CN111601274A

CN111601274A - Method performed by user equipment and user equipment

Info

Publication number: CN111601274A
Application number: CN201910135918.XA
Authority: CN
Inventors: 赵毅男; 刘仁茂; 罗超
Original assignee: FG Innovation Co Ltd; Sharp Corp
Current assignee: FG Innovation Co Ltd; Sharp Corp
Priority date: 2019-02-21
Filing date: 2019-02-21
Publication date: 2020-08-28
Also published as: WO2020169067A1

Abstract

The invention provides a method executed by user equipment and the user equipment, wherein the method comprises the following steps: the UE monitors first side communication control information SCI sent by other user equipment UE; removing a used configuration scheduling grant CG from a configuration scheduling grant CG resource pool based on the first SCI; and the UE selects an unused CG in the CG resource pool and sends a second SCI.

Description

Method performed by user equipment and user equipment

Technical Field

The present invention relates to the field of wireless communication technologies, and in particular, to a method performed by a user equipment and a corresponding user equipment.

Background

In a conventional cellular network, all communications must pass through the base station. In contrast, D2D communication (Device-to-Device communication, direct Device-to-Device communication) refers to a communication method in which two user devices communicate directly without forwarding through a base station or a core network. The research topic on the realization of the D2D-adjacent communication service by LTE devices was approved at RAN #63 of 3rd generation Partnership Project (3 GPP) in 2014 (see non-patent document 1). Functions introduced by LTE Release 12D2D include:

1) discovery function (Discovery) between adjacent devices in an LTE network coverage scenario;

2) a direct Broadcast communication (Broadcast) function between neighboring devices;

3) the higher layer supports Unicast (Unicast) and multicast (Groupcast) communication functions.

On the 3GPP RAN #66 congress of 12 months in 2014, the research project of enhanced LTE eD2D (enhanced D2D) was approved (see non-patent document 2). The main functions introduced by LTE Release 13eD2D include:

1) D2D discovery of no-network coverage scenarios and partial-network coverage scenarios;

2) priority handling mechanism for D2D communications.

Based on the design of the D2D communication mechanism, the V2X feasibility study topic based on D2D communication was approved at the RAN #68 time congress of 3GPP at 6 months 2015. V2X shows that Vehicle to evolution is expected to realize the interaction between Vehicle and all entity information that may affect the Vehicle, in order to reduce accident, slow down traffic jam, reduce environmental pollution and provide other information services. The application scenario of V2X mainly includes 4 aspects:

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

2) V2P, Vehicle to peer, i.e. the Vehicle sends a warning to pedestrians or non-motor vehicles;

3) V2N, Vehicle to Network, i.e. Vehicle connected mobile Network;

4) V2I, Vehicle to Infrastructure, i.e. the Vehicle communicates with road Infrastructure etc.

The 3GPP has divided the research and standardization work of V2X into 3 stages. The first phase was completed in 2016 and 9 months, mainly focusing on V2V, and was formulated based on LTE Release 12 and Release 13D2D (also called sidelink communication), i.e., proximity communication technology (see non-patent document 3). V2X stage 1 introduced a new D2D communication interface, called PC5 interface. The PC5 interface is mainly used to solve cellular internet of vehicles communication problems in high speed (up to 250 km/h) and high node density environments. The vehicles can interact with information such as position, speed and direction through the PC5 interface, i.e., the vehicles can communicate directly with each other through the PC5 interface. Compared with the proximity communication between D2D devices, the functions introduced by LTE Release 14V2X mainly include:

1) higher density DMRS to support high speed scenarios;

2) introducing a sub-channel (sub-channel) to enhance a resource allocation mode;

3) a user equipment aware (sensing) mechanism with semi-persistent scheduling (semi-persistent) is introduced.

The second stage of the research topic of V2X belongs to the research category of LTE Release 15 (see non-patent document 4), and the introduced main characteristics include high-order 64QAM modulation, V2X carrier aggregation, short TTI transmission, and feasibility research of transmit diversity.

At the 3GPP RAN #80 congress of 6 months in 2018, the corresponding third stage was approved based on the V2X feasibility study topic of 5G NR network technology (see non-patent document 5). The research project of this problem includes the design of sidelink resource allocation scheme (or called sidelink transmission mode). In the 3GPP RAN1#94 conference of 8 months in 2018 (see non-patent document 6), sidelink communication includes at least two resource allocation methods, which are respectively called a mode1 resource allocation method based on base station scheduling and a mode2 resource allocation method for determining sidelink communication resources by UE. The specific definitions of Mode1 and Mode2 are:

1) mode 1: a base station schedules resources used by UE sidelink communication;

2) mode 2: and the UE determines the resources used by sidelink communication in the resources configured or pre-configured by the base station.

Wherein Mode2 comprises 4 seed modes (sub-Mode), which are defined as Mode 2(a), (b), (c) and (d), respectively. Mode2 contains 4 seed patterns defined specifically as:

1) mode2 (a): UE self-selects sidelink communication resources;

2) mode2 (b): the UE assists other UEs to select sidelink communication resources;

3) mode2 (c): a base station configures a configuration scheduling grant (CG, may be abbreviated as CG) of a UE NR type 1(NR type 1);

4) mode2 (d): and the UE schedules resources of the sidelink communication of other UEs.

In an AH #1901 conference of 3GPP RAN1 in month 1 of 2019 (see non-patent document 7), configuration scheduling grants of NR type1 and NR type 2(NR type 2) are discussed and supported by a Mode1 resource allocation manner. Specifically, when the NR base station gNB schedules a UE for sidelink communication of mode1, the gNB may configure CGs of NR type1 and NR type 2 for the UE. Meanwhile, in the current conference, for the mode 2(c) resource allocation mode, when the base station configures one or more CGs of the UE, the UE selects the unused CGs according to the perceived result.

The scheme of the invention mainly aims at a method for selecting unused CG by NR sidelink UE in a resource allocation mode 2(c) and a method for setting a domain related to the CG in sidelink control information after the NR sidelink UE selects the CG for sidelink communication. Meanwhile, the scheme of the present invention also includes a method for setting the domain related to the CG in the sidelink control information by the NRsidelink UE in the resource allocation mode 1.

At the 3GPP RAN1#94bis conference of month 10 in 2018, the design of the NR V2X synchronization mechanism contains the following two conclusions (see non-patent document 8):

1) for NR sidelink UEs, the eNB is supported as a synchronization source (sync source, or sync reference), that is, the NR sidelink UE may select the eNB as the synchronization source;

2) for NR sidelink, it is supported that the eNB controls the resource allocation mode (NR V2X resource allocation mode2) based on UE self-selection in NR sidelink, i.e. the eNB broadcasts semi-static configuration information of NR V2X resource allocation mode 2.

When the NR sidelink UE selects the synchronization source, if the NR sidelink UE can select the gNB or eNB as the sync reference, the scheme of the present invention also includes a method for the NR sidelink UE to select the gNB or eNB as the synchronization source.

In the AH #1901 conference of 3GPP RAN1 in month 1 of 2019 (see non-patent document 7), the design of HARQ feedback mechanism for NR V2X multicast (groupcast) involves the following conclusions: for groupcast communication, when HARQ feedback is enabled, two HARQ feedback mechanisms are supported, which are respectively: 1) receiving HARQ NACK fed back only by the UE; 2) and receiving HARQ ACK and NACK fed back by the UE.

For NR V2X multicast communications, the solution of the present invention also includes a method for the receiving UE to determine to feed back HARQ NACKs, or to feed back HARQ ACKs and NACKs.

In Rel-15NR, the UE determines the starting CRB number of the initial downlink bandwidth segment (initial DL BWP) according to the offset value of the carrier (or resource grid) with respect to point a and the offset value of the initial downlink bandwidth segment (initial DL BWP) with respect to the starting CRB of the carrier (or resource grid). And, the NR supporting base station configures a UE specific (UE specific) channel bandwidth (otherwise referred to as a carrier or a resource grid) through a dedicated signaling (dedicated signaling). When the base station configures the UE-specific channel bandwidth, the UE-specific channel bandwidth parameter may override (override) the corresponding (correcting) parameter configuration of the cell specific (cell specific). In the current 3GPP protocol, the gNB only configures an offset value of a UE-specific carrier (or resource grid) relative to point a for the UE, and does not configure an offset value of an initial downlink BWP relative to a starting CRB of the carrier (or resource grid) for the UE in the UE-specific configuration information. The scheme of the invention provides a method for configuring a starting CRB offset value of UE-specific initial downlink BWP relative to a carrier (or a resource grid) by a base station through a proprietary signaling.

Documents of the prior art

Non-patent document

Non-patent document 1: RP-140518, Work item deployment on LTE Device to Device deployment Services

Non-patent document 2: RP-142311, Work Item Proposal for Enhanced LTE device Proximity Services

Non-patent document 3: RP-152293, New WI propofol: support for V2V services basedon LTE sidelink

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

Non-patent document 5: RP-181480, New SID Proposal: study on NR V2X

Non-patent document 6: RAN1#94, Charrman notes, section 7.2.4.1.4

Non-patent document 7: RAN1 AH #1901, Charrman nodes, section 7.2.4.1.4, section7.2.4.3

Non-patent document 8: RAN1#94bis, Chairman nodes, section 7.2.4.1.3

Disclosure of Invention

To address at least some of the above issues, the present invention provides a method performed by a user equipment and a user equipment.

According to a first aspect of the present invention, there is provided a method performed by a user equipment, UE, comprising: the UE monitors first side communication control information SCI sent by other user equipment UE; removing a used configuration scheduling grant CG from a configuration scheduling grant CG resource pool based on the first SCI; and the UE selects an unused CG in the CG resource pool and sends a second SCI.

In the above method, the first SCI may include a CG sequence number and/or first reserved resource interval indication information, and the UE removes a CG overlapping with a CG corresponding to the CG sequence number from the CG resource pool, and/or removes a CG overlapping with a time-frequency resource indicated by the first reserved resource interval indication information from the CG resource pool.

In the above method, the second SCI may include: a sequence number of a CG selected by the UE, and/or a second reserved resource interval indication corresponding to the UE.

In the above method, the first SCI may include indication information of a time-frequency resource and indication information of a time-frequency resource period or interval, and the UE removes, from the CG resource pool, a CG overlapping with the time-frequency resource indicated by the indication information of the time-frequency resource period or interval.

In the above method, the second SCI may include: an indication of time-frequency resources corresponding to the UE, and/or an indication of time-frequency resource periods or intervals corresponding to the UE.

In the above method, the first SCI may include first time-frequency resource period or interval indication information and/or second time-frequency resource period or interval indication information, and the UE removes, from the CG resource pool, a CG overlapping with a time-frequency resource indicated by the first time-frequency resource period or interval indication information and/or removes, from the CG resource pool, a CG overlapping with a time-frequency resource indicated by the second time-frequency resource period or interval indication information.

In the above method, the second SCI may include: an indication of a period or interval of reserved resources corresponding to the UE, and/or an indication of a period or interval of a CG selected by the UE.

In the above method, the first SCI may include an indication of a reserved resource period or interval and/or an indication of a CG period, the UE removes a CG from the CG resource pool whose period value is greater than the reserved resource period or interval corresponding to the UE, and the second SCI includes a period of a CG selected by the UE and/or a time-frequency resource of the selected CG and/or a period or interval of a reserved resource corresponding to the UE.

In the above method, the overlapping may represent a partial overlap or a complete overlap of time domain, frequency domain resources, and a period or an interval of the reserved resources corresponding to the UE may be indicated by an upper layer.

According to a second aspect of the present invention, there is provided a user equipment comprising: a processor; and a memory storing instructions; wherein the instructions, when executed by the processor, perform a method in the user equipment according to the context.

Drawings

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

fig. 1 is a schematic diagram illustrating LTE V2X UE sidelink communications.

Fig. 2 is a schematic diagram illustrating a resource allocation method of LTE V2X when eNB network coverage exists.

Fig. 3 is a flow chart illustrating a method performed by a user equipment according to the present invention.

Fig. 4 is a diagram illustrating a basic procedure of a method performed by a user equipment in the first embodiment of the present invention.

Fig. 5 is a diagram illustrating a basic procedure of a method performed by a user equipment in the second embodiment of the present invention.

Fig. 6 is a diagram illustrating a basic procedure of a method performed by a user equipment in the third embodiment of the present invention.

Fig. 7 is a diagram illustrating a basic procedure of a method performed by a user equipment in the fourth embodiment of the present invention.

Fig. 8 is a diagram illustrating a basic procedure of a method performed by a user equipment in embodiment five of the present invention.

Fig. 9 is a block diagram illustrating a user equipment according to an embodiment of the present invention.

Detailed Description

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

Embodiments according to the present invention are described in detail below with a 5G mobile communication system and its subsequent evolution as an example application environment. However, it is to be noted that the present invention is not limited to the following embodiments, but is applicable to more other wireless communication systems, such as a communication system after 5G and a 4G mobile communication system before 5G, and the like.

Some terms to which the present invention relates will be described below, and the terms to which the present invention relates are defined herein, unless otherwise specified. The terms given in the invention may adopt different naming manners in LTE, LTE-Advanced Pro, NR and the following communication systems, but the unified terms adopted in the invention can be replaced by the terms adopted in the corresponding systems when being applied to the specific systems.

3 GPP: 3rd Generation partnershift Project, third Generation Partnership Project

LTE: long Term Evolution, Long Term Evolution technology

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 (pdcch)

UE: user Equipment, User Equipment

eNB: evolved NodeB, evolved node B

And g NB: NR base station

TTI: transmission Time Interval, Transmission Time Interval

OFDM: orthogonal Frequency Division Multiplexing, Orthogonal Frequency Division Multiplexing

C-RNTI: cell Radio Network Temporary Identifier

CSI: channel State Indicator, Channel State Indicator

HARQ: hybrid Automatic Repeat Request (HARQ)

CSI-RS: CSI-Reference Signal, channel State measurement 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, configuring scheduling Grant

Sidelink: sidelink communications

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

CRB: common Resource Block, Common Resource Block

And (3) CP: cyclic Prefix, Cyclic Prefix

PRB: physical Resource Block, Physical Resource Block

PSSCH: physical Sidelink Shared Channel, a Physical Sidelink communication Shared Channel

FDM: frequency Division Multiplexing, Frequency Division Multiplexing

RRC: radio Resource Control, Radio Resource Control

RSRP: reference Signal Receiving Power, Reference Signal Receiving Power

SRS: sounding Reference Signal

DMRS: demodulation Reference Signal

CRC: cyclic Redundancy Check (crc)

PSDCH: physical Sidelink Discovery Channel

PSBCH: physical Sidelink Broadcast Channel, Physical Sidelink communication Broadcast Channel

SFI: slot Format Indication

TDD: time Division Duplexing

FDD: frequency Division Duplexing

SIB 1: system Information Block Type1, System Information Block Type1

SLSS: sidelink synchronization Signal, a side-line communication synchronization Signal

PSSS: primary Sidelink Synchronization Signal, sideline communication Primary Synchronization Signal

SSSS: secondary Sidelink Synchronization Signal, sideline communication auxiliary Synchronization Signal

PCI: physical Cell ID, Physical Cell identity

PSS: primary Synchronization Signal, Primary Synchronization Signal

SSS: secondary Synchronization Signal, Secondary Synchronization Signal

BWP: bandwidth Part, BandWidth fragment/portion

GNSS: global Navigation Satellite positioning System (GNSS)

SFN: system Frame Number, System (radio) Frame Number

DFN: direct Frame Number, Direct Frame Number

IE: information Element, Information Element

And (3) SSB: synchronization Signal Block, synchronous System information Block

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

MCG (calcium carbonate): master Cell Group, Master Cell Group

SCG: secondary Cell Group, Secondary Cell Group

PCell: primary Cell, Primary Cell

SCell: secondary Cell, Secondary Cell

PSFCH: physical Sidelink Feedback Channel, Physical Sidelink communication Feedback Channel

The following is a description of the prior art associated with the inventive arrangements. Unless otherwise specified, the meanings of the same terms in the specific examples are the same as those in the prior art.

It is to be noted that V2X referred to in the description of the present invention has the same meaning as sidelink. V2X herein may also represent sidelink; similarly, sidelink herein may also refer to V2X, and is not specifically distinguished or limited hereinafter.

The CG and resource pattern (resource pattern) in the description of the present invention may be equivalently replaced. That is, the CG referred to in the specification may indicate a resource pattern, and the resource pattern referred to may indicate a CG.

In the description of the present invention, the resource allocation method of V2X (sidelink) communication and the transmission mode of V2X (sidelink) communication may be replaced by equivalent methods. The resource allocation pattern referred to in the specification may indicate a transmission mode, and the transmission mode referred to may indicate a resource allocation pattern.

In the description of the present invention, floor () represents a lower rounding operation, and mod () represents a remainder operation.

The symbol "a- > B" in the description of the present invention indicates a configuration in which the parameter (or, IE) a contains the parameter (or, IE) B. In the description of the present invention, the same reference numerals denote the same meaning, and the configuration information has the same form.

In the description of the present invention, a CG pool (CG pool) represents one or more CGs configured by a base station or Pre-configured (Pre-configuration) by a user equipment.

NR type 1(type 1) configuration scheduling grant (CG)

In Rel-15NR, a CG-based uplink scheduling method is simultaneously supported on the basis of supporting DCI dynamic scheduling PUSCH. In the description of the present invention, CG denotes a configured grant, i.e., a scheduling grant representing a configuration. For the configuration of the scheduling grant of the NR type1, the base station configures CG for the UE through RRC signaling. In the mechanism of configuring the scheduling grant by NR type1, the UE can transmit PUSCH by using the CG configured by the base station without monitoring the DCI dynamic scheduling including the UL grant. The method specifically comprises the following steps: the base station configures parameters for PUSCH transmission through RRC signaling configuredGrantConfig, wherein the RRC signaling configuredGrantConfig includes RRC-configuredUplinkGrant. The configuration scheduling grant configuredGrantConfig includes at least the time domain resource, the frequency domain resource, and the resource period of the semi-persistent scheduled PUSCH. Wherein the rrc-configurable uplink grant comprises the scheduling of the time domain resource and the frequency domain resource. In type 1CG PUSCH transmission, the UE does not need to monitor an uplink scheduling grant (UL grant) in the DCI, and after the base station configures type 1CG (IE: configurable grant configuration), the UE may transmit the PUSCH using the configured CG resource.

Overview of Rel-15EN-DC

LTE-NR Dual connectivity (EN-DC for short) is supported in Rel-15. EN-DC indicates that for one NR UE, the UE initially accesses through a cell of LTE while configuring a cell of NR, and is therefore called dual connectivity. In the EN-DC scenario, one or more cells of an LTE base station eNB are referred to as MCGs. The frequency of the MCG cell is called the service frequency (serving frequency) of the MCG. Among them, the MCG operating at a Primary frequency (Primary frequency) is called PCell. One or more cells of the NR base station gNB are called SCG. The frequency in which the SCG cell is located is called a serving frequency (servingfrequency) of the SCG. In SCG, a cell in which the UE performs RRC reconfiguration and performs random access is referred to as a PSCell, i.e., a PrimarySCell.

NR parameter set (numerologiv)

The parameter set of NR includes both subcarrier spacing and CP length. Rel-15NR supports 5 subcarrier spacings at 15kHz, 30kHz, 60kHz, 120kHz, 240kHz (corresponding to μ ═ 0, 1, 2, 3, 4), and tables 4.2-1 show the set of parameters supported by NR, as shown below.

TABLE 4.2-1.NR numerology

μ	Δf＝2^μ·15[kHz]	CP (Cyclic prefix)
			0	15	Is normal
1	30	Is normal
			2	60	Normal, extended
3	120	Is normal
			4	240	Is normal

Extended (Extended) CP is supported only when μ ═ 2, i.e., in the case of 60kHz subcarrier spacing, and only normal CP is supported in the case of other subcarrier spacing. For Normal (Normal) CP, each slot (slot) contains 14 OFDM symbols; for extended CP, each slot contains 12 OFDM symbols. For a sub-carrier spacing of 15kHz, 0, 1 slot 1 ms; mu is 1, namely 30kHz subcarrier interval, and 1 time slot is 0.5 ms; mu is 2, i.e. 60kHz subcarrier spacing, 1 slot is 0.25ms, and so on.

NR Common resource Block (Common RB, CRB)

The common resource block CRB is defined for the parameter set numerology. For all numerologies, the center frequency of subcarrier 0 of common resource block CRB number 0 points to the same position in the frequency domain, which is called "point a".

NR resource grid (resource grid)

In a given transmission direction (denoted by x, wherein DL means downlink and UL means uplink) of a carrier (carrier), a resource grid is defined for each numerology, which contains in the frequency domain a resource grid

Sub-carriers (i.e.

A plurality of Resource Blocks (RB), each resource block comprising

A subcarrier) included in the time domain

An OFDM symbol (

Representing the number of OFDM symbols within a subframe, with specific values related to μ), where

The number of sub-carriers in one resource block RB is satisfied

Common Resource Block (CRB) of lowest number of resource grid

Configured by a high-level parameter offset ToCarrier, the number of frequency domain resource blocks

Configured by the higher layer parameter carrierBandwidth. Wherein, for a given numerology and higher layer parameter offsetttocarrier, the gNB configures a cell specific (cell specific) common (common) offsetttocarrier in the ServingCellConfigCommon IE by dedicated signaling (dedicated signaling). The method specifically comprises the following steps: the ServingCellConfigCommon includes a high-level parameter downlinkConfigCommon, and the downlinkConfigCommon includes configuration information of the offsetttocarrier.

Bandwidth fragment (BWP) and initial downstream bandwidth fragment (initial DL BWP)

In NR, one or more bandwidth segments may be defined for each parameter set numerology. Each BWP contains one or more consecutive CRBs. Assuming that the number of a BWP is i, its starting point

And length

The following relationship must be satisfied simultaneously:

that is, the CRB included in the BWP must be located within the corresponding numerology resource grid.

The distance from the lowest-numbered CRB of the BWP to point a is represented in RB units using the CRB number.

Resource blocks within a BWP are referred to as Physical Resource Blocks (PRBs), which are numbered as

Wherein physical resource block 0 corresponds to the lowest numbered CRB of the BWP, i.e., CRB

For a certain serving cell, the gNB configures a certain BWP with the following high-level parameters:

1) a subcarrier spacing;

2) CP length;

3) the high level parameter locationandBandwidth indicates the BWP relative to the resource grid starting CRB

Offset value of (RB)_start) And the number L of consecutive CRBs in the BWP frequency domain_RBSatisfy the following requirements

Wherein O is_{carri staring}Denotes offset ToCarrier; wherein the parameter locationandBandwidth indicates an RIV (Resource Indication Value). RIV about L_RBAnd RB_startThe calculation relationship is as follows: if it is not

Then

If not, then,

wherein the content of the first and second substances,

and the number of the first and second electrodes,

4) the BWP number;

5) BWP common and BWP specific parameter configuration, such as the configuration of PDCCH and PDSCH of downlink BWP.

The downlink BWP used by the UE when making initial access (initial access) is called initial downlink BWP (initial downlink BWP).

Scenarios for Sidelink communications

1) Out-of-Coverage (Out-of-Coverage) sidelink communication: neither UE performing sidelink communication has network coverage (e.g., the UE does not detect any cell satisfying the "cell selection criterion" on the frequency on which the sidelink communication is required, indicating that the UE has no network coverage).

2) Network Coverage (In-Coverage) side communication: both UEs performing sidelink communications have network coverage (e.g., the UE detects at least one cell satisfying the "cell selection criteria" on the frequency on which the sidelink communications are desired, indicating that the UE has network coverage).

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

From the UE side, the UE has only two scenarios, namely, network coverage and non-network coverage. Partial network coverage is described from the perspective of sidelink communications.

NR V2X unicast (unicast), multicast(groupcast) and broadcast (broadcast)

In the existing LTE V2X communication, only broadcast communication of a physical layer is supported. Broadcast communication is widely applied to scenes that a base station sends system messages to UE in a cell in cellular communication and the like. The design goals of NR V2X include unicast communication that supports the physical layer, as well as multicast communication. Unicast communication means communication between one transmitting User Equipment (UE) and a single receiving user equipment. Multicast communications generally indicate that a group of UEs are assigned the same Identity (ID), that the UEs transmit V2X data to other UEs within the group, and that the UEs receive V2X data transmitted by other UEs within the group. It is worth pointing out that, in order to better improve the reliability of transmission and improve the spectrum efficiency, HARQ retransmission mechanisms are usually included in unicast communication and multicast communication. HARQ means hybrid automatic retransmission, can provide an error correction function and realize fast retransmission, and is widely used in wireless data communication. The HARQ feedback includes HARQ acks and HARQ NACKs. Wherein, the HARQ ACK indicates that the receiving UE correctly receives and decodes the data of the transmitting UE, and thus the HARQ ACK is fed back; HARQ NACK indicates that the receiving UE did not correctly receive and decode the data of the transmitting UE. When receiving the harq nack fed back by the UE, the sending UE may retransmit the corresponding data to ensure that the reliability of data communication is improved. In NR V2X, HARQ acks and HARQ NACKs are carried by the physical sidelink communications feedback channel (PSFCH).

Basic procedure for LTE V2X (sidelink) communication

Fig. 1 is a schematic diagram illustrating LTE V2X UE sidelink communications. First, the UE1 transmits sidelink communications control information (SCI format 1), carried by the physical layer channel PSCCH, to the UE 2. SCIformat 1 contains scheduling information of the psch, such as time and frequency domain resources of the psch, MCS, and the like. Second, UE1 transmits sidelink communications data to UE2, carried by the physical layer channel PSSCH. The PSCCH and the corresponding PSCCH are frequency division multiplexed, i.e. they are located on the same subframe in the time domain and on different PRBs in the frequency domain. The specific design modes of the PSCCH and the PSSCH are as follows:

1) the PSCCH occupies one subframe in the time domain and two consecutive PRBs in the frequency domain. The initialization of the scrambling sequence takes a predefined value 510. The PSCCH may carry SCI format1, where SCI format1 at least includes time-frequency domain resource information of the PSCCH. For example, for the frequency domain resource indication field, SCI format1 indicates the starting sub-channel number and the number of consecutive sub-channels of the pschs corresponding to the PSCCH.

2) The PSCCH occupies one subframe in the time domain, and the corresponding PSCCH employs Frequency Division Multiplexing (FDM). The PSSCH occupies one or more continuous sub-channels in the frequency domain, and the sub-channels represent n in the frequency domain_subCHsizeA plurality of consecutive PRBs, n_subCHsizeThe number of sub-channels is indicated by the frequency domain resource indication field of SCI format1, configured by RRC parameters.

Resource allocation Mode 3/4 for LTE V2X (when there is eNB network coverage)

Fig. 2 shows two resource allocation schemes of LTE V2X, which are called resource allocation by base station scheduling (Transmission Mode 3) and resource allocation by UE sensing (sensing) (Transmission Mode 4), when there is eNB network coverage on the frequency where sidelink communication is performed. In LTE V2X, when there is eNB network coverage, a base station may configure a resource allocation manner of a UE, or referred to as a transmission mode of the UE, through UE-level proprietary RRC signaling (dedicated RRC signaling) SL-V2X-ConfigDedicated, specifically:

1) resource allocation scheme based on base station scheduling (Transmission Mode 3): the resource allocation mode based on the base station scheduling represents that the time domain and frequency domain resources used by sidelink communication are scheduled by the base station. Specifically, when the RRC signaling SL-V2X-ConfigDedicated is set to scheduled-r14, it indicates that the UE is configured to a transmission mode based on base station scheduling. And the base station configures SL-V-RNTI through RRC signaling, and sends an uplink scheduling permission UL grant to the UE through a PDCCH (DCI format 5A, CRC adopts SL-V-RNTI scrambling). The uplink scheduling grant UL grant at least includes scheduling information of psch time domain and frequency domain resources in sidelink communication. And after the UE successfully monitors the PDCCH scrambled by the SL-V-RNTI, the PSSCH time domain and frequency domain resource indication domain in the uplink scheduling grant UL grant is used as the indication information of the PSSCH time domain and frequency domain resource in the PSCCH (SCI format 1), and the PSCCH (SCI format 1) and the corresponding PSSCH are sent.

2) Resource allocation method based on UE sensing (sensing) (Transmission Mode 4): the UE sensing-based resource allocation means that resources for sidelink communication are based on a UE-aware (sensing) process of a candidate available resource set. The RRC signaling SL-V2X-ConfigDedicated when set to UE-Selected-r14 indicates that the UE is configured to transmit mode based on UE sending. In the UE sensing-based transmission mode, the base station configures an available transmission resource pool, and the UE determines a sidelink transmission resource of the PSCCH in the transmission resource pool (resource pool) according to a certain rule (for a detailed description of the procedure, see LTE V2X UE sensing procedure part), and transmits the PSCCH (SCI format 1) and the corresponding PSCCH.

Transmission Mode 4 for LTE V2X (without eNB network coverage)

When there is no eNB network coverage on the frequency where sidelink communication is performed, LTE V2X only supports the uesending-based resource allocation method, that is, only supports transmission Mode 4. The resource allocation mode based on UE sending represents the sending process of the resource for sidelink communication based on the candidate available resource set by the UE. In the UE sending-based transmission mode, the UE determines the sidelink transmission resource of the PSCCH in a Pre-configured (Pre-Configuration) transmission resource pool (resource pool) according to a certain rule (for a detailed procedure description, see LTE V2X UE sending procedure part), and transmits the PSCCH (SCI format 1) and the corresponding PSCCH.

NR V2X resource allocation modes Mode1 and Mode2

The NR V2X (sidelink) sidelink communication includes at least two resource allocation manners, which are respectively called a mode1 resource allocation manner scheduled by a base station and a mode2 resource allocation manner determined by a UE for sidelink communication resources. The specific definitions of Mode1 and Mode2 are:

1) mode2 (a): UE self-selects sidelink communication resources;

Method for determining PSSCH subframe resource pool (subframe resource pool) by LTE V2X UE

In LTE V2X, the method for determining the subframe resource pool is based on all subframes in the range of SFN #0 to SFN #1023, and the total number of subframes is 10240. The set of subframes that may belong to the resource pool of the V2X UE-transmitted PSSCH subframes is denoted herein as

Satisfies the following conditions:

1)

2) the subframes in the subframe set are numbered with respect to subframe #0 of SFN #0 or DFN #0, that is, subframes in the subframe set are numbered with respect to subframe #0

Corresponds to subframe #0 of SFN #0 or DFN #0,

3) the subframe set includes all subframes excluding the following subframes (subframes included in a, b, and c):

a) the number of subframes in which SLSS is configured is N_SLSS；

b) Downlink subframes and special subframes in a TDD cell, the number of which is denoted N_dssf；

c) A reserved (reserved) subframe, wherein the method for determining the reserved subframe comprises the following steps:

all subframes with subframe numbers 0-10239 except N_SLSSAnd N_dssfAfter one subframe, the remaining (10240-N)_SLSS-N_dssf) The sub-frames are arranged according to the ascending order of the sub-frame numbersMay be represented herein as (l)₀，l₁，...，l₁₀₂₄₀-N_SLSS-N_dssf-₁)。r＝floor(m·(10240-N_SLSS-N_dssf)/N_reserved). Wherein m is 0, 1_reserved-1, and N_reserved＝(10240-N_SLSS-N_dssf)mod L_bitmap。L_bitmapThe length of the bitmap for indicating the resource pool configuration is configured by the upper layer, and the bitmap can be expressed as

Subframe l_rThe subframes with corresponding numbers belong to reserved subframes.

4) And arranging the subframes in the subframe set according to the ascending order of the subframe numbers.

The method for determining the PSSCH subframe resource pool by the UE comprises the following steps: for a set of subframes

Subframe of (1)

If bk, ═ 1, where k' ═ k mod L_bitmapThen subframe

Belonging to the PSSCH sub-frame resource pool.

Reserved resources for LTE V2X Transmission Mode 4(Transmission Mode 4)

In LTE V2X transmission mode 4, when the UE determines through the sending procedure the resources to send sidelink communications, the UE will reserve resources for periodic traffic data. It is assumed that the subframe resource determined by the UE to transmit the PSSCH is represented as a subframe

Then the UE is in the subframe

And (4) reserving resources. Wherein j is 1, 2_re_sel-1，C _resel10 × SL _ RESOURCE _ RESELEMENT _ COUNTER, SL _ RESOURCE _ RESELEMENT _ COUNTER is configured by higher layers_resel＝1。P_{rsvp_TX}′＝P_step×P_{rsvp_TX}/100. LTE V2X includes periodic traffic generated with a period of approximately P_serv100 ms. Wherein, P_stepIs shown at P_servThe number of available uplink subframes. The following table 14.1.1-1 shows P in LTE V2X_stepAnd taking values when different TDD uplinks and downlinks are configured with information. For example, for TDD UL/DL configuration information 2, each system frame contains 2 uplink subframes. At P_servThe service period of 100ms includes 20 uplink subframes. P for edge connection transmission modes 3 and 4 is shown in Table 1_stepThe details of the determination of (2) are shown in the following table.

Table 1

	P_step
		UUDL configuration information 0 for TDD	60
UL/DL configuration information 1 for TDD	40
		UL/DL configuration information 2 for TDD	20
UL/DL configuration information 3 for TDD	30
		UL/DL configuration information 4 for TDD	20
UL/DL configuration information 5 for TDD	10
		UUDL configuration information 6 of TDD	50
Others	100

P_{rsvp_TX}Represents a resource reservation interval (resource reservation interval) indicated by an upper layer.

LTE V2X UE determines resource reservation indication domain in SCI

The resource reservation interval indicated by the upper layer is denoted as P_{rsvp_TX}. The UE determines X-P according to the upper layer indication_{rsvp_TX}With the value of/100, in conjunction with table 2 below, the UE can determine the resource reservation indication field (4-bit indication field) in the SCI.

Table 2

UE perception (sensing) process in LTE V2X Transmission Mode 4(Transmission Mode 4)

For the procedure of UE sending, in summary, in LTE V2X transmission mode 4, the upper layer requests (request) in subframe # n that sidelink data needs to be transmitted, and the UE sends in subframe

The UE determines available resources in the candidate resource set from the sub-frame # (n + T1) to the sub-frame # (n + T2) according to the successfully decoded SCI format 1. Wherein if subframe # n belongs to the set of subframes

Then

If not, then,

indicates that the first subframe after subframe # n belongs to the set of subframes

The subframe of (2). T1 and T2 depend on the specific implementation of the UE.

Each element in the candidate resource set from sub-frame # (n + T1) to sub-frame # (n + T2), i.e. each candidate resource, may be referred to as a candidate menu sub-frame resource (candidate single sub-frame resource), and R is adopted_x，yTo indicate. R_x，yThe specific definition of (A) is:

1) x represents a continuous L in the frequency domain_subCHSub-channel # (x + j), wherein j is 0, 1_subCH-1.

2) v denotes a time domain subframe

The UE assumes any consecutive L belonging to the PSSCH resource pool between sub-frame # (n + T1) to sub-frame # (n + T2)_subCHEach sub-channel corresponds to a candidate single subframe resource. Candidate resource set adoption of S_AAnd (4) showing.

Noting that UE is in a subframe

The resource reservation indication field in the received SCI format1 is P_rsvpRX. If the UE is in a subframe

Received SCI format1 or in subframe

PSSCH resource blocks (resource blocks) and subframe resources indicated in the same SCI format1 received and candidatesSingle subframe resource R_x，y+j×P_{rsvp_TX}When the resource R is overlapped or partially overlapped, the UE will be the candidate single subframe resource R_x，yFrom S_ARemove (excle). Wherein Q is 1, 2,.., Q, and j is 1, 2,.., C_resel-1. If P is_{rsvp_RX}<1 and n' -m.ltoreq.P_step×P_{rsvp_RX}Then Q is 1/P_{rsvp_RX}(ii) a Otherwise, Q is 1.

LTE V2X UE selection synchronization source

A synchronization source (synchronization source) may be referred to simply as a sync source, or simply as a syncreference. In LTE V2X, similar to the mechanism of cellular network communication, if a UE has data to transmit, the UE first needs to synchronize the time domain and the frequency domain. In cellular network communications, the timing relationship (alternatively referred to as timing) of a cell may be determined after a UE receives primary and secondary synchronization signals. Specifically, taking time domain synchronization as an example, in LTE, a UE determines frame synchronization and subframe synchronization from received PSS and SSS; in NR, the UE determines frame synchronization and subframe/slot synchronization according to the number of the synchronization system information block SSB and a predefined mapping manner of the SSB. For V2X or sidelink communications, the UE determines the timing relationship of sidelink or V2X transmission or reception according to the timing relationship of the selected synchronization source. For LTE V2X, the UE needs to select a synchronization source. Possible synchronization sources include:

1)eNB；

2)GNSS；

3)LTE sidelink UE。

the UE determines a Synchronization Source (Synchronization Source) according to a predefined certain priority criterion. The priority criteria include, but are not limited to: the priority of the base station eNB is higher than that of sidelink UE, and the priority of the RSRP of the signals transmitted by the sidelink UE is higher. That is, the UE preferentially selects the base station eNB as the synchronization source compared to the sidelink UE under the same other conditions. In the embodiment of the invention, if the UE is involved in selecting the synchronization source, the default UE determines the synchronization source according to a certain priority criterion.

LTE sidelink Discovery (Discovery) mode

In LTE sidelink, sidelink UEs are supported to send and monitor sidelink Discovery messages (Discovery messages). The discovery message is carried in the physical sidelink communication discovery channel PSDCH. The discovery mode in LTE sidelink is used for mutual discovery between nearby UEs. Two Discovery modes (Discovery modes) are defined in LTE sidelink.

1) Mode A: a discovery mode referred to as "I am here". Two types of UEs are included in mode a.

■ notification type UE (announcing UE): the UE notifies a discovery message, and the adjacent UE can receive and utilize the discovery message to perform sidelink discovery;

■ listening type ue (monitoring ue): and monitoring the adjacent UE of the discovery message sent by the notification type UE.

2) And (3) mode B: is called "who is there? (Who is there)? (Are you Are. Mode B includes two types of UEs.

■ discovery type UE (discover UE): the UE transmits a discovery message. The discovery message includes request information.

■ discoveree UE (discovery UE): the UE receives the request message and replies with information related to the request message.

In the following, a method performed by a user equipment UE in the present invention is described, and specifically, as an example, fig. 3 shows a flowchart of a method 10 performed by a user equipment UE according to an embodiment of the present disclosure.

As shown in fig. 3, in step 11, the UE listens to the first side communication control information SCI sent by other UEs.

For the first SCI, for example, the first SCI may include a CG sequence number, and/or first reserved resource interval indication information. Furthermore, for example, the first SCI may include indication information of time-frequency resources and indication information of the time-frequency resource period or interval. For example, the first SCI may include first time-frequency resource period or interval indication information and/or second time-frequency resource period or interval indication information. Also, for example, the first SCI may contain an indication of a reserved resource period or interval, and/or an indication of a CG period.

In step 12, the used configuration scheduling grant CG is removed from the resource pool of configuration scheduling grants CG based on said first SCI.

In step 13, the user equipment UE selects an unused CG in the CG resource pool and sends a second SCI.

On the condition that the first SCI includes a CG sequence number and/or first reserved resource interval indication information, the UE removes a CG overlapping with a CG corresponding to the CG sequence number from the CG resource pool, and/or removes a CG overlapping with a time-frequency resource indicated by the first reserved resource interval indication information from the CG resource pool. And, the second SCI may include: a sequence number of a CG selected by the UE, and/or a second reserved resource interval indication corresponding to the UE.

In addition, in the case that the first SCI includes indication information of a time-frequency resource and indication information of a time-frequency resource period or interval, the UE removes, from the CG resource pool, a CG overlapping with the time-frequency resource indicated by the indication information of the time-frequency resource period or interval. And, the second SCI may include: an indication of time-frequency resources corresponding to the UE, and/or an indication of time-frequency resource periods or intervals corresponding to the UE.

Furthermore, in case that the first SCI includes first time-frequency resource period or interval indication information and/or second time-frequency resource period or interval indication information, the UE removes, from the CG resource pool, a CG overlapping with a time-frequency resource indicated by the first time-frequency resource period or interval indication information, and/or removes, from the CG resource pool, a CG overlapping with a time-frequency resource indicated by the second time-frequency resource period or interval indication information. And, the second SCI may include: an indication of a period or interval of reserved resources corresponding to the UE, and/or an indication of a period or interval of a CG selected by the UE.

Furthermore, in case the first SCI contains an indication of a reserved resource period or interval, and/or an indication of a CG period, the UE removes from the CG resource pool a CG having a period value greater than the reserved resource period or interval corresponding to the user equipment. And the second SCI may include a period of the CG selected by the UE, and/or a time-frequency resource of the selected CG, and/or a period or interval of a reserved resource corresponding to the UE.

Specific examples, embodiments, and the like according to the present invention will be described in detail below. As described above, the examples and embodiments described in the present disclosure are illustrative for easy understanding of the present invention, and do not limit the present invention.

[ example one ]

Fig. 4 is a diagram illustrating a basic procedure of a method performed by a user equipment according to a first embodiment of the present invention.

The method executed by the ue according to the first embodiment of the present invention is described in detail below with reference to the basic process diagram shown in fig. 4.

As shown in fig. 4, in a first embodiment of the present invention, the steps performed by the user equipment include:

in step S101, the ue listens to the first sidelink communication control information SCI sent by other ues. The first SCI includes a sequence number (index) configuring a scheduling grant Configured Grant (CG).

In step S102, the ue removes (include) a CG overlapping (overlap) with a CG corresponding to the CG sequence number included in the first SCI from a CG pool (CG pool). Overlapping means that the time domain, frequency domain resources partially overlap or completely overlap. The user equipment selects an unused (unused) CG in a CG resource pool.

Optionally, the condition that the user equipment removes the CG from the CG resource pool includes, but is not limited to, the following condition: overlapping (overlap) the CG corresponding to the CG sequence number included in the first SCI. That is, the condition for the user equipment to remove the CG from the CG resource pool may also include other conditions (while satisfying other conditions).

In step S103, the user equipment transmits a second SCI. The second SCI includes a sequence number of the CG selected by the user equipment.

Optionally, in step S102 in the first embodiment of the present invention, another possible implementation manner is that if a certain CG in a CG resource pool overlaps with a CG corresponding to the CG sequence number included in the first SCI, the user equipment determines that the CG is a used (used) CG. Overlapping means that the time domain, frequency domain resources partially overlap or completely overlap. The user equipment selects an unused (unused) CG in a CG resource pool. Alternatively, the condition for the user equipment to determine that the CG is a used CG includes, but is not limited to, the following conditions: overlapping (overlap) the CG corresponding to the CG sequence number included in the first SCI. That is, the condition for the user equipment to determine that the CG is a used CG may include other conditions (while satisfying other conditions).

Optionally, in step S102 in the first embodiment of the present invention, for the CGs corresponding to the CG sequence numbers included in the first SCI, a specific implementation manner is that the CGs have the same sequence numbers, and another specific implementation manner is that: assuming that the CG sequence number included in the first SCI is denoted as m, it represents the mth CG or the m +1 th CG in the CG resource pool of the user equipment. Specific embodiments include, but are not limited to, the two specific embodiments described above.

[ example two ]

Fig. 5 is a diagram showing a basic procedure of a method performed by a user equipment according to a second embodiment of the present invention.

Next, the method executed by the user equipment according to the second embodiment of the present invention is described in detail with reference to the basic process diagram shown in fig. 5.

As shown in fig. 5, in the second embodiment of the present invention, the steps performed by the user equipment include:

in step S201, the ue listens to the first sidelink communication control information SCI sent by other ues. The first SCI includes a sequence number (index) configuring a scheduling grant Configured Grant (CG), and/or reserved resource interval indication information.

In step S202, the ue removes (include) a CG overlapping (overlap) with a CG corresponding to the CG sequence number included in the first SCI from a CG pool (CG pool), and/or removes (include) a CG overlapping with a time-frequency resource indicated by the reserved resource interval indication information included in the first SCI from a CG pool (CG pool). Overlapping means that the time domain, frequency domain resources partially overlap or completely overlap. The user equipment selects an unused (unused) CG in a CG resource pool.

Optionally, the condition that the user equipment removes the CG from the CG resource pool includes, but is not limited to, the following condition: overlap (overlap) with a CG corresponding to the CG sequence number included in the first SCI, and overlap with a time-frequency resource indicated by the reserved resource interval indication information included in the first SCI. That is, the condition for the user equipment to remove the CG from the CG resource pool may also include other conditions (while satisfying other conditions).

In step S203, the user equipment transmits the second SCI. The second SCI includes a sequence number of the CG selected by the ue and/or an indication of a reserved resource interval corresponding to the ue.

Optionally, the indication of the reserved resource interval corresponding to the user equipment is indicated by a higher layer (upper layer).

Optionally, in step S202 in the second embodiment of the present invention, another possible implementation manner is that if a certain CG in a CG resource pool overlaps with a CG corresponding to the CG sequence number included in the first SCI, and/or if a certain CG in the CG resource pool overlaps with a time-frequency resource indicated by the reserved resource interval indication information included in the first SCI, the ue determines that the CG is a used (used) CG. Overlapping means that the time domain, frequency domain resources partially overlap or completely overlap. The user equipment selects an unused (unused) CG in a CG resource pool. Alternatively, the condition for the user equipment to determine that the CG is a used CG includes, but is not limited to, the following conditions: overlap (overlap) with a CG corresponding to the CG sequence number included in the first SCI, and overlap with a time-frequency resource indicated by the reserved resource interval indication information included in the first SCI. That is, the condition for the user equipment to determine that the CG is a used CG may include other conditions (while satisfying other conditions).

Optionally, in step S202 in the second embodiment of the present invention, for the CGs corresponding to the CG sequence numbers included in the first SCI, a specific implementation manner is that the CGs have the same sequence number, and another specific implementation manner is that: assuming that the CG sequence number included in the first SCI is denoted as m, it represents the mth CG or the m +1 th CG in the CG resource pool of the user equipment. Specific embodiments include, but are not limited to, the two specific embodiments described above.

[ third example ]

Fig. 6 is a diagram showing a basic procedure of a method performed by a user equipment according to a third embodiment of the present invention.

Next, the method executed by the user equipment according to the third embodiment of the present invention is described in detail with reference to the basic process diagram shown in fig. 6.

As shown in fig. 6, in the third embodiment of the present invention, the steps performed by the user equipment include:

in step S301, the ue listens to the first sidelink communication control information SCI sent by other ues. The first SCI includes reserved resource interval indication information.

In step S302, the ue removes (include) a CG overlapping the time-frequency resource indicated by the reserved resource interval indication information contained in the first SCI from a CG resource pool (CG pool). Overlapping means that the time domain, frequency domain resources partially overlap or completely overlap. The user equipment selects an unused (unused) CG in a CG resource pool.

Optionally, the condition that the user equipment removes the CG from the CG resource pool includes, but is not limited to, the following condition: overlapping with time-frequency resources indicated by the reserved resource interval indication information included in the first SCI. That is, the condition for the user equipment to remove the CG from the CG resource pool may also include other conditions (while satisfying other conditions).

The user equipment transmits the second SCI at step S303. The second SCI includes an indication of a reserved resource interval corresponding to the user equipment.

Optionally, in step S302 in the third embodiment of the present invention, another possible implementation manner is that if a certain CG in a CG resource pool overlaps with a time-frequency resource indicated by the reserved resource interval indication information included in the first SCI, the ue determines that the CG is a used (used) CG. Overlapping means that the time domain, frequency domain resources partially overlap or completely overlap. The user equipment selects an unused (unused) CG in a CG resource pool. Alternatively, the condition for the user equipment to determine that the CG is a used CG includes, but is not limited to, the following conditions: overlapping with time-frequency resources indicated by the reserved resource interval indication information included in the first SCI. That is, the condition for the user equipment to determine that the CG is a used CG may include other conditions (while satisfying other conditions).

[ example four ]

Fig. 7 is not intended to illustrate a basic procedure of a method performed by a user equipment of the fourth embodiment of the present invention.

Next, a method executed by the user equipment according to the fourth embodiment of the present invention is described in detail with reference to the basic process diagram shown in fig. 7.

As shown in fig. 7, in the fourth embodiment of the present invention, the steps performed by the user equipment include:

in step S401, the ue listens for the first sidelink communication control information SCI sent by other ues. The first SCI includes an indication of a time frequency resource and/or a period or interval indication of the time frequency resource.

Optionally, the time-frequency resource may be a reserved resource or a resource of CG.

In step S402, the ue removes (include) a CG overlapping the time-frequency resource period or interval indication information included in the first SCI from a CG resource pool (CG pool). Overlapping means that the time domain, frequency domain resources partially overlap or completely overlap. The user equipment selects an unused (unused) CG in a CG resource pool.

Optionally, the condition that the user equipment removes the CG from the CG resource pool includes, but is not limited to, the following condition: overlap with the time frequency resource indicated by the time frequency resource period or interval indication information contained in the first SCI. That is, the condition for the user equipment to remove the CG from the CG resource pool may also include other conditions (while satisfying other conditions).

The user equipment transmits the second SCI at step S403. The second SCI includes an indication of a time-frequency resource and/or an indication of a period or interval of the time-frequency resource.

Optionally, the time-frequency resource may be a reserved resource corresponding to the ue, or a resource of a CG selected by the ue.

Optionally, in step S402 in the fourth embodiment of the present invention, another possible implementation manner is that if a certain CG in a CG resource pool overlaps with a time-frequency resource indicated by the time-frequency resource period or interval indication information included in the first SCI, the user equipment determines that the CG is a used (used) CG. Overlapping means that the time domain, frequency domain resources partially overlap or completely overlap. The user equipment selects an unused (unused) CG in a CG resource pool. Alternatively, the condition for the user equipment to determine that the CG is a used CG includes, but is not limited to, the following conditions: overlap with the time frequency resource indicated by the time frequency resource period or interval indication information contained in the first SCI. That is, the condition for the user equipment to determine that the CG is a used CG may include other conditions (while satisfying other conditions).

[ example five ]

Fig. 8 is a diagram illustrating a basic procedure of a method performed by a user equipment according to a fifth embodiment of the present invention.

Next, the method executed by the user equipment according to the fifth embodiment of the present invention is described in detail with reference to the basic process diagram shown in fig. 8.

As shown in fig. 8, in a fifth embodiment of the present invention, the steps performed by the user equipment include:

in step S501, the ue listens for the first sidelink communication control information SCI sent by other ues. The first SCI includes period or interval indication information of the first time-frequency resource, and/or period or interval indication information of the second time-frequency resource.

Optionally, the first time-frequency resource may be a reserved resource or a resource of a CG.

Optionally, the second time-frequency resource may be a reserved resource or a resource of CG.

In step S502, the ue removes (include) the CG overlapping the time-frequency resource indicated by the first time-frequency resource period or interval indication information included in the first SCI from a CG resource pool (CG pool), and/or removes (include) the CG overlapping the time-frequency resource indicated by the second time-frequency resource period or interval indication information included in the first SCI from a CG resource pool (CG pool). Overlapping means that the time domain, frequency domain resources partially overlap or completely overlap. The user equipment selects an unused (unused) CG in a CG resource pool.

Optionally, the condition that the user equipment removes the CG from the CG resource pool includes, but is not limited to, the following condition: the first SCI is overlapped with the time frequency resource indicated by the first time frequency resource period or interval indication information contained in the first SCI, and is overlapped with the time frequency resource indicated by the second time frequency resource period or interval indication information contained in the first SCI. That is, the condition for the user equipment to remove the CG from the CG resource pool may also include other conditions (while satisfying other conditions).

In step S503, the user equipment transmits the second SCI. The second SCI includes an indication of a period or interval of reserved resources corresponding to the ue and/or an indication of a period or interval of a CG selected by the ue.

Optionally, in step S502 of the fifth embodiment of the present invention, another possible implementation manner is that if a certain CG in a CG resource pool overlaps with a time-frequency resource indicated by the first time-frequency resource period or interval indication information included in the first SCI, and/or if a certain CG in the CG resource pool overlaps with a time-frequency resource indicated by the second time-frequency resource period or interval indication information included in the first SCI, the ue determines that the CG is a used (used) CG. Overlapping means that the time domain, frequency domain resources partially overlap or completely overlap. The user equipment selects an unused (unused) CG in a CG resource pool. Alternatively, the condition for the user equipment to determine that the CG is a used CG includes, but is not limited to, the following conditions: the first SCI is overlapped with the time frequency resource indicated by the first time frequency resource period or interval indication information contained in the first SCI, and is overlapped with the time frequency resource indicated by the second time frequency resource period or interval indication information contained in the first SCI. That is, the condition for the user equipment to determine that the CG is a used CG may include other conditions (while satisfying other conditions).

[ sixth example ]

In a sixth embodiment of the present invention, a user equipment performs steps including:

in step S601, the ue listens to the first sidelink communication control information SCI sent by other ues. The first SCI includes reserved resource period (period) or interval (interval) indication information, and/or an indication of a CG period.

At step S602, the user equipment transmits a second SCI. The second SCI includes a CG period selected by the ue, and/or a time-frequency resource of the selected CG, and/or a period or interval of a reserved resource corresponding to the ue.

Optionally, the period of reserved resources corresponding to the user equipment is indicated by a higher layer (upper layer).

[ seventh example ]

In a seventh embodiment of the present invention, the user equipment performs steps including:

in step S701, the ue listens for the first sidelink communication control information SCI sent by other ues. The first SCI includes reserved resource period (period) or interval (interval) indication information, and/or an indication of a CG period.

In step S702, the ue removes (include) a CG having a period value greater than a reserved resource period or interval corresponding to the ue from a CG pool (CG pool).

Optionally, the reserved resource period or interval corresponding to the user equipment is indicated by a higher layer (upper layer).

Optionally, when the ue selects an unused (unused) CG, it is assumed that a priority of a CG having a period value greater than a reserved resource period or interval corresponding to the ue is lower than a priority of a CG having a period value less than or equal to a reserved resource period or interval corresponding to the ue.

Optionally, the ue preferentially selects a CG with a period value equal to a reserved resource period or interval corresponding to the ue.

The user equipment transmits the second SCI at step S703. The second SCI includes a CG period selected by the ue, and/or a time-frequency resource of the selected CG, and/or a period or interval of a reserved resource corresponding to the ue.

[ eighth example ]

In an eighth embodiment of the present invention, a user equipment performs steps including:

in step S801, the user equipment receives cell configuration information. The cell configuration information includes configuration information of MCG and/or configuration information of SCG.

Optionally, the configuration information of the MCG includes a serving frequency of the MCG.

Optionally, the configuration information of the SCG includes a serving frequency of the SCG and/or configuration information of the PSCell.

In step S802, if the frequency of the sidelink communication performed by the user equipment belongs to (tune), or is equal to the serving frequency of the MCG (serving frequency of LTE), the user equipment selects the eNB as the synchronization source.

Optionally, the serving frequency of LTE includes a carrier frequency (carrierfrequency) of the PCell and/or SCell.

Optionally, if the frequency of the sidelink communication belongs to (conn), or is equal to Primaryfrequency, the user equipment selects PCell as a synchronization reference cell (sync reference cell). Optionally, the user equipment is in an RRC connected state (RRC connected) in the PCell.

Alternatively, if the frequency of the sidelink communication belongs to (received), or is equal to second frequency, the user equipment selects a corresponding (received) secondary cell SCell as a synchronization reference cell (sync reference cell).

In step S803, if the frequency of the sidelink communication by the user equipment belongs to (conn), or is equal to the serving frequency of the SCG (serving frequency of NR), the user equipment selects the gNB as the synchronization source.

Optionally, the serving frequency of the NR comprises a carrier frequency (carrierfrequency) of the PSCell and/or SCell.

Optionally, if the frequency of the sidelink communication belongs to (con), or is equal to the serving frequency of the PSCell, the user equipment selects the PSCell as a synchronization reference cell (sync refer cell). Optionally, the user equipment is in an RRC connected state (RRC connected) in the PSCell.

Optionally, if the frequency of the sidelink communication belongs to (connected), or is equal to the serving frequency of the SCell, the user equipment selects the corresponding (connected) secondary cell SCell as a synchronization reference cell (sync reference cell).

In step S804, if the frequency of the sidelink communication performed by the user equipment does not belong to (or is not equal to) the serving frequency of LTE and does not belong to (or is not equal to) the serving frequency of NR, the user equipment preferentially selects eNB as the synchronization source, or preferentially selects gNB as the synchronization source, or the user equipment assumes that the priorities of eNB and gNB are the same.

Alternatively, a complete alternative implementation of embodiment eight of the present invention is that, if NR sidelink UE is configured with NR SCG (IE: NR-second cell group pconfig, or can be described as in EN-DC), if the sidelink UE selects eNB as synchronization source and if the frequency of sidelink UE for sidelink communication belongs to (conner), or is equal to Primary frequency, then the user equipment selects PCell as synchronization reference cell (sync reference cell). Optionally, if the sidelink UE selects an eNB as a synchronization source and if the frequency of the sidelink communication belongs to (continuing), or is equal to (subsequent frequency), the user equipment selects a corresponding (continuing) Secondary cell SCell as a synchronization reference cell (sync reference cell). If the sidelink UE selects the gNB as the synchronization source and if the frequency of sidelink communications by the sidelink UE belongs to (contention), or is equal to the serving frequency of the PSCell, then the user equipment selects the PSCell as a synchronization reference cell (sync reference cell). Optionally, if the sidelink UE selects a gNB as a synchronization source and if the frequency of the sidelink communication belongs to (conn), or is equal to the serving frequency of the SCell, then the user equipment selects the corresponding (conned) secondary cell SCell as a synchronization reference cell (sync reference cell).

Alternatively, another complete alternative implementation manner of embodiment eight of the present invention is that, if the sidelink UE configures NR SCG (IE: NR-second cell group config, or can be described as in EN-DC), the base station is configured through RRC signaling, or the UE is pre-configured (pre-configured), or the UE is pre-defined to select eNB as the synchronization source, or the UE selects gb as the synchronization source.

[ example nine ]

In a ninth embodiment of the present invention, a user equipment performs the steps including:

in step S901, the ue receives sidelink configuration information sent by the base station. The sidelink configuration information includes an indication whether to feed back HARQ ACK, and/or PSFCH resource information fed back by HARQ.

Optionally, the ue determines whether to feed back HARQ ACK according to preconfigured information, or the ue preconfigured information whether to feed back HARQ ACK.

Optionally, the user equipment pre-configures the PSFCH resource information for HARQ feedback.

Optionally, specific implementation manners of the indication whether to feed back the HARQ ACK and the information preconfigured whether to feed back the HARQ ACK include, but are not limited to:

1) configuring through RRC signaling, or, an information element in the pre-configuration information; alternatively, the first and second electrodes may be,

2) configuring or pre-configuring PSFCH resources for HARQ ACK by individual (additional or partial); alternatively, the base station may separately configure or the user equipment separately pre-configures the PSFCH resource for HARQ NACK.

In step S902, the ue determines HARQ feedback resources according to the indication of whether to feed back HARQ ACK, and/or the PSFCH resource information fed back by HARQ, and performs HARQ feedback. If the base station configures or the user equipment pre-configures feedback HARQ ACK, or sends the user equipment indication to feed back the HARQ ACK, the user equipment performs HARQ ACK feedback and HARQ NACK feedback; otherwise, the user equipment performs HARQ NACK feedback.

Optionally, in step S901 of the ninth embodiment, an alternative implementation is that the user equipment receives and sends indication information of the user equipment. The indication information comprises an indication whether HARQ ACK is fed back or not, and/or PSFCH resource indication information fed back by HARQ. Specific implementation manners of the indication information of whether to feed back the HARQ ACK include, but are not limited to:

1) possible embodiments include indication field indication in SCI, or CRC scrambling indication of PSCCH, by PSCCH, i.e. SCI indication; alternatively, the first and second electrodes may be,

2) indicating PSFCH resources of HARQ ACK through single (additional or partial) to indicate that the user equipment needs to feed back the HARQ ACK; alternatively, the first and second electrodes may be,

3) the Discovery Message may be carried in PSDCH, or psch, or PSCCH, or PSBCH, as indicated by a Discovery Message (Discovery Message).

Alternatively, the first and second electrodes may be,

4) in the connection setup (connection setup or establishment) process, the sending user equipment indicates or coordinates (coordination or coordination) whether to feed back HARQ ACK through higher layer signaling (RRC signaling or AS signaling).

[ example ten ]

In a tenth embodiment of the present invention, a user equipment performs steps including:

in step S1001, the user equipment receives sidelink configuration information transmitted by the base station. The sidelink configuration information includes an indication whether to feed back HARQ ACK, and/or PSFCH resource information fed back by HARQ.

In step S1002, the user equipment receives indication information of the transmitting user equipment. The indication information comprises an indication whether HARQ ACK is fed back or not, and/or PSFCH resource indication information fed back by HARQ. Specific implementation manners of the indication information of whether to feed back the HARQ ACK include, but are not limited to:

Alternatively, the first and second electrodes may be,

In step S1003, if the base station configures or pre-configures the user equipment to feed back the HARQ ACK and the transmitting user equipment instructs the user equipment to feed back the HARQ ACK, the user equipment performs HARQ ACK feedback and HARQ NACK feedback. Otherwise, the user equipment performs HARQ NACK feedback.

[ example eleven ]

In an eleventh embodiment of the present invention, a user equipment performs steps including:

in step S1101, configuration information related to the initial BWP, for example, transmitted by the gNB, is received. For example, a starting resource block of a carrier where the initial BWP sent by the gNB is located and an offset of the initial BWP with respect to the starting resource block of the carrier are received.

Alternatively, the configuration information related to the initial BWP may be all UE-specific configuration information, or all cell-specific configuration information, or part of the UE-specific configuration information and part of the cell-specific configuration information.

Optionally, the starting resource block may be configured by parameter offsetttocarrier in SCS-specific carrier IE; other configuration information of the carrier where the initial BWP is located may also be configured through the parameters in the SCS-specific carrier IE, for example, the subcarrier spacing of the carrier where the initial BWP is located is configured by the parameter subanticrierspaced in the SCS-specific carrier IE.

Optionally, if the initial BWP is an initial downlink BWP, the SCS-specific carrier IE may be included in a parameter downlinkchannel bw-PerSCS-List in a ServingCellConfig IE.

Optionally, if the initial BWP is an initial upstream BWP, the SCS-specific carrier IE may be contained in an uplinkconbw-SCS-List in a parameter uplinkConfig in a ServingCellConfig IE.

Optionally, the offset of the initial BWP with respect to the starting resource block of the carrier may be configured by a parameter location andbandwidth, or configured by a parameter location, or configured by a parameter of another name. Optionally, the parameter locationandBandwidth may represent a Resource Indication Value (RIV) corresponding to a resource block offset RB_startAnd a length L_RB. The resource block offset RB_startFor indicating an offset of the initial BWP relative to a starting resource block of the carrier. Optionally, the parameter location may represent a resource block offset RB_start. The parameter may be in the servingCellConfig IE, servingCellConfig->The parameters are set to be in accordance with the parameters,

or, in the IE (e.g., BWP) corresponding to the parameter (e.g., initialDownlinkB WP) in the ServingCellConfig IE, the specific configuration is the parameter ServingCellConfig- > initialdowinlinkbwp- >,

or, in an IE (e.g., BWP-DownlinkCommon) corresponding to a parameter (e.g., initialldownlinlinkbwp) in the ServingCellConfig IE, the specific configuration is that the ServingCellConfig- > initialldownlinlinkbwp- > geneticparameters- > said parameter,

or, in the IE (e.g., BWP) corresponding to the parameter (e.g., BWP) in the ServingCellConfig IE, the specific configuration is ServingCellConfig- > BWP- > said parameter,

or, in the IE (e.g., BWP) corresponding to the parameter (e.g., genericParameters) in the ServingCellConfig IE, the specific configuration is ServingCellConfig- > genericParameters- > said parameter,

or, in an IE (e.g., BWP-DownlinkCommon) corresponding to a parameter (e.g., BWP-DownlinkCommon) in the ServingCellConfig IE, the specific configuration is that the parameter is ServingCellConfig- > BWP-DownlinkCommon- > geneticParameters- >,

or, in an IE (e.g., downlinkConfigCommon) corresponding to a parameter (e.g., downlinkConfigCommon) in the ServingCellConfig IE, a specific configuration is that the parameter is ServingCellConfig- > downlinkConfigCommon- > initialdownlinlnpp- > genericParameters-.

In step S1102, a starting resource block of the initial BWP is determined according to the configuration information related to the initial BWP.

For example, if the initial resource block of the carrier where the initial BWP is located is O_carrier(in common resource block numbering), the initial BWP is RB from the starting resource block of the carrier_startThen the starting resource block (represented by a common resource block number) of the initial BWP is

Optionally, in an eleventh embodiment of the present invention, the resource block may be a common resource block CRB.

Fig. 9 is a block diagram showing a user equipment UE according to the present invention. As shown in fig. 9, the user equipment UE80 includes a processor 801 and a memory 802. The processor 801 may include, for example, a microprocessor, microcontroller, embedded processor, or the like. The memory 802 may include, for example, volatile memory (e.g., random access memory RAM), a Hard Disk Drive (HDD), non-volatile memory (e.g., flash memory), or other memory, among others. The memory 802 has stored thereon program instructions. Which when executed by the processor 801 may perform the above-described method performed by the user equipment as described in detail herein.

The method of the invention and the apparatus involved have been described above in connection with preferred embodiments. It will be appreciated by those skilled in the art that the above illustrated approaches are exemplary only, and that the various embodiments described above can be combined with each other without conflict. The method of the present invention is not limited to the steps or sequence shown above. The network nodes and user equipment shown above may comprise further modules, e.g. modules that may be developed or developed in the future, which may be available to a base station, MME, or UE, etc. The various identifiers shown above are exemplary only and not limiting, and the invention is not limited to the specific information elements that are examples of these identifiers. Many variations and modifications may occur to those skilled in the art in light of the teachings of the illustrated embodiments.

It should be understood that the above-described embodiments of the present invention can be implemented by software, hardware, or a combination of both software and hardware. For example, various components within the base station and the user equipment in the above embodiments may be implemented by various means, including but not limited to: analog 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, a "base station" may refer to a mobile communication data and control switching center with a large transmission power and a wide coverage area, and includes functions of resource allocation scheduling, data receiving and transmitting, and the like. "user equipment" may refer to a user mobile terminal, including, for example, a mobile phone, a notebook, etc., which may wirelessly communicate with a base station or a micro base station.

Furthermore, embodiments of the invention disclosed herein may be implemented on a computer program product. More specifically, the computer program product is one of the following: there is a computer readable medium having computer program logic encoded thereon that, when executed on a computing device, provides related operations for implementing the above-described aspects 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 embodiments of the present invention. Such arrangements of the invention are typically provided as downloadable software images, shared databases, etc. arranged or encoded in software, code and/or other data structures on a computer readable medium such as an optical medium (e.g., CD-ROM), floppy or hard disk or other medium such as firmware or microcode on one or more ROM or RAM or PROM chips or in one or more modules. The software or firmware or such configurations may be installed on a computing device to cause one or more processors in the computing device to perform the techniques described in embodiments of the present invention.

Further, each functional block or respective feature of the base station device and the terminal device used in each of the above embodiments may be implemented or executed by a circuit, which is typically one or more integrated circuits. Circuitry 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, discrete gate or transistor logic, or discrete hardware components, or any combination thereof. A general-purpose processor may be a microprocessor, or the processor may be an existing processor, controller, microcontroller, or state machine. The general-purpose processor or each circuit described above may be configured by a digital circuit, or may be configured by a logic circuit. Further, when advanced technology capable of replacing the current integrated circuit is developed due to the advancement of semiconductor technology, the present invention can also use the integrated circuit obtained by the advanced technology.

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

Claims

1. A method performed by a User Equipment (UE), comprising:

the UE monitors first side communication control information SCI sent by other user equipment UE;

removing a used configuration scheduling grant CG from a configuration scheduling grant CG resource pool based on the first SCI; and

the UE selects an unused CG in the CG resource pool and sends a second SCI.

2. The method of claim 1, wherein,

the first SCI includes: a CG sequence number, and/or first reserved resource interval indication information,

the UE removes the CG which is overlapped with the CG corresponding to the CG sequence number from the CG resource pool, and/or removes the CG which is overlapped with the time-frequency resource indicated by the first reserved resource interval indication information from the CG resource pool.

3. The method of claim 2, wherein,

the second SCI includes: a sequence number of a CG selected by the UE, and/or a second reserved resource interval indication corresponding to the UE.

4. The method of claim 1, wherein,

the first SCI includes: indication information of time frequency resources and the time frequency resource period or interval indication information,

and the UE removes the CG which is overlapped with the time-frequency resource indicated by the time-frequency resource period or interval indication information from the CG resource pool.

5. The method of claim 4, wherein,

the second SCI includes: an indication of time-frequency resources corresponding to the UE, and/or an indication of time-frequency resource periods or intervals corresponding to the UE.

6. The method of claim 1, wherein,

the first SCI includes: first time frequency resource period or interval indication information and/or second time frequency resource period or interval indication information,

and the UE removes the CG which is overlapped with the time-frequency resource indicated by the first time-frequency resource period or interval indication information from the CG resource pool, and/or removes the CG which is overlapped with the time-frequency resource indicated by the second time-frequency resource period or interval indication information from the CG resource pool.

7. The method of claim 6, wherein,

the second SCI includes: an indication of a period or interval of reserved resources corresponding to the UE, and/or an indication of a period or interval of a CG selected by the UE.

8. The method of claim 1, wherein,

the first SCI contains an indication of a reserved resource period or interval and/or an indication of a CG period,

the UE removes the CG with the cycle value larger than the reserved resource cycle or interval corresponding to the user equipment from the CG resource pool,

the second SCI includes a CG period selected by the UE, and/or a time-frequency resource of the selected CG, and/or a period or interval of a reserved resource corresponding to the UE.

9. The method of claim 7 or 8,

the overlap means that time domain and frequency domain resources are partially overlapped or completely overlapped,

the period or interval of the reserved resources corresponding to the UE is indicated by an upper layer.

10. A user equipment, UE, comprising:

a processor; and

a memory storing instructions;

wherein the instructions, when executed by the processor, perform the method of any of claims 1 to 9.