WO2022111630A1

WO2022111630A1 - Method executed by user equipment and user equipment

Info

Publication number: WO2022111630A1
Application number: PCT/CN2021/133493
Authority: WO
Inventors: 赵毅男; 罗超; 刘仁茂
Original assignee: 夏普株式会社; 赵毅男
Priority date: 2020-11-30
Filing date: 2021-11-26
Publication date: 2022-06-02
Also published as: CN114641066A

Abstract

Provided in the present invention are a method executed by a user equipment and a user equipment. The method comprises: sidelink communication configuration information is obtained; a high layer provides parameters for PSSCH/PSCCH transmission; and candidate resources are determined or identified.

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 performed by a user equipment and a corresponding user equipment.

Background technique

In traditional cellular networks, all communications must go through base stations. The difference is that D2D communication (Device-to-Device communication, direct device-to-device 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 meeting of the 3rd Generation Partnership Project (3GPP) in March 2014, a research topic on implementing adjacent 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, a research project for enhanced LTE eD2D (enhanced D2D) was approved (see Non-Patent Document 2). The main features introduced by LTE Release 13 eD2D include:

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

2) The priority processing mechanism of D2D communication.

Based on the design of the D2D communication mechanism, at the RAN#68 plenary meeting of 3GPP in June 2015, the V2X feasibility study topic based on D2D communication was approved. V2X stands for Vehicle to everything, hoping to realize the exchange of information between vehicles and all entities that may affect vehicles, with the purpose of reducing accidents, slowing traffic congestion, reducing environmental pollution and providing other information services. The application scenarios of V2X 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 a warning to pedestrians or non-motor 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 communication), that is, the development of proximity communication technology (see Non-Patent Document 3). V2X stage 1 introduces a new D2D communication interface called the PC5 interface. The PC5 interface is mainly used to solve the communication problems of cellular vehicle networking in high-speed (up to 250 km/h) and high-node density environments. Vehicles can interact with information such as position, speed and direction through the PC5 interface, that is, vehicles can communicate directly through the PC5 interface. Compared with the proximity communication between D2D devices, the functions introduced by LTE Release 14 V2X mainly include:

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

2) Introduce sub-channels to enhance resource allocation;

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

The second phase of the V2X research topic belongs to the research scope 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 a feasibility study of 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 Document 5) was approved.

In the 5G NR V2X project, a resource allocation mode 2 (resource allocation mode 2) based on user equipment sensing (sensing) is supported, or transmission mode 2. 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 obtaining the report of the physical layer, the upper layer selects the resources specifically used for the transmission of sideline communication.

The solution of this patent mainly includes a method for the user equipment to determine (or, identify) a candidate resource set in a resource allocation manner based on user equipment perception.

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 literature 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

SUMMARY OF THE INVENTION

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

The method performed by the user equipment according to the first aspect of the present invention includes: acquiring sidelink communication configuration information; providing parameters for PSSCH/PSCCH transmission by a higher layer; determining or identifying candidate resources.

According to the above method of the first aspect of the present invention, the sidelink communication configuration information is sent by the base station gNB through RRC signaling; or the sidelink communication configuration information is included in the preconfiguration information SL-PreconfigurationNR.

According to the above method of the first aspect of the present invention, the sideline communication configuration information at least includes configuration information of the start symbol sl-StartSymbol and the number of symbols sl-LengthSymbols used for sideline communication in one slot.

According to the above method of the first aspect of the present invention, the resource allocation method of the user equipment is a resource allocation method based on the perception of the user equipment; and/or the high layer is a medium access control MAC layer.

According to the above method of the first aspect of the present invention, the parameter for PSSCH/PSCCH transmission includes at least the number L _subCH of sub-channels used for PSSCH/PSCCH transmission.

According to the above method of the first aspect of the present invention, a single slot candidate resource is defined as a slot in the resource pool

and/or the user equipment considers or assumes that within a certain time interval, any _{set of the L subCH} _consecutive subchannels included in the resource pool corresponds to the one single-slot candidate resource.

According to the above method of the first aspect of the present invention, when the sl-LengthSymbols is less than or equal to 9 from the candidate resources, the one single-slot candidate corresponding to the time slot including the PSFCH resource of the physical sidelink communication feedback channel is removed. resource.

According to the above method of the first aspect of the present invention, the time slot

The corresponding PSSCH transmission symbol number 1 _d is greater than or equal to 6; and/or the one single-slot candidate resource on the time slot whose corresponding PSSCH transmission symbol number 1 _d is less than 6 is removed.

time-domain patterns of DMRSs corresponding to one or more PSSCHs; and/or removing the one single-slot candidate resource on the time-domain patterns of DMRSs that do not correspond to one or more PSSCHs.

A user equipment according to a first aspect of the present invention includes: a processor; and a memory storing instructions; wherein the instructions are executed by the processor when executed in the method performed by the user equipment according to the above-mentioned first aspect The method of any one.

The beneficial effects of the present invention

According to the solution of this patent, in NR V2X sideline communication, for resource allocation mode 2 based on user equipment perception, the solution of the present invention can ensure that all resources included in the candidate resource set can be used for the physical sideline communication shared channel PSSCH and the resources selected by the medium access control MAC layer of the user equipment can be used for PSSCH transmission, which improves the efficiency of user equipment perception and the transmission reliability of sideline communication.

Description of drawings

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

FIG. 1 is a schematic diagram illustrating sideline communication of an LTE V2X UE.

FIG. 2 is a schematic diagram illustrating a resource allocation manner of LTE V2X.

Fig. 3 is a schematic diagram showing the basic process of the method executed by the user equipment in the first, second and third embodiments of the invention.

FIG. 4 is a schematic diagram illustrating a basic process of a method performed by a user equipment in Embodiment 4 of the invention.

FIG. 5 is a schematic diagram illustrating a basic process of a method performed by a user equipment in Embodiment 5 of the invention.

FIG. 6 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 with reference to 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 well-known technologies not directly related to the present invention are omitted in order to avoid obscuring the understanding of the present invention.

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

Part of the terms involved in the present invention are described below. Unless otherwise specified, the terms involved in the present invention are defined here. The terms given in the present invention may adopt different naming methods in LTE, LTE-Advanced, LTE-Advanced Pro, NR and later communication systems, but unified terms are adopted in the present invention. When applied to a specific system, Can be substituted with the term used in the corresponding system.

3GPP: 3rd 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, the temporary identifier of the cell wireless network

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, configure scheduling permission

Sidelink: Sideline 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, common resource block

CP: Cyclic Prefix, cyclic prefix

PRB: Physical Resource Block, physical resource block

PSSCH: Physical Sidelink Shared Channel, Physical Sidelink Shared Channel

FDM: Frequency Division Multiplexing, frequency division multiplexing

RRC: Radio Resource Control, Radio Resource Control

RSRP: Reference Signal Receiving Power, reference signal 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 Communication Broadcast Channel

SFI: Slot Format Indication, slot format indication

TDD: Time Division Duplexing

FDD: Frequency Division Duplexing, frequency division duplexing

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

SLSS: Sidelink synchronization Signal, side communication synchronization signal

PSSS: Primary Sidelink Synchronization Signal, side communication main synchronization signal

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

PCI: Physical Cell ID, physical cell identification

PSS: Primary Synchronization Signal, the main 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, the main cell group

SCG: Secondary Cell Group, secondary cell group

PCell: Primary Cell, the main cell

SCell: Secondary Cell, secondary 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 Referebee Signals, phase tracking reference signal

TB: Transport Block, transport block

CB: Code Block, coding block/code block

QPSK: Quadrature Phase Shift Keying, quadrature phase shift keying

16/64/256 QAM: 16/64/256 Quadrature Amplitude Modulation, 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 multiplexing multiple access

MAC: Medium Access Control, media access control layer

The following is a description of the prior art associated with the aspects 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 and sidelink involved in the description of the present invention have the same meaning. V2X in the text can also represent sidelink; similarly, sidelink in the text can also represent V2X, and no specific distinction or limitation will be made in the following text.

The resource allocation mode of V2X (sidelink) communication in the specification of the present invention and the transmission mode of V2X (sidelink) communication can be equivalently replaced. The resource allocation method referred to in the specification may represent the transmission mode, and the transmission mode referred to may represent the resource allocation method. 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 PSCCH involved in the description of the present invention corresponds to, or corresponds to, or is related to, or, the scheduled PSSCH indicates the same meaning, and both indicate associated PSSCH or corresponding PSSCH. Similarly, the PSSCH involved in the description corresponds to, or corresponds to, or has the same meaning as the related SCI (including the first-level SCI and the second-level SCI), which means associated SCI or corresponding SCI. It is worth pointing out that the first-level SCI is called 1st stage SCI or SCI format 0-1, and is transmitted in PSCCH; the second-level SCI is called 2nd stage SCI or SCI format 0-2, and is transmitted in the corresponding PSSCH resources .

In the specification of the present invention, a certain time interval may represent the duration of the resource selection window of the sideline communication user equipment. Specifically, if the MAC layer triggers the sensing of the user equipment at time slot n, the resource selection window is [n+T1, n+T2], where the values of T1 and T2 depend on the implementation of the UE. The invention does not make any restrictions on this. The specific time interval includes, but is not limited to, the above description, and can refer to any time interval.

Scenario of Sidelink Communication

1) Out-of-Coverage sideline communication: neither of the two UEs performing sidelink communication has network coverage (for example, the UE cannot detect any cell cell, indicating that the UE has no network coverage).

2) In-Coverage sideline communication: both UEs performing sidelink communication have network coverage (for example, the UE detects at least one cell that satisfies the "cell selection criterion" on the frequency where sidelink communication needs to be performed, 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 UE side, the UE has only two scenarios: no network coverage and network coverage. Part of the network coverage is described in terms of sidelink communication.

Basic process of LTE V2X (sidelink) communication

FIG. 1 is a schematic diagram illustrating sideline communication of an LTE V2X UE. First, UE1 sends sideline communication control information (SCI format 1) to UE2, which is carried by the physical layer channel PSCCH. SCI format 1 contains PSSCH scheduling information, such as PSSCH frequency domain resources. Secondly, UE1 sends sideline communication data to UE2, which is carried by the physical layer channel PSSCH. The PSCCH and the corresponding PSSCH are in a frequency division multiplexing manner, 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 transport 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 the predefined value 510 . SCI format 1 can be carried in PSCCH, wherein SCI format 1 at least includes frequency domain resource information of PSSCH. 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 PSSCH corresponding to the PSCCH.

2) The PSSCH occupies one subframe in the time domain, and adopts frequency division multiplexing (FDM) with the corresponding PSCCH. PSSCH occupies one or more consecutive sub-channels in the frequency domain, sub-channels represent n _subCHsize consecutive RBs in the frequency domain, n _subCHsize is configured by the RRC parameter, the number of starting sub-channels and consecutive 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 respectively called resource allocation based on base station scheduling (Transmission Mode 3) and resource allocation based on UE sensing (Transmission Mode 4). In NR sideline communication, transmission mode 3 of LTE V2X corresponds to transmission mode 1 in NR V2X, which is 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 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 indicates that the frequency domain resources used for 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 the frequency domain resources of PSSCH, and the CRC of the PDCCH or EPDCCH carrying the 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, each configured scheduling grant contains a scheduling grant number (index) and scheduling grants 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 the SPS activation (activate) or release (release, or deactivation). The CRC of the 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 indicates that the UE is configured as a transmission mode based on the 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, the CRC is scrambled with SL-V-RNTI or scrambled with SL-SPS-V-RNTI) ) sends an uplink scheduling grant UL grant to the UE. The above-mentioned uplink scheduling grant UL grant at least includes 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, it uses the PSSCH frequency domain resource indication field in the uplink scheduling grant UL grant (DCI format 5A) as the PSCCH Indication information of the frequency domain resources of PSSCH in (SCI format 1), and send PSCCH (SCI format 1) and the corresponding PSSCH.

For semi-persistently scheduled SPS in transmission mode 3, the UE receives SL-SPS-V-RNTI scrambled DCI format 5A on downlink subframe n. If the indication information of SPS activation is included in the DCI format 5A, the UE determines the frequency domain resources of the PSSCH according to the indication information in the DCI format 5A, and determines the time domain resources of the PSSCH (the transmission subframe of the PSSCH) according to information such as subframe n.

2) Resource allocation method based on UE sensing (Transmission Mode 4): The resource allocation method based on UE sensing indicates that the resources used for sidelink communication are based on the UE 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 the transmission mode based on UE sensing. In the UE sensing-based transmission mode, the base station configures the available transmission resource pool, and the UE determines the PSSCH sidelink transmission resources in the transmission resource pool (resource pool) according to certain rules (see the LTE V2X UE sensing process section for a detailed process description). , and send PSCCH (SCI format 1) and corresponding PSSCH.

Sidelink resource pool

In sideline 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 the sidelink UE 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.

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

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

Table 4.2-1 Subcarrier spacing supported by NR

μμ	Δf＝2 ^μ·15[kHz] Δf=2 ^μ ·15[kHz]	CP(循环前缀)CP (Cyclic Prefix)
00	1515	正常normal
11	3030	正常normal
22	6060	正常，扩展normal, extended
33	120120	正常normal
44	240240	正常normal

Extended CP is supported only when μ=2, that is, in the case of 60 kHz subcarrier spacing, and only normal CP is supported in other subcarrier spacings. For Normal CP, each slot contains 14 OFDM symbols; for Extended CP, each slot contains 12 OFDM symbols. For μ=0, i.e. 15kHz subcarrier spacing, 1 slot=1ms; μ=1, i.e. 30kHz subcarrier spacing, 1 slot=0.5ms; μ=2, i.e. 60kHz subcarrier spacing, 1 slot =0.25ms, and so on.

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

The range is 0 to

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

The range is 0 to

in,

and

The definitions of the cases at different subcarrier spacing μ are 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 an NR carrier, the numbered SFN of a system frame (or, simply referred to as a frame) ranges from 0 to 1023. The concept of direct system frame number DFN is introduced in sideline communication, and the numbering range is also from 0 to 1023. The above description of the relationship between system frames and numerology can also be applied to direct system frames. 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 slots, and so on. DFN is used for timing on sidelink carriers.

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

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

For 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 element RE

The resource block RB is defined in the frequency domain as

consecutive sub-carriers, eg for a sub-carrier spacing of 15 kHz, the RB is 180 kHz in the frequency domain. For a subcarrier spacing of 15 kHz×2 ^μ , the resource element RE represents 1 subcarrier in the frequency domain and 1 OFDM symbol in the time domain.

Time domain pattern pattern of demodulation reference signal DMRS of PSSCH

In NR sideline communication, the OFDM symbols available for sideline communication transmission in a time slot are jointly determined by RRC parameters sl-StartSymbol and sl-LengthSymbols. The value range of sl-StartSymbol is 0 to 7 OFDM symbols, and the value range of sl-LengthSymbols is 7 to 14 OFDM symbols. For example, if sl-StartSymbol is configured as 3, and sl-LengthSymbols is configured as 9, in one slot, OFDM symbol 3 to OFDM symbol 11 can be used for sideline communication transmission.

In the NR sideline communication, the position of the DMRS in a slot is shown in the following table:

Table 1. PSSCH DM-RS time domain location

In the above table, ld represents the number of OFDM symbols for transmitting _PSSCH in the NR sideline communication. It is worth noting that the number of OFDM symbols for transmitting PSSCH includes AGC symbols and does not include gap symbols (Gap symbols). The AGC symbol represents the OFDM symbol corresponding to sl-StartSymbol, and the interval symbol represents the OFDM symbol corresponding to (sl-StartSymbol+sl-LengthSymbols-1) (when the time slot does not contain PSFCH resources). Since _ld does not contain the last symbol available for sideline communication, the value of _ld ranges from 6 to 13. The number in the DM-RS position in the table indicates the relative OFDM number relative to the OFDM symbol corresponding to sl-StartSymbol, that is, the OFDM symbol number corresponding to sl-StartSymbol is 0, and the number 1 indicates that the OFDM symbol corresponding to sl-StartSymbol is after the OFDM symbol. the next OFDM symbol. When the time slot contains PSFCH resources, the PSFCH resources occupy the last three consecutive symbols in the OFDM symbols that can be used for sideline communication transmission in the time slot, that is, symbols (sl-StartSymbol+sl-LengthSymbols-3) to (sl -StartSymbol+sl-LengthSymbols-1). In this case, ld represents the OFDM symbol to symbol (sl-StartSymbol+sl- _{LengthSymbols} -5) corresponding to sl-StartSymbol, and a total of (sl-LengthSymbols-4) symbols.

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

[Example 1]

FIG. 3 is a schematic diagram illustrating a basic process of a method performed by a user equipment according to Embodiment 1 of the present invention.

Hereinafter, the method executed by the user equipment according to Embodiment 1 of the present invention will be described in detail with reference to 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 sideline communication user equipment acquires sideline communication configuration information.

Optionally, the sidelink communication configuration information is sent by the base station gNB through RRC signaling, or the sidelink communication configuration information is included in the preconfiguration information SL-PreconfigurationNR.

Optionally, the sideline communication configuration information at least includes configuration information of the start symbol sl-StartSymbol and the number of symbols sl-LengthSymbols used for sideline communication in one time slot slot.

In step S102, the higher layer (for the physical layer) of the user equipment provides parameters for PSSCH/PSCCH transmission.

Optionally, the resource allocation manner of the user equipment is a resource allocation manner based on user equipment perception.

Optionally, the higher layer is a medium access control MAC layer.

Optionally, the parameter for PSSCH/PSCCH transmission includes at least the number L _subCH of sub-channels used for PSSCH/PSCCH transmission.

In step S103, the user equipment determines (or identifies) candidate resources (candidate resources).

Optionally, a candidate single-slot resource is defined as a slot in the resource pool

and, optionally, the user equipment considers (or assumes, assume) that (any one of the time _slots included in the resource pool) within a certain time interval in) any set of the L _subCH consecutive subchannels corresponds to a single-slot candidate resource, and, optionally, except when the sl-LengthSymbols is less than or equal to 9, when the sl-LengthSymbols is less than or equal to 9, the The corresponding single-slot candidate resource on the time slot of the PSFCH resource of the feedback channel (that is, when the sl-LengthSymbols is less than or equal to 9, the user equipment considers that any time slot on the time slot including the PSFCH resource of the PSFCH a set of L _subCH consecutive sub-channels does not correspond to a single-slot candidate resource),

or,

The set of the L _subCH consecutive sub-channels on the

It does not contain the resources of the physical sideline communication feedback channel PSFCH. And, optionally, the user equipment considers (or assumes, assume) that within a certain time interval, any set of the L _subCH consecutive sub-channels included in the resource pool (in any one time slot) are all Corresponds to a single-slot candidate resource.

[Example 2]

FIG. 3 is a schematic diagram illustrating a basic process of a method executed by a user equipment according to Embodiment 2 of the present invention.

Hereinafter, the method executed by the user equipment according to Embodiment 2 of the present invention will be described in detail with reference to 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:

Optionally, the higher layer is a medium access control MAC layer.

the set of the L _subCH consecutive subchannels on , and, optionally, the time slot

The corresponding number of PSSCH transmission symbols 1 _d (duration for transmission of PSSCH) is greater than or equal to 6; optionally, the user equipment considers (or assumes, assume) that ( In any time slot) any set of the L _subCH continuous sub-channels corresponds to a single-slot candidate resource,

or,

The set of the L _subCH consecutive sub-channels on the L subCH; optionally, the user equipment considers (or assumes, assume) the sub-channels included in the resource pool (in any time slot) within a certain time interval Any set of the L _subCH consecutive sub-channels corresponds to a single-slot candidate resource, and, optionally, removes the single-slot candidate resource on the timeslot corresponding to the PSSCH transmission symbol number 1 _d is less than 6 (that is, all the The user equipment considers that any set of the L _subCH consecutive subchannels on the time slot where the number of PSSCH transmission symbols 1 _d (duration for transmission of PSSCH) is less than 6 does not correspond to a single-slot candidate resource).

[Example 3]

FIG. 3 is a schematic diagram illustrating a basic process of a method performed by a user equipment according to Embodiment 3 of the present invention.

Hereinafter, the method executed by the user equipment according to Embodiment 3 of the present invention will be described in detail with reference to 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:

Optionally, the resource allocation mode of the user equipment is a resource allocation mode based on user equipment perception.

Optionally, the higher layer is a medium access control MAC layer.

The time-domain pattern of the DMRS corresponding to one or more PSSCHs; optionally, the user equipment considers (or assumes, assume) that within a certain time interval, any (in any time slot) contained in the resource pool The set of L _subCH consecutive subchannels all correspond to a single-slot candidate resource,

or,

The set of the L _subCH consecutive sub-channels on the L subCH; optionally, the user equipment considers (or assumes, assume) the sub-channels included in the resource pool (in any time slot) within a certain time interval Any set of the L _subCH consecutive subchannels corresponds to a single-slot candidate resource, and, optionally, a single-slot candidate resource ( That is, the user equipment considers that any set of the L _subCH consecutive subchannels on the time slot of the time domain pattern of the DMRS that does not correspond to one or more PSSCHs does not correspond to a single-slot candidate resource).

[Example 4]

FIG. 4 is a schematic diagram illustrating a basic process of a method performed by a user equipment according to Embodiment 4 of the present invention.

Hereinafter, the method executed by the user equipment according to Embodiment 4 of the present invention will be described in detail with reference to the basic process diagram shown in FIG. 4 .

As shown in FIG. 4 , in Embodiment 4 of the present invention, the steps performed by the user equipment include:

In step S201, the sideline communication user equipment acquires sideline communication configuration information.

In step S202, the higher layer (for the physical layer) of the user equipment provides parameters for PSSCH/PSCCH transmission.

Optionally, the higher layer is a medium access control MAC layer.

In step S203, if a candidate resource meets one (or more) of the following conditions, the user equipment excludes the candidate resource from the candidate resource set _SA :

Optionally, when the sl-LengthSymbols is less than or equal to 9, the time slot where the candidate resource is located includes the physical sideline communication feedback channel PSFCH resource; or,

The number of symbols 1 _d (duration for transmission of PSSCH) corresponding to PSSCH transmission in the time slot where the candidate resource is located is less than 6; or,

■ The time slot in which the candidate resource is located does not correspond to the time domain pattern of the DMRS of one or more PSSCHs.

In step S204, optionally, the user equipment reports the (excluded) candidate resource set _SA to the higher layer.

[Example 5]

FIG. 5 is a schematic diagram illustrating a basic process of a method performed by a user equipment according to Embodiment 5 of the present invention.

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

As shown in FIG. 5 , in Embodiment 5 of the present invention, the steps performed by the user equipment include:

In step S301, the sideline communication user equipment acquires sideline communication configuration information.

In step S302, the higher layer (the physical layer) of the user equipment provides parameters for PSSCH/PSCCH transmission.

Optionally, the higher layer is a medium access control MAC layer.

In step S303, the user equipment reports the (excluded) candidate resource set _SA to the higher layer.

In step S304, the upper layer of the user equipment selects resources for PSSCH/PSCCH transmission.

Optionally, the higher layer of the user equipment randomly selects resources for PSSCH/PSCCH transmission after excluding resources meeting any of the following conditions from the reported candidate resource set.

■ When the sl-LengthSymbols is less than or equal to 9, the time slot where the resource is located includes the physical sideline communication feedback channel PSFCH resource; or,

The number of symbols 1 _d (duration for transmission of PSSCH) corresponding to PSSCH transmission in the time slot where the resource is located is less than 6; or,

■The time slot in which the resource is located does not correspond to the time domain pattern of the DMRS of one or more PSSCHs.

FIG. 6 is a block diagram showing a user equipment UE according to the present invention. As shown in FIG. 6 , 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, or the like. The memory 802 may include, for example, volatile memory (eg, random access memory RAM), a hard disk drive (HDD), non-volatile memory (eg, flash memory), or other memory, or the like. Program instructions are stored on the memory 802 . When the instructions are executed by the processor 801, the above-mentioned method performed by the user equipment described in detail in the present invention can be executed.

The method of the present invention and the apparatus involved have been described above with reference to the preferred embodiments. Those skilled in the art can understand that the methods shown above are only exemplary, and the various embodiments described above can be combined with each other under the condition that no contradiction occurs. The method of the present invention is not limited to the steps and sequences 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 a base station, an MME, or a UE, and so on. The various identifiers shown above are only exemplary and not restrictive, and the present invention is not limited to the specific information elements exemplified by these identifiers. Numerous changes 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 may be implemented by software, hardware, or a combination of both. For example, the various components inside the base station and the user equipment in the above embodiments may be implemented by various devices, including but not limited to: analog circuit devices, digital circuit devices, digital signal processing (DSP) circuits, programmable processing Controllers, 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 larger transmission power and wider coverage area, including functions such as resource allocation and scheduling, data reception and transmission, and the like. "User equipment" may refer to a user mobile terminal, for example, including a mobile phone, a notebook, and other terminal equipment that can 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 a product having a computer-readable medium on which computer program logic is encoded that, when executed on a computing device, provides relevant operations to achieve The above technical solutions of the present invention. When executed on at least one processor of a computing system, computer program logic causes the processor to perform the operations (methods) described in the embodiments of the present invention. Such arrangements of the present 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 (eg CD-ROM), floppy or hard disk, or such as one or more Firmware or other medium of 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 a configuration may be installed on a computing device, so that one or more processors in the computing device execute the technical solutions described in the embodiments of the present invention.

In addition, each functional module or each feature of the base station device and the terminal device used in each of the above embodiments may be implemented or executed by a circuit, which is usually 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 Program logic devices, discrete gate or transistor logic, or discrete hardware components, or any combination of the above. 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 digital circuits, or may be configured by logic circuits. In addition, when an advanced technology that can replace the current integrated circuit appears due to the advancement of semiconductor technology, the present invention can also use the integrated circuit obtained by using the advanced technology.

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

Claims

A method performed by a user equipment, comprising:

Obtain sideline communication configuration information;

Higher layers provide parameters for PSSCH/PSCCH transmission;

Identify or identify candidate resources.
The method of claim 1, wherein:

The sideline communication configuration information is sent by the base station gNB through RRC signaling; or

The sideline communication configuration information is included in the preconfiguration information SL-PreconfigurationNR.
The method of claim 2, wherein:

The sideline communication configuration information at least includes configuration information of the start symbol sl-StartSymbol and the number of symbols sl-LengthSymbols used for sideline communication in a time slot slot.
The method of claim 3, wherein:

The resource allocation method of the user equipment is a resource allocation method based on the perception of the user equipment; and/or

The higher layer is the medium access control MAC layer.
The method of claim 4, wherein:

The parameters for PSSCH/PSCCH transmission include at least the number L subCH of sub-channels used for PSSCH/PSCCH transmission.
The method of claim 5, wherein:

A single slot candidate resource is defined as a slot in the resource pool
the set of said L subCH consecutive sub-channels on; and/or

The user equipment considers or assumes that within a certain time interval, any set of the L subCH consecutive subchannels included in the resource pool corresponds to the one single-slot candidate resource.
The method of claim 6, wherein:

From the candidate resource, when the sl-LengthSymbols is less than or equal to 9, the one-slot candidate resource corresponding to the time slot including the PSFCH resource of the physical sideline communication feedback channel is excluded.
The method of claim 6, wherein:

the time slot
The corresponding PSSCH transmission symbol number 1 d is greater than or equal to 6; and/or

The one single-slot candidate resource on the time slot corresponding to the PSSCH transmission symbol number 1 d is less than 6 is removed.
The method of claim 6, wherein:

the time slot
a time-domain pattern of DMRS corresponding to one or more PSSCHs; and/or

The one single-slot candidate resource on the time-domain pattern of the DMRS whose time slot does not correspond to one or more PSSCHs is removed.
A user equipment comprising:

processor; and

memory, storing instructions;

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