CN115884123A

CN115884123A - Method performed by user equipment and user equipment

Info

Publication number: CN115884123A
Application number: CN202111147604.5A
Authority: CN
Inventors: 赵毅男; 罗超; 刘仁茂
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2021-09-28
Filing date: 2021-09-28
Publication date: 2023-03-31
Also published as: WO2023051452A1

Abstract

The invention provides a method executed by user equipment and the user equipment, wherein the method comprises the following steps: selecting a sideline communication time-frequency resource; and receiving a cooperation message between the user equipments; and performing resource reselection on the sideline communication resources indicating resource conflict by the cooperative message.

Description

Method performed by user equipment and user equipment

Technical Field

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

Background

In a conventional cellular network, all communications must pass through the base station. In contrast, device-to-Device communication (Device-to-Device communication) refers to a communication method in which two user equipments directly communicate with each other without forwarding through a base station or a core network. A research topic on implementing an approaching D2D communication service with LTE devices was approved at RAN #63 congress of 3rd Generation Partnership project (3 gpp) in 2014, 3 month (see non-patent document 1). Functions introduced by LTE Release 12 d include:

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

2) A Broadcast communication (Broadcast) function between adjacent devices;

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

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

1) D2D discovery of non-network coverage scenarios and partial network coverage scenarios;

2) Priority handling mechanism for D2D communication.

Based on the design of D2D communication mechanism, the V2X feasibility study topic based on D2D communication was approved at 3GPP RAN #68 second-time congress of 2015, 6 months. V2X represents Vehicle to evolution, and the Vehicle and all entity information interaction which possibly influences the Vehicle are expected to be realized, so that accidents are reduced, traffic jam is relieved, environmental pollution is reduced, and other information services are provided. The application scenario of V2X mainly includes 4 aspects:

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

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

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

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

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

1) Higher density DMRS to support high speed scenarios;

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

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

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

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

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

Approval was obtained on the basis of the standardized research topic (see non-patent document 6) of NR sidelink enhancement that has been standardized at the full meeting of 3gpp ran #90e, 12/2020. The enhancement of the sideline communication comprises the following three aspects:

1) Resource allocation for standardized reduction of power consumption (power saving) of a communication user equipment includes, but is not limited to: a resource allocation mode based on partial sensing and a resource allocation mode based on random resource selection;

2) Research on improving the communication reliability of the resource allocation mode 2 in NR side-row communication and reducing the communication delay of the resource allocation mode 2 includes: inter-UE coordination between UEs. And UE (user equipment) cooperative representation: UE a determines one resource set and sends (indicates) the resource set to UE B. The resource allocation mode of the UE B is a resource allocation mode 2, and the resource set indicated by the UE A is taken into account in the resource selection;

3) A standardized SL Discontinuous Reception (SL DRX) mechanism. In 5G NR communication, the ue supports discontinuous reception of the PDCCH, referred to as DRX, over time, which can effectively reduce power consumption of the communication device. Similarly, corresponding to SL DRX, discontinuous reception refers to receiving the physical sidelink communication control channel PSCCH for a portion of time in the time domain, referred to as the Active time (Active time); the time when the PSCCH is not received is called an inactive period (In-active time).

In the 3gpp ran1#104bis-e conference at 4 months at 2021, the following conclusion is reached regarding Inter-UE coordination in mode 2 under the resource allocation scheme 2 (see non-patent document 7):

the UE supports the following two schemes in cooperation:

UE coordination scheme one: the cooperation message sent by UE a to UE B is an indication of the set of resources. The set of resources is preferred resources for UE B transmissions (predicted for UE B's transmissions) and/or non-preferred resources for UE B transmissions (non-predicted for UE B's transmissions);

the second coordination scheme between UEs: the coordination message sent by UE a to UE B indicates that there is an expected (or potential) resource conflict (resource conflict) on the resource indicated by the SCI sent by UE B, and/or indicates that there is a detected (detected) resource conflict (resource conflict) on the resource indicated by the SCI sent by UE B.

The scheme of the present patent includes a method for selecting resources by a user equipment B in a resource allocation mode 2 in a scheme two of cooperation between UEs, and a method for reselecting resources by a user equipment B for resources with conflicts when the user equipment a indicates that the resources conflict.

Documents of the prior art

Non-patent document

Non-patent document 1: RP-140518, work item proxy on LTE Device to Device Proximity Services

Non-patent document 2: RP-142311, work Item Proposal for Enhanced LTE Device to Device Proximity Services

Non-patent document 3: RP-152293, new WI propofol: support for V2V services based on LTE sidelink

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

Non-patent document 5: RP-181480, new SID Proposal: study on NR V2X

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

Non-patent document 7: RAN1#104bis-e, chairman's nodes, section 8.11.1.2

Disclosure of Invention

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

According to a first aspect of the invention, comprising: selecting a sideline communication time-frequency resource; and receiving a cooperation message between the user equipments; and performing resource reselection on the sideline communication resources indicating resource conflict by the cooperative message.

According to the method of the first aspect of the present invention, the selected sideline communication time-frequency resource at least meets the condition: and ensuring the minimum time interval between any two of the time-frequency resources. The minimum time interval includes: a first time interval and a second time interval.

According to the method of the first aspect of the present invention, the first time interval represents a time interval between a psch transmission on a second resource in a time domain of the two arbitrary resources and a channel resource associated with the psch transmission for transmitting a cooperation message between UEs.

According to the method of the first aspect of the invention, the first time interval is defined by

And a configuration period of the channel for transmitting the cooperation message.

According to the method of the first aspect of the present invention, the time slot in which the channel resource for transmitting the cooperative message is located is before the second resource and is spaced at least by the second resource

Is configured with the most recent slot of channel resources for transmitting the cooperation message.

According to the method of the first aspect of the invention, the second time interval represents a time interval for receiving and processing the cooperation message, plus at least a time of transmission to reception/reception transmission switching.

According to the method of the first aspect of the invention, the coordination message is a resource conflict indication message; and the indication message indicates that there is a resource conflict.

According to the method of the first aspect of the present invention, if the indication message indicates that there is a collision of one or more time-frequency resources, the user equipment deletes the one or more time-frequency resources from the selected sidelink communication scheduling grant.

According to the method of the first aspect of the present invention, the sideline communication time-frequency resource is randomly selected from the sideline communication resources indicated by the physical layer, and the sideline communication time-frequency resource on the time slot where the one or more time-frequency resources are located is not included.

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

The invention has the advantages of

According to the scheme of the patent, in the NR side-line communication enhancement, when the user equipment selects resources, associated channel resources which can be used for sending cooperative messages between the UE exist between any two selected side-line communication resources, and the reliability of the side-line communication resource allocation mode 2 is improved. Meanwhile, when the cooperation message between the UE indicates that resource conflict exists (cooperation scheme II between the UE), the resource reselected by the user equipment is not overlapped with the resource with conflict in the time domain, the phenomenon that the sidestream communication user equipment cannot receive sidestream communication transmission on the reselected resource is avoided, and the reliability of sidestream communication is effectively improved.

Drawings

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

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

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

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

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

Detailed Description

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

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

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

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

LTE: long Term Evolution, long Term Evolution technology

NR: new Radio, new Wireless, new air interface

PDCCH: physical Downlink Control Channel, physical Downlink Control Channel

DCI: downlink Control Information, downlink Control Information

PDSCH: physical Downlink Shared Channel (pdcch)

UE: user Equipment, user Equipment

eNB: evolved NodeB, evolved node B

And g NB: NR base station

TTI: transmission Time Interval, transmission Time Interval

OFDM: orthogonal Frequency Division Multiplexing, orthogonal Frequency Division Multiplexing

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

C-RNTI: cell Radio Network Temporary Identifier

CSI: channel State Information, channel State Information

HARQ: hybrid Automatic Repeat Request

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

CRS: cell Reference Signal, cell specific Reference Signal

PUCCH: physical Uplink Control Channel, physical Uplink Control Channel

PUSCH: physical Uplink Shared Channel, physical Uplink Shared Channel

UL-SCH: uplink Shared Channel, uplink Shared Channel

CG: configured Grant, configuring scheduling Grant

Sidelink: sidelink communications

SCI: sidelink Control Information, sidelink communication Control Information

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

MCS (modulation and coding scheme): modulation and Coding Scheme, modulation and Coding Scheme

RB: resource Block, resource Block

RE: resource Element, resource Element

CRB: common Resource Block, common Resource Block

And (3) CP: cyclic Prefix, cyclic Prefix

PRB: physical Resource Block, physical Resource Block

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

FDM: frequency Division Multiplexing, frequency Division Multiplexing

RRC: radio Resource Control, radio Resource Control

RSRP: reference Signal Receiving Power, reference Signal Receiving Power

SRS: sounding Reference Signal, sounding Reference Signal

DMRS: demodulation Reference Signal (DMRS)

CRC: cyclic Redundancy Check (crc)

PSDCH: physical Sidelink Discovery Channel

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

SFI: slot Format Indication

TDD: time Division Duplexing

FDD: frequency Division Duplexing

And (3) SIBl: system Information Block Type 1, system Information Block Type 1

SLSS: sidelink synchronization Signal, sidelink communication synchronization Signal

PSSS: primary Synchronization Signal, primary sideline communication Signal

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

PCI: physical Cell ID, physical Cell identity

PSS: primary Synchronization Signal, primary Synchronization Signal

SSS: secondary Synchronization Signal, secondary Synchronization Signal

BWP: bandwidth Part, bandWidth fragment/Part

GNSS: global Navigation Satellite positioning System (GNSS)

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

DFN: direct Frame Number, direct Frame Number

IE: information Element, information Element

And (2) SSB: synchronization Signal Block, synchronous System information Block

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

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

SCG: secondary Cell Group, secondary Cell Group

PCell: primary Cell, primary Cell

SCell: secondary Cell, secondary Cell

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

SPS: semi-persistent Scheduling, semi-persistent Scheduling

TA: timing Advance, uplink Timing Advance

PT-RS: phase-Tracking Referencc Signals

TB: transport Block

CB: code Block, code Block/Code Block

QPSK: quadrature Phase Shift Keying (QPSK)

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

AGC: auto Gain Control, automatic Gain Control

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

FDRA (field): frequency Domain Resource Assignment, frequency Domain Resource Assignment indication (Domain)

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

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

MAC: medium Access Control, media Access Control layer

DRX: discontinuous Reception, discontinuous Reception

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

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

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

The PSCCH in the description of the present invention is used to carry SCI. The PSCCH referred to in the description of the present invention is referred to as corresponding PSCCH, or related PSCCH, or scheduled PSCCH, which all have the same meaning and all represent either an associated PSCCH or a associated PSCCH. Similarly, PSSCH references in the specification refer to corresponding, or related SCIs (including first-level SCI and second-level SCI) as having the same meaning, and all refer to associated SCI or associated SCI. It is noted that the first-level SCI, referred to as 1st stage SCI or SCI format 1-A, is transmitted in the PSCCH; the second level SCI is called 2nd stage SCI or SCI format 2-A (or SCI format 2-B), and is transmitted in the resource of the corresponding PSSCH.

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

Parameter set numerology includes both subcarrier spacing and cyclic prefix CP length implications. Where NR supports 5 sub-carrier spacings, 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 shown below.

TABLE 4.2-1 NR supported subcarrier spacing

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

Extended (Extended) CP is supported only in case of μ =2, i.e., 60kHz subcarrier spacing, and only normal CP is supported in case of other subcarrier spacing. For Normal (Normal) CP, each slot (slot) contains 14 OFDM symbols; for extended CP, each slot contains 12 OFDM symbols. For 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 for a subframe (subframe), indicating 1ms. For subcarrier spacing configuration μ, the slot number within 1 subframe (1 ms) may be expressed as

Ranges from 0 to->

A slot number in 1 system frame (frame, duration 10 ms) can be expressed as +>

Ranges from 0 to->

Wherein the content of the first and second substances,/>

and

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

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

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

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

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

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

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

Resource block RB and resource element RE

The resource block RB is defined as in the frequency domain

The RB is 180kHz in the frequency domain for a contiguous number of subcarriers, e.g., 15kHz subcarrier spacing. For subcarrier spacing 15kHz 2 ^μ The resource element RE represents 1 subcarrier in the frequency domain and 1 OFDM symbol in the time domain.

Scenarios for Sidelink communications

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

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

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

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

Basic procedure for LTE V2X (sidelink) communication

Fig. 1 is a schematic diagram illustrating LTE V2X UE sidelink communications. First, UE1 transmits sidelink communications control information (SCI format 1) carried by the physical layer channel PSCCH to UE 2. SCI format 1 includes scheduling information of the pscch, such as frequency domain resources of the pscch. Then, UE1 transmits sidelink communication data to UE2, which is carried by a physical layer channel pscch. The PSCCH and the corresponding PSCCH are frequency division multiplexed, that is, the PSCCH and the corresponding PSCCH are located on the same subframe in the time domain and are located on different RBs in the frequency domain. In LTE V2X, a transport block TB may contain only one initial transmission, or one initial transmission and one blind retransmission (indicating a retransmission not based on HARQ feedback).

The specific design modes of the PSCCH and the PSSCH are as follows:

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

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

LTE V2X resource allocation Mode 3/4

Fig. 2 shows two resource allocation schemes of LTE V2X, which are respectively referred to as resource allocation based on base station scheduling (Transmission Mode 3) and resource allocation based on UE sensing (sensing) (Transmission Mode 4). In NR side-row communication, transmission mode 3 of LTE V2X corresponds to transmission mode 1 in NR V2X, which is a transmission mode based on base station scheduling; transmission mode4 of LTE V2X corresponds to transmission mode 2 in NR V2X, which is a UE-aware based transmission mode. In LTE V2X, when there is eNB network coverage, a base station may configure a resource allocation manner of a UE, or referred to as a transmission mode of the UE, through UE-level dedicated RRC signaling (dedicated RRC signaling) SL-V2X-ConfigDedicated, specifically:

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

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

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

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

Side communication resource pool (sidelink resource pool)

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

Resource allocation based on (partial) perception

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

A resource allocation mode based on sensing (transmitting) is called a resource allocation mode 2, and means that the user equipment monitors PSCCH transmitted by other side-line communication user equipment on all time slots except all time slots transmitted by the user equipment; for the resource allocation based on partial sensing (partial sensing), the ue only listens to PSCCHs transmitted by other ues in a partial timeslot in the time domain.

Resource selection window n + T1, n +T2]

In a sensing (or partially sensing) based resource allocation approach, the higher layer requests or triggers the physical layer to determine (sense or partially sense) resources for PSCCH/PSCCH transmission at time 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 condition

The choice of T1 depends on the implementation of the user equipment; the RRC configuration information comprises a configuration list sl-Selection WindowList of resource Selection windows, wherein the list corresponds to a given priority prio _TX The element of (priority of transmitting PSSCH) is denoted T _2min . If the T is _2min Less than the remaining packet delay budget (referred to as remaining PDB), then T2 satisfies the condition T _2min T2 ≦ remaining PDB, T2 selection depending on user equipment implementation; otherwise, T2 is set to remaining PDB. />

Is defined as follows (. Mu.) _SL A subcarrier spacing parameter indicating a sideline communication, i.e. a subcarrier spacing of ≥ h>

)：

Table 8.1.4-2：

Value of (a)

Table 8.1.4-1：

Is taken on>

User equipment determines number of logical slots (logical slots)

The logical time slot referred to in the description of the present invention represents a time slot included in a sidelink communication resource pool. For a time duration (or, number of slots), the corresponding (converted) logical slot number is calculated by the following formula:

wherein, T' _max Indicates the number of logical slots of a resource pool in 10240ms corresponding to SFN (or DFN) 0-1023; p is _interval Representing a time length of, for example, 1ms, or, alternatively, 3 time slots (subcarrier spacing of 15kHz, i.e., 3 ms); p' _interval Represents P _interval The number of corresponding (converted) logical slots. For example,

the number of corresponding logical time slots equals &>

Inter-UE coordination

The UE supports the following two schemes in cooperation:

coordination scheme one between UEs: the coordination message sent by UE a to UE B is an indication of the set of resources. The set of resources is preferred resources for UE B transmissions (predicted for UE B's transmissions) and/or non-preferred resources for UE B transmissions (non-predicted for UE B's transmissions);

In the description of the present invention, UE a that transmits a cooperation message and UE B that receives a cooperation message are both referred to as sidelink user equipment.

Channel resources for cooperative messages

The channel resources of the cooperation message corresponding to the cooperation scheme two between the UEs are optionally configured (or preconfigured) periodically in the time domain. The reserved sidelink communication resource (psch) of the user equipment is associated (association) or corresponds (association) to a channel resource of a cooperation message. The channel resource may be preceded in time domain by its associated sidelink communication resource (pscch), which is not limited in any way by the present invention.

Embodiments of the present invention each configure (or pre-configure) channel resources for transmitting a coordination message (resource collision indication) in a sidestream communication resource pool (or a sidestream communication bandwidth segment SL BWP).

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

[ example one ]

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

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

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

in step S101, optionally, the sidestream communication user equipment selects a sidestream communication time-frequency resource.

Optionally, the user equipment selects a sideline communication time-frequency resource, which at least meets the following conditions: ensuring any two of the time frequency resourcesA minimum time interval in between (i.e., the time interval between any two of the time-frequency resources is not less than the minimum time interval). Wherein, optionally, the minimum time interval comprises: a first time interval; optionally, the first time interval represents a time interval between a psch transmission on a second (latter) resource in a time domain of the two arbitrary resources and a channel resource associated with the psch transmission (corresponding correlation) for transmitting a cooperation message between UEs. Optionally, the first time interval is determined by

(or, is selected based on the status of the blood pressure sensor>

Or

) And/or a configuration (or pre-configuration) period of the channel for transmitting the cooperation message. Optionally, the channel resource for transmission of the cooperative message is in a time slot preceding the second (following) resource and separated by at least +>

(or, is selected based on the status of the blood pressure sensor>

Or (R)>

) The most recent configuration (or pre-configuration) of (or is) time slots of channel resources for transmitting the cooperation message. Optionally, the->

(or, is selected based on the status of the blood pressure sensor>

Or

) Corresponding to the number of logical slots in the resource pool.

And/or, a second time interval; wherein optionally said second time interval represents a time interval for receiving and processing (processing) a coordination message, and/or (plus) at least including a time to transmit to receive/receive to transmit switch.

In step S102, optionally, the user equipment receives the collaboration message.

Optionally, the ue receives the cooperative message on the timeslot where the channel resource is located.

Optionally, the coordination message is a resource conflict indication message, and optionally, the indication message indicates that there is a resource conflict.

In step S103, optionally, the ue performs resource reselection.

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

Wherein, optionally, if the indication message indicates that there is a conflict in one (or more) time-frequency resources, the user equipment optionally deletes the one (or more) time-frequency resources from the selected sidelink communication scheduling grant (selected sidelink grant);

and, optionally, the user equipment randomly selects a sidelink communication time-frequency resource from the sidelink communication resources (indicated by the physical layer). Optionally, the ue randomly selects a sidelink communication time-frequency resource from sidelink communication resources (indicated by the physical layer), and excludes (or excludes) the sidelink communication time-frequency resource on the timeslot where the (or the plurality of) time-frequency resources are located.

[ example two ]

In a second embodiment of the present invention, the user equipment performs the steps including:

in step one, optionally, the sidestream communication user equipment selects a sidestream communication time-frequency resource.

Optionally, the user equipment selects a sideline communication time-frequency resource, which at least meets the following conditions: at least a channel resource for transmitting the cooperative message, which is associated with (or corresponds to) the psch transmission on a second (latter) resource in a time domain of the two arbitrary resources, is included between any two of the time-frequency resources. Optionally, the time slot in which the channel resource for transmitting the cooperative message is located is before the second (last) resource and is spaced at least by the second (last) resource

(or,/')>

Or->

(or, is selected based on the status of the blood pressure sensor>

Or

) Corresponding to the number of logical slots in the resource pool.

Optionally, a time interval between a first (previous) resource in a time domain of the any two resources and the channel resource at least includes a reception and processing (processing) cooperative message, and/or (plus) a time interval including at least a time to transmit to receive/receive to transmit switch.

In step two, optionally, the user equipment receives the collaboration message.

In step three, optionally, the user equipment performs resource reselection.

and, optionally, the user equipment randomly selects a sidelink communication time-frequency resource from sidelink communication resources (indicated by a physical layer). Optionally, the ue randomly selects a sidelink communication time-frequency resource from sidelink communication resources (indicated by the physical layer), and excludes (or excludes) the sidelink communication time-frequency resource on the timeslot where the (or the plurality of) time-frequency resources are located.

[ third example ]

In a third embodiment of the present invention, the user equipment performs steps including:

Optionally, the user equipment selects a sidelink communication time-frequency resource, and at least meets the following conditions: a first (previous) resource in a time domain of the any two resources is before a channel resource for transmitting the cooperation message, which is associated with (or corresponds to) a psch transmission in a second (next) resource in a time domain of the any two resources; and/or, optionally, a time interval between a first (previous) resource in a time domain of the any two resources and the channel resource includes at least a reception and processing (processing) cooperative message, and/or (plus), a time interval including at least a time to transmit to receive/receive to transmit switch,

alternatively, the first and second electrodes may be,

a channel resource for transmitting the cooperation message associated with (or corresponding to) psch transmission on a second (latter) of the any two resources in a time domain is subsequent to a first (former) of the any two resources in the time domain; and/or, optionally, a time interval between a first (previous) resource in a time domain of the any two resources and the channel resource includes at least a reception and processing (processing) cooperative message, and/or (plus) a time interval including at least a time of a transmission to reception/reception transmission switch.

Wherein, optionally, the time slot in which the channel resource for transmitting the cooperative message is located is before the second (latter) resource and is spaced at least by the second resource

(or,/')>

Or->

) The most recent configuration (or pre-configuration) of (or is) time slots of channel resources for transmitting the cooperation message. Optionally, said +>

(or,/')>

Or->

) Corresponding to the number of logical slots in the resource pool.

In step two, optionally, the user equipment receives the cooperative message.

In step three, optionally, the user equipment performs resource reselection.

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

and, optionally, the user equipment randomly selects a sidelink communication time-frequency resource from sidelink communication resources (indicated by a physical layer). Optionally, the ue randomly selects a sidelink communication time-frequency resource from the sidelink communication resources (indicated by the physical layer), excluding (or excluding) the sidelink communication time-frequency resource on the timeslot where the (or multiple) time-frequency resource is located.

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

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

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

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

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

Further, each functional block or 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 typically one or more integrated circuits. Circuitry designed to perform the various functions described in this specification may include a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC) or a general purpose integrated circuit, a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, or discrete hardware components, or any combination thereof. A general-purpose processor may be a microprocessor, but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine. The general-purpose processor or each circuit described above may be configured by a digital circuit, or may be configured by a logic circuit. Further, when advanced technology capable of replacing the present integrated circuit has appeared due to the progress of semiconductor technology, the present invention can also use the integrated circuit obtained by using the advanced technology.

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

Claims

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

selecting a sideline communication time-frequency resource; and

receiving a cooperation message between user equipment; and

and performing resource reselection on the sideline communication resources of which the cooperative messages indicate resource conflict.

2. The method of claim 1,

the selected side row communication time frequency resource at least meets the following conditions:

and ensuring the minimum time interval between any two of the time frequency resources. The minimum time interval includes: a first time interval and a second time interval.

3. The method of claim 2,

the first time interval represents a time interval between a psch transmission on a second resource in a time domain of the any two resources and a channel resource associated with the psch transmission for transmission of a cooperation message between UEs.

4. The method of claim 3,

the first time interval is composed of

5. The method of claim 3,

the time slot of the channel resource for transmitting the cooperative message is before the second resource and is at least separated by

Is allocated with the most recent slot of the channel resource for transmitting the cooperation message.

6. The method of claim 2,

the second time interval represents a time interval for receiving and processing the cooperation message, plus at least a time of transmission to reception/reception transmission switching.

7. The method of claim 1,

the cooperative message is a resource conflict indication message; and

the indication message indicates that there is a resource conflict.

8. The method of claim 7,

and if the indication message indicates that one or more time-frequency resources have conflict, the user equipment deletes the one or more time-frequency resources from the selected sidestream communication scheduling permission.

9. The method of claim 8,

and randomly selecting the sideline communication time-frequency resource from the sideline communication resources indicated by the physical layer, wherein the sideline communication time-frequency resource on the time slot where the one or more time-frequency resources are located is not included.

10. A user equipment, comprising:

a processor; and

a memory storing instructions;

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