WO2025162129A1 - Method executed by user equipment, and user equipment - Google Patents

Abstract

Provided in the present invention are a method executed by a user equipment, and a user equipment. The method comprises the following steps: on an unlicensed spectrum, receiving sidelink control information (SCI) and a physical sidelink shared channel (PSSCH); and on the basis of the received SCI and PSSCH, determining a physical resource block allocated for the PSSCH.

Description

Method performed by user equipment and user equipment Technical Field

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

Background Art

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

1) Discovery between nearby devices in LTE network coverage scenarios;

2) Direct broadcast communication between nearby devices (Broadcast function);

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

At the 3GPP RAN#66 plenary meeting in December 2014, the enhanced LTE eD2D (enhanced D2D) research project was approved (see Non-Patent Document 2). The main features introduced by LTE Release 13 eD2D include:

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

2) Priority processing mechanism for D2D communication.

Based on the design of D2D communication mechanisms, the 3GPP RAN#68 plenary meeting in June 2015 approved a feasibility study on V2X based on D2D communication. V2X, standing for Vehicle to Everything, aims to enable information exchange between vehicles and all entities that may affect them. The goal is to reduce accidents, ease traffic congestion, reduce environmental pollution, and provide other information services. V2X application scenarios primarily include four areas:

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

2) V2P, Vehicle to Pedestrian, where a vehicle sends a warning to a pedestrian or non-motor vehicle;

3) V2N, Vehicle to Network, which means vehicles connecting to mobile networks;

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

3GPP divides the research and standardization work of V2X into three phases. The first phase was completed in September 2016, focusing mainly on V2V, based on LTE Release 12 and Release 13 D2D (also known as sidelink communication), that is, 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 kilometers per hour) and high-node density environments. Vehicles can interact with information such as location, speed and direction through the PC5 interface, that is, vehicles can communicate directly through the PC5 interface. Compared with the proximity communication between D2D devices, the functions introduced by LTE Release 14 V2X mainly include:

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

2) Introducing sub-channels to enhance resource allocation;

3) Introducing a user equipment sensing mechanism with semi-persistent scheduling.

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

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

The 5G NR V2X project supports resource allocation mode 2 (RT2) based on user equipment sensing, also known as transmission mode 2. In RT2, the physical layer of the user equipment senses the transmission resources in the resource pool. The user equipment determines whether to exclude resources in the candidate resource set that overlap with the resources indicated by the SCI received from other user equipment based on the indication information in the SCI. The resources in the candidate resource set that are not excluded are reported to the upper layer, which randomly selects resources for PSSCH/PSCCH transmission from the reported resource set.

At the 3GPP RAN#95e plenary meeting in March 2022, a standardization research topic on the evolution of NR sidelink communications (NR SL evo) (see Non-Patent Document 6) was approved. The research objectives of NR SL evo include the following:

1) Research and standardize NR sidelink communications in unlicensed spectrum, referred to as SL-U. SL-U encompasses both resource allocation methods 1 and 2 for NR sidelink communications. This research project specifically includes:

a. SL-U reuses the channel access technology and operations of the NR air interface in unlicensed spectrum (NR unlicensed, abbreviated as NR-U). NR-U's channel access technology refers to the Listen Before Talk (LBT) technique, which means that before transmitting, the user device needs to monitor the channel resources used for transmission. If the channel is idle, the transmission proceeds; otherwise, the transmission is abandoned.

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

The scheme disclosed herein includes a method for determining PSSCH transmission physical resource block (PRB) allocation in SL-U, and a method for determining an initial transmission opportunity (initial transmission opportunity) in SL-U.

Prior art literature

Non-patent literature

Non-Patent Literature 1: RP-140518, Work item proposal on LTE Device to Device Proximity Services

Non-Patent Literature 2: RP-142311, Work Item Proposal for Enhanced LTE Device to Device Proximity Services

Non-Patent Literature 3: RP-152293, New WI proposal: Support for V2V services based on LTE sidelink

Non-Patent Literature 4: RP-170798, New WID on 3GPP V2X Phase 2

Non-Patent Literature 5: RP-181480, New SID Proposal: Study on NR V2X

Non-Patent Literature 6: RP-220300, WID revision: NR sidelink evolution

Summary of the Invention

In order to solve at least part of the above problems, the present invention provides a method performed by a user equipment and the user equipment, which can improve the reliability of sidelink communication on an unlicensed spectrum and improve the decoding accuracy of the sidelink communication.

According to the present invention, a method performed by a user equipment is proposed, comprising the following steps: receiving sideline communication control information SCI and a physical sideline communication shared channel PSSCH on an unlicensed spectrum; and determining a physical resource block allocated by the PSSCH based on the received SCI and the PSSCH.

Preferably, the resource allocation mode of the sideline communication is configured as a resource allocation mode based on continuous resource blocks RB.

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

Preferably, the subchannel with the highest number among the M subchannels overlaps with a single resource block set and a guard band physical resource block within the cell; or the subchannel with the highest number among the M subchannels completely overlaps with a guard band physical resource block within the cell, and/or the subchannel with the second highest number among the M subchannels overlaps with a single resource block set and/or a guard band physical resource block within the cell; or the resource block RB with the highest number in the subchannel with the highest number among the M subchannels overlaps with a guard band physical resource block within the cell.

Preferably, the physical resource blocks allocated by the PSSCH include the physical resource blocks on the allocated M subchannels, excluding the intra-cell guard band physical resource blocks in the subchannel with the highest number and/or the subchannel with the second highest number among the M subchannels.

In addition, according to the present invention, a method performed by a user equipment is proposed, comprising the following steps: selecting and generating a selected sideline communication scheduling license on an unlicensed spectrum; performing a sending resource selection or reselection process for the one selected sideline communication scheduling license; and determining an initial transmission opportunity and a retransmission transmission opportunity for the one selected sideline communication scheduling license.

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

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

Preferably, the step of determining the initial transmission opportunity and retransmission transmission opportunity permitted by the selected side communication scheduling includes: using the time-frequency resources on the first time slot in the first transmission opportunity in the time domain as the initial transmission opportunity; and using other time-frequency resources and/or other transmission opportunities in the first transmission opportunity in the time domain as the retransmission transmission opportunities.

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

Effects of the Invention

In SL-U, the present invention's solution describes that when the higher-level configuration sidelink communication resource allocation method is based on contiguous resource blocks, if the highest-numbered physical resource block in the highest-numbered subchannel overlaps with the intra-cell guard band, then the resource blocks in the subchannel allocated for PSSCH transmission that overlap with the intra-cell guard band are not used for PSSCH transmission, and the remaining resource blocks are used for PSSCH transmission. This solution ensures that when two consecutive resource block sets (RB sets) are not allocated for PSSCH transmission, the physical resource blocks (PRBs) corresponding to the intra-cell guard band between these two resource block sets are not used for PSSCH transmission, reducing interference with sidelink communications of other user devices and improving the reliability of sidelink communications on unlicensed spectrum. Furthermore, the present invention's solution also describes that when multiple consecutive time slots (MCSt) are transmitted, the media access control layer (MAC) uses the first sidelink communication resource of the first transmission opportunity in the time domain as the initial transmission opportunity. This solution ensures that other transmission opportunities can be used for retransmission, improving the decoding accuracy of sidelink communications.

BRIEF DESCRIPTION OF THE DRAWINGS

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

FIG1 is a schematic diagram illustrating a basic process of a method executed by a user equipment in a first embodiment of the present invention.

FIG2 is a schematic diagram illustrating a basic process of a method executed by a user equipment in a second embodiment of the present invention.

FIG3 is a block diagram illustrating a user equipment according to an embodiment of the present invention.

DETAILED DESCRIPTION

The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that the present invention is not limited to the specific embodiments described below. In addition, for the sake of simplicity, detailed descriptions of known technologies that are not directly related to the present invention are omitted to prevent confusion in understanding the present invention.

The following describes multiple embodiments of the present invention using a 5G mobile communication system and its subsequent evolutionary versions as example application environments. 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.

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

3GPP: 3rd Generation Partnership Project

LTE: Long Term Evolution

NR: New Radio, New Wireless, New Air Interface

PDCCH: Physical Downlink Control Channel, physical downlink control channel

DCI: Downlink Control Information, downlink control information

PDSCH: Physical Downlink Shared Channel, physical downlink shared channel

UE：User Equipment

eNB: evolved NodeB

gNB: NR base station

TTI: Transmission Time Interval, transmission time interval

OFDM: Orthogonal Frequency Division Multiplexing

CP-OFDM: Cyclic Prefix Orthogonal Frequency Division Multiplexing

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

CSI: Channel State Information, channel state information

HARQ: Hybrid Automatic Repeat Request

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

CRS: Cell Reference Signal, cell-specific reference signal

PUCCH: Physical Uplink Control Channel, physical uplink control channel

PUSCH: Physical Uplink Shared Channel, physical uplink shared channel

UL-SCH: Uplink Shared Channel, uplink shared channel

CG: Configured Grant, configuration scheduling permission

Sidelink: Sidelink communication

SCI: Sidelink Control Information, sidelink communication control information

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

MCS: Modulation and Coding Scheme, modulation and coding scheme

RB: Resource Block

RE：Resource Element

CRB: Common Resource Block, common resource block

CP: Cyclic Prefix

PRB: Physical Resource Block, physical resource block

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

FDM: Frequency Division Multiplexing

RRC: Radio Resource Control

RSRP: Reference Signal Receiving Power, reference signal receiving power

SRS: Sounding Reference Signal, detection reference signal

DMRS: Demodulation Reference Signal

CRC: Cyclic Redundancy Check

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

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

SFI: Slot Format Indication, slot format indication

TDD: Time Division Duplexing

FDD: Frequency Division Duplexing

SIB: System Information Block, system information block

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

SLSS: Sidelink synchronization Signal, sidelink communication synchronization signal

PSSS: Primary Sidelink Synchronization Signal, sidelink communication primary synchronization signal

SSSS: Secondary Sidelink Synchronization Signal, sidelink communication auxiliary synchronization signal

PCI: Physical Cell ID, physical cell identifier

PSS: Primary Synchronization Signal, primary synchronization signal

SSS: Secondary Synchronization Signal, auxiliary synchronization signal

BWP: BandWidth Part, bandwidth fragment/part

GNSS: Global Navigation Satellite System, Global Navigation Satellite System

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

DFN: Direct Frame Number, direct frame number

IE: Information Element

SSB: Synchronization Signal Block, synchronization system information block

EN-DC: EUTRA-NR Dual Connection, LTE-NR dual connectivity

MCG: Master Cell Group

SCG: Secondary Cell Group

PCell: Primary Cell

SCell: Secondary Cell

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

SPS: Semi-Persistant Scheduling

TA: Timing Advance, uplink timing advance

PT-RS: Phase-Tracking Reference Signals

TB: Transport Block

CB: Code Block, coding block/code block

QPSK: Quadrature Phase Shift Keying, quadrature phase shift keying

16/64/256 QAM: 16/64/256 Quadrature Amplitude Modulation

AGC: Auto Gain Control, automatic gain control

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

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

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

SC-FDMA: Single Carrier-Frequency Division Multiple Access

MAC: Medium Access Control, media access control layer

PDU: Protocol Data Unit

DRX: Discontinuous Reception

SL-U: Sidelink unlicensed, sidelink communication on unlicensed spectrum

NR-U: NR unlicensed, NR communication on unlicensed spectrum

LBT: Listen Before Talk

TBS: Transport Block Size, transport block size

CQI: Channel Quality Information, channel quality information

CPE: Cyclic Prefix extension

COT: Channel Occupancy Time, channel occupancy time

MCSt：Multiple Consecutive Slots transmission, multiple consecutive time slot transmission

The following is a description of the prior art associated with the present invention. Unless otherwise specified, the same terms in the specific embodiments and the prior art have the same meanings.

It is worth noting that V2X and sidelink in this specification are synonymous. V2X in this document can also refer to sidelink; similarly, sidelink in this document can also refer to V2X, and no specific distinction or limitation will be made in the following text.

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

The PSCCH in the specification of the present invention is used to carry SCI. The PSCCH corresponding to, or corresponding to, or related to, or scheduled PSSCH involved in the specification of the present invention have the same meaning, all indicating associated PSSCH or corresponding PSSCH. Similarly, the SCI (including first-level SCI and second-level SCI) corresponding to, or corresponding to, or related to, the PSSCH involved in the specification have the same meaning, all indicating associated SCI or corresponding SCI. It is worth noting that the first-level SCI is called 1st stage SCI or SCI format 1-A, which is transmitted in PSCCH; the second-level SCI is called 2nd stage SCI or SCI format 2-A (or SCI format 2-B), which is transmitted in the corresponding PSSCH resources.

The NR sideline communication (SL-U for short) 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 devices that access the channel through Wi-Fi technology (wireless LAN technology based on IEEE 802.11 standard), and there may also be NR sideline communication user devices that access the channel through the PC5 interface.

Parameter set (numerology) in NR (including NR sidelink) and NR (including NR sidelink) slot

The parameter set (numerology) includes two aspects: 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, and 4). Table 4.2-1 shows the supported transmission parameter sets, as shown below.

Table 4.2-1 Subcarrier spacing supported by NR

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

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

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

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

On NR carriers, the system frame (or simply frame) number (SFN) ranges from 0 to 1023. The concept of a direct system frame number (DFN) is introduced for sideline communications, also ranging from 0 to 1023. The above description of the relationship between system frames and parameter sets (numerology) also applies to direct system frames. For example, the duration of a direct system frame is also equal to 10ms. For a 15kHz subcarrier spacing, a direct system frame consists of 10 time slots, and so on. DFN is used for timing on the sideline carrier.

Resource blocks RB and resource elements RE

Resource blocks RB are defined in the frequency domain as For example, for a subcarrier spacing of 15 kHz, an RB is 180 kHz in the frequency domain. For a subcarrier spacing of 15 kHz × 2 ^μ , a resource element RE represents one subcarrier in the frequency domain and one OFDM symbol in the time domain.

Sideline communication scenario

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

2) Sideline communication with network coverage: Both UEs performing sideline communication have network coverage (for example, the UE detects at least one cell that meets the "cell selection criteria" on the frequency required for sideline communication, indicating that the UE has network coverage).

3) Partial-Coverage Sideline Communication: One of the UEs performing sideline communication has no network coverage, while the other UE has network coverage.

From the UE side, there are only two scenarios: no network coverage and network coverage. Partial network coverage is described from the perspective of sideline communication.

Sidelink resource pool

In sidewalk communication, the UE's transmission and reception resources all belong to a resource pool. For example, for a transmission mode based on base station scheduling in sidewalk communication, the base station schedules transmission resources for the sidewalk UE in the resource pool, or for a transmission mode based on UE perception in sidewalk communication, the UE determines transmission resources in the resource pool.

For NR sidelink communications, frequency domain resource allocation is supported based on sub-channels as the minimum granularity. That is, for PSSCH transmission, the resources occupied in the frequency domain are an integer number of sub-channels. A sub-channel can represent several consecutive resource blocks (RBs) in the frequency domain.

Perception-based resource allocation

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

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

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

In the resource allocation method based on sensing (or partial sensing), the upper layer requests or triggers the physical layer to determine the resources for PSSCH/PSCCH transmission (perform sensing or partial sensing) in time slot n. The resource selection window is defined as [n+T1, n+T2], that is, the user equipment selects the transmission resources within this window. Among them, T1 meets the condition The choice of T1 depends on the user equipment implementation. The RRC configuration information includes a resource selection window configuration list, sl-SelectionWindowList, where the element in this list corresponding to a given priority level, prio _TX (priority for transmitting PSSCH), is represented by T _2min . If T _2min is less than the remaining packet delay budget (remaining PDB), then T2 satisfies the condition T _2min ≤ T2 ≤ remaining PDB. The choice of T2 depends on the user equipment implementation. Otherwise, T2 is set to the remaining PDB. The definition of is as follows (μ _SL represents the subcarrier spacing parameter of side communication, that is, the subcarrier spacing is ):

Table 8.1.4-2: The value of

Table 8.1.4-1: The value of

LBT (Listen Before Talk) mechanism

For wireless communications in unlicensed spectrum, some countries or regions (for example, Europe) require user devices to perform LBT (Listen Before Talk) before transmitting. This mechanism, also known as channel access, involves sensing the channel to determine its availability. Specifically, during a period before transmission, the user device will only transmit if it detects the channel is idle; otherwise, it will not transmit.

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

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

In the table above, using a 15kHz subcarrier spacing and a 40MHz carrier bandwidth as an example, 105-6-105 indicates that the carrier contains two consecutive RB sets, each containing 105 RBs. Between these two RB sets, there is a guard band (GB) consisting of six consecutive RBs, for a total of 216 consecutive RBs. This applies similarly to the other items in Table 1.

It is worth noting that the LBT operations performed by the (sideline communication) user equipment on different RB sets can be independent of each other (i.e., the two are unrelated). For example, the user equipment detects that the channel is idle on RB set 1, and the channel is occupied (or busy) on RB set 2. If the resources selected by the sideline communication user equipment for transmitting PSSCH/PSCCH include (all or part of) the 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 RB set 1 and RB set 2 at the same time.

MCSt (Multiple Consecutive Slots transmission) multiple consecutive time slot transmission

For wireless communications on unlicensed spectrum, user devices are supported to transmit on multiple consecutive time slots, referred to as MCSt. Because user devices transmit on consecutive time slots, other user devices (e.g., Wi-Fi user devices) consider the current channel to be busy (not idle), effectively reducing the frequency (number, or need) of channel access (i.e., LBT) by the user device, thereby increasing transmission efficiency. In this specification, N _{slot, MCSt} is used to represent the number of consecutive time slots in the time domain.

Candidate multi-slot resource

When the MAC layer provides the physical layer with an N _slot,MCSt greater than 1, the physical layer uses the candidate multi-slot resource; otherwise, it uses the candidate single-slot resource. A candidate multi-slot resource includes N _slot,MCSt consecutive time slots in the time domain.

Hereinafter, specific examples and embodiments of the present invention will be described in detail. As described above, the examples and embodiments described in this disclosure are provided for illustrative purposes to facilitate understanding of the present invention and are not intended to limit the present invention.

[Example 1]

FIG1 is a schematic diagram illustrating a basic process of a method executed by a user equipment according to a first embodiment of the present invention.

The method executed by the user equipment according to the first embodiment of the present invention will be described in detail below with reference to the basic process diagram shown in FIG1 .

As shown in FIG1 , in the first embodiment of the present invention, the steps performed by the user equipment include:

In step S101 , a sideline communication user equipment receives sideline communication control information SCI and a physical sideline communication shared channel PSSCH on an unlicensed spectrum (or on a shared spectrum).

Optionally, the resource allocation mode of the sideline communication is configured as a resource allocation mode based on continuous resource blocks (RBs).

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

Optionally, the highest-numbered subchannel among the M subchannels overlaps with a single RB set and intra-cell guard band PRBs,

Alternatively, the subchannel with the highest number among the M subchannels completely overlaps with a guard band physical resource block within the cell (or the subchannel with the highest number among the M subchannels is completely located in a guard band physical resource block within the cell), and/or the subchannel with the second highest number among the M subchannels overlaps with a single resource block set and/or a guard band physical resource block within the cell,

Alternatively, the resource block RB with the highest number in the sub-channel with the highest number among the M sub-channels overlaps with a guard band physical resource block in the cell.

In step S102, the user equipment determines the physical resource block (PRB) allocated (or scheduled) for the PSSCH.

The physical resource blocks allocated by the PSSCH include the physical resource blocks on the allocated M subchannels, excluding the intra-cell guard band physical resource blocks in the subchannel (one or more) with the highest number among the M subchannels and/or the subchannel with the second highest number.

[Example 2]

FIG2 is a schematic diagram illustrating a basic process of a method executed by a user equipment according to a second embodiment of the present invention.

The method executed by the user equipment according to the second embodiment of the present invention will be described in detail below with reference to the basic process diagram shown in FIG2 .

As shown in FIG2 , in the second embodiment of the present invention, the steps performed by the user equipment include:

In step S201, the sidelink user equipment selects to generate a selected sidelink scheduling grant (selected sidelink grant), and, optionally, sidelink data is available on a logical channel.

Wherein, optionally, the selected side communication scheduling permission corresponds to (correspond to) the transmission of one or more MAC protocol data units PDU.

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

Optionally, the user equipment selects time-frequency resources from a resource set indicated by the physical layer for a first transmission opportunity.

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

In step S203, the user equipment determines the initial transmission opportunity (initial transmission opportunity) and retransmission opportunity (retransmission opportunity) of the selected side communication scheduling permission.

Optionally, the user equipment uses the time-frequency resources on the first time slot in the first transmission opportunity in the time domain as the initial transmission opportunity, and

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

FIG3 is a block diagram illustrating a user equipment (UE) according to the present invention. As shown in FIG3 , the user equipment (UE) 30 includes a processor 301 and a memory 302. Processor 301 may include, for example, a microprocessor, a microcontroller, or an embedded processor. Memory 302 may include, for example, a volatile memory (e.g., a random access memory (RAM), a hard disk drive (HDD), a non-volatile memory (e.g., a flash memory), or other memory. Memory 302 stores program instructions. When executed by processor 301, these instructions may execute the method described in detail herein.

The method of the present invention and the related devices have been described above in conjunction with the preferred embodiments. Those skilled in the art will understand that the method shown above is only exemplary, and the various embodiments described above can be combined with each other when no contradiction occurs. The method of the present invention is not limited to the steps and sequence shown above. The network node and user equipment shown above may include more modules, for example, modules that can be developed or developed in the future and can be used for base stations, MMEs, or UEs, etc. The various identifiers shown above are only exemplary and not restrictive, and the present invention is not limited to the specific information elements used as examples of these identifiers. Those skilled in the art can make many changes and modifications based on the teachings of the illustrated embodiments.

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

In this application, "base station" refers to a mobile communication data and control switching center with high transmission power and wide coverage area, including functions such as resource allocation and scheduling, and data reception and transmission. "User equipment" refers to a user's mobile terminal, such as a mobile phone or laptop, that can communicate wirelessly with a base station or micro base station.

In addition, the embodiments of the present invention disclosed herein can be implemented on a computer program product. More specifically, the computer program product is a product as follows: having a computer-readable medium, on which computer program logic is encoded, and when executed on a computing device, the computer program logic provides relevant operations to implement the above-mentioned 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 arrangement of the present invention is typically provided as software, code and/or other data structures arranged or encoded on a computer-readable medium such as an optical medium (e.g., CD-ROM), a floppy disk or a hard disk, or other media such as firmware or microcode on one or more ROM or RAM or PROM chips, or downloadable software images, shared databases, etc. in one or more modules. Software or firmware or this configuration can be installed on a computing device so that one or more processors in the computing device execute the technical solutions described in the embodiments of the present invention.

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

Although the present invention has been described above in conjunction with the preferred embodiments of the present invention, it will be understood by those skilled in the art that various modifications, substitutions, and changes may be made to the present invention without departing from the spirit and scope of the present invention. Therefore, the present invention should not be limited by the above-described embodiments, but should be limited by the appended claims and their equivalents.

Claims (6)

A method performed by a user equipment, comprising the following steps: Receive sideline communication control information SCI and physical sideline communication shared channel PSSCH in unlicensed spectrum; and According to the received SCI and the PSSCH, a physical resource block allocated by the PSSCH is determined. The method according to claim 1, wherein The resource allocation mode of the sideline communication is configured as a resource allocation mode based on continuous resource blocks RB. The method according to claim 1, wherein The SCI indicates that M subchannels are allocated to the PSSCH in the frequency domain, where M is greater than 1. The method according to claim 3, wherein The sub-channel with the highest number among the M sub-channels completely overlaps with the guard band physical resource block in the cell. The method according to claim 4, wherein The physical resource blocks allocated by the PSSCH include the physical resource blocks on the allocated M sub-channels, excluding the intra-cell guard band physical resource blocks in the sub-channel with the highest number among the M sub-channels. A user equipment, comprising: processor; and Memory, which stores instructions, The instructions, when executed by the processor, perform the method according to any one of claims 1 to 5.