Method and apparatus for delay processing of sidelink reference signal transmission

Abstract

A method and apparatus are provided for delay processing of sidelink reference signal transmission in a wireless communication system, wherein the method includes: configuring a sidelink resource pool for sidelink data transmission and sidelink reference signal transmission; performing a sense-based resource selection for selecting sidelink resources in the sidelink resource pool; determining a set of candidate resources within a first time interval, wherein the first time interval is determined at least based on a first remaining packet delay budget; determining a subset of candidate resources after excluding some candidate resources from the set of candidate resources based on a sensing result; selecting one or more sidelink resources from the subset of candidate resources at least based on a second remaining packet delay budget and a remaining delay budget associated with a first sidelink reference signal; and performing sidelink data transmission and transmission of the first sidelink reference signal on a first sidelink resource among the selected one or more sidelink resources.

Description

[0001] Cross-references to related applications

[0002] This application claims priority and benefit to U.S. Provisional Patent Application No. 63 / 542,988, filed October 6, 2023, which is incorporated herein by reference. Technical Field

[0003] This disclosure generally relates to wireless communication networks, and more specifically, to methods and apparatus for delay processing of sidelink reference signal transmission in wireless communication systems. Background Technology

[0004] With the rapid growth in 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 type of IP packet communication can provide users of mobile communication devices with IP-bearing voice, multimedia, multicast, and video-on-demand communication services.

[0005] An exemplary network architecture is the Evolved Universal Terrestrial Radio Access Network (E-UTRAN). E-UTRAN systems can provide high data throughput to enable the aforementioned IP-based voice and multimedia services. Currently, the 3rd Generation Partnership Project (3GPP)... rd The Generation Partnership Project (3GPP) standards organization is discussing new next-generation (e.g., 5G) radio technologies. Therefore, changes to the current core of the 3GPP standards are currently being submitted and considered to allow for the evolution and completion of the 3GPP standards. Summary of the Invention

[0006] Methods, systems, and apparatuses for delay processing of sidelink reference signal transmission in wireless communication systems are provided. Therefore, when an apparatus or user equipment (UE) performs sense-based resource selection in a shared resource pool, the delay requirements of the sidelink (SL) positioning reference signal (PRS) can be met.

[0007] In various embodiments, a method of a first apparatus in a wireless communication system includes: receiving or having a configuration of a first sidelink resource pool for sidelink data transmission and sidelink reference signal transmission; performing a first sense-based resource selection triggered or requested in a first timing for selecting one or more first sidelink resources in the first sidelink resource pool; determining a first set of candidate resources within a first time interval, wherein the first time interval is determined at least based on a first remaining packet delay budget; determining a first subset of candidate resources after excluding some candidate resources from the first set of candidate resources based on one or more sensing results; selecting the one or more first sidelink resources from the first subset of candidate resources at least based on a second remaining packet delay budget and a remaining delay budget associated with a first sidelink reference signal; and performing first sidelink data transmission and transmission of the first sidelink reference signal on the selected one or more first sidelink resources. Attached Figure Description

[0008] Figure 1 A diagram illustrating a wireless communication system according to an embodiment of the present invention is shown.

[0009] Figure 2 This 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.

[0010] Figure 3 This is a functional block diagram of a communication system according to an embodiment of the present invention.

[0011] Figure 4 This is an embodiment of the present invention. Figure 3 Functional block diagram of the program code.

[0012] Figure 5This is a flowchart of a method using a first apparatus according to an embodiment of the present invention, the method comprising: receiving / having a configuration of a sidelink resource pool for transmitting / receiving a Physical Sidelink Shared Channel (PSSCH) and a Sidelink Positioning Reference Signal (SL PRS); performing a first sense-based resource selection triggered / requested in a first time slot n for selecting one or more sidelink resources in the sidelink resource pool; determining an (initialized) set of candidate single-time slot resources including a plurality of candidate single-time slot resources within a time interval [n+T1, n+T2]; determining a subset of sidelink resources after excluding some candidate single-time slot resources from the (initialized) set of candidate single-time slot resources based on sensing results; selecting one or more sidelink resources from the subset of sidelink resources; performing a first PSSCH transmission carrying a first SL MAC PDU; and performing a first SL PRS transmission on a first sidelink resource among the selected one or more sidelink resources.

[0013] Figure 6 This is a flowchart of a method using a first apparatus according to an embodiment of the present invention, the method comprising: receiving or having a configuration of a first sidelink resource pool for sidelink data transmission and sidelink reference signal transmission; performing a first sense-based resource selection triggered or requested in a first timing for selecting one or more first sidelink resources in the first sidelink resource pool; determining a first candidate resource set within a first time interval; determining a first candidate resource subset after excluding some candidate resources from the first candidate resource set based on one or more sensing results; selecting one or more first sidelink resources from the first candidate resource subset based at least on a second remaining packet delay budget and a remaining delay budget associated with a first sidelink reference signal; and performing first sidelink data transmission and first sidelink reference signal transmission on the first sidelink resources among the selected one or more first sidelink resources. Detailed Implementation

[0014] The invention described herein can be applied to or implemented in the exemplary wireless communication systems and apparatus described below. Furthermore, the invention is described primarily in the context of the 3GPP architecture reference model. However, it should be understood that, with the aid of the disclosed information, those skilled in the art can readily adapt various aspects of the invention to use and implement in 3GPP2 network architectures and other network architectures.

[0015] The exemplary wireless communication systems and apparatus described below employ wireless communication systems that support broadcast services. Wireless communication systems are widely deployed to provide various types of communication, such as voice, data, etc. These systems may be based on code division multiple access (CDMA), time division multiple access (TDMA), orthogonal frequency division multiple access (OFDMA), 3GPP Long Term Evolution (LTE) radio access, 3GPP Long Term Evolution Advanced (LTE-A), 3GPP2 Ultra Mobile Broadband (UMB), WiMax, 3GPP New Radio (NR), or some other modulation techniques.

[0016] Specifically, the exemplary wireless communication systems and apparatus described below can be designed to support one or more standards, such as those provided by an association called the "Third Generation Partnership Project" (referred to herein as 3GPP), including: [1] 3GPP TS 38.213 V18.0.0 (2023-09) 3GPP; TSG RAN; NR; Physical layer procedure for control (version 18); [2] 3GPP TS 38.214 V18.0.0 (2023-09) 3GPP; TSG RAN; NR; Physical layer procedure for data (version 18); [3] 3GPP TS 38.214 V17.6.0 (2023-09) 3GPP; TSG RAN; NR; Physical layer procedure for data (version 17); [4] RP-231460, "New WID for Extended and Improved NR Positioning", Intel; [5] 3GPP TSG The RAN1 report (Chair's Note) of RANWG1#112bis; [6] the RAN1 report of 3GPP TSG RAN WG1#113; and [7] the RAN1 report of 3GPP TSG RAN WG1#114. The standards and documents listed above are hereby expressly and completely incorporated in this document by reference in their entirety.

[0017] Figure 1A multiple access wireless communication system according to an embodiment of the present invention is illustrated. Access network 100 (AN) includes multiple antenna groups, one antenna group comprising 104 and 106, another antenna group comprising 108 and 110, and yet another antenna group comprising 112 and 114. Figure 1 In this diagram, 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, which transmit information to AT 116 via forward link 120 and receive information from AT 116 via reverse link 118. AT 122 communicates with antennas 106 and 108, which 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 communicate using different frequencies. For example, forward link 120 may use a different frequency than reverse link 118. Each antenna group and / or the area in which the antenna groups are designed to communicate is often referred to as a sector of the access network. In this embodiment, each antenna group is designed to communicate with an access terminal in a sector of the area covered by access network 100.

[0018] In communications on forward links 120 and 126, the transmit antennas of access network 100 can utilize beamforming to improve the signal-to-noise ratio of the forward links used for different access terminals 116 and 122. Furthermore, compared to access networks that transmit to all their access terminals via a single antenna, access networks that use beamforming to transmit to access terminals randomly distributed within their coverage area typically cause less interference to access terminals in neighboring cells.

[0019] An AN can be a fixed station or base station used for communication with a terminal, and can also be referred to as an access point, Node B, base station, enhanced base station, eNodeB, or some other term. An AT can also be referred to as a user equipment (UE), wireless communication device, terminal, access terminal, or some other term.

[0020] Figure 2 This is a simplified block diagram of an embodiment of the transmitter system 210 (also referred to as the access network) and receiver system 250 (also referred to as the access terminal (AT) or user equipment (UE)) in the MIMO system 200. At the transmitter system 210, service data for several data streams is provided from the data source 212 to the transmit (TX) data processor 214.

[0021] In one embodiment, each data stream is transmitted via a corresponding transmit antenna. The TX data processor 214 formats, decodes, and interleaves the service data for the data stream based on a specific decoding scheme selected for each data stream to provide decoded data.

[0022] OFDM technology can be used to multiplex the decoded data and pilot data for each data stream. The pilot data is typically a known data pattern processed in a known manner and can be used at the receiver system to estimate the channel response. The multiplexed pilot data and decoded data for each data stream can then be modulated (i.e., symbol mapped) based on a specific modulation scheme (e.g., BPSK, QPSK, M-PK, or M-QAM) selected for each data stream to provide modulation symbols. The data rate, decoding, and modulation for each data stream can be determined by instructions executed by processor 230. Memory 232 is coupled to processor 230.

[0023] Next, the modulation symbols of all data streams are provided to the TX MIMO processor 220, which can further process the modulation symbols (e.g., for OFDM). Then, the TX MIMO processor 220 will... T A modulation symbol stream is provided to N T Transmitters (TMTRs) 222a to 222t. In some embodiments, the TX MIMO processor 220 applies beamforming weights to symbols of the data stream and the antennas from which the symbols are transmitted.

[0024] Each transmitter 222 receives and processes a corresponding symbol stream to provide one or more analog signals, and further modulates the analog signals (e.g., amplification, filtering, and up-conversion) to provide a modulated signal suitable for transmission over a MIMO channel. Then, from N... T Antennas 224a to 224t transmit N from transmitters 222a to 222t. T A modulated signal.

[0025] At receiver system 250, by N R Antennas 252a to 252r receive the transmitted modulated signal and provide the signal received from each antenna 252 to a corresponding receiver (RCVR) 254a to 254r. Each receiver 254 modulates (e.g., filters, amplifies, and down-converts) the corresponding received signal, digitizes the modulated signal to provide a sample, and further processes the sample to provide a corresponding "received" symbol stream.

[0026] Next, the RX data processor 260 from NR Each receiver 254 receives N R N symbol streams and process them based on specific receiver processing techniques. R Each received symbol stream provides N T Each detected symbol stream is then demodulated, deinterleaved, and decoded by the RX data processor 260 to recover the service data used for the data stream. The processing performed by the RX data processor 260 is complementary to the processing performed by the TX MIMO processor 220 and TX data processor 214 at the transmitter system 210.

[0027] Processor 270 periodically determines which pre-decoding matrix to use (discussed below). Processor 270 formulates a reverse link message including a matrix index portion and a rank portion.

[0028] 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 service data for several data streams from the data source 236), modulated by the modulator 280, regulated by the transmitters 254a to 254r, and transmitted back to the transmitter system 210.

[0029] At transmitter system 210, the modulated signal from receiver system 250 is received by antenna 224, conditioned by receiver 222, demodulated by demodulator 240, and processed by RX data processor 242 to extract the reverse link message transmitted by receiver system 250. Next, processor 230 determines which pre-decoding matrix to use to determine beamforming weights and then processes the extracted message.

[0030] Memory 232 can be used to temporarily store some buffered / calculated data from 240 or 242 via processor 230, some buffered data from 212, or some specific program code. Furthermore, memory 272 can be used to temporarily store some buffered / calculated data from 260 via processor 270, some buffered data from 236, or some specific program code.

[0031] See also Figure 3 This figure illustrates an alternative simplified functional block diagram of a communication device according to an embodiment of the present invention. Figure 3 As shown, this can be achieved using the communication device 300 in a wireless communication system. Figure 1The UE (or AT) 116 and 122 are used, 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, program code 312, and a transceiver 314. The control circuit 306 executes the program code 312 in the memory 310 via the CPU 308, thereby controlling the operation of the communication device 300. The communication device 300 can receive signals input by a user via the input device 302 (e.g., a keyboard or keypad) and can output images and sound via the output device 304 (e.g., a monitor or speaker). The transceiver 314 is used to receive and transmit wireless signals, pass the received signals to the control circuit 306, and wirelessly output signals generated by the control circuit 306.

[0032] Figure 4 This is according to an embodiment of the present invention. Figure 3 The diagram shows a simplified block diagram of program code 312. In this embodiment, program code 312 includes an application layer 400, a layer 3 portion 402, and a layer 2 portion 404, and is coupled to a 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 connections.

[0033] For LTE, LTE-A, or NR systems, layer 2, part 404, may include the Radio Link Control (RLC) layer and the Medium Access Control (MAC) layer. Layer 3, part 402, may include the Radio Resource Control (RRC) layer.

[0034] Any two or more of the following paragraphs, (sub)bullets, points, actions, or claims described in each paragraph or section of the invention may be logically, reasonably, and appropriately combined to form a particular method.

[0035] Any sentence, paragraph, (sub)bullet, point, action, or claim described in each paragraph or section of the invention below may be implemented independently and separately to form a particular method or apparatus. Terms such as "based on," "more specifically," and "example" in the following disclosure are merely one possible embodiment and do not limit the specific method or apparatus.

[0036] In TS 38.213 ([1] 3GPP TS 38.213V18.0.0(2023-09) 3GPP; TSG RAN; NR; Physical Layer Procedures for Control (Version 18)), SL-related procedures for control are specified.

[0037] ***************************Quotation[1]Begins*******************************

[0038] 16 UE programs for side links

[0039] The SL BWP (SL BWP) for SL transmission is provided to the UE by SL-BWP-Config or SL-BWP-ConfigCommon, which has the underlying parameters and resource grid defined as described in [4, TS 38.211]. For a resource pool within the SL BWP, several subchannels are provided to the UE by sl-NumSubchannel, where each subchannel contains several adjacent RBs provided by sl-SubchannelSize. The first RB of the first subchannel in the SL BWP is indicated by sl-StartRB-Subchannel. Available time slots for the resource pool are provided by sl-TimeResource and occur periodically at 10240ms. For available time slots without an S-SS / PSBCH block, SL transmission may be initiated from the first symbol indicated by sl-StartSymbol and within several consecutive symbols indicated by sl-LengthSymbols.

[0040] …

[0041] 16.4 UE program for transmitting PSCCH

[0042] The sl-TimeResourcePSCCH can provide the UE with several symbols from the resource pool, starting from the second symbol available for SL transmission in the time slot, and the sl-FreqResourcePSCCH can provide the UE with several Physical Resource Blocks (PRBs) from the resource pool, starting from the lowest PRB index of the lowest subchannel index in the RB set with the lowest index of the associated PSSCH (if applicable), for PSCCH transmission using SCI format 1-A.

[0043] …The settings enable the UE to use sidelink resource allocation mode 2 [6, TS 38.214] to transmit PSCCH using SCI format 1-A.

[0044] -…

[0045] 16.4A UE procedure for transmitting PSCCH in a dedicated resource pool for SL PRS

[0046] For a resource pool dedicated to SL PRS transmission, the sl-TimeResourcePSCCH can provide the UE with several symbols in the resource pool, starting from the second symbol in the time slot that can be used for SL transmission, and the sl-FreqResourcePSCCH can provide the UE with several PRBs in the resource pool for PSCCH transmission using SCI format 1-B.

[0047] The configuration enables the UE to use SL PRS resource allocation scheme 2 [6, TS 38.214] to transmit PSCCH using SCI format 1-B.

[0048] ***************************Quotation[1]End*******************************

[0049] In TS 38.214 ([2] 3GPP TS 38.214V18.0.0(2023-09) 3GPP; TSG RAN; NR; Physical Layer Procedures for Data (Version 18)), the SL-related procedures for data are specified.

[0050] ***************************Quotation[2]Begins*******************************

[0051] 8. Physical side link shared channel related procedures

[0052] The UE can be configured by a higher layer to have one or more sidelink resource pools. The sidelink resource pools can be used for the transmission of PSSCH as described in Section 8.1 and / or the transmission of SL PRS as described in Section 8.2.4, or for the reception of PSSCH as described in Section 8.3 and / or the transmission of SL PRS as described in Section 8.4.4, and can be associated with sidelink resource allocation mode 1 or sidelink resource allocation mode 2.

[0053] The sidelink resource pool that can be used for both SL PRS and PSSCH transmissions will be referred to as the shared resource pool.

[0054] Sidelink resource pools that can be used for SL PRS transmission but not for PSSCH transmission will be referred to as dedicated SLPRS resource pools.

[0055] …the set of time slots that can belong to the sidelink resource pool is composed of It means that among them

[0056] - 0≤i <T max ,

[0057] - The slot index is associated with slot#0 of the radio frame corresponding to SFN 0 or DFN 0 of the serving cell.

[0058] - The set contains all time slots except for the following time slots.

[0059] -N S-SSB Each time slot is configured with an S-SS / PSBCH block (S-SSB) or additional transmission opportunities for the S-SSB.

[0060] -N nonSL In each of the time slots, at least one of the Y-th, (Y+1), ..., (Y+X-1) OFDM symbols is not semi-statically configured as UL 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 of the received PSBCH (if provided), wherein Y and X are set by the higher-layer parameters sl-StartSymbo and sl-LengthSymbols, respectively.

[0061] - Reserved time slots, which are determined through the following steps.

[0062] 1) Exclude N from all time slot sets S-SSB Time slot and N nonSL The remaining time slots are arranged in ascending order of their time slot indices. express.

[0063] 2) If Here, m = 0, 1, ..., N reserved -1 and N reserved =(10240×2) μ -N S-SSB -N nonSL )mod L bitmap L bitmap Indicating the length of the bitmap configured by the higher layer, then time slot l r (0≤r<10240×2 μ -N S-SSB -N nonSL This belongs to the reserved time slot.

[0064] - The time slots in the set are arranged in ascending order of their time slot indices.

[0065] The UE determines the set of logical time slots assigned to the sidelink resource pool as follows:

[0066] - Use the bitmap associated with the resource pool The length L of the bitmap bitmap Configured by a higher level.

[0067] -If b k′ =1, where k′ = k mod L bitmap Then time slot It belongs to the set.

[0068] - The time slots in the set are reindexed, so that the remaining time slots The subscript i is consecutive {0,1,…,T′} max -1}, where T′ max It is the number of remaining time slots in the set.

[0069] The UE determines the set of resource blocks assigned to the sidelink resource pool as follows:

[0070] - The resource block pool consists of N PRB It consists of 1 PRB.

[0071] -…

[0072] 8.1 UE Procedure for Transmitting Physical Side Link Shared Channel

[0073] Each PSSCH transmission is associated with a PSCCH transmission.

[0074] The PSCCH transmission carries the first-level SCI associated with the PSSCH transmission; the second-level associated SCI is carried within the resources of the PSSCH.

[0075] If the UE transmits SCI format 1-A on the PSCCH according to the PSCCH resource configuration in time slot n and PSCCH resource m, then for associated PSCCH transmissions in the same time slot

[0076] -A transport block can be transmitted using a maximum of two layers;

[0077] The number of layers (υ) is determined based on the 'Number of DMRS Ports' field in SCI;

[0078] - The set of consecutive symbols within a time slot used to transmit PSSCH is determined according to Section 8.1.2.1;

[0079] - The set of adjacent or interleaved resource blocks used to transmit PSSCH is determined according to Section 8.1.2.2;

[0080] …

[0081] 8.1.1 Transmission Scheme

[0082] Only one transmission scheme is defined for PSSCH, and this transmission scheme is used for all PSSCH transmissions.

[0083] …

[0084] 8.1.2.1 Resource Allocation in the Time Domain

[0085] The UE will transmit the PSSCH in the same time slot as the associated PSCCH.

[0086] The smallest unit of resource allocation in the time domain is the time slot.

[0087] The UE will transmit PSSCH in consecutive symbols within a time slot, subject to the following limitations:

[0088] - The UE will not transmit PSSCH in symbols that are not configured for sidelinks. …

[0089] - If PSFCH is configured in this time slot, the UE will not transmit PSSCH in the symbols configured for PSFCH use.

[0090] - The UE will not transmit the PSSCH in the last symbol configured for side link.

[0091] - If PSFCH is configured in this time slot, the UE will not transmit PSSCH in the symbol immediately preceding the symbol configured for PSFCH use.

[0092] -…

[0093] 8.1.2.2 Resource Allocation in the Frequency Domain

[0094] The unit of resource allocation in the frequency domain is the subchannel.

[0095] Subchannel assignments for sidelink transmissions are determined using the “Frequency Resource Assignment” field in the associated SCI.

[0096] The lowest subchannel used for sidelink transmission is the subchannel on which the lowest PRB associated with the PSCCH is transmitted.

[0097] If a PSSCH scheduled by a PSCCH overlaps with a resource containing a PSCCH, then the resource corresponding to the union of the scheduled PSCCH and the associated PSCCH DM-RS is not available for PSSCH.

[0098] …

[0099] 8.1.4 UE procedure for determining the subset of resources to be reported to higher layers during PSSCH resource selection in sidelink resource allocation mode 2.

[0100] In resource allocation mode 2, the higher layer can request the UE to determine the subset of resources from which the higher layer will transmit PSSCH / PSCCH. To trigger this procedure, in slot n, the higher layer provides the following parameters for this PSSCH / PSCCH transmission:

[0101] - A resource pool from which resources will be reported;

[0102] -L1 priority prio TX ;

[0103] - Remaining package delay budget;

[0104] -…

[0105] - The number L of sub-channels to be used for PSSCH / PSCCH transmission in the time slot subCH ;

[0106] -Optional, resource reservation interval P rsvp_TX , in milliseconds.

[0107] - If, as part of a reassessment or pre-occupancy procedure, the higher layer requests the UE to determine a subset of resources from which the higher layer will select resources for PSSCH / PSCCH transmission, the higher layer provides a set of resources that can undergo reassessment (r0, r1, r2, ...) and a set of resources that can undergo pre-occupancy (r0′, r1′, r2′, ...).

[0108] - Determined by the UE implementation scheme in time slot r i "-T3" refers to a subset of resources requested by a higher layer before or after T3, where r i " is the slot with the smallest slot index among (r0,r1,r2,…) and (r0′,r1′,r2′,…), and T3 equals in Defined in the time slots in Table 8.1.4-2, where μ SL This is the SCS configuration for SL BWP.

[0109] -Optionally, instructions for resource selection mechanisms.

[0110] -…

[0111] The following higher-level parameters affect this program:

[0112] -sl-SelectionWindowList: Internal parameter T 2min Set to the given value prioTX The corresponding value comes from the higher-level parameter sl-SelectionWindowList.

[0113] -sl-Thres-RSR-List: This higher-level parameter is for each combination (p i ,p j Provides the RSRP threshold, where p i It is the value of the priority field in the received SCI format 1-A and p j This is the priority of the UE's transmission of the selected resource; for a given call to this procedure, p j =prio TX .

[0114] -sl-RS-ForSensing selects whether the UE uses PSSCH-RSRP or PSCCH-RSRP measurements, as defined in Section 8.4.2.1.

[0115] -sl-ResourceReservePeriodList

[0116] -sl-SensingWindow: The internal parameter T0 is defined as the number of time slots corresponding to the sl-SensingWindow in milliseconds.

[0117] -sl-TxPercentageList: For a given prio TX The internal parameter X is defined as sl-TxPercentageList(prio) which converts percentages to ratios. TX )

[0118] -…

[0119] According to Section 8.1.7, the resource reservation interval P rsvp_TX (If provided) the conversion from milliseconds to logical time slots, resulting in P r ′ svp_TX .

[0120] When the resource pool is (pre-)configured with sl-AllowedResourceSelectionConfig which includes full sensing and full sensing is configured by a higher layer in the UE, the UE performs full sensing.

[0121] When periodic reservation (sl-MultiReserveResource) for another TB is enabled for a resource pool, the resource pool is (pre)configured with sl-AllowedResourceSelectionConfig containing partial sensing, and the partial sensing is configured by a higher layer, the UE performs periodic partial sensing, unless otherwise specified in the specification.

[0122] When a UE is triggered by a higher layer to report resources for resource selection (reselection) in a mode 2 Tx pool, the resource pool is (pre) configured with sl-AllowedResourceSelectionConfig containing partial sensing, and the partial sensing is configured by a higher layer, the UE performs adjacent partial sensing, unless otherwise specified in the specification.

[0123] Note:

[0124] This represents the set of time slots that belong to the sidelink resource pool and are defined in Section 8.

[0125] For dynamic coexistence of LTE sidelink and NR sidelink on the same channel, This represents the set of subframes that can belong to the LTE sidelink resource pool, as defined in Section 14.1.5 of [19, TS36.213].

[0126] Use the following steps:

[0127] 1)...

[0128] If the higher-layer parameters transmissionStructureForPSCCH and PSSCH are not provided, then the candidate single-slot resource R used for transmission x,y Defined as a time slot L with sub-channels x+j subCH A set of adjacent sub-channels, where j = 0,...,L subCH -1. UE should assume any L subCH The L contained in the set of adjacent sub-channels or the corresponding resource pool RBset L in the set of adjacent RBs subCH Each adjacent subchannel corresponds to a candidate single-slot resource for the UE to perform full sensing within the time interval [n+T1, n+T2]. Within the Y candidate time slot set within the time interval [n+T1, n+T2], these resources correspond to periodic partial sensing, adjacent partial sensing, and periodic transmission (P) for the UE to perform. rsvp_TX≠0) Triggered resource selection (reselection) of a candidate single-slot resource or a candidate multi-slot resource, or in the set of Y' candidate slots within the time interval [n+T1, n+T2] corresponding to the UE performing at least adjacent partial sensing and by aperiodic transmission (P rsvp_TX =0) triggers a candidate single-slot resource for resource selection (reselection), where

[0129] -The choice of T1 depends on The following UE implementation scheme, in which Defined in the time slots in Table 8.1.4-2, where μ SL This is the SCS configuration for the SL BWP;

[0130] -If T 2min If the delay is shorter than the remaining packet delay budget (in the time slot), then T2 depends on the experience T. 2min UE implementations where T2 ≤ Remaining packet delay budget (in time slot); otherwise, T2 is set to the remaining packet delay budget (in time slot).

[0131] -Y is chosen by UE, where Y≥Y min .

[0132] -…

[0133] The total number of remaining candidate single-slot resources or candidate multi-slot resources is determined by M. total express.

[0134] 2) The sensing window is defined by the time slot range n–T0 during full sensing by the UE. Define, where T0 is defined above, and Defined in the time slots in Table 8.1.4-1, where μ SL This is the SCS configuration for the SL BWP. The UE should listen to time slots belonging to the sidelink resource pool within the sensing window, except for time slots where its own transmissions occur. The UE should perform the actions in subsequent steps based on the decoded PSCCH and measured RSRP in these time slots.

[0135] …

[0136] 3) Internal parameter Th(p) i ,p j The value is set to the corresponding RSRP threshold indicated by the i-th field in the sl-Thres-RSRP-List, where i = p i +(p j -1)*8.

[0137] …

[0138] 4) Set S AIt is initialized as a set of all candidate single-slot resources or candidate multi-slot resources.

[0139] 5) If the UE meets all of the following conditions, then the UE will be removed from set S. 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 :

[0140] - In step 2, the UE has not yet detected the time slot.

[0141] - For higher-level parameters, sl-ResourceReservePeriodList allows any periodic value and in time slots. The received SCI format 1-A, where the 'resource reservation period' field is set to the periodic value and indicates that all sub-channels of the resource pool in this time slot will satisfy condition c in step 6.

[0142] …

[0143] 5a) If set S A The remaining candidate single-slot resources R x,y Or R x,y,z The number or candidate multi-slot resources R x,y Or R x,y,z The quantity is less than X·M total Then set S A It is initialized as a set of all candidate single-slot resources, as in step 4.

[0144] 6) If the UE meets all of the following conditions, then the UE will be removed from set S. 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 :

[0145] a) UE in time slot The received SCI format 1-A is provided, and according to Section 16.4 of [6, TS 38.213], the 'Resource Reservation Period' field (if present) and 'Priority' field in the received SCI format 1-A respectively indicate the value P. rsvp_RX and prio RX ;

[0146] b) According to Section 8.4.2.1, the RSRP measurement performed for the received SCI format 1-A is higher than Th(prio RX ,prio TX );

[0147] c) In time slots The received SCI format is assumed to be in the time slot only if the 'resource reservation period' field exists in the received SCI format 1-A. The same SCI format received in the process determines the set of resource blocks and their overlapping time slots according to Section 8.1.5, where for q = 1, 2, ..., Q and j = 0, 1, ..., C resel -1, Here, P r ′ svp_RX For P, converted to logical time slot units according to Section 8.1.7 rsvp_RX If P rsvp_RX <T scal And n′-m≤P r ′ svp_RX ,but Where the UE is configured with full sensing by its higher layer, and the time slot n belongs to the set but Otherwise time slot Belongs to set The first time slot after time slot n; if the UE is partially sensed by its higher layer, if time slot Belongs to set but Otherwise time slot Belonging to set time slot The first time slot thereafter. Otherwise, Q = 1. If the UE is configured with full sensing by its higher layer, then T scal The selection window size T2 is set to be converted to milliseconds. If the UE is configured with partial sensing by its higher layer, then... It will be converted to milliseconds, where the time slot The last time slot in a pool of Y or Y′ candidate time slots. The first slot in the selected / remaining set of Y or Y′ candidate slots.

[0148] …

[0149] 7) If set S A The number of remaining candidate single-slot resources or candidate multi-slot resources is less than X·M total Then Th(p) i ,p j (and ThLTE(p)) i ,p j If set, for each priority value (p) i ,p j The value increased by 3dB, and the program continued in step 4.

[0150] 7a) If the sidelink DRX activity time of the RX UE is provided by a higher layer, and during the sidelink DRX activity time in set S A If no candidate single-slot or multi-slot resources remain in the set S, the UE will select another resource based on its implementation scheme that includes the sidelink DRX activity time within the set S. A At least one candidate single-slot resource.

[0151] The UE will report set S to the higher layer. A .

[0152] If the resource r comes from set (r0, r1, r2, ...) i Not set S A If the member is a member, the UE will report to the higher layer to reassess the resources. i .

[0153] If the resource r comes from set (r0′, r1′, r2′, ...) i If the following conditions are met, the UE will report the reserved resources r to the higher layer. i ′.

[0154] …

[0155] 8.1.5 UE Procedure for Determining Time Slots and Resource Blocks for PSSCH Transmissions Associated with SCI Format 1-A

[0156] The set of time slots and resource blocks used for PSSCH transmission is determined by the resources containing the associated SCI format 1-A and the associated SCI format 1-A fields 'Frequency Resource Assignment' and 'Time Resource Assignment' used for PSCCH transmission, as described below.

[0157] When sl-MaxNumPerReserve is 2, the 'Time Resource Assignment' carries a logical timeslot offset indication for N=1 or 2 actual resources; and when sl-MaxNumPerReserve is 3, it carries a logical timeslot offset indication for N=1, 2, or 3 actual resources. It is presented in the form of a time RIV (TRIV) field, as determined below:

[0158] If N=1

[0159] TRIV=0

[0160] Otherwise, if N=2

[0161] TRIV = t1

[0162] otherwise

[0163] If (t2-t1-1)≤15

[0164] TRIV = 30(t2-t1-1) + t1 + 31

[0165] otherwise

[0166] TRIV = 30(31-t2+t1) + 62-t1

[0167] Otherwise if

[0168] Otherwise if

[0169] The first resource is received in the time slot of SCI format 1-A, and t i This represents 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。

[0170] The starting sub-channel of the first resource is determined according to Section 8.1.2.2. For each of the N resources, the number of consecutively allocated sub-channels is L. subCH ≥1 and the starting subchannel index of the resources indicated by the received SCI format 1-A (excluding resources in the time slot where SCI format 1-A is received) are determined by the "frequency resource allocation" equal to the frequency RIV (FRIV), where:

[0171] If sl-MaxNumPerReserve is 2, then

[0172]

[0173] If sl-MaxNumPerReserve is 3, then

[0174]

[0175] in

[0176] - Indicates the starting subchannel index of the second resource

[0177] - Indicates the starting sub-channel index of the third resource

[0178] - This represents the number of subchannels in the resource pool, or, if the higher-layer parameter `transmissionStructureForPSCCHandPSSCH` is set to 'interlaceRB', the number of subchannels in each RB set provided by the higher-layer parameter `sl-NumSubchannel`.

[0179] …

[0180] 8.2.4SL PRS Transmission Procedure

[0181] The following parameters used for SL PRS transmission are associated with each SL PRS resource:

[0182] -[SL PRS Resource ID] indicates the identifier of an SL PRS resource. An SL PRS resource is identified by a unique SL PRS Resource ID within a time slot of a dedicated SL PRS resource pool. For a shared resource pool, an SL PRS resource is uniquely identified by a combination of the SL PRS Resource ID within the time slot and the SL PRS frequency domain allocation.

[0183] -[SL PRS Comb Offset and Comb Size] indicates the comb offset and comb size of the SL PRS resource.

[0184] -[Number of Start Symbols and SL PRS Symbols] indicates the number of start symbol indices and SL PRS resource symbols within a time slot.

[0185] -[SL PRS Frequency Domain Allocation] indicates the frequency location [and the number of resource blocks in the shared resource pool used for SL PRS transmission].

[0186] Each SL PRS transmission is associated with a PSCCH transmission in the same time slot.

[0187] In the case of a dedicated pool used for SL positioning, the PSCCH carries SCI format 1-B associated with SL PRS transmission.

[0188] The UE can report the association information between the transmitted SL PRS resources and the UE Tx ARP ID.

[0189] 8.2.4.1 Resource Allocation

[0190] In sidelink resource allocation mode 1:

[0191] - For SL PRS transmission, the UE can be configured with dynamic permission, configured permission type 1, or configured permission type 2.

[0192] 8.2.4.1.1 Resource Allocation in the Time Domain

[0193] The UE will transmit SL PRS in the same time slot as the associated PSCCH.

[0194] The UE will transmit SL PRS in consecutive symbols within the time slot.

[0195] The UE does not transmit multiple SL PRS resources in the same time slot.

[0196] For shared resource pools, the UE transmits SL PRS in the PSSCH symbol according to Section 8.1.2.1, [with the following limitations:]

[0197] - The number of adjacency symbols 'M' used for SL PRS transmission should correspond to one of the SL PRS resources in the parameters.

[0198] - The UE should not transmit SL PRS in symbols that are associated with the PSCCH.

[0199] - The UE should not transmit SL PRS and PSSCH DMRS in the same symbol.

[0200] - The UE should transmit SL PRS on adjacent symbols between or after the symbols that transmit PSSCH DMRS.

[0201] - The UE should transmit SL PRS only after the last symbol with the second-level SCI.

[0202] - For a given value 'M', the SL PRS resource is mapped to the last 'M' consecutive SL symbols in the time slot that satisfy all other constraints.

[0203] - The UE should not transmit PSSCH and SL PRS in the same symbol.

[0204] SL-PRS resources and PSFCH (containing the preceding gap symbol) are not mapped to the same symbol.

[0205] For dedicated resource pools, UEs transmit SL PRS under the following restrictions:

[0206] - The UE should not transmit SL PRS and associated PSCCH in the same symbol;

[0207] - The number of adjacency symbols and start symbols used for SL PRS transmission should correspond to one of the SL PRS resources in the parameter [].

[0208] In the sidelink resource allocation mode 1 of the shared resource pool, the time-domain behavior of SL PRS's sidelink dynamic granting and sidelink configured granting follows the behavior in Section 8.1.2.1.

[0209] In sidelink resource allocation mode 1 of the dedicated resource pool, the time-domain behavior of SL PRS's dynamic sidelink granting and configured sidelink granting follows the behavior in Section 8.1.2.1, with the following modifications:

[0210] -[“DCI format 3_0” is replaced by “DCI format 3_2”].

[0211] - "PSSCH" is replaced by "SL PRS".

[0212] 8.2.4.1.2 Resource Allocation in the Frequency Domain

[0213] For shared resource pools, the frequency domain resource assignment of SL PRS resources is the same as that of PSSCH in the same time slot.

[0214] For dedicated resource pools, the frequency domain resource allocation of SL PRS resources is the same as the frequency resources of the resource pool.

[0215] 8.2.4.2 UE procedure for determining the subset of resources to be reported to higher layers in the SL PRS resource selection within the dedicated resource pool during sidelink resource allocation mode 2.

[0216] In resource allocation mode 2, within a dedicated resource pool, the higher layer can request the UE to determine which subset of resources the higher layer will select from the resources for SL PRS[ / PSCCH] transmission. To trigger this procedure, in slot n, the higher layer provides the following parameters for this SL PRS[ / PSCCH] transmission:

[0217] - A resource pool from which resources will be reported;

[0218] -L1 priority prio TX ;

[0219] - Remaining [delayed budget];

[0220] -SL-PRS resource ID set;

[0221] -Optional, resource reservation interval P rsvp_TX , in milliseconds.

[0222] - If, as part of a reassessment or pre-occupancy procedure, the higher layer requests the UE to determine a subset of resources from which the higher layer will select resources for SL PRS[ / PSCCH] transmission, the higher layer provides a set of resources that can undergo reassessment (r0,r1,r2,…) and a set of resources that can undergo pre-occupancy (r0′,r1′,r2′,…).

[0223] - Determined by the UE implementation scheme in time slot r i "-T3" refers to a subset of resources requested by a higher layer before or after T3, where r i " is the slot with the smallest slot index among (r0,r1,r2,…) and (r0′,r1′,r2′,…), and T3 equals in Defined in the time slots in Table 8.1.4-2, where μ SL This is the SCS configuration for SL BWP.

[0224] The following higher-level parameters affect this program:

[0225] -[sl-SelectionWindowList: Internal parameter T] 2min Set to the given value prio TX The corresponding value comes from the higher-level parameter sl-SelectionWindowList.

[0226] -[sl-Thres-RSR-List]: This higher-level parameter is for each combination (p i ,p j Provides the RSRP threshold, where p i It is the value of the priority field in the received SCI format 1-B and p j This is the priority of the UE's transmission of the selected resource; for a given call to this procedure, p j =prio TX .

[0227] -[reservationPeriodAllowed-Dedicated-SL-PRS-RP]

[0228] -[sl-SensingWindow]: The internal parameter T0 is defined as the number of time slots corresponding to the sl-SensingWindow in milliseconds.

[0229] -[sl-TxPercentageLis]: For a given prio TX The internal parameter X is defined as sl-TxPercentageList(prio) which converts percentages to ratios. TX )

[0230] -[sl-PreemptionEnable]: If sl-PreemptionEnable is provided, and if it is not equal to 'enabled', then the internal parameter prio... pre It is set to the parameter sl-PreemptionEnable provided by the higher layer.

[0231] The UE should execute this procedure according to Section 8.1.4, with the following modifications:

[0232] - Some sensing is not applicable to the dedicated SL PRS resource pool;

[0233] - Candidate single-slot resource R used for transmission x,y The SL PRS resource defined as index x in the set of SL-PRS resource IDs provided by a higher layer, and located in the time slot. middle

[0234] - "SCI format 1-A" is replaced by "SCI format 1-B".

[0235] - In step 5[].

[0236] - In condition b of step 6, the RSRP measurement is the PSCCH-RSRP on the DM-RS resource element of the PSSCH.

[0237] - In condition c of step 6, "Determine the set of resource blocks and time slots according to Section 8.1.5" is replaced by "Determine the set of time slots and SL PRS resources according to Section 8.2.4.X".

[0238] 8.2.4.2 UE procedure for determining the time slots and SL PRS resources associated with SCI format 1-B in the dedicated resource pool

[0239] The set of time slots and SL PRS resources for SL PRS transmission is determined by the PSCCH containing the associated SCI format 1-B and the fields '[SL-PRS resource ID]', '[Time resource assignment]' of the associated SCI format 1-B, as described below.

[0240] Determine the set of time slots as in Section 8.1.5, with the following modifications:

[0241] - "SCI format 1-A" is replaced by "SCI format 1-B".

[0242] -[Potential parameter name change].

[0243] The first SL PRS resource is determined according to the subchannel containing the associated SCI format 1-B for PSCCH transmission: the index of the subchannel in the resource pool is the same as the index of the SL PRS resource provided by [higher layer parameter].

[0244] If [sl-MaxNumPerReserve] is 2, the index of the second SL PRS resource is indicated by the field [Resource ID indication].

[0245] [If [sl-MaxNumPerReserve] is 3, the index of the second / third SL PRS resource is indicated by the field [Resource ID indication].]

[0246] If the TRIV determined according to Section 8.1.5 indicates N < sl-MaxNumPerReserve, the SL PRS resource index corresponding to the last sl-MaxNumPerReserve minus N resources is not used.

[0247] The number of time slots in a time and frequency resource set for a transmission opportunity of SL PRS is determined by C. resel Given, where C resel = 10 * SL_RESOURCE_RESELECTION_COUNTER[10, TS 38.321] (if configured), otherwise C resel It is set to 1.

[0248] If time slot The SL PRS resources in the table are determined as the time and frequency resources used for SL PRS transmissions corresponding to the selected side link permission (described in [10, TS38.321]), then the time slots... The same SL PRS resource in the same context is also determined for SL PRS transmissions corresponding to the same side link, where j = 1, 2, ..., C resel -1, according to Section 8.1.7, P rsvp_TX (If provided) the conversion from milliseconds to logical time slots, resulting in P r ′ svp_TX ,and This is determined by Section 8. Here, P rsvp_TX It is a resource reservation interval indicated by a higher level.

[0249] …

[0250] 8.3 UE Procedure for Receiving Physical Side Link Shared Channel

[0251] For sidelink resource allocation mode 1, after detecting SCI format 1-A on the PSCCH, the UE can decode the PSSCH according to the detected SCI formats 2-A, 2-B, and 2-C and the associated PSSCH resource configuration configured by the higher layer. The UE does not need to decode more than one PSCCH at each PSCCH resource candidate.

[0252] For sidelink resource allocation mode 2, after detecting SCI format 1-A on the PSCCH, the UE can decode the PSCCH according to the detected SCI formats 2-A, 2-B, and 2-C and the associated PSCCH resource configuration configured by the higher layer. The UE does not need to decode more than one PSCCH at each PSCCH resource candidate.

[0253] If SCI format 1-A indicates an MCS table that the UE does not support, then the UE needs to neither decode the corresponding SCI formats 2-A, 2-B, and 2-C nor decode the PSSCH associated with SCI format 1-A.

[0254] 8.4 UE Procedure for Receiving Reference Signals

[0255] …

[0256] 8.4.4SL PRS Receiver Procedure

[0257] The UE can be configured via [higher layer parameters] to measure and report one or more of the following measurements: SL RSTD, SL Rx-Tx time difference, SL RTOA, SL AoA, SL PRS-RSRP, and SL PRS-RSRPP for the first detected path and / or additional detected paths. The UE can report the ARP ID associated with the reported measurement. The UE can provide ARP location information for the ARP ID via [higher layer parameters].

[0258] The UE uses the same ARP to transmit and receive the sidelink positioning reference signal, while performing SL Rx-Tx time difference measurement.

[0259] When a UE reports one or more of the following measurements: SL RSTD, SL Rx-Tx time difference, SL RTOA, SL AoA, SL PRS-RSRP, and SL PRS-RSRPP, the UE may include an SL PRS resource ID.

[0260] For SL RSTD, SL Rx-Tx time difference, SL RTOA, SL AoA, SL PRS-RSRP, and SL PRS-RSRPP measurements, the UE reports the associated SL PRS reception timestamp via the higher-layer parameter [sl-prs-time-stamp]. For SL Rx-Tx time difference, the UE may report the associated SL PRS transmission timestamp via the higher-layer parameter [sl-prs-time-stamp]. The timestamp includes the SFN, the slot number, and optionally nr-PhysCellID, nr-ARFCN, nr-CellGlobalID, or the timestamp includes the DFN and the slot number.

[0261] The UE can report the LoS / NLoS indicator via the [nr-los-nlos-Indicator] associated with each SL RSTD, SL Rx-Tx time difference, SL RTOA, SL AoA, SL PRS-RSRP, and SLPRS-RSRPP measurement.

[0262] The UE can report synchronization information with associated quality metrics, such as synchronization source type and / or relative time difference, via [higher layer parameters]. For SL RSTD measurements, the UE can report reference UE information.

[0263] For SL RTOA measurements, the SFN or DFN initialization time can be provided to the UE by the UE or the network.

[0264] Location information of other UEs can be provided to the UE via [higher-layer parameters]. The UE can report its location information to the network.

[0265] The expected SL AoA and the range of uncertainty of the expected SL AoA can be provided to the UE via [higher layer parameters].

[0266] The UE can report quality metrics [time quality] corresponding to SL RSTD, SL RTOA, or SL Rx-Tx time difference measurements. The UE can report quality metrics [angle quality] corresponding to SL AoA measurements. [If the '[SL PRS Request]' field in the SCI associated with the received SL PRS is set to 1, the UE should report this request for SL PRS transmission to a higher layer.]

[0267] ***************************Quotation[2]End*******************************

[0268] In TS 38.214 ([3] 3GPP TS 38.214V17.6.0(2023-09) 3GPP; TSG RAN; NR; Physical Layer Procedures for Data (Version 17)), the SL-related procedures in the MAC layer are specified.

[0269] ***************************Quotation[3]Begins*******************************

[0270] 5.22 SL-SCH Data Transmission

[0271] 5.22.1 SL-SCH Data Transmission

[0272] 5.22.1.1 SL grants permission to receive and transmit SCI.

[0273] Sidelink grants are received dynamically on the PDCCH, either semi-statically configured by the RRC or autonomously selected by the MAC entity. The MAC entity determines the set of PSSCH durations for transmissions of SCI occurring on the active SL BWP, and the set of PSSCH durations for transmissions of SL-SCH associated with the SCI occurring on the sidelink grant. Sidelink grants addressed to SL-CS-RNTI with NDI=1 are considered dynamic sidelink grants.

[0274] …

[0275] If the MAC entity has been configured with sidelink resource allocation mode 2 to use a resource pool in the carrier for transmission, as indicated in TS 38.331[5] or TS 36.331

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

[0276] Note 1: If the MAC entity is configured with sidelink resource allocation mode 2 to use a resource pool in the carrier for transmission, as indicated in TS 38.331[5] or TS 36.331

[21] , the MAC entity may create a selected sidelink grant on the resource pool only after releasing the configured sidelink grant (if any) based on random selection, partial sensing or full sensing.

[0277] …1> If the MAC entity has selected sidelink permission to create a transmission corresponding to multiple MAC PDUs, and SL data is available in the logical channel:

[0278] 2> If the MAC entity has not yet selected a resource pool that can be used for the logical channel:

[0279] …

[0280] 2> Perform a TX resource selection (reselection) check on the selected resource pool, as specified in Section 5.22.1.2;

[0281] Note 3: The MAC entity continuously performs TX resource selection (reselection) checks until the corresponding resource pool is released by RRC, or the MAC entity decides to cancel the selected side link permission for creating a transmission corresponding to multiple MAC PDUs.

[0282] …

[0283] Note 3A: The MAC entity selects a resource reservation interval value that is greater than the remaining PDB of available SL data in the logical channel.

[0284] 3> Reserve resources with equal probability for intervals greater than or equal to 100ms in interval [5,15] or for intervals less than 100ms in interval [5,15]. Randomly select an integer value and set SL_RESOURCE_RESELECTION_COUNTER to the selected value;

[0285] 3> In the absence of sl-TxPoolExceptional: If CBR measurement results are available, select the number of HARQ retransmissions from the allowed number of retransmissions, which is configured by RRC in sl-MaxTxTransNumPSSCH included in sl-PSSCH-TxConfigList and overlapped by RRC in sl-MaxTxTransNumPSSCH indicated in sl-CBR-PriorityTxConfigList, where sl-CBR-PriorityTxConfigList is for the highest priority of the logical channels allowed on the carrier and determined by the lower layer according to TS. The CBR measured in Section 5.1.27 of 38.215

[24] ; or if the CBR measurement result is unavailable, select the corresponding sl-defaultTxConfigIndex configured by RRC; or if partial sensing is selected and the CBR measurement result is unavailable, select the corresponding sl-DefaultCBR-PartialSensing configured by RRC; or if random selection is selected and the CBR measurement result is unavailable, select the corresponding sl-DefaultCBR-RandomSelection configured by RRC;

[0286] 3> Without using sl-TxPoolExceptional: If CBR measurement results are available, select the amount of frequency resources that overlap between sl-MinSubChannelNumPSSCH and sl-MaxSubchannelNumPSSCH as configured by RRC in sl-PSSCH-TxConfigList and between sl-MinSubChannelNumPSSCH and sl-MaxSubchannelNumPSSCH as indicated by RRC in sl-CBR-PriorityTxConfigList, where sl-CBR-PriorityTxConfigList represents the highest priority of the logical channels allowed on the carrier and is determined by the lower layer based on TS. The CBR measured in Section 5.1.27 of 38.215

[24] ; or if the CBR measurement result is unavailable, select the corresponding sl-defaultTxConfigIndex configured by RRC; or if partial sensing is selected and the CBR measurement result is unavailable, select the corresponding sl-DefaultCBR-PartialSensing configured by RRC; or if random selection is selected and the CBR measurement result is unavailable, select the corresponding sl-DefaultCBR-RandomSelection configured by RRC;

[0287] 3> If the sl-InterUE-CoordinationScheme1 for receiving / transmitting with preferred and non-preferred resource sets is not configured by RRC:

[0288] 4> If the random selection of the transmission is configured by the upper layer:

[0289] 5> Based on the amount of selected frequency resources and the remaining PDB of SL data available in the allowed logical channels on the carrier, randomly select time and frequency resources from the resource pool that occur during the SL DRX activity time (if configured) of the destination UE as specified in Section 5.28.2, for a transmission opportunity, the destination UE being selected to indicate the aforementioned SL DRX activity time to the physical layer.

[0290] 4> Otherwise:

[0291] 5> Based on the amount of selected frequency resources and the remaining PDB of SL data available in the allowed logical channels on the carrier, randomly select time and frequency resources for a transmission opportunity from the resources specified in Section 8.1.4 of TS 38.214[7] that occur during the SL DRX activity time (if configured) of the destination UE as specified in Section 5.28.2, which the destination UE is selected to indicate the aforementioned SL DRX activity time to the physical layer.

[0292] …

[0293] 3> Use randomly selected resources to select a periodic set of resources separated by resource reservation intervals for the transmission of PSCCH and PSSCH corresponding to the number of transmission opportunities of the MAC PDU as determined in TS 38.214[7].

[0294] 3> If you choose one or more HARQ retransmissions:

[0295] 4> If the sl-InterUE-CoordinationScheme1 for receiving / transmitting with preferred and non-preferred resource sets is not configured by RRC:

[0296] 5> If the transmission based on full sensing or partial sensing is configured by the upper layer and, in accordance with Section 8.1.4 of TS 38.214[7], available resources are reserved in the resources indicated by the physical layer for further transmission opportunities; or

[0297] 5> If the random selection of a transport is configured by the upper layer and available resources are reserved in the resource pool for more transport opportunities:

[0298] 6> 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 according to Section 8.3.1.1 of TS 38.212[9], by ensuring the minimum time gap between any two selected resources, the time and frequency resources for one or more transmission opportunities are randomly selected from the available resources that occur during the SL DRX activity time (if configured) of the destination UE as specified in Section 5.28.2, based on the amount of selected frequency resources, the selected number of HARQ retransmissions and the remaining PDB of SL data available in the allowed logical channels on the carrier, the destination UE is selected to indicate the above-mentioned SL DRX activity time to the physical layer.

[0299] …

[0300] 4> Use randomly selected resources to select a periodic set of resources separated by resource reservation intervals for the transmission of PSCCH and PSSCH corresponding to the number of retransmission opportunities of the MAC PDU as determined in TS 38.214[7].

[0301] 4> Treat the first set of transmission opportunities as the initial transmission opportunities, and the other set of transmission opportunities as retransmission opportunities;

[0302] 4> The set of initial transmission opportunities and retransmission opportunities is considered as the selected side link grant.

[0303] 3> Otherwise:

[0304] 4> The set is considered as a selected side link grant.

[0305] 3> According to TS 38.214[7], the set of PSCCH durations and the set of PSSCH durations are determined using selected sidelink permissions.

[0306] 2> Otherwise, if SL_RESOURCE_RESELECTION_COUNTER = 0, and when SL_RESOURCE_RESELECTION_COUNTER is equal to 1, MAC entities are randomly selected with equal probability, the probability being a value in the interval [0,1] that is less than or equal to the probability configured by RRC in sl-ProbResourceKeep;

[0307] 3> Clear the selected sidelink permission if available;

[0308] 3> Reserve resources with equal probability for intervals greater than or equal to 100 ms in interval [5,15] or for intervals less than 100 ms in interval [5,15]. Randomly select an integer value and set SL_RESOURCE_RESELECTION_COUNTER to the selected value;

[0309] 3> Reuse the previously selected sidelink to allow the transmission of the number of MAC PDUs determined in TS 38.214[7] with the resource reservation interval to determine the set of PSCCH durations and the set of PSSCH durations according to TS 38.214[7].

[0310] 1> If the MAC entity has been selected as the chosen sidelink grant for creating a transmission corresponding to a single MAC PDU, and if SL data is available in the logical channel, or an SL-CSI report is triggered, or a sidelink DRX command indication is triggered, or a sidelink UE-to-UE coordination information report is triggered, or a sidelink UE-to-UE coordination request is triggered:

[0311] 2> If SL data can be used for NR-side link discovery in the logical channel:

[0312] …

[0313] 2> Otherwise, if the SL data used for NR sidelink communication is available in the logical channel:

[0314] 3> If sl-HARQ-FeedbackEnabled is set to enabled for the logical channel:

[0315] 4> Select any resource pool that has PSFCH resources configured, except for the pools in sl-BWP-DiscPoolConfig or sl-BWP-DiscPoolConfigCommon (if configured).

[0316] 3> Otherwise:

[0317] 4> Select any resource pool other than the pools in sl-BWP-DiscPoolConfig or sl-BWP-DiscPoolConfigCommon (if configured).

[0318] 2> Otherwise, if an SL-CSI report, sidelink DRX command, sidelink UE-to-UE coordination request, or sidelink UE-to-UE coordination information is triggered:

[0319] 3> Select any resource pool other than the pools in sl-BWP-DiscPoolConfig or sl-BWP-DiscPoolConfigCommon (if configured).

[0320] 2> Perform a TX resource selection (reselection) check on the selected resource pool, as specified in Section 5.22.1.2;

[0321] 2> If TX resource selection (reselection) is triggered due to TX resource selection (reselection) check;

[0322] 3> If one or more SL DRXs are configured in the destination UE receiving SL-SCH data:

[0323] 4> Indicate to the physical layer the SL DRX activity time in the destination UE receiving SL-SCH data, as specified in Section 5.28.2.

[0324] 3> In the absence of sl-TxPoolExceptional: If CBR measurement results are available, select the number of HARQ retransmissions from the allowed number of retransmissions, which is configured by RRC in sl-MaxTxTransNumPSSCH included in sl-PSSCH-TxConfigList and overlapped by RRC in sl-MaxTxTransNumPSSCH indicated in sl-CBR-PriorityTxConfigList, where sl-CBR-PriorityTxConfigList is for the highest priority of the logical channels allowed on the carrier and determined by the lower layer according to TS. The CBR measured in Section 5.1.27 of 38.215

[24] ; or if the CBR measurement result is unavailable, select the corresponding sl-defaultTxConfigIndex configured by RRC; or if partial sensing is selected and the CBR measurement result is unavailable, select the corresponding sl-DefaultCBR-PartialSensing configured by RRC; or if random selection is selected and the CBR measurement result is unavailable, select the corresponding sl-DefaultCBR-RandomSelection configured by RRC;

[0325] 3> In the absence of sl-TxPoolExceptional: If CBR measurement results are available, select the amount of frequency resources that overlap between sl-MinSubChannelNumPSSCH and sl-MaxSubChannelNumPSSCH as configured by RRC in sl-PSSCH-TxConfigList, and between sl-MinSubChannelNumPSSCH and sl-MaxSubChannelNumPSSCH as indicated in sl-CBR-PriorityTxConfigList as configured by RRC, where sl-CBR-PriorityTxConfigList is for the highest priority of the logical channels allowed on the carrier and determined by the lower layer based on TS. The CBR measured in Section 5.1.27 of 38.215

[24] ; or if the CBR measurement result is unavailable, select the corresponding sl-defaultTxConfigIndex configured by RRC; or if partial sensing is selected and the CBR measurement result is unavailable, select the corresponding sl-DefaultCBR-PartialSensing configured by RRC; or if random selection is selected and the CBR measurement result is unavailable, select the corresponding sl-DefaultCBR-RandomSelection configured by RRC;

[0326] 3> If the sl-InterUE-CoordinationScheme1 for receiving / transmitting with preferred and non-preferred resource sets is not configured by RRC:

[0327] 4> If the random selection of the transmission is configured by the upper layer:

[0328] 5> Based on the amount of selected frequency resources, the remaining PDB of SL data available in the allowed logical channels on the carrier, and the delay requirement of the triggered SL CSI report, randomly select time and frequency resources from the resource pool that occur within the SL DRX activity time (if configured) of the destination UE as specified in Section 5.28.2, for a transmission opportunity, the destination UE being selected to indicate the aforementioned SL DRX activity time to the physical layer.

[0329] 4> Otherwise:

[0330] 5> Based on the amount of selected frequency resources and the remaining PDB of SL data available in the allowed logical channels on the carrier and / or the delay requirement of the triggered SL-CSI report, randomly select time and frequency resources for a transmission opportunity from the resources specified in Section 8.1.4 of TS 38.214[7] that occur during the SL DRX activity time (if configured) of the destination UE as specified in Section 5.28.2, which the destination UE is selected to indicate the aforementioned SL DRX activity time to the physical layer.

[0331] …

[0332] 3> If you choose one or more HARQ retransmissions:

[0333] 4> If the sl-InterUE-CoordinationScheme1 for receiving / transmitting with preferred and non-preferred resource sets is not configured by RRC:

[0334] 5> If the transmission based on full sensing or partial sensing is configured by the upper layer and, in accordance with Section 8.1.4 of TS 38.214[7], available resources are reserved in the resources indicated by the physical layer for further transmission opportunities; or

[0335] 5> If the random selection of a transport is configured by the upper layer and available resources are reserved in the resource pool for more transport opportunities:

[0336] 6> 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 according to Section 8.3.1.1 of TS 38.212[9], by ensuring the minimum time gap between any two selected resources, the time and frequency resources for one or more transmission opportunities are randomly selected from the available resources occurring during the SLDRX activity time (if configured) of the destination UE as specified in Section 5.28.2, 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 channel allowed on the carrier and / or the delay requirement of the triggered SL-CSI, according to the amount of selected frequency resources, the selected number of HARQ retransmissions and the remaining PDB of SL data available in the logical channel allowed on the carrier and / or the delay requirement of the triggered SL-CSI.

[0337] …

[0338] 4> The first teleportation opportunity that occurs in time will be considered the initial teleportation opportunity, and other teleportation opportunities will be considered retransmission opportunities;

[0339] 4> Treat all transmission opportunities as granted on the selected side link.

[0340] 3> Otherwise:

[0341] 4> The set is considered as a selected side link grant.

[0342] 3> According to TS 38.214[7], the selected side link permission is used to determine the PSCCH duration and PSSCH duration.

[0343] …

[0344] Note 3B1: If it is not possible to select retransmission resources by ensuring that resources can be selected by the time resource assignment instruction of the previous SCI, then how to select time and frequency resources for one or more transmission opportunities from available resources by ensuring the minimum time gap between any two selected resources when the PSFCH is configured for this resource pool depends on the UE implementation scheme.

[0345] …

[0346] 1> If the selected sidelink is permitted to retransmit MAC PDUs that have been confirmed, as specified in Section 5.22.1.3.3:

[0347] 2> Allow clearing of the PSCCH duration and PSSCH duration corresponding to the retransmission of the MAC PDU from the selected side link.

[0348] Note 3C: How the MAC entity determines the remaining PDB of the SL data depends on the UE implementation scheme.

[0349] For selected sidelink grants, the minimum time interval between any two selected resources includes:

[0350] - The time gap between the end of the last symbol transmitted in the PSSCH of the first resource and the start of the first symbol received in the corresponding PSFCH, as determined by sl-MinTimeGapPSFCH and sl-PSFCH-Period for the resource pool; and

[0351] -PSFCH reception and processing, plus the time required for sidelink retransmission preparation including the necessary physical channel multiplexing, and any TX-RX / RX-TX switching time.

[0352] Note 4: How to determine the time required for PSFCH reception and processing plus sidelink retransmission preparation depends on the UE implementation scheme.

[0353] For each PSSCH duration, the MAC entity will:

[0354] 1> For each sidelink occurring during this PSSCH duration, the following is permitted:

[0355] 2> Select the allowed MCS table in the resource pool associated with the sidelink grant;

[0356] Note 4a: If more than one MCS table is configured, the selection of the MCS table depends on the UE implementation scheme.

[0357] 2> If the MAC entity is already configured with sidelink resource allocation mode 1:

[0358] 3> Select an MCS, which, if configured, is within the range of sl-MinMCS-PSSCH and sl-MaxMCS-PSSCH configured by RRC and associated with the selected MCS table contained in sl-ConfigDedicatedNR;

[0359] 3> Set the resource reservation interval to 0ms.

[0360] 2> Otherwise:

[0361] 3> Without using sl-TxPoolExceptional: If CBR measurement results are available, the MCS is selected, which, if configured, is within the overlapping range of sl-MinMCS-PSSCH and sl-MaxMCS-PSSCH associated with the selected MCS table included in the selected MCS table contained in the sl-PSSCH-TxConfigList, configured by the RRC, and sl-MinMCS-PSSCH and sl-MaxMCS-PSSCH associated with the selected MCS table indicated in the sl-CBR-PriorityTxConfigList, where the sl-CBR-PriorityTxConfigList is configured for the highest priority of the sidelink logical channel in the MAC PDU and is determined by the lower layer based on TS. The CBR measured in Section 5.1.27 of 38.215

[24] ; or if the CBR measurement result is unavailable, select the corresponding sl-defaultTxConfigIndex configured by RRC; or if partial sensing is selected and the CBR measurement result is unavailable, select the corresponding sl-DefaultCBR-PartialSensing configured by RRC; or if random selection is selected and the CBR measurement result is unavailable, select the corresponding sl-DefaultCBR-RandomSelection configured by RRC;

[0362] 3> If the MAC entity decides not to use the selected sidelink, it is granted the next PSSCH duration corresponding to the initial transmission opportunity:

[0363] 4> Set the resource reservation interval to 0ms.

[0364] 3> Otherwise:

[0365] 4> Set the resource reservation interval to the selected value.

[0366] Note 5: If the MCS or the corresponding range is not configured by RRC, the MCS selection depends on the UE implementation scheme.

[0367] 2> If the configured sidelink has been activated and this PSSCH duration corresponds to the first PSSCH transmission opportunity within this sl-PeriodCG that has been configured sidelinked:

[0368] 3> Set the HARQ process ID to the HARQ process ID associated with this PSSCH duration and for all subsequent PSSCH durations (if available) that are permitted to occur in this sl-PeriodCG by the configured sidelink;

[0369] 3> Determine the duration of this PSSCH for the initial transfer;

[0370] 3> Clear the HARQ buffer of the sidelink process associated with the HARQ process ID.

[0371] 2> For this PSSCH duration, the sidelink grant, selected MCS, and associated HARQ information are delivered to the sidelink HARQ entity.

[0372] …

[0373] 5.22.1.2 TX Resource Selection (Reselection) Check

[0374] If the TX resource selection (reselection) check procedure is triggered on the selected resource pool used for the sidelink process in accordance with Section 5.22.1.1, the MAC entity will target the sidelink process as follows:

[0375] 1> If the duration of the PSCCH for all transmissions of the MAC PDU granted for any selected sidelink and the Level 2 SCI on the PSSCH are not within the SL DRX active time at the destination as specified in Section 5.28.3, where data is to be transmitted; or

[0376] 1> If SL_RESOURCE_RESELECTION_COUNTER = 0 and when SL_RESOURCE_RESELECTION_COUNTER equals 1, MAC entities are randomly selected with equal probability, the probability being a value in the interval [0,1] higher than the probability configured by RRC in sl-ProbResourceKeep; or

[0377] 1> If the resource pool is configured or reconfigured by RRC; or

[0378] 1> If the selected sidelink is not available in the selected resource pool; or

[0379] 1> If the MAC entity neither transmits nor retransmits any resource indicated in the selected side link grant during the last second; or

[0380] 1> If sl-ReselectAfter is configured and the number of consecutive unused transmission opportunities on the resources indicated in the selected sidelink grant is equal to sl-ReselectAfter, the number is incremented by 1 when the resources granted by the selected sidelink within the resource reservation interval are not used; or

[0381] 1> If the selected sidelink permission cannot accommodate the RLC SDU by using the maximum allowed MCS configured by RRC in the sl-MaxMCS-PSSCH associated with the selected MCS table, and the UE chooses not to segment the RLC SDU; or

[0382] Note 1: If the selected sidelink permission cannot adapt to the RLC SDU, whether to perform segmentation or sidelink resource reselection depends on the UE implementation scheme.

[0383] 1> If the transmission granted by the selected sidelink cannot satisfy the remaining PDB of data in the logical channel, and the MAC entity chooses not to perform the transmission corresponding to a single MAC PDU:

[0384] Note 2: If the remaining PDB is not satisfied, whether to perform a transmission or sidelink resource reselection corresponding to a single MAC PDU depends on the UE implementation scheme.

[0385] Note 3: Whether TX resource selection (reselection) is triggered due to the delay requirement of MAC CE triggered according to Section 5.22.1.7 depends on the UE implementation scheme.

[0386] 2> Clear the selected sidelink permissions associated with the sidelink process (if available);

[0387] 2> Trigger TX resource selection (reselection).

[0388] Note 4: Empty.

[0389] Note 5: Empty.

[0390] …

[0391] …

[0392] 5.22.1.4 Multiplexing and Assembly

[0393] 5.22.1.4.0 Overview

[0394] For a PDU associated with an SCI, the MAC will consider only the logical channel with the same source 2ID-destination 2ID pair among unicast, multicast, and broadcast. This allows multiple transmissions for different sidelink processes to be executed independently during different PSSCH durations.

[0395] Note: Sidelink data transmitted by the UE for discovery and sidelink data for non-discovery cannot be multiplexed into the same TB because they are always associated with different destination L2 IDs (see TS23.304

[26] ).

[0396] 5.22.1.4.1 Logical Channel Priority Ordering

[0397] 5.22.1.4.1.1 Overview

[0398] Whenever a new transmission is executed, the application sidelink logical channel priority sorting procedure is applied.

[0399] The scheduling of RRC control-side link data is achieved through transmission on each logical channel:

[0400] -sl-Priority, where the increased priority value indicates a lower priority;

[0401] -sl-PrioritizedBitRate sets the sidelink Prioritized Bit Rate (sPBR).

[0402] -sl-BucketSizeDuration sets the sidelink bucket size duration (sBSD).

[0403] RRC also controls the LCP procedure by configuring mapping limits for each logical channel:

[0404] -sl-configuredGrantType1Allowed sets whether configured permission type 1 can be used for sidelink transmission;

[0405] -sl-AllowedCG-List, which sets the allowed configured permissions for sidelink transmissions;

[0406] -sl-HARQ-FeedbackEnabled sets whether logical channels are allowed to be multiplexed with logical channels when sl-HARQ-FeedbackEnabled is enabled or disabled.

[0407] The following UE variables are used in the logical channel priority sorting procedure:

[0408] -SBj, which is maintained for each logical channel j.

[0409] When establishing a logical channel, the MAC entity should initialize the logical channel's SBj to zero.

[0410] For each logical channel j, the MAC entity should:

[0411] 1> Before each instance of the LCP program, increment the product sPBR×T of SBj, where T is the time elapsed since the last increment of SBj;

[0412] 1> If the value of SBj is greater than the side link storage size (i.e., sPBR × sBSD):

[0413] 2> Set SBj to the side link storage size.

[0414] Note that the exact timing of the UE updating SBj during the LCP procedure depends on the UE implementation scheme, as long as SBj is up-to-date when it is approved by the LCP.

[0415] 5.22.1.4.1.2 Selection of Logical Channel

[0416] For each SCI corresponding to a new transfer, the MAC entity should:

[0417] 1> If sl-BWP-DiscPoolConfig or sl-BWP-DiscPoolConfigCommon is configured according to TS 38.331[5]:

[0418] 2> If the new transport is associated with a sidelink grant configured in sl-DiscTxPoolSelected or sl-DiscTxPoolScheduling in sl-BWP-DiscPoolConfig or sl-BWP-DiscPoolConfigCommon:

[0419] 3> Select a destination associated with the NR sidelink discovery as specified in TS23.304

[26] , which is in the SL activity time for SL transmission timing when SL DRX is applied to the destination, and in a logical channel that satisfies all of the following conditions for SL permission associated with SCI:

[0420] 4> SL data used for NR side link discovery can be used for transmission; and

[0421] 4> In the case of any logical channel having SBj>0, SBj>0; and

[0422] 4> If configured, sl-configuredGrantType1Allowed is set to true if the SL grant is configured as grant type 1; and

[0423] 4> If configured, sl-AllowedCG-List contains a configured permission index associated with SL permission.

[0424] 2> Otherwise:

[0425] 3> Select a destination associated with one of unicast, multicast, and broadcast (excluding destinations associated with NR sidelink discovery as specified in TS23.304

[26] ), which is in the SL activity time for SL delivery timing when SL DRX is applied to the destination, and has at least one of MAC CE and a logical channel with the highest priority, among logical channels that satisfy all of the following conditions of SL permission associated with SCI and MAC CE (if present):

[0426] 4> SL data used for NR side-link communication can be transmitted; and

[0427] 4> In the case of any logical channel having SBj>0, SBj>0; and

[0428] 4> If configured, sl-configuredGrantType1Allowed is set to true if the SL grant is configured as grant type 1; and

[0429] 4> If configured, sl-AllowedCG-List contains a configured permission index associated with SL permission; and

[0430] 4> If PSFCH is not configured for SL associated with SCI, then sl-HARQ-FeedbackEnabled is set to disabled.

[0431] 1> Otherwise:

[0432] 2> Select a destination associated with one of unicast, multicast, and broadcast, wherein the destination is in the SL activity time for SL delivery timing when SL DRX is applied to the destination, and has at least one of MAC CE and a logical channel with the highest priority, among logical channels that satisfy all of the following conditions of SL permission associated with SCI and MAC CE (if present):

[0433] 3>SL data can be used for transmission; and

[0434] 3> In the case of any logical channel having SBj>0, SBj>0; and

[0435] 3> If configured, sl-configuredGrantType1Allowed is set to true if the SL grant is configured as grant type 1; and

[0436] 3> If configured, sl-AllowedCG-List contains a configured permission index associated with SL permission; and

[0437] 3> If PSFCH is not configured for SL associated with SCI, then sl-HARQ-FeedbackEnabled is set to disabled.

[0438] Note 1: If multiple destinations have the same highest priority logical channel that satisfies all the above conditions, or if multiple destinations have MAC CE and / or logical channels with the same priority as MAC CE that satisfy all the above conditions, then the choice of which destination to select depends on the UE implementation scheme.

[0439] 1> Select a logical channel from the logical channels belonging to the selected destination that meets all of the following conditions:

[0440] 2>SL data can be used for transmission; and

[0441] 2> If configured, sl-configuredGrantType1Allowed is set to true if the SL grant is configured as grant type 1; and

[0442] 2> If configured, sl-AllowedCG-List contains a configured permission index associated with SL permission; and

[0443] 2> sl-HARQ-FeedbackEnabled is set to a value that meets the following conditions:

[0444] 3> If the PSFCH is configured for sidelink granting associated with SCI and the UE is capable of PSFCH reception:

[0445] 4> If sl-HARQ-FeedbackEnabled is enabled for the highest priority logical channel that meets the above conditions, then sl-HARQ-FeedbackEnabled is enabled; or

[0446] 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.

[0447] 3> Otherwise:

[0448] 4> sl-HARQ-FeedbackEnabled is set to disabled.

[0449] Note 2: The HARQ feedback enable / disable indicator is set to disable the transmission of MAC PDUs for MAC CEs that only carry CSI reports, MAC CEs or sidelink DRX commands, MAC CEs or sidelink UE-to-UE coordination requests, or MAC CEs or sidelink UE-to-UE coordination information.

[0450] 5.22.1.4.1.3 Allocation of Sidelink Resources

[0451] For each SCI corresponding to a new transfer, the MAC entity should:

[0452] 1> Allocate resources to logical channels as follows:

[0453] 2> In Section 5.22.1.4.1.2, logical channels for which SBj > 0 are permitted to be selected for SL 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 the lower priority logical channel;

[0454] 2> Decrement SBj by the total size of the MAC SDU serving the above logical channel j;

[0455] 2. If any resources remain, all logical channels selected in Section 5.22.1.4.1.2 shall be served in strictly descending order of priority (regardless of the value of SBj) until the data or SL permitted for said logical channel is exhausted (whichever occurs first). Logical channels configured with the same priority shall be served equally.

[0456] Note 1: The value of SBj can be negative.

[0457] The UE will also follow the following rules during the above SL scheduling procedure:

[0458] - If the entire SDU (or a partially transmitted SDU or a retransmitted RLC PDU) is fitted into the remaining resources of the associated MAC entity, the UE should not segment the RLC SDU (or a partially transmitted SDU or a retransmitted RLC PDU).

[0459] - If the UE segments the RLC SDU from the logical channel, it will maximize the size of the segment to satisfy as many permissions as possible for the associated MAC entities;

[0460] - The UE should maximize data transmission;

[0461] - If a MAC entity is provided with a sidelink permission size equal to or greater than 12 bytes, and has available data and is allowed to be transmitted (according to Section 5.22.1.4.1), the MAC entity should not transmit only padding;

[0462] - Logical channels configured with sl-HARQ-FeedbackEnabled that are set to enabled and logical channels configured with sl-HARQ-FeedbackEnabled that are set to disabled cannot be multiplexed into the same MAC PDU.

[0463] A MAC entity should not generate a MAC PDU for a HARQ entity if the following conditions are met:

[0464] - There is no sidelink CSI report MACCE generated for this PSSCH transmission as specified in Section 5.22.1.7; and

[0465] - There is no sidelink DRX command MACCE generated for this PSSCH transmission as specified in Section 5.22.1.8; and

[0466] - There is no sidelink UE-to-UE coordination request MAC CE generated for this PSSCH transmission as specified in Section 5.22.1.9; and

[0467] - There is no sidelink UE-to-UE coordination information MAC CE generated for this PSSCH transmission as specified in Section 5.22.1.10; and

[0468] - A MAC PDU contains zero MAC SDUs.

[0469] Logical channels should be prioritized according to the following order (highest priority listed first):

[0470] -Data from SCCH;

[0471] - Side link CSI report MAC CE;

[0472] - Sidelink UE-to-UE Coordination Request (MAC CE) and Sidelink UE-to-UE Coordination Information (MAC CE);

[0473] -Side link DRX command MAC CE;

[0474] - Data from any STCH.

[0475] Note 2: The priority order between the sidelink UE coordination request MAC CE and the sidelink UE coordination information MAC CE depends on the UE implementation scheme.

[0476] 5.22.1.4.2 Multiplexing of MAC Control Elements and MAC SDUs

[0477] The MAC entity shall multiplex the MAC CE and MAC SDU in the MAC PDU in accordance with Sections 5.22.1.4.1 and 6.1.6.

[0478] …

[0479] 5.22.1.7 CSI Report

[0480] The Sidelink Channel State Information (SL-CSI) reporting procedure is used to provide sidelink channel state information to peer UEs, as specified in section 8.5 of TS 38.214[7].

[0481] The RRC configuration uses the following parameters to control the SL-CSI reporting procedure:

[0482] -sl-LatencyBoundCSI-Report, which is maintained for each PC5-RRC connection.

[0483] The MAC entity maintains the sl-CSI-ReportTimer for each pair of source stratum 2ID and destination stratum 2ID corresponding to a PC5-RRC connection. The sl-CSI-ReportTimer is used to report SL-CSI to ensure the UE complies with the latency requirements for transmission triggered by the CSI. The value of the sl-CSI-ReportTimer is the same as the latency requirements for SL-CSI reporting configured by RRC in the sl-LatencyBoundCSI-Report.

[0484] For each pair of source layer 2ID and destination layer 2ID corresponding to a PC5-RRC connection established by the upper layer, the MAC entity should:

[0485] 1> If the SL-CSI report has been triggered by SCI and has not been cancelled:

[0486] 2> If the sl-CSI-ReportTimer used to trigger the SL-CSI report is not running:

[0487] 3> Start sl-CSI-ReportTimer.

[0488] 2> If the sl-CSI-ReportTimer used to trigger the SL-CSI report expires:

[0489] 3> Cancel the triggered SL-CSI report.

[0490] 2> Otherwise, if the MAC entity has SL resources allocated for the new transmission, and the SL-SCH resources are suitable for the SL-CSI report MAC CE and its sub-headers due to logical channel priority ordering:

[0491] 3> Instruct the multiplexer and assembler to generate the sidelink CSI report MACCE as defined in Section 6.1.3.35;

[0492] 3> Stop the sl-CSI-ReportTimer used for the triggered SL-CSI report;

[0493] 3> Cancel the triggered SL-CSI report.

[0494] 2> Otherwise, if the MAC entity is already configured with sidelink resource allocation mode 1:

[0495] 3> Trigger a scheduling request.

[0496] ***************************Quotation[3]End*******************************

[0497] In [4]RP-231460, “New WID for Extended and Improved NR Positioning”, Intel introduced WID for extended and improved NR positioning.

[0498] ***************************Quotation[4]Begins*******************************

[0499] 3. Argumentation

[0500] In version 17, 3GPP RAN studied “NR positioning enhancement” and “Scenarios and requirements for NR positioning use cases in, partially covered and out of coverage”.

[0501] The study on "Scenarios and Requirements for NR Positioning Use Cases in Coverage Areas, Partial Coverage Areas, and Out-of-Coverage Areas" focuses on V2X and public safety use cases, and the results are documented in TR38.845. Additionally, SA1 has defined requirements for "ranging-based services" in TS22.261 and positioning accuracy requirements for IIoT use cases in out-of-coverage scenarios in TS22.104.

[0502] …

[0503] To determine scenarios and requirements, bandwidth requirements, and solutions supporting sidelink ranging / positioning, improve the integrity, accuracy, and power efficiency of NR positioning solutions, and evaluate the positioning performance of RedCap UEs, 3GPP conducted a Rel-18 study project on "Extended and Improved NR Positioning." The results are documented in 3GPP TR 38.859.

[0504] Based on research, various features and enhancements have been recommended for the specification work to support sidelink ranging / positioning, support the integrity of positioning methods that rely on RAT, enhance features to implement the LPHAP use cases defined in TS22.104, and support RedCap UE positioning with acceptable positioning accuracy considering the requirements of IIoT, commercial, public safety, and V2X use cases.

[0505] …

[0506] 4. Objectives

[0507] 4.1 The Objectives of the Core Component (WI)

[0508] The goal of this work project is to specify a solution to introduce sidelink ranging / positioning, introduce the integrity of the positioning method that depends on RAT, enable LPHAP use case 6 as defined in TS22.104, improve positioning accuracy, and introduce support for positioning of RedCap UE.

[0509] The specific objectives of this work project are:

[0510] 1. Specifies a solution that supports side-link localization (including ranging) in NR systems, including the following [RAN1, RAN2, RAN3, RAN4]:

[0511] a. Specify that SL PRS supports sidelink localization, so that SL PRS uses a comb-based (not excluding fully RE-mapped modes) frequency domain structure and a pseudo-random sequence, wherein the existing sequence of DL-PRS is used as the starting point [RAN1].

[0512] i. Specify support for up to 100 MHz of SL PRS bandwidth in the FR1 spectrum.

[0513] ii. Note: SL PRS transmission in FR2 is not excluded, but specific aspects of FR2 will not be specified.

[0514] b. Specify measurements to support RTT-type solutions using SL, SL-AoA, and SL-TDOA [RAN1, RAN2].

[0515] c. Specify support for resource allocation for SL PRS:

[0516] i. Includes resource allocation scheme 1 and scheme 2, where scheme 1 corresponds to network-centric SL PRS resource allocation and scheme 2 corresponds to UE-autonomous SL PRS resource allocation [RAN1].

[0517] 1. Regarding the resource allocation mechanism of SL PRS in Scheme 2:

[0518] a. Study and specify support for sense-based resource allocation and / or random resource selection [RAN1].

[0519] b. Investigate and specify solutions for congestion control of SL PRS and / or UE-to-UE coordination of SL-PRS [RAN1].

[0520] ii. Support resource allocation for resource pools shared with Rel-16 / 17 / 18 sidelinks and resource allocation for dedicated resource pools of SL PRS [RAN1].

[0521] 1. Note: For the (pre)configuration of SL positioning resources in the resource pool shared with Rel-16 / 17 / 18 sidelink communication, backward compatibility with older Rel-16 / 17 UEs should be ensured.

[0522] d. At least based on open-loop power control (OLPC), specify the transmission power control procedure for SL PRS transmission [RAN1].

[0523] e. Specify the transmission and associated UE behavior to support SL PRS transmissions for unicast, multicast (excluding many-to-one) and broadcast [RAN1, RAN2].

[0524] f. Specify report delivery and procedures to facilitate SL positioning [RAN2, RAN3] in all coverage scenarios as well as in PC5-only and combined PC5-Uu scenarios:

[0525] i. Specify the protocol and procedure for SL positioning between UEs (Side Link Positioning Procedure Protocol (SLPP)).

[0526] ii. Specify the protocol and procedure for SL positioning between the UE and the LMF.

[0527] ***************************Quotation[4]End*******************************

[0528] In RAN1#112bis ([5] 3GPP TSG RAN WG1#112bis RAN1 report), there are some agreements regarding sidelink positioning.

[0529] ***************************Quotation[5]Begins*******************************

[0530] agreement

[0531] For Scheme 2, which is based on sensing for resource allocation:

[0532] ●Alternative Option 2: The Rel-16 resource selection (reselection) procedure with and without periodic reservation is the starting point for SL-PRS design in a dedicated resource pool.

[0533] Note: This means that the Rel-17 partial sensing is not considered the starting point of the design.

[0534] agreement

[0535] For Option 2, using the Rel-16 resource selection (reselection) procedure as a starting point in the dedicated resource pool, at least the following potential modifications should be considered:

[0536] ●Modification 1: For RS used to derive L1 SL-RSRP for resource exclusion:

[0537] Option 1: SL-PRS

[0538] Option 2: PSCCH DMRS

[0539] Option 3: PSSCH DMRS (if PSSCH is included in a dedicated resource pool)

[0540] ●Modification 2: For the resource selection window:

[0541] Option 1: For window derivation, use the old method as a starting point and replace the packet delay budget (PDB) with the new delay budget.

[0542] Option 2: Select window provided by higher level

[0543] ●Modification 3: Regarding SL-PRS priority:

[0544] Option 1: Allow a single L1 SL-PRS priority in the resource pool.

[0545] Option 2: Allow multiple L1 SL-PRS priorities in the resource pool

[0546] ●Modification 4: Definition of candidate resources in the resource selection window:

[0547] ○ Option TBD

[0548] ●Revision 5: Reserved interval for SL-PRS:

[0549] Option 1: The value TBD is provided by a higher layer of the UE. The set of values ​​is (pre)configured.

[0550] ●Modification 6: Regarding the sensing window length (T0):

[0551] Option 1: Use the old (pre-) configuration, with values ​​of (100 milliseconds, 1100 milliseconds).

[0552] Option 2: Equal to or greater than the maximum reserved interval

[0553] Option 3: TBD value provided by a higher layer

[0554] ●Modification 7: For the initial S-RSRP threshold and step size, and the target resource ratio X (%):

[0555] ○ Option TBD

[0556] ●Revision 8: Regarding the prioritization of reserved resources:

[0557] ○ Option TBD

[0558] ●Note 1: Other potential modifications and / or other options within each modification are not excluded.

[0559] ●Note 2: Multiple options can be supported for each potential modification.

[0560] agreement

[0561] In Scheme 2, regarding the triggering of SL-PRS,

[0562] -Supports SL-PRS transmission triggered at the physical layer by a higher layer within the UE itself.

[0563] - Operating assumptions: Supports UE-A to request UE-B to transmit SL-PRS via lower-layer signaling sent by UE-A.

[0564] ○ The SL-PRS is transmitted by a higher layer of UE-B in response to a lower layer request from UE-A.

[0565] ○FFS: Lower-layer signaling corresponds to SCI, MAC-CE, or SL-PRS

[0566] ***************************Quotation[5]End*******************************

[0567] In RAN1#113 ([6] RAN1 report of 3GPP TSG RAN WG1#113), there are some agreements regarding sidelink positioning.

[0568] ***************************Quotation [6] begins*******************************

[0569] agreement

[0570] In a dedicated resource pool, unless RAN1 explicitly agrees not to include an AGC symbol for a specific situation (if any), an SL PRS resource is immediately preceded by an AGC symbol.

[0571] agreement

[0572] For dedicated resource pools, at least the SL PRS bandwidth should be the same as the resource pool bandwidth.

[0573] agreement

[0574] For shared resource pools, the SL PRS bandwidth is the same as the bandwidth indicated for PSSCH.

[0575] agreement

[0576] For shared resource pools

[0577] ●SL PRS resources refer to the time-frequency resources used for SL PRS transmission within a time slot.

[0578] ● The characteristics associated with SL PRS resources in a time slot of the shared resource pool include at least:

[0579] ○SL PRS Resource ID,

[0580] ○SL PRS comb offset and associated SL PRS comb size (N),

[0581] ○The number of SL PRS start symbols and SL PRS symbols (M),

[0582] ○SL PRS Frequency Domain Allocation

[0583] • SL PRS frequency domain allocation is not used to identify a unique SL PRS resource ID.

[0584] ●SL PRS resources are identified by a combination of SL PRS resource ID and SL PRS frequency domain allocation. This combination is unique within the time slots of the shared resource pool.

[0585] Note 1: The above does not imply that all these parameters need to be transmitted / (pre-)configured.

[0586] in conclusion

[0587] For dedicated or shared resource pools, at least the following characteristics are not included as part of the characteristics of SL PRS resources:

[0588] ● SL PRS periodicity, number of instances / repetitions

[0589] in conclusion

[0590] Rel-18 does not support TDM-based SL PRS resources from a single UE within a time slot in a dedicated / shared resource pool.

[0591] agreement

[0592] Multiple (M,N) pairs within a time slot in a dedicated resource pool are supported only if different (M,N) pairs within a time slot are consistently multiplexed to different symbol sets via TDM. Only a single (M,N) value can be mapped within one TDM duration (i.e., one symbol set).

[0593] agreement

[0594] For SL PRS in a shared resource pool, the symbols of SL-PRS resources within a time slot are consecutive symbols.

[0595] agreement

[0596] For a dedicated resource pool used for SL positioning, SL-PRS cannot be transmitted in a time slot without an associated PSCCH.

[0597] agreement

[0598] PSSCH is not included in the dedicated resource pool used for SL positioning.

[0599] agreement

[0600] Regarding SCI signaling in the shared resource pool

[0601] ●Supports the new format of Level 2 SCI.

[0602] How does FFS indicate the new Level 2 SCI format?

[0603] ●FFS: If Level 2 SCI indicates both SL-PRS and SL-SCH, then the broadcast type, destination ID, and source ID are shared.

[0604] agreement

[0605] In the shared resource pool,

[0606] ● Regarding PSCCH and SL-PRS multiplexing, alternative solution B.1 of the previous protocol is supported (i.e., TDMing is supported only).

[0607] agreement

[0608] In the shared resource pool, the SL-PRS, the associated PSCCH, and the PSSCH scheduled by the PSCCH are contained in the same time slot:

[0609] ● Regarding PSSCH and SL-PRS multiplexing, for the agreed comb sizes 1, 2, and 4, only the TDMing protocol is supported.

[0610] In the shared resource pool, the SL-PRS, the associated PSCCH, and the PSSCH scheduled by the PSCCH are contained in the same time slot:

[0611] ●PSSCH is used for the second SCI and SL-SCH.

[0612] Note: The UE may not have any data available for transmission. How the specification supports this situation is defined depends on RAN2.

[0613] agreement

[0614] PSFCH is not included in the dedicated resource pool used for SL positioning.

[0615] agreement

[0616] In a dedicated resource pool,

[0617] ●Regarding the allocation of SL-PRS time-domain resources within the resource pool, support is provided.

[0618] ○ Allocation of SL-PRS resources

[0619] ● The SCI used for SL-PRS should indicate at least the following values:

[0620] ○Source ID

[0621] ○ Destination ID

[0622] ○Resource reservation period

[0623] ○SL-PRS Priority

[0624] ○Broadcast type

[0625] Regarding SL-PRS configuration and / or SL-PRS time assignment information, select an alternative for RAN1#114:

[0626] ■ Alternative Solution 3.1: Support a one-to-one mapping relationship between PSCCH resources and associated SL-PRS resources in the same time slot.

[0627] ●Note: In this case, it is not necessary to explicitly transmit which SL PRS resource is used for the same time slot.

[0628] ●Note: The same number of PSCCH resources and SL-PRS resources

[0629] …

[0630] agreement

[0631] In Option 2, regarding the triggering of SL-PRS, the relevant WAs for shared and dedicated resource pools are confirmed.

[0632] ● Regarding lower-layer signaling, SCI associated with SL-PRS transmission is supported.

[0633] ○FFS: Is this enabled via (pre-)configuration?

[0634] ●FFS: Also supports SL-PRS

[0635] agreement

[0636] For Option 2, in a dedicated resource pool,

[0637] - Multiple L1 SL-PRS priorities are allowed in the resource pool.

[0638] - SL PRS resources within the resource selection window are used as candidate resources.

[0639] - Regarding the reserved interval for SL-PRS, the value TBD is provided by the higher layer of the UE. The value set is (pre)configured.

[0640] ○ Use the periodicity available for legacy SL communication and the periodicity defined for DL-PRS as the starting point.

[0641] - Regarding the resource selection (reselection) procedure

[0642] ○ Using Rel-16 reassessment and pre-occupancy as starting points respectively, SL-PRS reassessment and pre-occupancy are supported.

[0643] agreement

[0644] In Scheme 2, congestion control can limit the parameter range of the SL PRS configuration for each resource pool using CBR and priority. Further consider the following parameters:

[0645] ●Option 1: SL PRS transmission power

[0646] ●Option 2: Periodicity of SL PRS

[0647] ●Option 3: Number of occupied sub-channels in SL-PRS (for shared resource pools)

[0648] ●Option 4: Number of SL PRS resources in a time slot

[0649] ●Option 5: Comb size of SL PRS resources in a time slot

[0650] ●Option 7: Number of OFDM symbols for SL PRS resources in a time slot

[0651] ●Option 8: Number of SL PRS transmissions (retransmissions)

[0652] ●FFS: Other options are not excluded.

[0653] agreement

[0654] In the dedicated resource pool, the PSCCH channel structure of SL communication is reused at least in the following aspects:

[0655] ●The first PSCCH symbol is mapped to the second symbol in the time slot that can be used for SL transmission.

[0656] Note: The first symbol available for SL transmission in a time slot is used for PSCCH AGC, similar to the old version.

[0657] ● The PSCCH DM-RS in the time slot is reused from the old version.

[0658] ● The number of PSCCH symbols is (pre-)configured (selected downwards at RAN1#114):

[0659] Alternative Option 1: 2 or 3 symbols (same as the old version)

[0660] Alternative Option 3: 1, 2, or 3 symbols

[0661] ● Configure the number of PRBs using legacy values ​​(pre-configured)

[0662] ○FFS: Reconsider whether to support a single-symbol PSCCH

[0663] ***************************Quotation[6]End*******************************

[0664] In RAN1#114 ([7] RAN1 report of 3GPP TSG RAN WG1#114), there are some agreements regarding sidelink positioning.

[0665] ***************************Quotation[7]Begins*******************************

[0666] agreement

[0667] In the shared resource pool:

[0668] ●Option B: SL PRS is mapped to adjacent symbols before, between (as a working assumption) or after the PSSCH DMRS symbols.

[0669] agreement

[0670] For the dedicated SL PRS resource pool, SL PRS is used as a path loss reference for OLPC for SL PRS (option 1 from RAN1#112bis-e and RAN1#113 meetings).

[0671] in conclusion

[0672] For dedicated resource pools, Rel-18 only supports the case where the SL PRS bandwidth is the same as the resource pool bandwidth.

[0673] agreement

[0674] For dedicated resource pools, the explicit (pre)configuration of SL PRS resources in a time slot includes:

[0675] ●SL PRS resource ID, (M,N) mode, start symbol, comb offset.

[0676] ●FFS: Restrictions on (pre)configuration to address potential AGC issues.

[0677] agreement

[0678] For SL PRS in a dedicated or shared resource pool, for a given valid comb size 'N', for all integer values ​​of 'M', a partially interleaved SL PRS pattern (M,N) is supported such that (M,N) = (1,2) or (2,4).

[0679] agreement

[0680] For dedicated resource pools, regarding SL-PRS configuration and / or SL-PRS time assignment information, alternative solution 3.1 is supported, namely...

[0681] ●Supports a one-to-one mapping relationship between PSCCH resources and associated SL-PRS resources in the same time slot.

[0682] Note: In this case, it is not necessary to explicitly specify which SL PRS resource to use for the same time slot.

[0683] Note: The same number of PSCCH resources and SL-PRS resources

[0684] agreement

[0685] For PSCCH configuration in the dedicated resource pool

[0686] ● The number of PSCCH PRBs in the (pre-)configured resource pool:

[0687] Alternative Option 1: One parameter for all PSCCHs

[0688] agreement

[0689] For PSCCH configuration in the dedicated resource pool

[0690] ● The number of PSCCH symbols is (pre-)configured to 2 or 3 symbols (same as the old version).

[0691] agreement

[0692] In a shared resource pool, when PSSCH and SL-PRS are multiplexed in the same time slot, they share the same source ID, destination ID, and broadcast type fields.

[0693] agreement

[0694] ● Regarding Scheme 2, in the dedicated resource pool, regarding the sensing window length:

[0695] ○ Use the old (pre-) configuration, where the values ​​are (100 milliseconds, 1100 milliseconds)

[0696] ● For Scheme 2, in the dedicated resource pool, the old values ​​from the NR side link are reused for the initial S-RSRP threshold and step size, and the target resource ratio X (%).

[0697] agreement

[0698] For scheme 2, in the dedicated resource pool, for the resource selection (reselection) procedure, the RS used to derive L1 SL-RSRP for resource exclusion is at least PSCCH DMRS.

[0699] ●FFS: SL-PRS can be (pre-)configured to derive L1 SL-RSRP for resource exclusion.

[0700] agreement

[0701] In the shared resource pool,

[0702] 1. Aspect 4: In addition to SL-PRS-specific parameters, the following information related to PSSCH scheduling is used to indicate that at least the legacy content of SCI formats 2-A and 2-B is supported in the new Level 2 SCI 2-D.

[0703] 1. FFS: Used to support legacy content in SCI format 2-C.

[0704] Working assumptions

[0705] For Option 2, using the Rel-16 resource selection (reselection) procedure as a starting point in the dedicated resource pool, the following modifications are supported:

[0706] ●Modification 2: For the resource selection window:

[0707] Option 1: For window derivation, use the old method as a starting point and replace the packet delay budget (PDB) with the SL-PRS delay budget.

[0708] Send an LS to RAN2 to inquire whether RAN2 can confirm the working assumptions of RAN1. If not, let RAN2 decide on an alternative solution.

[0709] agreement

[0710] For PSCCH configuration in the dedicated resource pool

[0711] ● The PSCCH is mapped into a single sub-channel, similar to a shared resource pool, and:

[0712] ○ The resource pool is (pre-)configured with the size and number of sub-channels in the PRB, and follows the old method of mapping PSCCH to NR SL resources.

[0713] -FFS: Whether to add additional values ​​for the (pre-configured) sub-channel.

[0714] ○ The PSCCH in the i-th sub-channel is associated with the i-th SL-PRS resource ID.

[0715] Note: If the number of sub-channels is greater than the number of (pre-)configured SL PRS resources, then sub-channels with an index greater than or equal to the number of (pre-)configured SL PRS resources are not mapped to any resources.

[0716] agreement

[0717] Regarding resource allocation in Scheme 2SL-PRS, the following modifications are supported for congestion control of dedicated RPs:

[0718] ●Revision 1: Definitions of SL PRS CR and CBR:

[0719] Alternative Option 2: Redefine CBR / CR by considering SL-PRS resource allocation / configuration.

[0720] agreement

[0721] Regarding resource allocation in Scheme 2SL-PRS, the following modifications are supported for congestion control of dedicated RPs:

[0722] ●Revision 2: RSSI used in evaluating the CBR definition:

[0723] ○ Measure SL-RSSI on the time slot configured for transmitting PSCCH and SL-PRS.

[0724] ○ Measure a single SL-RSSI on the notation of both SL-PRS and PSCCH.

[0725] agreement

[0726] Regarding resource allocation in Scheme 2SL-PRS, the following modifications are supported for congestion control of dedicated RPs:

[0727] ●Regarding the measurement time window size for CR and CBR

[0728] 1. It can be configured separately for a dedicated resource pool and can retrieve older values.

[0729] agreement

[0730] For Scheme 2, in the dedicated resource pool, regarding the procedure for determining the subset of resources to be reported to the higher layer, when the resource selection (reselection) procedure is triggered, the higher layer provides the following parameters for candidate SL-PRS transmissions:

[0731] ●Resource pool from which SL-PRS resources are reported

[0732] ●Priority

[0733] ● Delayed Budget

[0734] ●Reservation period

[0735] ● List of resources used for pre-allocation and re-evaluation

[0736] ● A set of SL-PRS resource IDs, which can contain all (pre-)configured SL-PRS resource IDs.

[0737] in conclusion

[0738] For Scheme 2, in the dedicated resource pool, there is no consensus to support the (pre)configured SL-PRS derivation L1 SL-RSRP for resource exclusion regarding the resource selection (reselection) procedure.

[0739] ***************************Quotation[7]End*******************************

[0740] For the New Radio (NR) Release 16 / 17 sidelink design, sidelink time slots can be used for transmission / reception of the Physical Sidelink Broadcast Channel (PSBCH) or the Physical Sidelink Control Channel (PSCCH) / Physical Sidelink Shared Channel (PSSCH) / Physical Sidelink Feedback Channel (PSFCH). The PSBCH is time-division multiplexed (TDM) from the PSCCH / PSSCH / PSFCH at the time slot level. This means that sidelink time slots, excluding those used for the PSBCH, can be used for PSCCH / PSSCH / PSFCH transmission / reception. Furthermore, the concept of a sidelink resource pool for sidelink communication is used for PSCCH / PSSCH and / or PSFCH transmission / reception. The sidelink (communication) resource pool will include a set of sidelink time slots (excluding at least those used for the PSBCH) and a set of frequency resources. Different sidelink (communication) resource pools can perform TDM and / or Frequency Division Multiplexing (FDM). More specifically, a PSCCH in one sidelink (communication) resource pool can only schedule PSSCH resources within the same sidelink (communication) resource pool. A PSCCH in one sidelink (communication) resource pool cannot schedule PSSCH resources in another sidelink (communication) resource pool. For PSCCH / PSSCH, the associated PSFCH is in the same sidelink (communication) resource pool, not in different sidelink (communication) resource pools.

[0741] A sidelink (communication) resource pool will include multiple subchannels in the frequency domain, where each subchannel comprises multiple adjacent Physical Resource Blocks (PRBs) in the frequency domain. A PRB consists of multiple Resource Elements (REs); for example, a PRB may consist of 12 REs. The configuration of the sidelink resource pool will indicate the number of PRBs for each subchannel within the corresponding sidelink resource pool. Subchannel-based resource allocation in the frequency domain is supported for PSSCH. For PSSCH resources scheduled by PSCCH within the same sidelink time slot, a fixed relationship between the PSCCH and the PSSCH resource is specified, meaning the PSCCH will be located in the lowest (indexed) subchannel of the scheduled PSSCH resource. For scheduled PSSCH resources in different time slots, the starting frequency position of the scheduled PSSCH resource will be scheduled / indicated by sidelink control information rather than a fixed relationship.

[0742] In the current NR version 16 / 17 sidelink design, a Sidelink Control Information (SCI) can indicate up to three PSSCH resources via frequency resource allocation and / or time resource allocation within the SCI. The SCI can include a Level 1 SCI and a Level 2 SCI. The Level 1 SCI can be transmitted via PSCCH. The Level 2 SCI can be transmitted via multiplexing with a scheduled PSSCH resource in the same sidelink time slot, such as the first PSSCH resource. In other words, the SCI can schedule up to two PSSCH resources in a later sidelink time slot, such as the second and / or third PSSCH resources. These up to three PSSCH resources reside in different time slots within the sidelink (communication) resource pool. These up to three PSSCH resources are located within 32 consecutive time slots in the sidelink resource pool. The maximum of three PSSCH resources are used / associated with the same data packet, such as the same Transport Block (TB) or the same Medium Access Control (MAC) Protocol Data Unit (PDU). It should be noted that independent PSCCH / SCI are not supported in the NR side link, meaning that for each PSSCH transmission in a time slot, a corresponding PSCCH / SCI transmission will exist in the same time slot, and vice versa.

[0743] Furthermore, resource reservations for another / different TB via SCI can be (pre)configured by enabling, disabling, or not configuring them in the sidelink (communication) resource pool. When such resource reservations are configured in the sidelink (communication) resource pool, the sidelink (communication) resource pool is configured with a set of reservation period values. Possible reservation periods can be 0, 1:99, 100, 200, 300, 400, 500, 600, 700, 800, 900, 1000ms. The resource reservation period field in the SCI in the sidelink (communication) resource pool can indicate which reservation period value is used for (future) resource reservations. The size / number of the set of reservation period values ​​can be from 1 to 16.

[0744] In the current NR version 16 / 17 sidelink design, two sidelink resource allocation modes are defined for NR sidelink communication:

[0745] 1. Mode 1 refers to the sidelink resources that the base station / network node can schedule for use by the user equipment (UE) for sidelink transmission; or

[0746] 2. Mode 2 is where the UE determines (i.e., the base station / network node does not schedule) the sidelink transmission resources configured by the base station / network node or within the pre-configured sidelink resources.

[0747] For network scheduling modes, such as NR sidelink resource allocation mode 1, network nodes can transmit sidelink (SL) grants on the Uu interface, such as Downlink Control Information (DCI) format 3_0, for scheduling up to three PSSCH resources (for the same data packet). The sidelink grant also includes a "resource pool index" indicating a sidelink (communication) resource pool, where the up to three scheduled PSSCH resources are within the indicated sidelink (communication) resource pool. In response to the received SL grant, the transmission (TX) UE can perform PSCCH and PSSCH transmissions for the data packet on the PC5 interface. The Uu interface signifies the radio interface used for communication between the network and the UE. The PC5 interface signifies the radio interface used for (direct) communication between the UE and the device.

[0748] For UE (autonomous) selection modes, such as NR sidelink resource allocation mode 2, since transmission resources are not scheduled via network nodes, the UE may need to perform sensing before selecting resources for transmission (e.g., sense-based transmission) to avoid resource conflicts and interference with other UEs (especially those using NR sidelinks). Full sensing is supported from NR Rel-16 sidelinks, while partial sensing is supported from NR Rel-17 sidelinks. Based on the results of the sensing procedure, the UE can determine a set of valid / identified resources. This set of valid / identified resources can be reported to a higher layer (of the UE). The UE can (randomly) select one or more valid / identified resources from the set of valid / identified resources to perform sidelink transmissions from the UE. Sidelink transmissions from the UE can be PSCCH and / or PSSCH transmissions.

[0749] When a sense-based resource selection is triggered / requested in slot n, the UE (physical layer) will have an (initial) set of candidate single-slot resources, which includes multiple candidate single-slot resources. The available (initial) set of candidate single-slot resources is limited by a time interval [n+T1, n+T2], which may be referred to as the resource selection window. Preferably, in some embodiments, a candidate single-slot resource may include one or more frequency resource units within a slot, wherein the frequency resource unit may be a sub-channel. As specified in TS 38.214 (e.g., [2] 3GPP TS 38.214 V18.0.0 (2023-09) 3GPP), the candidate single-slot resource R for transmission x,y Defined as a time slot L with sub-channels x+j subCH A set of adjacent sub-channels, where j = 0,...,L subCH -1.

[0750] If full sensing is performed (e.g., [2] 3GPP TS 38.214 V18.0.0 (2023-09) 3GPP), for example, partial sensing is not configured, then the (initial) candidate single-slot resource set is in the (complete) time interval [n+T1, n+T2]. The UE (physical layer) should listen to / sensor the slots within the sensing window.

[0751] When performing / configuring partial sensing (e.g., [2] 3GPP TS 38.214 V18.0.0 (2023-09) 3GPP), the UE (physical layer) determines, through its implementation, a candidate time slot set consisting of at least Y candidate time slots within time intervals [n+T1, n+T2], wherein the (initial) candidate single time slot resource set is in the time slot set. For periodic-based partial sensing, if the time slot Within the candidate time slot set, the UE (physical layer) should listen to / sensor any time slot within the sensing window. For adjacent portion sensing, the UE (physical layer) should listen to / sensor the time slots [n+T] within the sensing window. A ,n+T B ], where T is selected A and T B Both of these enable the UE (physical layer) to have sensing results starting from at least M consecutive logical time slots prior to the first time slot among the selected Y candidate time slots.

[0752] Based on the sensing results, the UE (physical layer) can generate a valid / identified resource set, which is a subset of the (initial) candidate single-slot resource set. The generation of the valid / identified resource set can be performed by excluding some candidate single-slot resources from the (initial) candidate single-slot resource set. If the remaining candidate single-slot resources after the exclusion step are less than X times the number of the (initial) candidate single-slot resource set (e.g., depending on the prototyping parameters), then the UE can generate a valid / identified resource set. TX If the threshold is any one of 20%, 35%, or 50% (the association is configured in the sidelink resource pool configuration), the UE can re-execute the exclusion step by increasing the power threshold by 3dB. Subsequently, the UE's (physical layer) can determine the valid / identified resource set. Resource selection for sidelink transmission performed by the UE's higher layer (MAC layer) can be randomly selected from the valid / identified resource set.

[0753] It should be noted that for side links, the priority value is any one of 1 to 8, and a lower priority value means a higher priority.

[0754] In NR Release 18 (e.g., [4] RP-231460), “NR Positioning Enhancement” will investigate the requirements for higher accuracy, lower latency, higher integrity, and reliability positioning due to new 5G applications and vertical industries. The feasibility of potential solutions for SL positioning will also be considered, including relative positioning, ranging, and absolute positioning, where SL positioning operates in the PC5 interface between devices or between devices. A device can mean a UE or be replaced by a UE.

[0755] RAN1 agreed to study a round-trip time (RTT)-type solution for a positioning method using SL that supports measurements using SL, the angle of arrival (AoA) of SL, the time difference of arrival (TDOA) of SL, and the angle of departure (AoD) of SL. Therefore, a new reference signal for SL positioning / ranging will be introduced, which is called the SL positioning reference signal (PRS). To support time-based positioning methods, a larger bandwidth for SL PRS is required for higher accuracy positioning. The required bandwidth for SL PRS is likely to be 10 MHz, 20 MHz, or even higher, especially in higher frequency bands. Regarding SL positioning resource allocation, there are two sidelink resource pools: a dedicated resource pool for SL-PRS and a resource pool shared with sidelink communication (i.e., PSCCH / PSSCH and / or PSFCH). Sharing the resource pool with sidelink communication means that the SL PRS transmission can be multiplexed with the PSCCH / PSSCH / PSFCH resources in the shared resource pool.

[0756] In addition, the sidelink control information of the TX UE can schedule / indicate / assign SL PRS resources so that the receiving (RX) UE knows where / when to receive / measure the corresponding SL PRS. The sidelink control information for scheduling / indicating / assigning SL PRS resources can be transmitted on the PSCCH in the dedicated resource pool for SL-PRS, or on the PSCCH and / or the second-level SCI in the shared resource pool.

[0757] In addition, given the larger bandwidth requirement for SL PRS, a comb-like-N SL-PRS design can be supported to provide more available SL PRS resources, and the number of configured / adjusted symbols can be supported as one SL PRS occasion. Potential candidate values for N can be 1, 2, 4, 6, and given M symbols and comb-like-N, there are at least some possible SL PRS pattern designs:

[0758] 1. A fully interleaved SL-PRS pattern, M = N, and at each symbol, a different RE offset is used, or

[0759] 2. A partially interleaved SL-PRS pattern, M < N, and at each symbol, a different RE offset is used, or

[0760] 3. A non-interleaved SL-PRS style, N > 1, and at each symbol, the same RE offset is used

[0761] Preferably, in some embodiments, for a comb-N SL-PRS design / structure, the possible frequency / comb offset can be 0 to (N-1).

[0762] For SL PRS resource allocation, Scheme 1 and Scheme 2 were introduced.

[0763] 1. Option 1: Network-centric operation of SL-PRS resource allocation (e.g., similar to the legacy NR Mode 1 solution).

[0764] a. Networks (e.g., next-generation NodeB (gNB), Location Management Function (LMF), gNB and LMF) allocate resources for SL-PRS.

[0765] Option 2: TX UE-autonomous SL-PRS resource allocation (e.g., similar to the old NR Mode 2 solution).

[0766] a. At least one of the UEs participating in the sidelink positioning operation is allocated resources for SL-PRS.

[0767] For scheme 1, the network node can transmit SL grants for scheduling SL PRS resources in a dedicated resource pool, such as DCI format 3_2. The network node can also transmit SL grants for scheduling PSSCH resources in a shared resource pool, such as DCI format 3_0, and the TX UE determines whether to multiplex the SL PRS transmission in the scheduled PSSCH resources.

[0768] For the dedicated resource pool in Scheme 2, the TX UE can perform sensing on SL PRS resources during the sensing duration and then exclude candidate SL PRS resources based on the sensing results. After the exclusion step, the TX UE can determine the valid candidate SL PRS resources and then randomly select some candidate SL PRS resources from them. For the shared resource pool in Scheme 2, the TX UE can perform sensing, determine the valid candidate PSSCH resources, and then randomly select some candidate PSSCH resources from them (following the legacy NR mode). The TX UE determines whether to multiplex SL PRS transmissions in the selected PSSCH resources. For the dedicated resource pool of SL-PRS, it is agreed to support TDM-based multiplexing of SL PRS within a time slot, wherein the maximum number of SL PRS opportunities via TDM within a time slot is 4 (e.g., RAN1 report of 3GPP TSG RAN WG1#113 [6]).

[0769] As specified in TS 38.214 (e.g., [2] 3GPP TS 38.214 V18.0.0 (2023-09) 3GPP), when a sense-based resource selection for a PSSCH resource is triggered / requested in slot n, the UE will determine an (initial) candidate single-slot resource set, which includes multiple candidate single-slot resources limited by a time interval [n+T1, n+T2] (i.e., the resource selection window). The UE may exclude some candidate single-slot resources from the (initial) candidate single-slot resource set based on the sense results. After exclusion, the UE may determine a set of valid / identified resources to be reported to the higher layer of the UE. The higher layer of the UE may (randomly) select one or more valid / identified resources from the set of valid / identified resources to perform PSSCH transmission carrying an SL MAC PDU. Considering latency requirements, when triggering / requesting sense-based resource selection for PSSCH resources, the higher layers of the UE will provide the remaining packet delay budget (PDB) of the SL data available in the logical channel, where the remaining PDB is used to determine the end time of the time interval [n+T1, n+T2]. The SL data available in the logical channel can be transmitted via PSSCH on one or more selected valid / identified resources (i.e., the SL data available in the logical channel can be included / contained in the SL MAC PDU). If T 2min If T2 is shorter than the remaining PDB (in the time slot), then T2 depends on the experience T. 2min UE implementations where T2 ≤ Remaining PDB (in the time slot); otherwise, T2 is set to Remaining PDB (in the time slot). Furthermore, when the UE (randomly) selects one or more valid / identified resources from the set of valid / identified resources, the UE will consider the latency requirements of the remaining PDB and / or triggered SL Channel State Information (CSI) reports (e.g., when the SL MAC PDU includes / contains the triggered SL-CSI report) and / or the latency requirements for sidelink UE-to-UE coordination information transmission (e.g., when the SL MACPDU includes / contains sidelink UE-to-UE coordination information).

[0770] Regarding SL PRS in Scheme 2 within the dedicated resource pool, the UE can perform sense-based resource selection for SL PRS resources, which is designed by using sense-based resource selection for PSSCH resources as a starting point and considering some modifications. According to the agreements in RAN1#112bis (e.g., RAN1 report of [5] 3GPP TSG RAN WG1#112bis), RAN1#114 (e.g., RAN1 report of [7] 3GPP TSG RAN WG1#114), and TS 38.214 (e.g., 3GPP TS38.214V18.0.0(2023-09) 3GPP), one modification is replacing the PDB with a new delay budget for SL PRS. Since SL PRS is not part of / from SL data in the sidelink logical channel, there is no PDB for SL PRS. The new delay budget for SL PRS can mean / represent the delay requirements for SL PRS transmission, therefore selecting SL PRS resources can ensure that the delay requirements for SL PRS transmission are met.

[0771] Regarding SL PRS in Scheme 2 within the shared resource pool, since SL PRS transmission is multiplexed with PSSCH, the UE can perform sense-based resource selection for PSSCH resources and multiplex SL PRS transmission with PSSCH transmission on the selected PSSCH resources. However, in sense-based resource selection for PSSCH resources within the shared resource pool specified in TS 38.214 (e.g., [2] 3GPP TS 38.214V18.0.0(2023-09)3GPP), the new delay budget for SL PRS is not taken into account, and the selected PSSCH resources may not meet the latency requirements for SL PRS transmission.

[0772] To address these issues, some concepts, mechanisms, methods, or embodiments are provided in the following disclosure.

[0773] The UE can receive / has a configuration for the sidelink resource pool for PSSCH transmission / reception and SL PRS transmission / reception.

[0774] The UE can perform a first sense-based resource selection triggered / requested in the first time slot n to select one or more sidelink resources from the sidelink resource pool. The UE can determine a procedure for determining a subset of sidelink resources and select one or more sidelink resources from the subset of sidelink resources.

[0775] The UE can determine an initial set of candidate single-slot resources, including multiple candidate single-slot resources, within a time interval [n+T1, n+T2]. The time interval [n+T1, n+T2] can be referred to as the resource selection window.

[0776] The UE can exclude some candidate single-slot resources from the (initial) candidate single-slot resource set based on sensing results. After exclusion, the UE can determine the subset of sidelink resources to be reported to higher layers. The higher layers of the UE can (randomly) select one or more sidelink resources from the reported subset of sidelink resources.

[0777] The UE can perform a first PSSCH transmission carrying a first SL MAC PDU, and perform a first SL PRS transmission on a first side link resource selected from one or more side link resources. Preferably, in some embodiments, the first SL PRS transmission and the first PSSCH transmission are multiplexed on the first side link resource.

[0778] Concept A

[0779] Concept A is that the UE can determine the time interval [n+T1, n+T2] based on the (remaining) packet delay budget and the (remaining) delay budget associated with the first SL PRS. Preferably, in some embodiments, the UE can determine T2 based on the (remaining) packet delay budget and the (remaining) delay budget associated with the first SL PRS.

[0780] Preferably, in some embodiments, the SL MAC PDU may include SL data in / from a sidelink logical channel. The packet delay budget may be determined using / associated with the SL data or the sidelink logical channel.

[0781] Preferably, in some embodiments, the delay budget associated with the first SL PRS may be provided by a higher layer, such as the Long Term Evolution (LTE) Positioning Protocol (SLPP) or the application layer. Preferably, in some embodiments, the first SL PRS may not belong to SL data. Preferably, in some embodiments, the first SL PRS may not belong to the sidelink logical channel used for SL data. Preferably, in some embodiments, the SL MAC PDU does not include the first SL PRS.

[0782] In one embodiment A1, the UE may determine T2 and / or the resource selection window based on the smaller / shorter of the (remaining) packet delay budget and the (remaining) delay budget associated with the first SL PRS.

[0783] Preferably, in some embodiments, when the (remaining) packet delay budget is less than / shorter than (or equal to) the (remaining) delay budget associated with the first SL PRS, the UE can determine T2 and / or the resource selection window based on the (remaining) packet delay budget. Preferably, in some embodiments, when T 2min When the delay is shorter than the remaining packet delay budget (within the time slot), T2 depends on the experience T. 2min UE implementation scheme where ≤T2≤(remaining) packet delay budget (in time slot). When the remaining packet delay budget (in time slot) is shorter than T. 2min At that time, T2 is set to the (remaining) packet delay budget (in the time slot).

[0784] Preferably, in some embodiments, when the (remaining) delay budget associated with the first SL PRS is less than / shorter than (or equal to) the (remaining) packet delay budget, the UE can determine T2 and / or the resource selection window based on the (remaining) delay budget associated with the first SL PRS. Preferably, in some embodiments, when T 2min When T2 is shorter than the (remaining) delay budget (in the time slot) associated with the first SL PRS, T2 depends on the time spent on T. 2min UE implementation where ≤T2≤ the (remaining) delay budget (in the time slot) associated with the first SL PRS. When the (remaining) delay budget (in the time slot) associated with the first SL PRS is shorter than T... 2min At that time, T2 is set to the (remaining) delay budget (in the time slot) associated with the first SL PRS.

[0785] In one embodiment A2, the UE may determine T2 and / or the resource selection window based on the smaller of the priority value of the (remaining) packet delay budget and the (remaining) delay budget associated with the first SL PRS. Preferably, in some embodiments, the SL MAC PDU or SL data may be associated with a first priority value. The first SL PRS may be associated with a second priority value.

[0786] Preferably, in some embodiments, when the first priority value is less than (or equal to) the second priority value, the UE can determine T2 and / or the resource selection window based on the (remaining) packet delay budget. Preferably, in some embodiments, when T... 2min When the delay is shorter than the remaining packet delay budget (within the time slot), T2 depends on the experience T. 2min UE implementation scheme where ≤T2≤(remaining) packet delay budget (in time slot). When the remaining packet delay budget (in time slot) is shorter than T. 2min At that time, T2 is set to the (remaining) packet delay budget (in the time slot).

[0787] Preferably, in some embodiments, when the second priority value is less than (or equal to) the first priority value, the UE can determine T2 and / or the resource selection window based on the (remaining) delay budget associated with the first SL PRS. Preferably, in some embodiments, when T 2min When T2 is shorter than the (remaining) delay budget (in the time slot) associated with the first SL PRS, T2 depends on the time spent on T. 2min UE implementation where ≤T2≤ the (remaining) delay budget (in the time slot) associated with the first SL PRS. When the (remaining) delay budget (in the time slot) associated with the first SL PRS is shorter than T... 2min At that time, T2 is set to the (remaining) delay budget (in the time slot) associated with the first SL PRS.

[0788] For each embodiment, when the UE performs a second sense-based resource selection for a second PSSCH transmission without using the SL PRS in the multiplexed sidelink resource pool, the UE can determine the corresponding T2 and / or the corresponding resource selection window based on the (remaining) packet delay budget rather than the (remaining) delay budget associated with the SL PRS.

[0789] Concept B

[0790] The UE may determine the time interval [n+T1, n+T2] based on the (remaining) packet delay budget. The UE may or may not determine the time interval [n+T1, n+T2] based on the (remaining) delay budget associated with the first SL PRS. Preferably, in some embodiments, the UE may determine T2 based on the (remaining) packet delay budget. The UE may or may not determine T2 based on the (remaining) delay budget associated with the first SL PRS.

[0791] Preferably, in some embodiments, the SL MAC PDU may include SL data in / from a sidelink logical channel. The packet delay budget may be determined using / associated with the SL data or the sidelink logical channel.

[0792] Preferably, in some embodiments, the delay budget associated with the first SL PRS may be provided by a higher layer (e.g., SLPP or application layer). Preferably, in some embodiments, the first SL PRS may not belong to SL data. Preferably, in some embodiments, the first SL PRS may not belong to the sidelink logical channel used for SL data. Preferably, in some embodiments, the SL MAC PDU does not include the first SL PRS. Preferably, in some embodiments, the delay budget associated with the first SL PRS may refer to / represent / replace the latency requirement of the first SL PRS.

[0793] Concept B states that when a UE (randomly) selects one or more sidelink resources from a reported subset of sidelink resources, the UE can select one or more sidelink resources based at least on the (remaining) packet delay budget and the (remaining) delay budget associated with the first SL PRS. Preferably, in some embodiments, the UE can select one or more sidelink resources such that the one or more sidelink resources are at least within the (remaining) packet delay budget and the (remaining) delay budget associated with the first SL PRS. Preferably, in some embodiments, the one or more sidelink resources are within the (remaining) packet delay budget. Furthermore, the one or more sidelink resources are within the (remaining) delay budget associated with the first SL PRS.

[0794] Preferably, in some embodiments, when the UE performs a second sense-based resource selection for a second PSSCH transmission without requiring SL PRS in the multiplexed sidelink resource pool, the UE may select one or more sidelink resources at least based on the (remaining) packet delay budget. The UE may also select one or more sidelink resources without based on the (remaining) delay budget associated with the SL PRS.

[0795] One possible underlined text proposal for TS 38.321 could be:

[0796] **************************Start of Text Proposal*****************************

[0797] 3> If the sl-InterUE-CoordinationScheme1 for receiving / transmitting with preferred and non-preferred resource sets is not configured by RRC:

[0798] 4> If the random selection of the transmission is configured by the upper layer:

[0799] 5> Based on the amount of selected frequency resources and the remaining PDB of SL data available in the allowed logical channels on the carrier and / or The latency requirement for triggering SL PRS And the latency requirement for the triggered SL CSI report, randomly selecting time and frequency resources from a resource pool that occur within the SL DRX activity time (if configured) of the destination UE as specified in Section 5.28.2 for a transmission opportunity, the destination UE being selected to indicate the aforementioned SL DRX activity time to the physical layer.

[0800] …

[0801] 3> If sl-InterUE-CoordinationScheme1 for receiving / transmitting preferred and non-preferred resource sets is configured via RRC, and the UE determines the resources for transmitting sidelink inter-UE coordination information based on an explicit request from the UE:

[0802] 4> Based on the amount of selected frequency resources, the remaining PDB of SL data available in the logical channels allowed on the carrier. and / or the latency requirement of the triggered SL PRS And / or the delay requirements for the triggered SL-CSI and the delay requirements for the transmission of coordination information between sidelink UEs, the time and frequency resources for a transmission opportunity are randomly selected from the resources indicated by the physical layer as specified in Section 8.1.4 of TS 38.214[7].

[0803] **************************End of Text Proposal*****************************

[0804] It should be noted that any of the methods, alternatives, concepts, examples and embodiments described above and herein may be combined in whole or in part, or applied simultaneously or individually.

[0805] The following aspects and embodiments are possible in relation to the methods, alternatives, concepts, examples and embodiments detailed above and herein.

[0806] Preferably, in some embodiments, the SL PRS can be the SL Channel State Information Reference Signal (CSI-RS).

[0807] Preferably, in some embodiments, the SL PRS is not the SL CSI-RS.

[0808] Preferably, in some embodiments, SL PRS can represent / replace a side link reference signal.

[0809] Preferably, in some embodiments, the side link reference signal can be applied to / used for (absolute and / or relative) positioning and / or ranging.

[0810] Preferably, in some embodiments, the sidelink reference signal can be applied to / for any of time-based positioning / ranging methods and / or angle-based positioning / ranging methods. Preferably, in some embodiments, the sidelink reference signal can be applied to / for any of TDoA, RTT-based positioning / ranging, AoA, AoD, or carrier phase measurement-based positioning.

[0811] Preferably, in some embodiments, the sidelink reference signal may be an SL beam management RS. Preferably, in some embodiments, the sidelink reference signal may be an SL CSI-RS (for beam management) not combined within the PSSCH (bandwidth) in the frequency domain. Preferably, in some embodiments, the sidelink reference signal may require a large bandwidth. Preferably, in some embodiments, the sidelink reference signal may be used for (high-resolution) positioning, sensing, or imaging. Preferably, in some embodiments, the sidelink reference signal may be used for beam management (e.g., in the frequency range (FR)2).

[0812] Preferably, in some embodiments, any of the concepts, methods, examples, alternatives and embodiments used for SL PRS above and herein can be applied to other / another reference signal (e.g., reference signals designed / introduced in future 5G, 6G, etc.).

[0813] Preferably, in some embodiments, any of the concepts, methods, examples, alternatives and embodiments used for SL PRS above and herein can be applied to SL CSI-RS (for beam management).

[0814] Preferably, in some embodiments, any of the concepts, methods, examples, alternatives and embodiments used for SL PRS above and herein can be applied to reference signals used for (high-resolution) positioning (e.g., reference signals designed / introduced in future 5G, 6G, etc.).

[0815] Preferably, in some embodiments, any of the concepts, methods, examples, alternatives and embodiments used for SL PRS above and herein can be applied to reference signals used for (high resolution) sensing (e.g., reference signals designed / introduced in future 5G, 6G, etc.).

[0816] Preferably, in some embodiments, any of the concepts, methods, examples, alternatives and embodiments used for SL PRS above and herein can be applied to reference signals used for (high resolution) imaging (e.g., reference signals designed / introduced in future 5G, 6G, etc.).

[0817] Preferably, in some embodiments, the sidelink resource pool for PSSCH transmission / reception and SL PRS transmission / reception can be a sidelink (communication) resource pool for PSSCH transmission / reception that is enabled / configured / supports SL PRS transmission / reception / measurement.

[0818] Preferably, in some embodiments, the dedicated resource pool for SL PRS may be a sidelink resource pool that includes / provides SL PRS resources and / or sidelink control resources. Preferably, in some embodiments, the dedicated resource pool for SL PRS does not include sidelink data resources (i.e., does not include PSSCH resources). Preferably, in some embodiments, the dedicated resource pool for SL PRS does not include sidelink feedback resources.

[0819] Preferably, in some embodiments, PSSCH can mean sidelink data transmission.

[0820] Preferably, in some embodiments, PSFCH may mean sidelink feedback transmission.

[0821] Preferably, in some embodiments, PSCCH may mean side link control transmission.

[0822] Preferably, in some embodiments, in order to transmit PSSCH in a time slot or sub-time slot, the TX UE needs to transmit SCI in the time slot or sub-time slot for scheduling PSSCH.

[0823] Preferably, in some embodiments, in order to transmit SL PRS in a time slot or sub-time slot, the TX UE needs to transmit SCI in the time slot or sub-time slot for scheduling SL PRS.

[0824] Preferably, in some embodiments, a timeslot may mean a sidelink timeslot. Preferably, in some embodiments, a timeslot may be represented / replaced as a transmission time interval (TTI).

[0825] Preferably, in some embodiments, a sidelink time slot may mean a time slot used for a sidelink. Preferably, in some embodiments, a TTI may be a subframe (for a sidelink), a time slot (for a sidelink), or a sub-time slot (for a sidelink). Preferably, in some embodiments, a TTI includes multiple symbols, such as 12 or 14 symbols. Preferably, in some embodiments, a TTI may be a time slot that (fully / partially) includes sidelink symbols. Preferably, in some embodiments, a TTI may mean a transmission time interval used for sidelink (data) transmission. Preferably, in some embodiments, a sidelink time slot or a time slot used for a sidelink may contain all Orthogonal Frequency Division Multiplexing (OFDM) symbols available for sidelink transmission. Preferably, in some embodiments, a sidelink time slot or a time slot used for a sidelink may contain a consecutive number of symbols available for sidelink transmission. Preferably, in some embodiments, a sidelink time slot or a time slot used for a sidelink means that the time slot is included / included in a sidelink resource pool.

[0826] Preferably, in some embodiments, the symbol may mean a symbol indicating / configured for use in a side link.

[0827] Preferably, in some embodiments, a time slot may mean / include a sidelink time slot associated with a (sidelink) resource pool. Preferably, in some embodiments, a time slot may not mean / include a sidelink time slot associated with other (sidelink) resource pools.

[0828] Preferably, in some embodiments, adjacent / contiguous time slots may mean adjacent sidelink time slots in / for the (sidelink) resource pool.

[0829] Preferably, in some embodiments, adjacent / contiguous time slots may or may not be adjacent / contiguous in the physical time slots. This means that, from the perspective of physical time slots, adjacent / contiguous time slots in the sidelink resource pool may not be adjacent / contiguous. Preferably, in some embodiments, adjacent / contiguous time slots may or may not be adjacent / contiguous in the sidelink bandwidth part (BWP) or in the sidelink carrier / cell / in the sidelink time slots used for the sidelink bandwidth part or sidelink carrier / cell. This means that, from the perspective of the sidelink time slots in the sidelink BWP or sidelink carrier / cell, adjacent / contiguous time slots in the (sidelink) resource pool may not be adjacent / contiguous. Preferably, in some embodiments, one or more (sidelink) resource pools may exist in the sidelink BWP or sidelink carrier / cell.

[0830] Preferably, in some embodiments, a subchannel is a unit for sidelink resource allocation / scheduling (for PSSCH). Preferably, in some embodiments, a subchannel may include multiple adjacent PRBs in the frequency domain. Preferably, in some embodiments, the number of PRBs for each subchannel may be (pre)configured for a sidelink resource pool. Preferably, in some embodiments, the (pre)configuration of the sidelink resource pool may indicate / configure the number of PRBs for each subchannel. Preferably, in some embodiments, the number of PRBs for each subchannel may be any one of 10, 12, 15, 20, 25, 50, 75, 100. Preferably, in some embodiments, a subchannel may be represented as a unit for sidelink resource allocation / scheduling. Preferably, in some embodiments, a subchannel may mean a set of consecutive PRBs in the frequency domain. Preferably, in some embodiments, a subchannel may mean a set of consecutive resource elements in the frequency domain.

[0831] Preferably, in some embodiments, the first UE may have / maintain / establish multiple sidelink links / connections on the PC5 interface. For different sidelink links / connections, the first UE may perform sidelink transmission to / reception from different paired UEs.

[0832] Preferably, in some embodiments, the first UE may have / maintain / establish a first sidelink link / connection and a second sidelink link / connection. The pair of UEs with the first sidelink link / connection may be different from the pair of UEs with the second sidelink link / connection. Preferably, in some embodiments, the sidelink logical channel associated with the first sidelink link / connection (of the pair of UEs) may be separate from / independent of the sidelink logical channel associated with the second sidelink link / connection (of the pair of UEs).

[0833] Preferably, in some embodiments, the UE may be / means / includes / replaces a device.

[0834] Preferably, in some embodiments, the sidelink transmission / reception can be UE-to-UE transmission / reception. Preferably, in some embodiments, the sidelink transmission / reception can be device-to-device transmission / reception. Preferably, in some embodiments, the sidelink transmission / reception can be Vehicle-to-Everything (V2X) transmission / reception. Preferably, in some embodiments, the sidelink transmission / reception can be Pedestrian-to-Everything (P2X) transmission / reception. Preferably, in some embodiments, the sidelink transmission / reception can be on the PC5 interface.

[0835] Preferably, in some embodiments, the PC5 interface can be a wireless interface for communication between devices. Preferably, in some embodiments, the PC5 interface can be a wireless interface for communication between devices. Preferably, in some embodiments, the PC5 interface can be a wireless interface for communication between UEs. Preferably, in some embodiments, the PC5 interface can be a wireless interface for V2X or P2X communication. Preferably, in some embodiments, the Uu interface can be a wireless interface for communication between a network node and a device. Preferably, in some embodiments, the Uu interface can be a wireless interface for communication between a network node and a UE.

[0836] Preferably, in some embodiments, the first UE can be a first device. Preferably, in some embodiments, the first UE can be a vehicle UE. Preferably, in some embodiments, the first UE can be a V2X UE.

[0837] Preferably, in some embodiments, the second UE can be a second device. Preferably, in some embodiments, the second UE can be a vehicle UE. Preferably, in some embodiments, the second device can be a V2X UE.

[0838] Preferably, in some embodiments, the first UE and the second device are different devices.

[0839] Various examples and embodiments of the present invention are described below.

[0840] refer to Figure 5 Utilizing this and other concepts, systems, and methods of the present invention, a method 1000 for a first device in a wireless communication system includes: receiving / having a configuration of a sidelink resource pool for PSSCH transmission / reception and SL PRS transmission / reception (step 1002); performing a first sense-based resource selection triggered / requested in a first time slot n for selecting one or more sidelink resources in the sidelink resource pool (step 1004); determining an (initial) set of candidate single-slot resources including a plurality of candidate single-slot resources within a time interval [n+T1, n+T2], wherein the first device determines the time interval [n+T1, n+T2] based on a (remaining) packet delay budget and a (remaining) delay budget associated with the first SL PRS (step 1006); determining a subset of sidelink resources after excluding some candidate single-slot resources from the (initial) set of candidate single-slot resources based on sensing results (step 1008); selecting one or more sidelink resources from the subset of sidelink resources (step 1010); and performing a first SL MAC. The first PSSCH transmission of the PDU (step 1012); and the first SL PRS transmission performed on the first side link resource among the selected one or more side link resources (step 1014).

[0841] In various embodiments, the first SL PRS transmission and the first PSSCH transmission are multiplexed on the first-side link resources.

[0842] In various embodiments, the SL MAC PDU includes SL data in / from the sidelink logical channel, and / or packet delay budgets that utilize the SL data or the sidelink logical channel to determine / associate with the SL data or the sidelink logical channel.

[0843] Return to reference Figure 3 and Figure 4 In one or more embodiments, from the perspective of a first device in a wireless communication system, device 300 includes program code 312 stored in memory 310 of a transmitter. CPU 308 can execute program code 312 to: (i) receive / have a configuration of a sidelink resource pool for PSSCH transmission / reception and SL PRS transmission / reception; (ii) perform a first sense-based resource selection triggered / requested in a first time slot n for selecting one or more sidelink resources in the sidelink resource pool; (iii) determine an (initial) set of candidate single-slot resources including multiple candidate single-slot resources within a time interval [n+T1, n+T2], wherein the first device determines the time interval [n+T1, n+T2] based on a (remaining) packet delay budget and a (remaining) delay budget associated with the first SL PRS; (iv) determine a subset of sidelink resources after excluding some candidate single-slot resources from the (initial) set of candidate single-slot resources based on sensing results; (v) select one or more sidelink resources from the subset of sidelink resources; (vi) perform a first PSSCH transmission carrying a first SL MAC PDU; and (vii) perform a first SL PRS transmission on a first sidelink resource among the selected one or more sidelink resources. In addition, CPU 308 can execute program code 312 to perform all the described actions, steps and methods described above, below or otherwise herein.

[0844] refer to Figure 6Utilizing this and other concepts, systems, and methods of the present invention, a method 1020 for a first device in a wireless communication system includes: receiving or having a configuration of a first sidelink resource pool for sidelink data transmission and sidelink reference signal transmission (step 1022); performing a first sense-based resource selection triggered or requested in a first timing for selecting one or more first sidelink resources in the first sidelink resource pool (step 1024); determining a first set of candidate resources within a first time interval, wherein the first time interval is determined at least based on a first remaining packet delay budget (step 1026); determining a first subset of candidate resources after excluding some candidate resources from the first set of candidate resources based on one or more sensing results (step 1028); selecting one or more first sidelink resources from the first subset of candidate resources at least according to a second remaining packet delay budget and a remaining delay budget associated with a first sidelink reference signal (step 1030); and performing first sidelink data transmission and first sidelink reference signal transmission on the first sidelink resources among the selected one or more first sidelink resources (step 1032).

[0845] In various embodiments, the first device does not determine the first time interval based on the remaining delay budget associated with the first sidelink reference signal. To determine the first time interval, the first device does not consider the remaining delay budget associated with the first sidelink reference signal.

[0846] In various embodiments, selecting one or more first-side-link resources based at least on the second remaining packet delay budget and the remaining delay budget associated with the first-side-link reference signal includes or implies selecting one or more first-side-link resources based on the shorter of the second remaining packet delay budget and the remaining delay budget associated with the first-side-link reference signal, and / or selecting one or more first-side-link resources based at least on the second remaining packet delay budget and the remaining delay budget associated with the first-side-link reference signal includes or implies selecting one or more first-side-link resources such that the one or more first-side-link resources are within the second remaining packet delay budget and within the remaining delay budget associated with the first-side-link reference signal, and / or selecting one or more first-side-link resources based at least on the second remaining packet delay budget and the remaining delay budget associated with the first-side-link reference signal includes or implies selecting one or more first-side-link resources such that the one or more first-side-link resources are within the shorter of the second remaining packet delay budget and the remaining delay budget associated with the first-side-link reference signal.

[0847] In various embodiments, the first sidelink data transmission includes a first sidelink data packet, which includes sidelink data in or from a sidelink logical channel, and / or a first remaining packet delay budget determined based on or associated with the sidelink data or the sidelink logical channel, and / or a second remaining packet delay budget determined based on or associated with the sidelink data or the sidelink logical channel, and / or the second remaining packet delay budget is the same as or equivalent to the first remaining packet delay budget, and / or the second remaining packet delay budget is less than or equal to the first remaining packet delay budget.

[0848] In various embodiments, the first sidelink reference signal does not belong to the sidelink logical channel, and / or the first sidelink reference signal and the first sidelink data transmission are multiplexed on the first sidelink resources.

[0849] In various embodiments, determining the first time interval based at least on the first remaining packet delay budget includes or means that the upper limit timing or end timing of the first time interval is determined at least based on the first remaining packet delay budget.

[0850] In various embodiments, the method further includes: receiving or having a configuration of a second sidelink resource pool dedicated to sidelink reference signal transmission; performing a second sense-based resource selection triggered or requested in a second timing for selecting one or more second sidelink resources in the second sidelink resource pool; determining a second set of candidate resources within a second time interval, wherein the second time interval is determined at least based on a remaining delay budget associated with the second sidelink reference signal; determining a subset of second candidate resources after excluding some candidate resources from the second candidate resource set based on one or more sensing results; selecting one or more second sidelink resources from the subset of second candidate resources at least according to the remaining delay budget associated with the second sidelink reference signal; and performing transmission of the second sidelink reference signal on the second sidelink resources among the selected one or more second sidelink resources.

[0851] In various embodiments, the second sidelink resource pool includes sidelink control resources, and / or the second sidelink resource pool does not include sidelink data resources.

[0852] In various embodiments, the first device determines the second time interval not based on any remaining packet delay budget.

[0853] In various embodiments, sidelink data transmission means PSSCH transmission, and / or sidelink reference signal means SL-PRS, and / or sidelink reference signal means SL CSI-RS for beam management, and / or sidelink reference signal is used for any of positioning, ranging, beam management, high-resolution positioning, sensing, or imaging.

[0854] Return to reference Figure 3 and Figure 4 In one or more embodiments, from the perspective of a first device in a wireless communication system, device 300 includes program code 312 stored in memory 310 of a transmitter. CPU 308 may execute program code 312 to: (i) receive or have a configuration of a first sidelink resource pool for sidelink data transmission and sidelink reference signal transmission; (ii) perform a first sense-based resource selection triggered or requested in a first timing for selecting one or more first sidelink resources in the first sidelink resource pool; (iii) determine a first set of candidate resources within a first time interval, wherein the first time interval is determined at least based on a first remaining packet delay budget; (iv) determine a first subset of candidate resources after excluding some candidate resources from the first set of candidate resources based on one or more sensing results; (v) select one or more first sidelink resources from the first subset of candidate resources at least according to a second remaining packet delay budget and a remaining delay budget associated with a first sidelink reference signal; and (vi) perform first sidelink data transmission and transmission of the first sidelink reference signal on the first sidelink resources among the selected one or more first sidelink resources. In addition, CPU 308 can execute program code 312 to perform all the described actions, steps and methods described above, below or otherwise herein.

[0855] Any combination of the concepts or teachings above or herein may be combined, either wholly or in part, together or to form new embodiments. The disclosed details and embodiments may be used to solve at least (but not limited to) the problems mentioned above and herein.

[0856] It should be noted that any of the methods, alternatives, steps, examples, and embodiments presented herein may be used independently, individually, and / or in combination with multiple methods, alternatives, steps, examples, and embodiments.

[0857] Various aspects of this disclosure have been described above. It should be understood that the teachings herein can be implemented in a wide variety of forms, and any specific structure, function, or both disclosed herein are merely representative. Based on the teachings herein, those skilled in the art will understand that the aspects disclosed herein can be implemented independently of any other aspects, and two or more of these aspects can be combined in various ways. For example, an apparatus or method can be implemented using any number of aspects set forth herein. Furthermore, this apparatus or method can be implemented or practiced using structures, functions, or structures and functions other than or different from one or more of the aspects set forth herein. As examples of some of the foregoing concepts, in some aspects, a parallel channel can be established based on the pulse repetition frequency. In some aspects, a parallel channel can be established based on the pulse position or offset. In some aspects, a parallel channel can be established based on a time-hopping sequence. In some aspects, a parallel channel can be established based on the pulse repetition frequency, the pulse position or offset, and the time-hopping sequence.

[0858] Those skilled in the art will understand that information and signals can be represented using any of a variety of different techniques and methods. For example, data, instructions, commands, information, signals, bits, symbols, and chips that may be referenced throughout the above description can be represented by voltage, current, electromagnetic waves, magnetic fields or magnetic particles, light fields or light particles, or any combination thereof.

[0859] Those skilled in the art will further appreciate that the various illustrative logic blocks, modules, processors, components, circuits, and algorithm steps described in conjunction with the aspects disclosed herein can be implemented as electronic hardware (e.g., digital implementations, analog implementations, or a combination of both, designed using source decoding or some other technique) and have instructions in various forms of program or design code (which, for convenience, may be referred to herein as "software" or "software module"), or a combination of both. To clearly illustrate this interchangeability between hardware and software, the various illustrative components, blocks, modules, circuits, and steps have been described above generally in terms of their functionality. Whether this functionality is implemented as hardware or software depends on the specific application and the design constraints imposed on the system as a whole. Those skilled in the art may implement the described functionality in different ways for each specific application, but such implementation decisions should not be construed as causing a deviation from the scope of this disclosure.

[0860] Furthermore, the various illustrative logic blocks, modules, and circuits described in connection with the aspects disclosed herein may be implemented within or executed by an integrated circuit (“IC”), access terminal, or 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 alternatively, the processor may be any conventional processor, controller, microcontroller, or state machine. The processor may also be implemented as a combination of computing devices, such as a combination of a DSP and a microprocessor, multiple microprocessors, one or more microprocessors incorporating a DSP core, or any other such configuration.

[0861] It should be understood that any particular order or hierarchy of steps in any disclosed process is an instance of a sample method. It should be understood that a particular order or hierarchy of steps in the process may be rearranged based on design preferences while remaining within the scope of this disclosure. The appended method claims present elements of various steps in a sample order and are not intended to be limited to any particular order or hierarchy presented.

[0862] The steps of the methods or algorithms described in conjunction with the aspects disclosed herein can be implemented directly in hardware, with a software module executed by a processor, or a combination of both. The software module (e.g., containing executable instructions and associated data) and other data can reside in a data memory, such as RAM memory, flash memory, ROM memory, EPROM memory, EEPROM memory, registers, hard disk, removable disk, CD-ROM, or any other form of computer-readable storage medium known in the art. The sample storage medium can be coupled to a machine such as a computer / processor (for convenience, the machine may be referred to herein as a "processor"), such that the processor can read information (e.g., code) from the storage medium and write information to the storage medium. The sample storage medium can be integrated with the processor. The processor and storage medium can reside in an ASIC. The ASIC can reside in a user equipment. Alternatively, the processor and storage medium can reside as discrete components in a user equipment. Furthermore, in some aspects, any suitable computer program product can include a computer-readable medium comprising code associated with one or more aspects of this disclosure. In some aspects, the computer program product can include packaging material.

[0863] While the invention has been described in conjunction with various aspects and examples, it should be understood that further modifications can be made to the invention. This application is intended to cover any variations, uses, or adaptations of the invention that generally follow the principles of the invention and are included within the scope of known and customary practice in the to which this invention pertains.

Claims

1. A method of a first apparatus performing sidelink resource selection, comprising: receiving or having a configuration of a first sidelink resource pool for sidelink data transmission and sidelink reference signal transmission; performing a first sensing-based resource selection triggered or requested in a first occasion for selecting one or more first sidelink resources in the first sidelink resource pool; determining a first set of candidate resources within a first time interval, wherein the first time interval is determined based at least on a first residual packet delay budget; determining a first subset of candidate resources after excluding some candidate resources from the first set of candidate resources based on one or more sensing results; selecting the one or more first sidelink resources from the first subset of candidate resources according to at least a second residual packet delay budget and a residual delay budget associated with a first sidelink reference signal; and performing a first sidelink data transmission and transmission of the first sidelink reference signal on a first sidelink resource of the selected one or more first sidelink resources, wherein the first sidelink data transmission contains a first sidelink data packet comprising or from sidelink data in a sidelink logical channel, and / or the first residual packet delay budget is determined based on or associated with the sidelink data or the sidelink logical channel, and / or the second residual packet delay budget is determined based on or associated with the sidelink data or the sidelink logical channel.

2. The method of claim 1, wherein the first apparatus does not determine the first time interval based on the residual delay budget associated with the first sidelink reference signal.

3. The method of claim 1, wherein: selecting the one or more first sidelink resources according to at least the second residual packet delay budget and the residual delay budget associated with the first sidelink reference signal comprises selecting the one or more first sidelink resources based on a shorter one of the second residual packet delay budget and the residual delay budget associated with the first sidelink reference signal, and / or selecting the one or more first sidelink resources according to at least the second residual packet delay budget and the residual delay budget associated with the first sidelink reference signal comprises selecting the one or more first sidelink resources such that the one or more first sidelink resources are within the second residual packet delay budget and within the residual delay budget associated with the first sidelink reference signal, and / or selecting the one or more first sidelink resources according to at least the second residual packet delay budget and the residual delay budget associated with the first sidelink reference signal comprises selecting the one or more first sidelink resources such that the one or more first sidelink resources are within the shorter one of the second residual packet delay budget and the residual delay budget associated with the first sidelink reference signal.

4. The method of claim 1, wherein: the second remaining packet delay budget is the same as or equal to the first remaining packet delay budget, and / or the second remaining packet delay budget is less than or equal to the first remaining packet delay budget.

5. The method of claim 1, wherein: the first sidelink reference signal does not belong to the sidelink logical channel, and / or the first sidelink reference signal is multiplexed on the first sidelink resource with the first sidelink data transmission.

6. The method of claim 1, wherein: the determining the first time interval based at least on the first remaining packet delay budget comprises determining an upper or ending occasion of the first time interval based at least on the first remaining packet delay budget.

7. The method of claim 1, further comprising: receiving or having a configuration of a second sidelink resource pool dedicated for the sidelink reference signal transmission; performing a second sensing-based resource selection triggered or requested in a second occasion for selecting one or more second sidelink resources in the second sidelink resource pool; determining a second set of candidate resources within a second time interval, wherein the second time interval is determined based at least on a remaining delay budget associated with a second sidelink reference signal; determining a second subset of candidate resources after excluding some candidate resources from the second set of candidate resources based on one or more sensing results; selecting the one or more second sidelink resources from the second subset of candidate resources based at least on the remaining delay budget associated with the second sidelink reference signal; and performing the transmission of the second sidelink reference signal on a second sidelink resource in the selected one or more second sidelink resources.

8. The method of claim 7, wherein: the second sidelink resource pool comprises sidelink control resources, and / or the second sidelink resource pool does not comprise sidelink data resources.

9. The method of claim 7, wherein the first apparatus does not determine the second time interval based on any remaining packet delay budget.

10. The method of claim 1, wherein: the sidelink data transmission is a physical sidelink shared channel (PSSCH) transmission, and / or the sidelink reference signal is a sidelink positioning reference signal (SL-PRS), and / or the sidelink reference signal is a sidelink channel state information reference signal (CSI-RS) for beam management, and / or the sidelink reference signal is for any one of positioning, ranging, beam management, high resolution positioning, sensing, or imaging.

11. A first apparatus performing sidelink resource selection, comprising: a memory; and a processor operatively coupled to the memory, wherein the processor is configured to execute program code to: receive or have a configuration of a first sidelink resource pool for a sidelink data transmission and a sidelink reference signal transmission; perform a first sensing-based resource selection triggered or requested in a first occasion for selecting one or more first sidelink resources in the first sidelink resource pool; ​ ​ determining a first set of candidate resources within a first time interval, wherein the first time interval is determined based at least on a first remaining packet delay budget; determining a first subset of candidate resources after excluding some candidate resources from the first set of candidate resources based on one or more sensing results; selecting the one or more first sidelink resources from the first subset of candidate resources in dependence on at least a second remaining packet delay budget and a remaining delay budget associated with a first sidelink reference signal; and performing a first sidelink data transmission and a transmission of the first sidelink reference signal on a first sidelink resource of the selected one or more first sidelink resources, wherein the first sidelink data transmission contains a first sidelink data packet comprising sidelink data in or from a sidelink logical channel, and / or the first remaining packet delay budget is determined based on or associated with the sidelink data or the sidelink logical channel, and / or the second remaining packet delay budget is determined based on or associated with the sidelink data or the sidelink logical channel.

12. The first apparatus of claim 11, wherein the first apparatus does not determine the first time interval based on the remaining delay budget associated with the first sidelink reference signal.

13. The first apparatus of claim 11, wherein: selecting the one or more first sidelink resources in dependence on at least the second remaining packet delay budget and the remaining delay budget associated with the first sidelink reference signal comprises selecting the one or more first sidelink resources based on a shorter one of the second remaining packet delay budget and the remaining delay budget associated with the first sidelink reference signal, and / or selecting the one or more first sidelink resources in dependence on at least the second remaining packet delay budget and the remaining delay budget associated with the first sidelink reference signal comprises selecting the one or more first sidelink resources such that the one or more first sidelink resources are within the second remaining packet delay budget and within the remaining delay budget associated with the first sidelink reference signal, and / or selecting the one or more first sidelink resources in dependence on at least the second remaining packet delay budget and the remaining delay budget associated with the first sidelink reference signal comprises selecting the one or more first sidelink resources such that the one or more first sidelink resources are within the shorter one of the second remaining packet delay budget and the remaining delay budget associated with the first sidelink reference signal.

14. The first apparatus of claim 11, wherein: the second remaining packet delay budget is the same or equivalent to the first remaining packet delay budget, and / or the second remaining packet delay budget is less than or equal to the first remaining packet delay budget.

15. The first apparatus of claim 11, wherein: the first sidelink reference signal does not belong to the sidelink logical channel, and / or the first sidelink reference signal is multiplexed with the first sidelink data transmission on the first sidelink resource.

16. The first apparatus of claim 11, wherein: the determining the first time interval based at least on the first remaining packet delay budget comprises determining an upper or ending occasion of the first time interval based at least on the first remaining packet delay budget.

17. The first apparatus of claim 11, wherein the processor is further configured to execute the program code to: receive or have a configuration of a second sidelink resource pool dedicated for the sidelink reference signal transmission; perform a second sensing-based resource selection triggered or requested in a second occasion for selecting one or more second sidelink resources in the second sidelink resource pool; determine a second set of candidate resources within a second time interval, wherein the second time interval is determined based at least on a remaining delay budget associated with a second sidelink reference signal; determine a second subset of candidate resources after excluding some candidate resources from the second set of candidate resources based on one or more sensing results; select the one or more second sidelink resources from the second subset of candidate resources according to at least the remaining delay budget associated with the second sidelink reference signal; and perform the transmission of the second sidelink reference signal on a second sidelink resource in the selected one or more second sidelink resources.

18. The first apparatus of claim 17, wherein: the second sidelink resource pool comprises sidelink control resources, and / or the second sidelink resource pool does not comprise sidelink data resources.

19. The first apparatus of claim 17, wherein the first apparatus does not determine the second time interval based on any remaining packet delay budget.

20. The first apparatus of claim 11, wherein: the sidelink data transmission is a physical sidelink shared channel (PSSCH) transmission, and / or the sidelink reference signal is a sidelink positioning reference signal (SL-PRS), and / or the sidelink reference signal is a sidelink channel state information reference signal (CSI-RS) for beam management, and / or the sidelink reference signal is for any one of positioning, ranging, beam management, high resolution positioning, sensing, or imaging. ​

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