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: a high layer requests or triggers the user equipment to determine a transmission resource of a PSSCH / PSCCH; the user equipment determines a candidate time slot set; and the user equipment determines a time slot set to be listened.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, and more particularly to a method performed by a user equipment and a corresponding user equipment. Background Technology

[0002] In traditional cellular networks, all communication must pass through a base station. In contrast, D2D (Device-to-Device) communication refers to direct communication between two user devices without the need for 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 implementing proximity D2D communication services using LTE equipment was approved (see Non-Patent Literature 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 function between nearby devices;

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

[0006] At the 3GPP RAN#66 plenary meeting in December 2014, the research project on enhanced LTE eD2D was approved (see Non-Patent Literature 2). The main features introduced by LTE Release 13 eD2D include:

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

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

[0009] Based on the D2D communication mechanism, a feasibility study for V2X based on D2D communication was approved at the 3GPP RAN#68 plenary meeting in June 2015. V2X stands for Vehicle to Everything, aiming to enable vehicles to interact with all entities that might affect them, with the goal of reducing accidents, alleviating traffic congestion, reducing environmental pollution, and providing other information services. The main application scenarios of V2X include four aspects:

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

[0011] 2) V2P, Vehicle to Pedestrian, refers to vehicles sending warnings to pedestrians or non-motorized vehicles;

[0012] 3) V2N, Vehicle to Network, refers to vehicles connecting to mobile networks;

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

[0014] 3GPP divides V2X research and standardization work into three phases. The first phase, completed in September 2016, primarily focused on V2V, based on LTE Release 12 and Release 13 D2D (also known as sidelink communication), i.e., the development of proximity communication technology (see Non-Patent Document 3). V2X stage 1 introduced a new D2D communication interface called the PC5 interface. The PC5 interface is mainly used to solve the communication problems of cellular vehicle 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, meaning vehicles can communicate directly with each other via the PC5 interface. Compared to 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) Introduce sub-channels to enhance resource allocation methods;

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

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

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

[0020] In the 5G NR V2X project, a user equipment-sensing-based resource allocation mode 2 (or transmission mode 2) is supported. In resource allocation mode 2, the user equipment's physical layer senses the transmission resources within the resource pool and reports the set of available transmission resources to the upper layer. After receiving the report from the physical layer, the upper layer (Media Access Control (MAC) layer) selects resources for sideline communication transmission.

[0021] In 5G NR V2X, a pre-emption check mechanism is supported. This means that after the MAC layer selects resources for sideline communication transmission, it will at some future time re-evaluate the selected transmission resources to determine whether they have been reserved or preempted by other user equipment. If the transmission resource has been reserved or preempted by another user equipment, the MAC layer can trigger resource reselection to replace the preempted transmission resource.

[0022] At the 3GPP RAN#90e plenary meeting in December 2020, a standardization research project on NR sidelink enhancement (see Non-Patent Document 6) was approved. The sidelink enhancement includes the following two aspects:

[0023] 1) Standardize resource allocation methods to reduce power consumption of user equipment in side-line communication, including but not limited to: resource allocation methods based on partial sensing and resource allocation methods based on random resource selection;

[0024] 2) Research on improving the communication reliability of resource allocation method 2 in NR side-by-side communication and reducing the communication latency of resource allocation method 2.

[0025] The solution of this patent includes a method for a side-by-side communication user equipment to determine the set of time slots that need to be monitored for resources provided by the MAC layer for preemption checks in a partially aware resource allocation method, in side-by-side communication enhancement.

[0026] Existing technical documents

[0027] Non-patent literature

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

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

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

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

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

[0033] Non-Patent Literature 6: RP-202846, WID revision: NR sidelink enhancement Summary of the Invention

[0034] To address at least some of the above-mentioned problems, the present invention provides a method performed by a user equipment and a user equipment thereof.

[0035] A method performed by a user equipment according to a first aspect of the present invention includes: a higher layer requesting or triggering the user equipment to determine the transmission resources of PSSCH / PSCCH; the user equipment determining a candidate time slot set; and the user equipment determining a set of time slots to monitor.

[0036] According to a first aspect of the present invention, the method performed by a user equipment is a resource allocation method based on partial awareness.

[0037] According to a method performed by a user equipment according to a first aspect of the invention, the higher layer requests the user equipment to determine the transmission resources of PSSCH / PSCCH on slot n.

[0038] According to a method performed by a user equipment according to a first aspect of the present invention, the higher layer provides a resource set (r0′, r1′, r2′, ...) on the time slot n, the resource set (r0′, r1′, r2′, ...) belonging to resources subject to preemption checks, and the time slots in which the resource set (r0′, r1′, r2′, ...) reside in the time domain are respectively represented as time slot sets.

[0039] According to a method performed by a user equipment according to a first aspect of the present invention, the user equipment determines the candidate time slot set in a manner that depends on the implementation of the user equipment.

[0040] According to a method performed by a user equipment according to a first aspect of the present invention, the user equipment determines the candidate time slot set in a resource selection window.

[0041] According to a method performed by a user equipment according to a first aspect of the present invention, the candidate time slot set includes at least the time slot set.

[0042] According to a first aspect of the invention, a method performed by a user equipment, the user equipment in a time slot The above indicates or reserves any one of the side-line communication resources r from the resource set (r0′, r1′, r2′, ...). i ′.

[0043] According to a first aspect of the invention, a method performed by a user equipment for any one of the candidate time slot sets... If the time slot Not included in the time slot set In this context, the set of time slots monitored by the user equipment includes at least the following: Any time slot of and; if the time slot Included in the time slot set In this context, the set of time slots monitored by the user equipment includes at least the following: In addition to the time slots mentioned above In any time slot other than P, reserve And the k is determined by the configuration or pre-configured information of the side-by-side communication, or the P reserve It represents a subset or the entire set of all resource reservation periods included in the side-link communication resource pool configuration information, where k represents one or more positive integers.

[0044] 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.

[0045] Beneficial effects of the present invention

[0046] According to the solution of this patent, in the NR side-link communication enhancement, firstly, it can effectively ensure that the resources provided by the MAC layer for preemption checking can become one of the candidate time slots for re-sensing, thereby improving the transmission reliability of side-link communication; secondly, it can reduce the set of time slots that side-link communication user equipment needs to listen to, thereby reducing the power consumption of side-link communication. Attached Figure Description

[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, wherein:

[0048] Figure 1 This is a schematic diagram illustrating LTE V2X UE side-by-side communication.

[0049] Figure 2 This is a schematic diagram illustrating the resource allocation method of LTE V2X.

[0050] Figure 3 This is a schematic diagram illustrating the basic process of a method performed by a user device in Embodiment 1 of the invention.

[0051] Figure 4 This is a block diagram illustrating a user equipment according to an embodiment of the present invention. Detailed Implementation

[0052] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. It should be noted that the present invention should not be limited to the specific embodiments described below. Furthermore, for the sake of simplicity, detailed descriptions of well-known technologies not directly related to the present invention have been omitted to prevent confusion in understanding the present invention.

[0053] The following description uses 5G mobile communication systems and their subsequent evolutions as example application environments to specifically describe several embodiments according to the present invention. However, it should be noted that the present invention is not limited to the following embodiments, but is applicable to many other wireless communication systems, such as communication systems after 5G and 4G mobile communication systems before 5G.

[0054] The following describes some of the terms involved in this invention. Unless otherwise specified, the terms used in this invention are as defined herein. The terms given in this invention may be named differently in LTE, LTE-Advanced, LTE-Advanced Pro, NR and later communication systems, but a unified terminology is used in this invention. When applied to a specific system, it can be replaced with the terminology used in the corresponding system.

[0055] 3GPP: 3rd Generation Partnership Project

[0056] LTE: Long Term Evolution

[0057] NR: New Radio, New Wireless, New Air Interface

[0058] PDCCH: Physical Downlink Control Channel

[0059] DCI: Downlink Control Information

[0060] PDSCH: Physical Downlink Shared Channel

[0061] UE: User Equipment

[0062] eNB: evolved NodeB

[0063] gNB: NR base station

[0064] TTI: Transmission Time Interval

[0065] OFDM: Orthogonal Frequency Division Multiplexing

[0066] CP-OFDM: Cyclic Prefix Orthogonal Frequency Division Multiplexing

[0067] C-RNTI: Cell Radio Network Temporary Identifier

[0068] CSI: Channel State Information

[0069] HARQ: Hybrid Automatic Repeat Request.

[0070] CSI-RS: Channel State Information Reference Signal

[0071] CRS: Cell Reference Signal

[0072] PUCCH: Physical Uplink Control Channel

[0073] PUSCH: Physical Uplink Shared Channel

[0074] UL-SCH: Uplink Shared Channel

[0075] CG: Configured Grant

[0076] Sidelink: Side-link communication

[0077] SCI: Sidelink Control Information

[0078] PSCCH: Physical Sidelink Control Channel

[0079] MCS: Modulation and Coding Scheme

[0080] RB: Resource Block

[0081] RE: Resource Element

[0082] CRB: Common Resource Block

[0083] CP: Cyclic Prefix

[0084] PRB: Physical Resource Block

[0085] PSSCH: Physical Sidelink Shared Channel

[0086] FDM: Frequency Division Multiplexing

[0087] RRC: Radio Resource Control

[0088] RSRP: Reference Signal Receiving Power

[0089] SRS: Sounding Reference Signal

[0090] DMRS: Demodulation Reference Signal

[0091] CRC: Cyclic Redundancy Check

[0092] PSDCH: Physical Sidelink Discovery Channel

[0093] PSBCH: Physical Sidelink Broadcast Channel

[0094] SFI: Slot Format Indication

[0095] TDD: Time Division Duplexing

[0096] FDD: Frequency Division Duplexing

[0097] SIB1: System Information Block Type 1

[0098] SLSS: Sidelink synchronization signal

[0099] PSSS: Primary Sidelink Synchronization Signal

[0100] SSSS: Secondary Sidelink Synchronization Signal

[0101] PCI: Physical Cell ID

[0102] PSS: Primary Synchronization Signal

[0103] SSS: Secondary Synchronization Signal

[0104] BWP: Bandwidth Part

[0105] GNSS: Global Navigation Satellite System

[0106] SFN: System Frame Number

[0107] DFN: Direct Frame Number

[0108] IE: Information Element

[0109] SSB: Synchronization Signal Block

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

[0111] MCG: Master Cell Group

[0112] SCG: Secondary Cell Group

[0113] PCell: Primary Cell

[0114] SCell: Secondary Cell

[0115] PSFCH: Physical Sidelink Feedback Channel

[0116] SPS: Semi-Persistant Scheduling

[0117] TA: Timing Advance, uplink timing advance

[0118] PT-RS: Phase-Tracking Reference Signals

[0119] TB: Transport Block

[0120] CB: Code Block

[0121] QPSK: Quadrature Phase Shift Keying

[0122] 16 / 64 / 256QAM: 16 / 64 / 256 Quadrature Amplitude Modulation.

[0123] AGC: Auto Gain Control

[0124] TDRA (field): Time Domain Resource Assignment.

[0125] FDRA (field): Frequency Domain Resource Assignment.

[0126] ARFCN: Absolute Radio Frequency Channel Number

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

[0128] MAC: Medium Access Control.

[0129] The following is a description of prior art associated with the present invention. Unless otherwise specified, the same terms in the specific embodiments have the same meaning as in the prior art.

[0130] It is worth noting that V2X and sidelink have the same meaning in this specification. V2X can also mean sidelink in this document; similarly, sidelink can also mean V2X, and no specific distinction or limitation will be made thereafter.

[0131] The resource allocation method for V2X (sidelink) communication and the transmission mode for V2X (sidelink) communication in this specification can be used interchangeably. The resource allocation method mentioned in the specification can represent a transmission mode, and vice versa. In NR sidelink 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.

[0132] In this invention's specification, the PSCCH is used to carry SCIs. The terms "corresponding to," "related to," "related to," or "scheduled to" PSSCH used in this specification all have the same meaning: associated PSSCH or corresponding PSSCH. Similarly, the terms "corresponding to," "related to," or "related to" SCIs (including first-level SCIs and second-level SCIs) used in this specification all have the same meaning: associated SCI or corresponding SCI. It is worth noting that the first-level SCI is called the 1st-stage SCI or SCI format 1-A, and is transmitted in the PSCCH; the second-level SCI is called the 2nd-stage SCI or SCI format 2-A (or SCI format 2-B), and is transmitted in the resources of the corresponding PSSCH.

[0133] Sidelink communication scenarios

[0134] 1) Out-of-Coverage sidelink communication: Neither of the two UEs conducting sidelink communication has network coverage (for example, if the UE cannot detect any cells that meet the "cell selection criteria" on the frequency where sidelink communication is required, it means that the UE has no network coverage).

[0135] 2) In-Coverage Sidelink Communication: Both UEs performing sidelink communication have network coverage (for example, if a UE detects at least one cell that meets the "cell selection criteria" on the frequency where sidelink communication is required, it means that the UE has network coverage).

[0136] 3) Partial-Coverage Sidelink Communication: One UE in the sidelink communication has no network coverage, while the other UE has network coverage.

[0137] From the UE's perspective, this UE only has two scenarios: no network coverage and network coverage. Partial network coverage is described from the perspective of sidelink communication.

[0138] Basic process of LTE V2X (sidelink) communication

[0139] Figure 1This diagram illustrates LTE V2X UE side-by-side communication. First, UE1 sends side-by-side communication control information (SCI format 1) to UE2, carried by the physical layer channel PSCCH. SCI format 1 contains PSSCH scheduling information, such as PSSCH frequency domain resources. Second, UE1 sends side-by-side communication data to UE2, carried by the physical layer channel PSSCH. The PSCCH and the corresponding PSSCH use frequency division multiplexing, meaning the PSCCH and the corresponding PSSCH are located on the same subframe in the time domain but on different RBs in the frequency domain. In LTE V2X, a transport block (TB) may contain only one initial transmission, or it may contain one initial transmission and one blind retransmission (meaning a retransmission not based on HARQ feedback).

[0140] The specific design methods for PSCCH and PSSCH are as follows:

[0141] 1) The PSCCH occupies one subframe in the time domain and two consecutive RBs in the frequency domain. The scrambling sequence is initialized with a predefined value of 510. The PSCCH can carry SCI format 1, which contains at least the frequency domain resource information of the PSCCH. For example, for the frequency domain resource indication field, SCI format 1 indicates the starting sub-channel number and the number of consecutive sub-channels of the PSCCH corresponding to that PSCCH.

[0142] 2) The PSSCH occupies one subframe in the time domain and uses frequency division multiplexing (FDM) with the corresponding PSCCH. The PSSCH occupies one or more consecutive sub-channels in the frequency domain, where each sub-channel represents n in the frequency domain. subCHsize A series of RBs, n subCHsize Configured by RRC parameters, the number of the starting sub-channel and the number of consecutive sub-channels are indicated by the frequency domain resource indication field of SCI format 1.

[0143] LTE V2X resource allocation method: Transmission Mode 3 / 4

[0144] Figure 2This illustrates two resource allocation methods for LTE V2X, referred to as base station scheduling-based resource allocation (Transmission Mode 3) and UE-sensing-based resource allocation (Transmission Mode 4). In NR side-channel communication, LTE V2X transmission mode 3 corresponds to NR V2X transmission mode 1, which is a base station scheduling-based transmission mode; LTE V2X transmission mode 4 corresponds to NR V2X transmission mode 2, which is a UE-sensing-based transmission mode. In LTE V2X, when eNB network coverage is available, the base station can configure the UE's resource allocation method, or transmission mode, through the UE-level dedicated RRC signaling SL-V2X-ConfigDedicated, specifically as follows:

[0145] 1) Base Station Scheduling-Based Resource Allocation (Transmission Mode 3): This method indicates that the frequency domain resources used for sidelink communication are allocated by the base station. Transmission Mode 3 includes two scheduling methods: dynamic scheduling and semi-static scheduling (SPS). For dynamic scheduling, the UL grant (DCI format 5A) includes the frequency domain resources of the PSSCH, and the CRC of the PDCCH or EPDCCH carrying DCI format 5A is scrambled by SL-V-RNTI. For SPS semi-static scheduling, the base station configures one or more (up to eight) configured grants via IE:SPS-ConfigSL-r14. Each configured grant contains a grant number (index) and the resource period of the grant. The UL grant (DCI format 5A) includes the frequency domain resources of the PSSCH, as well as indication information (3 bits) of the grant number and indication information for SPS activation or release (or deactivation). The CRC of the PDCCH or EPDCCH carrying DCI format 5A is scrambled by SL-SPS-V-RNTI.

[0146] Specifically, when the RRC signaling SL-V2X-ConfigDedicated is set to scheduled-rl4, it indicates that the UE is configured for base station-based transmission mode. The base station configures SL-V-RNTI or SL-SPS-V-RNTI via RRC signaling and sends an uplink scheduling grant (UL grant) to the UE via PDCCH or EPDCCH (DCI format 5A, CRC scrambled with SL-V-RNTI or SL-SPS-V-RNTI). The aforementioned uplink scheduling grant (UL grant) contains at least the scheduling information for PSSCH frequency domain resources in sidelink communication. When the UE successfully listens to the PDCCH or EPDCCH scrambled with SL-V-RNTI or SL-SPS-V-RNTI, it uses the PSSCH frequency domain resource indication field in the uplink scheduling grant (UL grant, DCI format 5A) as the indication information for the PSSCH frequency domain resources in the PSCCH (SCI format 1), and sends the PSCCH (SCI format 1) and the corresponding PSSCH.

[0147] For semi-static scheduling (SPS) in transmission mode 3, the UE receives SL-SPS-V-RNTI scrambled DCI format 5A on downlink subframe n. If DCI format 5A contains SPS activation indication information, the UE determines the frequency domain resources of PSSCH based on the indication information in DCI format 5A, and determines the time domain resources of PSSCH (PSSCH transmission subframe) based on information such as subframe n.

[0148] 2) UE-sensing-based resource allocation (Transmission Mode 4): UE-sensing-based resource allocation means that resources used for sidelink communication are allocated based on the UE's sensing process of a set of candidate available resources. When the RRC signaling SL-V2X-ConfigDedicated is set to ue-Selected-rl4, it indicates that the UE is configured for UE-sensing-based transmission mode. In UE-sensing-based transmission mode, the base station configures an available transmission resource pool. The UE determines the sidelink transmission resources for PSSCH in the transmission resource pool according to certain rules (see the LTE V2X UE sensing process section for a detailed description of the process), and transmits the PSCCH (SCI format 1) and the corresponding PSSCH.

[0149] Sidelink resource pool

[0150] In sidelink communication, the resources used for both transmission and reception by the UE belong to the resource pool. For example, in a base station-scheduled transmission mode in sidelink communication, the base station schedules transmission resources for the sidelink UE from the resource pool; or, in a UE-aware transmission mode in sidelink communication, the UE determines the transmission resources from the resource pool.

[0151] Resource allocation method based on (partial) perception

[0152] For resource allocation based on (partial) awareness, the side-link communication user equipment selects candidate resources within a time window. Based on the reserved resources indicated by the PSCCH sent by other user equipment in the listening time slot, it identifies candidate resources that overlap with the reserved resources and excludes these overlapping candidate resources. The physical layer reports the set of unexcluded candidate resources to the MAC layer, which then selects transmission resources for the PSSCH / PSCCH.

[0153] Resource selection window [n+T1, n+T2]

[0154] In the sensing-based (or partially sensing) resource allocation method, the higher layer requests or triggers the physical layer to determine the resources for PSSCH / PSCCH transmission on time slot n (performing sensing or partial sensing). The resource selection window is defined as [n+T1, n+T2], meaning the user equipment selects transmission resources within this window. Where T1 satisfies the condition... The choice of T1 depends on the user equipment implementation; the RRC configuration information contains a configuration list of resource selection windows, sl-SelectionWindowList, where each priority corresponds to a given priority. TX The element representing the priority of PSSCH transmission is T. 2min If the T 2min If the delay is less than the remaining packet delay budget (remaining PDB), then T2 satisfies condition T. 2min ≤T2≤remaining PDB, the choice of T2 depends on the implementation of the user device; otherwise, T2 is set to remaining PDB. The definition is as follows (μ) SL This represents the subcarrier spacing parameter for side-by-side communication, i.e., the subcarrier spacing is... ):

[0155] Table 8.1.4-2: The value of

[0156]

[0157] Table 8.1.4-1: The value of

[0158]

[0159]

[0160] Candidate single-slot resource R x，y (candidate single-slot resource)

[0161] A candidate single-slot resource R x，y Indicates in time slot upper continuous L subCH There are 10 sub-channels (denoted as x+j, where j = 0, 1, ..., L). subCH A set of -1). Where, This represents any slot from the candidate slot set in the resource selection window. L subCH This indicates the number of sub-channels provided by the higher layer (or upper layer) for PSSCH / PSCCH transmission.

[0162] The parameter set (numerology) in NR (including NR sidelinks) and the parameter set (numerology) in NR (including NR sidelinks) time slot

[0163] The parameter set numberology includes two aspects: subcarrier spacing and cyclic prefix (CP) length. NR supports five subcarrier spacings: 15kHz, 30kHz, 60kHz, 120kHz, and 240kHz (corresponding to μ = 0, 1, 2, 3, and 4). Table 4.2-1 shows the supported transmission parameter set, as detailed below.

[0164] Table 4.2-1 Subcarrier Spacing Supported by NR

[0165] 0 15 normal 1 30 normal 2 60 Normal, expansion 3 120 normal 4 240 normal

[0166] Extended CP is supported only when μ = 2, i.e., a 60kHz subcarrier spacing; other subcarrier spacings only support normal CP. For normal CP, each slot contains 14 OFDM symbols; for extended CP, each slot contains 12 OFDM symbols. For μ = 0 (15kHz subcarrier spacing), one slot = 1ms; for μ = 1 (30kHz subcarrier spacing), one slot = 0.5ms; for μ = 2 (60kHz subcarrier spacing), one slot = 0.25ms, and so on.

[0167] NR and LTE use the same definition for subframes, which is 1ms. For a subcarrier spacing configuration μ, the slot number within one subframe (1ms) can be represented as... The range is 0 to The slot number within a system frame (10ms in duration) can be represented as: The range is 0 to in, and The definitions for different subcarrier spacings μ are shown in the table below.

[0168] Table 4.3.2-1: Number of symbols per slot, number of slots per system frame, and number of slots per subframe during normal CP.

[0169]

[0170] Table 4.3.2-2: Number of symbols per slot, number of slots per system frame, and number of slots per subframe during extended CP (60kHz)

[0171]

[0172] On NR carriers, the System Frame Number (SFN) ranges from 0 to 1023. In sidelink communication, the concept of Direct System Frame Number (DFN) is introduced, also ranging from 0 to 1023. The above description of the relationship between system frames and numbers also applies to direct system frames. For example, a direct system frame has a duration of 10 ms, and for a subcarrier spacing of 15 kHz, a direct system frame includes 10 time slots, and so on. DFNs are used for timing on sidelink carriers.

[0173] Parameter sets in LTE (including LTE V2X) and time slots and subframes in LTE (including LTE V2X)

[0174] LTE only supports a subcarrier spacing of 15kHz. LTE supports both extended CP and normal CP. A subframe duration is 1ms, containing two slots, each with a duration of 0.5ms.

[0175] For Normal CP, each subframe contains 14 OFDM symbols, and each slot in the subframe contains 7 OFDM symbols; for Extended CP, each subframe contains 12 OFDM symbols, and each slot in the subframe contains 6 OFDM symbols.

[0176] Resource blocks (RBs) and resource units (REs)

[0177] Resource blocks (RBs) are defined in the frequency domain as For consecutive subcarriers, for example, with a subcarrier spacing of 15 kHz, RB is 180 kHz in the frequency domain. For a subcarrier spacing of 15 kHz × 2 μ Resource element (RE) represents one subcarrier in the frequency domain and one OFDM symbol in the time domain.

[0178] Pre-emption check in NR side-line communication

[0179] Preemption checking means that after the MAC layer selects resources for sideline communication transmission, it will at some future time re-sensitize the selected transmission resources to determine whether the resources have been reserved or preempted by other user equipment. If the transmission resources have been reserved or preempted by other user equipment, the MAC layer can trigger resource re-selection to replace the transmission resources preempted by other user equipment.

[0180] 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.

[0181] [Example 1]

[0182] 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.

[0183] 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.

[0184] like Figure 3 As shown, in Embodiment 1 of the present invention, the steps performed by the user equipment include:

[0185] In step S101, the higher layer requests (or triggers) the side-link communication user equipment (physical layer) to determine the transmission resources of PSSCH / PSCCH.

[0186] Optionally, the higher layer (or upper layer) refers to the Media Access Control (MAC) layer.

[0187] Optionally, the resource allocation method of the user equipment is a resource allocation method based on partial sensing.

[0188] Optionally, the higher layer requests the side-link communication user equipment to determine the transmission resources for PSSCH / PSCCH on time slot n.

[0189] Optionally, the higher layer provides a resource set (r0′, r1′, r2′, ...) on the time slot n. Optionally, the resource set is subject to pre-emption resources. The time slots in the time domain where the resource set (r0′, r1′, r2′, ...) reside are respectively represented as follows:

[0190] In step S102, the side-link communication user equipment determines a set of candidate slots.

[0191] Optionally, the way the user equipment determines the candidate time slot set depends on the user equipment implementation.

[0192] Optionally, the user equipment determines the candidate time slot set in the resource selection window.

[0193] Optionally, the candidate time slot set includes at least the time slot set.

[0194] In step S103, the side-link communication user equipment determines the set of time slots to be monitored.

[0195] Optionally, the user equipment in the time slot The above indicates (or reserves) any one of the side-line communication resources r in the resource set (r0′, r1′, r2′, ...). i ′.

[0196] Optionally, for any time slot in the candidate time slot set If the time slot is not included in the time slot set In this context, the set of time slots for the user equipment's shall monitor includes at least the following: Any time slot in the candidate time slot set; optionally, for any time slot in the candidate time slot set If the time slot is included in the time slot set In this context, the time slot set of the user equipment shakemonitor includes at least the following: Any time slot in the list, except for the time slot mentioned above. (if the time slot) Included in the time slot set (in the middle). Optionally, the P... reserve The k is determined by the configuration (or pre-configuration) information of the side-link communication; optionally, the P reserveThis refers to a subset or the entire set of all resource reservation periods included in the side-link communication resource pool configuration information, where k represents one or more positive integers, and the present invention does not impose any restrictions on this.

[0197] Figure 4 This is a block diagram illustrating the user equipment (UE) involved in this invention. For example... Figure 4 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.

[0198] 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.

[0199] It should be understood that the above embodiments of the present invention can be implemented by software, hardware, or a combination of both. 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 so on.

[0200] In this application, "base station" can refer to a mobile communication data and control switching center with high transmission power and wide coverage, including functions such as resource allocation and scheduling, and data reception and transmission. "User equipment" can refer to user mobile terminals, such as mobile phones, laptops, and other terminal devices that can wirelessly communicate with base stations or micro base stations.

[0201] Furthermore, the embodiments of the present invention disclosed herein can be implemented on a computer program product. More specifically, the computer program product is one that has a computer-readable medium on which computer program logic is encoded, which, when executed on a computing device, provides related operations to implement the above-described technical solutions of the present invention. When executed on at least one processor of a computing system, the computer program logic causes the processor to perform the operations (methods) described in the embodiments of the present invention. This configuration of the present invention is typically provided as software, code, and / or other data structures disposed or encoded on a computer-readable medium such as an optical medium (e.g., CD-ROM), floppy disk, or hard disk, or other media such as firmware or microcode on one or more ROM, RAM, or PROM chips, or downloadable software images, shared databases, etc., in one or more modules. The software or firmware or such configuration can be installed on a computing device to cause one or more processors in the computing device to execute the technical solutions described in the embodiments of the present invention.

[0202] Furthermore, each functional module or feature of the base station equipment and terminal equipment used in each of the above embodiments can be implemented or executed by circuitry, which is typically one or more integrated circuits. Circuitry designed to perform the various functions described in this specification may include general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs) or general-purpose integrated circuits, field-programmable gate arrays (FPGAs) 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 aforementioned general-purpose processor or each circuit may be configured by digital circuitry or by logic circuitry. Furthermore, when advancements in semiconductor technology lead to advanced technologies that can replace current integrated circuits, the present invention may also utilize integrated circuits obtained using such advanced technologies.

[0203] Although the present invention has been illustrated above with reference to preferred embodiments, those skilled in the art will understand that various modifications, substitutions, and alterations can be made to the invention without departing from its spirit and scope. Therefore, the invention should not be limited by the above embodiments, but rather by the appended claims and their equivalents.

Claims

1. A method executed by a user equipment, comprising: The higher layer provides a set of resources (r0′, r1′, r2′, ...) subordinate to preemption checks on slot n, where the time slot in the time domain of the resource set (r0′, r1′, r2′, ...) is represented as a time slot set. as well as The user equipment determines the set of time slots to monitor. For any time slot in the candidate time slot set If the time slot Not included in the time slot set In this context, the set of time slots monitored by the user equipment includes at least the following: Any time slot in; If the time slot Included in the time slot set In this context, the set of time slots monitored by the user equipment includes at least the following: In addition to time slots In any time slot other than, The user equipment in the time slot An SCI was sent, which indicated that in the time slot... Side-link communication resource y, which belongs to the resource set (r0′, r1′, r2′, ...) of the preemption check; The P reserve It represents a subset or the entire set of all resource reservation periods included in the side-link communication resource pool configuration information, where k represents one or more positive integers.

2. A user equipment, comprising: processor; as well as Memory, which stores instructions; The instructions are executed by the processor according to any one of claims 1.

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