WO2020169067A1 - Method executed by user equipment, and user equipment - Google Patents

Abstract

The invention provides a method executed by user equipment, and user equipment. The method comprises: user equipment (UE) monitoring first sidelink control information (SCI) sent by another UE; removing, on the basis of the first SCI, used configured grants (CG) from a CG resource pool; and the UE selecting an unused CG from the CG resource pool, and sending second SCI.

Description

Method executed by user equipment and user equipment Technical field

The present invention relates to the field of wireless communication technology, and in particular to methods executed by user equipment and corresponding user equipment.

Background technique

In traditional cellular networks, all communications must pass through base stations. The difference is that D2D communication (Device-to-Device communication, device-to-device direct communication) refers to a direct communication method between two user devices without being forwarded by a base station or core network. At the RAN#63 plenary meeting of the 3rd Generation Partnership Project (3rd Generation Partnership Project, 3GPP) in March 2014, the research topic on the use of LTE equipment to achieve near D2D communication services was approved (see Non-Patent Document 1). LTE Release 12 The functions introduced by D2D include:

1) Discovery between neighboring devices in LTE network coverage scenarios (Discovery);

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

3) The upper layer supports Unicast and Groupcast communication functions.

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

1) D2D discovery of scenarios without network coverage and partial network coverage;

2) The priority processing mechanism of D2D communication.

Based on the design of the D2D communication mechanism, at the RAN#68 plenary meeting of 3GPP in June 2015, the V2X feasibility study topic based on D2D communication was approved. V2X stands for Vehicle to Everything. It hopes to realize the information interaction between vehicles and all entities that may affect vehicles. The purpose is to reduce accidents, alleviate traffic congestion, reduce environmental pollution and provide other information services. The application scenarios of V2X mainly include 4 aspects:

1) V2V, Vehicle to Vehicle, that is, vehicle-to-vehicle communication;

2) V2P, Vehicle to Pedestrian, that is, the vehicle sends a warning to pedestrians or non-motorized vehicles;

3) V2N, Vehicle to Network, that is, the vehicle connects to the mobile network;

4) V2I, Vehicle to Infrastructure, that is, communication between vehicles and road infrastructure.

3GPP divides the research and standardization of V2X into three stages. The first phase was completed in September 2016, mainly focused on V2V, based on LTE Release 12 and Release 13 D2D (also called 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 PC5 interface. The PC5 interface is mainly used to solve the problem of cellular car networking communication in high-speed (up to 250 km/h) and high-node density environments. Vehicles can interact with information such as position, speed and direction through the PC5 interface, that is, vehicles can communicate directly through the PC5 interface. Compared with the proximity communication between D2D devices, the functions introduced by LTE Release 14 V2X mainly include:

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

2) Introduce sub-channels to enhance resource allocation methods;

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

The second phase of the V2X research topic belongs to the research category of LTE Release 15 (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 of the V2X feasibility study project based on 5G NR network technology (see Non-Patent Document 5) was approved. The research plan of this subject includes the design of the sidelink resource allocation method (or called the sidelink transmission mode). At the 3GPP RAN1#94 meeting in August 2018 (see Non-Patent Document 6), sidelink side-line communication includes at least two resource allocation methods, namely mode 1 resource allocation method based on base station scheduling and mode 2 UE determines sidelink communication Resource allocation method of resources. The specific definitions of Mode 1 and Mode 2 are:

1) Mode 1: The resources used by the base station for scheduling UE sidelink communication;

2) Mode 2: The UE determines the resources used for sidelink communication among the resources configured or pre-configured by the base station.

Among them, Mode 2 includes 4 sub-modes, which are defined as mode 2 (a), (b), (c), (d). The specific definitions of the 4 sub-modes included in Mode 2 are:

1) Mode 2(a): UE selects the resources of sidelink communication by itself;

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

3) Mode 2(c): The base station configures the UE NR type 1 (NR type 1) configuration scheduling grant (configured grant, which can be referred to as CG for short);

4) Mode 2(d): The UE schedules resources for other UEs for sidelink communication.

In the AH#1901 meeting of 3GPP RAN1 in January 2019 (see Non-Patent Document 7), it was discussed and supported NR type 1 and NR type 2 (NR type 2) configuration scheduling permissions through Mode 1 resource allocation. Specifically, when the NR base station gNB schedules the UE to perform sidelink communication in mode 1, the gNB can configure the CG of NR type 1 and NR type 2 for the UE. At the same time, in this meeting, for the mode 2(c) resource allocation method, when the base station configures one or more CGs for the UE, the UE selects an unused CG according to the result of perception.

The solution of the present invention is mainly aimed at the resource allocation mode mode 2(c), the method for the NR sidelink UE to select an unused CG, and when the NR sidelink UE selects the CG used for sidelink communication, setting the sidelink control information related to the CG Domain method. At the same time, the solution of the present invention also includes a method in which the NR sidelink UE sets the field related to the CG in the sidelink control information in the resource allocation mode mode 1.

At the 3GPP RAN1#94bis meeting in October 2018, the design of the NR V2X synchronization mechanism contained the following two conclusions (see Non-Patent Document 8):

1) For NR sidelink UE, eNB is supported as synchronization source (synchronization source, or sync source for short, or sync reference for short), that is, NR sidelink UE can select eNB as synchronization source;

2) For NR sidelink, it supports the eNB to control the resource allocation mode (NR V2X resource allocation mode2) selected by the UE in the NR sidelink, that is, the eNB broadcasts the semi-static configuration information of NR V2X resource allocation mode2.

When the NR sidelink UE selects the synchronization source, if the NR sidelink UE can select gNB or eNB as the sync reference, the solution 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 meeting of 3GPP RAN1 in January 2019 (see Non-Patent Document 7), the design of the HARQ feedback mechanism for NR V2X multicast (groupcast) includes the following conclusions: For groupcast communication, when HARQ feedback is enabled, Two HARQ feedback mechanisms are supported, namely: 1) the receiving UE only feeds back HARQ NACK; 2) the receiving UE feeds back HARQ ACK and NACK.

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

In Rel-15 NR, the UE is based on the offset value of the carrier (or resource grid) relative to point A and the offset value of the initial downlink bandwidth segment (initial DL BWP) relative to the starting CRB of the carrier (or resource grid) Determine the starting CRB number of the initial downlink bandwidth segment. In addition, NR supports the base station to configure UE-specific channel bandwidth (channel bandwidth, also called carrier, or resource grid) through dedicated signaling (dedicated signaling). After the base station configures the UE-specific channel bandwidth, the UE-specific channel bandwidth parameter will overwrite the cell-specific corresponding parameter configuration. In the current 3GPP protocol, gNB only configures the UE-specific carrier (or resource grid) with an offset value relative to point A, and does not configure the UE's initial downlink BWP relative to the carrier (or Resource grid) the offset value of the starting CRB. The solution of the present invention provides a method for the base station to configure the UE-specific initial downlink BWP relative to the carrier (or resource grid) initial CRB offset value through dedicated signaling.

Prior art literature

Non-patent literature

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

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

Non-Patent Document 3: RP-152293, New WI proposal: Support for V2V services based on 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, Chairman notes, section 7.2.4.1.4

Non-Patent Document 7: RAN1AH#1901, Chairman notes, section 7.2.4.1.4, section 7.2.4.3

Non-Patent Document 8: RAN1#94bis, Chairman notes, section 7.2.4.1.3

Summary of the invention

In order to solve at least part of the above-mentioned problems, the present invention provides a method executed by a user equipment and a user equipment.

According to a first aspect of the present invention, there is provided a method executed by a user equipment UE, including: the UE monitors the first side-line communication control information SCI sent by other user equipment UE; and based on the first SCI, from the configuration scheduling The used configuration scheduling permission CG is removed from the permitted CG resource pool; 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 from the CG resource pool the CG that overlaps with the CG sequence number The CG, and/or, remove from the CG resource pool the CG that overlaps the time-frequency resource indicated by the first reserved resource interval indication information.

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

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

In the above method, the second SCI may include: an indication corresponding to the time-frequency resource of the UE, and/or an indication corresponding to the time-frequency resource period or interval of 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 the data from the CG resource pool. CGs that overlap the time-frequency resources indicated by the first time-frequency resource period or interval indication information, and/or remove from the CG resource pool and the second time-frequency resource period or interval indication information CGs where the indicated time-frequency resources overlap.

In the above method, the second SCI may include: an indication of the period or interval of the reserved resource corresponding to the UE, and/or an indication of the period or interval of the 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, and the UE removes a period from the CG resource pool with a value greater than that corresponding to the user equipment. A CG that reserves a resource period or interval, the second SCI includes the period of the CG selected by the UE, and/or the time-frequency resource of the selected CG, and/or the period of the reserved resource corresponding to the UE, or interval.

In the above method, the overlap may indicate that time domain and frequency domain resources partially overlap or completely overlap, and the period or 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, including: a processor; and a memory storing instructions; wherein, when the instructions are executed by the processor, the method in the user equipment according to the context is executed .

Description of the drawings

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

Fig. 1 is a schematic diagram showing LTE V2X UE side-line communication.

Fig. 2 is a schematic diagram showing the resource allocation mode of LTE V2X when there is eNB network coverage.

Fig. 3 is a flowchart showing a method executed by a user equipment based on the present invention.

FIG. 4 is a schematic diagram showing the basic process of the method executed by the user equipment in the first embodiment of the present invention.

Fig. 5 is a schematic diagram showing the basic process of the method executed by the user equipment in the second embodiment of the present invention.

FIG. 6 is a schematic diagram showing the basic process of the method executed by the user equipment in the third embodiment of the present invention.

FIG. 7 is a schematic diagram showing the basic process of the method executed by the user equipment in the fourth embodiment of the present invention.

FIG. 8 is a schematic diagram showing the basic process of the method executed by the user equipment in the fifth embodiment of the present invention.

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

detailed description

The present invention will be described in detail below with reference to the drawings and specific implementations. 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 that are not directly related to the present invention are omitted to prevent confusion in the understanding of the present invention.

Hereinafter, taking the 5G mobile communication system and its subsequent evolved versions as an example application environment, multiple embodiments according to the present invention are described in detail. However, it should be pointed out that the present invention is not limited to the following embodiments, but can be applied to more other wireless communication systems, such as communication systems after 5G and 4G mobile communication systems before 5G.

The following describes some terms involved in the present invention. Unless otherwise specified, the terms involved in the present invention are defined here. The terminology given in the present invention may adopt different naming methods in LTE, LTE-Advanced, LTE-Advanced Pro, NR and later communication systems, but the unified terminology is used in the present invention. When applied to a specific system, It can be replaced with terms used in the corresponding system.

3GPP: 3rd Generation Partnership Project, the third generation partnership project

LTE: Long Term Evolution, long-term evolution technology

NR: New Radio, New Radio, New Radio

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, user equipment

eNB: evolved NodeB, evolved base station

gNB: 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, cell radio network temporary identifier

CSI: Channel State Indicator, channel state indicator

HARQ: Hybrid Automatic Repeat Request, hybrid automatic repeat request

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, configure scheduling permission

Sidelink: side-line communication

SCI: Sidelink Control Information, side-line communication control information

PSCCH: Physical Sidelink Control Channel, physical side link control channel

MCS: Modulation and Coding Scheme, modulation and coding scheme

CRB: Common Resource Block, common resource block

CP: Cyclic Prefix, cyclic prefix

PRB: Physical Resource Block, physical resource block

PSSCH: Physical Sidelink Shared Channel, physical sidelink shared channel

FDM: Frequency Division Multiplexing, Frequency Division Multiplexing

RRC: Radio Resource Control, radio resource control

RSRP: Reference Signal Receiving Power, reference signal received power

SRS: Sounding Reference Signal, sounding reference signal

DMRS: Demodulation Reference Signal, demodulation reference signal

CRC: Cyclic Redundancy Check, cyclic redundancy check

PSDCH: Physical Sidelink Discovery Channel, physical side link discovery channel

PSBCH: Physical Sidelink Broadcast Channel, physical side-line communication broadcast channel

SFI: Slot Format Indication, slot format indication

TDD: Time Division Duplexing, time division duplex

FDD: Frequency Division Duplexing, Frequency Division Duplexing

SIB1: System Information Block Type 1, System Information Block Type 1

SLSS: Sidelink synchronization Signal, side-line communication synchronization signal

PSSS: Primary Sidelink Synchronization Signal, the main synchronization signal of side-line communication

SSSS: Secondary Sidelink Synchronization Signal, side-line communication secondary synchronization signal

PCI: Physical Cell ID, physical cell ID

PSS: Primary Synchronization Signal, the primary synchronization signal

SSS: Secondary Synchronization Signal, secondary synchronization signal

BWP: BandWidth Part, bandwidth segment/part

GNSS: Global Navigation Satellite System, Global Navigation Satellite Positioning System

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

DFN: Direct Frame Number, direct frame number

IE: Information Element, information element

SSB: Synchronization Signal Block, synchronization system information block

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

MCG: Master Cell Group, primary 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 solution of the present invention. Unless otherwise specified, the same terms in the specific embodiments have the same meaning as in the prior art.

It is worth pointing out that V2X and sidelink mentioned in the specification of the present invention have the same meaning. V2X in the text can also mean sidelink; similarly, sidelink in the text can also mean V2X, and no specific distinction and limitation will be made in the following text.

The CG and resource pattern in the specification of the present invention can be replaced equally. That is, the CG involved in the specification can also represent the resource style, and the resource style involved can also represent the CG.

The resource allocation mode of V2X (sidelink) communication and the transmission mode of V2X (sidelink) communication in the specification of the present invention can be replaced equally. The resource allocation mode involved in the specification can represent a transmission mode, and the related transmission mode can represent a resource allocation mode.

In the specification of the present invention, floor() represents the round-down operation, and mod() represents the remainder operation.

The symbol "A->B" in the specification of the present invention indicates that the parameter (or IE) A includes the configuration of the parameter (or IE) B. Moreover, in the specification of the present invention, the parameters with the same identifier have the same meaning, and the form of the configuration information is the same.

In the specification of the present invention, a CG resource pool (CG pool) refers to one or more CGs configured by a base station or pre-configured by a user equipment (Pre-configuration).

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

In Rel-15 NR, on the basis of supporting DCI dynamic scheduling PUSCH, it also supports CG-based uplink scheduling method. In the specification of the present invention, CG stands for configured grant, that is, stands for configured scheduling permission. For NR type 1 configuration scheduling permission, the base station configures the CG for the UE through RRC signaling. In the NR type 1 configuration scheduling grant mechanism, the UE does not need to monitor the DCI dynamic scheduling including UL grant, and can use the CG configured by the base station to transmit the PUSCH. Specifically, the base station configures the parameters of PUSCH transmission through RRC signaling configuredGrantConfig, and the RRC signaling configuredGrantConfig includes rrc-ConfiguredUplinkGrant. The configured scheduling grant configuredGrantConfig includes at least the time domain resources, frequency domain resources, and resource periods of the semi-persistent scheduled PUSCH. Among them, rrc-ConfiguredUplinkGrant includes the scheduling of the above-mentioned time domain resources and frequency domain resources. In type 1 CG PUSCH transmission, the UE does not need to monitor the uplink scheduling grant (UL grant) in the DCI. After the base station is configured with type 1 CG (IE: configured GrantConfig), the UE can use the configured CG resources to transmit the PUSCH.

Rel-15 EN-DC overview

Rel-15 supports LTE-NR dual connection (Dual Connection, EN-DC for short). EN-DC means that for an NR UE, the UE performs initial access through an LTE cell and is also configured with an NR cell, so it is called dual connectivity. In the EN-DC scenario, one or more cells of the LTE base station eNB are called MCGs. The frequency where the MCG cell is located is called the serving frequency of the MCG (serving frequency). Among them, the MCG working at the primary frequency (Primary frequency) is called PCell. One or more cells of the NR base station gNB are called SCG. The frequency where the SCG cell is located is called the serving frequency of the SCG (serving frequency). In SCG, the cell where the UE performs RRC reconfiguration and random access is called PSCell, that is, Primary SCell.

NR parameter set (numerology)

The parameter set of NR includes two aspects: subcarrier spacing and CP length. Rel-15 NR supports a total of 5 sub-carrier intervals, which are 15kHz, 30kHz, 60kHz, 120kHz, 240kHz (corresponding to μ=0, 1, 2, 3, 4). Table 4.2-1 shows the parameter set supported by NR. The details are as follows.

Table 4.2-1.NR numerology

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

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

NR Common Resource Block (Common RB, CRB)

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

NR resource grid (resource grid)

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

Subcarriers (ie

Resource blocks RB, each resource block contains

Subcarrier), including in the time domain

OFDM symbols (

Indicates the number of OFDM symbols in a subframe, the specific value is related to μ), where

Refers to the number of subcarriers in a resource block RB, satisfying

The lowest numbered common resource block of the resource grid (common resource block,

Configured by the high-level parameter offsetToCarrier, the number of frequency domain resource blocks

Configured by the high-level parameter carrierBandwidth. Among them, for a given numerology and high-level parameter offsetToCarrier, the gNB configures a cell specific common offsetToCarrier in the ServingCellConfigCommon IE through dedicated signaling. Specifically, the ServingCellConfigCommon includes the high-level parameter downlinkConfigCommon, and the downstreamConfigCommon includes the configuration information of offsetToCarrier.

Bandwidth segment (BWP) and initial downlink bandwidth segment (initial DL BWP)

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

And length

The following relationships must be met at the same time:

That is, the CRB contained in the BWP must be located in the resource grid of the corresponding numerology.

The CRB number is used to indicate the distance from the lowest numbered CRB of the BWP to point A, in RB.

The resource block in the BWP is called the physical resource block (PRB), and its number is

Among them, physical resource block 0 corresponds to the CRB with the lowest number of the BWP, namely

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

1) Subcarrier spacing;

2) CP length;

3) The high-level parameter locationAndBandwidth indicates that the BWP is relative to the start of the resource grid

The offset value offset (RB _start ) and the number of consecutive CRBs in the BWP frequency domain L _RB satisfy

Among them, O _carrier represents offsetToCarrier; among them, the parameter locationAndBandwidth indicates a RIV (Resource Indication Value, resource indication value). The RIV calculation relationship between L _RB and RB _start is: if

Then

otherwise,

among them,

and,

4) The number of the BWP;

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

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

Sidelink communication scenario

1) No network coverage (Out-of-Coverage) side-line communication: Two UEs performing sidelink communication have no network coverage (for example, the UE cannot detect anything that meets the "cell selection criteria" on the frequency where sidelink communication is required. Cell, which means that the UE has no network coverage).

2) In-Coverage side-line communication: Both UEs performing sidelink communication have network coverage (for example, the UE detects at least one cell that meets the "cell selection criteria" on the frequency that needs sidelink communication, Indicates that the UE has network coverage).

3) Partial-Coverage (Partial-Coverage) side-line communication: One UE performing sidelink communication has no network coverage, and the other UE has network coverage.

From the UE side, the UE has only two scenarios without network coverage and with network coverage. Part of the network coverage is described from the perspective of sidelink communication.

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

Existing LTE V2X communication only supports broadcast communication at the physical layer. Broadcast communication is widely used in scenarios such as cellular communication where the base station sends system messages to UEs in the cell. NR V2X's design goals include supporting unicast communication and multicast communication at the physical layer. Unicast communication refers to communication between a sending user equipment (UE) and a single receiving user equipment. Multicast communication generally means that a group of UEs are assigned the same identity (Indentity, ID), the UE sends V2X data to other UEs in the group, and receives V2X data sent by other UEs in the group. It is worth pointing out that, in order to better improve the reliability of transmission and improve the spectrum efficiency, the HARQ retransmission mechanism is usually included in unicast communication and multicast communication. HARQ stands for hybrid automatic retransmission, which can provide error correction and realize fast retransmission, and is widely used in wireless data communications. HARQ feedback includes HARQ ACK and HARQ NACK. Among them, HARQ ACK means that the receiving UE correctly receives and decodes the data of the sending UE, so the HARQ ACK is fed back; HARQ NACK means that the receiving UE does not correctly receive and decode the data of the sending UE. When the receiving UE feeds back HARQ NACK, the sending UE may retransmit the corresponding data to ensure that the reliability of data communication is improved. In NR V2X, HARQ ACK and HARQ NACK are carried by the physical side communication feedback channel (PSFCH).

The basic process of LTE V2X (sidelink) communication

Fig. 1 is a schematic diagram showing LTE V2X UE side-line communication. First, UE1 sends sideline communication control information (SCI format 1) to UE2, which is carried by the physical layer channel PSCCH. SCI format 1 contains PSSCH scheduling information, such as PSSCH time domain and frequency domain resources, MCS, etc. Secondly, UE1 sends sideline communication data to UE2, which is carried by the physical layer channel PSSCH. The PSCCH and the corresponding PSSCH are frequency division multiplexed, that is, the PSCCH and the corresponding PSSCH are located on the same subframe in the time domain, and are located on different PRBs in the frequency domain. The specific design methods of PSCCH and 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 uses a predefined value 510. PSCCH can carry SCI format 1, where SCI format 1 contains at least PSSCH time-frequency domain resource information. For example, for the frequency domain resource indicator field, SCI format 1 indicates the starting sub-channel number and the number of consecutive sub-channels of the PSSCH corresponding to the PSCCH.

2) The PSSCH occupies a subframe in the time domain, and the corresponding PSCCH adopts frequency division multiplexing (FDM). PSSCH occupies one or more continuous sub-channels in the frequency domain. The sub-channel represents n _subCHsize consecutive PRBs in the frequency domain. The n _subCHsize is configured by the RRC parameter, and the number of sub-channels is determined by the frequency domain of SCI format 1. Resource indicator field indicator.

LTE V2X resource allocation method Transmission Mode 3/4 (when there is eNB network coverage)

Figure 2 shows the two resource allocation methods of LTE V2X when there is eNB network coverage on the frequency of sidelink communication, which are called resource allocation based on base station scheduling (Transmission Mode 3) and UE sensing (sensing). ) Resource allocation (Transmission Mode 4). In LTE V2X, when there is eNB network coverage, the base station can configure the UE's resource allocation mode through UE-level dedicated RRC signaling (dedicated RRC signaling) SL-V2X-ConfigDedicated, or called the UE's transmission mode ,Specifically:

1) Resource allocation mode based on base station scheduling (Transmission Mode 3): The resource allocation mode based on base station scheduling indicates that the time domain and frequency domain resources used for sidelink communication come from the scheduling of the base station. Specifically, when the RRC signaling SL-V2X-ConfigDedicated is set to scheduled-r14, it means that the UE is configured in a transmission mode based on base station scheduling. The base station configures SL-V-RNTI through RRC signaling, and sends the uplink scheduling permission UL grant to the UE through PDCCH (DCI format 5A, CRC is scrambled by SL-V-RNTI). The uplink scheduling grant UL grant includes at least the scheduling information of the PSSCH time domain and frequency domain resources in the sidelink communication. After the UE successfully monitors the PDCCH scrambled by SL-V-RNTI, the PSSCH time domain and frequency domain resource indicator fields in the UL grant of the uplink scheduling grant are used as the time domain and frequency domain resources of the PSSCH in the PSCCH (SCI format 1). Instruct information, and send PSCCH (SCI format 1) and the corresponding PSSCH.

2) Resource allocation method based on UE sensing (Transmission Mode 4): The resource allocation method based on UE sensing indicates that the resources used for sidelink communication are based on the UE's sensing process of the candidate available resource set. When the RRC signaling SL-V2X-ConfigDedicated is set to ue-Selected-r14, it means that the UE is configured in the transmission mode based on UE sensing. In the transmission mode based on UE sensing, the base station configures the available transmission resource pool, and the UE determines the PSSCH sidelink transmission resource in the transmission resource pool (resource pool) according to certain rules (see the LTE V2X UE sensing process section for detailed process description) , And send PSCCH (SCI format 1) and the corresponding PSSCH.

LTE V2X resource allocation mode Transmission Mode 4 (when there is no eNB network coverage)

When there is no eNB network coverage on the frequency for sidelink communication, LTE V2X only supports the resource allocation method based on UE sensing, that is, only the transmission mode Mode 4 is supported. The resource allocation method based on UE sensing means that the resources used for sidelink communication are based on the UE's sensing process of the set of candidate available resources. In the UE sensing-based transmission mode, the UE determines the PSSCH sidelink transmission resources in the pre-configuration (Pre-Configuration) transmission resource pool (resource pool) according to certain rules (for a detailed description of the process, refer to the LTE V2X UE sensing process section) , And send PSCCH (SCI format 1) and the corresponding PSSCH.

NR V2X resource allocation mode Mode 1 and Mode 2

NR V2X (sidelink) side-line communication includes at least two resource allocation methods, namely mode 1 resource allocation method based on base station scheduling and mode 2 UE determines the resource allocation method of sidelink communication resources. The specific definitions of Mode 1 and Mode 2 are:

1) Mode 1: The resources used by the base station for scheduling UE sidelink communication;

2) Mode 2: The UE determines the resources used for sidelink communication among the resources configured or pre-configured by the base station.

Among them, Mode 2 includes 4 sub-modes, which are respectively defined as mode 2 (a), (b), (c), (d). The specific definitions of the 4 sub-modes included in Mode 2 are:

1) Mode 2(a): UE selects the resources of sidelink communication by itself;

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

3) Mode 2(c): The base station configures the UE NR type 1 (NR type 1) configuration scheduling grant (configured grant, which can be referred to as CG for short);

4) Mode 2(d): The UE schedules resources for other UEs for sidelink communication.

Method for LTE V2X UE to determine PSSCH subframe resource pool (subframe resource pool)

In LTE V2X, the method for determining the subframe resource pool is based on all the subframes in the range of SFN#0-SFN#1023, a total of 10240 subframes. Here, the set of subframes that may belong to the PSSCH subframe resource pool sent by the V2X UE is expressed as

Satisfy:

1)

2) The subframes in the above subframe set are numbered relative to the subframe #0 of SFN#0 or DFN#0, namely

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

3) The aforementioned subframe set includes all subframes (subframes included in a, b, and c) after the following subframes are removed:

a) The number of subframes where SLSS is configured is expressed as N _SLSS ;

b) The number of downlink subframes and special subframes in the TDD cell is expressed as N _dssf ;

c) reserved (reserved) subframes, where the method for determining the reserved subframes is: after all subframes with subframe numbers 0-10239 are removed from N _SLSS and N _dssf subframes, the remaining (10240-N _SLSS -N _dssf ) sub-frames are arranged in ascending order of sub-frame number, which can be expressed as

r=floor(m·(10240-N _SLSS -N _dssf )/N _reserved ). Where m = 0, 1, ..., N _reserved -1, and N _reserved = (10240-N _SLSS- N _dssf ) mod L _bitmap . L _bitmap represents the _bitmap length of the resource pool configuration, which is configured by the upper layer, and the bitmap can be expressed as

The subframe numbered corresponding to the subframe l _r belongs to the reserved subframe.

4) The subframes in the subframe set are arranged in ascending order of subframe numbers.

The method for the UE to determine the PSSCH subframe resource pool is: for the subframe set

Subframe

If b _k′ =1, where k′=k mod L _bitmap , then the subframe

It belongs to the PSSCH subframe resource pool.

LTE V2X transmission mode 4 (Transmission Mode 4) reserved resources

In LTE V2X transmission mode 4, when the UE determines the resources for sending sidelink communication through the sensing process, the UE reserves resources for periodic service data. It is assumed that the subframe resource determined by the UE for transmitting PSSCH is expressed as a subframe

Then the UE is in the subframe

Reserve resources on. Where j = 1, 2, ..., C _resel -1, C _resel = 10×SL_RESOURCE_RESELECTION_COUNTER, and SL_RESOURCE_RESELECTION_COUNTER is configured by a higher layer. If the upper layer is not configured, C _resel =1. P _{rsvp_TX'} = P _step × P _{rsvp_TX} /100. LTE V2X includes periodic services, and the period of service generation is about P _serv =100ms. Among them, P _step represents the number of uplink subframes available in P _serv . The following table 14.1.1-1 shows the value of P _step in different TDD uplink and downlink configuration information in LTE V2X. For example, for TDD UL/DL configuration information 2, each system frame includes 2 uplink subframes. In the service period of P _serv =100ms, there are a total of 20 uplink subframes. Table 1 shows the determination of P _step for edge connection transmission modes 3 and 4, as shown in the following table.

Table 1

P _{rsvp_TX} represents the resource reservation interval indicated by the upper layer (resource reservation interval).

LTE V2X UE determines the resource reservation indication field in SCI

The resource reservation interval indicated by the upper layer is represented as P _{rsvp_TX} . The UE determines the value of X=P _{rsvp_TX} /100 according to the upper layer instruction, and combined with the following Table 2, the UE can determine the resource reservation indication field (4-bit indication field) in the SCI.

Form 2

LTE V2X transmission mode 4 (Transmission Mode 4) UE sensing (sensing) process Cheng

For the UE sensing process, generally speaking, in LTE V2X transmission mode 4, the upper layer requests (request) sidelink data to be sent in subframe #n, and the UE is in subframe

According to the successfully decoded SCI format 1, the UE determines the available resources in the candidate resource set between subframe #(n+T1) and subframe #(n+T2). Among them, if the subframe #n belongs to the subframe set

Then

otherwise,

Indicates that the first one after subframe #n belongs to the subframe set

Of subframes. T1 and T2 depend on the specific implementation of the UE.

Each element in the set of candidate resources between subframe #(n+T1) and subframe #(n+T2), that is, each candidate resource can be called a candidate single subframe resource, using R _{x , Y} to indicate. The specific definition of R _{x, y} is:

1) x represents L _subCH consecutive sub-channel#(x+j) in the frequency domain, where j=0, 1,..., L _subCH -1.

2) y represents the time domain subframe

The UE assumes that between subframe #(n+T1) and subframe #(n+T2), any consecutive L _subCH sub-channels belonging to the PSSCH resource pool correspond to one candidate single subframe resource. S _A set of candidate resources using FIG.

Remember UE in subframe

The resource reservation indication field in the received SCI format 1 is P _{rsvp_RX} . If the UE is in a subframe

Received SCI format 1 or in subframe

Received PSSCH resource blocks and subframe resources and candidate single subframe resources indicated in the same SCI format1

When overlap or partially overlap, the UE will frame the candidate list resource R _{x, y} is removed from the S _A (exclude). Among them, q=1, 2,..., Q, and j=1, 2,..., C _resel -1. If P _{rsvp_RX} <1 and n'-m≤P _step ×P _{rsvp_RX} , then Q=1/P _{rsvp_RX} ; otherwise, Q=1.

LTE V2X UE selects synchronization source

The synchronization source may be referred to as sync source for short, or sync reference for short. In LTE V2X, similar to the cellular network communication mechanism, if the UE needs to transmit data, the UE first needs to synchronize the time domain and frequency domain. In cellular network communication, after the UE receives the primary synchronization and secondary synchronization signals, the timing relationship (or called timing) of the cell can be determined. Specifically, taking time domain synchronization as an example, in LTE, the UE determines frame synchronization and subframe synchronization according to the received PSS and SSS; in NR, the UE according to the number of the synchronization system information block SSB and the predefined SSB mapping method Determine frame synchronization and subframe/slot synchronization. For V2X or sidelink communication, 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 the synchronization source. Possible synchronization sources include:

1) eNB;

2) GNSS;

3) LTE sidelink UE.

The UE determines the synchronization source (Synchronization Source) according to a certain pre-defined priority criterion. The priority criterion includes, but is not limited to: the priority of the base station eNB is higher than that of the sidelink UE, and the higher priority of the signal sent by the sidelink UE is higher RSRP. That is, when other conditions are the same, the UE prefers the base station eNB as the synchronization source compared to the sidelink UE. In the embodiment of the present invention, if the UE is involved in selecting the synchronization source, the UE will determine the synchronization source according to a certain priority criterion by default.

LTE sidelink discovery (Discovery) mode

In LTE sidelink, it supports sidelink UE sending and monitoring sidelink discovery messages (Discovery Message). The discovery message is carried in the physical side-line communication discovery channel PSDCH. The discovery mode in LTE sidelink is used for mutual discovery between neighboring UEs. Two discovery modes (Discovery Models) are defined in LTE sidelink.

1) Mode A: A discovery mode called "I am here". Mode A includes two types of UEs.

■Notifying UE (Announcing UE): The UE notifies the discovery message, and the neighboring UE can receive it and use the above discovery message for sidelink discovery;

■Monitoring UE: The neighboring UE that monitors the discovery message sent by the notification UE.

2) Mode B: A discovery mode called "Who is there?" or "Are you there?". Mode B includes two types of UEs.

■Discoverer UE: The UE sends discovery messages. The discovery message contains request information.

■ Discovered UE (Discoveree UE): The UE receives the request information and replies with information related to the request message.

In the following, the method executed by the user equipment UE in the present invention will be described. Specifically, as an example, FIG. 3 shows a flowchart of the method 10 executed by the user equipment UE based on an embodiment of the present disclosure.

As shown in FIG. 3, in step 11, the user equipment UE monitors the first sideline communication control information SCI sent by other user equipment UE.

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

In step 12, based on the first SCI, the used configuration scheduling permission CG is removed from the configuration scheduling permission CG resource pool.

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

In the case where the first SCI contains a CG sequence number and/or first reserved resource interval indication information, the UE removes from the CG resource pool the CG that overlaps the CG corresponding to the CG sequence number, And/or, removing from the CG resource pool a CG that overlaps with the time-frequency resource indicated by the first reserved resource interval indication information. In addition, the second SCI may include: the sequence number of the CG selected by the UE, and/or a second reserved resource interval indication corresponding to the UE.

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

Furthermore, in the 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 is removed from the CG resource pool A CG that overlaps with the time-frequency resource indicated by the first time-frequency resource period or interval indication information, and/or removes the second time-frequency resource period or interval indication information from the CG resource pool CGs where the indicated time-frequency resources overlap. In addition, the second SCI may include: an indication of the period or interval of the reserved resource corresponding to the UE, and/or an indication of the period or interval of the CG selected by the UE.

In addition, in the case where the first SCI includes an indication of a reserved resource period or interval, and/or an indication of a CG period, the UE removes a period value from the CG resource pool that is greater than the value corresponding to the user equipment The CG of the reserved resource period or interval. And the second SCI may include the period of the CG selected by the UE, and/or the time-frequency resource of the selected CG, and/or the period or interval of the reserved resource corresponding to the UE.

Hereinafter, specific examples and embodiments related to the present invention will be described in detail. In addition, as described above, the examples and embodiments described in this disclosure are illustrative descriptions for easy understanding of the present invention, and do not limit the present invention.

[Example 1]

FIG. 4 is a schematic diagram showing the basic process of the method executed by the user equipment in the first embodiment of the present invention.

In the following, the method executed by the user equipment in the first embodiment of the present invention will be described in detail with reference to the basic process diagram shown in FIG. 4.

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

In step S101, the user equipment monitors the first sideline communication control information SCI sent by other user equipment. The first SCI includes a sequence number (index) of the Configured Grant (CG).

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

Optionally, the condition for the user equipment to remove the CG from the CG resource pool includes but is not limited to the following condition: overlap with the CG corresponding to the CG sequence number included in the first SCI. That is to say, 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 sends the second SCI. The second SCI includes the serial number of the CG selected by the user equipment.

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

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

[Example 2]

Fig. 5 is a schematic diagram showing the basic process of the method executed by the user equipment in the second embodiment of the present invention.

In the following, the method executed by the user equipment according to the second embodiment of the present invention will be described in detail with reference to the basic process diagram shown in FIG. 5.

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

In step S201, the user equipment monitors the first sideline communication control information SCI sent by other user equipment. The first SCI includes a sequence number (index) of the Configured Grant (CG) and/or reserved resource interval indication information.

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

Optionally, the conditions for the user equipment to remove the CG from the CG resource pool include but are not limited to the following conditions: overlap with the CG corresponding to the CG sequence number included in the first SCI, and overlap with the first The time-frequency resources indicated by the reserved resource interval indication information included in the SCI overlap. That is to say, 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 sends the second SCI. The second SCI includes the sequence number of the CG selected by the user equipment, and/or an indication corresponding to the reserved resource interval of the user equipment.

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

Optionally, in step S202 in the second embodiment of the present invention, another possible implementation manner is if a certain CG in the CG resource pool overlaps with the CG corresponding to the CG sequence number contained in the first SCI, And/or, if a certain CG in the CG resource pool overlaps with the time-frequency resource indicated by the reserved resource interval indication information included in the first SCI, the user equipment determines that the CG is used (used)CG. Overlapping means that the time domain and frequency domain resources partially overlap or completely overlap. The user equipment selects an unused CG from the CG resource pool. Optionally, 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 CG corresponding to the CG sequence number included in the first SCI, and overlap with the first SCI The time-frequency resources indicated by the reserved resource interval indication information included in the reserved resource interval overlap. That is to say, the condition for the user equipment to determine that the CG is a used CG may also include other conditions (while satisfying other conditions).

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

[Example Three]

FIG. 6 is a schematic diagram showing the basic process of the method executed by the user equipment in the third embodiment of the present invention.

In the following, the method executed by the user equipment in the third embodiment of the present invention will be described in detail with reference to the basic process diagram shown in FIG. 6.

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

In step S301, the user equipment monitors the first sideline communication control information SCI sent by other user equipment. The first SCI includes reserved resource interval indication information.

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

Optionally, the condition for the user equipment to remove the CG from the CG resource pool includes but is not limited to the following condition: overlapping with the time-frequency resource indicated by the reserved resource interval indication information included in the first SCI. That is to say, 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 S303, the user equipment sends the second SCI. The second SCI includes an indication corresponding to the reserved resource interval of the user equipment.

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

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

[Example Four]

FIG. 7 is a schematic diagram showing the basic process of the method executed by the user equipment in the fourth embodiment of the present invention.

In the following, the method executed by the user equipment according to the fourth embodiment of the present invention will be described in detail with reference to the basic process diagram shown in FIG. 7.

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

In step S401, the user equipment monitors the first sideline communication control information SCI sent by other user equipment. The first SCI includes an indication of a time-frequency resource, and/or period or interval indication information of the time-frequency resource.

Optionally, the time-frequency resources may be reserved resources or CG resources.

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

Optionally, the conditions for the user equipment to remove the CG from the CG resource pool include but are not limited to the following conditions: overlap with the time-frequency resource indicated by the time-frequency resource period or interval indication information included in the first SCI . That is to say, 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 S403, the user equipment sends the second SCI. The second SCI includes an indication of a time-frequency resource, and/or an indication of the period or interval of the time-frequency resource.

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

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

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

[Example 5]

FIG. 8 is a schematic diagram showing the basic process of the method executed by the user equipment in the fifth embodiment of the present invention.

In the following, the method executed by the user equipment according to the fifth embodiment of the present invention will be described in detail with reference to the basic process diagram shown in FIG. 8.

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

In step S501, the user equipment monitors the first sideline communication control information SCI sent by other user equipment. The first SCI includes period or interval indication information of the first time-frequency resource, and/or period or interval (interval) indication information of the second time-frequency resource.

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

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

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

Optionally, the conditions for the user equipment to remove the CG from the CG resource pool include but are not limited to the following conditions: the same as the time-frequency resource indicated by the first time-frequency resource period or interval indication information included in the first SCI Overlap, overlap with the time-frequency resource indicated by the second time-frequency resource period or interval indication information included in the first SCI. That is to say, 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 sends the second SCI. The second SCI includes an indication corresponding to the period or interval of the reserved resource of the user equipment, and/or an indication of the period or interval of the CG selected by the user equipment.

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

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

[Example 6]

In the sixth embodiment of the present invention, the steps performed by the user equipment include:

In step S601, the user equipment monitors the first sideline communication control information SCI sent by other user equipment. The first SCI includes reserved resource period (period) or interval (interval) indication information, and/or an indication of the CG period.

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

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

[Example 7]

In the seventh embodiment of the present invention, the steps performed by the user equipment include:

In step S701, the user equipment monitors the first sideline communication control information SCI sent by other user equipment. The first SCI includes reserved resource period (period) or interval (interval) indication information, and/or an indication of the CG period.

In step S702, the user equipment removes (exclude) from the CG resource pool (CG pool) the CG whose period value is greater than the reserved resource period or interval corresponding to the user equipment.

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

Optionally, when the user equipment selects an unused CG, it is assumed that the priority of the CG whose period value is greater than the reserved resource period or interval corresponding to the user equipment is lower than the period value is less than or equal to that of the corresponding user equipment. The priority of the CG that reserves the resource period or interval.

Optionally, the user equipment preferentially selects a CG whose period value is equal to the reserved resource period or interval corresponding to the user equipment.

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

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

[Example 8]

In the eighth embodiment of the present invention, the steps performed by the user equipment include:

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

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

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

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

Optionally, the serving frequency of LTE includes the carrier frequency of the PCell and/or SCell.

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

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

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

Optionally, the serving frequency of NR includes the carrier frequency of PSCell and/or SCell.

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

In step S804, if the frequency at which the user equipment performs sidelink communication 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, then the user equipment preferentially selects the eNB as the synchronization The source, or the gNB is preferentially selected as the synchronization source, or the user equipment assumes that the priority of the eNB and the gNB are the same.

Optionally, a complete alternative implementation manner of Embodiment 8 of the present invention is that if the NR sidelink UE is configured with NR SCG (IE: nr-SecondaryCellGroupConfig, or can be described as in EN-DC), if the The sidelink UE selects the eNB as the synchronization source, and if the frequency at which the sidelink UE performs sidelink communication belongs to (concern) or is equal to the primary frequency, then the user equipment selects the PCell as the synchronization reference cell (sync reference cell). Optionally, if the sidelink UE selects the eNB as the synchronization source and if the frequency of the sidelink communication belongs to (concern) or is equal to the secondary frequency, then the user equipment selects the corresponding (concerned) secondary cell SCell as the synchronization reference Cell (sync reference cell). If the sidelink UE selects gNB as the synchronization source and if the frequency of sidelink communication by the sidelink UE belongs to (concern) or is equal to the serving frequency of the PSCell, then the user equipment selects the PSCell as the synchronization reference cell (sync reference cell) . Optionally, if the sidelink UE selects gNB as the synchronization source and if the frequency of sidelink communication belongs to (concern), or is equal to the serving frequency of SCell, then the user equipment selects the corresponding (concerned) secondary cell SCell as Sync reference cell (sync reference cell).

Optionally, another complete alternative implementation manner of the eighth embodiment of the present invention is that if the sidelink UE is configured with NR SCG (IE: nr-SecondaryCellGroupConfig, or can be described as in EN-DC), the base station passes RRC Signaling configuration, or the user equipment is pre-configured, or pre-defined (pre-defined), the user equipment selects eNB as the synchronization source, or the user equipment selects gNB as the synchronization source.

[Example 9]

In the ninth embodiment of the present invention, the steps performed by the user equipment include:

In step S901, the user equipment receives the 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 user equipment determines whether to feed back HARQ ACK according to pre-configuration information, or the user equipment is pre-configured with information about whether to feed back HARQ ACK.

Optionally, the user equipment is pre-configured with the PSFCH resource information fed back by HARQ.

Optionally, the specific implementation of the indication of whether to feed back HARQ ACK and pre-configured information of whether to feed back HARQ ACK includes but is not limited to:

1) Configure via RRC signaling, or, the information element in the pre-configuration information; or,

2) The PSFCH resource of HARQ ACK is configured or pre-configured separately (additional or separate); optionally, the base station may separately configure or the user equipment separately pre-configured the PSFCH resource of HARQ NACK.

In step S902, the user equipment determines the HARQ feedback resource according to the indication of whether to feed back HARQ ACK and/or the PSFCH resource information of the HARQ feedback, and performs HARQ feedback. If the base station is configured or the user equipment is pre-configured to feed back HARQ ACK, or the user equipment is sent to indicate the HARQ ACK feedback, 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 manner is that the user equipment receives and sends the instruction information of the user equipment. The indication information includes an indication whether to feed back HARQ ACK, and/or PSFCH resource indication information for HARQ feedback. Wherein, the specific implementation of the indication information of whether to feed back HARQ ACK includes but is not limited to:

1) Indication by PSCCH or SCI, possible implementations include indication field indication in SCI, or PSCCH CRC scrambling indication; or,

2) By indicating the PSFCH resource of HARQ ACK separately (additional or separate), it means that the user equipment needs to feed back HARQ ACK; or,

3) Indicated by a discovery message (Discovery Message), the discovery message can be carried in the PSDCH, or in the PSSCH, or in the PSCCH, or in the PSBCH. or,

4) In the process of connection setup (connection setup or establishment), the sending user equipment indicates or coordinates (coordinate or negotiate) whether to feed back HARQ ACK through high-level signaling (RRC signaling or AS signaling).

[Example 10]

In the tenth embodiment of the present invention, the steps performed by the user equipment include:

In step S1001, the user equipment receives the 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 user equipment determines whether to feed back HARQ ACK according to pre-configuration information, or the user equipment is pre-configured with information about whether to feed back HARQ ACK.

Optionally, the user equipment is pre-configured with the PSFCH resource information fed back by HARQ.

Optionally, the specific implementation of the indication of whether to feed back HARQ ACK and pre-configured information of whether to feed back HARQ ACK includes but is not limited to:

1) Configure via RRC signaling, or, the information element in the pre-configuration information; or,

2) The PSFCH resource of HARQ ACK is configured or pre-configured separately (additional or separate); optionally, the base station may separately configure or the user equipment separately pre-configured the PSFCH resource of HARQ NACK.

In step S1002, the user equipment receives and sends the instruction information of the user equipment. The indication information includes an indication whether to feed back HARQ ACK, and/or PSFCH resource indication information for HARQ feedback. Wherein, the specific implementation of the indication information of whether to feed back HARQ ACK includes but is not limited to:

1) Indication by PSCCH or SCI, possible implementations include indication field indication in SCI, or PSCCH CRC scrambling indication; or,

2) By indicating the PSFCH resource of HARQ ACK separately (additional or separate), it means that the user equipment needs to feed back HARQ ACK; or,

3) Indicated by a discovery message (Discovery Message), the discovery message can be carried in the PSDCH, or in the PSSCH, or in the PSCCH, or in the PSBCH. or,

4) In the process of connection setup (connection setup or establishment), the sending user equipment indicates or coordinates (coordinate or negotiate) whether to feed back HARQ ACK through high-level signaling (RRC signaling or AS signaling).

In step S1003, if the base station configures or preconfigures the user equipment to feed back HARQ ACK, and sends the user equipment to instruct the user equipment to feed back HARQ ACK, then the user equipment performs HARQ ACK feedback and HARQ NACK feedback. Otherwise, the user equipment performs HARQ NACK feedback.

[Example 11]

In the eleventh embodiment of the present invention, the steps performed by the user equipment include:

In step S1101, for example, configuration information related to the initial BWP sent by the gNB is received. For example, receiving the initial resource block of the carrier where the initial BWP is sent by the gNB, and the offset of the initial BWP relative to the initial resource block of the carrier.

Optionally, the configuration information related to the initial BWP may be all UE-specific configuration information, or all cell-specific configuration information, or partly UE-specific configuration information and partly cell-specific configuration information.

Optionally, the initial resource block can be configured through the parameter offsetToCarrier in the SCS-SpecificCarrier IE; other configuration information of the carrier where the initial BWP is located can also be configured through the parameters in the SCS-SpecificCarrier IE, for example The subcarrier spacing of the carrier where the initial BWP is located is configured by the parameter subcarrierSpacing in the SCS-SpecificCarrier IE.

Optionally, if the initial BWP is an initial downlink BWP, the SCS-SpecificCarrier IE may be included in the parameter downlinkChannelBW-PerSCS-List in the ServingCellConfig IE.

Optionally, if the initial BWP is the initial uplink BWP, the SCS-SpecificCarrier IE may be included in the uplinkChannelBW-PerSCS-List in the parameter uplinkConfig in the ServingCellConfig IE.

Optionally, the offset of the initial BWP relative to the starting resource block of the carrier may be configured through the parameter locationAndBandwidth, or through the parameter location, or through other names. Optionally, the parameter locationAndBandwidth may represent a resource indication value (RIV), and the RIV corresponds to a resource block offset RB _start and a length L _RB . The resource block offset RB _{start is} used to indicate the offset of the initial BWP relative to the start resource block of the carrier. Optionally, the parameter location may represent a resource block offset RB _start . The parameter may be in ServingCellConfig IE, ServingCellConfig->the parameter,

Or, in the IE (for example, BWP) corresponding to the parameter in the ServingCellConfig IE (for example, initialDownlinkBWP), the specific configuration method is ServingCellConfig->initialDownlinkBWP->the parameter,

Or, in the IE (for example, BWP-DownlinkCommon) corresponding to the parameters in the ServingCellConfig IE (for example, initialDownlinkBWP), the specific configuration method is ServingCellConfig->initialDownlinkBWP->genericParameters->the parameters,

Or, in the IE (for example, BWP) corresponding to the parameter (for example, bwp) in the ServingCellConfig IE, the specific configuration method is ServingCellConfig->bwp->the parameter,

Or, in the IE (for example, BWP) corresponding to the parameters (for example, genericParameters) in the ServingCellConfig IE, the specific configuration method is ServingCellConfig->genericParameters->the parameters,

Or, in the IE (for example, BWP-DownlinkCommon) corresponding to the parameters in the ServingCellConfig IE (for example, bwp-DownlinkCommon), the specific configuration method is ServingCellConfig->bwp-DownlinkCommon->genericParameters->the parameters,

Or, in the IE (for example, DownlinkConfigCommon) corresponding to the parameter (for example, downlinkConfigCommon) in the ServingCellConfig IE, the specific configuration method is ServingCellConfig->downlinkConfigCommon->initialDownlinkBWP->genericParameters->the parameter.

In step S1102, the initial 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 (indicated by the common resource block number), and the offset of the initial BWP relative to the initial resource block of the carrier is RB _start , then The starting resource block of the initial BWP (indicated by the common resource block number) is

Optionally, in the 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 related 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, a microcontroller, an embedded processor, and the like. The memory 802 may include, for example, volatile memory (such as random access memory RAM), hard disk drive (HDD), non-volatile memory (such as flash memory), or other memories. The memory 802 stores program instructions. When the instruction is executed by the processor 801, it can execute the above-mentioned method executed by the user equipment described in detail in the present invention.

The method and related equipment of the present invention have been described above in conjunction with preferred embodiments. Those skilled in the art can understand that the methods shown above are only exemplary, and 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 and sequence shown above. The network node and user equipment shown above may include more modules, for example, may also include modules that can be developed or developed in the future and can be used for base stations, MMEs, or UEs, and so on. The various identifiers shown above are only exemplary rather than restrictive, and the present invention is not limited to specific information elements as examples of these identifiers. Those skilled in the art can make many changes and modifications based on the teaching of the illustrated embodiment.

It should be understood that the foregoing embodiments of the present invention can be implemented by software, hardware, or a combination of both software and hardware. For example, the various components inside the base station and user equipment in the above embodiment can be implemented by a variety of devices, including but not limited to: analog circuit devices, digital circuit devices, digital signal processing (DSP) circuits, programmable processing Device, application specific integrated circuit (ASIC), field programmable gate array (FPGA), programmable logic device (CPLD), etc.

In this application, "base station" may refer to a mobile communication data and control switching center with larger transmission power and wider coverage area, including functions such as resource allocation and scheduling, data reception and transmission. "User equipment" may refer to a user's mobile terminal, for example, including mobile phones, notebooks, and other terminal devices that can communicate with base stations or micro base stations wirelessly.

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 that has a computer-readable medium on which computer program logic is encoded, and when executed on a computing device, the computer program logic provides related operations to implement The above technical scheme of the present invention. When executed on at least one processor of the 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 (such as CD-ROM), a floppy disk or a hard disk, or as one or more Firmware or microcode on a ROM or RAM or PROM chip, or downloadable software images, shared databases, etc. in one or more modules. Software or firmware or such a configuration may 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 device and the terminal device used in each of the foregoing embodiments may be implemented or executed by a circuit, and the circuit is usually one or more integrated circuits. Circuits designed to perform the functions described in this specification can include general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC) or general-purpose integrated circuits, field programmable gate arrays (FPGA), or other Programming logic devices, discrete gates or transistor logic, or discrete hardware components, or any combination of the above devices. The general-purpose processor may be a microprocessor, or the processor may be an existing processor, controller, microcontroller, or state machine. The general-purpose processor or each circuit described above may be configured by a digital circuit, or may be configured by a logic circuit. In addition, when advanced technologies that can replace current integrated circuits appear due to advances in semiconductor technology, the present invention can also use integrated circuits obtained by using this advanced technology.

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

Claims (10)

1. A method executed by user equipment UE includes:

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

   Based on the first SCI, remove the used configuration scheduling permission CG from the configuration scheduling permission CG resource pool; 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: CG sequence number, and/or first reserved resource interval indication information,

   The UE removes from the CG resource pool the CG that overlaps with the CG corresponding to the CG sequence number, and/or removes the CG from the CG resource pool that corresponds to the first reserved resource interval indication information. CGs where the indicated time-frequency resources overlap.
3. The method of claim 2, wherein:

   The second SCI includes: the sequence number of the CG selected by the UE, and/or the second reserved resource interval indication corresponding to the UE.
4. The method of claim 1, wherein:

   The first SCI includes: time-frequency resource indication information, and the time-frequency resource period or interval indication information,

   The UE removes from the CG resource pool the CG that overlaps the time-frequency resource indicated by the time-frequency resource period or interval indication information.
5. The method of claim 4, wherein:

   The second SCI includes: an indication corresponding to the time-frequency resource of the UE, and/or an indication corresponding to the time-frequency resource period or interval of 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,

   The UE removes from the CG resource pool the CG that overlaps the time-frequency resource indicated by the first time-frequency resource period or interval indication information, and/or removes the CG from the CG resource pool and CGs with overlapping time-frequency resources indicated by the second time-frequency resource period or interval indication information.
7. The method according to claim 6, wherein:

   The second SCI includes: an indication corresponding to the period or interval of the reserved resource of the UE, and/or an indication of the period or interval of the CG selected by the UE.
8. The method of claim 1, wherein:

   The first SCI includes an indication of a reserved resource period or interval, and/or an indication of a CG period,

   Removing, by the UE, from the CG resource pool, a CG whose period value is greater than the reserved resource period or interval corresponding to the user equipment,

   The second SCI includes the period of the CG selected by the UE, and/or the time-frequency resource of the selected CG, and/or the period or interval of the reserved resource corresponding to the UE.
9. The method according to claim 7 or 8, wherein:

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

   The period or interval of the reserved resource corresponding to the UE is indicated by an upper layer.
10. A user equipment UE includes:

    Processor; and

    Memory, storing instructions;

    Wherein, the instruction executes the method according to any one of claims 1 to 9 when run by the processor.

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