Method executed by user equipment and user equipment

Abstract

The invention provides a method executed by user equipment and the user equipment. The method executed by user equipment UE comprises the following steps: the UE serving as sidewalk communication user equipment receives MAC CE and / or sidewalk communication control information SCI on an unlicensed spectrum or a shared spectrum; and the UE determines a preference resource set or a non-preference resource set, the MAC CE comprises first IUC request information serving as request information of cooperative IUC between UEs, and the first IUC request information comprises indication information of a first resource block set RB set number, namely indication information of the first RB set number.

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, the research topic on using LTE devices to implement proximity D2D communication services was approved (see Non-Patent Document 1). The functions introduced by LTE Release 12 D2D include:

[0003] 1) Discovery function between neighboring devices in the 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, the 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 the no-network-coverage scenario and 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, the 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 vehicles and all entities that may affect vehicles, 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 sidelink 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 cellular vehicle-to-everything communication problems in high-speed (up to 250 km / h) and high-node-density environments. Vehicles can interact information such as position, 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 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 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#90e plenary session in December 2020, the standardization research project on NR sidelink enhancement (NR sidelink enhancement) that has been standardized (see Non-Patent Document 6) was approved. The enhancement of sidelink communication includes the following three aspects:

[0022] 1) Standardize the resource allocation mode for reducing the power consumption of user equipment in sidelink communication, including but not limited to: the partial sensing-based resource allocation mode (partial sensing), the random resource selection-based resource allocation mode;

[0023] 2) Research and improve the communication reliability of resource allocation mode 2 in NR sidelink communication and reduce the communication delay of resource allocation mode 2, including: Inter-UE coordination. Inter-UE coordination means that UE A determines a resource set and sends (indicates) this resource set to UE B. The resource allocation mode of UE B is resource allocation mode 2, and this resource set indicated by UE A is taken into account when selecting resources;

[0024] 3) Standardize the sidelink discontinuous reception (SL Discontinuous Reception, abbreviated as SL DRX) mechanism. In 5G NR communication, user equipment supports receiving the physical downlink control channel PDCCH discontinuously in time, which is called DRX, and can effectively reduce the power consumption of communication equipment. Similarly, corresponding to SL DRX, discontinuous reception refers to receiving the physical sidelink communication control channel PSCCH during part of the time in the time domain, and this time is called the active period (Activetime); the time when PSCCH is not received is called the in-active period (In-active time).

[0025] In the 3GPP RAN1 #104bis-e meeting in April 2021, the following conclusions were reached regarding Inter-UE coordination in mode 2 (IUC) (see Non-Patent Document 7):

[0026] Inter-UE coordination supports the following two scenarios:

[0027] ○ Inter-UE coordination scenario 1: The coordination message sent from UE A to UE B is an indication of a resource set. This resource set is for resources preferred for UE B's transmission and / or for resources non-preferred for UE B's transmission;

[0028] ○ Inter-UE coordination scenario 2: The coordination message sent from UE A to UE B indicates that there is an expected (or potential) resource conflict on the resources indicated by the SCI sent by UE B, and / or indicates that there is a detected resource conflict on the resources indicated by the SCI sent by UE B.

[0029] At the 3GPP RAN #95e plenary session in March 2022, the standardization research topic based on the evolution of the already standardized NR sidelink communication (NR sidelink evolution, abbreviated as NR SL evo) (see Non-Patent Document 8) was approved. The research objectives of NR SL evo include the following aspects:

[0030] 1) Research and standardize NR sidelink communication in the 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:

[0031] a. In SL-U, the channel access technology and operations of NR in unlicensed spectrum communication (NR-U) are reused. Among them, the channel access technology of NR-U refers to the Listen Before Talk (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 can transmit; otherwise, it gives up transmission.

[0032] b. Study 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.

[0033] The solution of this patent includes a method for triggering the reporting of cooperative information between UEs after the user equipment in SL-U receives a cooperative request between UEs.

[0034] Prior art documents

[0035] Non-patent literature

[0036] Non-patent literature 1: RP-140518, Work item proposal on LTE Device to Device Proximity Services

[0037] Non-patent literature 2: RP-142311, Work Item Proposal for Enhanced LTE Device to Device Proximity Services

[0038] Non-patent literature 3: RP-152293, New WI proposal: Support for V2V services based on LTE sidelink

[0039] Non-patent literature 4: RP-170798, New WID on 3GPP V2X Phase 2

[0040] Non-patent literature 5: RP-181480, New SID Proposal: Study on NR V2X

[0041] Non-patent literature 6: RP-202846, WID revision: NR sidelink enhancement

[0042] Non - Patent Document 7: RAN1#104bis - e, Chairman's notes, section 8.11.1.2

[0043] Non - Patent Document 8: RP - 220300, WID revision: NR sidelink evolution Summary of the Invention

[0044] 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.

[0045] According to a first aspect of the present invention, there is provided a method executed by a user equipment UE, including: the UE, as a sidelink communication user equipment, receives MAC CE and / or sidelink communication control information SCI on an unlicensed spectrum or a shared spectrum; and the UE determines a preferred resource set or a non - preferred resource set, wherein the MAC CE includes first IUC request information as request information for cooperative IUC between UEs, and the first IUC request information includes indication information of the number of a first resource block set RBset, i.e., first RB set number indication information.

[0046] In the method of the above - mentioned first aspect, the SCI includes second IUC request information, and the second IUC request information includes indication information of the number of a second RB set, i.e., second RB set number indication information.

[0047] In the method of the above - mentioned first aspect, the first RB set number indication information and the second RB set number indication information are the same.

[0048] In the method of the above - mentioned first aspect, when the UE receives MAC CE and sidelink communication control information SCI, the SCI includes scheduling information of the MAC CE.

[0049] In the method of the above - mentioned first aspect, the 8th bit in the 6th byte and the 1st and 2nd bits in the 7th byte of the MAC CE are the first RB set number indication information.

[0050] In the method of the above - mentioned first aspect, the transmission structure of the physical sidelink communication control channel PSCCH / physical sidelink communication shared channel PSSCH is configured based on interleaved resource blocks.

[0051] In the method of the above - mentioned first aspect, when the RRC parameter transmissionStructureForPSCCHandPSSCH is configured as "interlaceRB", an IUC report is triggered by the MAC CE.

[0052] In the method of the first aspect above, the MAC layer provides the first RB set number indication information or the second RB set number indication information to the physical layer to determine the preferred resource set or the non-preferred resource set.

[0053] In addition, according to a second aspect of 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 method described above.

[0054] Advantages of the present invention

[0055] In SL-U, the solution of the present invention describes that after receiving a MAC CE containing UE - to - UE cooperation request (IUC request) information sent by another user equipment, the user equipment indicates the indication information of the resource block set (RB set) number to the physical layer. This solution effectively ensures that the above - mentioned MAC CE and the corresponding SCI received by the user equipment contain the indication information of the same RB set number. In this way, the MAC layer can either select the RB set number indication information in the SCI or the RB set number indication information in the MAC CE, improving the availability of the indication information and further enhancing the transmission reliability of the sidelink communication on the unlicensed spectrum. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Through the following detailed description in conjunction with the drawings, the above and other features of the present invention will become more obvious, where:

[0057] Figure 1 is a schematic diagram showing the basic process of the method executed by the user equipment in the first embodiment of the present invention.

[0058] Figure 2 is a block diagram showing the user equipment according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0059] The present invention will be described in detail below in conjunction with the drawings and specific embodiments. It should be noted that the present invention should not be limited to the specific embodiments described below. Additionally, for the sake of simplicity, the detailed description of the well - known technologies that have no direct relation to the present invention is omitted to prevent confusion in the understanding of the present invention.

[0060] 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 pointed out 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.

[0061] 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 systems, but the present invention uses unified terms, and when applied to specific systems, they can be replaced with the terms used in the corresponding systems.

[0062] 3GPP: 3rd Generation Partnership Project, the Third Generation Partnership Project

[0063] LTE: Long Term Evolution, Long Term Evolution technology

[0064] NR: New Radio, New Radio, New Air Interface

[0065] PDCCH: Physical Downlink Control Channel, Physical Downlink Control Channel

[0066] DCI: Downlink Control Information, Downlink Control Information

[0067] PDSCH: Physical Downlink Shared Channel, Physical Downlink Shared Channel

[0068] UE: User Equipment, User Equipment

[0069] eNB: evolved NodeB, evolved NodeB

[0070] gNB: NR base station

[0071] TTI: Transmission Time Interval, Transmission Time Interval

[0072] OFDM: Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing

[0073] CP-OFDM: Cyclic Prefix Orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing with Cyclic Prefix

[0074] C-RNTI: Cell Radio Network Temporary Identitier, the cell radio network temporary identifier

[0075] CSI: Channel State Information, the channel state information

[0076] HARQ: Hybrid Automatic Repeat Request, the hybrid automatic repeat request

[0077] CSI-RS: Channel State Information Reference Signal, the channel state information reference signal

[0078] CRS: Cell Reference Signal, the cell-specific reference signal

[0079] PUCCH: Physical Uplink Control Channel, the physical uplink control channel

[0080] PUSCH: Physical Uplink Shared Channel, the physical uplink shared channel

[0081] UL-SCH: Uplink Shared Channel, the uplink shared channel

[0082] CG: Configured Grant, the configured grant

[0083] Sidelink: Sidelink communication

[0084] SCI: Sidelink Control Information, the sidelink control information

[0085] PSCCH: Physical Sidelink Control Channel, the physical sidelink control channel

[0086] MCS: Modulation and Coding Scheme, the modulation and coding scheme

[0087] RB: Resource Block, the resource block

[0088] RE: Resource Element, the resource element

[0089] CRB: Common Resource Block, the common resource block

[0090] CP: Cyclic Prefix, cyclic prefix

[0091] PRB: Physical Resource Block, physical resource block

[0092] PSSCH: Physical Sidelink Shared Channel, physical sidelink shared channel

[0093] FDM: Frequency Division Multiplexing, frequency division multiplexing

[0094] RRC: Radio Resource Control, radio resource control

[0095] RSRP: Reference Signal Receiving Power, reference signal receiving power

[0096] SRS: Sounding Reference Signal, sounding reference signal

[0097] DMRS: Demodulation Reference Signal, demodulation reference signal

[0098] CRC: Cyclic Redundancy Check, cyclic redundancy check

[0099] PSDCH: Physical Sidelink Discovery Channel, physical sidelink discovery channel

[0100] PSBCH: Physical Sidelink Broadcast Channel, physical sidelink broadcast channel

[0101] SFI: Slot Format Indication, slot format indication

[0102] TDD: Time Division Duplexing, time division duplexing

[0103] FDD: Frequency Division Duplexing, frequency division duplexing

[0104] SIB: System Information Block, system information block

[0105] SIB1: System Information Block Type 1, the system information block type 1

[0106] SLSS: Sidelink synchronization Signal, the sidelink communication synchronization signal

[0107] PSSS: Primary Sidelink Synchronization Signal, the primary sidelink communication synchronization signal

[0108] SSSS: Secondary Sidelink Synchronization Signal, the secondary sidelink communication synchronization signal

[0109] PCI: Physical Cell ID, the physical cell identifier

[0110] PSS: Primary Synchronization Signal, the primary synchronization signal

[0111] SSS: Secondary Synchronization Signal, the secondary synchronization signal

[0112] BWP: BandWidth Part, the bandwidth segment / part

[0113] GNSS: Global Navigation Satellite System, the global navigation satellite positioning system

[0114] SFN: System Frame Number, the system (radio) frame number

[0115] DFN: Direct Frame Number, the direct frame number

[0116] IE: Information Element, the information element

[0117] SSB: Synchronization Signal Block, the synchronization system information block

[0118] EN-DC: EUTRA-NR Dual Connection, the LTE-NR dual connection

[0119] MCG: Master Cell Group, the master cell group

[0120] SCG: Secondary Cell Group, the secondary cell group

[0121] PCell: Primary Cell, the primary cell

[0122] SCell: Secondary Cell, the secondary cell

[0123] PSFCH: Physical Sidelink Feedback Channel, the physical sidelink communication feedback channel

[0124] SPS: Semi-Persistant Scheduling, semi-static scheduling

[0125] TA: Timing Advance, uplink timing advance

[0126] PT-RS: Phase-Tracking Reference Signals, phase-tracking reference signals

[0127] TB: Transport Block, the transport block

[0128] CB: Code Block, the coded block / code block

[0129] QPSK: Quadrature Phase Shift Keying, quadrature phase shift keying

[0130] 16 / 64 / 256QAM: 16 / 64 / 256Quadrature Amplitude Modul ation, quadrature amplitude modulation

[0131] AGC: Auto Gain Control, automatic gain control

[0132] TDRA(field): Time Domain Resource Assignment, time domain resource allocation indication (field)

[0133] FDRA(field): Frequency Domain Resource Assignment, frequency domain resource allocation indication (field)

[0134] ARFCN: Absolute Radio Frequency Channel Number, absolute radio frequency channel number

[0135] SC-FDMA: Single Carrier-Frequency Division Multiple Access, Single Carrier - Frequency Division Multiple Access

[0136] MAC: Medium Access Control, Medium Access Control layer

[0137] MAC CE: MAC Control Element, MAC layer control unit

[0138] PDU: Protocol Data Unit, Protocol Data Unit

[0139] DRX: Discontinuous Reception, Discontinuous Reception

[0140] SL-U: Sidelink unlicensed, Sidelink communication on unlicensed spectrum

[0141] NR-U: NR unlicensed, NR communication on unlicensed spectrum

[0142] LBT: Listen Before Talk, Listen Before Talk

[0143] TBS: Transport Block Size, Transport Block Size

[0144] CQI: Channel Quality Information, Channel Quality Information

[0145] CPE: Cyclic Prefix extension, Cyclic Prefix extension

[0146] COT: Channel Occupancy Time, Channel Occupancy Time

[0147] MCSt: Multiple Consecutive Slots transmission, Multiple Consecutive Slots transmission

[0148] IUC: Inter-UE Coordination, Inter-UE coordination

[0149] The following is a description of the prior art related to 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.

[0150] It should be noted that in the specification of the present invention, V2X and sidelink have the same meaning. V2X in the text can also represent sidelink; similarly, sidelink in the text can also represent V2X, and no specific distinction or limitation will be made hereinafter.

[0151] 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.

[0152] PSCCH in the specification of the present invention is used to carry SCI. The meanings of 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 both represent associatedPSSCH or corresponding PSSCH. Similarly, the meanings of 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 both represent associated SCI or corresponding SCI. It should be noted that the first-stage SCI is called 1st stage SCI or SCI format1-A and is transmitted in the PSCCH; the second-stage SCI is called 2nd stage SCI or SCI format 2-A (or, SCIformat 2-B, or, SCI format 2-C) and is transmitted in the resources of the corresponding PSSCH.

[0153] NR sidelink communication (abbreviated as SL-U) on the unlicensed spectrum in the specification of the present invention can also be called 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.

[0154] Parameter set (numerology) in NR (including NR sidelink) and Time slot

[0155] The parameter set numerology has two aspects of meaning: subcarrier spacing and cyclic prefix (CP) length. Among them, NR supports 5 subcarrier spacings, which are 15k, 30k, 60k, 120k, and 240 kHz (corresponding to μ = 0, 1, 2, 3, 4). Table 4.2-1 shows the supported transmission parameter sets, which are specifically as follows.

[0156] Table 4.2-1 Subcarrier Spacings Supported by NR

[0157] 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

[0158] Extended CP is only supported when μ = 2, that is, 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, that is, a 15 kHz subcarrier spacing, 1 slot = 1 ms; for μ = 1, that is, a 30 kHz subcarrier spacing, 1 slot = 0.5 ms; for μ = 2, that is, a 60 kHz subcarrier spacing, 1 slot = 0.25 ms, and so on.

[0159] NR and LTE have the same definition of a subframe, which represents 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 (with a duration of 10 ms) can be expressed as ranging from 0 to Among them, and The definitions in the case of different subcarrier spacings μ are shown in the following table.

[0160] Table 4.3.2-1: Number of symbols per slot, number of slots per system frame, number of slots per subframe for normal CP

[0161]

[0162] 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)

[0163]

[0164] On an NR carrier, the system frame number (SFN) range of a system frame (or simply referred to as a frame) is from 0 to 1023. In sidelink communication, the concept of a direct system frame number (DFN) is introduced, and its number range is also from 0 to 1023. The above description of the relationship between the system frame and 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 subcarrier spacing of 15 kHz, a direct system frame includes 10 time slots, etc. The DFN is applied to the timing on the sidelink carrier.

[0165] Resource Block RB and Resource Element RE

[0166] A resource block (RB) is defined in the frequency domain as 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.

[0167] Scenarios of Sidelink Communication

[0168] 1) Out-of-Coverage sidelink communication: Neither of the two UEs performing sidelink communication has network coverage (for example, a UE does not detect any cell that satisfies the "cell selection criterion" on the frequency where sidelink communication is required, indicating that the UE has no network coverage).

[0169] 2) In-Coverage sidelink communication: Both of the two UEs performing sidelink communication have network coverage (for example, a UE detects at least one cell that satisfies the "cell selection criterion" on the frequency where sidelink communication is required, indicating that the UE has network coverage).

[0170] 3) Partial-Coverage sidelink communication: One of the UEs performing sidelink communication has no network coverage, and the other UE has network coverage.

[0171] 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.

[0172] Sidelink Resource Pool

[0173] In sidelink communication, the resources for both the transmission and reception of the UE belong to the resource pool. For example, for the transmission mode based on base station scheduling in sidelink communication, the base station schedules the transmission resources for the sidelink UE in the resource pool. Or, for the transmission mode based on UE sensing in sidelink communication, the UE determines the transmission resources in the resource pool.

[0174] For NR sidelink communication, resource allocation is supported based on sub-channels 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 several consecutive resource blocks (RBs) in the frequency domain.

[0175] Perception-based Resource Allocation Method

[0176] For the sensing-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 unexcluded candidate resources to the MAC layer, and the MAC layer selects the transmission resources for 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 make any restrictions on this.

[0177] The partial sensing 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.

[0178] Resource Selection Window [n + T1, n + T2]

[0179] In the sensing (or partial sensing)-based resource allocation method, the higher layer requests or triggers the physical layer to determine the resources for PSSCH / PSCCH transmission (for sensing or partial sensing) at 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 includes a configuration list sl-Selection WindowList of resource selection windows, where the list corresponds to a given priority prio TX The element of (the priority for transmitting 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 for sidelink communication, that is, the subcarrier spacing is ):

[0180] Table 8.1.4-2: The value of

[0181]

[0182] Table 8.1.4-1: The value of

[0183]

[0184] LBT (Listen Before Talk) Mechanism

[0185] For wireless communication on unlicensed spectrum, some countries or regions (such as the European region) stipulate that before a user equipment performs wireless communication transmission, it needs to perform LBT operation, that is, the "listen before talk" mechanism, which can also be called channel access operation, representing a mechanism for judging channel availability by sensing the channel. Specifically, within a period of time before communication transmission, the user equipment will only perform transmission when it detects that the channel is idle; otherwise, the user equipment will not perform transmission.

[0186] 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. Within this time unit, if the energy detected by the base station or the user equipment on the channel is lower than the energy threshold X ThreshWhen the duration is equal to or exceeds 4 μs, the base station or user equipment considers the channel to be idle within this time unit (or, referred to as LBT success). It is worth noting that the channel for which the base station or user equipment detects energy and uses to determine whether it is idle represents a carrier containing a set of consecutive resource blocks (RBs), or a part of the carrier. This channel can also be called the LBT bandwidth, or the LBT sub-band, or the 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 RBs corresponding to the multiple RB sets included in a carrier (a carrier exceeding 20 MHz, such as 40 MHz, 60 MHz, 80 MHz) and the guard band (GB) between two consecutive RB sets can be as shown in the following table:

[0187] Table 1: Number of RBs included in all RB sets and GBs on a carrier with 15 kHz and 30 kHz subcarrier spacings

[0188]

[0189] 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 the 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, totaling 216 consecutive RBs, and so on for the other items in Table 1.

[0190] It is worth noting that the LBT operations performed by the (sidelink communication) user equipment on different RB sets can be independent of each other (i.e., they are not related to 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 simultaneously include the (all or part of) RBs corresponding to RB set 1 and RB set 2, the user equipment can 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.

[0191] Inter-UE Coordination (IUC)

[0192] Cooperation between UEs supports the following two scenarios:

[0193] ■Cooperation solution 1 between UEs: The cooperation message sent from UE A to UE B is an indication of a resource set. This resource set is a preferred resource set for UE B's transmission, and / or a non-preferred resource set for UE B's transmission;

[0194] ■Cooperation solution 2 between UEs: The cooperation message sent from UE A to UE B indicates that there is an expected (or potential) resource conflict on the resources indicated by the SCI sent by UE B, and / or indicates that there is a detected resource conflict on the resources indicated by the SCI sent by UE B.

[0195] In the solution of the present invention, it refers to cooperation solution 1 between UEs, that is, the reported cooperation information between UEs is a preferred resource set or a non-preferred resource set.

[0196] Hereinafter, specific examples, embodiments, etc. involved in the present invention will be described in detail. In addition, as described above, the examples and embodiments described in the present disclosure are exemplary descriptions for easy understanding of the present invention, and are not limitations on the present invention.

[0197] [Embodiment 1]

[0198] Figure 1 It is a schematic diagram showing the basic process of the method executed by a user equipment in Embodiment 1 of the present invention.

[0199] Next, in combination with Figure 1 The basic process diagram shown is used to describe in detail the method executed by the user equipment in Embodiment 1 of the present invention.

[0200] As Figure 1 shown, in Embodiment 1 of the present invention, the steps executed by the user equipment include:

[0201] In step S101, on the unlicensed spectrum or on the shared spectrum, the sidelink communication user equipment receives MAC CE and / or sidelink communication control information SCI.

[0202] Optionally, the transmission structure of PSCCH / PSSCH is configured based on interlaced resource blocks (interlaced RB), that is, the RRC parameter transmissionStructureForPSCCHandPSSCH is configured as "interlaceRB".

[0203] The SCI includes scheduling information of the MAC CE.

[0204] The MAC CE includes first IUC request information that is request information for cooperative IUC between UEs. The first IUC request information includes indication information of the number of the first resource block sets RB set, i.e., the first RB set number indication information.

[0205] Optionally, the SCI includes second IUC request information. The second IUC request information includes indication information of the number of the second RB sets.

[0206] Optionally, the first RB set number indication information and the second RB set number indication information are the same.

[0207] Optionally, if the RRC parameter transmissionStructureForPSCCHandPSSCH is configured as "interlaceRB", then the IUC report can be triggered by the MAC CE.

[0208] Optionally, the 8th bit in the 6th byte and the 1st and 2nd (or, the 1st) bits in the 7th byte of the MAC CE are the indication information of the number of the first RB sets.

[0209] In step 102, the user equipment determines a preferred resource set or a non-preferred resource set.

[0210] Optionally, the MAC layer provides (or, indicates) the first RB set number indication information or the second RB set number indication information to the physical layer to determine the preferred resource set or the non-preferred resource set.

[0211] Figure 2 It is a block diagram showing a user equipment UE involved in the present invention. As Figure 2 shown, the user equipment UE80 includes a processor 801 and a memory 802. The processor 801 may include, for example, a microprocessor, a microcontroller, an embedded processor, etc. The memory 802 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 802. When executed by the processor 801, these instructions can execute the above methods performed by the user equipment described in detail in the present invention.

[0212] The method of the present invention and the related devices have been described above in connection with the preferred embodiments. Those skilled in the art can understand that the methods shown above are merely exemplary, and the embodiments described above can be combined with each other without conflict. The method of the present invention is not limited to the steps and sequences shown above. The network nodes and user devices 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 in base stations, MMEs, or UEs, etc. The various identifiers shown above are merely exemplary rather than restrictive, and 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 illustrated embodiments.

[0213] It should be understood that the above embodiments of the present invention can be implemented by software, hardware, or a combination of both software and hardware. For example, the various components inside the base stations and user devices 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.

[0214] 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 device" may refer to a user mobile terminal, such as a mobile phone, a notebook, etc., which are terminal devices that can communicate wirelessly with a base station or a micro base station.

[0215] 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 with a computer-readable medium encoded with computer program logic, which provides related operations to implement the above technical solutions of the present invention when executed on a computing device. When executed on at least one processor of a computing system, the computer program logic causes the processor to perform the operations (methods) described in the embodiments of the present invention. This arrangement 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., a 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, a shared database, etc. in one or more modules. 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 perform the technical solutions described in the embodiments of the present invention.

[0216] 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 generally 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 gate 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 may also use the integrated circuit obtained by using this advanced technology.

[0217] 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 UE, comprising: The UE, as a sidelink communication user equipment, receives MAC CE and / or sidelink communication control information SCI on an unlicensed spectrum or a shared spectrum; and The UE determines a preferred resource set or a non-preferred resource set, wherein the MAC CE includes first IUC request information as request information for cooperation IUC between UEs, and the first IUC request information includes indication information of the number of a first resource block set RB set, i.e., first RB set number indication information.

2. The method performed by a user equipment UE according to claim 1, wherein The SCI includes second IUC request information, The second IUC request information includes indication information of the number of a second RB set, i.e., second RB set number indication information.

3. The method performed by a user equipment UE according to claim 2, wherein The first RB set number indication information and the second RB set number indication information are the same.

4. The method performed by a user equipment UE according to claim 1, wherein When the UE receives the MAC CE and the sidelink communication control information SCI, The SCI includes scheduling information of the MAC CE.

5. The method performed by a user equipment UE according to claim 1, wherein The 8th bit in the 6th byte and the 1st and 2nd bits in the 7th byte of the MAC CE are the first RB set number indication information.

6. The method performed by a user equipment UE according to claim 1, wherein The transmission structure of the physical sidelink communication control channel PSCCH / physical sidelink communication shared channel PSSCH is configured based on interleaved resource blocks.

7. The method performed by a user equipment UE according to claim 1, wherein When the RRC parameter transmissionStructureForPSCCHandPSSCH is configured as "interlaceRB", an IUC report is triggered by the MAC CE.

8. The method performed by a user equipment UE according to claim 1, wherein The MAC layer provides the first RB set number indication information or the second RB set number indication information to the physical layer to determine the preferred resource set or the non-preferred resource set.

9. A user equipment, comprising: A processor; and A memory storing instructions, wherein the instructions, when run by the processor, perform the method according to any one of claims 1 to 8.

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