Method performed by a user equipment and user equipment

Abstract

The application provides a method executed by a user equipment and the user equipment, the method comprises the following steps: a high layer or an upper layer of the user equipment requests a physical layer to determine a sidelink communication resource subset; the user equipment performs reevaluation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wireless communication, and in particular to a method executed by a user equipment and a corresponding user equipment. BACKGROUND

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

[0003] 1) Discovery function between proximate devices under LTE network coverage scenario;

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

[0005] 3) High-level support for Unicast and Groupcast communication functions.

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

[0007] 1) D2D discovery in network coverage scenarios and partial network coverage scenarios;

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

[0009] Based on the design of the D2D communication mechanism, in June 2015, at the 68th plenary session of the 3GPP RAN, the V2X feasibility study based on D2D communication was approved. V2X means Vehicle to everything, and aims to realize the information interaction between vehicles and all entities that can affect vehicles, so as to reduce accidents, alleviate traffic congestion, reduce environmental pollution, and provide other information services. The application scenarios of V2X mainly include four aspects:

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

[0011] 2) V2P, Vehicle to Pedestrian, i.e. sending warning from vehicle to pedestrian or non-motorized vehicle;

[0012] 3) V2N, Vehicle to Network, i.e. vehicle connecting to mobile network;

[0013] 4) V2I, Vehicle to Infrastructure, i.e. vehicle communicating with road infrastructure, etc.

[0014] 3GPP divides the research and standardization of V2X into three stages. The first stage was completed in September 2016, which mainly focuses on V2V, based on LTE Release 12 and Release 13 D2D (also known as sidelink, i.e. adjacent communication technology) to develop (see Non-Patent Literature 3). V2X stage 1 introduces a new D2D communication interface, called PC5 interface. The PC5 interface is mainly used to solve the problem of cellular vehicle networking communication in high-speed (up to 250 kilometers / hour) and high node density environment. Vehicles can interact information such as location, speed and direction through the PC5 interface, i.e. vehicles can directly communicate through the PC5 interface. Compared with the adjacent communication between D2D devices, the functions introduced by LTE Release 14 V2X mainly include:

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

[0016] 2) Introducing sub-channels to enhance resource allocation methods;

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

[0018] The second stage of V2X research is attributed to LTE Release 15 research (see Non-Patent Literature 4), which mainly includes 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 stage of V2X feasibility study based on 5G NR network technology (see Non-Patent Literature 5) was approved.

[0020] In 5G NR V2X, a resource allocation mode 2, also known as transmission mode 2, is supported. In resource allocation mode 2, the physical layer of a user equipment senses the transmission resources in a resource pool and reports a set of available transmission resources to the upper layer. The upper layer selects the resources for sidelink transmission after obtaining the report from the physical layer. For the selected sidelink resources (or, the selected sidelink grant), the upper layer re-evaluates part or all of the sidelink resources.

[0021] The solution of the present patent mainly includes a method for a user equipment to determine a time instant to trigger re-evaluation, and a method for a user equipment to determine whether to re-evaluate sidelink resources.

[0022] Prior art documents

[0023] Non-patent documents

[0024] Non-patent document 1: RP-140518, Work item proposal on LTE Device to Device Proximity Services

[0025] Non-patent document 2: RP-142311, Work Item Proposal for Enhanced LTE Device to Device Proximity Services

[0026] Non-patent document 3: RP-152293, New WI proposal: Support for V2V services based on LTE sidelink

[0027] Non-patent document 4: RP-170798, New WID on 3GPP V2X Phase 2

[0028] Non-patent document 5: RP-181480, New SID Proposal: Study on NR V2X Summary of the invention

[0029] To solve at least part of the above problems, the present patent provides a method executed by a user equipment and a user equipment.

[0030] A method performed by a user equipment according to a first aspect of the present invention includes: the higher or upper layer of the user equipment requesting the physical layer to determine a subset of sideline communication resources; and the user equipment performing a re-evaluation.

[0031] According to the method described above in the first aspect of the present invention, the higher layer or upper layer selects side-by-side communication resources from the subset of side-by-side communication resources.

[0032] According to the method described above in the first aspect of the present invention, the selected side-link communication resource is a selected side-link communication scheduling license.

[0033] According to the method described above in the first aspect of the present invention, the higher layer or upper layer requests or triggers the process of determining a subset of side-by-side communication resources on slot n.

[0034] According to the method described above in the first aspect of the present invention, the user equipment re-evaluates one or more resources in the selected side-link communication scheduling license, and the user equipment first indicates the one or more resources in slot m.

[0035] According to the method described above in the first aspect of the present invention, if the time slot n is earlier than the time slot in the time domain... Then the user equipment in the time slot The above re-evaluates one or more of the resources, wherein, This indicates the delay in the first processing step.

[0036] According to the method described above in the first aspect of the present invention, if the time slot n is later than or equal to the time slot in the time domain... Then the user equipment does not re-evaluate the one or more resources, wherein, This indicates the delay in the first processing step.

[0037] A user equipment according to a second aspect of the present invention includes: a processor; and a memory storing instructions; wherein the instructions, when executed by the processor, perform any of the methods described in the first aspect of the present invention.

[0038] Advantages of the present application

[0039] According to the solution of this patent, in NR V2X side-by-side communication, for the resource allocation method 2 based on user equipment awareness, the solution of this invention can ensure that for the side-by-side communication resources selected by the upper layer, the time of triggering re-evaluation occurs after the time of triggering awareness and selecting the side-by-side communication resource, so that the re-evaluation of the side-by-side communication resources can be effectively carried out, thereby improving the efficiency of user equipment awareness and the transmission reliability of side-by-side communication. Attached Figure Description

[0040] The above and other features of the present application will become more apparent by describing in detail the embodiments thereof with reference to the attached drawings, in which:

[0041] Figure 1 is a schematic diagram illustrating LTE V2X UE sidelink communication.

[0042] Figure 2 is a schematic diagram illustrating LTE V2X resource allocation.

[0043] Figure 3 is a schematic diagram illustrating the basic procedure of the method performed by the user equipment in the embodiments one and two of the present application.

[0044] Figure 4 is a schematic diagram illustrating the basic procedure of the method performed by the user equipment in the embodiments three and four of the present application.

[0045] Figure 5 is a block diagram illustrating a user equipment according to an embodiment of the present application. DETAILED DESCRIPTION

[0046] The present application will be described in detail below with reference to the attached drawings and specific embodiments. It should be noted that the present application should not be limited to the specific embodiments described below. In addition, detailed descriptions of well-known technology that is not directly related to the present application are omitted in order to prevent obscuring the understanding of the present application.

[0047] The following describes in detail a plurality of embodiments according to the present application with 5G mobile communication system and its subsequent evolution versions as an example application environment. However, it should be noted that the present application is not limited to the following embodiments, but can be applied to more other wireless communication systems, such as 5G after the communication system and 4G mobile communication system before 5G, etc.

[0048] The following describes some terms related to the present application. If not specifically described, the terms related to the present application are defined herein. The terms given in the present application can be named differently in LTE, LTE-Advanced, LTE-Advanced Pro, NR and later communication systems, but uniform terms are used in the present application, and when applied to a specific system, the terms used in the corresponding system can be replaced.

[0049] 3GPP: 3rd Generation Partnership Project, Third Generation Partnership Project

[0050] LTE: Long Term Evolution, Long Term Evolution technology

[0051] NR: New Radio, new radio

[0052] PDCCH: Physical Downlink Control Channel, physical downlink control channel

[0053] DCI: Downlink Control Information, downlink control information

[0054] PDSCH: Physical Downlink Shared Channel, physical downlink shared channel

[0055] UE: User Equipment, user equipment

[0056] eNB: evolved NodeB, evolved nodeb

[0057] gNB: NR base station

[0058] TTI: Transmission Time Interval, transmission time interval

[0059] OFDM: Orthogonal Frequency Division Multiplexing, orthogonal frequency division multiplexing

[0060] CP-OFDM: Cyclic Prefix Orthogonal Frequency Division Multiplexing, cyclic prefix orthogonal frequency division multiplexing

[0061] C-RNTI: Cell Radio Network Temporary Identifier, cell radio network temporary identifier

[0062] CSI: Channel State Information, channel state information

[0063] HARQ: Hybrid Automatic Repeat Request, hybrid automatic repeat request

[0064] CSI-RS: Channel State Information Reference Signal, channel state information reference signal

[0065] CRS: Cell Reference Signal, cell-specific reference signal

[0066] PUCCH:Physical Uplink Control Channel, physical uplink control channel

[0067] PUSCH:Physical Uplink Shared Channel, physical uplink shared channel

[0068] UL-SCH:Uplink Shared Channel, uplink shared channel

[0069] CG:Configured Grant, configured grant

[0070] Sidelink:side link

[0071] SCI:Sidelink Control Information, sidelink control information

[0072] PSCCH:Physical Sidelink Control Channel, physical sidelink control channel

[0073] MCS:Modulation and Coding Scheme, modulation and coding scheme

[0074] RB:Resource Block, resource block

[0075] RE:Resource Element, resource element

[0076] CRB:Common Resource Block, common resource block

[0077] CP:Cyclic Prefix, cyclic prefix

[0078] PRB:Physical Resource Block, physical resource block

[0079] PSSCH:Physical Sidelink Shared Channel, physical sidelink shared channel

[0080] FDM:Frequency Division Multiplexing, frequency division multiplexing

[0081] RRC:Radio Resource Control, radio resource control

[0082] RSRP:Reference Signal Receiving Power, reference signal receiving power

[0083] SRS:Sounding Reference Signal, sounding reference signal

[0084] DMRS:Demodulation Reference Signal, demodulation reference signal

[0085] CRC:Cyclic Redundancy Check, cyclic redundancy check

[0086] PSDCH:Physical Sidelink Discovery Channel, physical sidelink discovery channel

[0087] PSBCH:Physical Sidelink Broadcast Channel, physical sidelink broadcast channel

[0088] SFI:Slot Format Indication, slot format indication

[0089] TDD:Time Division Duplexing, time division duplexing

[0090] FDD:Frequency Division Duplexing, frequency division duplexing

[0091] SIB1:System Information Block Type 1, system information block type 1

[0092] SLSS:Sidelink synchronization Signal, sidelink synchronization signal

[0093] PSSS:Primary Sidelink Synchronization Signal, primary sidelink synchronization signal

[0094] SSSS:Secondary Sidelink Synchronization Signal, secondary sidelink synchronization signal

[0095] PCI:Physical Cell ID, physical cell id

[0096] PSS:Primary Synchronization Signal, primary synchronization signal

[0097] SSS: Secondary Synchronization Signal

[0098] BWP: BandWidth Part

[0099] GNSS: Global Navigation Satellite System

[0100] SFN: System Frame Number

[0101] DFN: Direct Frame Number

[0102] IE: Information Element

[0103] SSB: Synchronization Signal Block

[0104] EN-DC: EUTRA-NR Dual Connection

[0105] MCG: Master Cell Group

[0106] SCG: Secondary Cell Group

[0107] PCell: Primary Cell

[0108] SCell: Secondary Cell

[0109] PSFCH: Physical Sidelink Feedback Channel

[0110] SPS: Semi-Persistant Scheduling

[0111] TA: Timing Advance

[0112] PT-RS: Phase-Tracking Reference Signals

[0113] TB:Transport Block

[0114] CB:Code Block

[0115] QPSK:Quadrature Phase Shift Keying

[0116] 16 / 64 / 256QAM:16 / 64 / 256Quadrature Amplitude Modulation

[0117] AGC:Auto Gain Control

[0118] TDRA(field):Time Domain Resource Assignment

[0119] FDRA(field):Frequency Domain Resource Assignment

[0120] ARFCN:Absolute Radio Frequency Channel Number

[0121] SC-FDMA:Single Carrier-Frequency Division Multiple Access

[0122] MAC:Medium Access Control

[0123] The following is a description of the prior art associated with the present application. Unless otherwise specified, the meanings of the same terms in the specific embodiments are the same as in the prior art.

[0124] It is worth pointing out that the V2X referred to in the present application is the same as the sidelink. The V2X in the text can also represent the sidelink; similarly, the sidelink in the text can also represent the V2X, which will not be specifically distinguished and limited hereinafter.

[0125] The resource allocation manner of V2X (sidelink) communication in the specification of the application can be replaced by the transmission mode of V2X (sidelink) communication. The resource allocation manner referred to in the specification can represent the transmission mode, and the transmission mode referred to can represent the resource allocation manner. In NR sidelink communication, transmission mode 1 represents a base station scheduling-based transmission mode (resource allocation manner); transmission mode 2 represents a user equipment sensing and resource selection-based transmission mode (resource allocation manner).

[0126] The PSCCH in the specification of the application is used to carry SCI. The PSCCH referred to in the specification of the application corresponds to, or corresponds to, or is related to, or is scheduled PSSCH, which has the same meaning, all of which represent associated PSSCH or corresponding PSSCH. Similarly, the SCI (including first-level SCI and second-level SCI) referred to in the specification corresponds to, or corresponds to, or is related to, which has the same meaning, all of which represent associated SCI or corresponding SCI. It is worth pointing out that the first-level SCI is called 1st stage SCI or SCI format 0-1, which is transmitted in the PSCCH; the second-level SCI is called 2nd stage SCI or SCI format 0-2, which is transmitted in the corresponding PSSCH resource.

[0127] The selected sidelink communication resource referred to in the specification of the application also represents a selected sidelink grant, and the application does not make any limitation on this.

[0128] The high layer and the upper layer in the specification of the application can refer to the medium access control layer MAC layer, or other layers, and the application does not make any limitation on this.

[0129] Scenarios of sidelink communication

[0130] 1) Out-of-Coverage sidelink: Both UEs performing sidelink communication have no network coverage (for example, a UE detects no cell meeting the "cell selection criterion" on the frequency on which sidelink communication needs to be performed, indicating that the UE has no network coverage).

[0131] 2) In-Coverage sidelink: both UEs performing sidelink communication have network coverage (e.g., a UE detects at least one cell satisfying "cell selection criteria" on the frequency on which sidelink communication is needed, indicating that the UE has network coverage).

[0132] 3) Partial-Coverage sidelink: one of the UEs performing sidelink communication has no network coverage, and the other UE has network coverage.

[0133] From the perspective of a UE, there are only two scenarios: no network coverage and in-coverage. Partial-Coverage is described from the perspective of sidelink communication.

[0134] Basic procedure of LTE V2X (sidelink) communication

[0135] Figure 1 is a schematic diagram showing sidelink communication of LTE V2X UEs. First, UE1 sends sidelink communication control information (SCI format 1) to UE2, which is carried by physical layer channel PSCCH. SCI format 1 contains scheduling information of PSSCH, such as frequency domain resource of PSSCH, etc. Second, UE1 sends sidelink communication data to UE2, which is carried by physical layer channel PSSCH. PSCCH and corresponding PSSCH use frequency division multiplexing, i.e., PSCCH and corresponding PSSCH are located on the same subframe in time domain and on different RBs in frequency domain. In LTE V2X, one transport block (TB) can contain only one initial transmission, or one initial transmission and one blind retransmission (i.e., retransmission without HARQ feedback).

[0136] The specific design of PSCCH and PSSCH is as follows:

[0137] 1) PSCCH occupies one subframe in time domain and two consecutive RBs in frequency domain. The initialization of scrambling sequence uses a predefined value 510. SCI format 1 can be carried in PSCCH, wherein SCI format 1 contains at least frequency domain resource information of PSSCH. For example, for frequency domain resource indication field, SCI format 1 indicates the starting sub-channel number and the number of consecutive sub-channels of PSSCH corresponding to the PSCCH.

[0138] 2) PSSCH occupies one subframe in time domain, and the corresponding PSCCH adopts frequency division multiplexing (FDM). The PSSCH occupies one or more continuous sub-channels in the frequency domain, and the sub-channel represents n subCHsize RBs in the frequency domain subCHsize The starting sub-channel and the number of continuous sub-channels are indicated by the frequency domain resource indication field of the SCI format 1, which is configured by the RRC parameter.

[0139] Resource allocation mode of LTE V2X (Transmission Mode 3 / 4)

[0140] Figure 2 Two resource allocation modes of LTE V2X are shown, which are respectively referred to as base station scheduling-based resource allocation (Transmission Mode 3) and UE sensing-based resource allocation (Transmission Mode 4). In NR sidelink communication, the transmission mode 3 of LTE V2X corresponds to the transmission mode 1 in NR V2X, which is a base station scheduling-based transmission mode; the transmission mode 4 of LTE V2X corresponds to the transmission mode 2 in NR V2X, which is a UE sensing-based transmission mode. In LTE V2X, when there is eNB network coverage, the base station can configure the resource allocation mode of the UE, or the transmission mode of the UE, through UE-level dedicated RRC signaling SL-V2X-ConfigDedicated, which is specifically:

[0141] 1) Transmission Mode 3: Transmission Mode 3 means that the frequency domain resource used for sidelink communication is scheduled by the base station. Transmission Mode 3 contains two scheduling modes, dynamic scheduling and semi-persistent scheduling (SPS). For dynamic scheduling, the frequency domain resource of PSSCH is included in UL grant (DCI format 5A), and the CRC of PDCCH or EPDCCH carrying DCI format 5A is scrambled by SL-V-RNTI. For SPS semi-persistent scheduling, the base station configures one or more (up to 8) configured scheduling grants through IE: SPS-ConfigSL-r14, each configured scheduling grant contains a scheduling grant index and a resource period of the scheduling grant. The frequency domain resource of PSSCH is included in UL grant (DCI format 5A), and the indication information of scheduling grant index (3 bits) and the indication information of SPS activation or release (or deactivation). The CRC of PDCCH or EPDCCH carrying DCI format 5A is scrambled by SL-SPS-V-RNTI.

[0142] Specifically, when the RRC signaling SL-V2X-ConfigDedicated is set to scheduled-r14, it means that the UE is configured to be in the transmission mode based on the base station scheduling. The base station configures SL-V-RNTI or SL-SPS-V-RNTI through RRC signaling, and sends uplink scheduling grant UL grant to the UE through PDCCH or EPDCCH (DCI format 5A, CRC scrambled by SL-V-RNTI or scrambled by SL-SPS-V-RNTI). The above-mentioned uplink scheduling grant UL grant at least contains the scheduling information of the frequency domain resource of PSSCH in sidelink communication. After the UE successfully monitors the PDCCH or EPDCCH scrambled by SL-V-RNTI or SL-SPS-V-RNTI, the PSSCH frequency domain resource indication field in the uplink scheduling grant UL grant (DCI format 5A) is used as the indication information of the frequency domain resource of PSSCH in PSCCH (SCI format 1), and PSCCH (SCI format 1) and the corresponding PSSCH are sent.

[0143] For semi-persistent scheduling (SPS) in transmission mode 3, a UE receives a DCI format 5A scrambled with SL-SPS-V-RNTI on a downlink subframe n. If an indication of SPS activation is included in the DCI format 5A, the UE determines the frequency domain resource of PSSCH according to the indication in the DCI format 5A, and determines the time domain resource (transmission subframes of PSSCH) of PSSCH according to the information of subframe n, etc.

[0144] 2) UE sensing based resource allocation (Transmission Mode 4): UE sensing based resource allocation means that the resources for sidelink communication are based on the sensing procedure of UE. When the RRC signaling SL-V2X-ConfigDedicated is set as ue-Selected-r14, it means that the UE is configured as UE sensing based transmission mode. In the UE sensing based transmission mode, the base station configures a transmission resource pool, and the UE determines the sidelink transmission resource of PSSCH in the transmission resource pool according to certain rules (see the description of LTE V2X UE sensing procedure part for details), and sends PSCCH (SCI format 1) and corresponding PSSCH.

[0145] Sidelink resource pool

[0146] In sidelink communication, the transmission and reception resources of UE belong to resource pool. For example, for the base station scheduling based transmission mode in sidelink communication, the base station schedules transmission resources for sidelink UE in the resource pool, or for the UE sensing based transmission mode in sidelink communication, the UE determines the transmission resources in the resource pool.

[0147] Numerology in NR (including NR sidelink) and slot / subframe in NR (including NR sidelink) slot

[0148] The numerology parameter set contains two aspects of subcarrier spacing and cyclic prefix (CP) length. NR supports five subcarrier spacings, 15k, 30k, 60k, 120k, and 240kHz (corresponding to μ = 0, 1, 2, 3, 4), respectively. Table 4.2-1 shows the supported transmission numerology, as follows.

[0149] Table 4.2-1 NR supported subcarrier spacing

[0150] μ Δf = 2 μ · 15 [kHz] ] > CP (cyclic prefix) 0 15 Normal 1 30 Normal 2 60 Normal, extended 3 120 Normal 4 240 Normal

[0151] Extended CP is supported only when μ = 2, i.e. 60 kHz subcarrier spacing, and normal CP is supported for other subcarrier spacings. For normal CP, each slot contains 14 OFDM symbols; for extended CP, each slot contains 12 OFDM symbols. For μ = 0, i.e. 15 kHz subcarrier spacing, 1 slot = 1 ms; for μ = 1, i.e. 30 kHz subcarrier spacing, 1 slot = 0.5 ms; for μ = 2, i.e. 60 kHz subcarrier spacing, 1 slot = 0.25 ms, and so on.

[0152] NR and LTE have the same definition of subframe, which represents 1 ms. For a subcarrier spacing configuration μ, the slot number within 1 ms (1 subframe) can be expressed as ranging from 0 to The slot number within 1 system frame (10 ms) can be expressed as ranging from 0 to where and The definitions for different subcarrier spacing μ are shown in the following table.

[0153] Table 4.3.2-1: Number of symbols contained in each slot, number of slots contained in each system frame, number of slots contained in each subframe for normal CP

[0154]

[0155] Table 4.3.2-2: Number of symbols contained in each slot, number of slots contained in each system frame, number of slots contained in each subframe for extended CP (60 kHz)

[0156]

[0157] On an NR carrier, the number of system frame (or, simply, frame) SFN ranges from 0 to 1023. The concept of direct frame number DFN is introduced in sidelink, with the same range of 0 to 1023. The above description of the relationship between system frame and numerology can also be applied to direct frame, e.g. the duration of one direct frame is also equal to 10 ms, for 15 kHz subcarrier spacing, one direct frame includes 10 slots, and so on. DFN is applied to timing on sidelink carrier.

[0158] Numerology in LTE (including LTE V2X) and slot / subframe in LTE (including LTE V2X)

[0159] LTE only supports 15 kHz subcarrier spacing. LTE supports both normal CP and extended CP. A subframe has a duration of 1 ms and contains two slots, each of 0.5 ms.

[0160] For normal CP, each subframe contains 14 OFDM symbols, and each slot in a subframe contains 7 OFDM symbols; for extended CP, each subframe contains 12 OFDM symbols, and each slot in a subframe contains 6 OFDM symbols.

[0161] Resource block (RB) and resource element (RE)

[0162] A resource block (RB) is defined in the frequency domain as contiguous subcarriers, for example, for a subcarrier spacing of 15 kHz, a RB is 180 kHz in the frequency domain. For a subcarrier spacing of 15 kHz x 2 μ A resource element (RE) represents 1 subcarrier x 1 OFDM symbol in the frequency domain.

[0163] NR sidelink resource allocation mode 2 and resource re-evaluation

[0164] In the 5G NR V2X topic, a resource allocation mode 2, also known as transmission mode 2, is supported, which is based on user equipment sensing. In the resource allocation mode 2, the physical layer of the user equipment senses the transmission resources in the resource pool and reports a set of available transmission resources to the upper layer. After obtaining the report of the physical layer, the upper layer selects the resources for the sidelink transmission, or selects the sidelink scheduling grant.

[0165] In the resource allocation mode 2, re-evaluation of the transmission resources selected by the upper layer is supported, i.e., before the time of the transmission resources arrives, the selected transmission resources are sensed again to determine whether the transmission resources are still available.

[0166] The sensing performed by the physical layer triggered by the upper layer can also be referred to as the upper layer requesting the physical layer to determine a subset of resources in which the upper layer selects the sidelink resources for PSSCH / PSCCH transmission.

[0167] Processing delay of resource allocation mode 2 in NR sidelink

[0168] In the specification of the present application, at least two processing delays are involved: and and The values ​​of are shown below, where μ SL Information indicating the subcarrier spacing for side-to-side communication.

[0169] Table 1: The value of

[0170]

[0171] Table 2: The value of

[0172]

[0173] The following provides a detailed description of specific examples and embodiments related to this invention. Furthermore, as described above, the examples and embodiments described in this disclosure are illustrative and intended to facilitate understanding of the invention, and are not intended to limit the scope of the invention.

[0174] [Example 1]

[0175] Figure 3 This is a schematic diagram illustrating the basic process of a method executed by a user equipment according to Embodiment 1 of the present invention.

[0176] Below, in conjunction with Figure 3 The basic process diagram shown illustrates in detail the method executed by a user equipment according to Embodiment 1 of the present invention.

[0177] like Figure 3 As shown, in Embodiment 1 of the present invention, the steps performed by the user equipment include:

[0178] In step S101, optionally, the higher layer (or upper layer) of the side-link communication user equipment requests the physical layer to determine a subset of side-link communication resources.

[0179] in,

[0180] The higher layer (or upper layer) selects side-link communication resources from the subset of side-link communication resources, optionally for the transmission of the Physical Side-link Communication Shared Channel (PSSCH) and the Physical Side-link Communication Control Channel (PSCCH).

[0181] as well as,

[0182] Optionally, the selected sidelink resource is referred to as a selected sidelink grant.

[0183] Optionally, the high layer requests (or, triggers) the process of determining the subset of sidelink resources at time slot slot n.

[0184] At step S102, the user equipment performs re-evaluation.

[0185] wherein,

[0186] Optionally, the user equipment re-evaluates one or more resources in the selected sidelink scheduling grant. Wherein, the user equipment signals at first time the one or more resources at time slot slot m.

[0187] Optionally, if the time slot slot n is earlier than the time slot slot m in time domain, then, the user equipment re-evaluates the one or more resources at time slot slot n. Wherein, represents the first processing delay.

[0188] [Embodiment Two]

[0189] Figure 3 is a schematic diagram showing the basic process of the method performed by the user equipment according to Embodiment Two of the present application.

[0190] Hereinafter, the method performed by the user equipment according to Embodiment Two of the present application will be described in detail in combination with the basic process diagram shown in Figure 3 As shown in

[0191] , in Embodiment Two of the present application, the steps performed by the user equipment include: Figure 3 At step S101, optionally, a high layer (or, upper layer) of the sidelink user equipment requests a physical layer to determine a subset of sidelink resources.

[0192] wherein,

[0193] The high layer (or, upper layer) selects sidelink resources in the subset of sidelink resources, optionally, for transmission of a physical sidelink shared channel PSSCH and a physical sidelink control channel PSCCH,

[0194] and,

[0195]

[0196] Optionally, the selected sidelink resources are referred to as a selected sidelink scheduling grant.

[0197] ​​Optionally, the high layer requests (or triggers) the process of determining the subset of sidelink communication resources on time slot slot n.

[0198] At step S102, the user equipment performs re-evaluation.

[0199] wherein,

[0200] Optionally, the user equipment re-evaluates one or more resources in the selected sidelink communication scheduling grant. Wherein, the user equipment signals at first time the one or more resources on time slot slot m.

[0201] Optionally, if the time slot slot n is later (or equal to) than the time slot in time domain, the user equipment does not re-evaluate the one or more resources.

[0202] [Embodiment Three]

[0203] Figure 4 is a schematic diagram showing the basic process of the method performed by the user equipment according to Embodiment Three of the present application.

[0204] Hereinafter, the method performed by the user equipment according to Embodiment Three of the present application will be described in detail with reference to the basic process diagram shown in Figure 4

[0205] As shown in Figure 4 , in Embodiment Three of the present application, the steps performed by the user equipment include:

[0206] At step S201, the high layer (for the physical layer) of the user equipment provides parameters for PSSCH / PSCCH transmission.

[0207] wherein,

[0208] Optionally, the user equipment provides the parameters for PSSCH / PSCCH transmission on time slot slot n.

[0209] Optionally, the resource allocation manner of the user equipment is a user equipment sensing based resource allocation manner.

[0210] Optionally, the parameters for PSSCH / PSCCH transmission at least include the number L of sub-channels used for PSSCH / PSCCH transmission. subCH .

[0211] ​In step S202, the user equipment determines (or identifies) candidate resources.

[0212] Optionally, a candidate single-slot resource is defined as any slot in the resource pool. The L mentioned above subCH A continuous subchannel; and, optionally, the user equipment assumes (or assumes) that within the time interval [the n+T1, the n+T2], any L contained in the resource pool (in any time slot) subCH Each consecutive subchannel corresponds to a single time slot candidate resource, and, except for the time interval [the n+T1, the [The single-slot candidate resources within the specified time interval. Where T1 represents the first time interval, T2 represents the second time interval,] Indicates the first processing delay, and, optionally,

[0213] [Example 4]

[0214] Figure 4 This is a schematic diagram illustrating the basic process of a method executed by a user equipment according to Embodiment 4 of the present invention.

[0215] Below, in conjunction with Figure 4 The basic process diagram shown illustrates in detail the method executed by the user equipment in Embodiment 4 of the present invention.

[0216] like Figure 4 As shown, in Embodiment 4 of the present invention, the steps performed by the user equipment include:

[0217] In step S201, the higher layer (physical layer) of the user equipment provides parameters for PSSCH / PSCCH transmission.

[0218] in,

[0219] Optionally, the user equipment provides the parameters for PSSCH / PSCCH transmission on slot n.

[0220] Optionally, the resource allocation method of the user equipment is a resource allocation method based on user equipment awareness.

[0221] Optionally, the parameters for PSSCH / PSCCH transmission include at least the number L of sub-channels used for PSSCH / PSCCH transmission. subCH .

[0222] In step S202, the user equipment determines (or identifies) candidate resources.

[0223] Optionally, a candidate single-slot resource is defined as any slot in the resource pool. The L mentioned above subCH A series of consecutive sub-channels; and, optionally, the user equipment assumes (or assumes) that in the time interval [the Within the range of [n+T2], any L contained in the resource pool (in any time slot) subCH Each consecutive sub-channel corresponds to a single time slot candidate resource, where T2 represents the first time interval. This indicates the delay in the first processing step.

[0224] Figure 5 This is a block diagram illustrating the user equipment (UE) involved in this invention. For example... Figure 5 As 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, volatile memory (such as random access memory, RAM), a hard disk drive (HDD), non-volatile memory (such as flash memory), or other memory. Program instructions are stored on the memory 802. When executed by the processor 801, these instructions can perform the methods described in detail herein, executed by the user equipment.

[0225] The method and related apparatus of the present invention have been described above in conjunction with preferred embodiments. Those skilled in the art will understand that the methods shown above are merely exemplary, and the various 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 nodes and user equipment shown above may include more modules, such as modules that can be developed or will be developed in the future for use with base stations, MMEs, or UEs, etc. The various identifiers shown above are merely exemplary and not limiting, and the present invention is not limited to the specific information elements exemplified by these identifiers. Those skilled in the art can make many variations and modifications based on the teachings of the illustrated embodiments.

[0226] It should be understood that the above-described embodiments of the present application can be implemented by software, hardware, or a combination thereof. For example, various components in the above-described embodiments of the base station and the user equipment can be implemented by a variety of means, including, but not limited to, analog circuit means, digital circuit means, digital signal processor (DSP) circuit means, a programmable processor, an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), a programmable logic device (CPLD), and the like.

[0227] In the present application, the "base station" can refer to a mobile communication data and control switching center with a large transmission power and a wide coverage area, including functions of resource allocation scheduling, data receiving and sending, and the like. The "user equipment" can refer to a user mobile terminal, such as a mobile phone, a notebook, and the like, which can perform wireless communication with the base station or the micro base station.

[0228] Furthermore, the embodiments of the present application disclosed herein can be implemented in a computer program product. More specifically, the computer program product is a product having a computer readable medium having encoded thereon computer program logic, which, when executed on a computing device, provides related operations to implement the above-described technical solutions of the present application. 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 application. Such a configuration of the present application is typically provided as software, code and / or other data structures, or other media such as firmware or microcode on one or more ROM or RAM or PROM chips, or as downloadable software images, shared databases, or the like in one or more modules, or the like, which are installed on a computing device to cause one or more processors in the computing device to perform the technical solutions described in the embodiments of the present application.

[0229] Furthermore, each functional block or each feature of the base station device and the terminal device used in each of the above-described embodiments can be implemented as an electronic circuit that does not necessarily have independence as a unit. In other words, in some cases, a plurality of functional blocks or functional elements described in the above-described embodiments as units can be configured as hardware that is integrated in the electronic circuit. In this case, the electronic circuit is treated as a plurality of functional blocks or a plurality of functional elements described in the above-described embodiments.

[0230] While the present application has been shown and described with reference to the preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details can be made therein without departing from the spirit and scope of the application. Therefore, the present application should not be defined with the only preferred embodiments but with the appended claims and their equivalents.

Claims

1.A method performed by a user equipment, comprising: a higher layer or upper layer of the user equipment requesting a physical layer to determine a subset of sidelink communication resources; the higher layer or upper layer requesting or triggering the process of determining the subset of sidelink communication resources on a time slot slot n, the user equipment selecting a sidelink communication resource in the subset of sidelink communication resources on the time slot slot n, the user equipment first indicating one or more of the sidelink communication resources on a time slot slot m, The user equipment determines whether to re-evaluate the one or more resources according to a relationship between the time slot slot n and the time slot slot m, including: if the time slot slot n is earlier than the time slot slot m in time domain- , the user equipment re-evaluates the one or more resources, if the time slot slot n is later than or equal to the time slot slot m in time domain- , the user equipment does not re-evaluate the one or more resources, A single-slot candidate resource is defined as one contiguous subchannel on any one slot in the resource pool ​​ The user equipment considers that in the time interval [n+T1, n+T2], any of the continuous sub-channels contained in the resource pool corresponds to a single-slot candidate resource, ​ wherein T2 represents a first time interval, represents a first processing delay. 2.The method of claim 1, wherein, the selected sidelink communication resource is a selected sidelink communication scheduling grant. 3.A user equipment, comprising: a processor; and a memory storing instructions; wherein the instructions, when executed by the processor, perform the method of claim 1 or 2. ​

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