CN116887436A

CN116887436A - Method performed by user equipment and user equipment

Info

Publication number: CN116887436A
Application number: CN202210315630.2A
Authority: CN
Inventors: 赵毅男; 罗超; 刘仁茂
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2022-03-28
Filing date: 2022-03-28
Publication date: 2023-10-13
Also published as: WO2023185688A1

Abstract

The application provides a method executed by user equipment and the user equipment, wherein the method comprises the following steps: requesting or triggering the user equipment by a higher layer to determine a resource subset used for PSSCH/PSCCH transmission, wherein the higher layer selects side row communication resources used for the PSSCH/PSCCH transmission in the resource subset; the user equipment determines a candidate time slot set; and the user equipment determining a set of listening slots.

Description

Method performed by user equipment and user equipment

Technical Field

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

Background

In a conventional cellular network, all communications must pass through a base station. In contrast, D2D communication (Device-to-Device communication, device-to-Device direct communication) refers to a communication method in which two user equipments directly perform communication without being forwarded by a base station or a core network. On the RAN #63 full-meeting of the third generation partnership project (3rd Generation Partnership Project,3GPP) in 2014, a study subject about the realization of near D2D communication services using LTE devices is approved (see non-patent document 1). The functions introduced by LTE Release 12 d2d include:

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

2) A direct Broadcast communication (Broadcast) function between nearby devices;

3) The higher layers support Unicast (Unicast) and multicast (Groupcast) communication functions.

In the 3gpp ran#66 group of 12 of 2014, a research project of enhanced LTE eD2D (enhanced D2D) is approved (see non-patent document 2). The main functions introduced by LTE Release 13 e d2d include:

1) D2D discovery of network-free and partial network coverage scenes;

2) Priority handling mechanism for D2D communication.

The V2X feasibility study subject by D2D communication was approved on the RAN #68 meeting of 3GPP at 6 months in 2015 based on the design of D2D communication mechanism. V2X represents Vehicle to everything for the purpose of enabling the interaction of a vehicle with all physical information that may affect the vehicle in order to reduce incidents, alleviate traffic congestion, reduce environmental pollution and provide other information services. The application scenario of V2X mainly includes 4 aspects:

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

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

3) V2N, vehicle to Network, i.e. the vehicle is connected to a mobile network;

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

The 3GPP divides V2X research and standardization work into 3 phases. The first stage was completed in 2016, 9, and mainly focused on V2V, and was formulated based on LTE Release 12 and Release 13 d2d (also referred to as sidelink side communication), that is, proximity communication technology (see non-patent document 3). V2X stage 1 introduces a new D2D communication interface, called PC5 interface. The PC5 interface is mainly used for solving the communication problem of the cellular Internet of vehicles in a high-speed (up to 250 km/h) and high-node-density environment. The vehicles can interact with information such as position, speed and direction through the PC5 interface, i.e. the vehicles can communicate directly with each other through the PC5 interface. In comparison with proximity communication between D2D devices, LTE Release 14 v2x introduced functions mainly include:

1) Higher density DMRS to support high speed scenarios;

2) Introducing a sub-channel (sub-channel), and enhancing a resource allocation mode;

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

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

The corresponding third stage was approved based on the V2X feasibility study topic of 5G NR network technology (see non-patent document 5) at the 3gpp ran#80 corpus at 6 of 2018.

In the 5g NR v2x problem, a resource allocation method 2 (resource allocation mode 2) based on user equipment awareness (sensing) is supported, or referred to as transmission mode 2. In resource allocation mode2, the physical layer of the ue perceives the transmission resources in the resource pool and reports the set of available transmission resources to the upper layer. The upper layer, after obtaining the report of the physical layer, selects resources for sidestream communication transmission.

On the whole of 3gpp ran#90e at 12 months in 2020, a standardization research topic (see non-patent document 6) based on enhancement of NR sidestream communication (NR sidelink enhancement) which has been standardized is approved. The enhancement of sidestream communication includes the following two aspects:

1) Standardized resource allocation approaches to reduce power consumption (power save) of sidestream communication user devices, including but not limited to: based on a part of perceived resource allocation mode (partial serving), a resource allocation mode selected based on random resources;

2) And (3) researching improvement of the communication reliability of the resource allocation mode2 in NR side-row communication and reduction of the communication time delay of the resource allocation mode 2.

In the above-mentioned resource allocation method 2 based on user equipment perception, the physical layer of the user equipment perceives the transmission resources in the resource pool, which means that the user equipment excludes (include) the resources overlapping with the resources indicated by the indication information in the candidate resource set according to the received indication information in the SCI sent by other user equipment, and the non-excluded resources in the candidate resource set are reported to the higher layer.

The scheme of the patent mainly comprises a method for determining the monitoring (sensing) time slot by the side communication user equipment in a resource allocation mode based on 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 document 3: RP-152293,New WI proposal: support for V2V services based on LTE sidelink

Non-patent document 4: RP-170798,New WID on 3GPP V2X Phase 2

Non-patent document 5: RP-181480,New SID Proposal: studion NR V2X

Non-patent document 6: RP-202846,WID revision: NR sidelink enhancement

Disclosure of Invention

To solve at least some of the above problems, the present application provides a method performed by a user equipment and the user equipment.

A method performed by a user equipment according to the first aspect of the application comprises: requesting or triggering the user equipment by a higher layer to determine a resource subset used for PSSCH/PSCCH transmission, wherein the higher layer selects side row communication resources used for the PSSCH/PSCCH transmission in the resource subset; the user equipment determines a candidate time slot set; and the user equipment determining a set of listening slots.

According to the method of the first aspect of the present application, the user equipment performs period-based partial awareness, condition one, if at least the following condition is satisfied: the higher layer configures the resource allocation mode of the user equipment to be a resource allocation mode based on the partial perception; and/or condition two: periodically reserving a resource configuration or pre-configuring to be enabled for another transmission block in a resource pool; and/or condition three: the resource pool configuration or the pre-configured resource allocation mode comprises a resource allocation mode based on the partial perception.

According to the method of the first aspect of the application, the manner in which the user equipment determines the set of candidate time slots is dependent on the implementation of the user equipment.

According to the method of the first aspect of the present application, in case the user equipment performs the period-based partial awareness, the user equipment listening slot set isWherein (1)>Representing any time slot in the candidate time slot set, for P _reserve P when the resource pool is configured with a monitoring period list _reserve Corresponding to a period or a non-zero period in the listening period list; otherwise, P _reserve Corresponding to all periods or all non-zero periods in a list of resource reservation periods configured in the resource pool, for k, if no additional periodic listening slots are configured or pre-configured,/for k>Representing that corresponds to a given P _reserve At the moment +.>The last previous periodic listening slot; otherwise, go (L)>Representing that corresponds to a given P _reserve At the moment ofA previous most recent periodic listening slot and a last periodic listening slot preceding the most recent periodic listening slot, wherein ∈r>Representing the first time slot in the time domain in the candidate set of time slots,representing a first processing delay,/->Representing a second processing delay.

According to the method of the first aspect of the present application, in case the user equipment performs the period-based partial awareness, the user equipment listening slot set isWherein (1)>Represents any slot in the set of candidate slots, and (2)> Wherein T' _max Representing the number of time slots belonging to said resource pool within 10240ms for P _reserve P when the resource pool is configured with a monitoring period list _reserve Corresponding to a period or a non-zero period in the listening period list; otherwise, P _reserve Corresponding to all periods or all non-zero periods in a list of resource reservation periods configured in the resource pool, for k, if no additional periodic listening slots are configured or pre-configured,/for k>Representing that corresponds to a given P _reserve At the moment +.>The last previous periodic listening slot; otherwise, go (L)>Representing that corresponds to a given P _reserve At the moment ofA previous most recent periodic listening slot and a last periodic listening slot preceding the most recent periodic listening slot, wherein ∈r>Representing the first time slot in the time domain in the candidate set of time slots,representing a first processing delay,/->Representing a second processing delay.

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

The beneficial effects of the application are that

According to the scheme of the patent, in NR sidestream communication enhancement, for a resource allocation mode based on partial perception, a monitoring time slot set determined by user equipment does not contain a candidate time slot set, so that the situation that the time slot set cannot become the candidate time slot set due to half duplex limitation is avoided, and the reliability of sidestream communication is improved.

Drawings

The foregoing and other features of the application will become more apparent from the following detailed description, taken in conjunction with the accompanying drawings in which:

fig. 1 is a schematic diagram illustrating LTE V2X UE side-by-side communication.

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

Fig. 3 is a schematic diagram showing a basic procedure of a method performed by a user equipment in the first and second embodiments of the application.

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

Detailed Description

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

Various embodiments in accordance with the present application are described in detail below with respect to an example application environment for a 5G mobile communication system and its subsequent evolutions. However, it should be noted that the present application is not limited to the following embodiments, but is applicable to many other wireless communication systems, such as a communication system after 5G, a 4G mobile communication system before 5G, and the like.

Some terms related to the present application are described below, and unless otherwise specified, the terms related to the present application are defined herein. The terms given in the present application may be named differently in LTE, LTE-Advanced Pro, NR and subsequent communication systems, but the present application uses unified terms, which when applied to a specific system may be replaced by terms used in the corresponding system.

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

LTE: long Term Evolution Long term evolution technology

NR: new Radio, 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

eNB: evolutiond NodeB, evolved node B

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 OFDM with cyclic prefix

C-RNTI: cell Radio Network Temporary Identifier cell radio network temporary identity

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 signals

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, configured scheduling Grant

Sidelink: sidestream communication

SCI: sidelink Control Information, sidestream traffic control information

PSCCH: physical Sidelink Control Channel physical sidelink communication control channel

MCS: modulation and Coding Scheme modulation coding scheme

RB: resource Block, resource Block

RE: resource Element, resource unit

CRB: common Resource Block common resource block

CP: cyclic Prefix

PRB: physical Resource Block physical resource blocks

PSSCH: physical Sidelink Shared Channel physical sidelink communication shared channel

FDM: frequency Division Multiplexing frequency division multiplexing

RRC: radio Resource Control radio resource control

RSRP: reference Signal Receiving Power reference signal received power

SRS: sounding Reference Signal sounding reference signal

DMRS: demodulation Reference Signal demodulation reference signal

CRC: cyclic Redundancy Check cyclic redundancy check

PSDCH: physical Sidelink Discovery Channel physical sidelink discovery channel

PSBCH: physical Sidelink Broadcast Channel physical sidelink communication broadcast channel

SFI: slot Format Indication time slot format indication

TDD: time Division Duplexing time division duplexing

FDD: frequency Division Duplexing frequency division duplexing

SIB1: svstem Information Block Type 1, system information Block type 1

SLSS: sidelink synchronization Signal sidestream communication synchronization signal

PSSS: primary Sidelink Synchronization Signal master synchronizing signal for side communication

SSSS: secondary Sidelink Synchronization Signal side-row communication auxiliary synchronization signal

PCI: physical Cell ID, physical Cell identity

PSS: primary Synchronization Signal master synchronization signal

SSS: secondary Synchronization Signal auxiliary synchronization signal

BWP: bandwidth Part, bandWidth segment/section

And (3) GNSS: global Navigation Satellite System Global navigation satellite positioning System

SFN: svstem Frame Number System (radio) 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 connectivity

MCG: master Cell Group master cell group

SCG: secondary Cell Group group of secondary cells

PCell: primary Cell, primary 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, upstream 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

16/64/256QAM: 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 (Domain)

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

ARFCN: absolute Radio Frequency Channel Number absolute radio frequency channel numbering

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

MAC: medium Access Control media access control layer

DRX: discontinuous Reception discontinuous reception

The following is a description of the prior art in connection with the inventive arrangements. Unless otherwise indicated, the terms used in the description of the embodiments are the same as those used in the prior art.

It is worth noting that V2X referred to in the present specification has the same meaning as sidelink. V2X herein may also represent sidelink; similarly, the sidelink herein may also represent V2X, and is not specifically distinguished or limited hereinafter.

The resource allocation method of V2X (sidelink) communication and the transmission mode of V2X (sidelink) communication in the specification of the present application can be replaced equivalently. The resource allocation pattern referred to in the specification may represent a transmission mode, and the referred transmission mode may represent a resource allocation pattern. In NR side row communication, transmission mode 1 indicates a transmission mode (resource allocation scheme) based on base station scheduling; transmission mode2 represents a transmission mode (resource allocation scheme) based on user equipment awareness (sensing) and resource selection.

The PSCCH in the description of the application is used to carry SCI. The PSCCH referred to in the description of this application corresponds to, or is related to, or the scheduled PSCCH is expressed in the same meaning, and is expressed as either an associated PSCCH or corresponding PSSCH. Similarly, reference to a PSSCH in the specification to either, or, respectively, to an associated SCI (including both the first level SCI and the second level SCI) means the same meaning, and either the associated SCI or corresponding SCI. It is worth noting that the first stage SCI is called 1st stage SCI or SCI format 1-A, transmitted in PSCCH; the second level SCI is called 2nd stage SCI or SCI format 2-A (or SCI format 2-B), transmitted in the resources of the corresponding PSSCH.

In NR (comprising NR sidlink) Parameter set (numerology) and NR (including NR sidelink) Slot

The parameter set numerology contains both meanings of subcarrier spacing and cyclic prefix CP length. Wherein NR supports 5 subcarrier spacings of 15k,30k,60k,120k,240khz (corresponding to μ=0, 1,2,3, 4), table 4.2-1 shows the supported transmission parameter sets, as specifically shown below.

Table 4.2-1 NR Supported subcarrier spacing

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

Extended (Extended) CP is supported only when μ=2, i.e., in the case of 60kHz subcarrier spacing, and other subcarrier spacing cases support only normal CP. For 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=1 ms; μ=1, i.e. 30kHz subcarrier spacing, 1 slot=0.5 ms; μ=2, i.e. 60kHz subcarrier spacing, 1 slot=0.25 ms, and so on.

NR and LTE have the same definition for a subframe (subframe), representing 1ms. For a subcarrier spacing configuration μ, slot numbers within 1 subframe (1 ms) may be expressed asIn the range of 0 to->The slot number within 1 system frame (frame, duration 10 ms) can be expressed as +.>In the range of 0 to->Wherein (1)>Andthe definition of the case of different subcarrier spacings μ is shown in the table below.

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

Table 4.3.2-2: the number of symbols per slot, the number of slots per system frame, the number of slots per subframe when CP is extended (60 kHz)

On the NR carrier, the numbered SFN range of system frames (or simply frames) is 0 to 1023. The concept of direct system frame number DFN is introduced in sidestream communication, the numbering range is also 0 to 1023, the description of the relationship between system frames and numerology above is equally applicable to direct system frames, e.g., one direct system frame is also equal to 10ms in duration, one direct system frame includes 10 slots for 15kHz subcarrier spacing, etc. The DFN is applied to timing on the sidelink carrier.

Parameter sets in LTE (including LTE V2X) and slots and subframes in LTE (including LTE V2X)

LTE only supports a subcarrier spacing of 15 kHz. Extended (Extended) CPs are supported in LTE, as are normal CPs. The subframe duration is 1ms, and comprises two slots, each slot being 0.5ms.

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

Resource block RB and resource element RE

Resource blocks RBs are defined in the frequency domain asThe RB is 180kHz in the frequency domain for a contiguous subcarrier, e.g., for a subcarrier spacing of 15 kHz. For a subcarrier spacing of 15kHz x 2 mu, the resource element RE represents 1 subcarrier in the frequency domain and 1 OFDM symbol in the time domain.

SiScenes of unlink communications

1) network-Coverage-free (Out-of-Coverage) side line communication: both UEs conducting sidelink communications have no network coverage (e.g., a UE cannot detect any cell meeting the "cell selection criterion" on the frequency at which sidelink communications are required, meaning that the UE has no network coverage).

2) There is network Coverage (In-Coverage) side line communication: both UEs conducting the sidelink communication have network coverage (e.g., a UE detecting at least one cell meeting the "cell selection criteria" on the frequency at which the sidelink communication is desired indicates that the UE has network coverage).

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

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

Basic procedure for LTE V2X (sidelink) communication

Fig. 1 is a schematic diagram illustrating LTE V2X UE side-by-side communication. First, UE1 transmits side communication control information (SCI format 1) to UE2, and the information is carried on a physical layer channel PSCCH. SCI format 1 contains scheduling information of the PSSCH, for example, frequency domain resources of the PSSCH. Next, UE1 transmits sidelink communication data to UE2, carried by the physical layer channel PSSCH. The PSCCH and corresponding pscsch are frequency division multiplexed, i.e., the PSCCH and corresponding pscsch are located on the same subframe in the time domain and on different RBs in the frequency domain. In LTE V2X, one transport block TB may contain only one initial transmission, or one initial transmission and one blind retransmission (blind retransmission, representing a retransmission not based on HARQ feedback).

The specific design modes 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 scrambling sequence is initialized with a predefined value 510. The PSCCH may carry SCI format 1, where SCI format 1 includes at least frequency domain resource information of the PSCCH. For example, for the frequency domain resource indication field, SCI format 1 indicates the starting sub-channel number and the number of consecutive sub-channels of the PSSCH corresponding to the PSCCH.

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

Resource allocation mode Transmission Mode 3/4 of LTE V2X

Fig. 2 shows two resource allocation schemes of LTE V2X, which are called base station scheduling-based resource allocation (Transmission Mode) and UE aware (serving) -based resource allocation (Transmission Mode), respectively. In the NR side communication, a transmission mode 3 of LTE V2X corresponds to a transmission mode 1 in NR V2X and is a transmission mode based on base station scheduling; the transmission mode 4 of LTE V2X corresponds to the transmission mode2 in NR V2X, and is a transmission mode based on UE awareness. In LTE V2X, when there is eNB network coverage, the base station may configure the resource allocation manner of the UE, or the transmission mode of the UE, through UE-level dedicated RRC signaling (dedicated RRC signaling) SL-V2X-ConfigDedicated, specifically:

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

Specifically, when RRC signaling SL-V2X-ConfigDedimded is set to scheduled-r14, this means that the UE is configured to be based on the transmission mode of the base station schedule. The base station configures the SL-V-RNTI or SL-SPS-V-RNTI through RRC signaling, and transmits an uplink scheduling grant UL grant to the UE through PDCCH or EPDCCH (DCI format 5A, CRC scrambled with SL-V-RNTI or scrambled with SL-SPS-V-RNTI). The uplink scheduling grant UL grant at least includes scheduling information of PSSCH frequency domain resources in the sidelink communication. When the UE successfully monitors PDCCH or EPDCCH scrambled by SL-V-RNTI or SL-SPS-V-RNTI, the PSSCH frequency domain resource indication domain in the uplink scheduling grant UL grant (DCI format 5A) is used as indication information of the frequency domain resource of PSSCH in PSCCH (SCI format 1), and PSCCH (SCI format 1) and corresponding PSSCH are sent.

For semi-persistent scheduling SPS in transmission mode 3, the UE receives the 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 resource of the PSSCH according to the indication information in the DCI format 5A, and determines the time domain resource of the PSSCH (transmission subframe of the PSSCH) according to the information such as subframe n.

2) UE aware (serving) based resource allocation scheme (Transmission Mode 4): the UE-based serving resource allocation approach represents a procedure in which resources for sidelink communication are based on the UE's perception of a candidate set of available resources (serving). The RRC signaling SL-V2X-configdediated set to UE-Selected-r14 indicates that the UE is configured to be UE-based transmitting mode. In the UE-based transmission mode, the base station configures an available transmission resource pool, and the UE determines a sidelink transmission resource of the PSSCH in the transmission resource pool (resource pool) according to a certain rule (for a detailed description of a procedure, see LTE V2X UE-based transmission procedure part), and transmits the PSCCH (SCI format 1) and the corresponding PSSCH.

Sidestream communication resource pool (sidelink resource pool)

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

Resource allocation mode based on (partial) perception

For the resource allocation mode based on (partial) perception, the side communication user equipment selects candidate resources in a time window, determines candidate resources overlapped with the reserved resources according to reserved resources indicated by PSCCH sent by other user equipment in a monitoring time slot, and excludes the overlapped candidate resources (include). The physical layer reports the set of candidate resources that are not excluded to the MAC layer, which selects transmission resources for the PSSCH/PSCCH. The set of transmission resources selected by the MAC layer is referred to as a selected sidelink communication schedule grant (selected sidelink grant).

The perceived-based resource allocation manner (full transmission) indicates that the set of time slots monitored by the user equipment is consecutive time slots in a monitoring window (transmission window).

The partial sensing based resource allocation scheme (partial sensing) includes two parts, namely periodic-based partial sensing (based partial sensing, PBPS) and continuous time slot based partial sensing (contiguous partial sensing). The PBPS indicates that each candidate time slot corresponds to one or more periodic monitoring time slots; CPS means continuous listening of time slots within a specific listening window.

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

In a perceived (or partially perceived) based resource allocation approach, the higher layer requests or triggers the physical layer to determine the resources (perceived or partially perceived) for the PSSCH/PSCCH transmission on slot n. The resource selection window is defined as [ n+T1, n+T2 ]]I.e. the user equipment selects transmission resources within the window. Wherein T1 satisfies the conditionThe choice of T1 depends on the implementation of the user equipment; the RRC configuration information includes a configuration list sl-Selection WindowList of the resource selection window, where the list corresponds to a given priority prio _TX The element (priority of transmission PSSCH) is denoted as T _2min . If T is _2min Less than the remaining packet delay budget (remaining packet delay budget, abbreviated as remaining PDB), then T2 satisfies condition T _2min T2 +.remaining PDB, the choice of T2 depends on the implementation of the user equipment; otherwise T2 is set to remaining PDB. />Is defined as (mu) _SL Subcarrier spacing parameter indicating sidestream communication, i.e. subcarrier spacing is +.>)：

Table 8.1.4-2：Is of the value of (2)

Table 8.1.4-1：Is +.>

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

Example one

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

The method performed by the user equipment according to the first embodiment of the present application will be described in detail with reference to the basic process diagram shown in fig. 3.

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

in step S101, a higher layer (or upper layer) request (or trigger) side-row communication user equipment (physical layer) determines a subset of resources for PSSCH/PSCCH transmission.

Wherein the higher layer selects side row communication resources for PSSCH/PSCCH transmission in the subset of resources.

Optionally, the user equipment performs periodic-based partial awareness (periodic-based partial sensing) when at least the following condition is satisfied:

condition one: optionally, the higher layer configures the resource allocation mode of the user equipment to be a resource allocation mode based on partial sensing (partial sending);

condition II: optionally, the periodic reservation of resources for another transport block in the resource pool is configured (or preconfigured) as enabled, i.e. the RRC cell sl-multiReserve resource is configured as "enabled";

and (3) a third condition: optionally, the resource allocation manner of the resource pool configuration (or pre-configuration) includes a partial sensing-based resource allocation manner (partial sending).

In step S102, the sidelink communication user equipment determines a candidate set of slots (candidates).

Optionally, the manner in which the user equipment determines the set of candidate time slots is dependent on the implementation of the user equipment (up to UE implementation).

In step S103, the sidestream communication user device determines a listening slot set.

Wherein, optionally, when the user equipment performs periodic-based partial awareness (periodic-based partial sensing), the user equipment usesThe monitoring time slot set of the user equipment is as followsWherein (1)>Representing (any) one time slot in the candidate set of time slots. For P _reserve When a listening period list is configured in the resource pool (a periodic sensing reservation periodic list is configured), P _reserve Corresponding to the period in the list, optionally, the '0ms' is removed, or P _reserve Corresponding to a non-zero period in the list; otherwise, P _reserve For all periods in a resource reservation period list (sl-resource reservation period list) configured in the resource pool, optionally, excluding '0ms', or, P _reserve Corresponding to all non-zero periods in the sl-resourceReserve period list. For k, if no additional periodic listening slots (additionalperiodic sensing slots) are configured (or preconfigured), then +_>Representing that corresponds to a given P _reserve At the moment +.>-a previous most recent periodic listening slot (the most recent periodic sensing occasion); otherwise the first set of parameters is selected,representing that corresponds to a given P _reserve At the moment +.>A previous most recent periodic listening slot (the most recent periodic sensing occasion) and a last periodic listening slot preceding the most recent periodic listening slot. Wherein (1)>Representing the first time slot in the time domain in the candidate set of time slots.

Example two

In a second embodiment of the present application, the steps performed by the ue include:

Wherein, optionally, when the user equipment performs periodic-based partial sensing (periodic-based partial sensing), the user equipment listens to the time slot set asWherein (1)>Representing (any) one time slot in the candidate set of time slots. />Wherein T' _max Indicating the number of slots belonging to said resource pool within 10240ms (SFN/DFN 0-1023). For P _reserve When a listening period list is configured in the resource pool (a periodic sensing reservation periodic list is configured), P _reserve Corresponding to the period in the list, optionally, the '0ms' is removed, or P _reserve Corresponding to a non-zero period in the list; otherwise, P _reserve For all periods in a resource reservation period list (sl-resource reservation period list) configured in the resource pool, optionally, excluding '0ms', or, P _reserve Corresponding to all non-zero periods in the sl-resourceReserve period list. For k, if no additional periodic listening slots (additionalperiodic sensing slots) are configured (or preconfigured), then +_>Representing that corresponds to a given P _reserve At the moment +.>-a previous most recent periodic listening slot (the most recent periodic sensing occasion); otherwise, go (L)>Representing that corresponds to a given P _reserve At the moment +.>A previous most recent periodic listening slot (the most recent periodic sensing occasion) and a last periodic listening slot preceding the most recent periodic listening slot. Wherein, />representing the first time slot in the time domain in the candidate set of time slots.

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

The method and the apparatus involved of the present application have been described above in connection with preferred embodiments. It will be appreciated by those skilled in the art that the methods shown above are merely exemplary and that the embodiments described above can be combined with one another without contradiction. The method of the present application is not limited to the steps and sequences shown above. The network nodes and user equipment shown above may comprise further modules, e.g. modules that may be developed or developed in the future that may be used for a base station, MME, or UE, etc. The various identifiers shown above are merely exemplary and are not intended to be limiting, and the present application is not limited to the specific cells that are examples of such identifiers. Many variations and modifications may be made by one of ordinary skill in the art in light of the teachings of the illustrated embodiments.

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

In the present application, the "base station" may refer to a mobile communication data and control switching center with a larger transmitting power and a wider coverage area, including functions of resource allocation scheduling, data receiving and transmitting, etc. "user equipment" may refer to user mobile terminals including, for example, mobile phones, notebooks, etc., that may communicate wirelessly with a base station or micro base station.

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

Furthermore, each functional module or each feature of the base station apparatus and the terminal apparatus used in each of the above embodiments may be implemented or performed by a circuit, which is typically one or more integrated circuits. Circuits designed to perform the functions described in this specification may include a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC) or a general purpose integrated circuit, a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, or discrete hardware components, or any combination thereof. A general purpose processor may be a microprocessor, or the processor may be an existing processor, controller, microcontroller, or state machine. The or each circuit may be configured by digital circuitry or may be configured by logic circuitry. In addition, when advanced technologies capable of replacing the current integrated circuits are presented due to advances in semiconductor technology, the present application can also use integrated circuits obtained using the advanced technologies.

While the application has been shown above in connection with the preferred embodiments thereof, it will be understood by those skilled in the art that various modifications, substitutions and changes may be made thereto without departing from the spirit and scope of the application. Accordingly, the application should not be limited by the above-described embodiments, but by the following claims and their equivalents.

Claims

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

requesting or triggering the user equipment by a higher layer to determine a resource subset used for PSSCH/PSCCH transmission, wherein the higher layer selects side row communication resources used for the PSSCH/PSCCH transmission in the resource subset;

the user equipment determines a candidate time slot set; and

the user equipment determines a set of listening slots.

2. The method of claim 1, wherein the step of determining the position of the substrate comprises,

the user equipment performs period-based partial awareness in case at least the following condition is fulfilled,

condition one: the higher layer configures the resource allocation mode of the user equipment to be a resource allocation mode based on the partial perception; and/or

Condition II: periodically reserving a resource configuration or pre-configuring to be enabled for another transmission block in a resource pool; and/or

And (3) a third condition: the resource pool configuration or the pre-configured resource allocation mode comprises a resource allocation mode based on the partial perception.

3. The method of claim 1, wherein the step of determining the position of the substrate comprises,

the manner in which the user equipment determines the set of candidate time slots is dependent on the implementation of the user equipment.

4. A method according to any one of claims 1 to 3, wherein,

in case the user equipment performs the period-based partial awareness, the user equipment listening time slot set is

Wherein,

represents any slot in the set of candidate slots,

for P _reserve P when the resource pool is configured with a monitoring period list _reserve Corresponding to a period or a non-zero period in the listening period list; otherwise, P _reserve Corresponding to all periods or all non-zero periods in a list of resource reservation periods configured in the resource pool,

for k, if no additional periodic listening slots are configured or preconfigured, thenRepresenting that corresponds to a given P _rererve At the moment +.>The last previous periodic listening slot; otherwise the first set of parameters is selected,representing that corresponds to a given P _reserve At the moment +.>A previous most recent periodic listening slot and a last periodic listening slot preceding the most recent periodic listening slot, wherein ∈r>Representing the first time slot in the time domain of the candidate set of time slots,/>Representing a first processing delay,/->Representing a second processing delay.

5. A method according to any one of claims 1 to 3, wherein,

Wherein,

represents any slot in the set of candidate slots,

wherein T' _max Indicating the number of time slots belonging to said resource pool within 10240ms,

for P _reserve P when the resource pool is configured with a monitoring period list _reserve Corresponding to a period or a non-zero period in the listening period list; otherwise, P _reserve Corresponding to the resources configured in the resource poolAll periods or all non-zero periods in the source reservation period list,

for k, if no additional periodic listening slots are configured or preconfigured, thenRepresenting that corresponds to a given P _reserve At the moment +.>The last previous periodic listening slot; otherwise the first set of parameters is selected,representing that corresponds to a given P _reserve At the moment +.>A previous most recent periodic listening slot and a last periodic listening slot preceding the most recent periodic listening slot, wherein ∈r>Representing the first time slot in the time domain of the candidate set of time slots,/>Representing a first processing delay,/->Representing a second processing delay.

6. A user equipment, comprising:

a processor; and

a memory storing instructions;

wherein the instructions, when executed by the processor, perform the method according to any one of claims 1 to 5.