Method and apparatus for sidelink transmission in unlicensed spectrum

Abstract

The invention provides a method, a system and equipment for sidelink transmission in unlicensed spectrum in a wireless communication system. The method comprises the following steps: receiving configuration for configuring a first sidelink resource pool; triggering or requesting resource selection or reselection based on sensing to perform one or more sidelink transmissions in a first pool of sidelink resources, wherein one parameter is provided or determined or used to indicate that a second number of consecutive transmission time intervals is greater than one; determining a candidate resource set, comprising: determining a first number of candidate resources in a resource selection window, wherein the first number of candidate resources includes only candidate resources in which each candidate resource starts at a transmission time interval associated with the first sidelink resource pool and has a second number of consecutive transmission time intervals in the first sidelink resource pool, and the second number of consecutive transmission time intervals are consecutive in the physical transmission time intervals.

Description

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to and the benefit of U.S. Provisional Patent Application No. 63 / 539,286, filed on September 19, 2023, which is incorporated herein by reference. Technical Field

[0003] The present disclosure relates generally to wireless communication networks, and more particularly, to a method and apparatus for sidelink transmissions in an unlicensed spectrum in a wireless communication system. Background Art

[0004] With the rapid growth of the demand for transmitting large amounts of data to and from mobile communication devices, traditional mobile voice communication networks have evolved into networks that communicate using Internet Protocol (IP) packets. This IP packet communication can provide IP-bearing voice, multimedia, multicast and on-demand communication services for users of mobile communication devices.

[0005] An exemplary network structure is an Evolved Universal Terrestrial Radio Access Network (E-UTRAN). The E-UTRAN system can provide high data throughput to enable the above-mentioned IP-bearing voice and multimedia services. Currently, the 3GPP standards organization is discussing new next-generation (e.g., 5G) new radio technologies. Therefore, changes to the current body of 3GPP standards are currently being submitted and considered to enable the 3GPP standards to evolve and complete. Summary of the invention

[0006] The present invention provides a method, system and device for sidelink transmission in an unlicensed spectrum in a wireless communication system, wherein a method of a first user equipment (User Equipment, UE) includes: receiving a configuration for configuring one or more sidelink resource pools including a first sidelink resource pool, wherein the first sidelink resource pool is configured in a first carrier associated with an unlicensed or shared spectrum or is configured in an unlicensed or shared spectrum; triggering or requesting a sensing-based resource selection or reselection to perform one or more sidelink transmissions in the first sidelink resource pool, wherein a parameter is provided or determined or used as an indication of a second continuous transmission time interval (Transmission TimeInterval, TTI) number is greater than one; determine a candidate resource set, including: determine a first number of candidate resources in a resource selection window, wherein the first number of candidate resources only includes candidate resources in which each candidate resource starts at a TTI associated with the first side link resource pool and has the second number of consecutive TTIs in the first side link resource pool, and the second number of consecutive TTIs are consecutive in a physical TTI; and determine the candidate resource set from the first number of candidate resources, wherein the number of third candidate resources in the candidate resource set is greater than or equal to X% of the first number of candidate resources; select one or more resources for side link transmission in the first side link resource pool from the candidate resource set; and perform side link transmission on at least one of the selected one or more resources.

[0007] In various embodiments, a method for a first UE includes: receiving a configuration for configuring one or more side link resource pools including a first side link resource pool, wherein the first side link resource pool is configured in a first carrier associated with an unlicensed or shared spectrum or is configured in an unlicensed or shared spectrum; triggering or requesting sensing-based resource selection or reselection to perform one or more side link transmissions in the first side link resource pool, wherein a parameter is provided or determined or used to indicate that the number of second consecutive TTIs is greater than one; determining a candidate resource set, including: determining a first number of candidate resources in a resource selection window, wherein the first number of candidate resources does not include a starting A first candidate resource is selected from a TTI associated with the first side link resource pool and has the second number of consecutive TTIs in the first side link resource pool, and at least two consecutive TTIs of the second number of consecutive TTIs of the first candidate resource are discontinuous in the physical TTI; and the candidate resource set is determined from the first number of candidate resources, wherein the number of third candidate resources in the candidate resource set is greater than or equal to X% of the first number of candidate resources; one or more resources for side link transmission in the first side link resource pool are selected from the candidate resource set; and side link transmission is performed on at least one of the selected one or more resources.

[0008] In various embodiments, a method includes: receiving a configuration for configuring a first side link resource pool; triggering or requesting sensing-based resource selection or reselection to perform one or more side link transmissions in the first side link resource pool, wherein a parameter is provided or determined or used to indicate that a second number of consecutive TTIs is greater than one; determining a set of candidate resources, including: determining a first number of candidate resources in a resource selection window, wherein the first number of candidate resources only includes candidate resources in which each candidate resource starts at a TTI associated with the first side link resource pool and has a second number of consecutive TTIs in the first side link resource pool, and the second number of consecutive TTIs are consecutive in a physical TTI. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 A diagram showing a wireless communication system according to an embodiment of the present invention is shown.

[0010] Figure 2 is a block diagram of a transmitter system (also referred to as an access network) and a receiver system (also referred to as a user equipment or UE) according to an embodiment of the present invention.

[0011] Figure 3 is a functional block diagram of a communication system according to an embodiment of the present invention.

[0012] Figure 4 According to an embodiment of the present invention Figure 3Functional block diagram of the program code.

[0013] Figure 5 is an exemplary diagram according to an embodiment of the present invention, in which, assuming that a higher layer of the TX UE indicates 2 subchannels as one candidate resource, the TX UE determines M total candidate resources in the sidelink resource pool 1.

[0014] Figure 6 is an example diagram showing that the switching boundary is at the end of the 5th time slot according to an embodiment of the present invention.

[0015] Figure 7 is an exemplary diagram showing that information provided by a higher layer of a UE for resource identification is “1 RB set, 2 subchannels, 3 time slots” according to an embodiment of the present invention.

[0016] Figure 8 is an example diagram showing that sparse TTIs for candidate resources (but contiguous in the logical domain) cause the UE to perform an additional type 1 channel access procedure for accessing the channel according to an embodiment of the present invention.

[0017] Fig. 9 is an example diagram showing candidate resources starting from a TTI in a sidelink resource pool but including / having a TTI outside the sidelink resource pool according to an embodiment of the present invention, such candidate resources being harmful to the UE because the number of opportunities for the UE to use for sidelink transmission in an unlicensed spectrum is reduced.

[0018] Fig.10 is a flowchart of a method for a first UE / device according to an embodiment of the present invention including the following steps: receiving a configuration for configuring more than one side link resource pool including a first side link resource pool and a second side link resource pool; selecting one or more resources for side link transmission in the first side link resource pool; determining an EDT for a type 1 channel access procedure (for one same RB set) to initiate a COT including both TTI i and TTI i+1; and preferably, in some embodiments, transmitting an SCI on TTI i, wherein the SCI provides COT sharing information including a remaining COT duration (which includes TTI i+1).

[0019] Fig.11is a flowchart of a method for a first UE / device according to an embodiment of the present invention including the following steps: receiving a configuration for configuring a first side link resource pool in an unlicensed / shared spectrum; triggering or requesting sensing-based resource (re)selection to perform PSSCH / PSCCH transmission in the first side link resource pool; determining a candidate resource set including TTIs associated with the first side link resource pool and TTIs not associated with the first side link resource pool in a resource selection window; selecting one or more resources for side link transmission in the first side link resource pool; and performing PSSCH / PSCCH transmission on at least one of the selected side link resources.

[0020] Fig.12 The present invention is a flowchart of a method for a first UE according to an embodiment of the present invention, including the following steps: receiving a configuration for configuring one or more side link resource pools including a first side link resource pool; triggering or requesting sensing-based resource selection or reselection to perform one or more side link transmissions in the first side link resource pool; determining a candidate resource set, including: determining a first number of candidate resources in a resource selection window and determining a candidate resource set from the first number of candidate resources; selecting one or more resources for side link transmission in the first side link resource pool from the candidate resource set; and performing a side link transmission on at least one of the selected one or more resources.

[0021] Fig.13 The present invention is a flowchart of a method for a first UE according to an embodiment of the present invention, including the following steps: receiving a configuration for configuring one or more side link resource pools including a first side link resource pool; triggering or requesting sensing-based resource selection or reselection to perform one or more side link transmissions in the first side link resource pool; determining a candidate resource set, including: determining a first number of candidate resources in a resource selection window and determining a candidate resource set from the first number of candidate resources; selecting one or more resources for side link transmission in the first side link resource pool from the candidate resource set; and performing a side link transmission on at least one of the selected one or more resources. DETAILED DESCRIPTION

[0022] The present invention described herein may be applied to or implemented in the exemplary wireless communication systems and devices described below. In addition, the present invention is mainly described in the context of the 3GPP architecture reference model. However, it should be understood that with the help of the disclosed information, those skilled in the art can easily adapt to use and implement various aspects of the present invention in the 3GPP2 network architecture as well as other network architectures.

[0023] The exemplary wireless communication systems and devices described below employ wireless communication systems that support broadcast services. Wireless communication systems are widely deployed to provide various types of communications, such as voice, data, etc. These systems can be based on code division multiple access (DMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), 3GPP Long Term Evolution (LTE) wireless access, 3GPP Long Term Evolution Advanced (LTE-A) wireless access, 3GPP2 Ultra Mobile Broadband (UMB), WiMax, 3GPP New Radio (NR), or some other modulation technology.

[0024] In particular, the exemplary wireless communication systems and devices described below may be designed to support one or more standards, such as those provided by an alliance named “3rd Generation Partnership Project” referred to herein as 3GPP, including: [1] 3GPP Specification 38.321 v16.7.0; [2] R1-2308756, Editor’s Summary of Draft CR 37.213 for SL-U; [3] R1-2308720, Introduction of Specification Enhancements for NR Sidelink Evolution; [4] R1-2308714, Introduction of Rel-18 NR Sidelink Evolution; [5] 3GPP TS 38.331 V17.0.0 (2022-03) 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; Radio Resource Control (RRC) Protocol Specification (Release 17); and [6] RP-222806. The standards and documents listed above are hereby expressly and completely incorporated herein by reference in their entirety.

[0025] Figure 1 1 shows a multiple access wireless communication system according to an embodiment of the present invention. An access network (AN) 100 includes multiple antenna groups, one antenna group includes 104 and 106, another antenna group includes 108 and 110, and another antenna group includes 112 and 114. Figure 11, only two antennas are shown for each antenna group, however, each antenna group may utilize more or fewer antennas. Access terminal (AT) 116 communicates with antennas 112 and 114, where antennas 112 and 114 transmit information to access terminal 116 via forward link 120 and receive information from AT 116 via reverse link 118. AT 122 communicates with antennas 106 and 108, where antennas 106 and 108 transmit information to AT 122 via forward link 126 and receive information from AT 122 via reverse link 124. In an FDD system, communication links 118, 120, 124, and 126 may use different frequencies for communication. For example, forward link 120 may use a different frequency than the frequency used by reverse link 118.

[0026] Each group of antennas and / or the area in which they are designed to communicate is often referred to as a sector of the access network. In an embodiment, the antenna groups are each designed to communicate with access terminals in a sector of the area covered by the access network 100.

[0027] In communications on forward links 120 and 126, the transmit antennas of access network 100 may utilize beamforming in order to improve the signal-to-noise ratio of the forward links for the different access terminals 116 and 122. Additionally, an access network transmitting to access terminals randomly dispersed throughout its coverage area using beamforming may cause less interference to access terminals in neighboring cells than if the access network transmitted to all of its access terminals via a single antenna.

[0028] AN may be a fixed station or base station for communicating with a terminal, and may also be referred to as an access point, Node B, base station, enhanced base station, eNodeB, or some other term. AT may also be referred to as user equipment (UE), a wireless communication device, a terminal, an access terminal, or some other term.

[0029] Figure 2 2 is a simplified block diagram of an embodiment of a transmitter system 210 (also referred to as an access network) and a receiver system 250 (also referred to as an access terminal (AT) or user equipment (UE)) in a MIMO system 200. At the transmitter system 210, traffic data for a number of data streams from a data source 212 is provided to a transmit (TX) data processor 214.

[0030] In one embodiment, each data stream is transmitted through a corresponding transmit antenna.TX data processor 214 formats, codes, and interleaves the traffic data for each data stream based on a particular coding scheme selected for that data stream to provide coded data.

[0031] The decoded data for each data stream may be multiplexed with pilot data using OFDM techniques. The pilot data is typically a known data pattern that is processed in a known manner and may be used at the receiver system to estimate the channel response. The multiplexed pilot and decoded data for each data stream are then modulated (e.g., symbol mapped) based on a particular modulation scheme (e.g., BPSK, QPSK, M-PSK, or M-QAM) selected for the data stream to provide modulation symbols. The data rate, coding, and modulation for each data stream may be determined by instructions executed by the processor 230. The memory 232 is coupled to the processor 230.

[0032] The modulation symbols for all data streams are then provided to a TX MIMO processor 220, which may further process the modulation symbols (e.g., for OFDM). The TX MIMO processor 220 then converts the N T The modulation symbol stream is provided to N T 1 transmitters (TMTRs) 222a through 222t. In certain embodiments, TX MIMO processor 220 applies beamforming weights to the symbols of the data streams and to the antenna from which the symbol is being transmitted.

[0033] Each transmitter 222 receives and processes a respective symbol stream to provide one or more analog signals, and further conditions (eg, amplifies, filters, and up-converts) the analog signals to provide a modulated signal suitable for transmission via a MIMO channel. T The antennas 224a to 224t transmit the N signals from the transmitters 222a to 222t. T a modulated signal.

[0034] At the receiver system 250, N R The transmitted modulated signals are received by each antenna 252a through 252r and the received signal from each antenna 252 is provided to a respective receiver (RCVR) 254a through 254r. Each receiver 254 conditions (e.g., filters, amplifies, and downconverts) a respective received signal, digitizes the conditioned signal to provide samples, and further processes the samples to provide a corresponding “received” symbol stream.

[0035] RX data processor 260 then extracts the N R The receiver 254 receives and processes NR received symbol streams to provide N R The RX data processor 260 then demodulates, deinterleaves, and decodes each detected symbol stream to recover the traffic data for the data stream. The processing by the RX data processor 260 is complementary to the processing performed by the TX MIMO processor 220 and the TX data processor 214 at the transmitter system 210.

[0036] Processor 270 periodically determines which precoding matrix to use (discussed below). Processor 270 formulates a reverse link message comprising a matrix index portion and a rank value portion.

[0037] The reverse link message may include various types of information about the communication link and / or the received data stream. The reverse link message is then processed by the TX data processor 238, which also receives traffic data for a number of data streams from the data source 236, modulated by the modulator 280, conditioned by the transmitters 254a to 254r, and transmitted back to the transmitter system 210.

[0038] At the transmitter system 210, the modulated signal from the receiver system 250 is received by the antenna 224, conditioned by the receiver 222, demodulated by the demodulator 240, and processed by the RX data processor 242 to extract the reverse link message transmitted by the receiver system 250. The processor 230 then determines which precoding matrix to use to determine the beamforming weights and then processes the extracted message.

[0039] The memory 232 may be used to temporarily store some buffer / calculation data from 240 or 242 passing through the processor 230, store some buffer data from 212, or store some specific program codes. Also, the memory 272 may be used to temporarily store some buffer / calculation data from 260 passing through the processor 270, store some buffer data from 236, or store some specific program codes.

[0040] Steering Figure 3 , this figure shows an alternative simplified functional block diagram of a communication device according to one embodiment of the present invention. Figure 3 As shown in FIG. , the communication device 300 in the wireless communication system can be used to implement Figure 1UE (or AT) 116 and 122 in, and the wireless communication system is preferably an NR system. The communication device 300 may include an input device 302, an output device 304, a control circuit 306, a central processing unit (CPU) 308, a memory 310, a program code 312, and a transceiver 314. The control circuit 306 executes the program code 312 in the memory 310 through the CPU 308, thereby controlling the operation of the communication device 300. The communication device 300 can receive a signal input by a user through the input device 302 (for example, a keyboard or a keypad), and can output images and sounds through the output device 304 (for example, a display or a speaker). The transceiver 314 is used to receive and transmit wireless signals, pass the received signal to the control circuit 306, and wirelessly output the signal generated by the control circuit 306.

[0041] Figure 4 According to an embodiment of the present invention Figure 3 4. In this embodiment, program code 312 includes application layer 400, layer 3 portion 402, and layer 2 portion 404, and is coupled to layer 1 portion 406. Layer 3 portion 402 typically performs radio resource control. Layer 2 portion 404 typically performs link control. Layer 1 portion 406 typically performs physical connectivity.

[0042] For LTE, LTE-A or NR systems, the layer 2 portion 404 may include a radio link control (RLC) layer and a medium access control (MAC) layer. The layer 3 portion 402 may include a radio resource control (RRC) layer.

[0043] Any two or more of the following paragraphs, (sub)bullets, points, actions or claims described in each invention paragraph or section may be logically, reasonably and appropriately combined to form a specific method.

[0044] Any sentence, paragraph, (sub) bullet, key point, action or claim described in each of the following invention paragraphs or sections can be implemented independently and individually to form a specific method or device. The following invention disclosures such as "based on", "more specifically", "examples" and other related information are only one possible embodiment that does not limit a specific method or device.

[0045] In [1] 3GPP specification 38.321 v16.7.0, the following references the RAN1 protocol used so far for L unlicensed spectrum.

[0046] 1 Objective #2: NR Sidelink on Unlicensed Spectrum (SL-U)

[0047] 1.1 RAN1#109-e (May 9 to 20, 2022)

[0048] Channel access and resource allocation

[0049]

[0050]

[0051] PHY Structure and Procedures

[0052]

[0053] 1.2 RAN1#110 (August 22 to 26, 2022)

[0054] Channel access and resource allocation

[0055]

[0056]

[0057]

[0058] PHY Structure and Procedures

[0059]

[0060] 1.3 RAN1#110bis-e (October 10-19, 2022)

[0061] Channel access and resource allocation

[0062]

[0063] PHY Structure and Procedures

[0064]

[0065]

[0066]

[0067] 1.4 RAN1#111 (November 14-18, 2022)

[0068] Channel access and resource allocation

[0069]

[0070] PHY Structure and Procedures

[0071]

[0072]

[0073] 1.5 RAN1#112 (February 27 to March 3, 2023)

[0074] Channel access and resource allocation

[0075]

[0076]

[0077] PHY Structure and Procedures

[0078]

[0079]

[0080] 1.6 RAN1#112bis-e (April 17 to 26, 2023)

[0081] Channel access and resource allocation

[0082]

[0083] PHY Structure and Procedures

[0084]

[0085]

[0086]

[0087]

[0088] 1.7 RAN1#113 (May 22-26, 2023)

[0089] Channel access and resource allocation

[0090]

[0091]

[0092] PHY Structure and Procedures

[0093]

[0094]

[0095]

[0096] 1.8 RAN1#114 (August 21-25, 2023)

[0097] protocol

[0098] "CAPC level of channel occupancy initiated", payload size is 2 bits and it is carried in level 2 SCI.

[0099] protocol

[0100] Based on the "Frequency Resource Assignment" field in the level-1 SCI corresponding to the PSSCH with COT sharing, the applicable RB set for COT sharing is derived.

[0101] ○……

[0102] protocol

[0103] In case a COT initiating UE initiates SL transmission using Type 1 channel access procedure, in order to support the COT initiating UE to restart its transmission within the same channel occupancy after the transmission of the COT responding UE,

[0104] ● If the COT initiator UE determines the TX gap between the responding UE's SL transmission and the initiator UE's restarted transmission

[0105] o In case the gap is at least 25 μs, or equal to 16 μs, or at most 16 μs, the COT initiating UE performs Type 2A or Type 2B or Type 2C SL channel access procedure respectively.

[0106] ● Otherwise, the COT initiating UE performs a Type 2 ASL channel access procedure to restart its SL transmission.

[0107] protocol

[0108] A UE that initiates channel occupancy for SL transmission using a Type 1 channel access procedure may restart its transmission within the same channel occupancy by performing a Type 2 ASL channel access procedure after the COT initiating UE has stopped transmission if the channel sensed by the UE is continuously idle.

[0109] protocol

[0110] The "remaining COT duration" is expressed in physical time slots and it is carried in the level 2 SCI. The payload size is 4 bits in 15kHz, 5 bits in 30kHz and 6 bits in 60kHz

[0111] • If the indicated remaining COT duration is 0 slots, the initiator UE does not share the COT.

[0112] • The starting time slot within the remaining COT duration is the time slot in which the COT-SI is transmitted.

[0113] o It should be noted that when COT-SI is transmitted in slot n, and if the remaining COT duration is set to K, the end point of the COT duration to be shared is slot n+K.

[0114] Note: The "Remaining COT duration" cannot make the COT exceed the maximum COT duration.

[0115] Work plan

[0116] When the UE performs Type 1 channel access to a MCSt carrying multiple TBs, the CAPC value to be used in the Type 1 channel access is the highest CAPC value (lowest CAPC level) associated with the multiple TBs.

[0117] ●……

[0118] Work plan

[0119] In Mode 2 resource allocation:

[0120] ●Alternative 1: (Rectangular shape)

[0121] ○For connected RB-based

[0122] ■Candidate multi-slot resource R x,y is defined as the time slot from Initial N slot,MCSt L starting from subchannel x in consecutive time slots subCH A set of connected subchannels.

[0123] ○ For interleaved RB

[0124] ■Candidate multi-slot resource R x,y,z is defined as L starting from RB set z RBset Contiguous RBs are concentrated from time slots Initial N slot,MCSt L starting from subchannel x in consecutive time slots subCH A set of connected subchannels.

[0125] ■Candidate single-slot resource R x,y,zis defined as L starting from RB set z RBset Contiguous RBs are concentrated from time slots The L starting from the subchannel x in subCH A set of connected subchannels.

[0126] • It should be noted that different candidate multi-slot resources may overlap in time.

[0127] -……

[0128] protocol

[0129] In Mode 2 resource allocation,

[0130] ● Higher layers may indicate a "number of consecutive slots of MCSt" (N slot,MCSt ), used by L1 to report multi-slot candidates to higher layers. Application candidate multi-slot resource definition.

[0131] ○ Otherwise, the candidate single-slot resource definition applies (same as R16 / 17).

[0132] ● Higher layers receive the reported S from the UE based on one of the following implementations: A Select resources:

[0133] ○ According to the random selection of R16 / 17

[0134] ○ Higher layers are not restricted to randomly selecting resources and can select in consecutive time slots

[0135] ■ Detailed behavior defined by RAN2 as needed

[0136] ○RAN1's ​​intention is that once the higher layers are from set S A In the MCSt, a multi-slot candidate is selected which will use all single-slot resources of the selected multi-slot candidate for transmission. This RAN1 protocol is not intended to be a potential RAN2 discussion on how to define the SL resource selection procedure in MCSt.

[0137] • Note that the above is intended to support only Method 1 and Method 2.

[0138] ● Send LS to RAN2 to inform RAN2 to make a decision on HARQ RTT timing (minimum time gap)

[0139] ○ Whether the single TB operation assumption transmitted on consecutive time slots is supported in the resource pool configured with PSFCH resources

[0140] For PSCCH / PSSCH transmission based on staggered RBs in SL-U:

[0141] ● Sequential mapping of PSCCH modulation symbols on the PRBs of the subchannel, regardless of the number of interleavings within a subchannel

[0142] ● Among all allocated PRBs for PSSCH transmission, PSSCH modulation symbols are mapped sequentially on the PRBs regardless of the number of interlaces within one subchannel and the number of allocated subchannels

[0143] Note: If no problems occur before the end of RAN1#114, this working assumption will be automatically confirmed.

[0144] protocol

[0145] Regarding frequency domain resource indication for PSSCH transmission based on staggered RBs:

[0146] ○Alternative A: The MAC layer indicates L to the PHY layer subCH and L RBset Both, of which L RBset is the number of RB sets used for one PSCCH / PSSCH transmission

[0147] ■About L in Article 8.1.4 of TS 38.214 subCH , select one of the following in RAN1#114:

[0148] ●Sub-alternative 1: L subCH is the number of subchannels in each RB set to be used for PSSCH / PSCCH transmission in a slot.

[0149] Note:

[0150] Note: is the number of subchannels used in each RB set for one PSCCH / PSSCH transmission

[0151] • Resources from the RB set in which C-LBT failure is detected are not reported to the MAC layer.

[0152] ● Note: RAN1 assumes that in R1-2306174, the LS of RAN2 is followed: "MAC notifies the PHY of the RB set information in which C-LBT failure is detected"

[0153] protocol

[0154] Regarding "For contiguous RB-based PSCCH / PSSCH transmission in SL-U, only option 3 is supported for subchannels containing intra-cell guard band PRBs" and "Option 3: Such subchannels cannot be used for PSCCH transmission but can be used for PSSCH transmission":

[0155] ● exclude The lowest subchannel contains candidate resources for the guard band PRB in the cell

[0156] o Such exclusion is performed in the PHY layer and such candidate resources are excluded in step 1

[0157] protocol

[0158] For PSSCH transmission based on contiguous RBs:

[0159] ● As in the traditional NR SL, the MAC layer only indicates L subCH

[0160] ○L subCH is the number of subchannels within all used RB sets that will be used for PSSCH / PSCCH transmissions in a slot.

[0161] In [1] 3GPP specification 38.321 v16.7.0, the following references LBT related operations and SL operations:

[0162] 5.21 LBT Operation

[0163] 5.21.1 Overview

[0164] The lower layer may perform an LBT procedure, see TS 37.213

[18] , according to which the lower layer does not perform a transmission if the channel is identified as being occupied. When the lower layer performs an LBT procedure before a transmission and does not perform a transmission, an LBT failure indication is sent from the lower layer to the MAC entity. Unless otherwise specified, when an LBT procedure is performed for a transmission, the actions specified in this specification are performed regardless of whether an LBT failure indication is received from the lower layer. When LBT is not performed by the lower layer, an LBT failure indication is not received from the lower layer.

[0165] 5.22 SL-SCH Data Transmission

[0166] 5.22.1 SL-SCH data transmission

[0167] 5.22.1.1 SL Grant Receipt and SCI Transmission

[0168] The sidelink grant is received dynamically on the PDCCH, semi-statically configured by the RRC or autonomously selected by the MAC entity. The MAC entity will have the sidelink grant on the active SL BWP to determine the set of PSSCH durations in which the transmission of the SCI occurs, and the set of PSSCH durations in which the transmission of the SL-SCH associated with the SCI occurs. A sidelink grant addressed to a SLCS-RNTI with NDI=1 is considered a dynamic sidelink grant.

[0169] If the MAC entity has been configured with sidelink resource allocation mode 1, as indicated in TS 38.331 [5], then the MAC entity shall, for each PDCCH opportunity and for each grant received at this PDCCH opportunity:

[0170] 1> If a sidelink grant has been received on the PDCCH for the SL-RNTI of the MAC entity:

[0171] 2> If the NDI received on the PDCCH has not switched compared to the value in the previously received HARQ information for the HARQ process ID:

[0172] 3> Use the received sidelink grant to determine the PSCCH duration and PSSCH duration for one or more retransmissions of a single MAC PDU for the corresponding sidelink process in accordance with section 8.1.2 of TS 38.214 [7].

[0173] 2> Otherwise:

[0174] 3> Use the received sidelink grant to determine the PSCCH duration and PSSCH duration for initial transmission and (if applicable) retransmission of a single MAC PDU in accordance with section 8.1.2 of TS 38.214 [7].

[0175] 2> If a sidelink grant is available for retransmission of a positively acknowledged MAC PDU as specified in clause 5.22.1.3.1a:

[0176] 3> Clear the PSCCH duration and PSSCH duration corresponding to the retransmission of the MAC PDU from the sidelink grant.

[0177] 1> Otherwise, if a sidelink grant has been received on the PDCCH for the SL-RNTI of the MAC entity:

[0178] 2> If the PDCCH content indicates retransmission for the identified HARQ process ID that has been set for the activated configured sidelink grant identified by sl-ConfigIndexCG:

[0179] 3> Use the received sidelink grant to determine the PSCCH duration and PSSCH duration for one or more retransmissions of a single MAC PDU in accordance with section 8.1.2 of TS 38.214 [7].

[0180] 2> Otherwise, if the PDCCH content indicates a configured grant type 2 deactivation for a configured sidelink grant:

[0181] 3> Trigger a configured side link grant confirm for the configured side link grant.

[0182] 2> Otherwise, if the PDCCH content indicates a configured grant type 2 activation for a configured sidelink grant:

[0183] 3> trigger a configured side link grant confirmation for the configured side link grant;

[0184] 3>Store the configured side link grant;

[0185] 3> Initialize or reinitialize the configured sidelink grant to determine the PSCCH duration set and PSSCH duration set for transmission of multiple MAC PDUs according to Section 8.1.2 of TS 38.214 [7].

[0186] If the MAC entity has been configured to use sidelink resource allocation mode 2 to transmit using a resource pool in a carrier, as indicated in TS 38.331 [5] or TS 36.331

[21] , then based on sensing or partial sensing or random selection or any combination thereof, the MAC entity shall, for each sidelink process:

[0187] …

[0188] 1> If the MAC entity has been selected to create a selected sidelink grant corresponding to the transmission of multiple MAC PDUs, and SL data is available in the logical channel:

[0189] 2> If the MAC entity has not yet selected a resource pool to allow for the logical channel:

[0190] 3> If sl-HARQ-FeedbackEnabled is set to enabled for the logical channel:

[0191] 4> Select any resource pool that is configured with PSFCH resources.

[0192] 3> Otherwise:

[0193] 4>Select any resource pool in the resource pool.

[0194] 2> Perform TX resource (re)selection check on the selected resource pool as specified in clause 5.22.1.2;

[0195] …

[0196] 2> If TX resource (re)selection is triggered due to TX resource (re)selection check:

[0197] 3> If one or more SL DRXs are configured in the destination UE receiving SL-SCH data:

[0198] 4> Indicate to the physical layer the SL DRX active time in the destination UE receiving SL-SCH data as specified in clause 5.28.2.

[0199] 3> Select one of the allowed values ​​configured by RRC in sl-ResourceReservePeriodList and set the resource reservation interval P to the selected value rsvp_TX ;

[0200] …

[0201] 3> In the interval [5,15] above or equal to the resource reservation interval of 100ms or in the interval of the resource reservation interval below 100ms In the , an integer value is randomly selected with equal probability and SL_RESOURCE_RESELECTION_COUNTER is set to the selected value;

[0202] 3> The number of HARQ retransmissions is selected from the allowed number in sl-MaxTxTransNumPSSCH contained in sl-PSSCH-TxConfigList (if configured by RRC), and if configured by RRC, the allowed number overlaps in sl-MaxTxTransNumPSSCH indicated in sl-CBR-PriorityTxConfigList for the highest priority of the logical channels allowed on the carrier and the CBR measured by the lower layer according to clause 5.1.27 of TS38.215

[24] (if CBR measurement results are available) or the corresponding sl-defaultTxConfigIndex configured by RRC (if CBR measurement results are not available);

[0203] 3> select an amount of frequency resources within the range between sl-MinSubChannelNumPSSCH and sl-MaxSubchannelNumPSSCH contained in sl-PSSCH-TxConfigList (if configured by RRC), and if configured by RRC, the amount of frequency resources overlaps between MinSubChannelNumPSSCH and MaxSubchannelNumPSSCH indicated in sl-CBR-PriorityTxConfigList for the highest priority logical channel allowed on the carrier and the CBR measured by lower layers according to clause 5.1.27 of TS 38.215

[24] (if CBR measurement results are available) or the corresponding sl-defaultTxConfigIndex configured by RRC (if CBR measurement results are not available);

[0204] 3> If not configured by RRC, interUECoordinationScheme1Explicit or interUECoordinationScheme1Condition enables reception of preferred resource sets and non-preferred resource sets:

[0205] 4> If the upper layer configuration is based on random selection transmission:

[0206] 5> Randomly select the time and frequency resources for a transmission opportunity from a resource pool occurring within the SL DRX active time of the destination UE as specified in Section 5.28.2, based on the amount of selected frequency resources and the remaining PDBs of SL data available in the logical channels allowed on the carrier, and the destination UE is selected to indicate the above-mentioned SLDRX active time to the physical layer.

[0207] 5> If the selected resource for the initial transmit opportunity is not within the SL DRX Active Time as specified in clause 5.28.1 for any destination that has data to send:

[0208] 6> Use retransmission opportunities for initial transmission of PSCCH and PSSCH.

[0209] 4> Otherwise:

[0210] 5> Randomly select a time and frequency resource for a transmission opportunity from the resources indicated by the physical layer as specified in Section 8.1.4 of TS 38.214 [7] occurring within the SL DRX active time of the destination UE as specified in Section 5.28.2, based on the amount of selected frequency resources and the remaining PDBs of SL data available in the logical channels allowed on the carrier, and the destination UE is selected to indicate the above-mentioned SL DRX active time to the physical layer.

[0211] …

[0212] 3> If one or more HARQ retransmissions are selected:

[0213] 4> If not configured by RRC, interUECoordinationScheme1Explicit or interUECoordinationScheme1Condition enables reception of preferred resource sets and non-preferred resource sets:

[0214] 5> if transmission based on full sensing or partial sensing is configured by upper layers and leaves available resources for more transmission opportunities in the resources indicated by the physical layer according to clause 8.1.4 of TS 38.214 [7]; or

[0215] 5> If random selection based transmission is configured by upper layers and leaves available resources in the resource pool for more transmission opportunities:

[0216] 6> Based on the amount of selected frequency resources, the selected number of HARQ retransmissions and the remaining PDB of SL data available in the logical channels allowed on the carrier, by ensuring a minimum time gap between any two selected resources when the PSFCH is configured for this resource pool and the retransmission resources can be indicated by the time resource assignment of the previous SCI in accordance with Section 8.3.1.1 of TS38.212[9], to randomly select time and frequency resources for one or more transmission opportunities from the available resources occurring within the SL DRX active time of the destination UE as specified in Section 5.28.2, wherein the destination UE is selected to indicate the above-mentioned SL DRX active time to the physical layer.

[0217] …

[0218] 4> Use randomly selected resources to select a periodic set of resources separated by a resource reservation interval for the transmission of PSCCH and PSSCH corresponding to the number of retransmission opportunities of the MAC PDU determined in TS 38.214 [7];

[0219] 4> The first transmission opportunity set is regarded as an initial transmission opportunity, and the other transmission opportunity set is regarded as a retransmission opportunity;

[0220] 4> Consider the initial transmit opportunity set and the retransmit opportunity set as selected sidelink grants.

[0221] 3> Otherwise:

[0222] 4> Treat the set as the selected sidelink grant.

[0223] 3> Use the selected sidelink grant to determine the PSCCH duration set and PSSCH duration set according to TS 38.214 [7].

[0224] 2> Otherwise, if SL_RESOURCE_RESELECTION_COUNTER = 0, and when SL_RESOURCE_RESELECTION_COUNTER is equal to 1, a MAC entity is randomly selected with equal probability, which is a value in the interval [0,1] less than or equal to the probability configured by RRC in sl-ProbResourceKeep;

[0225] 3> Clear the selected sidelink grant if applicable;

[0226] 3> In the interval [5,15] above or equal to the resource reservation interval of 100ms or in the interval of the resource reservation interval below 100ms In the , an integer value is randomly selected with equal probability and SL_RESOURCE_RESELECTION_COUNTER is set to the selected value;

[0227] 3> Use the previously selected sidelink grant again to determine the PSCCH duration set and PSSCH duration set according to TS 38.214 [7] for the number of MAC PDU transmissions determined under the resource reservation interval as in TS 38.214 [7].

[0228] 1> If the MAC entity has chosen to create a selected sidelink grant corresponding to the transmission of a single MAC PDU, and if SL data is available in the logical channel, or SL-CSI reporting is triggered:

[0229] 2> If SL data is available in the logical channel used for sidelink discovery:

[0230] 3> If sl-BWP-DiscPoolConfig or sl-BWP-DiscPoolConfigCommon is configured according to TS 38.331 [5]:

[0231] 4> Select sl-DiscTxPoolSelected configured in sl-BWP-DiscPoolConfig or sl-BWP-DiscPoolConfigCommon for transmission of side link discovery messages.

[0232] 3> Otherwise:

[0233] 4>Select any resource pool among the configured resource pools.

[0234] 2> Otherwise, if SL data is available in the logical channel:

[0235] 3> If sl-HARQ-FeedbackEnabled is set to enabled for the logical channel:

[0236] 4> Select any resource pool among the resource pools that is configured with PSFCH resources, except the pool in sl-BWP-DiscPoolConfig or sl-BWP-DiscPoolConfigCommon (if configured).

[0237] 3> Otherwise:

[0238] 4>Select any resource pool except the pool in sl-BWP-DiscPoolConfig or sl-BWP-DiscPoolConfigCommon (if configured).

[0239] 2> Otherwise, if SL-CSI report is triggered:

[0240] 3>Select any resource pool except the pool in sl-BWP-DiscPoolConfig or sl-BWP-DiscPoolConfigCommon (if configured).

[0241] 2> Perform TX resource (re)selection check on the selected resource pool as specified in clause 5.22.1.2;

[0242] 2> If TX resource (re)selection is triggered due to TX resource (re)selection check:

[0243] 3> If one or more SL DRXs are configured in the destination UE receiving SL-SCH data:

[0244] 4> Indicate to the physical layer the SL DRX active time in the destination UE receiving SL-SCH data as specified in clause 5.28.2.

[0245] 3> The number of HARQ retransmissions is selected from the allowed number in sl-MaxTxTransNumPSSCH contained in sl-PSSCH-TxConfigList (if configured by RRC), and if configured by RRC, the allowed number overlaps in sl-MaxTxTransNumPSSCH indicated in sl-CBR-PriorityTxConfigList for the highest priority of the logical channels allowed on the carrier and the CBR measured by the lower layer according to clause 5.1.27 of TS38.215

[24] (if CBR measurement results are available) or the corresponding sl-defaultTxConfigIndex configured by RRC (if CBR measurement results are not available);

[0246] 3> select an amount of frequency resources within the range between sl-MinSubChannelNumPSSCH and sl-MaxSubChannelNumPSSCH contained in sl-PSSCH-TxConfigList (if configured by RRC), and if configured by RRC, the amount of frequency resources overlaps between sl-MinSubChannelNumPSSCH and sl-MaxSubChannelNumPSSCH indicated in sl-CBR-PriorityTxConfigList for the highest priority of the logical channels allowed on the carrier and the CBR measured by lower layers according to clause 5.1.27 of TS 38.215

[24] (if CBR measurement results are available) or the corresponding sl-defaultTxConfigIndex configured by RRC (if CBR measurement results are not available);

[0247] 3> If not configured by RRC, interUECoordinationScheme1Explicit or interUECoordinationScheme1Condition enables reception of preferred resource sets and non-preferred resource sets:

[0248] 4> If the upper layer configuration is based on random selection transmission:

[0249] 5> Randomly select time and frequency resources for a transmission opportunity from a resource pool occurring within the SL DRX active time of the destination UE as specified in Section 5.28.2 based on the amount of selected frequency resources and the remaining PDBs of SL data available in the logical channels allowed on the carrier, and the latency requirement for the triggered SL CSI report, and the destination UE is selected to indicate the above-mentioned SL DRX active time to the physical layer.

[0250] 4> Otherwise:

[0251] 5> Randomly select a time and frequency resource for a transmission opportunity from the resources indicated by the physical layer as specified in clause 8.1.4 of TS 38.214[7] occurring within the SLDRX activity time of the destination UE as specified in clause 5.28.2, based on the amount of selected frequency resources and the remaining PDBs of SL data available in the allowed logical channels on the carrier, and / or the latency requirement for triggered SL-CSI reporting, the destination UE being selected to indicate the above-mentioned SLDRX activity time to the physical layer.

[0252] …

[0253] 3> If one or more HARQ retransmissions are selected:

[0254] 4> If not configured by RRC, interUECoordinationScheme1Explicit or interUECoordinationScheme1Condition enables reception of preferred resource sets and non-preferred resource sets:

[0255] 5> if sensing or partial sensing based transmission is configured by upper layers and leaves available resources for more transmission opportunities in the resources indicated by the physical layer according to clause 8.1.4 of TS 38.214 [7]; or

[0256] 5> If random selection based transmission is configured by upper layers and leaves available resources in the resource pool for more transmission opportunities:

[0257] 6> randomly selecting time and frequency resources for one or more transmit opportunities from available resources occurring within the SL DRX active time as specified in clause 5.28.2 of the destination UE selected to indicate the above SL DRX active time to the physical layer, based on the amount of selected frequency resources, the selected number of HARQ retransmissions and the remaining PDBs of SL data available in the allowed logical channels on the carrier, and / or the latency requirement of the triggered SL-CSI, by ensuring a minimum time gap between any two selected resources if the PSFCH is configured for this resource pool and the retransmission resources may be indicated by the time resource assignment of the previous SCI in accordance with clause 8.3.1.1 of TS 38.212 [9];

[0258] 6> The transmission opportunity that occurs first in time is regarded as the initial transmission opportunity and the other transmission opportunities are regarded as retransmission opportunities;

[0259] 6> Treat all transmit opportunities as granted by the selected side link.

[0260] …

[0261] 4> Use randomly selected resources to select a periodic set of resources separated by a resource reservation interval for the transmission of PSCCH and PSSCH corresponding to the number of retransmission opportunities of the MAC PDU determined in TS 38.214 [7];

[0262] 4> The first transmission opportunity set is regarded as an initial transmission opportunity, and the other transmission opportunity set is regarded as a retransmission opportunity;

[0263] 4> Consider the initial transmit opportunity set and the retransmit opportunity set as selected sidelink grants.

[0264] 3> Otherwise:

[0265] 4> Treat the set as the selected sidelink grant.

[0266] 3> According to TS 38.214 [7], the PSCCH duration and PSSCH duration are determined using the selected sidelink grant.

[0267] 1> If the selected sidelink grant is available for retransmission of a positively acknowledged MAC PDU as specified in clause 5.22.1.3.3:

[0268] 2> Clear the PSCCH duration and PSSCH duration corresponding to the retransmission of the MAC PDU from the selected sidelink grant.

[0269] The MAC entity shall, for each PSSCH duration:

[0270] 1> For each side link grant occurring during this PSSCH duration:

[0271] 2> Select the MCS table allowed in the resource pool associated with the sidelink grant;

[0272] NOTE 4a: If more than one MCS table is configured, the MCS table selection is determined by the UE implementation.

[0273] 2> If the MAC entity has been configured with sidelink resource allocation mode 1:

[0274] 3> Select MCS (if configured) within the range configured by RRC between sl-MinMCS-PSSCH and sl-MaxMCS-PSSCH associated with the selected MCS table contained in sl-ConfigDedicatedNR;

[0275] 3> Set the resource reservation interval to 0ms.

[0276] 2> Otherwise:

[0277] 3> If the MAC entity decides not to use the selected sidelink grant for the next PSSCH duration corresponding to the initial transmit opportunity:

[0278] 4> Set the resource reservation interval to 0ms.

[0279] 3> Otherwise:

[0280] 4>Set the resource reservation interval to the selected value.

[0281] 2> If the configured sidelink grant is activated and this PSSCH duration corresponds to the first PSSCH transmit opportunity within this sl-PeriodCG of the configured sidelink grant:

[0282] 3> Set the HARQ process ID to the HARQ process ID associated with this PSSCH duration and all subsequent PSSCH durations (if applicable) occurring in this sl-PeriodCG for configured sidelink grants;

[0283] 3> Determine the duration of this PSSCH for initial transmission;

[0284] 3>Flush the HARQ buffer of the side link process associated with the HARQ process ID.

[0285] 2> During this PSSCH duration, the sidelink grant, selected MCS and associated HARQ information are delivered to the sidelink HARQ entity.

[0286] For a configured sidelink grant, the HARQ process ID associated with the first slot of a SL transmission is derived from the following equation:

[0287] HARQ process ID=[floor(CURRENT_slot / PeriodicitySL)]modulo sl-NrOfHARQ-Processes+sl-HARQ-ProcID-offset

[0288] Where CURRENT_slot refers to the current logical slot in the associated resource pool and PeriodicitySL is defined in clause 5.8.3.

[0289] 5.22.1.3 Sidelink HARQ Operation

[0290] 5.22.1.3.1 Sidelink HARQ Entity

[0291] The MAC entity includes at most one sidelink HARQ entity for transmission on the SL-SCH, which maintains several parallel sidelink processes.

[0292] The maximum number of transmitting sidelink processes associated with a sidelink HARQ entity is 16. A sidelink process may be configured to transmit multiple MAC PDUs. To transmit multiple MAC PDUs in sidelink resource allocation mode 2, the maximum number of transmitting sidelink processes associated with a sidelink HARQ entity is 4.

[0293] The delivered sidelink grant and its associated sidelink transmission information are associated with the sidelink process. Each sidelink process supports one TB.

[0294] For each sidelink grant, the sidelink HARQ entity shall:

[0295] 1> if the MAC entity determines that the sidelink is granted for initial transmission as specified in clause 5.22.1.1; or

[0296] 1> if the sidelink grant is a configured sidelink grant and no MAC PDU is obtained in the sl-PeriodCG of the configured sidelink grant; or

[0297] 1> If the sidelink grant is a dynamic sidelink grant or a selected sidelink grant and no MAC PDU was obtained in the previous sidelink grant when the PSCCH duration and level 2 SCI on the PSSCH of the previous sidelink grant are not within the SL DRX active time as specified in clause 5.28.1 of the destination with data to be sent:

[0298] Note 1: Void.

[0299] 2> (Re)associate the sidelink process to this grant, and for the associated sidelink process:

[0300] 2> If all PSCCH durations and PSSCH durations for initial transmission of a MAC PDU for a dynamic sidelink grant or a configured sidelink grant are not within the SL DRX Active Time as specified in clause 5.28.1 of a destination with data to be sent:

[0301] 3> Ignore sidelink grant.

[0302] 3> Obtain MAC PDU for transmission from the multiplexing and assembly entity (if any);

[0303] 3> If the MAC PDU to be transmitted has been obtained:

[0304] 4> If HARQ process ID has been set for sidelink grant:

[0305] 5> (re)associate the HARQ process ID corresponding to the sidelink grant to the sidelink process.

[0306] 4> Determine the sidelink transmission information of the TB for the source and destination pair of the MAC PDU as follows:

[0307] 5> Set the source layer 1 ID to the 8LSB of the source layer 2 ID of the MAC PDU;

[0308] 5> Set the destination layer 1 ID to the 16LSB of the destination layer 2 ID of the MAC PDU;

[0309] 5> (re)associate the sidelink process to the sidelink process ID;

[0310] 5> consider that the NDI has been converted compared to the previously transmitted value corresponding to the side link identification information and the side link process ID of the MAC PDU, and set the NDI to the converted value;

[0311] 5> Set the broadcast type indicator to one of broadcast, multicast and unicast indicated by the upper layer;

[0312] 5> if HARQ feedback is enabled for the MAC PDU according to clause 5.22.1.4.2;

[0313] 6> Set the HARQ feedback enable / disable indicator to enabled.

[0314] 5> Otherwise:

[0315] 6> Set the HARQ feedback enable / disable indicator to disabled.

[0316] 5> Set the priority to the highest priority value of the logical channel (if any) and MACCE (if included) in the MAC PDU;

[0317] ...5>Set the redundancy version to the selected value.

[0318] 4> Deliver the TB's MAC PDU, sidelink grant and sidelink transmission information to the associated sidelink process;

[0319] 4> Instruct the associated side link process to trigger a new transmission.

[0320] 3> Otherwise:

[0321] 4>Flush the HARQ buffer of the associated side link process.

[0322] 1> Otherwise (i.e., retransmit):

[0323] 2> if the HARQ process ID corresponding to the sidelink grant received on the PDCCH, the configured sidelink grant or the selected sidelink grant is associated to a sidelink process whose HARQ buffer is empty; or

[0324] 2> if the HARQ process ID corresponding to the sidelink grant received on the PDCCH is not associated to any sidelink process; or

[0325] 2> If the PSCCH duration and PSSCH duration for one or more retransmissions of a MAC PDU for a dynamic sidelink grant or a configured sidelink grant are not within the SL DRX Active Time as specified in clause 5.28.1 of the destination having data to be sent:

[0326] 3> Ignore sidelink grant.

[0327] 2> Otherwise:

[0328] 3> Identify the side link process associated with this grant, and for the associated side link process:

[0329] 4> Deliver the sidelink grant of the MAC PDU to the associated sidelink process;

[0330] 4> Instruct the associated side link process to trigger retransmission.

[0331] 5.22.1.3.1a Sidelink Process

[0332] A sidelink process is associated with a HARQ buffer.

[0333] New transmissions and retransmissions are performed with the MCS selected as specified in clauses 8.1.3.1 and 5.22.1.1 of TS 38.214 [7] for the resources indicated in the sidelink grant specified in clause 5.22.1.1.

[0334] If the sidelink process is configured to perform transmission of multiple MAC PDUs with sidelink resource allocation mode 2, the process maintains a counter SL_RESOURCE_RESELECTION_COUNTER. For other configurations of the sidelink process, this counter is not available.

[0335] The priority of a MAC PDU is determined by the highest priority of the logical channel or MAC CE in the MAC PDU.

[0336] If the sidelink HARQ entity requests a new transmission, the sidelink process shall:

[0337] 1>Store the MAC PDU in the associated HARQ buffer;

[0338] 1>Store the sidelink grant received from the sidelink HARQ entity;

[0339] 1> Generate a transfer as described below.

[0340] If the sidelink HARQ entity requests a retransmission, the sidelink process shall:

[0341] 1>Store the sidelink grant received from the sidelink HARQ entity;

[0342] 1> Generate a transfer as described below.

[0343] To generate a transmission, the sidelink process shall:

[0344] 1> if there is no uplink transmission; or

[0345] 1> if the MAC entity is capable of performing both uplink transmission and sidelink transmission at the same time when transmitting; or

[0346] 1> if the other MAC entity and the MAC entity are respectively capable of performing uplink transmission and sidelink transmission simultaneously when transmitting; or

[0347] 1> If there are MAC PDUs transmitted in the uplink for this duration, except for MAC PDUs obtained from the Msg3 buffer, MSGA buffer or prioritized as specified in clause 5.4.2.2, and sidelink transmissions take precedence over uplink transmissions:

[0348] 2> instruct the physical layer to transmit the SCI along with the associated sidelink transmission information according to the stored sidelink grant;

[0349] 2> Instruct the physical layer to generate transmission according to the stored side link grant;

[0350] 2> If HARQ feedback is enabled for the MAC PDU according to clause 5.22.1.4.2:

[0351] 3> Instruct the physical layer to monitor the PSFCH for transmission and perform PSFCH reception as specified in clause 5.22.1.3.2.

[0352] 2> If sl-PUCCH-Config is configured by RRC for the stored sidelink grant:

[0353] 3> Determine the transmission of the acknowledgment on the PUCCH as specified in clause 5.22.1.3.2.

[0354] 1> If this transmission corresponds to the last transmission of a MAC PDU:

[0355] 2>Decrement SL_RESOURCE_RESELECTION_COUNTER by 1 (if applicable).

[0356] 5.22.1.4 Reuse and assembly

[0357] For a PDU associated with one SCI, the MAC shall consider only the logical channels with a source Layer 2ID - destination Layer 2ID pair for one of unicast, multicast and broadcast associated with the same pair.Multiple transmissions for different sidelink processes are allowed to be performed independently in different PSSCH durations.

[0358] NOTE: Sidelink discovery and sidelink data transmitted by the UE cannot be multiplexed into the same TB because they are always associated with different destination L2 IDs.

[0359] 5.22.1.4.1 Logical channel prioritization

[0360] 5.22.1.4.1.1 Overview

[0361] The sidelink logical channel prioritization procedure is applied whenever a new transmission is performed.

[0362] RRC controls the scheduling of sidelink data by signaling for each logical channel:

[0363] -sl-Priority, where increasing priority values ​​indicate lower priority;

[0364] -sl-PrioritisedBitRate, which sets the sidelink prioritized bit rate (sidelinkPrioritized Bit Rate, sPBR);

[0365] -sl-BucketSizeDuration, which sets the sidelink bucket size duration (sBSD).

[0366] The RRC additionally controls the LCP procedure by configuring mapping restrictions for each logical channel:

[0367] -sl-configuredGrantType1Allowed, which sets whether configured grant type 1 can be used for sidelink transmissions;

[0368] -sl-AllowedCG-List which sets the allowed configured grants for sidelink transmission;

[0369] -sl-HARQ-FeedbackEnabled, which sets whether the logical channel is allowed to be multiplexed with the logical channel when sl-HARQ-FeedbackEnabled is set to enabled or disabled.

[0370] 5.22.1.4.1.2 Logical channel selection

[0371] For each SCI corresponding to a new transmission, the MAC entity shall:

[0372] 1> If sl-BWP-DiscPoolConfig or sl-BWP-DiscPoolConfigCommon is configured according to TS 38.331 [5]:

[0373] …

[0374] 1> Otherwise:

[0375] 2> Select a destination associated with one of unicast, multicast, and broadcast, which is in the SL active time of the SL transmit opportunity if SLDRX is applied to the destination, and has a MACCE and at least one of the logical channels with the highest priority, among the logical channels that meet all of the following conditions of the SL grant associated with the SCI and the MAC CE (if present):

[0376] 3>SL data is available for transmission; and

[0377] 3> SBj>0 in the presence of any logical channel such that SBj>0; and

[0378] 3>sl-configuredGrantType1AllowedIf configured, set to true if the SL grant is a configured grant type 1; and

[0379] 3>sl-AllowedCG-List, if configured, contains the configured grant index associated with the SL grant; and

[0380] 3> If PSFCH is not configured for the SL grant associated with the SCI, then sl-HARQ-FeedbackEnabled is set to disabled.

[0381] 1> Select a logical channel that satisfies all of the following conditions among the logical channels belonging to the selected destination:

[0382] 2>SL data is available for transmission; and

[0383] 2>sl-configuredGrantType1Allowed if configured is set to true if the SL grant is a configured grant type 1; and

[0384] 2>sl-AllowedCG-List, if configured, contains the configured grant index associated with the SL grant; and

[0385] 3> If PSFCH is configured for sidelink grant associated with SCI:

[0386] 4> If sl-HARQ-FeedbackEnabled is set to enabled for the highest priority logical channel that meets the above conditions, then sl-HARQ-FeedbackEnabled is set to enabled; or

[0387] 4> If sl-HARQ-FeedbackEnabled is set to disabled for the highest priority logical channel that meets the above conditions, then sl-HARQ-FeedbackEnabled is set to disabled.

[0388] 3> Otherwise:

[0389] 4>sl-HARQ-FeedbackEnabled is set to disabled.

[0390] 5.22.1.4.1.3 Allocation of sidelink resources

[0391] For each SCI corresponding to a new transmission, the MAC entity shall:

[0392] 1> Allocate resources to logical channels as follows:

[0393] 2> Logical channels selected for SL grant under SBj>0 in clause 5.22.1.4.1.2 are allocated resources in descending priority order. If the sPBR of a logical channel is set to infinity, the MAC entity shall allocate resources for all data available for transmission on the logical channel before satisfying the sPBR of lower priority logical channels;

[0394] 2> Decrease SBj by the total size of the MAC SDU serving the above logical channel j;

[0395] 2> If any resources remain, all logical channels selected in clause 5.22.1.4.1.2 are served in strictly descending priority order (regardless of the value of SBj) until the data for the logical channel or the SL grant is exhausted (whichever occurs first). Logical channels configured with the same priority should receive the same service.

[0396] Note: The value of SBj can be negative.

[0397] The UE shall also follow the following rules during the above SL scheduling procedure:

[0398] - The UE shall not segment an RLC SDU (or a partially transmitted SDU or a retransmitted RLC PDU) if the entire SDU (or a partially transmitted SDU or a retransmitted RLC PDU) fits into the remaining resources of the associated MAC entity;

[0399] - If the UE segments an RLC SDU from a logical channel, it shall maximize the size of the segments to fill as much as possible the grant of the associated MAC entity;

[0400] -UE should maximize the delivery of data;

[0401] - If a sidelink grant size equal to or greater than 12 bytes is provided to the MAC entity, and data is available and allowed to be transmitted (as per clause 5.22.1.4.1), then the MAC entity shall not transmit only padding;

[0402] - A logical channel configured with sl-HARQ-FeedbackEnabled set to enabled and a logical channel configured with sl-HARQ-FeedbackEnabled set to disabled cannot be multiplexed into the same MAC PDU.

[0403] The MAC entity shall not generate a MAC PDU for the HARQ entity if the following conditions are met:

[0404] - there is no sidelink CSI reporting MAC CE generated for this PSSCH transmission as specified in clause 5.22.1.7; and

[0405] - there is no sidelink DRX command MAC CE generated for this PSSCH transmission as specified in clause 5.22.1.8; and

[0406] - there is no sidelink inter-UE coordination request MAC CE generated for this PSSCH transmission as specified in clause 5.22.1.9; and

[0407] - there is no sidelink inter-UE coordination information MAC CE generated for this PSSCH transmission as specified in clause 5.22.1.10; and

[0408] -The MAC PDU contains zero MAC SDUs.

[0409] Logical channels shall be prioritized according to the following order (highest priority first):

[0410] - Data from SCCH;

[0411] -Sidelink CSI reporting MAC CE;

[0412] -Sidelink inter-UE coordination request MAC CE and sidelink inter-UE coordination report MAC CE;

[0413] -Sidelink DRX Command MAC CE;

[0414] - Data from any STCH.

[0415] 5.22.1.4.2 Multiplexing of MAC Control Elements and MAC SDUs

[0416] The MAC entity shall multiplex MAC CE and MAC SDU in the MAC PDU according to clauses 5.22.1.4.1 and 6.1.6.

[0417] 5.22.2 SL-SCH data reception

[0418] 5.22.2.1 SCI reception

[0419] The SCI indicates whether there is a transmission on the SL-SCH and provides related HARQ information. The SCI consists of two parts: level 1 SCI on the PSCCH and level 2 SCI on the PSSCH, as specified in clause 8.1 of TS 38.214 [7].

[0420] The MAC entity shall:

[0421] 1> For each PSCCH duration during which the MAC entity monitors the PSCCH:

[0422] 2> If level 1 SCI has been received on PSCCH:

[0423] 3> determining a set of PSSCH durations in which the received portion of the SCI is used for reception of level 2 SCI and transport blocks;

[0424] 3> If a Level 2 SCI has been received on PSSCH for this PSSCH duration:

[0425] 4> storing the SCI as a SCI valid for the PSSCH duration corresponding to the transmission of the transport block and the associated HARQ information and QoS information;

[0426] 1> For each PSSCH duration in which the MAC entity has a valid SCI:

[0427] 2> Deliver the SCI and associated sidelink transmission information to the sidelink HARQ entity.

[0428] 5.22.2.2 Sidelink HARQ Operation

[0429] 5.22.2.2.1 Sidelink HARQ Entity

[0430] There is at most one sidelink HARQ entity at the MAC entity for reception of SL-SCH, which maintains several parallel sidelink processes.

[0431] Each sidelink process is associated with an SCI in which the MAC entity is interested. This interest is determined by the sidelink identification information of the SCI. The sidelink HARQ entity directs the sidelink transmission information and associated TBs received on the SL-SCH to the corresponding sidelink process.

[0432] The number of receive sidelink processes associated with a sidelink HARQ entity is defined in TS 38.306 [5].

[0433] For each PSSCH duration, the sidelink HARQ entity shall:

[0434] 1> For each SCI valid during this PSSCH duration:

[0435] 2> If NDI has toggled compared to the value of the previously received transmission corresponding to the sidelink identification information and sidelink process ID of the SCI, or this is the first received transmission for the sidelink identification information and sidelink process ID pair of the SCI:

[0436] 3> If there is a side link process associated with the side link identification information and side link process ID of the SCI:

[0437] 4> The side link process is considered not to be occupied;

[0438] 4> Refresh the soft buffer of the side link process.

[0439] 3> Allocate the TB received from the physical layer and the associated side link identification information and side link process ID to an unoccupied side link process;

[0440] 3> Associate the side link process with the side link identification information and side link process ID of this SCI, and treat this transmission as a new transmission.

[0441] 1> For each side link process:

[0442] 2> If, for a sidelink process, according to its associated SCI, the NDI has not yet transformed compared to the previously received transmitted value corresponding to the sidelink identification information of the SCI and the sidelink process ID:

[0443] 3> Allocate the TB received from the physical layer to the sidelink process and treat this transmission as a retransmission.

[0444] 5.22.2.2.2 Sidelink Process

[0445] For each PSSCH duration in which a transmission occurs for the sidelink process, one TB and associated HARQ information are received from the sidelink HARQ entity.

[0446] For each received TB and associated sidelink transmission information, the sidelink process shall:

[0447] 1> If this is a new transmission:

[0448] 2>Try to decode the received data.

[0449] 1> Otherwise, if this is a retransmission:

[0450] 2> If data for this TB has not been successfully decoded:

[0451] 3> Instructs the physical layer to combine the received data with the data currently in the soft buffer for this TB and attempt to decode the combined data.

[0452] 1> if the data that the MAC entity attempted to decode was successfully decoded for this TB; or

[0453] 1> If data for this TB was previously successfully decoded:

[0454] 2> If this is the first successful decode for this TB of data:

[0455] 3> If this TB is associated to unicast, the DST field of the decoded MAC PDU subheader is equal to the 8MSBs of any source layer 2 ID of the UE, of which the 16LSBs are equal to the destination ID in the corresponding SCI, and the SRC field of the decoded MAC PDU subheader is equal to the 16MSBs of any destination layer 2 ID of the UE, of which the 8LSBs are equal to the source ID in the corresponding SCI; or

[0456] 3> If this TB is associated to multicast or broadcast, and the DST field of the decoded MAC PDU subheader is equal to the 8MSBs of any destination layer 2 ID of the UE, where the 16LSBs are equal to the destination ID in the corresponding SCI:

[0457] 4> Deliver the decoded MAC PDU to the decomposition and demultiplexing entity;

[0458] 2> The side link process is considered not to be occupied.

[0459] 1> Otherwise:

[0460] 2> Instruct the physical layer to replace the data for this TB in the soft buffer with the data that the MAC entity is attempting to decode.

[0461] 5.22.2.3 Demultiplexing and demultiplexing

[0462] The MAC entity shall demultiplex and demultiplex MAC PDUs as defined in clause 6.1.6.

[0463] In [2] R1-2308756, Editor's Summary of SL-U's Draft CR 37.213, the following reference is made to the channeling procedures for unlicensed spectrum.

[0464] 4 Channel Access Procedure

[0465] 4.0 Overview

[0466] Unless otherwise indicated, the following definitions apply to the terms used hereinafter in this specification:

[0467] - A channel refers to a carrier or a part of a carrier, consisting of a set of contiguous resource blocks (RBs) on which a channel access procedure is performed in a shared spectrum.

[0468] - The channel access procedure is a sensing-based procedure to assess the availability of a channel for performing transmissions. The basic unit for sensing is a sensing slot, which has a duration of T sl =9μs. The eNB / gNB or UE senses the channel during the sensing time slot duration and determines that the power detected for at least 4μs in the sensing time slot duration is less than the energy detection threshold X Thresh In the case of sl is considered idle. Otherwise, the sensing time slot lasts T sl Seen as busy.

[0469] - Channel occupancy refers to the transmission of the eNB / gNB / UE on the channel after performing the corresponding channel access procedure in this clause.

[0470] - Channel Occupancy Time means the total time that the eNB / gNB / UE and any eNB / gNB / UE sharing the channel occupancy perform transmissions on the channel after the eNB / gNB / UE performs the corresponding channel access procedure described in this clause. To determine the Channel Occupancy Time, in case of a transmission gap less than or equal to 25 μs, the gap duration is counted in the Channel Occupancy Time. The Channel Occupancy Time may be shared for transmissions between the eNB / gNB and the corresponding UE.

[0471] …

[0472] - A SL transmit burst is defined as a set of SL transmits from a UE without any gaps greater than 16 μs. SL transmissions from a UE separated by gaps greater than 16 μs are considered separate SL transmit bursts. A UE may transmit a SL transmission after a gap within a SL transmit burst without sensing the availability of the corresponding channel.

[0473] 4.5 Sidelink channel access procedure

[0474] A UE operating in sidelink resource allocation mode 1 or mode 2 and performing SL transmission on a channel shall perform the procedures described in this clause for the UE to access the channel on which transmission is performed.

[0475] In this clause, transmissions from a UE are considered to be separate SL transmissions, whether or not there are gaps between transmissions, and X for sensing is adjusted as described in clause 4.5.5, if applicable. Thresh .

[0476] The UE may access a channel on which SL transmission is performed according to one of the Type 1 or Type 2 SL channel access procedures described in Sections 4.5.1 and 4.5.2, respectively.

[0477] When the UE applies the type 1 channel access procedure to transmit SL, the applicable channel access priority class (CAPC) is defined in Table 4.5-1.

[0478] When the UE applies the Type 1 channel access procedure to transmit a SL transmission containing a PSSCH with user plane data and associated PSCCH, the UE determines the corresponding SL channel access priority category p in Table 4.5-1 following the procedure described in clause 16.9.x.2 of [9].

[0479] When the UE applies Type 1 channel access procedure to transmit a SL transmission containing a PSFCH or S-SSB transmission, the UE shall use the channel access priority category p=1 in Table 4.5-1.

[0480] UE should not exceed T slm cot,p The channel occupancy time of the UE is transmitted on the channel, where the channel access procedure is performed based on the channel access priority category p associated with the UE transmission, as given in Table 4.5-1.

[0481] When the UE applies a type 1 channel access procedure to transmit a plurality of transport blocks (TBs) over a plurality of consecutive time slots, the type 1 channel access procedure is performed using a highest CAPC value among associated CAPC values ​​having the plurality of TBs.

[0482] If the UE fails to access the channel before the expected SL transmission, Layer 1 notifies higher layers of the channel access failure and the channel that the UE failed to access.

[0483] Table 4.5-1: Channel Access Priority Class (CAPC) for SL

[0484]

[0485] 4.5.1 Type 1SL channel access procedure

[0486] This clause describes a channel access procedure for a UE, where the duration spanned by a sensing slot sensed as idle prior to a SL transmission is random. The clause is applicable to SL transmissions containing at least any one of PSSCH / PSCCH or PSFCH or S-SSB.

[0487] The UE may delay for a duration T d The transmission is transmitted using a Type 1 channel access procedure after the channel is first sensed as idle during a sensing slot duration of and after the counter N is zero in step 4. The counter N is adjusted by sensing the channel for additional slot durations according to the steps described below.

[0488] 1) Set N = N init , where N init is evenly distributed between 0 and CW p A random number between , and go to step 4;

[0489] 2) If > 0 and the UE chooses to decrement the counter, then set N = N-1;

[0490] 3) Sense the channel for the additional time slot duration, and if the additional time slot duration is idle, go to step 4; otherwise, go to step 5;

[0491] 4) If N=0, then stop; otherwise, go to step 2.

[0492] 5) Sense the channel until the additional delay duration T d A busy sensing time slot is detected within the time limit or an additional delay duration T is detected. d All sensing time slots are idle;

[0493] 6) If the additional delay duration T d If the channel is sensed to be idle during all time slot durations, then go to step 4; otherwise, go to step 5;

[0494] If the UE has not yet transmitted an SL transmission on the channel on which the SL transmission is performed after step 4 in the above procedure, then the UE shall transmit the SL transmission at least for the sensing slot duration T when the UE is ready to transmit the transmission. sl The channel is sensed to be idle in the transmission, and the delay duration T immediately before the transmission d If the channel has been sensed to be idle during all sensing time slot durations of T, the UE may transmit on the channel. If the UE senses the channel for the first time after it is ready to transmit, the UE may transmit on the channel during the sensing time slot duration T. slThe channel has not been sensed to be idle in the delay period T immediately before the scheduled transmission. d If the channel is not sensed to be idle during any sensing time slot duration, the UE will delay for a duration of T d After sensing that the channel is idle during the sensing time slot duration, go to step 1.

[0495] Delay duration T d By duration T f =16μs followed by m p The duration of each sensing time slot is T sl =9μs, and T f In T f The beginning of contains the idle sensing time slot duration T sl .

[0496] CW min,p ≤CW p ≤CW max,p is the contention window. CW is described in clause 4.5.4 p Adjustment.

[0497] Select CW before step 1 in the above procedure min,p and CW max,p .

[0498] m p , CW min,p and CW max,p is based on the channel access priority category p as shown in Table 4.5-1.

[0499] 4.5.2 Type 2 SL channel access procedure

[0500] This clause describes the channel access procedure of the UE, where the duration spanned by the sensing slots sensed as idle before SL transmission is determined.

[0501] The Type 2A SL channel access procedure as described in clause 4.5.2.1 applies to the following transmissions performed by the UE:

[0502] - If the UE intends to transmit a SL transmission at least 25 μs after a SL transmission by another UE in shared channel occupancy as described in clause 4.5.3, the UE uses Type 2A SL channel access procedure for the SL transmission.

[0503] - If the UE intends to transmit only S-SSB in transmissions where the duration of the S-SSB transmission is at most 1 ms in a duty cycle of at most 1 / 20, then the UE uses Type 2A SL channel access procedure for SL transmission.

[0504] When the UE initiates channel occupation on a channel to transmit SL transmission within the channel occupation, if the UE stops transmission on the channel, then if the UE continues to sense that the channel is idle before re-initiating transmission, the UE may restart SL transmission within the channel occupation on the channel after performing the Type 2A channel access procedure as described in Section 4.5.2.1.

[0505] The Type 2B or Type 2C SL channel access procedures as described in clauses 4.5.2.2 and 4.5.2.3, respectively, apply to transmissions performed by the UE after a gap of 16 μs or at most 16 μs, respectively, in shared channel occupancy as described in clause 4.5.3.

[0506] 4.5.2.1 Type 2A SL channel access procedure

[0507] When the UE uses the Type 2A SL channel access procedure for transmission, the UE may immediately short_sl =25μs after sensing that the channel is idle. Interval T short_sl By duration T f = 16μs followed by a sensing time slot, and T f In T f The beginning of contains the sensing time slot. If T short_sl If both of the sensing time slots are sensed as idle, the channel is considered to be in T short_sl The inside is free.

[0508] 4.5.2.2 Type 2B SL channel access procedure

[0509] When the UE uses the Type 2B SL channel access procedure for transmission, the UE may f The transmission is transmitted after sensing that the channel is idle within a duration of T = 16 μs. f Included in T f The sensing time slot occurs within the last 9us of the

[0510] If the channel is sensed as idle for a total of at least 5 us and sensing is performed for at least 4 us in the sensing time slot, then the channel is idle for duration T f is considered idle.

[0511] 4.5.2.3 Type 2C SL channel access procedure

[0512] When the UE uses the Type 2C SL channel access procedure for transmission, the UE does not sense the channel before transmission. The duration of the corresponding SL transmission is at most 584us.

[0513] 4.5.3 SL channel access procedure during shared channel occupation

[0514] When a UE initiates channel occupancy on a channel using the channel access procedure described in Section 4.5.1 to transmit a SL transmission, the UE may provide channel occupancy sharing information in the SL control information, including at least a layer 1 source ID and a destination ID, a corresponding channel access priority category, a remaining channel occupancy duration, and frequency domain information of an applicable RB set for channel occupancy. The channel occupancy sharing information may also include an additional ID and an associated broadcast type. The additional ID includes a pair of layer 1 source IDs and destination IDs for all broadcast types, where the source ID is set to the source ID of the UE that initiated the channel occupancy for unicast and is set to a reserved bit for groupcast and broadcast. The channel occupancy sharing information transmitted in time slot n may indicate the remaining channel occupancy duration in a number of time slots K. If K=0, the channel occupancy initiated by the UE for SL transmission should not be shared by other UEs. Otherwise, the channel occupancy initiated by the UE for SL transmission may be shared by other UEs for a duration starting from the end of time slot n and ending at time slot n+K.

[0515] In the case when the UE transmits SL transmission in a shared channel occupancy initiated by the UE, the channel access priority category value corresponding to the SL transmission is at most equal to the channel access priority category value provided by the channel access priority category in the channel occupancy sharing information.

[0516] When a UE initiates channel occupation to transmit a SL transmission within a RB set and provides channel occupation sharing information for a unicast PSCCH / PSSCH transmission within the RB set, if the destination ID and source ID in the corresponding SL control information match the source ID and destination ID in the PSCCH / PSSCH transmission carrying the channel occupation information or match an additional pair of source ID and destination ID, respectively, and the associated broadcast type (if provided by the channel occupation sharing information) and the corresponding COT shared broadcast type indicate a value of '10' for a unicast broadcast type, then another UE may transmit the unicast PSCCH / PSSCH transmission sharing the initiated channel occupation within the RB set. If the destination ID in the corresponding SL control information matches the additional destination ID, and the associated broadcast type (if provided by the channel occupation sharing information) and the corresponding COT shared broadcast type indicate a value of '00' or '01' for a groupcast or broadcast broadcast type, respectively, then another UE may transmit the multicast or broadcast PSCCH / PSSCH transmission sharing the initiated channel occupation within the RB set.

[0517] When a UE initiates channel occupation to transmit a SL transmission within a RB set and provides channel occupation sharing information for a multicast or broadcast PSCCH / PSSCH transmission within the RB set, if the destination ID in the corresponding SL control information matches the destination ID in the multicast or broadcast PSCCH / PSSCH transmission carrying the channel occupation sharing information or matches an additional destination ID, and the associated broadcast type (if provided by the channel occupation sharing information) and the corresponding COT shared broadcast type indicate a value of '00' or '01' for the multicast or broadcast broadcast type, respectively, then another UE may transmit the shared multicast or broadcast PSCCH / PSSCH transmission with the initiated channel occupation within the RB set. If the destination ID and source ID in the corresponding SL control information match a pair of additional source ID and destination ID, and the associated broadcast type (if provided by the channel occupation sharing information) and the corresponding COT shared broadcast type indicate a value of '10' for the unicast broadcast type, then another UE may transmit the shared unicast PSCCH / PSSCH transmission with the initiated channel occupation within the RB set.

[0518] When a UE initiates channel occupancy to transmit a SL transmission within a RB set and provides channel occupancy sharing information for a PSSCH / PSCCH transmission within the RB set, another UE may transmit an S-SSB transmission sharing the initiated channel occupancy within the RB set.

[0519] When a UE initiates channel occupancy to transmit SL transmission within an RB set and provides channel occupancy sharing information for PSSCH / PSCCH transmission within the RB set, if at least one of the PSFCH transmissions is intended for the UE that initiated the channel occupancy, then another UE may transmit within the RB set sharing the PSFCH transmission whose channel occupancy was initiated.

[0520] If a UE shares channel occupation initiated on a channel by another UE using the channel access procedure described in clause 4.5.1 to transmit a SL transmission, then the UE may transmit a SL transmission subsequent to a SL transmission made after a transmission gap by the UE that initiated the channel occupation as follows:

[0521] - If the transmission gap is at least 25 μs, the UE may transmit a SL transmission on the channel after performing a Type 2A channel access procedure as described in clause 4.5.2.1.

[0522] - If the transmission gap is 16 μs, the UE may transmit a SL transmission on the channel after performing a Type 2B channel access procedure as described in clause 4.5.2.2.

[0523] - If the transmission gap is at most 16 μs, the UE may transmit a SL transmission on the channel after performing a Type 2C channel access as described in clause 4.5.2.3.

[0524] When a UE initiates channel occupancy using a channel access procedure to transmit a SL transmission and shares the corresponding channel occupancy with another UE transmitting the SL transmission, the UE may transmit the SL transmission within its channel occupancy subsequent to the SL transmission sharing the initiated channel occupancy, as follows.

[0525] - If the UE determines a transmission gap from another UE's SL transmission, then the following applies:

[0526] - If the transmission gap is at least 25 μs, the UE may transmit a SL transmission on the channel after performing a Type 2A channel access procedure as described in clause 4.5.2.1.

[0527] - If the transmission gap is 16 μs, the UE may transmit a SL transmission on the channel after performing a Type 2B channel access procedure as described in clause 4.5.2.2.

[0528] - If the transmission gap is at most 16 μs, the UE may transmit a SL transmission on the channel after performing a Type 2C channel access as described in clause 4.5.2.3.

[0529] - Otherwise, the UE may transmit a SL transmission on the channel after performing a Type 2A channel access procedure as described in clause 4.5.2.1.

[0530] …

[0531] 4.5.5 Energy detection threshold adaptation procedure

[0532] A UE accessing a channel where SL transmission is performed shall set the energy detection threshold (X Thresh ) is set to be less than or equal to the maximum energy detection threshold X Thresh_max .

[0533] OK X Thresh_max ,as follows:

[0534] - If the UE is configured with the higher layer parameter sl-maxEnergyDetectionThreshold-r18,

[0535] -X Thresh_max Set equal to the value passed via the higher layer parameter;

[0536] -otherwise

[0537] - The UE shall determine X′ according to the procedure described in clause 4.5.5.1 Thresh_max .

[0538] - If the UE is configured with the higher layer parameter sl-energyDetectionThresholdOffset-r18

[0539] - By adjusting X' according to the offset value transmitted by the higher layer parameters Thresh_max To set X Thresh_max ;

[0540] -otherwise

[0541] -UE should set X Thresh_max =X′ Thresh_max .

[0542] If the higher layer parameter sl-absenceOfAnyOtherTechnology-r18 is not configured for the UE and the higher layer parameter ue-toUE-COT-SharingED-Threshold is configured for the UE, the UE shall use the UE's transmit power when determining the resulting energy detection threshold ue-toUE-COT-SharingED-Threshold.

[0543] For the case where the UE performs the channel access procedure as described in clause 4.5.1 for SL transmission and indicates channel occupancy sharing information, X Thresh_max Set equal to the value provided by the higher layer parameter ue-toUE-COT-SharingED-Threshold (if provided).

[0544] 4.5.5.1 Preset Maximum Energy Detection Threshold Calculation Procedure

[0545] If the higher layer parameter sl-absenceOfAnyOtherTechnology-r18 is provided

[0546] - in

[0547] -X r Yes is the maximum energy detection threshold defined by regulatory requirements when such requirements have been defined, otherwise X r =T max +10dB

[0548] otherwise

[0549] -

[0550] in

[0551] - If the Type 2A SL channel access procedure is performed for a SL transmission that occurs outside of shared channel occupancy and contains only S-SSB as described in 4.5.2, then T A =5dB; otherwise T A =10dB;

[0552] -P H =23dBm;

[0553] -P TX Set to P as defined in [3] CMAX_H,c The value of

[0554] -T max (dBm) = 10·log10(3.16228·10 -8 (mW / MHz)·BWMHz(MHz));

[0555] -BWMHz is the single channel bandwidth in MHz.

[0556] If the channel on which the UE performs SL transmission overlaps with the LAA Scell ​​on the channel or the channel on which the gNB / UE performs DL / UL transmission, then the higher layer parameter sl-absenceOfAnyOtherTechnology-r18 is not expected to be provided.

[0557] When running the CR of TS 38.214 ([3]R1-2308720, Introduction of Specification Enhancements for NR Sidelink Evolution), the following content is provided.

[0558] 8 Physical side link shared channel related procedures

[0559] The UE may be configured by higher layers to have one or more sidelink resource pools. A sidelink resource pool may be used for transmission of PSSCH, as described in clause 8.1, or for reception of PSSCH, as described in clause 8.3, and may be associated with sidelink resource allocation mode 1 or sidelink resource allocation mode 2.

[0560] In the frequency domain,

[0561] - If the higher layer parameter transmissionStructureForPSCCHandPSSCH is not provided or is set to 'contiguousRB', then the sidelink resource pool consists of sl-NumSubchannel contiguous subchannels. A subchannel consists of sl-SubchannelSize contiguous PRBs, where sl-NumSubchannel and sl-SubchannelSize are higher layer parameters.

[0562] - If the higher layer parameter transmissionStructureForPSCCHandPSSCH is set to 'interlaceRB', then in the frequency domain the sidelink resource pool consists of sl-NumSubchannel subchannels, where each subchannel consists of numInterlacePerSubchannel interlaces with contiguous interlace indices.

[0563] For operation under shared spectrum channel access for frequency range 1, the sidelink resource pool may be (pre)configured to contain an integer number of RB sets. The UE may be configured with intra-cell guard bands according to the higher layer parameter intraCellGuardBandsSL-List. Only configured intra-cell guard bands PRBs between any two adjacent RB sets may be used for PSSCH transmission if and only if the UE has successfully performed a channel access procedure in both adjacent RB sets and the UE uses both of these RB sets for PSSCH transmission.

[0564] The set of time slots that can belong to the sidelink resource pool is denoted as in

[0565] -

[0566] - the slot index is relative to slot #0 of the radio frame corresponding to SFN 0 or DFN 0 of the serving cell,

[0567] - the set contains all time slots except the following time slots,

[0568] -N S-SSB time slot in which an S-SS / PSBCH block (S-SSB) or an additional transmission opportunity for an S-SSB is configured,

[0569] -N nonSL time slot, in each of which, according to the higher layer parameters tdd-UL-DL-ConfigurationCommon (if provided) or sl-TDD-Configuration (if provided) of the serving cell or sl-TDD-Config (if provided) of the received PSBCH, at least one of the Y, (Y+1), ..., (Y+X-1)th OFDM symbols is not semi-statically configured as UL, where Y and X are set by the higher layer parameters sl-StartSymbo and sl-LengthSymbols, respectively.

[0570] - Reserved time slots, which are determined by the following steps.

[0571] ●1) Exclude N from the set of all time slots S-SSB Time slot and NnonSL The remaining time slots are indicated in increasing order of time slot index.

[0572] ●2) If Then the time slot l r (0≤r<10240×2 μ -N S-SSB -N nonSL ) belongs to the reserved time slot, where m=0,1,…,N reserved -1 and N reserved =(10240×2 μ -N S-SSB -N nonSL )modL bitmap , where L bitmap Indicates the length of the bitmap configured by higher layers.

[0573] - The time slots in a set are arranged in increasing order of time slot index.

[0574] The UE determines the set of time slots assigned to the sidelink resource pool as follows:

[0575] -Use the bitmap associated with the resource pool The length of the bitmap is L bitmap Configured by higher layers.

[0576] - If b k′ =1, then the time slot (0≤k<10240×2 μ -N S-SSB -N nonSL -N reserved ) belongs to the set, where k′=k mod L bitmap .

[0577] - The slots in the set are re-indexed so that the remaining slots The subscript i is a continuous {0,1,…,T′ max -1}, where T′ max is the number of time slots remaining in the set.

[0578] The UE determines the set of resource blocks allocated to the sidelink resource pool as follows:

[0579] -The resource block pool consists of N PRB PRB composition.

[0580] - If the higher layer parameter transmissionStructureForPSCCHandPSSCH is not provided, or is set to 'contiguousRB', then the subchannel m for m=0,1,...,numSubchannel-1 is composed of the subchannels j=0,1,...,n subCHsize -1 has physical resource block number n PRB =n subCHRBstart +m·n subCHsize +j connected resource blocks, where n subCHRBstart 、n subCHsize and numSubchannel are given by the higher layer parameters sl-StartRB-Subchannel, sl-SubchannelSize and sl-NumSubchannel respectively.

[0581] - If the higher layer parameter transmissionStructureForPSCCHandPSSCH is set to 'interlaceRB', then subchannel m for m = 0, 1, ..., numSubchannel-1 consists of a set of numInterlacePerSubchannel contiguous interlaces, where each interlace consists of at least 10 resource blocks as defined in clause 4.4.4.6 of [4, TS 38.211]. Subchannel m is indexed per RB set and periodically indexed across multiple RB sets within a resource pool. Subchannels with the same index are mapped to a set of numInterlacePerSubchannel interlaces with the same index in different RB sets. Subchannel #0 is mapped to interlaces 0 to numInterlacePerSubchannel-1, subchannel #1 is mapped to interlaces numInterlacePerSubchannel to numInterlacePerSubchannel*2-1, and so on.

[0582] The UE is not expected to use the last N PRB modn subCHsize PRB.

[0583] 8.1 UE procedures for transmitting the physical sidelink shared channel

[0584] Each PSSCH transmission is associated with a PSCCH transmission.

[0585] The PSCCH transmission carries the level 1 SCI associated with the PSSCH transmission; the level 2 associated SCI is carried within the resources of the PSSCH.

[0586] If a UE transmits SCI format 1-A on PSCCH according to the PSCCH resource configuration in slot n and PSCCH resource m, then for the associated PSSCH transmission in the same slot

[0587] - One transport block is transmitted using at most two layers;

[0588] - Determine the number of layers (υ) according to the 'Number of DMRS ports' field in the SCI;

[0589] - a set of consecutive symbols within a time slot used to transmit the PSSCH, determined in accordance with clause 8.1.2.1;

[0590] - Determine the set of contiguous or interleaved resource blocks used to transmit the PSSCH in accordance with clause 8.1.2.2;

[0591] The UE shall set the content of SCI format 2-A as follows:

[0592] - The UE shall set the value of the 'HARQ Process Number' field as instructed by higher layers.

[0593] - The UE shall set the value of the 'NDI' field as instructed by higher layers.

[0594] - The UE shall set the value of the 'Redundancy Version' field as indicated by higher layers.

[0595] - The UE shall set the value of the 'Source ID' field as instructed by higher layers.

[0596] - The UE shall set the value of the 'Destination ID' field as instructed by higher layers.

[0597] - The UE shall set the value of the 'HARQ Feedback Enable / Disable Indicator' field as indicated by higher layers.

[0598] - The UE shall set the value of the 'Broadcast Type Indicator' field as indicated by higher layers.

[0599] - The UE shall set the value of the 'CSI Request' field as instructed by higher layers.

[0600] [- The UE shall set the value of the 'CAPC' field as indicated by higher layers.

[0601] - The UE shall set the value of the 'COT Shared Broadcast Type' field as indicated by higher layers.

[0602] - The UE shall set the value of the 'COT Shared Additional ID' field as instructed by higher layers.

[0603] - The UE shall set the value of the 'Remaining COT Duration' field as indicated by higher layers.

[0604] …

[0605] 8.1.1 Transmission scheme

[0606] Only one transmission scheme is defined for PSSCH and is used for all PSSCH transmissions.

[0607] PSSCH transmission is performed through at most two antenna ports, where antenna ports 1000-1001 are defined in clause 8.2.4 of [4, TS38.211].

[0608] 8.1.2 Resource Allocation

[0609] In sidelink resource allocation mode 1:

[0610] - For PSSCH and PSCCH transmissions, dynamic grant, configured grant type 1 and configured grant type 2 are supported. Configured grant type 2 Sidelink transmissions are semi-persistently scheduled by SL grants in valid activation DCIs according to clause 10.2A of [6, TS 38.213].

[0611] 8.1.2.1 Resource allocation in the time domain

[0612] The UE shall transmit the PSSCH in the same time slot as the associated PSCCH.

[0613] The smallest resource allocation unit in the time domain is a time slot.

[0614] The UE shall transmit PSSCH in consecutive symbols within a slot, subject to the following constraints:

[0615] - The UE shall not transmit PSSCH in symbols not configured for the sidelink. The symbols used for the sidelink are configured according to the higher layer parameters sl-StartSymbol and sl-LengthSymbols, where sl-StartSymbol is the symbol index of the first symbol in sl-LengthSymbols consecutive symbols configured for the sidelink.

[0616] - Within a slot, PSSCH resource allocation starts at symbol sl-StartSymbol+1, except when startingSymbolFirst and startingSymbolSecond are provided for SL-BWP. If startingSymbolFirst and startingSymbolSecond are provided for SL-BWP, there are 2 candidate starting symbols for PSSCH transmission for slots without PSFCH symbols. PSSCH resource allocation starts at the next symbol after each candidate starting symbol. In a slot, the UE may use the second candidate starting symbol provided by startingSymbolSecond only if it fails to access the channel before the first starting symbol provided by startingSymbolFirst. The UE shall not use the second starting symbol in a slot with PSFCH symbols.

[0617] - If PSFCH is configured in this slot, the UE shall not transmit PSSCH in symbols configured for use by PSFCH.

[0618] - The UE shall not transmit PSSCH in the last symbol configured for sidelink.

[0619] - If PSFCH is configured in this slot, the UE shall not transmit PSSCH in the symbol immediately preceding the symbol configured for use by PSFCH.

[0620] …

[0621] In sidelink resource allocation mode 1:

[0622] -For sidelink dynamic grant, PSSCH transmission is scheduled by DCI format 3_0.

[0623] - For sidelink configured grant type 2, the configured grant is activated through DCI format 3_0.

[0624] - For Sidelink Dynamic Grant and Sidelink Configured Grant Type 2:

[0625] - The "Time Slot" field value m of DCI format 3_0 provides index m+1 into the slot offset table. The table is given by the higher layer parameter sl-DCI-ToSL-Trans, and the table value at index m+1 will be referred to as the slot offset K SL .

[0626] - The time slot of the first sidelink transmission scheduled by DCI is no earlier than The first SL time slot of the corresponding resource pool, where T DLis the start time of the downlink time slot carrying the corresponding DCI, T TA is the timing advance value corresponding to the TAG of the serving cell on which the DCI is received, and K SL is the time slot offset between the time slot of the DCI and the first sidelink transmission scheduled by the DCI, and T slot is the SL slot duration.

[0627] - The "Configuration Index" field of DCI format 3_0 (if provided and not reserved) indicates the index of the sidelink configured type 2.

[0628] - For sidelink configured grant type 1:

[0629] - The time slots of the first sidelink transmission follow the higher layer configuration according to [10, TS 38.321].

[0630] <text omitted>

[0631] 8.1.2.2 Resource allocation in the frequency domain

[0632] The resource allocation unit in the frequency domain is a subchannel.

[0633] The sub-channel assignment for sidelink transmissions is determined using the "Frequency Resource Assignment" field in the associated SCI.

[0634] The lowest subchannel used for sidelink transmissions is the subchannel of the lowest PRB on which the associated PSCCH is transmitted.

[0635] If a PSSCH scheduled by a PSCCH would overlap with resources containing the PSCCH, then resources corresponding to the union of the PSCCH and the associated PSCCH DM-RS that have scheduled the PSSCH are not available for the PSSCH.

[0636] When the PSSCH is transmitted on multiple RB sets, the corresponding PSCCH is located in the subchannel with the smallest index of the lowest RB set.

[0637] <text omitted>

[0638] …

[0639] 8.1.4 UE procedure for determining the resource subset to be reported to higher layers in PSSCH resource selection in sidelink resource allocation mode 2

[0640] In resource allocation mode 2, higher layers may request the UE to determine the resource subset from which the higher layers will select resources for PSSCH / PSCCH transmission. To trigger this procedure, in time slot n, higher layers provide the following parameters for this PSSCH / PSCCH transmission:

[0641] - the resource pool from which the resource will be reported;

[0642] -L1 priority prio TX ;

[0643] - Remaining packet delay budget;

[0644] If the higher layer parameter transmissionStructureForPSCCHandPSSCH is not provided, then the number of subchannels to be used for PSSCH / PSCCH transmission in a slot is L subCH If the higher layer parameter transmissionStructureForPSCCHandPSSCH is set to 'contiguousRB', then L subCH Corresponds to the number of subchannels within all used RB sets to be used for PSCCH / PSSCH transmissions in a slot. If the higher layer parameter transmissionStructureForPSCCHandPSSCH is set to 'interlaceRB', then L subCH corresponds to the number of subchannels to be used for PSSCH / PSCCH transmission in a slot in each RB set,

[0645] - If the higher layer parameter transmissionStructureForPSCCHandPSSCH is set to 'interlaceRB', then the number of used RB sets L for one PSCCH / PSSCH transmission RBset .

[0646] - Optionally, the number N of consecutive time slots for multi-consecutive time slot transmission slot,MCSt .

[0647] - Optionally, the resource reservation interval P in milliseconds rsvp_TX .

[0648] …

[0649] - Optionally, instructions from a resource selection authority.

[0650] - Optionally, rbSetsWithConsecutiveLBTFailure indicating the RB sets in which consistent LBT failures have been indicated.

[0651] -N slot,MCSt , which indicates the number of consecutive time slots used for MCSt.

[0652] The following higher-level parameters affect this procedure:

[0653] -sl-SelectionWindowList: internal parameter T 2min Set to target prio TX The given value of comes from the corresponding value of the higher-level parameter sl-SelectionWindowList.

[0654] -sl-Thres-RSRP-List: This higher layer parameter provides each combination (p i ,p j ) RSRP threshold, where p i is the value of the priority field in the received SCI format 1-A, and p j is the priority with which the UE selects resources for transmission; for a given invocation of this procedure, p j =prio TX .

[0655] -sl-RS-ForSensing selects whether the UE uses PSSCH-RSRP or PSCCH-RSRP measurement as defined in clause 8.4.2.1.

[0656] -sl-ResourceReservePeriodList

[0657] -sl-SensingWindow: The internal parameter T0 is defined as the number of time slots corresponding to sl-SensingWindow milliseconds

[0658] -sl-TxPercentageList: for a given prio TX The internal parameter X is defined as sl-TxPercentageList(prio) which converts from percentage to ratio. TX )

[0659] …

[0660] Resource reservation interval P rsvp_TX (if provided) Convert from milliseconds to logical time slots, thus generating P′ according to clause 8.1.7 rsvp_TX .

[0661] When the resource pool is (pre-)configured with sl-AllowedResourceSelectionConfig containing full sensing and full sensing is configured in the UE by higher layers, the UE performs full sensing.

[0662] When periodic reservation for another TB (sl-MultiReserveResource) is enabled for a resource pool, the resource pool is (pre)configured with sl-AllowedResourceSelectionConfig including partial sensing, and partial sensing is configured by higher layers, the UE performs periodic based partial sensing unless other conditions are stated otherwise in the specification.

[0663] When the UE is triggered by higher layers to report resources for resource (re)selection in a Mode 2 Tx pool, the resource pool is (pre)configured with an sl-AllowedResourceSelectionConfig that includes partial sensing, and partial sensing is configured by higher layers, the UE performs contiguous partial sensing unless otherwise specified in the specification.

[0664] Note:

[0665] Identifies the set of time slots that belong to the sidelink resource pool and is defined in clause 8.

[0666] For dynamic co-channel coexistence of LTE sidelink and NR sidelink, Identifies the set of subframes that may belong to the LTE sidelink resource pool as defined in clause 14.1.5 of [19, TS36.213].

[0667] Use the following steps:

[0668] 1) If a number of consecutive time slots N slot,MCSt If set to a value greater than 1, then the candidate multi-slot resource definition is applied. Otherwise, the candidate single-slot resource definition is applied.

[0669] If the higher layer parameter transmissionStructureForPSCCHandPSSCH is set to 'contiguousRB', then the candidate multi-slot resource R x,y Defined as the time slot from Initial N slot,MCSt L starting from subchannel x in consecutive time slots subCH A set of connected subchannels.

[0670] If the higher layer parameter transmissionStructureForPSCCHandPSSCH is set to 'interlaceRB', then the candidate multi-slot resource R x,y,z Defined as L starting from RB set z RBset The connected RBs are concentrated in the slave time slot Initial N slot,MCSt L starting from subchannel x in consecutive time slots subCHA set of connected subchannels.

[0671] If the higher layer parameter transmissionStructureForPSCCHandPSSCH is not provided, then the candidate single slot resources R for transmission x,y Defined as having time slots L of subchannel x+j in subCH The set of connected subchannels, where j = 0, ..., L subCH -1.

[0672] The UE shall assume that any L subCH The connected subchannel set or L in the corresponding resource pool contained in the time interval [n+T1, n+T2] RBset L in the connected RB set subCH The contiguous subchannel corresponds to a candidate single-slot resource or a candidate multi-slot resource for the UE to perform full sensing, and corresponds to a resource (re)selection (P) for the UE to perform periodic partial sensing and periodic transmission triggering together with contiguous partial sensing in the Y candidate slot set within the time interval [n+T1, n+T2]. rsvp_TX ≠0), or in the Y′ candidate time slot set within the time interval [n+T1, n+T2], corresponding to the resource (re)selection (P) for the UE to perform at least contiguous partial sensing and aperiodic transmission triggering. rsvp_TX =0), where

[0673] -T1 selection depends on The following UE implementation, where the time slots in Table 8.1.4-2 are defined where μ SL SCS configuration for SL BWP;

[0674] -If T 2min is shorter than the remaining packet delay budget (in time slots), then T2 depends on the time it takes to experience T 2min ≤ T2 ≤ Remaining Packet Delay Budget (in time slots) for UE implementation; otherwise, T2 is set to the Remaining Packet Delay Budget (in time slots).

[0675] -UE selects Y, where Y ≥ Y min .

[0676] -UE selects Y′, where Y′≥Y′ min When the UE performs at least connected partial sensing and if P rsvp_TX = 0, then the UE selects a set of Y′ candidate time slots with corresponding PBPS and / or CPS results (if available). If the number of candidate time slots Y′ is less than Y′ min, then it depends on the UE implementation to include other candidate time slots.

[0677] If the higher layer parameter transmissionStructureForPSCCHandPSSCH is set to 'contiguousRB', the UE shall exclude candidate single-slot or candidate multi-slot resources with resource blocks having the lowest subchannel containing intra-cell guard bands PRBs configured by the higher layer parameter intraCellGuardBandsSL-List.

[0678] The total number of remaining candidate single-slot resources or candidate multi-slot resources is denoted by M total Mark.

[0679] 2) When the UE performs full sensing, the sensing window is composed of the time slot range Definition, where T0 is defined above and defined in Table 8.1.4-1 where μ SL is the SCS configuration of the SL BWP. The UE shall monitor the slots belonging to the sidelink resource pool within the sensing window, except for the slots in which its own transmission occurs. The UE shall perform the actions in the subsequent steps based on the decoded PSCCH and the measured RSRP in these slots.

[0680] When the UE performs periodic partial sensing, the UE shall monitor The time slots at is a time slot among the selected candidate time slots and P′ reserve It is converted into P in logical time slots according to clause 8.1.7. reserve The UE shall perform the actions in the following steps based on the decoded PSCCH and measured RSRP in these slots.

[0681] P reserve The value of corresponds to sl-PBPS-OccasionReservePeriodList if (pre-)configured, otherwise it corresponds to all periodicities from sl-ResourceReservePeriodList.

[0682] The UE monitors the sensing occasions determined by sl-Additional-PBPS-Occasion, as described previously, and no earlier than n-T0. reserve , the value of k corresponds to earlier than The most recent sensing occasion of the periodic sensing occasion, and additionally includes the value of k corresponding to the last periodic sensing occasion before the most recent periodic sensing occasion if sl-Additional-PBPS-Occasion is (pre-)configured. It is the first time slot among the selected Y candidate time slots of PBPS.

[0683] …

[0684] …

[0685] 3) Internal parameter Th(p i ,p j ) is set to the corresponding value of the RSRP threshold indicated by the i-th field in sl-Thres-RSRP-List, where i=p i +(p j -1)*8.

[0686] -……

[0687] 4) Set S A is initialized to the set of all candidate single-slot resources or candidate multi-slot resources.

[0688] 5) The UE shall select A Exclude any candidate single-slot resource R x,y or R x,y,z or candidate multi-slot resource R x,y or R x,y,z , provided that all of the following conditions are met:

[0689] - The UE does not monitor the time slot in step 2

[0690] - Any periodicity value allowed for the higher layer parameter sl-ResourceReservePeriodList and in the time slot The hypothetical SCI format 1-A received in , in which the 'resource reservation period' field is set to the periodicity value and indicates all sub-channels of the resource pool in this time slot, will satisfy condition c in step 6.

[0691] …

[0692] 5a) If the set S A The remaining candidate single-slot resources R x,y or R x,y,z The number of candidate multi-slot resources R x,y or R x,y,z The number is less than X·M total , then set S A is initialized to the set of all candidate single-slot resources, as in step 4.

[0693] 6) The UE shall select A Exclude any candidate single-slot resource R x,y or R x,y,z or candidate multi-slot resource R x,y or R x,y,z , provided that all of the following conditions are met:

[0694] a)UE in time slot The SCI format 1-A is received in the TS 38.213, and the 'resource reservation period' field (if present) and the 'priority' field in the received SCI format 1-A indicate the value P according to clause 16.4 of [6, TS 38.213] respectively. rsvp_RX and prio RX ;

[0695] b) RSRP measurements performed according to clause 8.4.2.1 for received SCI format 1-A are higher than Th(prio RX ,prio TX );

[0696] c) In time slot or if and only if the 'Resource Reservation Period' field is present in the received SCI format 1-A, it is assumed that the resource reservation period is in the time slot The same SCI format received in the resel -1, with A set of overlapping resource blocks and time slots. Here, P′ rsvp_RX It is converted into P in logical time slots according to clause 8.1.7. rsvp_RX ,if And n′-m≤P′ rsvp_RX ,So If the UE has full sensing configured by its higher layers, then in time slot n, it belongs to the set In the case of Otherwise the time slot is in the set The first time slot after time slot n; if the UE is configured with partial sensing through its higher layer, then in time slot Belong to set In the case of Otherwise the time slot is in the set Time slot Otherwise Q = 1. If the UE is configured with full sensing by its higher layers, then T scal Set to convert to the selection window size T2 in milliseconds. If the UE is configured with partial sensing by its higher layers, then should be converted to milliseconds, where the time slot is the last slot among the Y or Y′ candidate slots. is the first slot in the set of selected / remaining Y or Y′ candidate slots.

[0697] …

[0698] 6a) This step is only performed if the procedure in Section 8.1.4A is triggered.

[0699] 6b) This step is only performed if the procedure in Section 8.1.4C is triggered.

[0700] 7) If set S A The number of candidate single-slot resources or candidate multi-slot resources remaining in total , then Th(p i ,p j )[and ThLTE(p i ,p j )(if set)] for each priority value (p i ,p j ) is increased by 3dB, and the procedure continues with step 4.

[0701] …

[0702] The UE shall report set S to higher layers A .

[0703] …

[0704] Table 8.1.4-1: Dependence on subcarrier spacing

[0705]

[0706] Table 8.1.4-2: Dependence on subcarrier spacing

[0707]

[0708] …

[0709] <text omitted>

[0710] 8.1.5 UE procedure for determining time slots and resource blocks for PSSCH transmissions associated with SCI format 1-A

[0711] The set of time slots and resource blocks used for PSSCH transmission is determined by the resources for PSCCH transmission containing the associated SCI format 1-A and the fields 'Frequency resource allocation', 'Time resource allocation' of the associated SCI format 1-A, as described below.

[0712] 'Time resource assignment' carries a logical slot offset indication of N=1 or 2 actual resources when sl-MaxNumPerReserve is 2, and carries a logical slot offset indication of N=1 or 2 or 3 actual resources when sl-MaxNumPerReserve is 3, in the form of a time RIV (TRIV) field, determined as follows:

[0713]

[0714] Wherein the first resource is in a time slot in which SCI format 1-A is received, and t i Indicates the time offset of the i-th resource relative to the first resource in the logical time slot of the resource pool, where for N=2, 1≤t1≤31; and for N=3, 1≤t1≤30, t1 <t2≤31。

[0715] Determine the starting subchannel of the first resource according to clause 8.1.2.2 The number of contiguously allocated subchannels for each of the N resources and the starting subchannel index of the resource indicated by the received SCI format 1-A (except for the resources in the time slot in which the SCI format 1-A was received) is determined from the "frequency resource allocation" equal to frequency RIV (FRIV), where:

[0716] If sl-MaxNumPerReserve is 2, then

[0717]

[0718] If sl-MaxNumPerReserve is 3, then

[0719]

[0720] in

[0721] - Indicates the starting subchannel index of the second resource

[0722] - Indicates the starting subchannel index of the third resource

[0723] - is the number of subchannels in the resource pool, or if the higher layer parameter transmissionStructureForPSCCHandPSSCH is set to 'interlaceRB', is the number of subchannels per RB set provided by the higher layer parameter sl-NumSubchannel

[0724] If the higher layer parameter transmissionStructureForPSCCHandPSSCH is set to 'interlaceRB', then the same interleaving index is applied in different RB sets.

[0725] If the higher layer parameter transmissionStructureForPSCCHandPSSCH is set to 'interlaceRB', then the starting RB set of the first resource is determined according to clauses [ABCDE] For N resources L RBset The number of RB sets for each contiguous allocation in ≥ 1 and the starting RB set index of the resources indicated by the received SCI format 1-A (except the resources in the time slot in which the SCI format 1-A is received) are determined from the "Frequency Resource Allocation" equal to the frequency RIV (FRIV), where:

[0726] If sl-MaxNumPerReserve is 2, then

[0727] -

[0728] If sl-MaxNumPerReserve is 3, then

[0729] -

[0730] in

[0731] - Indicates the starting RB set index of the second resource

[0732] - Indicates the starting RB set index of the third resource

[0733] -N RBset is the number of RB sets in the resource pool

[0734] -L RBset is the number of RB sets for each of the indicated resources

[0735] If the higher layer parameter transmissionStructureForPSCCHandPSSCH is set to 'interlaceRB', then the resources are determined by the union of the interleaved intersection points corresponding to the indicated subchannels and the in-cell guard bands (if any) between the indicated set of RBs and the indicated RB set.

[0736] If TRIV indicates N < sl-MaxNumPerReserve, then the starting subchannel index corresponding to the sl-MaxNumPerReserve minus N last resources is not used.

[0737] The number of time slots in a time and frequency resource set for a transmission opportunity for PSSCH is given by C resel where, if configurable, C resel = 10 * SL_RESOURCE_RESELECTION_COUNTER[10, TS 38.321], otherwise C resel is set to 1.

[0738] If the subchannel set in a time slot is determined as the time and frequency resources for a PSSCH transmission corresponding to a selected sidelink grant (described in [10, TS 38.321]), then the same subchannel set in the time slot is also determined for the PSSCH transmission corresponding to the same sidelink grant, where j = 1, 2,..., C resel -1, P rsvp_TX (if provided) is converted from milliseconds to logical time slots, and P' is obtained according to Article 8.1.7 rsvp_TX and is determined by Article 8 Here, P rsvp_TX is the resource reservation interval indicated by the higher layer.

[0739] <Omitted text>

[0740] When running CR of TS 38.212 ([4]R1-2308714, Introduction to Rel-18 NR Sidelink Evolution), the following is provided.

[0741] 8.3.1.1 SCI Format 1-A

[0742] SCI Format 1-A is used to schedule PSSCH and the Level 2 SCI on PSSCH

[0743] The following information is transmitted by means of SCI Format 1-A:

[0744] - Priority - 3 bits, as specified in clause 5.4.3.3 of [12, TS 23.287] and clause 5.22.1.3.1 of [8, TS 38.321]. A value of '000' in the priority field corresponds to a priority value of '1', a value of '001' in the priority field corresponds to a priority value of '2', and so on.

[0745] - Frequency resource assignment - the number of bits determined as follows:

[0746] - If the higher layer parameter transmissionStructureForPSCCHandPSSCH in SL-BWP-Config is not configured or is configured to 'contigousRB',

[0747] ●- bit, then the value of the higher layer parameter sl-MaxNumPerReserve is configured to 2; otherwise bit, in which case the value of the higher layer parameter sl-MaxNumPerReserve is configured to 3, as defined in clause 8.1.5 of [6, TS 38.214].

[0748] - If the higher layer parameter transmissionStructureForPSCCHandPSSCH in SL-BWP-Config is configured to 'interlaceRB',

[0749] - X+Y bits provide frequency domain resource allocation according to clause xx of [6, TS 38.214], where X MSBs provide RB set allocation and Y LSBs provide subchannel allocation,

[0750] The value of -X is determined by the value of 2 when the higher layer parameter sl-MaxNumPerReserve is configured. Determined by, or by, when the higher layer parameter sl-MaxNumPerReserve is configured with a value of 3 Determine, where N RBset is the number of RB sets in the resource pool

[0751] The value of -Y is determined by the value of 2 when the higher layer parameter sl-MaxNumPerReserve is configured. Determined by, or by, when the higher layer parameter sl-MaxNumPerReserve is configured with a value of 3 Determine, among which is the number of subchannels per RB set.

[0752] - Time Resource Assignment - 5 bits, when the value of the higher layer parameter sl-MaxNumPerReserve is configured to 2; otherwise 9 bits, when the value of the higher layer parameter sl-MaxNumPerReserve is configured to 3, as defined in clause 8.1.5 of [6, TS 38.214].

[0753] -Resource reservation period bits, as defined in clause 16.4 of [5, TS 38.213], where N rsv_period Is the number of entries in the higher layer parameter sl-ResourceReservePeriodList if the higher layer parameter sl-MultiReserveResource is configured; otherwise it is 0 bits.

[0754] -DMRS mode bits, as defined in clause 8.4.1.1.2 of [4, TS 38.211], where N pattern It is the number of DMRS patterns configured by the higher layer parameter sl-PSSCH-DMRS-TimePatternList.

[0755] - Level 2 SCI format - 2 bits, as defined in Table 8.3.1.1-1.

[0756] - Beta_offset indicator - 2 bits, as provided by higher layer parameter sl-BetaOffsets2ndSCI and Table 8.3.1.1-2.

[0757] - Number of DMRS ports - 1 bit, as defined in Table 8.3.1.1-3.

[0758] - Modulation and coding scheme - 5 bits, as defined in clause 8.1.3 of [6, TS 38.214].

[0759] - Additional MCS table indicator - as defined in clause 8.1.3.1 of [6, TS 38.214]: 1 bit if one MCS table is configured by the higher layer parameter sl-Additional-MCS-Table; 2 bits if two MCS tables are configured by the higher layer parameter sl-Additional-MCS-Table; otherwise 0 bit.

[0760] -PSFCH Overhead Indication - 1 bit, as defined in clause 8.1.3.2 of [6, TS 38.214], provided that the higher layer parameter sl-PSFCH-Period = 2 or 4; otherwise 0 bit.

[0761] - Reserved - The number of bits determined by:

[0762] -N reserved bits, as configured by the higher layer parameter sl-NumReservedBits, where the value is set to zero, provided that the higher layer parameter sl-IndicationUE-B is not configured, or the higher layer parameter sl-IndicationUE-B is configured to 'disabled';

[0763] -Otherwise (N reserved -1) bits, where the value is set to zero.

[0764] - Conflict Information Receiver Flag - 0 or 1 bit

[0765] -1 bit, provided that the higher layer parameter sl-IndicationUE-B is configured to 'enabled', where a bit value of 0 indicates that the UE cannot be a UE that receives conflicting information, and a bit value of 1 indicates that the UE can be a UE that receives conflicting information, as defined in clause 16.3.0 of [5, TS 38.213];

[0766] -Otherwise 0 bit.

[0767] Table 8.3.1.1-1: Level 2 SCI format

[0768] Value of the Level 2 SCI format field Level 2 SCI format 00 SCI Format 2-A 01 SCI Format 2-B 10 SCI Format 2-C 11 Reserve

[0769] Table 8.3.1.1-2: Mapping of Beta_offset indicator values ​​to indices in Table 9.3-2 of [5, TS38.213]

[0770]

[0771] Table 8.3.1.1-3: Number of DMRS ports

[0772] The value of the DMRS Port Number field Antenna Port 0 1000 1 1000 and 1001

[0773] <Unchanged parts omitted>

[0774] 8.4.1.1 SCI Format 2-A

[0775] SCI format 2-A is used to decode the PSSCH through the HARQ operation when the HARQ-ACK information includes ACK or NACK, when the HARQ-ACK information includes only NACK, or when there is no feedback of the HARQ-ACK information.

[0776] The following information is transmitted with the help of SCI Format 2-A:

[0777] -HARQ process number - 4 bits.

[0778] - New data indicator - 1 bit.

[0779] - Redundancy version - 2 bits, as defined in Table 7.3.1.1.1-2.

[0780] - Source ID - 8 bits, as defined in clause 8.1 of [6, TS 38.214].

[0781] - Destination ID - 16 bits, as defined in clause 8.1 of [6, TS 38.214].

[0782] - HARQ feedback enable / disable indicator - 1 bit, as defined in clause 16.3 of [5, TS 38.213].

[0783] - Broadcast type indicator - 2 bits, as defined in Table 8.4.1.1-1 and in clause 8.1 of [6, TS 38.214].

[0784] - CSI Request - 1 bit, as defined in clause 8.2.1 of [6, TS 38.214] and clause 8.1 of [6, TS 38.214].

[0785] If the higher layer parameter transmissionStructureForPSCCHandPSSCH in SL-BWP-Config is configured, then all remaining fields are set as follows:

[0786] -CAPC-2 bit. A value of '00' in the CAPC field corresponds to a CAPC value of '1', a value of '01' in the CAPC field corresponds to a priority value of '2', and so on.

[0787] - COT Shared Broadcast Type - 2 bits, as defined in Table 8.4.1.1-1.

[0788] - COT Shared Extra ID - 24 bits. The 16 LSBs provide the Layer 1 Destination ID and the 8 MSBs provide the Layer 1 Source ID as defined in [6, TS38.214]. When the value of the COT Shared Broadcast Type field is set to '00' or '01', the 8 MSBs are reserved.

[0789] - Remaining COT duration bits, where μ is defined in Table 4.2-1 of clause 4.2 of [4, TS 38.211].

[0790] Table 8.4.1.1-1: Broadcast type indicator or COT shared broadcast type

[0791]

[0792] In [5] 3GPP TS 38.331 V17.0.0 (2022-03) 3rd Generation Partnership Project; Technical Specification Group Radio Access Network; NR; Radio Resource Control (RRC) Protocol Specification (Release 17), some IEs are referenced below.

[0793] –SL-BWP-PoolConfig

[0794] IE SL-BWP-Config is used to configure UE-specific NR sidelink communication on a specific sidelink bandwidth portion.

[0795] SL-BWP-Config Information Elements

[0796]

[0797]

[0798] -SL-BWP-PoolConfig

[0799] IE SL-BWP-PoolConfig is used to configure the NR side link communication resource pool.

[0800] SL-BWP-PoolConfig Information Element

[0801]

[0802] -SL-BWP-PoolConfig

[0803] IE SL-FreqConfig specifies dedicated configuration information about one specific carrier frequency used for NR sidelink communication.

[0804] SL-FreqConfig Information Element

[0805]

[0806]

[0807] -SL-ResourcePool

[0808] IE SL-ResourcePool specifies the configuration information for the NR side link communication resource pool.

[0809] SL-ResourcePool Information Element

[0810]

[0811]

[0812]

[0813]

[0814]

[0815]

[0816] In [6] RP-222806, the adjustments and objectives are referenced below.

[0817] Adjustment

[0818] In Rel-16, sidelink communications are developed primarily in RAN to support advanced V2X applications. In Rel-17, SA2 studies and standardizes proximity-based services, including public safety and business-related services. As part of Rel-17, power saving solutions (e.g., partial sensing, DRX) and inter-UE coordination have been developed in RAN1 and RAN2 to improve power consumption of battery-constrained terminals and reliability of sidelink transmissions.

[0819] While NR sidelink was initially developed for V2X applications, there is growing interest in the industry to extend the applicability of NR sidelink to commercial use cases. For commercial sidelink applications, two key requirements have been identified:

[0820] - Increased sidelink data rate

[0821] - Support for new carrier frequencies for sidelink

[0822] The increased sidelink data rate is driven by applications such as sensor information (video) sharing between vehicles with a high degree of driving automation. Commercial use cases may require data rates that exceed those possible in Rel-17. The increased data rate can be achieved through support for sidelink carrier aggregation and sidelinks on unlicensed spectrum. In addition, by enhancing FR2 sidelink operation, the increased data rate can be supported more efficiently on FR2. Although support for new carrier frequencies and larger bandwidths will also allow improvements to its data rate, the main benefit will come from making the sidelink more suitable for a wider range of applications. More specifically, through support for unlicensed spectrum and enhancements in FR2, the sidelink will be in a better position to be implemented in commercial devices because the utilization of the ITS band is limited by ITS safety-related applications.

[0823] Another aspect to consider is the V2X deployment scenario where LTE V2X and NR V2X devices coexist on the same frequency channel. In order for the two different types of devices to coexist while using a common carrier frequency, it is important that there is a mechanism for the two technologies to efficiently utilize resource allocation without adversely affecting the operation of each technology. This requirement is also mentioned as part of the input from the 5G Automotive Association to the Rel-18 RAN workshop.

[0824] 4 Objectives

[0825] 4.1 Objectives of SI or core WI or test WI

[0826] To examine Goals 1 and 3 in RAN#97, the aim is to develop specifications for Goals 1 and 3, taking into account the progress made on Goals 2 and 4.

[0827] ○……

[0828] 1. Study and specify support for sidelink on unlicensed spectrum for Mode 1 and Mode 2, where Uu operation for Mode 1 is limited to licensed spectrum [RAN1, RAN2, RAN4]

[0829] - Channel access mechanisms from NR-U should be reused for sidelink unlicensed operation

[0830] ○ Evaluate the applicability of sidelink resource reservation from Rel-16 / Rel-17 to sidelink unlicensed operation within the boundaries of unlicensed channel access mechanisms and operations

[0831] ■No specific enhancements to Rel-17 resource allocation mechanism

[0832] ■If the existing NR-U channel access framework does not support the required SL-U functionality, the WG will make appropriate recommendations for RAN approval.

[0833] - Physical channel design framework: Makes necessary changes to the NR sidelink physical channel structure and procedures to operate on unlicensed spectrum

[0834] ○ The existing NR sidelink and NR-U channel structure will be reused as a reference.

[0835] - No specific enhancements to existing NR SL features

[0836] - The study should focus on the FR1 unlicensed bands (n46 and n96 / n102) and will be completed by RAN#98.

[0837] In New Radio (NR) Rel-16, it is the first version of NR sidelink vehicle-to-everything (V2X), and the current standard already meets the requirements as defined in SA1. Considering that in the near future, as more and more devices require higher processing and higher data rates, sidelink transmission on wider frequency resources may be required. However, the current frequency bands supporting PC5 interface or sidelink transmission may be insufficient. Therefore, introducing sidelink transmission on unlicensed / shared spectrum under large spectrum availability may be a targeted solution. In order to coexist fairly with other devices in the same or different radio access technologies (Radio Access Technology, RAT) or different technologies (e.g., WiFi) in unlicensed spectrum, Listen-Before-Talk (LBT) may be required. LBT is an energy detection or sensing technology based on the LBT result (idle or busy) before transmission, and the device can determine whether to allow transmission. There is a brief introduction to new radio unlicensed for Uu interface in [2] R1-2308756 and [3] R1-2308720. LBT can be simply divided into short LBT (e.g., CAT1-LBT and CAT2-LBT) and long LBT (e.g., CAT4-LBT). For short LBT, the device may be allowed to perform transmission without LBT or perform relatively short LBT; while for long LBT, the device may need to take a relatively long time (e.g., with more sensing slots idle and preferably with backoff) to perform transmission with LBT. Long LBT corresponds to the Type 1 channel access procedure in TS 37.213, and short LBT corresponds to the Type 2 / 2A / 2B / 2C channel access procedure in TS 37.213. However, for sidelink reception, continuously listening to or receiving or detecting sidelink resources may be an assumption in the sidelink device.

[0838] In NR Rel-16, for resource allocation mode 1 (e.g., network scheduling mode) in NR sidelink V2X, a transmitting (TX) user equipment (UE) may receive one sidelink grant from a network node, and the sidelink grant may schedule one, two, or three sidelink resources in a sidelink resource pool. The sidelink grant may indicate one physical uplink control channel (PUCCH) resource (responsive to whether the TX UE requires another sidelink resource). The sidelink grant indicates one PUCCH resource by at least indicating a slot offset of the slot relative to a physical sidelink feedback channel (PSFCH) time position (e.g., indicating which slot the PUCCH is in). The sidelink grant indicates one PUCCH resource by at least a PUCCH resource indicator (e.g., within a slot, indicating which PUCCH resource). The PUCCH resource indicator shall indicate one PUCCH resource in each PUCCH resource set in a slot. The slot of the PUCCH resource is based on the slot offset and the slot of the PSFCH, where the PSFCH is associated with the last scheduled sidelink resource. The size of the Hybrid Automatic Repeat Request (HARQ) information associated with the sidelink may affect the UE's determination of which PUCCH resource set in the time slot is being used. One PUCCH resource is later than the last PSFCH time position associated with the last scheduled resource among one, two, or three scheduled sidelink resources. In addition, the HARQ information associated with the sidelink may be associated with one subcodebook, and the HARQ information associated with the downlink assignment may be associated with another subcodebook. The HARQ information associated with the downlink assignment may be in response to PDSCH (including semi-static scheduling (SPS) PDSCH), SPS release (i.e., Physical Downlink Control Channel (PDCCH), indicating only SPS release), indicating DCI without a downlink assignment beam (i.e., PDCCH indicating only beam indication), and sleep without downlink assignment (i.e., PDCCH indicating only sleep). HARQ information. The PUCCH carrying / delivering one subcodebook and the PUCCH carrying / delivering another subcodebook will be different PUCCH resources. Different PUCCH resources may be in time domain partitions. Different PUCCH resources may be two different PUCCHs in different time slots or different symbols. The UE does not multiplex one subcodebook and another subcodebook into one PUCCH resource. The TX UE performs sidelink transmission to one or more receiver (RX) UEs via scheduled sidelink resources. The TX UE may set sidelink (SL) HARQ to be enabled or not enabled (deactivated) for sidelink transmission.One, two or three scheduled side link resources are associated with the same transport block (TB) / medium access control (MAC) packet data unit (PDU) or different TB / MAC PDUs. One, two or three scheduled side link resources may be in consecutive (physical) time slots or consecutive (side link) time slots in the side link resource pool.

[0839] In NR Rel-16, for resource allocation mode 2 (e.g., autonomous selection mode) in NR sidelink V2X, the TXUE performs full / partial sensing in the sidelink resource pool and determines one or more sidelink resources based on one or more sensing results. The sensing here is different from the channel access procedure defined in the unlicensed spectrum. Sensing means or corresponds to the TX UE determining whether the candidate resource is occupied based on the sidelink control information (SCI) indication and / or the reference signal received power (RSRP) measurement. In one example, Figure 5 In the example, assuming that the higher layer of the TX UE indicates 2 subchannels as a candidate resource, the TX UE determines M total candidate resources in the sidelink resource pool 1, where one candidate resource corresponds to one Transmission Time Interval (TTI) and 2 subchannels. One candidate resource is denoted as Rx,y, where x corresponds to the starting subchannel index and y corresponds to the TTI index.

[0840] For NR rel-18, people try to improve the throughput of the sidelink for supporting higher data rate services. Possible directions are to apply carrier aggregation, apply FR2 carriers with larger bandwidth, and / or apply sidelink communication on unlicensed spectrum. A general assumption for sidelink communication on unlicensed spectrum is that the PC5 interface (i.e., the interface between UE and UE) is on the unlicensed spectrum and the Uu interface (i.e., the interface between UE and network node) is on the licensed spectrum. In terms of the uncertainty of LBT failure for each channel / signal on the unlicensed spectrum, consider increasing the transmission timing / opportunity. For example, increasing the time opportunity of the Physical Sidelink Control Channel (PSCCH) / Physical Sidelink Shared Channel (PSSCH) may be beneficial. In previous versions, the time domain unit for sidelink transmission is one TTI / time slot / subframe, and there is only one start symbol position in each TTI / time slot / subframe (which can be configured in the SL Bandwidth Part (BWP) configuration, for example, via the sl-StartSymbol configuration in SL-BWP-Config). However, in the case of introducing the sidelink using unlicensed spectrum, the contention of the TX UE with only one start symbol may be smaller. Once the TX UE fails to deliver the LBT of the Channel Occupancy Time (COT) used to initiate the traditional start symbol, the TX UE needs to perform LBT for the next time slot, which may cause unnecessary delays (especially when other / another RAT only occupies multiple start symbols in the LBT-invalid time slot / TTI of the TX UE). More than one (candidate) start symbol in the sidelink time slot can make full use of the sidelink transmission on the unlicensed spectrum. When the TX UE fails to deliver the LBT for the first (candidate) start symbol but can deliver the LBT for the next (candidate) start symbol, the TX UE can still perform sidelink transmission in the time slot. One assumption is that the same side link resource pool can be (pre)configured with one or more (candidate) start symbols in the time slot. An alternative assumption is that one or more (candidate) start symbols can be (pre)configured in different side link resource pools, and these two different side link resource pools include at least one same time slot (preferably, in the same or different subchannels and / or carriers / SL BWPs). Regardless of which assumption is used, there are at least two (candidate) start symbol positions labeled #x and #y, where #x is earlier than #y (for example, x is less than y), and #x is #0 to #13, and #y is #0 to #13.In one embodiment / concept, for the side link resource pool, the second (candidate) starting symbol position can be derived / determined based on the first (candidate) starting symbol position and a number of PSCCH symbols configured in the side link resource pool (for example, 2 or 3 symbols based on the configured parameter sl-TimeResourcePSCCH in the side link resource pool configuration). Preferably, in some embodiments, y=X+the number of PSCCH symbols. Alternatively, y=X+1+the number of PSCCH symbols. For example, when the first (candidate) starting symbol position is symbol #x and 2 PSCCH symbols are configured / utilized, the second (candidate) starting symbol position can be derived / determined as symbol #(x+2) or (x+2+1). For example, when the first (candidate) starting symbol position is symbol #x and 3 PSCCH symbols are configured / utilized, the second (candidate) starting symbol position can be derived / determined as symbol #(x+3) or #(x+3+1).

[0841] Preferably, in some embodiments, before transmitting in the unlicensed spectrum, the TX UE performs LBT for energy detection. Preferably, in some embodiments, the LBT corresponds to a channel access procedure defined in the unlicensed spectrum. Preferably, in some embodiments, the frequency granularity of the LBT in FR1 is 20MHz, which can be indicated as an LBT band or an LBT unit or a resource block (RB) set (in the frequency domain). Preferably, in some embodiments, a carrier or an SL BWP or an SL resource pool may include one or more LBT bands. Preferably, in some embodiments, the interlaced structure can be used to meet the occupied channel bandwidth (OCB) and power spectral density (PSD) requirements specified in the unlicensed spectrum. Preferably, in some embodiments, equal space within an interlace or equal number of physical resource blocks (PRBs) between two adjacent PRBs within an interlace is preferred. Preferably, in some embodiments, for two adjacent interlaces, it can be a PRB domain offset between each other. For example, interlace #0 will occupy PRB #0, #10, #20 ... #90 and interlace #1 will occupy PRB #1, #11, #21 ... #91. Preferably, in certain embodiments, such an interlace structure is feasible in meeting the requirements for one LBT band in the unlicensed spectrum.

[0842] When sidelink transmission occurs in an unlicensed spectrum, the concept of COT sharing may be considered, since a responding UE that receives COT sharing information from another UE (e.g., a COT initiating UE) may perform a Type 2A / 2B / 2C channel access instead of a Type 1 channel access. Based on the time gap, if the RX UE can determine, then between the timing associated with receiving the COT sharing information and the timing associated with the sidelink transmission performed by the responding UE, a Type 2A, Type 2B, or Type 2C channel access may be determined. Under the Type 2 series of channel accesses, the sensing duration (performed before the sidelink transmission of the responding UE) is much shorter than a Type 1 channel access. Based on the COT sharing information, at least one of the following information may be determined: a Channel Access Priority Class (CAPC) (for use by the initiating UE of the COT), a remaining COT duration, an RB set (which may be indicated by a frequency field associated with a Frequency Resource Indicator Value (FRIV) of the RB set).

[0843] Due to the different power levels between different nodes, when the COT initiating UE performs a type 1 channel access procedure, the energy detection threshold is determined based on a (pre) configured Energy Detection Threshold (EDT) value (e.g., ue-toUE-COT-SharingED-Threshold). Such (pre) configured values ​​may be (pre) configured in each side link resource pool. Based on the COT initiating UE using the (pre) configured EDT value for performing the type 1 channel access procedure, if the COT initiating UE has performed a successful channel access, the channel is idle at such (pre) configured EDT value. In other words, even when different nodes are associated with different power levels (with different transmit powers), COT sharing is still available and does not bring unfairness issues to other / another RAT (e.g., Wi-Fi). However, there may be a problem when such (pre) configured values ​​are configured in each side link resource pool.

[0844] In one example, the SL BWP in a carrier may be configured with more than one side link resource pool, including at least a first side link resource pool and a second side link resource pool. Each of the more than one side link resource pools includes an integer number of RB sets (contained in the SL BWP). Typically, different side link resource pools may be configured with different characteristics, such as different numbers of time and frequency resources, different sets of reservation periods, and / or different (pre-)configured EDTs. In addition, in order to avoid inter-UE blocking issues from a pool perspective, the entire RB set in one TTI should be associated with only one side link resource pool. In other words, there is no situation where the first side link resource pool includes a subset of one RB set and the second side link resource pool includes another subset of one RB set in one TTI. However, the configuration of the first side link resource pool and the second side link resource pool may cause time division multiplexing (time division multiplexing, TDM) between the first side link resource pool and the second side link resource pool, and there may be a switching boundary between the first side link resource pool and the second side link resource pool. For example, in Figure 6 , the switching boundary is at the end of the 5th time slot. For Multi-Consecutive Slots transmission (MCSt) for use by the COT initiator UE, the COT initiating UE appears to be allowed to continue using the COT until the maximum COT value associated with the channel access priority class (CAPC) occurs. The customer premises equipment (CPE) and the transmit power used for sidelink transmission in pool 2 in the 6th time slot seem to be no problem for the COT initiating UE to execute. On the other hand, there may be problems with COT sharing for CPE and the transmit power used for sidelink transmission in pool 2 in the 6th time slot. Due to the different characteristics of the two side link resource pools, the transmit power used by the responding UE on the 6th time slot may interfere with surrounding nodes or other surrounding RATs. The responding UE may also have problems in whether to determine the CPE before the 6th time slot based on the CPE associated with the outside of the COT or the CPE associated with the inside of the COT. Based on the above, it is necessary to design a method to solve this problem.

[0845] The second issue is related to MCSt. When the higher layers of the UE provide parameters (when triggering the resource identification and / or selection procedure for the sidelink resource pool), the parameters indicate what the candidate (multi-TTI) resources look like. For example, when the parameters indicate 3 consecutive TTIs, the candidate (multi-TTI) resources are defined as a bundle of 3 consecutive TTIs. However, since the resource selection window may include some TTIs that are not included in the sidelink resource pool for resource identification and / or selection or any two consecutive TTIs in the resource selection window may not be physically consecutive in the time domain, it may be necessary to design and update the definition of the candidate (multi-TTI) resources under the logical TTI / time slot. For example, in Figure 7 In the example, the information provided by the higher layer of the UE for resource identification is "1 RB set, 2 subchannels, 3 time slots". Assume that there are X logical TTIs within the resource selection window, for example, logical TTIs with indices 0 to (X-1) (i.e., there are X logical TTIs for resource identification and / or selection in the sidelink resource pool). Based on the above, there are (X-2)(10-1) candidate (multi-TTI) resources within the resource selection window. One candidate (multi-TTI) resource may be denoted as R x,y , where x corresponds to the starting subchannel index and y corresponds to the starting TTI index. However, due to the fact that a practical system may include some (physical) TTIs for resource identification and selection that do not belong to the sidelink resource pool, for R x,3 , R x,4 There may be some problems. Since the indexing / ordering of the logical TTIs for the sidelink resource pool only considers the physical TTIs included / covered in the sidelink resource pool. Figure 7 In the example in , if the logical TTI 4 for the sidelink resource pool corresponds to the physical TTI t, then the logical TTI 5 for the sidelink resource pool corresponds to the physical TTI (t+5). x,3 , R x,4 The motivation for introducing the concept of MCSt or a bundle can be deviated to some extent. x,3 , R x,4 The UE may be caused to perform additional Type 1 channel access procedures, since the COT for the previous TTI cannot extend or cover all TTIs in the candidate (multi-TTI) resources. Therefore, it may be necessary to additionally design how the UE determines the candidate (multi-TTI) resources for the bundle. Some (physical) TTIs may be used for other sidelink resource pools or Sidelink Synchronization Signal Blocks (S-SSB) or reserved TTIs, and / or Uu TTIs (e.g., Downlink (DL) / Uplink (UL) / Flexible TTI).

[0846] One idea is to design whether there is cross-pool COT sharing and / or cross-pool MCSt. Quickly think of excluding S-SSB time slots from the side link resource pool in the time domain, however, S-SSB transmission is eligible to use shared COT. It seems reasonable to have cross-pool COT sharing. Although it is advantageous to support cross-pool COT sharing, the task is arduous, and another direction is to only support cross-pool MCSt (do not support cross-pool COT sharing). In other words, it seems feasible to perform EDT for checking whether the channel is cleared from a single UE perspective, and therefore allow cross-pool MCSt. In general, since the COT initiating UE may not predict the exact time with a successful type 1 channel access procedure, it may be difficult for the COT initiating UE to determine to some extent whether COT covers the cross-pool situation. Finally, the CPE and transmit power in the case of actually supporting cross-pool COT sharing can be further discussed.

[0847] The first concept is that when the first UE initiates a TTICOT including association with more than one side link resource pool and / or association with an S-SSB in a side link BWP in an RB set (here exemplified as an RB set, but not limited to an RB set), the first UE determines the EDT in one of the more than one side link resource pools and / or S-SSBs. More specifically, the EDT is determined based on the lowest or highest value among the (pre)configured EDTs (or EDTs for more than one side link resource pools (preconfigured)) and / or EDTs (or EDTs for S-SSBs (preconfigured)) configured on the configuration of more than one side link resource pools and / or the configuration of the S-SSB. Preferably, in some embodiments, a motivation is to apply a larger value to ensure that the responding UE using a shared COT across side link resource pools (and / or S-SSBs) with different EDTs is still under regulation. Preferably, in some embodiments, the (pre)configured value is or corresponds to ue-toUE-COT-SharingED-Threshold. Preferably, in some embodiments, when the first UE determines a shared COT, the first UE determines an EDT in one of more than one sidelink resource pools and / or S-SSBs. Preferably, in some embodiments, when the first UE determines a shared COT without including TTIs associated with different sidelink resource pools, the first UE determines the EDT based on which sidelink resource pool the sidelink resource is in. Preferably, in some embodiments, once the first UE determines not to share the COT, the first UE does not (need to) use a (pre)configured value to determine the EDT. (When there is no (pre)configured EDT for S-SSB), the second UE eligible to use the shared COT will determine whether its maximum transmit power for S-SSB is under the EDT associated with one sidelink resource pool, wherein the second UE receives an SCI with COT sharing information from the first UE. Alternatively, (when there is no (pre)configured EDT for S-SSB), the second UE eligible to use the shared COT will determine a second maximum transmit power (for the boundary sidelink transmission of the S-SSB, under the EDT used by the first UE to initiate the COT). Alternatively, regardless of whether there is a (pre)configured EDT for S-SSB, the COT sharing of the COT initiating UE may include the TTI for S-SSB transmission by the responding UE. Alternatively, a restriction on the EDT of the S-SSB is that the EDT of the S-SSB is less than the EDT of all sidelink resource pools in the SL BWP. In this way, the responding UE can transmit the S-SSB using the shared COT (without further considering power control constraints). Alternatively, a restriction on the EDT of the S-SSB is that the EDT for the S-SSB is less than the EDT of a subset of the sidelink resource pools in the SLBWP. The subset of the sidelink resource pools includes one or more TTIs that are consecutive and earlier than the TTI of the S-SSB.When the first side link resource pool includes a TTI i+1 earlier than the S-SSB and continuous with TTI i+1, the EDT associated with the S-SSB is (pre)configured to be smaller than the EDT associated with the first side link resource pool. When the second side link resource pool does not include a TTI earlier than the S-SSB and continuous with a TTI earlier than the S-SSB, there is no restriction on the EDT associated with the S-SSB being smaller than the EDT associated with the second side link resource pool. In an alternative, the S-SSB and one or more side link resource pools in the same SL BWP share the same EDT. Preferably, in some embodiments, the EDT configuration may be performed per S-SSB and / or per pool but with restrictions on being associated with the same EDT.

[0848] Preferably, in some embodiments, for a SL BWP or a side link resource pool including a single RB set (or no gaps configured between RB sets),

[0849] - a restriction on the EDT of the S-SSB is that the EDT of the S-SSB is less than the EDT of all sidelink resource pools in the SL BWP, and / or

[0850] - One restriction on the EDT of the S-SSB is that the EDT of the S-SSB is less than the EDT of the subset of the sidelink resource pool in the SL BWP. The subset of the sidelink resource pool includes one or more TTIs that are consecutive and earlier than the TTI of the S-SSB, and / or

[0851] - The S-SSB and one or more sidelink resource pools in the same SL BWP share the same EDT.

[0852] The second concept is that when the first UE initiates a COT including TTIs associated with more than one side link resource pool in one side link BWP in one RB set (here exemplified as one RB set, but not limited to one RB set) and the first UE (has) determined the EDT based on the side link resource pool including the earlier TTI in the COT, whether the first UE shares the COT on the later TTI in the other side link resource pool is based on whether the determined EDT is lower or higher than the (pre) configured value associated with the other side link resource pool. When the EDT used / determined for initiating the COT for channel access is greater than the (pre) configured value associated with the other side link resource pool in the later TTI in the COT, the first UE is allowed to share the COT with other UEs, or the first UE shares the COT with other UEs, wherein the shared COT may include the TTI associated with the other side link resource pool. When the EDT used / determined for initiating COT for channel access is less than the (pre)configured value associated with the other side link resource pool in the later TTI in the COT, the first UE is not allowed to share the COT with other UEs, or the first UE does not share the COT with other UEs. More specifically, the first UE is not allowed to share the later TTI in the other side link resource pool in the COT with other UEs, or the first UE does not share the COT with other UEs. In other words, the first UE may share the earlier TTI in the original side link resource pool in the COT with other UEs. A brief overview of this concept is that the first UE determines whether to share the COT or indicate (a shared COT on another pool in the same RB set) based on whether the EDT used / determined for initiating COT for type 1 channel access procedure is greater than the EDT shared by the (pre)configured COT for the other side link resource pool. Typically, due to the uncertain timing of the cleared type 1 channel access procedure, the first UE has decided to clear the channel based on one EDT while initiating the timing of the COT including the TTI associated with the other side link resource pool in the same RB set.

[0853] Preferably, in some embodiments, for a SL BWP or a side link resource pool including a single RB set (or no gaps configured between RB sets),

[0854] - whether the first UE shares the TTI used to transmit the S-SSB; the COT on the TTI is based on whether the determined EDT is lower or higher than a (pre-)configured value associated with the S-SSB, and / or

[0855] - When the EDT used / determined for initiating COT for channel access is greater than the (pre)configured value associated with the S-SSB in a later TTI in the COT, the first UE is allowed to share the COT with other UEs, or the first UE shares the COT with other UEs, where the shared COT may include the TTI associated with the S-SSB. When the EDT used / determined for initiating COT for channel access is less than the (pre)configured value associated with the S-SSB in a later TTI in the COT, the first UE is not allowed to share the COT with other UEs, or the first UE does not share the COT with other UEs.

[0856] -Preferably, in some embodiments, when the second UE attempts to transmit an S-SSB,

[0857] -If the first UE does not share the COT including the TTI associated with the S-SSB, then the second UE performs a type 1 channel access procedure for acquiring the COT for transmitting the S-SSB, or the second UE performs a type 2A channel access procedure for transmitting the S-SSB (considering / determining that the S-SSB is short control signaling), or directly transmits the S-SSB without performing the channel access procedure (considering / determining that the S-SSB is LBT exempt), and / or

[0858] -If the first UE shares a COT including a TTI associated with an S-SSB, then the second UE performs a type 2A / 2B / 2C channel access procedure to use the shared COT for transmitting the S-SSB and preferably, whether to use type 2A / 2B / 2C is based on the time gap between the (earliest) TTI for transmitting the S-SSB (described in the shared COT) and the TTI including the SCI providing COT sharing information.

[0859] Preferably, in certain embodiments, for a SL BWP or a sidelink resource pool comprising more than a single RB set (or configured with gaps between RB sets), the responding UE may transmit the S-SSB in a shared COT (regardless of / irrespective of the EDT used by the COT initiating UE to initiate the COT).

[0860] Preferably, in some embodiments, when the SL BWP is configured with more than one single RB set (or configured with gaps between RB sets), the EDT of the S-SSB is not (pre-)configured. Preferably, in some embodiments, when the associated sidelink resource pool (to the S-SSB) is configured with more than one single RB set (or configured with gaps between RB sets), the EDT of the S-SSB is not (pre-)configured. In other words, for multiple RB set pools or SL BWPs, the EDT of the S-SSB is not required. Preferably, in some embodiments, the basic theory is that the maximum transmit power of the responsive UE will be divided or split into multiple RB sets so that the regulation requirements can be met.

[0861] The third concept is not to allow the first UE to initiate a COT including TTIs associated with more than one side link resource pool in one side link BWP in one RB set (here exemplified as one RB set, but not limited to one RB set). Preferably, in some embodiments, the side link resource pool boundary is at least determined as the end time of the COT. Preferably, in some embodiments, the boundary between the switching two side link resource pools is at least determined as the end time of the COT. Alternatively, the first UE may initiate a COT including TTIs associated with more than one side link resource pool in one side link BWP in one RB set (here exemplified as one RB set, but not limited to one RB set). The first UE may perform side link transmission in the first / earliest side link resource pool among more than one side link resource pools using COT, and / or the first UE cannot perform side link transmission in other side link resource pools among more than one side link resource pools using COT. This means that the first UE may perform side link transmission in the first / earliest side link resource pool using COT up to the switching boundary (of the first / earliest side link resource pool and the next side link resource pool) in the time domain. Alternatively, when more than one sidelink resource pool is (pre)configured with the same attribute / characteristic or associated with the same attribute / characteristic, the first UE may initiate a COT including TTIs associated with more than one sidelink resource pool in one sidelink BWP in one RB set (here exemplified as one RB set, but not limited to one RB set). The attribute / characteristic corresponds to the same interleaving structure, the number of interleavings corresponding to the subchannel, the EDT, and / or the number of RB sets (with the same starting RB set). When more than one sidelink resource pool is not (pre)configured with the same attribute / characteristic or associated with the same attribute / characteristic, the first UE is allowed to initiate a COT including TTIs associated with more than one sidelink resource pool in one sidelink BWP in one RB set. Preferably, in some embodiments, for an SL BWP or a first sidelink resource pool including a single RB set (or no gaps are configured between RB sets), the first UE and TTIs associated with the S-SSB are allowed to share COTs of TTIs from the first sidelink resource pool.

[0862] The fourth concept is that the first UE initiates a COT including TTIs associated with more than one side link resource pool in one side link BWP in one RB set (here exemplified as one RB set, but not limited to one RB set). The first UE is not allowed to share a COT on a TTI in different side link resource pools. Preferably, in some embodiments, the first UE may perform side link transmission on a TTI in the COT for its side link transmission. Preferably, in some embodiments, the first UE should indicate the remaining COT duration until the switching boundary (of the two side link resource pools) in the time domain. Preferably and / or in addition, when the switching boundary (is from the TTI associated with the side link resource pool to the TTI associated with the S-SSB), the first UE may indicate that the remaining COT duration covers the TTI associated with the S-SSB. Preferably, in some embodiments, the first UE is not allowed or does not indicate that the remaining COT duration includes TTIs associated with more than one side link resource pool. Alternatively, when more than one side link resource pool is (pre) configured with or associated with the same attribute / characteristic, the first UE may share COTs on TTIs in different side link resource pools. The attribute / characteristic corresponds to the same interleaving structure, the number of interleavings corresponding to subchannels, EDT, and / or the number of RB sets (with the same starting RB set). When more than one side link resource pool is not (pre) configured with or associated with the same attribute / characteristic, the first UE is not allowed to share COTs on TTIs in different side link resource pools.

[0863] The fifth concept is that the EDT for COT sharing is (pre) configured as the same value in the side link resource pool set. Preferably, in some embodiments, the side link resource pool set is (pre) configured in the same SL BWP. Preferably, in some embodiments, the side link resource pool set is a time domain partition in at least one RB set. Preferably, in some embodiments, the SL BWP may include one or more RB sets. The side link resource pool set includes a first side link resource pool and a second side link resource pool. When the first side link resource pool and the second side link resource pool both include different TTIs but are in at least one RB set, the (pre) configured EDT value should be the same for these two side link resource pools. Alternatively, EDT (for COT sharing) can be (pre) configured per RB set rather than per side link resource pool. Alternatively, when a side link resource pool includes multiple RB sets, EDT (for COT sharing) can be (pre) configured per RB set in the side link resource pool (e.g., multiple EDTs for COT sharing will be (pre) configured for the side link resource pool). Preferably, in some embodiments, based on which RB set is used to initiate COT, the COT initiating UE will determine which EDT to use. Preferably, in some embodiments, when the COT initiating UE determines candidate resources that occupy more than one RB set, one example is that the COT initiating UE uses / determines the EDT based on the maximum value among the EDTs associated with more than one RB set. Preferably, in some embodiments, another example is that when the COT initiating UE determines candidate resources that occupy more than one RB set, the COT initiating UE is not allowed to share the COT with other UEs. Preferably, in some embodiments, another different example is that when the COT initiating UE determines candidate resources that occupy more than one RB set, the COT initiating UE shares only the COT with other UEs, where the COT occupies a subset of more than one RB set. Preferably, in some embodiments, the subset of more than one RB set corresponds to an RB set where the EDT is less than the EDT used / determined by the COT initiating UE to initiate COT. Alternatively, when a sidelink resource pool includes multiple RB sets, one EDT (for COT sharing) may be (pre)configured in the sidelink resource pool. Preferably, in some embodiments, when initiating COT (and also when the COT initiating UE determines to share COT), the COT initiating UE will use (the same) one EDT. Preferably, in some embodiments, no matter how many RB sets in the sidelink resource pool are occupied by the COT initiated by the COT initiating UE, (the same) one EDT can be used when the COT initiating UE initiates COT. Alternatively, the EDT (for COT sharing) can be (pre-)configured per SL BWP or carrier rather than per sidelink resource pool.

[0864] The sixth concept is that from a (pre)configuration perspective, for a sidelink carrier / cell / SL BWP in an unlicensed spectrum, when one sidelink resource pool is configured with one RB set in the sidelink carrier / cell / SL BWP, the UE does not expect to provide a configuration where another sidelink resource pool is configured with one RB set. Preferably, in some embodiments, one RB set is configured with only one sidelink resource pool. Preferably, in some embodiments, different sidelink resource pools are not configured as TDMed in one RB set even for different TTIs in one RB set. Preferably, in some embodiments, the number of sidelink resource pools is at most the number of RB sets in the sidelink carrier / cell / SL BWP. For example, when the sidelink carrier / cell / SL BWP includes X RB sets, the number of sidelink resource pools in the sidelink carrier / cell / SL BWP is at most X RB sets. Preferably, in some embodiments, when the sidelink resource pool can be configured with Y RB sets, the UE does not expect to provide a configuration where the number of sidelink resource pools is greater than 1+(XY) (e.g., 1 corresponds to a sidelink resource pool with Y RB sets).

[0865] Alternatively, from a (pre-)configuration perspective, for a sidelink carrier / cell / SL BWP in unlicensed spectrum, one SL BWP comprises only one sidelink resource pool. Preferably, in some embodiments, the UE does not expect to provide a configuration of more than one RB set in a SL BWP. Preferably, in some embodiments, one sidelink resource pool comprises the same number of RB sets (or all RB sets associated with one SL BWP) as one SL BWP.

[0866] Preferably, in certain embodiments, the UE is (pre-)configured with a maximum number of (pre-)configured TDM sidelink resource pools in one RB set in the SL BWP.

[0867] Preferably, in certain embodiments, there is a (pre-)configured maximum number of TDM side link resource pools in one RB set in the SL BWP.

[0868] Preferably, in some embodiments, when the network node provides such (pre) configuration for the UE, the network node shall maintain or ensure that the number of (pre) configured TDM side link resource pools in one RB set is less than or equal to the maximum number of (pre) configured TDM side link resource pools in one RB set. Preferably, in some embodiments, the UE does not expect to receive a configuration or is (pre) configured such that the number of (pre) configured TDM side link resource pools in one RB set is greater than the maximum number of (pre) configured TDM side link resource pools in one RB set.

[0869] Preferably, in some embodiments, an alternative is that each RB set may be (pre)configured with a maximum number of TDM side link resource pools. Preferably, in some embodiments, another alternative is that the number of (pre)configured TDM side link resource pools per RB set of all RB sets in the SL BWP should be less than or equal to the number of (pre)configured TDM side link resource pools in one RB set. Preferably, in some embodiments, all RB sets are associated with the same number of (pre)configured TDM side link resource pools in one RB set.

[0870] Preferably, in some embodiments, the maximum number of (pre-)configured TDM side link resource pools in one RB set in the SL BWP is 2.

[0871] The seventh concept is that when the candidate (multi-TTI) resources including several consecutive logical TTIs in the resource selection window are divided into at least two parts or subsets of TTIs in the actual system, the candidate (multi-TTI) resources are not determined as (valid / identified / remaining / initialized) candidate (multi-TTI) resources. The UE performing resource identification and selection will exclude such resources from the (valid / identified) candidate (multi-TTI) resource set. Preferably, in some embodiments, when the candidate (multi-TTI) resources including several consecutive logical TTIs in the resource selection window do not include several physically consecutive TTIs, the candidate (multi-TTI) resources are excluded from the (valid / identified / remaining / initialized) candidate (multi-TTI) resource set. Preferably, in some embodiments, when the candidate (multi-TTI) resources including several consecutive logical TTIs in the resource selection window are not continuous in the time domain, the candidate (multi-TTI) resources are excluded from the (valid / identified / remaining / initialized) candidate (multi-TTI) resource set. The candidate (multi-TTI) resource set (after performing resource exclusion) is reported to the higher layer of the UE. The candidate (multi-TTI) resource set includes candidate (multi-TTI) resources, including several consecutive logical TTIs in the resource selection window and having RSRP below the threshold. Preferably, in some embodiments, the cardinality or size of the candidate (multi-TTI) resource set is at least X%*the total number of candidate (multi-TTI) resources in the resource selection window.

[0872] In an alternative, when the candidate (multi-TTI) resources including several consecutive logical TTIs in the resource selection window are divided into at least two parts or subsets of TTIs in the actual system, the UE does not count the candidate (multi-TTI) resources as the total number of (remaining) candidate (multi-TTI) resources in the resource selection window. Preferably, in some embodiments, when the candidate (multi-TTI) resources including several consecutive logical TTIs in the resource selection window do not include several physically consecutive TTIs, the UE does not count the candidate (multi-TTI) resources as the total number of (remaining) candidate (multi-TTI) resources in the resource selection window. Preferably, in some embodiments, when the candidate (multi-TTI) resources including several consecutive logical TTIs in the resource selection window are not consecutive in the time domain, the UE does not count the candidate (multi-TTI) resources as the total number of (remaining) candidate (multi-TTI) resources in the resource selection window. Preferably, in some embodiments, the total number of candidate (multi-TTI) resources is shown as M total (For example, the numbering comes from step 1 in section 8.1.4 of TS 38.214).

[0873] The proposed text is provided below in underlined and bold text.

[0874]

[0875] In a second alternative, the UE counts the candidate resources as the total number of (remaining) candidate (multi-TTI) resources in the resource selection window (for simplicity) and when initiating the candidate (multi-TTI) resource set, the UE excludes the candidate (multi-TTI) resources. Preferably, in some embodiments, when the candidate (multi-TTI) resources comprising several consecutive logical TTIs in the resource selection window do not include several physically consecutive TTIs, when initiating the candidate (multi-TTI) resource set, the UE excludes the candidate (multi-TTI) resources, or the candidate (multi-TTI) resources are not included in the initialization candidate (multi-TTI) resource set. Preferably, in some embodiments, when the candidate (multi-TTI) resources comprising several consecutive logical TTIs in the resource selection window are not consecutive in the time domain, when initiating the candidate (multi-TTI) resource set, the UE excludes the candidate (multi-TTI) resources, or the candidate (multi-TTI) resources are not included in the initialization candidate (multi-TTI) resource set. Preferably, in certain embodiments, the candidate (multi-TTI) resource set corresponds to set SA (eg, numbering from step 4 in section 8.1.4 in TS 38.214).

[0876] The proposed text is provided below in underlined and bold text.

[0877]

[0878] In a third alternative, the UE counts the candidate (multi-TTI) resources as the total number of candidate (multi-TTI) resources in the resource selection window (for simplicity) and when determining the (valid / identified) candidate (multi-TTI) resource set, the UE excludes the candidate (multi-TTI) resources. Preferably, in some embodiments, when the candidate (multi-TTI) resources comprising several consecutive logical TTIs in the resource selection window do not include several physically consecutive TTIs, when determining the (valid / identified) candidate (multi-TTI) resource set, the UE excludes the candidate (multi-TTI) resources. Preferably, in some embodiments, when the candidate (multi-TTI) resources comprising several consecutive logical TTIs in the resource selection window are not consecutive in the time domain, when determining the (valid / identified) candidate (multi-TTI) resource set, the candidate (multi-TTI) resources are excluded. Preferably, in some embodiments, the candidate resource set corresponds to the set SA (e.g., the numbering comes from step 5x or step 6x in section 8.1.4 in TS 38.214).

[0879] The proposed text is presented below in underlined and bold text.

[0880]

[0881] Preferably, in certain embodiments, the candidate (multi-TTI) resources are separated by (real / physical) time slots that are not associated with a sidelink resource pool.

[0882] Preferably, in some embodiments, there are some further conditions that determine whether to exclude candidate (multi-TTI) resources. Preferably, in some embodiments, some further conditions may be CBR, higher layer configuration and / or number of 3dB RSRP threshold increments.

[0883] When the number of 3dB RSRP threshold increments is greater than the number threshold, the UE does not exclude candidate (multi-TTI) resources (eg, does not perform step 5× or step 6×). In other words, when the number of 3dB RSRP threshold increments is not greater than the number threshold, the UE excludes candidate (multi-TTI) resources.

[0884] In a fourth alternative, the candidate multi-slot resource definition is updated. Preferably, in some embodiments, when the multi-slot resource includes a N starts with (which means the beginning of the resource starts from a time slot belonging to the sidelink resource pool used for resource selection) but includes time slots that do not belong to the sidelink resource pool slot,MCSt When the time slots are continuous, the multi-slot resources are not determined or defined as candidate multi-slot resources. Preferably, in some embodiments, the candidate multi-slot resource set corresponds to the set S A (eg numbering from step 4 in section 8.1.4 of TS 38.214) Resources are not included.

[0885] The following text proposals are provided in underlined and bold format. Preferably, in some embodiments, the following TP is allowed Figure 8 R 3,3 But not allowed Fig. 9 R 3,3 .

[0886]

[0887] The following text proposals are provided in underlined and bold format. Preferably, in some embodiments, the following TP is not allowed Figure 8 R 3,3 And not allowed Fig. 9 R 3,3 Both.

[0888]

[0889] Preferably, in some embodiments, for the frequency domain definition of the candidate multi-slot resource, when the length of the multi-slot resource with a subchannel or when the length of the multi-slot resource with an RB set exceeds the frequency boundary of the sidelink resource pool, the following text proposal is used to determine that the multi-slot resource is not defined or determined as a candidate multi-slot resource. Preferably, in some embodiments, the candidate multi-slot resource (in the frequency domain) is determined to be within the frequency resources in the sidelink resource pool (e.g., a subchannel for a contiguousRB structure, or both a subchannel and an RB set for an interlaceRB structure).

[0890] The proposed text is provided below in underlined and bold text.

[0891]

[0892] For example, in Figure 8 or Fig. 9 In the case where the resource selection window includes TTIs that belong to the sidelink resource pool and TTIs that do not belong to the sidelink resource pool, the candidate resources for determining multiple TTIs for sidelink transmission in the sidelink resource pool should be enhanced. Figure 8 sparse TTIs for candidate resources (but contiguous in the logical domain) are shown, causing the UE to perform an additional type 1 channel access procedure for accessing the channel. Fig. 9 Candidate resources are shown starting from a TTI in the sidelink resource pool but including / having a TTI outside the sidelink resource pool, such candidate resources are harmful to the UE because the number of opportunities for the UE to perform sidelink transmission in the unlicensed spectrum is reduced.

[0893] The eighth concept is that there may be different treatments of the UE when the UE selects multi-TTI sidelink resources that are not contiguous in the time domain. The UE may determine or select multi-TTI sidelink resources based on Mode 2 sensing and / or resource identification and / or resource selection for the sidelink resource pool.

[0894] When the multi-TTI sidelink resources include at least one TTI that is not associated with the sidelink resource pool, the UE is not allowed to (attempt to) use the at least one TTI. Alternatively, when the multi-TTI sidelink resources include at least one TTI that is not associated with the sidelink resource pool, but the UE needs to transmit selected or reserved resources or S-SSB, the UE is allowed to (attempt to) use the at least one TTI. Preferably, in some embodiments, the at least one TTI is the remaining part of the multi-TTI sidelink resources or the later part of the multi-TTI sidelink resources in the time domain.

[0895] When the multi-TTI sidelink resource includes at least one TTI associated with the sidelink resource pool, and the at least TTI is discontinuously separated from a portion (e.g., a previous / previous portion) of the multi-TTI sidelink resource, the UE is not allowed to (attempt to) use the at least one TTI. Alternatively, when the multi-TTI sidelink resource includes at least one TTI associated with the sidelink resource pool, and the at least one TTI is discontinuously separated from a portion (e.g., a previous / previous portion) of the multi-TTI sidelink resource, the UE is not allowed to (attempt to) use the at least one TTI. In one example, the at least one TTI is the remaining portion of the multi-TTI sidelink resource or a later portion of the multi-TTI sidelink resource in the time domain.

[0896] When the UE performs one or more sidelink transmissions via a multi-TTI sidelink resource and when the UE stops the sidelink transmission in at least one TTI of the multi-TTI (e.g., the at least one TTI is not associated with a sidelink resource pool, and / or the UE does not reserve / select another sidelink resource in the at least one TTI), the UE is not allowed to keep utilizing the remaining resources of the multi-TTI sidelink resource after the at least one TTI. The UE may consider the COT in the at least one TTI stopped. In order to utilize the remaining resources (which may or may not be associated with a sidelink resource pool), the UE may need to initiate a new COT via a type 1 channel access.

[0897] Throughout this disclosure, unlicensed spectrum corresponding UEs need to perform type 1 / 2 / 2A / 2B / 2C channel access procedures before sidelink transmission.

[0898] Throughout this disclosure, unlicensed spectrum may be replaced with UEs that are (pre-)configured with RB sets or guard bands or interleaving structures for subchannels.

[0899] Throughout this disclosure, actual / physical time slots correspond to using time slots in a real-time manner.

[0900] Throughout this disclosure, a logical time slot corresponds to a time slot associated with one sidelink resource pool or configured for use with a sidelink.

[0901] Throughout this disclosure, the actual / physical timeslots in a carrier / cell are a superset of the logical timeslots in the carrier / cell.

[0902] Throughout the present disclosure, a UE corresponding UE sharing a COT transmits a level 1 SCI having a frequency assignment indicating RB set information associated with the COT and a level 2 SCI having remaining COT information.

[0903] Throughout this disclosure, level 1 SCI and level 2 SCI are transmitted in the same TTI.

[0904] Throughout this disclosure, the same TTI is the last TTI of the first part of the COT, where the originating UE has data to transmit in the COT.

[0905] Throughout the present disclosure, the COT may be divided into a first part, a second part, and a third part, and the COT initiating UE may signal / indicate the remaining COT duration used to determine the end point of the second part of the COT. Preferably, in some embodiments, the first part of the COT is used for the transmission of the COT initiating UE. Preferably, in some embodiments, the second part of the COT is used to respond to the transmission of the UE (e.g., the COT initiating UE will perform sidelink reception). Preferably, in some embodiments, the third part of the COT is used for the transmission of the COT initiating UE. Preferably, in some embodiments, in some instances, the COT may not include the third part of the COT. Preferably, in some embodiments, in some instances, when the COT initiating UE does not share the COT (e.g., signals / indicates that there is no remaining COT duration or the remaining COT duration is zero), the second part of the COT does not exist.

[0906] Throughout this disclosure, after a responding UE performs a successful Type 2 / 2A / 2B / 2C channel access procedure (for sidelink transmissions), the responding UE performs sidelink transmissions using the shared COT.

[0907] Throughout this disclosure, a COT initiating UE initiates COT after the COT initiating UE performs a successful Type 1 channel access procedure.

[0908] Throughout this disclosure, TTI, time slot, mini-time slot, subframe, number of symbols may be used interchangeably.

[0909] Throughout this disclosure, greater than, more than, and equal to are used interchangeably.

[0910] Throughout this disclosure, S-SSBs are transmitted in a periodic manner and / or periodically, and the periodicity is (pre-)configured.

[0911] Throughout this disclosure, an S-SSB is transmitted in one or more TTIs (in one period of an S-SSB), and the number of the one or more TTIs is (pre-)configured.

[0912] Throughout this disclosure, S-SSBs are transmitted in several RB sets in a SL BWP (when the UE has a successful channel access procedure for several RB sets). Preferably, in certain embodiments, the several RB sets are a subset of all RB sets in the SL BWP or all RB sets in the SL BWP.

[0913] Throughout this disclosure, for one RB set, S-SSBs are transmitted in a repeated manner to equally span one RB set (in order to meet occupied channel bandwidth (OCB) requirements in regulation).

[0914] refer to Fig.10 , under this and other concepts, systems and methods of the present invention, a method 1000 for a first UE / device in a wireless communication system includes: receiving a configuration for configuring more than one side link resource pool including a first side link resource pool and a second side link resource pool, wherein the more than one side link resource pool is associated with a SL BWP in an unlicensed spectrum, and an EDT for COT sharing is separately (pre)configured for each of the more than one side link resource pools (step 1002); selecting one or more resources for side link transmission in the first side link resource pool, wherein a first resource of the one or more resources is in TTI or time slot i, and there is a second resource in a future / next TTI or time slot i+1, and both the first resource and the second resource are associated with a same RB set, or both the first resource and the second resource are in a same RB set (step 1004); determining an EDT for a type 1 channel access procedure (for a same RB set) to initiate a COT including both TTI i and TTI i+1 (step 1006); and preferably, in some embodiments, in TTI i The SCI is transmitted on TTI i, wherein the SCI provides COT sharing information including a remaining COT duration with TTI i+1 (step 1008).

[0915] Preferably, in some embodiments, the determination of the EDT is based on a higher value of the (pre)configured EDT for the first side link resource pool and the second side link resource pool, and / or when the (pre)configured EDT for COT sharing for the first side link resource pool is less than the (pre)configured EDT for COT sharing for the second side link resource pool, the first UE determines the EDT to be the (pre)configured EDT for COT sharing for the second side link resource pool, and / or when the (pre)configured EDT for COT sharing for the first side link resource pool is higher than the (pre)configured EDT for COT sharing for the second side link resource pool, the first UE determines the EDT to be the (pre)configured EDT for COT sharing for the second side link resource pool, and / or when the (pre)configured EDT for COT sharing for the first side link resource pool is higher than the (pre)configured EDT for COT sharing for the second side link resource pool. When the side link resource pool is (pre)configured with an EDT for COT sharing, the first UE determines the EDT to be the EDT for COT sharing (pre)configured for the first side link resource pool, and / or in one instance, when the EDT for COT sharing for the first side link resource pool is (pre)configured to -60dBm and the EDT for COT sharing for the second side link resource pool is (pre)configured to -50dBm, the first UE determines the EDT for the type 1 channel access procedure based on the EDT associated with the second side link resource pool (e.g., -50dBm).

[0916] Preferably, in certain embodiments, different selections correspond to different TBs or MAC PDUs, and / or different selections correspond to separate resource identification and selection procedures.

[0917] Preferably, in some embodiments, one resource corresponds to one TTI or one time slot in one or more sidelink resource pools, and / or one or more resources used for sidelink transmission are in contiguous TTIs or time slots.

[0918] Preferably, in some embodiments, at least one RB set (e.g., an identical RB set) is a time domain divided by the first side link resource pool and the second side link resource pool, and / or the at least one RB set is a time domain divided by the first side link resource pool and the second side link resource pool corresponding to a time slot level or TTI level partition, and / or a TTI or a time slot having an RB set is not shared with more than one side link resource pool at the same time.

[0919] Preferably, in some embodiments, the first UE monitors the SCI in the second side link resource pool in TTI i+1.

[0920] Preferably, in certain embodiments, the first UE has sidelink data to be transmitted and initiates COT via a Type 1 channel access procedure.

[0921] Preferably, in certain embodiments, the sidelink data is associated with an L1 priority associated with the CAPC.

[0922] Preferably, in certain embodiments, based on the associated CAPC, the first UE determines a maximum duration of the COT.

[0923] Preferably, in certain embodiments, when the maximum duration of the COT includes both TTI i and TTI i+1, the first UE determines the EDT based on the larger (pre-)configured one associated with the first side link resource pool and the second side link resource pool.

[0924] Preferably, in some embodiments, for the selected one or more resources, the first UE attempts to transmit all selected resources from the earliest resource among the selected one or more resources.

[0925] Preferably, in some embodiments, for MCSt, the first UE selects one or more additional resources in the second side link resource pool.

[0926] Preferably, in certain embodiments, once the first UE has a MCSt including both the first side link resource pool and the second side link resource pool, the first UE does not transmit an SCI with COT sharing information in TTI i, and instead, the first UE may transmit another SCI with COT sharing information in TTI i+1 or once the first UE does not have the selected side link resource in the COT.

[0927] Preferably, in certain embodiments, if the EDT of the type 1 channel access procedure is greater than one EDT (pre-)configured for the second side link resource pool, the first UE shares the COT including TTI i+1.

[0928] Preferably, in certain embodiments, if the EDT of the type 1 channel access procedure is less than one EDT (pre-)configured for the second side link resource pool, then the first UE is not allowed to share the COT including TTI i+1.

[0929] Preferably, in certain embodiments, if the EDT determined for the type 1 channel access procedure is at least based on or equal to the (pre-)configured EDT for the first sidelink resource pool, then the first UE shares at least the COT including TTI i.

[0930] Preferably, in certain embodiments, if the EDT determined for the type 1 channel access procedure is at least based on or equal to the (pre)configured EDT for the first side link resource pool and the (pre)configured EDT for the first side link resource pool is greater than the (pre)configured EDT for the second side link resource pool, then the first UE shares the COT including TTI i+1, and / or the remaining COT duration (set in the SCI) covers both TTI i and TTI i+1 (the two TTIs belong to different side link resources in one RB set).

[0931] Preferably, in certain embodiments, if the EDT determined for the type 1 channel access procedure is at least based on or equal to the (pre-)configured EDT for the first side link resource pool and the (pre-)configured EDT for the first side link resource pool is less than the (pre-)configured EDT for the second side link resource pool, then the first UE is not allowed to share the COT including TTI i+1, and / or the remaining COT duration (set in the SCI) is not allowed to cover both TTI i and TTI i+1 (the two TTIs belong to different side link resources in one RB set).

[0932] Preferably, in some embodiments, no matter which EDT the first UE uses to perform the type 1 channel access procedure, the first UE (may) initiate a COT including TTI i and TTI i+1 (the two TTIs belong to different side link resources in one RB set).

[0933] Preferably, in certain embodiments, the first UE performs sidelink transmission using resources in TTI i and TTI i+1, wherein the TB or MAC PDU transmitted at TTI i is different from the TB or MAC PDU transmitted at TTI i+1.

[0934] Preferably, in certain embodiments, a parameter is indicated by a higher layer of the first UE to indicate the number of consecutive TTIs in a bundle of one TB or MAC PDU.

[0935] Preferably, in certain embodiments, when the first UE identifies a set of candidate resources in the first sidelink resource pool (within a resource selection window), the first UE determines candidate resources (for such bundles) that include a number of consecutive TTIs in the bundle.

[0936] Preferably, in some embodiments, when a parameter indicates more than one, one candidate resource includes several consecutive TTIs in a bundle.

[0937] Return to reference Figure 3 and 4In one or more embodiments, from the perspective of a first UE / device in a wireless communication system, the apparatus 300 includes program code 312 stored in a memory 310 of a transmitter. The CPU 308 executable program code 312 is to: (i) receive a configuration for configuring more than one side link resource pool including a first side link resource pool and a second side link resource pool, wherein the more than one side link resource pool is associated with a SL BWP in an unlicensed spectrum, and an EDT for COT sharing is separately (pre)configured for each of the more than one side link resource pools; (ii) select one or more resources for side link transmission in the first side link resource pool, wherein a first resource among the one or more resources is in TTI or time slot i, and there is a second resource in the future / next TTI or time slot i+1, and both the first resource and the second resource are associated with a same RB set, or both the first resource and the second resource are in a same RB set; (iii) determine an EDT for a type 1 channel access procedure (for a same RB set) to initiate a COT including both TTI i and TTI i+1; and (iv) preferably, in some embodiments, transmit an SCI on TTI i, wherein the SCI provides COT sharing information including a remaining COT duration with TTI i+1. Furthermore, CPU 308 may execute program code 312 to perform all described actions, steps, and methods described above, below, or elsewhere herein.

[0938] refer to Fig.11 , under this and other concepts, systems and methods of the present invention, a method 1010 for a first UE / device in a wireless communication system includes: receiving a configuration for configuring a first side link resource pool in an unlicensed / shared spectrum (step 1012); triggering or requesting sensing-based resource (re)selection to perform PSSCH / PSCCH transmission in the first side link resource pool, wherein a parameter is provided or determined to indicate the number of consecutive TTIs in a bundle of a TB or MAC PUD (step 1014); determining a candidate resource set including TTIs associated with the first side link resource pool and TTIs not associated with the first side link resource pool in a resource selection window (step 1016); selecting one or more resources for side link transmission in the first side link resource pool (step 1018); and performing PSSCH / PSCCH transmission on at least one of the selected side link resources (step 1020).

[0939] Preferably, in certain embodiments, the number of valid / identified / remaining candidate multi-TTI resources is greater than or equal to X·Mtotal, where X is a configured value or ratio, and Mtotal is the total number of initialized candidate multi-TTI resources in part of one or more RB sets or the total number of initialized candidate single-TTI resources in part of one or more RB sets.

[0940] Preferably, in some embodiments, the resource selection window corresponds to 1, 5, 10, 20 milliseconds, and / or the resource selection window includes TTIs belonging to the second side link resource pool, TTIs for S-SSB, TTIs for Uu interfaces (e.g., DL, UL) and / or reserved purpose TTIs.

[0941] Preferably, in some embodiments, when the first resource is the beginning of a TTI associated with a first side link resource pool and has several consecutive TTIs including at least one TTI that does not belong to the first side link resource pool, the first resource is excluded from or not included in the candidate resource set.

[0942] Preferably, in some embodiments, when the first resource is the beginning of a TTI associated with the first side link resource pool and has several consecutive TTIs including at least one TTI that does not belong to the first side link resource pool, the first resource is not determined or defined as a candidate multi-TTI resource.

[0943] Return to reference Figure 3 and 4 In one or more embodiments, from the perspective of a first UE / device in a wireless communication system, the device 300 includes program code 312 stored in a memory 310 of a transmitter. The CPU 308 can execute the program code 312 to: (i) receive a configuration for configuring a first side link resource pool in an unlicensed / shared spectrum; (ii) trigger or request a sensing-based resource (re)selection to perform PSSCH / PSCCH transmission in the first side link resource pool, wherein a parameter is provided or determined as indicating the number of consecutive TTIs in a bundle of a TB or MAC PUD; (iii) determine a candidate resource set including TTIs associated with the first side link resource pool and TTIs not associated with the first side link resource pool in a resource selection window; (iv) select one or more resources for side link transmission in the first side link resource pool; and (v) perform PSSCH / PSCCH transmission on at least one of the selected side link resources. In addition, the CPU 308 can execute the program code 312 to perform all described actions, steps and methods described above, below or elsewhere herein.

[0944] refer to Fig.12, under this and other concepts, systems and methods of the present invention, a method 1030 for a first UE in a wireless communication system includes: receiving a configuration for configuring one or more side link resource pools including a first side link resource pool, wherein the first side link resource pool is configured in a first carrier associated with an unlicensed or shared spectrum or configured in an unlicensed or shared spectrum (step 1032); triggering or requesting sensing-based resource selection or reselection to perform one or more side link transmissions in the first side link resource pool, wherein a parameter is provided or determined or used to indicate that a second number of consecutive TTIs is greater than one (step 1034); determining a candidate resource set, including: determining a first number in a resource selection window candidate resources, wherein the first number of candidate resources includes only candidate resources in which each candidate resource starts at a TTI associated with a first side link resource pool and has a second number of consecutive TTIs in the first side link resource pool, and the second number of consecutive TTIs are consecutive in the physical TTI; and determining a candidate resource set from the first number of candidate resources, wherein the number of third candidate resources in the candidate resource set is greater than or equal to X% of the number of first candidate resources (step 1036); selecting one or more resources for side link transmission in the first side link resource pool from the candidate resource set (step 1038); and performing side link transmission on at least one of the selected one or more resources (step 1040).

[0945] In various embodiments, the resource selection window includes TTIs associated with the first side link resource pool and TTIs not associated with the first side link resource pool, or the resource selection window includes TTIs associated with the first side link resource pool, wherein TTI n and TTI n+1 in the TTIs associated with the first side link resource pool may or may not be physically continuous in the time domain, and / or the first side link resource pool includes a single RB set, and / or the first side link resource pool is associated with one RB set.

[0946] In various embodiments, the TTI not associated with the first side link resource pool corresponds to any one of a Uu TTI, a TTI associated with the second side link resource pool, or a TTI of an S-SSB, and / or the first side link resource pool includes a subset of TTIs in the first carrier, and / or the subset of TTIs in the first carrier includes at least two TTIs that are not consecutive in a physical TTI.

[0947] In various embodiments, the sidelink transmission is performed in response to a successful channel access procedure, and / or the first UE initiates a COT including one or more TTIs of the selected one or more resources, and / or the sidelink transmission is performed including PSCCH and / or PSSCH.

[0948] In various embodiments, X% corresponds to or is configured by one sl-TxPercentage, and / or X% indicates a portion of candidate resources that exceeds the first number of candidate resources.

[0949] In various embodiments, the first number of candidate resources in the resource selection window corresponds to the total number of candidate resources associated with the first side link resource pool in the resource selection window, and / or the first UE determines the set of candidate resources at least by performing exclusion of candidate resources from the first number of candidate resources based on one or more sensing results.

[0950] In various embodiments, the first candidate resources start at a TTI associated with the first side link resource pool and have a second number of consecutive TTIs in the first side link resource pool, and if the second number of consecutive TTIs in the first side link resource pool are not consecutive in the physical TTI, then the first number of candidate resources does not include the first candidate resource, and / or if the second number of consecutive TTIs in the first side link resource pool are consecutive in the physical TTI, then the first number of candidate resources includes the first candidate resource, and / or at least when the TTI n of the first candidate resource and the TTI n+1 of the first candidate resource are not physically consecutive in the time domain, the first number of candidate resources does not include the first candidate resource.

[0951] In various embodiments, the second candidate resources start at a TTI associated with the first side link resource pool and have a second number of physically consecutive TTIs, and / or if the second number of physically consecutive TTIs includes a TTI that is not associated with the first side link resource pool, then the first number of candidate resources does not include the second candidate resources, and / or if the second number of physically consecutive TTIs includes only TTIs associated with the first side link resource pool, then the first number of candidate resources includes the second candidate resources, and / or at least when one TTI of the second candidate resources is not associated with the first side link resource pool, the first number of candidate resources does not include the second candidate resources.

[0952] In various embodiments, a first UE receives one or more configurations for configuring one or more thresholds for inter-UE COT sharing, wherein the one or more configurations are configured per carrier.

[0953] In various embodiments, when both the first side link resource pool and the second side link resource pool are configured in the first carrier, the first side link resource pool and the second side link resource pool are associated with the same energy detection threshold for inter-UE COT sharing.

[0954] In various embodiments, when the first side link resource pool and the second side link resource pool are configured in different carriers, the first side link resource pool and the second side link resource pool are associated with the same or different energy detection thresholds for inter-UE COT sharing.

[0955] In various embodiments, if a first UE receives COT sharing information from a second UE in a second side link resource pool and the remaining TTIs in the second COT according to the COT sharing information include at least one of the selected one or more resources, then the first UE performs a channel access procedure according to an energy detection threshold for inter-UE COT sharing.

[0956] Return to reference Figure 3 and 4 In one or more embodiments, from the perspective of a first UE in a wireless communication system, the device 300 includes a program code 312 stored in a memory 310 of the transmitter. The CPU 308 can execute the program code 312 to: (i) receive a configuration for configuring one or more side link resource pools including a first side link resource pool, wherein the first side link resource pool is configured in a first carrier associated with an unlicensed or shared spectrum or configured in an unlicensed or shared spectrum; (ii) trigger or request a sensing-based resource selection or reselection to perform one or more side link transmissions in the first side link resource pool, wherein a parameter is provided or determined or used to indicate that the second consecutive TTI number is greater than one; (iii) determine a candidate resource set, including: determining a first number of candidate resources in a resource selection window, wherein the first The method of claim 31 , wherein the number of candidate resources includes only candidate resources each of which starts at a TTI associated with a first side link resource pool and has a second number of consecutive TTIs in the first side link resource pool, and the second number of consecutive TTIs are consecutive in physical TTIs; determining a candidate resource set from the first number of candidate resources, wherein the number of third candidate resources in the candidate resource set is greater than or equal to X% of the number of first candidate resources; (iv) selecting one or more resources for side link transmission in the first side link resource pool from the candidate resource set; and (v) performing side link transmission on at least one of the selected one or more resources. In addition, the CPU 308 can execute program code 312 to perform all described actions, steps, and methods described above, below, or elsewhere herein.

[0957] refer to Fig.13, under this and other concepts, systems and methods of the present invention, a method 1050 for a first UE in a wireless communication system includes: receiving a configuration for configuring one or more side link resource pools including a first side link resource pool, wherein the first side link resource pool is configured in a first carrier associated with an unlicensed or shared spectrum or configured in an unlicensed or shared spectrum (step 1052); triggering or requesting sensing-based resource selection or reselection to perform one or more side link transmissions in the first side link resource pool, wherein a parameter is provided or determined or used to indicate that the second number of consecutive TTIs is greater than one (step 1054); determining a candidate resource set, including: determining a first number of candidate resources in a resource selection window, wherein the first number of candidate resources is greater than one (step 1055); determining a candidate resource set, including: determining a first number of candidate resources in a resource selection window, wherein the first number of candidate resources is greater than one (step 1056); determining a candidate resource set, wherein the first number of candidate resources is greater than one (step 1057); determining a candidate resource set, wherein the first number of candidate resources is greater than one (step 1058); determining a candidate resource set, wherein the first number of candidate resources is greater than one (step 1059); determining a candidate resource set, wherein the first number of candidate resources is greater than one (step 1060); determining a candidate resource set, wherein the first number of candidate resources is greater than one (step 1061); determining a candidate resource set, wherein the first number of candidate resources is greater than one (step 1062); determining a candidate resource set, wherein the first number of candidate resources is greater than one (step 1063); determining a candidate resource set, wherein the first number of candidate resources is greater than one (step 1064); determining a candidate resource set, wherein the first number of candidate resources is greater than one (step 1065); determining a candidate resource set, wherein the first number of candidate resources is greater than one (step 1066); determining a candidate resource set, wherein the first number of candidate resources is greater than one (step The first number of candidate resources in the first side link resource pool does not include a first candidate resource starting at a TTI associated with the first side link resource pool and having a second number of consecutive TTIs in the first side link resource pool, and at least two consecutive TTIs of the second number of consecutive TTIs of the first candidate resource are discontinuous in the physical TTI; and determining a candidate resource set from the first number of candidate resources, wherein the number of third candidate resources in the candidate resource set is greater than or equal to X% of the number of first candidate resources (step 1056); selecting one or more resources for side link transmission in the first side link resource pool from the candidate resource set (step 1058); and performing side link transmission on at least one of the selected one or more resources (step 1060).

[0958] In various embodiments, the resource selection window includes TTIs associated with the first side link resource pool and TTIs not associated with the first side link resource pool, or the resource selection window includes TTIs associated with the first side link resource pool, wherein TTI n and TTI n+1 in the TTIs associated with the first side link resource pool may or may not be physically continuous in the time domain, and / or the first side link resource pool includes a single RB set, and / or the first side link resource pool is associated with one RB set.

[0959] In various embodiments, the TTI not associated with the first side link resource pool corresponds to any one of a Uu TTI, a TTI associated with the second side link resource pool, or a TTI of an S-SSB, and / or the first side link resource pool includes a subset of TTIs in the first carrier, and / or the subset of TTIs in the first carrier includes at least two TTIs that are not consecutive in a physical TTI.

[0960] In various embodiments, at least two consecutive TTIs are in the first side link resource pool and are separated by a TTI not associated with the first side link resource pool.

[0961] In various embodiments, the first number of candidate resources does not include second candidate resources starting at a TTI associated with the first side link resource pool and having a second number of physically consecutive TTIs, and the second number of physically consecutive TTIs includes at least TTIs not associated with the first side link resource pool.

[0962] In various embodiments, the sidelink transmission is performed in response to a successful channel access procedure, and / or the first UE initiates a COT including one or more TTIs of the selected one or more resources, and / or the sidelink transmission is performed including PSCCH and / or PSSCH.

[0963] In various embodiments, X% corresponds to or is configured by one sl-TxPercentage, and / or X% indicates a portion of candidate resources that exceeds the first number of candidate resources.

[0964] In various embodiments, the first number of candidate resources in the resource selection window corresponds to the total number of candidate resources associated with the first side link resource pool in the resource selection window, and / or the first number of candidate resources is determined at least by excluding any candidate resources that start at a TTI associated with the first side link resource pool and have a second number of consecutive TTIs in the first side link resource pool, and at least two consecutive TTIs of the second number of consecutive TTIs of any candidate resource are not consecutive in a physical TTI, and / or the first UE determines the set of candidate resources at least by performing exclusion of candidate resources from the first number of candidate resources based on one or more sensing results.

[0965] Return to reference Figure 3 and 4In one or more embodiments, from the perspective of a first UE in a wireless communication system, the device 300 includes a program code 312 stored in a memory 310 of the transmitter. The CPU 308 can execute the program code 312 to: (i) receive a configuration for configuring one or more side link resource pools including a first side link resource pool, wherein the first side link resource pool is configured in a first carrier associated with an unlicensed or shared spectrum or configured in an unlicensed or shared spectrum; (ii) trigger or request a sensing-based resource selection or reselection to perform one or more side link transmissions in the first side link resource pool, wherein a parameter is provided or determined or used to indicate that the second consecutive TTI number is greater than one; (iii) determine a candidate resource set, including: determining a first number of candidate resources in a resource selection window, wherein the first number of candidate resources The method further comprises: (i) selecting a first candidate resource that starts at a TTI associated with a first side link resource pool and has a second number of consecutive TTIs in the first side link resource pool, and at least two consecutive TTIs of the second number of consecutive TTIs of the first candidate resource are discontinuous in a physical TTI; and (ii) determining a candidate resource set from the first number of candidate resources, wherein the number of third candidate resources in the candidate resource set is greater than or equal to X% of the number of first candidate resources; (iv) selecting one or more resources for side link transmission in the first side link resource pool from the candidate resource set; and (v) performing side link transmission on at least one of the selected one or more resources. In addition, the CPU 308 can execute program code 312 to perform all described actions, steps, and methods described above, below, or elsewhere herein.

[0966] In various embodiments, a method in a wireless communication system includes: receiving a configuration for configuring a first side link resource pool; triggering or requesting sensing-based resource selection or reselection to perform one or more side link transmissions in the first side link resource pool, wherein a parameter is provided or determined or used to indicate that a second number of consecutive TTIs is greater than one; determining a set of candidate resources, including: determining a first number of candidate resources in a resource selection window, wherein the first number of candidate resources only includes candidate resources in which each candidate resource starts at a TTI associated with the first side link resource pool and has a second number of consecutive TTIs in the first side link resource pool, and the second number of consecutive TTIs are consecutive in a physical TTI.

[0967] Any combination of the concepts or teachings above or herein may be fully or partially combined or formed into new embodiments. The disclosed details and embodiments may be used to at least (but not limited to) solve the problems mentioned above and herein.

[0968] It should be noted that any of the methods, alternatives, steps, examples and embodiments presented herein may be applied independently, individually and / or in combination with multiple methods, alternatives, steps, examples and embodiments.

[0969] Various aspects of the present disclosure have been described above. It should be clear that the teachings herein can be implemented in a wide variety of forms, and any specific structure, function, or both disclosed herein are only representative. Based on the teachings herein, it should be understood by those skilled in the art that the aspects disclosed herein can be implemented independently of any other aspects, and two or more aspects of these aspects can be combined in different ways. For example, any number of aspects set forth herein can be used to implement a device or practice method. In addition, by using other structures, functionality, or structures and functionality other than one or more aspects of the aspects set forth herein or different from one or more aspects of the aspects set forth herein, this device can be implemented or this method can be practiced. As an example of some of the above concepts, in some aspects, parallel channels can be established based on pulse repetition frequency. In some aspects, parallel channels can be established based on pulse position or offset. In some aspects, parallel channels can be established based on time hopping sequences. In some aspects, parallel channels can be established based on pulse repetition frequency, pulse position or offset, and time hopping sequences.

[0970] Those skilled in the art will appreciate that information and signals may be represented using any of a variety of different technologies and techniques. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description may be represented by voltage, current, electromagnetic waves, magnetic fields or particles, optical fields or particles, or any combination thereof.

[0971] Those of ordinary skill in the art will further appreciate that the various illustrative logical blocks, modules, processors, components, circuits, and algorithm steps described in conjunction with the various aspects disclosed herein may be implemented as electronic hardware (e.g., a digital implementation, an analog implementation, or a combination of the two, which may be designed using source decoding or some other technique), and various forms of programs or design code with instructions (which, for convenience, may be referred to herein as "software" or "software modules"), or a combination of the two. In order to clearly illustrate this interchangeability of hardware and software, various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether such functionality is implemented as hardware or software depends on the specific application and the design constraints imposed on the overall system. Those skilled in the art may implement the described functionality in different ways for each specific application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present disclosure.

[0972] In addition, the various illustrative logical blocks, modules, and circuits described in conjunction with the aspects disclosed herein may be implemented within or performed by an integrated circuit ("IC"), an access terminal, or an access point. An IC may include a general purpose processor, a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, electrical components, optical components, mechanical components, or any combination thereof designed to perform the functions described herein, and may execute code or instructions residing within the IC, outside the IC, or both. A general purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. A processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.

[0973] It should be understood that any specific order or hierarchy of steps in any disclosed process is an example of an exemplary method. It should be understood that based on design preferences, the specific order or hierarchy of steps in a process can be rearranged while remaining within the scope of the present disclosure. The accompanying method claims present elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy presented.

[0974] The steps of the method or algorithm described in conjunction with the various aspects disclosed herein can be implemented directly with hardware, with a software module executed by a processor, or with a combination of the two. Software modules (e.g., including executable instructions and related data) and other data can reside in a data memory, such as a RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, register, hard disk, removable disk, CD-ROM, or any other form of computer-readable storage medium known in the art. An example storage medium can be coupled to a machine such as a computer / processor (for convenience, the machine can be referred to as a "processor" in this article) so that the processor can read information (e.g., code) from the storage medium and write information to the storage medium. An example storage medium can be integrated with a processor. The processor and storage medium can reside in an ASIC. The ASIC can reside in a user device. In an alternative, the processor and storage medium can reside in a user device as discrete components. In addition, in some aspects, any suitable computer program product may include a computer-readable medium, and the computer-readable medium includes a code related to one or more of the various aspects of the present disclosure. In some aspects, a computer program product may include packaging materials.

[0975] Although the present invention has been described in conjunction with various aspects and examples, it will be appreciated that the present invention is capable of further modifications. This application is intended to cover any changes, uses or adaptations of the present invention, which generally follow the principles of the present invention and include such deviations from the present disclosure, which are within the scope of known and customary practice in the technical field to which the present invention belongs.

Claims

1. A method of a first user device, characterized in that: include: receiving a configuration for configuring one or more sidelink resource pools including a first sidelink resource pool configured in a first carrier associated with an unlicensed or shared spectrum or configured in an unlicensed or shared spectrum; triggering or requesting sensing-based resource selection or reselection to perform one or more sidelink transmissions in said first sidelink resource pool, wherein a parameter is provided or determined or used to indicate that the number of second consecutive transmission time intervals is greater than one; Determine the candidate resource set, including: determining a first number of candidate resources in a resource selection window, wherein the first number of candidate resources includes only candidate resources in which each candidate resource starts at a transmission time interval associated with the first sidelink resource pool and has the second number of consecutive transmission time intervals in the first sidelink resource pool, and the second number of consecutive transmission time intervals are consecutive in a physical transmission time interval; and determining the candidate resource set from the first number of candidate resources, wherein the number of third candidate resources in the candidate resource set is greater than or equal to X% of the first number of candidate resources; selecting one or more resources from the candidate set of resources for sidelink transmission in the first sidelink resource pool; and A sidelink transmission is performed on at least one of the selected one or more resources.

2. The method according to claim 1, characterized in that: The resource selection window includes a transmission time interval associated with the first side link resource pool and a transmission time interval not associated with the first side link resource pool, or The resource selection window includes transmission time intervals associated with the first side link resource pool, wherein a transmission time interval n and a transmission time interval n+1 in the transmission time intervals associated with the first side link resource pool may be physically discontinuous in the time domain, and / or The first sidelink resource pool includes a single resource block set, and / or The first side link resource pool is associated with a resource block set.

3. The method according to claim 1, characterized in that: a transmission time interval not associated with the first side link resource pool corresponds to any one of a Uu transmission time interval, a transmission time interval associated with a second side link resource pool, or a transmission time interval for a side link synchronization signal block, and / or The first sidelink resource pool includes a subset of transmission time intervals in the first carrier, and / or The subset of transmission time intervals in the first carrier includes at least two transmission time intervals that are non-contiguous in a physical transmission time interval.

4. The method according to claim 1, characterized in that: said performing of said sidelink transmission is in response to a successful channel access procedure, and / or The first user equipment initiates a channel occupation time of one or more transmission time intervals including the selected one or more resources, and / or The performance of the sidelink transmission includes a physical sidelink control channel and / or a physical sidelink shared channel.

5. The method according to claim 1, characterized in that: X% corresponds to or is configured by an sl-TxPercentage, and / or X% indicates a portion of candidate resources exceeding the first number of candidate resources.

6. The method according to claim 1, characterized in that: The number of the first candidate resources in the resource selection window corresponds to the total number of the candidate resources associated with the first side link resource pool in the resource selection window, and / or The first user equipment determines the set of candidate resources by at least performing candidate resource exclusion from the first number of candidate resources based on one or more sensing results.

7. The method according to claim 1, characterized in that: a first candidate resource starts at a transmission time interval associated with the first side link resource pool and has the second number of consecutive transmission time intervals in the first side link resource pool, and if the second number of consecutive transmission time intervals in the first side link resource pool are not consecutive in a physical transmission time interval, then the first number of candidate resources does not include the first candidate resource, and / or If the second number of consecutive transmission time intervals in the first side link resource pool are consecutive in a physical transmission time interval, then the first number of candidate resources includes the first candidate resource, and / or At least when a transmission time interval n of the first candidate resource and a transmission time interval n+1 of the first candidate resource are not physically continuous in the time domain, the first number of candidate resources does not include the first candidate resource.

8. The method according to claim 1, characterized in that: The second candidate resource starts from a transmission time interval associated with the first sidelink resource pool and has the second number of physically consecutive transmission time intervals, and / or If the second number of physically consecutive transmission time intervals includes transmission time intervals not associated with the first sidelink resource pool, then the first number of candidate resources does not include the second candidate resource, and / or If the second number of physically consecutive transmission time intervals includes only transmission time intervals associated with the first sidelink resource pool, then the first number of candidate resources includes the second candidate resources, and / or At least when one transmission time interval of the second candidate resource is not associated with the first side link resource pool, the first number of candidate resources does not include the second candidate resource.

9. The method according to claim 1, characterized in that: The first user equipment receives one or more configurations for configuring one or more thresholds for channel occupancy time sharing between user equipments, wherein the one or more configurations are configured per carrier.

10. The method according to claim 9, characterized in that When both the first side link resource pool and the second side link resource pool are configured in the first carrier, the first side link resource pool and the second side link resource pool are associated with a same energy detection threshold for channel occupancy time sharing between user equipments.

11. The method according to claim 9, characterized in that When the first side link resource pool and the second side link resource pool are configured in different carriers, the first side link resource pool and the second side link resource pool are associated with the same or different energy detection thresholds for channel occupancy time sharing between user equipments.

12. The method according to claim 10, characterized in that If the first user equipment receives channel occupancy time sharing information from a second user equipment in the second side link resource pool and the remaining transmission time interval in the second channel occupancy time according to the channel occupancy time sharing information includes at least one of the selected one or more resources, then the first user equipment performs a channel access procedure according to the energy detection threshold for channel occupancy time sharing between user equipments.

13. A method of a first user device, characterized in that: include: receiving a configuration for configuring one or more sidelink resource pools including a first sidelink resource pool configured in a first carrier associated with an unlicensed or shared spectrum or configured in an unlicensed or shared spectrum; triggering or requesting sensing-based resource selection or reselection to perform one or more sidelink transmissions in said first sidelink resource pool, wherein a parameter is provided or determined or used to indicate that the number of second consecutive transmission time intervals is greater than one; Determine the candidate resource set, including: determining a first number of candidate resources in a resource selection window, wherein the first number of candidate resources does not include a first candidate resource starting at a transmission time interval associated with the first side link resource pool and having the second number of consecutive transmission time intervals in the first side link resource pool, and at least two consecutive transmission time intervals of the second number of consecutive transmission time intervals of the first candidate resource are non-consecutive in a physical transmission time interval; and determining the candidate resource set from the first number of candidate resources, wherein the number of third candidate resources in the candidate resource set is greater than or equal to X% of the first number of candidate resources; selecting one or more resources from the candidate set of resources for sidelink transmission in the first sidelink resource pool; and A sidelink transmission is performed on at least one of the selected one or more resources.

14. The method according to claim 13, characterized in that: The resource selection window includes a transmission time interval associated with the first side link resource pool and a transmission time interval not associated with the first side link resource pool, or The resource selection window includes transmission time intervals associated with the first side link resource pool, wherein a transmission time interval n and a transmission time interval n+1 in the transmission time intervals associated with the first side link resource pool may be physically discontinuous in the time domain, and / or The first sidelink resource pool includes a single resource block set, and / or The first side link resource pool is associated with a resource block set.

15. The method according to claim 13, characterized in that: a transmission time interval not associated with the first side link resource pool corresponds to any one of a Uu transmission time interval, a transmission time interval associated with a second side link resource pool, or a transmission time interval for a side link synchronization signal block, and / or The first sidelink resource pool includes a subset of transmission time intervals in the first carrier, and / or The subset of transmission time intervals in the first carrier includes at least two transmission time intervals that are non-contiguous in a physical transmission time interval.

16. The method according to claim 13, characterized in that The at least two consecutive transmission time intervals are in the first sidelink resource pool and are separated by a transmission time interval not associated with the first sidelink resource pool.

17. The method according to claim 13, characterized in that The first number of candidate resources does not include second candidate resources starting from a transmission time interval associated with the first side link resource pool and having a second number of physically consecutive transmission time intervals, and the second number of physically consecutive transmission time intervals includes at least transmission time intervals that are not associated with the first side link resource pool.

18. The method according to claim 13, characterized in that: said performing of said sidelink transmission is in response to a successful channel access procedure, and / or The first user equipment initiates a channel occupation time of one or more transmission time intervals including the selected one or more resources, and / or The performance of the sidelink transmission includes a physical sidelink control channel and / or a physical sidelink shared channel.

19. The method according to claim 13, characterized in that: X% corresponds to or is configured by an sl-TxPercentage, and / or X% indicates a portion of candidate resources exceeding the first number of candidate resources.

20. The method according to claim 13, characterized in that: The first number of candidate resources in the resource selection window corresponds to the total number of candidate resources associated with the first side link resource pool in the resource selection window, and / or determining the first number of candidate resources at least by excluding any candidate resource starting at a transmission time interval associated with the first side link resource pool and having the second number of consecutive transmission time intervals in the first side link resource pool, and at least two consecutive transmission time intervals of the second number of consecutive transmission time intervals of any candidate resource are not consecutive in a physical transmission time interval, and / or The first user equipment determines the set of candidate resources by at least performing candidate resource exclusion from the first number of candidate resources based on one or more sensing results.

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