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 of: selecting and generating a selected sidewalk communication scheduling permission on an unlicensed spectrum; and performing a transmit resource selection or reselection procedure for the one selected sidewalk communication scheduling grant.

Description

Technical Field

[0001] The present invention relates to the technical field of wireless communications, and in particular to a method executed by a user equipment and corresponding user equipment. Background Art

[0002] In traditional cellular networks, all communications must go through base stations. In contrast, D2D communication (Device-to-Device communication) refers to the direct communication between two user devices without forwarding through a base station or core network. At the RAN#63 plenary meeting of the 3rd Generation Partnership Project (3GPP) in March 2014, a research project on using LTE devices to implement proximity D2D communication services was approved (see non-patent document 1). The features introduced by LTE Release 12 D2D include:

[0003] 1) Discovery function between nearby devices in LTE network coverage scenarios;

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

[0005] 3) The upper layer supports unicast and multicast communication functions.

[0006] At the 3GPP RAN#66 plenary meeting in December 2014, the research project of enhanced LTE eD2D was approved (see non-patent document 2). The main functions introduced by LTE Release 13 eD2D include:

[0007] 1) D2D discovery in scenarios with no network coverage and partial network coverage;

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

[0009] Based on the design of D2D communication mechanism, the feasibility study of V2X based on D2D communication was approved at the RAN#68 plenary meeting of 3GPP in June 2015. V2X stands for Vehicle to Everything, which hopes to achieve information exchange between vehicles and all entities that may affect vehicles, with the aim of reducing accidents, easing traffic congestion, reducing environmental pollution and providing other information services. The application scenarios of V2X mainly include four aspects:

[0010] 1) V2V, Vehicle to Vehicle, i.e. vehicle-to-vehicle communication;

[0011] 2) V2P, Vehicle to Pedestrian, that is, the vehicle sends warnings to pedestrians or non-motor vehicles;

[0012] 3) V2N, Vehicle to Network, that is, vehicles connected to mobile networks;

[0013] 4) V2I, Vehicle to Infrastructure, refers to the communication between vehicles and road infrastructure.

[0014] 3GPP divides the research and standardization of V2X into three stages. The first stage was completed in September 2016, focusing mainly on V2V, based on LTE Release 12 and Release 13 D2D (also known as side communication), that is, 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 networks in high-speed (up to 250 km / h) and high-node density environments. Vehicles can exchange 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) Introducing sub-channels to enhance resource allocation;

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

[0018] The second phase of the V2X research project falls within the scope of LTE Release 15 research (see non-patent document 4). The main features introduced include high-order 64QAM modulation, V2X carrier aggregation, short TTI transmission, and feasibility study of transmit diversity.

[0019] At the 3GPP RAN#80 plenary meeting in June 2018, the corresponding third phase V2X feasibility study project based on 5G NR network technology (see non-patent document 5) was approved.

[0020] In the 5G NR V2X topic, a resource allocation mode 2 based on user equipment sensing is supported, or transmission mode 2. For resource allocation mode 2 based on user equipment sensing, the physical layer of the user equipment senses the transmission resources in the resource pool, indicating that the user equipment determines whether to exclude resources in the candidate resource set that overlap with the resources indicated by the above indication information based on the indication information in the SCI received from other user equipments. The resources in the candidate resource set that are not excluded are reported to the upper layer, and the upper layer randomly selects resources for PSSCH / PSCCH transmission from the reported resource set.

[0021] At the 3GPP RAN#95e plenary meeting in March 2022, a standardization research topic based on the evolution of the already standardized NR sidelink communication (NR sidelink evolution, referred to as NR SL evo) (see non-patent document 6) was approved. The research objectives of NR SL evo include the following aspects:

[0022] 1) Research and standardize NR sideline communication on unlicensed spectrum, referred to as SL-U. SL-U includes both resource allocation method 1 and resource allocation method 2 for NR sideline communication. The research project specifically includes:

[0023] a. In SL-U, the channel access technology and operation of NR air interface in unlicensed spectrum communication (NR unlicensed, referred to as NR-U) are reused. The channel access technology of NR-U refers to the Listen Before Talk (LBT) technology, which means "listen before talking", which means that the user equipment needs to listen to the channel resources used for transmission before transmission. If the channel is idle, transmission is carried out; otherwise, transmission is abandoned.

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

[0025] The disclosed solution includes a method for performing random resource selection in SL-U, and determining a second level SCI (2 nd A method for determining the number of coded modulation symbols of stage SCI.

[0026] Prior art literature

[0027] Non-patent literature

[0028] Non-patent literature 1: RP-140518, Work item proposal on LTE Device to DeviceProximity Services

[0029] Non-Patent Literature 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 Literature 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] In order to solve at least a part of the above problems, the present invention provides a method executed by a user equipment and a user equipment, which can improve the communication reliability of sidelink communication on an unlicensed spectrum.

[0035] According to the present invention, a method executed by a user equipment is proposed, comprising the following steps: selecting to generate a selected sideline communication scheduling permit on an unlicensed spectrum; and executing a sending resource selection or reselection process for the selected sideline communication scheduling permit.

[0036] Preferably, the one selected sideline communication scheduling permission corresponds to the transmission of one or more MAC protocol data units PDU.

[0037] Preferably, the step of executing the transmission resource selection or reselection process comprises: a random selection process of randomly selecting time-frequency resources from a resource pool.

[0038] Preferably, the random selection process excludes one or more candidate resources, wherein the one or more candidate resources represent candidate resources including a guard band resource block within the cell in the subchannel with the smallest number, or represent candidate resources whose associated one or more resource block sets are included in the resource block set corresponding to the "continuous listen-before-speak failure" indicated by the upper layer.

[0039] Preferably, the step of executing the transmission resource selection or reselection process includes: randomly selecting time-frequency resources from a set of candidate resources indicated or reported by the physical layer.

[0040] Preferably, one or more candidate resources are excluded from the candidate resource set indicated or reported by the physical layer, and the one or more candidate resources represent candidate resources including the protection band resource blocks within the cell in the subchannel with the smallest number, or represent candidate resources included in the associated one or more resource block sets in the resource block set corresponding to the "continuous listen-before-speak failure" indicated by the upper layer.

[0041] Furthermore, according to the present invention, a method performed by a user equipment is proposed, comprising the following steps: determining the number of coded modulation symbols of a second-level SCI on an unlicensed spectrum; and receiving a first-level SCI and the second-level SCI.

[0042] Preferably, the number of coded modulation symbols is determined by at least a parameter indicating the number of resource blocks RBs or bandwidth allocated or scheduled for PSSCH transmission.

[0043] Preferably, the calculation method of the number of RBs is different based on whether the high-level RRC configuration is based on resource allocation based on interleaved resource blocks or based on resource allocation based on continuous resource blocks.

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

[0045] Effects of the Invention

[0046] In SL-U, the scheme of the present invention describes that when the media access control layer MAC layer performs random resource selection, it is necessary to exclude some candidate resources first. The subchannel with the smallest number of these excluded candidate resources overlaps with the (intra-cell) guardband resource block, or the resource block set (RBset) associated with these excluded candidate resources is included in the resource block set corresponding to the "Continuous Listen Before Talk Failure (C-LBT Failure)" indicated by the upper layer. This scheme ensures that the resources selected by the MAC layer in random resource selection can be used to transmit PSCCH, and that channel access will not be lost due to C-LBT Failure, thereby improving the communication reliability of sidelink communication on unlicensed spectrum. At the same time, for a transmission block TB, the solution of the present invention also ensures that the number of coded modulation symbols of the second-level SCI of the initial transmission and retransmission (or, between different retransmissions) of the TB is the same, thereby ensuring that the transmission block size TBS of the initial transmission and retransmission (or, between different retransmissions) of the TB is the same, so that the receiving user equipment can combine and decode the initial transmission and retransmission (or, different retransmissions), which also improves the reliability of sidelink communications on the unlicensed spectrum. BRIEF DESCRIPTION OF THE DRAWINGS

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

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

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

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

[0051] The present invention is 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, detailed descriptions of known technologies that are not directly related to the present invention are omitted to prevent confusion in understanding the present invention.

[0052] The following uses the 5G mobile communication system and its subsequent evolution versions as example application environments to specifically describe multiple embodiments of 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.

[0053] The following describes some of the terms involved in the present invention. Unless otherwise specified, the terms involved in the present invention are defined herein. The terms given in the present invention may be named differently in LTE, LTE-Advanced, LTE-Advanced Pro, NR and subsequent communication systems, but unified terms are used in the present invention, and when applied to a specific system, they can be replaced by the terms used in the corresponding system.

[0054] 3GPP: 3rd Generation Partnership Project

[0055] LTE: Long Term Evolution

[0056] NR: New Radio

[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

[0061] eNB: evolved NodeB

[0062] gNB: NR base station

[0063] TTI: Transmission Time Interval, transmission time interval

[0064] OFDM: Orthogonal Frequency Division Multiplexing

[0065] CP-OFDM: Cyclic Prefix Orthogonal Frequency Division Multiplexing, orthogonal frequency division multiplexing with cyclic prefix

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

[0067] CSI: Channel State Information

[0068] HARQ: Hybrid Automatic Repeat Request

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

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

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

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

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

[0074] CG: Configured Grant, configuration scheduling permission

[0075] Sidelink: Sidelink communication

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

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

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

[0079] RB: Resource Block

[0080] RE:Resource Element

[0081] CRB: Common Resource Block

[0082] CP: Cyclic Prefix

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

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

[0085] FDM: Frequency Division Multiplexing

[0086] RRC: Radio Resource Control

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

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

[0089] DMRS: Demodulation Reference Signal

[0090] CRC: Cyclic Redundancy Check

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

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

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

[0094] TDD: Time Division Duplexing

[0095] FDD: Frequency Division Duplexing

[0096] SIB: System Information Block

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

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

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

[0100] SSSS: Secondary Sidelink Synchronization Signal, sideline communication auxiliary synchronization signal

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

[0102] PSS: Primary Synchronization Signal

[0103] SSS: Secondary Synchronization Signal, auxiliary synchronization signal

[0104] BWP: BandWidth Part, bandwidth fragment / part

[0105] GNSS: Global Navigation Satellite System

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

[0107] DFN: Direct Frame Number, direct frame number

[0108] IE: Information Element

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

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

[0111] MCG: Master Cell Group

[0112] SCG: Secondary Cell Group

[0113] PCell: Primary Cell

[0114] SCell: Secondary Cell

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

[0116] SPS: Semi-Persistant Scheduling

[0117] TA: Timing Advance, uplink timing advance

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

[0119] TB: Transport Block

[0120] CB: Code Block, coding block / code block

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

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

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

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

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

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

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

[0128] MAC: Medium Access Control

[0129] PDU: Protocol Data Unit

[0130] DRX: 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

[0134] TBS: Transport Block Size, transport block size

[0135] CQI: Channel Quality Information

[0136] CPE: Cyclic Prefix extension

[0137] COT: Channel Occupancy Time, channel occupancy time

[0138] MCSt:Multiple Consecutive Slots transmission, multiple continuous time slot 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 and the prior art are the same.

[0140] It is worth pointing out that V2X and sidelink mentioned in the specification of the present invention have the same meaning. V2X in the text can also mean sidelink; similarly, sidelink in the text can also mean V2X, and no specific distinction or limitation will be made in the following text.

[0141] The resource allocation method of V2X (sidelink) communication in the specification of the present invention can be equivalently replaced with the transmission mode of V2X (sidelink) communication. 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 side communication, transmission mode 1 represents a transmission mode (resource allocation method) based on base station scheduling; transmission mode 2 represents a 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 SCI. The PSCCH corresponding to, or, corresponding to, or, related to, or scheduled PSSCH involved in the specification of the present invention have the same meaning, all indicating associated PSSCH or corresponding PSSCH. Similarly, the SCI (including first-level SCI and second-level SCI) corresponding to, or, corresponding to, or related to the PSSCH involved in the specification have the same meaning, all indicating associated SCI or corresponding SCI. It is worth pointing out that the first-level SCI is called 1st stage SCI or SCI format 1-A, which is transmitted in PSCCH; the second-level SCI is called 2nd stage SCI or SCI format 2-A (or, SCI format 2-B), which is transmitted in the corresponding PSSCH resources.

[0143] The NR side communication (SL-U for short) on the unlicensed spectrum in the specification of the present invention may also be referred to as shared spectrum channel access, that is, on the unlicensed spectrum, there may be user devices that access the channel through Wifi technology (wireless LAN technology based on IEEE 802.11 standard), and there may also be NR side communication user devices that access the channel through the PC5 interface.

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

[0145] The parameter set (numerology) includes two meanings: subcarrier spacing and cyclic prefix CP length. Among them, NR supports 5 subcarrier spacings, namely 15k, 30k, 60k, 120k, and 240kHz (corresponding to μ=0, 1, 2, 3, and 4). Table 4.2-1 shows the supported transmission parameter sets, as shown below.

[0146] Table 4.2-1 Subcarrier spacing 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] Only when μ=2, that is, when the subcarrier spacing is 60kHz, the Extended CP is supported. For other subcarrier spacings, only the Normal CP is supported. For the Normal CP, each slot contains 14 OFDM symbols; for the Extended CP, each slot contains 12 OFDM symbols. For μ=0, that is, 15kHz subcarrier spacing, 1 slot = 1ms; μ=1, that is, 30kHz subcarrier spacing, 1 slot = 0.5ms; μ=2, that is, 60kHz subcarrier spacing, 1 slot = 0.25ms, and so on.

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

[0150] Table 4.3.2-1: Number of symbols in each time slot, number of time slots in each system frame, number of time slots in each subframe under normal CP

[0151]

[0152] Table 4.3.2-2: Number of symbols in each time slot, number of time slots in each system frame, number of time slots in each subframe when using extended CP (60kHz)

[0153]

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

[0155] Resource Block RB and Resource Unit RE

[0156] Resource blocks RB are defined in the frequency domain as For example, for a subcarrier spacing of 15kHz, the RB is 180kHz in the frequency domain. μ , the resource unit RE represents 1 subcarrier in the frequency domain and 1 OFDM symbol in the time domain.

[0157] Sideline communication scenario

[0158] 1) Out-of-Coverage side communication: Both UEs performing side communication have no network coverage (for example, the UE cannot detect any cell that meets the "cell selection criteria" on the frequency required for side communication, indicating that the UE has no network coverage).

[0159] 2) Sidewalk communication with network coverage (In-Coverage): Both UEs performing sidewalk communication have network coverage (for example, the UE detects at least one cell that meets the "cell selection criteria" on the frequency required for sidewalk communication, indicating that the UE has network coverage).

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

[0161] From the UE side, the UE has only two scenarios: no network coverage and network coverage. Partial network coverage is described from the perspective of sideline communication.

[0162] Sidelink resource pool

[0163] In sidewalk communication, the resources sent and received by the UE belong to a resource pool. For example, for a transmission mode based on base station scheduling in sidewalk communication, the base station schedules transmission resources for the sidewalk UE in the resource pool, or, for a transmission mode based on UE perception in sidewalk communication, the UE determines the transmission resources in the resource pool.

[0164] For NR sideline communications, the frequency domain supports resource allocation based on sub-channels as the minimum granularity, that is, for PSSCH transmission, the resources occupied in the frequency domain are an integer number of sub-channels. A sub-channel can represent several consecutive resource blocks RBs in the frequency domain.

[0165] Resource allocation based on perception

[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, a resource selection window [n+T1, n+T2]), and determines the candidate resources that overlap with the reserved resources based on the reserved resources indicated by the PSCCH sent by other user equipment in the monitoring time slot, and excludes these overlapping candidate resources. The physical layer reports the set of candidate resources that are 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 a selected sidelink grant. The sidelink communication resources contained in a selected sidelink grant can be used for the initial transmission and all retransmissions of a MAC PDU (corresponding to a transmission block TB), or can be used for the initial transmission and all retransmissions of multiple MAC PDUs (corresponding to multiple transmission blocks TB). The present invention does not impose any restrictions on this.

[0167] The partial sensing resource allocation method means that the time slots monitored by the user equipment are discontinuous (or discrete) in the monitoring window, so it is called partial sensing.

[0168] Resource selection window [n+T1, n+T2]

[0169] In the resource allocation method based on sensing (or partial sensing), the upper layer requests or triggers the physical layer to determine the resources for PSSCH / PSCCH transmission (perform sensing or partial sensing) in time slot n. The resource selection window is defined as [n+T1, n+T2], that is, the user equipment selects the 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 of resource selection windows sl-Selection WindowList, where the list corresponds to a given priority prio TX The element of (priority of transmitting PSSCH) is represented by T 2min If the T 2min is less than the remaining packet delay budget (remaining packet delaybudget, referred to as remaining PDB), then T2 satisfies the condition T 2min ≤T2≤remaining PDB, the selection of T2 depends on the implementation of the user equipment; otherwise T2 is set to remaining PDB. The definition of is as follows (μ SL Indicates the subcarrier spacing parameter of sideline communication, that is, the subcarrier spacing is ):

[0170] Table 8.1.4-2: The value of

[0171]

[0172] Table 8.1.4-1: The value of

[0173]

[0174]

[0175] LBT (Listen Before Talk) mechanism

[0176] For wireless communications on unlicensed spectrum, some countries or regions (for example, Europe) stipulate that user equipment must perform LBT operation before transmitting wireless communications, which is a "listen before talk" mechanism, also known as channel access operation, which means a mechanism to determine channel availability by sensing the channel. Specifically, during a period of time before communication transmission, the user equipment will only transmit when it detects that the channel is idle; otherwise, the user equipment will not transmit.

[0177] Specifically, for NR communication over unlicensed spectrum (NR-U) (or, for SL-U), the basic time unit for sensing the channel can be T sl =9μs. In this time unit, if the energy detected by the base station or user equipment on the channel is lower than the energy threshold value X Thresh When the duration is equal to or greater than 4μs, the base station or user equipment considers that the channel is idle within the time unit (or, it is called LBT success). It is worth noting that the channel (channel) that the base station or user equipment detects energy and uses to determine whether it is idle represents a carrier containing a continuous resource block RB set, or a part of the carrier. The channel can also be called LBT bandwidth (LBTbandwidth), or LBT sub-band (LBT sub-band), or RB set (RB set). An LBT bandwidth or RB set can be equal to 20MHz in the frequency domain, that is, there can be an RB set on a 20MHz carrier. The number of resource blocks RBs corresponding to multiple RB sets contained in a carrier (carriers exceeding 20MHz, such as 40MHz, 60MHz, 80MHz) and the guard band (Guard Band, referred to as GB) between two continuous RB sets can be as shown in the following table:

[0178] Table 1: All RB sets on a carrier and the number of RBs contained in a GB at 15kHz and 30kHz subcarrier spacing

[0179]

[0180] In the figure above, taking the subcarrier spacing of 15kHz and the carrier bandwidth of 40MHz as an example, 105-6-105 indicates that the carrier contains two consecutive RB sets, each containing 105 RBs. Between the two RB sets, there is a guard band GB containing 6 consecutive RBs, which contains a total of 216 consecutive RBs, and so on for other items in Table 1.

[0181] It is worth pointing out that the LBT operations performed by the (sideline communication) user equipment on different RB sets may be independent of each other (i.e., the two are unrelated). For example, the user equipment detects that the channel is idle on RB set 1, and the channel is occupied (or busy) on RB set 2. If the resources selected by the sideline communication user equipment for transmitting PSSCH / PSCCH include (all or part of) RBs corresponding to RB set 1 and RB set 2, the user equipment may send the corresponding PSSCH / PSCCH if and only if the user equipment detects that the channel is idle on both RB set 1 and RB set 2.

[0182] Hereinafter, specific examples and embodiments of the present invention will be described in detail. As described above, the examples and embodiments described in the present disclosure are provided for easy understanding of the present invention and are not intended to limit the present invention.

[0183] [Example 1]

[0184] Figure 1 It is a schematic diagram showing the basic process of the method executed by the user equipment according to the first embodiment of the present invention.

[0185] Next, combine Figure 1 The basic process diagram shown is used to describe in detail the method executed by the user equipment according to the first embodiment of the present invention.

[0186] like Figure 1 As shown, in the first embodiment of the present invention, the steps performed by the user equipment include:

[0187] In step S101, on an unlicensed spectrum (or, on a shared spectrum), a sidelink user equipment selects to generate a selected sidelink grant, and, optionally, on a logical channel, sidelink data is available.

[0188] Optionally, the selected sideline communication scheduling permission corresponds to the transmission of one or more MAC protocol data units PDU.

[0189] Optionally, the upper layer configures the resource allocation mode of the user equipment to be random resource selection (or, random selection).

[0190] In step S102, the user equipment performs a transmission resource selection (or reselection) process.

[0191] Optionally, the user equipment randomly selects time-frequency resources from a resource pool. Optionally, the random selection process excludes one or more candidate resources. The one or more candidate resources represent candidate resources including (intra-cell) guardband (GB) resource blocks in the subchannel with the smallest number (optionally, a high-level RRC parameter is set to allocate resources based on continuous RBs), or represent candidate resources in a resource block set of the associated one or more resource block sets (RB sets) indicated by the upper layer as "continuous listen-before-talk failure (C-LBT Failure)".

[0192] or,

[0193] Optionally, the user equipment randomly selects time-frequency resources from a (candidate) resource set indicated (or reported) by the physical layer. Optionally, one or more candidate resources are excluded from the (candidate) resource set indicated (or reported) by the physical layer. The one or more candidate resources represent candidate resources including (intra-cell) guardband (GB) resource blocks in the subchannel with the smallest number (optionally, the high-level RRC parameters are set to resource allocation based on continuous RBs), or represent candidate resources in a resource block set of "continuous listen-before-talk failure (C-LBT Failure)" indicated by the upper layer, which is included in the associated one or more resource block sets (RB sets).

[0194] [Example 2]

[0195] Figure 2 It is a schematic diagram showing the basic process of the method executed by the user equipment according to the second embodiment of the present invention.

[0196] Next, combine Figure 2 The basic process diagram shown is used to describe in detail the method executed by the user equipment according to the second embodiment of the present invention.

[0197] like Figure 2 As shown, in the second embodiment of the present invention, the steps performed by the user equipment include:

[0198] In step S201, on an unlicensed spectrum (or on a shared spectrum), a sideline communication user equipment determines the number Q′ of coded modulation symbols of a second level SCI. SCI2 .

[0199] Optionally, the Q′ SCI2 At least one parameter to determine. Indicates the number of resource blocks (RBs) (or bandwidth) allocated (or scheduled) for PSSCH transmission, expressed as the number of subcarriers (i.e., the number of RBs × 12). Specifically, if the high-level RRC configuration is "resource allocation based on interlace RBs", the number of RBs n PRB =n ref ×n inter，subCH ×n subCH ×n RB-set ,in,

[0200] ■n ref Indicates the number of reference PRBs corresponding to each interlace in a resource block set (RB set);

[0201] ■n inter，subCH Indicates the number of interleavings contained in each configured subchannel;

[0202] ■n subCH Indicates the number of subchannels occupied by the PSSCH transmission in a resource block set;

[0203] ■n RB-set Indicates the number of resource block sets occupied by the PSSCH transmission.

[0204] If the high-level RRC configuration is "resource allocation based on contiguous RBs", the number of RBs n PRB =n subCHsize ×n subCH ,in,

[0205] ■n subCHsize Indicates the number of resource blocks RB contained in the configured subchannel;

[0206] ■n subCH Indicates the subchannel allocated for PSSCH transmission.

[0207] In step S202, the sideline communication user equipment receives the first level SCI and the second level SCI.

[0208] Figure 3 is a block diagram showing a user equipment UE involved in the present invention. Figure 3 As 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. The memory 302 stores program instructions. When the instructions are executed by the processor 301, the above method performed by the user equipment described in detail in the present invention may be executed.

[0209] The method of the present invention and the related equipment have been described above in conjunction with the preferred embodiments. Those skilled in the art will appreciate that the method shown above is only exemplary, and the embodiments described above can be combined with each other without contradiction. The method of the present invention is not limited to the steps and sequence shown above. The network node and user equipment shown above may include more modules, for example, modules that can be developed or developed in the future and can be used for base stations, MMEs, or UEs, etc. The various identifiers shown above are only exemplary and not restrictive, and the present invention is not limited to the specific information elements that serve as examples of these identifiers. Those skilled in the art may make many changes and modifications based on the teachings of the illustrated embodiments.

[0210] 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, the various components inside the base station and 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 the like.

[0211] In this application, "base station" may refer to a mobile communication data and control exchange center with a large transmission power and a wide coverage area, including functions such as resource allocation scheduling, data reception and transmission, etc. "User equipment" may refer to a user mobile terminal, such as a mobile phone, a notebook, etc., which can communicate wirelessly with a base station or a micro base station.

[0212] 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 a computer program logic is encoded, and when executed on a computing device, the computer program logic provides relevant operations to implement the above-mentioned technical solution of the present invention. When executed on at least one processor of a computing system, the computer program logic causes the processor to perform the operation (method) described in the embodiment of the present invention. This arrangement of the present invention is typically provided as software, code and / or other data structures arranged 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 ROM or RAM or PROM chips, or downloadable software images in one or more modules, shared databases, 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 solution described in the embodiment of the present invention.

[0213] In addition, each functional module or each feature of the base station equipment and terminal equipment used in each of the above embodiments can be implemented or executed by a circuit, and the circuit is generally one or more integrated circuits. The circuit designed to perform the various functions described in this specification may include a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC) or a general-purpose integrated circuit, a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic, or a discrete hardware component, or any combination of the above devices. The general-purpose processor may be a microprocessor, or the processor may be an existing processor, a controller, a microcontroller or a state machine. The above-mentioned general-purpose processor or each circuit may be configured by a digital circuit, or may be configured by a logic circuit. In addition, when, due to the progress of semiconductor technology, an advanced technology that can replace the current integrated circuit appears, the present invention may also use the integrated circuit obtained by using the advanced technology.

[0214] Although the present invention has been illustrated above in conjunction with the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications, substitutions and changes may 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-described embodiments, but by the appended claims and their equivalents.

Claims

1. A method performed by a user equipment, comprising the following steps: Selectively generate a selected sideline communication scheduling grant in an unlicensed spectrum; as well as A transmission resource selection or reselection process is performed for the selected sideline communication scheduling permission.

2. The method according to claim 1, wherein: The selected sideline communication scheduling permission corresponds to the transmission of one or more MAC protocol data units PDU.

3. The method according to claim 1, wherein: The steps of executing the transmission resource selection or reselection process include: A random selection process that randomly selects time-frequency resources from a resource pool.

4. The method according to claim 3, wherein: The random selection process excludes one or more candidate resources, wherein the one or more candidate resources represent candidate resources including a guard band resource block within a cell in a subchannel with a minimum number, or represent candidate resources whose associated one or more resource block sets are included in a resource block set corresponding to "continuous listen-before-speak failure" indicated by an upper layer.

5. The method according to claim 1, wherein: The steps of executing the transmission resource selection or reselection process include: The time-frequency resources are randomly selected from the candidate resource set indicated or reported by the physical layer.

6. The method according to claim 5, wherein: One or more candidate resources are excluded from the candidate resource set indicated or reported by the physical layer, and the one or more candidate resources represent candidate resources including the protection band resource blocks in the cell in the subchannel with the smallest number, or represent candidate resources included in the associated one or more resource block sets in the resource block set corresponding to the "continuous listen-before-speak failure" indicated by the upper layer.

7. A method performed by a user equipment, comprising the following steps: Determining, in an unlicensed spectrum, a number of coded modulation symbols of a second level SCI; as well as The first level SCI and the second level SCI are received.

8. The method according to claim 7, wherein: The number of coded modulation symbols is determined by at least a parameter indicating the number of resource blocks RBs or bandwidth allocated or scheduled for PSSCH transmission.

9. The method according to claim 8, wherein: The calculation method of the number of RBs is different based on whether the high-level RRC configuration is based on resource allocation based on interleaved resource blocks or based on resource allocation based on continuous resource blocks.

10. A user equipment, comprising: processor; as well as Memory, which stores instructions, Wherein, when the instructions are executed by the processor, the method according to any one of claims 1-9 is performed.

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