WO2022143641A1 - Method executed by user equipment, and user equipment - Google Patents

Abstract

The present invention provides a method executed by user equipment, and user equipment. The method comprises: providing transmission parameters of a physical sidelink communication shared channel (PSSCH) and a physical sidelink communication control channel (PSCCH) on an upper layer of user equipment; determining a first set of time slots by the user equipment; and determining a set of listening time slots by the user equipment.

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.

In resource allocation mode 2, re-evaluation of the transmission resources selected by the upper layer is supported, that is, before the time when the transmission resources are located, the selected transmission resources are re-sensed to judge the transmission resources. Whether the resource is still available.

At the 3GPP RAN#90 plenary meeting in December 2020, the Rel-17 research topic of NR sidelink enhancement based on 5G NR network technology (see Non-Patent Document 6) was approved.

The research goals of enhanced NR sideline communication mainly include two aspects:

1) Reduce the power saving of user equipment; for example, with random resource selection and partial sensing in Rel-14 LTE sideline communication as the design baseline, the research is based on the Rel-16NR side A resource allocation method that reduces power consumption for line communication.

2) Enhance the reliability of sideline communication and reduce communication delay; for example, introduce inter-UE coordination between user equipments to enhance transmission reliability.

In the 3GPP RAN1#103 meeting in November 2020, regarding the resource allocation method of partial perception, there are the following conclusions of the meeting (see Non-Patent Document 7):

1) In the Rel-17 enhanced sideline communication, the resource allocation method based on partial sensing is supported;

2) In the Rel-17 enhanced sideline communication, the user equipment supporting the partial aware resource allocation method performs re-evaluation (re-evaluation) on the transmission resources selected by the upper layer.

The solution of the present patent mainly includes a method for determining the set of listening time slots by the sidelink communication user equipment when the resource allocation mode of the sidelink communication user equipment is partial sensing.

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

Non-Patent Document 6: RP-202846, WID revision: NR sidelink enhancement

Non-Patent Document 7: RAN1#103e Minutes report, section 8.11.2.1

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: the upper layer of the user equipment provides transmission parameters of the physical sidelink communication shared channel PSSCH and the physical sidelink communication control channel PSCCH; the user equipment determines the first A set of time slots; the user equipment determines a set of listening time slots.

According to the method of the first aspect of the present invention, the process of providing the transmission parameters of the physical sideline communication shared channel PSSCH and the physical sideline communication control channel PSCCH by the upper layer of the user equipment further includes: the upper layer providing the transmission parameters in the time slot n. transmission parameters of the PSSCH and the PSCCH; and/or a process for triggering partial sensing.

According to the method of the first aspect of the present invention, the upper layer provides a first resource set and/or a second resource set, the first resource set is subordinate to the re-evaluated resources, and the second resource set is subordinate to the preempted resources .

According to the method of the first aspect of the present invention, the user equipment determines the first set of time slots within a time interval.

According to the method of the first aspect of the present invention, the first time slot set includes at least time slots corresponding to the first resource set and/or the second resource set.

According to the method of the first aspect of the present invention, the resource allocation manner of the user equipment is based on the partially perceived resource allocation manner.

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

Corresponding to the time slot slot n, wherein r _i " represents the time slot with the smallest, or the earliest, or the first time slot number in the first resource set and/or the second resource set;

Indicates the first processing delay.

According to the method of the first aspect of the present invention, the set of listening time slots at least includes: slave time slots

to the slot n or slot

one or more time slots in , where,

represents the second processing delay; time slot

Indicates the last time slot or the first time slot in the first time slot set, or any time slot in the first time slot set, or the first resource set and/or the first time slot set 2. The time slot with the largest or the last time slot number in the resource set; P _interval is a configured or pre-configured time domain interval parameter, or, a predefined time domain interval, or, the minimum, or Any resource reservation period, or, is determined by all or part of the resource reservation period in the resource pool configuration information.

According to the method of the first aspect of the present invention, the set of listening time slots at least includes: slave time slots

to the slot n or slot

one or more time slots in , where,

represents the second processing delay; time slot

Indicates the last time slot or the first time slot in the first time slot set, or any time slot in the first time slot set, or the first resource set and/or the first time slot set 2. The time slot with the largest or the last time slot number in the resource set; P _interval is a configured or pre-configured time domain interval parameter, or, a predefined time domain interval, or, the minimum, or Any resource reservation period, or, is determined by all or part of the resource reservation periods in the resource pool configuration information; k is determined by a configured or pre-configured bitmap.

User equipment according to a second aspect of the present invention, comprising: a processor; and a memory storing instructions; wherein the instructions, when executed by the processor, perform any of the methods according to the first aspect above.

The beneficial effects of the present invention

According to the solution of the present patent, in the enhanced sideline communication, for the resource allocation method based on the partial perception of the user equipment, the solution of the present invention can ensure that the user equipment of the sideline communication can effectively re-evaluate the resources selected by the upper layer. It can ensure that the transmission energy consumption is reduced, and at the same time, the transmission reliability of the sideline communication is improved.

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 and second embodiments 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 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 Reference 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 mentioned 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), and both represent 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 .

The upper layers involved in the specification of the present invention include, but are not limited to, the medium access control layer, the MAC layer.

For the time slot slot a to the time slot slot b involved in the description of the present invention, the time slot slot a may contain the slot a itself, or not contain the slot a itself (that is, start from the next slot of the slot a); Slot b may contain slot b itself, or it may not contain slot itself (i.e. start counting from the previous slot of slot b).

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 frequency-division multiplexed, that is, the PSCCH and the corresponding PSSCH are located on the same subframe in the time domain, and are located on different 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 NR (including NR sidelink) slot

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

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

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 (Normal) CP, each slot (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 subffame

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 and includes two slots, each of which 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.

NR sideline communication resource allocation method 2 and resource re-evaluation (re-evaluation)

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.

In resource allocation mode 2, re-evaluation of the transmission resources selected by the upper layer is supported, that is, before the time when the transmission resources are located, the selected transmission resources are re-sensed to judge the transmission resources. Whether the resource is still available.

Processing Delay of Resource Allocation Mode 2 in NR Sidelink Communication

There are at least two processing delays involved in the description of the present invention:

and

and

The value of is as follows, where _μSL represents the information of the subcarrier spacing of the sideline communication.

Table 1:

value of

Table 2:

value of

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 upper layer (or, the upper layer) (the physical layer) of the sideline communication user equipment provides transmission parameters of the physical sideline communication shared channel PSSCH and the physical sideline communication control channel PSCCH.

Wherein, optionally, in the process of providing the transmission parameters of PSSCH and PSCCH in the upper layer (or, the upper layer) (for the physical layer) of the sideline communication user equipment, it also includes: Physical layer) provides transmission parameters of the PSSCH and the PSCCH; and, optionally, a process for triggering partial sensing.

Optionally, the upper layer provides the first resource set (r ₀ , r ₁ , r ₂ , . . . ) and/or the second resource set (r ₀ ′, r ₁ ′, r ₂ ′, . . . ). wherein the first resource set is subject to re-evaluation resources; the second resource set is subject to pre-emption resources, and, optionally, r _i ″ Indicates the slot with the smallest (or, the earliest, or the first) slot index in the first resource set and/or the second resource set.

Optionally, time slot

corresponds to the time slot slot n.

In step S102, the sideline communication user equipment determines a first time slot set.

Optionally, the user equipment determines the first time slot set within a time interval (time interval)

Optionally, the first time slot set corresponds to a time slot set of candidate resources.

Optionally, the first time slot set includes at least time slots corresponding to the first resource set and/or the second resource set.

In step S103, optionally, the sideline communication user equipment determines a set of listening time slots.

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

Optionally, in the set of listening time slots determined by the user equipment, the method further includes: the set of listening time slots at least includes slave time slots

to the time slot n (or, time slot

) in one or more time slots. Among them, the time slot

Indicates the last time slot in the first time slot set, or the first time slot, or any time slot in the first time slot set, or the first resource set and/or all The time slot with the largest (or, last) time slot number in the second resource set; P _interval is a configured or pre-configured time domain interval parameter, or, a predefined time domain interval (for example, 20ms, 100ms, etc.), Or, the minimum (or, any one) resource reservation period included in the resource pool configuration information, or, determined by all (or, part) resource reservation periods in the resource pool configuration information, for example, all or part of the resource reservation The greatest common divisor of the period, the present invention does not make any limitation on P _interval . Wherein, optionally, the one or more time slots may be all consecutive time slots in the resource pool, or may be slave time slots

The starting 32 consecutive resource pool time slots, or, the slave time slot

to the time slot n (or, time slot

) in the set of listening slots depends on the implementation of the user equipment. Optionally, the set of listening time slots does not include (or excludes except for) time slots used by the user equipment for sideline communication transmission.

[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:

In step S101, the upper layer (or, the upper layer) (the physical layer) of the sideline communication user equipment provides transmission parameters of the physical sideline communication shared channel PSSCH and the physical sideline communication control channel PSCCH.

Wherein, optionally, in the process of providing the transmission parameters of PSSCH and PSCCH in the upper layer (or, the upper layer) (for the physical layer) of the sideline communication user equipment, it also includes: Physical layer) provides transmission parameters of the PSSCH and the PSCCH; and, optionally, a process for triggering partial sensing.

Optionally, the upper layer provides the first resource set (r ₀ , r ₁ , r ₂ , . . . ) and/or the second resource set (r ₀ ′, r ₁ ′, r ₂ ′, . . . ). wherein the first resource set is subject to re-evaluation resources; the second resource set is subject to pre-emption resources, and, optionally, r _i ″ Indicates the slot with the smallest (or, the earliest, or the first) slot index in the first resource set and/or the second resource set.

Optionally, time slot

corresponds to the time slot slot n.

In step S102, the sideline communication user equipment determines a first time slot set.

Optionally, the user equipment determines the first time slot set within a time interval (time interval)

Optionally, the first time slot set corresponds to a time slot set of candidate resources.

Optionally, the first time slot set includes at least time slots corresponding to the first resource set and/or the second resource set.

In step S103, optionally, the sideline communication user equipment determines a set of listening time slots.

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

Optionally, in the set of listening time slots determined by the user equipment, the method further includes: the set of listening time slots at least includes slave time slots

to the time slot n (or, time slot

) in one or more time slots. Among them, the time slot

Indicates the last time slot in the first time slot set, or the first time slot, or any time slot in the first time slot set, or the first resource set and/or all P interval is the time slot with the largest (or, last) time slot number in the second resource set; P _interval is a configured or pre-configured time domain interval parameter, or, a predefined time domain interval (for example, 20ms, 100ms, etc.), Or, the minimum (or, any one) resource reservation period included in the resource pool configuration information, or, determined by all (or, part) resource reservation periods in the resource pool configuration information, for example, all or part of the resource reservation The greatest common divisor of the period, the present invention does not make any limitation on p _interval . Wherein, optionally, the one or more time slots may be all consecutive time slots in the resource pool, or may be slave time slots

The starting 32 consecutive resource pool time slots, or, the slave time slot

to the time slot n (or, time slot

) in the set of listening slots depends on the implementation of the user equipment. Optionally, the set of listening time slots does not include (or excludes except for) time slots used by the user equipment for sideline communication transmission. Wherein, k is determined by the configured (or pre-configured) bitmap bitmap. Optionally, the first bit set to 1 (or 0) in the bitmap bitmap is the kth bit.

[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:

In step S101, the upper layer (or, the upper layer) (the physical layer) of the sideline communication user equipment provides transmission parameters of the physical sideline communication shared channel PSSCH and the physical sideline communication control channel PSCCH.

Wherein, optionally, in the process of providing the transmission parameters of PSSCH and PSCCH in the upper layer (or, the upper layer) (for the physical layer) of the sideline communication user equipment, it also includes: physical layer) provides transmission parameters of the PSSCH and the PSCCH.

Optionally, the upper layer provides the first resource set (r ₀ , r ₁ , r ₂ , . . . ) and/or the second resource set (r ₀ ′, r ₁ ′, r ₂ ′, . . . ). wherein the first resource set is subject to re-evaluation resources; the second resource set is subject to pre-emption resources, and, optionally, r _i ″ Indicates the slot with the smallest (or, the earliest, or the first) slot index in the first resource set and/or the second resource set.

Optionally, the candidate resources reported by the user equipment to the upper layer during the (initial) partial sensing process of the time slot slot n trigger (trigger) at least include the first resource set and/or the second resource set, or, the first resource set and/or the second resource set belong to: after the part of the user equipment triggered on the time slot slot n obtains the candidate resource set and reports it to the upper layer, (may be Optionally, the sideline communication scheduling selected by the upper layer grants resources).

In step S102, the sideline communication user equipment determines a first time slot set.

Optionally, the user equipment determines the first time slot set within a time interval (time interval)

Optionally, the first time slot set corresponds to a time slot set of candidate resources.

In step S103, optionally, the sideline communication user equipment determines a set of listening time slots.

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

Optionally, when the user equipment determines the set of listening time slots, it further includes: the set of listening time slots at least includes the time slot from slot n to the time slot.

(or, time slot

) in one or more time slots. Wherein, optionally, the one or more timeslots may be all consecutive timeslots in the resource pool, or may be 32 consecutive timeslots of the resource pool starting from the timeslot n, or the timeslots from all the time slot slot n to the time slot

(or, time slot

) in the set of listening slots depends on the implementation of the user equipment. Optionally, the set of listening time slots does not include (or excludes except for) time slots used by the user equipment for sideline communication transmission.

[Example 4]

FIG. 3 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. 3 .

As shown in FIG. 3, in Embodiment 4 of the present invention, the steps performed by the user equipment include:

In step S101, the upper layer (or, the upper layer) (the physical layer) of the sideline communication user equipment provides transmission parameters of the physical sideline communication shared channel PSSCH and the physical sideline communication control channel PSCCH.

Wherein, optionally, in the process of providing the transmission parameters of PSSCH and PSCCH in the upper layer (or, the upper layer) (for the physical layer) of the sideline communication user equipment, it also includes: physical layer) provides transmission parameters of the PSSCH and the PSCCH.

Optionally, the upper layer provides the first resource set (r ₀ , r ₁ , r ₂ , . . . ) and/or the second resource set (r ₀ ′, r ₁ ′, r ₂ ′, . . . ). wherein the first resource set is subject to re-evaluation resources; the second resource set is subject to pre-emption resources, and, optionally, r _i ″ Indicates the slot with the smallest (or, the earliest, or the first) slot index in the first resource set and/or the second resource set.

Optionally, the candidate resources reported by the user equipment to the upper layer during the (initial) partial sensing process of the time slot slot n trigger (trigger) at least include the first resource set and/or the second resource set, or, the first resource set and/or the second resource set belong to: after the part of the user equipment triggered on the time slot slot n obtains the candidate resource set and reports it to the upper layer, (may be Optionally, the sideline communication scheduling selected by the upper layer grants resources).

Optionally, the time slot where the upper layer provides the first resource set and/or the second resource set is time slot p.

Optionally, the upper layer provides selected sidelink resources/grants. And, optionally, gi represents the slot with the smallest (or, the earliest, or the first) slot index in the sidelink communication resource/grant.

Optionally, the time slot where the upper layer provides the sidelink communication resource/license is time slot g.

In step S102, the sideline communication user equipment determines a first time slot set.

Optionally, the user equipment determines the first time slot set within a time interval (time interval)

Optionally, the first time slot set corresponds to a time slot set of candidate resources.

In step S103, optionally, the sideline communication user equipment determines a set of listening time slots.

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

Optionally, in the set of monitoring time slots determined by the user equipment, the method further includes: the set of monitoring time slots at least includes the time slot from the time slot p to the time slot.

(or, time slot

) in one or more time slots. Wherein, optionally, the one or more time slots may be all consecutive time slots in the resource pool, or may be 32 consecutive resource pool time slots starting from the time slot p, or the the time slot slot p to the time slot

(or, time slot

) in the set of listening slots depends on the implementation of the user equipment. Optionally, the set of monitoring time slots does not include (or, except for) the time slots used by the user equipment for sideline communication transmission,

or,

Optionally, in the set of monitoring time slots determined by the user equipment, it further includes: the set of monitoring time slots at least includes the time slot from slot g to the time slot.

(or, time slot

) in one or more time slots. Wherein, optionally, the one or more timeslots may be all consecutive timeslots in the resource pool, or may be 32 consecutive timeslots of the resource pool starting from the timeslot g, or, the timeslots from all from slot g to slot

(or, time slot

) in the set of listening slots depends on the implementation of the user equipment. Optionally, the set of listening time slots does not include (or excludes except for) time slots used by the user equipment for sideline communication transmission.

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, 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. The memory 802 has program instructions stored thereon. When the instructions are executed by the processor 801, the above method described in detail in the present invention and executed by the user equipment can be executed.

The method and related apparatus of the present invention 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 (10)

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

   The upper layer of the user equipment provides transmission parameters of the physical sideline communication shared channel PSSCH and the physical sideline communication control channel PSCCH;

   determining, by the user equipment, a first set of time slots;

   The user equipment determines a set of listening time slots.
2. The method of claim 1, wherein:

   The process in which the upper layer of the user equipment provides the transmission parameters of the physical sideline communication shared channel PSSCH and the physical sideline communication control channel PSCCH, further comprising:

   the upper layer provides transmission parameters of the PSSCH and the PSCCH at time slot n; and/or

   The process used to trigger partial perception.
3. The method of claim 2, wherein:

   the upper layer provides the first resource set and/or the second resource set,

   the first set of resources is subordinate to the re-evaluated resources,

   The second resource set is subordinate to preempted resources.
4. The method of claim 1, wherein:

   The user equipment determines the first set of time slots within a time interval.
5. The method of claim 3, wherein:

   The first time slot set includes at least time slots corresponding to the first resource set and/or the second resource set.
6. The method of claim 2, wherein:

   The resource allocation manner of the user equipment is based on the partially perceived resource allocation manner.
7. The method of claim 3, wherein:

   time slot

   

   Corresponding to the time slot slot n,

   in,

   r _i "represents the time slot with the smallest, or the earliest, or the first time slot number in the first resource set and/or the second resource set;

   

   Indicates the first processing delay.
8. The method of claim 3, wherein:

   The set of listening time slots includes at least:

   from time slot

   

   to the slot n or slot

   

   one or more time slots in ,

   in,

   

   represents the second processing delay;

   time slot

   

   Indicates the last time slot or the first time slot in the first time slot set, or any time slot in the first time slot set, or the first resource set and/or the first time slot set 2. The time slot with the largest or the last time slot number in the resource set;

   P _interval is a configured or pre-configured time domain interval parameter, or, a predefined time domain interval, or, the minimum or any resource reservation period included in the resource pool configuration information, or, by all the resource pool configuration information , or a part of the resource reservation period.
9. The method of claim 3, wherein:

   The set of listening time slots includes at least:

   from time slot

   

   to the slot n or slot

   

   one or more time slots in ,

   in,

   

   represents the second processing delay;

   time slot

   

   Indicates the last time slot or the first time slot in the first time slot set, or any time slot in the first time slot set, or the first resource set and/or the first time slot set 2. The time slot with the largest or the last time slot number in the resource set;

   P _interval is a configured or pre-configured time domain interval parameter, or, a predefined time domain interval, or, the minimum or any resource reservation period included in the resource pool configuration information, or, by all the resource pool configuration information , or determined by part of the resource reservation period;

   k is determined by a configured or preconfigured bitmap.
10. 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.

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