Method executed by user equipment and user equipment

Abstract

The invention provides a method executed by user equipment and the user equipment. The method comprises the following steps: receiving sidewalk communication control information SCI and a physical sidewalk communication shared channel PSSCH on an unlicensed spectrum; and determining a physical resource block allocated by the PSSCH according to the received SCI and the received PSSCH.

Description

Technical Field

[0001] The present invention relates to the field of wireless communication technologies, and particularly to a method performed by a user equipment and a corresponding user equipment. Background Art

[0002] In a traditional cellular network, all communications must pass through a base station. Different from this, D2D communication (Device-to-Device communication) refers to a communication method in which two user equipments directly communicate without passing through the forwarding of a base station or a core network. At the 63rd plenary session of the RAN of the 3rd Generation Partnership Project (3GPP) in March 2014, a research topic on implementing proximity D2D communication services using LTE devices was approved (see Non-Patent Document 1). The functions introduced by LTE Release 12 D2D include:

[0003] 1) Discovery function between neighboring devices in an LTE network coverage scenario;

[0004] 2) Direct broadcast communication (Broadcast) function between neighboring devices;

[0005] 3) High-layer supported unicast and groupcast communication functions.

[0006] At the 66th plenary session of the 3GPP RAN in December 2014, a research project on enhanced LTE eD2D (enhanced D2D) was approved (see Non-Patent Document 2). The main functions introduced by LTE Release 13 eD2D include:

[0007] 1) D2D discovery in a no-network-coverage scenario and a partial-network-coverage scenario;

[0008] 2) Priority processing mechanism for D2D communication.

[0009] Based on the design of the D2D communication mechanism, at the 68th plenary session of the 3GPP RAN in June 2015, a feasibility study topic on V2X based on D2D communication was approved. V2X represents Vehicle to everything, and it is hoped to realize the information interaction between a vehicle and all entities that may affect the vehicle, with the aim of reducing accidents, alleviating traffic congestion, reducing environmental pollution, and providing other information services. The application scenarios of V2X mainly include 4 aspects:

[0010] 1) V2V, Vehicle to Vehicle, that is, vehicle-to-vehicle communication;

[0011] 2) V2P, Vehicle to Pedestrian, which means the vehicle sends warnings to pedestrians or non-motor vehicles.

[0012] 3) V2N, Vehicle to Network, which means the vehicle connects to the mobile network.

[0013] 4) V2I, Vehicle to Infrastructure, which means the vehicle communicates with road infrastructure, etc.

[0014] 3GPP divides the research and standardization work of V2X into three phases. The first phase was completed in September 2016, mainly focusing on V2V, based on LTE Release 12 and Release 13 D2D (also known as sidelink side communication), that is, the formulation of proximity communication technology (see Non-Patent Document 3). V2X stage 1 introduced a new D2D communication interface called the PC5 interface. The PC5 interface is mainly used to solve the communication problems of cellular vehicle-to-everything in high-speed (up to 250 km / h) and high-node-density environments. Vehicles can interact information such as location, speed, and direction through the PC5 interface, that is, vehicles can communicate directly through the PC5 interface. Compared with the proximity communication between D2D devices, the functions introduced by LTE Release 14 V2X mainly include:

[0015] 1) Higher-density DMRS to support high-speed scenarios;

[0016] 2) Introduction of sub-channels to enhance the resource allocation method;

[0017] 3) Introduction of a user equipment sensing mechanism with semi-persistent scheduling.

[0018] The second phase of the V2X research topic belongs to the LTE Release 15 research scope (see Non-Patent Document 4), and the main features introduced include high-order 64QAM modulation, V2X carrier aggregation, short TTI transmission, and also include the feasibility study of transmit diversity.

[0019] At the 3GPP RAN#80 plenary session in June 2018, the corresponding third-phase V2X feasibility study topic based on 5G NR network technology (see Non-Patent Document 5) was approved.

[0020] In the 5G NR V2X project, a resource allocation mode 2 based on user equipment sensing (sensing), or transmission mode 2, is supported. For the resource allocation mode 2 of user equipment sensing, the physical layer of the user equipment senses the transmission resources in the resource pool, which means that the user equipment determines whether to exclude the resources overlapping with the resources indicated by the indication information in the SCI sent by other user equipment it receives, and reports the resources not excluded in the candidate resource set to the upper layer. The upper layer randomly selects resources for PSSCH / PSCCH transmission from the reported resource set.

[0021] At the 3GPP RAN#95e plenary session in March 2022, a standardization research project on the evolution of NR sidelink communication (NR sidelink evolution, abbreviated as NR SL evo) based on what has been standardized (see Non-Patent Document 6) was approved. The research objectives of NR SL evo include the following aspects:

[0022] 1) Research and standardize NR sidelink communication on unlicensed spectrum, abbreviated as SL-U. SL-U includes both resource allocation mode 1 and resource allocation mode 2 of NR sidelink communication. This research project specifically includes:

[0023] a. In SL-U, reuse the channel access technology and operations of NR air interface in unlicensed spectrum communication (NR unlicensed, abbreviated as NR-U). The channel access technology of NR-U refers to the Listen Before Talk (abbreviated as LBT) technology, that is, "listen before talk", which means that the user equipment needs to monitor the channel resources used for transmission before transmission. If the channel is idle, it will transmit; otherwise, it will abandon the transmission.

[0024] b. Research the design framework of physical channels in sidelink communication: that is, make necessary modifications to the structure of physical channels in existing NR sidelink communication to enable SL-U.

[0025] The solution of the present disclosure includes a method for determining the allocation of physical resource blocks (PRBs) for PSSCH transmission in SL-U, and a method for determining the initial transmission opportunity in SL-U.

[0026] Prior art documents

[0027] Non-Patent Documents

[0028] Non - Patent Document 1: RP - 140518, Work item proposal on LTE Device to Device Proximity Services

[0029] Non - Patent Document 2: RP - 142311, Work Item Proposal for Enhanced LTE Device to Device Proximity Services

[0030] Non - Patent Document 3: RP - 152293, New WI proposal: Support for V2V services based on LTE sidelink

[0031] Non - Patent Document 4: RP - 170798, New WID on 3GPP V2X Phase 2

[0032] Non - Patent Document 5: RP - 181480, New SID Proposal: Study on NR V2X

[0033] Non - Patent Document 6: RP - 220300, WID revision: NR sidelink evolution Summary of the Invention

[0034] To solve at least a part of the above - mentioned problems, the present invention provides a method executed by a user equipment and the user equipment, which can improve the reliability of uplink communication on unlicensed spectrum and improve the decoding accuracy of sidelink communication.

[0035] According to the present invention, a method executed by a user equipment is proposed, including the following steps: receiving sidelink communication control information SCI and physical sidelink shared channel PSSCH on unlicensed spectrum; and determining the physical resource blocks allocated by the PSSCH according to the received SCI and PSSCH.

[0036] Preferably, the resource allocation mode of the sidelink communication is configured as a resource allocation mode based on continuous resource blocks RB.

[0037] Preferably, the SCI indicates that the PSSCH allocates M sub - channels in the frequency domain, where M is greater than 1.

[0038] Preferably, the sub-channel with the highest number among the M sub-channels overlaps with a single resource block set and the in-cell guard band physical resource blocks; or the sub-channel with the highest number among the M sub-channels completely coincides with the in-cell guard band physical resource blocks, and / or the sub-channel with the second highest number among the M sub-channels overlaps with a single resource block set and / or the in-cell guard band physical resource blocks; or the resource block RB with the highest number among the sub-channels with the highest number among the M sub-channels overlaps with the in-cell guard band physical resource blocks.

[0039] Preferably, the physical resource blocks allocated to the PSSCH include the physical resource blocks on the M allocated sub-channels, excluding the in-cell guard band physical resource blocks in the sub-channel with the highest number and / or the sub-channel with the second highest number among the M sub-channels.

[0040] In addition, according to the present invention, a method executed by a user equipment is provided, including the following steps: on an unlicensed spectrum, select and generate a selected sidelink communication scheduling grant; for the one selected sidelink communication scheduling grant, perform a transmission resource selection or reselection process; and determine an initial transmission opportunity and a retransmission opportunity for the one selected sidelink communication scheduling grant.

[0041] Preferably, the one selected sidelink communication scheduling grant corresponds to the transmission of one or more MAC protocol data units (PDUs).

[0042] Preferably, the step of performing a transmission resource selection or reselection process includes: selecting time-frequency resources from the resource set indicated by the physical layer for a first transmission opportunity; and if one or more HARQ retransmissions are selected, selecting time-frequency resources from the available resource set indicated by the physical layer for one or more second transmission opportunities.

[0043] Preferably, the step of determining an initial transmission opportunity and a retransmission opportunity for the one selected sidelink communication scheduling grant includes: using the time-frequency resources on the first time slot in the first transmission opportunity in the time domain as the initial transmission opportunity; and using the other time-frequency resources in the first transmission opportunity in the time domain and / or other transmission opportunities as the retransmission opportunity.

[0044] In addition, according to the present invention, a user equipment is provided, including: a processor; and a memory storing instructions, wherein the instructions, when run by the processor, execute the above method.

[0045] Advantages of the Invention

[0046] In the SL-U, the solution of the present invention describes that when the resource allocation method for sidelink communication configured by a higher layer is a resource allocation method based on consecutive resource blocks, if the physical resource block with the highest number in the subchannel with the highest number overlaps with the intra-cell guard band in the cell, then the resource blocks in the subchannel allocated for PSSCH transmission that overlap with the intra-cell guard band are not used for PSSCH transmission, and the remaining resource blocks are used for PSSCH transmission. This solution ensures that when two consecutive resource block sets (RB sets) are not allocated for PSSCH transmission, the physical resource blocks (PRBs) corresponding to the intra-cell guard band between these two resource block sets are not used for PSSCH transmission, reducing interference to the sidelink communication of other user equipment and improving the reliability of sidelink communication on the unlicensed spectrum. At the same time, the solution of the present invention also describes that in the case of transmitting MCSt in multiple consecutive time slots, the media access control layer MAC uses the first sidelink communication resource in the first transmission opportunity in the time domain as the initial transmission opportunity. This solution ensures that other transmission opportunities can be used for retransmission, improving the decoding accuracy of sidelink communication. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] The above and other features of the present invention will become more apparent from the following detailed description in conjunction with the accompanying drawings, where:

[0048] Figure 1 is a schematic diagram showing the basic process of the method executed by a user equipment in the first embodiment of the invention.

[0049] Figure 2 is a schematic diagram showing the basic process of the method executed by a user equipment in the second embodiment of the invention.

[0050] Figure 3 is a block diagram of a user equipment according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0051] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the present invention should not be limited to the specific embodiments described below. In addition, for the sake of simplicity, the detailed description of well-known technologies that have no direct association with the present invention is omitted to prevent confusion in the understanding of the present invention.

[0052] The following takes the 5G mobile communication system and its subsequent evolved versions as an example application environment, and specifically describes multiple embodiments according to the present invention. However, it should be noted that the present invention is not limited to the following embodiments, but is applicable to more other wireless communication systems, such as communication systems after 5G and 4G mobile communication systems before 5G, etc.

[0053] Some of the terms related to the present invention are described below. Unless otherwise specified, the terms related to the present invention are defined herein. The terms given in the present invention may have different naming methods in communication systems such as LTE, LTE-Advanced, LTE-Advanced Pro, NR, and subsequent ones, but unified terms are used in the present invention. When applied to a specific system, they can be replaced with the terms used in the corresponding system.

[0054] 3GPP: 3rd Generation Partnership Project, the Third Generation Partnership Project

[0055] LTE: Long Term Evolution, Long-Term Evolution technology

[0056] NR: New Radio, New Radio, New Air Interface

[0057] PDCCH: Physical Downlink Control Channel, Physical Downlink Control Channel

[0058] DCI: Downlink Control Information, Downlink Control Information

[0059] PDSCH: Physical Downlink Shared Channel, Physical Downlink Shared Channel

[0060] UE: User Equipment, User Equipment

[0061] eNB: evolved NodeB, evolved Node B

[0062] gNB: NR base station, NR base station

[0063] TTI: Transmission Time Interval, Transmission Time Interval

[0064] OFDM: Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing

[0065] CP-OFDM: Cyclic Prefix Orthogonal Frequency Division Multiplexing, Cyclic Prefix Orthogonal Frequency Division Multiplexing

[0066] C-RNTI: Cell Radio Network Temporary Identifier, the cell radio network temporary identifier

[0067] CSI: Channel State Information, the channel state information

[0068] HARQ: Hybrid Automatic Repeat Request, the hybrid automatic repeat request

[0069] CSI-RS: Channel State Information Reference Signal, the channel state information reference signal

[0070] CRS: Cell Reference Signal, the cell-specific reference signal

[0071] PUCCH: Physical Uplink Control Channel, the physical uplink control channel

[0072] PUSCH: Physical Uplink Shared Channel, the physical uplink shared channel

[0073] UL-SCH: Uplink Shared Channel, the uplink shared channel

[0074] CG: Configured Grant, the configured grant

[0075] Sidelink: Sidelink communication

[0076] SCI: Sidelink Control Information, the sidelink control information

[0077] PSCCH: Physical Sidelink Control Channel, the physical sidelink control channel

[0078] MCS: Modulation and Coding Scheme, the modulation and coding scheme

[0079] RB: Resource Block, the resource block

[0080] RE: Resource Element, the resource element

[0081] CRB: Common Resource Block, the common resource block

[0082] CP: Cyclic Prefix, cyclic prefix

[0083] PRB: Physical Resource Block, physical resource block

[0084] PSSCH: Physical Sidelink Shared Channel, physical sidelink shared channel

[0085] FDM: Frequency Division Multiplexing, frequency division multiplexing

[0086] RRC: Radio Resource Control, radio resource control

[0087] RSRP: Reference Signal Receiving Power, reference signal receiving power

[0088] SRS: Sounding Reference Signal, sounding reference signal

[0089] DMRS: Demodulation Reference Signal, demodulation reference signal

[0090] CRC: Cyclic Redundancy Check, cyclic redundancy check

[0091] PSDCH: Physical Sidelink Discovery Channel, physical sidelink discovery channel

[0092] PSBCH: Physical Sidelink Broadcast Channel, physical sidelink broadcast channel

[0093] SFI: Slot Format Indication, slot format indication

[0094] TDD: Time Division Duplexing, time division duplexing

[0095] FDD: Frequency Division Duplexing, frequency division duplexing

[0096] SIB: System Information Block, system information block

[0097] SIB1: System Information Block Type 1, the system information block type 1

[0098] SLSS: Sidelink synchronization Signal, the sidelink communication synchronization signal

[0099] PSSS: Primary Sidelink Synchronization Signal, the primary sidelink communication synchronization signal

[0100] SSSS: Secondary Sidelink Synchronization Signal, the secondary sidelink communication synchronization signal

[0101] PCI: Physical Cell ID, the physical cell identifier

[0102] PSS: Primary Synchronization Signal, the primary synchronization signal

[0103] SSS: Secondary Synchronization Signal, the secondary synchronization signal

[0104] BWP: BandWidth Part, the bandwidth segment / part

[0105] GNSS: Global Navigation Satellite System, the global navigation satellite positioning system

[0106] SFN: System Frame Number, the system (radio) frame number

[0107] DFN: Direct Ftame Number, the direct frame number

[0108] IE: Information Element, the information element

[0109] SSB: Synchronization Signal Block, the synchronization system information block

[0110] EN-DC: EUTRA-NR Dual Connection, LTE-NR dual connection

[0111] MCG: Master Cell Group, the master cell group

[0112] SCG: Secondary Cell Group, the secondary cell group

[0113] PCell: Primary Cell, the primary cell

[0114] SCell: Secondary Cell, the secondary cell

[0115] PSFCH: Physical Sidelink Feedback Channel, the physical sidelink communication feedback channel

[0116] SPS: Semi-Persistant Scheduling, semi-static scheduling

[0117] TA: Timing Advance, uplink timing advance

[0118] PT-RS: Phase-Tracking Reference Signals, phase-tracking reference signals

[0119] TB: Transport Block, the transport block

[0120] CB: Code Block, the coded block / code block

[0121] QPSK: Quadrature Phase Shift Keying, quadrature phase shift keying

[0122] 16 / 64 / 256 QAM: 16 / 64 / 256 Quadrature Amplitude Modulation, quadrature amplitude modulation

[0123] AGC: Auto Gain Control, automatic gain control

[0124] TDRA(field): Time Domain Resource Assignment, time domain resource assignment indication (field)

[0125] FDRA(field): Frequency Domain Resource Assignment, frequency domain resource assignment indication (field)

[0126] ARFCN: Absolute Radio Frequency Channel Number, absolute radio frequency channel number

[0127] SC-FDMA: Single Carrier-Frequency Division Multiple Access, Single Carrier - Frequency Division Multiple Access

[0128] MAC: Medium Access Control, Medium Access Control layer

[0129] PDU: Protocol Data Unit, Protocol Data Unit

[0130] DRX: Discontinuous Reception, Discontinuous Reception

[0131] SL-U: Sidelink unlicensed, Sidelink communication on unlicensed spectrum

[0132] NR-U: NR unlicensed, NR communication on unlicensed spectrum

[0133] LBT: Listen Before Talk, Listen Before Talk

[0134] TBS: Transport Block Size, Transport Block Size

[0135] CQI: Channel Quality Information, Channel Quality Information

[0136] CPE: Cyclic Prefix extension, Cyclic Prefix extension

[0137] COT: Channel Occupancy Time, Channel Occupancy Time

[0138] MCSt: Multiple Consecutive Slots transmission, Multiple Consecutive Slots transmission

[0139] The following is a description of the prior art associated with the solution of the present invention. Unless otherwise specified, the meanings of the same terms in the specific embodiments are the same as those in the prior art.

[0140] It should be noted that V2X in the specification of the present invention has the same meaning as sidelink. V2X in the text can also represent sidelink; similarly, sidelink in the text can also represent V2X, and no specific distinction and limitation will be made hereinafter.

[0141] The resource allocation method and the transmission mode of V2X (sidelink) communication in the specification of the present invention can be equivalently replaced. The resource allocation method involved in the specification can represent the transmission mode, and the transmission mode involved can represent the resource allocation method. In NR sidelink communication, transmission mode 1 represents the transmission mode (resource allocation method) based on base station scheduling; transmission mode 2 represents the transmission mode (resource allocation method) based on user equipment sensing and resource selection.

[0142] The PSCCH in the specification of the present invention is used to carry the SCI. The meanings represented by the PSSCH corresponding to, or corresponding to, or related to, or scheduled by the PSCCH involved in the specification of the present invention are all the same, and all represent the associated PSSCH or the corresponding PSSCH. Similarly, the meanings represented by the SCI (including the first-stage SCI and the second-stage SCI) corresponding to, or corresponding to, or related to the PSSCH involved in the specification are all the same, and all represent the associated SCI or the corresponding SCI. It should be noted that the first-stage SCI is called the 1st stage SCI or SCI format 1-A and is transmitted in the PSCCH; the second-stage SCI is called the 2nd stage SCI or SCI format 2-A (or SCI format 2-B) and is transmitted in the resources of the corresponding PSSCH.

[0143] NR sidelink communication (abbreviated as SL-U) on the unlicensed spectrum in the specification of the present invention can also be referred to as shared spectrum channel access, that is, on the unlicensed spectrum, there may be user equipment accessing the channel through Wifi technology (wireless local area network technology based on the IEEE 802.11 standard), and there are also NR sidelink communication user equipment accessing through the PC5 interface.

[0144] Parameter set (numerology) in NR (including NR sidelink) and Slot

[0145] The parameter set (numerology) includes two aspects: subcarrier spacing and cyclic prefix CP length. Among them, NR supports 5 subcarrier spacings, which are 15k, 30k, 6ok, 120k, 240kHz (corresponding to μ = 0, 1, 2, 3, 4), and Table 4.2-1 shows the supported transmission parameter sets, which are specifically as follows.

[0146] Table 4.2-1 Subcarrier Spacings Supported by NR

[0147] μ <![CDATA[Δf = 2 μ ·15 [kHz]]]> CP (Cyclic Prefix) 0 15 Normal 1 30 Normal 2 60 Normal, Extended 3 120 Normal 4 240 Normal

[0148] Extended CP is supported only when μ = 2, i.e., in the case of a 60 kHz subcarrier spacing. For other subcarrier spacings, only normal CP is supported. For normal CP, each slot contains 14 OFDM symbols; for extended CP, each slot contains 12 OFDM symbols. For μ = 0, i.e., a 15 kHz subcarrier spacing, 1 slot = 1 ms; for μ = 1, i.e., a 30 kHz subcarrier spacing, 1 slot = 0.5 ms; for μ = 2, i.e., a 60 kHz subcarrier spacing, 1 slot = 0.25 ms, and so on.

[0149] NR and LTE have the same definition of a subframe, which is 1 ms. For the subcarrier spacing configuration μ, the slot numbers within 1 subframe (1 ms) can be expressed as ranging from 0 to The slot numbers within 1 system frame (frame, with a duration of 10 ms) can be expressed as ranging from 0 to where and The definitions for different subcarrier spacings μ are shown in the following table.

[0150] Table 4.3.2-1: Number of symbols per slot, number of slots per system frame, number of slots per subframe for normal CP

[0151]

[0152] Table 4.3.2-2: Number of symbols per slot, number of slots per system frame, number of slots per subframe for extended CP (60 kHz)

[0153]

[0154] On an NR carrier, the system frame (or simply referred to as the frame) number SFN ranges from 0 to 1023. In sidelink communication, the concept of a direct system frame number DFN is introduced, with a number range also from 0 to 1023. The above description of the relationship between the system frame and the numerology can also be applied to the direct system frame. For example, the duration of a direct system frame is also equal to 10 ms. For a 15 kHz subcarrier spacing, a direct system frame includes 10 slots, and so on. DFN is applied to the timing on the sidelink carrier.

[0155] Resource Block RB and Resource Element RE

[0156] A resource block RB is defined in the frequency domain as A number of consecutive subcarriers. For example, for a subcarrier spacing of 15 kHz, the RB is 180 kHz in the frequency domain. For a subcarrier spacing of 15 kHz × 2 μ , a resource element RE represents 1 subcarrier in the frequency domain and 1 OFDM symbol in the time domain.

[0157] Sidelink communication scenario

[0158] 1) Out-of-Coverage sidelink communication: Neither of the two UEs performing sidelink communication has network coverage (for example, if a UE cannot detect any cell that meets the "cell selection criterion" on the frequency for which sidelink communication is required, it means the UE has no network coverage).

[0159] 2) In-Coverage sidelink communication: Both of the two UEs performing sidelink communication have network coverage (for example, if a UE can detect at least one cell that meets the "cell selection criterion" on the frequency for which sidelink communication is required, it means the UE has network coverage).

[0160] 3) Partial-Coverage sidelink communication: One of the UEs performing sidelink communication has no network coverage while the other has network coverage.

[0161] From the UE side, there are only two scenarios for the UE: having no network coverage and having network coverage. Partial coverage is described from the perspective of sidelink communication.

[0162] Sidelink resource pool

[0163] In sidelink communication, the resources for UE transmission and reception both belong to a resource pool. For example, for the transmission mode based on base station scheduling in sidelink communication, the base station schedules transmission resources for sidelink UEs in the resource pool, or, for the transmission mode based on UE sensing in sidelink communication, the UE determines transmission resources in the resource pool.

[0164] For NR sidelink communication, resource allocation based on sub-channels is supported as the smallest granularity in the frequency domain, that is, for PSSCH transmission, the resources occupied in the frequency domain are an integer number of sub-channels. A sub-channel can represent a number of consecutive resource blocks RB in the frequency domain.

[0165] Perception-based resource allocation method

[0166] For the perception-based resource allocation method (resource allocation method 2), the sidelink communication user equipment selects candidate resources within a time window (optionally, the resource selection window [n+T1, n+T2]), and determines the candidate resources that overlap with the reserved resources indicated by the PSCCH sent by other user equipment in the listening time slot, and excludes these overlapping candidate resources. The physical layer reports the set of candidate resources not excluded to the MAC layer, and the MAC layer selects transmission resources for the PSSCH / PSCCH. The set of transmission resources selected by the MAC layer is called the selected sidelink grant. The sidelink communication resources included in a selected sidelink grant can be used for the initial transmission and all retransmissions of a MAC PDU (corresponding to a transport block TB), or can be used for the initial transmission and all retransmissions of multiple MAC PDUs (corresponding to multiple transport blocks TB). The present invention does not impose any restrictions on this.

[0167] The partial perception-based resource allocation method means that the time slots listened to by the user equipment are discontinuous (or discrete) in the listening window, so it is called partial sensing.

[0168] Resource selection window [n+T1, n+T2] [[ID=⑧]]

[0169] In the perception-based (or partial perception-based) resource allocation method, the higher layer requests or triggers the physical layer to determine the resources for PSSCH / PSCCH transmission (perform perception or partial perception) at time slot n. The resource selection window is defined as [n+T1, n+T2], that is, the user equipment selects transmission resources within this window. Among them, T1 satisfies the condition The selection of T1 depends on the implementation of the user equipment; the RRC configuration information contains a configuration list sl-Selection WindowList of the resource selection window, where the element corresponding to a given priority prio TX (the priority of transmitting the PSSCH) is represented as T 2min . If this T 2min is less than the remaining packet delay budget (abbreviated as remaining PDB), then T2 satisfies the condition T 2min ≤T2≤remaining PDB, and the selection of T2 depends on the implementation of the user equipment; otherwise T2 is set to remaining PDB. is defined as follows (μ SL represents the subcarrier spacing parameter of sidelink communication, that is, the subcarrier spacing is ):

[0170] Table 8.1.4-2: Value of

[0171]

[0172] Table 8.1.4-1: Value of

[0173]

[0174] LBT (Listen Before Talk) mechanism

[0175] For wireless communications on unlicensed spectrum, some countries or regions (e.g., European regions) stipulate that user equipment needs to perform LBT operation, i.e., the "listen before talk" mechanism, also known as channel access operation, which is a mechanism to determine channel availability by sensing the channel before wireless communication transmission. Specifically, within a period of time before communication transmission, user equipment will only transmit when it detects that the channel is idle; otherwise, user equipment will not transmit.

[0176] Specifically, for NR communication (NR-U) on unlicensed spectrum (or, for SL-U), the basic time unit for sensing the channel can be T sl = 9 μs. If the energy detected by the base station or user equipment on the channel within this time unit is lower than the energy threshold X Thresh and the duration is equal to or exceeds 4 μs, then the base station or user equipment considers the channel to be idle within this time unit (or, called LBT success). It should be noted that the channel on which the base station or user equipment detects energy and uses it to determine whether it is idle represents a carrier containing a set of consecutive resource blocks RB, or a part of the carrier. This channel can also be called LBT bandwidth (LBT bandwidth), or, LBT sub-band (LBT sub-band), or RB set (RB set). An LBT bandwidth or RB set can be equal to 20 MHz in the frequency domain, that is, there can be an RB set on a 20 MHz carrier. The number of resource blocks RB corresponding to the multiple RB sets contained in a carrier (a carrier exceeding 20 MHz, such as 40 MHz, 60 MHz, 80 MHz) and the intra-cell Guard Band (GB for short) between two consecutive RB sets can be as shown in the following table:

[0177] Table 1: Number of RBs in all RB sets and GB on one carrier at 15 kHz and 30 kHz subcarrier spacings

[0178]

[0179] In the above table, taking the subcarrier spacing of 15 kHz and the carrier bandwidth of 40 MHz as an example, 105-6-105 means that this carrier contains two consecutive RB sets, each containing 105 RBs. Between these two RB sets, there is a guard band GB containing 6 consecutive RBs, for a total of 216 consecutive RBs, and so on for other items in Table 1.

[0180] It should be noted that the LBT operations performed by the (sidelink communication) user equipment on different RB sets can be independent of each other (i.e., they have nothing to do with each other). For example, the user equipment detects that the channel is idle on RB set 1, and the channel detected on RB set 2 can be occupied (or, busy). If the resources selected by the sidelink communication user equipment for transmitting PSSCH / PSCCH contain (all or part of) the RBs corresponding to both RB set 1 and RB set 2, then and only then when the user equipment detects that the channel is idle on both RB set 1 and RB set 2, can the user equipment send the corresponding PSSCH / PSCCH.

[0181] MCSt (Multiple Consecutive Slots transmission) Multiple consecutive slot transmission

[0182] For wireless communication on unlicensed spectrum, it supports the user equipment to perform transmissions on multiple consecutive time slots, simply referred to as MCSt. Since the user equipment performs transmissions on consecutive time slots, other user equipment (e.g., user equipment of WiFi) considers the current channel to be busy (not idle), which can effectively reduce the frequency (number of times, or, demand) of channel access (i.e., LBT) of this user equipment and increase the transmission efficiency. In the specification of the present invention, N slot，MCSt is used to represent the number of time slots of multiple consecutive time slots in the time domain.

[0183] Candidate multi-slot resource

[0184] When the MAC layer provides a value of N greater than 1 to the physical layer slot，MCSt the physical layer uses candidate multi-time slot resources; otherwise, it uses candidate single-time slot resources. A candidate multi-time slot resource includes N slot，MCSt consecutive time slots in the time domain.

[0185] Hereinafter, specific examples, embodiments, etc. related to the present invention will be described in detail. In addition, as described above, the examples and embodiments described in this disclosure are exemplary descriptions for facilitating the understanding of the present invention and do not limit the present invention.

[0186] [Embodiment 1]

[0187] Figure 1 It is a schematic diagram showing the basic process of the method executed by the user equipment in Embodiment 1 of the present invention.

[0188] Next, in combination with Figure 1 the shown basic process diagram, the method executed by the user equipment in Embodiment 1 of the present invention will be described in detail.

[0189] As Figure 1 shown, in Embodiment 1 of the present invention, the steps executed by the user equipment include:

[0190] In step S101, on the unlicensed spectrum (or, on the shared spectrum), the sidelink communication user equipment receives sidelink communication control information SCI and physical sidelink shared channel PSSCH.

[0191] Optionally, the resource allocation mode of the sidelink communication is configured as a resource allocation mode based on consecutive resource blocks RB.

[0192] Optionally, the SCI indicates that the PSSCH is allocated M sub-channels in the frequency domain. Optionally, M is greater than 1.

[0193] Optionally, the sub-channel with the highest number among the M sub-channels overlaps with a single resource block set and intra-cell guard band physical resource blocks,

[0194] or, the sub-channel with the highest number among the M sub-channels completely coincides with the intra-cell guard band physical resource blocks (or, the sub-channel with the highest number among the M sub-channels is completely located in the intra-cell guard band physical resource blocks), and / or, the sub-channel with the second highest number among the M sub-channels overlaps with a single resource block set and / or intra-cell guard band physical resource blocks,

[0195] or, the resource block RB with the highest number among the sub-channels with the highest number among the M sub-channels overlaps with the intra-cell guard band physical resource blocks.

[0196] In step S102, the user equipment determines the physical resource blocks PRB allocated (or, scheduled) by the PSSCH.

[0197] Among them, the physical resource blocks allocated for the PSSCH include the physical resource blocks on the allocated M sub-channels, excluding the physical resource blocks in the in-cell guard bands of the sub-channel (one or more) with the highest number and / or the sub-channel with the second highest number among the M sub-channels.

[0198] [Embodiment 2]

[0199] Figure 2 It is a schematic diagram showing the basic process of the method performed by a user equipment according to Embodiment 2 of the present invention.

[0200] Next, in combination with Figure 2 the basic process diagram shown below, the method performed by a user equipment according to Embodiment 2 of the present invention will be described in detail.

[0201] As Figure 2 shown, in Embodiment 2 of the present invention, the steps performed by the user equipment include:

[0202] In step S201, the sidelink communication user equipment selects to generate a selected sidelink grant, and optionally, sidelink communication data is available on the logical channel.

[0203] Among them, optionally, the selected sidelink grant corresponds to the transmission of one or more MAC protocol data units (PDUs).

[0204] In step S202, the user equipment performs a transmission resource selection (reselection) process.

[0205] Among them, optionally, the user equipment selects time-frequency resources from the resource set indicated by the physical layer for the first transmission opportunity.

[0206] And, optionally, if the user equipment selects one or more HARQ retransmissions, then the user equipment selects time-frequency resources from the available resource set indicated by the physical layer for one or more second transmission opportunities.

[0207] In step S203, the user equipment determines the initial transmission opportunity and the retransmission opportunity of the selected sidelink grant.

[0208] Optionally, the user equipment uses the time-frequency resource on the first time slot in the first transmission opportunity in the time domain as the initial transmission opportunity, and,

[0209] Optionally, the user equipment uses the other (or remaining) time-frequency resources (if any) in the first transmission opportunity in the time domain and / or other transmission opportunities (if any) excluding the first transmission opportunity in the time domain from the first transmission opportunity and the one or more second transmission opportunities as the retransmission transmission opportunity.

[0210] Figure 3 is a block diagram showing a user equipment UE involved in the present invention. As Figure 3 shown, the user equipment UE30 includes a processor 301 and a memory 302. The processor 301 may include, for example, a microprocessor, a microcontroller, an embedded processor, etc. The memory 302 may include, for example, a volatile memory (such as a random access memory RAM), a hard disk drive (HDD), a non-volatile memory (such as a flash memory), or other memories, etc. Program instructions are stored on the memory 302. When executed by the processor 301, these instructions can perform the above methods executed by the user equipment described in detail in the present invention.

[0211] The methods and the devices involved in the present invention have been described above in conjunction with preferred embodiments. Those skilled in the art can understand that the methods shown above are merely exemplary, and the above-described embodiments can be combined with each other without contradiction. The methods of the present invention are not limited to the steps and sequences shown above. The network nodes and user equipment shown above may include more modules. For example, they may also include modules that can be developed or will be developed and can be used for base stations, MMEs, or UEs, etc. The various identifiers shown above are merely exemplary and not restrictive. The present invention is not limited to the specific cells that are examples of these identifiers. Those skilled in the art can make many changes and modifications according to the teachings of the shown embodiments.

[0212] It should be understood that the above embodiments of the present invention can be implemented by software, hardware, or a combination of software and hardware. For example, various components inside the base station and the user equipment in the above embodiments can be implemented by a variety of devices, including but not limited to: analog circuit devices, digital circuit devices, digital signal processing (DSP) circuits, programmable processors, application specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), programmable logic devices (CPLDs), and so on.

[0213] In the present application, a "base station" may refer to a mobile communication data and control switching center with a relatively large transmission power and a relatively wide coverage area, including functions such as resource allocation and scheduling, data reception and transmission, etc. A "user equipment" may refer to a user mobile terminal, for example, including a mobile phone, a notebook, etc., which are terminal devices capable of wireless communication with a base station or a micro base station.

[0214] In addition, the embodiments of the present invention disclosed herein can be implemented on a computer program product. More specifically, the computer program product is a product as follows: having a computer-readable medium, on which computer program logic is encoded, and when executed on a computing device, the computer program logic provides relevant operations to implement the above technical solutions of the present invention. When executed on at least one processor of a computing system, the computer program logic causes the processor to execute the operations (methods) described in the embodiments of the present invention. Such a setting of the present invention is typically provided as software, code, and / or other data structures set or encoded on a computer-readable medium such as an optical medium (e.g., CD-ROM), a floppy disk, or a hard disk, or other media such as firmware or microcode on one or more ROMs or RAMs or PROM chips, or a downloadable software image in one or more modules, a shared database, etc. The software or firmware or such a configuration can be installed on a computing device so that one or more processors in the computing device execute the technical solutions described in the embodiments of the present invention.

[0215] In addition, each functional module or each feature of the base station device and the terminal device used in each of the above embodiments can be implemented or executed by a circuit, and the circuit is usually one or more integrated circuits. The circuit designed to execute each function described in this specification may include a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), or a general integrated circuit, a field-programmable gate array (FPGA), or other programmable logic devices, discrete gates or transistor logic, or discrete hardware components, or any combination of the above devices. The general-purpose processor may be a microprocessor, or the processor may be an existing processor, controller, microcontroller, or state machine. The above general-purpose processor or each circuit may be configured by a digital circuit or may be configured by a logic circuit. In addition, when an advanced technology capable of replacing the current integrated circuit appears due to the progress of semiconductor technology, the present invention can also use the integrated circuit obtained by using this advanced technology.

[0216] Although the present invention has been shown above in connection with the preferred embodiments of the present invention, those skilled in the art will understand that various modifications, substitutions, and changes can be made to the present invention without departing from the spirit and scope of the present invention. Therefore, the present invention should not be limited by the above embodiments, but should be defined by the appended claims and their equivalents.

Claims

1. A method performed by a user equipment, comprising the following steps: Receiving sidelink communication control information SCI and a physical sidelink shared channel PSSCH on an unlicensed spectrum; And Determining physical resource blocks allocated for the PSSCH according to the received SCI and PSSCH.

2. The method according to claim 1, wherein The resource allocation mode of the sidelink communication is configured as a resource allocation mode based on consecutive resource blocks RB.

3. The method according to claim 1, wherein The SCI indicates that M sub-channels are allocated for the PSSCH in the frequency domain, where M is greater than 1.

4. The method according to claim 3, wherein The sub-channel with the highest number among the M sub-channels overlaps with a single resource block set and physical resource blocks in the intra-cell guard band; or The sub-channel with the highest number among the M sub-channels completely coincides with the physical resource blocks in the intra-cell guard band, and / or, the sub-channel with the second highest number among the M sub-channels overlaps with a single resource block set and / or physical resource blocks in the intra-cell guard band; or The resource block RB with the highest number among the sub-channels with the highest number among the M sub-channels overlaps with the physical resource blocks in the intra-cell guard band.

5. The method according to claim 4, wherein The physical resource blocks allocated for the PSSCH include physical resource blocks on the allocated M sub-channels, excluding the physical resource blocks in the intra-cell guard band of the sub-channel with the highest number and / or the sub-channel with the second highest number among the M sub-channels.

6. A method performed by a user equipment, comprising the following steps: Selecting and generating a selected sidelink communication scheduling grant on an unlicensed spectrum; Performing a transmission resource selection or reselection process for the selected sidelink communication scheduling grant; and Determining an initial transmission opportunity and a retransmission opportunity for the selected sidelink communication scheduling grant.

7. The method according to claim 6, wherein The selected sidelink communication scheduling grant corresponds to the transmission of one or more MAC protocol data units PDU.

8. The method according to claim 6, wherein The step of performing a transmission resource selection or reselection process includes: Selecting time-frequency resources from a resource set indicated by the physical layer for a first transmission opportunity; and If one or more HARQ retransmissions are selected, selecting time-frequency resources from the available resource set indicated by the physical layer for one or more second transmission opportunities.

9. The method according to claim 6, wherein The step of determining an initial transmission opportunity and a retransmission opportunity for the selected sidelink communication scheduling grant includes: Taking the time-frequency resources on the first time slot in the first transmission opportunity in the time domain as the initial transmission opportunity; and Taking the other time-frequency resources in the first transmission opportunity in the time domain and / or other transmission opportunities as the retransmission opportunity.

10. A user equipment, comprising: A processor; And A memory storing instructions, Wherein the instructions, when run by the processor, execute the method according to any one of claims 1-9.

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