WO2023131074A1 - Method executed by user equipment and user equipment - Google Patents

Abstract

The present invention provides a method executed by a user equipment and a user equipment. The method comprises: choosing to generate a selected sidelink communication scheduling grant; executing sending resource selection or reselection; and determining that the earliest transmission opportunity in a time domain among all selected or reselected transmission opportunities is an initial transmission opportunity, and the other transmission opportunities are retransmission transmission opportunities.

Description

Method performed by user equipment and user equipment technical field

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

Background technique

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

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

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

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

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

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

2) 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 feasibility study topic of V2X based on D2D communication was approved. V2X stands for Vehicle to everything. It hopes to realize the interaction between the vehicle and all entity information that may affect the vehicle. The purpose is to reduce accidents, slow down traffic congestion, reduce environmental pollution and provide other information services. V2X application scenarios mainly include four aspects:

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

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

3) V2N, Vehicle to Network, that is, the vehicle is connected 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 focusing on V2V, based on LTE Release 12 and Release 13 D2D (also known as sidelink sidelink communication), that is, the development of proximity communication technology (see non-patent document 3). V2X stage 1 introduces a new D2D communication interface called PC5 interface. The PC5 interface is mainly used to solve the communication problem of cellular vehicle networking under the environment of high speed (up to 250 km/h) and high node density. Vehicles can exchange information such as position, speed and direction through the PC5 interface, that is, direct communication between vehicles can be performed through the PC5 interface. Compared with proximity communication between D2D devices, the functions introduced by LTE Release 14 V2X mainly include:

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

2) Introducing sub-channels to enhance resource allocation;

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

The second phase of the V2X research subject 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 feasibility research on transmit diversity.

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

In the 5G NR V2X project, a resource allocation mode 2 (resource allocation mode 2) based on user equipment sensing (sensing), or transmission mode 2, is supported. In resource allocation mode 2, the physical layer of the user equipment senses the transmission resources in the resource pool, and reports the set of available transmission resources to the upper layer. After the upper layer obtains the report of the physical layer, it performs resource selection or resource re-selection.

At the 3GPP RAN#90e plenary session in December 2020, the standardization research topic based on the already standardized NR sidelink enhancement (see Non-Patent Document 6) was approved. The enhancement of sidewalk communication includes the following three aspects:

1) Standardize resource allocation methods for reducing power saving of sidelink communication user equipment, including but not limited to: resource allocation methods based on partial sensing and resource allocation methods based on random resource selection;

2) Research on improving the communication reliability of resource allocation mode 2 in NR sideline communication and reducing the communication delay of resource allocation mode 2;

3) Standardized sideline communication discontinuous reception (SL Discontinuous Reception, SL DRX for short) mechanism. In 5G NR communication, user equipment supports receiving the physical downlink control channel PDCCH discontinuously in time, called DRX, which can effectively reduce the power consumption of communication equipment. Similarly, corresponding to SL DRX, discontinuous reception refers to receiving the physical sidelink communication control channel PSCCH in a part of the time domain, and this time is called the active period (Active time); the time when the PSCCH is not received is called Inactive period (In-active time).

The solution of this patent includes a method for sidelink communication user equipment to trigger resource selection or resource reselection when the user equipment is configured with SL DRX.

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: RP-202846, WID revision: NR sidelink enhancement

Contents of the invention

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

The method performed by the user equipment according to the first aspect of the present invention includes: selecting and generating a selected sidelink communication scheduling grant; performing transmission resource selection or reselection; and determining the earliest transmission opportunity in the time domain among all selected or reselected transmission opportunities The transmission opportunity of is an initial transmission opportunity, and the other transmission opportunities are retransmission transmission opportunities.

According to the method of the first aspect of the present invention, side communication data is available on the logical channel.

According to the method according to the first aspect of the present invention, the one selected sidelink communication scheduling grant corresponds to the transmission of multiple or one medium access control layer protocol data unit MAC PDU.

According to the method according to the first aspect of the present invention, if the resource selection or reselection is checked to trigger the resource selection or reselection, then the resource selection or reselection is sent.

According to the method of the first aspect of the present invention, the resource allocation method of the user equipment is: a resource allocation method based on perception; or a resource allocation method based on partial perception; or random resource selection.

According to the method of the first aspect of the present invention, if SL DRX is configured or activated or enabled for sideline communication discontinuous reception, or if the target corresponding to or associated with the MAC PDU is configured or activated or enabled for the SL DRX, the user equipment selects the first sidelink communication time-frequency resource for one transmission opportunity; and/or if one or more HARQ retransmissions are selected, the user equipment selects the one or multiple transmission opportunities Selecting a second sidelink communication time-frequency resource from available sidelink communication resources.

According to the method according to the first aspect of the present invention, the user equipment selects the first sidelink for the one transmission opportunity at least according to the time-frequency resource of the first sidelink communication within the active period of SLDRX communication time-frequency resource; and/or the user equipment selects the second sidelink communication time-frequency resource, at least making the selected second sidelink communication time-frequency resource and/or the first sidelink communication time The earliest resource in the time domain among the frequency resources is within the active period of the SL DRX.

According to the method according to the first aspect of the present invention, if the user equipment does not select HARQ retransmission, at least according to the time-frequency resource of the first sidelink communication within the active period of SLDRX, for the one transmission Opportunity to select the first sidelink communication time-frequency resource; and/or the user equipment selects the second sidelink communication time-frequency resource, at least making the selected second sidelink communication time-frequency resource and/or The earliest resource in the time domain among the first sidelink communication time-frequency resources is within the active period of the SL DRX.

According to the method according to the first aspect of the present invention, the user equipment selects the first sidelink for the one transmission opportunity at least according to the time-frequency resource of the first sidelink communication within the active period of SLDRX Communication time-frequency resources; and/or the user equipment selects the second sideline communication time-frequency resources, at least making the selected second sideline communication time-frequency resources located in the first sideline in the time domain After the communication time-frequency resource.

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

Beneficial effects of the present invention

In NR sidelink communication enhancement, for a target (Destination) user equipment configured with sidelink communication discontinuous reception SL DRX, when the sending user equipment selects sidelink communication resources for sidelink communication transmission to the target user equipment, The method of the present invention ensures that the initial transmission resource of the transmission is within the active period of the SLDRX of the target user equipment, so that the target user equipment can effectively receive the sidelink communication transmission, improving the reliability of the sidelink communication; at the same time, The energy consumption of the target user equipment can be reduced.

Description of drawings

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

Fig. 1 is a schematic diagram showing LTE V2X UE sidelink communication.

FIG. 2 is a schematic diagram showing a resource allocation method of LTE V2X.

Fig. 3 is a schematic diagram showing the basic process of the method executed by the user equipment in Embodiments 1, 2 and 3 of the invention.

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

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments. 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 known technologies that are not directly related to the present invention are omitted to prevent confusion to the understanding of the present invention.

The following describes multiple implementations of the present invention in detail by taking the 5G mobile communication system and its subsequent evolved versions as an example application environment. However, it should be pointed out that the present invention is not limited to the following embodiments, but is applicable to more other wireless communication systems, such as communication systems after 5G and 4G mobile communication systems before 5G.

Some of the terms involved in the present invention are described below, and the terms involved in the present invention are defined here unless otherwise specified. The terms given by the present invention may adopt different naming methods in LTE, LTE-Advanced, LTE-Advanced Pro, NR and subsequent communication systems, but the present invention adopts a unified term, and when applied to a specific system, Can be replaced by the term 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 wireless, new air interface

PDCCH: Physical Downlink Control Channel, physical downlink control channel

DCI: Downlink Control Information, downlink control information

PDSCH: Physical Downlink Shared Channel, physical downlink shared channel

UE: User Equipment, 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

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

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

CSI: Channel State Information, channel state information

HARQ: Hybrid Automatic Repeat Request, Hybrid Automatic Repeat Request

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

CRS: Cell Reference Signal, cell-specific reference signal

PUCCH: Physical Uplink Control Channel, physical uplink control channel

PUSCH: Physical Uplink Shared Channel, physical uplink shared channel

UL-SCH: Uplink Shared Channel, uplink shared channel

CG: Configured Grant, configuration scheduling permission

Sidelink: side travel communication

SCI: Sidelink Control Information, side 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 unit

CRB: Common Resource Block, public 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 receiving 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 sidelink communication discovery channel

PSBCH: Physical Sidelink Broadcast Channel, physical sidelink broadcast channel

SFI: Slot Format Indication, slot format indication

TDD: Time Division Duplexing, Time Division Duplex

FDD: Frequency Division Duplexing, Frequency Division Duplex

SIB: System Information Block, system information block

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

SLSS: Sidelink synchronization Signal, side communication synchronization signal

PSSS: Primary Sidelink Synchronization Signal, primary sidelink synchronization signal

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

PCI: Physical Cell ID, physical cell identification

PSS: Primary Synchronization Signal, primary synchronization signal

SSS: Secondary Synchronization Signal, secondary synchronization signal

BWP: BandWidth Part, bandwidth fragment/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, main cell group

SCG: Secondary Cell Group, secondary cell group

PCell: Primary Cell, main cell

SCell: Secondary Cell, auxiliary cell

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

SPS: Semi-Persistant Scheduling, semi-static scheduling

TA: Timing Advance, uplink timing advance

PT-RS: Phase-Tracking Reference Signals, phase tracking reference signal

TB: Transport Block, transmission block

CB: Code Block, coding block/code block

QPSK: Quadrature Phase Shift Keying, Quadrature Phase Shift Keying

16/64/256 QAM: 16/64/256 Quadrature Amplitude Modulaion, quadrature amplitude modulation

AGC: Auto Gain Control, automatic gain control

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

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

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

SC-FDMA: Single Carrier-Frequency Division Multiple Access, single carrier-frequency division multiple access

MAC: Medium Access Control, media access control layer

PDU: Protocol Data Unit, protocol data unit

DRX: Discontinuous Reception, discontinuous reception

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

It is worth pointing out that the V2X mentioned in the description of the present invention has the same meaning as the sidelink. V2X in this article can also mean sidelink; similarly, sidelink in this article can also mean V2X, which will not be specifically distinguished and limited in the following text.

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

The PSCCH in the specification of the present invention is used to carry the SCI. The PSCCHs involved in the description of the present invention correspond to, or correspond to, or relate to, or the scheduled PSSCHs have the same meaning, and they all represent associated PSSCH or corresponding PSSCH. Similarly, the corresponding, or corresponding, or related SCIs (including the first-level SCI and the second-level SCI) of the PSSCH mentioned in the specification have the same meaning, and all indicate associated SCU or corresponding SCI. It is worth pointing out that the first level SCI is called 1st stage SCI or SCI format 1-A, which is transmitted in PSCCH; the second level SCI is called 2nd stage SCI or SCI format 2-A (or, SCI format 2-B) , transmitted in the resources of the corresponding PSSCH.

The parameter set (numerology) in NR (including NR sidelink) and in NR (including NR sidelink) time slot slot

The parameter set numerology includes two meanings of subcarrier spacing and cyclic prefix CP length. Among them, NR supports 5 sub-carrier intervals, which are 15k, 30k, 60k, 120k, and 240kHz (corresponding to μ=0, 1, 2, 3, 4). Table 4.2-1 shows the supported transmission parameter set, as follows shown.

Table 4.2-1 Subcarrier spacing supported by NR

mu	Δf＝ 2μ ·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 spacings. For a normal (Normal) CP, each slot contains 14 OFDM symbols; for an extended CP, each slot contains 12 OFDM symbols. For μ=0, that is, 15kHz subcarrier spacing, 1 time slot=1ms; μ=1, that is, 30kHz subcarrier spacing, 1 time slot=0.5ms; μ=2, that is, 60kHz subcarrier spacing, 1 time slot =0.25ms, and so on.

NR and LTE have the same definition for a subframe (subframe), which means 1 ms. For subcarrier spacing configuration μ, the slot number in 1 subframe (1ms) can be expressed as

range from 0 to

The slot number in a system frame (frame, duration 10ms) can be expressed as

range from 0 to

in,

and

The definition of the situation at different subcarrier spacing μ is shown in the table below.

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

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

On the NR carrier, the number SFN of the system frame (or frame for short) ranges from 0 to 1023. The concept of direct system frame number DFN is introduced in side communication, and the number range is also 0 to 1023. The above description of the relationship between system frame and numerology can also be applied to direct system frame, for example, the duration of a direct system frame Also equal to 10ms, for a subcarrier spacing of 15kHz, a direct system frame includes 10 time slots, and so on. DFN is applied to the timing timing on the sidelink carrier.

LTE (including LTE V2X) parameter set and time slot slot in LTE (including LTE V2X) and subframe subframe

LTE only supports subcarrier spacing of 15kHz. Extended (Extended) CP is supported in LTE, and normal CP is also supported. The subframe subframe has a duration of 1 ms and includes two slots, and each slot has a duration of 0.5 ms.

For normal (Normal) CP, each subframe contains 14 OFDM symbols, and each slot in the subframe contains 7 OFDM symbols; for extended CP, each subframe contains 12 OFDM symbols, and each slot in the subframe contains 6 OFDM symbols.

Resource block RB and resource unit RE

A resource block RB is defined in the frequency domain as

consecutive subcarriers, for example, for a subcarrier spacing of 15kHz, the RB is 180kHz in the frequency domain. For a subcarrier spacing of 15kHz×2 ^μ , a resource element RE represents one subcarrier in the frequency domain and one OFDM symbol in the time domain.

Scenario of Sidelink communication

1) Out-of-Coverage sidelink communication: Both UEs performing sidelink communication have no network coverage (for example, the UE cannot detect any cell that satisfies the "cell selection criterion" on the frequency that needs to perform sidelink communication cell, indicating that the UE has no network coverage).

2) Sidelink communication with network coverage (In-Coverage): 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 to perform sidelink communication, Indicates that the UE has network coverage).

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

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

Basic process of LTE V2X (sidelink) communication

Fig. 1 is a schematic diagram showing LTE V2X UE sidelink communication. First, UE1 sends sidelink communication control information (SCI format 1) to UE2, which is carried by the physical layer channel PSCCH. SCI format 1 includes PSSCH scheduling information, such as PSSCH frequency domain resources. Secondly, UE1 sends sidelink communication data to UE2, which is carried by the physical layer channel PSSCH. The PSCCH and the corresponding PSSCH adopt frequency division multiplexing, that is, the PSCCH and the corresponding PSSCH are located in the same subframe in the time domain, and are located in different RBs in the frequency domain. In LTE V2X, a transmission block TB may contain only one initial transmission, or one initial transmission and one blind retransmission (blind retransmission, which means retransmission not based on HARQ feedback).

The specific design methods of PSCCH and 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 predefined values 510 . SCI format 1 can be carried in PSCCH, wherein SCI format 1 includes at least frequency domain resource information of PSSCH. For example, for the frequency domain resource indication domain, SCI format 1 indicates the starting sub-channel number and the number of continuous sub-channels of the PSSCH corresponding to the PSCCH.

2) The PSSCH occupies one 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 RBs in the frequency domain. The n _subCHsize is configured by the RRC parameter, the number of starting sub-channels and continuous sub-channels Indicated by the frequency domain resource indication field of SCI format 1.

LTE V2X resource allocation method Transmission Mode 3/4

Figure 2 shows two resource allocation methods of LTE V2X, which are called resource allocation based on base station scheduling (Transmission Mode 3) and resource allocation based on UE sensing (Transmission Mode 4). In NR sidelink communication, transmission mode 3 of LTE V2X corresponds to transmission mode 1 in NR V2X, which is a transmission mode based on base station scheduling; transmission mode 4 of LTE V2X corresponds to transmission mode 2 in NR V2X, which is based on UE perception transfer mode. In LTE V2X, when there is eNB network coverage, the base station can configure the resource allocation mode of the UE through UE-level dedicated RRC signaling (dedicated RRC signaling) SL-V2X-ConfigDedicated, or called the transmission mode of the UE ,Specifically:

1) Resource allocation method based on base station scheduling (Transmission Mode 3): The resource allocation method based on base station scheduling means that the frequency domain resources used by the sidelink sidelink communication come from the scheduling of the base station. Transmission mode 3 includes two scheduling methods, namely dynamic scheduling and semi-persistent scheduling (SPS). For dynamic scheduling, the UL grant (DCI format 5A) includes PSSCH frequency domain resources, and the CRC of PDCCH or EPDCCH carrying DCI format 5A is scrambled by SL-V-RNTI. For SPS semi-persistent scheduling, the base station configures one or more (up to 8) configured scheduling grants (configured grants) through IE: SPS-ConfigSL-r14, and each configured scheduling grant contains a scheduling grant number (index) and scheduling Licensed resource period. The UL grant (DCI format 5A) includes the frequency domain resources of the PSSCH, and the indication information (3 bits) of the scheduling grant number and the indication information of SPS activation (activate) or release (release, or deactivation). The CRC of PDCCH or EPDCCH carrying DCI format 5A is scrambled by SL-SPS-V-RNTI.

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 or SL-SPS-V-RNTI through RRC signaling, and uses PDCCH or EPDCCH (DCI format 5A, CRC uses SL-V-RNTI scrambling or SL-SPS-V-RNTI scrambling ) sending an uplink scheduling grant UL grant to the UE. The above-mentioned uplink scheduling grant UL grant includes at least scheduling information of PSSCH frequency domain resources in sidelink communication. When the UE successfully monitors the PDCCH or EPDCCH scrambled by SL-V-RNTI or SL-SPS-V-RNTI, the PSSCH frequency domain resource indication field in the uplink scheduling grant UL grant (DCI format 5A) is used as the PSCCH (SCI format 1) PSSCH frequency domain resource indication information, and send PSCCH (SCI format 1) and the corresponding PSSCH.

For the 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 DCI format 5A contains SPS activation indication information, the UE determines the frequency domain resources of PSSCH according to the indication information in DCI format 5A, and determines the time domain resources of PSSCH (PSSCH transmission subframe) according to subframe n and other information.

2) Resource allocation mode based on UE sensing (Transmission Mode 4): The resource allocation mode 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. When the RRC signaling SL-V2X-ConfigDedicated is set to ue-Selected-r14, it indicates that the UE is configured as a 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 sidelink transmission resources of the PSSCH in the transmission resource pool (resource pool) according to certain rules (for a detailed process description, refer to the LTE V2X UE sensing process section) , and send PSCCH (SCI format 1) and corresponding PSSCH.

sidelink resource pool

In sidelink communication, the resources sent and received by the UE belong to the resource pool resource pool. For example, for the transmission mode based on base station scheduling in sidelink communication, the base station schedules transmission resources for sidelink UEs in the resource pool, or, for the transmission mode based on UE perception in sidelink communication, the UE determines transmission resources in the resource pool.

Perception-based resource allocation

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

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

In the resource allocation method based on sensing (or partial sensing), the upper layer requests or triggers the physical layer to determine resources for PSSCH/PSCCH transmission on time slot n (for sensing or partial sensing). The resource selection window is defined as [n+T1, n+T2], that is, the user equipment selects transmission resources within this window. Among them, T1 satisfies the condition

The selection of T1 depends on the implementation of the user equipment; the RRC configuration information includes a configuration list sl-SelectionWindowList of a resource selection window, wherein, the list corresponds to a given priority prio _TX (priority of transmitting PSSCH) element representation It is T _2min . If the T _2min is less than the remaining packet delay budget (remaining packet delay budget, referred to as remaining PDB), then T2 satisfies the condition T _2min ≤ T2 ≤ remaining PDB, and the selection of T2 depends on the implementation of the user equipment; otherwise, T2 is set to remaining PDB.

The definition of is as follows (μ _SL represents the subcarrier spacing parameter of side communication, that is, the subcarrier spacing is

):

Table 8.1.4-2:

value of

Table 8.1.4-1:

value of

Side communication discontinuous reception SL DRX

In 5G NR communication, user equipment supports receiving the physical downlink control channel PDCCH discontinuously in time, called DRX, which can effectively reduce the power consumption of communication equipment. Similarly, corresponding to SL DRX, discontinuous reception refers to monitoring side communication control information SCI (including level 1 SCI and level 2 SCI) in a part of the time domain, and this time is called the active period (Active time ).

In sideline communication, for unicast, the sending user equipment configures the relevant configuration information of SL DRX for the receiving user equipment through sideline communication RRC signaling (PC5RRC); for groupcast (groupcast) and broadcast (broadcast), In the case of base station coverage, the base station configures SL DRX related configuration information for the sidelink communication user equipment through a broadcast message (SIB).

Layer 2 ID (Layer-2 ID) and Layer 1 ID (Layer-1 ID) in sideline communication

In lateral communication, layer 2 identification includes source layer 2 identification (Source layer-2 ID) and target layer 2 identification (Destination layer-2 ID). Both source layer 2 identification and target layer 2 identification are 24 bits. Layer 1 ID includes source layer 1 ID (Source layer-1 ID) and target layer 1 ID (Destination layer-1 ID). Wherein, the source layer 1 identifier represents the last 8 bits of the source layer 2 identifier (the first bit from the left is the first bit); the target layer 1 identifier represents the last 16 bits of the target layer 2 identifier. Both the source layer 1 identifier and the target layer 1 identifier are carried in the secondary SCI. The first 16 bits of the source layer 2 identifier and the first 8 bits of the target layer 2 identifier are in the sub-header (MAC PDU sub-header) of the MAC PDU corresponding to the secondary SCI.

Resource selection (or, reselection) check (check)

In sidelink communication, a mechanism for checking selected sidelink communication resources is supported. For example, when the configuration information of the resource pool for sidelink communication is reconfigured, the result of the resource selection (reselection) check triggers the user equipment to perform a resource selection (or, reselection) process. The result of the resource selection (reselection) check is to trigger the user equipment to perform a resource selection (or reselection) process, including but not limited to the reconfiguration of the above resource pool configuration information.

Hereinafter, specific examples, examples, and the like according to the present invention will be described in detail. In addition, as mentioned above, the example and Example etc. which were described in this indication are illustrations for easy understanding of this invention, and do not limit this invention.

[Example 1]

Fig. 3 is a schematic diagram showing the basic process of the method executed by the user equipment according to Embodiment 1 of the present invention.

Next, the method executed by the user equipment according to Embodiment 1 of the present invention will be described in detail in conjunction with the basic process diagram shown in FIG. 3 .

As shown in FIG. 3, in Embodiment 1 of the present invention, the steps performed by the user equipment include:

In step S101, the sidelink communication user equipment selects and generates a selected sidelink communication scheduling grant (selected sidelink grant), and, optionally, sidelink communication data is available on a logical channel.

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

In step S102, the user equipment performs (performs) a transmission resource selection (reselection) process.

Wherein, optionally, if the result of the resource selection (or reselection) check triggers resource selection (or reselection), then the user equipment performs a process of sending resource selection (or reselection).

Optionally, the resource allocation manner of the user equipment is a perception-based resource allocation manner, or a partial perception-based resource allocation manner, or a random resource selection.

Wherein, optionally, if the discontinuous reception of SL DRX is configured (activated, or enabled) for sideline communication, or, optionally, if (the MAC PDU corresponds (or, associated)) the target (Destination ) configured (activated, or, enabled) SL DRX, or, optionally, for unicast transmission, if (the MAC PDU corresponds to (or, associated)) a pair of source layer 1 (or, layer 2 ) ID and target layer 1 (or, layer 2) ID are configured (activated, or enabled) SL DRX, for multicast and broadcast transmission, if (the MAC PDU corresponds (or, associated)) target layer 1 (or, layer 2) indicates that SL DRX is configured (activated, or enabled), then,

The user equipment (randomly) selects the sidelink communication time-frequency resource r _i for one transmission opportunity (one transmission opportunity), at least according to: the sidelink communication time-frequency resource r _i is in the active period (active period) of the SL DRX time), and/or,

If the user equipment selects one or more HARQ retransmissions, the user equipment selects (randomly) sidelink communication time-frequency resources from available sidelink communication resources for the one or more transmission opportunities , so that at least: the selected sidelink communication time-frequency resource and/or the earliest resource in the time domain in the r _i is within the active period of the SL DRX.

In step S103, the user equipment determines that among all the selected transmission opportunities, the earliest transmission opportunity in the time domain is the initial transmission opportunity, and the other transmission opportunities are retransmission transmission opportunities.

[Example 2]

Next, the method executed by the user equipment according to Embodiment 2 of the present invention will be described in detail in conjunction with the basic process diagram shown in FIG. 3 .

As shown in FIG. 3, in Embodiment 2 of the present invention, the steps performed by the user equipment include:

In step S101, the sidelink communication user equipment selects to create a selected sidelink communication scheduling grant (selected sidelink grant), and, optionally, sidelink communication data is available on the logical channel.

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

In step S102, the user equipment performs (performs) a transmission resource selection (reselection) process.

Wherein, optionally, if the result of the resource selection (or reselection) check triggers resource selection (or reselection), then the user equipment performs a process of sending resource selection (or reselection).

Optionally, the resource allocation manner of the user equipment is a perception-based resource allocation manner, or a partial perception-based resource allocation manner, or a random resource selection.

Wherein, optionally, if the discontinuous reception of SL DRX is configured (activated, or enabled) for sideline communication, or, optionally, if (the MAC PDU corresponds (or, associated)) the target (Destination ) configured (activated, or, enabled) SL DRX, or, optionally, for unicast transmission, if (the MAC PDU corresponds to (or, associated)) a pair of source layer 1 (or, layer 2 ) ID and target layer 1 (or, layer 2) ID are configured (activated, or enabled) SL DRX, for multicast and broadcast transmission, if (the MAC PDU corresponds (or, associated)) target layer 1 (or, layer 2) indicates that SL DRX is configured (activated, or enabled), then,

The user equipment (randomly) selects a sidelink communication time-frequency resource r _i for one transmission opportunity. Optionally, if the user equipment does not select HARQ retransmission, at least according to: the sidelink communication The time-frequency resource r _i is within the active period (active time) of the SL DRX, and/or,

If the user equipment selects one or more HARQ retransmissions, the user equipment selects (randomly) sidelink communication time-frequency resources from available sidelink communication resources for the one or more transmission opportunities , so that at least: the selected sidelink communication time-frequency resource and/or the earliest resource in the time domain in the r _i is within the active period of the SL DRX.

In step S103, the user equipment determines that among all the selected transmission opportunities, the earliest transmission opportunity in the time domain is the initial transmission opportunity, and the other transmission opportunities are retransmission transmission opportunities.

[Embodiment three]

Next, the method executed by the user equipment according to Embodiment 3 of the present invention will be described in detail in conjunction with the basic process diagram shown in FIG. 3 .

As shown in FIG. 3, in Embodiment 3 of the present invention, the steps performed by the user equipment include:

In step S101, the sidelink communication user equipment selects to create a selected sidelink communication scheduling grant (selected sidelink grant), and, optionally, sidelink communication data is available on the logical channel.

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

In step S102, the user equipment performs (performs) a transmission resource selection (reselection) process.

Wherein, optionally, if the result of the resource selection (or reselection) check triggers resource selection (or reselection), then the user equipment performs a process of sending resource selection (or reselection).

Optionally, the resource allocation manner of the user equipment is a perception-based resource allocation manner, or a partial perception-based resource allocation manner, or a random resource selection.

Wherein, optionally, if the discontinuous reception of SL DRX is configured (activated, or enabled) for sideline communication, or, optionally, if the target (corresponding to (or associated with) the MAC PDU) (Destination) SL DRX is configured (activated, or enabled), or, optionally, for unicast transmission, if (the MAC PDU corresponds (or, associated)) a pair of source layer 1 (or, Layer 2) identification and target layer 1 (or, layer 2) identification are configured (activated, or enabled) SL DRX, for multicast and broadcast transmission, if (the MAC PDU corresponds to (or, associated)) The target layer 1 (or, layer 2) flag is configured (activated, or enabled) with SL DRX,

Then, the user equipment (randomly) selects the sidelink communication time-frequency resource r _i for one transmission opportunity, at least according to: the sidelink communication time-frequency resource r _i is in the active period of the SL DRX (active time), and/or,

If the user equipment selects one or more HARQ retransmissions, the user equipment selects (randomly) sidelink communication time-frequency resources from available sidelink communication resources for the one or more transmission opportunities , so that at least: the selected sidelink communication time-frequency resource is located behind the r _i in the time domain.

In step S103, the user equipment determines that among all the selected transmission opportunities, the earliest transmission opportunity in the time domain is the initial transmission opportunity, and the other transmission opportunities are retransmission transmission opportunities.

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, a microcontroller, an embedded processor, and the like. The memory 802 may include, for example, a volatile memory (such as a random access memory RAM), a hard disk drive (HDD), a nonvolatile memory (such as a flash memory), or other memories. Memory 802 has program instructions stored thereon. When the instruction is executed by the processor 801, the above method described in detail in the present invention and executed by the user equipment may be executed.

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 embodiments described above can be combined with each other without conflicts. 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 the like. 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. Numerous variations and modifications may be made by those skilled in the art in light of the teachings of the illustrated embodiments.

It should be understood that the above-mentioned embodiments of the present invention may be implemented by software, hardware, or a combination of software and hardware. For example, various components inside the base station and user equipment in the above embodiments can be realized by various devices, including but not limited to: analog circuit devices, digital circuit devices, digital signal processing (DSP) circuits, programmable processing Devices, Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs), Programmable Logic Devices (CPLDs), etc.

In this application, "base station" may refer to a mobile communication data and control switching center with relatively large transmission power and wide coverage area, including functions such as resource allocation and scheduling, data reception and transmission. "User equipment" may refer to a user's mobile terminal, including, for example, a mobile phone, a notebook, and other terminal equipment capable of wirelessly communicating with a base station or a micro base station.

Furthermore, embodiments of the present invention disclosed herein may be implemented on a computer program product. More specifically, the computer program product is a product having a computer-readable medium encoded with computer program logic that, when executed on a computing device, provides associated operations to implement Above-mentioned technical scheme of the present invention. When executed on at least one processor of a computing system, the computer program logic causes the processor to execute the operations (methods) described in the embodiments of the present invention. Such arrangements of the invention are typically provided as software, code and/or other data structures arranged or encoded on a computer-readable medium such as an optical medium (e.g., CD-ROM), floppy disk, or hard disk, or as one or more other media of firmware or microcode on a ROM or RAM or PROM chip, or a downloadable software image in one or more modules, a shared database, etc. Software or firmware or such configurations can be installed on the 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 terminal device used in each of the above embodiments may be implemented or executed by a circuit, and the circuit is generally one or more integrated circuits. Circuits designed to perform the various functions described in this specification may include general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs) or general-purpose integrated circuits, field-programmable gate arrays (FPGAs), or other possible Program logic devices, discrete gate or transistor logic, or discrete hardware components, or any combination of the above. A general-purpose processor can be a microprocessor, or the processor can 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 an advanced technology that can replace the current integrated circuit appears due to the progress of semiconductor technology, the present invention can also use an integrated circuit obtained by using the advanced technology.

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

Claims (10)

1. A method performed by user equipment, comprising:

   select to generate a selected sideline communication dispatch permit;

   perform transmission resource selection or reselection; and

   It is determined that among all the selected or reselected transmission opportunities, the earliest transmission opportunity in the time domain is the initial transmission opportunity, and the other transmission opportunities are retransmission transmission opportunities.
2. The method according to claim 1, characterized in that,

   On logical channels, sideline communication data is available.
3. The method according to claim 1, characterized in that,

   The one selected sidelink communication scheduling permission corresponds to the transmission of multiple or one medium access control layer protocol data unit MAC PDU.
4. The method according to any one of claims 1-3, characterized in that,

   If the checking result of the resource selection or reselection is to trigger the resource selection or reselection, then perform sending resource selection or reselection.
5. The method according to any one of claims 1-3, characterized in that,

   The resource allocation method of the user equipment is:

   perception-based resource allocation; or

   resource allocation based on partial awareness; or

   Random resource selection.
6. The method according to claim 3, characterized in that,

   If the discontinuous reception of SL DRX is configured or activated or enabled, or if the target corresponding to or associated with the MAC PDU configures or activates or enables the SL DRX, the user equipment is a transmission opportunity Selecting a first lateral communication time-frequency resource; and/or

   If one or more HARQ retransmissions are selected, the user equipment selects a second sidelink communication time-frequency resource from available sidelink communication resources for the one or more transmission opportunities.
7. The method according to claim 6, characterized in that,

   The user equipment selects the first sidelink communication time-frequency resource for the one transmission opportunity at least according to the first sidelink communication time-frequency resource within the active period of SLDRX; and/or

   The user equipment selects the second sidelink communication time-frequency resource at least so that the earliest time-frequency resource in the time domain among the selected second sidelink communication time-frequency resource and/or the first sidelink communication time-frequency resource The resource is within the active period of the SL DRX.
8. The method according to claim 6, characterized in that,

   If the user equipment does not select HARQ retransmission, select the first sidelink communication time-frequency resource for the one transmission opportunity at least according to the active period of the first sidelink communication time-frequency resource in SLDRX ;and / or

   The user equipment selects the second sidelink communication time-frequency resource at least so that the earliest time-frequency resource in the time domain among the selected second sidelink communication time-frequency resource and/or the first sidelink communication time-frequency resource The resource is within the active period of the SL DRX.
9. The method according to claim 6, characterized in that,

   The user equipment selects the first sidelink communication time-frequency resource for the one transmission opportunity at least according to the first sidelink communication time-frequency resource within the active period of SLDRX; and/or

   The user equipment selects the second sidelink communication time-frequency resource at least such that the selected second sidelink communication time-frequency resource is located behind the first sidelink communication time-frequency resource in the time domain.
10. A user equipment, comprising:

    processor; and

    a memory storing instructions;

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

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