27, the COT sharing information including an additional identifiers number field that specifies whether the additional identifiers field includes a source identifier. 31. The one or more processors of any of claim 26 through claim 30, the COT sharing information further specifying a COT duration in slots. 32. The one or more processors of any of claim 26 through claim 31, the COT sharing information further specifying a COT offset value in slots. 33. The one or more processors of any of claim 26 through claim 32, wherein the SCI includes fields of SCI format 2-A comprising a hybrid automatic repeat request (HARQ) process number; a new data indicator; a redundancy version; a source identifier; a destination identifier; a HARQ feedback enabled/disabled indicator; a CSI request; and a cast type indicator. 34. The one or more processors of any of claim 26 through claim 33, wherein the SCI includes a zone identifier and a communication range value. 35. The one or more processors of any of claim 26 through claim 34, wherein the SCI includes a joint indicator specifying both a COT starting offset and a COT duration. 36. A system for wireless communication comprising one or more processors and one or more storage devices on which are stored instructions that are operable, when executed by the one or more computers, to cause the one or more computers to perform the method of any of claim 1 through claim 35. 37. An apparatus for wireless communication comprising the one or more processors of any of claim 1 through claim 35. 38. A method for wireless communication performed by one or more processors to perform the operations of any of claim 1 through claim 35.

Description

Attorney Docket No.50759-0975WO1/ P63461WO1 Candidate Resources and Sidelink Control Information Design for Sidelink on Unlicensed Spectrum CLAIM OF PRIORITY [0001] This application claims priority under 35 U.S.C. §119(e) to U.S. Patent Application Serial No. 63/531,702, filed on August 9, 2023, the entire contents of which are hereby incorporated by reference. BACKGROUND [0002] Wireless communication networks provide integrated communication platforms and telecommunication services to wireless user devices. Example telecommunication services include telephony, data (e.g., voice, audio, and/or video data), messaging, and/or other services. The wireless communication networks have wireless access nodes that exchange wireless signals with the wireless user devices using wireless network protocols, such as protocols described in various telecommunication standards promulgated by the Third Generation Partnership Project (3GPP). Example wireless communication networks include time division multiple access (TDMA) networks, frequency-division multiple access (FDMA) networks, orthogonal frequency-division multiple access (OFDMA) networks, Long Term Evolution (LTE), and Fifth Generation New Radio (5G NR). The wireless communication networks facilitate mobile broadband service using technologies such as OFDM, multiple input multiple output (MIMO), advanced channel coding, massive MIMO, beamforming, and/or other features. SUMMARY [0003] This disclosure describes how to define candidate resources for mode 2 resource allocation (selection). For mode 2, the transmitting UE is configured to select sidelink transmission resources itself. For mode 1, the network is configured to allocate sideline transmission resources for the transmitting UE. For mode 1, the network allocates resources from candidate resources that include an RB set in a resource pool. The network defines a sub- channel within each RB set. The sub-channels are in the frequency domain. In legacy operation, a set of consecutive sub-channels are selected for a set of N sub-channels (e.g., a set of 10 sub- channels). A UE can select the consecutive sub-channels for the transmission (e.g., 2 sub- channels). However, for sidelink operation using unlicensed spectrum (SL-U), a resource pool can include multiple RB sets. In an example, the resource pool includes two RB sets (RB set 1 Attorney Docket No.50759-0975WO1/ P63461WO1 and RB set 2), each including 5 sub-channels. The UE can select a first set of sub-channels in RB set 1 or RB set 2. Alternatively, the UE can select a first sub-channel from RB set 1 and a second sub-channel from RB set 2, wherein resources are allocated from two different RB sets. In legacy resource allocation signaling, the resource allocation is designated (in either mode 1 or mode 2) by an index or starting sub-channel of the RB set, as the sub-channels that are selected are consecutive in legacy operation. For example, a UE may indicate the index of sub- channel 2 to allocate sub-channels 2 and 3 of the RB set as candidate resources. In SL-U, because there are multiple RB sets available, the allocation information includes additional information that enables other UEs to determine each of the sub-channel(s) and RB set(s) allocated for transmission by the UE. [0004] This disclosure describes process to perform SL-U mode 2 resource selection to avoid RB sets in a resource pool for which there is consistent LBT failure for a UE. For example, a particular RB set may be allocated to other devices in a network (e.g., WI-FI, etc.). When the UE performs LBT operation, the UE may repeatedly fail to transmit because the channel is constantly occupied. For example, the UE may fail to transmit using a particular RB set more than a threshold number of times or for a threshold time period. In this case, the processes described herein enable the UE to exclude one or more RB sets from the candidate resources for mode 2 resource selection when those RB sets have caused LBT failure for the UE. [0005] This disclosure describes the configuration of sidelink control information (SCI) and downlink control information (DCI) for SL-U. For example, when a first UE sends a transmission to a second UE for side link communication, the first UE transmits control information to the second UE to configure the communications link. The SCI specifies the COT-sharing information for the first UE and the second UE and possibly for one or more additional UEs. Legacy SCI does not specify COT-sharing information for SL-U. The DCI includes content for time and frequency resources for sidelink transmissions for SL-U. The DCI, for mode 1, specifies to the transmitting UE which resources the transmitting UE should use for SL communication. The DCI is modified to provide the time and frequency resources for SL-U operation. [0006] In accordance with one aspect of the present disclosure, a process includes identifying, from a medium access control layer, data specifying a total