CN114258147A

CN114258147A - Method performed by user equipment and user equipment

Info

Publication number: CN114258147A
Application number: CN202011012421.8A
Authority: CN
Inventors: 赵毅男; 罗超; 刘仁茂
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2020-09-23
Filing date: 2020-09-23
Publication date: 2022-03-29
Also published as: WO2022063070A1

Abstract

The invention provides a method executed by user equipment and the user equipment, wherein the method comprises the following steps: receiving first configuration information and/or second configuration information of sideline communication sent by a base station; and monitoring and receiving Downlink Control Information (DCI) format 3_ 0.

Description

Method performed by user equipment and user equipment

Technical Field

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

Background

In a conventional cellular network, all communications must pass through the base station. In contrast, D2D communication (Device-to-Device communication, direct Device-to-Device communication) refers to a communication method in which two user devices communicate directly without forwarding through a base station or a core network. The research topic on the realization of the D2D-adjacent communication service by LTE devices was approved at RAN #63 of 3rd Generation Partnership Project (3 GPP) in 2014 (see non-patent document 1). Functions introduced by LTE Release 12D 2D include:

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

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

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

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

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

2) priority handling mechanism for D2D communications.

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

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

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

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

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

The 3GPP has divided the research and standardization work of V2X into 3 stages. The first phase was completed in 2016 and 9 months, mainly focusing on V2V, and was formulated based on LTE Release 12 and Release 13D 2D (also called sidelink communication), i.e., proximity communication technology (see non-patent document 3). V2X stage 1 introduced a new D2D communication interface, called PC5 interface. The PC5 interface is mainly used to solve cellular internet of vehicles communication problems in high speed (up to 250 km/h) and high node density environments. The vehicles can interact with information such as position, speed and direction through the PC5 interface, i.e., the vehicles can communicate directly with each other through the PC5 interface. Compared with the proximity communication between D2D devices, the functions introduced by LTE Release 14V 2X mainly include:

1) higher density DMRS to support high speed scenarios;

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

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

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

At the 3GPP RAN #80 congress of 6 months in 2018, the corresponding third stage was approved based on the V2X feasibility study topic of 5G NR network technology (see non-patent document 5).

In conference 3GPP RAN1 AH #1901 in month 1 of 2019 (see non-patent document 6), the following conference conclusion is reached regarding transmission mode 1 in NR sidelink:

when the NR base station gNB schedules the NR side row communication transmission mode 1, a Type 1 configured scheduling grant (Type 1 configured grant) and a Type 2 configured scheduling grant (Type 2 configured grant) are supported.

At the 3GPP RAN1#96bis conference of 4 months in 2019 (see non-patent document 7), the following conference conclusion is reached regarding the configuration scheduling grant in the NR side-line communication:

a type 1 or type 2 configuration scheduling grant in a sidestream communication represents a set (set) of periodic resources for one or more NR side sidestream transmissions.

The scheme of the invention comprises a method for determining the value of an indication domain in corresponding downlink control information by user equipment when a base station schedules retransmission of a configuration scheduling permission of type 1 or type 2 in NR side-row communication.

Documents of the prior art

Non-patent document

Non-patent document 1: RP-140518, Work item deployment 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 propofol: 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 AH #1901, Charrman notes, section 7.2.4.1.4

Non-patent document 7: RAN1#96bis, Chairman nodes, section 7.2.4.2.1

Disclosure of Invention

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

A method performed by a user equipment according to the first aspect of the invention comprises: receiving first configuration information and/or second configuration information of sideline communication sent by a base station; and monitoring and receiving Downlink Control Information (DCI) format 3_ 0.

According to the method performed by the user equipment of the first aspect of the present invention, the first configuration information includes configuration information of a monitoring downlink control information, DCI, format; and/or the second configuration information at least comprises configuration information sl-CS-RNTI of a radio network temporary identifier of the sidestream communication configuration scheduling permission.

According to the method performed by the user equipment in the first aspect of the present invention, the first configuration information and/or the second configuration information configure the user equipment to monitor a downlink control information DCI format 3_0 in which a CRC check code is scrambled by the sl-CS-RNTI.

According to the method performed by the user equipment of the first aspect of the present invention, the DCI format 3_0 includes a new data indication field; and/or an indication field containing a configuration index in the DCI format 3_ 0.

According to the method performed by the user equipment of the first aspect of the present invention, in a case where a CRC check code of the DCI format 3_0 is scrambled by the sl-CS-RNTI and the DCI format 3_0 indicates retransmission of a configuration scheduling grant or the DCI format 3_0 indicates retransmission, an indication field of the configuration index is reserved or ignored.

According to the method performed by the user equipment of the first aspect of the present invention, in a case where the CRC check code of the DCI format 3_0 is scrambled by the sl-CS-RNTI and the user equipment considers that the DCI format 3_0 indicates or schedules a dynamic sidelink communications scheduling grant, or in a case where the CRC check code of the DCI format 3_0 is scrambled by the sl-CS-RNTI and the DCI format 3_0 indicates or schedules a dynamic sidelink communications scheduling grant, the indication field of the configuration index is reserved or ignored.

According to the method performed by the user equipment of the first aspect of the present invention, in a case where the CRC check code of the DCI format 3_0 is scrambled by the sl-CS-RNTI and the DCI format 3_0 is not used for activating or deactivating or releasing a sidelink communication configuration scheduling grant, the indication field of the configuration index is reserved or ignored.

According to the method performed by the user equipment of the first aspect of the present invention, the DCI format 3_0 includes an indication field of a HARQ process number.

According to the method performed by the user equipment in the first aspect of the present invention, in a case where the CRC check code of the DCI format 3_0 is scrambled by the sl-CS-RNTI, and the DCI format 3_0 indicates retransmission of a configuration scheduling grant or the DCI format 3_0 indicates retransmission, or in a case where the DCI format 3_0 indicates or schedules one dynamic sidelink communication scheduling grant, or in a case where the DCI format 3_0 is not used for activating or deactivating or releasing a sidelink communication configuration scheduling grant, the DCI format 3_0 schedules retransmission of the indication field of the configuration index and/or the sidelink communication configuration scheduling grant corresponding to the HARQ process number.

The user equipment according to the second aspect of the present invention comprises: a processor; and a memory storing instructions; wherein the instructions, when executed by the processor, perform the method of the first aspect.

The invention has the technical effects that:

according to the user equipment and the method executed by the user equipment, the user equipment can effectively determine the value of the indication domain in the corresponding downlink control information when the base station schedules the retransmission of the configuration scheduling permission of the type 1 or the type 2 in the NR side-line communication; furthermore, the indication field reserved in the downlink control information can be used for indication of other characteristics in future evolved NR side-line communication, i.e., forward compatibility is guaranteed.

Drawings

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

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

Fig. 2 is a diagram illustrating a resource allocation scheme of LTE V2X.

Fig. 3 is a schematic diagram showing a basic procedure of a method executed by a user equipment in the first embodiment, the second embodiment, the third embodiment and the fourth embodiment of the present invention.

Fig. 4 is a block diagram illustrating a user equipment according to an embodiment of the present invention.

Detailed Description

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

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

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

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

LTE: long Term Evolution, Long Term Evolution technology

NR: new Radio, New Wireless, New air interface

PDCCH: physical Downlink Control Channel, Physical Downlink Control Channel

DCI: downlink Control Information, Downlink Control Information

PDSCH: physical Downlink Shared Channel (pdcch)

UE: user Equipment, User Equipment

eNB: evolved NodeB, evolved node B

And g NB: NR base station

TTI: transmission Time Interval, Transmission Time Interval

OFDM: orthogonal frequency Division Multiplexing, orthogonal frequency Division Multiplexing

CP-OFDM: cyclic Prefix Orthogonal Frequency Division Multiplexing with Cyclic Prefix

C-RNTI: cell Radio Network Temporary Identifier

CSI: channel State Information, Channel State Information

HARQ: hybrid Automatic Repeat Request (HARQ)

CSI-RS: channel State Information Reference Signal (CSI-RS)

CRS: cell Reference Signal, Cell specific Reference Signal

PUCCH: physical Uplink Control Channel, Physical Uplink Control Channel

PUSCH: physical Uplink Shared Channel, Physical Uplink Shared Channel

UL-SCH: uplink Shared Channel, Uplink Shared Channel

CG: configured Grant, configuring scheduling Grant

Sidelink: sidelink communications

SCI: sidelink Control Information, Sidelink communication Control Information

PSCCH: physical Sidelink Control Channel, Physical Sidelink communication Control Channel

MCS: modulation and Coding Scheme, Modulation and Coding Scheme

RB: resource Block, Resource Block

RE: resource element, Resource element

CRB: common Resource Block, Common Resource Block

And (3) CP: cyclic Prefix, Cyclic Prefix

PRB: physical Resource Block, Physical Resource Block

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

FDM: frequency Division Multiplexing, Frequency Division Multiplexing

RRC: radio Resource Control, Radio Resource Control

RSRP: reference Signal Receiving Power, Reference Signal Receiving Power

SRS: sounding Reference Signal

DMRS: demodulation Reference Signal

CRC: cyclic Redundancy Check (crc)

PSDCH: physical Sidelink Discovery Channel

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

SFI: slot Format Indication

TDD: time Division Duplexing

FDD: frequency Division Duplexing

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

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

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

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

PCI: physical Cell ID, Physical Cell identity

PSS: primary Synchronization Signal, Primary Synchronization Signal

SSS: secondary Synchronization Signal, Secondary Synchronization Signal

BWP: bandwidth Part, BandWidth fragment/portion

GNSS: global Navigation Satellite positioning System (GNSS)

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

DFN: direct Frame Number, Direct Frame Number

IE: information element

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

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

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

SCG: secondary Cell Group, Secondary Cell Group

PCell: primary Cell, Primary Cell

SCell: secondary Cell, Secondary Cell

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

SPS: semi-persistent Scheduling, Semi-persistent Scheduling

TA: timing Advance, uplink Timing Advance

PT-RS: Phase-Tracking Reference Signals

TB: transport Block

CB: code Block, Code Block/Code Block

QPSK: quadrature Phase Shift Keying (QPSK)

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

AGC: auto Gain Control, automatic Gain Control

Tdra (field): time Domain Resource Assignment, Time Domain Resource allocation indication (Domain)

Fdra (field): frequency Domain Resource Assignment, Frequency Domain Resource allocation indication (Domain)

ARFCN: absolute Radio Frequency Channel Number, Absolute Radio Frequency Channel Number

SC-FDMA: single Carrier-Frequency Division Multiple Access, Single Carrier-Frequency Division Multiple Access

MAC: medium Access Control, media Access Control layer

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

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

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

In the description of the present invention, the resource allocation method of V2X (sidelink) communication and the transmission mode of V2X (sidelink) communication may be replaced by equivalent methods. The resource allocation pattern referred to in the specification may indicate a transmission mode, and the transmission mode referred to may indicate a resource allocation pattern. In NR side-row communication, transmission mode 1 indicates a transmission mode (resource allocation scheme) based on base station scheduling; transmission mode 2 denotes a transmission mode (resource allocation manner) based on user equipment awareness (sensing) and resource selection.

In the description of the present invention, both the configuration scheduling grant of type 1 and the configuration scheduling grant of type 1 in sidestream communication indicate that the configuration scheduling grant does not require activation (activation) or deactivation (de-activation, or release, release) of the DCI, and after the configuration scheduling grant of type 1 is configured, the MAC entity (MAC entry) of the UE stores the configuration scheduling grant for sidestream communication transmission.

Scenarios for Sidelink communications

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

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

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

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

Basic procedure for LTE V2X (sidelink) communication

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

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

2) The PSCCH occupies one subframe in the time domain, and the corresponding PSCCH employs Frequency Division Multiplexing (FDM). The PSSCH occupies one or more continuous sub-channels in the frequency domain, and the sub-channels represent n in the frequency domain_subCHsizeA plurality of RB, n in succession_subCHsizeConfigured by RRC parameters, the number of starting sub-channels and consecutive sub-channels is indicated by the frequency domain resource indication field of SCI format 1.

LTE V2X resource allocation Mode Transmission 3/4

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

1) resource allocation scheme based on base station scheduling (Transmission Mode 3): the resource allocation method based on base station scheduling represents that the frequency domain resources used by sidelink communication are scheduled by the base station. The transmission mode 3 includes two scheduling modes, namely dynamic scheduling and semi-persistent scheduling (SPS). For dynamic scheduling, the UL grant (DCI format 5A) includes frequency domain resources of the pscch, and the CRC of the PDCCH or EPDCCH carrying the DCI format 5A is scrambled by the SL-V-RNTI. For SPS semi-persistent scheduling, the base station passes IE: the SPS-ConfigSL-r14 configures one or more (up to 8) configured scheduling grants (configured grant), each configured scheduling grant containing a scheduling grant number (index) and a resource period of the scheduling grant. The UL grant (DCI format 5A) includes frequency domain resources of the psch, and indication information (3bits) of a scheduling grant number and indication information of SPS activation (activation) or release (release or deactivation). The CRC of the PDCCH or EPDCCH carrying the DCI format 5A is scrambled by SL-SPS-V-RNTI.

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

For semi-persistent scheduling SPS in transmission mode 3, the UE receives DCI format 5A scrambled by SL-SPS-V-RNTI on downlink subframe n. If the DCI format 5A contains indication information of SPS activation, the UE determines frequency domain resources of the PSSCH according to the indication information in the DCI format 5A, and determines time domain resources of the PSSCH (transmission sub-frame of the PSSCH) according to information such as sub-frame n and the like.

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

NR carrier and sidelink carrier

The carriers referred to in the description of the present invention all represent a segment of contiguous frequency domain resources in the frequency domain. The NR carrier indicates a frequency at which a serving cell serving the UE operates, and on the NR carrier, the UE performs reception of downlink transmission from the base station, uplink transmission of the UE itself, and the like. The Sidelink carrier indicates a frequency at which the UE performs Sidelink communication transmission and reception. The sidelink carrier referred to in the description of the present invention may represent an NR sidelink carrier, or an LTE sidelink carrier. On the NR sidelink carrier wave, the UE transmits and receives NR side row communication; on the LTE sidelink carrier, the UE transmits and receives LTE sidelink communications. The two same carriers represent that the frequency domain resources occupied by the two carriers are completely the same; two carriers are referred to as different carriers if their frequency domain resources do not completely coincide with each other.

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

Parameter set numerology includes both subcarrier spacing and cyclic prefix CP length implications. Where NR supports 5 subcarrier spacings, 15k, 30k, 60k, 120k, 240kHz (corresponding to μ ═ 0, 1, 2, 3, 4), and table 4.2-1 shows the set of supported transmission parameters, as shown below.

TABLE 4.2-1 NR supported subcarrier spacing

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

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

NR and LTE have the same definition for a subframe (subframe), indicating 1 ms. For subcarrier spacing configuration μ, the slot number within 1 subframe (1ms) may be expressed as

In the range of 0 to

The slot number within 1 system frame (frame, duration 10ms) can be expressed as

In the range of 0 to

Wherein the content of the first and second substances,

and

the definition of the case at different subcarrier spacings μ is shown in the table below.

Table 4.3.2-1: the number of symbols contained in each slot, the number of slots contained in each system frame and the number of slots contained in each subframe during normal CP

Table 4.3.2-2: when CP is expanded (60kHz), the number of symbols contained in each slot, the number of slots contained in each system frame, and the number of slots contained in each subframe

On the NR carriers, the numbered SFN of the system frame (or simply frame) ranges from 0 to 1023. The concept of a Direct system Frame number DFN is introduced in the sidelink communication, the numbering range being also 0 to 1023, and the above statements on the relation between system frames and numerology are equally applicable to Direct system frames (Direct Frame), e.g. a Direct system Frame having a duration equal to 10ms, a Direct system Frame comprising 10 slot slots for a subcarrier spacing of 15kHz, etc. DFN is applied for timing on sidelink carriers.

The double frame number referred to in the description of the present invention indicates the number of two consecutive frames in the time domain, and the double frame number SFN is based on the SFN numbers 0 to 1023₂The range of (1) is 0-511, 20ms corresponding to each double-frame number comprises two continuous system frames, the first frame is an even frame, and the second frame is an odd frame; or, the first frame is an odd frame, and the second frame is an even frame, which is not limited in the present invention.

Side communication resource pool (sidelink resource pool)

In the sidestream communication, the resources transmitted and received by the UE belong to a resource pool. For example, for a transmission mode based on base station scheduling in sidestream communication (transmission mode 1 in NR sidestream communication), the base station schedules transmission resources for sidelink UEs in the resource pool, or for a transmission mode based on UE perception in sidestream communication (transmission mode 2 in NR sidestream communication), the UEs determine transmission resources in the resource pool.

Configuration scheduling Admission (CG)

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

For the configuration scheduling grant of type 1 in NR side row communication, similarly, the base station configures the information of the configuration scheduling grant of type 1 for the UE through RRC signaling, where the configuration information of the configuration scheduling grant also includes the period of the resource. After the base station configures type 1CG, the UE may use the resource corresponding to the configured CG to perform sidelink communication transmission.

For the configuration scheduling permission of type 2 in the NR side row communication, the base station activates through DCI, or deactivates the corresponding configuration scheduling permission. The configuration information for configuring the scheduling grant also includes a resource period. When the base station activates type 2 CG, the UE may use the resource corresponding to the activated CG to perform sidelink communication transmission.

Retransmission in NR-sided row communication

In NR sidelink communications, the method for the ue to determine whether sidelink communications transmission is primary transmission or retransmission includes, but is not limited to:

there is at most one sidestream communication HARQ entity in the MAC entity of the user equipment. The sidelink communication HARQ entity maintains and maintains a plurality of parallel sidelink communication processes.

For each psch transmission, the sidestream HARQ entity performs the following process:

1> for valid (valid) SCI associated with PSSCH transmission:

2> if the NDI carried in the SCI is compared with the NDI in the last transmission corresponding to a pair of Layer 1 Destination identifier (Destination Layer-1ID) and Layer 1 Source identifier (Source Layer-1ID), the transmission is a first transmission corresponding to the pair of Layer 1 Destination identifier (Destination Layer-1ID) and Layer 1 Source identifier (Source Layer-1 ID):

3, allocating the transport block TB received by the physical layer and the related sidelink communication transmission information to an unoccupied sidelink communication process;

3> if the HARQ buffer (buffer) of the sidelink communication process is not empty: 4> then the HARQ buffer is emptied.

3> associate the SCI with the sidelink communication process and determine that the transmission is a primary communication new transmission (new transmission).

1> for each sidestream communication process:

2> if the NDI carried in the SCI is compared with the NDI in the last transmission corresponding to a pair of Layer 1 target identification (Destination Layer-1ID) and Layer 1 Source identification (Source Layer-1ID), the NDI is not inverted (not toggled):

and 3, allocating the transport block TB received by the physical layer and related side-line communication transmission information to the side-line communication process, and determining that the transmission is primary side communication retransmission (retransmission).

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

[ example one ]

Fig. 3 is a diagram illustrating a basic procedure of a method performed by a user equipment according to a first embodiment of the present invention.

The method executed by the ue according to the first embodiment of the present invention is described in detail below with reference to the basic process diagram shown in fig. 3.

As shown in fig. 3, in a first embodiment of the present invention, the steps performed by the user equipment include:

in step S101, the ue receives first configuration information and/or second configuration information of sidelink communications sent by the base station.

Optionally, the first configuration information sl-PDCCH-Config-r16 includes configuration information for monitoring a DCI format.

Optionally, the second configuration information sl-scheduled config-r16 at least includes configuration information sl-CS-RNTI of the radio network temporary identifier of the sidestream communication configuration scheduling grant.

Optionally, the first configuration information and/or the second configuration information of the sidestream communication configure the ue to monitor a downlink control information DCI format 3_0 where a CRC check code is scrambled by the sl-CS-RNTI.

In step S102, the user equipment listens to and receives DCI format 3_ 0.

Optionally, a New Data Indicator (NDI) field is included in the DCI format 3_ 0; optionally, the new data indication field NDI is set to 1.

Optionally, the DCI format 3_0 includes an indication field (Configuration index field) of a Configuration index; optionally, the indication field of the configuration index is 3 bits.

Optionally, if the CRC check code of the DCI format 3_0 is scrambled by the sl-CS-RNTI, and the DCI format 3_0 indicates retransmission of a configuration scheduling grant Configured grant (or the DCI format 3_0 indicates retransmission), the configuration index indication field is reserved (reserved) or the user equipment ignores (ignore) the configuration index indication field.

[ example two ]

Fig. 3 is a diagram showing a basic procedure of a method performed by a user equipment according to a second embodiment of the present invention.

Next, the method executed by the user equipment according to the second embodiment of the present invention is described in detail with reference to the basic process diagram shown in fig. 3.

As shown in fig. 3, in the second embodiment of the present invention, the steps performed by the user equipment include:

In step S102, the user equipment listens to and receives DCI format 3_ 0.

Optionally, if the CRC check code of the DCI format 3_0 is scrambled by the sl-CS-RNTI, and the user equipment considers (provider) that the DCI format 3_0 indicates (or schedules) a dynamic sidelink scheduling grant (dynamic sidelink grant), then the configuration index indication field is reserved (reserved) or the user equipment ignores (ignoror) the configuration index indication field,

alternatively, the first and second electrodes may be,

optionally, if the CRC check code of the DCI format 3_0 is scrambled by the sl-CS-RNTI, and the DCI format 3_0 indicates (or schedules) a dynamic sidelink communication scheduling grant (dynamic sidelink grant), then the configuration index indication field is reserved (reserved) or the user equipment ignores (ignore) the configuration index indication field.

[ third example ]

Fig. 3 is a diagram illustrating a basic procedure of a method performed by a user equipment according to a third embodiment of the present invention.

Next, the method executed by the user equipment according to the third embodiment of the present invention is described in detail with reference to the basic process diagram shown in fig. 3.

As shown in fig. 3, in the third embodiment of the present invention, the steps performed by the user equipment include:

In step S102, the user equipment listens to and receives DCI format 3_ 0.

Optionally, the DCI format 3_0 includes a New Data Indicator (NDI); optionally, the new data indication field NDI is set to 1.

Optionally, if the CRC check code of the DCI format 3_0 is scrambled by the sl-CS-RNTI, and the DCI format 3_0 is not used to activate or deactivate (or release) a sidestream communication configuration scheduling grant (of type 2), then the configuration index indication field is reserved (reserved) or the user equipment ignores (ignore) the configuration index indication field.

[ example four ]

Fig. 3 is a diagram illustrating a basic procedure of a method performed by a user equipment according to a fourth embodiment of the present invention.

Next, a method executed by the user equipment according to the fourth embodiment of the present invention is described in detail with reference to the basic process diagram shown in fig. 3.

As shown in fig. 3, in a fourth embodiment of the present invention, the steps performed by the user equipment include:

In step S102, the user equipment listens to and receives DCI format 3_ 0.

Optionally, the DCI format 3_0 includes an indication field of a HARQ process number.

Optionally, if the CRC check code of the DCI format 3_0 is scrambled by the sl-CS-RNTI, and the DCI format 3_0 indicates retransmission of a Configured scheduling grant Configured grant (or, the DCI format 3_0 indicates retransmission),

alternatively, the first and second electrodes may be,

the DCI format 3_0 indicates (or schedules) a dynamic sidelink communication scheduling grant (dynamic sidelink grant),

alternatively, the first and second electrodes may be,

the DCI format 3_0 is not used to activate or deactivate (or, release) the sidelink communication configuration scheduling grant (of type 2),

then, the DCI format 3_0 schedules retransmission of the scheduling grant of the sidelink communication configuration corresponding to the configuration index indication field and/or the HARQ process number.

Fig. 4 is a block diagram showing a user equipment UE according to the present invention. As shown in fig. 4, the user equipment UE80 includes a processor 801 and a memory 802. The processor 801 may include, for example, a microprocessor, microcontroller, embedded processor, or the like. The memory 802 may include, for example, volatile memory (e.g., random access memory RAM), a Hard Disk Drive (HDD), non-volatile memory (e.g., flash memory), or other memory, among others. The memory 802 has stored thereon program instructions. Which when executed by the processor 801 may perform the above-described method performed by the user equipment as described in detail herein.

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

It should be understood that the above-described embodiments of the present invention can be implemented by software, hardware, or a combination of both software and hardware. For example, various components within the base station and the user equipment in the above embodiments may be implemented by various means, including but not limited to: analog circuit devices, Digital Signal Processing (DSP) circuits, programmable processors, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), programmable logic devices (CPLDs), and the like.

In this application, a "base station" may refer to a mobile communication data and control switching center with a large transmission power and a wide coverage area, and includes functions of resource allocation scheduling, data receiving and transmitting, and the like. "user equipment" may refer to a user mobile terminal, including, for example, a mobile phone, a notebook, etc., which may wirelessly communicate with a base station or a micro base station.

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

Further, each functional block or respective feature of the base station device and the terminal device used in each of the above embodiments may be implemented or executed by a circuit, which is typically one or more integrated circuits. Circuitry designed to perform the various functions described in this specification may include a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC) or a general purpose integrated circuit, a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, or discrete hardware components, or any combination thereof. A general-purpose processor may be a microprocessor, or the processor may be an existing processor, controller, microcontroller, or state machine. The general-purpose processor or each circuit described above may be configured by a digital circuit, or may be configured by a logic circuit. Further, when advanced technology capable of replacing the current integrated circuit is developed due to the advancement of semiconductor technology, the present invention can also use the integrated circuit obtained by the advanced technology.

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

Claims

1. A method performed by a user equipment, comprising:

receiving first configuration information and/or second configuration information of sideline communication sent by a base station;

and monitoring and receiving Downlink Control Information (DCI) format 3_ 0.

2. The method performed by a user equipment according to claim 1,

the first configuration information comprises configuration information of a monitoring Downlink Control Information (DCI) format; and/or

The second configuration information at least comprises configuration information sl-CS-RNTI of a radio network temporary identifier of the sidestream communication configuration scheduling permission.

3. The method performed by a user equipment according to claim 2,

and the first configuration information and/or the second configuration information configure the user equipment to monitor a downlink control information DCI format 3_0 of a CRC check code scrambled by the sl-CS-RNTI.

4. The method performed by a user equipment according to claim 3,

the DCI format 3_0 includes a new data indication field; and/or

The DCI format 3_0 includes an indication field of a configuration index.

5. The method performed by the user equipment according to claim 4,

in case that a CRC check code of the DCI format 3_0 is scrambled by the sl-CS-RNTI and the DCI format 3_0 indicates retransmission configuring a scheduling grant or the DCI format 3_0 indicates retransmission,

and reserving the indication field of the configuration index or ignoring the indication field of the configuration index.

6. The method performed by the user equipment according to claim 4,

in case that the CRC check code of the DCI format 3_0 is scrambled by the sl-CS-RNTI and the user equipment considers that the DCI format 3_0 indicates or schedules a dynamic sidelink communication scheduling grant, or

In case the CRC check code of the DCI format 3_0 is scrambled by the sl-CS-RNTI and the DCI format 3_0 indicates or is scheduled to be a dynamic sidelink communications scheduling grant,

7. The method performed by the user equipment according to claim 4,

in case that the CRC check code of the DCI format 3_0 is scrambled by the sl-CS-RNTI and the DCI format 3_0 is not used for activating or deactivating or releasing a sidelink communication configuration scheduling grant,

8. The method performed by the user equipment according to claim 4,

the DCI format 3_0 includes an indication field of a HARQ process number.

9. The method performed by the user equipment of claim 8,

in case that a CRC check code of the DCI format 3_0 is scrambled by the sl-CS-RNTI and the DCI format 3_0 indicates retransmission configuring a scheduling grant or the DCI format 3_0 indicates retransmission, or

In the case that the DCI format 3_0 indicates or schedules a dynamic sidelink communication scheduling grant, or

In case the DCI format 3_0 is not used for activating or deactivating or releasing a sidelink communication configuration scheduling grant,

the DCI format 3_0 schedules retransmission of the sidelink communication configuration scheduling grant corresponding to the indication field of the configuration index and/or the HARQ process number.

10. A user equipment, comprising:

a processor; and

a memory storing instructions;

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